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

  • 제17권4호
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  • Pages.76-82
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  • 2018
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  • 1598-6721(pISSN)
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  • 2288-0771(eISSN)
한국기계가공학회 (The Korean Society of Manufacturing Process Engineers)
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냉간 금형용 공구강의 Cu 전극을 이용한 방전 홀에 관한 연구

Electron Discharge Machining (EDM) and Hole EDM of Cold Heat-treated Tool Steel Molds (STD11) by using Cu Electrodes

  • 박인수 (한국폴리텍대학 창원캠퍼스) ;
  • 이은주 (한국폴리텍대학 창원캠퍼스) ;
  • 김화정 (한국폴리텍대학 창원캠퍼스) ;
  • 왕덕현 (경남대학교 기계공학부)
  • 투고 : 2018.03.28
  • 심사 : 2018.05.23
  • 발행 : 2018.08.31
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초록

3D formed Electrical Discharge Machining (EDM) and hole EDM were conducted for die and mold manufacturing with electrodes which were made by mechanical machining and wire EDM. It is difficult to machine the hardened material after heat treatment and quenching with traditional machining. The only method of machining hardened material is die-sinking EDM. In this research, hole EDM was conducted for heat-treated cold-worked tool steel (SKD11) for use as a die material. The EDM surfaces were analyzed by pulse-on time and peak current of EDM current, according to the machining conditions of EDM. The EDM surface profiles were affected by the peak current. The contribution of each factor is peak current (91.63%) and pulse-on time (0.93%). The best surface roughness was obtained with a $130{\mu}s$ pulse-on time and a 14.2 A peak current. With uniform EDM processing, the surface deteriorated with increasing pulse-on time and peak current. The thickness of the solidified layer induced by EDM was increased as the peak current, crater shapes, and erupted shapes of EDM surfaces were increased. Therefore, microcracking gaps induced by surface tension were increased.

키워드

참고문헌

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