The Research Of The Equivalent Drawbead Model Based On The Fitting Of Experimental Data And Its Application In The One Step Inverse Algoirthm

In order to deal with the increasingly fierce competition of the automobile market,the automobile enterprises are accelerating technological innovation and constantlyintroducing new models, to meet the needs of the market and expand its productcompetitiveness. In the field of automobile manufacturing, stamping technology isone of the most important core technology, caused each attention of the enterprise.Drawbead technology is a key technology of stamping technology. Drawbead, asmaller proportion of the area in the mold, has complex shapes, studied hard, playinga key role, the frequently used, and with certain universality. Based on the research ondrawbead characteristics, establishment of the relational database between drawbeadrestraining force and drawbead structure size, is very necessary. In the process ofdebugging of the mold, the debugging of drawbead wastes the longest time. So indesign stage of the part and mold, the drawbead optimization can reduce the diedebugging time greatly. So the drawbead research is very meaningful. The drawbeadinvestigation was not as long as stamping, but also it had a very long time, and havemade great achievements. The drawbead is studied through experiment and theoreticalanalysis,two kinds of means. Because of the complexity of deformation of the sheetthrough drawbead, the people without interruption of drawbead theory, has made greatachievements, but people still accustomed to the use of the experimental method. theresearch on drawbead, is a more convenient and effective method.Because the deforming is complexity when the sheet is going through drawbead,it is hard to find a very accurate analytic formula. Some important data are obtainedthrough the experimental method. According to the structure characteristics ofdrawbead, with reference to previous experimental scheme, combined with the actualcondition of the lab, independently we designed an experimental equipment, and hadcarried on the experiment. That to establish this relationship can make the simulationanalysis and the actual production more closely together, to better achieve the usingthe simulation. Based on the analysis of experimental data, some characteristics of thedrawbead structure are verified, and through genetic algorithm procedures that was written independently, we get the relation formula between drawbead structure sizeand drawbead restraining force. In this paper, through the analysis of thecharacteristics of one step inverse algorithm, and the combination of triangle meshcharacteristics, based on one step inverse algorithm, the equivalent drawbead modelwas got and the procedures were written. Finally, with the use of genetic algorithms,and based on one step inverse algorithm, in order to get a reasonable straindistribution, the arrangement of equivalent drawbead were optimized, and finallycombined with the artificial modifications, we got very good results. The optimizationprocedures was realized independently through genetic algorithm procedure, andcombining with the existing one step inverse program. We use this optimized results,combined with the already established the relation between drawbead restrainingforce and drawbead structure size, by which we can quickly design a drawbeadstructure size, thus greatly reduce the drawbead design time, and improve themechanical properties of stamping parts.