NTN self-aligning ball bearing common faults of the impact on the life

NTN bearing removing check, according to the damage of bearing bearing failure and damage reasons. 1. Metal flake bearing raceway surface and inner and outer ring raceway surface under the role of the periodic pulse load, resulting in a periodic change of the contact stress. When the stress cycles after reaching a certain value, the bearing on the working plane or inner and outer ring raceway fatigue spalling. If the self-aligning ball bearing load is too big, can make the fatigue. In addition, NTN bearing installation is not straight, shaft bending, also can produce roll flaking off. Bearing raceway fatigue spalling can reduce the running accuracy of shaft vibration and noise in the organization. 2. Bearing burn burn bearing heat tint on the raceway, bearing. Burns is usually the cause of insufficient lubrication, lubricating oil quality does not conform to the requirements or metamorphism, and bearing assembly too tight. 3. Plastic deformation of bearing raceway and roller contact surface appear uneven pits, self-aligning ball bearings produce plastic deformation. The reason is that the NTN bearing in large under static load or shock loading, local stress exceeds the yield limit of material on the surface of the work, this kind of situation usually happened in the low-speed rotation of the bearing. 4. Bearing race crack cause crack of the bearing race may be bearing fit tight, loose foreign or bearing inner ring, bearing deformation, inclusive of installation of bearing surface processing etc. 5. Cage fracture, its reason is the insufficient lubrication bearing, seat skew, etc. 6. Retainers metal adhesion on the NTN bearing possibility is bearing was stuck in a cage or insufficient lubrication. 7. Seat ring raceway serious wear and tear may be fall into the object in seat, lack of lubricating oil or lubricant brand is not appropriate. For NTN bearing the large impact load of railroad, rolling mill bearings, etc. , after M quenching the main failure form is: when using inner sleeve cracking when assembling, use in the process of impact outer ring, inner ring fracture, falling guard and isothermal quenching bearing with good impact toughness, surface compressive stress, whatever the assembly inner sleeve craze, or using Chinese and foreign set of guard metal shed and inner sleeve fracture tendency is greatly reduced, and can reduce the edge stress concentration of roller. Therefore, after isothermal quenching than M after quenching self-aligning ball bearing life expectancy and improve reliability.