陶瓷、玻璃和鑽石膜等硬脆材料因為具備優越之物理、化學、電氣和機械性質，使其在高科技產業中相當受到重視。雖然電化學放電加工法可加工上述材料，但其加工機制尚有很多不明確之處。故本實驗以自行研製之高精度靜態電蝕試驗機，以氫氧化鉀水溶液為電解液，且以供應電壓、供應電流和加工間隙為參數來探討鋼球對玻璃試片之靜態電化學放電加工機制。
由玻璃試片的加工表面之SEM觀察結果和電流波形變化，可清楚推論出完整之靜態電化學放電加工機制。此外，供應電壓為玻璃試片損傷之主要因素，增大供應電壓時甚至可使玻璃脆裂。而供應電流為絕緣狀態的主要因素，亦即增大供應電流時會使正負極間更快達到絕緣狀態。在供應電壓50V，供應電流8A，不同加工間隙條件下，可發現加工過程中皆有特定之放電間隙，此間隙約為49μm。依此加工間隙而將加工模式分為兩種。亦即，當間隙為0~49μm時，加工模式係由環狀至圓孔狀；而當間隙介於49~70μm時，則加工模式為圓孔狀。

Because of the exceptional physical, chemical, electric and mechanical properties of hard and brittle materials, such as ceramics, glass and diamond film etc, those are considerably valued in high technology industry. Although those materials can be machined using the ECDM method, its machining mechanism is still indeterminate. In this study, a static electrical pitting tester is employed, the electrolyte is KOH(eq), the workpiece is glass, and we change the parameters, such as supply voltage, supply current and machining gap to investigate the mechanism of static Electrochemical Discharge Machining.
From the experimental results, which are SEM pictures of machined glass and variations of current, we can clearly infer the mechanism of static-ECDM. Moreover, the most important reason for damaging glass is supply voltage. Even increasing supply voltage can make glass cleave. And the main factor to make the loop become insulating is supply current. While the supply voltage is 50V, the supply current is 8A, and in different machining gap condition, the results show that it has a certainly gap to discharge during the machining process, and the particular gap is about 49μm. The results also show that the machining model has two kinds of types. When the machining gap is shorter than 49μm, the machining model is from ring to circle; contrarily, when it is longer than 49μm, the machining model is circle directly.

總 目 錄

總目錄 I
圖目錄 III
表目錄 VI
中文摘要 VII
英文摘要 VIII
第一章 緒論 1
1-1 研究動機 1
1-2 相關文獻 3
1-3 本文重點 11
第二章 基本原理 12
2-1 放電加工基本原理 12
2-2 電化學放電加工基本原理 16
2-2-1 電化學反應 16
2-2-2 放電加工反應 17
2-3 電化學加工與放電加工之比較 19
第三章 實驗設備與實驗方法 20
3-1　實驗設備 20
3-1-1 次微米級精度靜態電蝕試驗機 20
3-1-2 訊號量測設備與資料蒐集系統 24
3-2 實驗試片之材料特性與幾何形狀 29
3-2-1 試片之材料特性與幾何形狀 29
3-2-2 電解液、輔助電極與加工槽 31
3-3 試片處理 36
3-3-1 鋼球試片 36
3-3-2 玻璃試片 36
3-4 實驗條件設定 37
3-5 實驗步驟 38
3-5-1 KOH水溶液之調配 38
3-5-2 試片間接觸與非接觸之判斷 38
3-5-3 間隙之調整 39
第四章 結果與討論 46
4-1 臨界電壓與臨界電流 46
4-2 電化學放電加工機制之建立 51
4-3 電氣參數效應 71
4-3-1 電壓效應 73
4-3-2 電流效應 78
4-4 間隙效應 83
4-5 實際放電間隙 93
第五章　結論 99
參考文獻 101

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