Production of cast pieces from a molten metal comprises forming a cast molded part, forming a molded part from the molding material, pouring the molten bath into the casting mold, cooling, removing the fragments of the mold part

摘要

Production of cast pieces from a molten metal comprises forming a cast molded part by mixing a flowable base material that is inert towards the molten bath and has a lower coefficient of expansion when heated than silica sand and a binder that has a different expansion behavior when heated than the molding material; forming a molded part from the molding material; assembling a casting mold using the mold parts; pouring the molten bath into the casting mold to form a casting; cooling the casting for a solidification and cooling interval in which the mold part automatically fragments; removing the fragments of the mold part from the casting; and processing the fragments of the molding material to a flowable base molding material. An Independent claim is also included for a molding material used in the process. Preferred Features: The cast molded part is sprayed with the binder before hardening. The binder is made from a water glass binding agent. The base molding material is made from mullite. The molten metal is made from aluminum.