Patent ID: 6179042
Filing Date: 2001-01-30
Classification: B22D

Abstract:
In a continuous casting apparatus wherein an improved cylindrical bottom block for casting of large ingots or billets, particularly cylindrical shaped ingots, of light metals, such as aluminum and aluminum alloys, said cylindrical bottom comprising:(a) a base section having an outer diameter;(b) a centrally located circular surface forming the upper end of said base section, said circular surface positioned substantially perpendicular to the direction of casting, said circular surface forming the floor of the dish of the cylindrical bottom block which receives and cools liquid phase metal to form the butt end of an ingot, said circular surface being substantially flat and having a peripheral edge;(c) a cylindrical rim extending around said peripheral edge of said centrally located circular surface, said rim having an upper section and an inner side wall which forms the side wall of said dish;(d) a concave transition section positioned between said peripheral edge and the lower end of said inner side wall, said concave transition section extending completely around said peripheral edge;(e) a convex transition section between said upper section of said rim and the upper end of said inner side wall, said convex transition section extending completely around said dish;(f) said inner side wall having a flat central surface extending completely around said dish and defining the inner diameter of said dish; and(g) said upper section of said rim having an upper edge extending around said dish.