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- 저자 : 이진형 ( Man Jin Ha (검색결과 2 건)
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유도코일 형태가 용융주석의 자유표면 형상에 미치는 영향
하만진,이진형 ( Man Jin Ha,Zin Hyoung Lee ) 한국주조공학회 1994 한국주조공학회지 Vol.14 No.2
N/A Electromagnetic continuous casting(EMC) is a novel continuous casting technique which utilizes electromagnetic force to maintain the melt free surface in a desired shape. In this study the effect of electromagnetic field on the free surface shape of tin melt was investigated. Tin was used because it has the similar density and electroconductivity to steel. High frequency(2.5㎑) coil current was calculated with the measurement of the electromotive force in a solenoid probe. The effect of the electromagnetic field on the melt shape was numerically analysed. The predicted results were compared with experimental results under the variation of melt mass and coil current. The influence of the cross section shape and inner diameter of the coil was studied. It has been shown that the coil which has a tapered inner wall was more suitable for EMC than the coil with a rectangular cross section. The tapered inner wall plays a role of screen without power dissipation. The predicted free surface was in a good agreement with experimental results.
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하만진,이진형,이상수,은희준 ( Man Jin Ha,Zin Hyoung Lee,Sang Soo Lee,Hee Joon Eun ) 한국주조공학회 1994 한국주조공학회지 Vol.14 No.1
N/A The possibility of using bulk talc as molding material was reviewed and tested with the measurement of thermal properties and computer simulations. The measured thermal conductivity and heat diffusivity(kpc) of talc were 2.4W/m℃ and 6.6×10^6 J²/m⁴℃²s, respectively. Thermal properties of talc could be ranked between those of sand mold and iron mold. Talc transforms into cristobalite and enstatite at 910℃, During the transformation volume and structure change, cracks appear on the surface and distortion occurs. Therefore talc can be used for molding material below 910℃ if carefully treated. Computer simulation was carried out to test whether talc insert could promote directional solidification in sand mold and iron mold. In sand mold, it was possible to achieve directional solidification of thin plate casting with the length to thickness ratio of 15, if both iron insert and talc insert were used. In iron mold, it was possible to achieve directional solidification only with talc insert.
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