三通管液壓成形技術(shù)有限元模擬及工藝分析

1、三通管液壓成形技術(shù)有限元模擬及工藝分析-論文標(biāo)題:三通管液壓成形技術(shù)有限元模擬及工藝分析Finite Element Simulation and Technique Analysis of Tube Hydroforming Process論文作者 李樂(lè)論文導(dǎo)師 周杰,論文學(xué)位 碩士,論文專業(yè) 材料加工工程論文單位 重慶大學(xué),點(diǎn)擊次數(shù) 44,論文頁(yè)數(shù) 68頁(yè)File Size4673kT-shaped Tube; Hydroforming; FEM Simulation; Technology Analysis傳統(tǒng)的塑性加工制造工藝普遍采用鑄、鍛、焊等工藝技術(shù)進(jìn)行空心零件生產(chǎn)，從七十年代開(kāi)始

2、出現(xiàn)了利用管坯塑性成形空心零件的技術(shù)。其中利用液壓成形技術(shù)生產(chǎn)空心零件是目前較為先進(jìn)的生產(chǎn)方法，該方法主要是利用專門的液壓系統(tǒng)產(chǎn)生高達(dá)數(shù)百甚至上千MPa的成形壓力最終使零件成形。由于液壓成形方法的成形壓力場(chǎng)分布均勻穩(wěn)定，成形產(chǎn)品質(zhì)量好，在冷成形中應(yīng)用范圍廣，已成為塑性加工領(lǐng)域研究的前沿和熱點(diǎn)，并在美、德、日、俄等國(guó)的科研機(jī)構(gòu)和大型企業(yè)中得到了廣泛應(yīng)用。 三通管液壓成形技術(shù)是該項(xiàng)技術(shù)中應(yīng)用較為廣泛的部分，同時(shí)也是一個(gè)難點(diǎn)。由于其成形過(guò)程中金屬的變形行為非常復(fù)雜，理論分析困難，因此國(guó)內(nèi)對(duì)于此問(wèn)題的研究較少。本文針對(duì)目前科研和生產(chǎn)中的問(wèn)題，使用有限元模擬仿真軟件DYNAFORM結(jié)合液壓技術(shù)對(duì)三通管液

3、壓成形過(guò)程及工藝實(shí)施進(jìn)行了研究。 本論文在綜合查閱消化吸收大量國(guó)內(nèi)外技術(shù)資料的基礎(chǔ)上，對(duì)三通管液壓成形方法進(jìn)行了研究。首先分析研究三通管液壓成形過(guò)程，比較該項(xiàng)工藝與傳統(tǒng)成形工藝的不同特點(diǎn)，指出了影響三通管液壓成形過(guò)程的主要因素，并研究了材料和管坯的成形性能對(duì)液壓成形工藝的影響。其次，簡(jiǎn)要介紹了計(jì)算機(jī)仿真技術(shù)所依賴的有限元理論基礎(chǔ)，并對(duì)板料成形專用有限元模擬仿真軟件DYNAFORM的應(yīng)用特點(diǎn)及功能做了總結(jié)和分析。然后，運(yùn)用模擬仿真軟件DYNAFORM分別分析了內(nèi)壓力、擠壓力和平衡力對(duì)三通管成形的作用，明確了它們間的加載關(guān)系，并得出了最佳加載路徑。之后，分析了凹模過(guò)渡區(qū)圓角半徑，摩擦系數(shù)，管坯材料

4、以及管坯長(zhǎng)徑比等工藝參數(shù)對(duì)成形結(jié)果的影響，并得到了這些因素對(duì)三通管液壓成形結(jié)果的基本影響規(guī)律。最后，通過(guò)對(duì)內(nèi)高壓液壓技術(shù)的探討，提出了產(chǎn)生內(nèi)高壓液壓源的幾種基本方法，針對(duì)三通管液壓成形工藝的要求和特點(diǎn)，設(shè)計(jì)了成形模具裝置和液壓控制系統(tǒng)，并對(duì)液壓技術(shù)實(shí)施中的密閉、介質(zhì)、管接頭以及潤(rùn)滑等工藝問(wèn)題提出了基本解決方案。 本文對(duì)三通管液壓成形技術(shù)的分析方法和得出的結(jié)論能夠滿足生產(chǎn)應(yīng)用的基本要求，對(duì)于今后該項(xiàng)技術(shù)的進(jìn)一步研究及推廣應(yīng)用將具有較為普遍的指導(dǎo)和參考意義。Generally the hollow parts have been producted by casting, forging and

5、welding in conventional plastic working and manufacturing engineering. From 70s, a new technology-the tube blank plastic forming, has emerged. Thereinto, the tube hydroforming is an advanced production method. Tube hydroforming is using special hydraulic to produce hundreds and even thousands MPa fo

6、rming pressure to make the parts forming. Because it"s forming pressure field distributes uniformity stabilization, the quality of product is high and the application field in cold forming is very wide, so this technology has been the new front and hot point in plastic working research, and so

7、on, it has been extensively used in scientific institutions and large enterprise in America, Germany, Japan and Russia.T-shaped tube hydroforming is applied abroad but it is a difficulty inthe tube hydroforming. Due to the excessively-large strain of the very complicated forming process, its analysi

8、s in theory is very difficult and the study about it is not popular in domestic. Aiming at the urgent needs of research and manufacture, this paper investigates the forming process and process engineering of T-shaped tube hydroforming with finite element simulation (FEM) software DYNAFORM and hydrau

9、lic.On the base of synthesis consult and digest absorb a great deal of overseas and domestic literature information, investigate the forming process of T-shaped tube hydroforming. First, analyse the hydroforming process and the forming rule, compare this method and the traditional technique, indicat

10、e the influences of the hydroforming process, and investigate the material and tube blank forming capability. Then, simply introduce the finite element theory foundation of computer simulation technology, analyse and sum up the application trait and function of the sheet forming simulation software-

11、DYNAFORM. Thirdly, by using the dynamic explicit finite element simulation software - DYNAFORM, analyse internal pressure, extrusion pressure and balance pressure , point out their loading relationship, and elicit optimal loading curve. Afterwards, analyse the radius , friction coefficient, material

12、s and the fineness-ratio of main duct, and elicit their infection disciplinarian curve. Lastly, discuss hyperpressure hydraulic, and present production ways of hydraulic pressure fountain. Aiming at the characteristic and request of T-shaped tube hydroforming, design the forming die andthe hydraulic control system. Present the solution project of the hermetic closure, pressure medium, pipe coupling and lubrication of the hydraulic.The anal