EP1322435B1 - Procede de commande des forces axiales produites entre les cylindres de laminage - Google Patents

Procede de commande des forces axiales produites entre les cylindres de laminage Download PDF

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Publication number
EP1322435B1
EP1322435B1 EP01970051A EP01970051A EP1322435B1 EP 1322435 B1 EP1322435 B1 EP 1322435B1 EP 01970051 A EP01970051 A EP 01970051A EP 01970051 A EP01970051 A EP 01970051A EP 1322435 B1 EP1322435 B1 EP 1322435B1
Authority
EP
European Patent Office
Prior art keywords
rolls
working
roll
crossing
shifting
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
EP01970051A
Other languages
German (de)
English (en)
Other versions
EP1322435A1 (fr
Inventor
Paolo Bobig
Francesco Stella
Fausto Drigani
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.)
Danieli and C Officine Meccaniche SpA
Original Assignee
Danieli and C Officine Meccaniche SpA
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 Danieli and C Officine Meccaniche SpA filed Critical Danieli and C Officine Meccaniche SpA
Publication of EP1322435A1 publication Critical patent/EP1322435A1/fr
Application granted granted Critical
Publication of EP1322435B1 publication Critical patent/EP1322435B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • 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
    • B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
    • B21B13/023—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally the axis of the rolls being other than perpendicular to the direction of movement of the product, e.g. cross-rolling
    • 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
    • B21B13/14—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls
    • B21B13/142—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls by axially shifting the rolls, e.g. rolls with tapered ends or with a curved contour for continuously-variable crown CVC
    • 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
    • B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
    • B21B2013/026—Quinto, five high-stands
    • 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
    • B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
    • B21B2013/028—Sixto, six-high stands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/02—Shape or construction of rolls
    • B21B27/021—Rolls for sheets or strips
    • B21B2027/022—Rolls having tapered ends
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • B21B37/40—Control of flatness or profile during rolling of strip, sheets or plates using axial shifting of the rolls

Definitions

  • the invention refers to a method to reduce the axial forces generated between the rolling rolls in a five-high or six-high stand, having a pair of working rolls (WR) associated with a shifting mechanism, a corresponding pair of back-up rolls (BUR), and at least one intermediate roll (IR) associated at least with a crossing mechanism.
  • the intermediate roll is generally crossed.
  • the "sign" of the angle of crossing is determined by the direction of shifting during rolling.
  • the method according to the invention provides that WR shifting and IR crossing are suitably controlled so as to reduce the axial forces between the intermediate roll and the working roll, during the shifting of the working rolls, in the rolling step.
  • the working rolls are associated both with a bending system, positive and negative, and also with a shifting system, and the intermediate roll is associated with a crossing system.
  • the state of the art also includes a method to control the planarity of plane rolled products wherein the intermediate roll is also associated with a positive or negative bending system.
  • the working rolls can also be provided with bevels, hollows and/or tapers at their edges, in order to solve the problem of edge-drop of the rolled products, inevitably the tapers, due to the pressure of contact between the rolls, also generate further axial components which are added to those generated by the shifting of the working roll and the crossing of the intermediate roll.
  • US-A-6.012.319 discloses a method which controls independently the crossing angles of the work rolls and of the relative intermediate rolls, in order to obtain relative different working conditions during a rolling program.
  • the prior art method only controls the crossing angles of the work rolls and of the relative intermediate rolls.
  • the work rolls and the intermediate rolls are inclined (crossed) in opposite directions with respect to each other, with different crossing angles.
  • the present Applicant has devised, planned and perfected the method according to the invention to reduce the axial forces generated between the rolling rolls during the operation to modify the axial position or to shift the working rolls during the rolling operation.
  • the crossing of the intermediate roll generates axial thrusts: both on the intermediate roll itself, on the working roll and also on the back-up roll.
  • the forces F BUR and F WR (Fig. 1) generated are the function of various parameters, particularly the rolling force, the coefficient of friction between the rolls and hence of the lubrication and surface condition of the rolls, and finally the angle of crossing.
  • the intermediate roll receives a thrust equal to the difference between F BUR and F WR . If the coefficients of friction between the working roll and intermediate roll and between the intermediate roll and the back-up roll are about equal, the axial thrust is limited.
  • the main technical problem which the present invention proposes to solve is connected to the sizing of the axial thrust bearing for each working roll.
  • the space available to insert the bearing is limited and therefore problems may arise concerning the duration of the bearing.
  • the working roll is provided with an appropriate bevel, or taper, which is able to be positioned so as to decrease the reduction in thickness at the edges (referred to the centerline of the rolling stand), as shown in Fig. 1.
  • the working roll is equipped with a shifting device, so as to make it possible to position the bevel in correspondence with the edge of the strip which, generally, has a width which varies from a minimum to a maximum, for example from 800 to 1600 mm, according to the coil of strip to be produced.
  • the production program is normally made following a procedure of progressive reduction, starting at the beginning of the rolling session from a greater initial width l max which, coil after coil, is subsequently and gradually reduced until it reaches the final width l min , as shown schematically in Fig. 5.
  • This procedure is made to prevent the modification to the profile of the working rolls, generated by the wear caused by rolling the previous strips (Figs. 6a and 6b), from damaging the strip being rolled now.
  • the shifting movement in the axial direction made during rolling, generates a force of friction between the strip and each working roll, so that each working roll is subject to a force F s in the opposite direction to that of the axial movement.
  • said shifting of the working rolls (11a, 11b) is made during rolling, and said WR shifting and said IR crossing are controlled by control means (30) so as the axial force (F S ) generated between the product (12) being rolled and the corresponding working roll (11a) due to the shifting of the latter is in the opposite direction to the axial force (F WR ) generated by the crossing of the intermediate roll (15a) with respect to the corresponding working roll (11a).
  • One purpose of the invention is therefore to achieve a method to reduce to a minimum the axial forces generated between the rolls of a rolling stand, particularly but not exclusively during the operation to axially position the working rolls when there is a change in the strip width, and which therefore allows to increase the working life of the members associated with the rolling rolls, like the axial thrust bearings.
  • the method to control the axial forces generated between the rolls of a rolling stand comprising at least a pair of working rolls, a corresponding pair of back-up rolls and at least an intermediate roll located between one of the working rolls and a corresponding back-up roll, axial translation means associated with at least one of the working rolls to translate it axially, provides crossing means associated with said intermediate roll to arrange it with its longitudinal axis inclined (IR crossing), that is to say, rotated on a horizontal plane, with respect to the longitudinal axes of the working rolls and the back-up rolls.
  • IR crossing longitudinal axis inclined
  • the method provides that both WR shifting and IR crossing are controlled by control means which act on the axial translation means of the working rolls, during rolling, so that the axial force generated between the intermediate roll and the corresponding working roll due to the shifting of the latter is in the opposite direction to the axial force generated by the crossing of the intermediate roll.
  • a rolling stand 10 able to adopt a method according to the invention comprises a pair of working rolls 11a, 11b between which the plane product 12 to be rolled, consisting for example of a steel strip, is able to pass.
  • the rolling stand 10 is of the so-called six-high type, and comprises a pair of intermediate rolls 15a, 15b positioned between the working rolls 11a, 11b and the back-up rolls 13a, 13b.
  • the rolling stand 10 can comprise only one intermediate roll, for example the upper 15a, and thus become a five-high stand.
  • a shifting mechanism 16 Associated with at least one working roll 11a or 11b, but advantageously both, there is a shifting mechanism 16, of a conventional type and not shown in detail in the drawings, which is able to move the corresponding working roll 11a, 11b along the horizontal plane on which its longitudinal axis 21a, 21b lies, thus achieving the axial translation of one working roll 11a with respect to the other 11b.
  • a bending mechanism 17 associated with at least one working roll 11a or 11b, but advantageously both, there is also a bending mechanism 17, of a conventional type and not shown in detail in the drawings, which is able to bend the corresponding working roll 11a, 11b in one direction and the other with respect to the horizontal plane on which their longitudinal axis 21a, 21b lies at rest, and thus obtain a controlled bending thereof, both positive and negative.
  • the working rolls 11a and 11b are also provided, at at least one end, with bevels 18 suitably configured to control the profile at the edges of the rolled product 12.
  • the intermediate rolls 15a, 15b are associated with a crossing mechanism 19, of a conventional type and not shown in detail in the drawings, which is able to incline them around a vertical axis 26 by a desired angle ⁇ both in one direction and the other with respect to the working rolls 11a, 11b and the back-up rolls 13a, 13b, maintaining their longitudinal axes 23a, 23b on the same horizontal plane PIR parallel to the rolling plane on which the rolled product 12 lies.
  • Each intermediate roll 15a, 15b is also associated with a bending mechanism 20, of a conventional type and not shown in detail in the drawings, which is able to bend the corresponding intermediate roll in one direction and the other with respect to the horizontal plane PIR on which their longitudinal axis 25a, 25b lies at rest, and thus obtain a controlled bending, both positive and negative.
  • a bending mechanism 20 of a conventional type and not shown in detail in the drawings, which is able to bend the corresponding intermediate roll in one direction and the other with respect to the horizontal plane PIR on which their longitudinal axis 25a, 25b lies at rest, and thus obtain a controlled bending, both positive and negative.
  • No device to control and/or modify their position or profile is associated with the back-up rolls 13a, 13b, so their longitudinal axes 23a, 23b normally remain in their nominal position.
  • Each rolling roll 11a, 11b, 13a, 13b, 15a and 15b is subjected to axial forces generated during the rolling of the product 12, mainly due to the WR shifting and IR crossing, and also due to the bevels 18 and the shape that the rolled product assumes at the edges.
  • the working rolls 11a and 11b are subjected both to axial forces F WR , due to the crossing of the intermediate rolls 15a and 15b, and also to the axial forces F S , due to the shifting of the working rolls 11a and 11b.
  • the axial thrust caused by said crossing changes direction according to the sign of the angle of crossing.
  • axial thrust bearings 28 of a conventional type, are associated with every rolling roll.
  • a control unit 30 is connected at least to the WR shifting mechanisms 16 and to the IR crossing mechanisms 19, in order to control said mechanisms 16 and 19 and act thereon in a suitable fashion, to reduce at least the axial forces which act on the working rolls 11a and 11b during the axial repositioning of the latter.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Crushing And Grinding (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
  • Friction Gearing (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Metal Rolling (AREA)

Claims (1)

  1. Procédé de commande des forces axiales produites entre les cylindres d'un poste de laminage (10) pour produits plats (12) comportant au moins deux cylindres de travail (11la, 11b), deux cylindres d'appui correspondants (13a, 13b) et au moins un cylindre intermédiaire (15a) placé entre l'un desdits cylindres de travail (11a) et un cylindre d'appui correspondant (13b), des moyens de translation axiale (16) associés auxdits cylindres de travail (11a) pour déplacer en translation axiale lesdits cylindres de travail (décalage WR, pour Working Rolls = cylindres de travail), des moyens de croisement (19) associés audit cylindre intermédiaire (15a) pour disposer l'axe longitudinal (25a) dudit cylindre intermédiaire (15a) en position inclinée, c'est-à-dire en le faisant pivoter sur un plan horizontal d'un angle défini (a) par rapport à l'axe longitudinal (21a, 21b, 23a, 23b) desdits cylindres de travail (11a, 11b) et desdits cylindres d'appui (13a, 13b) (croisement IR, pour Intermediate Roll = cylindre intermédiaire), le procédé étant caractérisé en ce que ledit décalage des cylindres de travail (11a, 11b) s'effectue pendant le laminage, et en ce que ledit décalage WR et ledit croisement IR sont commandés par des moyens de commande (30), de sorte que la force axiale (FS) produite entre le produit (12) en cours de laminage et le cylindre de travail correspondant (11a) sous l'effet du décalage de ce dernier s'exerce en direction opposée à la force axiale (FWR) produite par le croisement du cylindre intermédiaire (15a) par rapport au cylindre de travail correspondant (11a).
EP01970051A 2000-09-25 2001-09-24 Procede de commande des forces axiales produites entre les cylindres de laminage Expired - Lifetime EP1322435B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT2000UD000176A IT1315117B1 (it) 2000-09-25 2000-09-25 Metodo per controllare le forze assiali che si generano fra icilindri di laminazione.
ITUD000176 2000-09-25
PCT/IB2001/001740 WO2002024363A1 (fr) 2000-09-25 2001-09-24 Procede de commande des forces axiales produites entre les cylindres de laminage

Publications (2)

Publication Number Publication Date
EP1322435A1 EP1322435A1 (fr) 2003-07-02
EP1322435B1 true EP1322435B1 (fr) 2006-06-07

Family

ID=11460398

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Application Number Title Priority Date Filing Date
EP01970051A Expired - Lifetime EP1322435B1 (fr) 2000-09-25 2001-09-24 Procede de commande des forces axiales produites entre les cylindres de laminage

Country Status (7)

Country Link
US (1) US20030177807A1 (fr)
EP (1) EP1322435B1 (fr)
AT (1) ATE328678T1 (fr)
AU (1) AU2001290169A1 (fr)
DE (1) DE60120439T2 (fr)
IT (1) IT1315117B1 (fr)
WO (1) WO2002024363A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11919059B2 (en) 2019-01-28 2024-03-05 Primetals Technologies Germany Gmbh Changing the effective contour of a running surface of a working roll during hot rolling of rolling stock in a roll stand to form a rolled strip
EP3685930B1 (fr) * 2019-01-28 2021-11-24 Primetals Technologies Germany GmbH Changement local de la fente de laminage dans la zone marginale d'une bande laminée

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4378685A (en) * 1981-01-26 1983-04-05 Nippon Steel Corporation Method of setting axial position of loosely carried sleeve in a rolling mill
JPS632507A (ja) * 1986-06-20 1988-01-07 Nippon Steel Corp 圧延機
JP3082817B2 (ja) * 1993-07-15 2000-08-28 三菱重工業株式会社 圧延機
JP3040638B2 (ja) * 1993-07-15 2000-05-15 三菱重工業株式会社 圧延方法
US6286354B1 (en) * 1996-04-03 2001-09-11 Hitachi, Ltd. Rolling mill and rolling method and rolling equipment
TW358758B (en) * 1996-12-27 1999-05-21 Hitachi Ltd Rolling mill and method of the same
JP2000015313A (ja) * 1998-07-02 2000-01-18 Hitachi Ltd 圧延機および圧延方法
IT1310880B1 (it) * 1999-07-20 2002-02-22 Danieli Off Mecc Metodo per il controllo statico e dinamico della planarita'di prodotti piani laminati
IT1310879B1 (it) * 1999-07-20 2002-02-22 Danieli Off Mecc Gabbia di laminazione per prodotti piani e metodo peril controllo della planarita' di detti prodotti

Also Published As

Publication number Publication date
ITUD20000176A0 (it) 2000-09-25
EP1322435A1 (fr) 2003-07-02
ATE328678T1 (de) 2006-06-15
IT1315117B1 (it) 2003-02-03
ITUD20000176A1 (it) 2002-03-25
DE60120439D1 (de) 2006-07-20
WO2002024363A1 (fr) 2002-03-28
US20030177807A1 (en) 2003-09-25
AU2001290169A1 (en) 2002-04-02
DE60120439T2 (de) 2007-01-04

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