1. Rolling surface metal peeling
Both the NTN bearing body and the inner and outer ring raceways are subjected to periodic pulsating loads, resulting in cyclically varying contact stresses. When the number of stress cycles reaches a certain value, fatigue peeling occurs on the working surface of the body or the inner and outer ring raceways. If the load on the NTN bearing is too large, this fatigue will be exacerbated. In addition, the NTN bearing is not properly installed, the shaft is bent, and the raceway is peeled off.
Fatigue spalling of the NTN bearing raceway reduces the accuracy of the shaft and causes vibration and noise in the mechanism.
2.NTN bearing burns
The burned NTN bearing has a tempering color on the raceway and body. The causes of burns are generally insufficient lubrication, the quality of the lubricant does not meet the requirements or deterioration, and the NTN bearing assembly is too tight.
3. Plastic deformation
Uneven pits appear on the contact surface between the raceway and the roller of the NTN bearing, indicating that the NTN bearing is plastically deformed. The reason is that the NTN bearing under the action of large static load or impact load, the local stress of the working surface exceeds the yield limit of the material, which generally occurs on the NTN bearing with low speed rotation.
4.NTN bearing race crack
The cause of the crack in the NTN bearing race may be that the NTN bearing is too tight, the NTN bearing is loose in the foreign or inner ring, the NTN bearing is deformed, and the surface of the NTN bearing is poorly machined.
5. The cage is broken
The reason is insufficient lubrication, broken body, and skewed seat.
6. The metal of the cage adheres to the body
The possible cause is that the body is stuck in the cage or insufficiently lubricated.
7-seat raceway is heavily worn
The service life of any bearing depends to a large extent on the maintenance and maintenance it receives. This is especially true in industrial applications where working conditions are harsh, heavy loads, dust and pollution are common.
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