Research On Optimization Of Stamping Process Parameters And Springback Compensation Of Automobile Special-shaped Beam

With the improvement of the country’s industrial level,the modern automobile industry is developing rapidly.In the rising demand for automobiles,the high standard of safety and light weight of automobile manufacturing has become an important direction for the development of automobile industry.In order to shorten the time to be able to stand out in the new round of market competition,so it is especially important to produce qualified automotive coverings.However,defects such as rupture,wrinkling and springback are common in the process of stamping and forming ofhighstrength steel.This paper takes the Shaped beams of a model as the research object,and solves the defects generated during the forming process by combining the finite element numerical simulation technology with mathematical optimization and springback compensation.According to the structural characteristics of the shaped beam,we analyze the forming process,design a reasonable stamping process,design the process according to the designed process,and apply DYNAFORM software to simulate and analyze the stamping process.By analyzing the simulation results of three types of tie-bar arrangement,the best tie-bar arrangement for shaped beam forming is obtained,and trimming analysis and rebound analysis are performed on the basis of the forming of this tie-bar arrangement.In order to improve the forming defects of the Shaped beams,this paper applies the optimization method combining numerical simulation technique and response surface method.Four process parameters(blank holder force,friction coefficient,draw bead resistance coefficient,die closing clearance),which have a great influence on the part quality,are selected as optimization variables to design BBD experiments,and a response surface model is established to analyze the influence law of single variable and multivariate interaction on the part forming quality.The response surface model was solved by using Design-expert 13.0 software,and 100 sets of non-inferior solutions were obtained,among which the appropriate solutions were selected as the best combination of process parameters after this optimization.DYNAFORM software was applied to simulate the part under this parameter combination,and the maximum thinning rate of 23.868% and the maximum rebound of 7.765 mm were obtained.For parts that still do not meet the production requirements after optimization,DYNAFORM software is used to compensate for the springback of the mold surface.After three iterations of compensation,the final rebound of the part was controlled within the range of 2 mm.The optimized combination of parameters and the final compensated mold surface were used to simulate and test mold production,and the thinning rates of the simulated and real parts were 24.393% and 23.22%,respectively.The thickness and thinning of the simulated part and the real part were compared at the same position,and the thickness and thinning rate of the real part were similar to those of the simulated part,which verified the accuracy of the optimization scheme and was of great significance for the subsequent production.