US2016016A - Rolling mill - Google Patents

Description

6 Sheets-Sheet l gmc/YM;

Oct. l, 1935. E. w. MIKAELsoN Er AL ROLLING MILL Filed Feb. 15, 1954 OCtl 1935- E. w. MIKAl-:LsoN l=:r AL 2,016,015

ROLLING MILL ,Filed Feb. l5, 1934 6 Sheets-Sheet 2 Oct. 1, 1935. 4E. w. MIKAl-:LsoN r-:r Al.

, ROLLI NG MILL Filed Feb. l5, 1934 6 Sheets-Sheet 3 mmm Oct. l, 1935. E. w. MIKAELsoN Er AL 2,016,016

y ROLLING MILL Filed Feb. 15, 1954 6 Sheets-Sheet 4 Oct. l, 1935. E. w. MlKAELsoN ET AL 2,016,016

ROLLING MILL .Patented Get. l, 1935 PATENT OFFICE 2,016,016 ROLLING Mns.

Erik W. Mikaelson, Easton, Pa., and Alexander K. Hamilton, Chicago, Ill., assignors to Treadwell Engineering Company, Easton, Pa., a corporation of Pennsylvania Application February 15, 1934, Serial No. 711,412

15 Claims.

This invention relates to rolling mills and particularly to rolling mills designed and intended for use in rolling at high speed and with great precision elongated metal members of relatively small cross section, for instance bars of circular cross section. I

In the rolling of such members to precise shape and dimension it is generally customary to pass each through a series of stands which successively act upon the member and frequently one or more of the mills thus arranged to successively act upon a single member being processed are mills of the vertical type and others are mills of the horizontal type, thus insuring that the member being rolled is acted upon successively by sets of rolls having their axes angularly disposed. A'

superior product is produced, for instance, when a member is successively acted upon by vertical and horizontal mills, i. e., by mills in which the roll axes are vertically disposed and horizontally disposed respectively. The mill which comprises the subject matter of the present inventon is particularly adapted to be used in conjunction with other mills of either the same ordiierent type but nevertheless is entirely suitable for use as a single unit arranged to perform a complete rolling operation by itself. Primarily also the invention relates to mills of the vertical type, i. e., in which the roll axes are vertically disposed, but certain of its features are applicable also to mills of the horizontal type, as will be apparent to one skilled in the art. 'Ihe invention also particularly contemplates improvements in a mill of the vertical type with overhung rolls, that is, a mill in which the rolls are mounted upon the upper ends of the roll supporting arborsand are positioned above the supporting framework of the mill so as to be readily visible and accessible. Here again, however, certain novel features of the invention are readily applicable to mills in which the rolls are provided with axially extending necks at both ends thereof `respectively, which roll necks are rotatably supported in bearings in a suitable housing. Y

An object of the invention is to provide a rolling mill of the type above generally described which includes a supporting frame and a roll carrying housing, the housing being adjustably mounted .upon the frame in a novel and improved manner.

It will be appreciated that where a rolling mill is only one of a number of mills which successively act upon a single member passing through all of the mills, it is highly essential that the pass of `each mill be brought into exact alignment with the pass of the next succeeding mill. To this (Cl. Sil-56) end the rolls must be adjustable in a vertical plane and the means for eiecting the vertical adjustment must perform this operation with great precision. Another feature of the improved rolling mill resides in an improved means for 5 eiecting precise adjustment of one roll arbor longitudinally relatively to theV other in order to bring the grooves of one roll into exact register with the corresponding grooves of the other roll. The invention also contemplates a mill in which 1Q the roll axes may be moved laterally, i. e., caused to approach or recede from each other, while remaining in exact parallelism at all times. Novel means is provided for eifecting this lateral roll adjustment, and associated with this means is new 15 and improved mechanism for rigidly holding the arbors of the two rolls in exact parallelism at all times despite the application of heavy forces by the rolls to the object passing between them, which forces tend to separate the rolls and effect 20 relative tilting of the arbors.l

Other features of the novelty of the invention consist in the means provided for maintaining the grooves of the opposed rolls in exact register with each other despiteelongation and contrae- 25 tion of the supporting arbors by reason of changes in temperature; the driving means for impartingy rotative forces to the arbors by means of mecha- `nism positioned below the lower/ ends of rthe arbors and which maintains the driving connection to the 30 A prime ymover at all times despite changes of position of one roll arbor relative to the other; the improved housings for certain of the driving gears whereby these gears are'maintained in relatively adjustable grease tight casings, and .further im- 35 provements in details of design and arrangement of conventional elements of rolling mills generally, which will be hereinafter more speciically pointed out.

One embodiment of the invention, selected for 40 disclosure by way of example, is illustrated inthe accompanying drawings in which:

.Figurel 1 is a plan view of the improved mill, shown in conjunction with a mill of the horizontal type, positioned closely adjacent thereto; 45

Figure 2 is a side elevation of the same;

Figure 3 is an end elevation;

Figure 4 is a section on line 4-4 of Figure 1; Figures 5 and 6 are sections on lines 5 5 and 6-6 of Figure 4 respectively; 50

Figure 'l is a section on line 1--1 of Figure 4; Figure. `8 is a section on'line 8-8 of Figure 4; Figure 9is a section on line 9-9 of Figure 1; and Figure 10 is a section on line, III-I0 of Figure 4. 55

In Figures 1 and 3 of the drawings the reference numeral V indicates generally the mill which comprises the subject matter of the present invention, and the reference numeral M indicates the horizontal mill with which the improved mill V is preferably closely associated, as shown in the drawings. The details of construction of the horizontal mill comprise no part of the present invention and will not be described. It need only be said that the work passes first between the rolls I0 and I I of the vertical mill and thence directly between the rolls I2 and I3 of the horizontal mill, the approximate path of movement of work being indicated by the dotted line P in Figure 3.

The principal parts of the improved mill comprise the frame, generally indicated at F, the housing indicated at H, the mechanism for effecting the desired relative adjustment of the housing within the frame, the rolls and driving mechanism all associated with the housing, and the frame supports whereby the frame is rigidly supported upo the base in such manner that it may be moved longitudinally. l

The frame comprises an elongated box-like structure having tapering ends and lateral fianges at its bottom, indicated at I6 and I1, which flanges rest upon parallel shoe plates or trackways I8 and I9. Suitable holding-down devices, such for instance as are indicated at 20 and 2| respectively, are provided for rigidly clamping the base of the frame to the shoe plates, these devices being releasable to permit movement of the 4frame longitudinally of the shoe plates for the purpose of bringing the pass of this (vertical mill into line with the pass of the immediately succeeding machine M. In order that this longitudinal adjustment of the frame F may be conveniently carried out a motor 22 is provided which is connected to the frame F through speed reducing gearing enclosed within the casing 23 and the screw shaft 24, this shaft extending into and having threaded engagement with a nut 25 integral with or rigidly secured to the frame F. The motor 22 is, of course, of the reversible type. ,2 While the exact configuration of the frame is f a matter of choice, it may be conveniently formed as shown in the drawings, having reduced tapering ends provided withinteriorly overhanging portions 30 and 3| and accurately machined guiding surfaces 32 for the four corners of a housing, which is generally indicated at 33, the housing being bodily slidable vertically within the frame but being constrained bythe frame against all movement in a horizontal plane.

The housing in turn is a box like structure having extensions 34 and 35 at its ends which underlie the' overhanging projecting portions 30 and 3| of the frame. The housing is adjustably suspended in the frame by means of screws 36 and 31, the lower ends of these screws being non-rotatably secured to the housing extensions 34 and 35, and the threaded upper portions of the screws having threaded engagement with nuts 38 and 39 rotatably supported upon overhanging portions 30 and 3I of the frame and carrying gears 40 and 4I The nuts and gears afxed thereto are` enclosed lwithin suitable casings generally indicated at 42 and 43.

Also located within these last mentioned casings are pinions 44 and 45 (Figure 1) mounted upon 1 short shafts 46 and 41 respectively, which shafts are disposed in parallel relationship and extend outwardly, carrying upon their ends sprocket wheels 48 and 49. Sprocket chains 50 and 5I passing over these sprocket wheels extend downwardly and also pass over sprocket wheels mountsimultaneous rotation of vnuts 38 and 39 and 10 simultaneous and equal vertical movements of screws 36 and 31 toeifect vertical sliding movement of the housing within the frame. By proper operation and control of the motor 51 therefore the housing may be elevated or depressed to bring 15 the rolls I0 and II into the desired horizontal re- 1 lationship with the rolls I2 and .I3 of the associated mill.

The housing H is in turn provided with a rectangular vertically extending recess 60 within 20 which a cage 6I is positioned. This cage isso dimensioned that its side surfaces engage with a close sliding fit the side walls of the recess 60 in the housing while its length (measured llongitudinally of the housing) is considerably less than 25 that of .the recess 60 so that it may be moved longitudinally in this recess. At its top the cage is provided with a laterally extending lug 62 having horizontally disposed upper and lower surfaces. engaged by one end of a lever 63 pivotally mounted upon a horizontally disposed pin 64, the ends of which are supported in lugs projecting upwardly from the top of the housing. The opposite end of the lever 63 is tied to'the housing by 35 means of a bolt 63', the lower end of which is received in a suitable slot or recess 65 formed in the housing and the upper end of which is provided with an adjusting nut 66 and a swivel block 61 which fits within a correspondingly formed 40 recess upon the upper side of lever 63. Lever 63, mounted on pin 64, is the sole means for transferring the entire weight of the cage 6I to the housing, and by ymanipulating the nut 66,

the cage may be raised or lowered as desired in 45 order to bring the grooves formed in roll II into exact register with the grooves of roll I0. A second lever 68, also rotatably supported upon the horizontal fulcrum pin 64, has one end portion positioned in closev proximity to the hori- 50 zontal upper surface of lug 62, as shown, and a set screw 69 at the opposite end of this lever has its lower end in contact with the upper surface of the housing, the set screw extending between the parallel arms of lever 63. confines lug 62 and prevents any upward movement of the cage, but at the same time lug 62 is not positively gripped between the ends of levers 63 and 68 in order that there may be no opposition at this point to horizontal adjustment 60 ,of the cage 6I.

This horizontal adjustment of the cage is effected by means of horizontally disposed screws 10 and 1I, screw 10 having threaded engagement with a block 12 fastened in ,the housing and 65 screw 1I having a threaded engagement with a block or nut 13 also firmly securedV in the housing. yThe inner ends of these screws have contact with hardened steel inserts 14 and 15 respectively, supported in the adjacent face of the cage 70 and upon or adjacent their opposite ends are fixed the spiral gears '11 and 18. By referring to Figure 10, it will be seen that the teeth of gear 11 mesh with the teeth of a worm 19 and that the teeth of gear 18 mesh with those of a worm 60, 75

The lower horizontal surface of lug 62 is 30.

The lever 68 closely 55 worms 19 and 80 being xed upon a shaft 8| rotatably supported in the housing and having a polygonal upper end 82 by means of which this shaft may be manually rotated when a suitable tool is applied thereto. Manual rotation of shaft 8|, of course, effects simultaneous rotation of screws 10 and 1| and equal horizontal and longitudinal movements of these screws so that cage 6| may be moved to the right or to the left (Figure 4) relatively to the housing without changing iny the slightest its angular position relative to the housing. In order to maintain block 14 at all times in tight contact with the end of screw 10 a resilient retracting means is employed, this means including horizontally extending bolts 90 and 9|, the inner ends of which are secured to the cage, as shown in Figure l, and the outer ends of which are provided with spring abutments 92 and 93 respectively. Intermediate spring abutments 92 and 93 and webs or vertical anges 91|` and 95 of the housing are confined compression springs 96 and 91 which at all times tend to expand and the conjoint action of which is to draw the upper end of the housing toward the left (Figure 4), thus forcing the block 14 tightly against the inner end of screw 10, for alf positions of adjustment of the cage in the housing.`

Means is provided for preventing movement of the lower end of the cage toward the right (Figure 4) under the influence of heavy rolling forces developed between the rolls I and during the operation of the mill. This means is most clearly indicated in Figures 7 and 8. Parallel horizontal rods |00 and |0| have enlarged inner ends which slidably fit within vertical T-slots formed in the cage, these rods lying in the horizontal plane of the lower adjusting screw 1| and extending outwardly through suitable apertures in the housing, to the exterior thereof. Slidably mounted on the outer end of each such rod is a block, these blocks being indicated at |02 and. |03 respectively, and both such blocks having co-axial upwardly and downwardly extending cylindrical projections, most clearly shown in Figure 8. These cylindrical projections are received within cylindrical apertures formed in cross bars |00 and |05 respectively, and cross bars |00 and |05 are also providedC with central cylindrical recesses to receive upwardly and downwardly coaxial projecting portions of a block |00 rotatably mounted upon the lower adjusting screw 11|., An internal shoulder formed on block |00 rests against a flange |0| preferably formed integrally upon screw 1|. When the nuts |00; and |09, which have threaded engagement with the extreme outer ends or rods |0|, are tightened, rods |00 and |0| become tension membersorcing the block 15, positioned at the lower end of the cage, tightly against the inner end of screw iii, and inasmuch as screw 1| has at all times threaded engagement with the nut 13 secured to the housing, the lower end of the cage is securely held by the means just described against horizontal movement despite the possible presence of very strong forces developed at the rolls tending to bring about such movement. By the cooperation of screw 1|, rods |00, and the associatedvmechanism just described, however, the lower end of the cage may be very rmly anchored against horizontal movement for all possible adjustments of the cage.

It has been explained how the frame may be horizontally adjusted, the housing vertically adjusted within the frame, and the cage vertically and horizontally adjusted within the housing. All of these adjustments are for the purpose of bringing the corresponding grooves of two rolls into precise register and-bringing the pass of the mill into exact register with the corresponding pass of Athe next adjacent mill. By the means just described, the most exact positioning of the pass of the mill may be brought about and maintained so that the actual rolling opera'- tion is accomplished with a very high degree of accuracy.

The means for supporting and driving the rolls |0 and II will now be described. 'I'he roll I0 is mounted upon the upper end of an arbor |0 and the roll upon the upper end of arbor Arbor |0 is rotatably mounted upon the housing 33 by means of upper and lower antii'riction bearings ||2 and ||3, respectively. 'I'he outer race of the upper bearing ||2 is supported in fixed relationship to the housing by means of the bearing cap H4, secured to the housing by bolts I I5, and it is this upper bearing which transmits the weight of the arbor and roll to the housing. The lower bearing H3 has its outer race ||3' fitting closely within a cylindrical aperture inthe housing formed to receive it, and there is likewise a lower bearing cap ||6 secured to the housing. 'I'he outer race ||3 of the lower bearing, however, is not confined against vertical movement but is free to slide axially within the recess in which it is contained as the arbor itself expands and contracts as the result of changes in temperature. A cylindrical recess, co-axial with arbor ||0, is formed in the under-portion of the bearing cap I6, and this recess receives the upper portion of a cylindrical sleeve ||1 secured to the housing, an annular packing ring ||9 being provided to prevent the escape of grease between the outer surface of the sleeve and the inner cylindrical surface of the bearing cap. Cap I6 is detachably secured in position by means of bolts H9. Upon the lower end of arbor H0 is splined 'a bevel gear |30, the supporting plate |2| secured to the bottom of the shaft carrying the weight of this gear. The teeth of gear i2@ mesh with the teeth of a companion gear |23 xed on a drive shaft |24 extending horizontally and. disposed in the plane of the axes of the arbore and One end of shaft |24 is suitably mounted in the housing by means of an anti-friction bearing |25 and at this end projects through the cap |2|i and into the speed reduction gear box mi. Drive shaftv |2| is in turn driven by means of an electric motor |20 mounted upon an extension |29 of the housing, through the gearing illustrated, whereby arbor H0 and roll ||i are rotated at the desired speed. As the driving motor moves with the housing at all times, its alignment with the shaft |261 and gearing is at all times perfectly maintained.

Arbor is supported by means generally similar to that which has just been described in con nection with arbor M0, but is, of course, carried by the cage 6| instead of directly by the housing. The upper anti-friction bearing |30 rotatably supports arbor and transmits the weight of the arbor to the cage through the bearing cap ||i|. It will be understood that both. bearings i2 and |30 are of the type having the capacity to take up end thrust due to the weight of the arbors and rolls mounted thereon. The lower anti-friction bearing |32 has its outer race likewise slidably mounted within a cylindrical recess formed in the cage so that this bearing does not taire end thrust vbut permits longitudinal expansion and contraction of the arbor without opposition., The

lower bearing cap |33 is provided with a cylindrical recess co-axial with the arbor I into which is received the cylindrical upper end of a sleeve like projection |34 of the gear case |35 which is mounted upon the lower end of the housing. Mounted within the sleeve portion I 34 of the gear case, and supported upon an annular ring |36, is an anti-friction bearing |31, the inner race of which carries a pinion |38 splined to the lower end of the arbor 'I'he teeth of pinion |38 mesh with those of a mating pinion |39 splined upon the end of drive shaft |24 and rotatably supported within the gear case |35 by means of anti-friction bearings |40. 'I'he gear case |35is supported upon the housing for horizontal sliding movement, having projecting flanges |35' received in trackways formed upon the housing in part by cutting away the housing and in part by securing the horizontally extending strips |42 thereto, to form grooves, receptive of flanges 35. Gear case |35 may therefore move horizontally when the cage 6| is adjusted, the gear case being moved by reason of the interengagement of sleeve portion |34 thereof with the bearing ca .p |33 of the cage.

; In such movements gear |39 will simply slide along shaft |24, but the driving connection between the shaft and arbor will be maintained at all times. As clearly illustrated in Figure 6, the bottom of gear case |35 is closed by a cap |43, which may be removed when necessary, and an end closure cap |44 is also provided. A similar cap |45 is secured to the housing beneath arbor ||0 to enclose gears |20 and |23. In order that both of these gear containing spaces may be greasetight, closure plates and |5| are provided. These plates are apertured for the passage of drive shaft |24, and packing means |50' and |5|' is provided to prevent the vescape of grease through the apertures provided for the drive shaft. In the vertical movements of the cage 5| the arbor maintains its driving connection with gear |38, this gear Vas well as gear case |35 not being vertically movable, but arbor sliding relatively to the gear and cap |33 sliding along projection |34.

It is thought that the operation of the driving mechanism will be clearly understood from the above description. Driving connection between the pairs of bevel gears is maintained at all' times despite, in the case of arbor both horizontal and vertical adjustments of the cage in which the arbor is supported.

Whenever desired, either or both of the arbors may be readily and easily removed. Thus removal of the gear case caps |43 and 45 permits removal of tldrive shaft and associated pinions and gears |23 and |39, thus exposing to view pinions |20 and |30. To remove, arbor ||l supporting plate |2| will iirst be removed so that gear |20 may be dropped. Sleeve may then be detached and immediately thereafter the bearing cap IIS. Bearing I3, which is thus exposed, may then be freed from the arbor. By removal of bearing cap I4, bearing I2 may be freed from the arbor so that the latter may be drawn upwardly and out of the housing. In a generally similar manner, bearings |32 and |30 may be freed from arbor and that arbor removed, it

being understood, of course, that the cap |33A must be removed to make the bearing nut accessible.

The rolls of the improved mill, projecting as they do above the frame and housing, are readily accessible and visible, thus facilitating the operation, inspection, and repair. The mill as a whole is most compact and comparatively light in weight. 'Ihe various adjustments provided make it possible for the operator to bring the rolls into the exact necessary relationship with each other and with the rolls of the next adjacent mill to perform work requiring the greatest precision.

f Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is:

1. A rolling mill comprising, in combination, a I housing, a cage formed separately from the housing, two parallel roll arbors, one rotatably supported by the housing and the other by the cage, means for laterally adjusting the position ofthe cage with respect to the housing, and means for longitudinally adjusting the cage with respect to the housing, said last mentioned means permitting lateral movement of the housing at all times.

2. A vertical mill comprising a housing, a cage vertically and horizontally adjustable relatively to the housing and having a horizontal downwardly facing surface adjacent its top, parallel vertically disposed roll arbors, one rotatably supported by the housing and the other similarly supported by the cage, and a member mounted 2 on the housing and having a portion engaging said horizontal surface of the cage, said member transmitting the entire weight of the cage to the housing and being operable to raise or lower the cage. I

3. A vertical mill comprising a housing, a cage vertically and horizontally adjustable relatively to the housing and having a horizontal downwardly facing surface adjacent its top, parallel vertically disposed roll arbors, one rotatably sup- 3l ported by the housing and the other similarly supported by the cage, a, lever pivotally mounted on the housing and having one end portion engaging said horizontal surface of the cage, said lever transmitting the entire weight of the cage to the housing, and means at the other end of said lever for rocking the vsame about its pivotal axis and locking it in any desired position of adjustment.

4. A vertical mill comprising a housing anda 4d cage, each supporting a vertical rotatable roll arbor, the cage having a lug extending horizontally therefrom, said lug having horizontal upper and lower surfaces, two members adjustably mounted on the housing for engaging the horizontal surfaces of the lug respectively, whereby the cage is adjustably supported and guided.

5. In a vertical mill, in combination, a housing, a cage, a vertical arbor carried by the cage,

a screw member having threaded engagement with the housing, the end of which bears against the cage, for thrusting the cage laterally with respect to the housing, a yoke rotatably mounted on said member without the housing, and means connecting the yoke and cage for preventing motion of the cage away from the end of the screw.

6. In a vertical mill, in combination, a housing, a cage, a vertical arbor carried by the cage, a screw member having threaded engagement with the housing, the end of which bears against the fcage, for thrustingl the cage laterally with respect to the housing, a yoke rotatably mounted on said member without the housing, and rods slidably extending through apertures in the housing and having their outer ends connected to the yoke and inner ends connected to the cage, said rods comprising tension members preventing motion rof the cage away from the housing.

'1. In a rolling mill, in combination, a frame having a vertically extending recess provided with parallel vertically disposed guide surfaces, a rollv supporting housing within said recess and having surfaces which slidably engage at all times the guide surfaces of the frame, said housing and frame having horizontally overlapping portions, and means for eiecting vertical movement of the housing within the frame and maintaining the housing in any desired position of adjustment said means comprising adjustable members connecting the overlapping portions of the housing and frame, the housing being adjustably hung from the frame by said members.

8. In a rolling mill, in combination, a frame having a vertically extending recess provided with parallel vertically disposed guide surfaces, a roll supporting housing within said recess and having surfaces which slidably engage at all times the guide surfaces of the frame, said housing and frame having horizontally overlapping portions, and means for effecting vertical movement of the housing within the frame and maintaining the housing in any desired position of adjustment, said means comprising vertically extending adjustable tension members connecting the overlapping portions of the housing and frame, said members transmitting the entire Weight of the housing and rolls to the frame,

9. In a. rolling mill, in combination, a frame having a vertically extending recess provided with parallel vertically disposed guide surfaces, a roll supporting housing within said recess and having surfaces which slidably engageat all times the guide surfaces of the frame, said housing and frame having horizontally overlapping portions,

and means for effecting vertical movement of the #housing within the frame and maintaining the housing in any desired position of adjustment, said means comprising spaced vertically extending screws located at the ends of the housing and in the plane of the roll axes, said screws connecting the overlapping portionsof the housing and frame, the housing being adjustably hung from the frame by said screws.

10. In a rolling mill, in combination, a housing7 parallel roll arbors rotatably mounted in the housing, one of said arbors being adjustable relatively tothe other in an .axial direction, driving means for said arbors including gears mounted thereon so as to rotate therewith, a drive shaft beyond the ends of the arbors and extending transversely thereto, and gears fixed upon said drive shaft and meshing with said first mentioned gears respectively, the gear mounted on the adjustable arbor being slidable axially thereof so as to maintain meshing engagement with its mating gear when said arbor is adjusted.

11. In a rolling mill, in combination, a housing, .a roll arbor having a roll thereon, spaced bearings rotatably supporting the arbor in the housing, one of the bearings being slidable at all times relatively to the housing independently of the other bearing, and the other bearing holding the arbor against axial movement bodily relatively to the housing.

12. In a rolling mill, in combination, ahousing, a roll carrying arbor, and means comprising spaced bearings rotatably supporting said arbor Y in said housing, one of said bearings being slidably mounted in the housing to permit free longitudinal expansion and contraction of the arbor and the other bearing anchoring the arbor against bodily axial movement.

13. In a rolling mill, in combination, a frame, a roll arbor having .a roll xed upon one end and a driving gear upon the other, means supporting said arbor in the frame for lateral adjustment, a driving shaft extending transversely and beyond the end of said arbor, a gear slidably mounted upon said shaft and meshing with said first mentioned gear, and a casing enclosing said interrneshing gears, said casing being slidably carried by the frame and being formed separately from and detachably connected to the arbor supporting means, the casing and arbor supporting means being provided with mutually i contacting cylindrical surfaces providing a telescoping joint permitting axial movement of the arbor and its supporting means relatively to the casing.

14. In a vertical mill, in combination, a housing, a cage carried by the housing and `adjustable horizontally thereon, two parallel vertically disposed roll arbors, one rotatably supported in f with respect to the housing during rolling opera- 40 tions, said second means being readily adjustable to permit bodily .adjustment of the cage.

15. In a vertical mill, incombination, a housing, a cage carried by the housing and adjustable horizontally thereon, two parallel vertically disposed roll arbors, one rotatably supported in spaced bearings mounted in the housing and 4the other supported in spaced bearings mounted in the cage, the arbors projecting above the upper supporting bearings and having rolls mounted upon their upper ends, respectively, a horizontally disposed screw having threaded engagement with the housing and its end bearing against the cage, toward the upper end thereof, for horizontally adjusting the cage relatively to the housing, a second screw disposed parallel to said rst mentioned screw and. also having threaded engagement with the housing, one end of the last mentioned screw bearing against the same side of the cage as does the rst screw but toward the lower end thereof, and a tension member connecting the body of said last mentioned screw

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