车灯模具侧花纹无干涉刀具路径规划算法

在分析了车灯模具侧花纹的设计与加工特点后，基于平面与自由曲面求交理论，提出了一种车灯模具侧花纹无干涉刀位路径规划算法．该算法以脱模方向的法平面为参考，求出花纹约束线的投影线段，然后根据加工参数计算出投影线上的离散点．所有离散点处的法平面与组合自由曲面的交线即为刀位轨迹线．最后对刀具路径作了无干涉工艺优化．实例表明，本算法满足由直线和圆弧组成的花纹约束线所定义的车灯模具侧花纹的设计与加工要求．

Algorithm of Non-interference Tool Path Planning of Auto Lamp Mold Side Pattern

After analyzing the properties of the design and the manufacturing of auto lamp side pattern, a non-interference tool path planning algorithm for the pattern was presented, which is mainly based on the intersection theory between a plane and a free-form surface. In the new approach, a projective curve of the key boundary of a side pattern, named pattern-constraint curve, is created on a normal plane of the mold-open direction for reference. Then, discrete points on the projective curve are calculated according to the machining parameters, and the intersection curves between the normal planes through each point and compound free-form surfaces are calculated subsequently. Finally, the tool path is optimized for the interference avoidance. The practical example shows that the algorithm satisfies the design and the manufacturing of a side pattern with lines and arcs composed pattern-constraint curve.