论文部分内容阅读
0Cr18Ni9不锈钢具有良好的塑性与较大的延伸率,因此它具有良好的拉深成形性能。但由于它的冷作硬化指数很高,在进行深拉深成形或进行两次以上的拉深成形时可能因此而产生端口裂纹;另一方面,加工过程中因拉深间隙大小及金相组织的变化引起残余应力,也可能引起开裂。纵向开裂有时发生在拉深变形之后,当拉深件由凹模内退出时立即发生,有时在拉深变形后经过一段时间存放或在使用过程中产生,所以危害很大。 1.残余切向应力的分析 宏观来看,竖向开裂是因制件口部存在极其薄弱
0Cr18Ni9 stainless steel with good ductility and elongation, it has a good deep drawing properties. However, due to its cold work hardening index is very high, deep drawing in the deep drawing or forming more than two may be caused when the port crack; on the other hand, due to processing depth gap size and microstructure The change causes the residual stress, may also cause the crack. Longitudinal cracking sometimes occurs after drawing deformation, occurs immediately when the drawing member is withdrawn from the die, and sometimes after a certain period of time after drawing is deformed or stored during use, so it is very harmful. 1. Residual tangential stress analysis macroscopically, vertical cracking is due to the existence of artifacts mouth is extremely weak