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针对复杂通道类零件五坐标端铣加工中全局干涉问题,提出一种基于临界约束与临界位置精细化的干涉处理方法。通过分析刀杆碰撞干涉特点,以切触点处垂直于走刀方向平面与被加工曲面交线为基础,计算刀具的初始临界位置。在零件坐标系下,建立自动编程刀具轮廓函数,基于初始临界位置,选定与刀具临近点集。在刀具坐标系下,采用距离监视的方法计算点集到临界刀轴的距离,判断干涉点集,计算与之对应的刀具旋转角度集,选取最大的旋转角,从而确定出无干涉刀轴矢量。算例结果表明,该方法能够快速确定干涉检测范围,准确生成无干涉刀位轨迹。
Aiming at the problem of global interference in the five-coordinate end milling of complex channel-like parts, an interference processing method based on critical constraint and critical position refinement is proposed. By analyzing the characteristics of the interference of the cutter bar, the initial critical position of the cutter is calculated based on the intersection of the plane perpendicular to the cutting plane and the line of intersection of the machined surface. In the part coordinate system, the automatic programming tool outline function is established. Based on the initial critical position, the set of adjacent points of the tool is selected. In the tool coordinate system, the method of distance monitoring is used to calculate the distance between the point set and the critical tool axis. The set of interference points is determined, the corresponding tool rotation angle set is calculated, and the maximum rotation angle is selected to determine the interference vector . The experimental results show that this method can quickly determine the range of interference detection and generate accurate trajectories without interference.