Proceedings of the Korean Society of Precision Engineering Conference (한국정밀공학회:학술대회논문집)

  • 2006.05a
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  • Pages.219-220
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  • 2006
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  • 2005-8446(pISSN)
Korean Society for Precision Engineering (한국정밀공학회)
권호 표지

The Surface Hardening Characteristics of Hot work Tool Steel by CW Nd:YAG Laser

CW Nd:YAG 레이저에 의한 열간금형 공구강의 표면경화특성

  • 신호준 (조선대 대학원 정밀기계공학과) ;
  • 유영태 (조선대 메카트로닉스공학과) ;
  • 안동규 (조선대 기계공학과) ;
  • 신병헌 (조선대 대학원 정밀기계공학과)
  • Published : 2006.05.01
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Abstract

Laser surface hardening technologies have been used to improve characteristics of wear and to enhance the fatigue resistance for mold parts. The objective of this research work is to investigate the influence of the process parameters, such as power of laser and defocused spot position, on the characteristics of laser surface hardening for the case of SKD61 steel. CW Nd:YAG laser is selected as the heat source. The optical lens with the elliptical profile is designed to obtain a wide surface hardening area with a uniform hardness. From the results of the experiments, it has been shown that the maximum hardness is approximatly 740 Hv when the power, focal position and the travel of laser are 1,095 W, +1mm and 0.3 m/min, respectively. In addition, the hardening width using the elliptical lens was three time larger than that using the defocusing of laser beam.

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