EP3898020B1 - Dispositif de refroidissement pour laminoir à chaud - Google Patents

Dispositif de refroidissement pour laminoir à chaud Download PDF

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Publication number
EP3898020B1
EP3898020B1 EP19817599.4A EP19817599A EP3898020B1 EP 3898020 B1 EP3898020 B1 EP 3898020B1 EP 19817599 A EP19817599 A EP 19817599A EP 3898020 B1 EP3898020 B1 EP 3898020B1
Authority
EP
European Patent Office
Prior art keywords
pressure means
hot
rolling mill
cooling device
work roll
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.)
Active
Application number
EP19817599.4A
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German (de)
English (en)
Other versions
EP3898020A1 (fr
Inventor
George SCHIPPER
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.)
Tata Steel Ijmuiden BV
Original Assignee
Tata Steel Ijmuiden BV
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Publication date
Application filed by Tata Steel Ijmuiden BV filed Critical Tata Steel Ijmuiden BV
Publication of EP3898020A1 publication Critical patent/EP3898020A1/fr
Application granted granted Critical
Publication of EP3898020B1 publication Critical patent/EP3898020B1/fr
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Classifications

    • 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
    • B21B27/06—Lubricating, cooling or heating rolls
    • B21B27/10—Lubricating, cooling or heating rolls externally
    • 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
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B21B37/76—Cooling control on the run-out table
    • 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
    • B21B27/06—Lubricating, cooling or heating rolls
    • B21B27/10—Lubricating, cooling or heating rolls externally
    • B21B2027/103—Lubricating, cooling or heating rolls externally cooling externally

Definitions

  • the invention relates to a cooling device for a hot-rolling mill for a metal strip, the hot-rolling mill having at least one pair of work rolls each having a work roll surface, the cooling device comprising a shovel-shaped body comprising a plurality of openings arranged to project a cooling fluid on a work roll, and a scraper arranged to prevent the cooling fluid from spilling on the metal strip, when in use, and a pressure means for pressing the scraper against said work roll surface. It also relates to a hot-rolling mill comprising such a cooling device.
  • Such a cooling device for a hot-rolling mill is known from patent EP 2164 651 B1 .
  • This known cooling device is equipped with cooling jets and scraper jets.
  • the cooling jets are arranged perpendicularly to the surface of the work roll.
  • the scraper jets are oriented in the desired flow direction following a re-entrant angle towards the perpendicular to the surface of the work roll.
  • the cooling fluid used could be water or a water and oil emulsion, with or without surfactants.
  • Another cooling device for a hot-rolling mill is known from EP 2114 584 B1 .
  • This cooling device uses transverse plates, acting as scrapers, arranged longitudinally relative to the work roll and are located at a distance from the roll such that the plates ensure that the cooling liquid flow is controlled and forms a highly turbulent water cushion.
  • a cooling device is known from DE 10 2009 053073 A1 which comprises an arcuate cooling shell that comprises a plurality of hinged-together cooling shell elements.
  • This cooling device has at least two segments connected to each other in a moveable manner and being provided with spacers.
  • the current invention relates to a cooling device for a hot-rolling mill with improved service life, having less wear, leading to less down-time. It also relates to a more predictable wear.
  • the shovel-shaped body is further comprising one or more spacers arranged to contact the work roll surface.
  • This has the advantage that also a predefined distance between the shovel-shaped body and the work roll surface is created, leading to a predefined cushion of cooling fluid and a stable position of the shovel-shaped body.
  • the one or more spacers are arranged to contact the work roll surface with a predefined force, there is also an even, and controlled, wear of the one or more spacers.
  • the force can be set in advance, set to a minimum value needed for a stable process and a stable cooling fluid cushion size resulting in less wear.
  • the one or more spacers are arranged to contact a part of the work roll surface in the vicinity of a back-up roll, when in use.
  • a hot-rolling mill usually is equipped with work rolls and back-up rolls contacting the work rolls. This configuration is well known to a person skilled in the art and therefore requires no further elucidation.
  • the one or more spacers are positioned such that room is provided for the cooling fluid to escape from the area between the work roll surface and the shovel-shaped body, in the direction of the back-up roll.
  • the one or more spacers are preferably located at the other, or opposite end of said curved portion, in the vicinity of the back-up roll, when in use. In that way a more balanced force on the work roll surface could be generated, since the at least two points of contact so created give the option of balancing out the forces over these points of contact. It may therefore be preferable that the scraper is arranged to contact a part of the work roll surface in the vicinity of the metal strip, when in use.
  • the one or more spacers are positioned at the extremities of the shovel-shaped body. This has the benefit of having even more stability since positioning of the one or more spacers at the extremities of the shovel-shaped body allows a better alignment of the one or more spacers on the work roll surface and therefore also the scraper is aligned better on the work roll surface. As explained earlier, uneven wear is something that needs to be prevented. As the scraper is arranged over the entire length at one end of the curve shaped portion of the shovel-shaped body, it is preferable that the wear is also even, as uneven wear makes the cooling fluid spill to the metal strip. The configuration with the pressure means and the additional pressure makes it possible to control the force the scraper exercises over the entire length of the scraper leading to an even and minimal wear of the scraper.
  • the scraper is a mechanical scraper made of a rigid material.
  • Mechanical scrapers have the benefit of being relatively cheap and still provide an elegant way of preventing the cooling fluid from spilling on the metal strip. Other than that, they are relatively easy to replace, giving less disturbance in the production environment.
  • Preferred is a scraper made of a rigid material to prevent wear, but also other materials could be used depending on the specific requirements. Also other types of scrapers could be used.
  • the cooling device further comprises at least one additional pressure means arranged to cooperate with the pressure means to press both the scraper and the one or more spacers against the work roll surface with a predefined force.
  • the at least one additional pressure means give the shovel-shaped body an extra controlled movement option since the at least one additional pressure means cooperate with the pressure means.
  • the pressure means are arranged to move the shovel-shaped body in a to-and-fro movement with respect to the work roll surface. It is also arranged to tilt the shovel-shaped body such that the room provided between the shovel shaped body in the vicinity of the metal strip can be set to a desired value defining the room provided in the vicinity of the back-up roll.
  • the at least one additional pressure means can be set independently, leading to an independent and predefined room for the part of the work roll surface in the vicinity of the metal strip when in use and an independent and predefined room for the part of the work roll surface in the vicinity of the back-up roll when in use.
  • both pressure means and additional pressure means therefore define the room available to form a water cushion between the shovel-shaped body and the work roll which provides the cooling of the work roll. In this way the water cushion formed is more stable. So, by using both pressure means and an at least one additional pressure means, both the scraper and the one or more spacers can be set such that they are individually controlled. No unnecessary gaps are formed leading to loss of water of the water cushion, which in turn leads to an unstable water cushion and therefore unstable cooling. Using both pressure means and additional pressure means allow the force of the scraper and the one or more spacers on the work roll surface to be set to a predefined value and create a balanced cooling device having less wear.
  • the pressure means and the at least one additional pressure means are arranged to cooperate such that both the predefined force of the scraper and the predefined force of the one or more spacers on the work roll surface are as low as possible.
  • the predefined force can be set to any desired value
  • the predefined force on the work roll surface of the scraper can be set equal to, higher or lower than the predefined force of the one or more spacers on the work roll surface.
  • the pressure means and / or the at least one additional pressure means are air pressure means and / or a hydraulic pressure means.
  • the pressure means and the at least one additional pressure means can be embodied in several ways. The inventor has found it beneficial to use air pressure means and hydraulic pressure means.
  • the pressure means are air pressure means and the at least one additional pressure means are hydraulic pressure means. Naturally other configurations and pressure means are possible.
  • the pressure means and the at least one additional pressing means are controlled automatically by a hot-rolling mill control system.
  • the hot-rolling mill is controlled by a hot-rolling mill control system and therefore the control can be totally integrated in the control system making it possible for the operation to be controlled automatically.
  • the pressure means and the at least one additional pressing means are controlled such that in idle time the predefined force on the scraper and the predefined force on the one or more spacers are minimised in order to prevent wear.
  • the predefined forces are set to the normal processing values. Therefore it is beneficial to set them to the minimum value which further reduces the wear on the scraper and the one or more spacers.
  • the pressure means and the at least one additional pressure means are placed in an angle relative to each other of 70 - 120 degrees.
  • the pressure means and the additional pressure means should not be lined up in the same plane, but be placed with an angle relative to each other. The inventor found it beneficial that the preferred angle is between 70 and 120 degrees.
  • Figure 1 shows the cooling device 1 of the invention as part of a hot-rolling mill for a metal strip 10.
  • the hot-rolling mill is designed to process a metal strip 10 and has at least one pair of work rolls 2 and as such is known to a person skilled in the art and therefore requires no further elucidation.
  • the hot-rolling mill is equipped with the same configuration on the other side of the metal strip 10. This is not shown for clarity purposes.
  • the configuration further comprises a back-up roll 13.
  • the work roll 2 has a work roll surface 2'.
  • the cooling device 1 further comprises a shovel-shaped body 3 which in itself comprises a plurality of openings 4 (better shown in figure 2 ). It further comprises a scraper 5 arranged to prevent the cooling fluid from spilling on the metal strip 10.
  • the scraper 5 is therefore arranged to contact a part of the work roll surface in the vicinity of the metal strip 6, when in use.
  • the cooling device 1 is also equipped with one or more spacers 8, arranged to contact a part of the work roll surface in the vicinity of the back-up roll 7, when in use.
  • the pressure means 9 and an additional pressure means 11. are arranged to cooperate with each other to press both the scraper 5 and the one or more spacers 8 against the work roll surface 2' with a predefined force.
  • the pressure means 9 are arranged to move to-and-fro the work roll surface 2' indicated by arrow A.
  • FIG. 3 shows the important parts in more detail. Although in figure 3 the work roll 2 is shown as being elliptical, it is clear that this is only because a part of the work roll 2 is shown.
  • the at least one additional pressure means 11 allow that a predefined room for the scraper 5 can be set which does not define the room for the one or more spacers 8 and vice versa.
  • the at least one additional pressure means 11 can be set independently, leading to an independent and predefined room for the part of the work roll surface in the vicinity of the metal strip 6, when in use, and room for the part of the work roll surface in the vicinity of the back-up roll 7, when in use. So, by using both pressure means 9 and an at least one additional pressure means 11, both ends can be set such that they are individually controlled. This allows the contact at both ends to be set to a predefined force and create a balanced cooling device 1 having less wear.
  • the pressure means 9 and / or the additional pressure means 11 could be air pressure means and / or hydraulic pressure means.
  • FIG. 2 shows the shovel-shaped body 3 as an individual part of the cooling device 1.
  • the shovel-shaped body 3 in itself comprises a plurality of openings 4 arranged to project a cooling fluid on a work roll 2.
  • the scraper 5 is shown, which is positioned at one end of the curved portion of the shovel-shaped body 3.
  • the one or more spacers 8 are positioned at the other, or opposite end of the curved portion of the shovel-shaped body 3. In this configuration it is shown that the spacers 8 are placed at the extremities of the shovel-shaped body 3.
  • the one or more spacers 8 are arranged to contact the work roll surface 2' with a predefined force.
  • the scraper 5 could be a mechanical scraper, preferably made of a rigid material.
  • the angle between the pressure means 9 and the at least one additional pressure means 11 could be set at 70 - 120 degrees relative to each other.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)

Claims (10)

  1. Dispositif de refroidissement (1) pour un laminoir à chaud pour une bande métallique (10), le laminoir à chaud comportant au moins une paire de cylindres de travail (2) comportant chacun une surface (2') de cylindre de travail, le dispositif de refroidissement comprenant un corps en forme de pelle (3) comprenant une pluralité d'ouvertures (4) agencées pour projeter un fluide de refroidissement sur un cylindre de travail (2), et un racloir (5) raccordé au corps en forme de pelle (3) agencé pour empêcher le fluide de refroidissement de se répandre sur la bande métallique (10), et un moyen de pression (9) destiné à presser le racloir (5) contre ladite surface (2') de cylindre de travail, le corps en forme de pelle (3) comprenant en outre une ou plusieurs entretoises (8) agencées pour entrer en contact avec la surface (2') de cylindre de travail.
  2. Dispositif de refroidissement (1) pour un laminoir à chaud selon la revendication 1, caractérisé en ce que la ou les entretoises (8) sont agencées pour venir en contact avec une partie de la surface de cylindre de travail à proximité d'un cylindre d'appui (7) lorsqu'il est en fonctionnement.
  3. Dispositif de refroidissement (1) pour un laminoir à chaud selon la revendication 1 ou 2, caractérisé en ce que le racloir (5) est agencé pour entrer en contact avec une partie de la surface de cylindre de travail à proximité de la bande métallique (6) lorsqu'il est en fonctionnement.
  4. Dispositif de refroidissement (1) pour un laminoir à chaud selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la ou les entretoises (8) sont positionnées au niveau des extrémités du corps en forme de pelle (3).
  5. Dispositif de refroidissement (1) pour un laminoir à chaud selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le racloir (5) est un racloir mécanique constitué d'un matériau rigide.
  6. Dispositif de refroidissement (1) pour un laminoir à chaud selon l'une quelconque des revendications 1 à 5, caractérisé en ce que le dispositif de refroidissement (1) comprend en outre au moins un moyen de pression supplémentaire (11) agencé pour coopérer avec le moyen de pression (9) pour presser à la fois le racloir (5) et la ou les entretoises (8) contre la surface de cylindre de travail (2') avec une force prédéfinie.
  7. Dispositif de refroidissement (1) pour un laminoir à chaud selon les revendications 6, caractérisé en ce que le moyen de pression (9) et/ou le au moins un moyen de pression supplémentaire (11) sont un moyen de pression pneumatique et/ou un moyen de pression hydraulique.
  8. Dispositif de refroidissement (1) pour un laminoir à chaud selon l'une quelconque des revendications 6 à 7, caractérisé en ce que le moyen de pression (9) et le au moins un moyen de pression supplémentaire (11) sont placés selon un angle l'un par rapport à l'autre de 70-120 degrés.
  9. Laminoir à chaud comprenant un dispositif de refroidissement (1) selon l'une quelconque des revendications 1 à 8.
  10. Laminoir à chaud selon la revendication 9, comprenant un système de commande de laminoir à chaud et un dispositif de refroidissement (1) selon l'une quelconque des revendications 6 à 8, caractérisé en ce que le moyen de pression (9) et le au moins un moyen de pression supplémentaire (11) sont commandés automatiquement par ledit système de commande de laminoir à chaud.
EP19817599.4A 2018-12-19 2019-11-25 Dispositif de refroidissement pour laminoir à chaud Active EP3898020B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP18214145 2018-12-19
PCT/EP2019/082443 WO2020126333A1 (fr) 2018-12-19 2019-11-25 Dispositif de refroidissement destiné à un laminoir à chaud

Publications (2)

Publication Number Publication Date
EP3898020A1 EP3898020A1 (fr) 2021-10-27
EP3898020B1 true EP3898020B1 (fr) 2024-01-17

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ID=64746224

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19817599.4A Active EP3898020B1 (fr) 2018-12-19 2019-11-25 Dispositif de refroidissement pour laminoir à chaud

Country Status (5)

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EP (1) EP3898020B1 (fr)
KR (1) KR20210104710A (fr)
ES (1) ES2970134T3 (fr)
FI (1) FI3898020T3 (fr)
WO (1) WO2020126333A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111889518A (zh) * 2020-08-06 2020-11-06 建龙北满特殊钢有限责任公司 一种节水型轧辊孔型表面冷却装置、制造方法及轧钢机组

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100254076B1 (ko) * 1992-10-02 2000-04-15 가나이 쓰도무 작업롤 교차식 압연기 및 압연 설비 및 압연 방법
BE1017462A3 (fr) 2007-02-09 2008-10-07 Ct Rech Metallurgiques Asbl Dispositif et procede de refroidissement de cylindres de laminage en regime hautement turbulent.
EP2014379A1 (fr) 2007-06-04 2009-01-14 ArcelorMittal France Laminoir avec dispositif de refroidissement et procédé de laminage
DE102009053074A1 (de) 2009-03-03 2010-09-09 Sms Siemag Ag Verfahren und Kühlvorrichtung zum Kühlen der Walzen eines Walzgerüstes
DE102016223131A1 (de) * 2016-09-06 2018-03-08 Sms Group Gmbh Vorrichtung und Verfahren zum Aufbringen eines flüssigen Mediums auf eine Walze und/oder auf ein Walzgut und/oder zum Entfernen des flüssigen Mediums

Also Published As

Publication number Publication date
KR20210104710A (ko) 2021-08-25
ES2970134T3 (es) 2024-05-27
EP3898020A1 (fr) 2021-10-27
WO2020126333A1 (fr) 2020-06-25
FI3898020T3 (fi) 2024-01-31

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