Hardware Knowledge Classroom: FAG Bearing Damage Status and Cause Measures

FAG bearing damage status and cause measures
Stripping

Damage state: When the FAG 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.

Cause: The load is too large. Poor installation (non-linear) torque load foreign matter intrusion, water ingress. Poor lubrication, improper lubricant, FAG bearing clearance is not appropriate. The accuracy of the FAG bearing housing is not good, and the deflection of the rigid uneven shaft of the FAG bearing housing is caused by large rust, erosion points, scratches and indentations (surface deformation phenomena).

Measures: Check the size of the load and the FAG 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 FAG bearing housing. Check the clearance.

2. Peeling

Damage state: It shows a dark surface with slight abrasion. There are many tiny cracks on the dark surface from the surface to 5-10m deep, and tiny shedding (small peeling) occurs in a wide range.

Cause: The lubricant is not suitable. Foreign matter enters the lubricant. Poor lubricant causes a rough surface. The surface finish of the paired rolling parts is not good.

Action: Select a lubricant to improve the seal to improve the surface finish of the paired rolling parts.

3. 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 injury. 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 jamming of the collar surface of the roller end face.

Cause: 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 FAG 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 FAG bearing housing.
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