EP2344287A2 - Method and device for cooling a leader or band of a metal strand in a hot-rolling mill - Google Patents

Method and device for cooling a leader or band of a metal strand in a hot-rolling mill

Info

Publication number
EP2344287A2
EP2344287A2 EP09778628A EP09778628A EP2344287A2 EP 2344287 A2 EP2344287 A2 EP 2344287A2 EP 09778628 A EP09778628 A EP 09778628A EP 09778628 A EP09778628 A EP 09778628A EP 2344287 A2 EP2344287 A2 EP 2344287A2
Authority
EP
European Patent Office
Prior art keywords
strip
band
rolling mill
coolant
cooling
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
EP09778628A
Other languages
German (de)
French (fr)
Other versions
EP2344287B1 (en
Inventor
Jürgen Seidel
Uwe BAUMGÄRTEL
Andreas Wied
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 Siemag 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 Siemag AG filed Critical SMS Siemag AG
Publication of EP2344287A2 publication Critical patent/EP2344287A2/en
Application granted granted Critical
Publication of EP2344287B1 publication Critical patent/EP2344287B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • B21B37/44—Control of flatness or profile during rolling of strip, sheets or plates using heating, lubricating or water-spray cooling of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B15/0035—Forging or pressing devices as units
    • B21B15/005—Lubricating, cooling or heating means
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B39/02—Feeding or supporting work; Braking or tensioning arrangements, e.g. threading arrangements
    • B21B39/08—Braking or tensioning arrangements
    • B21B39/084—Looper devices

Definitions

  • the invention relates to a method and apparatus for cooling a pre-strip or strip of a metal strand in a work rolls having hot rolling mill, in which a coolant is sprayed onto the pre-strip or the tape.
  • cooling devices in the area of the roughing and finishing mill are known or defined, such as:
  • the pre-strip cooling (arrangement between the roughing stand and the first finishing stand)
  • the interstage cooling (arranged between two finishing stands)
  • the various cooling devices influence surface temperature control, scale growth, mechanical properties, production volume, etc.
  • the cooling effect is even over the bandwidth.
  • the pre-strip temperature and the strip temperature are colder in the entire finishing line in the strip edge region.
  • this effect is enhanced.
  • the new cooling method or cooling device will be described in more detail in the exemplary example of roll gap cooling.
  • a device of this kind is known from patent DE 4134599 C1. This is a method for hot rolling of metal strip with one or more stitches, wherein mainly on the inlet side of the rolling stand or the rolling stands, the pre-strip or the strip is cooled.
  • the known method is characterized in that the spraying of the cooling liquid on the feed side takes place in a region extending over the entire width of the metal strip as close as possible to the roll gap on the metal strip and on the shells of the work rolls such that the strip surface is supercooled and so a lower heat flow is created in the work roll.
  • the temperature of the pre-strip and the strip of a metal strip to be rolled in the strip edge region is lower than in the middle of the pre-strip or of the strip.
  • the temperature of a metal strip is shown as a function of the width of the metal strip passing through stands of a hot rolling mill. In this case, the band center of the metal strip is shown on the left edge of the diagram.
  • a curve 1 shows the course of the temperature before the shrinkage of the metal strip in a roll stand.
  • a curve 2 shows the temperature profile after exiting the mill stand. Both curves show the strong temperature drop in the edge area of the metal strip.
  • the temperature of the metal strip ie also of the pre-strip, in the Edge region is lower than in the middle, there is a different local load on the metal strip, which has a negative impact on both the work rolls and on the metal strip itself.
  • the affected areas of the work rolls may wear more severely, causing profile anomalies and / or flatness problems.
  • the cold strip edges can also adversely affect the metallurgical properties at the edge of the strip.
  • this object is achieved in that the pre-strip or the band is shielded in the region of the band edges of the application of the coolant.
  • a method is used, according to which the coolant is deflected in the region of the strip edges of the pre-strip or the strip, so that it does not hit the pre-band or the band in the area of the band edge.
  • the coolant is deflected in the region of the strip edges to areas outside of the pre-strip or of the strip, although in principle it is also possible to divert the coolant to the center of the strip.
  • the measures according to the invention are taken in the area of the inlet guide of the work rolls.
  • the invention also relates to a hot rolling mill with a roughing train and a finishing train for rolling a pre-strip or a strip of a metal strand by means of work rolls and with a cooling device for applying a coolant to the pre-strip or the band.
  • This is according to the invention characterized in that means for shielding the strip edges of the pre-strip, the thin slab or the strip are provided by the action ofmémitteis.
  • the means are arranged in the region of side guides of the pre-strip or of the band.
  • the side guides are in particular arranged in each case in front of an inlet gap formed in each case by two work rolls.
  • the means for shielding the band edges are respectively attached to the side guides, in particular as separate components. They can advantageously be moved together with the side guides transversely to the web running direction of the pre-band or the band.
  • the shielding means also advantageously provide for directing the coolant away from the pre-strip or belt.
  • the shielding means can also be arranged in the area behind a loop lifter (looper) on the underside of the pre-strip or the band.
  • 2a is a sectional view of a rolling mill passing through a metal strip in the region between two chilled beams transversely to the direction with side guides and facilities in the side region of the metal strip to shield the coolant from the edge portions of the metal strip in front of the inlet gap of two work rolls
  • Fig. 2b is a plan view of the metal strip according to 2a and additionally a shielding device for shielding the coolant, which is arranged in front of the inlet side guide
  • Fig. 3 is a sectional view of the metal strip and a side guide along a line III - III of Fig. 2a and in addition the cross section of the attached before the side guide shield.
  • a preliminary strip and a strip 4 (FIGS. 2 a, 3) of a metal strand to be rolled pass through a pair of work rolls 6, 7 in the area in front of the work rolls 6, 7 at the side edges of the strip 4 side guides 8, 9 attached, which are approximately U-shaped in cross-section and overlap the band 4 on the top and bottom in its edge region.
  • cooling bars 10, 11 cooling devices from the nozzles 12 On the top and bottom of the belt 4 are provided as cooling bars 10, 11 cooling devices from the nozzles 12, a coolant, in particular water, is sprayed under pressure on the surface of the belt 4 to cool this.
  • the nozzles 12 generate on the surface of the belt 4 impact areas 13 of the coolant.
  • shielding devices 14, 15 are provided which prevent cooling medium from the nozzles 12 'in the edge region of the belt 4 from being irradiated directly onto the edge region of the belt 4.
  • the Ablevoriquese ⁇ 14, 15 deflect the coolant jet in each case preferably in an area laterally outside the belt 4.
  • the upper-side shielding device 14 therefore comprises on both sides of the band 4 to the outside of the band 4 downwardly inclined plates 16 and 17.
  • plates 18, 19 of the shielding device 15 may also be flat, relative to the plane formed by the band 4, since the coolant is already deflected downwards due to gravity.
  • the shielding devices 14, 15 and 16, 18 can be attached to the guides 8, 9 as separate components, or the shielding devices 14, 15 and 16, 18 are fixed components of the guides 8, 9.
  • the guides 8, 9 according to the width of the strip 4 to be rolled transversely to the direction of the tape 4 in the direction of double arrows A, B are displaced, then the shielding devices 14, 15 and 16, 18 are moved accordingly.
  • the plates 18, 19 are tiltable to adjust the impact area of the shielded coolant jet.
  • a shielding device 20 can also be arranged in front of the side guide 8, 9 on the underside of the belt 4, which additionally in Fig. 2b 3 is shown.
  • the shielding device 20 is basically constructed like the shielding devices 14, 15 and 16, 18 and also includes like these plates 21 for deflecting the coolant flowing from nozzles 22 of a cooling bar 23.
  • the invention is applicable regardless of whether the coolant flows from individual nozzles or is irradiated in the form of a curtain on the belt 4, which has a the width of the belt 4 over-extending rectangular nozzle opening.
  • the coolant flows from individual nozzles or is irradiated in the form of a curtain on the belt 4, which has a the width of the belt 4 over-extending rectangular nozzle opening.
  • other media such as liquid nitrogen or water-air mixtures can be used as the coolant.
  • the device shown in the figures for edge shielding the band 4 can be used at various points within the finishing train especially in case of pre-strip cooling or interstage cooling. In this case, separate adjustment mechanisms for moving and adapting the shielding elements to the bandwidth can be used.

Abstract

The invention relates to a hot-rolling mill for cooling a leader or band (4) of a metal strand in a working roll (6, 7), in which a coolant is sprayed on the leader or the band (4), is characterized in that the leader or band (4) is shielded from contact by the coolant in the area of the band edges. Shielding devices (14, 15) are used for said purpose. A shielding device (20) can also be disposed in the area of a loop lifter, or in a cooler device between the pretreater and the final line.

Description

Verfahren und Vorrichtung zum Kühlen eines Vorbandes oder Bandes eines Metahstrangs in einem Warmwalzwerk Method and apparatus for cooling a pre-strip or strip of a metah string in a hot rolling mill
Die Erfindung bezieht sich auf ein Verfahren und eine Vorrichtung zum Kühlen eines Vorbandes oder Bandes eines Metallstrangs in einem Arbeitswalzen aufweisenden Warmwalzwerk, bei dem ein Kühlmittel auf das Vorband bzw. das Band aufgesprüht wird.The invention relates to a method and apparatus for cooling a pre-strip or strip of a metal strand in a work rolls having hot rolling mill, in which a coolant is sprayed onto the pre-strip or the tape.
In einem Warmwalzwerk sind mehrere Kühleinrichtungen im Bereich der Vor- und Fertigstraße bekannt bzw. definiert, wie:In a hot rolling mill, several cooling devices in the area of the roughing and finishing mill are known or defined, such as:
- die Vorbandkühlung (Anordnung zwischen Vorgerüst und erstem Fertiggerüst) - die Zwischengerüstkühlung (zwischen zwei Fertiggerüsten angeordnet)- the pre-strip cooling (arrangement between the roughing stand and the first finishing stand) - the interstage cooling (arranged between two finishing stands)
- die Bandunterseitenkühlung (vor einer Seitenführung bzw. hinter einem Schiingenheber positioniert)- the belt underside cooling (positioned in front of a side guide or behind a loop lifter)
- Walzspaltkühlung (beidseitige oder einseitige Kühlung des Bandes kurz vor dem Walzspalt).- Roll nip cooling (both-sided or one-sided cooling of the strip just before the nip).
Mit den verschiedenen Kühleinrichtungen wird die Oberflächentemperaturfüh- rung, Zunderwachstum, mechanische Eigenschaften, Produktionsmenge etc. beeinflusst. Die Kühlwirkung erfolgt gleichmäßig über der Bandbreite. In der Regel sind die Vorbandtemperatur sowie die Bandtemperatur in der gesamten Fertigstraße im Bandkantenbereich kälter. Durch die oben genannten Kühleinrichtungen wird dieser Effekt noch verstärkt. Durch Einsatz des in der Erfindung dargestellten Verfahrens und Vorrichtungen soll dieser Nachteil vermieden und die Temperaturgleichmäßigkeit sogar verbessert werden. An dem exemplari- sehen Beispiel Walzspaltkühlung wird das neue Kühlverfahren bzw. Kühleinrichtung näher beschrieben. Eine Einrichtung dieser Art ist aus dem Patent DE 4134599 C1 bekannt. Hier handelt es sich um ein Verfahren zum Warmwalzen von Metallband mit einem oder mehreren Stichen, wobei vornehmlich auf der Zulaufseite des Walzgerüstes oder der Walzgerüste das Vorband bzw. das Band gekühlt wird.The various cooling devices influence surface temperature control, scale growth, mechanical properties, production volume, etc. The cooling effect is even over the bandwidth. As a rule, the pre-strip temperature and the strip temperature are colder in the entire finishing line in the strip edge region. By the above-mentioned cooling devices, this effect is enhanced. By using the method and apparatuses shown in the invention, this disadvantage is to be avoided and the temperature uniformity even improved. The new cooling method or cooling device will be described in more detail in the exemplary example of roll gap cooling. A device of this kind is known from patent DE 4134599 C1. This is a method for hot rolling of metal strip with one or more stitches, wherein mainly on the inlet side of the rolling stand or the rolling stands, the pre-strip or the strip is cooled.
Das bekannte Verfahren ist dadurch gekennzeichnet, dass das Aufsprühen der Kühlflüssigkeit auf der Zulaufseite in einem sich über die gesamte Breite des Metallbandes möglichst nahe vor dem Walzspalt erstreckenden Bereichs auf das Metallband und auf die Mäntel der Arbeitswalzen derart erfolgt, dass die Bandoberfläche unterkühlt wird und so ein geringerer Wärmefluss in die Arbeitswalze entsteht.The known method is characterized in that the spraying of the cooling liquid on the feed side takes place in a region extending over the entire width of the metal strip as close as possible to the roll gap on the metal strip and on the shells of the work rolls such that the strip surface is supercooled and so a lower heat flow is created in the work roll.
Dieser Vorgehensweise liegt die Erkenntnis zugrunde, dass sich durch Kühlung der Bandoberfläche eines Stahlbandes unmittelbar vor dem Einlaufen in einen von zwei Walzen gebildeten Walzenspalt die Standzeit der Walzenoberfläche in den vorderen Gerüsten einer Warmbandstraße eines Walzwerks in erheblichem Umfang verlängert. Durch diese Maßnahme wird ein „Schälen" der Arbeitswalzen, d. h. ein Lösen der Oxidschicht von der Manteloberfläche der Arbeitswalzen, weitgehend vermieden oder wesentlich herausgezögert. Dies wirkt sich indirekt auch positiv auf die Qualität der Bandoberfläche aus.This approach is based on the finding that, by cooling the strip surface of a steel strip immediately before entering a nip formed by two rolls, the service life of the roll surface in the front stands of a hot strip mill of a rolling mill is extended to a considerable extent. As a result of this measure, "peeling" of the work rolls, that is to say loosening of the oxide layer from the mantle surface of the work rolls, is largely avoided or significantly delayed, which also has an indirect positive effect on the quality of the strip surface.
In der Regel ist die Temperatur des Vorbandes sowie des Bandes eines zu walzenden Metallbandes im Bandkantenbereich niedriger als in der Mitte des Vorbandes bzw. des Bandes. In Fig. 1 ist die Temperatur eines Metallbandes als Funktion der Breite des Metallbandes dargestellt, das Walzgerüste eines Warmwalzwerks durchläuft. Dabei ist am linken Rand des Diagramms die Bandmitte des Metallbandes dargestellt. Eine Kurve 1 zeigt den Verlauf der Temperatur vor dem Einlaufen des Metallbandes in ein Walzgerüst. Eine Kurve 2 zeigt den Temperaturverlauf nach dem Austritt aus dem Walzgerüst. In beiden Kurven ist der starke Temperaturabfall im Kantenbereich des Metallbandes erkennbar. Dadurch, dass die Temperatur des Metallbandes, d. h. auch des Vorbandes, im Kantenbereich geringer ist als in der Mitte, kommt es zu einer unterschiedlichen örtlichen Belastung des Metallbandes, die sich sowohl auf die Arbeitswalzen als auch auf das Metallband selber negativ auswirkt. Die betroffenen Bereiche der Arbeitswalzen verschleißen unter Umständen stärker, so dass Profilanomalien und/oder Bandplanheitsprobleme entstehen. Die kalten Bandkanten können sich auch negativ auf die metallurgischen Eigenschaften an der Kante des Bandes auswirken.In general, the temperature of the pre-strip and the strip of a metal strip to be rolled in the strip edge region is lower than in the middle of the pre-strip or of the strip. In Fig. 1, the temperature of a metal strip is shown as a function of the width of the metal strip passing through stands of a hot rolling mill. In this case, the band center of the metal strip is shown on the left edge of the diagram. A curve 1 shows the course of the temperature before the shrinkage of the metal strip in a roll stand. A curve 2 shows the temperature profile after exiting the mill stand. Both curves show the strong temperature drop in the edge area of the metal strip. Due to the fact that the temperature of the metal strip, ie also of the pre-strip, in the Edge region is lower than in the middle, there is a different local load on the metal strip, which has a negative impact on both the work rolls and on the metal strip itself. The affected areas of the work rolls may wear more severely, causing profile anomalies and / or flatness problems. The cold strip edges can also adversely affect the metallurgical properties at the edge of the strip.
Der Einsatz eines aus dem Stand der Technik bekannten Verfahrens zur Bandkühlung vor dem Walzenspalt kann die Temperaturdifferenz des Bandes zur Kante hin und damit die negativen Effekte noch vergrößern.The use of a known from the prior art method for strip cooling in front of the nip can increase the temperature difference of the tape towards the edge and thus the negative effects even more.
Ähnliche Effekte treten auch bei den anderen eingangs genannten Kühleinrichtungen auf.Similar effects also occur in the other cooling devices mentioned above.
Es ist die Aufgabe der Erfindung, ein Verfahren zum Warmwalzen eines Metall- bandes zu schaffen, bei dem ein gleichmäßigerer Verlauf der Temperatur über das Querprofil erreicht wird ohne die Bandkante mit z. B. Kantenheizungen zu erhitzen.It is the object of the invention to provide a method for hot rolling a metal strip, in which a more uniform course of the temperature over the transverse profile is achieved without the band edge with z. B. heating edge heating.
Bei einem Verfahren der eingangs genannten Art wird diese Aufgabe dadurch gelöst, dass das Vorband bzw. das Band im Bereich der Bandkanten von der Beaufschlagung durch das Kühlmittel abgeschirmt wird.In a method of the type mentioned, this object is achieved in that the pre-strip or the band is shielded in the region of the band edges of the application of the coolant.
Durch die erfindungsgemäße aktive Walzspaltkühlung stellt sich ein homogener Temperaturverlauf gemäß Kurve 3 in Figur 1 ein und verbessert somit die Bandeigenschaften sowie den Walzenverschleiß.As a result of the active nip cooling according to the invention, a homogeneous temperature profile according to curve 3 in FIG. 1 is established and thus improves the strip properties and the roll wear.
Vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen.Advantageous developments of the invention will become apparent from the dependent claims.
Vorzugsweise wird ein Verfahren eingesetzt, gemäß dem das Kühlmittel im Bereich der Bandkanten des Vorbandes bzw. des Bandes abgelenkt wird, so dass es nicht auf das Vorband bzw. das Band im Bereich der Bandkante auftrifft. Bevorzugt wird das Kühlmittel im Bereich der Bandkanten auf Bereiche außerhalb des Vorbandes bzw. des Bandes abgelenkt, obwohl es prinzipiell auch möglich ist, das Kühlmittel zur Bandmitte abzulenken. Vorzugsweise werden die erfindungsgemäßen Maßnahmen im Bereich der Einlaufführung der Arbeitswalzen ergriffen.Preferably, a method is used, according to which the coolant is deflected in the region of the strip edges of the pre-strip or the strip, so that it does not hit the pre-band or the band in the area of the band edge. Preferably, the coolant is deflected in the region of the strip edges to areas outside of the pre-strip or of the strip, although in principle it is also possible to divert the coolant to the center of the strip. Preferably, the measures according to the invention are taken in the area of the inlet guide of the work rolls.
Die Erfindung bezieht sich auch auf ein Warmwalzwerk mit einer Vorstraße und einer Fertigstraße zum Walzen eines Vorbandes bzw. eines Bandes eines Metallstrangs mittels Arbeitswalzen und mit einer Kühlvorrichtung zum Aufbringen eines Kühlmittels auf das Vorband bzw. das Band.The invention also relates to a hot rolling mill with a roughing train and a finishing train for rolling a pre-strip or a strip of a metal strand by means of work rolls and with a cooling device for applying a coolant to the pre-strip or the band.
Dieses ist erfindungsgemäß dadurch gekennzeichnet, dass Mittel zur Abschirmung der Bandkanten des Vorbandes, der Dünnbramme bzw. des Bandes von der Einwirkung des Kühlmitteis vorgesehen sind. Vorzugsweise sind die Mittel im Bereich von Seitenführungen des Vorbandes bzw. des Bandes angeordnet.This is according to the invention characterized in that means for shielding the strip edges of the pre-strip, the thin slab or the strip are provided by the action of Kühlmitteis. Preferably, the means are arranged in the region of side guides of the pre-strip or of the band.
Die Seitenführungen sind insbesondere jeweils vor einem jeweils von zwei Arbeitswalzen gebildeten Einlaufspalt angeordnet. Dabei sind die Mittel zur Abschirmung der Bandkanten jeweils an den Seitenführungen, insbesondere als separate Bauelemente, befestigt. Sie lassen sich mit Vorteil zusammen mit den Seitenführungen quer zur Bahnlaufrichtung des Vorbandes bzw. des Bandes verfahren. Die Abschirmmittel sorgen ferner mit Vorteil dafür, dass das Kühlmittel von dem Vorband bzw. dem Band weg nach außen gelenkt wird.The side guides are in particular arranged in each case in front of an inlet gap formed in each case by two work rolls. In this case, the means for shielding the band edges are respectively attached to the side guides, in particular as separate components. They can advantageously be moved together with the side guides transversely to the web running direction of the pre-band or the band. The shielding means also advantageously provide for directing the coolant away from the pre-strip or belt.
Die Abschirmmittel können ebenso auch im Bereich hinter einem Schlingenhe- ber (Looper) auf der Unterseite des Vorbandes bzw. des Bandes angeordnet sein.The shielding means can also be arranged in the area behind a loop lifter (looper) on the underside of the pre-strip or the band.
Nachstehend wird die Erfindung in Ausführungsbeispielen näher erläutert. Es zeigen: Fig. 2a eine Schnittansicht eines ein Walzgerüst durchlaufenden Metallbandes im Bereich zwischen zwei Kühlbalken quer zur Laufrichtung mit Seitenführungen und Einrichtungen im Seitenbereich des Metallbandes zur Abschirmung des Kühlmittels von den Kantenbereichen des Metallbandes vor dem Einlaufspalt zweier Arbeitswalzen, Fig. 2b eine Draufsicht auf das Metallband gemäß einer Linie Il - Il aus Fig. 2a und zusätzlich eine Abschirmvorrichtung zur Abschirmung des Kühlmittels, die vor der Einlauf-Seitenführung angeordnet ist, und Fig. 3 eine Schnittansicht des Metallbandes und einer Seitenführung gemäß einer Linie III - III aus Fig. 2a sowie zusätzlich den Querschnitt der vor der Seitenführung angebrachten Abschirmvorrichtung.The invention will be explained in more detail in exemplary embodiments. Show it: 2a is a sectional view of a rolling mill passing through a metal strip in the region between two chilled beams transversely to the direction with side guides and facilities in the side region of the metal strip to shield the coolant from the edge portions of the metal strip in front of the inlet gap of two work rolls, Fig. 2b is a plan view of the metal strip according to 2a and additionally a shielding device for shielding the coolant, which is arranged in front of the inlet side guide, and Fig. 3 is a sectional view of the metal strip and a side guide along a line III - III of Fig. 2a and in addition the cross section of the attached before the side guide shield.
In einem eine Mehrzahl von Walzgerüsten aufweisenden Walzwerk durchlaufen ein Vorband und ein Band 4 (Fig. 2a, 3) eines zu walzenden Metallstrangs WalzspaJte 5 zwischen jeweils zwei Arbeitswalzen 6, 7. Im Bereich vor den Arbeitswalzen 6, 7 sind an den Seitenkanten des Bandes 4 seitliche Führungen 8, 9 angebracht, die die im Querschnitt etwa U-förmig ausgebildet sind und das Band 4 auf der Oberseite und Unterseite in dessen Kantenbereich übergreifen.In a rolling mill having a plurality of rolling mills, a preliminary strip and a strip 4 (FIGS. 2 a, 3) of a metal strand to be rolled pass through a pair of work rolls 6, 7 in the area in front of the work rolls 6, 7 at the side edges of the strip 4 side guides 8, 9 attached, which are approximately U-shaped in cross-section and overlap the band 4 on the top and bottom in its edge region.
Auf der Ober- und Unterseite des Bandes 4 sind als Kühlbalken 10, 11 Kühlvorrichtungen vorgesehen, aus deren Düsen 12 ein Kühlmittel, insbesondere Wasser, unter Druck auf die Oberfläche des Bandes 4 aufgesprüht wird, um dieses zu kühlen. Die Düsen 12 erzeugen dabei auf der Oberfläche des Bandes 4 Aufschlagbereiche 13 des Kühlmittels. Erfindungsgemäß sind Abschirmvorrichtun- gen 14, 15 vorhanden, die verhindern, dass aus den Düsen 12' im Kantenbereich des Bandes 4 Kühlmedium unmittelbar auf den Kantenbereich des Bandes 4 gestrahlt wird. Die Abschirmvorrichtungeπ 14, 15 lenken den Kühlmittelstrahl jeweils bevorzugt in einen Bereich seitlich außerhalb des Bandes 4 um.On the top and bottom of the belt 4 are provided as cooling bars 10, 11 cooling devices from the nozzles 12, a coolant, in particular water, is sprayed under pressure on the surface of the belt 4 to cool this. The nozzles 12 generate on the surface of the belt 4 impact areas 13 of the coolant. According to the invention, shielding devices 14, 15 are provided which prevent cooling medium from the nozzles 12 'in the edge region of the belt 4 from being irradiated directly onto the edge region of the belt 4. The Abschirmvorrichtungeπ 14, 15 deflect the coolant jet in each case preferably in an area laterally outside the belt 4.
Insbesondere die oberseitige Abschirmvorrichtung 14 umfasst daher an beiden Seiten des Bandes 4 zur Außenseite des Bandes 4 nach unten geneigte Platten 16 und 17. Auf der Unterseite des Bandes 4 können Platten 18, 19 der Abschirmvorrichtung 15 auch eben, bezogen auf die von dem Band 4 gebildete Ebene, verlaufen, da das Kühlmittel bereits aufgrund der Schwerkraft nach unten abgelenkt wird.In particular, the upper-side shielding device 14 therefore comprises on both sides of the band 4 to the outside of the band 4 downwardly inclined plates 16 and 17. On the underside of the band 4, plates 18, 19 of the shielding device 15 may also be flat, relative to the plane formed by the band 4, since the coolant is already deflected downwards due to gravity.
Vorzugsweise lassen sich die Abschirmvorrichtungen 14, 15 bzw. 16, 18 an den Führungen 8, 9 als gesonderte Bauteile befestigen, oder die Abschirmvorrichtungen 14, 15 bzw. 16, 18 sind feste Bestandteile der Führungen 8, 9. Wenn die Führungen 8, 9 entsprechend der Breite des zu walzenden Bandes 4 quer zur Laufrichtung des Bandes 4 in Richtung von Doppelpfeilen A, B verschiebbar sind, werden dann die Abschirmvorrichtungen 14, 15 bzw. 16, 18 entsprechend mitverschoben. Es lässt sich auch vorsehen, dass die Platten 18, 19 verkippbar bzw. schräg sind, um den Auftreffbereich des abgeschirmten Kühlmittelstrahls einzustellen.Preferably, the shielding devices 14, 15 and 16, 18 can be attached to the guides 8, 9 as separate components, or the shielding devices 14, 15 and 16, 18 are fixed components of the guides 8, 9. When the guides 8, 9 according to the width of the strip 4 to be rolled transversely to the direction of the tape 4 in the direction of double arrows A, B are displaced, then the shielding devices 14, 15 and 16, 18 are moved accordingly. It can also be provided that the plates 18, 19 are tiltable to adjust the impact area of the shielded coolant jet.
Zusätzlich zur Anordnung der Abschirmvorrichtungen 14, 15 bzw. 16, 18 im Bereich vor den Walzenspalten 5 zwischen Arbeitswalzen 6, 7 lässt sich eine Abschirmvorrichtung 20 auch vor der Seitenführung 8, 9 auf der Unterseite des Bandes 4 anordnen, was zusätzlich in Fig. 2b, 3 dargestellt ist. Die Abschirmvorrichtung 20 ist prinzipiell aufgebaut wie die Abschirmvorrichtungen 14, 15 bzw. 16, 18 und umfasst ebenfalls wie diese Platten 21 zum Umlenken des Kühlmittels, das aus Düsen 22 eines Kühlbalkens 23 strömt.In addition to the arrangement of the shielding devices 14, 15 and 16, 18 in the area in front of the nips 5 between work rolls 6, 7, a shielding device 20 can also be arranged in front of the side guide 8, 9 on the underside of the belt 4, which additionally in Fig. 2b 3 is shown. The shielding device 20 is basically constructed like the shielding devices 14, 15 and 16, 18 and also includes like these plates 21 for deflecting the coolant flowing from nozzles 22 of a cooling bar 23.
Es versteht sich, dass die Erfindung unabhängig davon einsetzbar ist, ob das Kühlmittel aus einzelnen Düsen strömt oder in Form eines Vorhangs auf das Band 4 eingestrahlt wird, der eine die Breite des Bandes 4 überstreckende rechteckige Düsenöffnung aufweist. Als Kühlmittel können außer Wasser auch andere Medien wie flüssiger Stickstoff oder Wasser-Luft-Gemische eingesetzt werden.It is understood that the invention is applicable regardless of whether the coolant flows from individual nozzles or is irradiated in the form of a curtain on the belt 4, which has a the width of the belt 4 over-extending rectangular nozzle opening. Apart from water, other media such as liquid nitrogen or water-air mixtures can be used as the coolant.
Die anhand der Figuren dargestellte Einrichtung zur Kantenabschirmung des Bandes 4 kann innerhalb der Fertigstraße an verschiedenen Stellen eingesetzt werden, insbesondere auch bei einer Vorbandkühlung oder einer Zwischenge- rüstkühlung. Hierbei können separate Verstellmechanismen zur Bewegung und Anpassung der Abschirmelemente an die Bandbreite zum Einsatz kommen. The device shown in the figures for edge shielding the band 4 can be used at various points within the finishing train especially in case of pre-strip cooling or interstage cooling. In this case, separate adjustment mechanisms for moving and adapting the shielding elements to the bandwidth can be used.

Claims

Patentansprüche claims
1. Verfahren zum Kühlen eines Vorbandes oder Bandes (4) eines Metallstrangs in einem Arbeitswalzen (6, 7) aufweisenden Warm walz werk, bei dem ein Kühlmittel auf das Vorband bzw. das Band (4) aufgesprüht wird, dadurch gekennzeichnet, dass das Vorband bzw. das Band (4) im Bereich der Bandkanten von der Beaufschlagung durch das Kühlmittel abgeschirmt wird.1. A method for cooling a pre-strip or strip (4) of a metal strand in a work rolls (6, 7) having hot rolling factory, in which a coolant to the pre-strip or the band (4) is sprayed, characterized in that the pre-strip or the band (4) is shielded in the region of the band edges from the application of the coolant.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass das Kühlmittel im Bereich der Bandkanten des Vorbandes bzw. des Bandes (4) abgelenkt wird und nicht auf das Vorband bzw. das Band (4) im Bereich der Bandkante auftrifft.2. The method according to claim 1, characterized in that the coolant is deflected in the region of the strip edges of the pre-strip or of the strip (4) and does not impinge on the pre-strip or the strip (4) in the region of the strip edge.
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass das Kühlmittel im Bereich der Bandkanten auf Bereiche außerhalb des Vorbandes bzw. des Bandes (4) abgelenkt wird.3. The method according to claim 2, characterized in that the coolant is deflected in the region of the band edges on areas outside of the pre-strip or the band (4).
4. Verfahren nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass das Kühlmittel im Bereich der Einlaufführung einer Arbeitswalze (6,4. The method according to claim 2 or 3, characterized in that the coolant in the region of the inlet guide of a work roll (6,
7) von den Bandkanten abgelenkt wird.7) is deflected from the strip edges.
5. Warmwalzwerk mit einer Vorstraße und einer Fertigstraße zum Walzen eines Vorbandes bzw. eines Bandes (4) eines Metallstrangs mittels Ar- beitswalzen (6, 7) und mit einer Kühlvorrichtung (10, 11 ) zum Aufbringen eines Kühlmittels auf das Vorband bzw. das Band (4), dadurch gekennzeichnet, dass Mitte) (14, 15; 20) zur Abschirmung der Bandkanten des Vorbandes bzw. des Bandes (4) von der Einwirkung des Kühlmittels vorgesehen sind.5. hot rolling mill with a roughing train and a finishing train for rolling a Vorbandes or a strip (4) of a metal strand by means of work- (6, 7) and with a cooling device (10, 11) for applying a coolant to the pre-strip or the Volume (4), characterized in that center (14, 15, 20) for shielding the strip edges of the pre-strip or the strip (4) from the action of the coolant are provided.
6. Walzwerk nach Anspruch 5, dadurch gekennzeichnet, dass die Mittel (14, 15; 20) im Bereich von Seitenführungen (8, 9) des Vorbandes bzw. des Bandes (4) angeordnet sind.6. rolling mill according to claim 5, characterized in that the means (14, 15, 20) in the region of side guides (8, 9) of the pre-strip or the band (4) are arranged.
7. Walzwerk nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass die Seitenführungen (8, 9) jeweils vor einem jeweils von zwei Arbeitswalzen (6, 7) gebildeten Einlaufspalt (5) angeordnet sind.7. Rolling mill according to claim 5 or 6, characterized in that the side guides (8, 9) in each case in front of a respective two work rolls (6, 7) formed inlet gap (5) are arranged.
8. Walzwerk nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass die Mittel (14, 15; 20) jeweils an den Seitenführungen (8, 9), insbesondere als separate Bauelemente, befestigt sind.8. Rolling mill according to claim 6 or 7, characterized in that the means (14, 15, 20) in each case on the side guides (8, 9), in particular as separate components, are attached.
9. Walzwerk nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, dass die Mittel (14, 15; 20) zusammen mit den Seitenführungen (8, 9) quer zur Bahnlaufrichtung des Vorbandes bzw. des Bandes (4) verfahrbar sind.9. Rolling mill according to one of claims 6 to 8, characterized in that the means (14, 15, 20) together with the side guides (8, 9) transversely to the web running direction of the pre-strip or the band (4) are movable.
10. Walzwerk nach einem der Ansprüche 5 bis 9, dadurch gekennzeichnet, dass die Mittel (14, 15; 20) das Kühlmittel von dem Vorband bzw. dem Band (4) weg nach außen lenken.10. Rolling mill according to one of claims 5 to 9, characterized in that the means (14, 15, 20) direct the coolant away from the pre-strip or the band (4).
11. Walzwerk nach Anspruch 5, dadurch gekennzeichnet, dass das Mittel (20) im Bereich hinter einem Schiingenheber (Looper) auf äer Unterseite des Vorbandes bzw. des Bandes (4) angeordnet ist.11. Rolling mill according to claim 5, characterized in that the means (20) is arranged in the area behind a loop lifter (looper) on the underside of the pre-strip or band (4).
12. Walzwerk nach einem der vorangegangenen Ansprüche, gekennzeichnet durch, ein Mittel zur Abschirmung der Bandkante im Bereich der Zwischengerüst- kühlung.12. Rolling mill according to one of the preceding claims, characterized by, a means for shielding the band edge in the region of the interstand cooling.
13. Walzwerk nach Anspruch 12, dadurch gekennzeichnet, dass das Mittel zur Abschirmung der Bandkante in einer Kühleinrichtung im Bereich zwischen Vorgerüst und erstem Fertiggerüst angeordnet ist.13. Rolling mill according to claim 12, characterized in that the means for shielding the band edge is arranged in a cooling device in the region between the roughing stand and the first finishing stand.
14. Walzwerk nach Anspruch 12 und 13, dadurch gekennzeichnet, dass das Abschirmmittel mit einer eigenen Breitenverstelleinrichtung versehen ist.14. Rolling mill according to claim 12 and 13, characterized in that the shielding means is provided with its own Breitenverstelleinrichtung.
15. Walzwerk nach Anspruch 14, dadurch gekennzeichnet, dass die Abschirmbreite unterschiedlich für die verschiedene Einrichtungen (Vorbandkühlung, Zwischengerüstkühlung, Walzspaltkühlung) einstellbar ist. 15. Rolling mill according to claim 14, characterized in that the Abschirmbreite different for the different facilities (Vorbandkühlung, interstate cooling, roll gap cooling) is adjustable.
EP09778628.9A 2008-09-30 2009-09-21 Method and device for cooling a leader or band of a metal strand in a hot-rolling mill Active EP2344287B1 (en)

Applications Claiming Priority (2)

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DE102008049537A DE102008049537A1 (en) 2008-09-30 2008-09-30 Method and apparatus for cooling a sliver or strip of a metal strand in a hot rolling mill
PCT/EP2009/006802 WO2010037481A2 (en) 2008-09-30 2009-09-21 Method and device for cooling a leader or band of a metal strand in a hot-rolling mill

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EP3002343A1 (en) * 2014-09-30 2016-04-06 Voestalpine Stahl GmbH Method for the manufacture of steel strip material having different mechanical properties across the width of the strip
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EP2344287B1 (en) 2013-11-06
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BRPI0919507A2 (en) 2018-02-14
DE102008049537A1 (en) 2010-04-01
RU2467815C1 (en) 2012-11-27
KR20110044317A (en) 2011-04-28
JP5554335B2 (en) 2014-07-23
US20110209515A1 (en) 2011-09-01
KR101279387B1 (en) 2013-07-04
CN102164688A (en) 2011-08-24
WO2010037481A2 (en) 2010-04-08
US9539629B2 (en) 2017-01-10
JP2012504052A (en) 2012-02-16
WO2010037481A3 (en) 2010-07-15
CA2738832A1 (en) 2010-04-08

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