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絲錐方尾冷冲成形目前已普遍采用(見图1、图2)。其优点为:生产率高、节省材料、操作方便。目前各厂冲方的規格为M10～12以下。現正在向扩大規格的方向发展。当前存在
Taps square tail cold red forming is now widely used (see Figure 1, Figure 2). Its advantages are: high productivity, save material, easy to operate. At present, the specifications of the factory red side M10 ~ 12 the following. Now to expand the direction of the development. Currently exists