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 the Electrical Discharge Machining Tap by using Cu Electrodes of the Cold-Work Tool Steel

냉간 금형용 공구강의 Cu 전극을 이용한 방전 탭에 관한 연구

  • Lee, Eun-Ju (Changwon Campus of KOREA POLYTECHNIC.) ;
  • Park, In-Soo (Changwon Campus of KOREA POLYTECHNIC.) ;
  • Kim, Hu-Kwon (Ssangyong Motor Company Machining Team) ;
  • Wang, Duck-Hyun (School of Mechanical Engineering, Kyungnam University) ;
  • Chung, Han-Shik (Department of Energy and Mechanical Engineering, Institute of Marine Industry, Gyeongsang National University) ;
  • Lee, Kwang-Sung (Department of Energy and Mechanical Engineering, Institute of Marine Industry, Gyeongsang National University)
  • 이은주 (한국폴리텍대학 창원캠퍼스) ;
  • 박인수 (한국폴리텍대학 창원캠퍼스) ;
  • 김후권 (쌍용자동차) ;
  • 왕덕현 (경남대학교 기계공학과) ;
  • 정한식 (경상대학교 에너지기계공학과, 해양산업연구소) ;
  • 이광성 (경상대학교 에너지기계공학과, 해양산업연구소)
  • Received : 2016.08.02
  • Accepted : 2016.08.25
  • Published : 2016.10.31
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Abstract

Currently, an EDM tapping procedure has comprised some parts of the engraving discharge process for the press die. Usually, tapping has been used in cases where we are unable to mechanically machine using steelwork processes due to an increase in the hardness of a material after heat treatment in relation to a design change or missing process. Here, we analyze the influence of discharge tap shape on discharge time, discharge current, and the number of repetition conditions when a cold-work tool steel (STD11) has been treated with a discharge tapped by a screw-shaped cu electrode. The most important influence on processing condition has been determined to be the number of discharge repetitions. As this number increases, the angle reduction of a thread closes to an angle of the electrode via a power generation reduction. The optimal combination of conditions has been determined to be three discharge repetitions, $180{\mu}s$ of discharge time (same as existing regulations), and 25.4A of peak current. A 0.2749db advantage has emerged after comparing between this combination of optimal conditions and the SN rate of existing regulations.

Keywords

References

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  1. Electron Discharge Machining (EDM) and Hole EDM of Cold Heat-treated Tool Steel Molds (STD11) by using Cu Electrodes vol.17, pp.4, 2018, https://doi.org/10.14775/ksmpe.2018.17.4.076