Stamping Simulation Study On The Lower Extension Panel Of Automobile Rear Floor

With the improvement of living standard,the automobile has become an indispensable tool,market demands for automobile is increasing,accelerating the development of the auto industry and appearing new models constantly.Covering parts replaces the fastest in all parts of the car. Automotive covering parts usually has a relatively small thickness, complex shape, high surface quality requirement,etc,So the traditional development need to constantly test covering parts stamping process and debug mold, which is able to determine the final product and need a longer development cycle.Therefore, shorten the development period of covering parts is a challenge for automakers.Stamping is a key stage of covering parts forming.Combining the finite element analysis with computer can generate CAD/CAE/CAM computer aided simulation technology to gain the need forming technology by stamping on covering parts.This can greatly reduce the product development cycle and become the main direction of the development of mold design.The article main in lower extension panel of rear floor,using AUTOFORM software numerical simulation analysis and calculation, studying the characteristics of the forming and the influence of process parameters so that identify a specific production process parameters. The main work and conclusions are as follows:1.This paper introduced the automobile panel stamping forming, numerical simulation technology development application trend and development mode advantages of modern mold; This paper also introduced the yield criterion, numerical simulation key technology, main manifestation of forming defects, defective parts to form criterion and criterion.2.The parts of the process were preliminary analysis, process parameter setting, simulation has been initially forming results. On the basis of preliminary simulation results, with the greatest reduction rate and the maximum thickness as a measure of the standard, using of orthogonal experiment to study the effects of different process parameters on the forming process of thin rate(1)The blank size and unit stress reduction, the probability of wrinkling appears smaller. To ensure the forming sheet required under the premise, the original blank inward offset, this is, conducive to the transition of the thinning area decreases.(2)With the increase of BHF, maximum thickening rate decreases, the thinning is more and more serious. In order to ensure the thinning and thickening rate to meet the requirements of the premise, increased within a certain range of BHF can reduce wrinkling.(3)Setting drawbead is the most effective control board material flow method, can reduce the stamping forming process problem of wrinkling and stretching quality defects.(4)With the increase of friction coefficient, blue and grey area shrinking.(5)With the die fillet radius decreases,the blank feeding resistance to change, the phenomenon of wrinkling and insufficiently drawing is greatly reduced.(6)A comprehensive analysis should be appropriate to increase the drawbead, the flow resistance increases B, weaken the wrinkling phenomenon. The specific parameters of blank holder force 330 KN 0.65, drawbead and friction coefficient 0.15, die fillet 4mm. Optimized for stamping parts.The basic elimination of quality defects, to meet the requirements of the production standard.3.At last, the paper introduces the mechanism, influencing factors and the compensation method of springback. The springback simulation and analysis are made on the connecting plate of the rear floor.