Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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A Study on the Improvement of Tool's Life by Applying DLC Sacrificial Layer on Nitride Hard Coated Drill Tools

드릴공구의 이종질화막상 DLC 희생층 적용을 통한 공구 수명 개선 연구

  • Kang, Yong-Jin (Surface Technology Division, Korea Institute of Materials Science(KIMS)) ;
  • Kim, Do Hyun (Surface Technology Division, Korea Institute of Materials Science(KIMS)) ;
  • Jang, Young-Jun (Surface Technology Division, Korea Institute of Materials Science(KIMS)) ;
  • Kim, Jongkuk (Surface Technology Division, Korea Institute of Materials Science(KIMS))
  • 강용진 (한국재료연구원 표면재료연구본부 극한환경코팅연구실) ;
  • 김도현 (한국재료연구원 표면재료연구본부 극한환경코팅연구실) ;
  • 장영준 (한국재료연구원 표면재료연구본부 극한환경코팅연구실) ;
  • 김종국 (한국재료연구원 표면재료연구본부 극한환경코팅연구실)
  • Received : 2020.12.08
  • Accepted : 2020.12.22
  • Published : 2020.12.31
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Abstract

Non-ferrous metals, widely used in the mechanical industry, are difficult to machine, particularly by drilling and tapping. Since non-ferrous metals have a strong tendency to adhere to the cutting tool, the tool life is greatly deteriorated. Diamond-like carbon (DLC) is one of the promising candidates to improve the performance and life of cutting tool due to their low frictional property. In this study, a sacrificial DLC layer is applied on the hard nitride coated drill tool to improve the durability. The DLC coatings are fabricated by controlling the acceleration voltage of the linear ion source in the range of 0.6~1.8 kV. As a result, the optimized hardness(20 GPa) and wear resistance(1.4 x 10-8 ㎣/N·m) were obtained at the 1.4 kV. Then, the optimized DLC coating is applied as an sacrificial layer on the hard nitride coating to evaluate the performance and life of cutting tool. The Vickers hardness of the composite coatings were similar to those of the nitride coatings (AlCrN, AlTiSiN), but the friction coefficients were significantly reduced to 0.13 compared to 0.63 of nitride coatings. The drilling test were performed on S55C plate using a drilling machine at rotation speed of 2,500 rpm and penetration rate of 0.25 m/rev. The result showed that the wear width of the composite coated drills were 200 % lower than those of the AlCrN, AlTiSiN coated drills. In addition, the cutting forces of the composite coated drills were 13 and 15 % lower than that of AlCrN, AlTiSiN coated drills, respectively, as it reduced the aluminum clogging. Finally, the application of the DLC sacrificial layer prevents initial chipping through its low friction property and improves drilling quality with efficient chip removal.

Keywords

References

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