基于曲面控制点重构的加工误差在机测量方法  

On-machine measurement method of machining errors based on reconstruction of surface control points

作　　者：吴石[1] 王宇鹏 刘献礼[1] 潘高杰 朱美文[1] WU Shi;WANG Yupeng;LIU Xianli;PAN Gaojie;ZHU Meiwen(Key Laboratory of Advanced Manufacturing and Intelligent Technology,Ministry of Education,Harbin University of Science and Technology,Harbin 150080,China)

机构地区：[1]哈尔滨理工大学先进制造智能化技术教育部重点实验室,黑龙江哈尔滨150080

出　　处：《计算机集成制造系统》2024年第6期2080-2089,共10页Computer Integrated Manufacturing Systems

基　　金：国家合作重点研发资助项目(2019YFE0121300);国家自然科学基金国际(地区)合作与交流资助项目(51720105009)。

摘　　要：为了提高汽车车身外覆盖件模具的加工精度,提出一种在机测量自由曲面加工误差的方法。首先基于改进波前法生成三角网格,提取理论曲面网格节点的坐标数据,根据在机测量得到实际加工曲面的采样数据;然后基于T-splines的小波控制点法进行曲面重构,拟合加工曲面;最后基于广义牛顿法计算重构的实际曲面控制点到理论曲面的法向距离,获得曲面的加工误差分布,并对实验加工的凹凸曲面样件的轮廓度误差进行分析。实验结果表明,基于T-splines控制点法的曲面重构方法能够在机、有效地获得自由曲面的加工误差。To improve the machining accuracy of large-scale automobile outer cover molds,an on-machine measurement method of free-form surface machining errors was proposed.The triangular mesh was generated based on the improved wavefront method,the coordinate data of the theoretical surface mesh nodes were extracted,and the sampling data of the actual processed surface was obtained according to the on-machine measurement;then the surface was reconstructed based on the wavelet control point method of T-splines,and the processing curved surface was fitted;the normal distance from the reconstructed actual curved surface control point to the theoretical curved surface was calculated based on the generalized Newton method,the processing error distribution of the curved surface was obtained,and the profile error of the experimentally processed convex-concave surface sample was analyzed.The experimental results showed that the surface reconstruction method based on the T-splines control point method could effectively obtain the machining error of the free-form surface on the machine.

关 键 词：在机测量 加工误差 曲面重构 T样条 小波控制点法 

分 类 号：TH164[机械工程—机械制造及自动化] TG806[金属学及工艺—公差测量技术]