Gm Global Technolgoy Operations, Inc.

Allen T Birschbach

David Douglas Goettsch

Barry L Priem

Mark Eugene Hoover

Edward C Wall

Kenneth George Stahl, Jr

Kyle W Lehrmann

A method for casting metal using a semi-permanent mold connected to a feed portion includes forming a coolant jacket in a sprue of the feed portion. A coolant source is connected to the coolant jacket. A metal in a molten state is poured into the feed portion for gravity induced flow into the semi-permanent mold. A wall thickness of the sprue is predetermining which minimizes heat transfer from the sprue, thereby forcing the metal in the molten state to cool slower in the sprue than in the mold. After a predetermined time for the metal to cool to a solid state in the mold, flow of a coolant from the coolant source into the coolant jacket is initiated to cool the metal in the sprue before opening the mold.

Method for the semi-permanent mold casting process

A method for preparing engine block cylinder bore liners is disclosed, the method including preconditioning of the cylinder bore liners for use in sand casting of engine cylinder blocks, wherein an efficiency of the preconditioning process is maximized, a metal pour temperature is minimized, and material properties of the casting are optimized.

Method for preparing engine block cylinder bore liners

Growing community of inventors

Chesaning, MI, United States of America

Allen T Birschbach