Reasons for 16 types of bearing damage and corresponding measures

Inappropriate lubricants, excessive load, excessive preload, excessive interference, foreign matter biting of metal powder, etc. can cause damage to the bearing. After bearing damage, fully understand the bearing usage and make clear The situation of the accident can be prevented from happening again when combined with bearing damage and various reasons. Here are the reasons for bearing damage and remedial measures.
 Bearing peeling

Damage state: When the bearing is subjected to load rotation, the raceway surface or the rolling surface of the inner ring and the outer ring exhibits a fish scale-like peeling phenomenon due to rolling fatigue.
Reason: The load is too large. Poor installation (non-linear) torque load foreign matter intrusion, water ingress. Poor lubrication, improper lubricant clearance, improper bearing clearance. The accuracy of the bearing housing is not good, and the rigidity of the bearing housing is uneven, the deflection of the shaft is large, the rust, the erosion point, the scratch and the indentation (surface deformation phenomenon) are caused.
Measures: Check the size of the load and the bearing used in the re-inspection to improve the installation method to improve the sealing device and prevent rust during shutdown. Use a lubricant of appropriate viscosity to improve the lubrication method. Check the accuracy of the shaft and bearing housing. Check the clearance.

2. Bearing card injury

Damage state: The so-called card injury is a surface damage caused by a combination of minute burns generated in a sliding surface flaw. Linear flaws in the circumferential direction of the slide surface and the rolling surface. The tangential flaw of the roller end face is close to the pinch of the collar surface of the roller end face.
Reason: Excessive load, excessive preload. Poor lubrication. Foreign body bites into it. The inclination of the outer ring of the inner ring and the deflection of the shaft. The accuracy of the shaft and bearing housing is poor.
Action: Check the size of the load. Preload should be appropriate. Improve lubricants and lubrication methods. Check the accuracy of the shaft and bearing housing.

3. Bearing cracks, cracks

Damage state: The so-called crack refers to the crack damage caused by the race wheel or the rolling element. If it continues to be used, it will also include cracks that develop cracks.
Reason: Too much excess. Excessive load, impact load. Stripping has developed. Heat and fretting wear due to contact of the raceway wheel with the mounting member. The fever caused by creep. The cone angle of the cone shaft is poor. The cylindricity of the shaft is poor. The corner radius of the shaft step is larger than the bearing chamfer and causes interference with the bearing chamfer.
Measures: The amount of interference is appropriate. Check the load conditions. Improve the installation method. The shape of the shaft should be appropriate.

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Correctly judge the running law and fault handling of TIMKEN bearing

TIMKEN bearings exhibit strong regularity during their use and are very repeatable. Normal high-quality bearings (bearings) are relatively small in vibration and noise at the beginning of use, but the spectrum is somewhat scattered and the amplitude is small, which may be due to some defects in the manufacturing process, such as surface burrs.
After a period of motion, the vibration and noise are maintained at a certain level, and the spectrum is very single, only one or two times the frequency. There are very few spectrums above the power frequency, and the bearing status is very stable and enters a stable working period.
After continuing to run, the vibration and noise of TIMKEN bearings began to increase, and sometimes abnormal sounds appeared, but the change of vibration increased slowly. At this time, the bearing kurtness value suddenly reached a certain value. We believe that the bearing is an initial failure at this time.
At this time, it is required to closely monitor the TIMKEN bearing and pay close attention to its changes. After that, the bearing kurtosis value begins to drop rapidly and approaches the normal value, while the vibration and noise begin to increase significantly, and the increase rate begins to accelerate. When the vibration exceeds the vibration standard (such as ISO2372 standard), the bearing kurtosis value also begins. Rapid increase, when both the vibration standard and the kurtosis value exceed the normal value (the available kurtosis relative standard), we believe that the bearing has entered the late fault production, it is necessary to repair the equipment in time and replace the bearing.
The bearing exhibits late fault characteristics to serious faults (generally bearing damage such as axle hung, burn, sand frame spalling, raceway, bead wear, etc.). The time is not more than one week. The larger the equipment capacity, the faster the speed. The shorter the interval. Therefore, in the actual bearing fault diagnosis, once the late fault characteristics are found, the bearing should be judged decisively and the repair should be arranged as soon as possible.

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