Research on the Best Contact State of Precision Assembly Based on Data Registration

A method to determine the best contact state of precision assembly based on data registration is proposed for the effects of form error and its distribution on the assembly precision and the unknown contact state after assembly. The distribution character of geometric form error is analyzed. A method to determine the contact point is proposed using data registration technology. And the best contact state is solved based on particle swarm optimization (PSO). On this basis, the small displacement torsor (SDT) is used to express the form error of part surface, and the contact error is calculated to predict assembly accuracy based on contact point. The proposed method is verified by a case study. The results show that it is of great significance to predict the assembly precision by using the data registration method to determine the assembly contact state. Meanwhile, the distribution of form error has also an important influence on the assembly precision, which cannot be ignored in the research on precision assembly.