Development of prototype system of calculation software in 3D location error

ZHANG Qiang， WU Yu-guang
（College of Mechanical Engineering， Hangzhou Dianzi University， Hangzhou 310018， China）

Abstract：In order to solve the problems such as lack of the automatic mechanism of establishing the calculating model，complicated calculating method，low generalization and so on，a new method was presented to calculate the fixture location error of the model using the mechanism rod group analysis. Firstly，the rod groups in the equivalent mechanism of the work-fixture system were classified. The location calculating subroutines of the mechanisms were programmed by C++ function heavy-load mechanism，and the information such as the size and tolerance of the working procedure system were initialized as the input parameters of the calculating subroutines. Then，the divided mechanisms were combined according to the assembling relation of the work-fixture system. Finally，the location error was calculated by calling the subroutines. Some instances were utilized to verify the location error and the result was compared with the one from extremum method at the end of this article. The results show that the calculating precision of the location error has been improved，and it is available to solve the location error with the mechanism rod group analysis.
Key words：fixture；location error； assur-group method； mechanism representation model； location?calculating?subroutine