本文分析了一种采用三轴联动加工2维极坐标系工件的运动规律,发现以轮廓曲线的法线转角为参变量,可以对极坐标平面中的任意圆弧曲线建立一个圆的参数方程,从而可以构造一个极坐标数控系的圆弧插补器对圆弧进行插补运算。应用本文提出的方法,编制了一个软件插补运算程序,在我厂生产的MK8532 CNC数控曲线磨床上进行了试验,结果证实了本文论点的正确性。 In this paper, we analyze the motion of a 2-D polar coordinate system workpiece by 3-axis machining. It is found that by taking the normal rotation angle of the contour curve as a parameter, a circular parametric equation can be established for any arc curve in the polar coordinate plane, Which can construct a polar coordinate CNC system of circular interpolation interpolator for the arc. Using the method proposed in this paper, a software interpolation operation program has been compiled and tested on the MK8532 CNC numerical control curve grinder manufactured by our factory. The result proves the correctness of this article.