EP0226391A1 - Laminage de bandes - Google Patents

Laminage de bandes Download PDF

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Publication number
EP0226391A1
EP0226391A1 EP86309421A EP86309421A EP0226391A1 EP 0226391 A1 EP0226391 A1 EP 0226391A1 EP 86309421 A EP86309421 A EP 86309421A EP 86309421 A EP86309421 A EP 86309421A EP 0226391 A1 EP0226391 A1 EP 0226391A1
Authority
EP
European Patent Office
Prior art keywords
strips
rolls
mill
centre
line
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.)
Withdrawn
Application number
EP86309421A
Other languages
German (de)
English (en)
Inventor
Kenneth Thomas Lawson
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.)
Davy Mckee Sheffield Ltd
Original Assignee
Davy Mckee Sheffield Ltd
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
Priority claimed from GB858529919A external-priority patent/GB8529919D0/en
Priority claimed from GB858531651A external-priority patent/GB8531651D0/en
Application filed by Davy Mckee Sheffield Ltd filed Critical Davy Mckee Sheffield Ltd
Publication of EP0226391A1 publication Critical patent/EP0226391A1/fr
Withdrawn legal-status Critical Current

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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
    • B21B37/68—Camber or steering control for strip, sheets or plates, e.g. preventing meandering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/30—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process
    • B21B1/32—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
    • B21B1/34—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work by hot-rolling
    • 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
    • B21B2203/18—Rolls or rollers
    • B21B2203/187—Tilting rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2263/00—Shape of product
    • B21B2263/02—Profile, e.g. of plate, hot strip, sections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2267/00—Roll parameters
    • B21B2267/24—Roll wear

Definitions

  • the length of the work rolls is such that the demand for wide strip can be met.
  • the mill user usually has some orders for narrower width strip and so strips of various widths up to the maximum width are rolled on different occasions in the same mill. It is usual for the strip to travel along a path which is symmetrical with respect to the centre-line of the rolls. If there is a large order for strips of the same width, but which is considerably less than the maximum width which can be rolled in the mill, then the work rolls will tend to wear over a length equal to the strip width and there is pronounced wear in the regions of the edges of the strip. This leads to the strip which is being rolled having a profile which has enlarged edges and this is known as "edge build-up".
  • An object of the present invention is to distribute wear on the work rolls of a rolling mill stand over an increased proportion of the length of the work rolls.
  • successive strips, or successive groups of strips are passed between the rolls along different paths with respect to the centre-line of the rolls, such that the strips contact different portions of the roll surfaces.
  • the work rolls may be axially fixed and the strips are then presented to the rolls along different paths with respect to the centre-line of the rolls.
  • the strips pass through the rolls along these different paths and the strips contact different portions of the roll surfaces.
  • the rolls may be axially movable and the strips are presented to the rolls along a common track. However, by axially moving the rolls together axially with respect to the common track, the strips pass through the rolls along different paths such that the strips contact different portions of the roll surfaces.
  • successive strips, or successive groups of strips pass between the rolls along paths offset from the centre-line on one side of the mill, along a path through the centre-line of the mill and along paths offset from the centre-line on the other side of the mill.
  • successive strips, or groups of strips are progressively displaced from a path off-set by a maximum amount from the centre-line on one side of the mill, through the centre-line of the mill to a path offset by a maximum amount on the other side of the mill and the progressive displacement from side-to-side is repeated until all the strips of the particular width have been rolled.
  • Successive strips may be rolled along different paths or a group of, say, two or three strips are passed along one path and the next group of two or three strips are passed along the adjacent path.
  • This method of strip rolling distributes the work roll wear across a greater part of the length of the work rolls before the rolls have to be re-ground.
  • a rolling mill stand of a hot strip mill has a pair of work rolls 1, 3.
  • the length L of the barrel of each roll is such that the mill stand can roll strip of the required maximum width.
  • the strip is passed between the rolls along a path which is substantially symmetrical with respect to the centre-­line of the work rolls.
  • a strip 5 of a length l is to be rolled, where l is considerably less than L, then the strip can be passed between the rolls along a number of different paths which are offset from the centre-line of the rolls.
  • the first strip A is rolled along a path where the strip is off-set from the centre-line of the mill by a maximum distance towards the left-hand side of the mill.
  • the second strip B is displaced by the side guides by a small amount so that its centre is slightly closer to the centre-line of the mill and it is rolled along this path.
  • Successive strips are displaced relative to the path taken by the preceding strip until the path taken by strip N is displaced from the mill centre-line by a maximum amount towards the right-hand side of the mill.
  • substantially the entire length of the rolls has been used to roll the strips A - N.
  • the path taken by each one is displaced slightly relative to that of the preceding strip such that strip Z is displaced to the same position as strip A relative to the work rolls. This is repeated as necessary until all the strips have been rolled.
  • successive strips can be displaced relative to each other or successive groups of strips, where a group consists of two or three strips, can be displaced relative to the path taken by the preceding group of strips.
  • the work rolls can be shifted axially by a small amount, say 10 mm, between the successive strips or groups of strips.
  • a small amount say 10 mm
  • the rolling mill may be a conventional four-­high mill or a six-high mill or it could be what is known as a "Pair Crossed Mill".
  • the invention can also be used in conjunction with a mill which includes one or more hydraulically expandable backing rolls known as "VC Rolls”.
  • the actuating mechanism for moving the rolls may be mounted either on the drive side or on the operator's side of the mill. Separate actuating devices may be used for each work roll or, if the work roll chocks at one end of the rolls are attached to one another, it may be possible to use only one actuating mechanism to one of the rolls and the other roll will be moved by virtue of its attachment at the roll chock.
  • a workpiece 5 is shown being rolled between the rolls 1, 3 and it is passed along a path in which its left-hand edge is spaced from the left-hand end of the rolls 1, 3 by a distance a . If, during rolling, the strip moves sideways so that the actual position of the left-hand edge of the strip is spaced by a distance b from the left-hand end of the work rolls then, by differentially adjusting the gap between the rolls 1, 3 along the length of the rolls, the workpiece can be forced back to its required position. To this end, the position of the strip at one or more stands of the mill is detected by means of a non-contact device, such as a laser or photocell, or by means of a contact device, such as a roller, carrying a position transducer. If the strip begins to move away from the chosen path, an error signal will be developed.
  • a non-contact device such as a laser or photocell
  • a contact device such as a roller
  • the error signal is representative of the distance (b - a).
  • the signal is employed to differentially vary the roll gap along its length. It is known that a tapered roll gap, as shown in Figure 3, causes the strip to move sideways in the mill towards the side which applies the smaller reduction in strip thickness, i.e. towards the side having the larger roll gap. Thus, by differentially adjusting the roll gap the strip is steered back on to the required path.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
EP86309421A 1985-12-04 1986-12-03 Laminage de bandes Withdrawn EP0226391A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB858529919A GB8529919D0 (en) 1985-12-04 1985-12-04 Rolling of metal strip
GB8529919 1985-12-04
GB8531651 1985-12-23
GB858531651A GB8531651D0 (en) 1985-12-23 1985-12-23 Rolling metal strips

Publications (1)

Publication Number Publication Date
EP0226391A1 true EP0226391A1 (fr) 1987-06-24

Family

ID=26290071

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86309421A Withdrawn EP0226391A1 (fr) 1985-12-04 1986-12-03 Laminage de bandes

Country Status (1)

Country Link
EP (1) EP0226391A1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2504415A1 (fr) * 1981-04-24 1982-10-29 Betr Forsch Inst Angew Forsch Dispositif de commande de la position de defilement de la bande lors du laminage

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2504415A1 (fr) * 1981-04-24 1982-10-29 Betr Forsch Inst Angew Forsch Dispositif de commande de la position de defilement de la bande lors du laminage

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENTS ABSTRACTS OF JAPAN, vol. 8, no. 258 (M-340)[1695], 27th November 1984; & JP-A-59 130 604 (HITACHI) 27.07.1984 *
PATENTS ABSTRACTS OF JAPAN, vol. 9, no. 57 (M-363)[1780], 13th March 1985; & JP-A-59 193 704 (KAWASAKI) 02.11.1984; & EP-A-0 179 172 (KAWASAKI) 30.04.86 *

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Designated state(s): BE FR GB IT NL

17P Request for examination filed

Effective date: 19871207

17Q First examination report despatched

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STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19910104

RIN1 Information on inventor provided before grant (corrected)

Inventor name: LAWSON, KENNETH THOMAS