【正文】 洛陽理工學(xué)院畢業(yè)設(shè)計(jì)（論文） I 車削加工鈦合金過程的有限元模擬 摘 要 改革開放以來，由于生產(chǎn)技術(shù)的不斷提高，各種材料得到了充分利用，特別是鈦合金的開發(fā)利用， 正越來越多的應(yīng)用在生產(chǎn)生活的各個(gè)方面。但由于其特殊的材料性能使其加工效率比較低下，加工成本較大。因此研究鈦合金的切削性能，提高加工效率具有重要的意義。 本文對(duì)鈦合金的切削性能進(jìn)行了研究。金屬切削過程是一個(gè)十分復(fù)雜的過程，切削工藝主要是通過刀具在材料表面切除多余的材料層來獲得理想的工件形狀、尺寸以及表面光潔度的機(jī)械加工方法。 切削過程的建模和仿真在改進(jìn)切削刀具的設(shè)計(jì)和優(yōu)化切削參數(shù)方面有很大的發(fā)展?jié)摿?。有限元法逐漸成為切削過程的研究和仿真的一種有效手段。本文的目的之一就是建立一個(gè)切削過程仿真的有限元模型，預(yù)報(bào)切削力和切削溫度。在預(yù)先收集工件流動(dòng)應(yīng)力數(shù)據(jù)和在高應(yīng)變率和高溫下的摩擦系數(shù)的基礎(chǔ)上，利用有限元軟件 DEFORM3D 仿真切削過程。分析了切削過程中切削溫度 的變化規(guī)律。 關(guān)鍵詞： 車削，鈦合金，有限元， DEFROM3D 洛陽理工學(xué)院畢業(yè)設(shè)計(jì)（論文） II Finite Element Simulation of Turning Titanium Alloy Process ABSTRACT Since the reform and opening, due to production technology unceasing enhancement, All kinds of materials especially the most use of exploitation and utilization of titanium alloy, got fully used, and is increasingly being used in the production of all aspects of life． However， because of its unique material properties， we can not get better processing efficiency and lower processing costs. Therefore， it’s of great significance to study machinability of titanium alloys for improve the processing efficiency． In this paper, the cutting performance of the titanium have been researching. Metalcutting process is a very plex process. Turning operations are performed to modify shape, dimension, and surface roughness of a workpiece cutting away from it several layers of material. Modeling and simulation of cutting processes have the potential for improving tool designs and selecting optimum conditions． Finite element method is being one of method to research and simulate the curing processes． The one objective of this study was to develop a FEM model for simulating the cutting process in turning and predict curing forces and temperatures using finite element analysis． On the basis of predata collection of the workpiece flow stress and high strain rate and high temperature friction coefficient, Simulation of cutting process is set up by using of finite element software DEFORM3D. Analyze the cutting temperature changes of the cutting process. KEY WORDS: Turning , Titanium Alloy, Finite element, DEFROM3D 洛陽理工學(xué)院畢業(yè)設(shè)計(jì)（論文） III 目 錄 前 言 ....................................................................................................... 1 第 1 章 鈦合金的性能及應(yīng)用 ............................................................... 4 鈦合金的化學(xué)性能 ................................................................ 4 鈦合金的切削特點(diǎn) .................................................................... 6 鈦合金的應(yīng)用現(xiàn)狀 .................................................................... 7 第 2 章 車削鈦合金實(shí)驗(yàn)結(jié)果分析 ....................................................... 9 實(shí)驗(yàn)相關(guān)材料 ............................................................................ 9 工件材料 .......................................................................... 9 刀具材料 .......................................................................... 9 實(shí)驗(yàn)方案 .................................................................................... 9 實(shí)驗(yàn)結(jié)果及分析 ...................................................................... 10 實(shí)驗(yàn)結(jié)果 ..........................................................................11 結(jié)果分析 ........................................................................ 12 第 3 章 鈦合金車削有限元仿真 ......................................................... 15 有限元分析方法過程 ............................................................. 15 有限元軟件 DEFORM3D 介紹 ............................................. 15 DEFORM3D 中應(yīng)用加工向?qū)K進(jìn)行車削仿真的基本步驟 .................................................................................................. 17 DEFORM3D 中切削加工過程有限元模 型建立的主要注意點(diǎn) .................................................................................................. 18 網(wǎng)格劃分的設(shè)置 ........................................................... 18 切屑的分離標(biāo)準(zhǔn)設(shè)定 ................................................... 19 材料模型的建 立 ........................................................... 20 速度邊界條件的確定 ................................................... 20 時(shí)間步長的確定 ........................................................... 20 第 4 章 仿真分析 .................................................................................. 22 概述 .......................................................................................... 22 不同切削條件下的切削力仿真 ............................................. 22 洛陽理工學(xué)院畢業(yè)設(shè)計(jì)（論文） IV 不同切削條件下的切削溫度仿真 ......................................... 25 切削力的仿真結(jié)果與實(shí)驗(yàn)結(jié)果的對(duì)比 ................................. 27 第 5 章 車床主軸 箱及夾具設(shè)計(jì) ......................................................... 29 車床主軸箱的設(shè)計(jì) .................................................................. 29 確定極限轉(zhuǎn)速 ................................................................ 29 確定公比 ......................................................................... 29 求出主軸轉(zhuǎn)速級(jí)數(shù) ........................................................ 29 確定結(jié)構(gòu)網(wǎng)和結(jié)構(gòu)式 .................................................... 29 繪制轉(zhuǎn)速圖 ..................................................................... 31 確定公比齒輪齒數(shù)的確定 ............................................ 33 傳動(dòng)系統(tǒng)圖的擬定 ........................................................ 34 夾具設(shè)計(jì) .................................................................................. 35 零件分析 ........................................................................ 35 定位基準(zhǔn)的選擇 ........................................................... 36 切削力和夾緊力的計(jì)算 ................................................ 36 定位誤差分析 ................................................................ 37 結(jié) 論 ..................................................................................................... 38 謝 辭 ....................................................................................................... 39 參考文獻(xiàn) ...................................