冲裁时,冲模中凹、凸模之间的间隙,对冲裁件的断面和表面质量及尺寸精度、冲裁力、退料力、卸料力与顶出力及冲模的寿命都有很大影响。在合理而正常的间隙范围内,可使板料上、下面出现的微小裂纹相互重合,所得断面光亮带较大,而塌角、毛刺及斜度均较小,表面也比较平整,断面与平面质量均可达到理想的效果。所以在设计和制造冲模时,应正确确定与选择凹、凸之间的间隙,对冲裁 Blanking, the punch die, the gap between the punch, hemming pieces of the cross-section and the surface quality and dimensional accuracy, blanking force, withdrawal force, discharge force and ejection force and the life of the die have a significant impact . Within a reasonable and normal clearance range, the tiny cracks appearing on the upper and lower plates can be overlapped with each other, the bright band of the obtained section is larger, the sag, burr and slope are smaller, the surface is relatively flat, the cross section and the plane Quality can achieve the desired effect. Therefore, in the design and manufacture of die, should be properly determined and the choice of concave and convex between the gap, the punching