Expendable core for casting processes

Details Expendable core for casting processes Expendable core for casting processes

1993-01-28

1994-06-14

Lieberman, Paul

Metal founding

Process

Shaping a forming surface

164 14, 164132, 164369, 164522, 164525, 164528, 106 384, 106 3851, 106125, 106137, B22C 910, B22C 912, B22C 120

Patent

active

053201574

ABSTRACT:
A method is provided for forming a sand core which is suitable for use in casting processes, and in particular squeeze casting processes, to form internal features and intricate external features of a cast article. The core forming method involves the use of a single-component gelatin binder whose degradation at elevated temperatures is catalyzed by additions of a ferric compound. The gelating binder is a mixture of proteins derived from amino acids such as glycine, alanine, L-glutamic acid, L-aspartic acid, and/or small percentages of others, such that the gelatin binder is water soluble and therefore easily eliminated from the core sand at the end of the casting process. Due in particular to the presence of the ferric compound, the gelatin binder readily degrades at low temperatures, such as those associated with aluminum casting processes, such that the core degrades sufficiently to permit the sand to freely flow from the cast article without the need for core removal operations. Finally, the gelatin-based binder is nontoxic, such that its elimination from the sand to reclaim the sand for reuse does not pose an environmental hazard.

REFERENCES:
patent: 2206369 (1940-07-01), Salzberg
patent: 2684344 (1954-07-01), Phillips
patent: 2974048 (1961-03-01), Sietsema
patent: 2974050 (1961-03-01), Barlow
patent: 3166808 (1965-01-01), Moore
patent: 3212145 (1965-10-01), Green
patent: 3285756 (1966-11-01), Moren
patent: 3523094 (1970-08-01), Roberts et al.
patent: 4098859 (1978-07-01), Cummisford et al.
patent: 4500453 (1985-02-01), Shank
patent: 4711669 (1987-12-01), Paul et al.
patent: 4814012 (1989-03-01), Paul et al.
Avallone et al., "Marks' Standard Handbook for Mechanical Engineers"; 9th Edition (1987) p. 13-6.

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