A 3D Convex Hull-Based Approach for Fitting a Datum Reference Frame and Evaluating Composite Position Error

摘要：

　　The evaluation of geometric error is of great importance in the process of precision assembly.Although many efforts have been devoted to studying this issue,a challenge still remains.In this study,a 3D convex hull-based approach for fitting a datum reference frame(DRF)and evaluating the composite position error is presented.Specifically,considering the constrained degrees of freedom(DOFs)of the datums,the samp1ing points collected from a coordinate-measuring machine(CMM)were used to fit the DRF first,using 3D convex hull theory.Second,the positiona1 relationship between a datum coordinate system(DCS)and a measuring coordinate system(MCS)was used to transform the coordinates of the sampling points.Third,the mathematical models of pattern-locating error and feature-relating error were developed.Then,using the minimum zone and dichotomy methods,the value of the composite position error was obtained.Final1y,the accuracy of the proposed approach was validated by evaluating the composite position error of a pattern of holes.Because the proposed approach establishes the DRF first and then considers the effects of the error existing in the DRF in the evaluation process,it is expected to increase the accuracy of the evaluation of composite position error.

关键词： 3D convex hull composite position error error evaluation pattern of holes precision assembly

作者: Zhang ZhiQiang Liu JianHua Zhao Ning Ding XiaoYu

作者单位: School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081 State Key Laboratory of Smart Manufacturing for Special Vehicles and Transmission System,Baotou 0140

会议类型: 国际会议

会议名称: 第十七届国际制造会议(The 17th International Manufacturing Conference in China)(IMCC 2017))

会议地点: 深圳

会议语种:英文

页码: 1-17

在线出版日期: 2017-11-23（万方平台首次上网日期，不代表论文的发表时间）