Abstract
The Effects of the coat permeability and the casting design on the mold filling of the molten aluminum alloy in the expendable pattern casting (EPC) process were investigated experimentally. An aluminum alloy plate was cast by the EPC process, and the filling time of the molten metal was measured. The use of a high permeability coat or the application of the reduced pressure condition led to a larger melt velocity. The melt velocity does not increase in proportion to the coat permeability. The experimental values of the filling time of molten metal were compared with the calculated values based on the mold filling model by the previous study, and were in relatively good agreement with the calculated values except for the case in which the coat permeability is very small. The filling time in case of the top pouring almost same value as that in case of the bottom pouring, except for the case in which the coat permeability is very small. The melt velocity in case of the top pouring is not lowered, even if the coat permeability is small.
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