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Correctly judge the operation law and fault treatment of Timken bearing

  • Needle roller bearing is a mass-produced mechanical part with strict manufacturing accuracy and high degree of technical specialization. Therefore, for the vast majority of bearing varieties that are easy to buy, it should be more cost-effective to buy than repair.

Correctly judge the operation law and fault treatment of Timken bearing

  •  In addition to economy, the repair of bearing also has its technicality, which requires the repairer to fully understand the corresponding technical requirements of bearing and the characteristics of bearing and its parts in structure, process and materials, Otherwise, it is difficult to ensure the satisfactory effect of bearing repair.Correctly judge the operation law and fault treatment of Timken bearing
  • Benchmark invariant combined repair method. When repairing and adjusting the accuracy of dimension chain, according to the principle of datum coincidence, only one datum plane is selected as the datum, that is, the design datum, while all other action surfaces are repaired based on this plane. This combined repair benchmark is convenient to check the accuracy and reduce the accumulated error. For example, in the repair of variable speed hydraulic coupling, the bearing body is often used as the benchmark.Correctly judge the operation law and fault treatment of Timken bearing
  • Datum transformation combined repair method. Sometimes the deformation of the design datum is too large to be used, so it is necessary to select some other planes as the datum and re integrate the dimension chain at the same time. For example, if the deformation of the bearing body is too large, the bearing body shall be reprocessed and corrected based on the rotating assembly, and then the assembly dimension chain shall be adjusted according to the size of the reprocessed bearing body. The method of repairing the adjusting ring shall be adopted to detect and repair according to the arrangement order of the dimension chain, so as to control the accuracy of the closed ring.
  • Another function of Timken bearing sealing device is to prevent grease leakage from bearing components. If there is oil leakage, it will quickly destroy the normal lubrication of the bearing and burn out the bearing due to fever. In addition, the poor sealing device will not only cause spreading due to oil leakage, but also pollute mechanical equipment and processed products. Therefore, in order to make the machine operate normally, the bearing must have a good sealing device. 
  • Once the outer spherical bearing rotates, the raceway surface of the inner ring and the outer ring is in rolling contact with the rolling element, so the running track is a dark surface. The running track attached to the raceway surface is not abnormal, so the load conditions can be known. Therefore, please pay close attention and observe the running track of the raceway surface when disassembling Timken bearing.
  • If you carefully observe the running track, you will know that it only bears radial load, large axial load, moment load, or extreme uneven rigidity on the bearing housing. It can be checked whether the unexpected load is added to the bearing and whether the installation error is too large, which will become a clue to investigate the cause of the damage of the outer spherical bearing.
  • Lubrication is very important, not only for Timken bearings, but also for all bearings. However, please note that the bearing should not add too much grease. Then it’s time to change the lubricant of the bearing. After draining the old engine oil, if possible, the bearings lubricated with engine oil should be filled with fresh engine oil and let the machine rotate at low speed for a few minutes. Correctly judge the operation law and fault treatment of Timken bearing
  • Make the oil collect residual pollutants as much as possible, and then drain the oil. When replacing the grease of the bearing lubricated with grease, the Joe remover used should avoid the contact of cotton with any part of the outer spherical bearing. Because these residual fibers may wedge between rolling parts and cause damage, especially in the application of small bearings.Correctly judge the operation law and fault treatment of Timken bearing
  • When inspecting the bearing, never expose the bearing to pollutants or moisture. If the work is interrupted, the machine shall be covered with oil paper, plastic sheet or similar materials. If it is possible to clean the naked bearing without disassembly, clean it with a brush coated with petroleum solvent, and then wipe it dry with a piece of lint free cloth or blow it dry with compressed air (be careful not to start the rotation of the bearing assembly). 
  • Use a small mirror and a probe similar to that used by dentists to check the track surface, retainer and beads of the bearing. Do not clean Timken bearings with encrypted cover or dust-proof; Just wipe the outer surface. If the bearing is damaged, it needs to be replaced. It is much more economical to replace the bearing during the regular shutdown and maintenance period than the loss of sudden shutdown due to the damage of the array bearing.
  • Contact fatigue failure refers to the failure of bearing working surface caused by alternating stress. Contact fatigue spalling occurs on the working surface of the bearing and is often accompanied by fatigue cracks. It first occurs from the large alternating shear stress below the contact surface, and then extends to the surface to form different spalling shapes, such as pitting or pitting spalling, which is called shallow spalling.
  • Wear failure refers to the failure caused by the continuous wear of the metal on the working surface caused by the relative sliding friction between the surfaces. Continuous wear will cause gradual damage to bearing parts, and eventually lead to the loss of bearing dimensional accuracy and other related problems. 
  • Wear may affect the change of shape, the increase of fit clearance and the change of working surface morphology, may affect the lubricant or make it polluted to a certain extent, resulting in the complete loss of lubrication function, so that the outer spherical bearing loses the rotation accuracy and even can not operate normally. Wear failure is one of the common failure modes of all kinds of Timken bearings. According to the wear form, it can be divided into common abrasive wear and adhesive wear.
  • It is the running track of the outer ring when the cylindrical roller bearing used in the rotating load of the inner ring is correctly loaded with radial load.Correctly judge the operation law and fault treatment of Timken bearing
  • It is a running track with relatively inclined inner ring and outer ring and large deflection of shaft. The running track of raceway surface produces intensity in its longitudinal direction. At the outlet of load ring, the running track is inclined, and the double row tapered roller bearing rotates the inner ring.Correctly judge the operation law and fault treatment of Timken bearing
  • Indicates the running track of the outer ring when only radial load is borne. L represents the trajectory under axial load only. When the inner ring and outer ring are relatively inclined and only bear radial load, their running track deviates from the two rows of track surfaces by 180. Location of the (m). There may be many factors affecting the service life of Timken imported bearings. 
  • The possible factors and internal friction sound have been further explained. The main factors used for adjustment are installation, use and maintenance, maintenance and repair, which meet the technical requirements. According to the technical requirements for the installation, use, maintenance and maintenance of Timken imported bearings, the contact load, speed and lubrication status of the operating bearings are monitored and inspected. The direct cause of the abnormality is found and adjusted back to normal.
  • Installation conditions, one of the factors used for bearings is the load-bearing force that often causes the change of state between various parts of the incorrect installation package, the primary factor of abnormal state of bearing working temperature, vibration, noise, gradual progress, and the quality of raw materials has been improved. The proportion of raw material quality factor in bearing fault analysis has decreased significantly, but it is still one of the main factors of bearing failure.Correctly judge the operation law and fault treatment of Timken bearing
  • Strictly inspect the raw materials of steel wire to prevent the raw materials with martensitic structure, decarburization, rough surface, surface transverse lines, cracks and other defects from entering the drawing process; Or after pretreatment, the material properties are improved before processing.Correctly judge the operation law and fault treatment of Timken bearing
Correctly judge the operation law and fault treatment of Timken bearing
  • Benchmark invariant combined repair method. When repairing and adjusting the accuracy of dimension chain, according to the principle of datum coincidence, only one datum plane is selected as the datum, that is, the design datum, while all other action surfaces are repaired based on this plane.Correctly judge the operation law and fault treatment of Timken bearing
  •  This combined repair benchmark is convenient to check the accuracy and reduce the accumulated error. For example, in the repair of variable speed hydraulic coupling, the bearing body is often used as the benchmark.Correctly judge the operation law and fault treatment of Timken bearing
  • Datum transformation combined repair method. Sometimes the deformation of the design datum is too large to be used, so it is necessary to select some other planes as the datum and re integrate the dimension chain at the same time.Correctly judge the operation law and fault treatment of Timken bearing
  •  For example, if the deformation of the bearing body is too large, the bearing body shall be reprocessed and corrected based on the rotating assembly, and then the assembly dimension chain shall be adjusted according to the size of the reprocessed bearing body. The method of repairing the adjusting ring shall be adopted to detect and repair according to the arrangement order of the dimension chain, so as to control the accuracy of the closed ring.Correctly judge the operation law and fault treatment of Timken bearing
  • Another function of Timken bearing sealing device is to prevent grease leakage from bearing components. If there is oil leakage, it will quickly destroy the normal lubrication of the bearing and burn out the bearing due to fever. In addition, the poor sealing device will not only cause spreading due to oil leakage, but also pollute mechanical equipment and processed products. Therefore, in order to make the machine operate normally, the bearing must have a good sealing device. Correctly judge the operation law and fault treatment of Timken bearing
  • Once the outer spherical bearing rotates, the raceway surface of the inner ring and the outer ring is in rolling contact with the rolling element, so the running track is a dark surface. The running track attached to the raceway surface is not abnormal, so the load conditions can be known. Therefore, please pay close attention and observe the running track of the raceway surface when disassembling Timken bearing.Correctly judge the operation law and fault treatment of Timken bearing
  • If you carefully observe the running track, you will know that it only bears radial load, large axial load, moment load, or extreme uneven rigidity on the bearing housing. It can be checked whether the unexpected load is added to the bearing and whether the installation error is too large, which will become a clue to investigate the cause of the damage of the outer spherical bearing.Correctly judge the operation law and fault treatment of Timken bearing
  • Lubrication is very important, not only for Timken bearings, but also for all bearings. However, please note that the bearing should not add too much grease. Then it’s time to change the lubricant of the bearing. After draining the old engine oil, if possible, the bearings lubricated with engine oil should be filled with fresh engine oil and let the machine rotate at low speed for a few minutes.Correctly judge the operation law and fault treatment of Timken bearing
  •  Make the oil collect residual pollutants as much as possible, and then drain the oil. When replacing the grease of the bearing lubricated with grease, the Joe remover used should avoid the contact of cotton with any part of the outer spherical bearing. Because these residual fibers may wedge between rolling parts and cause damage, especially in the application of small bearings.Correctly judge the operation law and fault treatment of Timken bearing
  • When inspecting the bearing, never expose the bearing to pollutants or moisture. If the work is interrupted, the machine shall be covered with oil paper, plastic sheet or similar materials. If it is possible to clean the naked bearing without disassembly, clean it with a brush coated with petroleum solvent, and then wipe it dry with a piece of lint free cloth or blow it dry with compressed air (be careful not to start the rotation of the bearing assembly).Correctly judge the operation law and fault treatment of Timken bearing
  •  Use a small mirror and a probe similar to that used by dentists to check the track surface, retainer and beads of the bearing. Do not clean Timken bearings with encrypted cover or dust-proof; Just wipe the outer surface. If the bearing is damaged, it needs to be replaced. It is much more economical to replace the bearing during the regular shutdown and maintenance period than the loss of sudden shutdown due to the damage of the array bearing.Correctly judge the operation law and fault treatment of Timken bearing
  • Contact fatigue failure refers to the failure of bearing working surface caused by alternating stress. Contact fatigue spalling occurs on the working surface of the bearing and is often accompanied by fatigue cracks. It first occurs from the large alternating shear stress below the contact surface, and then extends to the surface to form different spalling shapes, such as pitting or pitting spalling, which is called shallow spalling.Correctly judge the operation law and fault treatment of Timken bearing
  • Wear failure refers to the failure caused by the continuous wear of the metal on the working surface caused by the relative sliding friction between the surfaces. Continuous wear will cause gradual damage to bearing parts, and eventually lead to the loss of bearing dimensional accuracy and other related problems. Correctly judge the operation law and fault treatment of Timken bearing
  • Wear may affect the change of shape, the increase of fit clearance and the change of working surface morphology, may affect the lubricant or make it polluted to a certain extent, resulting in the complete loss of lubrication function, so that the outer spherical bearing loses the rotation accuracy and even can not operate normally. Wear failure is one of the common failure modes of all kinds of Timken bearings. According to the wear form, it can be divided into common abrasive wear and adhesive wear.
  • It is the running track of the outer ring when the cylindrical roller bearing used in the rotating load of the inner ring is correctly loaded with radial load.
  • It is a running track with relatively inclined inner ring and outer ring and large deflection of shaft. The running track of raceway surface produces intensity in its longitudinal direction. At the outlet of load ring, the running track is inclined, and the double row tapered roller bearing rotates the inner ring.
  • Prevent and improve the poor microstructure defects of the workpiece, such as coarse flake pearlite, reticular ferrite, etc.
  • Strictly control the metallurgical quality of NSK bearing steel wire, prevent the blank containing non-metallic inclusions and folding defects from entering the processing process, and avoid brittle fracture failure of steel wire parts.Correctly judge the operation law and fault treatment of Timken bearing
  • The steel wire with element segregation found in the inspection of raw materials can be subject to preliminary heat treatment to eliminate defects and improve the structure. If normalizing treatment is adopted in a protective atmosphere, the harm of segregation can be reduced.Correctly judge the operation law and fault treatment of Timken bearing
  • Whether the selection is appropriate or not is still a bearing fault analysis that must be considered. Bearing manufacturing will be adjusted and restored to normal through forging, heat treatment, turning and lubrication conditions to monitor and check the direct causes of abnormalities. The installation condition is one of the factors for using the bearing.
  • It is the primary factor of the bearing capacity that often causes the state change between various parts of the incorrect installation package. In the abnormal operation state and the early termination of the inner life, the main factors refer to the structural design, high-quality manufacturing technology and materials. There are three factors that determine the quality of the bearing.Correctly judge the operation law and fault treatment of Timken bearing
  • Timken imported bearings are superior. Even if the shape becomes a low buzzing sound, there will be knocking noise when injured. This noise will collide and diverge according to the speed of Timken imported bearings.Correctly judge the operation law and fault treatment of Timken bearing
  • If there is intermittent noise, it is through. If sharp’s hissing, squeaking and other sounds do not follow the rules, Timken imported bearings that often perform poorly will reveal or even reverse the situation. Timken bearing shows strong regularity and good repeatability in its use. Correctly judge the operation law and fault treatment of Timken bearing
  • When the normal high-quality bearing (bearing) is used at the beginning, the vibration and noise are relatively small, but the spectrum is scattered and the amplitude is small, which may be caused by some defects in the manufacturing process, such as surface burrs.
  • After a period of movement, the vibration and noise maintain a certain level, and the frequency spectrum is very single, with only one or two times of the frequency. The frequency spectrum above three times of power frequency rarely appears, and the bearing state is very stable and enters the stable working period.Correctly judge the operation law and fault treatment of Timken bearing
  • After continued operation and entering the later stage of use, the vibration and noise of Timken bearing began to increase, and sometimes abnormal sound appeared, but the change of vibration increase was slow. At this time, the bearing kurtosis began to suddenly reach a certain value. We believe that the bearing shows initial failure at this time.Correctly judge the operation law and fault treatment of Timken bearing
  • At this time, it is required to closely monitor the Timken bearing and pay close attention to its changes. Since then, the bearing kurtosis value began to decline rapidly and close to the normal value, while the vibration and noise began to increase significantly, and the increase amplitude began to accelerate. When the vibration exceeded the vibration standard (such as ISO2372 standard), the bearing kurtosis value also began to increase rapidly. 
  • When both the vibration standard and the kurtosis value also exceeded the normal value (the relative standard of kurtosis available), we believe that the bearing has entered the late fault production, and the equipment needs to be repaired in time, Replace the bearing.Correctly judge the operation law and fault treatment of Timken bearing
  • The bearing shows the characteristics of late failure. The time from the occurrence of serious failure (generally bearing damage, such as shaft holding, burn, sand frame spallation, raceway, bead wear, etc.) is mostly less than one week. The larger the equipment capacity, the faster the speed, and the shorter the interval. Therefore, in the actual bearing fault diagnosis, once the late fault characteristics are found, the bearing fault should be determined and the maintenance should be arranged as soon as possible.Correctly judge the operation law and fault treatment of Timken bearing
  • For the rolling sound of the bearing, the sound detector is used to check the size and sound quality of the rolling sound of the running bearing. Even if the bearing has slight peeling and other damage, it will produce abnormal sound and irregular sound, which can be distinguished by the sound detector.Correctly judge the operation law and fault treatment of Timken bearing
  • Bearing vibration bearing vibration is very sensitive to the damage of Timken bearing, such as peeling, indentation, corrosion, crack, wear, etc. will be reflected in the bearing vibration measurement. Therefore, the vibration can be measured by using a special bearing vibration meter (frequency analyzer, etc.), and the specific abnormal situation can not be inferred by frequency division. Correctly judge the operation law and fault treatment of Timken bearing
  • The measured values are different due to the service conditions of the bearing or the installation position of the sensor. Therefore, it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment standard.Correctly judge the operation law and fault treatment of Timken bearing
  • The temperature of the bearing can be inferred from the temperature outside the bearing chamber. It is more appropriate if the oil hole can be used to directly measure the temperature of the outer ring of the bearing. Usually, the temperature of Timken bearing rises slowly with the start of operation and reaches a stable state after 1-2 hours.
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