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姓名 廖佑懷(You-huai Liao)  查詢紙本館藏   畢業系所 機械工程學系
論文名稱 超音波振動輔助多道次等通道彎角擠製之研究
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摘要(中) 本文探討超音波振動對於多道次等通道彎角擠製(multi-pass ECAE)之效應。藉由改變沖頭軸向超音波振幅進行三種路徑(Route A、B、C)的四道次ECAE擠製,觀察沖頭負載與擠錠機械性質之效應。並以有限元素模擬軟體Deform-3D分析多道次之成形負載驗證與超音波振動沖頭負載之變化。實驗結果顯示超音波振動對於降低ECAE成形負載有良好的效果,軸向超音波加載可使擠錠之硬度略微提升,並且可以大幅改善路徑B的硬度均勻性。有限元素模擬結果顯示,應用Deform-3D模擬分析超音波振動輔助與多道次ECAE之結果與實驗之結果具有良好的相似性。
摘要(英) This paper investigates the axial ultrasonic vibration assisted multi-pass equal channel angular extrusion by experiment and FEM simulation.
Experimentally change three different route (Route A, Route B and Route C) and ultrasonic applied or not to investigate the forming load, billet′s hardness and surface roughness.
Experiment results show that application of ultrasonic vibration can make reduction of forming load of multi-pass ECAE processes. While in the condition of route B and route C, ultrasonic vibration make billet′s hardness distribution more uniformly.
Furthermore, using FEM software Deform-3D to simulated load-stroke curve and load were also compared with the experimentally recorded load-stroke curve and load. Simulation results show that good conformity is observed between the FEM simulation and experimental results.
關鍵字(中) ★ 超音波
★ 等通彎角擠製
★ 路徑
關鍵字(英)
論文目次 摘要 i
Abstractii
致謝 iii
符號表 iv
目錄 vi
表目錄 ix
圖目錄 xi
第一章 緒論 1
1.1 前言 1
1.2 文獻回顧 3
1.3 研究目的與動機 10
第二章 基本理論 11
2.1 等通道彎角擠製(ECAE)製程 11
2.2 多道次ECAE 12
2.3 超音波塑性加工原理 15
2.3.1 超音波加工理論 15
2.3.2 超音波降低介面摩擦應力之機制 15
第三章 實驗設備與方法 22
3.1 實驗設備 22
3.2 實驗方法 30
3.2.1 試片材料 30
3.2.2 實驗條件 30
3.3 實驗步驟 31
3.4 實驗量測 33
3.4.1 顯微維克氏硬度計量測 33
3.4.2 表面粗糙度量測 34
第四章 實驗結果與討論 35
4.1 超音波振動對多道次ECAE成形力之影響 35
4.2 ECAE擠錠硬度之影響 42
4.2.1 多道次ECAE擠錠硬度 43
4.2.2 多道次ECAE擠錠硬度均勻性 44
4.2.3 超音波振動之多道次ECAE擠錠硬度 51
4.2.4 超音波振動對硬度均勻性之影響 57
4.3 超音波振動對四道次ECAE擠錠表面粗糙度之影響 60
4.4 有限元素分析 64
4.4.1 前言 64
4.4.2 應用DEFORM-3D於超音波輔助ECAE之操作程序 66
4.5 超音波輔助多道次ECAE有限元素模擬與實驗驗證 72
4.5.1 多道次ECAE模擬 72
4.5.2 實驗驗證 79
4.5.3 超音波振動加載驗證 81
4.5.4 有限元素模型檢驗臨界速度 82
第五章 結論與建議 85
5.1 結論 85
5.2 建議 86
參考文獻 87
附錄 91
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指導教授 葉維磬(Wei-Ching Yeh) 審核日期 2014-7-28
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