公开(公告)号：US10682695B2

公开(公告)日：2020-06-16

申请号：US15972503

申请日：2018-05-07

Applicant: GM Global Technology Operations LLC

Inventor： David D. Goettsch ,  Allen Birschbach ,  Mark Eugene Hoover ,  Kyle W. Lehrmann

IPC: B22D27/04 ,  B22C9/06 ,  B22C9/08

Abstract: 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.

公开(公告)号：US20190337049A1

公开(公告)日：2019-11-07

申请号：US15972503

申请日：2018-05-07

Applicant: GM Global Technology Operations LLC

Inventor： David D. Goettsch ,  Allen Birschbach ,  Mark Eugene Hoover ,  Kyle W. Lehrmann

IPC: B22D27/04 ,  B22C9/08 ,  B22C9/06

Abstract: 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.