Method of making sand cores

Details Method of making sand cores Method of making sand cores

1996-10-04

1998-06-02

Batten, Jr., J. Reed

Metal founding

Process

Shaping a forming surface

164200, 164201, B22C 910, B22C 1524

Patent

active

057587086

ABSTRACT:
A closed core box is provided with one or more inlets for receiving and passing gas fluidized resin-coated sand to fill the interior of such core box, and with one or more screened outlets for allowing egress of such gas. A closed cylindrical or angular sand-fluidizing chamber is provided for each of the inlets, the chamber having one end connectable to a pressurized gas supply and an opposite end communicating with an inlet. At least part of each chamber is filled with resin-coated sand and a non-porous piston is placed on the sand within each chamber, each piston providing an annular gap (i.e. about 1/16 of an inch) with the interior of such chamber to direct the gas supply along the periphery of the chamber interior. The pressurized gas supply (40-80 psi) is connected to the chamber above the pistons whereby gas will move past each of the pistons to fluidize the sand therebelow in the chamber in a manner that continuously and toroidally recirculates the sand away from the periphery of the chamber while communicating with an inlet to the core box to promote smooth fluidized flow through such inlet, the piston moving down with the top level of the sand in the chamber as sand moves through the inlets.

REFERENCES:
patent: 2538770 (1951-01-01), Fea
patent: 4750540 (1988-06-01), Boenisch
patent: 4794976 (1989-01-01), Peterle
patent: 4912332 (1990-03-01), Siebel et al.
patent: 5135043 (1992-08-01), Drake
patent: 5354788 (1994-10-01), Johnson et al.
patent: 5535809 (1996-07-01), White

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