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钢管零件上的孔,历来都是采用钻孔或铣孔工艺。例如,某管材零件上需要若干个固定铆钉、螺钉的孔(图1),则需
Hole on the pipe parts, traditionally used drilling or milling process. For example, a certain number of pipe fittings need to be fixed rivets, screw holes (Figure 1), you need