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针对弧面凸轮的非等径侧铣加工存在法矢异向误差的问题,为寻求加工误差最小的刀具位置,分析了理论非等径刀轴曲线的性质,根据等距曲面的误差传递关系,结合偏置点寻优算法进行刀位优化,提出了一种以非等径刀轨曲面与拟合直纹面误差最小为目标的双向搜索刀轴优化算法.在此基础上,通过遗传算法得到较高精度的优化数值解,并将解算出的刀轴端点作为初始数据,利用NURBS(非均匀有理B样条)插值反算重构侧铣加工刀轨直纹面.数值计算和仿真结果验证了该算法的有效性.
In order to solve the problem of anisotropy error of normal vector in non-equilateral side-milling of arc cam, in order to find the position of the tool with the smallest machining error, the properties of the curve of the non-isometric knife shaft are analyzed. According to the error transfer relationship of isometric surface, Combining with the optimization algorithm of the bias point to optimize the cutter position, a bidirectional search cutter axis optimization algorithm with the aim of minimizing the error between the non-equivalent cutter path surface and the fitted ruled surface is proposed. On this basis, The numerical solution and the simulation results verify the accuracy of the numerical solution and use the end point of the tool shaft calculated as the initial data to reconstruct the side face of the tool path by using NURBS (non-uniform rational B-spline) interpolation. The effectiveness of the algorithm.