The Research On Bridge Crane Trolley Assembly CAPP System Based On Parametric Assembly Model

With the popularization of the3D-CAD technology, it will be more and more intense bymeans of digital process to improve the core competence of the process design departmentand remove the demand of manufacturing divide in the deepening of enterpriseinformatization application today. As a result, the comprehensive application of the3Dtechnology gradually becomes the main theme and the development trends of enterpriseinformatization. The traditional assembly CAPP system based on the2D-CAD doesn’t meetthe requirements which from design to process information integration. Moreover, it can’tachieve the three-dimensionalization of assembly process and the visualization of industrialfield instruction. Thus it goes against the enterprise informatization process.In this paper, the assembly CAPP system architecture of assembly model based onparameterization was presented. And the key technology achieving the function of assemblingCAPP was studied in parametric CAD rapid design platform. It aims to realize the integrationof parametric design and assembly process planning, and the assembly process documents andvideos in the two forms guiding field assembly process. The main research works are asfollows:(1) Oriented parametric design and the modeling method with automatic assembly wereresearched on the basis of national standard file-the3D modeling of mechanical products.Parametric template models integrating process information have been established and themapping from CAD design information to assembly process information was accomplished.Meanwhile, the model base of purchased components was built.(2) The system design alternatives were investigated and the system architecture wasconstructed, which is mainly consist of five function modules: Role Privilege Management Module, Parametric Design Module, Assembly Process Planning Module, Assembly ProcessSheet and System Diagram Generated Module.(3) The key technology of the assembly CAPP system, including parametric modeldriving, assembly sequence planning, assembly process knowledge base establishing,assembly process simulation, assembly process video, automatically rendering, was studiedand the assembly sequence planning method based on the layered orientation graph was putforward. Furthermore, assembly process simulation and automatically rendering were finishedby the use of Solid Edge interface function. Simultaneously, the function of assembly processvideo was implemented by the use of VB calling Windows media encoder9SDK coder.(4) The parametric assembly CAPP system of bridge crane was developed on the basis ofSolid Edge platform. At last, the technological process, the new contract-parameterconfiguration-model driven-assembly process planning-process sheet-automatically assemble,was completely realized.In conclusion, the traditional design and manufacturing pattern of bridge crane will bechanged with the utilization of the assembly CAPP system. Therefore, it is beneficial to speedup the enterprise product marketing and the rapid reaction capacity of enterprise to marketwas enhanced at the same time.