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.
2013年8月23日星期五
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.
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.
2013年8月22日星期四
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.
(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.
2013年8月10日星期六
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.
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.
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.
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