通常使用普通冷冲压工艺冲制成的工件截面一般只有三分之一左右是光洁的,其余三分之二忱截面是粗糙为撕断面。当对这些粗糙的截面有精度和光洁度要求时,工件就必须再进行创、铣、磨、锉、研等加工。如果我仍采用精冲模冲制,一道工序就可以冲截出光洁度较高的工件,工件断面的光洁度可达甲 Commonly used ordinary cold stamping process into the workpiece cross-section is generally only about one-third is smooth, the remaining two thirds of the rough section is torn surface. When these rough cross-section accuracy and finish requirements, the workpiece must then create, milling, grinding, filing, grinding and other processing. If I still use punching die, a process can be punched out of the workpiece with high finish, the workpiece surface finish up to a