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姓名	王威凱(Wei-kai Wang)  查詢紙本館藏	畢業系所	機械工程學系
論文名稱	電化學放電加工中氣膜成長與加工精度之探討 (The Investigation of Gas Film and Machining Precision in the Electrochemical Discharge Machining)
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摘要(中)	電化學放電加工(ECDM)是加工非導電材料的新興加工技術，具有殘留熱應力低、加工精度高、加工速率快以及電極磨耗低等優點。因過去的文獻較少在探討加工機制對於加工結果的影響，故本文主要在探討電極尖端之氣膜半徑對於加工結果的影響，以及如何去控制電極尖端之氣膜半徑大小。 本文研究中使用直徑100m之碳化鎢刀具作為工具電極，電解液採用添加乙醇(Ethanol)之氫氧化鉀(KOH)溶液，利用電化學放電加工對石英玻璃進行鑽孔加工，再使用高速攝影機去拍攝加工過程中電極之氣膜成長情形，分別使用不同電壓、頻率以及有無添加磁場等參數，以研究及分析電極之氣膜厚度以及微孔加工的影響。 實驗結果顯示，電極尖端加工電壓在40V時有最大之氣膜半徑，從40V開始，隨著電壓增加，氣膜半徑隨之變小。改變頻率觀察氣膜成長情形而發現頻率與氣膜半徑成反比。添加磁場可以減小微孔之過切量、錐度並提高微孔之真圓度。
摘要(英)	Electrochemical discharge machining (ECDM) is one of the novel technologies applied on machining non-conductive materials. ECDM has serveral advantages, such as low residual stress on the surface, high quality, high machining rate and low tool electrode wear.Since previous references discussed about little the effects of machining mechanism, on the machining result so this thesis emphasizes how to control the radius of gas film formed on the tip of electrode. In this thesis Tungsten Carbide knife with diameter of 100m is used as the electrode, and KOH added Ethanol as electrolyte, to drill the quartz glass by electrochemical discharge machining. High speed camera is used to record the gas film under different supply voltages, frequencies, and magnetic field etc. The effects of gas film of thickness on the micro hole machining is analyzed. Experimental results show that gas film on the tip of electrode has the biggest radius as the supplied voltage is 40V. By increasing the supplied voltage, the gas film’s radius becomes smaller. The applied frequency and gas film’s radius are inversely proportional. Adding a proper magnetic field can decrease the overcut, taper, and enhance the roundness of micro hole.
關鍵字(中)	★ 電化學放電加工 ★ 石英玻璃 ★ 氣膜	關鍵字(英)	★ ECDM ★ Quartz glass ★ gas film
論文目次	摘要 I Abstract II 目錄 III 表目錄 IV 圖目錄 V 符號說明 VII 第一章 緒論 1 1-1 前言 1 1-2 石英加工簡介 1 1-3 電化學放電加工簡介 3 1-4文獻回顧 4 1-4-1 電化學放電加工機制 5 1-4-2 電化學放電加工製程 9 1-5 研究目的與動機 10 第二章 基本原理 12 2-1 電化學放電加工原理 12 2-2 火花形成機制 13 2-3 電化學放電反應式 15 2-4電解液導電度 17 2-5 接觸角與濕潤性 18 2-6勞侖茲力 19 第三章 實驗設備方法與步驟 21 3-1實驗設備 21 3-1-1機台結構設計 21 3-1-2 刀具進給控制系統 22 3-1-3脈衝式直流電源供應系統 22 3-1-4導電夾具及環形磁鐵 23 3-1-5 示波器與電流探測棒 23 3-1-6高速攝影機、微距鏡頭及光源箱 24 3-2實驗材料 25 3-3實驗步驟及注意事項 27 3-3-1 實驗步驟 27 3-3-2 實驗量測及拍攝 29 3-3-3實驗注意事項 30 第四章 結果與討論 31 4-1電壓對於電極尖端之氣膜半徑的影響 35 4-2頻率對於電極尖端之氣膜半徑的影響 37 4-3磁場對微孔的影響 38 4-3-1 磁場對孔徑及氣膜半徑的影響 39 4-3-2 磁場對微孔之錐度的影響 40 第五章 結論與未來展望 43 5-1 結論 43 5-2 未來展望 44 參考文獻 45 附表 52 附圖 53
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指導教授	洪勵吾	審核日期	2014-7-10
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