Research On Stamping Forming Numerical Simulation And Spring Back Control Of The Vehicle's Front Longeron

With the development of China's automobile industry,CAE computer-aided simulation technology has been widely used in the design and production of auto parts.It is an important auxiliary tool for the design of automobile stamping die to the numerical simulation technology of sheet metal stamping based on finite element theory.The numerical simulation of sheet metal stamping can effectively predict the defects such as wrinkling,cracking,spring-back,impact line and slip line in the forming of sheet metal,and these defects can be improved by the corresponding process improvement and parameter optimization to improve or eliminate.In the actual production,CAE analysis technology can greatly shorten the mold development cycle,reduce the number of test mode,improve production efficiency and reduce production costs.In this paper,the vehicle's front longeron is taken as the research object,and its finite element numerical simulation is carried out.According to the simulation results,the defect such as wrinkling,cracking and spring-back appeared.In order to meet the requirements of production,the optimization of the process plan and the optimization of the relevant parameters are carried out and the method of control the spring-back is improved.Firstly,this paper introduces the application range of numerical simulation technology of automobile sheet metal forming and the development status at home and abroad.According to the needs of the project,Dynaform and Autoform software are selected as the finite element analysis software of the vehicle's front longeron,Design-export software as the experimental design and parameter optimization software,and Matlab software as the genetic algorithm optimization software.Secondly,through the study of the function of the software,the finite element model of the vehicle's front longeron is established,and the corresponding numerical simulation analysis is carried out to analyze the possible defects after the parts are stamping.According to the stamping result,the process improvement and finite element analysis of the vehicle's front longeron are carried out.The results show that the defects caused by the forming process can be improved obviously by optimizing the fillet and increasing the drawing bar.On the basis of this,the four process parameters such as blanket force,drawbead radius,drawbead height and friction coefficient are optimized by using Latin square test and genetic algorithm,so as to obtain the effective control of stamping defects of the combination of process parameters.Finally,on the basis of the study of the rebound control method,the spring-back of the vehicle's front longeron is simulated and analyzed.It is found that the edge area of the part after the final shaping process is too large to rebound,for which the method of compensating the edge area in the normal direction is adopted,and finally the spring-back is controlled within a reasonable range.This study provides a useful reference for the improvement of production technology.