弹簧在热处理后往往会出现歪斜、凸肚、自由长度不足或弹力不符设计要求等缺陷。造成这些缺陷的主要原因不外乎加热不当或冷却时速度不一所致。过去热处理工作者大都企图通过工夹具来加以控制,但是在加热和冷却过程中工夹具本身也会变形,因而这些 Springs tend to appear after the heat treatment askew, convex belly, the lack of free length or elastic does not match the design requirements and other defects. The main reason for these defects is nothing more than improper heating or cooling at different speeds. In the past, heat treatment workers mostly attempted to control by the jig, but the jig itself was also deformed during heating and cooling. Therefore, these