The Research Of Synchronous Simulation System For Automobile Panel Design Based On CATIA

Automobile panels with complicated shape and big overall dimensions always needmany forming processes and demand high surface quality. It contain complex localflanging shape, which is difficult to form. In the actual product design phase, designersmainly rely on experience or simple theories, which lead to many potential defects inproduct design, seriously affecting mold design and manufacture cycle and quality. Withfinite element technology widely applied in automotive panels forming, finite elementinversion algorithm has been applied to the product design phase, which can quicklypredict product formability and avoid the forming defects caused by unreasonable shapedesign. Automobile panels design usually use CATIA software, so developing formabilitysynchronous simulation system for automobile panel design based on CATIA is essential.This research is one part of major projects of national NC named:"Developingstamping die in overall side, fender and interior of new environmentally friendly materialsof C-class car"(No.2010ZX04014-072). The research is based on CATIA and FASTAMPsolver, developing the system which helps the designers to predict product and flangingformability, get the accurate blank line and trimming line, and check trimming edgestrength. It greatly improves the efficiency of product design.The paper provides an overview of system development tool CAA and automaticoptimization for automobile panel design based on CATIA user-defined features, as wellas finite element inverse algorithm and trimming edge detection algorithm. The subjectdeveloped the general framework and processes for the system, combined with thedemand for automobile panels design, and completed the system interface, inheritedCATIA operating style and user habits.The paper focuses on the key technology in system development process. The systemmaking full use of Rep, which is the temporary objects of CATIA, achieve to display thelarge-scale post-processing data quickly, without building features and organizingtopological relationship between features. The system realizes the quick search of localinformation and inquiries by taking advantage of CATIA dynamic response technologyand the spatial grid and area algorithm. The system making full use of the update mechanism of CATIA features, succeed to associate the product formability analysis withthe product shape. By modifying the geometry, the system achieves to make automaticoptimization design for the automobile panels.The paper analyzes beam structure, fenders, door handles. By analyzing the productformability, assessing the surface quality and springback rules, unfolding the blank and thetrimming line, checking the trimming edge strength, and being compared withexperimental results, the paper verifies the accuracy and feasibility of the system.