本文選題：薄壁管 + 內(nèi)增量��； 參考：《西安理工大學(xué)》2017年碩士論文

【摘要】：在航空航天、石油化工及民用工業(yè)領(lǐng)域,存在大量不同形式的管材及不同類(lèi)型的內(nèi)表面,如何實(shí)現(xiàn)這些內(nèi)表面高效、高精度成形是一個(gè)重要的工程問(wèn)題。薄壁管材內(nèi)增量成形工藝是通過(guò)成形工具對(duì)薄壁管進(jìn)行擠壓和碾壓迫使金屬產(chǎn)生流動(dòng),從而形成目標(biāo)制件的一種新型管材柔性成形技術(shù)。。該技術(shù)采用簡(jiǎn)單的設(shè)備和成形工具即可實(shí)現(xiàn)對(duì)復(fù)雜薄壁管件的連續(xù)塑性成形,具有柔性好、成本低、綠色節(jié)能等優(yōu)點(diǎn)。本文研究薄壁管材內(nèi)增量成形力,為該技術(shù)在工程上的應(yīng)用提供指導(dǎo)。分析了薄壁管材內(nèi)增量成形原理和成形過(guò)程運(yùn)動(dòng)關(guān)系,給出了成形工具自轉(zhuǎn)轉(zhuǎn)速與主軸轉(zhuǎn)速之間的數(shù)學(xué)表達(dá)式。依據(jù)薄壁管材內(nèi)增量成形原理,應(yīng)用主應(yīng)力法對(duì)薄壁管材變形區(qū)的材料切取基元體,建立了基元體的應(yīng)力平衡微分方程和邊界條件,獲得了變形區(qū)材料的成形力解析表達(dá)式,為該技術(shù)成形設(shè)備的選擇和工藝參數(shù)的優(yōu)化提供理論依據(jù)。建立了紫銅薄壁管材內(nèi)增量成形有限元分析模型,應(yīng)用ABAQUS分析軟件獲得了成形過(guò)程的等效應(yīng)力、應(yīng)變和管壁厚度的分布規(guī)律,研究了徑向進(jìn)給量、成形工具圓角半徑、起始成形距離和管壁厚度對(duì)成形力的影響,獲得了不同工藝參數(shù)對(duì)成形力的影響規(guī)律。建立了薄壁管材內(nèi)增量成形實(shí)驗(yàn)系統(tǒng),進(jìn)行了不同工藝條件下紫銅薄壁管材內(nèi)增量實(shí)驗(yàn),通過(guò)正交實(shí)驗(yàn)分析了不同工藝參數(shù)對(duì)成形力的影響,建立了紫銅薄壁管材內(nèi)增量成形力的經(jīng)驗(yàn)公式,驗(yàn)證了理論解析和仿真分析的正確性。
[Abstract]:In Aeronautics and Astronautics, in the field of petrochemical and civil industry, there are a large number of different types of tubes and different types of inner surfaces. How to achieve high efficiency and high precision forming of these inner surfaces is an important engineering problem. The incremental forming process in thin-walled tubes is to press and crush the thin tubes to force the metal flow through the forming tool. A new flexible tube forming technology for forming the object parts. This technology can realize continuous plastic forming of complex thin-walled tubes with simple equipment and forming tools. It has the advantages of good flexibility, low cost and green energy saving. This paper studies the internal increment forming force of thin-walled tube, and provides the application of this technology in engineering. The principle of incremental forming and the relation between the forming process and the forming process are analyzed. The mathematical expression between the rotation speed of the forming tool and the spindle speed is given. According to the principle of incremental forming in the thin-walled tube, the principal stress method is used to cut the material of the deformation zone of the thin-walled tube, and the stress balance differential of the basic element body is established. The analytic expression of the forming force of the deformation zone material is obtained. The theoretical basis for the selection of the forming equipment and the optimization of the technological parameters is provided. The finite element analysis model of the incremental forming in the thin-walled copper tube is established. The equivalent stress, strain and the thickness of the tube wall are obtained by using the ABAQUS analysis software. The influence of the radial feed, the radius of the forming tool, the initial forming distance and the thickness of the tube wall on the forming force are studied. The influence of the different process parameters on the forming force is obtained. An experimental system of incremental forming in the thin-walled tube is established. The effect of different process parameters on the formability is analyzed. The empirical formula of incremental forming force in the thin-walled copper tube is established, and the correctness of theoretical analysis and simulation analysis is verified.

【學(xué)位授予單位】：西安理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TG306

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