The generation of residual magnetic bearing parts in the process, influenced by a variety of electrical equipment and electromagnetic fixture clamping and positioning inevitably be magnetized to produce strong magnetic. Because of this magnetic presence of fine metal powder bearing parts in the process (grinding, lapping) generated is adsorbed on the channel and the rolling element bearing, easy to wash away. Bearing in use, remaining in the bearing channel or raceway fine metal powder on noise, vibration, rotation accuracy and service life of the bearing is large, resulting in bearing temperature rise, early damage.

Working surface burns mainly operators in the grinding bearing outer ring raceway channel and when the feed is too large, inadequate cooling or not timely grinding wheel are likely to face in the processing of locally generated high temperatures, so that the local annealing produce burns. Burns bearing surface has a direct influence on bearing life, at work, on the one hand to guide the bearing while rotating bear a greater load bearing parts due to the work surface burns, hardness decreased, resulting in the channel or raceway surface early fatigue spalling, greatly reduces bearing life.