航空学报 > 2010, Vol. 31 Issue (10): 2103-2108

复杂通道类零件五坐标加工全局干涉处理方法

南长峰, 吴宝海, 张定华   

  1. 西北工业大学 现代设计与集成制造技术教育部重点实验室
  • 收稿日期:2009-11-25 修回日期:2010-03-01 出版日期:2010-10-25 发布日期:2010-10-25
  • 通讯作者: 张定华

A Global Interference-free Tool Path Generation Algorithm for Five-axis End Milling of Complex Tunnel Parts

Nan Changfeng, Wu Baohai, Zhang Dinghua   

  1. The Key Laboratory of Contemporary Design and Integrated Manufacturing Technology, Ministry of Education, Northwestern Polytechnical University
  • Received:2009-11-25 Revised:2010-03-01 Online:2010-10-25 Published:2010-10-25
  • Contact: Zhang Dinghua

摘要: 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。

关键词: 复杂通道类零件, 刀轴矢量, 临界约束, 五坐标端铣, 干涉

Abstract: Focusing on the global interference in five-axis end milling of complex tunnel parts, a new method which avoids interference by critical constraint and the calculation of precise critical position is presented. Based on the features of global interference and the intersection line between the plane perpendicular to the direction of cutter moving and the surface to be machined (SM) in the cutting contact (CC) point, the initial critical position is calculated. In the part coordinate system, the function of the auto-program tool (APT) cutter flank is constructed, and the point set close to the cutter-flank is selected based on the critical position. In the tool coordinate system, the minimum distance between the cutter and the point set is calculated and the collision points are selected by using the minimum distance algorithm, and the corresponding rotatable angle set is obtained. The safe angle which is larger than any other angles in this angle set is selected to determine the collision-free cutter orientation. The results show that this method can quickly determine the region of collision detection, and generate an interference-free tool path.

Key words: complex tunnel part, cutter orientation, critical constraint, five-axis end milling, interference

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