我厂生产的电容器主要以铝外壳、铜外壳、银外壳、钢外壳为主。其中银外壳、钢外壳为多次引伸阶梯工件。由于引伸件相对高度大(h/d>2～3以上),相对厚度大(d/D>1.5～2以上),在生产中经常有不同程度的拉裂现象出现。此拉裂现象主要是在二引以后的危险断向处变薄拉裂。根据我厂的经验,当凸凹模 R 一定、润滑一定时,压边力 My factory production of capacitors mainly aluminum shell, copper shell, silver shell, steel shell-based. One silver shell, steel shell for multiple extension ladder parts. Due to the relative height of the extension (h / d> 2 ~ 3 above), the relative thickness (d / D> 1.5 ~ 2), in the production often have different degrees of cracking phenomenon. The phenomenon of this crack is mainly in the second break after the risk of thinning break point. According to my factory experience, when the punch and die R certain, lubrication certain, blank holder force