EP0888832A2 - Verfahren zum Walzen von Metallband und Walzwerk zur Durchführung des Verfahrens - Google Patents

Verfahren zum Walzen von Metallband und Walzwerk zur Durchführung des Verfahrens Download PDF

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Publication number
EP0888832A2
EP0888832A2 EP98201796A EP98201796A EP0888832A2 EP 0888832 A2 EP0888832 A2 EP 0888832A2 EP 98201796 A EP98201796 A EP 98201796A EP 98201796 A EP98201796 A EP 98201796A EP 0888832 A2 EP0888832 A2 EP 0888832A2
Authority
EP
European Patent Office
Prior art keywords
roller
strip
rolling mill
rolling
path
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Withdrawn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
EP98201796A
Other languages
English (en)
French (fr)
Other versions
EP0888832A3 (de
Inventor
Filippo Cattaneo
Ettore Cernuschi
Antonino Rossi
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.)
SMS Group SpA
Original Assignee
Demag Italimpianti 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 Demag Italimpianti SpA filed Critical Demag Italimpianti SpA
Publication of EP0888832A2 publication Critical patent/EP0888832A2/de
Publication of EP0888832A3 publication Critical patent/EP0888832A3/de
Withdrawn legal-status Critical Current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
    • B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B39/02—Feeding or supporting work; Braking or tensioning arrangements, e.g. threading arrangements
    • B21B39/08—Braking or tensioning arrangements
    • 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

Definitions

  • the present invention relates to a method of rolling a metal strip extending along a path between two housings of a rolling mill.
  • Strips are rolled, with progressive reduction of the width of the strip, by the passage of the strip through rolling housings arranged in sequence and operating on the strip simultaneously.
  • the longitudinal speed of the strip increases progressively from the input housing to the output housing and, consequently, in order to prevent excessive accumulations or pull between one housing and another, the speed of the main motors which drive the rolls of the housings is regulated by control of the pull between housings.
  • pulling devices In order to exert a pull, albeit limited, between the housings, pulling devices, commonly known as loopers, are normally interposed between the housings, such a device comprising a roller which is not driven, acting on the strip in order to keep the loops formed between the housings within a predetermined range when the downstream housing does not take in the strip sufficiently or when the speed of the downstream housing is excessive.
  • the pulling device also performs the function of regulating the pull by means of a suitable control of the load.
  • the pulling device normally acts underneath the strip being rolled and performs a mainly vertical action on the strip which is increased by its movement upwards.
  • the looper roller may be mounted on a vertically movable element or may be mounted on a frame pivoting about a fixed axis.
  • the position of the roller may be adjusted by electromechanical or hydraulic control devices. Determination of the position of the roller and the force it exerts on the strip enables a correct strategy to be implemented in the regulation of the motors of the housings.
  • the invention is based on the observation that a predominantly resilient lengthening of the fibres of the strip brings about a variation in the local force separating the rolls.
  • the present invention Provides a method of the type specified which is characterized in that it comprises the step of imposing on the strip a lengthening of the path which differs across the width of the strip in order to achieve differentiated lengthening of the strip across its width.
  • a rolling mill is generally indicated 1, the drawings being limited to a portion thereof disposed between two successive rolling housings 2 and 3, that is, more precisely, an upstream housing 2 with rolls 2a and a downstream housing 3 with rolls 3a.
  • a path 4 for a metal strip 5 which is being rolled extends between the housings 2 and 3 in the direction of the arrow F.
  • a central longitudinal band 6, opposed longitudinal edge bands 7, and a lower face 8 are identified within the strip.
  • the strip 5 is acted on by a first roller 9 and a second roller 10 of respective pulling devices, or so-called loopers, indicated 11 and 12, respectively.
  • the rollers 9 and 10 act on the same face of the strip 5, in the embodiment shown, on its lower face 8.
  • the rollers 9 and 10 are disposed side by side, the first roller being disposed on the same side as the downstream housing 3 and the second roller being disposed on the same side as the upstream housing 2.
  • the first roller 9 is shaped. It is preferably convex in the centre; in other words, it has a barrel-shaped profile. It freely rotatable on an element 13 of the pulling device 11, this element 13 being movable vertically and being acted on by pressure means 14 which urge the first roller 9 against the strip with a predetermined force.
  • the second roller 10 has a profile different from the profile of the first roller 9 and, in particular, is a uniform cylinder. It is supported for rotating idly on an element 15 of the pulling device 12, the element 15 being movable vertically and being acted on by pressure means 16 which urge the second roller 10 against the strip 5 with a predetermined force.
  • rollers may be mounted on a pivoting frame instead of on the vertically movable element.
  • the second roller indicated 17 in Figures 5 and 6, has a profile which is concave in the centre.
  • the first roller 9 is mounted on the element 11 so as to be movable axially under the action of a piston and cylinder unit 18; the second roller 10 in general, and the second roller 17 in particular, is mounted on the element 13 so as to be movable axially under the action of a piston and roller unit 19.
  • the rollers 9, 10 and 17 may be capable of being inclined in a vertical plane by the respective pressure means 14 and 16 instead of being movable axially.
  • the first roller imposes on the central longitudinal band 6 a movement away from the path 4 to a new path 4' which is longer than the path 4, and hence causes a substantially resilient lengthening of the path relative to the path which the edge bands 7 follow.
  • the imposition of differentiated lengthening on different longitudinal bands results in differentiated relief of the separation force from one band to another.
  • a suitable relative position of the roller 9 and of the roller 10 in the vertical direction enables the width of the central band 6 to be varied.
  • a suitable axial displacement of the roller 9 enables the position, of the band 6 within the width of the strip also to be varied slightly.
  • a suitable relative position of the roller 9 and of the roller 17 in the vertical direction enables the greater lengthening of the central band 6 in comparison with the edge bands 7 to be attenuated continuously until the situation is reversed and a greater lengthening of the edge bands 7 in comparison with the central band 6 is brought about.
  • a suitable axial displacement of the roller 17 enables the ratio between the widths of the edge bands to be varied slightly.
  • a method of rolling a metal strip 5 extending along a path 4 between two housings 2 and 3 of a rolling mill 1 comprises the step of imposing on the strip 5 a lengthening of its path 4 which differs across the width of the strip in order to achieve differentiated lengthening of the strip across its width.
  • the lengthening of the path 4 is preferably imposed on a substantially central longitudinal band 6 of the strip in order to bring about a lengthening of the strip in the region of this band.
  • the main advantage of the rolling method and of the rolling mill for implementing the method lies in their simplicity and effectiveness.
  • a further advantage of the invention lies in the ease with which the method and the rolling mill can be adapted to specific circumstances which arise gradually such as, for example, progressive wear of the rolls and variation in the thermal expansion of the rolls both during the course of the rolling operation and from the head end to the tail end of an individual rolled strip.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
EP98201796A 1997-07-02 1998-05-29 Verfahren zum Walzen von Metallband und Walzwerk zur Durchführung des Verfahrens Withdrawn EP0888832A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI971569 1997-07-02
IT97MI001569A IT1292458B1 (it) 1997-07-02 1997-07-02 Metodo di laminazione di un nastro metallico e laminatoio per l'attuazione del metodo

Publications (2)

Publication Number Publication Date
EP0888832A2 true EP0888832A2 (de) 1999-01-07
EP0888832A3 EP0888832A3 (de) 2000-03-22

Family

ID=11377485

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98201796A Withdrawn EP0888832A3 (de) 1997-07-02 1998-05-29 Verfahren zum Walzen von Metallband und Walzwerk zur Durchführung des Verfahrens

Country Status (2)

Country Link
EP (1) EP0888832A3 (de)
IT (1) IT1292458B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110756592A (zh) * 2019-09-29 2020-02-07 武汉钢铁有限公司 控制热轧带钢尾部宽度的方法及装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3782152A (en) * 1971-04-22 1974-01-01 Centro Speriment Metallurg Apparatus for improving the flatness of rolled strips
GB1496946A (en) * 1974-08-06 1978-01-05 Nippon Kokan Kk Method for controlling flatness of metal sheet in rolling
JPS61229405A (ja) * 1985-04-03 1986-10-13 Nippon Steel Corp 圧延材板形状の調整方法および装置
JPS6293016A (ja) * 1985-10-18 1987-04-28 Nippon Steel Corp 圧延材板形状の調整装置
JPH03221204A (ja) * 1990-01-29 1991-09-30 Nkk Corp 熱間圧延板材の形状制御方法
DE19503363A1 (de) * 1994-02-15 1995-09-07 Siemens Ag Einrichtung und Verfahren zum Regeln der Planheit und/oder Spannungsverteilung von gewalzten Metallbändern

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3782152A (en) * 1971-04-22 1974-01-01 Centro Speriment Metallurg Apparatus for improving the flatness of rolled strips
GB1496946A (en) * 1974-08-06 1978-01-05 Nippon Kokan Kk Method for controlling flatness of metal sheet in rolling
JPS61229405A (ja) * 1985-04-03 1986-10-13 Nippon Steel Corp 圧延材板形状の調整方法および装置
JPS6293016A (ja) * 1985-10-18 1987-04-28 Nippon Steel Corp 圧延材板形状の調整装置
JPH03221204A (ja) * 1990-01-29 1991-09-30 Nkk Corp 熱間圧延板材の形状制御方法
DE19503363A1 (de) * 1994-02-15 1995-09-07 Siemens Ag Einrichtung und Verfahren zum Regeln der Planheit und/oder Spannungsverteilung von gewalzten Metallbändern

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 011, no. 074 (M-568), 6 March 1987 (1987-03-06) -& JP 61 229405 A (NIPPON STEEL CORP), 13 October 1986 (1986-10-13) *
PATENT ABSTRACTS OF JAPAN vol. 011, no. 301 (M-628), 30 September 1987 (1987-09-30) -& JP 62 093016 A (NIPPON STEEL CORP), 28 April 1987 (1987-04-28) *
PATENT ABSTRACTS OF JAPAN vol. 015, no. 501 (M-1193), 18 December 1991 (1991-12-18) -& JP 03 221204 A (NKK CORP), 30 September 1991 (1991-09-30) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110756592A (zh) * 2019-09-29 2020-02-07 武汉钢铁有限公司 控制热轧带钢尾部宽度的方法及装置
CN110756592B (zh) * 2019-09-29 2021-06-01 武汉钢铁有限公司 控制热轧带钢尾部宽度的方法及装置

Also Published As

Publication number Publication date
ITMI971569A0 (de) 1997-07-02
ITMI971569A1 (it) 1999-01-02
EP0888832A3 (de) 2000-03-22
IT1292458B1 (it) 1999-02-08

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