多轴加工无干涉刀具路径生成算法研究

Research on Multi-axis Machining Tool Path Generation Algorithm

多轴数控加工中刀具路径的计算直接影响加工零件的精度和加工效率。本文介绍了一种平底刀多轴无干涉刀位轨迹生成算法,在刀轴方向上消除干涉量。首先对参数曲面进行三角离散化,根据曲面相应点的法矢布置初始刀具位姿。构造曲面和刀具的OBB模型,通过包围盒间的快速相交测试得到刀具与曲面的干涉三角片,在此基础上,采用解析方法计算刀具与干涉三角片在刀轴方向上的干涉量,修正刀位点,最后得到无干涉刀位轨迹。

The generation of multi-axis tool path under multi-axis NC machining is the key impacting factor to machining accuracy and efficiency.This paper presented the multi-axis tool path generation algorithm for a flat tool.At the beginning,distract the parameter surface into triangles,layout the initial cutter location data（CL data）,search interference triangle by the rapid bounding box intersection test between the tool OBB model and the surface OBB model,and then calculate the interference distance by analytical methods（along the direction of tool axis）,modify cutter location data,and finally generate the interference-free tool path.