Numerical Simulation Analysis Of Drawing Forming Of Aluminum Alloy Front Panel For A Typical Vehicle

Structure parts are important part in the automobile,the stamping technique is an major method of processing production.In order to cope with the global energy and pollution crisis,domestic and foreign car companies have launched their own all aluminum body model,aluminum alloy structure in the automotive applications are becoming more and more extensive.In comparison with the steel plate,,the formability of aluminum alloy sheet is worse and the rebound law is not good.Therefore,it is important to study the die and process of aluminum alloy stamping.In this paper,numerical simulation of the drawing process of front plate of aluminum alloy automobile structure is carried out.The drawing process and die structure of the front plate are designed according to the characteristics of the front plate parts and the properties of the aluminum alloy.The forming defects of the main process parameters are analyzed.The simulation results are verified by experiments.The results show that the proper increase of blank holder force and increasing the resistance of the drawing resistance can effectively control the flow of sheet material,which can not only prevent the wrinkling of the parts,but also reduce the springback.The blank holder force of the front panel is between 21.4 and 64.2;the strength range of the drawbead is between 40.5 and 121.6N/mm;the mold gap is between 1.2mm～1.5mm.The surface deformation of stamping parts is relatively complete,and there is no deep drawing phenomenon.The wrinkle part falls in the process supplementary surface(The process surface will be cut off in the back sequence).After optimization,the blanking force is 42.8,the clearance between the convex and concave molds is 1.35mm,and the resistance of the deep drawing ribs is 121.6 N/mm as the final process parameters.There are no obvious wrinkles and cracks in the forming area of the front panel.The test results prove the products produced under the forming scheme meet the requirements of product design,and the numerical simulation technology can effectively predict and control the forming defects and springback of the aluminum alloy cover parts,thereby improving product design efficiency and forming quality.