Affect the INA rolling mill bearing service life analysis of the causes

Judge remove when imported bearing can use again, to check after cleaning in the INA bearing, carefully check the raceway surface, rolling surface, cooperate with the state, the abrasion of cage, rolling mill bearing clearance whether to increase, and presence of falling damage, abnormal size precision. Non separation of small ball bearings, etc. , the inner ring with one hand flat end, rotate the outer ring confirm whether smooth. This type of bearings bearing separation, rolling body, the outer ring raceway surface can be respectively. Large bearing can't rotate with the hand, pay attention to check the rolling element and raceway surface, cage, guard surface appearance, such as the importance of INA bearings, the higher the more need to be careful to check. Judge bearing can use again, according to the damage degree of bearing, mechanical properties, importance, and operating conditions, the factors related to inspection cycle to decide. But check if found any of the following defects, rolling mill bearings can't continue to use, need to replace new bearing. A: on the surface, this is, imported bearing in the process of rolling contact, because in the work on the surface of the plastic deformation and strain hardening on the surface of the contact stress cyclical changes caused by the effect of external load, and finally on the inner surface of the small crack from development, in the formation of the surface crack between the two, because Xie into the lubricant on the surface of the work, the power of the open, crack down on the wall, crack force to move forward; Under the pressure of two: from the surface, again and again, the surface contact, the first where exposed on the surface of the crack depth of a crack, and along the surface direction Angle, to a certain depth, since on the surface of contact area, and beyond the surface, and finally form the corrosion, leaving a horse pit. On the surface, or from the surface of the crack, the two objectives ( Part carburizing, quenching and other surface heat treatment, if after have uneven hardness, organization, and the internal stress of non-uniform and other adverse, the contact stress is generally have the opposite under the influence of ground fissure, if parts surface quality is poor, there is a defect ( Oxidation and decarburization) Poor lubrication, friction or from the surface crack.