关键词: 定位误差, 尺寸链, 矢量角度, 优化技术, 工件

Abstract: In order to analyze and calculate location errors and to ensure the machining accuracy in the fixture design, based on the vector angle and optimization technology, the automatic calculation approach for location errors was proposed. Firstly, according to the assembly relationship between the workpiece and fixture, a search approach to dimension chain was established to pass contact points. And then, based on the vector angle calculation approach, the dimension chain with location errors was converted to constrained optimization problem so as to realize automatic calculation of location errors. The proposed method provided the basic theory for the development of computer aided fixture system.

Key words: location error, dimension chain, vectorial angular, optimal technology, workpiece