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研究生:李坤蔚
研究生(外文):Kun-wei Li
論文名稱:不鏽鋼管彎曲加工製程之分析
論文名稱(外文):An Analysis of Stainless Tube Bending Process
指導教授:黃佑民黃佑民引用關係
指導教授(外文):You-min Huang
口試委員:黃佑民
口試日期:2012-07-25
學位類別:碩士
校院名稱:國立臺灣科技大學
系所名稱:機械工程系
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
語文別:中文
論文頁數:100
中文關鍵詞:彎曲加工不鏽鋼管
外文關鍵詞:bendingstainless tube
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薄壁圓管彎曲過程可能會產生皺褶現象,是不樂意想得到的結果,生產技術之關鍵在於迅速且準確的預防此現象的產生。本論文之主要研究內容即使用有限元素分析模擬,模擬薄壁管彎曲成形過程,根據不同階段的網格變形,以獲得沿著彎曲方向的應力分佈、管壁厚度的變化與斷面變形之關係,進而判斷出合理之加工製程。此外,將模擬結果與實驗結果作比較,以驗證模擬分析結果之可信性。期盼此研究結果能夠提供業者作為參考,累積薄壁圓管彎曲加工之經驗,提升產品之附加價值,進而提升產業之競爭力。
Thin-walled tube bending processes may produce a wrinkling phenomenon if the process parameters were inappropriate. How to predict this phenomenon effectively and accurately is one of the urgent key problems to be solved for the development of this process. By the use of this FE simulation system, a bending process of thin-wall tube had been simulated, and deformed process were recorded under different bending stages. As a result, the stress distribution along the bending direction, and the relationship between the wall thickness variation and cross-section deformation had been obtained, and could thus judge the feasibility of every manufacturing procedure. The experimental results of thin-walled tube bending process were compared with the simulation results. The results of both after compensation were agreeable. The manufacturers can hopefully apply these results to the bending process of stainless tube manufacturing.
摘要 I
ABSTRACT II
誌謝 III
目錄 V
表目錄 VIII
圖目錄 IX
第一章 緒論 1
1.1前言 1
1.2文獻回顧 2
1.3研究目的 4
1.4論文架構 5
第二章 基本理論 6
2.1金屬成形分析常用的方法 6
2.2彎曲成形加工介紹 8
2.2.1NC彎管機 8
2.2.2彎管製程技術 10
2.2.3彎管成形應力應變狀態 12
2.3成形極限圖(FLD)介紹 16
第三章 動態有限元素分析軟體 18
3.1 LS-DYNA簡介 18
3.2動態有限元素簡介 19
3.2.1前處理器 21
3.2.2主程式求解器 27
3.2.3後處理器 27
第四章 材料簡介與拉伸試驗 29
4.1不鏽鋼SUS304 簡介 29
4.2拉伸試驗 30
第五章 數值分析與實驗操作 33
5.1實驗設備與實驗模具 33
5.2實驗方法與步驟 35
5.3電腦數值模擬解析方法與步驟 45
5.4彎曲成形之數值模型 47
5.5數值分析與實驗結果比較 48
5.5.1成形履歷與成形極限圖 49
5.5.2心軸對圓管斷面之影響 56
5.5.3不同厚度圓管之應力分佈 61
5.5.4不同摩擦係數對厚度分佈之影響 65
5.5.5圓管斷面之真圓度 69
5.5.6圓管皺褶之現象 71
5.5.7不同外徑圓管之成形極限圖 75
5.5.8不同外徑圓管之斷面真圓度 77
第六章 結論 79
6.1結論 79
6.2未來之展望 79
參考文獻 82
作者簡介 84
1.L. G. Brazier, “ On the Flexure of Thin Cylindrical Shells and Other Thin Sections, ” Proceedings of the Royal Society of London, Vol. 116, pp. 104-114 (1927).
2.B. D. Reddy, “ An Experimental Study of the Plastic Buckling of Circular Cylinders Shells in Pure Bending, ” International Journal of Solids and Structures, Vol. 15, pp. 669-685 (1979).
3.E. Corona, and S. Kyriakides, “ An Experimental Investigation Degradation and Buckling of Circular Tubes Under Cyclic Bending and External Pressure, ” Thin-Walled Structures, Vol. 12, pp. 229-263 (1991).
4.S. Kyriakides, and G. T. Ju, “ Bifurcation and Localization Instabilities in Cylindrical Shells under Bending-I. Experiments, ” International Journal of Solids and Structures, Vol. 29, pp. 1117-1142 (1992).
5.F. Paulsen, and T. Welo, “ Application of Numerical Simulation in the Bending of Aluminium-Alloy Profiles, ” Journal of Materials Processing Technology, Vol. 58, pp. 274-285 (1996).
6.W. F. Pan, T. R. Wang and C. M. Hsu, “ A Curvature-ovalization Measurement Apparatus for Circular Tubes under Cyclic Bending, ” Experimental Mechanics, Vol. 38, No. 2, pp. 99-102 (1998).
7.E. Cornoa and S. Kyriakides, “ On the Collapse of Inelastic Tubes under Combined Bending and Pressure, ” International Journal of Solids and Structures, Vol.24, No. 5, pp. 505-535 (1998).
8.吳英豪,“塑性加工”,台南,復文書局,1983。
9.王同海,“管材塑性加工技術”,北京,機械工業出版社,1998。
10.F. Vollertsen, A. Sprenger, J. Kraus, and H. Arnet, “ Extrusion, Channel and Profile Bending: a Review, ” Journal of Materials Processing Technology, Vol. 87, pp. 1-27 (1999).
11.S. P. Keeler, and W. A. Backofen, “ Plastic Instability and Fracture in Sheets Stretched Over Rigid Punches, ” ASM Transactions Quarterly, Vol. 56, pp. 25-48 (1963).
12.G. M. Goodwin, “ Application of Strain Analysis to Sheet Metal Forming Problems in The Press Shop, ” SAE Technical Paper No. 680093 (1968).
13.勢流科技股份有限公司,LS-DYNA基礎課程上課講義,2003。
14.D. M. Friz, “ Alfried Krupp und Berthold Beitz - der Erbe und sein Statthalter, ” Orell Füssli, ISBN 3-280-01852-8 (1988).
15.I. M. Bernsten, D. Peckner, and R. Hill, McGraw, Handbook of Stainless Steels, New York (1977).
16.黃明彥,“不鏽鋼材SUS304 之橢圓杯引伸成形製程分析”,國立台灣科技大學機研所碩士論文,2007。
17.ASTM Standard, Designation:E646-93, “ Standard Test Method for Tensile Strain-Hardening Exponents (n-values) of Metallic Sheet Materials, ” Vol. 1402, pp. 558-564 (1996).
18.E. Rabinowicz, “ The Dependence of the Adhesive Wear Coefficient on the Surface Energy of Adhesion, ” Wear of Materials, ASME New York, pp. 36-40 (1977).
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