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为了大批量加工具有一级精度、▽9光洁度的液压件阀孔(见图1),我们曾按通常设计资料介绍的拉刀结构设计制造了推刀并在压力机上进行精加工试验。经多次试验都出
In order to mass-produce the first-order precision, ⑨ 9 finish hydraulic valve hole (see Figure 1), we designed and manufactured the pushknife according to the broach structure described in the usual design documents and performed the finishing test on the press. After many tests are out