日常模具生产中，应注意维护冲切凸、凹模刃口的锋利度。当冲切刃口磨损时，材料所受拉应力将*，从而冲压件产生翻料、扭曲的趋向加大。

In daily mold production， attenti*hould be paid to sharpness of punching and conc*e die edges. When the cutting edge is worn，fastener， the tensile stress of the material will increase， and the stamping and bending will increase.

简单来说钣金件是金属薄板壳体，冲压件就是用拉伸机或冲床等加工的工件1，钣金件在折弯过程中厚度不会有变化，但在汽

车钣金壳体中应为敲击等原因，fastener生产商，一部分表面会有一定变化。冲压厂是不能确定落料尺寸的，fastener生产厂，应该是在定做模具时由模具厂试定出来的。

In a simple way， the sheet metal part is a metal sheet shell，fastener报价， and the stamping part is 1 of the workpiece， which is processed by a drawing machine or a punch press. The thickness of the sheet metal parts will not change during the bending process， but in the steam.

The surface of the automobile shell should be knocked and so on. Part of the surface will change. The stamping plant is unable to determine the blanking size. It should be determined by the mold factory when making the mould.