Research & Development Of Visual Assembly CAPP System Based On Three Dimensional CAD

Assembly CAD/CAPP and its relative technology have become hotspots and development trends with the coming of various advanced manufacturing technologies. As a part of national 863 Modern Integrated Manufacturing Systems project "CAPP Based on Three Dimensional CAD", visual assembly CAPP system based on three dimensional CAD is studied and developed in this paper. On the basis of research on the basic theory of assembly CAD/CAPP and its development at home and abroad, according to the integration characteristic of assembly CAD/CAPP system and the current development trends of CAD technology, combining advanced visual manufacturing technology, fuzzy mathematics theory and operational research knowledge, this paper carries on the detailed design and research on visual assembly CAPP system based on three dimensional CAD, and presents its whole frame, structure and realized methods. In the analysis and research process of the overall system, some more effective methods are proposed in view of special details, and this system is proved and realized through assembly technology design of gear reducer. In the course of its development, this system mainly applies dismantable direction inference based on assembly restraint, assembly interference inspection matrix and algorithm, geometry inference technology based on three dimensional assembly process, optimized method based on parallel multi-level evolved algorithm, graph geometry transformation based on three dimensional assembly simulation and so on, which enhanced the actual performance of this system greatly. The successful application of these new methods enables this system to syncretize visual technology and assembly CAPP organically, thus realizes "three dimensional visual assembly" of products really. Visual assembly CAPP system based on three dimensional CAD is developed on the platform of SolidWorks2005. This system is made of such six models as three dimensional standard components storehouse establishment, three dimensional assembly information withdrawing, three dimensional assembly technological design, three dimensional visual assembly/disassembly technology, optimization and appraisal method based on three dimensional assembly process, assembly craft design of gear reducer. Thereby computer–aided visual assembly technology design based on three dimensional CAD is realized. In summary, visual assembly CAPP system based on three dimensional CAD is developed in the foundation of research on its essential technologies in this paper. And its research results will provide the powerful support for further and overall research on three dimensional visual assembly design and manufacturing.