裁剪NURBS曲面数控加工刀轨干涉处理

Interference Avoidance in NC Tool Path Generation of Compound Trimed NURBS Surfaces

提出一种基于裁剪 NURBS组合曲面的适合于球头刀、平底刀、圆角刀的刀具轨迹干涉检查和消除的算法。该算法将裁剪曲面用三角片逼近表示 ,将刀具轨迹干涉检查和消除问题转化为刀具曲面与三角片的几何相关性测试。通过建立裁剪 NURBS曲面的包围盒等方法进行干涉预处理 ,提高了干涉处理速度 ;推导出不需离散刀具曲面的干涉量计算方法 ,提高了干涉量计算精度。实践表明 ,该算法快速、精确、稳定 ,通用性好。

An avoidance algorithm for machining with ball end,flat and fillet tool based on compound trimed NURBS surface is presented.The approach includes①tessellation of the Trimmed NURBS surfaces into triagles,②interference pretreatment by convex box of surfaces,③interference detection and tool-position correction. It is proved that the algorithm is speedy and reliable.