Patent ID: 6454829
Filing Date: 2002-09-24
Classification: B22D,C21C,C22B

Abstract:
An apparatus for degassing a molten metal and casting a degassed molten metal, comprising:a first chamber receiving a flow of molten metal to be degassed and forming a first bath having an upper surface; a second chamber separable from said first chamber and forming a casting chamber having an outlet for discharging a casting flow of molten metal, said second chamber receiving a second bath of molten metal having an upper surface; a vacuum chamber located above said first and second chambers and having a riser tube connecting a bottom of said vacuum chamber with said first chamber and extending downwardly through said upper surface of said bath in said first chamber to open below said upper surface in said first chamber, a descending tube connecting a bottom of said vacuum chamber with said second chamber and extending downwardly through said upper surface of said bath in said second chamber to open below said upper surface in said second chamber, and means for applying suction to said vacuum chamber, whereby flow of said molten metal upwardly in said riser tube is effected solely by a pressure difference between said vacuum chamber and said upper surface of said first bath, said molten metal is degassed in said vacuum chamber and degassed molten metal flows from said vacuum chamber through said descending tube to said second bath; and means for directly heating said riser tube and said descending tube.