US 4,544,013 AGranted

Method of reclaiming sand used in evaporative casting process

AssigneeFord Motor Company

InventorsDolores C. Kearney, Peter Giza, Bruno Matz

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Abstract

The invention is a method of reclaiming sand used in a method of casting a metal having a liquidus temperature below 2000.degree. F., the casting method using a vaporizable pattern set within a mold constituted of unbonded sand. The method comprises: (a) blowing, after a predetermined lapse of time after the pouring of the metal into the mold, a combustion supporting gas into and through substantially the entire volume of the mold to levitate at least a region of the sand adjacent to the casting and to combust volatilized byproducts of the pattern entering the mold, and (b) continuing the blowing of the combustion supporting gas to continue combustion and driving of the gas and byproducts of the combustion out of the mold.

Claims7

Dependent claims

A method of reclaiming sand used in casting a metal having a liquidus temperature below 2000.degree. F., the casting method using a vaporizable pattern set within a mold constituted of unbonded sand, comprising:

(a) blowing, after a lapse of time of about 5-10 minutes after the pouring of molten metal into said mold to form a casting, a combustion supporting gas into and through said mold to fluidize at least the region of said sand adjacent to the casting in which the temperature ranges from 1400.degree.-800.degree. F. and thereby to utilize the radiant heat of said molten metal to combust volatilized byproducts of said pattern in said region of sand about the casting;
and
(b) continuing the blowing of said combustion supporting gas to continue combustion, additional volatilization of byproducts, and driving of said gas and products of combustion out of said mold.

Dependencies are inferred from the claim text.