This paper discusses a few of shapes of retain ring after hydraulic expansion, and uses the e-lastic -plastic finite element method to analyses the influencing factors of the shape.

• 介绍了护环外补液液压胀形后护环成形形状的几种类型,论述了采用弹塑性有限元法分析产生这几种形状的影响因素,对护环的生产具有一定的指导作用。