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What are the FAG bearing damage status and solutions? (1)

Update:07-07-2020
Summary:

1. Stripping Damage state: When the FAG bearing is subj […]

1. Stripping
Damage state: When the FAG bearing is subjected to load rotation again, the raceway surface or rolling body surface of the inner ring and outer ring exhibits scaly peeling due to rolling fatigue.
Cause: The load is too large. Improper installation (non-linear) torque load foreign matter intrusion and water ingress. Poor lubrication, inappropriate lubricant FAG bearing clearance is not appropriate. The FAG bearing box has poor precision, and the rigidity of the FAG bearing box has a large deflection caused by rust, erosion points, scratches and indentations (surface deformation phenomena).
Measures: Check the size of the load and improve the installation method of the FAG bearing used in the research again to improve the sealing device and prevent rust during shutdown. Use lubricants of appropriate viscosity to improve lubrication methods. Check the accuracy of the shaft and FAG bearing housing. Check play.
2. Skinning
Damage state: A dark surface with slight abrasion is present, and there are many small cracks up to 5-10m deep from the surface, and a small peeling (micro peeling) occurs in a large range
Reason: The lubricant is not suitable. Foreign matter has entered the lubricant. Poor lubricant causes rough surface. The surface finish of the matching rolling parts is not good.
Measures: Select lubricant to improve the sealing device to improve the surface finish of the matching rolling parts.
3. Stuck
Damage state: The so-called seizure is a surface damage caused by a combination of minor burns on the sliding surface. Linear scratches on the chute surface and rolling surface in the circumferential direction. The cycloidal flaw on the end surface of the roller is close to the collar surface of the roller.
Cause: Excessive load, excessive preload. Poor lubrication. Foreign bodies bite in. The inclination of the inner ring and outer ring, the deflection of the shaft. The accuracy of the shaft and FAG bearing box is poor.
Measures: Check the size of the load. Preload should be appropriate. Improve lubricants and lubrication methods. Check the accuracy of the shaft and FAG bearing box.
4. Fracture
Damage state: The so-called breakage refers to a small part of breakage due to the application of musical impact or excessive load to the rib of the raceway wheel or the local part of the roller angle.
Reason: It was hit during installation. The load is too large. Poor use such as drop.
Measures: Improve the installation method (use hot assembly, use appropriate tool holder). Correct the load conditions. FAG bearings are installed in place so that the ribs are supported.
5. Cracks, cracks
Damage state: The so-called crack refers to the crack damage of the raceway wheel or rolling element. If it continues to be used, it will also include crack development cracks.
Reason: Excessive excess. Excessive load, impact load. The divestiture has developed. Heat generation and fretting wear due to the contact between the raceway wheel and the mounting member. Fever caused by creep. The cone angle of the cone axis is bad. The cylindricity of the shaft is bad. The fillet radius of the shaft step is larger than the chamfer of the FAG bearing, which causes interference with the chamfer of the FAG bearing.
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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