Numerical Simulation And Process Optimization Of Drawing Forming For Cover Parts Of Auto

Drawing forming is first process of the sheet metal forming methods,which widely used to various fields of the national economy.The drawing forming quality directly related to the product quality, the latter process and products quality. With the extensive application of stamping products,the quality requirements is increasingly high.Along with the CAE software are widely used in the majority of die companies and automotive OEMs and a lot of practice has been Proved accuracy of CAE analysis results.Drawing forming CAE analysis can forecast the stamping product’s defects in advance, help technician to optimize the drawing forming process, reduce the number of repeated repair mould, shorten the production cycle of the product.There are so many factors affect the drawing forming, that it is great blindness relying on the traditional debugging.It just can get more reasonable stampings forming process,but it can not got the best combinations of process parameters of drawing forming.It need further study to get the best combination of process parameters of drawing forming process.In this thesis, the study object is the auto inner door plate and the drawing forming process parameters research tool is a common plate metal forming software Autoform. Firstly, according to the structural characteristics of the parts draft a reasonable forming process and use3D finite element software Autoform to modeling.Design drawing digital-to-analog and use Autoform software to numerical simulation of deep drawing process.Because drawbead coefficient is determined based on experience sheet inflows,so should view simulation results to find it. Secondly, based on practical experience to select affect sheet drawing forming factors and evaluation design orthogonal experiment.On the base of orthogonal experimental simulation results,use the range analysis to get various factors affect the trend of evaluation.Thirdly,the subject make use of composite optimization in stamping numerical simulation first time and adopt composite optimization to optimize the orthogonal experiment results. Because of the improved simplex optimization method is a function optimization,while drawing forming process parameters optimization is process optimization, so it can not to evaluate advantages or disadvantages by the objective function.Do comprehensively weighted grading to orthogonal experimental and establish objective function.It changed several objective optimization to a multi-objective optimization, which will be transformed into composite optimization, and then get the best combination of process parameters. In addition, use six sigma optimization to find the optimum combination of parameters of drawing forming, and compare to composite optimization’s results, find the best group in the two sets of optimal parameters as a site debugging standard.Finally, base on the site best group optimal process parameters to identify the deviation reasons of the site with the CAE analysis and give solutions.In the study of the best combinations of process parameters on the car door panels,give sheet forming CAE analysis one reasonable way to get the choice of process parameters.