US878840A - Metal-annealing furnace. - Google Patents

Description

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. MBTALANNEALING FURNAGE.

APPLICATION FILED JAN. 29, 19637.`

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RICHARD H. WARD, OF YOUNGSTOWN, OHIO.

METAL-ANNEALING FURNACE.

Specification of Letters Patent.

Patented Feb. 11, 1908.

Application led January 29. 1907. Serial No. 354.652.

To all whom 'it may concern:

Be it known that I, RICHARD H. WARD, a citizen of the Unitedl States, residing at Youngstown, in the county of Mahoning and State of Ohio, have invented certain new and useful Improvements in Metal-Anneal.- ing Furnaces, of which the following isA a specification.

This invention relates to the art of annealing and has special reference to an improvement in metal annealing furnaces.

To this end the invention contemplates a practical and effective improvement in furnace construction for metal annealing purposes wherebyT the process of annealing may be carried out with greater facility, and more uniform ,results than in the ordinary types of furnaces utilizing the well known charging boX within which the metal is sealed during the process of treatment. In this connection, the present invention has in view the equipment of a furnace structure with a permanent inner closed annealing oven or ovens arranged in a novel and effecte ive relation to the furnace walls, and to the heat circulation, whereby the very best and most satisfactory results may be obtained.

With these and many other objects in view, which will more readily appear as the nature of the invention is better understood, the same consists in the novel construction, combination and arrangement of parts hereinafter more fully described, illustrated and claimed.

The essential feature of the invention involved in the arrangement of` the inner closed annealing ovens within the main furnace casing is necessarily susceptible to some structural modification without departing from the scope of the invention, but for illustrative purposes a practical embodiment thereof is shown in the accompanying drawings, in which:

Figure l is a front end view (with the outer and inner `doors removed) of an annealing furnace constructed in accordance with the resent invention'. Fig. 2 is a horizontal sectional view on the line 2 2 of Fig. l, the View including the outer and inner doors respectively for the mai-n furnace casing and the inner annealing ovens. Fig. 3 is a vertical longitudinal sectional view through one of the side rows of burner holes, the line of section being indicated by the line 3-3 in Fig. 2. Fig. 4 is a central vertical longitudinal sectional view of the furnace on the line 4-4 of Fig. 2.

Like references designate corresponding parts in the several figures of the drawings.

While the distinctive feature of the prese ent invention resides in arranging within the heat chamber of a furnace casing, one or more closed -annealing ovens spaced on all sides from the top Vand walls of the said casing, a practical and effective arrangement of the inner ovens is illustrated in the construction shown in the drawings, and re ferring particularly thereto the numeral l designates the main outer furnace casing built of fire brick or other refractory material and preferably of a general rectangular form. This outer furnace casing essentially embodies in'its construction a base B for1n ing the foundation upon which is built up the o posite side walls 2 of the casing, the closer? rear end wall 3, the closed arched crown or furnace top 4, and the front wall 5, in which latter is preferably formed a pair of `door openings 6 each of which is designed to be covered anduncovered by the outer doors 7 having refractory or equivalent linings capable of withstanding the interior heat and at the same time serving to tightly seal the door openings of the furnace.

The important feature of the present invention resides inl building permanently within the interior heat chamber 8 confined within and by the walls of the outer casing l, one or more inner closed annealing ovens 9. In the double form of furnace shown in the drawings, there is one of the inner closed annealing ovens 9 arranged within the outer casing in line with one of the front door openings 6 so that the metal to be annealed can be introduced through each door opening directly to one of the ovens. The two ovens 9 are preferably duplicates in design and arrect y upon the furnace fioor'l() and consists of a rectangular casing construction consisting ofy the closed side walls 1l, the closed rear end wall 12, and the closed arched crown or top portion I3, while the front end of each oven or oven casing is formed with a front door opening 14 adapted to be covered and uncovered by the doors 15 provided with refractory or equivalent linings which are capable of withstanding the heat and at the same time effectually seal the opening in the front end of the oven chamber. Like rangement and each of the same is built di* the main outer furnace casing 1 the body or casing of each closed annealing oven is preferably constructed of fire brick or equivalent material, but in any form or con-.

struction, the said ovens 9 are spaced on all sides and at the top from the walls and top of the outer casing, so that upon the sides and at the top and at the front and rear 'ends there are heat circulating spaces entirely about the ovens, thus subjecting the latter throughout their entire extent, except on the floor 10 itself, to the action of the flame or heat, or both, within the interior heat chamber 8 of the furnace casing or body.

In order to secure the most uniform and practical results in the annealing process, a feature of importance resides in the special arrangement of the two ovens 9 in the main outer casing in their relation to each other and to the means employed forheating up the furnace and maintaining a circulation therethrough. In the construction shown,

l the'two ovens are arranged in spaced parallel relation within the heat chamber 8, and in kthe interval between the outer walls of the ovens and the side walls of the furnace casing, the latter is provided in the floor thereof with the side rows of alternating air and gas burner holes 16 and 17. Hence there is a row of holes 16 and 17 piercing the floor of the furnace casing at each of the opposite sides thereof, and the same are designed to furnish a supply of air and gas which mixes directly over the plane of the holes and is ignited so that combustion vtherefrom supplies the necessary llame and heat for heating the inner ovens 9 containing therein the metal to be annealed. The air supplying burner holes 16, in each row of such holes, form the outlets for a plurality of individual air feeding passages 18 formed in the furnace base B and in communication with a common air supply flue 19 likewise built in the furnace base and designed to have air circulated therethrough from any suitable source or supply. Likewise, the gas feeding burner holes 17 in each row form the outlets of a plurality of individual gas feeding passages 2O arranged vertically in the furnace base, and opening into a common gas supply flue 21, extending longitudinally of the furnace base and receiving a supply of gas from any suitable source. As plainly shown in the drawings, this arrangement of the passages and flues 18, 19, 20 and 21 isv duplicated at the opposite sides of the furnace, and within the central portion of the furnace base the latter has formed therein a common central draft flue 22 in communication with the stack connection 23 and also in communication with a plurality of draft ducts 24 piercing the furnace floor alon the longitudinal center thereof to provi e a plurality of outlet ports 25 between the vpair of ovens 9.

The furnace fioor 10 is provided therein with tracks or ways 26 of the usual form and which extend into the innerovens 9 and through both door openings 6 and 14, said tracks or ways being designed to support for l travel thereon the truck upon which the metal to be annealed is piled.

The improved construction of furnace herein described entirely dispenses with the ordinary way of charging the furnace by loading the metal into an annealing box, and only re uires the piling of the metal on a plate, fa se bottom, or upon a truck which is slid into the oven compartment, after which the doors are closed and the furnace thus made ready for immediate firing.

I claim:

1. In a furnace for annealing metal, a main "outer furnace casing closed upon all sides and provided with a pair of front door covered openings, a pair of inner closed 4annealing ovens having their walls built directly on the main inside floor of the outer casing and spaced on all sides from the top, sides, and ends of the latter, said ovens being also arranged in spaced relation to each other with a clear unobstructed space therebetween, and means for supplying heat to the outer sides of the two ovens from the floor of closed ovens built permanently within the outer casing directly on the floor thereof and spaced from each other with an unobstructed space therebetween, and also spaced from the top and walls of the outer casing, the outer wall of each oven arranged along side of a side row of said alternating air and burner holes.

In testimony whereof I hereunto aflix my signature in the presence of two witnesses.

RICHARD n. WARD.

Witnesses:

C. C. Woonwon'rn, J. I. FRANCIS.

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