Vacuum lift foam filled casting system

摘要

A lost foam casting system (2) is provided with vacuum lift of molten metal (16) to an evaporative foam pattern assembly (8) surrounded by unbonded particulate media such as sand (6) in a flask (4). A gas permeable member (34, 70) or passage (72, 74) is provided between the sand and a vertical fill passage (20) to apply vacuum from the sand to the fill passage such that molten metal is vacuum lifted through the fill passage to the foam pattern assembly, such that the foam material vaporizes as the molten metal advances upward and is replaced by the metal in the shape of the pattern assembly.