Casting method with a vacuum bonded dry sand core

Details Casting method with a vacuum bonded dry sand core Casting method with a vacuum bonded dry sand core

1974-03-04

1976-06-22

Baldwin, Robert D.

Metal founding

Process

Shaping a forming surface

164132, 164369, B22C 1522, B22D 2900

Patent

active

039645347

ABSTRACT:
A method for preparing sand cored parts is disclosed which is applicable to certain types of molding techniques where the mold cavity is at least slightly porous, such as shell molding, green sand molding, and most importantly, the cavityless method of molding. An impervious ply of highly formable consumable material, such as polyethylene plastic, is inserted or injected by blow molding to form an envelope conforming to the shape of the core box cavity. Unbonded sand is injected into the interior of the plastic ply to totally fill the same while being vibrated; the plastic envelope is then evacuated of air and sealed off to form a discrete package. The sand core, so packaged, is then removed from the core box and positioned within a molding cavity such as the cavity that might be formed in a consumable foam pattern or assembly whereby the complete cycle of casting may be carried out.

REFERENCES:
patent: 2517902 (1950-08-01), Luebkeman
patent: 3329996 (1967-07-01), Marcus et al.
patent: 3789907 (1974-02-01), Nakata et al.

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