一、反向液压引伸法及其特点: 反向液压引伸法,就是用凸模将坯料压入充满液体的凹模内,利用凹模腔内液体产生的反压力辅助成型的一种引伸法。反向液压引伸模的基本结构如图一。 普通引伸模进行引伸比过大的引伸时,位于凸模端部边缘的板料往往承受过大的拉 First, the reverse hydraulic extension method and its characteristics: Reverse hydraulic extension method, is to use the punch pressed into the liquid filled die, the use of cavity fluid pressure generated by the auxiliary forming an extension method. The basic structure of the reverse hydraulic drawing die as shown in Figure 1. Ordinary extension die Extensions than the extension ratio is too large, the punch at the edge of the sheet is often subjected to excessive pull