凸模工作条件分析 在冷冲压中,当冲裁的孔径小于或接近于材料的厚度或孔的冲裁质量和精度要求较高而采用小间隙冲裁时,将使冲裁的难度增加。对冷挤压的最后一道工序——冲孔,其材料由于多次冷作硬化,材料剪应力提高,冲裁力上升,使冲孔凸模极易损坏。此时凸模的刃口部分要承受相当大的冲击载荷,回程 Punching working conditions analysis In cold stamping, when the blanking aperture is less than or close to the thickness of the material or hole blanking quality and precision of the higher requirements of the use of small gap blanking, will make the blanking more difficult. The last cold extrusion process - punching, the material due to multiple cold hardening, material shear stress increases, the punching force increases, so that punching punch easily damaged. At this point punch edge part to withstand considerable impact load, return