Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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Improvement of the Quality of Cryogenic Machining by Stabilization of Liquid Nitrogen Jet Pressure

액체질소 분사 안정화를 통한 극저온가공 품질 향상

  • Gang, Myeong Gu (Department of Mechanical Engineering, Yonsei University) ;
  • Min, Byung-Kwon (Department of Mechanical Engineering, Yonsei University) ;
  • Kim, Tae-Gon (Manufacturing System Group, Korea Institute of Industrial Technology) ;
  • Lee, Seok-Woo (Manufacturing System Group, Korea Institute of Industrial Technology)
  • 강명구 (연세대학교 기계공학과) ;
  • 민병권 (연세대학교 기계공학과) ;
  • 김태곤 (한국생산기술연구원 생산시스템그룹) ;
  • 이석우 (한국생산기술연구원 생산시스템그룹)
  • Received : 2017.02.22
  • Accepted : 2017.03.21
  • Published : 2017.04.01
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Abstract

Titanium alloy has been widely used in the aerospace industry because of its high strength and good corrosion resistance. During cutting, the low thermal conductivity and high chemical reactivity of titanium generate a high cutting temperature and accelerates tool wear. To improve cutting tool life, cryogenic machining by using a liquid nitrogen (LN2) jet is suggested. In cryogenic jet cooling, evaporation of LN2 in the tank and transfer tube could cause pressure fluctuation and change the cooling rate. In this work, cooling uniformity is investigated in terms of liquid nitrogen jet pressure in cryogenic jet cooling during titanium alloy turning. Fluctuation of jet spraying pressure causes tool temperature to fluctuate. It is possible to suppress the fluctuation of the jet pressure and improve cooling by using a phase separator. Measuring tool temperature shows that consistent LN2 jet pressure improves cryogenic cooling uniformity.

Keywords

References

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