用环形铣刀五轴加工自由曲面的全局干涉检测

Research on Global Interference of Five-axis Machining of Complex Curved Surface

针对环形铣刀五轴加工复杂曲面的全局干涉问题,提出了一种基于曲面二重网格划分的全局干涉检测算法。首先将加工曲面沿参数方向进行初始网格划分,得到离散网格点并快速排除不与刀具发生全局干涉的网格点;然后分别计算剩余的网格点到刀轴线段的最短距离,找到离刀轴线段距离最近的初始网格点;最后以该网格点为中心的邻域进行局部网格划分找到满足精度的离刀轴线段距离最近的网格点,确定该点的位置及与刀轴线段的最短距离,判断是否发生全局干涉。若存在全局干涉,进行刀具姿态调整。与传统方法相比,该方法极大提高了全局干涉的检测效率,并通过实例验证了该方法具备可行性。

A global interference detection algorithm based on double meshing of surfaces is proposed for the global interference problem of five-axis machining of sculptured surfaces with ring milling cutters. Firstly,the machining surface of the initial mesh parameters along the direction of discrete grid points and fast and exclude interference cutter grid points;then the remaining grid points are calculated respectively the shortest distance of the cutter shaft line to find the nearest line segment from the cutter shaft grid;finally,the local mesh neighborhood in order to find the grid point as the center to meet precision cutter shaft line distance from the nearest grid point,and determine the shortest distance between the point and the cutter shaft segments,to determine whether the occurrence of interference. If the global interference exists,the tool attitude adjustment is carried out. Compared with the traditional method,the proposed method greatly improves the detection efficiency of global interference and proves the feasibility of the method by examples.