实际生产中,常要加工多孔且孔边值很小的机械零件。对于这类问题,多用钻孔法加工。显然,对单件小批量生产是可行的。但对大量生产,则是效率低,成本高。因此,必然考虑采用生产效率高的冲压加工方法。然而,它却受到冲裁最小孔边值限制。根据冷冲压有关资料介绍,普通冲裁工件的冲孔边缘与工件内外形边缘不平行时,孔边值b_(min)≥t_o(料厚),平行时,b_(min)≥1.5t_o,而精密冲裁工件的孔边值 b__(min)=0.6～0.7t_o,本 In actual production, it is often necessary to machine porous mechanical parts with small hole edge values. For such problems, multi-purpose drilling process. Obviously, a single small batch production is feasible. But for mass production, it is inefficient and costly. Therefore, we must consider the use of high-productivity stamping methods. However, it is limited by the minimum hole edge value for blanking. According to the relevant information of cold stamping, when the punching edge of the ordinary blanking workpiece is not parallel with the inner and outer edge of the workpiece, the b_ (min) ≥t_o (material thickness) of the hole edge and b_ (min) ≥1.5t_o when parallel, Precision blanking workpiece hole edge value b __ (min) = 0.6 ~ 0.7t_o, the