B - Operations – Transporting – 22 – D
Patent
B - Operations, Transporting
22
D
22/75
B22D 35/00 (2006.01) B22D 27/04 (2006.01)
Patent
CA 1095685
FLOATING HEAT INSULATING BAFFLE FOR DIRECTIONAL SOLIDIFICATION APPARATUS UTILIZING LIQUID COOLANT BATH ABSTRACT OF THE DISCLOSURE An improved casting apparatus for directionally solidifying molten metal is disclosed. The apparatus typically includes a furnace for heating a mold con- taining molten metal, a liquid metal coolant bath posi- tioned below the bottom of the furnace and means for gradually withdrawing the heated mold from the furnace into the coolant bath to effect directional solidifica- tion of the molten metal. The apparatus is improved by positioning a heat insulating baffle between the bottom of the furnace and coolant bath, the baffle being con- structed to float on the bath surface during the solidi- fication process and minimize heat loss from the mold until it is immersed in the bath. The provision of the floating baffle between the furnace bottom and coolant bath provides several important advantages including increased thermal gradients, shorter casting cycles and improved cast microstructures. In addition, the floating baffle reduces vaporization of the liquid metal coolant and maintains a smooth, ripple-free coolant surface. EH-6232b
299687
Swabey Ogilvy Renault
United Technologies Corporation
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