磁場輔助微電化學鑽孔加工特性之研究

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姓名

林聖育(Sheng-yu Lin) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

磁場輔助微電化學鑽孔加工特性之研究
(An Investigation of Magnetic Field Assisted Electrochemical Micro Drilling)

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摘要(中)

本研究利用磁場輔助微電化學鑽孔，進行一系列加工特性之研究，內容主要可分為兩大部分：
第一部分研究加入磁場對電化學加工造成的效益。實驗結果顯示：電場中加入磁場會產生勞侖茲力，可影響帶電離子的運動，因此可以促進電解液更新，提升加工效率與精度。如欲擁有最大的加工能力，須將磁場以90°放置，因此時磁場方向與電場方向垂直，方能產生最大的勞侖茲力。運用磁場輔助電化學加工，在不旋轉電極、不施予沖流的加工條件下，可得到直徑最小為407 μm之微孔。但由於本研究使用的電極側邊並未絕緣，會產生較大的雜散電流腐蝕區域，因此下部份將就縮小雜散電流影響區，提出新的加工方法並進行研究。
第二部分是向上加工之特性研究。以向上進給方式進行加工時，其概念類似混氣電解加工。藉由電化學反應生成的氣泡在工件表面累積形成保護層，將可有效減少雜散電流影響區面積，並同步減少擴孔量而提升加工精度。以向上加工進行微電化學鑽孔時，能有效改善雜散電流的腐蝕情況，其環帶寬度最小可降低至106 μm。

摘要(英)

The Study discusses the machining properties of magnetic field assisted micro electro-chemical drilling. It includes two major parts. First, the advantages of magnetic field assisted method are confirmed. The results reveal that the Lorentz force is helpful to renew the electrolyte to promote the machining efficiency and accuracy. When the magnet field direction is set perpendicular to the electrical field, the maximal Lorentz force is induced to increasing machining efficiency observably. With magnetic assist, the minimal micro hole with ψ407 μm is processed, even though the tool electrode doesn’t rotate between the working time. Furthermore, when the electrode doesn’t rotate, the straying current corrosion area occurred around the entrance edge will expand. To overcome this problem, a new upward feed machining method is presented.
Second, the machining properties of upward feed mode are investigated. The conception of upward feed mode is similar to gas mixed electrochemical machining. Because the reaction bubbles assemble on the workpiece surface like a protection layer, the straying current corrosion area and the hole-enlargement are reduced, and the machining accuracy is increased. In the upward mode, the straying current corrosion is improved effectively, and the annulus width is reduced to minimal 106 μm.

關鍵字(中)

★ 雜散電流影響區
★ 向上加工
★ 勞侖茲力
★ 磁場
★ 微電化學鑽孔

關鍵字(英)

★ Electrochemical micro drilling (ECMD)
★ Upward feed mode
★ Straying current corrosion area
★ Lorentz force
★ Magnetic field

論文目次

摘要 i
Abstract ii
謝誌 iii
目錄 vii
圖目錄 x
表目錄 xiii
第一章緒論 1
1-1 前言 1
1-2 研究動機與目的 3
1-3 文獻回顧 5
1-4 研究架構 9
第二章實驗基礎原理 10
2-1 電化學加工的基礎理論[5] 10
2-1-1 電化學反應機制 10
2-1-2 法拉第定律(Faraday’s Law) 12
2-1-3 歐姆定律(Ohm’s law) 13
2-1-4 電極電位-金屬與溶液界面雙電層理論 14
2-1-5 陽極極化曲線及其特徵 15
2-2 磁場理論 17
2-2-1 右手開掌定則 17
2-2-2 勞倫茲力(Lorentz´s force)[42-43] 18
2-3氣泡影響電化學加工理論[44-46] 20
2-3-1空隙分數(Void Fraction) 20
2-3-2電解液導電度(Conductivity) 20
第三章實驗設備與材料 21
3-1 基礎實驗相關設備 21
3-2 實驗材料 30
第四章微電化學鑽孔加工特性之研究 33
4-1 實驗簡介 33
4-2 實驗設備 33
4-3 實驗流程與方法 35
4-4 結果與討論 38
4-4-1 工作電壓對微孔之影響 38
4-4-2磁場設置角度對微孔之影響 44
4-4-3 進給速率對微孔之影響 52
4-4-4 脈衝時間對微孔之影響 54
4-5 結論 58
第五章磁場輔助微電化學向上加工特性之研究 59
5-1 實驗簡介 59
5-2 實驗設備 60
5-3 實驗流程與方法 62
5-4 結果與討論 65
5-4-1 工作電壓對向上加工微孔之影響 65
5-4-2磁場設置角度對向上加工微孔之影響 68
5-4-3 進給速率對微孔之影響 71
5-4-4 脈衝時間對微孔之影響 72
5-5 結論 74
第六章總結論 75
參考文獻 77

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指導教授

顏炳華(Biing-hwa Yan)

審核日期

2011-7-20

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