US2563908A - Forge furnace - Google Patents

Description

FORGE FURNACE Filed July 16, 1948 E. K. BASTRESS ET AL g ug. 14, 1951 Patented ug. i4, 195i' FORGE FURNACE Ernest K. Bastress and Ernest G. de Coriolis, To-

ledo, Ohio, assignors to Surface Combustion l Corporation, Toledo, Ohio, a corporation of Ohio Application July 16, 194s, serial No. 39,054

This invention relates to a fuel heated forge furnace and has for its general object to provide a furnace whereof the wall enclosure which forms the furnace chamber shall be comprised of `individually supported sections arranged end to end and supported in a manner to permit any particular section to be readily removed for replacement purposes. Other related objects will appear hereinafter. For a consideration of what we consider to be novel and our invention, attention is directed to the following specification and the claims appended thereto.

In the accompanying drawing forming part of this specification,

Fig. 1 `is a plan view of a furnace embodying the present invention.

Fig. 2 is a side elevation of the furnace shown in Fig. 1.

Fig. 3 is a vertical transverse section on line 3-3 of Fig. 1.`

Fig. 4 is an enlarged fragmentary vertical sectional view at the joint between abutting sections of which the furnace chamber is comprised.

Fig. 5 is an enlarged fragmentary cross section on line 5-5 of Fig. l..

Fig. 6 is a side elevation of Fig. 1.

The Wall structure IU which forms the furnace chamber II is comprised of a plurality of intermediate sections I2 between front and rear endV sections I3 and I4, respectively. The several sections I2, I3 and I4 have cylindricaltunnels and are independently Vsupported on a support I5 comprising a pair of longitudinally extending rails or side beams I5 between which the sections are adapted to be disposed with their tunnels in axial alinement to define a continuous furnace chamber which is circular` in vertical section. All of these several sections, except the front section I3, are free to move lengthwise with reference to the supporting beams or rails I5 as longitudinal thermal expansion of the Wall structure III may require. Y

. The front section I3 (which is the Work entering end of the furnace chamber) is supported on the rails I5 by side arms I6 which extend from the upper portion of the section and which are joined at their outer ends by connecting plates I1 adapted to rest on and be bolted to said rails. The rails I 5 constitute the top side of an elevated structure between which a substantial portion of the wall structure IB is disposed. Brackets 2| are bolted to the structure 2U to assist in anchoring said front section against longitudinal displacement on said rails.

Yieldable means are employed to maintain the 2 wall structure II) as a whole under sufficient 1ongitudinal compression to maintain the several sections thereof in abutting relation. The means for this purpose will ordinarily comprise coil springs 22, Vone at either side of the furnace, tending to slide the rear end section I4 of the furnace chamber toward the front end section thereof by acting on horizontal pull rods '23 connected to side brackets 24 carried by saidsection I4. The rods conveniently extend through pillarsl 25 which comprise partof the lelevated structure'- 20 and the springs are carried by their respective pull rods to abut said pillars.

The means for transmitting the load of the individual intermediate furnace chamber sections I2 to the supporting'rails I5 comprises for each section a pair of arms 26'Which extend over said rails from the upper portion of the section, the cuter ends of the arms being joined by a connecting plate 21 on which a pair of vertically adjustable screws 3U are mounted for the purpose of leveling the section with reference to said railsl and the adjacent sections so that all of the sections may be in axial alinement. These screws do not rest directly on the supporting rails but on caps 3| individual to said screws, the caps in turn resting on a plurality of antifriction rollers 32 supported directly on the rails I5 between side flanges 33 onthe latter. A central `longitudinal bracing member 34 extends between the supporting arms 26. The load of the rear section I4 is transmitted to the supporting rails I5 through antifriction bearings in the same manner as the intermediate sections I 2.

The front and rear end sections I3 and I4 of the furnace chamber are each closed by an end wall 31 having a. slot-type work passage 40. The work W to be heated is advanced through the furnace chamber on internally cooled skid rails 4I, these rails being supported at longitudinal intervals atop transversely extending bridge walls 42. Other internally cooled tubes 43 may also be supported on said bridge walls alongside of the path of travel of the work pieces to serve as lateral guide rails for the Work pieces. A reciprocating pusher 39 will ordinarily be employed to advance the work pieces along the skid rails.

Each of the intermediate sections I'2 of the furnace chamber has a high temperature refractory lining 44 inside of an exterior metal shell or casing with a layer of heat insulating material 45 therebetween. Because molten slag is formed when scale from work pieces contacts the very hot furnace walls, and this slag has a deleterious effect on the refractory lining 44, the bottom portion of the furnace chamber I I Where the slag tends to collect is provided with a slag collecting trough or apron 46 of slag resisting refractory material. The underside of the bridge walls 42 is above this apron so that it will not prevent molten slag from passing thereunder.

The refractory lining of each intermediate section l2 is extended slightly beyond the ends of the exterior metal casing 35 to insure that the adjacent ends of the refractores rather than the ends of the metal casing about each other when` the sections are in abutting relation thereby reducing to a minimum the likelihood of the ends of the metal casing becoming overheated by leak? age of hot gases and molten slag at the joint between said sections. An internal metal ring 41 within each end of the casing serves to impart rigidity to the edge of the latter and to key it to the corresponding refractory section, with space between the adjacent rings and casings to allow for differential expansion, thus keeping the burner nozzles 5l substantially alined. with f -uel inlet ports 50 A, removable metal strap about. adieeent ends of the. metal shell 35 tends. to hold Said. ends in. alinement.

Heat is produced' inthe furnace chamber I l by burning fully eerzted fuel therein in Contact with the inner cylindrical surface of the refrac-f` tory lining 4.4 whereby the latter is rapidly heated to. lsuch elevated temperature that it constitutesy a. source of radiant heat for heating the work pieces in the chamberto forging temperature. Ilhe fuel is introduced into said chamber through a multiplicity of tangential inlet ports 5o formed in the refractory lining 44. of the intermediate furnace chamber sections l2. Aerated fuel underpressure isdelivered to said ports by individuel fuel supply nozzles 5I mounted on the outer metal shell 35. of thel chamber sections l2. The aerated fuell is. delivered to Seid. nozzles 5l by supply conduits 53 which lead from supply manifolds 5.4.L As best shown in. Es- 2. each. of the inter mediate sections I2,v of the furnace chamber willV have its own group of fuel supply nozzles 5i and its own. fuel supply manifold for the same so that the supply of fuel to the several sections may. be si independently controlled. The Crossed lines ,521

indicateA diagrammatically the fuel supply nozzles 50 for the other intermediate Sections i2, The end sections I3 and i4 each has a stack 55 for exit of the combustion products from the furnace chamber il.

The skid rails. lll and the lateral guide rails 4 3 associated therewith are so mounted-that ther may be readily withdrawn from the furnacecharnber either for replacement pur-poses cr preparatory to, removing any. particular. fur-nacecbamber section for replacement purposes. Such outside connections as must, be severed. betere any particular section can be removed for replacement, purposes are readilyaccessible. The gas supply manifolds 5,4 are. anchored to the sup-` porting structure 20; hence, the fuel deliveryv conduit?, 5,3. between the same and the dischaijgel nogzles 5.0. comprise flexible tubing to compensate for longitudinal movement of the furnace charri-4 bei* sections plants where space is at a premium and where nigh temperature head must be maintainedn the furnace chamber whereby to, heat the work as rapidly as possible to reduce the formation of scale on the work to a minimum.

The furnace has special utility in From the foregoing description it will now b seen that the present invention provides a fuel heated forge furnace that is well adapted for its intended purpose.

What is claimed is:

l. In a furnace for heating work to elevated temperature, in combination, structure defining a single elongate furnace chamber wherein the work is heated, a horizontally-elongate support whereon said structure is mounted, said structure being transversely split to divide the same into a plurality of sections including end sections and at least one intermediate section, said sections being individually removably mounted on said support to :permit independent removal of said sections from said support for replacement or repair, said sections each comprising an external metal casing and a lining of refractory material therewithin, and means for releasably holding said sections in contacting relation.

2. In a furnace for heating work to elevated temperature, in combination, structure dening a single elongate furnace chamber wherein the work is heated, a horizontally-elongate support whereon said Structure is mounted for thermal expansion and contraction, said structure being transversely split to divide the same into a plurality of sections, said sections being individually removably mounted on said support to permit independent removal of said sections for replacement or repair, said sections each comprisingan external metal casing and a lining of refractory material therewithin, and means for maintaining said structure under longitudinal compression,

3. In e furnace for heating Work to elevated temperature, in combination, structure defining a Single elongate furnace chamber wherein the work is heated, a horizontally-elongate supportwhereon said structure is mounted, said structure being transversely split to divide'the same into a plurality of sections including end sections and at least one intermediate section, said sec; tions being individually removably mounted on said support to permit independent removalof said sections for replacement or repair, said secf. tions each comprising a metal shell and a refractory lining within said shell, and said Shells at the abutting ends of said'sectionsterminatingl short of the refractory lining to insure that the adjacent ends of the refractory linings but not the metal shells shall be in abutting relation at the abutting ends of said sections.

ERNEST K.. BASTRESS.. ERNEST G. DE CORIOLIS.

REFERENCES CITED The following references are of record in the Ille of; this. patenti UNITEDl sfr-ATEs PATENTS

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