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研究生： 林欽宏
Qin-Hong Lin
論文名稱： 三維面對稱擠製加工問題之有限元素分析
指導教授： 葉維磬
WEI-CHING YEH
口試委員:
學位類別： 碩士
Master
系所名稱： 工學院 - 機械工程學系
Department of Mechanical Engineering
畢業學年度： 89
語文別： 中文
論文頁數： 88
中文關鍵詞： 擠製 、有限元素 、面對稱
相關次數： 點閱：6  下載：0 
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    • 本文於模擬擠製過程中，藉由改變胚料導角及摩擦因子等參數，以探討加工參數改變時，對擠製變形行為及成形所需之擠製力的影響。結果顯示各理論計值在定性上均與實驗有一致的結果，但定量上則與實驗有明顯差異。若以各理論比較時，有限元素解能較VUB及UB解對加工參數改變所產生的效應有較佳的預測。
    探究加工參數改變造成理論與實驗在定量上產生的差異，其原因可能為實驗時，胚料導角面刮除胚料與模接觸面的潤滑油造成潤滑劑原有潤滑效果失效所致，故實際的摩擦因子應較環壓試驗所測得值為高。

    摘要Ⅰ 目錄Ⅱ 圖表說明IV 符號說明IX 第一章 緒論 1-1 前言......................................1 1-2 文獻回顧..................................2 1-3 研究動機與目的............................7 1-4 本論文主要架構............................8 第二章 面對稱擠製問題 2-1 理論分析基本假設..........................9 2-2 模具幾何尺寸..............................9 2-3 胚料材料性質與幾何尺寸....................11 2-2 摩擦條件..................................11 第三章 基本理論 3-1 剛塑有限元素之理論推導....................12 3-2 Update Lagrangian Formulation(ULF)介紹....18 3-3 接觸問題之處理............................18 3-1-1 接觸之定義..........................19 3-1-2 接觸面摩擦效應之處理................20 3-4 收斂檢查..................................21 第四章 MARC有限元素軟體的應用 4-1 MARC程式編輯..............................22 4-2 模擬擠製模式的建立........................24 4-2-1 模具外型的建立......................24 4-2-2 網格的建立與元素的選取..............24 4-3 輸入邊界條件 4-3-1 邊界設定............................25 4-3-2 材料設定............................25 4-3-3 可變形體與剛體設定..................26 4-3-4 製程控制............................26 4-4 MARC模擬設定 4-4-1 模式的設定..........................27 4-4-2 接觸之處理程序......................28 4-5 圖形輸出..................................29 第五章 結果與討論 5-1 胚料導角對解的影響........................31 5-1-1 變形場解............................32 5-1-2 近似應變分布解......................33 5-1-3 擠製力解............................36 5-2 摩擦對解的影響............................37 5-2-1 變形場解............................37 5-2-2 近似應變分佈解......................38 5-2-3 擠製力解............................38 5-3 胚料導角效應的修正........................39 第六章 結論與建議 6-1 結論......................................40 6-2 建議......................................41 參考文獻......................................80 附錄..........................................84

    1.Abrinia, K., A generalized upper-bound method for the solution of three-dimensional extrusion of shaped sections using CAD/CAM, " Thesis, UMIST, 1991.
    2.Archard, J. F., J. Appl. Phys. 24 pp.981. 1953.
    3.Celik, K. F., and Chitkara N. R., " Application of an upper bound method to off-centric extrusion of square sections, analysis and experiments," International Journal of Materials Sciences, pp. 321-345, 2000.
    4.Chanda, T., and Zhou, J., and Kowalski, L., and Duszczyk, J., ŗD FEM Simulation Of The Thermal Events During AA6061 Aluminum Extrusion," Scripta Materialia, Vol. 41, No. 2, pp. 195-202, 1999.
    5.Chitkara, N. R., and Abrinia, K., "A generalized upper-bound solution for three-dimensional extrusion of shaped sections using CAD/CAM bilinear surface die, " 28th Internation Matador Conference, 18-19, 1990.
    6."Element Library," MARC Analysis Research Corporation. Volume B. Version K7.
    7.Gouveia, B. P. P. A., and Rodrigues, J. M. C., and Bay, N., and Martins, P. A. F., " Ddeformation analysis of the round-to —square extrusion: a numerical and experiment investigation," Finite Element in Analysis and Design, " pp. 269-282, 2000.
    8.Gouveia, B. P. P. A, and Rodrigues, J. M. C, and Martins, P. A. F., " Steady-state finite-element analysis of cold forward extrusion," Journal of Materials Processing Technology, pp. 281-288, 1998.
    9.Hill, R., "Mathematical Theory of Plasticity," pp.178-191, Clarendon, Oxford, 1951.
    10.Hoshino, S., and Gunasekera, J. S., "An upper-bound solution for the extrusion of square section from round bar through converging dies, " 21st Machine Tool Design Research Conference, 1980:97
    11.Hwang, B. C., and Hong, S. J., and Bae, W. B., "An UBET Analysis of the Non-axisymmetric Extrusion/Forging Process," Journal of Materials Processing Technology, vol.111 pp. 135-141, 2001.
    12.Johnson, W., "The Pressure for the Cold Extrusion of Lubricated Rod Through Square Dies of Moderate Reduction at Slow Speeds," Journal of the Institute of Metals, vol. 85, pp.403-408, 1956-57.
    13.Kiuchi, M., and Ishikawa, M., "Upper bound analysis of extrusion and/or drawing of L-,T-,Hsections, "JSTP,24(270),pp722,1983.
    14.Lee, G. A, Im,Y. T., " Finite-element investigation of the wear and elastic deformation of dies in metal forming," Journal of Materials Processing Technology, pp. 123-127, 1999.
    15.Lee, N. K., and Yoon, J. H., and Yang, D. Y., "Finite Element Analysis Of Large Deformation By Automatic Renoding As A Weak Remeshing Technique," International Journal of Materials Sciences, pp. 255-273, 1992.
    16.Male, A. T. and Cockcroft, M. G., "A Method for the Determination of the Coefficient of Friction of Metals under Conditions of Bulk Plastic Deformation," Journal of the Institute of Metals, pp. 38-46, 1964-65.
    17.Mcmeeking, R. M., and Rice, J. R., "Finite Element Formulation for Problem of Large Elastic-pladtic deformation," International Journal of Materials Sciences, Vol.11, pp. 601-616, 1975.
    18." Mentat Command Reference," MARC Analysis Research Corporation. Version 3.1, pp. 3-345~3-350.
    19.Osakada, K., and Mori, K., and Yamaguchi, H. "Prediction of Curvature of an Extruded Bar With Noncircular Cross-Section By A 3-D Rigid-Plastic Finite Element Method, " International Journal of Materials Sciences, Vol.35, pp.879, 1986.
    20.Sahoo, S. K., and Kar, P. K., and Singh, K. C., "A Numerical Application of the Upper-Bound Technique For Round-to —Hexagon Extrusion Through Linearly Converging Dies, " Journal of Materials Technology,Vol. 91, pp.105-110, 1999.
    21.Shin, Hyun-Woo., and Kim, Dong-Won., and Kim, Naksoo., "A simplified three-dimensional finite-element analysis of the non-axisymmetric extrusion processes, " Journal of Materials Technology,Vol. 38, pp.567-587, 1993.
    22.Shiro Kobayashi, Soo-Ik Oh, Taylan Altan, " Metal Forming and the Finite-Element Methed," pp.110-110, Oxford university Press, 1989.
    23."Theory and user information," MARC Analysis Research Corporation. Volume A. Version K7.
    24.Yang, D. Y., and Han, C. H., and Kiuchi, M., "A New Formulation Three- Dimensional Extrusion and its Application to Extrusion of Clover Section," International Journal of Materials Sciences, Vol.28, 1986.
    25.Yang, D. Y., and Yoon, J.H., "Finite Element Analysis of Steady-State Three-Dimensional Extrusion of Section Through Curved Dies, " International Journal of Materials Sciences, Vol.31, No.2, pp. 145-156, 1989.
    26.Yang, D. Y., and Yoon, J.H., and Park, Y. B., " Finite Element Analysis of Steady-State Three-Dimensional Helical Extrusion of Twisted Section Using Recurrent Boundary Conditions, " International Journal of Materials Sciences, Vol.36, No.2, pp. 137-148, 1994.
    27.何信森﹐”方杯引伸成形之彈塑性有限元素分析”﹐碩士論文﹐國立中央大學機械所﹐1999
    28.徐享乾﹐"以變分上界限法分析任意面對稱截面之擠製加工問題"﹐碩士論文﹐國立中央大學機械所﹐1997.
    29.江卓培﹐”漸開線外齒輪鍛造之有限元素分析”﹐碩士論文﹐國立中央大學機械所﹐1999
    30.張仕冬﹐"三維面對稱擠製之實驗研究"﹐碩士論文﹐國立中央大學機械所﹐1998.

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