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加工图1所示的螺栓模模片上的六方孔。我们采用普通环形刃六方拉刀,拉刀齿距按t=(1.25～1.9)L~(1/2)的原则选择,由于孔的长度L短,同时参加切削的齿数减少,拉削不平稳;拉刀齿距选择较小时,容屑槽减少,磨削前角时困难,至使拉刀在工作中容易塞屑,积屑瘤和鳞刺严重,六方孔表面粗糙度达不到要求。为此,我们根据斜角切削的原理,设计制造了如图2所示的螺旋刃渐变式六方
Process the hexagonal holes on the bolt mold shown in Figure 1. We use a common circular edge six-way broach, broach tooth pitch t = (1.25 ~ 1.9) L ~ (1/2) the principle of choice, due to the length of the hole L is short, while participating in the reduction of the number of teeth, broaching uneven ; Broach tooth pitch smaller choice, the chip flute reduction, grinding anterior horn difficult, so that the broach in the work easy to plug the debris, built-up tumor and scale thorn, hexagonal hole surface roughness less than the requirements. To this end, we based on the principle of bevel cutting, design and manufacture as shown in Figure 2 gradient hexagonal spiral edge