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Machining characteristics of micro EDM in water using high frequency bipolar pulse

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Abstract

Micro EDM using conventional pulse generators such as the RC type or transistor type with water as the dielectric fluid suffers from poor accuracy of machined structures due to electrolytic corrosion. In this study, a new high frequency bipolar pulse generator for micro EDM in water was developed in order to prevent electrolytic corrosion. The new pulse generator produced a high frequency bipolar pulse possessing a positive pulse duration of several hundred nanoseconds with a high repetition rate provided to the machining gap. Discharge characteristics of micro EDM using the new pulse generator were investigated. Machining characteristics were also investigated according to machining conditions such as the repetition rate, positive voltage, capacitance and resistivity. Using the new pulse generator, micro holes without electrolytic corrosion were successfully fabricated in deionized water and tap water. Machining time, tool wear and clearance using the new pulse generator in deionized water decreased compared with those using the RC circuit in kerosene.

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Authors and Affiliations

  1. School of Mechanical and Aerospace Engineering, Seoul National University, Gwanak 599 Gwanak-ro, Gwanak-gu, Seoul, Korea, 151-744

    Do Kwan Chung, Hong Shik Shin & Chong Nam Chu

  2. Department of Product Design and Manufacturing Eng., Seoul National University of Science and Technology, 172 Gongreung 2-dong, Nowon-gu, Seoul, Korea, 139-743

    Min Soo Park

Authors
  1. Do Kwan Chung
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  2. Hong Shik Shin
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  3. Min Soo Park
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  4. Chong Nam Chu
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Correspondence to Min Soo Park.

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Chung, D.K., Shin, H.S., Park, M.S. et al. Machining characteristics of micro EDM in water using high frequency bipolar pulse. Int. J. Precis. Eng. Manuf. 12, 195–201 (2011). https://doi.org/10.1007/s12541-011-0027-6

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  • DOI: https://doi.org/10.1007/s12541-011-0027-6

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