本文選題：無(wú)芯模旋壓 + 分段成形�。� 參考：《浙江大學(xué)》2017年碩士論文

【摘要】：旋壓技術(shù)作為塑性成形加工工藝的一種,廣泛應(yīng)用于復(fù)雜曲面件高精度、輕量、高穩(wěn)定性的制造加工。目前應(yīng)用較為廣泛的是普通旋壓技術(shù),以有芯模為主,但是復(fù)雜曲面件芯模的加工制造成本較貴、周期較長(zhǎng),無(wú)芯模旋壓作為一種無(wú)模連續(xù)局部金屬塑性成形技術(shù),體現(xiàn)了很多優(yōu)勢(shì),研究表明偏移式分段成形方式可以有效控制旋壓件的減薄率,但是此方式在多道次無(wú)芯模旋壓中較少使用,本文將此成形方式應(yīng)用于無(wú)芯模旋壓,探討其對(duì)無(wú)芯模旋壓成形精度的影響。具體的研究?jī)?nèi)容包括:指出了本文的研究背景,概述了有芯模旋壓以及無(wú)芯模旋壓成形方式與軌跡形狀的研究現(xiàn)狀,提出了無(wú)芯模旋壓不同成形精度問(wèn)題以及成形方式優(yōu)化問(wèn)題,并引出本文有關(guān)無(wú)芯模旋壓成形方式研究及其優(yōu)化的主要內(nèi)容。構(gòu)建了多道次無(wú)芯模旋壓不同成形方式的幾何模型及仿真模型。鑒于普旋多道次已經(jīng)得出的結(jié)論,本文分段成形的正返程曲線均使用對(duì)壁厚保持較佳的漸開(kāi)線軌跡。在此基礎(chǔ)上推導(dǎo)了漸開(kāi)線的生成方程,并詳細(xì)介紹了分段軌跡的確定方法,設(shè)計(jì)了不同目標(biāo)曲線的分段成形軌跡。構(gòu)建了偏轉(zhuǎn)式漸進(jìn)成形方式幾何模型和偏移式分段成形方式幾何模型。利用ANSYS/LS-DYNA顯示動(dòng)力學(xué)仿真平臺(tái)構(gòu)建了不同成形方式的有限元仿真模型,并進(jìn)行了模型的有效性驗(yàn)證。實(shí)驗(yàn)探討了不同目標(biāo)輪廓曲線不同成形方式的成形精度。本文所用的實(shí)驗(yàn)平臺(tái)是項(xiàng)目組自主設(shè)計(jì)的多功能復(fù)合式板料旋壓機(jī),在設(shè)備以及實(shí)驗(yàn)條件準(zhǔn)備充分的基礎(chǔ)上,詳細(xì)設(shè)計(jì)了實(shí)驗(yàn)方案并進(jìn)行了旋壓實(shí)驗(yàn),利用超聲波測(cè)厚儀和輪廓測(cè)量?jī)x對(duì)成形件的壁厚和形狀輪廓進(jìn)行了測(cè)量,對(duì)結(jié)果進(jìn)行了分析,并得出了針對(duì)不同目標(biāo)輪廓曲線最佳的成形方式。進(jìn)行了針對(duì)復(fù)雜目標(biāo)曲線的無(wú)芯模旋壓漸進(jìn)分段成形方式的研究。對(duì)三種漸進(jìn)分段成形方式進(jìn)行了軌跡設(shè)計(jì),針對(duì)目標(biāo)凸凹凸以及凹凸凹曲線進(jìn)行了實(shí)驗(yàn)方案設(shè)計(jì)并實(shí)驗(yàn)驗(yàn)證,得出了對(duì)壁厚效果和形狀效果保持最優(yōu)的漸進(jìn)分段成形方式。進(jìn)行了成形方式優(yōu)化和基于進(jìn)給比優(yōu)化的成形質(zhì)量改善研究。為了改善表面質(zhì)量,提高成形精度,分別進(jìn)行了基于終道次漸進(jìn)與前道次漸進(jìn)分段組合成形方式,以及基于漸進(jìn)分段與漸進(jìn)成形混合成形方式的優(yōu)化研究。并通過(guò)不同恒定進(jìn)給比、道次間變化進(jìn)給、道次內(nèi)變化進(jìn)給的成形質(zhì)量研究,進(jìn)一步借助于變進(jìn)給比優(yōu)化方式,提高了成形精度。
[Abstract]:As a kind of plastic forming technology, spinning technology is widely used in the manufacture of complex curved surface parts with high precision, light weight and high stability. At present, the common spinning technology is widely used, with the core die as the main part, but the manufacturing cost of the core die of the complex curved surface is more expensive and the cycle is longer. The coreless die spinning is a kind of continuous local metal plastic forming technology without die. The research shows that the offset piecewise forming method can effectively control the thinning rate of spinning parts, but this method is seldom used in multi-pass coreless die spinning. In this paper, this forming method is applied to coreless die spinning. The effect of this method on the forming accuracy of coreless die spinning is discussed. The specific research contents are as follows: the research background of this paper is pointed out, and the research status of the core die spinning, the coreless die spinning mode and the trajectory shape are summarized. The problems of different forming precision and forming mode optimization of coreless die spinning are put forward, and the main contents of this paper about the research and optimization of coreless die spinning are introduced. The geometric model and simulation model of multi-pass coreless die spinning with different forming methods are constructed. In view of the previous conclusions, the positive return curves in this paper all use involute trajectories with good wall thickness. On this basis, the generating equation of involute is derived, the method of determining segmental trajectory is introduced in detail, and the piecewise forming trajectory of different target curves is designed. The geometric models of deflection progressive forming and offset piecewise forming are constructed. The finite element simulation models of different forming modes are constructed by using ANSYS- LS-DYNA display dynamics simulation platform, and the validity of the model is verified. The forming accuracy of different object profile curves and different forming methods was investigated experimentally. The experimental platform used in this paper is a multifunctional compound sheet spinning machine designed by the project team. On the basis of sufficient preparation of the equipment and experimental conditions, the experimental scheme is designed in detail and the spinning experiment is carried out. The wall thickness and shape profile of forming parts were measured by ultrasonic thickness measuring instrument and contour measuring instrument. The results were analyzed and the best forming method for different target contour curves was obtained. The method of coreless die spinning step-by-step forming for complex target curve was studied. In this paper, three progressive piecewise forming methods are designed, and the experimental schemes are designed and verified for the convex and concave curves of the target. The optimum incremental piecewise forming method for the wall thickness effect and shape effect is obtained. The optimization of forming mode and the improvement of forming quality based on feed ratio optimization were carried out. In order to improve the surface quality and improve the forming accuracy, the optimization research was carried out based on the end-pass progressive and the previous progressive piecewise combination forming, and the hybrid incremental and incremental forming. Through the research on the forming quality of different constant feed ratio, variable feed between passes, and variable feed within the pass, the forming accuracy is improved by means of the optimization of variable feed ratio.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG306

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