US2369684A - Rolling mill construction - Google Patents

Description

Feb. 20, 1945. L, w NASH Em 2,369,684

ROLLING MILL CONSTRUCTION Filed Jan. 13, 1942 5 Sheets-Sheet 1 INVENTOR. LEONARD W. NASH- CHARLES W. WILLIAMS.

ATTORNEYS Feb. 20, 1945.

L. w. NASH ETAL ROLLING MILL CONSTRUCTION Filed Jan. 13, 1942 5 Sheets-Sheet 2 INVENTOR LEONARD w NASH BY CHARLES W. WILLIAMS.

Feb. 20, 1945. .'w. NASH ETAL I ROLLING MILL CONSTRUCTION 5 Sheets-Sheet 5 Filed Jan. 13, 1942 INVENTOR. LEONARD w NASH and CHARLES w. WILLIAMS ATTORNEYS L. w. NASH E 2,369,684

ROLLING MILL CONSTRUCTION Feb. 20, 1945.

5 Sheets-Sheet 4 Filed Jan 13, 1942 a; "T w u ((7/ 72 m5 Fl G. 7

INVENTOR.

LEONARD W NASH. CHARLES W. WILLIAMS ATTORNEYS.

Feb. 20, 1945. 1.. w. NASH ETAL 2,359,634

ROLLING MILL CONSTRUCTION Filed Jan. 15, 1942 5 Sheets-Sheet-S II II! 1N VENTOR ATTORNEYS Y BY J ',,&M,

F 'G' MJhM/JW Patented F eb. '20, 1945' ROLLING M LL CONSTRUCTION Leonard W. Nash, Salem, ,and. Charles W. Williams, Shaker Heights, Ohio, assignon to E. W. Bliss-Company, Brooklyn, N. Y., a corporation of Delaware Application January 13, 1942, Serial No. 426,852 21 Claims. (Cl. 8055) 'The present invention relates-to rolling mill machinery-and the like employing two or more work rolls and is particularly directed to a rolling mill construction in which such rolls are of large size and are used in hot and cold working of various metals, such as steel and non-ferrous metals and alloys. The invention is adapted for use under conditions where the rolls are subject to end thrust as well as to radial bearing loads.

Such constructions embody two or more work rolls which are so situated with respect to each other that the space allowed for the supporting bearings is restricted in size. This space limitation require that the bearings shall be small enough to permit ready cooperation of the rolls as well as to permit enclosure of the bearings and checks within roll windows. At the same time the parts must possess sufllcient strength to the harmful presence of impurities or water, increases the usual fatal effect such foreign materlal has on the bearings and the bearing opersupport the very high total loads encountered in such equipment.

The bearing capacity which is required in such mills has been steadily increased as larger and v larger mills have been built and a principal deterrent to the construction of large mills has been the difliculty in obtaining a bearing and chock construction which will be small enough to be accommodated within the available space and yet strong enough tohandle the imposed loads.

In providing a bearing construction for a pair of cooperating rolls it is desirable, in the interests of maximum efficiency, to have a roll neck and bearing construction which, in strength, approaches as closely as possible to the strength of the roll body itself. This means that while the roll neck should not be decreased in diameter sufilcient to weaken the total be'am strength ofthe roll it must still be small enough to permit the use of a bearing construction which can of itself handle the loads imposed on the roll. The present inventionprovides a rolling mill unit in which the maximum strength is provided both for the bearing and in the roll neck, by permitting the neck to have a large diameter, so that the strength of the roll body may not be appar-,

ently greater than the strength of its supporting parts.

Rolling mills are usually employed in surroundingswhere dirt, metal scale and water are present, all of which tend to find their way between the bearing surfaces. Such surfaces are carefully finished and operate with a minimum clearance between the parts for the accommodation of the oil film. Since the bearin loads are high there is a resultant tendency for lubrication films to break down. This tendency, accentuated by ation.

A further source of trouble in rolling mills and their bearings arises from scoring of the bearing surfaces when the rolls are placed within or removed from their, supporting bearings and chocks. Furthermore each time the packing seals are removed and replaced they are stretched and ma short time leakage develops where a tight seal is required. An additional source of trouble is encountered when rolls are removed from a mill and taken to a roll shop for body dressing. In dressing a roll body tiny particles of the roll surface are ground 01! and become mixed with various impurities to form a fine dust which often finds its way to the bearing surface of the roll neck. Even with the utmost care it has been diflicult to clean the necks properly before reassembly, in which case the dust deposit from the roll dressing would act on the surfaces like an abrasive with a consequent harmful ffect.

The general object of the present invention has been to provide within the restricted space available'a bearing construction of adequate strength which will at the same time permit the use of a roll neck of maximum diameter to correspond with the roll body. A further object of the invention has' been to provide a construction in which the actual bearing surfaces may be sealed against the ingress of foreign matter either when "bearing of the plain sliding type which is-free of the disadvantages heretofore encountered in plain bearings and which is also free of the disadvantages encountered when roller or ball bearings are employed. An additional object of the invention has been to provide an improved thrust bearing construction which is likewise of the plain sliding type, as distinguished from roller or ball bearing constructions, and which possess a simplicity of construction heretofore unknown. Still another object of the invention has been to provide a rolling mill embodying chocks, bearings and rolls in which the various parts may be disassembled with respect to each other simply and with a minimum amount of efiort. To the accomplishment of the foregoing and related ends, said invention, then, consists of the means hereinafter fully described and particularly pointed out in the "claims; the annexed drawings and the following description setting forth in detail certain mechanism embodying the invention, suchdisclosed means constituting, however, but one of various forms in which the principle of the invention may be used.

In said annexed drawings:

Fig. 1 is a front elevation of our improved mill;

Fig. 2 is a side elevation of the same;

Fig. 3 is a vertical section through the mill showing the frame members in section;

Fig. 4 is a section in arplane passing through I the axis of a roll showing one end thereof with its associated bearing and chock construction;

Figs. 5 and 6 are sections through Fig. 4 as indicated by the lines 5-5 and 6-8 respectively thereon;

Fig. 7 is an enlarged detail of the sealing mechanism in the same plane as Fig. 4;

Fig. 8 is a modification of the construction shown in Fig. 4 employing different sealing means;

Fig. 9 is a section through Fig. 8 as indicated by the lines 9--9 thereon; and

Figs. 10 and 11 are sections through Fig. 9 as indicated by the lines 10-40 and ll-l I, respectively.

Referring now to Figs. 1, 2 and 53 there is provided a foundation it on which are bolted a pair of uprights I1 and I8 joined at their top by crossbars 20. At the top of the uprights are power operated screw downs 22 connected as at 24 for synchronous operation under the influence of a pair of electric motors 25. Each of the motors drives a respective screw down in a known manner to rotate a screw-down bolt 30 (Fig. 3). The screw-down bolts control the pressure between the rolls 35 and 35.

In the present application our mill is shown as employing two rolls. It will be understood, however,.that we contemplate the use of the inventio'nrin 'any type of mill equipment including the so-c'alle'd four-high mill or a mill which employs cluster; rolls to back up the work rolls.

The screw-downs are threadingly received in bushings 38 ineachT' f the cross-members at the top'of respectiv'eguprights and thrust exerted by the screw-downs is received by the bottom of the uprights at the space defining the roll windows. Thus, the side members 40 of the uprights are placed in tension when the rolls 35 and 36 are active.

The rolls are driven in the usualmanner from a suitable source of power acting through couplings l2 and 43 to drive the upper and lower rolls.respectlvely.

Chocks which receive the bearings and the rolls shown in Fig. 4. Accordingly, illustration and description of this latter mechanism will suffice for all four chocks except as will be pointed out hereafter.

Referring now to Fig. 4, the roll 35 is shown as consisting of a body 55 and a roll neck 51 which terminates at 88 in a member forming a connection with the coupling 42 (Fig. 1). The roll neck is of a stepped construction with one portion indicated at 80 finished to provide a radial bearing and another portion indicated at 62 adapted to support a thrust collar and bearing.

As the load of rolling is applied to a roll the same acts like a beam loaded at the center and supported at the ends. Thus, while the greatest cross-sectional strength is required near the middie of the body it is very desirable to use roll necks of suiiicient diameter to correspond with the strength of the body to provide a structure of maximum efiiciency. To provide this maximum possible roll strength the neck 51, forming the bearing surface 60, is of a diameter as close as possible to the diameter of the roll body 55. This portion of the neck is cylindrical as shown in the drawings and is highly finished, as by grinding; to provide a smooth, plain sliding hearing surface.

The roll neck is received in a tapered sleeve 65 forming a part of the chock assembly which is generally indicated at 41.

The tapered sleeve 65 is thickest adjacent the roll body and tapers away to a point of minimum thickness farthest from the roll body. The taper is provided only on the exterior-of the sleeve and the interior is formed as a cylinder to receive the roll neck bearing. To this end the said interior cylindrical surface is coated with a suitable bearing metal in order that a minimum of sliding friction may be present between the two faces.

To receive and support the bearing sleeve an internal taper is provided in the chock 41 corresponding to the external taper of the sleeve 65 in such manner that the sleeve and chock may be are mounted within the roll windows indicated at 45. In the construction shown each window receives an upper chock 41 and a lower chock l8, each of which is mounted in a clamp 50 which functions to prevent lateral motion of the chocks. Clamps 50 are supported on boss 52 projecting from the uprights 40. As pressure is applied, each I of the screw-downs acts through a pad 54 to load the chocks, bearings and rolls for the rolling operation.

A chock and bearing assembly to be used connection with the left-hand neck of the roll 35 (Fig. 3) is illustrated in Fig. 4. The chock and bearing construction at the opposite side of the roll 35 will, except for reversal of the parts, be identical with that of Fig. 4; a thrust bearing may or may not be used at that side of the mill. The chocks and bearings, as well as the roll necks of the roll 36 are in all important particulars identical with similar parts of the mechanism tightly telescoped with each other. When they are in that position, as shown in Fig. 4, the sleeve, for practical purposes, becomes a part of the chock and the two together provide a solid support for the roll neck journalled within the sleeve. The load thus transmitted is a result of the screw-down pressure on the pad 54 which rests on topof the chock against the surface 66.

To prevent any possibility of relative rotation between the sleeve and the chock in their assembled position a key III is provided which is effective at the time assembly is completed to lock the two parts together. There is also provided an annular seal 12 (Fig. 7) to prevent leakage along the fitted tapered surfaces. This isespecially desirable because of the manner of lubrication which, as will be hereafter pointed out, calls for the presence of oil along part of these fitted surfaces.

The tapered sleeve, once fitted to the roll, re mains on it even when the mill is taken down unless it becomes desirable to work on the actual radial bearing surfaces themselves. Thus at all times these surfaces are protected and form a part of the roll unit itself, being removable with the roll when it is taken out of the chock.

To take care of the end thrust which occurs on the rolls during the operation of the mill a thrust bearing mechanism is provided which forms a part of our invention. This is mounted within the chock 41 in a cylindrical bore '15 shown at the left-hand side of Fig. 4. The stationary part .collar 38.

v 2,389,884 of the thrust bearing'comprises a pair of bearing rings 33 and 3|, to each of which a second ring, 32 and 03 respectively. is tightly secured.

Each of the rings is provided with a series of cylindricai pockets spaced annularly about the ring periphery and so positioned that the pockets of one ring face the pockets of the other ring. The axes of the pockets are parallel with the roll axis. Each pocket receives a circular, thrust bearing pad 30 so mounted that the pads of one ring will face the pads of the other ring at'a distance determined by-the spacing of thetwo rings.-

Behind each of the thrust bearing pads is'a substantially non-compressible wafer formed of hard neoprene or a similar material which has, nevertheless, a limited resiliency. Each of these wafers is closely fitted in the ring 32 or 03 as the case may be, and the rings are in turn snugly received by the cylindrical walls of the bearing pockets. The rings 30 and 3| have fiat faces which engage the backside of the various wafers streams to the radial bearing and to the thrust bearing while the spent oil is withdrawn through a common duct. I

The thrust'bearing is supplied with lubricant from a fitting I20 (Fig. 4) through'an elongated oil passage I22. Oil passes from the said passage through radial openings I24 down to the pads of the thrust bearing and the'collar therebetween.

While the upper pads are lubricated from the central openings leading from the passage I22 which deposits oil directly at the point of contact between the thrust collar and the bearing surfaces. oil passes to the lower pads through openings I25 which are provided behind the upper pads and around the collar portion of the thrust ring 03.

The oil distribution is aided by the rotation of to continue each wafer in a cavity whose volume equals that of the wafer at all times.

The thrust bearing proper is provided with a rotating thrust collar which is carried by the,

roll neck and includes a thrust flange or plate which lies between the two sets of bearing pads. The entire device is so arranged that endwise thrust of the roll 33 is limited by virtue of the effect of the pads 30 on opposite surfaces of the collar 00. When the mechanism is assembled as shown in Fig.- 4 the neoprene wafers resiliently back up each of the pads to permit a slight tilting or cooking of. the same, which occurs as soon as the thrust collar rotates and contacts the pads in passing by. The slight suck- 'ing action thus effected causes oil to be drawn in between the surfaces of the pads and the thrust plate so that the well-known wedgeshaped 011 film of a sliding thrust hearing may be obtained.

The collar 30 is indicated in the drawings as keyed at 32 to the roll neck and at one end abuts a shoulder 33 to prevent axial movement of the collar inone direction with respect to the roll.

rection is prevented by a ring 08 which forms a rabbetted connection 03 with the collar. The ring 05 is in turn locked in place by a nut I00 which forces the said ring and the collar against the shoulder 03.

The nut I00 is threadingly Carried by a ring I02 which is made in" the form of two semi-cylinders lying within an annular groove I03 of the roll neck such that in; their assembled position the two half cylinders come in contact with each other at their ends along lines I05. In this position the nut I00 may be threaded thereover. when the nut has been removed the two parts of ring I02 may be taken out of the groove I03, thuspermitting removal of the ring 00 and the thrust collar 30, each of which is slightly less in internal diameter than the threaded diameter of the I32. To lock the ring 00 and the nut III in position with respect to each other one or ,m'orelbolts II 0 are provided which pass through the nut and are threadingly received within the when this assembly is completed the thrust collar is held in fixed position on-the roll neck against the shoulder 33 and locked against displacement from that position.

Adequate lubrication must be maintained between the sliding surfaces of the radial bearing and also between the 'sliding surfaces of the thrust bearing. This is accomplished'by mainw 1 respectively.

collar 90 and the sucking action of the tilting pads above described.

To provide lubricant for the radial bearing surfaces a pair of. oil inlets I30 are provided which are connected, with each other and feed oil to two annular grooves I33 (Fig. 5) formed in the chock 41. Oil travels around 'these grooves to passages I 35 leading between the actual bearing surfaces in the region of minimum load. In the position of the parts shown in'Fig. 5 the maxi- Axial movement of the collar in the opposite dimum bearing pressure between the roll neck and the chock will be adjacent the top. The oil supplied through the passages I35 feeds into a shallow groove I351: formed in the tapered sleeve and extending axially thereof to distribute oil along substantially the entire length of the roll neck.

Since the mill illustrated is a reversing milltwo of these grooves are provided in order that one or the other groove may supply ample oil to the I bearing, depending on the direction of rotation of the rolls. The oil is then pickedup to form the usual lubrication wedge at the point of bearing load and due to the imposed load will be exuded at the endslof the bearing, namely, at the points indicated at I 31 and I38 in Fig. 4. This oil then drifts around the roll neck until it is'in position to pass into the oil outlet passages I40.

The oil outlet passages I40 serve to discharge oil not only from the radial bearing. but also from the thrust bearing; oil travels from the latter to the passages I42 and its horizontal con necting passage I43 into the passages I40. As shown in Fig. 5, several passages I40 are provided and the oil may be removed from them in vented bysuitable packing at each end of the, construction. For this purpose a conventional packing ring I comprising the usual wiper and spring retainer is mounted within an annularv I groove in the end plate I02 01 the chock. Thev oil approach to this packing member is through a labyrinth seal formed at In by annular extensions on the collar 05 and the end plate I 52,

To prevent oil leakage adjacent the roll neck a pair of packing members similar to that just described and designated as 0a are mounted within a cylindrical extension of the tapered ring taining a continuous flow of oil in separate II. In this case the wipers of the packing-rings bear directly against the iinished surface of the roll neck itself. These members prevent leakage of oil adjacent the roll body and insure that oil discharged from the radial bearing will all be directed within the passages I for removal as desired.

To cooperate with rings Illa and further prevent the admission of scale, water or other foreign matter into the bearing a sealing ring I" is provided in the sleeve 05 which is urged by a series of springs I62 against the roll body. At

the region of contact between the body and thering the body is undercut at Ill and the ring I is formed to closely fit the contour of said undercut to provide the desired seal therewith. The ring I68, as indicated, is mounted to slide back and forth axially of the tapered sleeve II and leakage along this sliding surface is prevented by a sealing ring I81 (Fig. '1) similar to that previously described and shown at 12 in the same figure.

A modified form of lubricant seal is shown in the construction of Figs. 8, 9, and 11. In this modified construction a different type of seal is employed on the roll neck adjacent the roll body, as well as between the collar 9! and the end plate 52. The seal at the collar or ring 85 employs the labyrinth members I55 previously described, but makes no use of a packing member like that shown at I 50.

To effect a seal at this point an annular recess I is formed in the member I52 and opens against an annular surface of the collar 85. This opening is connected by a passage I with a vacuum pump to roduce a sucking action in the recess which tends to draw any oil leaking past the labyrinth seal out of the circulation system and prevent its oozing out of the chock assembly near the nut IIID.

A vacuum seal is likewise employed at the other end of the bearing assembly in proximity to the edge of the roll body. As shown in Fig. 8 this seal consists of a cast ring I89 which is integrally fitted to and carried by the tapered sleeve I5. The ring is provided with a pair of annular openings I10 and I12 which are separated from each other by a web" I13. A third annular opening similar to I10 and I12 and designated by referenoe numeral I15 is provided in sleeve 85; a labyrinth sea] I" separates the openings I15 and I'll from each other. Likewise the annular opening I12 is separated from the undercut portion I of the roll body by a second labyrinth seal m. At the same point an outstanding drip ring III is provided which will collect water falling downwardly from the roll and carry it along until it drops oiI down from the assembly.

In order to accomplish the vacuum sealing effect the annular opening I1! is connected by a fitting I83 (Fig. 10) with a passage I" in the chock itself. This passage I85 is in direct communication with a vacuum pump to continuously maintain a sucking action in the annular opening I12 at all points about its periphery.

To maintain a fluid stream through the system under the action of the vacuum pump, air is admitted through an opening I81 at the top of the annular passage I", which opening is capped as at m to prevent impurities from passing within the system'at this point. Additional air enters the system through the labyrinth seal I III by passing around the drip ring III and through the undercut opening I".

By reason of the sealing mechanismiust deamps scribed and the maintenance of a fluid iiow as im dicated, any impurities which can pass beyond the labyrinth seal IIII toward the inside of the bearing are automatically sucked out through the passage I". Likewise, any excess oil which does not drop down through the opening ill to be removed through the conduit I" may possibly find its way along the roll neck surface and beyondth'e labyrinth seal I'Il into the fluid stream which is discharged through the, opening I".

It will be seen that such a sealing mechanism as that shown and described in connection with duced to a minimum because the packing rings eration.

needs not be disturbed with consequent forcing of the rings each time they are removed. This also insures that no scratching of the smoothly finished roll neck will occur because it is not necessary to force packing members, such as ass, off and on again when it is only desired to remove the rolls from the chocks. Furthermore,-

no harm can come to the bearing surfaces of the sleeve or roll neck because they'do not need to be constantly assembled or taken apart.

Disassembly is facilitated by means of the wedging action of a series of bolts I82 spaced about the chock, as shown in Fig. '7. Each of these bolts passes through a flange I94 integral with the sleeve 65 and is threadingly received within an opening I95 of the chock 41. In normal operating position the sleeve and chock are, as shown in Fig. 7, locked together due to the fact that nut I96 pull the two parts together tightly against the taper. When it is, desired to disassemble the parts the nuts I96 are loosened and nuts I91 are tightened against the flange I, thus acting to push the chock loose on the taper of the sleeve 55. When the taper fit is once broken it is a simple matter to remove the chock 'from the assembly, leaving th sleeve intact on the roll neck.

Even after the chock has been removed from the tapered sleeve and neck the seal in and the adjacent seals I" remain unmoved with respect to the roll and tapered sleeve and thus continue to seal the interior of the radial bearing against the ingress of any foreign matter.

Ingress of foreeign matter after the chock has been removed is prevented at the opposite end of the sleeve II by a secondary sealing means. This seal comprises a ring IIIII which is bolted at 2! against a shoulder 20! of the roll neck. In this position it underlies an extending portion of the tapered sleeve 65 and is closely adjacent thereto. A seal is continually effected at this point by a conventional fiber packing 205 which functions to prevent any foreign matter from passing within the radial bearing at this point either when the chock is removed or when the mill is in op- It will be readily understood that the arrangement of ring Ill which is bolted at 2M against shoulder "I also serves to maintain sleeve ll in position on roll neck 51.

It will be apparent that prior to the removal of the chock from the sleeve the nut I00 must first be backed off of thecollar Ii! and the parts Hence, oil leakage at the packing is reaaeaeec members having'the form. of a continuous bearing sleeve whose inner surface forms a radial bearing with a respective roll and means cartion embodied in'the present invention it is possible to employ a cylindrical roll neck whose diameter in its radial bearing portion, in compari son with the diameter of the body is large enough, to permit the neck to absorb within the elastic limits of its'constituent material its proportionate share of the beam lead imposed on the roll. In other words, the present invention permits an efficient roll design in which the strength of the body need not be disproportionately greater than the strength of the necks. Remembering that the bending moment at a particular point on the roll is a product not only of the force applied but also of the moment arm, it follows that for a given load the middle portion of the roll, namely, the

body, should be thicker than the neck portion within the radial bearing. However, the roll body cannot handle its maximum possible loadunless the neck can have a diameter sufiicient to accommodate such a load in its turn.

By the present invention we are able to provide a roll neck of such diameter and thus to permit the utilization of the maximum roll strength which results in a saving of material and an increased load-carrying ability in the entire mill.

From the foregoing description it will be apparent that we have provided an improved rolling mill construction in which the roll and the chock may be separated without exposing the radial bearing surface with consequent dangers of scratching or marring the highly finished roll neck or the soft bearing metal lining of the journal. At the same time we automatically provide for sealing both ends of the sleeve remaining about the roll neck without the requirement of any further act on the part of the workmen than the mere removal of the chock. This is because the ring 200 and the packing 205 are constantly in position and likewise the packing members I50 bearing on the roll neck and the associated ring I80 all cooperate with each other to continuously seal each end of the radial bearing.

Furthermore it will be apparent that we have provided a construction which permits the use of roll necks of the maximum diameter in a construction of simple design which is easy to assemble and disassemble.

Other modes of applying the principle of our invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means stated by any of the following claims or the equivalent of such stated means be employed;

We therefore particular point out and distinctly claim as our invention:

1. In a rolling mill embodying a pair of spaced uprights, roll windows formed in said uprights, chocks carried in each of said windows, rolls carrier by said chocks and adapted to cooperate with each other to perform a rolling operation, means for clamping said chocks against shift in said windows along the axis of said rolls, each of said chocks comprising two separable members adapted to telescope together into a wedging fit along cooperating tapered surfaces, one of said ried by one of said members and reacting on the other member for unwedging said member while permitting the bearing member to remain on the roll neck.

' 2. In a rolling mill embodying a pair of spaced uprights, roll windows formed in said uprights, chocks carried in each of said windows, rolls carried by said chocks and adapted to cooperate with each other to perform a rolling operation, means for clamping said chocks against shift in said windows along the axis or said rolls, each of said chocks comprising two separable members adapted to telescope together into a wedging fit along 1 cooperating tapered surface adjacent the body of the cooperating roll, one of said members-having the form of a continuous bearing sleeve whose inner surface forms a plain sliding oil film radial bearing with a respective roll and means carried by one of said members and reacting on the other member for un'wedging said member while permitting the bearing member to, remain on the roll neck. I

3. In a rolling mill embodying a pair of spaced uprights, roll windows formed in said uprights,

a pair of chocks carried in each of said windows,

a pair of rolls carried by said chocks'and adapted to cooperate with each other to perform a rolling operation, means for clamping said chocks against shift in said windows along the axis of said rolls, each of said chocks comprising two separable members adapted to telescope together into a wedging fit along cooperating surfaces, one of said members having the form of a continuous bearing sleeve whose inner surface forms a plain sliding oil film radial bearing with a respective roll and means carried by one of said members and reacting on the other member for unwedging said members while permitting the bearing member to remain on the roll neck.

4. In a rolling mill embodying a pair of spaced uprights, roll windows formed in said uprights,

' chocks carriedin each of said windows, rolls carried by said chocks and adapted to cooperate with each other to perform a rolling operation, means for clamping said chocks against shift in said windows along the axis of said rolls, each of said chocks comprising two separable members adapted to telescope together along cooperatingtapered surfaces, one of said members having'the form of a bearing sleeve whose inner surface forms a radial bearing with a respective roll and means carried by one of the two separable members and reacting on the other member to lock the same in telescoped position and to unwedge said members while permitting the bearing sleeve to remain on the roll neck.

5. In a rolling mill embodying a. pair of spaced uprights, roll windows formed in said uprights, chocks carried in each of said windows, rolls carried by said chocks and adapted to cooperate with each other to perform a rolling operation, means for clamping said chocks against shift in said windows along the axis of said rolls, each of said chocks comprising two separable members having continuous coniform surfaces adapted to telescope together into a wedging fltalong cooperating tapering surfaces with the greatest diameter of said tapered surfaces adjacent the roll body, one

of said members having the form of a bearing for clamping said chocks against shift in saidwindows along the. axis ofsaid rolls, each of said chocks comprising two separable members adapted to telescope together into a wedging fit along cooperating tapering surfaces, oneof said mem- .bershaving thejform of a bearing sleeve whose inner surface forms a radialbearing with a respective roll and a series of clamping members carried by and ,spaced about the periphery of said chocks, a flange on said bearing sleeve with bores that-register with bores in the chock for "receiving said clamping members, and nuts cooperating with said clamping members to lock or unlock said chock and said sleeve as desired.

7. In a rolling mill embodying a pair of spaced uprights, roll windows formed in said uprights, chocks carried in each of said windows, rolls carried by said chocks andadapted to cooperate with each other to perform a rolling operation, means for clamping said chocks against shift in said windows along the axis of said rolls, each of said chocks comprising two separable members adapted to telescope together into a wedging fit along cooperating tapered surfaces, one of said members having the form of a continuous bearing sleeve whose inner surface forms a radial .bearing with a respective roll, a series of clamping members carried by said chocks, a flange on said bearing sleeve having a set of bores registering with a set of bores in said chock for receiving said clamping members, two nuts on each clamping member, one of said nuts being accessible from the outside, the other placed between said flange and said chock, said clamping members and nuts being adapted to lock said chock and bearing sleeve in an assembled position or to .unwedge them respectively.

18, In a rolling mill embodying a pair of spaced uprights, roll windows formed in said uprights, chocks carried in each of said windows, rolls carried by said chocks and adapted to cooperate with each other to perform a rolling operation, means for clamping said chocks against shift in said windows-along the axis of said rolls, each of said shocks comprising two separable members adaptedto telescope together into a wedging fit along cooperating tapered surfaces with the greatest diameter of said tapered surfaces adjacent the body of the cooperating roll, one of said members having the form of a bearing sleeve whose inner surface forms a radial bearing with a respective roll, and a series of clamping mem- .bers carried by and spaced about the periphery of said chocks, a flange on said bearing sleeve with bores that-register with bores in the chocks for receiving said clamping members, and means -,cooperatin'g with said clamping members to lock or. unlock said chockand said sleeve as desired -'-.9. 'In a rolling mill embodying a pair of spaced uprights,-roll windowsformed in said uprights,

'QhOCKS carried in each of said windows, rolls .carried by said chocks and adapted to cooperate --with each other to performv a rolling operation,

means for clamping said chocks against shift in said windows along the axis of said rolls, each of said chocks comprising two separable memaseaess bers adapted totelescope together into a wedging fit along cooperating tapered surfaces with the greatest diameter of said tapered surfaces adjacent the body of the cooperating roll, one of said members having the form of a bearing sleeve whose inner surface forms a radial bearing with a respective roll and a series of clamping members carried by said chocks, a flange on said bearing sleeve having a set of bores registering with aset of bores in said chock for receiving said clamping members, two nuts on each clamping member, one of said nuts being accessible from the outside, the other placed beneath said flange and said chock, said clamping members and nuts being adapted tolock said chock and bearing sleeve in an assembled position or to unwedge them respectively.

10. In. a rolling mill chock construction, a hollow chock adapted to 'be mounted in a rolling mill window, a tapered bore in said chock adapted to fixedly receive a correspondingly tapered sleeve with the greatest diameter of said tapered surfaces disposed nearer the inside of the mill and a .mill roll with a material working body having a roll neck projecting within the bore of said sleeve and forming a radial bearing therewith.

11. In a rolling mill chock construction, a hollow chock adapted to be mounted in a rolling mill window, a tapered bore in said chock adapted to fixedly receive a correspondingly tapered sleeve with the greatest diameter of said tapered surfaces disposed nearer the inside of the mill, a mill roll with a material working body and a roll neck projecting within the bore of said sleeve and forming a radial bearingtherewith, oil seal members interposed between said sleeve and said roll neck closely adjacent each end of the said radial bearing, a sealing ring carried by said sleeve and mounted for axial shifting and resilient means to urge said ring into sealing contact with a surface of said roll.

12. In a rolling mill chock construction, a hollow chock adapted to be mounted in a rollin mill window, a tapered bore in said chock adapted to fixedly receive a correspondingly tapered sleeve, a mill roll with a material working body and a roll neck projecting within the bore of said sleeve and forming a radial bearing therewith, a hollow annular ring carried by said sleeve and opening'toward and closely adjacent said radial bearing and means to establish a fluid flow through said ring away from said bearing to re- 7 move foreign material from the vicinity of the bearing.

13. In a rolling mill chock construction, a hol low chock adapted to be mounted in a rolling mill window, a tapered bore in said chock adapted to fixedly receive a correspondingly tapered sleeve, a mill roll wtih a material working body and a roll neck projecting within the bore of said sleeve and forming a radial bearing therewith, a plurality of hollow annular rings carried by said sleeve and opening toward and closely adjacent said radial bearing and means to establish a fluid flow through said rings and in opposite directions axially of said bearing away from said bearing to remove foreign. material from the vicinity of the bearing in two separate fluid streams.

14. In a rolling mill chock construction, a. hollow chock adapted tobe mounted in a rolling mill window, a tapered bore in said chock adapted to flxedly receive a correspondingly tapered sleeve, a mill roll with a material working body and a roll neck projecting within the bore of directions axially of said bearing away from said bearing to remove foreign material from the vicinity of the bearing in two separate fluid streams and labyrinth sealing members in the path of said fluid flow when moving axially of said bearing.

15. In a rolling mill chock construction, a hollow chock adapted to be mounted in a rolling mill window, a tapered bore in said chock adapted to fixedly receive a correspondingly tapered sleeve, a mill roll with a material working body, a roll neck projecting within the bore of said formed to closely receive said sleeve, a key to lock said sleeve and said chock against relative rotation, a pair of thrust rings spaced apart and sleeve and forming a radial bearing therewith, a

ring member carried by said sleeve and formed with a pair oi annular recesses opening toward mill window, a tapered bore in said chock adapted to fixedly receive a correspondingly tapered sleeve, a mill roll with a material working body, a roll neck projecting within the bore of said sleeve and forming a radial bearing therewith, a ring member carried by said sleeve and formed with a pair of annular recesses opening toward said roll neck with the side walls of said recesses terminating closely adjacent said roll neck, an annular recess formed in said sleeve and opening toward said roll neck in such position that the three recesses are closely adjacent each other, a labyrinth seal formed in the outer side walls of said ring member and means to establish fluid flow in opposite directions axially of said bearing and from the center recess to the outer recesses respectively.

17. In a rolling mill chock, a mill roll with a cylindrical portion having a surface finished to provide a plain, sliding radial bearing surface, an externally tapered sleeve adapted to receive said finished surface portion to provide a sliding bearing therewith, a hollow chock member with an internally tapered bore formed to closely receive said sleeve in a wedging fit, a key to lock said sleeve and said chock against relative rotachock to lock said sleeve and said chock against relative axial movement or to wedge said chock and sleeve when desired,'a pair of thrust rings spaced apart and carried by said chock, a thrust collar carried by the roll neck, a thrust flange carried by said collar and extending between said rings and tiltable thrust receiving buttons carried by each of said pair of rings and engaging said thrust flange to provide a thrust bearing.

18. In a rolling mill chock, a. mill roll with a neck formed with two cylindrical portions of different diameter separated by a shoulder portion, one of said cylindrical'portions having a surface finished to provide a plain, sliding radial bearing surface, an externally tapered sleeve adapted to receive said finished surface portion to provide a sliding bearing therewith, a hollow chock member with an intemally tapered bore ill tion, means accessible from the periphery of said carried by said chock, a thrust collar carried by the other of said cylindrical portions .in abutment with said roll neck shoulder, a thrust flange car'- ried by said collar and extending between said rings, tiltable thrust receiving buttons carried by .each of said pair of rings and engaging said thrust flange to provide a thrust bearing and a nut adapted to encircle said roll neck to lock said collar against said roll neck shoulder.

19. In a rolling mill chock, a mill roll with a neck formed with two cylindrical portions of different diameter separated by a shoulder portion, one of said cylindrical portions having a surface finished to provide a plain, sliding radial bearing surface, an externally tapered sleeve adapted to receive said finished surface portion to provide a sliding bearing therewith, a removable ring carried by said neck intermediate its length, a packing memberinterposed between said ring and aid sleeve to provide a seal therewith, a hollow chock member with an internally tapered bore formed to closely receive said sleeve in a wedging flt, a key to lock said sleeve and said chock against relative rotation, means accessible from the peripher of said chock to lock said sleeve and said chock against relative axial movement and to unwedge the same when desired, a pair of thrust rings spaced apart and carried by said chock, a thrust collar carried by the roll neck, a thrust flange carried by said collar and extending between aid rings and tiltable thrust receiving buttons carried by each of said pair of rings and engaging said thrust flange to provide a thrust bearing.

20. In a" rolling mill chock, a mill roll with a neck formed with two cylindrical portions of different diameter separated by a shoulder portion, one of said cylindrical portions having a surface finished to provide a plain, sliding radial bearing siriface, an externally tapered sleeve adapted to receive said finished siirface portion to provide a sliding bearing therewith, a remov-' able ring carried by said neck intermediate its length, a packing member interposed between said ring and said sleeve to provide a seal therewith, a hollow chock member with an internally tapered bore formed to closely receive said sleeve, said tapering surfaces having their greatest'diameter adjacent the body of said mill roll, a pair of thrust rings spaced apart and carried by said chock, a thrust collar carried by the other of said cylindrical portions in abutment with said roll,

neck shoulder, a thrust flange carried by said collar and extending between said rings, tiltable thrust receiving buttons carried by each of said pair of rings and engaging said thrust flange to provide a thrust bearing and a nut adapted to encircle saidroll neck to lock said collar against said roll neck shoulder.

21, In a rolling mill chock, a mill roll with a neck formed with two cylindrical portions of different diameter separated by a shoulder portion, one of said cylindrical portions having a surface finished to provide a plain, sliding radial bearing surface, an externally tapered sleeve adapted to receive said finished surface portion to provide asliding bearing therewith,a removable ring carried by said shoulder portion, a packing member interposed between said ring and said sleeve to provide a seal therewith, a hollow chock member with an internally tapered bore formed to closely receiv said sleeve, said tapered surfaces having their greatest diameter adjacent the body of the mill roll, a key to lock said sleeve and said chock against relative rotation, adjustable means accessible from the periphery 01 said chock to lock said sleeve and said chock against relative axial movement including a plurality of members accessible from the exterior' of said chock and at the end thereof to break the locking effect of said taper to disassemble said chock and sleeve, a pair of thrust rings spaced apart and carried by said chock,

aseaeaa a thrust collar carried by the other of said cylindrical portions in abutment with said roll neck shoulder, a. thrust flange carried bysaid collar and extending between said rings, tiltable thrust receiving buttons carried by each of said pair of rings and engaging said thrust flange to provide a thrust bearing and a nut adapted to encircle said roll neck to lock said collar against said roll neck shoulder.

LEONARD W. NASH. CHARLES W. WILLIAMS.

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