Residual Stress’s Impact on Grinding Distortion of the Bearing Ring
Abstract：With regard to the issue of distortion from grinding of the thin wall-thickness bearing rings, it is mentioned to go through analysis or discussion from the riew-point of internal stress. Conclusion is to take adjusting the heat-treat process as the main while taking adjusting the grinding process as the subsidiary. By this method we seek a final solution of the issue of distortion from grinding of the thin wall-thickness bearing rings. Key words：bearing rings, distortion of grinding, residual stress, process of quenching and tempering. 1 引言 本公司是一家专门生产轴承的外资企业，生产品牌的调心滚子轴承。在生产过程中，经常出现套圈粗磨后直径变动量（VDP）超差，后道工序无法消除而报废的问题。检查结果为：①原材料质量符合美国ASTM A29 标准；②马氏体和残留奥氏体组织级别分别为1-2级，屈氏体级别＜1级，回火硬度HRC60-62，热处理变形满足JB/T 1255标准；③经过反复试验，排除磨削工艺参数不合理及设备问题的可能性；④套圈的磨削变形统计见表1。
