机械工厂的切削加工有两种，分别称为“粗切削”和“精切削”。
There are two kinds of cuts in machine- shop work called, respectively, the "roughing cut" and the "finishing cut".
将正交试验应用到机械加工中，研究了背吃刀量、切削速度和进给量对粗车工效影响的主次顺序。
The primary and secondary factors influence on the efficiency of coarse machinery, which are cutting depth, cutting speed and feed, were studied by applying orthogonal experiment.
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