Hybrid cam bore sand core with metal chills for cast aluminum block
AssigneeGM Global Technology Operations LLC
InventorsRonald J. Petrus, Qigui Wang, Richard M. Nichols, III, Brian C. Leuenhagen
Life of this patent
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Abstract
A system for making a hybrid cam bore sand core with metal chills for an engine block includes an engine block cast of an aluminum material. A camshaft bore extends through the engine block. A cam bore sand core with at least one metal chill is positioned within the camshaft bore. A body portion of the at least one metal chill is positioned in direct contact with a cam bearing surface of at least one cam bearing member during casting of the engine block to increase a cooling rate of the at least one cam bearing member and create a crystalline material depth of the cam bearing member having enhanced mechanical properties.
Claims20
A hybrid cam bore sand core with metal chills system for an aluminum engine block, the system comprising:
- a camshaft bore extending through a to be cast aluminum engine block;
- a cam bore sand core with at least one metal chill positioned within the camshaft bore during casting of the aluminum engine block;
- and
- a body portion of the at least one metal chill positioned in direct contact with a cam bearing surface of at least one cam bearing member during casting of the aluminum engine block to increase a cooling rate of the at least one cam bearing member and create a crystalline material depth of the at least one cam bearing member.
A hybrid cam bore sand core with metal chills system for an aluminum engine block, the system comprising:
- a camshaft bore extending through a to be cast aluminum engine block;
- a cam bore sand core with a first metal chill and a second metal chill positioned within the camshaft bore during casting of the aluminum engine block;
- and
- a body portion of the first metal chill positioned in direct contact with a cam bearing surface of a first cam bearing member during casting of the aluminum engine block and a body portion of the second metal chill positioned in direct contact with a cam bearing surface of a second cam bearing member during casting of the aluminum engine block, the first metal chill and the second metal chill provided of a metal to increase a cooling rate of an aluminum material and create a crystalline material depth of the first cam bearing member and the second cam bearing member;
- and
- wherein the body portion of the first metal chill includes a first tapering surface and the body portion of the second metal chill includes a second tapering surface, the first tapering surface and the second tapering surface allowing sliding removal of the first metal chill in a first direction and sliding removal of the second metal chill in a second direction opposite to the first direction.
A method for making a cast aluminum engine block using a cam bore sand core with metal chills, comprising:
- preparing an engine block mold negative having a first sand core;
- positioning a second sand core with at least one metal chill within a camshaft bore of the first sand core;
- and
- casting an engine block from an aluminum material using the engine block mold negative having a body portion of the at least one metal chill in direct contact with a cam bearing surface of at least one cam bearing member during casting of the engine block to increase a cooling rate of the at least one cam bearing member and to create a crystalline material depth of the at least one cam bearing member.
Dependencies are inferred from the claim text.