汽车覆盖件模具不等间隙压边工艺建模

Research on modeling of variable holding tolerance for automotive stamping die

在汽车覆盖件模具调试过程中,调节压边力分布是有效控制板料流动、改善零件成形性的重要手段。针对模具企业目前普遍采用不等间隙压边的工艺设计方法,即将拉深筋区域外侧的压料面空开,拉深筋区域及内侧压料面强压,以实现"外松内紧"的优化压边作用效果,大幅降低压料面区域研配工作量。该文采用弹性力学方法,对该工艺作用机理进行理论分析,推导不等间隙型面高度差的设计原则,并以工程实例验证了该工艺方法的可行性。

Blank holding force is very important for automotive stamping die try-out. It＇s often be adjusted to control sheet flow speed and improve stamping quality. Currently variable holding tolerance is commonly used for stamping die design. The holding tolerance of outside zone of drawhead on hinder face are normally larger than sheet thickness, which of inner zone of drawbead on binder face are normally smaller than or equal to sheet thickness. The distribution of blank holding force is mainly set on inner zone to achieve the effect of ＂tight inner loose outside＂. This paper analyzed the action mechanism of variable holding tolerance, and proposed the computer model of tolerance design. Finally, an example is tested to verify the process and proposed computer model.