冲裁时,凸模将压力机的压力施加于放置在凹模表面上的板料上,使一部分板料沿着一定的冲裁轮廓线与另一部分板料分离。当凸模和凹模的刃口分别切入板料后,两刃口连线附近的区域是冲裁的主要塑性变形区。其应力应变状态见图1所示,是轴对称问题。此外,正象一块四周被支承的圆板,中心受到一集中载荷作用而产生弯曲一样,冲裁时板料一般在凹模内也会产生拱弯并发生塑性弯 During blanking, the punch exerts pressure from the press on the sheet placed on the surface of the die so that part of the sheet is separated from the other sheet along a defined blanking contour. When the punch and die cutting edge were cut into the sheet metal, the two edge near the connection area is blanking the main plastic deformation zone. The state of stress and strain shown in Figure 1, is the axisymmetric problem. In addition, just like a circular plate supported by a center, the center is subjected to a concentrated load and is bent. In the case of blanking, the plate will generally bend and plastically bend in the die