Abstract: In order to make quantitative analysis of the interference situation during insertion and fit of large components, a template based interference detection technology is proposed. The template is customized according to the CAD model of insertion and fit characteristics. After match with scanning data, the template is taken as the reconstruction model to take part in the interference analysis. The insertion characteristic is discretized into a series of parallel sections perpendicular to the assembling direction, and the penetration depth, clearance and interference demarcation line of each section relative to the fit characteristic in the process of motion is calculated. The integration of interference situations of all sections constitutes the interference situation of insertion and fit characteristics. This method simplifies the 3D intersection problem to a 2D one, and not only can calculate quantitatively the penetration depth and clearance but also can give the interference distribution of assembly parts. Based on this, the handling of follow-up assembly is guided quantitatively. Finally, through the simulated interference detection and analysis of a pair of insertion and fit characteristics, the interference results including maximum interference quantity and distribution are. given, which verifies the feasibility of the proposed interference detection technology.

Key words: Interference detection, Interference distribution, Point cloud, Template