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图1所示的冲压零件,特点是弯曲件两侧壁或拉伸件周壁上有一定几何精度要求的孔。对这种孔的加工,常采用四种加工工艺:(1)弯曲前展开冲孔。(2)弯曲(或拉
Stamping parts shown in Figure 1, characterized by the bending of both sides of the wall or the tensile wall has a certain geometric accuracy of the hole. Of this hole processing, often using four kinds of processing technology: (1) pre-bending punching. (2) Bending (or pulling