Billet for molding aluminum

摘要

An aluminum billet which can discharge air in an air pocket formed in the container near its front end to the rear of the container, and a method of manufacturing such a billet. The billet has on its outer periphery grooves extending continuously from one to the other end thereof. Such a billet is manufactured using a continuous casting machine having a casting die having on its inner surface a plurality of ribs for forming the grooves in the outer periphery of the billet. Such a billet may also be manufactured by providing on an anvil of a press a billet guide means and a die having on its inner surface convex blades, and pushing a billet through the guide means and then through the die.