超音波對1070鋁合金等通道彎角擠製加工及其材料行為效應之研究

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姓名

陳郁輔(Yuh-Fu Chen) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

超音波對1070鋁合金等通道彎角擠製加工及其材料行為效應之研究

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摘要(中)

本文以實驗方式探討超音波振動輔助對於等通道彎角擠製(ECAE)之影響。本文超音波加載方式分為軸向加載、橫向加載及組合雙軸向加載，以最大成形力、成形總能量及平均成形力三個觀點比較不同沖頭行程位置加載超音波振動的影響。
本文並進行超音波拉伸實驗，取得超音波振動下材料拉伸數據，建立材料在超音波加載狀況下的塑性應力-應變關係式。並利用所得之材料參數，進行有限元素模擬分析，驗證有線元素模擬對於超音波輔助加載ECAE之可行性。
實驗結果顯示，在超音波輔助ECAE製程中，不論是單獨施加軸向、橫向或是同時雙軸向加載，對於降低成型力均有良好的效應。利用有限元素模擬分析，調整有限元素模型內的材料性質建立其等效模型，提出超音波軟化及摩擦力減少兩種機制皆存在於超音波輔助ECAE的製程中。

摘要(英)

This study aims to explore experimentally the influence of ultrasonic vibration on equal channel angular extrusion (ECAE).The ultrasonic system divided in axial direction, lateral direction and both two direction. Use the maximum forming force, maximum total energy and average forming force to compare the effects of ultrasonic vibration.
In this paper, applying ultrasonic vibration in tensile test. Establish material plastic stress - strain relationship with ultrasonic vibration. Also in Deform-3D finite element software to analyze the equal channel angular extrusion(ECAE) that applied with the ultrasonic vibration.
The experimental results shows that ultrasonic vibration on ECAE, whether in axial direction, lateral direction or simultaneous biaxial loading, for lower forming force and enhance the hardness of the specimen both have good effect. Using the finite element to analyze, adjust the contact conditions and material properties of finite element model to build the equivalent model. Putting forward the acoustic softening and friction reduction are both may exist in process of ultrasonic vibration on ECAE.

關鍵字(中)

★ 超音波
★ 等通道彎角擠製

關鍵字(英)

論文目次

摘要 i
目錄 vii
圖目錄 xi
表目錄 xvii
第一章緒論 1
1.1 前言 1
1.2 文獻回顧 2
1.2.1超音波輔助塑性加工: 2
1.2.2等通道彎角擠製加工: 7
1.3 研究動機 11
第二章基本理論 13
2.1 等通道彎角擠製(ECAE)製程 13
2.2 超音波基本理論 14
2.2.1 體積效應(volume effect) 15
2.2.2 表面效應(surface effect) 16
第三章實驗設備及方法 20
3.1 實驗設備 20
3.1.1 ECAE模具 20
3.1.2 超音波振動系統 20
3.1.3 100噸油壓試驗機 21
3.1.4 資料結取系統 21
3.1.5 拉伸試驗機 21
3.1.6 超音波輔助拉伸系統設計 22
3.2 實驗方法 22
3.2.1 ECAE試片製作 22
3.2.2 實驗條件 23
3.2.3 ECAE實驗步驟 24
3.2.4 拉伸試驗 25
3.2.5 超音波加載拉伸試驗 26
第四章實驗結果與討論 27
4.1超音波振動輔助ECAE 27
4.2超音波振動對於ECAE之影響觀察 27
4.3不同沖頭行程位置加載軸向超音波對於ECAE之影響 28
4.3.1最大成形力及成形總能量 29
4.3.2平均成形力 30
4.4不同行程位置加載橫向超音波對於ECAE之影響 30
4.4.1最大成形力及成形總能量 31
4.4.2平均成形力 32
4.5雙軸向超音波振動對於ECAE之影響 32
4.5.1最大成形力及成形總能量 33
4.5.2平均成形力 34
4.6拉伸試驗 35
4.7超音波輔助拉伸試驗 36
4.8 超音波振動輔助ECAE有限元素分析 37
4.8.1 傳統ECAE有限元素分析 37
4.8.2 超音波輔助ECAE等效模型 38
第五章結論與建議 40
5-1 結論 40
5-2 建議 42
參考文獻 43
圖片 52
表 84
附錄A 87
附錄B 94
附錄C 101

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指導教授

葉維磬

審核日期

2016-8-23

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