在农业机械和通用机械上,象图1所示的零件用得很多。在这些型鋼或鋼板上加工孔,在一般工厂中,由于产量大小的不同,采取着不同的制造方法。大批生产多采用专用复合冲模或专用連續冲模冲制。成批和小批生产,除了采用单孔連續冲模和簡单冲孔模以外,大部份采用落后的划线鑽孔法,遇到下規則形状的孔(如椭 In agricultural machinery and general machinery, the parts shown in Figure 1 are much more used. In these steel or steel plate processing hole, in the general factory, due to different production sizes, take a different manufacturing method. A large number of production and more use of special compound die or dedicated Chong Chong Chong system. Bulk and small batch production, in addition to the use of single-hole continuous die and simple punching die, the majority of the use of backward scribing drilling method, meet the rules of the shape of the hole (such as oval