一、引言在数控车削加工中，由于车削余量较大，需多次走刀才能完成粗加工。根据零件毛坯形状（棒料、锻件和铸件）和零件表面轮廓形状，具体的走刀路线可分为纵向切削循环、横向切削循环和等轮廓切削循环三种方式。其中等轮廓切削循环方式适合了表面轮廓具有复杂或凸凹变化较 I. Introduction CNC lathe machining, turning allowance larger, multiple passes to be completed roughing. According to the part blank shape (bar, forgings and castings) and part surface contour shape, the concrete path can be divided into longitudinal cutting cycle, horizontal cutting cycle and contour cutting cycle in three ways. The contour contouring cycle is suitable for the surface profile with complex or convex-concave changes