【摘要】：模具設計的速度與精度直接決定著汽車開發(fā)周期和質(zhì)量�；诎辶铣尚蜟AE分析的汽車覆蓋件模具結構設計方法已廣泛應用于汽車覆蓋件模具制造廠商，可以在一定程度上提高產(chǎn)品的更新速度。面對復雜多變的市場環(huán)境和車身覆蓋件的頻繁更新，如何縮短工藝規(guī)劃、模具結構設計與產(chǎn)品試制到最終的批量生產(chǎn)的時間決定著產(chǎn)品市場競爭力與企業(yè)的核心競爭力，是企業(yè)越來越看重的問題。 在板料成形CAE分析過程中，尤其是對回彈問題的分析過程中，摩擦力、壓邊力、拉延筋尺寸等參數(shù)的相互影響與制約增加了工藝規(guī)劃的難度。所以，組合參數(shù)的選取對研究回彈問題有著重要意義。本文介紹了板料成形有限元分析和汽車板成形技術的研究背景，在研究覆蓋件產(chǎn)品工藝規(guī)劃和拉延模具結構設計方法的基礎上，結合某車型頂蓋后橫梁，提出了基于組合參數(shù)優(yōu)化的汽車板精益成形分析和使用同步建�？焖僭O計拉延模具結構的理念，主要包括以下幾方面內(nèi)容： 闡述了汽車板成形仿真理論的關鍵技術，包括物理關系（本構理論）、有限元求解過程算法、單元模型和接觸搜索與摩擦處理這四部分核心內(nèi)容，，并借助AutoForm一步逆成形模塊完成了成形預評估和毛坯尺寸的初步確定。并歸納了模面造型設計的流程，進行了汽車頂蓋后橫梁的沖壓工藝初步設計和仿真前處理的設置。 使用AutoForm軟件對頂蓋后橫梁產(chǎn)品進行全工序成形分析。通過正交試驗研究了摩擦因子、拉延筋、壓邊力和模具間隙等成形參數(shù)的組合對產(chǎn)品回彈數(shù)值和減薄率的影響。使用方差分析法得出上述因素對成形質(zhì)量影響的程度，選出最佳優(yōu)化工藝組合，在此基礎上設計出綜合沖壓工序圖。 歸納總結了頂蓋橫梁類拉延模具結構特點，結合汽車頂蓋后橫梁綜合沖壓工藝圖，借助三維造型軟件，設計出汽車頂蓋后橫梁的拉延模具，系統(tǒng)闡述了該拉延件產(chǎn)品的完整設計流程，并詳細介紹了模具結構校核的要點。
[Abstract]:The speed and precision of die design directly determine the development cycle and quality of automobile. The design method of automobile panel die structure based on sheet metal forming CAE analysis has been widely used in automobile panel die manufacturers, which can improve the renewal speed of products to a certain extent. Faced with the complex and changeable market environment and the frequent renewal of body panels, how to shorten the process planning, the time between die structure design and product trial production to the final batch production determines the market competitiveness of products and the core competitiveness of enterprises. It is an increasingly important issue for enterprises. In the process of CAE analysis of sheet metal forming, especially in the analysis of springback problem, the mutual influence and restriction of friction force, blank holder force and drawing bar size increase the difficulty of process planning. Therefore, the selection of combination parameters is of great significance to the study of springback problem. This paper introduces the finite element analysis of sheet metal forming and the research background of automobile sheet forming technology. On the basis of studying the process planning of panel products and the design method of drawing die structure, combined with the rear crossbeam of the top cover of a certain vehicle model, the paper introduces the research background of sheet metal forming finite element analysis and automobile sheet forming technology. The concept of lean forming analysis based on combination parameter optimization and rapid design of drawing die structure using synchronous modeling are put forward. The main contents are as follows: the key technology of automobile sheet forming simulation theory is expounded. It includes four core parts: physical relation (constitutive theory), finite element algorithm, element model and contact search and friction treatment. The pre-evaluation and the initial determination of blank size are completed with the help of AutoForm one-step inverse forming module. The process of die surface modeling design is summarized, and the preliminary design of stamping technology and the setting of simulation pre-processing are carried out. The AutoForm software is used to analyze the whole process of the cross beam product behind the top cover. The effects of friction factor, drawing bar, blank holder force and die clearance on the springback and thinning rate of the product were studied by orthogonal test. The degree of influence of the above factors on the forming quality was obtained by using variance analysis method, and the optimum process combination was selected, and the comprehensive stamping process diagram was designed on this basis. This paper summarizes the structural characteristics of the drawing die of the roof beam, combined with the comprehensive stamping process diagram of the rear cross beam of the top cover of the automobile, and with the aid of 3D modeling software, designs the drawing die for the rear beam of the top cover of the automobile. The complete design flow of the drawing part is systematically expounded, and the main points of die structure checking are introduced in detail.
【學位授予單位】：沈陽工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TG385

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