Metallurgical apparatus – Process
Patent
1994-08-01
1996-07-02
Kastler, Scott
Metallurgical apparatus
Process
266252, 148538, 148545, C21D 500
Patent
active
055314236
ABSTRACT:
An improved method and apparatus for heat treating metal castings with sand cores provides for removal of the sand core and recovery of the sand core material for reuse. The method and apparatus eliminate the need for removing the sand core from the casting prior to heat treatment and thus eliminate the labor, expense, and possible damage to the casting incidental to conventional core removal techniques such as chiseling and shaking. The method involves heating the casting with sand core therein to a temperature sufficient to burn off the binder component of the sand core. The sand comprising the sand core is then blown out of the casting by directing a flow of air over the workpiece. The sand thus dislodged is then collected for reuse. According to the disclosed apparatus, the castings are heated in a furnace having fans for directing a flow of air over the workpieces. The sand dislodged from the castings falls into a trough in the lower portion of the furnace, where it is collected and conveyed to a central collection bin for reuse. In another aspect of the disclosed apparatus, the castings are subsequently immersed in a quench tank. The quench tank includes agitation means for agitating water over the castings to dislodge remaining sand. The sand falls to the bottom of the tank, where the sand and a portion of the water are removed from the tank. A major portion of the water is then removed from the sand so that the sand can be reused.
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Sales brochure describing Thermfire Brand Sand Reclamation, Gudgeon Brothers, Ltd., believed to be known by others prior to Sep. 1989.
Sales brochure describing Simplicity/Richards Gas-Fired Thermal Reclamation Sys., Simplicity Engineering, Inc., believed to be known to others prior to Sep. 1989.
Sales brochure describing Fluid Bed Calcifier Therman Sand Reclamation Sys., Dependable Foundry Equip. Co, Inc., believed to be known by others prior to Sep. 1989.
Sales brochure describing AirTrac Brand fluidizing conveyor, AirTrac Sys. Corp, believed to be known by others prior to Sep. 1989.
"Economical Used Energy Type, Continuing Heat Treating Furnace For Aluminum Castings"-Kogyo-Kanetsu, vol. 21, No. 2, pp. 29-36-Published Mar. 1984.
Paul M. Crafton-Heat Treating Aging System Also Permits Core Sand Removal; reprinted from Sep. 1989 Modern Casting Magazine.
Advertisement describing Beardsley & Piper PNEU-Reclaim Sand Reclamation Units Dec. 1989.
Advertisement describing Flataluminium Sand Reclamation Units Dec. 1989.
Crafton Paul M.
Crafton Scott P.
Consolidated Engineering Company, Inc.
Isaf Louis T.
Kastler Scott
Witherspoon James A.
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