US3196658A - Roll changing rig - Google Patents

Roll changing rig Download PDF

Info

Publication number
US3196658A
US3196658A US260612A US26061263A US3196658A US 3196658 A US3196658 A US 3196658A US 260612 A US260612 A US 260612A US 26061263 A US26061263 A US 26061263A US 3196658 A US3196658 A US 3196658A
Authority
US
United States
Prior art keywords
mill
rolls
roll
roll changing
vertical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US260612A
Other languages
English (en)
Inventor
Sieger Maurice Paul
Adair James Richard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
United Engineering and Foundry Co
Original Assignee
United Engineering and Foundry Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by United Engineering and Foundry Co filed Critical United Engineering and Foundry Co
Application granted granted Critical
Publication of US3196658A publication Critical patent/US3196658A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/08—Interchanging rolls, roll mountings, or stand frames, e.g. using C-hooks; Replacing roll chocks on roll shafts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/08—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with differently-directed roll axes, e.g. for the so-called "universal" rolling process

Definitions

  • ROLL crmwme are Filed Feb. 25, 1963 5 Sheets-Sheet 2 i J 20 l 56 l 59 5 35 T I 1 9 l5 l l5 I I8 I I8 INVENTORS MAURICE P. SIEGER BY JAMES R. ADAIR TH EIR AIIORNEY 1965 M. P. SIEGER ETAL 3,196,658
  • the purpose of this invention in relationship to vertical mills of the above type, is to provide a novel arrangement for quickly changing one or both rolls of the mill, which is particularly advantageous when employed to service vertical mills employing overhead drives. It is a feature of the invention to provide an arrangement that will eliminate the need of an overhead crane for the actual roll changing operation, since the crane is required only to lift a portable roll changing apparatus onto and off of the mill table before and after the roll changing operation, respectively. The actual mounting of the new rolls onto the apparatus and the removing of the old rolls therefrom can be done at any time when convenient and, particularly, after the mill has been put baclr into operation.
  • a roll changing arrangement including an apparatus having an overhanging elevated portion for receiving and carrying a pair of vertically arranged rolling mill rolls of a vertical mill.
  • the apparatus also has a base section which engages with and is carried by the reversably driven table rollers of the mill and by which means the apparatus is advanced toward and away from the mill after it has been placed thereon by a crane. T e side guards of the mill can be used to properly position the apparatus relative to the mill.
  • the overhanging portion of the apparatus is designed to be placed in position to receive the vertical rolls of the mill. Prior to this the rolls are moved relative to the housings of the mill onto an awaiting lifting device which simutlaneously transfers the rolls onto the overhanging portion of the apparatus.
  • the apparatus can be retracted away from "ice the mill by rotating the driven table rollers, after which it is removed from the table by a crane.
  • the crane will then place a second apparatus upon the table having a new pair of rolls carried thereby and the operation is reversed.
  • FIGURE 1 is an elevational View, partly in section, of a universal slabbing mill shown for the purpose of illustrating various features of the present invention
  • FlGURE 2 is an elevational view of the roll carrier that is secured to the vertical edger mill shown in FIG- URE 1;
  • FIGURE 3 is the second elevational view of the roll carrier shown in FIGURE 2 with one of the rolls removed to facilitate illustrating some of the characteristics of the roll carrier;
  • FIGURE 4 is an elevational view, partly in section, of one form of the roll changing apparatus herein disclosed, and of the mill entry table and universal slabbing mill, only one housing of the vertical edger mill being shown wherein the rolls have been removed to better illustrate certain features of the present invention
  • FIGURE 5 is a plan view of the roll changing apparatus illustrated in FIGURE 4.
  • FIGURE 6 is a partial sectional view taken on the lines VIVI of FIGURE 5;
  • FIGURE 7 is an elevational view of the roll changing apparatus rotating device employed in conjunction with the roll changing apparatus shown in FIGURES 4, 5 and 6;
  • FIGURE 8 is a second elevational view, partially in section, of the roll changing apparatus rotating device that is shown in FIGURE 7.
  • the universal mill consists of a vertical edger mill 9 .and a slabbing mill It the latter being only partly illustrated, the rolls thereof not being shown at all.
  • Projecting from each of two common sides of the slab mill 10 are two pairs of spaced-apart hinge elements 11 into which are received complementary hinge elements 12 formed as an integral part of identical vertically extending edger mill housings 13 and 14 of the vertical mill 9.
  • Each housing 13 and 14 rotatably receives cooperating vertically disposed rolls 15 and 16, to the opposite ends of which bearing-chock assemblies 17 are secured.
  • the opposed chocks of each roll are connected together by cross members 13.
  • the vertical edger mill 9 is provided with symmetrical overhead drives 20 which are driven from a common electrical motor not shown.
  • Each drive includes a bevel gear set, not shown, one of which is drivenly connected to a spur gear 21 which, in turn, meshes with hollow spur gears 22, this gear being rotatable about the gear 21 on rotation of the housings 13 or 14.
  • the spurgears are best shown in FIGURE 4.
  • FIGURES 1 and 4 projecting from the spur gears 22 into which they are received are parallelly arranged driving spindles 23 and 24 which carry at their lower ends universal couplings 25 and 26 for engaging in driving relationship with the upper ends of vertical rolls 15 and 16.
  • the spindles 23 and 24 are connected to the spur gears 22 by splines 30 which permit them to be raised and lowered whereby the couplings 25 and 26 can be raised out of their operative positions.
  • the operative and retractive positions of the coupling are illustrated in FIGURE 1.
  • the mechanism for raising and lowering the spindles is shown only in FIGURE 1 where it is illustrated with respect to the spindle 24.
  • This spindle is provided with an internal bore into which is received the cylinders of a piston cylinder assembly 27, the piston of which extends from the lower end thereof and engages, when lowered, the upper end of the roll 16, the roll being at this point immovable.
  • the spindle 24 will beforced up into the hollow spur gear 22.
  • a latch 28 is provided, being pivotally mounted on the housing 14 and which, as shown in FIGURE 1, can be positionedto engage the coupling 26 to hold the latter from lowering. The latch is rotated by a lever 29.
  • the symmetrical housings 13 and 14 of the vertical edger mill 9 are provided with elevated horizontally arranged rails 31 which extend toward the center of the mill and which may by rotation of the housings be located in a coplanar relationship.
  • upright plates 32 are secured thereto which serve as guides or restraining members for the roll assemblies as they are moved laterally over the rails 31 during the roll changing operation.
  • the upper chocks are provided with grooves 33 and 34 at their lower ends.
  • the grooves 34 they are made to extend entirely across the face of the chocks; whereas, the grooves 33 have a relatively narrow length.
  • the width of the projections and the depth of the grooves are made to be received by the rails 31, in the case of the grooves 34 and by a bracket of the roll changing apparatus yet to be explained, in the case of the grooves 33.
  • the bearing-chock assemblies 17 are designed to be secured to the housings 15 and 16 of the vertical edger mill by a series of bolts.
  • the housings are provided with bolt holes, as are the checks, into which the bolts are received.
  • each of the upper chocks 17 is provided with a pair of upwardly extending hooks 35 that extend toward the center of the mill when the chocks are in their operative positions.
  • Another significant construction characteristic of the chocks is found in the projections 19 which project from one of the sides of each of the chocks. It is the purpose of these projections to prevent the faces of the rolls from contacting each other during the roll changing operation and, as shown in FIG- URE 3, the projections abut against each other to accomplish this purpose.
  • the symmetrical housings 13 and 14 are rotated toward and away from each other by means of individual screw 36 rotatably secured to end frames 37, the screws being driven by motors not shown.
  • the inner end of the screw is received by a ram 38 which is connected to the housing 13 by means of a cross head member 39 that slides over the ram.
  • a pullback piston cylinder assembly 41 is provided, the cylinder being trunnion mounted on the end frame 37 and having its piston connected to the back of the housing 13.
  • the rolls 15 and 16 are moved laterally along the rails 31 to effect their removal and replacement by piston cylinder assemblies 42 carried by the upper portions of the end frames 37.
  • the location of the cylinder assemblies is such that when the housings are properly positioned, the axes of the assemblies will coincide with d the rolls.
  • FIGURE 1 which illustrates these cylinder assemblies, it will be noted that to the end of the piston rods of the assemblies, latches 43 are secured which have outer faces that may be brought into engagement with the upper chocks 1'7 of the rolls.
  • the chocks at the engageable locations are provided with slots 44 into which are received the latches :3.
  • the piston rods of the assemblies 42 are permitted to rotate within the cylinders so that the latches can be rotated 180 whereby they can be brought into a position directly over the slots 44 and rotated against the same distance which will bring the latches 3 into the slots 44 and, thus, upon operation of the piston cylinder assemblies 42 the rolls will be pulled toward the cylinders.
  • FIGURE 1 the piston cylinder assembly 42, at the left of the figure, is shown in its inoperative position, whereas the piston cylinder assembly 42' at the right of the figure is shown in its pushing position with the latch 43 in abutting relationship with the end of the chock 17.
  • FIGURES 1 and 4 Before turning to the description of the roll changing apparatus, it is important to discuss two other components of the universal mill.
  • an entry table 45 is provided comprising a number of rotatable rollers 46 which are driven by reversible individ ual motors 47, one of which is shown in FIGURE 1.
  • side guards 43 and 4? the construction and operation thereof as with the table being well known in the art.
  • the side guard 48 is carried by a ram 51 which is advanced transversely by a rackand pinion 52.
  • side guard 49 is carried by a ram 53 and is advanced by a rack and pinion 54.
  • the pinions are rotated by a power source not shown.
  • the roll lifting mechanism includes a vertically arranged piston cylinder assembly 55, the cylinder of which is carried by a frame 56 which is secured to the drives 20 of the vertical edger mill 9. To the upward projecting end of the piston of this assembly there is connected a horizontally extending link 57 which is pivotally connected to the ends of two parallel rods 58. The lower ends of the rods 53 are received into a carrier member 59 which at its bottom is formed with two horizontal projections 61.
  • FIG- URE 3 illustrates the relationship that will exist between the carrier member 59 and the hooks when the rolls have been brought to the center of the mill immediately before the piston cylinder assembly is operated to lift the rolls off the rails 31.
  • a roll changing carriage 62 which is made up of a rigid upper frame member 63 and three perpendicular arranged base members 64, the lower surface of the base members being designed to engage the reversably driven rollers 46 of the mill table 415.
  • an outwardly projecting bracket 65 having a groove 66 to which is received the projecting portion of the front grooves 33 of the upper chocks 17, the bracket being made sufficiently long to carry both of the rolls 15 and 16 at the same time.
  • a vertically extending member 67 having complementary tapering sides.
  • sloping plates 68 are provided, the tapers of the member 67 and the slope of the side plates 68 diverge towards the center of the apparatus.
  • the weight of the rolls are not carried by the bracket 65 as exemplified by the clearances shown between the upper chocks 17 and the bracket.
  • the weight of the rolls is entirely carried by the base members 64. Accordingly, the upper surfaces of the base members 64 are formed with the roll carrying surfaces on which portions the lower surfaces of the lower chocks rest.
  • the center members 64 serve to carry both of the rolls. Projecting from the opposite sides of the carriage 62 are arms 70, to the ends of which lugs are secured. The lugs engage the housings 13 and 14 positioning the carriage relative to the mill 9.
  • the roll changing apparatus is so constructed that the required stability is assured when the rolls are being carried thereby and that the apparatus contains the proper balance in both its loaded and unloaded condition.
  • the apparatus is designed to be lifted by an overhead crane and for this purpose a linkage assembly 69 is provided at the top of the apparatus.
  • the linkage assembly is in its upright position as shown in the drawings.
  • the linkage assembly 69 is rotated and held in a substantial horizontal position by a chain 71, where it will be engaged by the hook of the overhead crane.
  • the roll changing apparatus 62 is provided with a trunnion rod 72 which is mounted at its base. As shown in FIG- URE 7, a substantial portion of the rod is open at the center of the apparatus.
  • FIGURES 7 and 8 illustrate a roll rotating device having an upright pedestal 73, the top of which has a recess 74 into which is received the center portion of the trunnion rod 72.
  • FIGURE 8 best shows this relationship.
  • the pedestal '73 is received in an opening 75 formed in the foundation, in which the top of the pedestal projects above the top surface of the foundation.
  • the roll changing apparatus 62 including a pair of rolls, is adapted to be set upon the pedestal 73 by a crane, the crane hook only being shown. Gnce the apparatus is so positioned, the crane will move its hook toward the left and allow it to lower, thus causing rotation of the apparatus until a portion of the top of the apparatus rests upon one of the sides of the foundation 75.
  • the outlined portion of FIGURE 8 illustrates the roll changing apparatus and its roll in the horizontal position.
  • the roll changing apparatus 62 excluding rolls, is placed by an overhead crane onto the reversing rolls 46 of the mill table 45, after which the manipulator side guards 48 and 49 are operated to assume a predetermined position where they will act as guides for cent-rally positioning the apparatus 62 with respect to the mill 9.
  • the apparatus Upon clockwise rotation of table rollers 46, the apparatus will be moved to a position directly in front of the mill.
  • the piston cylinder assembly 55 of the lifting device is operated to lower the roll carrying member 59 in the position shown in outline form in FIGURE 1. While this is being done, the bolts employed to fasten the rolls 15 and 16 to their housings 13 and 14, respectively, are removed.
  • the piston cylinder assemblies 42 are operated to push the rolls 15' and 16 along the rails 31 to a position at the center of the mill and in a position to allow the hooks 35 to pass over the projection 61 of the roll carrying members 59, as shown in FIGURE 3.
  • the piston cylinder assembly 55 is again operated to raise the rolls as a unit a distance sufiicient to permit the roll changing apparatus 62 to be advanced by rotating the roller table 45 and placed in position to receive the rolls.
  • the lugs of the arms 70 will engage the housings 13 and 14 to position the apparatus 63 in the proper position relative to the axis of the rolls.
  • both rolls are lowered onto the apparatus by operation of the piston cylinder assembly 55 in which connection the bottom choclrs 17 of the rolls come to rest upon the three base members 64 of the apparatus and the grooves 33 of the upper checks will find their places within the groove 66 of the bracket 65.
  • the table rollers 45 are rotated in a counter-clockwise direction to retract the apparatus from in front of the mill 9 where the overhead crane will remove the apparatus with the rolls from the table.
  • the crane will place upon the table a second duplicate apparatus including a replacement pair of rolls for insertion into the mill.
  • the new roll-s are inserted into the mill by a reversal of the aforesaid operation.
  • the roll changing apparatus of the type herein disclosed can be employed with various types of rolling mills which need not be a universal mill and other types of vertical mills than the one illustrated. Moreover, the roll changing apparatus illustrated can be used to handle only a single roll should this be desired.
  • An apparatus for changing a roll of a rolling mill comprising:
  • a table having a plurality of rollers arranged adjacent to said mill for handling workpieces for said mill, means for rotating said rollers of said table so as to convey a workpiece relative to said mills,
  • said carriage having a member of a length sufficient to engage simultaneously at least two rollers of said table and being supportable and advanced relative to said mill by said table, and
  • An apparatus including a pair of side guards arranged adjacent to said mill and on a side common to said table, said carriage including members arranged on the two sides of said carriage adjacent to said side guards engageable by said side guards, and
  • An apparatus for changing a roll of a vertical rolling a! mill wherein said roll has upper and lower bearing-chock assemblies secured to its opposite ends comprising:
  • a base member having a roll supporting surface that is engaged by the lower bearing-chock assembly of the roll when the roll is in a substantial upright position
  • said upright member including means for engaging the upper bearing chock assembly for restraining said roll from moving out of its upright position
  • said base member includes at least two roll supporting surfaces which are engaged by the lower bearing-chock assemblies of a pair of rolls, and
  • said roll engaging means is so constructed and arranged to restrain both of said rolls from moving out of their upright positions.
  • said roll engaging means includes two compartments formed by a tapering center member and two side members, and
  • An apparatus including a trunnion means around which the apparatus is rotatable, and
  • a roll changing apparatus comprising a base'meinber having at least two roll supporting surfaces which are engaged by the lower portions of said pair of rolls,
  • said means for moving said rolls over said supporting means includes a means that allows said rolls to be moved in opposite directions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Basic Packing Technique (AREA)
US260612A 1962-03-09 1963-02-25 Roll changing rig Expired - Lifetime US3196658A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9113/62A GB1024931A (en) 1962-03-09 1962-03-09 Roll changing arrangement for a vertical mill stand

Publications (1)

Publication Number Publication Date
US3196658A true US3196658A (en) 1965-07-27

Family

ID=9865611

Family Applications (1)

Application Number Title Priority Date Filing Date
US260612A Expired - Lifetime US3196658A (en) 1962-03-09 1963-02-25 Roll changing rig

Country Status (5)

Country Link
US (1) US3196658A (US08124317-20120228-C00060.png)
BE (1) BE629393A (US08124317-20120228-C00060.png)
DE (1) DE1283184B (US08124317-20120228-C00060.png)
ES (1) ES285901A1 (US08124317-20120228-C00060.png)
GB (1) GB1024931A (US08124317-20120228-C00060.png)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3518863A (en) * 1968-05-27 1970-07-07 United Eng Foundry Co Vertical roll arrangement and removal thereof in a universal beam mill
US4329864A (en) * 1980-08-11 1982-05-18 Wean United, Inc. Apparatus for changing rolls in vertical rolling mills

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102172616B (zh) * 2011-01-11 2015-10-14 中冶赛迪工程技术股份有限公司 上传动立辊轧机、轧机布置方式及换辊方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US394122A (en) * 1888-12-04 Rolling-mill
US661470A (en) * 1900-05-22 1900-11-06 Joseph Fawell Rolling-mill.
US749745A (en) * 1903-09-10 1904-01-19 Bethlehem Steel Corp Rolling-mill.
US2535898A (en) * 1944-10-10 1950-12-26 Carnegie Illinois Steel Corp Apparatus for changing vertical mill rolls
FR1251984A (fr) * 1959-03-28 1961-01-20 Demag Ag Train de laminoir en continu à cages interchangeables

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE384360C (de) * 1922-05-19 1923-11-24 Fried Krupp Akt Ges Grusonwerk Vorrichtung zum Aus- bzw. Einbauen der Walzen bei Walzengeruesten
BE331977A (US08124317-20120228-C00060.png) * 1925-12-14
US2037210A (en) * 1934-12-18 1936-04-14 United Eng Foundry Co Roll changing apparatus
DE693224C (de) * 1938-03-23 1940-07-04 Schloemann Akt Ges Vorrichtung zum Auswechseln der Walzen von Walzwerken
DE757924C (de) * 1940-11-06 1953-02-02 Schloemann Ag Vorrichtung zum Ein- und Ausbauen der Walzen von Walzgeruesten
DE903807C (de) * 1943-01-20 1954-02-11 Schloemann Ag Duo-Kaliber-Walzwerk, bei dem bei axial festliegender Oberwalze die Unterwalze axial einstellbar und ein Schlitten zum seitlichen Ausbau der Walzen vorgesehen ist
US2528075A (en) * 1945-08-10 1950-10-31 Edward T Peterson Bar mill
US2565928A (en) * 1946-02-19 1951-08-28 Morgan Construction Co Rolling mill
DE851941C (de) * 1951-07-27 1952-10-09 Achenbach Soehne Ges Mit Besch Einrichtung zum Walzenwechsel in Walzwerken
DE1717275U (de) * 1952-05-02 1956-02-23 Siemag Siegener Masch Bau Auswechselbares vertikalgeruest mit oberhalb des geruestes liegendem antrieb.
US2752804A (en) * 1952-07-15 1956-07-03 Mesta Machine Co Metal rolling mills
US2870664A (en) * 1953-02-19 1959-01-27 Inter Continentaler Huttenbau Vertical-type rolling mill
GB750425A (en) * 1953-07-09 1956-06-13 Loewy Eng Co Ltd Roll-changing device
DE1670268U (de) * 1953-11-21 1954-01-14 Max Buehler Vorrichtung fuer den ein- oder ausbau von walzen, rollen od. dgl.
DE1749513U (de) * 1954-03-26 1957-08-01 Siemag Siegener Masch Bau Vorrichtung zum aus- und einbau der staenderrollen an walzgeruesten.
DE1815828A1 (de) * 1967-12-26 1970-10-29 Ramberg Ingwald Lee Werkzeugmaschine mit Einrichtung zum Aufrechterhalten der Genauigkeit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US394122A (en) * 1888-12-04 Rolling-mill
US661470A (en) * 1900-05-22 1900-11-06 Joseph Fawell Rolling-mill.
US749745A (en) * 1903-09-10 1904-01-19 Bethlehem Steel Corp Rolling-mill.
US2535898A (en) * 1944-10-10 1950-12-26 Carnegie Illinois Steel Corp Apparatus for changing vertical mill rolls
FR1251984A (fr) * 1959-03-28 1961-01-20 Demag Ag Train de laminoir en continu à cages interchangeables

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3518863A (en) * 1968-05-27 1970-07-07 United Eng Foundry Co Vertical roll arrangement and removal thereof in a universal beam mill
US4329864A (en) * 1980-08-11 1982-05-18 Wean United, Inc. Apparatus for changing rolls in vertical rolling mills

Also Published As

Publication number Publication date
ES285901A1 (es) 1963-07-01
BE629393A (US08124317-20120228-C00060.png)
GB1024931A (en) 1966-04-06
DE1283184B (de) 1968-11-21

Similar Documents

Publication Publication Date Title
US3208260A (en) Rolling mill
US2037210A (en) Roll changing apparatus
US3180125A (en) Roll changing apparatus
US3782161A (en) Apparatus for dismantling and assembling roll assemblies for a 4-high rolling mill
US3438996A (en) Rolling mills
US3566498A (en) Method for changing the rolls of a rolling mill and apparatus for applying the method
US3196658A (en) Roll changing rig
EP0057101B1 (en) Rolling mill stand
US2338285A (en) Turnover device
US3583195A (en) Roll changing apparatus
US3217526A (en) Rolling mills roll change
US3905485A (en) Roll changing device for a rolling mill and the like
US3699796A (en) Work roll changers
US4399680A (en) Universal rolling mill
JPH0223241B2 (US08124317-20120228-C00060.png)
US3436945A (en) Roll-changing apparatus for a rolling mill
US3525244A (en) Method and apparatus for changing the rolls of a universal rolling mill
US3043170A (en) Rolling mill and retractable stand therefor
US3738142A (en) Rolling mill
US3583194A (en) Horizontal roll stand for slab mill
US3383897A (en) Vertical mill
US3926027A (en) Roll changing apparatus for a rolling mill or the like
US3020628A (en) Apparatus for disassembling top roll bearing riders
US4136545A (en) Rolling mill stand
US3222901A (en) Rolling mill