当间隙过大或刃口由于磨损而出现圆角后,因材料在刀口处的应力集中的程度削弱,裂纹出现的位置离开刀口更远一些,冲压件的毛刺高度更高一些。由于这些毛刺的根部较宽,并与冲裁件紧密结合,故不易去除。当间隙过小时,毛刺也很大,这是因为上、下主裂纹中闽的多余材料在凸模下行时互相剪切与挤压,除一部分被挤到断面上的凹陷处之外,尚有一部分被挤到冲压件边缘,从而形成根部较窄高度较高的毛刺。这种毛刺是附着于冲裁件的边缘的多余材料,与裁冲件结合力 When the gap is too large or the edge of the fillet due to wear and tear, due to the material at the edge of the stress concentration is weakened, the location of the crack occurred farther away from the knife edge, stamping parts of the burr height higher. Because these burrs have a wide root and are closely attached to the blanking member, they are hard to remove. When the gap is too small, the burr is also large, because the upper and lower main cracks in Fujian extra material in the punch down and shear and squeeze each other, except for a part of being pushed into the depression on the section, there are A portion is pushed to the edge of the stamping to form a burr with a narrower root height. This burr is attached to the edge of the blanking the excess material, with the blanking member binding force