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標題Title: Electrical Discharge Machining of PCD in ultrapure water
作者Authors: 朱沛妤
上傳單位Department: 機械工程系
上傳時間Date: 2016-6-13
上傳者Author: 朱沛妤
審核單位Department: 機械工程系
審核老師Teacher: 戴子堯
檔案類型Categories: 課堂報告In-class Report
關鍵詞Keyword: EDM, PCD, Ultrapure water, Electrochemical corrosion, Die-sinking EDM
摘要Abstract: Sintered polycrystalline diamond (PCD) has a high degree of hardness and wear resistance, therefore, it is expected for being used for micro
cutting or grinding tool. It is possible to shape the PCD micro tools with high accuracy by using electrical discharge machining (EDM) method.

However, the EDMing efficiency of PCD is low, therefore, it is necessary to improve the removal rate and the electrode wear ratio.
It is presumed that the EDM machinability is improved by EDMing in water.

However, it is anticipated that electrochemical corrosion on the PCD
surface is caused during EDMing in water. In this paper, the EDM machinability and the corrosion suppressing method in water are discussed.

It is confirmed that the removal rate and the electrode wear ratio are improved by EDMing PCD in water. Moreover, electrochemical corrosion
of cobalt can be suppressed by EDMing in ultrapure water with high resistivity (1.8×107 ȍڄcm). In addition, the electrochemical corrosion
affected area can be reduced by using thin flow of EDMing fluid.

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