圓錐形件拉深成形側(cè)壁起皺預(yù)測(cè)
[Abstract]:Conical part is the most typical surface drawing part. In the deep drawing process, the side wall material is in the state of suspension, which is prone to wrinkle. Side wall wrinkling seriously affects the use and appearance of forming parts, and may even damage the mold. Therefore, it is of great significance to study the forming mechanism of side wall wrinkling and analyze the influence of material parameters and process parameters on side wall wrinkle, which is of great significance to the prevention of side wall wrinkling. Firstly, the forming characteristics of conical parts are analyzed. During the deformation process, the forming blank is divided into five regions: conical bottom area, punch fillet area, hanging side wall area of die clearance, concave die fillet area and flange area. By using the principal stress method, the stress formulas of the suspended side wall and flange are derived, and the stress distribution law of the suspended side wall and flange is discussed. The possible location of side wall wrinkling is given near the radius of the die fillet. Based on the ABAQUS/Explicit module, the deep drawing process of conical parts is numerically simulated. Some key techniques, such as element selection, material shape, mesh division, contact and friction treatment, load application and boundary conditions, are presented. The results of numerical simulation are in good agreement with the theoretical analysis, and the method of numerical simulation is proved to be correct. The theory of cone side wall wrinkling is established by means of energy method and increment theory, and the critical expression of hanging side wall wrinkle is obtained. A new deflection function satisfying the boundary conditions is proposed. Through the combination of Matlab program and ABAQUS finite element simulation, the side wall wrinkle prediction is realized. The deflection function, yield criterion, blank material parameters (elastic modulus, Poisson ratio, hardening coefficient, strain intensity coefficient, thickness anisotropy coefficient and sheet thickness, etc.) and drawing process parameters (blank holder force, die fillet radius, etc.) are predicted. Effects of die clearance, friction factor and other factors on side wall wrinkle of conical parts. This study provides a good reference value for the prevention of side wall wrinkle in the drawing process of cone-shaped parts.
【學(xué)位授予單位】:湘潭大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類(lèi)號(hào)】:TG386.32
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