Research On Stamping Forming Process And Parameter Optimization Of Air Spring Reinforcing Plate For Vehicle Rear Door

In the context of economic globalization,the market competition in the automotive industry has become increasingly fierce,and consumers' diversified demands on the novelty,comfort and safety of automobile products have become increasingly complex.This has accelerated the upgrading and remodeling of automobile products.In the design and development of the whole vehicle,the forming quality of the body panel and the design of the mold structure directly affects the production,assembly and manufacturing cost of the automobile product.This paper took a certain type of vehicle rear door air spring reinforcement plate as the research object,used Auto Form software to carry out the numerical simulation of the whole process stamping forming,and optimized the stamping process according to the forming characteristics of the workpiece.And with the help of multi-objective optimization to achieved stamping quality control,then guided the completion of stamping molds designed,and finally through the production test to verify the feasibility of the forming scheme.This had certain practical value for improving the forming quality of parts and high production efficiency.The main research contents of this paper were as follows:(1)Built a three-dimensional solid model of the workpiece,analyzed its structural characteristics and stamping manufacturability,and established a simulation finite element model based on the completion of key process designed such as meshing,inverse calculation of sheet lines,and determination of stamping direction.Under the condition of initial parameters,the overall thickness changed and springback simulation of sheet metal under forming process and drawing process were compared and analyzed,and then the final stamping process scheme of the workpiece was determined.(2)The influence of blank holder force,friction coefficient and drawbead resistance coefficient on sheet metal thickness and workpiece springback was studied by single factor analysis method,and then the reasonable value range of each factor was determined.Select blank holder force,friction coefficient,drawbead resistance coefficient,stamping speed,convex and concave mold gap as independent variables,and designed 5 factors and 4 levels orthogonal test with the maximum springback and maximum thickening rate as the optimization indicators.Through range analysis and variance analysis,the influence of each process parameter on workpiece formability was further studied,and the single objective optimization parameter scheme was obtained at the same time.(3)Multi-objective optimization of workpiece forming was carried out by using grey relational theory,and on the basis of dimensionless processing,the correlation coefficient and degree of correlation between each group of parameter combinations to the optimization objective were calculated,so as to obtain a parameter schemed that took into account different optimization objectives.By comparing the single-objective optimization results,the comprehensive forming quality of the workpiece was the best at this time.Based on multi-objective optimization,the simulation of workpiece springback under drawing process and reshaping process was analyzed,and a complete set of stamping molds was designed and completed on this basis.Through trial mold production,the measured values of stamping parts were basically consistent with the simulated values,and the forming quality met the production standard,which verifies that the multi-objective optimization was effective and the mold design structure was reasonable.