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The Effects of Vacuum-Molding Process Conditions on the Fluidity of A356 Alloy  

Oh, Young-Jin (Department of Materials Engineering, Chungbuk National University)
Kim, Eun-Sik (Department of Materials Engineering, Chungbuk National University)
Kim, Myung-Han (Department of Materials Engineering, Chungbuk National University)
Hong, Young-Myung (Korea Institute of Industrial Technology)
Publication Information
Journal of Korea Foundry Society / v.25, no.4, 2005 , pp. 173-178 More about this Journal
Abstract
The vacuum molding process is one of the clean-foundry molding-processes that can recycle molding sands repeatedly, because molding can be accomplished by introducing vacuum only among dry molding sands in flask. The effects of molding conditions such as sand grain fineness, vacuum pressure and coating thickness on the fluidity of A356 Al alloy were studied and the results was obtained that the fluidity length was decreased as the sand grain fineness number and coating thikness were decreased and the vacuum pressure was increased. A large amount of heat removal from the molten metal resulting from the vacuum suction during the vacuum molding process was the principal cause of this decrease in fluidity.
Keywords
Vacuum molding process; Fluidity; A356 alloy; Sand grain fineness; Vacuum pressure; Coating thickness;
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