Research On Forming Numerical Simulation And Springback Of Automotive Structural Part Based On Autoform

With the rapid development of automobile industry,the requirements of lightweight carbody and the minimization of fuel consumption and the maximization of collision safetyperformance are more and more prominent. The high-strength steel has a great advantage inimproving strength and guaranteeing safety, so more and more great attention are paid in thecar manufacture. However, due to the properties of high yield strength and high tensilestrength, the high-strength steel in the stamping process prone to wrinkle, crack, drawinginadequate and springback. These problems increase the difficulty in the quality control ofparts and the mould design,thus improving forming defects of high-strength steel hasbecome a hot research field. At present, the most effective measure to improve formingdefects is the application of CAE software for numerical simulation of sheet metal instamping process before actual production to predict forming defects and shortcomings ofmold design deficiencies based on the simulation results, then the defects can be controlledby means of optimizing the processing technological parameters and mold motionparameters. The advantages of the application of finite element numerical simulationtechnology are to shorten the development cycle of mold, improve the forming quality ofstamping parts and create a lucrative business interests.The article carry on study around actual production, the main research content isdivided into three aspects:Firstly, the formability of DC03high-strength steel was studied based on L-shaped part.The springback problem of the straight-wall part of L-shaped part is most serious throughsimulation analysis. For the straight-wall part of L-shaped part, the influence of the materials,the combination of blank holder force and draw bead, friction coefficient, punch the gapbetween die, punch corner radius on springback has been deeply researched. Simulationresults show that the higher of yield strength and tensile strength of materials, the larger ofthe springback height. The springback height decreases with the increase of blank holderforce and friction coefficient while increases with the increase of the punch the gapbetween die and punch corner radius. In general，the condition of out of springback tolerancecan be improved by means of optimizing combination of the blank holder force and draw bead collocation.Secondly, the stamping process of the DC03automobile front floor reinforcing platestamping part has been studied by numerical simulation technique by Autoform finiteelement simulation software. According to the results of simulation, the forming qualityimproved by means of the optimization of process parameters and the reasonablearrangement of virtual draw bead of equivalent variable intensity based on the research andanalysis on the wrinkle and crack defects. Finally,the final process optimization program wasdesigned.Finally,the springback after the stamping forming of front floor reinforcing plate partwas reseached by Autoform finite element simulation software. The problem of springbacktolerance was studied carefully,and the best solution of die compensation method was putforward to solve the problem of springback out of tolerance,and then compensate for theoriginal digital appliances in the Autoform software and verify the feasibility of the program.Stamping process simulation analysis prior to the actual production by the application ofnumerical simulation technology can predict the process of stamping defects, and thehigh-strength steel forming springback tolerance issues can be judgment accurately. It canprovide a theoretical basis for the design of the mold design as well as optimize the stampingprocess parameters of the actual production, and make the various performance indexes ofthe forming of front floor reinforcing plate part meet production requirements.