Surface Cracking Analysis of Bearing Cup Groove

Surface cracking reason of the bearing cup groove was analyzed by means of chemical composition analysis, pickling and macrographic examination, microstructure examination and hardness test. The results show that the surface cracking of the bearing cup groove was the grinding cracking. The large amount of grinding, wear-out grinding wheel and shortage of temper resulted in the grinding burn and the production of grinding cracks on the surface of bearing cup groove.