Stamping Forming And Springback Analysis Of 5182 Aluminum Alloy Automobile Windshield

5182 aluminum alloy has the characteristics of strong corrosion resistance and fatigue resistance,which is widely used in the production of automobile covering parts and automobile structural parts.The research shows that in the production process of automobile body structure,stamping has the characteristics of high production efficiency,high processing accuracy and relatively low processing cost,so it plays an important role in industrial production.The production cost of warm forming is much higher than that of room temperature forming.In addition,the use of warm forming stamping in the production process will also cause additional energy consumption for the heating of die and sheet metal,so it is particularly important to carry out the research of room temperature forming.However,at present,there is little research on the mechanical properties and process parameters of 5182 aluminum alloy at room temperature.Therefore,this paper studies the mechanical properties and forming quality of 5182 aluminum alloy by changing different process parameters.The main contents are as follows:In this paper,the automobile windshield beam of a certain brand is taken as the research object,the different process parameters of stamping forming are analyzed,and the influence of forming process parameters on springback of automobile windshield beam is mainly studied.At room temperature,the uniaxial tensile tests were carried out on 5182 aluminum alloy standard samples in the rolling direction of 0°,45° and 90°,and the strain rates of 0.01s-1,0.1s-1 and 1s-1 respectively.The true stress-strain curves of 5182 aluminum alloy were determined.The formability of 5182 aluminum alloy at room temperature was studied.The results show that the mechanical properties of 5182 aluminum alloy are affected by the strain rate and The influence of rolling direction.Under the same strain rate,the tensile strength and elongation are the highest when the rolling direction is 0° and the yield strength is the highest when the rolling direction is 90°,but the difference in each direction is not obvious;in the same rolling direction,with the increase of strain rate,the tensile strength and elongation are decreasing and the yield strength is increasing;based on the uniaxial tensile test of 5182 aluminum alloy,the constitutive equation is established The forming limit curve of 5182 aluminum alloy is obtained by cupping experiment,which provides theoretical support for the prediction and numerical simulation of forming limit of 5182 aluminum alloy at room temperature.Secondly,aiming at the problem of thinning and springback of automobile windshield beam,the forming speed,friction coefficient and die clearance are selected as process parameter variables,and the influence rule of single factor on thinning and springback is analyzed.The results show that the larger the forming speed is,the smaller the springback is;the larger the friction coefficient is,the smaller the springback is;the larger the die clearance is,the greater the springback is.Taking the maximum springback as the objective of forming quality,the response surface model was established by the composite experiment of design center.The accuracy of response surface model fitting was verified by the determination coefficient R2 of 0.9896 and R2adj 0.9710.By using the response surface model,the effect of the interaction between the three process parameters on springback is discussed.Among the three factors,the biggest one is die gap,and the smallest one is forming speed.Finally,on the basis of numerical simulation,experiments are carried out to verify that the forming speed,friction coefficient and die clearance in numerical simulation are selected to carry out stamping experiments.Compared with the simulation value and prediction value,the actual rebound size is measured,the maximum error with the simulation value is 10.5%,and the maximum error with the prediction value is 5.9%.The reliability of response surface model is verifiedThrough the research of this subject,it shows that the comprehensive application of numerical simulation and actual stamping can effectively predict the springback of forming parts and shorten the R&D and trial production cycle of the whole vehicle This technical idea can provide theoretical basis and technical support for the trial production and mass production of the new car body structure parts and cover parts.