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博碩士論文 etd-0214117-153156 詳細資訊
Title page for etd-0214117-153156
論文名稱
Title
大徑薄壁鎂合金管材之熱間擠製之研究
Study on Hot Extrusion of Large-diameter Magnesium Alloy Thin Tubes
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
87
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2016-07-22
繳交日期
Date of Submission
2017-03-14
關鍵字
Keywords
大徑薄壁管、鎂合金、擴孔分流模、有限元素解析、田口法、熱間擠製
Magnesium alloy, Large-diameter thin tubes, Extension port-hole die, Finite element analysis, Taguchi methods, Hot extrusion
統計
Statistics
本論文已被瀏覽 5733 次,被下載 241
The thesis/dissertation has been browsed 5733 times, has been downloaded 241 times.
中文摘要
鎂合金薄板因為具有高比強度,而被廣泛運用在各領域包含運輸業、電子業等。比起使用壓延方式來製造鎂合金薄板,擠製方式會具有更好的成形性,一般寬的鎂合金薄板擠製需要使用大型擠製機台,為了降低擠製負載並且使用較小的擠製機,擴孔分流模的設計技術是必須的。
本文主旨為以熱間擠製方式製造大徑薄壁管。使用的擠錠材料為MB8鎂合金,並藉由壓縮試驗得到擠錠之塑流應力。文中首先針對擴孔分流模之設計進行說明與比較,接著以有限元素模擬軟體DEFORM-3D分析在鎂合金管熱間擠製過程中,擠錠於模具內的塑性變形模式,並討論模具參數的變化對於擠製負載及模具應力分布的影響為何。之後藉由田口法討論各參數對於銲合壓力之影響以最佳化模具之設計。鎂合金管的熱間擠製實驗將會使用2100噸(20.6MN)的擠製機台配合選用的7吋擠錠,實驗結果所得到的擠製負載與產品尺寸將與模擬結果進行比較,以驗證模具設計技術與有限元素模型之適用性。
Abstract
Thin magnesium alloy sheets are widely used in various fields such as transportation, electronics industries, etc., because of their high specific strength. Thin magnesium thin sheets made by extrusion processes have better formability compared with those made by rolling processes. Manufacturing of wide magnesium thin sheets by extrusion requires a large extrusion machine. To decrease the extrusion load and use a smaller extrusion machine, an extension port-hole die design technique is required.
In this study, large-diameter thin tubes are manufactured by hot extrusion processes. Magnesium alloy MB8 is used as the billet material. The flow stress of the billet is obtained by compression tests. Firstly, a design criterion of port-hole die is proposed. Then, a finite element simulation software DEFORM-3D is adopted to analyze the plastic deformation pattern of the billet inside the die during hot extrusion process of magnesium alloy tubes. The effects of various die parameters on the extrusion load and die stress distributions are discussed. By using the Taguchi Methods to analysis the controlling factors of welding pressure, the port-hole die can be optimized. Experiments of hot magnesium tube extrusion using a 2100-ton extrusion machine for 7-inch billets are conducted. Experimental results of extruded loads and product dimensions are compared with the simulation results to verify the validity of the finite element modelling and the die design technique proposed.
目次 Table of Contents
論文審定書 i
誌謝 ii
摘要 iii
Abstract iv
目錄 v
圖目錄 vii
表目錄 xi
第一章 緒論 1
1.1前言 1
1.2鎂合金特性 2
1.3擠製製程簡介 3
1.4模具設計之原則 5
1.5文獻回顧 6
1.6研究動機與論文架構 11
第二章 大徑圓管擠製之有限元素分析 13
2.1大徑圓管所用之模具介紹 13
2.1.1分流模之基本結構 13
2.1.2傳統模具與擴孔模具之比較 14
2.1.3分流孔、分流道、銲合室、軸承部之設計 15
2.2鎂合金圓管擠製有限元素分析之模組建立 21
2.2.1有限元素分析軟體DEFORM -3D簡介 21
2.2.2大徑圓管之幾何尺寸與擠製模型建立 22
2.2.3模擬條件設定 24
2.2.4網格收斂性分析 25
2.3大徑圓管擠製之製程參數研究 26
2.3.1擠製負載比較 27
2.3.2模具應力分析 30
2.4以田口法探討模具較佳參數 37
2.4.1田口法之基本原理[21][22] 37
2.4.2模具控制因子與水準之選定 41
2.5田口法解析結果 45
2.5.1直交表之模擬結果 45
第三章 擠製實驗與分析 51
3.1 MB8鎂合金壓縮試驗 51
3.2鎂合金熱間擠製實驗 54
3.2.1實驗設備與流程 54
3.2.2實驗結果 56
3.3最佳化模具實驗 60
3.3.1實驗設備介紹 60
3.3.2實驗流程 64
3.3.3模具的設計與製作 65
3.3.4模擬與實驗之參數設定 67
3.3.5實驗結果 68
第四章 結論 71
4.1研究成果 71
參考文獻 73
參考文獻 References
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