US1300347A

US1300347A - Method of and means for heating metal articles.

Info

Publication number: US1300347A
Application number: US21516818A
Authority: US
Inventors: James B Clarke
Original assignee: Individual
Current assignee: Individual
Priority date: 1918-02-02
Filing date: 1918-02-02
Publication date: 1919-04-15
Anticipated expiration: 1936-04-15

Description

1'. B. CLARKE. METHOD OF AND MEANS FOR HEATING METAL ARTICLES.

APPLICATION FILED FEB. 2. 1918.

1,300,347. Patented Apr. 15, 1919. 7 8 FIG 1 2 SHEETS-SHEET l.

WITNESSES I. B. CLARKE.

METHOD OF AND MEANS FOR HEATING METAL ARTICLES.

APPLICATION FILED FEB. 2. 1918.

1,300,347. Patented Apr. 15, 1919.

2 SHEETS-SHEET 2.

"'1 II M II I H T l I L g;

JAMES B, CLARKE, WOODLAWIF, PENNSYLVANIA.

METHOD OF AND MEANS FOR nnermemn'rn. ARTICLES.

To all whom it may concern:

Be it known that I, JAMES siding at Woodlawn, in the county of Beaver and State of Pennsylvania, a citizen of the United States, have invented or discovered certain new and useful Improvements in Methods of and Means for Heating Metal Articles,oof which improvements the following is a specification.

My invention relates to methods of and means for heating metal billets, bars or blanks prior to rolling or otherwise treating them in a heated condition.

The heating of such articles is frequently effected bycontinuous heating furnaces whi comprise elongate heating chambers pro 'ded at one end with a charging and at the ther end with a discharging opening,

the illets being caused to enter the charg g opening and to move slowly through.

111 the heating chamber until they reach the discharge opening, through which they are removed and passed to the rolls. V

For heatingbillets in such furnaces the present practlce is to introduce air and a combustible gas into the discharge end of the furnace and to effect combustion at such end, the gases resulting from the combus- In the practical operation of continuous heating furnaces of the character described,

it has been found to be impossible to effect complete combustionjof [the gases in the high heating zone at the discharge end of the furnace; and. my invention proceeds upon my discovery that, by introducing air into the heating chamber at a point intermediate the charging and discharging ends of the furnace, complete combustion of the gases may be effected, and that in consequence thereof the portion of the furnace to the rear of the heating zone may be maintained at a much higher temperature than heretofore possible with the result that the output of the furnace may be materially increased,

B. re-

illustrated my invention in its adaptability to two specific types of continuous heating furnaces.

Figure 1 is a plan/view of one type of furnace; Fig. '2 a vertical sectional view taken on the line II.II, .Fi 1; Fig. 3 a

side view of the furnace of Fig. 1; Fig. 4 a

combined plan and horizontal sectional view of a second type of furnace, the plane of view of the half of the furnace shown in section being indicated by the line IVIV, Fig. 5; and Fig. 5 a vertical sectional view of the furnace of Fig. 4; the plane of view being indicated by the line V-'V, Fig. 4.

' Having reference first to the furnace of Figs. 1, 2 and 3, the heating chamberl is formed by and between a downwardly in..

clined floor 2,' an arched topv 3,

end walls

4 and 5 and side walls 6 and 7. Billets to be heated are, by means of a suitable ram 8, pushed into the furnace through a charging opening 9 formed. in-the rea'r end wall 5;

are then caused to gradually slide down the inclined floor 2; and, when properly heated,

are removed from the furnace through a discharge opening 10 formed in the side walls 7 at the front or discharging end" of the furnace. Air and gas under suitable pressure are introduced through a passageway 11 Specification of Letters Patent. Patented Apr, 15 1919.

Application filed February-2, 1918 Serial No. 215,188.

into the heating chamber at the discharge end of the mace, combustion taking place immediately upon the entrance of such gases, and the heated gases resulting from such combustion being conducted back-' wardly through the heating chamber to a passageway 12 at the charging end of the furnace. Through this passageway the gases are carried downwardly to a stack or other means of disposal not shown herein.

For introducing air into the heating chamber for the purpose stated above, I preferably provide the top 3 of the heating chamber with a plurality of rows of air conduits 13, which incline downwardly and rearwardly so that the streams of air are projected into the heating'chamber in the same general direction as the rearward flow of gases through it. It will be observed that therows of. conduits extend transversely of the heating chamber from one I side to the other. While any desired numthree' rows are shown herein.

ber of rows of conduits may be provided (in some instances one may besuflicient),

For supplying air to these conduits, they are con- 1 nected to

headers

14 and 15, which in turn proper air pressure. The hea been found that the temperature of the rear are connected to a conduit 16 leading to a suitable fan or blower 17 for enerating the

ders

14 and 15 and the conduit 16 lying immediately above the top 3 of the heating chamber, the air entering such chamber will become preliminarily heated. In addition to the transverse rows of. air conduits, several conduits 18 may extend through the sidewalls 6 and 7 of the heating chamber.

The essential difference between the furnace of Figs. 1, 2 and 3 and that of Figs. '4

and 5 is that in the latter the billets to be heated are supported on a skeleton flooror skids 19, and combustion ismaintained below as well as above such support. Below the support 19 a mixture of air and combustible gases enter the heating chamber through a passageway 20, while above such support such gases enter throu h a passageway 21. The gases resulting rom combustion both above and below the. support are conducted rearwardlytoward the charging end of the furnace and flow downwardly through a passageway 22. The furnace of Figs. 4 and 5 also differs from that of Figs 1, 2 and 3 in that the discharge opening 23 is throught the end wall 24 of the'heating.

chamber. Y

The conduits for supplying air to the heating chamber at a point intermediate of the chamber of the furnace, at a position or positions to the rear of the normal-high heating zone,.to eflect further and complete combustion of the gases entering the discharge end of the furnace. In actual operation it has part of the heating chamber may be materially raised b the admission of air in the ,manner descri ed, with the result that the billets or other articles to be heated reach the high heating zone of the chamber at a higher tem erature than has been heretofore possible. ccordingly, the time required to heat a billet is substantially reduced and the output of' the furnace proportionately increased. Also it becomes unnecessary to Y maintain the high heating zone at the high temperature which has heretofore been required, and as a consequence thereof the furnace lining will deteriorate or burn out less rapidly than it usually does. It will be ob-- served of my invention that the increased output of the furnace is efiected without increasing thesupply of fuel, the resulting economy being obvious.

- According to the patent statutes, I hav described the principle and modeof operation of my invention, together with the improvements in furnace construction which I now consider to represent the best embodiment thereof. However, I desire to have it understood that, within the scope of the appended claims, my invention may be prac-.

tiscd otherwise than as herein specifically described and shown.

- I claim as my invention: I

1. A ste in the fabrication-of metal articlesas, or example, the rolling of pipeskelpthe method herein described of heatingabody of metal preparatory toshaping, such method consisting in causing the body to advance through a flame moving in opposite direction and nourished intermediate its length by fresh supplies of oxygen.

2. The method herein described of reheating asteel 'billet which consists in causing the billet to traverse a flame nourished intermediate its length by fresh supplies of oxygen in a direction opposite to that in which the flame advances.

3. In a continuous heating furnace, the combination of a heating chamber having a charging opening at one end and a discharging opening at the other end means for introducing air and a combustible gas into the discharging end of said chamber, means'for removing the products of combustion from the chamber at the charging end thereof, a plurality of rows of conduits disposed transversely of the chamber and rojectin downwardly and rearwardly t rough e roof thereof, and means .for projecting air through said conduits.

In testimony whereof I have hereunto set my hand.

JAMES B. CLARKE.

Witnesses:

T. M. GIRDLER, O. E. GRENBY.