| Traditional automotive sheet metal product design mainly rely on experience,75%ofthe products with complex shapes forming defects and process problems are due to theunreasonable design in early stage of product design. Product shape design defects andprocess design flaw has become the vehicle development bottleneck in the process ofvehicle development, for example, before the process design need to determine flangingheight, the flanging point of view, as well as the corresponding addendum shape, but alsoto determine the trimming line position, Traditional methods can only rely on theexperience of the technical staff and simple geometric method, it is often likely to causeflanging shape unreasonable, and the position of trim line is not accurate, so the fieldtryout is relatively difficult. With the development of computer technology, finite elementinverse algorithm can help designers to find the potential defects in the design phase ofproducts, improve design efficiency. Automotive sheet metal design usually uses CATIAsoftware, so developed formability synchronous simulation system for automobile paneldesign based on CATIA user-defined features is essential.This project is founded by the National Natural Science Foundation of China(No.50905066) and the Central Universities Fundamental Research (HUST: No.2012QN044),The subject support by FASTAMP solver based on the improved finite element inverse thealgorithm and DKQ shell the unit, developed the formability synchronous simulationsystem for automobile panel design based on CATIA user-defined featuresThe paper summarizes the finite element inverse approach in automotive sheet metalforming analysis. Under the guidance of ideology of parametric design, put forward thefeature-based design method. Because of the auto cover relatively large size, and localflanging area, the system is divided into two modules, the overall formability analysis andlocal flanging formability analysis. Detailed system interface, and the developmentprocess of the system.In the early stage of product design, designer modify the initial product designrepeatedly to coordinate the size of product, this paper presents an idea of CAD design with CAE analysis model synchronized. By use of CATIA feature model updatemechanism, it solves the technology of CAD design model and CAE analysis modelsynchronization update, including product surfaces, material parameters, processparameters, meshing, neutral layer bias. achieves seamless integration of CAD/CAE.Combined with mesh subdivision system and FASTAMP solver based the inversealgorithm, complete the whole development of formability synchronous simulation systemfor automobile panel design based on CATIA user-defined features. Finally, analyzes theactual automobile sheet metal to demonstrate the practicality and accuracy of the system. |
