在工件表面的改性可以實現更高的性能，如耐磨性，增加機械強度和表面平整度，例如，在工件表面上塗覆一層碳化矽（SiC）將可增強耐磨性。而放電加工是表面改質的一種方法，大部分是在介電液裡添粉末，但是粉末放電會有團聚現象及沉澱於底部等問題，會使粉末失去功能，因此，近年開始有人使用矽油作為介電液，原因是矽油不會有粉末團聚或沉澱等問題產生，但矽油黏滯係數較高，容易導致加工時流動性不佳、不穩定、及產生加工屑的堆積現象。所以，本研究設計一個氣壓式往復機構，在加工過程中，氣壓缸會左右推動加工液，並藉由往復運動來增加循環及流動性，達到改善加工堆積的問題。另外，因電極的外形在進行放電時，對加工液的循環效果會有影響，因此，我們使用線切割將紅銅的圓棒電極切割成半圓形電極，然後寬度為棒狀電極直徑的0.5及0.6及0.7倍，並且透過旋轉進行放電加工，來探討半圓形電極的加工特性。
實驗結果顯示雖然往復機構可以增加流動性，但因為矽油黏度太高而材料移除率不高，且在加工過程會讓放電無法順利穩定進行。半圓形電極在加工時可以使介電液的循環較為順暢，加工的材料移除率也比一般電極高20倍，顯示半圓形旋轉電極對於高黏滯性的介電液會有很好的加工效果。

The modification of workpiece surface can achieve higher performances such as wear resistance, increase the mechanical strength, and surface flatness. For example, coating a layer of silicon carbide (sic) on the workpiece surface will enhance wear resistance. The electrical discharge machining is also one of surface modification method, most of the powder mixed in the dielectric liquid. However, the disadvantage of powder discharge will be the phenomenon of agglomeration, and sedimentation at the bottom issue to loss the powder function. Therefore, the solution of above mention issues is to use silicone oil as a dielectric liquid in recent years. The advantage of silicone oil as the liquid dielectric liquid will be no powder agglomeration or precipitation and other issues. But the side effect of silicone oil is higher viscosity coefficient resulting in poor mobility of liquidity, machining instability, and chips accumulation during processing. In this study, a pneumatic reciprocating mechanism was been designed, the pneumatic cylinder will push the dielectric liquid around in the process, and by reciprocating motion to increase the circulation and mobility, and to improve the processing of the accumulation of the problem. In addition, the circulation effect of the dielectric liquid is affected since the shape of the electrode is subjected to the discharge. Therefore, the workpiece of red copper rod electrode was cut into a semicircular electrode by wire cutting; and considering different width sizes of the bar electrode are 0.5, 0.6 and 0.7 times. Then, the semi-circular electrode processing characteristics are investigated through the rotation of the discharge processing.
The experimental results show that the reciprocating mechanism can obviously increase the mobility. However, some issues of EDM with rod electrode had happened which included lower material removal rate, and unstable discharging process due to higher silicone oil viscosity. In the other way, semi-circular electrode in the processing can make the dielectric liquid circulation is more smoothly, the processing of the material removal rate is also higher than the average electrode 20 times. The results showed the semi-circular rotary electrode for high viscosity dielectric fluid will be excellent to improve the machining performance.

目錄
中文摘要…………………………………………………………………………………….i
英文摘要………………………………………………………………………………ii
誌謝 iv
表目錄 vii
圖目錄 viii
符號說明 x
第一章 緒論 1
1.1 前言 1
1.2 研究動機與目的 2
1.3 文獻回顧 3
1.4 論文架構 6
第二章 放電加工基本原理 7
2.1 放電加工介紹 7
2.2 放電加工原理【9】 8
2.2.1. 陽極與陰極的能量分配比率因IP、τon而變化【9】 11
2.2.2. 熱傳導率性質與融點之積（λ˙θm）的大小 【9】 12
2.2.3. 介電液分解生成的碳對陽極部的附著與其保護作用的影響【9】 13
2.3 放電加工參數對放電其影響【9】 14
2.4 放電加工特性【7】 17
第三章 實驗設備與方法 18
3.1 實驗設備 18
3.2 實驗材料準備 27
3.3 矽油介電液加工原理. 33
3.4 實驗流程……………………………………………………………………33
第四章 結果與討論 36
4.1 使用往復機構對放電的影響 36
4.1.1 有無使用往復機構作來觀察材料移除率的差異性……………...…36
4.1.2 使用往復機構時對電極消耗率的差異性觀察…………………...…38
4.1.3 有無使用往復機構的放電波形圖…………………………………...39
4.2 使用往復機構探討電流對脈寬的響 40
4.2.1 探討在矽油放電時不同電流與脈寬的影響………..…..……..…….40
4.2.2 使用矽油介電液來觀察不同電流與脈寬的電極消耗率 41
4.2.3 在矽油放電下不同脈寬與電流對擴孔的影響……………….……..42
4.3 改善矽油放電的方法………….…………………………………….……43
4.3.1 提高轉速對材料移除率的影響...........................................................44
4.3.2 提高轉速對電極消耗率的影響…………………………………...…45
4.4 半圓形電極對放電的影響…………………………………………………46
4.4.1 半圓形電極與900轉一般電極的材料移除率……………………...46
4.4.2 提高半圓形電極的轉速並觀察對放電的影響…………….………..47
4.4.3不同寬度的半圓形電極對放電的影響…………………………………..48
4.5 不同條件下矽油放電的Z軸高度變化探討…………………………..…49
4.5.1 有無往復運動的Z軸的變化..………………………..……….……49
4.5.2 半圓形電極的Z軸高度變化………………………………………..50
第五章 結論 51
5.1 結論 51
5.2 未來展望 53
參考文獻 54
簡 歷 57

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