Countergravity casting apparatus and method

Details Countergravity casting apparatus and method Countergravity casting apparatus and method

B - Operations, Transporting

22

D

B22D 18/06 (2006.01)

Patent

CA 2091659

A method for the countergravity casting of a melt involves placing a refractory mold in a vacuum chamber defined within a casting box where the mold may be optionally surrounded by support particulates in the vacuum chamber. The mold includes a mold cavity and a serpentine melt inlet passage formed by nested refractory members below the mold cavity and in melt flow communication therewith. The serpentine melt inlet passage is communicated with a fill tube extending from the casting chamber toward an underlying source of melt. The mold/chamber and the source are relatively moved to engage the fill tube and the source. A differential pressure is applied between the mold cavity and the source to urge the melt upwardly through the fill tube and serpentine melt inlet passage into the mold cavity. The mold/chamber and the source are then relatively moved to disengage the fill tube and the source after the mold cavity is filled with the melt. The mold/chamber as a unit is rotated in a direction that the serpentine melt inlet passage prevents runout of melt from the mold cavity until the mold/chamber are inverted.

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