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High Frequency Micro Wire EDM for Electrolytic Corrosion Prevention

Authors
Chung, Do KwanShin, Hong ShikKim, Bo HyunChu, Chong Nam
Issue Date
Dec-2011
Publisher
KOREAN SOC PRECISION ENG
Keywords
Micro wire EDM; Electrolytic corrosion; High frequency AC power source
Citation
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING, v.12, no.6, pp.1125 - 1128
Journal Title
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING
Volume
12
Number
6
Start Page
1125
End Page
1128
URI
http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/13523
DOI
10.1007/s12541-011-0150-4
ISSN
1229-8557
Abstract
Electrolytic corrosion occurs if water is used as a dielectric fluid during micro EDM process, ultimately resulting in serious inaccuracies on a machined part. In order to prevent electrolytic corrosion, a high frequency AC power source was developed for micro wire EDM processes. This study presents an analysis based on the electrical double layer theory. Based on this theory, the effects of electrolytic corrosion decrease as the AC power source frequency increases. As an anti-corrosion power source, a 13.56 MHz AC power source was developed using class E power amplifier. This new power source produced discharge current pulses with a peak of 1.1 A and a duration of 20 ns. With the new power source, micro shafts were successfully machined by micro wire EDM using tap water without exhibiting electrolytic corrosion. In comparison to a conventional RC type power source, the high frequency AC power source with tap water ensured 7 times higher material removal rate while maintaining similar surface roughness (< 0.1 mu m R(a)).
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