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当型腔含有孤岛时,使用传统环切铣削方法加工往往难以避免拐角方向存在突变的问题,故提出一种螺旋刀轨生成算法,实现含凸边界孤岛型腔的快速铣削加工。首先在孤岛和型腔的加工轮廓上设置放样点,将放样点连接成放样线,线性插值放样线生成螺旋折线;接着插入以指数函数规律分布的控制顶点,并以其所定义的任意阶B样条曲线规划最终刀轨。所生成的刀轨能适应孤岛偏心的情况。实验结果显示,与传统环切相比,高阶连续的B样条曲线刀轨可直接用于具有NURBS插补功能的加工中心,孤岛轮廓的加工精度高,可有效避免刀轨方向突变,降低切削力的变化幅度,提高加工效率。
When the cavity contains an island, it is often difficult to avoid the problem of sudden change in the corner direction by the conventional ring milling method. Therefore, a helical tool path generation algorithm is proposed to realize rapid milling with islanding cavity with convex boundary. Firstly, set out the lofting points on the processing contour of the island and the cavity, connect the loft points to the lofting line, and the linear interpolation lofting line to generate the spiral polyline; then insert the control vertices distributed regularly with the exponential function, Spline planning the final tool path. The resulting tool path can adapt to the island eccentric situation. The experimental results show that the high-order continuous B-spline track can be used directly in the machining center with NURBS interpolation function compared with traditional loop-cutting, and the contour contour of the island can be processed with high precision, which can effectively avoid the sudden change of the track direction and reduce Cutting force of the rate of change, improve processing efficiency.