Damage of NSK Cylindrical Roller Bearings

When dismantling and inspecting the nsk cylindrical roller bearing, the fault of the bearing and the cause of the damage can be judged according to the damage of the bearing. 1. The metal peels off the raceway surface. The rolling elements of the bearing and the raceway surfaces of the inner and outer rings are subjected to periodic pulsating loads, resulting in periodically changing contact stress. When the number of stress cycles reaches a certain value, fatigue spalling occurs on the rolling elements or the working surfaces of the inner and outer ring raceways. This fatigue is exacerbated if the bearing is overloaded. In addition, if the bearing is not installed correctly and the shaft is bent, the phenomenon of raceway peeling will also occur. Fatigue spalling of the bearing raceway will reduce the running accuracy of the shaft, causing vibration and noise in the mechanism. 2. Bearings with burns and burns have tempered color on their raceways and rolling elements. The causes of burns are generally insufficient lubrication, unsatisfactory quality or deterioration of lubricating oil, and excessively tight bearing assembly. 3. Plastic deformation The 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 under the action of a large static load or impact load, the local stress of the working surface exceeds the yield limit of the material, which generally occurs on bearings rotating at low speeds. 4. Cracks in the bearing seat ring The reason for the cracking of the bearing seat ring may be that the bearing is too tight, the foreign or inner ring of the bearing is loose, the bearing part is deformed, and the surface of the installed bearing is poorly processed, etc. 5. The reasons for the fracture of the cage are insufficient lubrication, broken rolling elements, and skewed races. 6. The metal of the cage adheres to the rolling elements. The possible cause is that the rolling elements are stuck in the cage or insufficient lubrication. 7. Serious wear of the raceway of the seat ring may be caused by foreign objects falling into the seat ring, insufficient lubricating oil or inappropriate lubricating oil grade.

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