Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Fabrication of Functionally Graded Materials Between P21 Tool Steel and Cu by Using Laser-Aided Layered Manufacturing

레이저 적층조형을 이용한 P21 툴 스틸과 Cu 간 기능성 경사 복합재의 제작

  • Jeong, Jong-Seol (Graduate School of NID Fusion Technology, Seoul Nat'l Univ. of Science and Technology) ;
  • Shin, Ki-Hoon (Dept. of Mechanical and Automotive Engineering, Seoul Nat'l Univ. of Science and Technology)
  • 정종설 (서울과학기술대학교 NID 융합기술전문대학원) ;
  • 신기훈 (서울과학기술대학교 기계자동차공학과)
  • Received : 2012.06.18
  • Accepted : 2012.08.20
  • Published : 2013.01.01
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Abstract

With the development of layered manufacturing, thermally conductive molds or molds embedding conformal cooling channels can be directly fabricated. Although P21 tool steel is widely used as a mold material because of its dimensional stability, it is not efficient for cooling molds owing to its low thermal conductivity. Hence, the use of functionally graded materials (FGMs) between P21 and Cu may circumvent a tradeoff between the strength and the heat transfer rate. As a preliminary study for the layered manufacturing of thermally conductive molds having FGM structures, one-dimensional P21-Cu FGMs were fabricated by using laser-aided direct metal tooling (DMT), and then, material properties such as the thermal conductivity and specific heat that are related to the heat transfer were measured and analyzed.

적층조형 방법의 개발로 열전도성 금형 혹은 형상적응형 냉각회로를 구비한 금형의 제작이 가능하게 되었다. 금형의 재질로 치수변화가 적은 P21 툴 스틸이 널리 사용되고 있지만, 열전도율이 낮기 때문에 냉각효율은 높지 않다. 이러한 점에서 열전달 효율을 극대화 시킬 수 있는 방법으로 P21 스틸과 구리(Cu)를 기능적으로 혼합한 기능성 경사 복합재(FGM)를 사용하는 방법이 검토되고 있다. 본 논문에서는 FGM 구조를 가지는 금형의 적층조형을 위한 예비연구로 P21-Cu 간의 1 차원 FGM 을 DMT 장비를 이용하여 제작하고, 열전달 관련 물성치를 평가하였다.

Keywords

References

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