Apparatus for the production of foundry sand molds

Details Apparatus for the production of foundry sand molds Apparatus for the production of foundry sand molds

1978-12-21

1980-11-04

Baldwin, Robert D.

Metal founding

Means to shape a forming surface

Including means applying vacuum directly to mold material

164183, 164192, 164200, 164202, B22C 1522, B22C 1526, B22C 1708

Patent

active

042314151

ABSTRACT:
A dosed amount of molding sand is placed in a vessel arranged at a given distance from a pattern device from which a mold is to be formed, and a pressurized force is applied against the molding sand in the vessel from the side thereof remote from the pattern device in order thereby to impart to the molding sand an acceleration in the direction of the pattern device to compress the sand about the pattern device with the velocity of the accelerated molding sand being braked by impact with the pattern device and also by impact partially with a molding box within which the pattern device is contained. The vessel containing the molding sand is connected to a pressure source by a valve device which controls the application of pressure to the molding sand. Additionally a vacuum device is utilized to apply suction tending to compact the sand within the vessel to produce a more cohesive mass. After the vessel and the pattern device are moved into operative position, and the suction has been terminated, the valve may be opened to apply a pressurized force propelling the sand from the vessel against the pattern device.

REFERENCES:
patent: 1594598 (1926-08-01), Campbell
patent: 3659642 (1972-05-01), Vasilovsky et al.
patent: 3807483 (1974-04-01), Buhler

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