Research And Application Of The Assembly Process Planning Technology Based On Virtual Reality

The conventional task of assembly process planning is accomplished by the salted process designer according the 2D drawing manually commonly, and it often needs mock-up assembly. This mode of assembly leads to many problems unavoidably, such as low optimization, low efficiency of design, and high cost. The current CAAPP technology also exists some problems, such as"combination explosion". The assembly process planning technology based on virtual reality is a valid approach to solve these problems. The paper researches the assembly process planning based on virtual reality carefully, and the finished work includes:The paper analyzes the requirements of the assembly process plan system based on virtual reality, brings up the structure of the system on the foundation of the analysis, and designs the rock-bottom database.The paper researches the key technologies of assembly process planning based on virtual reality. The main work include: It founds the parts'bottom information model of the system, realizes the model's information transformation from Pro/E to virtual reality; It presents a improved AABB level bounding box collision detection algorithm. The algorithm enhances the efficiency of collision detection and satisfies the system's need. It presents the realization and workflow of dynamic constraint recognition and realizes part's accurate positioning based on their mate and constraint relations; It presents two different assembly modes, interactive constraint defining assembly mode and automatic constraint recognition assembly mode. This method makes up the single assembly mode's bug and let the assembly process be more lifelike. By catching part's sampling orientation point, the paper realizes assembly path's record, display and edit. By screen recoding and video compressing technology the paper realizes the record and playback of the assembly process planning course; It presents the constitution method of assembly process rules in virtual assembly process planning system.The paper researches the disposal technology of assembly process information based on virtual reality. The paper brings up the technology of dynamic generation of assembly process document based on WEB and XML, and realizes the flexible customization of the style of assembly process documents and remote transfer. At the same time, the paper brings up the technology of assembly process display and teaching in locale based on WEB and multimedia which makes the workers master the assembly process more quickly.Based on the above research work, the paper develops a virtual assembly process planning system IVADS with VC and WTK. Then the advantage of the technology of assembly process planning based on virtual reality was verified by the satellite product's assembly process planning in IVADS.