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US 8,540,009 B2Granted
Hollow sand cores to reduce gas defects in castings
AssigneeGM Global Technology Operations LLC
InventorsMichael J. Walker, Thomas C. Pederson, Jason R. Traub, Anil K. Sachdev
Life of this patent
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Abstract
An exemplary method for forming a sand core includes forming a core insert; forming a sand core precursor around the core insert; and creating at least one passage within the sand core precursor by removing or otherwise transforming a portion of the core insert, wherein the at least one passage includes at least one exit point. The sand core may then be utilized in a casting mold assembly to form a cast part.
Claims19
A method comprising:
- forming a core insert with a plurality of spokes, wherein at least one of the plurality of spokes includes an end portion;
- forming a sand core precursor around the core insert;
- hardening the sand core precursor to form a sand core having an integral structure around the core insert;
- creating at least one passage within the hardened sand core by removing or otherwise transforming a portion of the core insert including transforming a portion of the plurality of spokes, wherein the at least one passage includes at least one exit point.
1 more element
A method comprising:
- introducing a mixture of sand and a resin into an interior portion of a core box system that includes a core insert with a plurality of spokes so that at least one gas release passage is formed within the mixture of sand and resin, the at least one gas release passage being defined by interior surfaces of the mixture of sand and resin and having at least one exit point from the mixture;
- curing the resin to solidify the mixture of sand and resin so that gas from the resin may escape through the at least one exit point of the at least one gas release passage and so that a sand core suitable for casting metal therein is provided.
A method comprising:
- determining a size and shape of a sand core that may be used to form a cast part in a sand mold;
- determining a size, shape and location of one or more internal passages including one or more exit points to be introduced within the sand core to provide a passageway for gases to escape during a subsequent casting process;
- and
- forming a plurality of core inserts that include spokes corresponding to the size and the shape of the one or more internal passages and having at least one end.
1 more element
A method comprising:
- determining a size and shape of a sand core that may be used to form a cast part a a sand mold;
- determining a size, shape and location of a plurality of internal passages including one or more exit points to be introduced within the sand core to provide a passageway for gases to escape during a subsequent casting process;
- and
- forming a plurality of core inserts that include spokes corresponding to the size and the shape of the one or more internal passages and having at least one end.
1 more element
Dependencies are inferred from the claim text.