WO2002024363A1 - 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
WO2002024363A1
WO2002024363A1 PCT/IB2001/001740 IB0101740W WO0224363A1 WO 2002024363 A1 WO2002024363 A1 WO 2002024363A1 IB 0101740 W IB0101740 W IB 0101740W WO 0224363 A1 WO0224363 A1 WO 0224363A1
Authority
WO
WIPO (PCT)
Prior art keywords
rolls
working
roll
crossing
axial
Prior art date
Application number
PCT/IB2001/001740
Other languages
English (en)
Inventor
Paolo Bobig
Francesco Stella
Fausto Drigani
Original Assignee
Danieli & C. Officine Meccaniche S.P.A.
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 & C. Officine Meccaniche S.P.A. filed Critical Danieli & C. Officine Meccaniche S.P.A.
Priority to AU2001290169A priority Critical patent/AU2001290169A1/en
Priority to EP01970051A priority patent/EP1322435B1/fr
Priority to DE60120439T priority patent/DE60120439T2/de
Publication of WO2002024363A1 publication Critical patent/WO2002024363A1/fr

Links

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.
  • each intermediate roll with respect to the working rolls and back-up rolls inevitably generates thrusts or axial forces both on the intermediate roll, on the corresponding working roll and also on the corresponding back-up roll.
  • 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 .
  • 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 BDR and F ⁇ (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 ⁇ . 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.
  • a shifting device that is, where the strip is rolled continuously and the operation to divide it into coils is made downstream of the rolling mill, it is necessary to reposition the working rolls following the sequence of the variations in width between one coil and the next. Since the coils entering the rolling mill are welded together in succession, that is, with the trailing end of one coil against the leading end of the other, this repositioning is carried out without stopping the rolling process.
  • 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 movement of the working rolls is carried out in the axial direction during rolling. This movement is done in correspondence with the change in width from one coil to the next.
  • 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 . Therefore, each working roll, during shifting, is subject to the axial forces F m and F s .
  • the intermediate rolls are crossed so that the two forces F ⁇ and F s have opposite directions, so as to avoid, during the shifting operations during rolling, further loading the thrust bearings of the working rolls, and consequently extend the duration thereof.
  • 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 .
  • Fig. 1 is a schematic front view of a six-high rolling stand able to adopt the method according to the invention
  • Fig. 2 is a schematic and partial side view of the rolling stand shown in Fig. 1;
  • Fig. 3 is an enlargement of the rolling stand in Fig. 1;
  • Fig. 4 is a graph of the development of the coefficient of friction between a working roll and an intermediate roll according to the crossing angle of the latter;
  • Fig. 5 is a schematic representation of the variation in the width of the plane product rolled in a particular rolling session;
  • Fig. 6a is a schematic representation of the profile of a working roll WR after "n" strips with a constant width;
  • Fig. 6b is a schematic representation of the effect which would be obtained on rolling a wider strip if the same rolling roll WR were used as in Fig. 6a.
  • a rolling stand 10 able to adopt a method according to the invention comprises a pair of working rolls 11a, lib 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, lib and the backup 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 lib, 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, lib 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 lib.
  • a bending mechanism 17 associated with at least one working roll 11a or lib, 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, lib 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 lib 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, lib 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, lib, 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 lib are subjected both to axial forces F ⁇ ., 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 lib.
  • 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 lib during the axial repositioning of the latter.
  • the shifting of the working rolls 11a and lib, in the axial direction is performed by the mechanisms 16 during rolling so that the two forces F ⁇ and F s have opposite directions, so as to avoid further loading the thrust bearings 28 and thus prolong their working life.

Landscapes

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

Abstract

L'invention concerne un procédé de commande des forces axiales produites entre les cylindres d'une cage de laminage (10) de produits plans (12), cette cage comprenant au moins une paire de cylindres de travail (11a, 11b), une paire correspondante de cylindre d'appui (13a, 13b), au moins un cylindre intermédiaire (15a) placé entre l'un des cylindres de travail (11a) et un cylindre d'appui correspondant (13b), des moyens de translation axiale (16) associés aux cylindres de travail (11a) et conçus pour une translation axiale de ces cylindres (décalage WR), des moyens de croisement (19) associés au cylindre intermédiaire (15a) et conçus pour incliner (croisement IR) l'axe longitudinal (25a) de ce cylindre, c'est-à-dire pour le faire pivoter sur un plan horizontal selon un angle déterminé (α) par rapport à l'axe longitudinal (21a, 21b, 23a, 23b) respectif des cylindres de travail (11a, 11b) et des cylindres d'appui (13a, 13b). Selon le procédé de l'invention, le décalage WR et le croisement IR sont commandés par des moyens de commande (30) de manière à réduire au minimum les forces axiales produites dans les cylindres de travail (11a, 11b), et par conséquence la charge axiale exercée sur les paliers de butée correspondants (28).
PCT/IB2001/001740 2000-09-25 2001-09-24 Procede de commande des forces axiales produites entre les cylindres de laminage WO2002024363A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU2001290169A AU2001290169A1 (en) 2000-09-25 2001-09-24 Method to control the axial forces generated between the rolling rolls
EP01970051A EP1322435B1 (fr) 2000-09-25 2001-09-24 Procede de commande des forces axiales produites entre les cylindres de laminage
DE60120439T DE60120439T2 (de) 2000-09-25 2001-09-24 Verfahren zur regelung der zwischen den walzwerkswalzen erzeugten axialkräfte

Applications Claiming Priority (2)

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.
ITUD2000A000176 2000-09-25

Publications (1)

Publication Number Publication Date
WO2002024363A1 true WO2002024363A1 (fr) 2002-03-28

Family

ID=11460398

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2001/001740 WO2002024363A1 (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

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS632507A (ja) * 1986-06-20 1988-01-07 Nippon Steel Corp 圧延機
JPH0732007A (ja) * 1993-07-15 1995-02-03 Mitsubishi Heavy Ind Ltd 圧延機
JPH0732002A (ja) * 1993-07-15 1995-02-03 Mitsubishi Heavy Ind Ltd 圧延方法
US6012319A (en) * 1996-12-27 2000-01-11 Hitachi, Ltd. Rolling mill and rolling method
JP2000015313A (ja) * 1998-07-02 2000-01-18 Hitachi Ltd 圧延機および圧延方法
WO2001005528A1 (fr) * 1999-07-20 2001-01-25 Danieli & C. Officine Meccaniche S.P.A. Procede de regulation statique et dynamique de la planarite de produits lamines plats
WO2001005527A1 (fr) * 1999-07-20 2001-01-25 Danieli & C. Officine Meccaniche S.P.A. Cage pour produits plans et procede permettant de controler la planarite de ces produits

Family Cites Families (2)

* 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
US6286354B1 (en) * 1996-04-03 2001-09-11 Hitachi, Ltd. Rolling mill and rolling method and rolling equipment

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS632507A (ja) * 1986-06-20 1988-01-07 Nippon Steel Corp 圧延機
JPH0732007A (ja) * 1993-07-15 1995-02-03 Mitsubishi Heavy Ind Ltd 圧延機
JPH0732002A (ja) * 1993-07-15 1995-02-03 Mitsubishi Heavy Ind Ltd 圧延方法
US6012319A (en) * 1996-12-27 2000-01-11 Hitachi, Ltd. Rolling mill and rolling method
JP2000015313A (ja) * 1998-07-02 2000-01-18 Hitachi Ltd 圧延機および圧延方法
WO2001005528A1 (fr) * 1999-07-20 2001-01-25 Danieli & C. Officine Meccaniche S.P.A. Procede de regulation statique et dynamique de la planarite de produits lamines plats
WO2001005527A1 (fr) * 1999-07-20 2001-01-25 Danieli & C. Officine Meccaniche S.P.A. Cage pour produits plans et procede permettant de controler la planarite de ces produits

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 012, no. 195 (M - 705) 7 June 1988 (1988-06-07) *
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 05 30 June 1995 (1995-06-30) *
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 04 31 August 2000 (2000-08-31) *

Also Published As

Publication number Publication date
EP1322435A1 (fr) 2003-07-02
US20030177807A1 (en) 2003-09-25
ITUD20000176A0 (it) 2000-09-25
IT1315117B1 (it) 2003-02-03
EP1322435B1 (fr) 2006-06-07
ATE328678T1 (de) 2006-06-15
DE60120439T2 (de) 2007-01-04
ITUD20000176A1 (it) 2002-03-25
DE60120439D1 (de) 2006-07-20
AU2001290169A1 (en) 2002-04-02

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