Apparatus for compressing foundry moulding material by means of

Details Apparatus for compressing foundry moulding material by means of Apparatus for compressing foundry moulding material by means of

1988-01-20

1989-07-11

Seidel, Richard K.

Metal founding

Means to shape a forming surface

Including means for compacting particulate fluent mold...

164 37, B22C 1500

Patent

active

048462535

ABSTRACT:
An apparatus for the compression of foundry moulding material by compressed gas, which comprises a pressure tank for the compressed gas forming an inlet pressure zone, a moulding zone positioned beneath the same constituted by a moulding box with filling frame and pattern plate with pattern, onto which the moulding material is loosely poured prior to compression, and a large-area valve arranged between the pressure tank and the moulding zone. The closure member thereof frees the valve opening in the pressure tank in a few milliseconds and moves into the inlet pressure zone. The closure member is driven by a pressure cylinder, whose piston on the lift side forms the moveable termination of a gas-pressurized pressure reservoir and by its opposite side is connected to a high pressure source. The high pressure-side outflow is constructed in such a way that the pressure medium flows out at a speed of more than 10 m/s, accompanied by the simultaneous acceleration of the piston, under the pressure in the pressure reservoir and the closure member into the raised open position.

REFERENCES:
patent: 4144925 (1979-03-01), Wernli
patent: 4572274 (1986-02-01), Zimmermann

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