在三轴曲面加工中，曲面加工质量与刀位轨迹的质量有紧密联系。在使用当前的计算机辅助设计(CAD)/计算机辅助制造(CAM)集成软件生成刀位轨迹时，若仅采用通常的0.01mm公差，在加工时有可能出现表面凹坑、光洁度较差等缺点。为解决上述问题，提出一种基于网格均匀化的刀位轨迹优化方法，在Cimatron生成的加工刀位轨迹基础上，通过建立主导轮廓线并对不规则的点进行修正来降低相邻刀路倾斜度变化的程度；然后对同一条刀路上的刀位点进行光滑连续直线段的识别；再采用分段3次样条进行拟合，以提高同一刀路上的曲线光滑程度。仿真实验与实际加工实验表明，本方法可以消除原来存在的表面凹坑，有效地提高最终的表面加工质量。

In machining 3-axis sculptured surface, the quality of machined surface has a close connection with the quality of tool path. When the tool path is generated by using current CAD/CAM integrated software and a tolerance of 0.01mm is set as usual, the machined surface would probably have such disadvantages as surface dents, poor roughness. To solve this problem, a tool path optimization method based on mesh uniformization is proposed in this paper. Based on the original tool path generated by Cimatron, We construct the dominant contour and modify the irregular points to reduce the variety of the inclination degree between the succeeding paths, then identify the smooth continuous line segments along the same path and fit the smooth continuous line segments by using piecewise 3-order spline curve to improve the smoothness of curve along the same path. Simulation and actual machining experiment verify that the proposed method can eliminate the dents on the surface and improve the final machined surface quality effectively.