Sand mold member and method
First Claim
1. A mass of foundry sand suitable for forming a sand mold member comprising a mass of sand particles each coated with a film of binder consisting essentially of collagen-derived gelatins selected from the group consisting of gelatins having a Bloom rating less than 175 Bloom grams for migration to the contact points between contiguous sand particles during heating of the core prior to drying of the core.
13 Assignments
0 Petitions
Accused Products
Abstract
A foundry mold member made from a plurality of sand particles bound together with a binder which is concentrated at the contact points between contiguous sand particles and consists essentially of gelatins having a Bloom rating less than about 175 Bloom grams. The sand particles are first coated with a sol of the gelatin, cooled to ambient temperature and conditioned to a prescribed water content necessary to effect migration of the gelatin to the interparticle contact points upon heating of the coated particles in a pattern mold.
28 Citations
5 Claims
- 1. A mass of foundry sand suitable for forming a sand mold member comprising a mass of sand particles each coated with a film of binder consisting essentially of collagen-derived gelatins selected from the group consisting of gelatins having a Bloom rating less than 175 Bloom grams for migration to the contact points between contiguous sand particles during heating of the core prior to drying of the core.
- 4. A mass of mold-making sand comprising a plurality of sand particles each having a coating thereon consisting essentially of collagen-derived gelatins having a Bloom rating of less than about 175 Bloom grams for migration to the contact points between contiguous sand particles during heating of the core prior to drying of the core, and wherein the coating comprises about 0.5% by weight to about 2.0% by weight of the coated sand.
Specification
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- Resources
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Current AssigneeGM Global Technology Operations LLC (General Motors Company)
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Original AssigneeGeneral Motors Corporation (Motors Liquidation Co. GUC Trust)
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InventorsSchreck, Richard Michael, Siak, June-Sang, Whited, William Thomas, Datte, Mark Allen
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Primary Examiner(s)Le, H. Thi
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Application NumberUS08/666,178Time in Patent Office881 DaysField of Search428/403, 428/407, 428/404US Class Current428/404CPC Class CodesB22C 1/2293 Natural polymers B22C1/24, ...Y10T 428/2993 Silicic or refractory mater...Y10T 428/2998 including synthetic resin o...
