针对复杂曲面数控加工中刀具与工件的碰撞问题,提出一种基于可视锥理论的刀具碰撞检验方法。根据点的可视性特点推导点的可视锥算法,对任意采样点进行可视锥模型构建,通过刀轴矢量与可视锥的布尔运算判断刀具与工件的碰撞,由此计算刀轴避免碰撞时应转过的最小夹角,并对旋转后的新刀轴矢量是否在机床刀轴可加工范围内进行检验。通过将该方法应用于整体叶轮加工中,可快速检验出发生碰撞的区域并对刀轴矢量进行修正,有效地解决了刀具在数控加工中的碰撞检测问题,为刀具路径规划提供了有效的检验方法。
For the collision problem between cutter and workpiece in CNC machining ot sculpture surfaces, a memoo was proposed for checking cutter collision based on visibility cone theory. The visibility cone algorithm was derived with point visibility, and a visibility cone model on any sample point was established. Boolean operation of cutter ax- is vector and visibility cone was used to judge the collision of cutter and workpiece, and the minimum rotation angle of cutter axis to be rotated was calculated. Whether the new cutter axis was in the feasible cutter orientations was checked out. Through applying this method to the integral impeller machining, the collision detection problem in CNC machining was solved to provide efficient method of tool-path planning.