针对整体叶轮叶片根部特征加工过程中极易产生过切和欠切的问题,提出了适合光滑过渡曲面区域的叶轮叶片根部特征的精加工的刀具轨迹规划优化方法。该方法首先对叶根曲面进行划分,定义加工曲面类型;然后对加工曲面进行刀具轨迹规划,计算出最佳走刀步长和行距;最后在保证刀具不与被加工表面发生过切和欠切的基础上,使得刀具与被加工曲面在刀触点处平面上每个方向的曲率相匹配,并使生成的刀轨光顺简洁,改善曲面加工精度与加工效率。通过对某叶片根部的仿真实例加工验证了该方法的正确性。该方法在多轴数控加工中具有重要的实用价值。 In view of the problems of overcutting and undercutting in the machining process of the whole impeller blade, the optimization of the tool path planning for the machining of the root of the impeller blade suitable for the smooth transitional curved surface is proposed. The method first divides the root surface of the root to define the type of the surface to be machined; then, the tool path of the machining surface is planned to calculate the optimal walking step and row spacing; finally, to ensure that the tool does not over and undercut with the surface to be machined , Which makes the tool match the curvature of the machined surface in every direction on the plane of the knife contact and make the generated tool path smooth and concise and improve the surface machining precision and processing efficiency. The correctness of the method is verified by the simulation of a blade root. The method has important practical value in multi-axis CNC machining.