鈦合金整流板電化學加工技術研發

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姓名

謝汎鈞(Fan-Chun Hsieh) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

鈦合金整流板電化學加工技術研發
(The technical development of Titanium alloy's plate screener using electrochemical machining)

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摘要(中)

利用電化學加工(ECM)方法製造鈦合金整流板，具有工具無耗損、工件表面無殘留應力等優點，但是如何設計工具形狀及工作參數方可將工件加工成所需之形狀卻是一件不易之工作;往往需不斷測試與修改，進而影響生產時間與效率。
本文將使用套裝軟體FORTRAN來建立一套電腦模式，利用有限差分法計算二維電場之分佈，並利用控制體積觀念來模擬熱流場之變化;以期能準確計算出工件形狀與預測出所需工具形狀。
由於電化學加工過程中，電解液的種類、濃度與溫度均對其導電度有很大的影響，而導電度會影響工件之去除率以及加工精度。故本文也以實驗來量測相同電解液(硝酸鈉)在不同的濃度與溫度下的導電度，亦將所得到的數據代入程式運算，使得數值模擬更準確。

摘要(英)

The project presents a numerical for predicting the anode shapes in the electrochemical machining with prescribed tool shape. The conductivity of, and the variation of electrolyte conductivity with temperature had been taken into account in numerical simulation. Results show that the accuracy of the predicted shape is improved.

關鍵字(中)

★ 電化學加工
★ 導電度
★ 鈦合金整流板
★ 硝酸鈉

關鍵字(英)

★ electrochemical machining
★ numerical simulation

論文目次

摘要...........................................Ⅰ
英文摘要.......................................Ⅱ
目錄...........................................Ⅲ
表目錄.........................................Ⅴ
圖目錄.........................................Ⅵ
符號說明.......................................Ⅷ
第一章緒論....................................1
1-1. 文獻回顧..................................2
1-2. 研究目的..................................4
1-2.1 數值模擬.................................5
1-2.2 實驗部分.................................5
第二章理論分析................................6
2-1. 電場分佈及加工間隙的變化..................6
2-1.1 電場之決定...............................6
2-1.2 運動關係式...............................7
2-1.3 電流密度與導電度.........................7
2-1.4 加工位置的形成...........................8
2-2. 二維單相熱流場分析........................8
2-2.1 流場之決定...............................8
2-2.2 流場之邊界條件...........................9
2-2.3 溫度場之決定............................10
2-2.4 溫度場之邊界條件........................11
第三章數值方法...............................12
3-1. 二維橢圓座標系統之轉換...................12
3-2. 二維電場之計算方法.......................17
3-3. 二維流場之計算方法.......................17
3-4. 二維單相流場數值計算流程.................20
3-5 完整的計算流程流..........................21
第四章結果與討論.............................22
第五章結論...................................26
第六章參考文獻...............................27

參考文獻

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指導教授

洪勵吾(Lih-Wu Hourng)

審核日期

2002-7-5

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