임펠러 블레이드용 다이캐스팅 금형의 게이트 방안 설계

Gate Design to Reduce Porosity in High Pressure Die Cast Impeller Blade

  • 정순규 (한국기계연구원 부설 재료연구소) ;
  • 추인호 (마그마 엔지니어링 코리아) ;
  • 이정환 (한국기계연구원 부설 재료연구소) ;
  • 김대용 (한국기계연구원 부설 재료연구소)
  • 발행 : 2009.05.07

초록

In the effort on cost reduction in marine equipment company, the medium sized impeller blade ($500mm{\times}200mm{\times}20mm$) of an axial flow pan was manufactured by the high pressure die casting, with which was replaced the gravity die casting. High pressure die casting is a practical alternative because of some advantages such as excellent accuracy and smooth cast surface as well as cost reduction if a certain amount of porosity in the parts can be minimized. In order to reduce the porosity in the center of the neck which is thickest region of the impeller blade, the several gate designs were proposed in this work. The flow simulations for each gate design were performed and then the optimal design was determined by considering the air pressure distribution in neck section. Finally, the size of porosity in the neck of the die cast impeller blade for optimal design was less than 1mm, which satisfied the requirement.

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