US2146793A

US2146793A - Method and apparatus for roll treatment

Info

Publication number: US2146793A
Application number: US126156A
Authority: US
Inventors: George J Buckner
Original assignee: Bethlehem Steel Corp
Current assignee: Bethlehem Steel Corp
Priority date: 1937-02-17
Filing date: 1937-02-17
Publication date: 1939-02-14
Anticipated expiration: 1956-02-14

Description

Feb. 1.4, l1939. G. J. BUCKNER 2,146,793 A METHOD AND APPARATUS FOR ROLL, TREATMENT Filed Feb.A 17, T937' s sheets-sheer .1

.L IL

Feb. 14, 1939. G. J. BucKNl-:R

METHOD AND APPARATUS FOR ROLL TREATMENT Filed F`eb. 17, 1937 3 Sheets-Sheet 2 Feb. 14,1939. G.' J. BUCKNER 2,146,793

l METHOD AND APPARATUS FOR ROLL TREATMENT Filed Feb. 17, 1,937 3-SheetS-Sheet 3 rd-v I 961955,10.; 10J

.Patented Feb. V14, 1939` UNITED STATES METHOD AND APPARATUS Fon TREATMENT BOLL George J. Buckner, Bethlehem, Pa., assignor to Bethlehem Steel Company, a corporation of,

Pennsylvania Application February rx, 1931, sensi No. 1126.156

42 Glaims. `((11. 286-8) My invention relates to newand useful improvements in a method and apparatus for hardening-and tempering tubular or cylindrical articles, and relates more especially to the treatment of steel rolls forrolling mills or the like.

It is well known that the rate and method of cooling has a definite effect on the degree of hardness, the resulting .microstructure and the stresses set up in steel quenched from above the critical temperature. As a general rule, the hardness is1 greater vand penetrates more deeply, the more drastic the quench. The microstructure of the hardened part will be martensitic, and as martensite has a larger volume than the rest of the section which has not been exposed to the quenching medium, compressional stresses will be set up in the hardened parts.- MoreoverI these stresses -in crease and reach a maximum as the object reaches ordinary temperatures. These stressesv are not only caused by volume changes, but also occur during the quenching operation due to the temperature gradient existing between the parts directly exposed to the quenching medium and the interior of the object which is not exposed to the quenching medium.

In Aview of the above mentioned facts, another object of my invention is to Vprovide means for simultaneously cooling the surface and inside of cylindrical articles so as to produce a more univ form structure and to minimize the temperature gradient between surface and center thereby min'- l 'imizing the stresses usually set up when large objects are quenched on one surface only.

Another object of the invention is .to decrease the length of time usually required for quenching large cylindrical objects. For example, -I find that in quenching a roll twenty inches ixildiaiii-l eter, thetime required for its temperature to fall to 300 F. when quenched according to thepres'- V ent invention is approximately twenty-five minutes-in contrast tol previous methods which rev quired approximately one hour. v- Another object 4of the invention is to' provide means for uniform and reproducible results by 45. simultaneously quenching the surface and bore of cylindrical objects by means of continuous sheets of quenching mediums. Thus, by regulating the pressure and volume of the quenching medium,

cylindric'alobjects y bequenhed for aden- Anitepericil of time,

removed and placed in the tempering-bath to re- 'move residual stresses: and prevent the high stresses occurring at ordinary temperatures.A For example, I find that a cylindrical roll. of 20 inch 55 diameter and -ofoe'rtain analysis when quenched length.

ter which the object can be from l550 Fgaccording to the present` invention, requires about 25 minutes to reach a uniform tem- Y perature of 300 F. It may then be placedin la tempering' bath at 300 F. to remove harmful stresses and prevent the formation o f'stresses 5' which would have been setup if the object had been cooled to lower temperatures.

Another-object o f the invention is a method of simultaneously quenching the surface and bore of cylindrical objects by two different types of 10 quenching media, so as tol produce different propertiessuch as hardness and ,microstructure in the surface and the bore. Eor example, the surface and bore mayl be simultaneously quenched by' water and oil' respectively. or vice versa.

Another object of th invention is to provide means for simultaneously quenching the surface and bore of cylindrical-objects and stopping` the quenching action at eitherthe surface or bore or both and utilizing the esidualheat in-the body of 20 the object to temper the hardened sur-face'.

Another object of my invention relates to av method of controlling the 'quenching operation in hardening and tempering a roll in 'such a wayy that the cross-sectional hardness produced will be 25 proportional to the tangential stresses developed in service.

Another object of my invention relates to a method of hardening a'roll havinga bore'by quenching it internally and externally, vthe heat 30 `transfer rate from both internal and external surfaces being controlled and /varied .during the quenching `period so as to produce the desired hardness proportional to the tangential stresses developed in service. 35

Another object of my invention is to provide a machine having means. for simultaneously quenching the external and internal surfaces lof a roll having means which will permit variable rates 40 of heat transfer during theoperation.V Another object of my invention relates to arrangement and construction ofthe'spray nozzles which are adapted to-provide a plurality of continuous sheets' of quenching uid to /strike the 45 I vertical sides of the-roll at an-'angle to ,the roll surface.` The length and widthoil'v each no zzle being adjustable forV rolls of different. sizes aid Anothery object of my invention relates to the 50 mechanism forsupporting the upper end of the roll Land for` rotating the said roll during the quenching operation. Y Y v Another object of my invention relates to the arrangement of the swinging spray pipes and the roll diameters.

Another object of my invention relates to the rotating centeringdevice and the adjusting means J therefor which is adapted for vertical movement yto support the bottom end of rolls of different lengths. v l.

Another object of my invention relates to the mechanism for Swinging the spray pipes'and the adjusting means therefor to allow the sprays to strike the roll being quenched at different angles.

Another object of my invention is to `provide a machine having means for controlling the pressure ofthe quenching fluid and in which the roll speed can be varied and the direction ofrotating of said roll may be either with or against the spray direction, as required. y

A further object of my invention relates to the manner o f quenching the bore or inside of the roll and for controlling it independently of the external quenching.

Other objects of my invention will hereafter appear. l

There is a marked difference between the method of lloading and consequent stresses encountered in two high and four high work rolls in mills dur. ing the rolling operation.

Two high rolls. in a mill are mechanical1y. beams-with xed'ends uniformly loaded across their central section. The resulting stresses during the rolling operation due to bending and driving torque are greatest at the outer surfaces, and decrease towards the center.

A four highv roll in a mill during the rolling operation is compressed between the back up roll Having thus given a general description of thev objects of my invention, `I will now in order to make the same more clear, refer to the annexed three sheets of drawings forming a part of this specification and in which 'like characters of reference indicate like parts.`

Figure 1 is a vertical longitudinal section taken substantially on the line I-I of Fig. 6 -with the spray pipes indicated in the position they `will assume for quenching a roll of the largest diameter for'which the machine is designed.' the roll being indicated in dotted lines.

Fig. 2 is a transverse section through one of the spray pipes taken on. the line 2-2 of Fig. 5, but drawn on an enlarged scale showing the manner of closing a portion of the nozzle openings.

Fig.-'3 is a transverse section taken on the line 3-3 of Fig. 1 illustrating-the manner of adJusting the width of the nozzle openings.

Fig. 4 .is an enlarged detail view of the, spring loaded. dash pot and the adjustable tubular center Fig. 'I is a transverse section taken on the linev 1-1 0f Fig. 1. l

Referring now to the various characters of reference on the drawings:

The numeral I indicates the outer cylindrical casing` of the machine which is arranged vertically lpair of annular concavo-convex dished plates 4 having anged outer edges welded to the inner surface of the cylindrical casing I, said dished plates 4 are disposed with their convex surfaces facing each other to provide a spaced doubleV bottom wall adapted to form a chamber for receiving through the inlet'pipe 5, the quenching iluid and distribute it to all the stand and spray pipes. 'I'he central portion of each of the concavoconvex dished plates 4 is perforated as at 8 to receive a short tube 'I which is welded thereto and forms the exhaust opening for the cooling medium-after the quenching operation. v

A.plurality of equally spaced vertically extending flanged bars l preferably three in number and of AT-section are attached to the inside of the cylindrical casing each having its leg extending inwardly and perforated as at 9 for engaging the v outer ends of arms I of the spider II which are perforated as at I2 and adapted to register with the perforations 9 in the bars 8 for receiving pins or bolts I3 to allow the spider to be adjusted vertically to support rolls of dinerent lengths. The central portion of the spider II is formed with a lhub I4 having a cap extension I5 attached to its lower end. The said hub I4 and the cap I5 are adapted to form a dash pot cylinder for receiving a plunger I6 having a socket I1 formed in its lower end for receiving the upper end of a helical spring I8, while the lower end of said spring engages the/inner face of the head of the cap I .which isV perforated centrally as at I9. The

plunger IB is formed tubular and provided with a vertical groove'20 for receiving the inner end of a set screw 2I threaded into the hub I4 to prevent the plunger from turning. 'I'he plunger is also provided with races for receiving ball and

roller bearings

22 and 23 respectively, adapted to support'a rotating sleeve 24 having a flanged upper end 25 provided with an annular groove 28 for receiving the inner end of a retaining screw 21. An

annular groove 28 is formed in the upper end of the sleeve 24 in which is seated the lower surface of a co1lar.29 of atubular center 30, the lower end `of which extends into .the rotatably mounted lsleeve 24 while the upper end projects above the collar and is inserted in the lower end of the bore II of the neck of a roll 32 during the quenching operation. I'he lower end of the roll l2 engages the top of the collar and is centered and resilientiy supported by the dash pot. As different sized rollsI can be treated in this machine the center 30 may be made interchangeable for this purpose.

An annular track I! is secured to the top end of the cylindrical casing I having a beveledtop track tread surface 34, outer track side tread.

' surface 3B and an outwardly extending top ledge A turntable 31 is supported upon the annular track 33 having beveled rollers 2l for m8181118 the top beveled track tread surface 24 and side rollers Q8 for engaging the outer track side tread surface 26 to prevent lateral `movement of the turntable, while the ledge 26 prevents the turntable 21 from being disengaged from the machine. The turntable has a central opening 40 formed therein which is surrounded by a downwardly extending annular flange 4| which is provided at its lower end with a thickened portion having a beveled inwardly extending seating surface 42 for engaging and supporting the beveled Isurface 43 of an annularhead 44 of a hanger v45.4 The lower surface of the hanger head 44 is recessed .as at 46 and the edges perforated. as at 41 for receiving bolts -48 for attaching an annular split ring 49.thereto, which` has a anged vinner upper edge 50 extending into the recess 46. .The upper end of the neck of the roll 32'Aextends, through the annular ring 49 and is provided with a collar for engaging the` iiange- 50 of the split ring 49 and is centered and sup-f the upper end of the cylindrical casing I adjacent to the turntable. The journal housing 5| is provided with roller bearings 53` for supporting a horizontally arranged drive sha ft 54 driven by a motor 55 having a variable speed. Said drive shaft 54 has a bevel vgear 56 mounted thereon meshing with a similar bevel'gear 51, mounted'- on the lower end of a vertically disposed shaft 56 which is journaled in roller bearings 59 in the housing 52. The upper end of shaft 58 has a pinion 60 keyed thereto meshing with the toothed peripheral edge 6I of the turntable. The roll y32 is suspended vertically and supported at thetopend by the turntable which rotates it about its longitudinal axis between a series of sprays, while the bottom end of said roll is centered and supported by means of the tubular center 30 and dash pot.

The spray pipes 62 preferably three in number lmunicate with the'distribution chamber'for 'the' quenchingfiuid formed between thedished plates -4 fu l .The spray pipes 62 are each provided with aj vertical slot 10 adapted to form a spray nozzle4 to produce a continuous vertical sheet of spray for the surface of the roll during .the-quenching op l eration. As indicated more clearlyin Fig. '3 th'e width of the openings can be adjusted by means- Iof adjustable'strlps 1| which are attached to the at. surfaces of the spray pipes 62 by.means of stud bolts 12 passing through slots 131`int'he strips and clamped in position by means of nuts 14. These strips 1| may be adjusted thesame distance apart, `or one end may be spaced wider apart to give a greater-quenching ow at one endof the spray pipe'if desired.

A'. indicated-1n Figs; 1, 2 and 5 the 1ength o f the vertical slotsv ornozzles can be adjusted for rolls of different lengths by 'closing a portion of the slotby means of rectangular bars 15 which are held in position by'means off, clamps I6 and set bolts 11. .In'Fig. 1 these rectangularbars 15 are shown as attached to the l'top and bottom end v portions of the spray pipe 62, but it be readily The lower end of each spray pipe is seated in a socket on the swinging' end of the bracket arm 64. When the set bolt'19 isunscrewed slightly the spraylpipe can be rotated to allow the spray to 'strike the roll surface at any' desired angle from the .radial to the` tangential. After the desired angle of the nozzle is secured the set bolt is screwed tight against'the spray pipe, and a lock nut`8| on the set bolt prevents the said set bolt 19 from loosening.

The spray pipes 62 are adapted to swing in an arcuate path inwardly or outwardly. in unison lfrom the central portion of the machine to suit various `roll diameters by the following mechanism;

L A horizontally disposed fluid pressure cylinder 82 is attached to the outside of the upper end of the cylindrical1 casing I by means of bracket plates 83. A plunger 84 having a transverse opening 85 farmed centrally therein and provided with pis- Y tons 86 and 81'at oppositeends is mounted inthe cylinder 82. socket 88 89 for a grad .ted stop 90 for limiting the move- `ment of the plunger. Anarm 9| is attached as at 92 to the ange 66 of one of the stand pipes 65 and is provided with .a disk shaped outer end whichextends into the openingin the plunger 84. Projecting ears 93 extend outwardly Vfrom the opposite sides of the intermediate portion of v the arm 9| to each of whichis pivoted asy at 94 one end of an adjustable link 95, the opposite end of each of which is pivoted as at 96 to the arm 91 a bracket |00, which is secured -to the outer sidev er the cylindrical casing l. An adjustable imk L. |0| having one end pivoted as at |02 to the otherarmy |08 of each bell crank lever and the opposite end to an arm |04 which is attached to the flange 66 oif the other two stand pipes 65 as at |05.

When the spray -pipes 62 are in-,the posit-ion indicated in i'ull lines in Fig. 6 they willbe in position tospray'rolls of the smallest diameter to which this machineiis designed and the graduated stop will not be-used, the tubular 'support 89 will then be received 4in the socket 88 in the piston 86.

When the spraypipes are in the intermediate position -as indicated in dotted lines in the same 'figure the spray pipes willbe in position for `quenching rollsof the largest diameter and the graduated stop will thenbeadjusted as' indicated -in" dotted lines'. It willbe understood 'that the graduated stop will be adjusted in quenching rolls'i'which the roll diameters are between 'the' smallest and largest diameters for-which this mal, chine` is designed.; At the end oi the `quenching operation the spray pipes :are swung to the outer position by `exhausting the uid pressure through the pipe l|06 ,at oneI end of the cylinder -82 and admittingitA through the pipe connection |01 at the opposite end o f' said cylinder.

"The internaly quenching .of lthe roll isaccompushed-independent or that for the outer surface,

gs i

of the roll, the fluid supply pipe is indicated by the numeral and is controlled by a valve |09. This pipe extends through the cylindrical casing I near the bottom and has its inner end threaded into a coupling box .`IIO located just below thedash pot.- A vertical pipe III has its lower end threaded into the coupling box H0 and extends up through the dash pot and the tubular center 30 to the top of the roll where it is perforated as at H2. As the bore of the roll .is closed at the top by means of a plate disk, the quenching fluid is discharged through the perforation H2 and flows downwardly between the pipe III and-the surface of the bore of the roll through the tubular center 30 and dash pot and is discharged at the lower end of the dash pot and then passes through the exhaust tube 1. The openings for the passage ofJ the pipe I I I through the tubular center 30 and the dash pot aresomewhat larger than said pipe to allow the quenching fluid to be discharged therethrough.

The internaldiameter of the tubular center'30 is adjusted so that the bore of the roll will always beA full of water moving with such a velocity that steam formation is prevented. c

As this machine is designed for use in quenching rolls of large diameter and considerable length s uch, as the work rolls for strip, plate mills or the like, the quenching tank is of considerable-height it is therefore necessary t'o have vertically ex-v tending ladders II3 secured to the inside of the cylindrical casing I for the purpose of enabling a workman to climb up inside the quenching tank for inspection, adjustment-of the parts, or making repairs, the workman entering the. tank through a man hole IM located near the lower `end of the cylindrical casing I which is normally kept closed.

Having thus lgiven the foregoing general. and detailed 'description of my invention I will now describe the operation:`

A roll to be quenched is iirst heated to the desired temperature in' a furnace suspended bythe hanger 45 and then transferred by means of the hanger to the quenching machine andv suspended from the turntable 31 with its lower end supported by the tubular center 30 and the dash pot. Assuming that the smallest sized roll for which this machine is designed is being quenched as 'indi-f cated in full lines in Fig. 6. and the quenching iiuid is flowing through the-supply pipes 5 and |08 for the external and internal quenching-respectively for the roll I2, and simultaneously ad; mitted into pipe |06 to the fluid pressure cylinder 02 thereby holding the piston 88 against the grad- ,uated stop end ofthe said cylinder vand the swingof the motor -55 and the gearing connections. The

motor 56 can be driven at variable speeds,which will permit heat transfer ratefrom both internal and external surfaces being controlled and varied during the quenching period in such a manner as to produce vthe desired hardness proportional to the tangential stresses developed in service. The spray nozzles for the external-quenching of the roll surface produce vertical sheets of cooling iluid of adjustable height and thickness, while inl the internal quenching the 'cooling fluid is ad'- mitted at the top of the bore of the roll and flows external quench. a The quenching fluid preferably used in my maand is nally discharged together with thecooling fluid for the external quench through the tube 1 at the lower end of the machine.`

After the quenching operation the flow of quenching fluid is turned oif from the pipes 5, |00 and |08 and admitted in pipe |01 thereby sliding the plunger 8 4 to the opposite end of the cylinder 82, the vspray pipe will then b'e swung to the outer position as indicated in dotted lines in Fig. 6. Y

If it is desired toquech rolls of the largest diameter for which this machine is designed,y the graduated stop 00 is set to the position indicated in dotted lines in Fig. 6, 'the pressure is cut'oif from pipe I01 to the cylinder 82- and then admitted into pipes 5, |06 and |08, the spray-pipes willv then be swung to the intermediate position indicated in dotted lines and the operation will be repeatedas above described. Rolls between the smallest and the largest diameters l may be quenched in a similarmanner by setting the graduated stop 90 at thejvrequiredgpoint to swing the' spray pipes-into the proper position and angle to quench the roll. Y. I preferably perform the internal and external quenching operations simultaneously and continuouslybut independently of each other' to the completion of the operation. but my machine is A pluralitybf spaced nozzles for the same purpose as the quench is more uniform. When a roll is quenched -by submersion the cooling action is iinperfectly controlled. This can be accomplished to the best advantage with my machine which will permit of varying the pressure of the quenching fluid, varying the angle of incidence -of the external sprays, varying the speed of rotation of the'roll which changes the relative velocity of the sprays, changingv the rotation of the roll which chine will be water but I may use other quenching mediums for the internal or external quench such .as oil, chemical solutions, air or gas which may be the same or'diiferent temperatures if I so desire.

I may also with this machine provide means for simultaneously quenching the surface and bore of the cylindrical-objects and then temper such objects by lforcing a preheated fluid through the spray p ipes thereby hardening and tempering the object in the same machine.

Although I have shown and described my in.- vention in considerable detail, I do not wish to be limited'to the exact and speciilc details shown and described, but may use such substitutions, modifications or equivalents thereof, as are embraced within-the scope of my invention, or as pointed out in the claims.

Having thus described my invention what I" clatirix; as new and desire to secure by Letters Paten Y 1. In a machine for hardening a heated metal object, a turntable for suspending and supporting the upper end of aheatedobject, 'yielding means for supporting the lower end,l of .the object, means for rotating the turntable torotate the object with the yielding means, and means for quenching the object by a continuous sheet spray.

2. In a machine for hardening a heated metal object disposed in a vertical position, a turntable for suspending and supporting the upper end of a heated object, a dash pot having a spring mounted therein for resiliently supporting the lower end, of

the object and adapted to rotate therewith, means means for rotating the turntable, means for ap-v plying a quenching fluid to the surface ofthe object in a continuous sheet of spray, andmeans 'for laterally adjusting the position of4 the sheet spray.

4; In a machine for hardening rolls or the like,

j a turntable having means for suspending and supporting the upper end of the heated roll disposed in a vertical position, yielding means for supporting the lower end of the roll; means for rotating the turntable, and means for applying a quenching uid to the surface of the roll in a continuous sheet of spray.

5. In a machine for hardening rolls or the like, a turntable for suspending and supporting the upper end of the heated roll disposed in a vertical position, a dash'pot for yleldingly supporting the lower end of the roll, means for rotating the turntable with the roll, means for applying a quenching uid to the surface .of the rotating roll -in a plurality of continuous sheets of spray, and means for laterally adjusting the position of the sprays.

6. In a machine for hardening rolls or the like, a turntable having means for' suspending and -supporting the upper end of the heated roll, a

7. In a machine for hardening rolls or the.

like. comprising a turntable having means for engaging and supporting the upper end of the heated roll, a' dash pot at the lower end of the y roll, a sleeve rotatably mounted inthe dash pot, l

a center mounted in the sleeve for engaging the lower end of the roll, means for rotating the turntable with the roll. and means for applying a quenching uid to the surface of the roll in continuous sheet sprays.

8. In a machine for hardening rolls or the like,

I comprising a turntable having means for engagingand supporting the upper end of the heated roll in a vertical positionyan ladjustable spider at thelower' end of the roll having aj'central hub with a cap extension, a vertically movable plunger mounted inthe hub, a sleeve. rotatably mounted in the plunger. a center mounted in the sleeve for engaging the lower end of the roll,4 means for rotating the turntable with the roll, and means for spraying the roll withl continuous sheets of quenchingfluid'which extend the full length of the surface to be hardened.

9. In a machineifor hardening rolls or the like, comprising a turntable having means for engaging and supporting the upper end of the heated roll in a vertical position, an adjustable spiderat the lower end of the roll having a central hub with a cap extension, a vertically movable lplunger mounted in the hub, a spring interposed between the plunger and the head of the cap, a sleeve journaled in anti-friction bearings in the plunger, a center mounted in the sleeve for engaging the lower end of the roll, means for rotating the turntable with the roll, and meansffor spraying the roll with continuous sheets of quenching fluid which extend the full length of thesurface to be hardened. l0. In a machine for hardening rolls or the like having a central bore, comprising a turntable having means for engaging and supporting the upper end of the heated roll, a dash pot at the lower end of the roll, a sleeve rotatably journaled in the dash. pot, a tubular center mounted in the sleeve adapted to extend -above the sleeve and project into the bore ofthe roll, a collar on the center for engaging the lower end of the roll, means for rotating the turntable with theroll, Aand means for spraying the roll with continuous sheets of quenching fluid which extend the full length of the surface to be hardened.V

11. In a machine for hardening rolls or the like having a' central bore, comprising a turntable 30 having means for engaging and supporting the upper end ofthe heated roll, a dash pot`at the lower end of the roll, means for vertically adjusting the position of the dash pot, a tubular centering device mounted in the dash pot for supporting the lower end of the roll., a couplingv box adjacent to the dash pot, asupply pipe connected to the coupling box, a tube connected to the coupling box and adapted to pass through the dash pot and centering device in spacedrelation 40 therewith-and extend to the upper end of the bore of the roll, a perforation in the upper end of the pipe, means for rotating the turntable with the roll, and means for spraying the roll with continuous sheets of quenching fluid which extend the full length of the surface tobe hardened. 12. In a machine for hardening rolls or the like,`comprising a turntable having means for engaging andr supporting the upper end of the heated roll,.a dash pot having a centering device ymounted therein for supporting the lower end of the roll, spray pipes mounted adjacent to the side surface of the roll, and means for swinging the -spray pipes laterally.

13. In' Va machine for hardening rolls or the like, comprising a turntable having means for engaging and supporting the upper end ofthe heated roll in a vertical position, a dash pot having a centering device mounted therein for centering and supporting the lower end of the roll, vertically arranged spray pipes mounted adjacent to the side surface of the roll, stand pipes yist ' for`supporting the spray pipes, and means for rotating the stand pipes to swing the spray pipes laterally of the roll.

14. Ina machiire for hardening rolls or the like, comprising a turntable having means for engaging-and supporting the upper end oi the heated roll in a vertical position, adash pot having a centering device mounted therein for ceni tering and supporting the lower end ofthe roll,

' vertically arrangedspray pipes mounted adjacent to the side surface of the roll, a vertically extending slt formed in each spray pipe adapted to form a spray nozzle, means for adjusting the width andA height of each spray Jetfin relation to the roll surface, means for adjusting the angle of the spray nozzle, stand pipes for supporting the spray pipes, and means for rotating the stand annular track 'having means for engslna and supporting the upper end of the heated roll, a

` dash pot having a centering device mounted pipes to swing the spray pipes laterally of the' roll.

15. In a machine for hardening rolls or the like, comprising a cylindrical casing, spaced annular rings and vertically extending flanged bars for reinforcing the cylindrical casing, a distributing chamber formed at the-lower end of the cylindrical casing,- an exhaust tube extending through the central portion of the distributing chamber, an annular track secured to the top of the cylindrical casing, a turntable having means for engaging and suporting the upper endl ofthe heated roll in a vertical position, a dash pot having a centering device mounted therein for centering and supporting' the lower end of the roll, vertically arranged spray pipes mounted adjacent to the side surface of the roll, and means for swinging the spray pipes laterally of the side surface of the roll.

16. In .a machine for hardening rolls or the like.

comprising a cylindrical casing, a distributingv chamber at the .bottom of thecylindrical casing, means for supplyingquenching fluid to the distributing chamber, a tubular exhaust pipe extending' through the distributing chamber, an'

annular track mounted on thetop of the cylindrical casing, a turntable'mounted on the annular track having means for engaging and supporting the upper end of` the heated roll in a vertical position, a dash pot having a centering device mounted therein for centering and supporting the lower end of the roll, stand pipes communicating with the distributing chamber, a

spray pipe connected to each-stand pipe and supportedthereby adjacent to the side surface vof theroll, and means for swinging the spray Pipes laterally.

im. 1n a machine for hardening roue er the e like, comprising a vertically disposed cylindrical casing, an annular track mounted on the top f the cylindrical casing, a turntable 'mounted on the track havingmeans .for engaging and sup` porting the upper end of the heated roll, a dashr pot having a centering device mounted therein for supporting the lower end of the roll, a distributing chamber in the lower end of the cylindrical casing, a pipe for supplying quenching fluid to "the distributing chamber an exhaust tube extending through the distributing chamber, stand,

pipes communicating with the distributing cham- `heated roll, a dash pot having a centeringY device ber, a spray pipe connectedto lea'chstand pipe and Supported thereby adjacent to the side surface-of the roll, and means for rotating the stand pipeszto swingthe roll.

, 18. I!!v a machine for hardening rolls or the like, comprising a turntable having means for .spray pipes laterally of the engaging and supporting the upper end of the mounted therein for supporting the lower end ofthe roll, means for vertically adjusting4 the position .of the dash pot, spray pipes ,disposed adjacent to the side surface of the roll, a stand pipe for supporting each spray pipe, a coupling l the spray pipes laterally of the roll.

connecting each stand pipe with a spray pipe, and means for rotating the stand, pipes to swing i9. Infe. machine ier hardening roue or the like, comprising a vertically disposed cylindrical casing, an annular track mounted. on top of the .cylindrical casing,a turntable mounted on the therein for supporting the lower end of vthe roll,.

spray pipes mounted. adjacent to the side surface of the roll, a stand pipe for supporting each spray pipe, an arm attached `.to each stand pipe, means for connecting the arms together, .and means for rotating the stand pipes-simultaneously to swing the spray pipes laterally of the roll.v

20. In a machine' forI` hardening ,rolls or the like, comprising a vertically disposed cylindrical casing, an annular track mounted on top of theattached to... the cylindrical casing, a plunger mounted thereinfor engaging'oneof the extending arms-attached to one ofthe stand pipes, fluid pressure means for reciprocating the plunger to swing the 'spray' pipes laterally of the side surface of the roll, and a graduated stopfor limiting themovementof the plunger. Y

21, In a machine for hardening rolls or the like, comprising a vertically disposed cylindrical casing,.vertical and transverse reinforcing means for the cylindrical casinghavdistributlng chamber formed in the lower end. of the cylindrical casing, a pipe for'supplying quenching fluid to the distributing chamber, any exhaust pipe extending through-the distributing chamber, van annular track mounted on top of thev cylindrical casing,

a turntable mounted on the'annular track hav-- ing means for engaging and supporting` the upper end of the heated roll," a dash pot at the lower end ofthe roll, a centering device rotatablyl mounted in the dash pot for supporting the lower endl of the roll, al plurality of stand` pipes connected to the distributing chamber.; aspray pipe supported by each stand pipe adjacent to the side surface of the roll, and, means for rotating the stand pipesto swing the spray pipes inwardly or. outwardly from the side surface of the roll.'

`22. Ina machine for hardening .rolls or the like having a central bore, a turntable having means forengaging and supporting the upper end of a heated roll disposed in a vertical `position, a rotatably mounted centering device adapted to support the lower end of the roll,fmeans for rotating the'turntable with the roll, means for admitting quenching fluid at the top end of the bore of the roll, spray'pipes adjacent to the outer surface of the rolll each having a vertical slot adapted to form' a nozzle' to play *a sheet of quenching fluid on the roll.

23. In a machine, for hardening-.rolls or'the like having a central bore, a turntable having means for engaging aid supporting the upper end of a heated roll disposed in a vertical position, a centering device adapted to rotate for supporting the lower end ofthe roll, means for/rotating the lturnta-ble'with theroll, means. for. Vadmitting quenching uid at the top end'of the bore of the roll and advancing it to the opposite end of the roll, sprayvpipesadjacent to the outer surface of the roll each having a vertical slot adapted to form anozzle to play a sheet of quenching duid o`n the surface of the roll, and means for adjust- `ing the outer surface of the roll by al plurality of ing the width and height of the slots in the spray pipes forming the nozzles.

2 4. In a machine for hardening rolls or the vlike having a central bore, a turntable having means for engaging and 'supporting the upper end of a heated roll* d-isposed in a vertical position, a centering device adapted to rotate for supporting the lower end of the roll, means for vertically adjusting the centering device, means for rotating the turntable with the roll, means for admitting a quenching fluid at the top end of the bore of the roll and advancing it during the rotation of the roll to the opposite end of the roll, a plurality of vertically disposed spray pipes adjacent to-the outer surface of the roll each having .a vertical slot adapted to form a nozzle to play a sheet of quenching fluid on the'surface of the roll, adjustable strips for increasing or decreasing the width of theslot forming the nozzle in each spray pipe, bars clamped to the strips for adjusting the length .of the nozzles, and means for swinging the spray pipes laterally of the roll surface. y

25., In a machine for hardening rolls or the like `having a'central bore, a turntable having' means for engaging and supporting the upper end ofa heated roll disposed in a vertical positioma centering device adapted to rotate for supporting the lower end of the roll, means for vertically adjusting the centering device, means for rotating the turntable with the roll, means for admitting' a quenching fluid atthe top end of the bore of the roll and advancing it during the rotation of the rollto the opposite end of the roll. a plurality of vertically disposed spray pipes adjacent to the outer surface of the'roll each having a vertical slot adapted to form a nozzle to play a sheet of quenching fluid on the surface of the roll, means for adjusting the spray pipes to adjust the angle .of the nozzle in relation to the roll surface, a stand pipe connected to each spray pipe, and

means for rotating the stand lpipes to swing the l spray pipes laterally of the roll surface.

26.In a machine for hardening, rolls 'or the like having a central bore, rotating means for supporting the upper end of the heated roll disposed/in a vertical position, yielding meansvfor supporting the lower end of the heated roll and adapted to rotate therewith, means foradmitting a quenching iiuid at one end of the bore of the roll and advancing it to the opposite end of the.' roll, and means for quenchingthe outer surface of the roll by a plurality of sprays, in sheet formation which strike the roll at substantially a` tangential angle and extends continupusly the entire length of the surface to be quenched.

27. In a machine for hardening rolls or the v*like having a central bore, comprising a vertically disposed cylindrical casing, an annular track mounted ony top of the cylindricalcasing, a turn-l table /mounted on the annular track adapted to engage and support the upper. end ofthe heated roll, a dash pot at4 the lower end of the cylindrical casing, a centering device rotatably mounted in vthe dash pot for supporting -the lower end Aof the roll, a coupling box adjacent to the lower end of the dash pot, a quenching fluid supply pipe connected to the coupling box, a vertically disposed pipe connected to the coupling box adapted to extend through the dash potand centering de- 76 of the roll, and means for `sinl'ultaneously quenchsprays in sheetformation.

28` In a machine for hardening rolls or the like, comprising a vertically disposed cylindrical casing, an annular track secured to the top end ofK the cylindrical casing, a' turntable mounted on the annular track adapted to support the upper end of the heated roll, a dash pot at the` lower end of the roll, a centering ldevice mounted in the dash pot adapted 'to support the lower end of the roll; means for rotating the turntable with Athe roll, and a plurality; of vertically arranged spray pipes each having a slot forming a nozzle adapted to play a 'quenching fluid on the surface tobe treated.

29. In a machine for hardening rolls or the like, comprising a vertically disposed cylindrical casing, a distributing chamber formedwithin the lower end of the cylindrical casing, a pipe for supplying quenching fiuid to the distributing chamber, an annular track secured to the top end of the cylindrical casing, a turntable mounted on the annular track adapted to support theupper end of the heated roll, a dash pot sup' ported fromthecylindrical casing atthe lower end of thev roll, a centering device mounted in the dash pot adapted to support the lower end of the roll, aplurality of vertically arranged stand pipes having their lower ends `connected to the tributing chamber, a spray pipe connected to and supported by each stand pipe adjacent to the surface ofthe roll, and means for rotating the stand pipes to swing thespra'y toward or awayl from the surface ofthe roll.

30. In a vmachine for hardening rolls or the like, comprising avertically disposed cylindrical casing, a distributing chamber formed -within the lower end of the cylindrical casing, a pipe for supplyingquenching fluid to the distributing chamber, means .for supporting the opposite ends of the roll, means for rotating the roll aboutits longitudinal axis, a plurality yof glands formed in the wall of the distributing chamber, a stand pipe having one end journaled in each gland, a journal bearing for the opposite end of each stand pipe secured to thev cylindricalcasing, aspray pipe disposed adjacent to the Vside surface of the roll connected to and supported by each stand pipe,

and means for rotating the stand pipes to swing ing a heated roll, spray pipes disposedA adjacent to the side surface of the roll, a distributing chamber for receiving .quenching fluid, a stand lpipe connected to the distributing chamber for spray pipe,- an. arm extending from each stand pipe. and means connected to the' arm adapted to rotate the stand pipes fto swing the spraypipes'- 'toward or away'from-the side of theroll surface.'

33. Inv a machine for hardening rolls vor the like, comprising means for supporting and rotating theheated roll, spray pipes disposed adjacent to the side surface of the roll; a distributingA roll, meansfor rotating the turntable with the supporting and Supplying quenching fluid toeach f nume;

chamber for receiving quenching fluid, a stand pipe connected, to the distributing chamber' for supporting and supplying quenching fluid to eachspray pipe, an arm extending from each stand pipe, adjustable -connections between the arms,

a fluid pressure cylinder having a plunger mounted therein forengaging one of the arms, andmeans for reciprocating the plunger to rotate the stand pipes andswing the spray pipes toward or tendingl therefrom, adjustable links and bell crank levers-for connecting the arms, a fluid pressure cylinder having a plunger mounted therein fo'r-` engaging one ofthe arms, fluid pressure means for reciprocating the plunger i'.o iotateI the`stand` pipes 'simultaneously and swing 'the spray'. pipes y toward'or away from the side surface of theroll,

and a graduated stop adapted to limit themovement of the'swinging spraypipes.

- surfacev lif the roll.

5o 'l like, comprising a vertically disposed cylindrical 35, In a machine for hardening rolls or the like,`comprising a vertically disposed cylindrical casing,'an annulartrack secured to the top of the cylindrical casing, a turntable mounted on the annular track',` an opening formed centrally .in the turntable, a downwardly extending flange surrounding the opening having an inclined seating surface, -a hanger having a head lformed with an-inclined seating surface for engaging .the seatings'urface of the flange, an annularringat-` tachedto. the head-ofthe hanger for engaging and supporting the upperend of a heated'roll.- 'a centering device for supporting the lower -end of the roll, spray pipes each having avslotforming al nozzle adapted/toplay a sheet of spray on the roll at an angle to the side surface,vand a motor adapted to be driven'at a variable speed for rotating the turntable to i'otat'e the roll either with or against the direction of the-spray on the 36. Ina machine for hardening rolls or the casing, an annular track secured tothe top-'ofv "extending T-bars having their flanges tofthe inside of the cylindrical casing with their legs extending inwardly, perforations formed in the' legs of the T-bars, an adjustable spider 'having arms at the lower en'd ofthe roll, perforationsr.

- the cylindrical'casing, 'a turntable mounted on the intheoutenends of the arms of the spider adepti' forations in the ends of the arms of the SpSler pot for supporting'thelower end of the roll, means for rotating the turntable with the roll, and .spray pipes' disposed adjacent to the side surface of thev roll.

1ike,gcomprisirig. a vertically'disposed cylindrical .37.'I'n a machine forhardening rolls or the casing, an annular 4track secured to the upper ed onthe annular Atrack having means for supporting the upper end of the heatedaoll. a centering device for supporting the lower end of the roll;- a distributing chamber within the lower end of the cylindrical'casing, glands formed inthe -upper wall ofthe distributing chamber, a plurality of vertically extending stand pipes eachl having its lower end journaled in onev of the glands, a

stubshaft projecting from the upper end of each' stand pipe each journaled in a bracket attached to the sidewall of'the cylindrical casing, a spray pipe coupled to the upper -end of each stand pipe, M

a bracket arm extending from each stand'pipe having a-socket formed at itsl outer end for Isupporting the lower end of each spray pipe, an-arm metal-body which consists in taking the.` cylin- ,v

dricai ,meicibcdy whiennas been heated tc the lrequired temperaturasuspending the cylindrical metal body 'from the tpin 4a vvertical position' resiliently supporting the lower end of the cylindrical metal body insuch a manner as to allow for contraction, and then rotating the cylindrical metal body about its longitudinal axis between a plurality of continuous ,sheet sprays of quenching uid which strike the cylindrical metal `body at a substantially tangential angle to its surface.

39. Themethodof hardening .a cylindrical f the required temperature, suspending the cylin.

drical metal body fromnthe top ina, vertical position, centering and resiliently ,siipporting thelowf .i

er end `of the cylindrical-metal body in such a manner as to allow for contraction, then rotating v the cylindrical metal body between a plurality of'fsprays of quenching fluid winch stri'kelthe cylindricalrmetal body in a continuous' sheet', and

then subjecting the central bore of the cylindrical metal body to the action of a. quenching fluid as it passes'through the central bore of the .cylindrical metal body.

4o. The nieuwe cr hardening rcilnaving e;

` I lcentral bore, which consists in taking a roll heated tothe" required temperature, suspending the roll. from -the'topdn a verticall position, centering and-resiliently supporting the lower end ofthe roll to allow'for contraction, rotating 'the roll about its icngitudinsiaxis between s. piuraiity ci' sheet sprays of quenching fluid-which strike the o uter surface of'the roll at substantiallya 'tan-.'- gential. angle in a continuous sheet fr'om one end so; the roll surface to be quenchedto the other. and simultaneously admitting a quenchinguid atV the top end of the central bore of the roll and advancing it to the opposite end of the roll.

41..-The method of hardening rolls or thelike g the roll'fron the top in a'vering the lower end of the rollin such a manner as -to allow for contraction, rotating the roll on itsI longitudinal axis while holding it at opposite ends.

v applying a quenching fluid to the rotating heated `roll byl means of a plurality of continuous sheet ,having 'a central bore, consisting in heating the roll tobe hardenedtoaprdetermined temperature, suspen tical pcsiticm centering and resiiienuy suppcri-.

sprays Whichextend the entire length of -the A surfacev to vbe quenched and strike the roll at anangle tozsaid .roll surface, and simultaneously end of the cylindrical casing, a turntable mount'- treatin'g the boreof the roll from end to fend by u imanes a quenching fluid movingv with such velocity that vapor formation is prevented.

42.' The method of hardening a'roll having a central bore.. which consists in irst heating a rll to a predetermined ,teniperaizurey suspending the roll from the top in ,a vertical pos'ition.'cen' tering and, resiliently supporting the lower end of the roll in such a manner as to allow for contraction, then rotating the roll about its longitudinal axis, treating the bore of the roll with a rapidly moving quenching uid, simultaneously quenching the surface of the roll independently of the internal quenching operation by means of spraysv of sheet formation extending the full length of the surface of the roll being quenched. and controlling the internal and external treatl ment by varying the quenching period.

GEORGE J. BUCKNER..