Method of making a portion of an hollow, annular, sand-core

Details Method of making a portion of an hollow, annular, sand-core Method of making a portion of an hollow, annular, sand-core

1976-01-16

1976-12-21

Hoag, W. E.

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

264219, 264314, B29C 102

Patent

active

039989186

ABSTRACT:
Method of making an annular sand core portion by shaping sand and binder in an annular mold with an inflatable bladder. The bladder is inflatable and expandable to form and press sand core material between itself and the mold body while exerting uniform compressive force over the total surface area of the core material thereby forming a portion of a hollow core of precise external dimension and uniform overall strength.

REFERENCES:
patent: 2843893 (1958-07-01), Davis
patent: 3041685 (1962-07-01), Taccone
patent: 3606921 (1971-09-01), Grawey

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