Study On Parameters Optimization For Hot Stamping Of The A Pillar Reinforced Plate

Hot stamping is a new forming method which combined with traditional heat treatment and cold stamping technology.Because of its development prospects and long-term vitality,since first applied to practice,it has been highly valued by academia and industry.This paper studied in hot stamping process,theory and experimental method.The main research content of this paper is as follow:This paper takes the A pillar reinforced plate as the study object,by chosen a better mold structure,the wrinkle and cracking defects of the part are effectively controlled.Based on the optimization structure of hot stamping,the finite element analysis of the A pillar reinforced plate is designed to pave the way for the following optimizations of the overall formability of the parts.Based on the 3D finite element analysis,the response surface and multi-objective genetic algorithm are combined to optimize the process parameters of A pillar reinforced plate.The Box-Behnken experimentation is designed by choosing the upper and lower binder force,the initial temperature and the friction coefficient as the process parameters and the maximum thickening rate and thinning rate after stamping and quenching as process targets to judge the forming quality.According to the test data from the simulation,establish the response surface through the process parameters and targets.The error in the simulation of Autoform software by predicted optimal parameters is very small,which can fully verifies the accuracy of the response surface prediction.In order to ensure the process parameters after multi-objective optimization could reach the forming quality standard of the A pillar reinforced plate,the metallographic examination is necessary.Through the metalloscope,the microstructure has changed from initial pearlite and ferrite into lath martensite structure,which infers mechanical properties of the part have also changed.After that,the tensile strength was measured by 5 samples from parts.And the experimental result shows that the tensile strength of the parts could reach 1500 MPa.In this paper,research and experiments shows that the combination of finite element analysis,multi-objective optimization technology and experimental verification can be applied into hot stamping parts production.And it can effectively improve the quality of stamping parts and shorten the manufacturing cycle.This new technical method can provide both theoretical basis and practical support for the realization of vehicle lightweight.