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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 陳復國 | |
dc.contributor.author | Yu-Ming Chang | en |
dc.contributor.author | 張育銘 | zh_TW |
dc.date.accessioned | 2021-06-12T17:58:16Z | - |
dc.date.available | 2016-08-12 | |
dc.date.copyright | 2011-08-12 | |
dc.date.issued | 2011 | |
dc.date.submitted | 2011-08-09 | |
dc.identifier.citation | [1] C. Husson, J.P.M. Correia, L. Daridon and S. Ahzi, “Finite elements simulations of thin copper sheets blanking : study of blanking parameters on sheared edge quality”, Journal of Materials Processing Technology, 99, pp. 74-83, 2008.
[2] F. R, Biglari, A.T. Kermani, M.H. Parsa, K.M. Nikbin and N.P. O’Dowd, “Comparison of fine and conventional blanking based on ductile fracture criteria”, 7th Biennial ASME Conference on Engineering Systems Design and Analysis, 2004. [3] 李炳坤, “鋼鐵產品之二次加工技術-衝壓成形”, 中國鋼鐵公司 鋼鋁研究發展處 產品應用研究室. [4] M. Samuel, “FEM simulations and experimental analysis of parameters of influence in the blanking process”, Journal of Materials Processing Technology, 84, pp. 97-106, 1998. [5] G. Fang, P. Zeng and L. Lou, “Finite element simulation of the effect of clearance on the forming quality in the blanking process”, Journal of Materials Processing Technology, 122, pp. 249-254, 2002. [6] T.S. Kwak, Y.J. Kim and W.B. Bae, “Finite element analysis on the effect of die clearance on shear planes in fine blanking”, Journal of Materials Processing Technology, 130-131, pp. 462-468, 2002. [7] K.H. Shim, S.K. Lee, B.S. Kang and S.M. Hwang, “Investigation on blanking of thin sheet metal using the ductile fracture criterion and its experimental verification”, Journal of Materials Processing Technology, 155-156, pp. 1935-1942, 2004. [8] N. Hatanaka, K. Yamaguchi, N. Takakura and T. Iizuka, “Simulation of sheared edge formation process in blanking of sheet metals”, Journal of Materials Processing Technology, 140, pp. 628-634, 2003. [9] S. Thipprakmas, M. Jin and M. Murakawa, “An investigation of material flow analysis in fineblanking process”, Journal of Materials Processing Technology, 192-193, pp. 237-242, 2007. [10] S. Thipprakmas, “Application of Taguchi technique to investigation of geometry and position of V-ring indenter in fine-blanking process”, Materials and Design, 2009. [11] S. Thipprakmas, “Finite element analysis of V-ring indenter mechanism in fine-blanking process”, Materials and Design, 30, pp. 526-531, 2009. [12] M. Sasada, H. Kobayashi and I. Aoki, “Study on piercing mechanism of small holes”, Journal of Materials Processing Technology, 177, pp. 649-652, 2006. [13] R. Matrumoto, T. Kubo and K. Osakada, “Cold piercing of magnesium alloy billet with high aspect ratio”, International Journal of Machine Tools & Manufacture, 46, pp. 459-466, 2006. [14] 笹田昌弘, 青木 勇, “小穴抜きの加工機構と問題点”, プしス技術, 46, pp. 23-27, 2008. [15] A.M. Goijaerts, L.E. Govaert and F.P.T. Baaijens, “Prediction of ductile fracture in metal blanking”, Journal of Manufacturing Science and Engineering, 122, pp. 476-483, 2000. [16] Freudenthal and A.M., “The inelastic behaviour of engineering materials and structure”, John Wiley, 1950. [17] Cockcroft, M.G. and D.J. Latham, “Ductility and workability of metals”, J. Inst. Metals, pp. 33-39, 1966. [18] Brozzo, P., B. Deluca and R. Rendina, “A new method for the prediction of formability limits in metal sheets, sheet metal forming and formability”, Proceeding of the Seventh Biennial Conference of the International Deep Drawing Research Group, 1972. [19] McClintock and F.A., “A criterion for ductile fracture by the growth of holes”, Trans. ASME J. Applied Mech., pp. 363-371, 1968. [20] E. Taupin, J. Breitling, Wei-Tsu Wu and T. Altan, “Material fracture and burr formation in blanking results of FEM simulations and comparison with experiments”, Journal of Materials Processing Technology, 59, pp. 68-78, 1996. [21] B.Y. Joo, S.I. Oh and B.H. Jeon, “Development of micro punching system”, Manufacturing Technology, 50, pp. 191-194, 2001. | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/27219 | - |
dc.description.abstract | 隨著各種高科技產品的微小化與精密化,市場產品對細長孔之需求與日俱增,因此相關細長沖孔成形技術亟需提升。目前針對一般沖孔厚徑比(Aspect ratio)即t/D(t:板厚、D:沖頭直徑)較小之沖孔成形研究已趨完整,但對於厚徑比較大之沖孔技術則尚未成熟,因此高厚徑比沖孔成形之研究值得進一步的探討。
本研究首先以SPCC板材三道次高厚徑比沖孔進行臨界破壞值之驗證,除選擇較佳之延性破壞準則Normalized Cockcroft & Latham外,並獲得正確之臨界破壞值。其次探討高厚徑比沖孔與一般沖孔不同厚徑比之差異性,探討高厚徑比沖孔與一般沖孔機制之差異性,並由此差異性針對間隙、壓料力、潤滑性及不同材料進行分析探討。 由上述分析之結果,針對板材S45C高厚徑比沖孔沖頭造型及多道次進行設計,使得沖頭承受較低之沖頭力,並由沖頭受力分析可得沖頭減少承受25%之應力值。此外,本研究針對不同之製程參數,包括:間隙、壓料力及潤滑性,對高厚徑比沖孔成形之影響進行探討,並確認了較佳之製程參數。最後進行相關之實驗驗證,其結果顯示本研究之分析具有相當之準確度,可提供未來從事類似研究之參考。 | zh_TW |
dc.description.abstract | With the ongoing market trend, there is a growing demand on micro products. In the manufacturing process of a micro part, the hole-piercing is commonly involved. Though the hole-piercing process with low thickness to diameter (t/D) ratio has been well-developed, the process for piercing a hole with a high t/D ratio is not yet matured. In addtion, due to the high t/D ratio, the hole usually can not be pierced in one single operation and a multi-operation process is required.
In the present study, piercing of high t/D ratio holes with multiple operations was examined by both the finite element analysis and the experimental approaches. In order to facilitate the finite element analysis in determination of element elimination, the fracture criterion and the critical value for separating the materials were studied first by comparing the experimental phenomenon and the finite element simulation results. Various fracture criteria adopted by the DEFORM software were examined. The tension tests were conducted and the stretches of the specimens to fracture were recorded, comparing with those obtained from the finite element simulations. The comparison indicates that the simulation results with the Normalized Cockcroft & Latham ductile fracture criterion agree well with the experimental data. With the proper ductile fracture criterion used, the piercing mechanism for different t/D ratios was investigated. The effects of process parameters, such as the die clearance, holder force, and lubrication condition on the piercing force and cutting edge quality were determined. The multiple operations for piercing a high t/D ratio hole on a S45C sheet were then designed based on the optimum process parameters obtained from the previous study. In order to obtain a smaller punch force and acceptable cutting edge, the number of operations, die clearance and punch shape were optimized according to the finite element analysis. The actual multi-operation hole piercing process was also implemented and the experimental data are compared with those obtained from the finite element results. The efficiency and the accuracy of the analysis model developed in the present study were then validated. | en |
dc.description.provenance | Made available in DSpace on 2021-06-12T17:58:16Z (GMT). No. of bitstreams: 1 ntu-100-R98522509-1.pdf: 8970795 bytes, checksum: 46d3aa12499f17c0f15ec0edd67f7d00 (MD5) Previous issue date: 2011 | en |
dc.description.tableofcontents | 目錄 I
圖目錄 IV 表目錄 XIII 第一章 緒論 1 1.1 研究背景與動機 1 1.2 研究目標 2 1.3 研究方法 3 1.4 文獻收集與歸納整理 7 1.4.1 精密沖剪 7 1.4.2 高厚徑比沖孔 19 1.4.3 延性破壞準則 24 1.5 論文總覽 29 第二章 材料機械性質與摩擦試驗 31 2.1 拉伸試驗 31 2.1.1 拉伸試驗規劃 31 2.1.2 拉伸應力-應變曲線 33 2.2 摩擦試驗 39 2.2.1 摩擦試驗規劃 39 2.2.2 表面粗糙度量測 43 2.2.3 摩擦試驗結果 44 第三章 延性破壞準則之分析與驗證 49 3.1 建立SPCC板材臨界破壞值 49 3.1.1 模擬拉伸試驗 50 3.1.2 驗證拉伸試驗 56 3.2 SPCC板材沖孔模擬與驗證 63 3.2.1 模具幾何參數設定 63 3.2.2 第一道次半沖孔模擬與臨界破壞值驗證 65 3.2.3 第二道次沖孔模擬與臨界破壞值驗證 70 3.2.4 第三道次內孔刮光模擬與臨界破壞值驗證 73 第四章 不同厚徑比之沖孔成形分析 77 4.1 機制探討 77 4.2 間隙影響性 84 4.3 壓料力影響性 88 4.4 潤滑影響性 90 4.5 材料影響性 92 第五章 沖頭造型與製程參數對高厚徑比沖孔成形分析 94 5.1 建立S45C板材臨界破壞值 94 5.2 沖頭造型設計 96 5.2.1 一道次沖頭設計 96 5.2.2 多道次沖頭設計 101 5.3 不同沖程之研究 108 5.4 高厚徑比孔製程參數分析 111 5.4.1 間隙 111 5.4.2 壓料力 113 5.4.3 潤滑性 117 5.5 沖頭受力分析 119 第六章 結論 124 參考文獻 127 | |
dc.language.iso | zh-TW | |
dc.title | 高厚徑比多道次沖孔成形之研究 | zh_TW |
dc.title | Piercing of High Thickness to Diameter Ratio Holes with Multiple Operations | en |
dc.type | Thesis | |
dc.date.schoolyear | 99-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 黃永茂,徐瑞坤,李榮顯 | |
dc.subject.keyword | 沖孔,厚徑比,延性破壞準則,臨界破壞值,沖頭造型設計,多道次,CAE分析, | zh_TW |
dc.subject.keyword | hole-piercing,high thickness to diameter (t/D) ratio,ductile fracture criterion,critical fracture value,punch shape design,multiple operations,finite element analysis,experimental validation, | en |
dc.relation.page | 129 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2011-08-09 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 機械工程學研究所 | zh_TW |
顯示於系所單位: | 機械工程學系 |
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