Abstract: Aiming at the problems of the slow loading speed of large complex 3D models and the low assembly efficiency due to the large number of components during assembly, an lightweight method based on feature suppression of assembly is proposed. Based on a thorough analysis of the assembly structure and the retention of the assembly interface, a method of breaking the parent-child relationship of assembly constraints and the idea of feature path extraction were proposed. Firstly, a lightweight representation of a complex assembly is realized by means of irrelevant component suppression, suppression according to volume suppression ratio, slight feature suppression. Then, a feature restoration technology is put forward to achieve feature restoration of the lightweight model. Finally, Creo 2.0 is taken as a secondary development platform which combined with MFC dialog technology to develop an assembly lightweight system for enterprise product model testing. Experimental results show that the lightweight model obtained by the system has obvious simplification effect, and the amount of model data is greatly reduced. It not only accelerates the loading of the model, but also improves assembly efficiency.

Key words:  assembly interface, lightweight method, feature suppression, feature restoration, dialog