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US 5,676,193 AGranted
Cast abrasion resistant hollow balls
AssigneeThe Babcock & Wilcox Company
InventorBryan Hand
Life of this patent
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Abstract
A cast abrasion resistant hollow ball is formed with a hollow ceramic core that generates no gas during the casting operation. Solid ceramic bars or supports hold the hollow ceramic core in a fixed location at the center of the cast ball during the casting process. There are no open holes or openings in the ceramic supports due to the fact that the hollow ceramic sphere is composed of an inert refractory material which eliminates any gases being generated during the pouring and solidification of the liquid metal in the casting process.
Claims7
A method for casting an abrasion resistant hollow ball, comprising the steps of:
- providing a hollow ceramic core;
- holding the hollow ceramic core in a fixed location in a cast mold cavity with at least one solid ceramic support attached to the hollow ceramic core;
- pouring liquid metal around the hollow ceramic core without generating any gas when the hollow ceramic core is surrounded by the liquid metal;
- allowing the liquid metal to solidify to form said hollow ball;
- and removing any portion of said support which is beyond an exterior surface of said hollow ball such that to form said hollow ball having at least a portion of said support situated therein extending outwardly from said ceramic core to said exterior surface of said hollow ball.
2 more elements
Dependencies are inferred from the claim text.