本文選題：筒形件　切入點：旋壓　出處：《浙江大學》2015年碩士論文

【摘要】：在高精度薄壁筒形件加工領域,旋壓加工技術作為一種特殊加工,由于其有著無屑加工、產品尺寸精度高、綜合性能好等優(yōu)勢,其受到的關注度越來越高,在很多國民經(jīng)濟的重要部門,比如航空航天、國防軍工、甚至家用器具等方面都占據(jù)著舉足輕重的地位。同時,筒形件強力旋壓屬于大變形的塑性成形過程,其成形機理復雜,并且成形質量受諸多工藝參數(shù)的影響。隨著現(xiàn)代旋壓筒形件的需求的日益增多,為了獲得更優(yōu)質的工件,如何優(yōu)化旋壓成形過程各個工藝參數(shù)已成為筒形件強力旋壓的重要研究點。本文的主要研究內容如下：指出了本課題的研究背景和意義。概述了旋壓技術的原理和特點,介紹了筒形件強力旋壓的主要問題,旋壓成形技術的分類、研究方法和研究內容,綜述了旋壓技術國內外的研究現(xiàn)狀,并引出了本文要研究的主要內容。筒形件強力旋壓模型的構建。分析了有限元計算的理論方法、旋壓過程的三個階段和三個變形區(qū)域,指明變形過程中的金屬塑性流動情況。利用ANSYS/LS-DYNA顯式動力學仿真平臺建模,改進建模方法,在建模過程中考慮旋輪摩擦產生的自轉和轉動慣量,旋輪加載方式為沿軸向移動而不再采用旋輪螺旋形進給方式,約束坯料起始端節(jié)點自由度,使其與實際情況中坯料起始端金屬塑性流動相符,最后驗證模型的有效性。提出筒形件強力旋壓成形質量綜合指標。揭示旋壓力變化趨勢與工件變形的關系。分別提取工件內外層單元三向應變隨旋壓過程的變化規(guī)律,說明應變類型及其變化規(guī)律與坯料材料變形情況的關系。分析壁厚沿軸線方向的分布,解釋工件壁厚與成形質量及缺陷產生的聯(lián)系。獲取不同旋輪參數(shù)對工件成形質量的影響,在此基礎上進行了工藝參數(shù)的研究及優(yōu)化。獲取不同形式旋輪適合的材料及各自對成形質量的優(yōu)缺點,選擇合適的旋輪對關鍵工藝參數(shù)進行研究。應用Taguchi正交設計方法研究了筒形件強力旋壓過程中進給率(F)、主軸轉速(S)以及旋輪成形角(α)關鍵參數(shù)對工件質量的影響,獲取最優(yōu)參數(shù)組合。最后對本文研究內容進行總結和展望。
[Abstract]:In the field of high-precision thin-walled cylindrical parts processing, spinning processing technology as a special processing, because of its non-chip processing, high dimensional accuracy, good comprehensive performance and other advantages, its attention is getting higher and higher. In many important sectors of the national economy, such as aerospace, national defense, military industry, and even household appliances, they all play a pivotal role. At the same time, the strong spinning of cylindrical parts belongs to the plastic forming process of large deformation, and its forming mechanism is complex. And the forming quality is affected by many technological parameters. With the increasing demand of modern spinning cylindrical parts, in order to obtain higher quality workpiece, How to optimize the process parameters of spinning process has become an important research point of the strong spinning of cylindrical parts. The main contents of this paper are as follows: the research background and significance of this subject are pointed out, and the principle and characteristics of spinning technology are summarized. This paper introduces the main problems, classification, research methods and contents of spinning technology for cylindrical parts, and summarizes the research status of spinning technology at home and abroad. The main contents of this paper, the construction of the force spinning model of cylindrical parts, the theoretical method of finite element calculation, the three stages of spinning process and the three deformation regions are also introduced. The plastic flow of metal in the process of deformation is pointed out. Using ANSYS/LS-DYNA explicit dynamic simulation platform, the modeling method is improved, and the rotation and moment of inertia produced by friction of rotary wheel are considered in the process of modeling. The loading mode of the rotary wheel is moving along the axial direction instead of adopting the spiral feed mode of the rotary wheel, which restricts the degree of freedom at the beginning end of the blank, and makes it accord with the metal plastic flow at the beginning end of the blank in the actual situation. Finally, the validity of the model is verified. The comprehensive quality index of the strong spinning forming for cylindrical parts is proposed. The relationship between the changing trend of the spinning pressure and the deformation of the workpiece is revealed. The variation law of the three-way strain of the inner and outer layer elements of the workpiece with the spinning process is extracted respectively. The relationship between the strain type and its variation law and the deformation of the blank is explained. The distribution of the wall thickness along the axis is analyzed, and the relation between the wall thickness of the workpiece and the forming quality and defects is explained. The influence of different rotary wheel parameters on the forming quality of the workpiece is obtained. On this basis, the process parameters are studied and optimized. The materials suitable for different forms of rotary wheel and their advantages and disadvantages for forming quality are obtained. Using Taguchi orthogonal design method, the influence of feed rate (FN), spindle rotation speed (S) and rotary wheel forming angle (偽) on the quality of workpiece is studied by means of Taguchi orthogonal design. The optimal parameter combination is obtained. Finally, the research content of this paper is summarized and prospected.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TG306

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本文編號：1653082