EP1365870B1 - Method for removing scale from strips - Google Patents

Method for removing scale from strips Download PDF

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Publication number
EP1365870B1
EP1365870B1 EP02700270A EP02700270A EP1365870B1 EP 1365870 B1 EP1365870 B1 EP 1365870B1 EP 02700270 A EP02700270 A EP 02700270A EP 02700270 A EP02700270 A EP 02700270A EP 1365870 B1 EP1365870 B1 EP 1365870B1
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EP
European Patent Office
Prior art keywords
strip
water
finishing train
pressure
scale
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
EP02700270A
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German (de)
French (fr)
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EP1365870A1 (en
Inventor
Jürgen Seidel
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SMS Siemag AG
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SMS Demag AG
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Publication of EP1365870A1 publication Critical patent/EP1365870A1/en
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
    • B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
    • 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
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates

Definitions

  • the invention relates to a method for descaling strips in a rolling mill with a scale washer and one in the direction of the belt behind the tinder washer arranged finishing line, where the belt in the tinder washer as well as within the rolling mill on the top and bottom with Water is pressurized, with a symmetrical temperature distribution generated on the top and bottom of the belt in the scale washer and in same way is maintained within the finishing train.
  • Tinder is an oxide layer which among other things when rolling steel on the strip.
  • the scale growth depends essentially on the surface temperature of the strip, the scaling time, the environmental conditions and the material of the tape. A higher surface temperature, longer scaling time and softer Steels lead to stronger scale growth.
  • EP 0 920 929 A2 proposes, in the running direction of the belt in front of the to provide first, second and third stands of the finishing mill surface cooler, the rows of nozzles arranged opposite each other on both sides of the belt exhibit.
  • a controller determines the total amount of water by every row of nozzles is sprayed onto the belt.
  • the scale washer arranged in front of the finishing train consists of two on both Rows of nozzles arranged opposite each other on the belt.
  • the belt is subjected to high descaling pressure (about 200 bar) water. Due to the double-sided application thermal energy is extracted from the belt with water. As a result of different Conditions on the top and bottom result in uneven temperatures. Because of the laws of scale growth described at the beginning scale growth begins immediately behind the nozzle bar again, due to the different temperatures on the edge surfaces the secondary scale grows back at different speeds. Also forms a different hardness of scale due to the unequal temperatures.
  • the invention is therefore based on the object of proposing a method, that the adverse effects of different temperatures as well as different Scale growth between the top and bottom of the belt reduced within the finishing train.
  • the solution to this task is based on the idea of the necessary measures to avoid uneven temperatures and scale growth already in the area of the scale washer to seize by the tape in the scale washer on several arranged one behind the other in the running direction Places with water under descaling pressure, the in Direction of travel last position on the underside at a distance from the last position located at the top and closer to the finishing train.
  • Water is applied at the various points on the belt for example by means of rows of nozzles known per se.
  • the distance to choose the last row of nozzles at the bottom from the last row of nozzles at the top depends on the difference in cooling effect on the top and bottom and the scale growth of the rolled material in the respective rolling mill from.
  • the underside in one embodiment of the invention as a whole a larger amount of water under descaling pressure than the top of the Band are applied.
  • a smaller distance between the last two Row of nozzles may be necessary due to design constraints on the rolling mill his.
  • the application takes place with Water at a lower pressure in the direction of travel of the belt using rows of nozzles before and / or after the last position on the underside of the tape, at the this is pressurized with water under descaling pressure.
  • the amount of water required for a symmetrical temperature distribution depends on the feed speed before the finishing train, the wear of the Descaling nozzles in the nozzle rows, from the pressure level and the Width of the tape.
  • the amount of descaling pressure and low pressure on the tape applied water preferably adjustable.
  • the symmetrical temperature distribution monitored on the top and bottom of the belt by non-contact, especially behind the scale washer in the direction of the belt arranged pyrometers, the temperatures on the top and bottom of the tape can be measured.
  • the amount of water under lower pressure can then be as The manipulated variable of a control loop can be changed so that on the upper and Same temperatures are always measured on the underside.
  • the rolling torques can be used as a control variable for the temperatures at least one scaffold of the finishing train above and below the belt be measured.
  • the tape at least between the first two scaffolds of the finishing train with water is, the bottom with a larger amount of water than the top of the band is applied. Even the arrangement the upper and lower bars can be offset from each other by the distance y respectively.
  • the measures taken within the finishing train can also be used with the help of a control loop can be monitored with the measured temperatures the top and bottom of the belt as a controlled variable and the amount of water supplied as stele size.
  • FIG. 1 shows a finishing train 1 with one arranged upstream in the direction of travel 2 Tinder washer 3 in a hot strip mill. That is the hot strip mill continuous belt 4 is in the scale washer 3 on the top 5 and the bottom 6 of a total of four nozzle rows 7, 8 with water below Descaling pressure of about 200 bar. The at the bottom 6 in Direction 2 of the last row of nozzles 8 is closer to the finishing train 1 than the last row of nozzles 7 in the running direction at the top 5 by a symmetrical Temperature distribution on the top and bottom 5, 6 of the band 4 too achieve.
  • the distance 11 between the last row of nozzles 7 at the top and the The last row of nozzles 8 on the underside of the belt must always be determined that the cooling effect of the on the top 5 of the band the bottom 6 corresponds.
  • the distance 11 can, however, for design reasons, for example the space requirement of the scale washer, the arrangement of rollers or pipes may be limited. For this reason, the cooling of the Bottom 6 of the band supported by the nozzle rows 9 with low pressure.
  • an excessively large distance 11 would be disadvantageous because the longer Path from the last row of nozzles 7 at the top 5 to the inlet in the finishing line 1 again a thicker layer of scale on the top can train.
  • FIG. 2 shows a schematic side view of a scale washer 3, however without rows of nozzles 9 for low pressure water.
  • water collecting channels 17th are arranged, which additionally reduce the cooling effect on the belt top 5 and can be used to a limited extent as an actuator.
  • Figure 3 finally shows a scale washer 3, in which an application the tape 4 with water under lower pressure with a row of nozzles 9 before and two rows of nozzles 9 behind the last row of nozzles 7 on the underside of the Belt takes place on which this is pressurized with water under descaling pressure becomes.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Cigarettes, Filters, And Manufacturing Of Filters (AREA)
  • Manufacturing Of Electric Cables (AREA)
  • Organic Insulating Materials (AREA)
  • Cleaning By Liquid Or Steam (AREA)

Abstract

Strip is descaled in a rolling line having a scale scrubber and a finishing line downstream of the scale scrubber. The strip is sprayed with water on its upper and under sides at a descaling pressure in the scale scrubber. In the scrubber the strip is treated with water at a multiplicity of locations spaced from one another in the travel direction. A furthest downstream location at the under side is spaced downstream from a furthest downstream location at the upper side. Rolling torques of at least one rolling mill of the finishing line are measured above and below the strip and control parameters are produced corresponding thereto. These parameters are fed to a control circuit and used thereby to adjust quantities of water sprayed at the locations against the upper side and under side of the strip upstream of the finishing line.

Description

Die Erfindung betrifft ein Verfahren zum Entzundern von Bändern in einer Walzstraße mit einem Zunderwäscher sowie einer in Laufrichtung des Bandes hinter dem Zunderwäscher angeordneten Fertigstraße, bei dem das Band in dem Zunderwäscher sowie innerhalb der Walzstraße auf der Ober- und Unterseite mit Wasser unter Druck beaufschlagt wird, wobei eine symmetrische Temperaturverteilung an der Ober- und Unterseite des Bandes im Zunderwäscher erzeugt und in gleicher Weise Innerhalb der Fertigstrasse aufrechtgehalten wird.The invention relates to a method for descaling strips in a rolling mill with a scale washer and one in the direction of the belt behind the tinder washer arranged finishing line, where the belt in the tinder washer as well as within the rolling mill on the top and bottom with Water is pressurized, with a symmetrical temperature distribution generated on the top and bottom of the belt in the scale washer and in same way is maintained within the finishing train.

Beim Betrieb von Warmbandwalzstraßen werden Sekundärzundereinwalzungen an der Bandoberfläche beobachtet. Als Zunder bezeichnet man eine Oxydschicht, die sich u.a. beim Walzen von Stahl auf dem Band bildet. Das Zunderwachstum hängt im wesentlichen von der Oberflächentemperatur des Bandes, der Verzunderungszeit, den Umgebungsbedingungen sowie dem Material des Bandes ab. Eine höhere Oberflächentemperatur, eine längere Verzunderungszeit sowie weichere Stähle bringen ein stärkeres Zunderwachstum mit sich.When operating hot strip rolling mills, secondary scales are rolled in observed on the surface of the tape. Tinder is an oxide layer which among other things when rolling steel on the strip. The scale growth depends essentially on the surface temperature of the strip, the scaling time, the environmental conditions and the material of the tape. A higher surface temperature, longer scaling time and softer Steels lead to stronger scale growth.

Um den Verschleiß von Arbeitswalzen der Gerüste einer Fertigstraße infolge von Zunderwachsturn zu vermeiden, wird in der US 5,235,840 vorgeschlagen, Zwischengerüstkühlungen zwischen einzelnen Gerüsten der Fertigstraße anzuordnen, die mittels einer Steuerung die Oberflächentemperatur des Bandes in einem definierten Bereich halten. Der in Laufrichtung des Bandes vor der Fertigstraße angeordnete Zunderwäscher besteht aus jeweils zwei auf beiden Seiten des Bandes gegenüberliegend angeordneten Sprühköpfen.
In der JP - A - 1 - 205 810 wird vorgeschlagen, die Temperaturdifferenz der Ober- und der Unterseite eines Bandes im Zunderwäscher in einem Bereich zwischen 0 ° C und 50 °C zu halten. In order to avoid the wear of work rolls of the stands of a finishing train due to scale growth, it is proposed in US Pat. No. 5,235,840 to arrange intermediate stand cooling between individual stands of the finishing train, which use a control to keep the surface temperature of the strip in a defined range. The scale washer arranged in the running direction of the belt in front of the finishing train consists of two spray heads arranged opposite each other on both sides of the belt.
JP - A - 1 - 205 810 proposes to keep the temperature difference between the top and bottom of a strip in the scale washer in a range between 0 ° C and 50 ° C.

Um beim Fertigwalzen in einer Warmbandwalzstraße das Zunderwachstum zu reduzieren, schlägt die EP 0 920 929 A2 vor, in Laufrichtung des Bandes vor dem ersten, zweiten und dritten Gerüst der Fertigstraße Oberflächenkühler vorzusehen, die jeweils zu beiden Seiten des Bandes gegenüberliegend angeordnete Düsenreihen aufweisen. Eine Steuerung bestimmt die Gesamtwassermenge, die von jeder Düsenreihe auf das Band aufgesprüht wird. Der in Laufrichtung des Bandes vor der Fertigstraße angeordnete Zunderwäscher besteht aus zwei auf beiden Seiten des Bandes gegenüberliegend angeordneten Düsenreihen.In order to increase scale growth during finish rolling in a hot strip mill reduce, EP 0 920 929 A2 proposes, in the running direction of the belt in front of the to provide first, second and third stands of the finishing mill surface cooler, the rows of nozzles arranged opposite each other on both sides of the belt exhibit. A controller determines the total amount of water by every row of nozzles is sprayed onto the belt. The in the direction of the belt The scale washer arranged in front of the finishing train consists of two on both Rows of nozzles arranged opposite each other on the belt.

In den Zunderwäschem vor der Fertigstraße wird dem Band mit hohem Entzunderungsdruck (etwa 200 bar) Wasser zugeführt. Durch die beidseitige Beaufschlagung mit Wasser wird dem Band Wärmeenergie entzogen. Infolge verschiedener Bedingungen an Ober- und Unterseite ergeben sich dort ungleiche Temperaturen. Aufgrund der eingangs beschriebenen Gesetzmäßigkeiten zum Zunderwachstum beginnt das Zunderwachstum unmittelbar in Laufrichtung hinter dem Düsenbalken erneut, wobei aufgrund der unterschiedlichenTemperaturen an den Randoberflächen der Sekundärzunder unterschiedlich schnell nachwächst. Außerdem bildet sich aufgrund der ungleichen Temperaturen ein verschieden harter Zunder aus.In the scale washers in front of the finishing train, the belt is subjected to high descaling pressure (about 200 bar) water. Due to the double-sided application thermal energy is extracted from the belt with water. As a result of different Conditions on the top and bottom result in uneven temperatures. Because of the laws of scale growth described at the beginning scale growth begins immediately behind the nozzle bar again, due to the different temperatures on the edge surfaces the secondary scale grows back at different speeds. Also forms a different hardness of scale due to the unequal temperatures.

In Folge Temperatur- und Zunderdifferenzen kommt es zu einem Schubwalzeneffekt, der Vibrationen in den Gerüsten der Fertigstraße anregt bzw. zu einer Skibildung am Bandkopf führen kann. Außerdem stellen sich unterschiedlich hohe Momente im Walzengerüst im Bereich der oberen und unteren Walzen ein.As a result of temperature and scale differences, there is a shear roller effect, which stimulates vibrations in the scaffolding of the finishing train or creates a ski can lead to the tape head. There are also moments of different heights in the roll stand in the area of the upper and lower rolls.

Die vorstehend genannten Probleme lassen sich durch die im Stand der Technik vorgeschlagenen Maßnahmen nicht vollständig kompensieren.The above problems can be solved by the prior art do not fully compensate for the proposed measures.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren vorzuschlagen, das die nachteiligen Auswirkungen unterschiedlicher Temperaturen sowie unterschiedlichen Zunderwachstums zwischen der Ober- und Unterseite des Bandes innerhalb der Fertigstraße verringert.The invention is therefore based on the object of proposing a method, that the adverse effects of different temperatures as well as different Scale growth between the top and bottom of the belt reduced within the finishing train.

Die Lösung dieser Aufgabe beruht auf dem Gedanken, die erforderlichen Maßnahmen zur Vermeidung ungleichmäßigen Temperaturen sowie Zunderwachstums bereits im Bereich des Zunderwäschers zu ergreifen, indem das Band im Zunderwäscher an mehreren in Laufrichtung hintereinander angeordneten Stellen mit Wasser unter Entzunderungsdruck beaufschlagt wird, wobei sich die in Laufrichtung letzte Stelle an der Unterseite in einem Abstand zu der letzten Stelle an der Oberseite und näher an der Fertigstraße befindet.The solution to this task is based on the idea of the necessary measures to avoid uneven temperatures and scale growth already in the area of the scale washer to seize by the tape in the scale washer on several arranged one behind the other in the running direction Places with water under descaling pressure, the in Direction of travel last position on the underside at a distance from the last position located at the top and closer to the finishing train.

Die Beaufschlagung mit Wasser an den verschiedenen Stellen des Bandes erfolgt beispielsweise mittels an sich bekannter Düsenreihen. Der zu wählende Abstand der letzten Düsenreihe an der Unterseite von der letzten Düsenreihe an der Oberseite hängt von dem Unterschied der Kühlwirkung an der Ober- und Unterseite und von dem Zunderwachstums des gewalzten Materials in der jeweiligen Walzstraße ab.Water is applied at the various points on the belt for example by means of rows of nozzles known per se. The distance to choose the last row of nozzles at the bottom from the last row of nozzles at the top depends on the difference in cooling effect on the top and bottom and the scale growth of the rolled material in the respective rolling mill from.

Um den Abstand zwischen der letzten Düsenreihe an der Unterseite und der Oberseite kürzer als durch den Temperaturunterschied gerechtfertigt halten zu können, kann die Unterseite in einer Ausgestaltung der Erfindung insgesamt mit einer größeren Wassermenge unter Entzunderungsdruck als die Oberseite des Bandes beaufschlagt werden. Ein geringerer Abstand zwischen den beiden letzten Düsenreihen kann aufgrund konstruktiver Zwänge an der Walzstraße erforderlich sein. Er empfiehlt sich jedoch auch, um eine insgesamt zu große Dicke der Zunderschicht an der Oberseite des Bandes zu vermeiden.To the distance between the last row of nozzles on the bottom and the Keep the top shorter than justified by the temperature difference can, the underside in one embodiment of the invention as a whole a larger amount of water under descaling pressure than the top of the Band are applied. A smaller distance between the last two Row of nozzles may be necessary due to design constraints on the rolling mill his. However, it is also recommended to make the scale layer too thick overall to avoid at the top of the tape.

In Versuchen hat sich herausgestellt, daß die Wassermenge an der Unterseite etwa 60 % - 80 %, insbesondere 70 % der Gesamtwassermenge betragen sollte, die mittels der Düsenreihen an der Unter- und Oberseite auf das Band im Zunderwäscher aufgebracht wird.Experiments have shown that the amount of water at the bottom about 60% - 80%, in particular 70% of the total amount of water that should be applied to the belt in the Scale washer is applied.

Um die mit einer größeren Wassermenge unter Entzunderungsdruck verbundenen Energiekosten zu reduzieren, wird in einer Ausgestaltung der Erfindung alternativ eine zusätzliche Kühlung an der Unterseite des Bandes mit Wasser unter niedrigerem Druck im Bereich zwischen 4 bar und 10 bar vorgeschlagen. Selbstverständlich liegt es im Rahmen der Erfindung, dieser Maßnahmen auch ergänzend zu denen nach Anspruch 3 vorzusehen.To those associated with a larger amount of water under descaling pressure Reducing energy costs is in one embodiment of the invention alternatively, additional cooling on the underside of the belt with water proposed under lower pressure in the range between 4 bar and 10 bar. It goes without saying that these measures are also within the scope of the invention to provide in addition to those according to claim 3.

In vorteilhafter Ausgestaltung der Erfindung erfolgt die Beaufschlagung mit Wasser unter niedrigerem Druck in Laufrichtung des Bandes mittels Düsenreihen vor und/oder hinter der letzten Stelle an der Unterseite des Bandes, an der dieses mit Wasser unter Entzunderungsdruck beaufschlagt wird.In an advantageous embodiment of the invention, the application takes place with Water at a lower pressure in the direction of travel of the belt using rows of nozzles before and / or after the last position on the underside of the tape, at the this is pressurized with water under descaling pressure.

Die für eine symmetrische Temperaturverteilung erforderliche Wassermenge hängt von der Einzugsgeschwindigkeit vor der Fertigstraße, dem Verschleiß der Entzunderungsdüsen in den Düsenreihen, von dem Druckniveau sowie der Breite des Bandes ab. Um sich den wechselnden Randbedingungen an der Walzstraße anpassen zu können, ist die Menge des unter Entzunderungsdruck und niedrigem Druck auf das Band aufgebrachten Wassers vorzugsweise einstellbar.The amount of water required for a symmetrical temperature distribution depends on the feed speed before the finishing train, the wear of the Descaling nozzles in the nozzle rows, from the pressure level and the Width of the tape. In order to adapt to the changing boundary conditions at the Being able to adjust the rolling mill is the amount of descaling pressure and low pressure on the tape applied water preferably adjustable.

In vorteilhafter Ausgestaltung der Erfindung wird die symmetrische Temperaturverteilung an der Ober- und Unterseite des Bandes überwacht, indem berührungslos, insbesondere mit in Laufrichtung des Bandes hinter dem Zunderwäscher angeordneten Pyrometern, die Temperaturen an der Ober- und Unterseite des Bandes gemessen werden.In an advantageous embodiment of the invention, the symmetrical temperature distribution monitored on the top and bottom of the belt by non-contact, especially behind the scale washer in the direction of the belt arranged pyrometers, the temperatures on the top and bottom of the tape can be measured.

Insbesondere die Menge des Wassers unter niedrigerem Druck kann dann als Stellgröße eines Regelkreises so verändert werden, daß auf der Ober- und Unterseite stets gleiche Temperaturen gemessen werden. Alternativ oder zusätzlich zu den Temperaturen können als Regelgröße die Walzmomente an mindestens einem Gerüst der Fertigstraße oberhalb und unterhalb des Bandes gemessen werden.In particular, the amount of water under lower pressure can then be as The manipulated variable of a control loop can be changed so that on the upper and Same temperatures are always measured on the underside. Alternatively or additionally The rolling torques can be used as a control variable for the temperatures at least one scaffold of the finishing train above and below the belt be measured.

Zur Unterstützung der Wirkung der am Zunderwäscher getroffenen Maßnahmen ist in einer Ausgestaltung der Erfindung vorgesehen, daß das Band zumindest zwischen den ersten beiden Gerüsten der Fertigstraße mit Wasser beaufschlagt wird, wobei die Unterseite insgesamt mit einer größeren Wassermenge als die Oberseite des Bandes beaufschlagt wird. Auch die Anordnung der oberen und unteren Balken kann mit dem Abstand y versetzt zueinander erfolgen.To support the effect of the measures taken on the scale washer is provided in one embodiment of the invention that the tape at least between the first two scaffolds of the finishing train with water is, the bottom with a larger amount of water than the top of the band is applied. Even the arrangement the upper and lower bars can be offset from each other by the distance y respectively.

Auch die innerhalb der Fertigstraße getroffenen Maßnahmen können mit Hilfe eines Regelkreises überwacht werden, mit den gemessenen Temperaturen an der Bandober- und -unterseite als Regelgröße und der zugeführten Wassermenge als Steligröße.The measures taken within the finishing train can also be used with the help of a control loop can be monitored with the measured temperatures the top and bottom of the belt as a controlled variable and the amount of water supplied as stele size.

Nachfolgend wird die Erfindung anhand der Figuren näher erläutert. Es zeigen

Figur 1
ein Prinzipdarstellung zur Veranschaulichung des erfindungsgemäßen Verfahrens,
Figur 2
eine Seitenansicht eines Zunderwäschers in einer Walzstraße sowie
Figur 3
eine Seitenansicht eines Zunderwäschers in einer Walzstraße mit einer Zusatzkühlung.
The invention is explained in more detail below with reference to the figures. Show it
Figure 1
1 shows a schematic diagram to illustrate the method according to the invention,
Figure 2
a side view of a scale washer in a rolling mill as well
Figure 3
a side view of a scale washer in a rolling mill with additional cooling.

Figur 1 zeigt eine Fertigstraße 1 mit einem in Laufrichtung 2 davor angeordnetem Zunderwäscher 3 in einer Warmbandwalzstraße. Das die Warmbandwalzstraße durchlaufende Band 4 wird in dem Zunderwäscher 3 auf der Oberseite 5 und der Unterseite 6 von insgesamt vier Düsenreihen 7, 8 mit Wasser unter Entzunderungsdruck von etwa 200 bar beaufschlagt. Die an der Unterseite 6 in Laufrichtung 2 letzte Düsenreihe 8 befindet sich näher an der Fertigstraße 1 als die in Laufrichtung letzte Düsenreihe 7 an der Oberseite 5, um eine symmetrische Temperaturverteilung an der Ober- und Unterseite 5, 6 des Bandes 4 zu erzielen. Diese Maßnahme wird durch zwei weitere Düsenreihen 9 in Laufrichtung vor und hinter der letzten Düsenreihe 8 unterstützt, wobei die Düsenreihen 9 die Unterseite des Bandes mit Wasser unter Niederdruck von etwa 4 - 10 bar beaufschlagen. Die mittels der Düsenreihen 9 auf die Unterseite 6 aufgebrachte Wassermenge ist einstellbar.FIG. 1 shows a finishing train 1 with one arranged upstream in the direction of travel 2 Tinder washer 3 in a hot strip mill. That is the hot strip mill continuous belt 4 is in the scale washer 3 on the top 5 and the bottom 6 of a total of four nozzle rows 7, 8 with water below Descaling pressure of about 200 bar. The at the bottom 6 in Direction 2 of the last row of nozzles 8 is closer to the finishing train 1 than the last row of nozzles 7 in the running direction at the top 5 by a symmetrical Temperature distribution on the top and bottom 5, 6 of the band 4 too achieve. This measure is carried out by two further rows of nozzles 9 in the running direction Supported in front of and behind the last row of nozzles 8, the rows of nozzles 9 the underside of the belt with water under low pressure of about 4 - 10 bar apply. The applied to the bottom 6 by means of the nozzle rows 9 The amount of water is adjustable.

Der Abstand 11 zwischen der letzten Düsenreihe 7 an der Oberseite und der letzten Düsenreihe 8 an der Unterseite des Bandes ist grundsätzlich so zu bestimmen, daß der Kühleffekt des auf der Oberseite 5 des Bandes der Unterseite 6 entspricht. Der Abstand 11 kann jedoch aus konstruktiven Gründen, beispielsweise dem Platzbedarf des Zunderwäschers, der Anordnung von Rollen oder Rohrleitungen begrenzt sein. Aus diesem Grund wird die Kühlung der Unterseite 6 des Bandes durch die Düsenreihen 9 mit Niederdruck unterstützt. Schließlich wäre ein zu großer Abstand 11 nachteilig, da sich aufgrund des längeren Weges von der letzten Düsenreihe 7 an der Oberseite 5 bis zum Einlauf in die Fertigstraße 1 wieder eine insgesamt dickere Zunderschicht an der Oberseite ausbilden kann.The distance 11 between the last row of nozzles 7 at the top and the The last row of nozzles 8 on the underside of the belt must always be determined that the cooling effect of the on the top 5 of the band the bottom 6 corresponds. The distance 11 can, however, for design reasons, for example the space requirement of the scale washer, the arrangement of rollers or pipes may be limited. For this reason, the cooling of the Bottom 6 of the band supported by the nozzle rows 9 with low pressure. Finally, an excessively large distance 11 would be disadvantageous because the longer Path from the last row of nozzles 7 at the top 5 to the inlet in the finishing line 1 again a thicker layer of scale on the top can train.

Die Wirksamkeit der Kühlung infolge der Entzunderung mittels den Düsenreihen 7, 8 sowie der Zusatzkühlung durch die Düsenreihen 9 wird durch an der Ober-und Unterseite 5, 6 angeordnete Pyrometer 12 vor dem Einlauf in ein erstes Gerüst F1 der Fertigstraße bzw. durch die Pyrometer innerhalb der Fertigstraße 12' überwacht. Schließlich werden an den ersten drei Gerüsten F1 - F3 der Fertigstraße 1 die an den oberen und unteren Spindeln 13 der Arbeitswalzen auftretenden Momente gemessen. Die von den Pyrometern 12 bzw. 12' gemessenen Temperaturen To, Tu sowie die an den Arbeitswalzen gemessenen Momente Mw1u-3u, MW10-3o fließen als Regelgröße in einen rechnergestützten Regelkreis ein, der als Stellgröße die über die Düsenreihen 9 aufgebrachte Wassermenge VZ bzw. die innerhalb der Straße eingesetzte Wassermengen Voi, Vui, und Voj, Vuj der Düsenreihen 17, 17' und 18, 18' beeinflußt, um die angestrebte symmetrische Temperaturverteilung an Ober- und Unterseite 5, 6 des Bandes aufrechtzuerhalten bzw. die Momentenverteilung zu beeinflussen. Die Düsenreihen 17, 17' bzw. 18, 18' können in dem Abstand 10 versetzt angeordnet sein. Zur Adaption des Rechners 14 an die jeweiligen Produktionsbedingungen, werden die Anlagedaten 15 und die Prozeßdaten 16 eingelesen. Folgende Adaptionsdaten sind zur Bestimmung der notwendigen Wassermenge für die Zusatzkühlung über die Düsenreihen 9 bzw. für die Vertrimmung der Wassermengen Voi, Vui, und Voj, Vuj der Düsenreihen 17, 17' und 18, 18' innerhalb der Fertigstraße erforderlich:

  • Die Einzugsgeschwindigkeit des Bandes vor der Fertigstraße 1 ändert sich abhängig von der Fertigbanddicke und dem Bandmaterial
  • die Düsen in den Düsenreihen 7, 8 unterliegen einem Verschleiß, so daß sich die Wassermenge im Laufe der Zeit ändert
  • das Druckniveau im Versorgungsnetz der Düsenreihen 7 schwankt,
  • unterschiedliche Breiten des Bandes 4 beeinflussen das Ablaufen des auf der Oberseite 5 des Bandes 4 stehenden Wassers.
The effectiveness of the cooling as a result of the descaling by means of the nozzle rows 7, 8 and the additional cooling by the nozzle rows 9 is determined by pyrometers 12 arranged on the top and bottom 5, 6 before entering a first stand F1 of the finishing train or by the pyrometers inside the finishing train 12 'monitored. Finally, the moments occurring on the upper and lower spindles 13 of the work rolls are measured on the first three stands F1-F3 of the finishing train 1. The temperatures T o , T u measured by the pyrometers 12 and 12 'as well as the moments M w1u-3u , M W10-3o measured on the work rolls flow as a control variable into a computer-aided control circuit which, as the control variable, applies the one applied via the nozzle rows 9 Amount of water V Z or the amount of water V oi , V ui , and V oj , V uj used in the street of the nozzle rows 17, 17 'and 18, 18' is influenced by the desired symmetrical temperature distribution on the top and bottom 5, 6 of the Maintain band or influence the torque distribution. The rows of nozzles 17, 17 'and 18, 18' can be arranged offset at the distance 10. The system data 15 and the process data 16 are read in to adapt the computer 14 to the respective production conditions. The following adaptation data are required to determine the amount of water required for additional cooling via the nozzle rows 9 or for trimming the water amounts V oi , V ui , and V oj , V uj of the nozzle rows 17, 17 'and 18, 18' within the finishing train:
  • The feed speed of the strip in front of the finishing train 1 changes depending on the finished strip thickness and the strip material
  • the nozzles in the nozzle rows 7, 8 are subject to wear, so that the amount of water changes over time
  • the pressure level in the supply network of the nozzle rows 7 fluctuates,
  • different widths of the band 4 influence the running of the water standing on the top 5 of the band 4.

Figur 2 zeigt in schematischer Seitenansicht einen Zunderwäscher 3, allerdings ohne Düsenreihen 9 für Niederdruckwasser. In diesem Ausführungsbeispiel wird die symmetrische Temperaturverteilung an der Ober- und Unterseite 5, 6 des Bandes 4 lediglich durch die in dem Abstand 11 versetzte Anordnung der in Laufrichtung 2 letzten Düsenreihen 7 erzielt. Weiter ist aus Figur 2 zu erkennen, daß an der Oberseite 5 des Bandes sogenannte Wasserauffangrinnen 17 angeordnet sind, die zusätzlich den Kühleffekt auf der Bandoberseite 5 reduzieren und in begrenztem Umfang als Stellglied eingesetzt werden können.Figure 2 shows a schematic side view of a scale washer 3, however without rows of nozzles 9 for low pressure water. In this embodiment the symmetrical temperature distribution on the top and bottom 5, 6 of the band 4 only by the offset in the spacing 11 in Direction 2 last nozzle rows 7 achieved. It can also be seen from FIG. 2 that on the top 5 of the belt so-called water collecting channels 17th are arranged, which additionally reduce the cooling effect on the belt top 5 and can be used to a limited extent as an actuator.

Figur 3 zeigt schließlich einen Zunderwäscher 3, bei dem eine Beaufschlagung des Bandes 4 mit Wasser unter niedrigerem Druck mit einer Düsenreihe 9 vor und zwei Düsenreihen 9 hinter der letzten Düsenreihe 7 an der Unterseite des Bandes erfolgt, an der dieses mit Wasser unter Entzunderungsdruck beaufschlagt wird. Figure 3 finally shows a scale washer 3, in which an application the tape 4 with water under lower pressure with a row of nozzles 9 before and two rows of nozzles 9 behind the last row of nozzles 7 on the underside of the Belt takes place on which this is pressurized with water under descaling pressure becomes.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1.1.
Fertigstraßefinishing line
2.Second
Laufrichtung des BandesDirection of the belt
3.Third
Zunderwäscherdescaling
4.4th
Bandtape
5.5th
Oberseitetop
6.6th
Unterseitebottom
7.7th
Düsenreihen (Entzunderungsdruck)Rows of nozzles (descaling pressure)
8.8th.
Düsenreihen (Entzunderungsdruck)Rows of nozzles (descaling pressure)
9.9th
Düsenreihe (Niederdruck)Nozzle row (low pressure)
10.10th
Abstand yDistance y
11.11th
Abstand xDistance x
12., 12'12, 12 '
Pyrometerpyrometer
13.13th
MeßpunkteMeasuring points
14.14th
Rechnercomputer
15.15th
Anlagedatenplant data
16.16th
Düsenreihen innerhalb der FertigstraßeRow of nozzles within the finishing train
17., 17'17th, 17th '
Düsenreihen innerhalb der FertigstraßeRow of nozzles within the finishing train
18., 18'18, 18 '
Düsenreihen innerhalb der FertigstraßeRow of nozzles within the finishing train

Claims (7)

  1. Method of descaling strips (4) in a rolling train with a scale washer (3) as well as a finishing train (1) arranged behind the scale washer (3) in running direction (2) of the strip (4), in which the strip (4) is acted on by water under descaling pressure on the upper and lower side (5, 6) in the scale washer (3) and is cooled within the finishing train (1), wherein a symmetrical temperature distribution is produced at the upper and lower side (5, 6) of the strip (4) in the scale washer (3) and is maintained in the same manner within the finishing train, wherein the strip (4) is acted on by water under descaling pressure at several locations (7, 8), which are arranged in succession in the running direction (2), in the scale washer (3), characterised in that the last location (8) in the running direction at the lower side (6) is disposed at a spacing (11) from the last location (7) at the upper side (5) and close to the finishing train (1).
  2. Method according to claim 1, characterised in that the lower side (6) is acted on, additionally to the water under descaling pressure, by water at lower pressure in the range between 4 and 10 bars.
  3. Method according to claim 2, characterised in that the action by water under lower pressure is carried out in the running direction (2) of the strip (4) in front of and/or behind the last location (8) at the lower side (6) of the strip (4) at which this is acted on by water under descaling pressure.
  4. Method according to claim 2 or 3, characterised in that the quantity of the water applied under descaling pressure and lower pressure to the strip (4) is adjustable.
  5. Method according to claim 4, characterised in that the temperatures at the upper and lower side (5, 6) of the strip (4) are contactlessly measured, particularly by a pyrometer, in the running direction (2) thereof behind the scale washer (3) and/or the rolling moments at at least one stand of the finishing train (1) are measured above and below the strip (4) as a regulating magnitude of a regulating circuit and the adjustable water quantity as a setting magnitude of the regulating circuit is changed by means of a computer unit (14).
  6. Method according to one of claims 1 to 5, characterised in that the strip (4) is acted on by water at least between the first two stands F1, F2 of the finishing train, wherein the lower side (6) is loaded overall with a greater quantity of water than the upper side (5) of the strip (4).
  7. Method according to one of claims 1 to 6, characterised in that the upper and lower bars are arranged to be offset relative to one another.
EP02700270A 2001-03-03 2002-02-23 Method for removing scale from strips Expired - Lifetime EP1365870B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10110324 2001-03-03
DE10110324A DE10110324A1 (en) 2001-03-03 2001-03-03 Process for descaling tapes
PCT/EP2002/001927 WO2002070157A1 (en) 2001-03-03 2002-02-23 Method for removing scale from strips

Publications (2)

Publication Number Publication Date
EP1365870A1 EP1365870A1 (en) 2003-12-03
EP1365870B1 true EP1365870B1 (en) 2004-10-20

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EP02700270A Expired - Lifetime EP1365870B1 (en) 2001-03-03 2002-02-23 Method for removing scale from strips

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US (1) US7181943B2 (en)
EP (1) EP1365870B1 (en)
JP (1) JP4136662B2 (en)
CN (1) CN1269584C (en)
AT (1) ATE280003T1 (en)
CZ (1) CZ298608B6 (en)
DE (2) DE10110324A1 (en)
RU (1) RU2281174C2 (en)
TW (1) TW505549B (en)
UA (1) UA76744C2 (en)
WO (1) WO2002070157A1 (en)

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CZ298608B6 (en) 2007-11-21
JP4136662B2 (en) 2008-08-20
CN1494466A (en) 2004-05-05
UA76744C2 (en) 2006-09-15
EP1365870A1 (en) 2003-12-03
DE10110324A1 (en) 2002-09-05
DE50201360D1 (en) 2004-11-25
WO2002070157A1 (en) 2002-09-12
US20040069034A1 (en) 2004-04-15
ATE280003T1 (en) 2004-11-15
RU2281174C2 (en) 2006-08-10
TW505549B (en) 2002-10-11
CN1269584C (en) 2006-08-16
US7181943B2 (en) 2007-02-27
JP2004529771A (en) 2004-09-30
RU2003129452A (en) 2005-02-10
CZ20032377A3 (en) 2004-02-18

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