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Publication numberUS3534946 A
Publication typeGrant
Publication dateOct 20, 1970
Filing dateAug 7, 1968
Priority dateAug 11, 1967
Publication numberUS 3534946 A, US 3534946A, US-A-3534946, US3534946 A, US3534946A
InventorsKossack Tore, Westerkamp Hans
Original AssigneeVolkswagenwerk Ag
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Through-flow furnace
US 3534946 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Oct.20, 1910 H.WESTERKAMP ETAL 3,534,946

THROUGH-FLOW FURNACE Filed Aug. '7, 1968 mw M NM MW k; hr 5 1 wry 5 W United States Patent US. Cl. 26328 3 Claims ABSTRACT OF THE DISCLOSURE A through-flow furnace for hardening workpieces by gas treatment composed of a chamber lined with blocks having the inner surfaces provided with a glaze and the blocks storing heat.

This invention relates to a through-flow furnace for the heat treatment of workpieces by means of a gas-producing medium, particularly for gas treatment.

In large manufacturing plants, the hardening of workpieces is carried out in through-flow furnaces in which the workpieces are placed in a transport container running on tracks or the like to pass continuously therethrough. These furnaces are equipped with a gaseous hardening medium, as producer gas, carbon generated gas, propane gas, etc., so that in known furnace structures in the furnace ceiling there is provided means to vertically agitate and force the flow of the gas.

Through-flow furnaces are inwardly coated with very porous heat-retaining or stored stones, bricks or blocks. The blocks have, for example, a porosity of 70%, a heat transmission rate of 0.306 keal/m. per hour, C. (at 1,000 C.) and a space weight of 700 kg./m. During the drive, the furnace is filled with a gas, CO content of only a small number of ten percent. Upon the operation of the furnace, the latter will be regulated for hours by the entrapped air in the walls together with the stored gas, so that the CO content of the furnace atmosphere may be too high. Only when the air is gainfully used up is it possible to load or charge the furnace.

In order to accelerate the formation of the gas-atmosphere, the invention suggests that the outer surface of the heat-storing blocks or stones shall be coated with a glaze or frosting. This glaze will prevent the air stored in the brick or block work from reacting with the carbonizing gas or any other gas generating and hardening medium. By means of the invention, it is possible with the 3,534,946 Patented Oct. 20, 1970 ice glazed furnace to provide an essentially quicker formation of the gas atmosphere.

The surfaced coating of glaze for the heat storing stones or blocks can be provided with any known ceramic having its composition for the person skilled in the art, of a nature so that the glaze can be applied without any diificulties.

Referring now to the drawing, the single figure is a cross-sectional view, of a furnace showing the invention.

The through-flow furnace can comprise any desired construction with an outer portion 1, mounted or supported on the floor or ground 2. An inner lining 3 of blocks or bricks forms an inner chamber 4 in which tracks or rails 5 may be provided to support the work container 6, which is portable. The inner surfaces 7 are coated with a glaze layer on the bricks, stones or blocks, which latter are heatstoring elements. A gas agitator 9 may be suspended from the ceiling 10 of the furnace and this element 9 agitates or stirs the gas atmosphere in the furnace. Any suitable suspension means 11 may be used secured to the ceiling.

We claim:

1. In a through-flow furnace for the hardening of workpieces with the use of a gas hardening medium, said furnace having an inner block lining of heat-storing blocks and having agitating means for stirring the gas hardening medium within the furnace, the improvement comprising the provision of a glaze coating on the inner faces of said blocks for the purpose of preventing any air stored in said blocks from reacting with said gas hardening medium thereby accelerating the formation of a gas atmosphere within the furnace by said gas hardening medium.

2. A through-flow furnace according to claim 1, in which an outer structure surrounds the inner block lining.

3. A through-flow furnace according to claim 1, in which an outer structure surrounds the inner block lining, and in which means are provided on a bottom surface of the furnace to support transport containers for the work pieces to be hardened.

References Cited UNITED STATES PATENTS 1,285,244 11/1918 Kunzler 26643 1,823,356 9/1931 Frink 266-43 X 2,167,801 8/1939 Flotron 263-41 X 2,293,089 8/ 1942 Wainer 26643 X 2,839,285 6/1958 Vickers 26342 JOHN J. CAMBY, Primary Examiner U.S. C1.X.R.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1285244 *Sep 14, 1918Nov 19, 1918W W LaphamMethod of constructing furnaces and fire-bricks therefor.
US1823356 *Nov 20, 1926Sep 15, 1931Robert L FrinkRefractory article
US2167801 *Oct 23, 1936Aug 1, 1939Crown Cork & Seal CoApparatus for manufacture of cork block and insulation
US2293089 *Apr 1, 1940Aug 18, 1942Titanium Alloy Mfg CoRefractory
US2939285 *Mar 19, 1957Jun 7, 1960Honeywell Regulator CoElectrically controlled hydraulic drive
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US5531423 *Aug 1, 1994Jul 2, 1996Consolidated Engineering Company, Inc.Method and apparatus for heat treating metal castings
US5551998 *May 30, 1995Sep 3, 1996Consolidated Engineering Company, Inc.Method and apparatus for heat treating metal castings
US5565046 *Apr 10, 1995Oct 15, 1996Consolidated Engineering Company, Inc.Combustion in oxygenated air, burning the binder, recovering the loose sands by fluidizing with air
US5738162 *Feb 20, 1997Apr 14, 1998Consolidated Engineering Company, Inc.Terraced fluidized bed
US5766542 *Apr 30, 1997Jun 16, 1998Hylsa, S.A. De C.V.Refractory bricks for iron ore reduction reactors
US5850866 *Sep 16, 1996Dec 22, 1998Consolidated Engineering Company, Inc.Heat treatment of metal castings and in-furnace sand reclamation
US5901775 *Jun 23, 1997May 11, 1999General Kinematics CorporationFor processing metal castings
US5924473 *Dec 20, 1996Jul 20, 1999General Kinematics CorporationVibratory sand reclamation system
US5957188 *May 15, 1998Sep 28, 1999Consolidated Engineering Company, Inc.Integrated system and process for heat treating castings and reclaiming sand
US5967222 *Apr 21, 1997Oct 19, 1999General Kinematics CorporationVibratory sand reclamation system
US6217317May 17, 1999Apr 17, 2001Consolidated Engineering Company, Inc.Combination conduction/convection furnace
US6336809Dec 15, 1999Jan 8, 2002Consolidated Engineering Company, Inc.Combination conduction/convection furnace
US6453982Jul 27, 1999Sep 24, 2002General Kinematics CorporationSand cleaning apparatus
US6547556Dec 21, 2001Apr 15, 2003Consolidated Engineering Company, Inc.Combination conduction/convection furnace
US6622775May 9, 2001Sep 23, 2003Consolidated Engineering Company, Inc.Method and apparatus for assisting removal of sand moldings from castings
US6672367Jan 31, 2002Jan 6, 2004Consolidated Engineering Company, Inc.Methods and apparatus for heat treatment and sand removal for castings
US6901990Jul 17, 2003Jun 7, 2005Consolidated Engineering Company, Inc.Method and system for processing castings
US6910522Aug 7, 2003Jun 28, 2005Consolidated Engineering Company, Inc.Methods and apparatus for heat treatment and sand removal for castings
US7258755Jul 26, 2005Aug 21, 2007Consolidated Engineering Company, Inc.Prior to introduction of the castings into a heat treatment station, the castings are subjected to heating sufficient to arrest cooling of the castings at or above a process control temperature for the metal
US7275582Oct 16, 2003Oct 2, 2007Consolidated Engineering Company, Inc.Methods and apparatus for heat treatment and sand removal for castings
US7290583Mar 9, 2005Nov 6, 2007Consolidated Engineering Company, Inc.Methods and apparatus for heat treatment and sand removal for castings
US7331374Jul 10, 2003Feb 19, 2008Consolidated Engineering Company, Inc.Method and apparatus for assisting removal of sand moldings from castings
US7338629Jun 1, 2005Mar 4, 2008Consolidated Engineering Company, Inc.Integrated metal processing facility
US7641746Aug 13, 2007Jan 5, 2010Consolidated Engineering Company, Inc.Heating sufficient to arrest cooling of castings at or above process control temperature for metal; heat treatment
US8066053Sep 17, 2007Nov 29, 2011Consolidated Engineering Company, Inc.Method and apparatus for assisting removal of sand moldings from castings
US8663547May 2, 2012Mar 4, 2014Consolidated Engineering Company, Inc.High pressure heat treatment system
Classifications
U.S. Classification266/252, 432/249, 266/286
International ClassificationF27D7/04, F27D7/00
Cooperative ClassificationF27D7/04
European ClassificationF27D7/04