US1872062A - Roll for heat treating furnaces - Google Patents

Description

R. BURKE ROLL POR HEAT TREATING FURNACES Filed Jan. so. 1929 Juvzzfor- E N w/V WN Aug. 16 1932.

Patented Aug. 1651932 UNITED STATES RALPE BURRE, OF

PATENT OFFICE SPRINGFIELD, OHIO, ASSIGNOR TO THE OHIO STEEL FOUNDRY COM- PANY, OF LIKA, OHIO, A CORPORATION OF OHIO BOLL FOB HEAT TREATING FURNACES Application filed J'anuary 30, 1929. serial No. assms.

ticles, resulted in a large percenta e of mould-- ing losses. This in addition to t e hi h cost of heat resisting material utilized in t e roll, is reflected in the high initial cost of such :furnaces as well as maintenance thereof due to replacement of the rolls.

In carrying out my invention, I provide an improved Construction of roll wherein the enlarged cylindrical portion thei-cof which extends within the furnace is made of a separate casting, preferably of heat resisting al loy, while the end portions of the roll w ich provide bearings on the exterior of the fur 26 nace, are made of cheaper metal, but with allowance for expansion and contraction at the joints between the separate .castings which make up the roll. i

The invention may best be understood by reference to the accompanying drawing in which Figure 1 is a transverse section of a portion of a furnace showing my improved form of roll in longitudinal cross section.

Figure 2 is a section of the roll taken on line 2-2 of F igure 1.

Figure 3 is a section of the end casting at the driving end of the roll taken on line 3-3 of Figure 1.

Referring now to details of the embodiment of my invcntion illustrated hercin, the furnace walls are indicated at 10-10 having apertures 11-11 therein through which the roll 12 extends. It will be understood that a plurality of such rolls are provided in substantially horizontal alinement with each other in the usual manner so as to support material thereon as it passes through the furnace. The rolls are also supported as usual in hearing supports 15-15 at opposite ends of the roll on the outside of the furnace asshown. The roll may be driven in any sutable`manner, as for instance, by a gear 16 mounted on a reduced end portion 17 at one end ofthe roll.

Referring now more particularly to the details of Construction which form the subject matter of my invention, it will be seen that the roll 12 is made up of three sections, namely, a main cylindrical section 20 and end sections 21 and 22, the latter end section herein being at the driven end of the roll which carries the ear 16 thereon. The main section 20 is pre erably formed of heat rement within the end of the main section 20,

a reduced hearing portion 28 which engages in one of the hearing supports 15-15 as shown, and a flange portion 29 having a series of lugs 30-30 which are adapted to have interlockng engagement in the recesses 26--26 formed in the adjacent flange 25 ofthe main section 20. The end casting 22 is preferably hollow throughout its length as shown so as to provide ventilation for the roll.

It will be noted that the' reduced extension 17 on which the driving gear 16 is mounted,

forms an integral continuation of the bear- .ing portion 28 of the end casting 2 2.

the end thereof, and a reduced hearing portion35 engaged by its roller support 15.

From the abovedescr-ption it will now be understood thatthe roller, although made up of three separate parts as described, can be made more economically than by the usual integral molding processes as heretofore employed. The use of relatively' expensive heat resisting alloy is preferably restricted to the main section 20 and this main portion can be far more easily cast With its relatively large end openings than was possible when the entire roller including its restricted end portions were molded by the use of chaplets which were found necessary in order to support the internal core. If light chaplets were used for this purpose they would often fuse and allow the core to sag thus causing unevenness and thickness of metal, and if large chaplets were used they would not fuse into the metal sufliciently and would cause objectionable surface blemishes. The necessity for chaplets is entirely eliminated in forming a uniform section cylindrical casting for the main roller section 20, as shown herein.

The end castings 21 and 22 are of course relatively simple from the molding standpoint, and owing to the fact that they are removed from the more intensive heat of the furnace, it is possible to make these castings of cheaper metal and thus save in the cost of the entire roll. i

The parts are readily assenbled by slipping the end sections longitudinally into the main section, the parts preferably having relatively loose fitting engagement so as to allow for expansion and contraction of the associated parts while' in operation. The driving connection between the end section 22 and the main roll is especially simple in Construction and arrangement since it is effected by slipping the end member 22 endwise into the main section-20, with the lugs v in registering position with the notches 26 on said main section.

I claim as my invention:

1. As a new article of manufacture, a roll for heat treating furnaces comprising a hol'- -l'ow central cylindrical main section composed of a high heat resisting alloy and substantially of uniform interior cross section throughout its length, end members each consisting of separate casting members of a different material having fitting engagement in the ends of said central section to permit freedom of expansion and contraction thereof relative to said separate casting members hearing portions forming supports for opposite ends of the roll and having openings therethrough to provide for the ventilation of the roll, and endwise movable interlockin drivng connections between one of said en members and said main section. a

2. As a new article of manufacture, a roll for heat treating furnaces comprising a hollow central cylindrical section composed of a high heat resisting alloy and substantially of uniform cross section throughout its length, end members each consisting of separate pieces of a different material having fitting engagement in the ends of said central section to permit relative expansion and contraction of the different materials, said end members provided with reduced bearing portions :Eorming supports for opposite ends of the roll and having openings therethrough to provide for the ventilation of the roll, said central section having an outwardly projecting radial flange at one end thereof, and endwise movable interlocking driving connections'between said flange and one of said end members. p

3. In a heat treating furnace, a roll comprising a hollow cylindr-ical central main section composed'of a high heat resisting alloy and substantially uniform interior cross section throughout its length extending transversely of the furnace with its ends extending through the side walls thereof, end castings of different material formed hollow for ventilating the roll and providing supports extending inwardly of the side walls of the ends of said main section and reduced journal members extending outwardly from said side walls of the furnace, fixed bearing mem-` -ings of different material having enlarged cylindrical dportions fitted endwise into the bore of sai central section and having reduced bearing portions forming supports for o posite ends of the roll, said end members a so being hollow for ventilation of the roll through said reduced bearing portions, and means whereby said central section may be driven by the rotation of one end member,

comprising an outwardly extending flange on its enlarged cylindrical portion abutting the extreme end ofisaid central section, and means eonnectin the abutting' portions of said flange an said central section. said end members provided with I reduced v January, 1929.

Sgned at Springfield this 25th day of RALPH BURKE.

-furnace having fitting engagement in the

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