点云直接生成模具数控程序的算法研究

 段振云,宋扬,赵文辉

(沈阳工业大学 机械工程学院,辽宁 沈阳 110870)
摘要:根据已有的预处理之后的零件点云数据,提出了一种由点云直接生成模具数控加工程序的方法。主要讨论了如何利用主元素分析法求曲面局部的法向量,并利用曲面的法向量的反向和偏置得到模具的曲面全局法向量,从而计算出模具的刀位点并生成刀位轨迹。介绍了工件坐标系与机床坐标系之间的坐标变换方法,最终求出生成模具的数控加工G代码,并通过实例验证了算法的准确性、有效性。
关键词:点云;模具;曲面法向量;刀位轨迹;坐标变换
中图分类号:TG659 文献标志码:A doi:10.3969/j.issn.1006-0316.2015.04.006
文章编号:1006-0316 (2015) 04-0023-04
Study on the algorithm of generating mould NC program by point cloud directly
DUAN Zhenyun,SONG Yang,ZHAO Wenhui 
( School of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, China )
Abstract:The method of generating mould NC program by the pre-processed point cloud data directly was introduced. This article mainly discussed how to use the PCA method for surface local normal vector and to get the mould surface’s normal vector by the surface of the reversed and offsite normal vector so as to generate the mould surface’s NC tool paths. The method of the coordinate transformation from the work piece coordinate system to the machine tool coordinate system were introduced and the NC program of mould was generated in this paper, and the accuracy and effectiveness of the method are verified by given examples.
Key words:point cloud;mould;surface normal vector;NC tool paths;transformation of coordinates
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收稿日期:2014-10-09
基金项目:辽宁省教育厅科学研究(L2011017)
作者简介:宋扬(1989-),男,河北秦皇岛人,硕士,主要研究方向为现代制造技术与精密测量;段振云(1971-),男,河南辉县人,博士,教授,主要研究方向为复杂曲面设计与加工等;赵文辉(1978-),男,浙江温岭人,博士,讲师,主要研究方向为自由曲面测量与数控加工。
 

 

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