一、设计方法在机械制造中,常在钢板上冲制深穴,但加工时常出现裂缝,这给模具设计与制造带来很大困难。在图解计算方法的提示下,根据几何形状,列出一个K值表(见表1)。即: K=圆心角所对弦长/圆心角所对弦长+材料的伸长量根据表中K值对应的圆心角可计算出模具冲穴不产生裂痕的最小半径。实践证明,该方法简单易行。表1 First, the design method In machinery manufacturing, often punching deep holes in steel, but the processing often cracks, which gives mold design and manufacture of great difficulties. At the prompt of the graphical calculation method, list a K-value based on the geometry (see Table 1). Namely: K = center of the chord / center angle of the chord length of the material + elongation According to the table in the K value corresponding to the central angle can be calculated mold punch hole does not produce cracks in the minimum radius. Practice has proved that the method is simple and easy. Table 1