Machining Phenomena in EDM of Insulating Ceramics. Effect of Condenser Electrical Discharge.
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- SHIN Taemin
- 韓国慶尚大学校 豊田工業大学
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- YAMADA Hisashi
- 豊田工業大学
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- MOHRI Naotake
- 豊田工業大学
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- FURUTANI Katsushi
- 豊田工業大学
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- FUKUZAWA Yasushi
- 長岡技術科学大学
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- TANI Takayuki
- 筑波技術短期大学
Bibliographic Information
- Other Title
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- 絶縁性セラミックスの放電加工における加工現象 コンデンサ放電の効果
- ゼツエンセイ セラミックス ノ ホウデン カコウ ニ オケル カコウ ゲンショ
- Effect of Condenser Electrical Discharge
- コンデンサ放電の効果
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Abstract
Because of the high resistivity of insulating ceramics, there are some differences compared with the EDM of metallic materials. The secondary metal as an assisting electrode and a minus polarity of the electrode overcame the difficulties of machining for insulating ceramics. And the insertion of a condenser between the electrode and the workpiece improves the removal rate and the stability in electrical discharge machining for insulating ceramics. But there is no distinct explanation of the mechanisms. In this paper, we certified the mechanism and the effects of the condenser EDM for insulating ceramics as Si3N4, Sialon and SiC.<br>There are two types of the electrical discharge waveforms in the condenser EDM of insulating ceramics. A high electrical resistance of the surface causes a discharge with longer pulse duration than the settled value of discharge duration, which produces a lot of carbon from the working oil by heating. The low electrical resistance generates short discharge pulses which waste the carbon gradually. These waveforms are affected by a discharge-detection voltage, an equivalent resistance of ceramics' surface, and electrical parameters of discharge circuits. An adequate balance of a long pulse and short pulses makes it possible to machine insulating ceramics with high removal rate and high stability.
Journal
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- Journal of The Japan Society of Electrical Machining Engineers
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Journal of The Japan Society of Electrical Machining Engineers 32 (70), 1-7, 1998
Japan Society of Electrical Machining Engineers
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Details 詳細情報について
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- CRID
- 1390001206234121216
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- NII Article ID
- 10002439803
- 130003707633
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- NII Book ID
- AN00151681
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- ISSN
- 18810888
- 0387754X
- http://id.crossref.org/issn/0387754X
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- NDL BIB ID
- 4535978
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed