Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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A Study on Graphite Electrode Wear in Sink EDM of HP1MA Steel

HP1MA 강의 형조 방전가공에서 흑연 전극 마모에 관한 연구

  • Oh, Young-Jin (School of Mechanical and Airospace Engineering, Gyeongsang National University) ;
  • Jeong, Hyeon-Je (School of Mechanical and Airospace Engineering, Gyeongsang National University) ;
  • Kim, Su-Jin (School of Mechanical and Airospace Engineering, Gyeongsang National University)
  • 오영진 (경상대학교 기계항공공학부) ;
  • 정현제 (경상대학교 기계항공공학부) ;
  • 김수진 (경상대학교 기계항공공학부)
  • Received : 2020.01.31
  • Accepted : 2020.05.15
  • Published : 2020.08.31
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Abstract

In discharge machining, material is removed by electrical discharge between the electrode and the workpiece. An important consideration in EDM is that the wear of the electrodes decreases the final precision of the workpiece. The edge wear of the electrodes proceeds very quickly because sparks occur more frequently at the edges with high local electrical strength. In this study, mold steel was discharged with a wedge-shaped graphite electrode to measure the edge wear of the electrode according to the depth. The electrode edge wear increased with depth during EDM and a wear model was developed. The model predicted that the edge wear can be reduced by approximately 70% using two electrodes instead of a single electrode. The model was supported by the experimental comparison of the dual electrode method and the single electrode method.

Keywords

References

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