you should note the following 1 bearing installation should be clean

High-speed precision angular roller bearing manufacturer contact ball bearings , mainly used for high-speed rotating occasions lighter loads , requiring high precision bearings , high speed, low vibration and low temperature rise a certain life . Often high-speed spindle support member installed in pairs , is the inner surface grinding spindle speed key component parts .
The main technical indicators:
1 bearing precision index : Over GB/307.1-94 P4 class precision
2 high-speed performance: dmN value 1.3 ~ 1.8x 106 / min
3 life ( average ):> 1500 h
High-speed precision angular contact ball bearing service life of a great relationship with the installation , you should note the following
1 bearing installation should be clean , clean room for the bearing to be carefully matching, bearing Angular contact ball bearing spacers to go through the grind of maintaining high inner and outer ring spacers under the premise of the spacer should be controlled in parallel 1um the following ;
(2) Before installing the bearings should be cleaned , cleaning the inner slope upward , feel should be flexible , no sense of stagnation , dried , placed in a predetermined amount grease, oil mist lubrication should be placed in the case of a small amount of oil mist ;
3 bearing installation tool should be used exclusively , even by force , is strictly prohibited beat ;
4 bearing deposit should be clean and ventilated , non-corrosive gases, relative humidity less than 65% , long-term storage should be periodically rust.

acting on the radial and axial certain minimum load

In order to ensure satisfactory performance , needle roller / angular contact ball bearings like all ball bearings and roller bearings , must always bear acting on the radial and  Angular contact ball bearing axial certain minimum load , especially if they want to run at high speed or subjected to high accelerations or rapid changes in the load direction . Under these conditions , the rolling element and the inertia force of the retainer and lubricants friction bearing arrangement may play a deleterious effect on the rolling conditions , and may cause the rolling element and the raceway between the sliding destructive .
Increase in radial needle bearing on the necessary minimum radial load can be estimated using the following formula :
Frm = 0.02 C
Angular contact ball bearings necessary Deep groove ball bearing minimum axial load can be calculated using the following formula :
Where
Frm = minimum radial load, kN
Fam = minimum axial load, kN
C = basic dynamic load rating ( see product table ) , kN
C0 = basic static load rating ( see product table ) , kN
dm = bearing mean diameter
= 0,5 (d + D), mm
n = rotational speed, r / min
Cold start or lubricant viscosity is very high, even demanding loads. Bearing weight of the components together with external forces generally exceed the minimum necessary load. If this is not the case, you must give Needle roller / angular contact ball bearings impose additional radial and / or axial loads.

Eventually, they optimize the accuracy, reliability

 SKF system 24 lagd series of single point automatic lubricator is timely and accurate hand solutions for various industries to provide mechanical bearings require lubrication appropriate pre-set amount. The cost-effective, the gas feed drive reliably executed  spherical roller bearing version of the design of a 24-hour basis, without human intervention, it is often difficult to access addresses or potentially dangerous problems associated lubrication points. Eventually, they optimize the accuracy, reliability, and clean oil transportation, lead to asset increase uptime, reduce maintenance, and good environmental impacts. Lubrication compared to continuous control of automatic lubrication of fresh and clean lubricating oil into the supply reduction of potentially harmful contaminants, prevent overheating, waste, and through the lubrication resulting in seal damage slim bearings , excessive wear and eliminates lubrication. The characteristics of the lubricant flexible, the user can assign settings (range 12 months) and visual detection of transparent lubricant container distribution rate. Patented gas cells to produce high-quality distribution of lubricant has been filled with SKF lubrication specially formulated applying appropriate pressure vessel. Custom lubricant fill requirement can also be assessed. Users can also program from the unique SKF dialset benefits (available for free download www.skfusa. Com) to determine the exact calculation of lubricant distribution.lagd Series lubricants offer ready to use in two sizes (60 ml and 125 ml), and integration tool free activation. Various lubrication accessories, including connectors, brushes and non-return valve (oil application), as well as installation and protection devices, can be specified.

Here are SKF bearings distributor in China's detailed report

SKF solutions for racing systemWe know, organized by the FIA Spanish Aragonese Zuera 2010 World Cup tournament champion team is Chiesa Corse racing team, there is SKF's irreplaceable credit, why do I say? Here SKF distributor in China to answer your questions.Chiesa Corse racing team designed and manufactured by the company SKF Cardin axle unit and cylindrical roller thin wall bearings engine solutions for Chiesa Corse racing team provides the best speed, rigidity and emergency response, and to ensure that the car high-speed rotation efficiency and long reliable service life, thus engine SKF bearings for high performance racing gives more adequate power, rigidity and reliability. Here are SKF thin bearings distributor in China's detailed report.SKF solutions for racing system, which is the unit of SKF's racing in karts Chiesa Corse racing team provides customized technology solutions, primarily for racing wheel bearing applications and engines were designed. The device uses the car dust cover unit that allows its bearings under race conditions convenient for cleaning lubrication, thus ensuring the efficiency of racing high-speed rotation, as well as long-term reliable service life.At the same time, SKF car unit of the car rear axle designed for reliable quality shaft mounting and rotating concentric with the real and the low friction ball locking device, thereby providing the best speed, rigidity and response. In addition, a high-performance engine bearings are also racing to give a more ample power, rigidity and reliability. Also located in this race means outer surface and patented groove profile SKF Group is designed to avoid this during the game supporting devices due to the risk of dislocation caused.

This process should consider many factors

Theoretically centrifugal pump service life of rolling bearings NSK 20,000 to 80,000 hours, however, the actual life depends on many factors - NSK Bearings premature failure will lead to consideration of the high equipment downtime, and sometimes even lead more serious consequences. NKE (Austria) company NSK Bearings expert provides some simple but practical NSK Bearings performance optimization techniques.Satisfactory life begins NSK Bearings NSK Bearings correct choice. From the outset, NSK grinding spindle for different applications through designers select the right NSK Bearings NSK Bearings to extend equipment life and performance. This process should consider many factors, such as load, hardness, NSK bearings life prediction, operating environment and so on.Correct storageIn principle, all NSK high precision bearing prior to installation should be kept in their original packaging. They need to stay in a clean, moisture free, relatively constant temperature in the environment. Rolling NSK Bearings should stay away from dust, water and corrosive chemicals. Shaking and vibration may forever destroy the mechanical properties of NSK bearings, so the handling and storage process must avoid vibration.Basically, all levels of NSK bearings have to be saved, because some heavier NSK Bearings long vertically, it may be deformed due to its own weight.Pre-coated with grease (or sealed) NSK bearings need to be careful, because the oil after a long period of storage after the density change. NSK bearings so that when the first time, there will be a certain degree of rotation noise. Thus, the NSK bearings aside time should be controlled according to the FIFO principle.

Hunan Timken Company general manager

Hunan Xiangtan city leaders to guide the work of Timken Company
TIMKEN TIMKEN Thin bearing Company China Limited Hunan Xiangtan municipal leaders 2010.04.30 Tao , deputy inspector of new water Deputy Minister , Office Yuan Xihui City Code , City Code Office deputy researcher Wu Ming and other city leaders to Hunan Xiangtan Timken company guidance . Hunan Timken Company general manager , Mr. James Ai Gete water to guide the work of the new pottery reported Hunan TIMKEN COMPANY , and government leaders attach importance to and guide the company deeply grateful. Xiangtan City , Hunan Leading Tao fresh water to roller bearing the work of Timken Company , said: "The government will be great support from the policy , the working group at any time improve coordination of services , the company provides a good investment environment . Provide good service for the enterprise , and effectively solve problems for them . "
About Timken Company in Hunan : Hunan Timken Bearing Company is the world's largest earlier this year by the United States, one bearing manufacturer Timken Company and Xiangtan Electric Manufacturing Co., Ltd. joint venture , mainly the production of large wind turbine drive spindle Timken bearings , located in Xiangtan high-tech Zone industrial Park in Germany , is the Timken in China 's first six plants. (Timken bearings distributor in China Editor )

I wish you all a Happy New Year floating Enns

  In the past year, Enns floating in the new and old customers trust and support, and achieved excellent results. In order to thank new and old customers long-term sales of imported bearings on Enns floating center support in the 2010 New Year's Day approaching, Enns floating bearings sales center, general manager with the staff wish you all a Happy New Year and good luck, plenty of money, career more on a new level.

 Enns Floating Angular contact ball bearing Sales Center brands imported thin bearings, including Sweden SKF Bearing, Japan NSK Bearings, Germany FAG bearings, Japan NTN Bearing, the United States TIMKEN bearings, Germany INA Bearing, IKO needle roller bearings imported bearings brands. Products involved: deep groove ball bearings, cylindrical roller bearings, tapered roller bearings, aligning ball bearings, spherical roller bearings, needle roller bearings, angular contact ball bearings, thrust ball bearings, thrust roller bearings, spherical plain bearings, spherical bearings, and linear guide series.

2010 New Year's Day is a new starting point, represents a promising year, we imported bearings sales center Enns float will make more effort to the best quality, best price, fastest speed, the best service to repay the new and old customers.

especially in the financial crisis

 Beijing NSK roller bearing sales center is said, May 2, 2010, the 11th Beijing International Automotive Exhibition has been the industry as "by far the world's largest auto show next successfully concluded in the 10-day show in , to "Imagine a Green Future" as the theme, demonstrating people, vehicles and nature live in harmony ideal picture for our brand to provide quality green innovation platform for the display as the world's top-class auto parts conglomerate - NSK bearings company, NSK portrait artist of the 11th Beijing International Automotive Exhibition. classic booth design, top-notch products, professional technical explanation, showing NSK for endless pursuit of high quality products and excellent professionalism NSK employees, cited to many domestic and foreign car manufacturer's attention.  Beijing Auto Show as China's largest auto show, along with the development of China's automobile market is becoming Angular contact bearing important, especially in the financial crisis, China's auto market thriving, like the desert among a pool of water, attracting all global automotive internationally renowned manufacturers and parts manufacturers of the eye, auto parts suppliers such as: Bosch, DENSO, Magna, NSK, Alpine, Bridgestone, Dunlop, Hankook, attended this show. NSK as the world's top-class auto parts scale comprehensive enterprise, which prides itself on quality products NSK Bearings Automotive World No. 1, EPS world-leading products, NSK bearings distributor in China has and will continue to be China and the world automobile manufacturers to provide cheap and quality auto parts. After the experience with the baptism of the Beijing Auto Show, NSK will continue to achieve safe, comfortable and environment-friendly society and boost automobile automobile industry to make greater contributions

customers can solve the cause unplanned downtime

SKF was awarded the contract in 2009 with S - Oil companies, the contract goal is to better utilize SKF's enterprise resource planning system (ERP), through improved operation and maintenance practices and Slim bearing process systems, helping S - Oil Companies achieve important strategic objectives.

      SKF's service department general manager, Mr. Vartan Vartanian spoke: "SKF help customers increase their assets so that they become more reliable and efficient Cross bearing. We also help S - Oil company to achieve health, safety and environmental standards (health and safety) of refinery. "

     "SKF has helped S - Oil company to achieve important strategic objectives and have been transferred to a very efficient and professional way in the knowledge that our asset efficiency of operators and maintenance personnel who." S - Oil company's project manager JH Han commented.

       SKF comprehensive service solutions, customers can solve the cause unplanned downtime, lost production, energy consumption and associated costs of most problems. It also includes the establishment of priorities, work planning and scheduling, job performance profiles, and the establishment of key strategic goals.

North a big cuddle (Beijing) Company NSK awarded Excellent Supplier Award

 Recently, the North a big cuddle (Beijing) Machine Tool Co., Ltd. to NSK (NSK) Investment Co., Ltd. awarded the 2010 Supplier Excellence Award in China for NSK Ltd. in quality and delivery cycle of recognition and praise.   According to the Beijing NSK spherical roller bearing sales company, this is the first time NSK won the North a big cuddle (Beijing) Machine Tool Co., an excellent supplier of the title, this North a big cuddle from 65 vendors participate in the selection, NSK Corporation is this Accreditation of five times honored suppliers. Criteria include: price, delivery time, delivery quantity accuracy, appearance of the packaging, quality and other aspects of the comprehensive assessment of eight. Since 2010 the company NSK NSK angular bearing in precision delivery quantity and delivery cycle has received a praise, therefore, the North a big cuddle (Beijing) Company NSK awarded Excellent Supplier Award.About NSK distributor in North China a big cuddle companies, the North a big cuddle (Beijing) Co., Ltd. by the Japan Machine Tool cuddle machine with Beijing First Machine Tool Group joint venture, mainly for automobile manufacturing enterprises processing equipment supporting production. 2010 sales of 350 million yuan, the cumulative production of machine tools totaled 540 units.

NSK exhibitors 2010 Beijing China International Exhibition Coal

Seiko Corporation of Japan (NSK LTD.) On October 26 -29 days participating in the Beijing National Agricultural Exhibition at the 2010 China International Coal Fair, here is the distributor of NSK China's reported. 2010 China International Exhibition, organized by the State Coal Mine Safety Supervision bearing manufacturers, the National Energy Administration, China Coal Industry Association co-sponsored by the State Administration of Production Safety Supervision and Management Center for International Cooperation contractor, the theme was "safe and efficient mining, green carbon use." In addition to showcasing the exhibition changing the mode of development of coal industry's achievements in scientific and technological innovations of coal enterprises, the main show coal production, preparation and processing, mine construction, coal transportation, coal mine safety, geological exploration, coal chemical industry, mine explosion Double roller bearing aspects of advanced technology and equipment. Exhibition 2010 Beijing China International Exhibition Coal origin of the Chinese, the United States, Britain, Japan, Australia and other countries and regions, more than 10 research institutions and numerous famous. As the world's largest bearing manufacturer Seiko Co., Ltd., one of Japan (NSK), also participated in the exhibition. And exhibited a series of devices, bearing as many of the core components of mining machinery, almost throughout all the equipment in the field. 2010 Beijing China International Exhibition on Coal, NSK exhibited a series of mine and all kinds of Bearings NSK Bearings special installation tools, test equipment, in-kind exhibition and novel video presentation attracted up to 2,000 people, the number of daily visitors to visit, a total of issue various samples sent up to 1,555 books, by the visitors alike.By NSK exhibitors 2010 Beijing China International Exhibition Coal, NSK with more exhibitors had extensive experience and information exchange, consolidate and develop more win-win partnership. The exhibition on the further development of NSK, has played a catalytic role.

this is how a unique creative roof ah

FAG spherical roller bearings are used in new Wimbledon Centre Court retractable roofLift the Wimbledon Centre Court , and perhaps someone knows , but you notice the stadium roof , Wimbledon Centre Court retractable roof of a new major feature is translucent, retractable roof , this is how a unique creative roof ah , but this decorative building structure , there is an important role in the structure responsible for its open or close in ten minutes , what is it ? Closer to home, the open and close are inseparable FAG row radial ball Special bearings in this retractable roof is equipped with 300 FAG radial spherical roller bearings and spherical roller thrust bearings, FAG bearings to ensure these stadium roof within ten minutes in the open or closed.Schaeffler for the project provided a total of more than 300 bearings. These bearings consist of fag-aligning roller bearings , mainly used for supporting both ends of the roof arch hinge radial load and thrust roller bearings for supporting the roof of the cable taut expand the axial loads. Provide maximum self-aligning roller bearings, an outer diameter of 200 mm , can withstand 300kN (30 tonnes) standard radial load , mainly used at both ends of the arch bracket hinge . Thrust roller bearings will assume approximately 600kN (60 tonnes) of the axial loads that are supported by the support structure and roofing materials arched cables produced .Since the bearing is completely sealed in the hinge group, not exposed to external weather conditions . In other words, Schaeffler can choose from standard products, bearings, its easy to use and offers . These bearings are filled with high-quality internal grease when the roof is expanded , and in the center of the stadium at the top is closed, the top of the dome architecture designed to help building forces from wind, rain , snow pressure.

From the design point of view

About roller bearing Assembly Dimension Chain Definition
Closed loop assembly dimension chain is often imported bearing assembly precision or technical requirements. Because this requirement is met through the parts, components assembled before the final form and guaranteed, size, or position is a result of the relationship.

From the design point of view, is the lead assembly precision bearings and forming the China roller bearing for assembly dimension chain, which also determines the design and manufacture of precision parts basis. Identify with the precision of parts and the corresponding relevant dimensions, and draw the corresponding dimension chain diagram. And the accuracy of the relevant parts related parts called, the corresponding relevant dimensions, called correlation dimension is an integral assembly dimension chain ring.

The establishment of assembly dimension chain is the first step in solving the problem assembly accuracy, only when creating assembly dimension chain is correct, it makes sense to solve dimensional chain. Therefore, in the assembly dimension chain, this step is very important.

because we are the company in similar projects

Schaeffler UK product support engineer Derek Peasley , Mr. Tsang and Street CraneXpress company's engineers work closely together. He said: " We are very pleased with the Street CraneXpress company in this prestigious project together from the design process, we have the company's professionalism impressed , we are convinced that the selected Angular contact ball bearing in this grim application environment, good performance . "In selecting suitable for installation in the fold hinge bearing rolling elements supporting the internal , the Schaeffler UK company and its customers Street CraneXpress Ltd has worked closely , the company is a mechanical processing company located in Sheffield . Street CraneXpress Ltd company responsible for the design , manufacture and installation of roof can be opened for all mechanical and electrical components Street CraneXpress project manager Daniel Salthouse roof at Wimbledon working on the project more than five years . He commented , " In the past, we have to use other Big ball bearing bearings suppliers , but on this project , we decided to collaborate and Schaeffler UK companies , because we are the company in similar projects , such as the London Eye and the temperature Bourdon stadiums and other projects to provide excellent technical support, as well as in the selection and supply bearings expertise impressed . ""When 15,000 people sitting in the center court area , we may encounter unpredictable winds and other weather conditions, bearing on the open roof support is critical . Safety, reliability , low maintenance requirements of this project is particularly important. bearing life of 20 years to 25 years between the bearing grease lubricated to ensure easy maintenance and has a long service life . "Salthouse added.

Attachment: Wimbledon Centre Court introduced a new retractable roof

 Street CraneXpress project manager Daniel Salthouse roof at Wimbledon working on the project more than five years . He commented , " In the past, we have to use other bearings roller bearing company suppliers , but on this project , we decided to collaborate and Schaeffler UK companies , because we are the company in similar projects , such as the London Eye and the temperature Bourdon stadiums and other projects to provide excellent technical support, as well as in the selection and supply bearings expertise impressed . "  "When 15,000 people sitting in the center court area , we may encounter unpredictable winds and other weather conditions, bearing on the open roof support is critical . Safety, reliability , low maintenance requirements of this project is particularly important. the roller bearing company life of 20 years to 25 years between the bearing grease lubricated to ensure easy maintenance and has a long service life . "Salthouse added.Salthouse said Mr. Schaeffler UK technical support bearing mounting typical example is to provide guidance . " Schaeffler UK engineers provide comprehensive advice and guidance , greatly accelerated the assembly process ." Salthouse said.   Attachment: Wimbledon Centre Court introduced a new retractable roof   Roof both open or closed can provide robust and secure ( does not slip ) of the venue. In the closed position , the natural light through the translucent roof exposure to the grass in any adverse weather conditions can play a protective role on the grass . Roof design itself as " collapsible hexagonal design ", when not using the roof , the roof can be folded into a high compression zone. Even the roof closed, the roof can also create a transparent "open" feeling. The entire roof area of ​​5200 square meters, developed by a special waterproof material , very strong and full of flexibility. The key elements of the roof design when the roof is in the closed state, a lot of natural light can be irradiated to the grass. Airflow system from the closed space of the condensation detached , so as spectators and players and provide a most comfortable environment inside .

individual transport vehicle localization

 In the past, such as a car unit, which is unwilling to be able to achieve in the freight train . Information and data , it is best to use satellite technology supply , can only be an independent , self-sufficient energy supply systems . "This should be grateful for FAG Group invention Generator Sensor Bearing , via satellite communications has opened up new possibilities for optimizing logistics and freight transport , and to improve traffic safety ," angular contact bearing, FAG electromechanical systems commander said. Sensor integrated in the bearing not only record data about the conditions of axle bearing itself, such as wear or overheating also recorded . Generator Sensor Bearing FAG determining and monitoring features, speed, temperature , mileage and noise , so that conclusions about the condition of the wheels , bogies and even railway track . This means that a good combination of the two can . Evaluation of data records is also the rotating thin section bearing and optimize the entire transport and cargo flow and trucks available space control , positioning, tracking and calculating utilization costs , considering the loads, the number of axes , time and distance . Great innovation , transport and logistics is self-sufficient in energy production by connecting the motor bearings and FAG send sensor data sensor and the respective vehicle units and high-level information form the new control system . FAG train control system is in proximity to rail guidance system is an important step , is currently undergoing preliminary testing and Finnish track. In addition to GPS data acquisition. In other words, individual transport vehicle localization, the entire logistics chain review - transporting goods through satellite tracking , this knowledge , the current way to make optimal use of the scheduling and container freight vehicles . Germany FAG Bearing Group not only provide you with quality FAG bearings, can also provide you with the module inheritance, measurement technology, power transmission and control , as well as internally developed computer program enables our engineers to direct a global user-oriented design full transmission system and the required bearing support program . Chinese distributor FAG FAG Bearings you are welcome to inquire the price .

Schaeffler Group President and CEO Dr

Schaeffler Group Appoints New Chief Financial Officer
         We learned from Germany FAG thin section bearing Group, March 18, 2009, the Schaeffler Group Appoints New Chief Financial Officer Klaus Rosenfeld as President. Mr. Klaus Rosenfeld Dresdner Bank AG board member since 2002, is responsible for Dresdner region's financial control, business investment. Schaeffler Group President and CEO Dr. Yu Ergen said Claudia Strobel Senfei De sir "Claudia Strobel Senfei De, we have listened to the views of many angular contact bearing members and experts acknowledged, you want to Schaeffler Group this challenging financial environment to grow, it must Schaeffler Group's financial management to make greater contributions to the cause, you understand? "replied Mr. Klaus Rosenfeld quite sure Before February 18, has informed the German FAG Bearings Group's former chief financial officer Thomas Hetmann (46 years old) will leave the company after the transfer of its duties. Schaeffler Group thanked Mr Thomas Hetmann the hard work and dedication to the company.

not to be user adjusted.

Double row tapered roller bearing outer (or inner) as a whole. Two inner (or outer) face close to the middle spacers, clearance by the thickness of the spacer to adjust, and can also be used to adjust the thickness of spacer double row tapered roller bearings are preloaded.
Tapered roller bearings mainly bear radial diameter and axial joint load. Load bearing capacity depends on the outer ring raceway angle, angle greater carrying capacity. These ball bearing manufacturer are separable bearings, rolling bearing according to the number of rows into single row, double row and four row tapered roller bearings. Single row tapered roller bearing clearance to be adjusted during installation the user; double row and four row tapered roller bearing clearance in the factory according to user requirements is given, not to be user adjusted.
Tapered roller china ball bearing have tapered inner and outer ring raceway, Tapered Roller arranged in between. All conical surface projection lines are the same point on the bearing axis together. This design makes tapered roller bearings particularly suitable for combined (radial and axial) loads. Most of the axial load bearing capacity is determined by the contact angle α; α angle increases, the higher the axial load capacity. Angle size calculation factor e; e larger the contact angle the greater the bearing axial load greater applicability.
Tapered roller bearings are usually separated type, namely the belt roller and cage assembly of inner components can be composed with tapered conical outer inner (outer) installed separately.
Tapered roller bearings are widely used in automotive, mill, mining, metallurgy, plastics machinery and other industries.

Safety, reliability, low maintenance

In selecting suitable for installation in the fold hinge china bearing supplier rolling elements supporting the internal, the Schaeffler UK company and its customers Street CraneXpress Ltd has worked closely, the company is a mechanical processing company located in Sheffield. Street CraneXpress Ltd company responsible for the design, manufacture and installation of roof can be opened for all mechanical and electrical components. Street CraneXpress project manager Daniel Salthouse roof at Wimbledon working on the project more than five years. He commented, "In the past, we have to use other bearings bearings suppliers, but on this project, we decided to collaborate and Schaeffler UK companies, bearing manufacturers we are the company in similar projects, such as the London Eye and the temperature Bourdon stadiums and other projects to provide excellent technical support, as well as in the selection and supply bearings expertise impressed. " "When 15,000 people sitting in the center court area, we may encounter unpredictable winds and other weather conditions, bearing on the open roof support is critical. Safety, reliability, low maintenance requirements of this project is particularly important. bearing life of 20 years to 25 years between the bearing grease lubricated to ensure easy maintenance and has a long service life. "Salthouse added.
Salthouse said Mr. Schaeffler UK technical support bearing mounting typical example is to provide guidance. "Schaeffler UK engineers provide comprehensive advice and guidance, greatly accelerated the assembly process." Salthouse said.

pick up litter along the way along the Xiangjiang River

Attaches great importance to the interests of employees
Under normal circumstances , Timken interests hoping to achieve three unified , that shareholders 'interests , the interests of customers , employees' interests .
Here, not only refers to the remuneration of employees' interests , but also including the work environment , individual capacity building , career development and so on. Provide resources to help employees self-study, in order to achieve the ability to enhance , is one of them .
Timken employees, Timken University at large have learning experience . This is an online site that offers mentoring programs and online training resources , covering about leadership , speech and eloquence , cultural differences, anti-corruption , ball bearing manufacturing technology, curriculum over 20,000 .
Take general manager Zhong Zhiyong , the April this year , has completed 15 courses , more than 20 courses in the second half there waiting for him .
"Different positions , every year a different course. Course functions, one to help employees improve , the second is for employees in mind , such as legal provisions updated, personal knowledge will have to make ."
In addition, Timken employees worldwide Education Foundation will offer scholarships to children and encourage them to pursue higher education .
Committed to creating sustainable value
As flagship product is the fan bearings , Xiangtan plant renewable energy industry has single ball bearing an important part . Meanwhile, the plant also uses advanced LEED (LeadershipinEnergyandEnvironmentalDesign) environmental standards as a basis for building design , green energy saving in strict accordance with the standard factory building , and in 2011 received a LEED Gold certification. These are Timken responsibilities embodied in the environmental field .
In addition, Xiangtan plant also became the province's first national two safety standardization enterprises.
Among employees , spontaneous ride , pick up litter along the way along the Xiangjiang River ; donate team award , visit the orphanage children ; cooperation with Hunan University , Job Shadow Day ...... conduct these activities so that each participant felt to join communities, fulfilling and enjoyable .
"An honest man , do a down product ." Zhong Zhiyong 's concluding remarks , the simple , yet intriguing. The Timken Company always adhere to the quality of corporate brand competitiveness

it is possible to reduce the weight of the car battery and extend farther.

NTN developed lubricants and adoption of new technologies can be sealed bearing retainer 50% decrease resistanceBack]NTN (NTN) using a newly developed lubricant and cage, developed a resistance to rotation compared to the previous product reduced by 50% or more sealed deep groove ball roller bearing. For the EV (electric vehicle) motor, can reduce mechanical losses and improve efficiency, it is possible to reduce the weight of the car battery and extend farther.
For supporting the rotor is sealed deep-groove ball bearing due to the light load, the circumstances under high-speed rotation, so the rotational resistance from most of the lubricant oil sealed in the internal stirring resistance. NTN To reduce this resistance, constituting the lubricating base oil, thickener and additives these three elements, the implementation of a lower viscosity base oil, and the fine structure of the improved hand jack. Base oils combined thickener has prompted function, therefore, will enhance the micronized base oil retaining capacity of the state, thereby reducing the amount of thickener used.
The noise when driving (quietness), the motor to ensure the original performance equal or lubricant. Further, with the use of the best ratio of lubricating oil additives, oxidation inhibited lubricant caused by the aging, to achieve the same or higher with the previous product life.
In addition to the development of oil, but also improves the rolling element cage and cage pocket shape of the contact hole is suppressed too much lubricating rolling surface of a bearing case.

this design also ensures the bearing or drive all the features.

SKF bearings distributor in China editing, along with the development of wind turbines, wind power generators become the development trend of the market, and one of its main components bearing various suppliers also become the target relative to catch up. SKF Group in order to meet this goal developed for wind turbine SKF Nautilus bearing corp  tapered roller bearings.SKF specially developed for high-power wind turbines large contact angle of tapered roller bearings Nautilus bearings. SKF Nauti this design also ensures the bearing or drive all the features.lus bearing for the back to back in the form of tapered roller bearings, with the larger the contact angle (45 °). SKF Nautilus bearing not only allow single bearing spindle configurations as possible, while greatly reducing the traditional design of the drive chain length so compact wind turbine designs. Of course, this design also ensures the bearing or drive all the features.
SKF Nautilus bearing a remarkable feature is its use of a segmented plastic cage, segmented cage design, as each individual component is very small, and no intermediate links, even in the loaded state of the bearing will not affect the deformation of the shape of the cage and the rolling element guide. Also, because each component only four rolling, therefore, the holder will be generated by the friction is reduced to a minimum range. SKF Nautilus bearings of plastic, not only to ensure adequate strength, and its lighter weight to ensure the rotation of the bearing performance, while reducing the friction in the bearing, so that the application of more reliable and lubricating higher selectivity.In addition, the traditional pairing (or double row) tapered roller bearings, the contact angle is generally only about 20 °, while ensuring its larger radial load capability, roll bearings  axial load carrying capacity and the ability to withstand the overturning moment subject to certain restrictions. SKF Bearing break through the traditional design of the contact angle, the contact angle of each single bearing enlarged to 45 °, in the bearing radial load capacity of the premise, greatly strengthened the axial load bearing capacity, while, SKF Bearings can also withstand large overturning moment

Double row cylindrical roller bearings are divided into two forms:

     ⑴ NN0000 type double row cylindrical double roller bearing
     The bearing structure is compact, small deformation under load, it is particularly suitable for machine tool spindle bearing. Its outer wall, so you can install the outer ring and the inner components, respectively (with roller and cage), does not limit the axial displacement of shaft or housing, the same size and radial single row cylindrical roller bearings , can withstand greater radial load.
     ⑵ NN0000K type double row tapered bore cylindrical Slewing bearing
     This kind of bearing structure is compact, small deformation under load and therefore suitable for machine tool spindle bearing. Bearing bore is tapered to micro adjust the radial clearance.
     This kind of bearing outer ring without ribs due, it can be installed separately outer and inner components (with roller and cage), does not limit the axial displacement of shaft or housing, the same size and radial single row cylindrical roller bearings compared to withstand greater radial load.

Preload is the bearing assembly to the inner or outer ring an axial force to remove the needle bearing clearance

 it is necessary to accurately calculate the rotating rings fit the amount of interference , but also suitable for accurate calculation of the amount of the fixed ring . Rotating rings blanch the amount of interference to the extent possible should also get smaller . As long as the operating temperature and ensure the effect of thermal expansion , and the maximum speed of the centrifugal force , resulting in a tight fit so as not to creep or sliding surfaces . Fixed ring size according to the work load and bearing size, select small clearance fit  needle roller china bearing operating under conditions such as high speed , and high operating temperatures , special attention should be rotating rings can not be too loose to prevent eccentric , as well as non- fixed ferrule with a gap to prevent sleeve ring deformation under load and to stimulate vibrations.

Rolling in the work allow slight noise , if the noise is too large or unusual noise or crash, it indicates that the bearing has failed.

Preload is the bearing assembly to the inner or outer ring an axial force to remove the needle slewing ring bearing clearance , and to move the body and the inner and outer contacts generated at the beginning of deformation. Preload can improve the working condition of the bearing stiffness and rotational accuracy , load bearing large , rotating high precision bearings , mostly in the absence of even a small amount of clearance over the work of state interference , in which case it required in the assembly, the bearing preload . Clearance and preload adjustment are usually seen by the inner ring relative axial displacement of appropriate methods to complete. From the above process is not difficult to learn concepts , through to move the bearing clearance adjustment , can improve the bearing capacity and rotation accuracy , progressive bearing life. But at the same time make the bearing frictions , fever increases, so the clearance or preload adjustment when necessary to ensure good lubrication and heat dissipation. If improperly adjusted or poor lubrication , it will in turn cause increased bearing wear , reduced life expectancy .

SKF spherical roller thrust bearing concept

In spherical roller thrust bearings, the load bearing catalogue axis is angled away from the raceway to another raceway. Therefore, bearing in addition to radial loads, but also can withstand axial load simultaneously. Spherical roller thrust bearings Another major feature is its self-aligning capability, which allows a certain degree of axial downtown area between the shaft and the bearing alignment errors.

SKF spherical roller thrust bearings have a lot of asymmetric stick with the specially designed raceway has an excellent fit. It can withstand heavy load, and allows a relatively high speed.

SKF spherical roller thrust bearings depending on the size and series, there are two kinds of designs. Size 68 or less suffix E bearings, window design with just the press cage with rollers and shaft ring composed of an inseparable component. All other bearings are fitted with machined brass or steel cage, the cage consists of a ring mounted on the shaft of the guide sleeve. Shaft ring, rollers and cage form an inseparable component.

How to install the rear thrust bearing test

Install thrust bearing manufacturer, shaft ring and shaft should examine the vertical centerline. Method is fixed to the tank shell dial gauge face, the head of the table to touch the top of the bearing shaft rotating bearing ring raceway, while observing dial gauge pointer, if the pointer deflection, indicating ring and shaft centerline axis is not perpendicular. Tank shell hole deeper, we can still use an extension of the dial gauge head test.Thrust bearing is installed correctly, the seat can automatically adapt to the rolling elements rolling, make sure to scroll down raceway body is located. If installed backwards, not only bearing is not working properly, and each mating surface would be subjected to severe wear. As shaft ring and seat ring and the difference is not very obvious, the assembly should be careful not to mistake. In addition, the thrust bearing race with the bearing hole should be left between 0.2-0.5mm gap to compensate for parts processing, the error caused by mounting inaccuracy, when in operation bearing ring center offset, this gap would ensure its automatic adjustment, avoid touching the friction to operate normally. Otherwise, it will cause severe damage to the bearing.

Cause bearing failure caused

According to the bearing surface grinding metamorphic layer formation mechanism, the impact grinding metamorphic layer of the main factors is the grinding heat and grinding force. The following analysis on the reasons for bearing failure.

1 bearing the grinding heat

The thin bearings grinding, the grinding wheel and the workpiece contact area, consume large amounts of energy, resulting in a large number of grinding heat, causing the local instantaneous grinding zone temperature. Use of linear motion heat transfer theory derivation, calculation or application infrared and thermocouple method measured the instantaneous temperature under experimental conditions can be found in the 0.1 ~ 0.001ms instantaneous temperature within the grinding zone up to 1000 ~ 1500 ℃. Such instantaneous temperature, a certain depth sufficient to work the surface layer of high temperature oxidation, amorphous structure, high-temperature tempering, secondary hardening, cracking and other changes or burns.

(1) the surface oxide layer

The instantaneous high temperature steel surface under the role of oxygen in the air, up into very thin (20 ~ 30nm) thin layer of iron oxide. It should be noted that the oxide layer thickness and the total thickness of the surface layer of grinding deterioration test results showed a corresponding relationship. This shows that the thickness of the oxide layer which is directly related with the grinding process, the grinding quality is an important symbol.

(2) amorphous tissue layer

Instantaneous grinding zone so that the surface temperature reaches a molten state, the molten metal molecular flow has been evenly coated on the work surface, and is the base metal at breakneck speed cooling, forming a thin layer of amorphous tissue layer. It has high hardness and toughness, but it is only about 10nm, it is easy to be removed precision grinding.

(3) high-temperature tempering layer

Instantaneous grinding zone temperature to a certain depth can (10 ~ 100nm) is heated to a temperature above the tempering heating the workpiece. Does not reach the austenitizing temperature in the case, as the heating temperature is increased, the surface layer by layer will be generated corresponding to the temperature of the heating or tempering retempered organizational changes, hardness is decreased. The higher the heating temperature, the hardness decreased also more powerful.

Installation of high-speed bearings fit and adjustment

A high speed bearings with clearance and according to both the high-speed precision bearings bearing requirements, but also according to temperature bearing requirements, so consider the coordination and clearance to take account of the following points:

(1) when the temperature rose to high temperature dimensional change and hardness; (2) caused by high speed centrifugal force system change and shape change.

In short, high-speed, high-temperature conditions, coordination and clearance from the choice of the bearing should strive to maintain the accuracy and performance, it is difficult.

In order to ensure the bearing raceway after installation of small deformation, interference fit amount of interference can not get too big, and high speed centrifugal force and high temperature thermal expansion, or offset with the surface normal pressure. Or so with the surface relaxation, so the amount of interference must be considered under the premise of these two factors be carefully calculated, at room temperature constant speed and effective amount of interference for high-speed bearings may be invalid.

If the calculation results of this contradiction is too large (usually only in the ultra high speed only in this case), only by taking the lubrication ring lubrication and hydrostatic lubrication with a double measure, and this solution has the potential to break the bearing dmn value 3 million mark.

In considering the high speed bearing clearance is not only to consider the above factors, but also to consider the thermal elongation axis of the impact on the clearance required bearing in working condition, that there is at operating temperature optimum clearance, which kind of clearance is taken into account, the outer ring ball groove center precise alignment of state formation. As high-speed bearings for lower relative sliding and internal friction, it is best not to use the inner and outer rings relative axial displacement method to adjust the ball bearing clearance.

In considering the amount of interference with the bearing and clearance, to note that materials at high temperatures becomes soft and easily deformed features, as well as many from the room temperature to high temperature changes cause some permanent deformation possibilities.

(2) the requirement for host-related parts

Where the rotational speed bearing system requires precision bearing dynamic balancing shaft and the bearing seat hole installation site should have higher than normal required size and shape precision accuracy, especially for concentricity and retaining shoulder seat hole or journal vertical, and in consideration of these issues, it must also be noted that the high-speed operation of the bearing element and the temperature factor.

Shaft support systems require both high rigidity, and quality requirements as light as possible, in order to overcome this contradiction can be taken, such as reducing the surface roughness and improve surface hardening measures to improve the supporting stiffness, the use of hollow shaft to reduce system quality.

3 high-speed bearings examples of the development hereby HA type with ultra high-speed development of tapered roller bearings for example.

(1) of the problem

In the gas turbine and certain machine tools and construction machinery, high speed and axial load, using the ball bearing is life is too short, use a short cylindrical roller bearing axial load capacity is insufficient, the axial clearance is difficult to adjust, hoping to use cone roller bearings break this problem.

(2) must be solved key technology

Increase speed limit tapered roller bearing technology lies in improving inner ring large rib and roller end lubrication between the state, this area most likely to occur at high speeds severe wear and burns, is the main reason for limiting its high speed.

(3) solution

The general structure of tapered roller bearings, the oil circulation routes in the inner wall with a large roller end contact area is difficult to get oil, and this part of the relative sliding big, precisely needed most lubricants.

Therefore, Japan and other countries have developed HA-type tapered roller bearings, this bearing wall in the outer ring, so that the flow of oil can lubricate the outer ring ribs and roller end contact part, but here even when at rest can also save some oil, to avoid the starting lean burn accidents, but click on the outer wall of the need to create several drain hole to prevent oil discharge passage without, retention caused by certain parts of the oil agitation loss of power and temperature l too high. Since no inner wall, the temperature decreased, thus reducing the mating surface between the inner ring and the shaft occurs between peristaltic possibilities. This structure of the bearing outer ring on the cage used to guide the way, so that the cage can be more smoothly guide roller without askew functioning to avoid vibrations and excessive wear and tear, which will also help speed.

(4) can be achieved

This bearing type HA dmn value up to 200 million, more than triple the normal structure, for example a gas turbine this bearing spindle gear (Model I-IA30205), the axial load 1000N conditions, guarantee There 2L/min the implementation of the bearing to the oil supply of the 4th cycle turbine oil, its working speed of up to 60,000 will not appear in turn burns.

Bearing rings of cold treatment method

Quenching the bearing ring to cool to room temperature, immediately placed in an environment below room temperature a certain time, out at room temperature, this is lower than the processing temperature is called cold treatment. Bearing steel cold treatment is often used freezers and dry ice alcohol solution.
1 The role of cold treatment
    Precision bearings for higher dimensional stability; ferrule hardened (especially quenching), the internal organization retains more residual austenite, this residual austenite is unstable organization, storage and use of bearings process will continue to change, thus changing the accuracy of the cross bearing. Therefore the use of cold treatment process, it can reduce tissue retained austenite, slightly increase the hardness of parts.
2 Cold Process
    Stay at room temperature after quenching: quenching, must make uniform cooling to room temperature inside and outside the ring after the cold treatment, or easy to crack, cooled to room temperature immediately after cold treatment (usually no more than 30min), otherwise it will abort the austenite to martensite changes.
    Cold treatment temperature: the temperature of cold treatment based primarily on termination of martensitic transformation temperature of the steel Mf, while also considering the cold treatment on the mechanical properties and process and other factors.
    For GCr15 steel, cold treatment selection -70 ℃; accuracy is not very high ferrule or equipment limitations, the cold treatment temperature optionally -40 ~ -70 ℃; super precision bearings in the -70 ℃ ~ -80 ℃ between the cold treatment. Cold temperatures affect the bearing life impact fatigue and exposure.
    Cold insulation: Although a large number of martensite is cooled to a certain temperature Tilting moment to complete, but the number of rings to make both surface and core part cold treatment to achieve uniform temperature, requires a certain holding time, usually 1 to 1.5 h.
    Cold treatment after tempering: ferrule on the air after the cold treatment, the temperature was slowly warmed to room temperature tempering timely manner. Temperature can not be too fast, or easy to crack; tempering timely, otherwise the internal ferrule large residual stresses can cause cracking rings, generally no more than 2h.

Bearing basic technical knowledge

Bearing joints: the sliding contact surface of the spherical, mainly applicable to swing movement, tilting movement and rotation of spherical plain bearings.

Bearings: a set of bearing two or more simultaneously by said bearing structure combination of rolling bearings. Such as needle roller and thrust cylindrical roller bearings, needle roller and thrust ball bearings, needle roller and angular contact ball bearings.

Other Bearings: In addition to the above other than the structure of the rolling bearing.

2, the bearing parts

Bearing parts: one consisting of the parts bearing, but does not include all the accessories.

Bearing rings: one or several raceway bearing to the heart of the annular parts.

Bearing washer: with one or several of the thrust bearing raceway ring parts.

Flat ring: a detachable substantially flat washer, use it as an inner or outer part of the radial cylindrical roller bearing outer or inner ring of a wall.

Thrust collar (detachable): a separable with "L" shaped cross-section ring, with the outer part of a radial cylindrical roller bearing inner ring of a wall.

In the ring: having two or more rows of rollers of a roller bearing inner ring separable used to isolate two rollers and guide rollers.

Snap ring: single port having a constant cross-section ring, mounted in a ring ditch, a roller bearing in the housing or shaft axial position.

Lock ring: single port with constant cross-section ring, mounted as a ring in a ring ditch rollers or cage will remain in the bearing.

Spacer: the annular parts, for the two bearing rings or bearing washer, or between the two halves or between the bearing rings between the two halves of the bearing washer, so that they are maintained between the axial distance required.

Seals: formed by one or several parts of the ring cap fixed to the bearing and a ferrule or the gasket ring or gasket in contact with another or to form a narrow gap labyrinth, prevent oil leakage and foreign matter.

Cover: is a ring cover, usually a thin metal plate stamping, a ring fixed to the bearing or washer and extending towards the other ring or gasket, cover bearing internal space, but not with another ring or gasket contacts

Crossed roller bearings composition and characteristics

Crossed roller bearings are divided into two categories, one is a cross cylindrical roller bearings, another is a cross-tapered roller bearings. Cross roller bearings in a foreign country has a long history of application, while in the country is only in recent years before entering the public's sight, with its own characteristics and have other bearings incomparable superiority and well received by everyone be used.

Cross cylindrical roller bearings, having been split inner or outer ring, load rollers and spacer retainer after the Cross-Roller Ring and fastened together to prevent separated from each other, so when you install the cross roller bearing easy to operate. Since the rollers are arranged to cross, so only one set of Cross Roller Ring can bear loads in all directions, compared to conventional models, rigidity increased by 3 to 4 times. Meanwhile, imports bearing Cross cylindrical roller bearings Crossed roller bearings due to inner or outer ring is split in two, the bearing clearance adjustable, even if they are applied preload can be obtained with high precision rotary motion.

Crossed roller bearings Features:

1 operation simplifies installation

Standard cross roller bearing outer ring is divided into two parts, or inner, load roller and cage after being fixed together, you can fine tune the connection when installing bolts and mounting flange to achieve the desired load state Therefore, the installation operation is very simple.

2 bear large axial and radial loads

Because roller at 90 ° to the V-shaped groove raceway via a spacer retainer is arranged perpendicular to each other, this design makes cross roller bearings can withstand greater radial load, axial load and moment load and all the direction of the load.

3 installation space savings

Cross roller bearing outer ring size is minimal miniaturization, especially thin structure is close to the limit of small size, and high rigidity, so the most suitable for industrial robot joints or rotating parts, machining centers of rotation table, manipulator rotating part, precision rotary tables, medical equipment, measuring instruments, IC manufacturing equipment, etc. wide range of applications.

Cross roller bearing surface rust work

Cross roller bearings in the preservation and operation of the process, because of its metal and the external environment, it is easy to produce rust. This not only greatly affect the running properties of the bearing, reduced efficiency. But also to the bearing life greatly reduced. cross roller bearing rust of the surface pretreatment methods:

1 Surface cleaning: cleaning rust must be in accordance with the nature of the surface and the prevailing conditions, select the appropriate method. Commonly used with solvent cleaning, chemical cleaning and mechanical cleaning treatment method.

2 available after the surface is dry clean filtered thrust cylindrical roller bearings drying compressed air, or by 120 ~ 170 ℃ of the drier, can also be wiped clean gauze.

Coated with anti-rust oil Method:

1 immersion method: Some small items using immersion in rust oils, allowed a layer of rust on the surface adhesion grease approach. Antirust film thickness can be controlled by the temperature or viscosity of the oil to achieve.

2 brushing method for NA immersion or spray outdoor construction equipment or special shape products, brush when it is necessary to pay attention not produce accumulation and pay attention coated to prevent leakage.

3 spray some large objects can rust oiled using immersion method, generally about 0.7Mpa pressure filter with compressed air spray cleaner place. Spray application of anti-rust oil or solvent dilution thin rust oil, but must adopt comprehensive fire protection and labor protection measures.

Bearing inspection and acceptance of the method

Check the bearing, the user must have the following knowledge:

(1) Which of the bearing commodities inspection standards based;

(2) What bearing commodities inspection items, why should test these items;

(3) bearing merchandise conducting quality inspection, you need to do to prepare the work, why should these preparations;

(4) the various test items bearing merchandise under what conditions, with what methods, what equipment to be tested, the test results must be within the tolerances in how to be qualified;

(5) bearing large quantities of goods and sometimes, not one hundred percent inspection, then it should be what kind of sampling plan, what quantity taken for examination in order to more fully with sufficient reliability to represent all the goods bearing the quality and inspection The result has to be measured according to what criteria to determine whether these products are qualified batch should be accepted or rejected should be unqualified approval.

Acceptance inspection of cross roller bearing can generally be divided into three categories, namely:

Routine check - bearing arrives routine general inspection.

Routine examination - of the bearing assembly associated with dimensional accuracy, precision rotation, bearing clearance and the bearing of the residual magnetic intensity of such items to be checked.

Special inspection - the quality of the bearing vibration, noise, quality and other specific requirements of the bearing to be checked.

Ball bearing vibration and noise reduction technology to improve its process equipment

At present, China deep groove ball bearing and seal products advanced internal structure parameters are almost identical, but such products in China vibration and noise levels are very different with foreign products, mainly in the manufacturing and working conditions factors. From the bearing industry point of view, condition factor can be solved reasonably requested by the host, and how to reduce the vibration caused by the manufacturer and the noise factor is the bearing industry must be addressed.

Many domestic and experiments show that: cage, ring, ball bearing vibration processing quality for different degrees of impact, where the processing quality ball bearing vibration impact on the most obvious, followed by processing quality rings, the most important influence factors and the ferrule ball roundness, waviness, roughness, surface bump and other injuries.

Ball products of the most prominent problem is the discrete vibration large, severe surface defects (single point, cluster points, pits, etc.), although the surface roughness, size, shape, the error level is not lower than the outside of the circle, but the co-sets After the bearing vibration value is high, and even produce different sound, the main problem is the waviness no control (no standards, no suitable test and analysis equipment), with an indication of poor vibration machine, grinding wheel, grinding disc, coolant, process parameters are problematic ; the other hand to improve the management level, to avoid the bump wounds, scratches, burns and other machines of any quality problems.

For the rings, the most serious impact of bearing vibration is channel waviness and surface roughness. For example, small and medium deep groove ball bearing inner channel roundness greater than 2μm, the bearing vibration will have a significant impact, both inside and outside the channel waviness greater than 0.7μm, the bearing vibration value increases with the waviness of the channel serious gouges Vibration can rise more than 4dB, and even different sound.

Both balls or rings, waviness produced in the grinding, although Superfinishing waviness can improve and reduce roughness, but the most fundamental measure is to reduce the ultra-fine grinding process of waviness, to avoid randomness bump hurt, there are two main measures:

First, reduce the rolling surface vibration when ultra-fine grinding, get a good surface finish shape accuracy and surface texture quality in order to reduce vibration, grinding super machine must have good vibration resistance, bed and other important structural parts with vibration absorption, ultra- Whetstone fine machine oscillating system has a good anti-vibration performance; improve grinding speed, grinding abroad commonly used outer raceway 6202 60,000 spindle, grinding speed 60m / s or more, domestic general much lower, mainly due to the spindle and main bearing performance limitations. In high-speed grinding, grinding force is small, thin grinding deterioration is not easy to burn, and can improve the precision and efficiency, low noise ball bearing great influence; spindle stiffness and movement speed characteristics of the low-noise ball bearing a great influence on the grinding vibration, the higher the stiffness, grinding speed on the grinding force change, the less sensitive to vibration grinding system smaller; improve spindle bearing support stiffness, random balancing technology to improve the grinding spindle vibration sex. Foreign grinding vibration velocity (eg Gamfior) is approximately one-tenth of the domestic general spindle; improve cutting and grinding wheel dressing Whetstone quality is essential. China's current wheel Whetstone main problem is poor uniformity organizational structure, seriously affecting the ultra-low-noise ball bearing grinding machining quality; sufficiently cooled, improve filtering accuracy; improve the feed to the system fine resolution, reduce the feed inertia; reasonable wear ultra-processing process parameters and machining processes are factors that can not be ignored, grinding amount to small, strictly geometric tolerance, small diameter ball bearings should not use Superfinishing, coarse grinding super not be separated to ensure good surface quality.

Second is to improve machining plane precision grinding and superfinishing process reduces error reflection of the outer end face grinding and super positioning reference during processing. The channel diameter ultra-fine error reflection on the ditch by OD grinding, grinding on the ditch ditch super error reflection indirect transitive. If the workpiece in the transfer process produces bump injury, will be directly mapped to the raceway complex machined surface, the impact of bearing vibration. So you must take the following measures: improve the positioning reference surface shape accuracy; processing passes smoothly and without a bump hurt; rough allowance form and position errors can not be too large, especially in the remaining amount is small, too large error will cause the final grinding and ultra-fine close to the final shape accuracy has not improved the quality requirements, seriously affecting the processing quality consistency.

Slewing ring in the course of maintenance

slewing bearing use there will be some problems, the following Xiaobian to introduce you to slewing in use and maintenance.
    1, the receipt of the product should be enabled depending on the working conditions and re-filled with new grease.
    2, according to the different types of slewing bearings, slewing bearings should be greased regularly,
    3, the use of the process should be regularly cleared slewing bearing surface debris, check the slewing ring seal is aging, cracking, breakage or detachment, if one of them happens, seals should be replaced to prevent debris entering the inner raceway and grease loss, replacement grease should be applied accordingly to avoid rolling elements and raceways nap stuck or rusted.
    4, because in the course of comprehensive factors, the user can choose according to their own specific situation best grease
    7, slewing ring in use, not use water erosion slewing ring and avoid the water into the raceway caused by rust; hard to prevent foreign objects approaching or entering the mating area, so as to avoid tooth injury or unnecessary trouble.

Slewing definition and basic structure

slewing bearing in the real industrial applications is very wide, known as: "the machine joints" is required between two objects in relative rotary movement, and the need to bear axial force, radial force, overturning moment of machinery necessary and important driving originals. With the rapid development of the machinery industry, slewing ring in the ship's equipment, engineering machinery, light machinery, metallurgical machinery, medical equipment, industrial robots, tunnel boring machines, rotary stage lighting industry has been widely used.
    Slewing usually worm, slewing ring, shell, motor and other parts. As the core components using slewing, it can withstand the axial force, radial force, overturning moment. Its many forms, but basically similar structure and composition.

Rolling type selection

Rolling type selection Abstract: China's CNC machine tool industry, urgently develop mechanical components function classes commonly used English: processing methods Yantai Universal Group launched CNC turret high speed steel smelting MSC.ADAMS an MPV based on improved handling and stability analysis of one kind New high-precision mold material commonly used in Beijing advent R14 system variable is set skill vigilance "NC Education" overheating EDM discharge mechanism of TC4 titanium alloy combined machine tools and automatic line technology trends guru's skills can not be lost with the SiAlON ceramic tool efficient milling of cast iron Yangzhou University successfully developed non-circular rings CNC lathe programming source curve quarter ellipse What is CAD? Can compensate for wear of the cutting edge is not shovel tooth milling cutter design and manufacture of high-efficiency small lathe features Japanese VB-based environment shaper cutters CADProCAM - professional multi-axis CNC machining positioning error differential bearing life calculation method to choose the type of basic role of contact with basic concepts of relative deformation term life of a rolling bearing a gasket material appeared a sign of fatigue propagation relative to the other before a washer washer rpm reliable bearing life and reliable operation of a group of nearly the same conditions on the same bearing expect to achieve than the specified percentage of single bearing life reliable bearing service life of more than required load bearing washer relative probability.

(A) the basic concepts and terminology

A life

Means a set of bearings, one ring (or washer) or rolling of the material appeared before the first signs of fatigue propagation, a ring (or washer) relative to the other ring (or washer) the number of revolutions.

2, reliability (ie, the reliability of bearing life)

Refers to a group of operating under the same conditions, nearly the same expected bearing life reaches or exceeds the specified percentage. The reliability of a single rolling bearing that meet or exceed the lifetime probability.

3, static load

When the bearing ring or gasket when the relative rotational speed is zero (or the thrust bearing to the heart) or when the direction of the rolling element raceway when no motion (linear bearings), the load acting on the bearing.

4, static and dynamic load

When the bearing ring or gasket when the relative rotation (to the heart or thrust bearings) or when the roll bearings element in the rolling direction of movement (linear bearings), the load acting on the bearing.

5, rated life

Radial or axial basic dynamic load rating Basic dynamic load rating based on the life of the predicted value.

6, the basic rating life

Reliability associated with 90% of rated life.

7, the radial basic dynamic load rating

Means a set of rolling bearings can withstand the constant imaginary radial loads, loads in the basic rating life of one million rpm. The single row angular contact bearings, this load causes the bearing rings to each other is purely radial displacement is generated between the radial component of the load.

8, the axial basic dynamic load rating

Refers to the hypothetical role of the center in a constant bearing axial load bearing loads in the basic rating life of one million rpm.

9, radial (or axial) equivalent dynamic load

Refers to a constant radial load (or central axial load), the load, the rolling bearing having the same load of the actual life.

10, radial (or axial) Basic static load rating

Means with a rolling body raceways, and the total amount of permanent deformation corresponding radial static load (or the central axis of the static load). If at zero load, roller and raceway (roller bearing) is assumed to be normal or bus (line contacts) when the maximum contact stress, the rolling element and raceway contact produces a total permanent deformation of the rolling element diameter of 1/10000. For single row angular contact bearings, radial load rating of the bearing rings relative to each other due to pure radial displacement of the radial component of the load.

11, radial (or axial) Static equivalent load

The radial static load (or central axial static load) causes the maximum stress by rolling element and raceway contact at the total amount of permanent deformation resulting from the actual load conditions the same as the total amount of permanent deformation.

Single row angular contact ball bearings and double row angular contact ball bearings

Single row angular contact ball bearings and double row angular contact ball bearing Abstract: ultra-high-speed milling Ways What fuse, its role is to what? pro / e part accuracy modify Haoke welding stress relieving equipment in natural gas project on the application of expert systems MCE Cyclone content selection CNC machining high precision machining techniques and tools shank system selection three good technology extrusion die Eight new technologies upcoming CNC servo system performance tools to explore Taiwan Factory call up profits will ascribed CNC milling technology perspective advanced measurement technology and new trends in the correct milling tooth spur gear to ensure proper planing point Zatan class machine - fast curing rubber broaching Introduction Technical R1-00 automatic feeding tipping rules CNC EDM wire cutting in plastic processing application method and machining centers CNC Troubleshooting Q digital oscilloscope using a mold manufacturing high-speed cutting tools contact bearing load bearing system can be configured to represent this installation code contact ball bearings ball retainer inner integral outer radial load axial load Axial load speed work stably single contact ball bearings can withstand an axial direction load bearing radial load rolling loads radial load is not the same radial plane generates an internal axial force component must be installed in pairs using a ..

Angular contact ball bearings 70000 type, and from the outer ring, inner ring, balls, cage. Can support radial load and axial load can also be subject to pure axial load, at higher speeds and stable work. Single row angular contact ball bearings can withstand axial load in one direction. Such bearings under pure radial load, due to the rolling load line and not in the same line of action of the radial load radial plane, an internal axial component, it must be installed in pairs.

A single row angular contact ball bearings Single row angular contact ball bearings have the following structure:

(1) Separate angular contact ball bearings

This bearing the code S70000, its outer ring raceway side did not lock port, with the inner ring, cage, Gang ball component separation, which can be installed separately. Such are mostly less than 10mm diameter miniature bearings for gyro rotors, micro-motors for balancing, noise, vibration, stability requirements are high device.

(2) non-separable angular contact ball bearings

These bearings have a lock ring channel mouth, so the two can not be separated circles. At a contact angle is divided into three types:

① contact angle α = 40 °, applicable to withstand large axial load;

② contact angle α = 25 °, used for precision spindle bearings;

③ contact angle α = 15 °, and more for larger sized precision bearings.

(3) arranged in pairs of angular contact ball bearings

Arranged in pairs of angular contact ball bearings for both radial and axial load settings, they can withstand pure radial load and axial load in either direction. Such bearings by the manufacturer according to certain pre-load requirements, matching pairs, available to users. When the bearing is installed on the machine after fastening, completely eliminating the bearing clearance, and to outline the ball is preload rings and state, thus increasing the combined bearing steel.

Arranged in pairs of angular contact ball bearings, there are three different configurations Type:

① back to back configuration, the post code for the DB (eg 70000/DB), this configuration of the steel better withstand the overturning moment of the performance is good, the bearings can withstand axial load;

② face configuration, the post code for the DF (eg 70000/DF), this configuration of the rigidity and the ability to withstand the overturning moment as DB configuration form, bearings can withstand axial load;

③ series configuration, post code for DT (eg 70000/DT), this configuration can also be supported in the same place in series of three or more bearings, but can only bear axial load in one direction. Generally, to balance and limit the axial displacement, the other bearing at the other direction to be installed to withstand the axial load bearing.

In addition, there is a pair for any single row angular contact ball bearings. This bearing special processing, can be two back to back, face to face or two tandem two other arbitrary combinations, paired combination of axial clearance can be selected, post code CA represents a smaller axial clearance, CB represents the axial clearance is moderate, CC represents a larger axial clearance.

Universal paired bearings can also be configured to use requirements have preloaded bearings, and after-code GA, GB, GC representation. GA represents paired with smaller preloaded; GB represents paired with moderate preloaded; GC indicates a greater paired preloaded.

2 double row angular contact ball bearings

Double row angular contact ball bearings can be characterized by both radial and axial load of joint load, limiting both the axis of the axial displacement. Compared with the two-way thrust ball bearings, this bearing high speed limit, the contact angle of 32 °, rigid, and can withstand the overturning moment, widely used in cars in the front wheel hub (some models also use the same size double row tapered roller bearings).

Double row angular contact ball bearing structure has four variants:

(1) A type of bearing outside diameter less than or equal to 90mm standard design. Non-loaded ball gap, so they can withstand the equivalent of two-way axial load. Using lightweight glass fiber reinforced nylon 66 cage, bearing temperature rise is small.

(2) A type of bearing outside diameter greater than 90mm standard design. Side of the ball gap, with a pressed steel cage or solid brass cage.

(3) E-type structure is enhanced, the side with filling slots that can hold more of the ball, so the higher carrying capacity.

(4) sides with a dust cover type and sides with a ring-type A-type and E-type design designed double row angular contact ball bearings can be on both sides with a dust cover (non-contact) or seal (contact ). Sealed bearings are filled with rust inside lithium grease, operating temperature is generally -30 ~ +110 ℃. No further lubrication during use, should not be heated before installation should not be cleaned.

Double row angular contact ball bearing installation should pay attention, although bearings can withstand axial load, but if there is one side of the gap when the ball should be careful not to let the main axial load through the notched side of the gutter.

The use of bearings

Rolling bearings are precision components, and its use should also be carefully carried out accordingly. No matter how high-performance bearings, if used improperly, it will not get the expected performance. Note the use of the relevant bearing as follows:
1, to keep the roll bearings and the surrounding clean.
Even the eyes can not see small dust, will give adversely affect the bearings.
2, carefully use.
Bearing in use will have a strong impact suffered bruises and indentation, cause of the accident.
3, using the appropriate operating tool.
Avoid the existing tools instead, you must use the right tools.
4, pay attention to corrosion of bearings.
Operation will become rusty hands sweat reason to pay attention to clean hands operation, the best possible wear gloves.

Bearing Installation

Bearing is installed correctly, affecting accuracy, longevity, performance. Therefore, the design and installation of the bearing assembly department to be adequately studied. I hope to be in accordance with the operating standards for installation. The projects are usually operating standards are as follows:
1, cleaning bearings and related components
2, Check the connected components of size and precision machining conditions
3, the installation
4, check the cross bearing installed
5, the supply of lubricant
Recommend the use of open bearings package just before installation to prevent rust.
Bearing installation method due to the bearing structure, with the condition varies, in general, due to multi-axis rotation, so the inner ring needs interference fit. Cylindrical bore bearings, multi-pressed into the press or by thermal loading method. Cone of the occasion, mounted directly on the tapered shaft or sleeve installation. Most types of bearings are generally installed using the following method:
1, pressed into the press method
2, the thermal loading methods
3, the cooling method
In addition, also the use of advanced electromagnetic induction heating device for installation in a short time without fire, uniform heating oil, cleaner and more efficient installation. Please refer to the Division I bearing heater bearing removal bearing removal, is regular maintenance, when bearing replacement. After the demolition, if you want to continue to use or need to check the bearing of the state, its removal and installation should be carried out as carefully. Careful not to damage the bearings and the parts, especially the interference fit bearing removal, the operation is difficult, it is necessary to pay attention to. Bearing removal can be used presses, drawing fixtures, extrusion screws, induction heating equipment, hydraulic and other several ways.

Bearing operation precautions

Listen checks the status of the machine operation and prepare a thorough inspection plans has become increasingly important. Among them, the bearing is the focus of attention, because it is the most important of all the machines rotating parts. Use hearing to identify irregular operation is a very common method, if the bearing is in good operating condition, it emits low whining sound; if a sharp hissing sound, squeaking sound, and other irregular sounds, usually the bearing is in poor running condition. How to listen? The old method: Use a stick or screwdriver against the bearing housing and the other end affixed to live ears; advanced methods: the use of advanced equipment, such as electronic monitoring equipment status, pre-diagnosis of the functioning of the bearing.
Touch
If the roll bearings temperature over 125 ℃ long-term operation, will reduce bearing life, high temperature bearings are often expressed in an abnormal condition, causing high temperatures reasons: lack of lubrication or excessive lubrication, the lubricant containing impurities, the load is too large, bearing damage, lack of space, and seal friction generated by the high and so on. Therefore, detection of bearing temperature is necessary, either by itself or other important measuring bearing parts. The old way is to touch the bearing housing temperature sensation, now by means of a temperature probe, which can accurately measure the temperature of the bearings and displayed in order to effectively take protective measures.
Observation
If you get a good bearing lubrication and proper debris and moisture barrier, which means that there should be no oil seal wear. However, the best in the open bearing box to visually inspect the bearings and regularly check seals. Check the status near the bearings seals to ensure that they are sufficient to prevent the hot liquids or corrosive liquids or gases penetrate along the bearing axis. Protection ring and labyrinth seals should be coated with grease to ensure maximum protective effect, seal If wear should be replaced soon.

Deep groove ball bearing vibration noise root causes

Deep groove ball bearing vibration and noise on the formation mechanism of domestic and international aspects of the control of vibration and noise, there are two different approaches. Bearing vibration mainly from two sources:
One bearing bearing caused by external incentives inherent vibration, referring to the bearing inner ring, outer ring, rolling elements and cage the natural vibration.
Two deep groove ball bearing due to contact between moving parts forced vibration caused by collision, such as ball rolling is not an ideal sphere, inside and outside the channel contact point trajectory is not a perfect circle (roundness, waviness), the raceway not the ideal smooth surface (roughness) and the rolling elements and cage in motion collision and lubricants in the forced vibration caused by impurities, vibration and sound are closely related, but slightly different sense, That is the sound originated in vibration, acoustic vibrations in the air is transmitted to humans by the feeling of hearing, so the ultra-high frequency vibrations are inaudible. However, if the receiver and the sound vibration characteristics of the receiver is the same, two received signals received relevant to the whole, according to this view, controlling vibration or noise control can play the same effect. And because the vibration control is simple, so home and abroad priority control vibration to ensure product quality. Therefore, for the general bearing, it is recommended to concentrate its limited human and financial resources to do a good job of bearing vibration control. Quality standards should not separate the noise, of course, according to foreign experience for a special bearing products, such as computer hard drives, CD recorder drive system bearings, vibration assessment is not easy to use, can develop criteria to assess noise measurement method .

Seal type deep groove ball bearings

Many deep groove ball bearing sealing problems mainly ineffective drain grease and dust, etc., in a nutshell is poor sealing performance; non-contact seals no big problem, the main problem is multi-contact seals. What are the causes it?
Main bearing seal structure is relatively backward. Seal structure lies in the rotary member of the seal groove and the sealing cap sealing lips. Sealed general there are three forms, one does not actually slot; second is a small inner diameter, there is a step; third is a complete seal groove.
Sealing lip with a single and double lip of the points, to improve the sealing effect, we believe that the sealing lips should be developed and groove seal structure, because this form of contact seals and labyrinth seals combined sealing effect is better, but the process is complicated, higher cost.
In the modern enterprise in the pursuit of cost-premise, as far as possible the pursuit of double lip seal and groove seal structure deep groove ball bearings, but conditions were not under seal structure can only produce a general, after all, is now a large domestic use part of the sealing structure in general, and the sealing structure by many users.

Crossed roller bearings how to adjust in order to achieve the best results

Bearing is the basis of the quality of its own, through the bearing steel, cross roller bearing and crafts strict customs, the production out of the bearing quality is absolutely the best. But why will still see some of the questions about the damage it? This is mainly because the use of inattention caused, not seen since the bearing itself quality problems caused.
Through a combination of bearing failure and deterioration, performance status parameters to determine and predict the reliability and performance of the bearing, the site of the abnormal situation, causes and degree of risk identification and judgment to decide restoration and improvement of the integrated technology. Therefore, the bearing fault diagnosis technology is not a simple fault detection (or monitoring) technology, nor is it a simple point inspection instrumentation. Correctly, quickly and effectively signal acquisition, data processing, manual or automatic identification and judgment. In order to determine the scientific repair cycle, the mechanism should be based on various types of failure, fatigue, wear life tests and estimates necessary.
1, the shaft and the bearing housing tolerances choice and control: after pressure block has no bearing swivel sense of flexibility. If significant rotation is not flexible, then the shaft size is too large, and decreased tolerance. Such as bearings pressed into the hand after the obvious "imperfections" in a certain sense the steering shaft, it may be too round shaft or shaft tolerance is not good. A good shaft and bearing tolerances in the control room, so it should be controlled roundness.
2, the bearing assembly mode: Because bearings are precision products, such as improper assembly, easy to damage the channel bearings, resulting in bearing damage. Bearing in the assembly, there should be a special mold, can not beat, pushing the axial force can only be a small circle, the press force only when the circle. Assembly requires the use of pneumatic or hydraulic crimping die down when outside the country level, if the channel slope will lead cross roller bearing damage due to power, leaving the production of bearing guide ring.
3, the assembly to prevent foreign bodies: Bearing mounted rotor balancing is very susceptible to the iron homeostasis Before installing the bearings, so it is best to do balancing. Bearing in the conference room to put some oil or grease lubrication, but operators often difficult to control the amount of oil or grease the bearings if the plot to stay indoors, it's easy to rotate along the axis cross roller bearing. Bearing chamber is preferably not coated with oil or grease, such as non-coated control, without bearing to stay indoors.
4, paint rust prevention: paint rust is featured in a sealed motor, in the General Assembly multiple motors sounds good, but after a period of storage, the motor becomes a very unusual sound, remove the bearing severe rust. Many manufacturers will be considered before the cross roller bearing problems, now the main electrical plant has been aware of the problem of varnish. The main problem is that out of the insulating paint volatile acid at a certain temperature, humidity, corrosion and protection of metals, formation of corrosive substances, channels skf bearing cause corrosion damage. The only problem now is to choose a good varnish, dry air for some time after assembly.
5, the bearing life is the manufacture, assembly, use is closely related to every aspect must be made in order to make the best functioning of the state of the bearing, thus extending the service life of cross roller bearings.

Crossed roller bearings installed basic steps and use of environmental requirements

Bearing must be installed in a dry, clean environment conditions. Should be carefully checked before installation of shaft and housing mating surface, convex shoulder face, grooves and connecting surface processing quality. All surfaces must be carefully cleaned the mating connector and remove burrs, casting Ex unworked surface must be sand.
Bearing installation should be preceded with gasoline or kerosene to clean and dry before use, and to ensure good lubrication, bearings are generally lubricated with grease, oil lubrication can be. Lubricated with grease should be used free of impurities, oxidation, rust, and other superior performance extreme pressure grease. Grease filling is crossed roller bearings and bearing housing volume 30% -60%, not too much. With sealing structure of the double row tapered roller bearings and water pump bearing grease has been populated, the user can directly use, can no longer be cleaned.
Bearing installation must be on the circumference of the ring face exert equal pressure, push the ferrule may not be a direct hit with a hammer prime tool bearing face, so as not to damage the bearings. In the case of a small amount of interference, it can be pressed at room temperature with sleeve bearing ring face, beating with a hammer sleeve, the sleeve will be pressed into the ring balanced. If large quantities of installation, can be used hydraulic press. Press-fitting, should ensure that outer end face and the housing shoulder, inner end face and the shaft shoulder pressed, does not allow a gap.
First, bearing installation, you should use the appropriate measuring tool according to design drawings on technical requirements, check the shaft and housing bore and the relevant parts of the processing quality (such as dimensional accuracy, shape accuracy and surface roughness, etc.).
Second, the shaft and bearing assembly housing bore any bumps on the surface, burrs, rust or solid particles (such as debris, sand, mud), etc. exist, not only will the bearing installation difficulties and make the installation location is not correct, and solid particles as falling within a rolling start grinding effect, when the bearing rotates rubs or scratches will cross roller bearings work surface, so must be carefully checked before installation, if there is such defects should be corrected. For example, by removing burrs oil filed, raised bump marks, rust and polish with fine emery cloth, and if the cleaning of solid particles, dirt, etc..
Third, the mounting surface should be clean with gasoline, kerosene, toluene or xylene solution to clean clean and dry with a clean rag, then coated with a thin layer of oil, so make the installation more convenient.
Four, temporary installation, open bearings package, it will be immersed in the gasoline and other liquid gently rotated by hand, to ensure that cage, rolling element and raceway surface to be cleaned thoroughly cleansed encapsulated oil.
Five, cleaning a large cross roller bearings, the first with a temperature of 90 ~ 100 ℃ hot oil poured hot oil melted in the package, but the mouth does not drop crumbs seamless tool to dig the net all the old oil, then pour hot minutes then rinse with kerosene to oil, gasoline and then finally cleaned again. After clean washing, gloves should be worn thin the bearing on the work bench clean cloth or paper to dry.
Sixth, pay attention to this Act is not available with sealed bearings cleaned, sealed inside should remain as non-cleanable.
When a large amount of interference, can be oil bath heated by induction heating or crossed roller bearings way to install the heating temperature range is 80 ℃ -100 ℃, the maximum can not exceed 120 ℃. Meanwhile, the application of a nut or other appropriate methods tighten the bearing to prevent the bearing cooling after leaving the ring widthwise shrinkage gap between the shaft shoulder.
Finally, it should be installed bearing clearance adjustment. Clearance values ​​should be based on the use of different conditions and the amount of interference with the size of specifically identified. Necessary, should be tested to determine. cross roller bearing and water pump bearing has been adjusted at the factory clearance, installation without further adjustment.
Bearing rotation test should be carried out after installation, first for rotating shaft or bearing housing, without exception, then in power for no-load, low speed, then gradually increase as the functioning of the rotation speed and load, and to detect noise, vibration and temperature , abnormal, should stop and check. Normal operation test before delivery.