Bearing surface form of fatigue failure is a failure, main performance for fatigue crack initiation, expansion and fracture process, under alternating load generated by the fault of the long-term effects of the metal. Cracks in two aspects:
First: on the surface, this is, tapered roller bearing in the process of moving contact, because in the work of plastic deformation and strain hardening on the surface of the contact stress on the surface of the cyclical changes caused by the effect of external load, and finally on the inner surface of the small FANADE Bearings - SKF Bearings http://www.fagbearings-hk.com/ from the development, the formation of surface crack between the two, because Xie into the lubricant on the surface of the work, the strength of open, serious blow on the wall, crack force to move forward;
Second: from the surface, under the pressure of repeatedly, the surface contact, where initially exposed on the surface of a certain depth of crack, and along the surface direction Angle, to a certain depth, since on the surface of contact area, and beyond the surface, and the ultimate formation of corrosion, leaving a horse pit.
On the surface, from surface cracks, these two goals (part carburizing, quenching and other surface heat treatment, after if have uneven hardness, organization, and the average internal stress and other adverse, the contact stress is generally have the opposite under the influence of ground fissures, if parts surface quality is poor, there is a defect (oxidation and decarburization), friction or poor lubrication, from the surface crack.
INA bearings after installation, in order to check whether installed correctly, check for running. Small mechanical can rotate with the hand, to confirm whether to rotate smoothly. Check project has caused by foreign bodies, scars, creasing seized up, due to bad installation, installation of seat processing bad moment is not stable, because the clearance is too small, installation error, seal friction caused by the torque is too big, and so on. If there is no abnormal can start power operation.
Dynamic operation, from the beginning of the no-load speed, slowly up to the rated operating conditions. Test run to check the items, whether there is abnormal sound, tapered roller bearing temperature, lubricant leakage or discoloration, and so on. If discovery is unusual, should immediately stop, check machine, when it is necessary to remove the bearing inspection.