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EP1365870A1 - Method for removing scale from strips - Google Patents

Method for removing scale from strips

Info

Publication number
EP1365870A1
EP1365870A1 EP02700270A EP02700270A EP1365870A1 EP 1365870 A1 EP1365870 A1 EP 1365870A1 EP 02700270 A EP02700270 A EP 02700270A EP 02700270 A EP02700270 A EP 02700270A EP 1365870 A1 EP1365870 A1 EP 1365870A1
Authority
EP
European Patent Office
Prior art keywords
water
belt
strip
finishing train
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.)
Granted
Application number
EP02700270A
Other languages
German (de)
French (fr)
Other versions
EP1365870B1 (en
Inventor
Jürgen Seidel
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 Siemag AG
Original Assignee
SMS Demag AG
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 SMS Demag AG filed Critical SMS Demag AG
Publication of EP1365870A1 publication Critical patent/EP1365870A1/en
Application granted granted Critical
Publication of EP1365870B1 publication Critical patent/EP1365870B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—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 a finishing train arranged behind the scale washer in the running direction of the strip, in which the belt is pressurized with water in the scale washer and inside the rolling mill on the top and bottom ,
  • Tinder is an oxide layer that, among other things, when rolling steel on the strip.
  • the scale growth essentially depends on the surface temperature of the strip, the scaling time, the ambient conditions and the material of the strip. A higher surface temperature, a longer scaling time and softer steels result in stronger scale growth.
  • EP 0 920 929 A2 proposes to provide surface coolers in the running direction of the strip in front of the first, second and third stands of the finishing train, which are arranged opposite each other on both sides of the strip. Nete rows of nozzles. A controller determines the total amount of water that is sprayed onto the belt from each row of nozzles.
  • the scale washer arranged in the running direction of the strip in front of the finishing train consists of two rows of nozzles arranged opposite each other on both sides of the strip.
  • the invention is therefore based on the object of proposing a method which reduces the disadvantageous effects of different temperatures and different scale growth between the top and bottom of the strip within the finishing train.
  • the solution to this problem is based on the idea of taking the necessary measures to avoid uneven temperatures and scale growth in the area of the scale washer by creating a symmetrical temperature distribution on the top and bottom of the belt there. As a result, more symmetrical conditions are formed, so that the disadvantages in the finishing train are avoided.
  • the symmetrical temperature distribution between the top and bottom of the belt can advantageously be achieved by applying descaling pressure to the belt in the scale washer at several points arranged one behind the other in the running direction, with the last point on the underside at a distance from one another in the running direction the last place at the top and closer to the finishing train.
  • the application of water at the various points on the belt takes place, for example, by means of rows of nozzles known per se.
  • the distance to be selected for the last row of nozzles on the underside from the last row of nozzles on the top depends on the difference in cooling effect on the top and bottom and on the scale growth of the rolled material in the respective rolling mill.
  • the bottom can be subjected to a larger amount of water under descaling pressure than the top of the belt.
  • a smaller distance between the last two rows of nozzles may be necessary due to design constraints on the rolling mill.
  • the amount of water on the underside is approximately 60% -80%, in particular 70%, of the total amount of water should be applied to the belt in the scale washer using the rows of nozzles on the bottom and top.
  • an additional cooling is alternatively proposed on the underside of the belt with water under a lower pressure in the range between 4 bar and 10 bar. It is of course within the scope of the invention to provide these measures in addition to those according to claim 3.
  • water is applied at a lower pressure in the direction of travel of the belt by means of rows of nozzles in front of and / or behind the last point on the underside of the belt at which water is subjected to 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, the pressure level and the width of the belt. In order to be able to adapt to the changing boundary conditions on the rolling mill, the amount of water applied to the strip under descaling pressure and low pressure is preferably adjustable.
  • the symmetrical temperature distribution on the top and bottom of the belt is monitored by measuring the temperatures on the top and bottom of the belt without contact, in particular with pyrometers arranged behind the scale washer in the running direction of the belt.
  • the amount of water under lower pressure can then be changed as a manipulated variable of a control loop so that on the upper and
  • the rolling moments can be measured as a control variable on at least one stand of the finishing train above and below the strip.
  • one embodiment of the invention provides that the strip is acted upon with water at least between the first two stands of the finishing train, the bottom side being exposed to a larger amount of water than the top side of the strip ,
  • the upper and lower bars can also be arranged offset from one another with the distance y.
  • the measures taken within the finishing train can also be monitored with the help of a control circuit, with the measured temperatures on the top and bottom of the strip as the control variable and the amount of water supplied as the control variable.
  • FIG. 1 shows a schematic diagram to illustrate the method according to the invention
  • Figure 2 is a side view of a scale washer in a rolling mill
  • Figure 3 is a side view of a scale washer in a rolling mill with additional cooling.
  • FIG. 1 shows a finishing train 1 with a scale washer 3 arranged in front of it in the running direction 2 in a hot strip rolling mill.
  • the strip 4 passing through the hot strip rolling mill is in the scale washer 3 on the top 5 and the bottom 6 of a total of four rows of nozzles 7, 8 with water underneath Descaling pressure of about 200 bar.
  • the last row of nozzles 8 on the underside 6 in the running direction 2 is closer to the finishing train 1 than the last row of nozzles 7 in the running direction on the top 5 in order to achieve a symmetrical temperature distribution on the top and bottom 5, 6 of the belt 4.
  • the distance 11 between the last row of nozzles 7 on the upper side and the last row of nozzles 8 on the underside of the belt is to be determined in principle so that the cooling effect corresponds to that on the upper side 5 of the belt of the lower side 6.
  • the distance 11 can be limited for constructional reasons, for example the space requirement of the scale washer, the arrangement of rollers or pipes. For this reason, the cooling of the underside 6 of the band is supported by the nozzle rows 9 with low pressure.
  • an excessively large distance 11 would be disadvantageous since, due to the longer path from the last row of nozzles 7 on the upper side 5 to the entry into the finishing train 1, an overall thicker scale layer can be formed on the upper side.
  • the effectiveness of the cooling due to 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 0 , T u measured by the pyrometers 12 and 12 'as well as the moments M w iu 3 u measured on the work rolls.
  • M ⁇ o-3o flow as a control variable into a computer-aided control circuit which, as the control variable, is applied via the nozzle rows 9
  • Amount of water V z or the amount of water V 0 i, V U j, and V 0 j, V Uj used in the street of the rows of nozzles 17, 17 'and 18, 18' is influenced by the desired symmetrical temperature distribution on the top and bottom 5 , 6 of the tape or to influence the moment 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 internal for determining the amount of water required for additional cooling via the nozzle rows 9 or for trimming the amounts of water V 0 j, V U j, and V 0 j, V UJ - of the nozzle graters 17, 17 "and 18, 18 ' - required halfway through 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
  • Figure 2 shows a schematic side view of a scale washer 3, but without rows of nozzles 9 for low pressure water.
  • the symmetrical temperature distribution on the upper and lower sides 5, 6 of the band 4 is achieved only by the arrangement of the last rows of nozzles 7 in the running direction 2 offset at the distance 11.
  • so-called water collecting channels 17 are located on the top 5 of the belt are arranged, which additionally reduce the cooling effect on the belt top 5 and can be used to a limited extent as an actuator.
  • FIG. 3 finally shows a scale washer 3, in which the band 4 is exposed to water at a lower pressure with a row of nozzles 9 in front and two rows of nozzles 9 behind the last row of nozzles 7 on the underside of the band, to which water is subjected to descaling pressure ,

Landscapes

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

Verfahren zum Entzundern von BändernProcess for descaling tapes
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.The invention relates to a method for descaling strips in a rolling mill with a scale washer and a finishing train arranged behind the scale washer in the running direction of the strip, in which the belt is pressurized with water in the scale washer and inside the rolling mill on the top and bottom ,
Beim Betrieb von Warmbandwalzstraßen werden Sekundärzundereinwalzun- gen 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 scale rolling is observed on the strip surface. Tinder is an oxide layer that, among other things, when rolling steel on the strip. The scale growth essentially depends on the surface temperature of the strip, the scaling time, the ambient conditions and the material of the strip. A higher surface temperature, a longer scaling time and softer steels result in stronger scale growth.
Um den Verschleiß von Arbeitswalzen der Gerüste einer Fertigstraße infolge von Zunderwachstum 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 Fer- tigstraße angeordnete Zunderwäscher besteht aus jeweils zwei auf beiden Seiten des Bandes gegenüberliegend angeordneten Sprühköpfen.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 keep the surface temperature of the strip in a defined range by means of a controller. 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.
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 angeord- nete 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 reduce scale growth during finish rolling in a hot strip rolling mill, EP 0 920 929 A2 proposes to provide surface coolers in the running direction of the strip in front of the first, second and third stands of the finishing train, which are arranged opposite each other on both sides of the strip. Nete rows of nozzles. A controller determines the total amount of water that is sprayed onto the belt from each row of nozzles. The scale washer arranged in the running direction of the strip in front of the finishing train consists of two rows of nozzles arranged opposite each other on both sides of the strip.
In den Zunderwäschern vor der Fertigstraße wird dem Band mit hohem Entzun- derungsdruck (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 unterschiedlichen Temperaturen an den Bandoberflächen 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, water is fed to the belt at a high counter-pressure (about 200 bar). By applying water on both sides, thermal energy is extracted from the belt. Due to different conditions on the top and bottom, there are uneven temperatures. Due to the laws of scale growth described at the beginning, scale growth begins again directly in the direction of travel behind the nozzle bar, the secondary scale growing again at different rates due to the different temperatures on the strip surfaces. In addition, due to the uneven temperatures, a different hard scale develops.
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 unterschied- lieh hohe Momente im Walzengerüst im Bereich der oberen und unteren Walzen ein.As a result of temperature and scale differences, there is a thrust roller effect that stimulates vibrations in the scaffolding of the finishing train or can lead to ski formation on the belt head. In addition, there are different torques 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-mentioned problems cannot be fully compensated for by the measures proposed in the prior art.
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. 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 eine symmetrische Temperaturverteilung an der Ober- und Unterseite des Bandes bereits dort erzeugt wird. Folglich bilden sich symmetrischere Bedingungen aus, so daß die Nachteile in der Fertigstraße vermieden werden.The invention is therefore based on the object of proposing a method which reduces the disadvantageous effects of different temperatures and different scale growth between the top and bottom of the strip within the finishing train. The solution to this problem is based on the idea of taking the necessary measures to avoid uneven temperatures and scale growth in the area of the scale washer by creating a symmetrical temperature distribution on the top and bottom of the belt there. As a result, more symmetrical conditions are formed, so that the disadvantages in the finishing train are avoided.
Vorteilhaft läßt sich die symmetrische Temperaturverteilung zwischen der Ober- und Unterseite des Bandes dadurch erzielen, daß 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 symmetrical temperature distribution between the top and bottom of the belt can advantageously be achieved by applying descaling pressure to the belt in the scale washer at several points arranged one behind the other in the running direction, with the last point on the underside at a distance from one another in the running direction the last place at the top and closer to the finishing train.
Die Beaufschlagung mit Wasser an den verschiedenen Stellen des Bandes er- folgt 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.The application of water at the various points on the belt takes place, for example, by means of rows of nozzles known per se. The distance to be selected for the last row of nozzles on the underside from the last row of nozzles on the top depends on the difference in cooling effect on the top and bottom and on the scale growth of the rolled material in the respective rolling mill.
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.In order to be able to keep the distance between the last row of nozzles on the underside and the top shorter than justified by the temperature difference, in one embodiment of the invention the bottom can be subjected to a larger amount of water under descaling pressure than the top of the belt. A smaller distance between the last two rows of nozzles may be necessary due to design constraints on the rolling mill. However, it is also recommended to avoid an overall excessive thickness of the scale layer on the top of the belt.
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 on the underside is approximately 60% -80%, in particular 70%, of the total amount of water should be applied to the belt in the scale washer using the rows of nozzles on the bottom and top.
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.In order to reduce the energy costs associated with a larger amount of water under descaling pressure, in one embodiment of the invention an additional cooling is alternatively proposed on the underside of the belt with water under a lower pressure in the range between 4 bar and 10 bar. It is of course within the scope of the invention to provide these measures 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, water is applied at a lower pressure in the direction of travel of the belt by means of rows of nozzles in front of and / or behind the last point on the underside of the belt at which water is subjected to 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, the pressure level and the width of the belt. In order to be able to adapt to the changing boundary conditions on the rolling mill, the amount of water applied to the strip under descaling pressure and low pressure is preferably adjustable.
In vorteilhafter Ausgestaltung der Erfindung wird die symmetrische Temperaturverteilung an der Ober- und Unterseite des Bandes überwacht, indem berüh- rungslos, 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 on the top and bottom of the belt is monitored by measuring the temperatures on the top and bottom of the belt without contact, in particular with pyrometers arranged behind the scale washer in the running direction of the belt.
Insbesondere die Menge des Wassers unter niedrigerem Druck kann dann als Stellgröße eines Regelkreises so verändert werden, daß auf der Ober- undIn particular, the amount of water under lower pressure can then be changed as a manipulated variable of a control loop so that on the upper and
Unterseite stets gleiche Temperaturen gemessen werden. Alternativ oder zu- sätzlich zu den Temperaturen können als Regelgröße die Walzmomente an mindestens einem Gerüst der Fertigstraße oberhalb und unterhalb des Bandes gemessen werden.Same temperatures are always measured on the underside. Alternatively or In addition to the temperatures, the rolling moments can be measured as a control variable on at least one stand of the finishing train above and below the strip.
Zur Unterstützung der Wirkung der am Zunderwäscher getroffenen Maßnah- men 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.In order to support the effect of the measures taken on the scale washer, one embodiment of the invention provides that the strip is acted upon with water at least between the first two stands of the finishing train, the bottom side being exposed to a larger amount of water than the top side of the strip , The upper and lower bars can also be arranged offset from one another with the distance y.
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 Wasser- menge als Stellgröße.The measures taken within the finishing train can also be monitored with the help of a control circuit, with the measured temperatures on the top and bottom of the strip as the control variable and the amount of water supplied as the control variable.
Nachfolgend wird die Erfindung anhand der Figuren näher erläutert. Es zeigenThe invention is explained in more detail below with reference to the figures. Show it
Figur 1 ein Prinzipdarstellung zur Veranschaulichung des erfin- dungsgemäßen Verfahrens,FIG. 1 shows a schematic diagram to illustrate the method according to the invention,
Figur 2 eine Seitenansicht eines Zunderwäschers in einer Walzstraße sowieFigure 2 is a side view of a scale washer in a rolling mill and
Figur 3 eine Seitenansicht eines Zunderwäschers in einer Walzstraße mit einer Zusatzkühlung.Figure 3 is 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 Warmbandwalz- straße 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 Laufrich- tung 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 a scale washer 3 arranged in front of it in the running direction 2 in a hot strip rolling mill. The strip 4 passing through the hot strip rolling mill is in the scale washer 3 on the top 5 and the bottom 6 of a total of four rows of nozzles 7, 8 with water underneath Descaling pressure of about 200 bar. The last row of nozzles 8 on the underside 6 in the running direction 2 is closer to the finishing train 1 than the last row of nozzles 7 in the running direction on the top 5 in order to achieve a symmetrical temperature distribution on the top and bottom 5, 6 of the belt 4. This measure is supported by two further rows of nozzles 9 in the running direction in front of and behind the last row of nozzles 8, the rows of nozzles 9 applying water to the underside of the belt at a low pressure of about 4-10 bar. The amount of water applied to the underside 6 by means of the nozzle rows 9 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 Ober- seite ausbilden kann.The distance 11 between the last row of nozzles 7 on the upper side and the last row of nozzles 8 on the underside of the belt is to be determined in principle so that the cooling effect corresponds to that on the upper side 5 of the belt of the lower side 6. However, the distance 11 can be limited for constructional reasons, for example the space requirement of the scale washer, the arrangement of rollers or pipes. For this reason, the cooling of the underside 6 of the band is supported by the nozzle rows 9 with low pressure. Finally, an excessively large distance 11 would be disadvantageous since, due to the longer path from the last row of nozzles 7 on the upper side 5 to the entry into the finishing train 1, an overall thicker scale layer can be formed on the upper side.
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 T0, Tu sowie die an den Arbeitswalzen gemessenen Momente Mwiu-3u. M ιo-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 V0i, VUj, und V0j, 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 angeord- net 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 V0j, VUj, und V0j, VUJ- der Düsenreiben 17, 17" und 18, 18' inner- halb der Fertigstraße erforderlich:The effectiveness of the cooling due to 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 0 , T u measured by the pyrometers 12 and 12 'as well as the moments M w iu 3 u measured on the work rolls. M ιo-3o flow as a control variable into a computer-aided control circuit which, as the control variable, is applied via the nozzle rows 9 Amount of water V z or the amount of water V 0 i, V U j, and V 0 j, V Uj used in the street of the rows of nozzles 17, 17 'and 18, 18' is influenced by the desired symmetrical temperature distribution on the top and bottom 5 , 6 of the tape or to influence the moment 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 internal for determining the amount of water required for additional cooling via the nozzle rows 9 or for trimming the amounts of water V 0 j, V U j, and V 0 j, V UJ - of the nozzle graters 17, 17 "and 18, 18 ' - required halfway through the finishing train:
Die Einzugsgeschwindigkeit des Bandes vor der Fertigstraße 1 ändert sich abhängig von der Fertigbanddicke und dem BandmaterialThe feed speed of the strip in front of the finishing train 1 changes depending on the finished strip thickness and the strip material
die Düsen in den Düsenreihen 7, 8 unterliegen einem Verschleiß, so daß sich die Wassermenge im Laufe der Zeit ändertthe nozzles in the nozzle rows 7, 8 are subject to wear, so that the amount of water changes over time
das Druckniveau im Versorgungsnetz der Düsenreihen 7 schwankt,the pressure level in the supply network of the nozzle rows 7 fluctuates,
unterschiedliche Breiten des Bandes 4 beeinflussen das Ablaufen des auf der Oberseite 5 des Bandes 4 stehenden Wassers.Different widths of the belt 4 influence the running of the water standing on the top 5 of the belt 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, but without rows of nozzles 9 for low pressure water. In this exemplary embodiment, the symmetrical temperature distribution on the upper and lower sides 5, 6 of the band 4 is achieved only by the arrangement of the last rows of nozzles 7 in the running direction 2 offset at the distance 11. It can also be seen from FIG. 2 that so-called water collecting channels 17 are located on the top 5 of the belt 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. FIG. 3 finally shows a scale washer 3, in which the band 4 is exposed to water at a lower pressure with a row of nozzles 9 in front and two rows of nozzles 9 behind the last row of nozzles 7 on the underside of the band, to which water is subjected to descaling pressure ,
BezugszeichenlisteLIST OF REFERENCE NUMBERS
1. Fertigstraße1st finishing train
2. Laufrichtung des Bandes2. Running direction of the belt
3. Zunderwäscher3. Tinder washer
4. Band 5. Oberseite4. Volume 5. Top
6. Unterseite6. Bottom
7. Düsenreihen (Entzunderungsdruck)7. Nozzle rows (descaling pressure)
8. Düsenreihen (Entzunderungsdruck)8. Nozzle rows (descaling pressure)
9. Düsenreihe (Niederdruck) 10. Abstand y9. Row of nozzles (low pressure) 10. Distance y
11. Abstand x11. Distance x
12., 12' Pyrometer12th, 12 'pyrometer
13. Meßpunkte13. Measuring points
14. Rechner 15. Anlagedaten14. Computer 15. System data
16. Düsenreihen innerhalb der Fertigstraße16. Row of nozzles within the finishing train
17., 17' Düsenreihen innerhalb der Fertigstraße17th, 17 'rows of nozzles within the finishing train
18., 18' Düsenreihen innerhalb der Fertigstraße 18th, 18th row of nozzles within the finishing train

Claims

Patentansprüche claims
1. 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 auf der Ober- und Unterseite mit Wasser unter Entzunde- rungsdruck beaufschlagt sowie innerhalb der Fertigstraße gekühlt wird, dadurch gekennzeichnet, daß eine symmetrische Temperaturverteilung an der Ober- und Unterseite (5, 6) des Bandes (4) im Zunderwäscher (3) erzeugt und in gleicher Weise innerhalb der Fertigstraße aufrechtgehalten wird.1. A process for descaling strips in a rolling mill with a scale washer and a finishing train arranged behind the scale washer in the direction of travel of the strip, in which the belt in the scale washer pressurizes water on the top and bottom with descaling pressure and cools within the finishing train is characterized in that a symmetrical temperature distribution on the top and bottom (5, 6) of the belt (4) in the scale washer (3) is generated and maintained in the same way within the finishing train.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß das Band (4) im Zunderwäscher (3) an mehreren in Laufrichtung (2) hintereinander angeordneten Stellen (7, 8) mit Wasser unter Entzunde- rungsdruck beaufschlagt wird, wobei sich die in Laufrichtung letzte Stelle2. The method according to claim 1, characterized in that the band (4) in the scale washer (3) at several in the running direction (2) arranged one behind the other (7, 8) with water under descaling pressure is applied, the in the running direction last digit
(8) an der Unterseite (6) in einem Abstand (11) zu der letzten Stelle (7) an der Oberseite (5) und näher an der Fertigstraße (1) befindet.(8) on the underside (6) at a distance (11) to the last point (7) on the top (5) and closer to the finishing train (1).
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Unterseite (6) insgesamt mit einer größeren Wassermenge unter Entzunderungsdruck als die Oberseite (5) des Bandes (4) beaufschlagt wird.3. The method according to claim 1 or 2, characterized in that the bottom (6) is acted upon with a larger amount of water under descaling pressure than the top (5) of the belt (4).
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Unterseite (6) zusätzlich zu dem Wasser unter Entzunderungsdruck mit Wasser unter niedrigerem Druck im Bereich zwischen 4 und 10 bar beaufschlagt wird.4. The method according to any one of claims 1 to 3, characterized in that the bottom (6) in addition to the water under descaling pressure with water at a lower pressure in the range between 4 and 10 bar.
5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß die Beaufschlagung mit Wasser unter niedrigerem Druck in Laufrichtung (2) des Bandes (4) vor und /oder hinter der letzten Stelle (8) an der Unterseite (6) des Bandes (4) erfolgt, an der dieses mit Wasser unter Entzunderungsdruck beaufschlagt wird.5. The method according to claim 4, characterized in that the application of water at a lower pressure in the running direction (2) of the belt (4) before and / or behind the last point (8) on the underside (6) of the belt (4) at which it is pressurized with water under descaling pressure.
6. Verfahren nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß die Menge des unter Entzunderungsdruck und niedrigerem Druck auf das Band (4) aufgebrachten Wassers einstellbar ist.6. The method according to claim 4 or 5, characterized in that the amount of water applied under descaling pressure and lower pressure on the belt (4) is adjustable.
7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß berührungslos, insbesondere mit einem Pyrometer, die Temperaturen an der Ober- und Unterseite (5,6) des Bandes (4) in dessen Laufrichtung (2) hinter dem Zunderwäscher (3) und/oder die Walzmomente an mindestens einem Gerüst der Fertigstraße (1) oberhalb und unterhalb des Bandes (4) als Regelgröße eines Regelkreises gemessen werden und mittels einer Recheneinheit (1 4) die einstellbare Wassermenge als Stellgröße des Regelkreises verändert wird.7. The method according to claim 6, characterized in that non-contact, in particular with a pyrometer, the temperatures on the top and bottom (5,6) of the belt (4) in its running direction (2) behind the scale washer (3) and / or the rolling torques on at least one stand of the finishing train (1) above and below the strip (4) are measured as a control variable of a control loop and the adjustable water quantity is changed as a control variable of the control loop by means of a computing unit (1 4).
8. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß das Band (4) zumindest zwischen den ersten beiden Gerüsten F1 , F2 der Fertigstraße mit Wasser beaufschlagt wird, wobei die Unterseite (6) insgesamt mit einer größeren Wassermenge als die Oberseite (5) des8. The method according to any one of claims 1 to 8, characterized in that the belt (4) is acted upon at least between the first two stands F1, F2 of the finishing train with water, the bottom (6) overall with a larger amount of water than the top (5) of
Bandes (4) beaufschlagt wird. Verfahren nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß die oberen und unteren Balken zueinander versetzt angeordnet sind. Band (4) is applied. Method according to one of claims 1 to 9, characterized in that the upper and lower bars are arranged offset from one another.
EP02700270A 2001-03-03 2002-02-23 Method for removing scale from strips Expired - Lifetime EP1365870B1 (en)

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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

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EP1365870A1 true EP1365870A1 (en) 2003-12-03
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CN1269584C (en) 2006-08-16
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JP4136662B2 (en) 2008-08-20
RU2281174C2 (en) 2006-08-10

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