Casting sand cores and expansion control methods therefor
OwnerStephen G. Baker, Joshua M. Werlinginventors
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Abstract
Thermal expansion of sand cores and the formation of vein defects during metal casting operations can be substantially eliminated, with substantially reduced costs, by using an anti-veining material comprising less than about 4% by weight of a lithia-containing material, and at least about 1% by weight of ferric oxide (Fe2O3), said anti-veining material preferably comprising about 1% to about 3.5% by weight of a lithia-containing material and about 1% by weight of ferric oxide.
Claims15
A sand core for metal casting, comprising less than about 4% by weight of a lithia-containing material, at least about 1% by weight of ferric oxide, and the balance of core sand and a core sand binder, all formed into a sand core.
A mixture for forming a sand core, comprising about 1.5% to about 3.5% by weight of a lithia-containing material, at least about 1% by weight of ferric oxide, and the balance of core sand and a core sand binder.
A method of making a sand core for casting, comprising uniformly mixing together a core sand, an effective amount of binder, about 1% to about 3.5% by weight of a lithia-containing material, and about 1% by weight of ferric oxide as a core-forming material, and forming the core-forming material into a sand core.
A method of making a sand core for casting, comprising uniformly mixing together a core sand, an effective amount of core sand binder, an anti-veining material comprising less than about 4% by weight of a lithia-containing material and at least about 1% by weight of ferric oxide as a core-forming mixture and thereafter forming the core-forming mixture into a sand core.
Dependencies are inferred from the claim text.