When disassembling and inspecting rolling bearings, the failure and cause of bearing damage can be determined based on the bearing damage.

1. Metal peeling on the raceway surface The rolling elements and the inner and outer ring raceways of the bearings are subjected to periodic pulsating loads, which generates periodic contact stress. When the number of stress cycles reaches a certain value, fatigue peeling occurs on the rolling elements or the inner and outer ring raceway working surfaces. If the load on the bearing is too large, this fatigue will be aggravated. In addition, improper installation of the bearing and bending of the shaft will also cause raceway peeling. Fatigue peeling of the bearing raceway will reduce the running accuracy of the shaft and cause vibration and noise in the mechanism.

2. Bearing burns The raceways and rolling elements of the burned bearings have tempering colors. The causes of burns are generally insufficient lubrication, the quality of the lubricating oil does not meet the requirements or deterioration, and the bearings are assembled too tightly.

3. Plastic deformation Uneven pits appear on the contact surface between the raceway and the roller of the bearing, indicating that the bearing has plastic deformation. The reason is that the local stress on the working surface of the bearing exceeds the yield limit of the material under the action of a large static load or impact load. This situation generally occurs on bearings rotating at low speeds.

4. Cracks in the bearing race The reasons for cracks in the bearing race may be too tight fitting of the bearing, loose outer or inner ring of the bearing, deformation of the bearing's containing parts, poor surface processing of the installed bearing, etc.

5. The reason for the fragmentation of the cage is insufficient lubrication, crushed rolling elements, skewed races, etc.

6. The metal of the cage adheres to the rolling element. The possible reason is that the rolling element is stuck in the cage or insufficient lubrication.

7. Severe wear of the raceway may be caused by foreign matter falling into the race, insufficient lubricating oil or inappropriate lubricating oil grade. The main factors affecting rolling bearings are: load conditions, lubrication conditions, assembly conditions, environmental conditions, and material or manufacturing accuracy.