Typically, if used correctly deep groove ball bearings, can be used to its maximum life so far. If not used correctly will have an unexpected injury prematurely. And fatigue life of this relatively early damage, malfunction or accident we call quality use limit. Multiple causes for installation, use, lubrication on the non-standard, or other foreign matter from outside intrusion.
Deep groove ball bearing damage on the state, such as: bearing rings, ribs card injury, mainly due to lack of lubricant, not suitable for oil discharge structure defects, the intrusion of foreign bodies, bearing misalignment, shaft deflections is too large, or both the above reasons.
Therefore, only the investigation bearing damage, injury is difficult to know the real reason. However, if you know the bearing using mechanical, conditions of use, bearing the surrounding structure, to understand the situation before and after the accident, combined with state of the bearing damage, and several reasons, we can prevent similar incidents from recurring.
deep groove ball bearing vibration of the bearing damage is very sensitive, such as peeling, dents, rust, cracks, wear, etc. will be in rolling bearing vibration measurement reflected, therefore, through the use of special bearing vibration measurements (frequency analyzer, etc.) can be measure the size of the vibration, can not be inferred by the frequency of abnormal circumstances. The measured values due to the conditions of use of rolling bearings or sensor installation location is different, so each machine needs prior to analysis and comparison of the measured values determined criteria.
Deep groove ball bearing temperature, generally room temperature outside of the bearing can be inferred, it can be measured directly using the hole bearing outer ring temperature, which is more accurately measured.
Typically, the temperature of rolling bearing operation began to rise slowly as 1-2 hours after reaching steady state. The normal temperature because of the machine bearing the heat capacity, heat capacity, speed and load are different. If lubrication, improper installation, the bearing temperatures will soar, there will be high, then you must stop running, check the disassembly repair. Conditional thermal sensor can be used at any time to monitor the bearing operating temperature, and to achieve the temperature exceeds a predetermined value or when the alarm automatically stops running to prevent burning shaft accidents.
2013年8月9日星期五
Sealed deep groove ball bearings with grease on one side only
We use the process of deep groove ball bearing, bearing seals occasionally pry open the lid, this time we will find that while there is some bearing full of grease, while the other side there is no grease; while some bearing on both sides evenly fat distribution, especially the high price of the bearing, this is what causes it?
We know that the bearing during operation is the need to grease and rust, especially sealed deep groove ball bearings, grease the bearing can not be high-speed operation, will greatly shortened life expectancy. The bearing in the production process is a process up to a, the bearing inner ring and the balls, the cage is assembled, the first thing is to wash, rinse after the pressure side of the seal cover, and then flip over bearing, plus fat (Average plus the bearing interior volume is 30% ~ 35%), and then a cover.
Here we found, sealed deep groove ball bearing with one side in the production process are not added fat, grease applied to only one side only; if both sides, then add oil, bearing the manufacturing process, the more of a process, so the production efficiency will be reduced.
At this time someone will ask, why would some bearing grease on both sides of it? If the bearing grease seals on both sides, this one is the price is relatively high, and the other is used over the bearing. Why do you say? This is the high price of bearings are generally better quality, this is the result of deep groove ball bearing side full inspection, and that is to go through the rotating bearing test, after the rotation bearing grease on the inside of a uniform distribution; another is bearing After using, used, oil will certainly be evenly distributed.
So says the new deep groove ball bearings with grease on both sides of only one side while the other side is not normal, users do not worry, just take a few turns bearings, or turn a few minutes to get the machinery above, bearing grease on the inside of the uniform rotation , do not affect the use.
We know that the bearing during operation is the need to grease and rust, especially sealed deep groove ball bearings, grease the bearing can not be high-speed operation, will greatly shortened life expectancy. The bearing in the production process is a process up to a, the bearing inner ring and the balls, the cage is assembled, the first thing is to wash, rinse after the pressure side of the seal cover, and then flip over bearing, plus fat (Average plus the bearing interior volume is 30% ~ 35%), and then a cover.
Here we found, sealed deep groove ball bearing with one side in the production process are not added fat, grease applied to only one side only; if both sides, then add oil, bearing the manufacturing process, the more of a process, so the production efficiency will be reduced.
At this time someone will ask, why would some bearing grease on both sides of it? If the bearing grease seals on both sides, this one is the price is relatively high, and the other is used over the bearing. Why do you say? This is the high price of bearings are generally better quality, this is the result of deep groove ball bearing side full inspection, and that is to go through the rotating bearing test, after the rotation bearing grease on the inside of a uniform distribution; another is bearing After using, used, oil will certainly be evenly distributed.
So says the new deep groove ball bearings with grease on both sides of only one side while the other side is not normal, users do not worry, just take a few turns bearings, or turn a few minutes to get the machinery above, bearing grease on the inside of the uniform rotation , do not affect the use.
2013年7月15日星期一
Oil spill caused by the bearing ring hair treatment
Bearing due to frequent use, and oil will reduce bearing life, then how do we clear bearing on the oil it? Here to teach you an easy method of clearing the oil on the bearings.
Soft dry oil or rust paste hardened bearing should immersed in 100 ℃ ~ 200 ℃ hot oil, use pliers bearings, bearings with a hair brush oil on a clean. Soft dry oil or rust cream is heated to 100 ℃ ~ 200 ℃ to melt easily washed from the cracks in the bearing out. Sometimes just the bearing in the oil repeatedly shaking. Oil will be flowing away from the gap.
In cleaning bearings, spherical bearings to the heart, it should put the ball, bead frame, the inner from the outer lateral transfer out and then immersed in hot oil, the short cylindrical roller bearing roller cleaning when they should, bead frame, inner and outer disengage.
(A) the bearing raceway raceway sound and control the sound is running when the bearing, the rolling body raceway rolling issued a slippery continuous sound, all bearing the unique occur basic sound . Sound that is generally bearing raceway sound with other sounds. Ball bearing raceway sound is irregular frequencies above 1000Hz, its main frequency does not change with the speed, but the total sound pressure level increases with the speed acceleration. Raceway sound big INA bearings, the roller with the sound pressure level decreases with increasing viscosity; while the sound of a small roller bearings, and its level increased in viscosity to about 20mm2 / s or more, by reducing the to be increased. Greater rigidity of bearing raceway total sound pressure level is lower. If the radial clearance is too small, the total sound pressure level raceway and the main frequency will decrease as the radial clearance increases dramatically. Control raceway sound methods are: selection of low-noise bearings that waviness small bearings, judicious selection of the conditions of use. Raceway sound often affect the entire mechanical noise reduction raceway sound can reduce the overall mechanical noise.
(2) the impact of rolling sound and control models of ball bearings or larger cylindrical roller bearings in pure radial load low speed, the centrifugal force due to rolling body is small, in a non-load zone of rolling element will Shock cage or raceway and noisy. However, as the speed increased, the sound will disappear. Impact on the rolling sound control methods are: appropriate to reduce the radial clearance, the use of reasonable structure supple material of the bearing cage.
(3) bearing jarring sound and control jarring sound is a cylindrical roller bearings on all occasions that may occur harsh sound of metal friction occurs mostly in grease lubricated bearings in larger models, and in the base oil properties more susceptible to deterioration of grease, oil lubrication in almost no time. In addition, more prone to winter, when subjected to pure radial load, radial clearance prone to big occasions, and with models of different sizes, at a particular speed range prone to both occur consecutively will appear intermittently. Outer ring raceway take special processing methods to prevent the emergence of creaking, if necessary, use this bearing, or appropriate to reduce the radial clearance, use grease with excellent performance and increasing the rigidity of the bearing mating parts .
Soft dry oil or rust paste hardened bearing should immersed in 100 ℃ ~ 200 ℃ hot oil, use pliers bearings, bearings with a hair brush oil on a clean. Soft dry oil or rust cream is heated to 100 ℃ ~ 200 ℃ to melt easily washed from the cracks in the bearing out. Sometimes just the bearing in the oil repeatedly shaking. Oil will be flowing away from the gap.
In cleaning bearings, spherical bearings to the heart, it should put the ball, bead frame, the inner from the outer lateral transfer out and then immersed in hot oil, the short cylindrical roller bearing roller cleaning when they should, bead frame, inner and outer disengage.
(A) the bearing raceway raceway sound and control the sound is running when the bearing, the rolling body raceway rolling issued a slippery continuous sound, all bearing the unique occur basic sound . Sound that is generally bearing raceway sound with other sounds. Ball bearing raceway sound is irregular frequencies above 1000Hz, its main frequency does not change with the speed, but the total sound pressure level increases with the speed acceleration. Raceway sound big INA bearings, the roller with the sound pressure level decreases with increasing viscosity; while the sound of a small roller bearings, and its level increased in viscosity to about 20mm2 / s or more, by reducing the to be increased. Greater rigidity of bearing raceway total sound pressure level is lower. If the radial clearance is too small, the total sound pressure level raceway and the main frequency will decrease as the radial clearance increases dramatically. Control raceway sound methods are: selection of low-noise bearings that waviness small bearings, judicious selection of the conditions of use. Raceway sound often affect the entire mechanical noise reduction raceway sound can reduce the overall mechanical noise.
(2) the impact of rolling sound and control models of ball bearings or larger cylindrical roller bearings in pure radial load low speed, the centrifugal force due to rolling body is small, in a non-load zone of rolling element will Shock cage or raceway and noisy. However, as the speed increased, the sound will disappear. Impact on the rolling sound control methods are: appropriate to reduce the radial clearance, the use of reasonable structure supple material of the bearing cage.
(3) bearing jarring sound and control jarring sound is a cylindrical roller bearings on all occasions that may occur harsh sound of metal friction occurs mostly in grease lubricated bearings in larger models, and in the base oil properties more susceptible to deterioration of grease, oil lubrication in almost no time. In addition, more prone to winter, when subjected to pure radial load, radial clearance prone to big occasions, and with models of different sizes, at a particular speed range prone to both occur consecutively will appear intermittently. Outer ring raceway take special processing methods to prevent the emergence of creaking, if necessary, use this bearing, or appropriate to reduce the radial clearance, use grease with excellent performance and increasing the rigidity of the bearing mating parts .
Do need to pay attention to the daily details of bearing maintenance
First, touch
Bearing temperature is often expressed in unusual circumstances. Harmful to the bearing temperature and the lubricating oil. Sometimes, bearing overheating can be attributed to the bearing lubricant and bearing over 125 ℃ temperature in the long run, reduce bearing life, resulting in high bearing the following reasons: lack of lubrication or excessive amount of lubricating oil, lubricating oil containing impurities , heavy duty, bearing damage, lack of space, and seal friction generates heat. Therefore, continuous monitoring bearing temperature is necessary, whether the measure or other important part of the bearing itself. If you are in the business situation has not changed, any change in temperature may be faulty.
Bearing temperature measurement can often help thermometer can accurately measure the temperature of the bearing, and in accordance with degree. Important bearing when it is damaged, it will cause equipment downtime, therefore these bearings should preferably be equipped with a temperature probe. Under normal circumstances, the bearing lubrication and lubricated natural temperature rise and for one day or two.
Second, observe
If you have a good lubrication and bearing right debris and moisture barrier that seals should not wear, but preferably in the open bearing housing to visual inspection and periodic inspection bearing seals, bearing seals around the examination conditions, ensure that sufficient to prevent liquids or corrosive liquids or gases from entering the bearing along the axis. Protection ring and labyrinth seals should be coated with grease to protect its maximum protection. Seals if worn should be replaced soon. Oil sealing function in addition to the bearing to prevent the magazine, and the other function is to keep lubricated bearing housing. If the seal leaks immediately check the seal has been worn or loose oil block. Leak phenomenon may be caused by loose fitting of the bearing box or because adding too much lubricant to form a mixed and leak detection, automatic lubrication system to ensure that the correct amount of lubricant and to examine whether or black, if such a phenomenon, usually say that the lubricant contains magazines.
Third, listen
Using auditory recognition irregular operation is very common approach. For example, with electronic stethoscope to listen to part of the abnormal noise is experienced by method of operation. If it is in good working condition of the bearing will make a low hum of voices. If a sharp hiss, squeaks and other irregular sounds, commonly referred to as the poor working conditions of the bearing. Harsh creaking sound may be due to improper lubrication. Improper bearing clearance may also cause a metallic sound. Dent on the bearing outer ring track will produce vibrations and resulting smooth crisp sound. If the installation of the percussion scars will produce noise, noise will vary with the bearing speed. If there is intermittent noise, rolling element may be damaged. This sound is happening on the surface bearing the date, if the pollutants are often caused by the hissing. Severely damaged bearings will produce irregular and noise.
Bearing damage is listening to consciousness, but usually at this time has come to replace the bearings. Thus, a better way, for example, such as electronic control equipment, diagnostic bearing operating condition.
1: Current bearings are lubricated with grease, running over 1,500 hours, should be timely replacement of grease filling should be noted that the amount of oil required amount, because too little or too much grease will cause the bearing heating, Chong Yu proposed to maintain the amount of fuel in the bearing chamber volume of 1/2 to 2/3 is appropriate.
2: The use of sodium based grease motor bearing (most are of this type), this feature is to grease temperature (125 ℃), drawback is easily dissolved in water, so the lubrication pump is entirely inappropriate.
3: used for holding oil or grease containers should be clean, and usually should be sealed well, do not let dust, iron filings and other debris fell on them, so as to avoid damage to the bearings.
4: Take special note is put into use a new pump for the first time in 100 hours of operation shall be promptly replaced after grease (oil), the next to replace 1 500 hours of operation.
5: For the use of oil-lubricated bearings, the oil should be added to a predetermined position.
Bearing temperature is often expressed in unusual circumstances. Harmful to the bearing temperature and the lubricating oil. Sometimes, bearing overheating can be attributed to the bearing lubricant and bearing over 125 ℃ temperature in the long run, reduce bearing life, resulting in high bearing the following reasons: lack of lubrication or excessive amount of lubricating oil, lubricating oil containing impurities , heavy duty, bearing damage, lack of space, and seal friction generates heat. Therefore, continuous monitoring bearing temperature is necessary, whether the measure or other important part of the bearing itself. If you are in the business situation has not changed, any change in temperature may be faulty.
Bearing temperature measurement can often help thermometer can accurately measure the temperature of the bearing, and in accordance with degree. Important bearing when it is damaged, it will cause equipment downtime, therefore these bearings should preferably be equipped with a temperature probe. Under normal circumstances, the bearing lubrication and lubricated natural temperature rise and for one day or two.
Second, observe
If you have a good lubrication and bearing right debris and moisture barrier that seals should not wear, but preferably in the open bearing housing to visual inspection and periodic inspection bearing seals, bearing seals around the examination conditions, ensure that sufficient to prevent liquids or corrosive liquids or gases from entering the bearing along the axis. Protection ring and labyrinth seals should be coated with grease to protect its maximum protection. Seals if worn should be replaced soon. Oil sealing function in addition to the bearing to prevent the magazine, and the other function is to keep lubricated bearing housing. If the seal leaks immediately check the seal has been worn or loose oil block. Leak phenomenon may be caused by loose fitting of the bearing box or because adding too much lubricant to form a mixed and leak detection, automatic lubrication system to ensure that the correct amount of lubricant and to examine whether or black, if such a phenomenon, usually say that the lubricant contains magazines.
Third, listen
Using auditory recognition irregular operation is very common approach. For example, with electronic stethoscope to listen to part of the abnormal noise is experienced by method of operation. If it is in good working condition of the bearing will make a low hum of voices. If a sharp hiss, squeaks and other irregular sounds, commonly referred to as the poor working conditions of the bearing. Harsh creaking sound may be due to improper lubrication. Improper bearing clearance may also cause a metallic sound. Dent on the bearing outer ring track will produce vibrations and resulting smooth crisp sound. If the installation of the percussion scars will produce noise, noise will vary with the bearing speed. If there is intermittent noise, rolling element may be damaged. This sound is happening on the surface bearing the date, if the pollutants are often caused by the hissing. Severely damaged bearings will produce irregular and noise.
Bearing damage is listening to consciousness, but usually at this time has come to replace the bearings. Thus, a better way, for example, such as electronic control equipment, diagnostic bearing operating condition.
1: Current bearings are lubricated with grease, running over 1,500 hours, should be timely replacement of grease filling should be noted that the amount of oil required amount, because too little or too much grease will cause the bearing heating, Chong Yu proposed to maintain the amount of fuel in the bearing chamber volume of 1/2 to 2/3 is appropriate.
2: The use of sodium based grease motor bearing (most are of this type), this feature is to grease temperature (125 ℃), drawback is easily dissolved in water, so the lubrication pump is entirely inappropriate.
3: used for holding oil or grease containers should be clean, and usually should be sealed well, do not let dust, iron filings and other debris fell on them, so as to avoid damage to the bearings.
4: Take special note is put into use a new pump for the first time in 100 hours of operation shall be promptly replaced after grease (oil), the next to replace 1 500 hours of operation.
5: For the use of oil-lubricated bearings, the oil should be added to a predetermined position.
Bearing structure types on the different requirements of maintenance
1, thrust bearing angular contact ball bearing
Axial angular contact ball bearing contact angle of 60 ° commonly used general thrust angular contact ball bearings are generally two-way thrust angular contact ball bearings, mainly used for precision machine tool spindle, usually with double row cylindrical roller bearings used in conjunction, can withstand two-way axial to load, with high accuracy, good rigidity, low temperature, high speed, easy assembly and disassembly.
2, bearing deep groove ball bearings
Deep groove ball bearings in the structure of each ring has a cross-section of the equatorial circumference of the ball one-third of the continuous groove type raceway. Deep groove ball bearings are mainly used to bear radial load, but also bear certain axial load. When the bearing radial clearance increases, with the nature of angular contact ball bearings, can withstand both directions alternating axial load. With the same size compared to other types of bearings, such bearings friction, high limiting speed, high precision, user selection is the preferred bearing type. Deep groove ball bearing structure is simple, easy to use, is the largest production volume, most widely used of a class of bearings.
3, the bearing thrust tapered roller bearings
Since thrust tapered roller bearings rolling body is tapered roller, rolling in the structure of the bus and the bus were raceway washers intersect at a point bearing axis line, and thus can form pure rolling rolling surface, high speed limit in thrust cylindrical roller bearings. Features: Thrust tapered roller bearings can withstand a one-way axial load. Thrust tapered roller bearing type code 90000.
4, bearing double row tapered roller bearing structure, performance characteristics
Double row tapered roller bearings range, the maximum amount is 35 000 type, with one pair of outer and two inner ring raceway, there is an interval between the two inner circle, changing the thickness of the spacer adjustable clearance. These bearings radial load at the same time can withstand axial load in the axial bearing clearance range limit axial displacement of shaft and housing. Tapered roller bearing structural features. Tapered roller bearing type code 30000, tapered roller bearings are separable bearings. Tapered roller bearings are mainly used to bear radial load mainly radial and axial joint load. And angular contact ball bearings, bearing capacity, low speed limits. Tapered roller bearings can withstand axial load in one direction, the shaft or housing to limit axial displacement in one direction.
In order to give full play to the bearing and long maintained its proper performance, you must do a good job of regular maintenance (periodic inspection).
By appropriate periodic inspection, so that early detection of failure to prevent accidents in the first place, to improve the productivity and economic importance.
1, cleaning
Remove the bearing inspection, photography and other methods to do first with the appearance of records. In addition, to confirm the remaining amount of lubricant and lubricant samples, and then cleaning bearings.
a, bearing cleaning of rough wash and sperm washing and can be placed in the bottom of the container used metal grid.
b, coarse wash, brush, etc. used in the oil or grease removal adhesive material. At this point if rotating bearings in oil, attention and other damage due to foreign objects rolling surface.
c, sperm washing, in the oil slowly rotating bearings should be carried out carefully.
Commonly used cleaning agents for the neutral water diesel or kerosene, is sometimes necessary to use warm lye. Regardless of what kind of cleaning agent filter should always be kept clean.
Cleaned immediately after anti-rust coating on the bearing grease oil or rust.
2, check with the judge
In order to determine whether the re-use of the removed bearing should focus on checking the accuracy of its size, rotation accuracy, internal clearance and with the surface, raceway, cage and ring.
On the inspection results, may be used to bearing or bearings were judged proficient.
Determine the mechanical properties and the criteria according to the degree of importance and checking cycles vary. If the following injury, the bearings must not be reused and must be replaced.
1) bearing parts breakage and defects.
2) rolling surface raceway material peeling.
Bearing fault identification method
Not by removing checks to identify or predict the bearing in operation without failure, to improve productivity and economy are very important.
The main identification methods are as follows:
1) identified by voice
Identify needs through sound experience. Must be adequately trained to recognize bearing achieve sound and non-bearing sound. To do this, you should try to carry out this work by hand. A listening or listening rods attached to the housing can clearly hear the sound of the bearing.
2) identification of the operating temperature
This method is relatively identification method is limited to use in the operation state is not changing situations. Therefore, the temperature must be continuously recorded. Fails, only the temperature rises, there will be irregular changes.
3) to identify the state of the lubricant
The lubricant sampling and analysis, through its pollution level is mixed with foreign matter or metal powders to judge. This method does not close observation bearings or large bearings are particularly effective.
Axial angular contact ball bearing contact angle of 60 ° commonly used general thrust angular contact ball bearings are generally two-way thrust angular contact ball bearings, mainly used for precision machine tool spindle, usually with double row cylindrical roller bearings used in conjunction, can withstand two-way axial to load, with high accuracy, good rigidity, low temperature, high speed, easy assembly and disassembly.
2, bearing deep groove ball bearings
Deep groove ball bearings in the structure of each ring has a cross-section of the equatorial circumference of the ball one-third of the continuous groove type raceway. Deep groove ball bearings are mainly used to bear radial load, but also bear certain axial load. When the bearing radial clearance increases, with the nature of angular contact ball bearings, can withstand both directions alternating axial load. With the same size compared to other types of bearings, such bearings friction, high limiting speed, high precision, user selection is the preferred bearing type. Deep groove ball bearing structure is simple, easy to use, is the largest production volume, most widely used of a class of bearings.
3, the bearing thrust tapered roller bearings
Since thrust tapered roller bearings rolling body is tapered roller, rolling in the structure of the bus and the bus were raceway washers intersect at a point bearing axis line, and thus can form pure rolling rolling surface, high speed limit in thrust cylindrical roller bearings. Features: Thrust tapered roller bearings can withstand a one-way axial load. Thrust tapered roller bearing type code 90000.
4, bearing double row tapered roller bearing structure, performance characteristics
Double row tapered roller bearings range, the maximum amount is 35 000 type, with one pair of outer and two inner ring raceway, there is an interval between the two inner circle, changing the thickness of the spacer adjustable clearance. These bearings radial load at the same time can withstand axial load in the axial bearing clearance range limit axial displacement of shaft and housing. Tapered roller bearing structural features. Tapered roller bearing type code 30000, tapered roller bearings are separable bearings. Tapered roller bearings are mainly used to bear radial load mainly radial and axial joint load. And angular contact ball bearings, bearing capacity, low speed limits. Tapered roller bearings can withstand axial load in one direction, the shaft or housing to limit axial displacement in one direction.
In order to give full play to the bearing and long maintained its proper performance, you must do a good job of regular maintenance (periodic inspection).
By appropriate periodic inspection, so that early detection of failure to prevent accidents in the first place, to improve the productivity and economic importance.
1, cleaning
Remove the bearing inspection, photography and other methods to do first with the appearance of records. In addition, to confirm the remaining amount of lubricant and lubricant samples, and then cleaning bearings.
a, bearing cleaning of rough wash and sperm washing and can be placed in the bottom of the container used metal grid.
b, coarse wash, brush, etc. used in the oil or grease removal adhesive material. At this point if rotating bearings in oil, attention and other damage due to foreign objects rolling surface.
c, sperm washing, in the oil slowly rotating bearings should be carried out carefully.
Commonly used cleaning agents for the neutral water diesel or kerosene, is sometimes necessary to use warm lye. Regardless of what kind of cleaning agent filter should always be kept clean.
Cleaned immediately after anti-rust coating on the bearing grease oil or rust.
2, check with the judge
In order to determine whether the re-use of the removed bearing should focus on checking the accuracy of its size, rotation accuracy, internal clearance and with the surface, raceway, cage and ring.
On the inspection results, may be used to bearing or bearings were judged proficient.
Determine the mechanical properties and the criteria according to the degree of importance and checking cycles vary. If the following injury, the bearings must not be reused and must be replaced.
1) bearing parts breakage and defects.
2) rolling surface raceway material peeling.
Bearing fault identification method
Not by removing checks to identify or predict the bearing in operation without failure, to improve productivity and economy are very important.
The main identification methods are as follows:
1) identified by voice
Identify needs through sound experience. Must be adequately trained to recognize bearing achieve sound and non-bearing sound. To do this, you should try to carry out this work by hand. A listening or listening rods attached to the housing can clearly hear the sound of the bearing.
2) identification of the operating temperature
This method is relatively identification method is limited to use in the operation state is not changing situations. Therefore, the temperature must be continuously recorded. Fails, only the temperature rises, there will be irregular changes.
3) to identify the state of the lubricant
The lubricant sampling and analysis, through its pollution level is mixed with foreign matter or metal powders to judge. This method does not close observation bearings or large bearings are particularly effective.
2013年7月14日星期日
Tapered roller bearing role and use of matters
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 bearings 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 bearings 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.
Tapered roller bearings are devices emerged in the process of scar secondary reason is: the bearing being installed, assembled emerge inner, outer skew; or promise is being installed and the process of assembling the emergence of strikes load bearing emerge eventually forming scar .
Tapered roller bearings are device according to job specifications should stop, should not form many achievements, such as in the form of devices or methods did when, will form the bearing surface of the raceway and Gulu emerged bearing linear scar formation. Deep groove ball bearing unit using indirect response when the bearing precision, life expectancy and functionality.
Tapered Roller Bearings and other aspects of quality are better though, but bearing are precision components, its use should also be carefully carried out. No matter how high-performance bearings, if used improperly, it will not get the expected performance. Note the use of the relevant bearings were the following:
(A) maintain tapered roller bearings and surrounding clean.
Even the eyes can not see small dust, will give adversely affect the bearings. Therefore, to keep the surrounding clean so that dust will not invade bearings.
(2), exercise extreme caution.
In the use of tapered roller bearings to give a strong impact, it will have a scar and indentation, cause of the accident. Severe cases, crack, fracture, it must be noted.
(3), using the appropriate operating tool.
Avoid the existing tools instead, you must use the right tools.
(4), note tapered roller bearing corrosion.
Bearing operation, the hands sweat will become rusty cause. To pay attention to clean hands operation, the best possible wear gloves.
Tapered roller bearings use hearing to identify irregular operation is a very common method, examples such as using electronic stethoscope to check certain parts feel unusual noises are experienced operator. If the bearing is in good operating condition, it emits low whining sound, if a sharp hissing sound tapered roller bearings, squeaky voice and other irregular sounds, usually means bearing in poor operating condition.
1, the tile surface corrosion: spectra showed that the concentration of non-ferrous metal element anomalies; iron spectrum, there were many non-ferrous metal components submicron wear particles; lubricants excessive moisture, acid exceeded.
2, the journal surface strain: iron spectrum in cutting abrasive or black iron oxide particles present on the surface of metal tempering colors.
3, the journal surface corrosion: spectra showed abnormal concentrations of iron, iron spectrum, there are many sub-micron particles of iron content, excessive moisture or oil acid value exceeded.
4, the surface strain: iron spectrum were found to have cutting abrasive, abrasive ingredients ferrous metals.
5, tile back fretting: spectra showed abnormal concentrations of iron, iron spectrum, there are many iron content submicron wear particles, water and oil acid abnormalities.
Lubrication conditions in the liquid, separated from the sliding surface is not in direct contact with oil, but also can greatly reduce the friction loss and surface wear, the film also has a certain vibration absorption capacity
Sharp creaking noise may be due to inadequate lubrication caused. File bearing clearance will cause metallic sound. Tapered roller bearing outer ring dent on the track will cause vibration, resulting in smooth and crisp sound, if caused by the installation of percussion scars will produce noise, this noise will be low as the bearing speed varies. If there are intermittent noise, then the rolling elements may be damaged, tapered roller bearings This sound occurs when the damaged surface is rolling out of date, bearing if contaminants often cause hissing sound, severe bearing damage will irregular and huge noise.
Bearing damage can certainly perceptible by listening to, but usually at this time has come to bearings must not be replaced immediately. Therefore, a better use of such electronic methods such as condition monitoring instruments, tapered roller bearings off the bearing pre-eruptive functioning.
Tapered roller bearings 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.
Tapered roller bearings are devices emerged in the process of scar secondary reason is: the bearing being installed, assembled emerge inner, outer skew; or promise is being installed and the process of assembling the emergence of strikes load bearing emerge eventually forming scar .
Tapered roller bearings are device according to job specifications should stop, should not form many achievements, such as in the form of devices or methods did when, will form the bearing surface of the raceway and Gulu emerged bearing linear scar formation. Deep groove ball bearing unit using indirect response when the bearing precision, life expectancy and functionality.
Tapered Roller Bearings and other aspects of quality are better though, but bearing are precision components, its use should also be carefully carried out. No matter how high-performance bearings, if used improperly, it will not get the expected performance. Note the use of the relevant bearings were the following:
(A) maintain tapered roller bearings and surrounding clean.
Even the eyes can not see small dust, will give adversely affect the bearings. Therefore, to keep the surrounding clean so that dust will not invade bearings.
(2), exercise extreme caution.
In the use of tapered roller bearings to give a strong impact, it will have a scar and indentation, cause of the accident. Severe cases, crack, fracture, it must be noted.
(3), using the appropriate operating tool.
Avoid the existing tools instead, you must use the right tools.
(4), note tapered roller bearing corrosion.
Bearing operation, the hands sweat will become rusty cause. To pay attention to clean hands operation, the best possible wear gloves.
Tapered roller bearings use hearing to identify irregular operation is a very common method, examples such as using electronic stethoscope to check certain parts feel unusual noises are experienced operator. If the bearing is in good operating condition, it emits low whining sound, if a sharp hissing sound tapered roller bearings, squeaky voice and other irregular sounds, usually means bearing in poor operating condition.
1, the tile surface corrosion: spectra showed that the concentration of non-ferrous metal element anomalies; iron spectrum, there were many non-ferrous metal components submicron wear particles; lubricants excessive moisture, acid exceeded.
2, the journal surface strain: iron spectrum in cutting abrasive or black iron oxide particles present on the surface of metal tempering colors.
3, the journal surface corrosion: spectra showed abnormal concentrations of iron, iron spectrum, there are many sub-micron particles of iron content, excessive moisture or oil acid value exceeded.
4, the surface strain: iron spectrum were found to have cutting abrasive, abrasive ingredients ferrous metals.
5, tile back fretting: spectra showed abnormal concentrations of iron, iron spectrum, there are many iron content submicron wear particles, water and oil acid abnormalities.
Lubrication conditions in the liquid, separated from the sliding surface is not in direct contact with oil, but also can greatly reduce the friction loss and surface wear, the film also has a certain vibration absorption capacity
Sharp creaking noise may be due to inadequate lubrication caused. File bearing clearance will cause metallic sound. Tapered roller bearing outer ring dent on the track will cause vibration, resulting in smooth and crisp sound, if caused by the installation of percussion scars will produce noise, this noise will be low as the bearing speed varies. If there are intermittent noise, then the rolling elements may be damaged, tapered roller bearings This sound occurs when the damaged surface is rolling out of date, bearing if contaminants often cause hissing sound, severe bearing damage will irregular and huge noise.
Bearing damage can certainly perceptible by listening to, but usually at this time has come to bearings must not be replaced immediately. Therefore, a better use of such electronic methods such as condition monitoring instruments, tapered roller bearings off the bearing pre-eruptive functioning.
The use of angular contact ball bearings check
Machine shaft parts, especially the spindle, thrust ball bearings are generally assembled into one, and a high rotational speed, and sometimes it will produce very high heat. This phenomenon if not removed, will cause the angular contact ball bearing overheating, and to the corresponding parts of the machine to produce thermal deformation temperature, serious cause spindle and tailstock is not high, which not only affects the accuracy and precision machine itself and would have bearing burn.
Rating fatigue life, refers to a group of the same type of bearing, operating under the same conditions, 90% of the angular contact ball bearing does not appear rolling fatigue spalling of the total number of revolutions. At constant speed, the more the total running time to indicate the nominal fatigue life.
In the research thrust ball bearing life, you can not only consider the fatigue life, but also according to the performance of the bearing should have consolidated several usage limit to consider. For example, greased bearing grease life. Noise life, abrasion life, etc., according to different purposes, using different reference limits, and therefore, most of the experience of pre-selected limits.
Therefore, only the survey angular contact ball bearing damage, injury is difficult to know the real reason. However, if you know the thrust ball bearings using mechanical, conditions of use, bearing the surrounding structure, to understand the situation before and after the accident, combined with state of the bearing damage, and several reasons, we can prevent similar incidents from recurring.
angular contact ball bearing are available judgments, mainly on account of bearing damage, mechanical properties, importance, operating conditions, to be determined during the next overhaul. If you can not use the following defects must be replaced with new thrust ball bearings. The inner ring, outer ring, rolling elements, cage on any cracks or gaps.
Kinds of bearing wear failure is a common failure modes, can generally be divided according to wear the most common form of abrasive wear and adhesive wear.
1 film resistors diagnostic techniques
Features: for different operating conditions using the same criteria. For flaking, indentation, cracks or other abnormal diagnostic poor results.
Application: for rotary axes exposed occasions.
2 Vibration diagnostic techniques
Features: Vibration diagnostic technique widely used; allows online monitoring; diagnosis faster diagnosis theory has matured.
Applications: especially suitable for rotating machinery angular contact ball bearing fault monitoring.
3 Ferrography diagnostic techniques
Features: The machine without the disintegration; investment is low, the effect is good; able to find oil-bearing early fatigue failure; do wear mechanism.
Applications: Suitable for lubricants lubricated angular contact ball bearing fault diagnosis, for grease lubricated bearings more difficult.
4 Temperature diagnostic techniques
Features: Diagnostic simple; judgment on bearing burn better.
Applications: Suitable for machine bearing simple routine diagnosis.
5 optical monitoring and diagnosis techniques
Features: Fiber optic displacement sensor with high sensitivity; directly extract the signal from non-oil bearing surface to improve the signal to noise ratio; may directly reflect the angular contact ball bearing manufacturing quality, surface wear, load, lubrication and clearance situation.
Applications: For the sensor can be installed in the bearing seat of the machine.
6 acoustic emission diagnostic techniques
Features: Diagnostic fast, simple; available on-line monitoring.
Applications: In recent years the development of new technologies, in the bearing condition monitoring is seldom used.
Direct hands to take non-oil bearing, to fully wash hands sweat, and coated with high-quality mineral oil before, during the rainy season and summer with particular attention to rust. In some special operating conditions, angular contact ball bearings can get a longer life of the conventional calculation, especially in the case of light load. These special operating condition is, when the rolling surface (track and rolling member) by a lubricant film to effectively separate and restrictions may result in contamination of surface damage. In fact, under ideal conditions, the so-called permanent bearing life is possible
Does not allow a strong punch, does not allow a direct hit with a hammer bearing, does not allow pass through the rolling pressure.
Angular contact ball bearings a rotating inner ring and outer ring raceway, the rolling contact with the rolling body is thus running track for the dark side, running track attached to the roller surface does not belong to an exception, which can be traced load conditions, so removing oil-free bearings, please strict attention and observation raceway running track.
Rating fatigue life, refers to a group of the same type of bearing, operating under the same conditions, 90% of the angular contact ball bearing does not appear rolling fatigue spalling of the total number of revolutions. At constant speed, the more the total running time to indicate the nominal fatigue life.
In the research thrust ball bearing life, you can not only consider the fatigue life, but also according to the performance of the bearing should have consolidated several usage limit to consider. For example, greased bearing grease life. Noise life, abrasion life, etc., according to different purposes, using different reference limits, and therefore, most of the experience of pre-selected limits.
Therefore, only the survey angular contact ball bearing damage, injury is difficult to know the real reason. However, if you know the thrust ball bearings using mechanical, conditions of use, bearing the surrounding structure, to understand the situation before and after the accident, combined with state of the bearing damage, and several reasons, we can prevent similar incidents from recurring.
angular contact ball bearing are available judgments, mainly on account of bearing damage, mechanical properties, importance, operating conditions, to be determined during the next overhaul. If you can not use the following defects must be replaced with new thrust ball bearings. The inner ring, outer ring, rolling elements, cage on any cracks or gaps.
Kinds of bearing wear failure is a common failure modes, can generally be divided according to wear the most common form of abrasive wear and adhesive wear.
1 film resistors diagnostic techniques
Features: for different operating conditions using the same criteria. For flaking, indentation, cracks or other abnormal diagnostic poor results.
Application: for rotary axes exposed occasions.
2 Vibration diagnostic techniques
Features: Vibration diagnostic technique widely used; allows online monitoring; diagnosis faster diagnosis theory has matured.
Applications: especially suitable for rotating machinery angular contact ball bearing fault monitoring.
3 Ferrography diagnostic techniques
Features: The machine without the disintegration; investment is low, the effect is good; able to find oil-bearing early fatigue failure; do wear mechanism.
Applications: Suitable for lubricants lubricated angular contact ball bearing fault diagnosis, for grease lubricated bearings more difficult.
4 Temperature diagnostic techniques
Features: Diagnostic simple; judgment on bearing burn better.
Applications: Suitable for machine bearing simple routine diagnosis.
5 optical monitoring and diagnosis techniques
Features: Fiber optic displacement sensor with high sensitivity; directly extract the signal from non-oil bearing surface to improve the signal to noise ratio; may directly reflect the angular contact ball bearing manufacturing quality, surface wear, load, lubrication and clearance situation.
Applications: For the sensor can be installed in the bearing seat of the machine.
6 acoustic emission diagnostic techniques
Features: Diagnostic fast, simple; available on-line monitoring.
Applications: In recent years the development of new technologies, in the bearing condition monitoring is seldom used.
Direct hands to take non-oil bearing, to fully wash hands sweat, and coated with high-quality mineral oil before, during the rainy season and summer with particular attention to rust. In some special operating conditions, angular contact ball bearings can get a longer life of the conventional calculation, especially in the case of light load. These special operating condition is, when the rolling surface (track and rolling member) by a lubricant film to effectively separate and restrictions may result in contamination of surface damage. In fact, under ideal conditions, the so-called permanent bearing life is possible
Does not allow a strong punch, does not allow a direct hit with a hammer bearing, does not allow pass through the rolling pressure.
Angular contact ball bearings a rotating inner ring and outer ring raceway, the rolling contact with the rolling body is thus running track for the dark side, running track attached to the roller surface does not belong to an exception, which can be traced load conditions, so removing oil-free bearings, please strict attention and observation raceway running track.
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