脈衝電化學加工過程中氣泡觀測與分析

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姓名

官佳儒(Chia-Ju Kuan) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

脈衝電化學加工過程中氣泡觀測與分析
(Air Bubble is Observed and Analyzed in the Pulse Electrochemical Machining)

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摘要(中)

脈衝電化學加工〈PECM〉是利用有規律的間歇供電進行間歇加工。而空隙分數是影響加工品質的重要因素之一。本實驗使用透明壓克力模具模擬流場場區，以氯化鈉水溶液作為電解液，並藉由控制脈衝頻率及電場、熱流場等參數，分析各參數對空隙分數〈Void Fraction〉的影響度。
實驗結論指出，影響空隙分數的氣泡層厚度隨著脈衝頻率減少而減少；而增加電壓、增加電解液濃度或降低流速會使氣泡層增厚。因此加工時若能配合固定電壓與濃度並控制電解液流速則可找出脈衝頻率與電解液流速的最適化條件進而有效降低空隙分數，提高產品生產品質。

摘要(英)

In the pulse electrochemical machining (PECM) a regular intermittent power is used to machine the product intermittently. However, the void fraction is the key factor for the product’s quality. In this experiment, a clear acrylic module is used to simulate the fluid field where the sodium chloride solution is chosen as the electrolyte. The pulse frequency, the electric field related parameters and thermal flow field related parameters are controlled to analyze the influence of parameters the void fraction.
Results show that the thickness of the boubble which effects the void fraction would decreases as the pulse frequency decreases. On the other hands, the thickness of the bubble increases as the voltage increases, the electrolyte concentration increases or the electrolyte flow speed decreases. Therefore, by fixing the voltage and concentration and well controlling the electrolyte flow speed, a optimal condition between the pulse frequency and the electrolyte flow velocity can be achieved. In turn, the void fraction decreases and the product quality is thus improved effectively.

關鍵字(中)

★ 脈衝頻率
★ 空隙分數
★ 脈衝電化學加工

關鍵字(英)

★ PECM
★ pulse frequency
★ Void Fraction

論文目次

摘要…………………………………………………………………… Ⅰ
英文摘要……………………………………………………………… Ⅱ
目錄…………………………………………………………………… Ⅲ
表目錄………………………………………………………………… Ⅵ
圖目錄………………………………………………………………… Ⅶ
符號說明……………………………………………………………… Ⅸ
第一章、緒論………………………………………………………… 1
1-1 前言…………………………………………………… 1
1-2 文獻回顧……………………………………………… 2
1-3 研究目的……………………………………………… 8
第二章、實驗原理…………………………………………………… 10
2-1法拉第定律、化學反應式及空隙分數……………… 10
2-1-1法拉第定律 10
2-1-2化學反應式 10
2-1-3 空隙分數 11
2-2歐姆定律、電流密度、導電度與電流效率………… 12
2-2-1 歐姆定律 12
2-2-2 電流密度 12
2-2-3 導電度 13
2-2-4 電流效率 13
2-3狀態方程式…………………………………………… 14
2-4電位之關係式………………………………………… 14
2-5電流之關係式………………………………………… 15
2-6導電度與濃度之關係………………………………… 16
2-7柏努力定律…………………………………………… 17
第三章、實驗裝置及實驗步驟 19
3-1實驗設備……………………………………………… 19
3-1-1模具…………………………………………… 19
3-1-2流量計與流量積算指示器…………………… 19
3-1-3電源供應器…………………………………… 20
3-1-4 CCD、高倍率鏡頭…………………………… 20
3-1-5 沉水馬達與攪拌器…………………………… 21
3-2實驗材料……………………………………………… 21
3-2-1 實驗試片……………………………………… 21
3-2-2 電解液………………………………………… 22
3-3攝影與影像擷取處理系統…………………………… 23
3-3-1影像拍攝器材與技巧………………………… 23
3-3-2 影像處理系統………………………………… 23
3-4實驗步驟與注意事項………………………………… 24
3-4-1 實驗步驟……………………………………… 24
3-4-2 注意事項……………………………………… 25
第四章、結果與討論………………………………………………… 26
4-1不同脈衝頻率下，氣泡層厚度之分析……………… 27
4-2相同脈衝頻率下，氣泡層的厚度分析……………… 29
4-3變更刀具形狀，氣泡層的厚度分析………………… 31
4-4 結果…………………………………………………… 32
第五章、結論………………………………………………………… 33
第六章、參考文獻…………………………………………………… 35
表……………………………………………………………………… 42
圖……………………………………………………………………… 48
附錄
A 次損失之係數〈K〉……………………………………………. 66
B Similarity Theory…………………………………………… 67

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指導教授

洪勵吾(Lih-Wu Hourng)

審核日期

2002-7-14

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