在用金属板制造中等尺寸和大尺寸零件时,常常需要在零件的几个部位上进行冲不同尺寸的孔、加深成形、精整等。例如,在制造由伸出底和焊接圆柱体所组成的洗衣机的机槽时,为了将机槽固定在机体上和形成可见的水准线记号,在圆筒上必须冲四个孔。当油箱完全装配和抛光后,在油箱上部圆周上必须冲十个孔,并压出容纳螺钉头的凹槽。这些孔是用来将两个手柄和挤压装置固定在油箱上。在这种情况下,孔的相对位置需要有较高的精确度。类似的工序可以借助安装在压力机上的专用模具进行。但是,为了加工中型和大型零件,照例需要大的 In the manufacture of medium-sized and large-size parts with metal plates, it is often necessary to punch holes of different sizes in several parts of the part to deepen the forming, finishing and the like. For example, in manufacturing a machine slot made up of a washing machine that projects out of the base and a welding cylinder, four holes must be punched in the cylinder in order to secure the slot to the body and to form a visible level mark. When the tank is fully assembled and polished, ten holes must be punched in the upper circumference of the tank and out of the groove that holds the screw heads. These holes are used to hold the two handles and the press on the tank. In this case, the relative position of the holes requires a higher degree of accuracy. A similar process can be done with a special mold mounted on the press. However, in order to process medium-sized and large-sized parts, as usual, large ones are required