从机械构件失效痕迹学角度 ,对轴承保持架制造加工过程的宏观、微观痕迹特征进行了细致的观察与分析 .结果表明 ,一次拉深成型过程中 ,在保持架内凹根部萌生了周向微裂纹 ,冲裁侧孔时由于凸模刃口过度磨损变钝致使冲裁力过大 ,引起了裂纹迅速扩展 ,导致了保持架开裂失效 From the point of view of failure of mechanical components, the macroscopical and microscopic features of the bearing cage are carefully observed and analyzed.The results show that in the deep drawing process, Blanking the side hole when the excessive wear and tear caused by excessive wear and tear on the punch edge resulting in excessive blanking force, causing the rapid expansion of cracks, resulting in failure of the cage cracking