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图1所示的盒形零件要完成半圆孔R3.5的冲裁,乍看起来是有一定困难的。假如采用直冲,将零件定位在成形凹模上,剐将产生一个严重问题,即半圆R3.5距离零件底面只有0.8毫米(4.8减去3.5再减去壁厚0.5),若下面漏料孔再加大些,凹模实际上等于没有壁了,不但凹模在淬火时要产生断裂变形,在冲裁中它的强度亦将不能承受所产生的载荷而引起破裂。因此,—般都采用铣削加工办法,将此孔铣出,这就不能提高生产率,反而增加了生产成本。
The box-shaped part shown in Figure 1 to complete the semi-circular hole R3.5 blanking, at first glance seems to have some difficulties. If the use of straight, the parts positioned in the forming die, 剐 will have a serious problem, that is, the radius of the R3.5 0.8mm from the bottom of the part (4.8 minus 3.5 and minus the wall thickness 0.5), if the following leakage hole Further more, the die is virtually equal to no wall, not only the die in quenching to produce fracture deformation, in the blanking of its strength will not be able to withstand the resulting load and cause rupture. Therefore, milling methods are generally used, this hole milling, which can not increase productivity, but increased production costs.