Apparatus for compacting molding sand using pressurized gas

Details Apparatus for compacting molding sand using pressurized gas Apparatus for compacting molding sand using pressurized gas

1984-05-29

1986-05-13

Godici, Nicholas P.

Metal founding

Means to shape a forming surface

Including means for compacting particulate fluent mold...

164 37, B22C 1500

Patent

active

045880174

ABSTRACT:
An apparatus for the compaction of foundry sand using a pressurized gas method is made up of a conventional flask closed by a pattern plate with a pattern and has a filling frame and a chamber over the foundry sand heaped on the pattern. A high-speed filling of the chamber is carried out by gas under pressure in a matter of milliseconds so that the foundry sand is compacted while at the same time the pressure falls. In order to be certain of an even and reproducible compacting effect on the sand whatever way of producing the gas pressure is used, i.e. with or without an explosion of a gas mixture to get a gas pressure wave, use is made of a piston plate that is placed a small distance over the surface of the sand filling for separating the sand from the gas pressure space at least at the beginning of the action of the gas, such piston plate being freely movable and having an outline generally the same as the free cross section of the filling frame and the flask. The piston plate is returned to its initial position after sand compaction.

REFERENCES:
patent: 3041685 (1962-07-01), Taccone
patent: 3170202 (1965-02-01), Huston, Sr. et al.

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