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By rolling bearing failure, and deterioration of performance parameters to judge and predict the reliability and performance of the bearings, parts of the abnormal situation, causes and risks to be identified and judged, decided to fix and improve methods of integrated technologies. Therefore, SKF bearing fault detection of the fault diagnosis technology of not merely (or monitoring) technology, it is not just a spot inspection instrumentation. Acquisition signal correctly, quickly and effectively, data processing, manual or automatic identification and judging. In order to determine the repair cycle of science, should also be based on various types of failure mechanisms, for the necessary tests and estimate of fatigue, wear life.
Fatigue failure was a failure of the surface form of FAG bearings, mainly for fatigue crack initiation and extension and fracture process, the long-term effects of alternating load resulting from failure of metal. Cracks in two ways:
1, and from surface Shang see, this is NSK bearing in scroll contact process in the, due to in work surface of plastic deformation and strain hardened surface of contact stress cyclical changes by caused of external load of role, and finally in small crack from development of within surface, in both Zhijian of surface crack of formed, due to work surface of lobby doors wedged into lubricant, open of power, severe against in wall Shang, forced crack forward advance;
2, the surface layer, under repeated pressure, surface contact, initial cracking at exposed places on the surface of some depth of cracks, surface direction and point of view, to a certain depth from surface of contact surface, and go beyond the surface, corrosion and eventually split, leaving a Ma Hang.
From rolling bearing surface Shang see, also is from surface layer of crack, this two a target (parts carburizing, quenching and other surface heat treatment, Hou if has hardness not uniform, organization, and non-uniform of within force and other adverse, is contact stress General is from produced instead of underground crack of effect Xia, if parts surface quality poor, exists a defects (oxidation, off carbon), friction or lubrication bad, from surface crack. Control Raceway acoustic method are: selection of low noise bearing corrugated-small bearings, carefully select the conditions of use. Acoustic noise affecting the entire machinery of the Raceway, Raceway reduction can reduce the noise of the machinery as a whole.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| NNU4980 NTN | 400 | 540 | 140 |
| NNU4976K NTN | 380 | 520 | 140 |