Robustness Design And Die Profile Compensation For Automotive Panel Stamping And Their Applications

In recent years,the automobile industry has boomed,and people's requirements for automobiles have become higher and higher.The quality and performance of the car directly determine its position in the market.Automobile cover is one of the main parts of a car,and its design level and quality are the core factors that reflect market competitiveness.Therefore,the manufacturing process of automobile cover parts is an important part of automobile production,and cost reduction and cycle reduction can be realized in the manufacturing process.Automobile cover parts are characterized by complex shapes,large sizes,small thicknesses,and high forming quality.In the process of stamping,the deformation is very complicated,and the stress and strain distribution of the blank is uneven.The forming process of parts requires multiple procedures,which has high standards and strict requirements for the design of the process.Therefore,how to improve the quality of stamping and forming of automobile panels has become the focus of people's research.This paper studies the robust design of automotive panel stamping and the compensation of the mold surface,and applies it to the forming process of 3201001-E12 front fender.The main content of the paper is as follows:The first chapter summarizes the current situation of the robust design of sheet metal stamping forming and the technology of springback surface compensation.The research significance and technical background of the topics described in the paper are briefly explained.From the numerical simulation technology of sheet metal forming,A review of the current status of domestic and foreign research in the aspects of robust optimization design of sheet metal stamping forming and spring surface compensation technology for sheet metal stamping forming.frame.The second chapter analyzes in detail the stamping mechanism of automobile panel.This method analyzes the process of sheet metal stamping,the process of contact between sheet metal and mold,and the process of sheet springback.The effect of process parameters on the forming performance of formed parts is studied by means of numerical simulation techniques.Grey correlation analysis is used.The method selects the key factors of stamping forming,and provides a theoretical basis for the key factors in the robust design of stamping and forming of automobile panels in Chapter 3.The third chapter proposes a robust design method for stamping and forming of automobile panels.This method first selects wrinkles and ruptures as design goals and constraint functions,and uses gray correlation analysis to select critical noise factors and critical process parameters(as known in Chapter 2).During the solution process,interpolation is based on residuals and radial basis interpolation.The response surface model is improved,the accuracy of the response surface is improved,and the corresponding accuracy check is performed.The improved response surface approximation model is established through the optimal Latin hypercube test.The co-evolution algorithm and the clone selection operator algorithm are used to compare Combined with solving,the original problem is transformed into multiple simple problems by decomposing the search space,which reduces the time complexity,especially when some variables have a non-linear relationship,the performance is superior.Finally,a 6? robust design is performed for the deterministic optimization solution.The method is applied to the robust optimization design of a certain automobile cover,and the validity of the method is verified.The fourth chapter puts forward the compensation method of the stamping mold surface of the automobile panel.This method is based on the nodal displacement inverse compensation method in the process of spring profile compensation.There is still the problem of deviation.The Rodriguez rotation formula of three-dimensional space is selected to solve the node coordinates.Similar assumptions simplify the solution of the compensation path.The compensation profile is constructed based on the solved compensation path,and the compensation coefficient is introduced to make the compensation profile constructed more accurately.The method is applied to the mold surface compensation of a certain automobile cover,and the validity of the method is verified.The fifth chapter combined with the "robust design of automotive panel stamping and robust design and mold surface compensation" project jointly developed by Zhejiang University and Huzhou Machine Tool Works,a set of automotive panel stamping process design system was developed,and the theoretical methods in this article were systematically The theory and system of this paper were applied to the stamping process of 3201001-E12 front fender,which realized the practical application of theory and system.The sixth chapter summarizes the research results of this article,and looks forward to the future development of related research directions.