Determine whether removing the re-use of imported bearings, INA bearings after cleaning to inspection, carefully check the raceway, the raceway, with the surface state, the wear of the cage, rolling mill bearing clearance is increased and whether the impact of size decline in accuracy injury, abnormal. Non-separable type of small ball bearings, etc., then the inner flat end with one hand, rotate the outer ring to confirm whether smoothly.

     Bearings and other separable bearings, rolling elements can be, the outer ring raceway were examined.

     Large bearings rotated by hand because they can not pay attention to check the rolling body raceway, cage, ribs noodles appearance, INA Bearing the importance of checking the higher the need to be cautious.

     Determine the bearing can be used again, according to the extent of bearing damage, mechanical properties, importance, operating conditions, inspection intervals, and other related factors to decide. But check if found to have the following defects, the rolling bearings can not continue to use, need to be replaced with new bearings.

     A: On the surface, this is, bearings in rolling contact process, due to the work surface of the plastic deformation and strain hardening surface contact stress caused by cyclical changes in the role of external loads, and finally in the small cracks from developing the inner surface of the surface between the formation of cracks, wedged into the surface as a result of the lubricant, open force to crack down on the wall, forcing the forward crack.

     II: from the surface layer, the repeated stress, the surface contact, the exposed surface of the first place in a certain depth of the cracks cracks and angle of the direction along the surface to a certain depth from the surface of the contact surface, and beyond surface, and eventually the formation erosion stripped, leaving a Makeng.   On the surface, or from cracks in the surface layer, these two goals (parts carburizing, quenching and other heat treatment of the surface, and if it has uneven hardness, organizations, and non-uniform stress and other negative, then contact stress generally the opposite from the cracking of ground, if the parts of the surface quality is poor, there is a defect (oxidation and decarbonization), rubbing or poor lubrication, the surface cracks.