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pISSN : 1598-706X / eISSN : 2288-8381


(논문)연구논문

한국주조공학회지 (22권3호 137-143)

Investigation on Characteristics of Various Mold Packing Materials in Lost Foam Casting of Aluminum Alloy

알루미늄 합금 소실모형주조 시의 주형충전재에 따른 특성변화

Ki-Young Klm, Kyung-Whoan Lee*, Kyung-Hwa Rim

Korea University of Technology and Education, *Korea Institute of Industrial Technology

Abstract

Silica sand, zircon sand, and steel shots were used as mold packing materials in lost foam casting of the aluminum alloy bar. Vibration acceleration in three directions and temperatures in the casting and mold were measured, and packing and cooling characteristics of these materials were investigated.Packing densities increased with increase in vibration magnitude and time, and were 1.41 ~ 1 .49 g/cmz for silica sand, 2.54~2.86g/cm: for zircon sand, and 3.92~4.52 g/cmz for steel shots. Sound castings were obtained only without evacuation of the flask during pouring. Solidification time became faster in order of silica sand, zircon sand and steel shot packing because steel shot has the highest cooling capacity of them. Solidification time of steel shot packing was shortened to about 1/2 of silica sand packing. Cooling capacity of sand mold was generally evaluated by heat diffusivity ofthe mold, however could be simply evaluated with specific heat per unit volume ofthe packing material in lost foam casting.

Keywords

packing material, packing density, cooling capacity