Patent ID: 6684934
Filing Date: 2004-02-03
Classification: B22D

Abstract:
Method of countergravity casting a metallic material, comprising:a) melting the metallic material under subambient pressure in a melting vessel, b) providing a mold under subambient pressure on a mold base with a fill tube extending through an opening in said mold base, c) relatively moving said melting vessel and said mold base while providing subambient pressure about said melting vessel and said mold to immerse an opening of said fill tube in the melted metallic material in said melting vessel and to engage said melting vessel and said mold base with means for sealing therebetween and with the engaged mold base and melting vessel together enclosing a sealed gas pressurizable space that is located above the melted metallic material and below said mold base exteriorly of said fill tube and in communication with said melted metallic material such that gas pressure provided in said space is exerted on said melted metallic material, and d) gas pressurizing said space while subambient pressure is provided about said melting vessel and about and in said mold to establish a pressure on the melted metallic material to force it upwardly through said fill tube into said mold.