• CN:11-2187/TH
  • ISSN:0577-6686

›› 2014, Vol. 50 ›› Issue (15): 198-204.

• 论文 • 上一篇    下一篇

非正交双转台五轴机床后置处理通用方法

周续;张定华;吴宝海;罗明   

  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
  • 发布日期:2014-08-05

General Method of Post-processing for Non-orthogonal Five-axis Machine Tools with Dual Rotary Tables

ZHOU Xu;ZHANG Dinghua;WU Baohai;LUO Ming   

  1. The key Laboratory of Contemporary Design and Integrated Manufacturing Technology of Ministry of Education, Northwestern Polytechnical University
  • Published:2014-08-05

摘要: 针对非正交结构的双转台型五轴机床,提出一种从工件坐标系变换到机床坐标系的逆运动学求解方法。该方法适用于正交及非正交情况下,双转台型、摆头+转台型和双摆头型五轴机床的后置处理问题。分析非正交双转台型五轴机床的结构特点,建立此类机床的通用结构形式。基于点绕空间任意轴的旋转变换公式,建立非正交五轴机床各运动坐标同刀位数据之间的映射关系,实现机床平动坐标和转动坐标的计算。针对机床C轴转动坐标的求解,分析出现奇异位置的情况,给出奇异值问题的处理方法。对整体叶轮流道及叶片加工刀位轨迹进行后置处理,并通过Vericut软件进行仿真试验,验证后置处理方法的可行性和高效性。

关键词: 非正交结构;五轴加工;后置处理;逆运动学;奇异位置

Abstract: For the non-orthogonal five-axis machine tools with dual rotary tables, an inverse kinematics method is proposed, which deals with the transformation matrix from a workpiece coordinate system to a machine tool coordinate system. This method is also applicable for the orthogonal and non- orthogonal five-axis machine tools with dual rotary tables, rotary table-tilted head and dual tilted heads. The general structure of the non-orthogonal five-axis machine tools with dual rotary tables is developed according to the structural features of the machine tools. The mapping relationship between the coordinates of motion and the cutter location data is developed based on the rotation transformation of a point around an arbitrary line. And the translational coordinates and the rotational coordinates of machine tools are calculated. The singular position of the machine axes is analyzed according to the determining of rotation coordinate of c-axis. And the solution for the singularity problem is presented. The toolpaths of the integral impeller machining are posted with the proposed method. And the simulation experiment is carried out on the Vericut 7.0 software which verifies the feasibility and the efficiency of the general post-processing method.

Key words: non-orthogonal structure;five-axis machining;post-processing;inverse kinematics;singular position

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