Research On Experimental And Numerical Simulation Of Stamping Forming For Automobile Front Fender

At present,the automobile manufacturing industry is in the rapid development process,the demand for the diversification and differentiation of automobile modeling is higher,and the aesthetic feeling and difference of modeling are inseparable from the stamping process of automobile.In order to improve the market competitiveness,the profile size,positioning and installation accuracy,surface quality of body panel are increasingly stringent.Because the surface modeling of the body panel is very complex,and the size of the contour is large,the panel surface is prone to sunken,bulge,uneven,corrugated,fold,cracking and other quality defects.The body outer cover is usually formed by blanking process,drawing process,trimming process,shaping process,side flanging forming process and punching process,according to the structure,profile and size of the panel,and the process layout will change.In the above processes,the stretching process is the most important part of stamping forming of outer panel,and the quality defects of stamping parts of the outer panel drawing process depend on the guarantee capacity of stamping process,and the success of the whole stamping process is directly decided.In this paper,the stamping process of the front fender is simulated by the autoform software of the current author unit,the feasibility of stamping process is analyzed in the preliminary modeling and data design stage,and the stamping direction of each process is determined,and the process parameters and the initial shape are set.The selection of mold parameters and setup in numerical simulation plays a vital role in numerical simulation,the effect of simulation results is great,the influence of friction coefficient,pressure-pad-force side force,brake bead parameters and other key process parameters are analyzed.According to the analysis results,the best process parameter group and automobile fender stamping process plan are established,and the process die of front fender is successfully designed.Combining the stamping equipment of the factory production line for stamping and test,the ideal front fender parts product is obtained.In this paper,the process simulation of stamping parts by numerical simulation technology can analyze the causes of quality defects quickly and effectively,and establish the process plan,process parameters adjustment and optimization measures,optimize mold design structure,shorten the development and manufacturing cycle,unnecessary human,material and financial loss to the lowest,while surface quality and contour accuracy are improved.First of all,research and analysis of stamping process and design principle of the automobile front fender,follow the design principles to determine the final plan of stamping DL map,and according to the press DL,determined to meet the strength and stiffness requirements of the mold structure.Secondly,the front fender stamping process was simulated using finite element simulation software autoform,and the key parameters affecting the forming quality of the blankholder force,friction coefficient,drawbead parameter analysis and optimization.The simulation results show that when the blank holder force is 320 KN,the friction coefficient is 0.15,and the drawbead parameter is 0.4(the edge angle of 0.15),the simulation results of the front fender are the best.Finally,by using the finite element software simulation of the optimal key process parameters,set the automatic production line equipment,and combined with the debugging of the mold to the actual production of the front fender.The actual production of the front fender through the fixture,three coordinates,matching around the size of the outline and installation of point precision,matching verification,finally get a good strength,stiffness and surface quality of the front fender.First of all,this paper calculates the BHF and friction coefficient setting interval according to the existing results,through the finite element software to simulate the stamping process,It is concluded that when the forming effect is the best,the specific value of BHF,friction coefficient is.Secondly,the new project with a car under development which uder the author's unit,put forward a variety of debugging method of front fender mold,and in the actual project development process,the debugging method of the die for the application and get a better surface quality of front fender.Finally,through the actual production proves the combination die design and parameter optimization which can be obtained with good strength,stiffness and surface quality of the front fender.