US3818742A - Rolling mills - Google Patents

Rolling mills Download PDF

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Publication number
US3818742A
US3818742A US00322123A US32212373A US3818742A US 3818742 A US3818742 A US 3818742A US 00322123 A US00322123 A US 00322123A US 32212373 A US32212373 A US 32212373A US 3818742 A US3818742 A US 3818742A
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US
United States
Prior art keywords
frame
work roll
sub
assembly
rolls
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
US00322123A
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English (en)
Inventor
J Maltby
D Stubbs
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British Steel Corp
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British Steel Corp
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Filing date
Publication date
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Publication of US3818742A publication Critical patent/US3818742A/en
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Classifications

    • 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
    • B21B13/005—Cantilevered roll stands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2203/00—Auxiliary arrangements, devices or methods in combination with rolling mills or rolling methods
    • B21B2203/22—Hinged chocks

Definitions

  • ABSTRACT A four-high rolling mill stand for rolling metal bar stock.
  • the work rolls are carried in work roll arms pivotally mounted to one another about a pivot axis and forming a mill sub-assembly.
  • An adjusting device is provided for adjusting the effective position of the I pivot axis relative to one of the work roll arms.
  • sub-assembly is removably mounted to the frame by a pin passing through a bore in the frame and a bore in the sub-assembly.
  • the support or back-up rolls are rotatably mounted in the frame, the axis of rotation of the support rolls being movable with respect to the frame for alignment to support rolls on their associated work rolls.
  • British Patent Specification No. 1,240,658 discloses and claims such a mill and particularly describes a mill wherein each work roll together with its associated support roll is carried for rotation in an individual arm pivotally mounted in the mill frame,the two arms being mounted for pivotal movement about a single fixed pivot axis.
  • This arrangement although of advantage for small v work rolls or with preloaded work roll thrust bearings leads to substantial design complexity in the neighbourhood of that pivot axis, to consequent possible mechanical weaknesses under heavy load, and to difficulty of access for repair and maintenance of the parts of the millnear the pivotaxis. This is particularly true where an eccentric pivot pin arrangement is uti-- lised as disclosed and claimed in our co-pending Patent Application No. 125,678, filedMar. 18, 1971.
  • An object of the present invention is to provide an improved mill design taking into account the above and other factors.
  • v i v According to the present invention there is provided a rolling mill stand including a frame, two work rolls drivably carried in individual arms pivotally mounted one to the other to form'a mill sub-assembly, whereby.
  • the work rolls are preferably secured co-axially to the free ends of work roll drive shafts journalled in the respective arms and the pivot axis then extends perpendicular to and spaced apart from these shafts, and preferably also passes between the axes of the two drive shafts, substantially equi-distant therefrom,
  • the support rolls are preferably rotatably carried in arms pivotally mounted in the frame and these support roll amis are desirably mounted to the frame for pivotal movement about individual spaced apart axes.
  • Such arrangements are disclosed in our co-pending Patent Application No. 3887/72 of even date entitled Rolling Mills.”
  • the sub-assembly is preferably removably mounted to the mill frame in a manner permitting movement of at least the roll end portion of the arms to a limited extent in a direction parallel to the stockpass line, and a load sensing device being provided between said portion and the frame to provide in use a signal embodying a measure of the tension in the stock adjacent the mill between the work rolls.
  • FIG. 1 is a part sectional side elevation of one stand of a close coupled twin stand four high rolling mill according to the invention
  • FIG. 2 is a longitudinal part sectional view of the upper work roll arm
  • FIG. 3 is a top plan view of the sub-assembly of the two work roll arms
  • FIG. 4 is a view similar to FIG. 1 showing the subassembly partly removed from the mill, and
  • FIG. 5 is a part sectional rear elevation of the stand of FIG. 1 shown in two positions to either side of the vertical centre line;
  • FIG. 6 is an enlarged fragmentary view of the subassembly latch pin.
  • FIG. 1 one stand ,of a close coupled twin stand four high cantilever rod or bar rolling mill.
  • the two stands of the mill are arranged in the non twist mode as more fully described and illustrated in our above referenced copending Application.
  • the two stands have a common basic frame including a pair of frame standards l3, l4 and upper and lower cross beams 15, 16.
  • the standards are secured to the side frame webs 17, 18 which are in the shape of right angle isosceles triangles and each have a rearward flange l8 and a base flange 19 for securing to the basic frame of the mill.
  • Each stand comprises a pair of work rolls 20, 21 backed up by respective support rolls 22, 23.
  • the work rolls are releasably secured to the free ends of drive shafts 24, 25 which are rotatably carried in respective work roll arms 26, 27 and driven through couplings 28, 29 by electric motors (not shown).
  • the two arms 26, 27 are pivotally mounted one to the other by pivot pin 30 to fonn a sub-assembly described more fully below.
  • the support rolls 22, 23 are rotatably mounted to and carried by upper and lower support roll arms 35, 36.
  • Each arm comprises a central web 37 with upper and lower flanges 38, 39 secured to a massive forward chock 40.
  • Each arm is mounted at its rearward end for pivotal movement about a respective pivot pin 41 by means of an eccentric pivot pin arrangement 100.
  • the mounting of the support rolls, the eccentric pin arrangement and other details concerning the support rolls and support roll arms are more fully disclosed in our co-pending Application of even date.
  • the two pivot pins 41 are spaced apart by the minimum practicable distance necessary to allow the work roll sub-assembly to pass freely there between as illustrated in FIGS. 1 and 4. This minimises scrubbing between the work rolls and support rolls.
  • the two arms 26, 27 are generally similar in shape, except that at the rearward end the upper arm 26 (see FIGS. 2 and 3) has depending spaced apart lugs 50 and the lower arm 27 has upwardly extending lugs 51.
  • Lugs 50 are a close sliding fit between lugs 51, (as seen in FIG. 3.)
  • the lugs are bored to accommodate an eccentric pivot pin 30.
  • the lower arm is provided at its rearward lower end with an additional lug 52 having a bore 53.
  • the bore 53 has chamferred ends 54, as shown in the enlarged scrap view of FIG. 6.
  • the bore 53 registers with a bore 55 in a bracket 59 secured to the side frame web 17, and a single latch pin 56 having a chamferred tip 57 is received in the bores 53, 55 to hold the sub-assembly in position in the mill.
  • the chamferred ends 54 of bore 53 permit limited movement on the latch pin 56 of at least the roll end portion of the work roll arms in a direction parallel to the stock pass line.
  • the eccentric pivot pin 30 has two end lengths having an outer surface centered on a first axis 60 and a central length centered on a second axis 61.
  • the lengths centered on axis 60 are those working in the bores of the lugs 51, and the lengths centered on axis 61 is that working in the bores of the lugs 50.
  • a lever arm 62 secured to one end of pin 30 and a drive arm 63 is pivoted to the remote end of arm 62.
  • Arm 63 can be adjusted substantially axially by slackening, rotating, and retightening, control handles 64 which lock on either side of a bracket 65 secured to the mill frame. It will be appreciated that axial movement of arm 63 causes rotation of pin 30 through a small arc.
  • the axes 60, 61 are aligned above one another as seen in FIG.
  • the upper work roll drive shaft 24 is rotatably mounted within its arm 26 by means of a rearward thrust and radial bearing arrangement 66 and a forward radial bearing arrangement 67.
  • a sleeve 68 is engaged between the bearings to transmit axial thrust from the forward to the rearward bearing.
  • the work roll is releasably secured to the free end of the work roll drive shaft 24 by means of a hydraulically expandable bolt 69 extending through an axial bore 70 in the roll and threadedly received in a threaded bore 71 in the end of the shaft.
  • the use of such a bolt ensures very secure mounting of the roll, with good axial position accuracy and ready releasability. Attention is ,drawn to Patent Specification 1,240,656 in this connection.
  • the lower work roll drive shaft is mounted in its am in a similar manner and the lower work roll mounted to its shaft in a similar manner.
  • the upper arm 26 is provided with two electro mechanical transducers, such as linear variable differential transformers, 74, 75 secured thereto in the angles of the outer surface of the arm immediately behind the forward bearing block 76 thereof.
  • These transducers have plungers extending from sealed housings and acting on adjustable mechanical stocks, (not shown) in the corresponding situations on the lower work roll arm. The stocks are adjusted so the plunger contacts the stock level with the stock pass line as seen in FIG. 1. Electrical connections 77 extend to the transducers. This mounting position gives good protection to the transducers against incidental mechanical damage and dirt and in addition they are desirably close to the stock pass line. It will be appreciated that, in use, signals from these transducers represent the work gap between the work rolls, and that these signals are used in controlling, or modulating, the work gap during a rolling operation.
  • FIG. 3 also illustrates, schematically, a lateral piston and cylinder loading device 80 disposed centrally of the height of the bearing block 76 and housed in a recess therein.
  • Two load cells 81 (only one is visible in FIG. 3) are disposed one above the other in a recess in the opposite side face of bearing block 76.
  • the bearing block of the lower arm 37 is similarly equipped with a device 80 and two cells 81.
  • the bearing blocks 76 are a close fit between the two frames standards l3, 14.
  • the loading device 80 is pressurised substantially to take up the lateral clearance so that the sensors of the load cells 81 are pre-loaded against stops 82. It will be appreciated that, in use, signals from the load cells represent the tension, positive or negative, in the stock adjacent the mill stand.
  • FIG. 3 also shows in dotted outline the location of two piston and cylinder devices 84 which are housed within the bearing block 76 of the lower work roll.
  • the devices 84 act against the upper bearing block to force the blocks apart. During use of the mill this pre-loads the work rolls against the support rolls, and these devices may also be used to separate the work rolls for access thereto during work roll changing operations.
  • the rolling mill stand is shown with the sub-assembly in the course of removal from its installed position.
  • the single off-set latch pin 56 is withdrawn by handle 101, the drive shafts 24, 25 un-coupled, and the eccentric drive arm 63 un-coupled from lever arm 62.
  • the sub-assembly is then free of all mechanical connection to the remainder of the mill and can be withdrawn as a whole forwardly through the gap defined by the support rolls and the standards 13, 14.
  • a counter balanced porter bar and crane would be used for this operation, which is characterised by its relative speed and simplicity.
  • a guide plate 90 is welded on to housing side member.
  • Lateral radiused cheeks (not shown) are provided secured to the frame webs 17, 18 one at each side of the sub-assembly towards the rearward end thereof to guide the rear end of the sub-assembly into its final installed position.
  • the chamferred end of latch pin 56 facilitates its insertion to lock the sub-assembly in position. This pin does not need any substantial strength since all operational load ing as between the work roll arms is taken up by pin 30.
  • the forward end of the sub-assembly is laterally located by the fit of the blocks 76 as shown in FIG. 3.
  • the two support roll arms may have to be pivotally moved to their most widely separated position in order to permit removal of the sub assembly. This is accomplished by pressurisation of the piston and cylinder sep- I arating devices (not shown) which act directly between extensions of the forward support roll chocks 40 (described in our co-pending Application).
  • the loading device 86 is de-pressurised and the wedge device 87 retracted.
  • the advantage of the described arrangement of pivoting the two work roll arms direction to one another is that this greatly simplifies and enhances the stiffness as between the two work roll arms.
  • the axial stiffness path from one work roll to the other through the pivot 30 is reasonably short, direct and simple. This stiffness is important for accuracy of the rolled stock.
  • the arrangement would be more stiff if the pivot axis were closest to the stock pass line, but this would tend to decrease the pass shape accuracy and increase scrubbing between the rolls and their support rolls due to the pivot action of the arms when different diameter rolls are used.
  • Proper adjustment of the eccentric pivot pin 30 serves to align the work roll grooves.
  • the described arrangement also uses a single pin 30 instead of two opposite pins, and moreover the pin 30 is disposed schematically between the two work roll axes, which again aidsaccuracy in the rolled stock.
  • the described arrangement wherein the support roll arms are pivotally mounted above and below the subassembly alsoserves to reduce the number of lateral clearances and consequent complexity and lack of stiffness in the neighbourhood of the pivotal mountings.
  • a rolling mill stand including,
  • latch means independent of the pivotal mounting means, extending between the mill frame and the sub-assembly for releasably holding the subassembly to the frame.
  • the latch means includes a lug extending from one work roll arm, said lug having a first bore extending substantially perpendicular to the axis of said work roll arm,
  • removable pin means passing through said first and second bores when said sub-assembly is positioned in the frame so as to hold said sub-assembly in the frame.
  • a rolling mill stand including a guide plate mounted on the frame, and extending between one work roll arm and the frame, which in use guides the sub-assembly into its position in the stand.
  • a rolling mill stand according to claim 2 in which said first bore is chamferred to permit movement of at least the roll end portion of the work roll arms to a limited extent in a direction parallel to the stock pass line, and a load sensing device is disposed between said roll end portion of the work roll arms and the frame to provide in use a signal embodying a measure of the tension in the stock adjacent the mill stand.
  • a rolling mill stand according to claim 1 in which the means for pivotally mounting the two work roll arms comprises a pivot pin having an axis extending normal to the axis of the work roll arms.
  • a rolling mill stand according to claim 5 in which said pivot pin includes two eccentric surfaces and the work roll arms are pivotally mounted with one on each eccentric surface.
  • a subassembly adapted to be positioned in said frame between said support rolls and releasably latched to said frame, said sub-assembly comprising two drivable work rolls, a work roll arm operably secured to each on said work rolls,

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
US00322123A 1972-01-27 1973-01-09 Rolling mills Expired - Lifetime US3818742A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB388872A GB1385495A (en) 1972-01-27 1972-01-27 Rolling mills

Publications (1)

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US3818742A true US3818742A (en) 1974-06-25

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US00322123A Expired - Lifetime US3818742A (en) 1972-01-27 1973-01-09 Rolling mills

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US (1) US3818742A (xx)
JP (1) JPS4884073A (xx)
AU (1) AU469085B2 (xx)
CA (1) CA963702A (xx)
DE (1) DE2303708A1 (xx)
FR (1) FR2169299B1 (xx)
GB (1) GB1385495A (xx)
IT (1) IT977673B (xx)
SE (1) SE383482B (xx)
ZA (1) ZA73140B (xx)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3946587A (en) * 1973-12-06 1976-03-30 Davy-Loewy Ltd. Rolling mills
US3964282A (en) * 1972-05-19 1976-06-22 British Steel Corporation Rolling mills
US4116028A (en) * 1976-11-02 1978-09-26 Sumitomo Metal Industries, Ltd. Rolling mill
US4198841A (en) * 1977-07-26 1980-04-22 Barkov Leonid A Roll mill stand
US4312209A (en) * 1980-05-19 1982-01-26 Sack Gmbh Method for operating a strip rolling mill
US4457155A (en) * 1982-03-03 1984-07-03 White Consolidated Industries, Inc. Overhung bar rolling mill stand and two-axis gauge control system
US4785653A (en) * 1985-10-15 1988-11-22 Centro-Morgardshammar Ab Wire rod block
US4962655A (en) * 1988-02-25 1990-10-16 Danieli & C. Officine Meccaniche Spa Rolling stand with rolling rings supported as a cantilever and having their axes at an angle to each other
US20060230799A1 (en) * 2003-03-20 2006-10-19 Shigeru Ogawa Method and apparatus for rolling metalic plate material

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6028562B2 (ja) * 1980-03-03 1985-07-05 新日本製鐵株式会社 棒線用圧延機

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1822697A (en) * 1929-10-04 1931-09-08 Niagara Machine & Tool Works Sheet-metal working machine
US1900032A (en) * 1930-10-25 1933-03-07 Worthington Warren Bar mill
US2601793A (en) * 1947-04-23 1952-07-01 Erwin Loewy Rolling mill
US3587267A (en) * 1967-11-15 1971-06-28 British Iron Steel Research Stock tension control in rolling mills
US3613428A (en) * 1967-11-15 1971-10-19 British Iron Steel Research Rolling mills

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1314027A (fr) * 1961-12-05 1963-01-04 Perfectionnements aux laminoirs à cylindres de travail déportés, permettant le laminage réversible sans soutiens supplémentaires des cylindres de travail
FR1465519A (fr) * 1965-03-09 1967-01-13 Wtz Feikeramischen Ind Laminoir-finisseur à cylindres inclinés à 45deg. montés en porte-à-faux
BE757269A (fr) * 1969-10-18 1971-03-16 Masch & Werkzeugbau Gmbh Dispositif servant a changer les cylindres de travail dans les cages delaminoirs

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1822697A (en) * 1929-10-04 1931-09-08 Niagara Machine & Tool Works Sheet-metal working machine
US1900032A (en) * 1930-10-25 1933-03-07 Worthington Warren Bar mill
US2601793A (en) * 1947-04-23 1952-07-01 Erwin Loewy Rolling mill
US3587267A (en) * 1967-11-15 1971-06-28 British Iron Steel Research Stock tension control in rolling mills
US3613428A (en) * 1967-11-15 1971-10-19 British Iron Steel Research Rolling mills

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3964282A (en) * 1972-05-19 1976-06-22 British Steel Corporation Rolling mills
US3946587A (en) * 1973-12-06 1976-03-30 Davy-Loewy Ltd. Rolling mills
US4116028A (en) * 1976-11-02 1978-09-26 Sumitomo Metal Industries, Ltd. Rolling mill
US4198841A (en) * 1977-07-26 1980-04-22 Barkov Leonid A Roll mill stand
US4312209A (en) * 1980-05-19 1982-01-26 Sack Gmbh Method for operating a strip rolling mill
US4457155A (en) * 1982-03-03 1984-07-03 White Consolidated Industries, Inc. Overhung bar rolling mill stand and two-axis gauge control system
US4785653A (en) * 1985-10-15 1988-11-22 Centro-Morgardshammar Ab Wire rod block
US4962655A (en) * 1988-02-25 1990-10-16 Danieli & C. Officine Meccaniche Spa Rolling stand with rolling rings supported as a cantilever and having their axes at an angle to each other
US5056345A (en) * 1988-02-25 1991-10-15 Danieli & C. Officine Meccaniche S.P.A. Rolling stand with rolling rings supported as a cantilever and having their axes at an angle to each other
US20060230799A1 (en) * 2003-03-20 2006-10-19 Shigeru Ogawa Method and apparatus for rolling metalic plate material
US7310982B2 (en) * 2003-03-20 2007-12-25 Nippon Steel Corporation Rolling method and rolling apparatus for flat-rolled metal materials

Also Published As

Publication number Publication date
SE383482B (sv) 1976-03-15
AU469085B2 (en) 1976-02-05
CA963702A (en) 1975-03-04
AU5100773A (en) 1974-07-11
IT977673B (it) 1974-09-20
FR2169299B1 (xx) 1977-08-26
FR2169299A1 (xx) 1973-09-07
GB1385495A (en) 1975-02-26
DE2303708A1 (de) 1973-08-30
JPS4884073A (xx) 1973-11-08
ZA73140B (en) 1973-09-26

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