Method for producing foundry shapes
OwnerVictor S. LaFay, Stephen L. Neltnerinventors
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Abstract
A method for producing silica sand-based foundry shapes useful informing metal castings and for reducing veining defects in sand-based foundry shapes by providing a foundry sand, adding an anti-veining composition that comprises bentonite to the foundry sand to form a mineral composition, then adding a foundry resin to the mineral composition to form a sand-based foundry composition and shaping the sand-based foundry composition to form a desired pattern.
Claims16
A method for producing foundry shapes by incorporating an anti-veining composition comprising bentonite and a silica sand-based foundry composition to reduce veining, said method comprising the steps of:
- providing a foundry sand, adding an anti-veining composition to the sand, and adding a foundry resin to form a sand-based foundry composition, and
- shaping the sand-based foundry composition to form a desired pattern, when the anti-veining composition comprises bentonite.
A method of making a metal casting from sand-based foundry compositions comprising the steps of:
- preparing a sand based foundry composition of silica sand, a foundry resin appropriate for sand molds, and an anti-veining material, wherein the anti-veining material is present in a concentration of from about 1 to about 10% based on sand and the anti-veining material comprises bentonite;
- shaping said sand-based foundry composition to form a sand mold or core having a desired pattern therein;
- and
- poring molten metal into the pattern formed in the sand-based foundry composition to produce the metal casting having little or no veining.
Dependencies are inferred from the claim text.