双列圆锥滚子轴承失效分析

对3506/355.6/YA-1双列圆锥滚子轴承的失效原因进行分析。通过断口分析、痕迹对比、硬度、热酸洗、非金属夹杂物、碳化物不均匀性、淬回火组织及网状碳化物等检测,对轴承本身材质及热处理情况进行排查,材质及热处理工艺均符合标准。导致轴承提前失效的原因为内圈A侧其中一粒滚子反向装入轴承,由于滚子大端侧工作面与内圈滚道接触处应力较大,使得内圈产生周向裂纹,最终使得轴承出现异常。

Failure Analysis on Double-row Cone Roller Bearing

The failure reason of 3506/355.6/YA-1 double-row cone roller bearing was studied by fracture surface analysis, trace comparison, hardness testing, and microstructure examination. The results show that the failure of the bearing has nothing to do with the material and heat treatment process it had experienced. It is found that one of the rollers had been reversely installed into the inner ring of the bearing, causing bearing failure in advance. There existed excessive contact stress at the contacting zone between the side face of the roller big end and inner ring raceway, resulting in circumferential crack on the inner ring and eventually making the bearing abnormal.