自由曲线的轮廓常用离散点来表示，而不是已知的数学方程，评定其轮廓度误差非常困难。
The profile of the random curve is expressed not by mathematical equation but by discrete points, which makes it very difficult to evaluate the profile error.
该算法只需要三次等距即可计算出凸台和凹槽加工刀轨，并且能够处理包含自由曲线的轮廓。
A new tool path generation algorithm was presented to eliminate interferences, when nesting convex mold and concave die were machined with tool paths calculated by offsetting the 2D profile directly.
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