【摘要】：本文探討了大尺度曲面板材成形的一種新的漸進(jìn)折彎的整體冷成形加工方法。相對于傳統(tǒng)的水火彎板成形,提高了生產(chǎn)效率,并且可以改善工人的工作環(huán)境,提高工藝的合理性與經(jīng)濟性。首先通過拉伸實驗測定高強度金屬板WELDOX900的彈塑性材料力學(xué)參數(shù)并導(dǎo)入到有限元分析軟件之中。利用ABAQUS里固有的本構(gòu)模型和單元,構(gòu)建大幅面鋼板漸進(jìn)雙曲折彎成形的三維彈塑性有限元模型。通過有限元數(shù)值模擬對比漸進(jìn)折彎中的關(guān)鍵因素,包括凹凸模半徑、凹模開口、凸模進(jìn)給量對折彎以及回彈的影響,在此基礎(chǔ)上優(yōu)化了凸凹模漸進(jìn)折彎大尺度曲面板材的成形工藝參數(shù)。本文通過理論推導(dǎo)和有限元模擬分析,確定了凸凹模半徑及工件成形的幾何規(guī)劃。并通過有限元模擬取得了較好的成形效果,最后通過實驗驗證了模擬以及工藝規(guī)劃的有效性及可行性。對于模擬中碰到的起皺缺陷問題,進(jìn)行了理論上的分析探討和模擬研究,并且通過改變關(guān)鍵工藝參數(shù)消除了起皺的缺陷,對于加工過程具有實際指導(dǎo)意義。通過有限元模擬大尺度等曲率鞍形面和帆形面板料成形的折彎過程,得出的折彎規(guī)律,有助于今后進(jìn)一步研究復(fù)雜曲面的成形過程。
[Abstract]:In this paper, a new cold forming method of progressive bending for large scale curved sheet metal forming is discussed. Compared with the traditional water and fire bending plate forming, the production efficiency is improved, and the working environment of workers is improved, and the rationality and economy of the process are improved. The elastoplastic material mechanical parameters of high strength metal plate WELDOX900 were measured by tensile test and introduced into the finite element analysis software. Based on the inherent constitutive model and element in ABAQUS, a three-dimensional elastic-plastic finite element model for the progressive hyperbolic bending of large-format steel plate is constructed. Through the finite element numerical simulation, the key factors in progressive bending are compared, including the radius of the die, the opening of the die, the effect of the feed of the die on the bending and the springback. On this basis, the forming process parameters of progressive bending of large scale curved sheet with convex and concave die are optimized. In this paper, the radius of convex and concave die and the geometric programming of workpiece forming are determined by theoretical derivation and finite element simulation analysis. Good forming effect is obtained by finite element simulation. Finally, the effectiveness and feasibility of simulation and process planning are verified by experiments. The wrinkling defects encountered in the simulation are analyzed and simulated theoretically, and the wrinkling defects are eliminated by changing the key process parameters, which is of practical significance for the machining process. The bending process of large scale equal-curvature saddle surface and sails is simulated by finite element method, and the bending law is obtained, which is helpful to further study the forming process of complex surface in the future.
【學(xué)位授予單位】：上海應(yīng)用技術(shù)學(xué)院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG306

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本文編號：2251163