EP3535071A1 - Method and system for producing a metal strip - Google Patents

Method and system for producing a metal strip

Info

Publication number
EP3535071A1
EP3535071A1 EP17787184.5A EP17787184A EP3535071A1 EP 3535071 A1 EP3535071 A1 EP 3535071A1 EP 17787184 A EP17787184 A EP 17787184A EP 3535071 A1 EP3535071 A1 EP 3535071A1
Authority
EP
European Patent Office
Prior art keywords
driver
strip
bending
conveying direction
tensile stress
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
EP17787184.5A
Other languages
German (de)
French (fr)
Other versions
EP3535071B1 (en
Inventor
Jürgen Seidel
Jens ARTEL
Bernhard Ehls
Hartmut Hof
Babak TALEB-ARAGHI
Christoph Klein
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Group GmbH
Original Assignee
SMS Group GmbH
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 Group GmbH filed Critical SMS Group GmbH
Publication of EP3535071A1 publication Critical patent/EP3535071A1/en
Application granted granted Critical
Publication of EP3535071B1 publication Critical patent/EP3535071B1/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
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
    • B21D1/05—Stretching combined with rolling
    • 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
    • B21B2015/0057—Coiling the rolled 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
    • B21B2015/0071—Levelling the rolled product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/20—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2263/00—Shape of product
    • B21B2263/04—Flatness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/02—Tension
    • B21B2265/08—Back or outlet tension

Definitions

  • the invention relates to a method for producing a metallic strip, wherein the strip is rolled in a rolling mill, wherein the strip is subjected to a bending straightening process in a bending straightener at a location downstream of the mill in the conveying direction and wherein the strip is at a location downstream of the bending straightener in the conveying direction is reeled on a reel. Furthermore, the invention relates to a system for producing a metallic strip.
  • the invention is therefore based on the object of providing a method and a system with which it is possible to increase the degree of flatness of the strip.
  • the solution to this problem by the invention is characterized in that the strip is held at least temporarily under a first tensile stress between the rolling mill and the bending stripper, that the strip is held in the conveying direction behind the bending stripper at least temporarily under a second tensile stress and that the Band is held at least temporarily under a third tensile stress in the region of the bending straightener, wherein the third tensile stress is greater than the first tensile stress and the second tensile stress.
  • the first tensile stress and the second tensile stress are preferably between 5 and 25 N / mm 2 .
  • the third tensile stress is preferably between 30 and 80 N / mm 2 , more preferably between 40 and 60 N / mm 2 . Excluded from said tension are the head and the end of the band.
  • the train level on the transport route before the bending straightener section and the transport route after the bending straightener section may be different.
  • the mean tension level within the drafting straightener section is preferably determined as a function of the strip material, the strip temperature within the straightening section and the strip thickness, and is preferably set and controlled using a process model.
  • the train level in the adjacent transport routes also defines a process model.
  • the train levels on the long transport route between the last active rolling stand and the first driver of the bending jig and the transport distance from the second driver of the bending jig and the reel driver or the reel is thus lower than the Switzerlandmony within the Bending trek judge distance. Accordingly, the trains are decoupled from the neighboring routes in the area of the bending stretcher route.
  • the tension in the belt is preferably influenced, controlled or regulated by a first driver and a second driver, wherein the first driver is arranged in the conveying direction before the bending straightener and the second driver in the conveying direction behind the bending straightener or the two drivers the extension of the bending straightener in the conveying direction limit (in the latter case, the two drivers are thus part of the bending straightener).
  • the different train levels are thus adjusted by the drivers in front of and behind the bending straightener.
  • a scissors driver or a reel driver instead of the second driver behind the Biegestreckrichter can also take over their task, a scissors driver or a reel driver. In this case, the increased third tensile stress is built up in the area of the bending straightener between the first driver and a reel driver.
  • the distance a then applies between the first driver and the reel driver.
  • the second driver is then opened or not installed.
  • the second tension is then only between reel driver and reel.
  • At least one further driver eg a scissors driver
  • the strip is preferably subjected to cooling in a cooling section between the rolling mill and the bending straightener.
  • cooling in the conveying direction behind the bending straightener no longer takes place.
  • the advantage of this type of cooling of the belt is that in this way the cooling section no longer influences the flatness of the belt.
  • the strip preferably has a temperature in its bending straightening process which is between 20 ° C and 750 ° C, more preferably between 200 ° C and 600 ° C. With the method mentioned, it is particularly advantageous to produce a hot strip having a thickness of between 0.5 mm and 2.5 mm.
  • the plant for producing a metallic strip comprises a rolling mill for rolling the strip, a rolling mill downstream of the rolling mill in the conveying direction of the strip and at least one downstream of the bending straightener in the conveying direction and provides according to the invention that the bending straightener arranged in the conveying direction at the front first driver and a in the conveying direction arranged behind the second driver, wherein the two drivers limit the extension of the bending straightener and wherein the distance in the conveying direction between the first driver and the second driver is at most 20 m. Preferably, the distance is at most 5 m. This minimizes the cycle time through the bending straightener and the associated constriction of the band due to the train.
  • a cooling section is preferably arranged; behind the bending straightener preferably no cooling track follows.
  • the bending straightener has a number of rollers for introducing a bending moment into the belt, wherein the diameter of the rollers is preferably at least 50 mm, particularly preferably at least 100 mm.
  • the bending straightener section comprises a bending straightener consisting of a number of rollers (for example 5 rollers) and / or a back bending unit consisting of further rollers (for example 3 rollers).
  • the driver may be in the classic design of successive two roles or be designed with an offset arrangement of the rollers to produce a wrap angle and optionally additional torque transmission.
  • the drafting strip rolls preferably have internal cooling and / or are externally cooled with stripper plates to shield the water from the strip to allow the strip to cool Reel temperature is not adversely affected.
  • the strip cooling in the bending straightener section is further taken into account and taken into account when determining the target strip temperature behind the cooling section, so that the desired coil temperature is generated.
  • the invention thus relates in particular to a hot bending stripper behind a hot strip mill.
  • the proposed solution thus provides an optimization of the Biegestreckrichter- arrangement and the Switzerlandverotti ready, resulting in the consequence to an improved degree of planarity of the produced strip.
  • a good flatness improvement by means of a bending straightening process results for a given strip material at high strip tension, high strip temperatures and small bending radii of the strip, d. H. with small straightening roll diameters.
  • Too small roll diameter are disadvantageous in terms of maintenance, service life or role wear. Too high a draft and / or too high strip temperatures will result in large width constrictions on the long stretch between the last mill stand of the hot strip mill and the reel. The width constriction due to strip tension is also dependent on the flatness state itself and thus difficult to determine. Furthermore, the cooling section also influences the flatness condition of the belt.
  • Fig. 1 shows a schematic side view of a system for producing a belt
  • Fig. 2 shows the course of the tensile stress in the band over the extension in the longitudinal direction of the plant.
  • FIG. 1 a plant for the production of a steel strip 1 is shown, of a rolling mill 2, only the last rolling mill is indicated, from which the belt 1 in the conveying direction F in the direction of a reel 4 expires (provided here are two reel 4). Between the rolling mill 2 and the reel 4, a bending straightener 3 is arranged, in which the band is directed by a bending straightening process.
  • the bending straightener 3 is limited by a first driver 5 and a second driver 6 in its extension in the conveying direction F, wherein there is a distance a between the two drivers 5, 6.
  • the bending straightener 3 has a number of rollers 8, which are designed to apply corresponding bending stress on the band 1 in a conventional manner.
  • a cooling section 7, which is arranged between the rolling mill 2 and the bending straightener 3 and with which the belt 1 can be cooled. Furthermore, some components are indicated in FIG. 1, which are relevant for carrying out the production process of the strip 1, namely a flatness measuring device 9, a temperature measuring device 10, a temperature measuring device 11, a pair of scissors 12 and a reel temperature measuring device 13.
  • the promotion of the belt 1 between the rolling mill 2 and the reel 4 results from the interaction of the last mill stand of the rolling mill, the first and the second driver 5, 6 and in the embodiment by a reel driver 14.
  • the tension in the band can be influenced.
  • first tensile stress ⁇ which is preferably in a range between 5 and 25 N / mm 2 .
  • a second tensile stress ⁇ 2 which is also preferably in a range between 5 and 25 N / mm 2 .
  • the two tensile stress ⁇ and ⁇ 2 must by no means be the same.
  • the tensile stress in the region of the bending straightener 3 is at a higher level.
  • the present here third tension ⁇ 3 is in a preferred range between 40 and 60 N / mm 2. It is advantageously provided that the distance a is relatively short and preferably extends only over about 5 m. As a result, the throughput time is low by the bending jig 3, resulting in only a small constriction of the band due to the train.
  • the scissors 12 is used in continuous rolling.
  • the bending straightening process is thereby significantly improved. This applies in particular if the process is operated with further parameters, as explained above.
  • the temperature control which is preferably chosen so that the band 1 in the region of the bending jig 3 has a temperature between 200 ° C and 600 ° C.

Abstract

The invention relates to a method for producing a metal strip (1), wherein the strip (1) is rolled in a rolling mill (2), wherein the strip (1) is subjected to a tension-levelling process in a tension-leveller (3) at a location after the rolling mill (2) in the conveying direction (F), and wherein the strip (1) is wound onto a reel (4) at a location after the tension-leveller (3) in the conveying direction (F). In order to increase the degree of flatness of the strip, according to the invention, the strip (1) is retained at least for a period of time under a first tensile stress (σ1) between the rolling mill (2) and the tension-leveller (3), the strip (1) is retained at least for a period of time under a second tensile stress (σ2) behind the tension-leveller (3) in the conveying direction (F), and the strip (1) is retained at least for a period of time under a third tensile stress (σ3) in the region of the tension-leveller (3), wherein the third tensile stress (σ3) is greater than the first tensile stress (σ1) and the second tensile stress (σ2). The invention also relates to a system for producing a metal strip.

Description

Verfahren und Anlage zur Herstellung eines metallischen Bandes  Method and plant for producing a metallic strip
Die Erfindung betrifft ein Verfahren zur Herstellung eines metallischen Bandes, wobei das Band in einem Walzwerk gewalzt wird, wobei das Band an einer dem Walzwerk in Förderrichtung nachgelagerten Stelle einem Biegestreckrichtprozess in einem Biegestreckrichter unterzogen wird und wobei das Band an einer dem Biegestreckrichter in Förderrichtung nachgelagerten Stelle auf einem Haspel aufgehaspelt wird. Des weiteren betrifft die Erfindung eine Anlage zur Herstellung eines metallischen Bandes. The invention relates to a method for producing a metallic strip, wherein the strip is rolled in a rolling mill, wherein the strip is subjected to a bending straightening process in a bending straightener at a location downstream of the mill in the conveying direction and wherein the strip is at a location downstream of the bending straightener in the conveying direction is reeled on a reel. Furthermore, the invention relates to a system for producing a metallic strip.
Die Anforderungen an die Kaltbandplanheit bei dünnen Warmbändern, die beispielsweise direkt verkauft werden, oder an die Warmbandplanheit von Warmbändern, die längere Zeit unter Zug endlos gewalzt und gewickelt werden und bei denen nur unzureichende Planheitsmessungen vorliegen, nehmen ständig zu. The requirements for cold strip flatness in thin hot strip, for example sold directly, or in the hot strip flatness of hot strip, which are rolled and wound endlessly for a long time under tension and in which there are only insufficient flatness measurements, are constantly increasing.
Zur Planheitsverbesserung wurden in der Vergangenheit Streckrichtmaschinen vorgeschlagen, die hinter Warmbandstraßen einsetzbar sind. Ein solcher Anwendungsfall für das Endloswalzen ist beispielsweise in der GB 2 163 689 A offenbart. Eine Anordnung von Streckrichtmaschinen vor einem Haspeltreiber oder zwischen Haspeltreiber und Haspel offenbaren die DE 2 537 188 A1 , die US 4 316 376 A, die EP 0 906 797 B1 , die DE 199 53 915 A1 , die EP 2 038 076 B1 und die EP 3 061 535 A1 . Ein Streckrichter unmittelbar hinter der Warmbandstraße wird in der US 4 539 830 A und innerhalb der Kühlstrecke in der DE 10 2013 214 344 A1 offenbart. Weitere Lösungen zeigen die DE 10 2005 060 046 B4 und die EP 1 230 993 B1 . To improve flatness, draft levelers have been proposed in the past that can be used behind hot strip mills. Such an application for endless rolling is disclosed, for example, in GB 2 163 689 A. An arrangement of stretch levelers in front of a reel driver or between reel driver and reel disclose DE 2 537 188 A1, US 4,316,376 A, EP 0 906 797 B1, DE 199 53 915 A1, EP 2 038 076 B1 and EP 3 061 535 A1. A stretch straightener immediately behind the hot strip mill is disclosed in US 4 539 830 A and within the cooling section in DE 10 2013 214 344 A1. Further solutions are shown in DE 10 2005 060 046 B4 and EP 1 230 993 B1.
Die vorbekannten Lösungen gemäß den genannten Druckschriften haben verschiedene Nachteile. Der Erfindung liegt daher die A u f g a b e zugrunde, ein Verfahren und eine Anlage bereitzustellen, mit dem bzw. mit der es möglich ist, den Planheitsgrad des Bandes zu erhöhen. Die L ö s u n g dieser Aufgabe durch die Erfindung ist dadurch gekennzeichnet, dass das Band zwischen dem Walzwerk und dem Biegestreckrichter zumindest zeitweise unter einer ersten Zugspannung gehalten wird, dass das Band in Förderrichtung hinter dem Biegestreckrichter zumindest zeitweise unter einer zweiten Zugspannung gehalten wird und dass das Band im Bereich des Biegestreckrichters zumindest zeitweise unter einer dritten Zugspannung gehalten wird, wobei die dritte Zugspannung größer ist als die erste Zugspannung und die zweite Zugspannung. The previously known solutions according to the cited documents have various disadvantages. The invention is therefore based on the object of providing a method and a system with which it is possible to increase the degree of flatness of the strip. The solution to this problem by the invention is characterized in that the strip is held at least temporarily under a first tensile stress between the rolling mill and the bending stripper, that the strip is held in the conveying direction behind the bending stripper at least temporarily under a second tensile stress and that the Band is held at least temporarily under a third tensile stress in the region of the bending straightener, wherein the third tensile stress is greater than the first tensile stress and the second tensile stress.
Die erste Zugspannung und die zweite Zugspannung betragen dabei bevorzugt zwischen 5 und 25 N/mm2. Die dritte Zugspannung beträgt bevorzugt zwischen 30 und 80 N/mm2, besonders bevorzugt zwischen 40 und 60 N/mm2. Ausgenommen von besagter Zugspannung sind der Kopf und das Ende des Bandes. Das Zugniveau auf der Transportstrecke vor der Biegestreckrichterstrecke und der Transportstrecke nach der Biegestreckrichterstrecke kann dabei unterschiedlich sein. The first tensile stress and the second tensile stress are preferably between 5 and 25 N / mm 2 . The third tensile stress is preferably between 30 and 80 N / mm 2 , more preferably between 40 and 60 N / mm 2 . Excluded from said tension are the head and the end of the band. The train level on the transport route before the bending straightener section and the transport route after the bending straightener section may be different.
Das mittlere Zugniveau innerhalb der Streckrichterstrecke wird vorzugsweise abhängig vom Bandmaterial, der Bandtemperatur innerhalb der Richtstrecke und der Banddicke bestimmt und wird vorzugsweise mit einem Prozessmodell eingestellt und geregelt. Auch das Zugniveau in den benachbarten Transportstrecken legt ein Prozessmodell fest. The mean tension level within the drafting straightener section is preferably determined as a function of the strip material, the strip temperature within the straightening section and the strip thickness, and is preferably set and controlled using a process model. The train level in the adjacent transport routes also defines a process model.
Die Zugniveaus auf der langen Transportstrecke zwischen dem letzten aktiven Walzgerüst und dem ersten Treiber des Biegestreckrichters sowie der Transportstrecke vom zweiten Treiber des Biegestreckrichters und dem Haspeltreiber oder dem Haspel ist somit niedriger als das Zugniveau innerhalb der Biegestreckrichterstrecke. Demgemäß sind die Züge im Bereich der Biege- streckrichterstrecke von den Nachbarstrecken entkoppelt. The train levels on the long transport route between the last active rolling stand and the first driver of the bending jig and the transport distance from the second driver of the bending jig and the reel driver or the reel is thus lower than the Zugniveau within the Bending trek judge distance. Accordingly, the trains are decoupled from the neighboring routes in the area of the bending stretcher route.
Die Zugspannung im Band wird bevorzugt durch einen ersten Treiber und einen zweiten Treiber beeinflusst, gesteuert oder geregelt, wobei der erste Treiber in Förderrichtung vor dem Biegestreckrichter und der zweite Treiber in Förderrichtung hinter dem Biegestreckrichter angeordnet ist oder die beiden Treiber die Erstreckung des Biegestreckrichters in Förderrichtung begrenzen (im letztgenannten Fall sind die beiden Treiber also Bestandteil des Biegestreck- richters). Die unterschiedlichen Zugniveaus werden also durch die Treiber vor und hinter dem Biegestreckrichter eingestellt. Statt dem zweiten Treiber hinter dem Biegestreckrichter kann auch deren Aufgabe ein Scherentreiber oder ein Haspeltreiber übernehmen. In diesem Fall wird die erhöhte dritte Zugspannung im Bereich des Biegestreckrichters zwischen dem ersten Treiber und einem Haspeltreiber aufgebaut. Der Abstand a gilt dann zwischen dem ersten Treiber und dem Haspeltreiber. Der zweite Treiber ist dann geöffnet oder nicht installiert. Die zweite Zugspannung gilt dann nur zwischen Haspeltreiber und Haspel. Hinter dem zweiten Treiber der Biegestreckrichtereinheit kann auch noch zusätzlich mindestens ein weiterer Treiber (z. B. ein Scherentreiber) angeordnet werden. The tension in the belt is preferably influenced, controlled or regulated by a first driver and a second driver, wherein the first driver is arranged in the conveying direction before the bending straightener and the second driver in the conveying direction behind the bending straightener or the two drivers the extension of the bending straightener in the conveying direction limit (in the latter case, the two drivers are thus part of the bending straightener). The different train levels are thus adjusted by the drivers in front of and behind the bending straightener. Instead of the second driver behind the Biegestreckrichter can also take over their task, a scissors driver or a reel driver. In this case, the increased third tensile stress is built up in the area of the bending straightener between the first driver and a reel driver. The distance a then applies between the first driver and the reel driver. The second driver is then opened or not installed. The second tension is then only between reel driver and reel. At least one further driver (eg a scissors driver) can additionally be arranged behind the second driver of the bending extensifier unit.
Das Band wird bevorzugt zwischen dem Walzwerk und dem Biegestreckrichter einer Kühlung in einer Kühlstrecke unterzogen. Vorzugsweise findet eine Kühlung in Förderrichtung hinter dem Biegestreckrichter nicht mehr statt. Der Vorteil dieser Art der Kühlung des Bandes ist, dass auf diese Weise die Kühlstrecke nicht mehr die Planheit des Bandes beeinflusst. The strip is preferably subjected to cooling in a cooling section between the rolling mill and the bending straightener. Preferably, cooling in the conveying direction behind the bending straightener no longer takes place. The advantage of this type of cooling of the belt is that in this way the cooling section no longer influences the flatness of the belt.
Das Band weist bevorzugt bei seinem Biegestreckrichtprozess eine Temperatur auf, die zwischen 20 °C und 750 °C liegt, besonders bevorzugt zwischen 200 °C und 600 °C. Mit dem genannten Verfahren wird besonders vorteilhaft ein Warmband hergestellt, das eine Dicke zwischen 0,5 mm und 2,5 mm aufweist. The strip preferably has a temperature in its bending straightening process which is between 20 ° C and 750 ° C, more preferably between 200 ° C and 600 ° C. With the method mentioned, it is particularly advantageous to produce a hot strip having a thickness of between 0.5 mm and 2.5 mm.
Die Anlage zur Herstellung eines metallischen Bandes umfasst ein Walzwerk zum Walzen des Bandes, einen dem Walzwerk in Förderrichtung des Bandes nachgelagerten Biegestreckrichter und mindestens einen dem Biegestreckrichter in Förderrichtung nachgelagerten Haspel und sieht erfindungsgemäß vor, dass der Biegestreckrichter einen in Förderrichtung vorne angeordneten ersten Treiber und einen in Förderrichtung hinten angeordneten zweiten Treiber aufweist, wobei die beiden Treiber die Erstreckung des Biegestreckrichters begrenzen und wobei der Abstand in Förderrichtung zwischen dem ersten Treiber und dem zweiten Treiber höchstens 20 m beträgt. Bevorzugt beträgt der Abstand höchstens 5 m. Hierdurch minimiert sich die Durchlaufzeit durch den Biegestreckrichter und die damit verbundene Einschnürung des Bandes infolge des Zuges. The plant for producing a metallic strip comprises a rolling mill for rolling the strip, a rolling mill downstream of the rolling mill in the conveying direction of the strip and at least one downstream of the bending straightener in the conveying direction and provides according to the invention that the bending straightener arranged in the conveying direction at the front first driver and a in the conveying direction arranged behind the second driver, wherein the two drivers limit the extension of the bending straightener and wherein the distance in the conveying direction between the first driver and the second driver is at most 20 m. Preferably, the distance is at most 5 m. This minimizes the cycle time through the bending straightener and the associated constriction of the band due to the train.
Zwischen dem Walzwerk und dem Biegestreckrichter ist bevorzugt eine Kühlstrecke angeordnet; hinter dem Biegestreckrichter folgt bevorzugt keine Kühlstrecke mehr. Der Biegestreckrichter weist eine Anzahl Rollen zur Einleitung eines Biegemoments in das Band auf, wobei der Durchmesser der Rollen bevorzugt mindestens 50 mm beträgt, besonders bevorzugt mindestens 100 mm. Between the rolling mill and the bending straightener, a cooling section is preferably arranged; behind the bending straightener preferably no cooling track follows. The bending straightener has a number of rollers for introducing a bending moment into the belt, wherein the diameter of the rollers is preferably at least 50 mm, particularly preferably at least 100 mm.
Die Biegestreckrichterstrecke beinhaltet einen Biegestreckrichter bestehend aus einer Anzahl Rollen (beispielsweise 5 Rollen) und/oder einer Rückbiegeeinheit bestehend aus weiteren Rollen (beispielsweise 3 Rollen). The bending straightener section comprises a bending straightener consisting of a number of rollers (for example 5 rollers) and / or a back bending unit consisting of further rollers (for example 3 rollers).
Der Treiber kann in der klassischen Bauform aus aufeinander stehenden zwei Rollen bestehen oder mit einer versetzten Anordnung der Rollen ausgeführt sein, um einen Umschlingungswinkel und eine gegebenenfalls zusätzliche Drehmomentenübertragung zu erzeugen. Damit das Band infolge der Streckrichter-Rollenkühlung (was insbesondere bei der Endlos-Walzung wichtig ist) nicht übermäßig gekühlt wird, haben die Streckrichterrollen vorzugsweise eine Innenkühlung und/oder sie werden bei einer Außenkühlung mit Abstreiferplatten zum Abschirmen des Wassers vom Band ausgerüstet, damit die Haspeltemperatur nicht negativ beeinflusst wird. Die Bandkühlung in der Biegestreckrichterstrecke wird weiterhin berücksichtigt und bei der Festlegung der Zielbandtemperatur hinter der Kühlstrecke berücksichtigt, so dass die gewünschte Haspeltemperatur erzeugt wird. The driver may be in the classic design of successive two roles or be designed with an offset arrangement of the rollers to produce a wrap angle and optionally additional torque transmission. In order for the strip not to be excessively cooled due to the draft tube roll cooling (which is particularly important in endless rolling), the drafting strip rolls preferably have internal cooling and / or are externally cooled with stripper plates to shield the water from the strip to allow the strip to cool Reel temperature is not adversely affected. The strip cooling in the bending straightener section is further taken into account and taken into account when determining the target strip temperature behind the cooling section, so that the desired coil temperature is generated.
Die Erfindung bezieht sich somit insbesondere auf einen Warmbiegestreckrichter hinter einer Warmbandstraße. The invention thus relates in particular to a hot bending stripper behind a hot strip mill.
Die vorgeschlagene Lösung stellt somit eine Optimierung der Biegestreckrichter- anordnung sowie der Zugverteilung bereit, was in der Folge zu einem verbesserten Planheitsgrad des hergestellten Bandes führt. The proposed solution thus provides an optimization of the Biegestreckrichter- arrangement and the Zugverteilung ready, resulting in the consequence to an improved degree of planarity of the produced strip.
Eine gute Planheitsverbesserung mittels eines Biegestreckrichtprozesses ergibt sich bei gegebenem Bandmaterial bei hohen Bandzügen, hohen Bandtem- peraturen und kleinen Biegeradien des Bandes, d. h. bei kleinen Richtrollendurchmessern. Zu kleine Richtrollendurchmesser sind jedoch bezüglich Wartungsaufwand, Standzeit bzw. Rollenverschleiß nachteilig. Zu hohe Züge und/oder zu hohe Bandtemperaturen ergeben große Breiteneinschnürungen auf der langen Strecke zwischen dem letzten Walzgerüst der Warmbandstraße und dem Haspel. Die Breiteneinschnürung infolge Bandzuges ist unter anderem auch abhängig vom Planheitszustand selbst und damit schwierig zu bestimmen. Weiterhin beeinflusst die Kühlstrecke ebenfalls den Planheitszustand des Bandes. A good flatness improvement by means of a bending straightening process results for a given strip material at high strip tension, high strip temperatures and small bending radii of the strip, d. H. with small straightening roll diameters. Too small roll diameter are disadvantageous in terms of maintenance, service life or role wear. Too high a draft and / or too high strip temperatures will result in large width constrictions on the long stretch between the last mill stand of the hot strip mill and the reel. The width constriction due to strip tension is also dependent on the flatness state itself and thus difficult to determine. Furthermore, the cooling section also influences the flatness condition of the belt.
Bei Berücksichtigung dieser Erkenntnisse ergibt sich eine optimale Streck- richteranordnung, die sich insbesondere durch die obigen Merkmale auszeichnet. In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. Es zeigen: Taking into account these findings results in an optimal straightener arrangement, which is characterized in particular by the above features. In the drawing, an embodiment of the invention is shown. Show it:
Fig. 1 schematisch in der Seitenansicht eine Anlage zur Herstellung eines Bandes und Fig. 1 shows a schematic side view of a system for producing a belt and
Fig. 2 den Verlauf der Zugspannung im Band über der Erstreckung in Längsrichtung der Anlage. Fig. 2 shows the course of the tensile stress in the band over the extension in the longitudinal direction of the plant.
In Figur 1 ist eine Anlage zur Herstellung eines Stahlbandes 1 dargestellt, wobei von einem Walzwerk 2 nur das letzte Walzgerüst angedeutet ist, von dem aus das Band 1 in Förderrichtung F in Richtung eines Haspels 4 ausläuft (beispielhaft vorgesehen sind hier zwei Haspel 4). Zwischen dem Walzwerk 2 und dem Haspel 4 ist ein Biegestreckrichter 3 angeordnet, in dem das Band durch einen Biegestreckrichtprozess gerichtet wird. In Figure 1, a plant for the production of a steel strip 1 is shown, of a rolling mill 2, only the last rolling mill is indicated, from which the belt 1 in the conveying direction F in the direction of a reel 4 expires (provided here are two reel 4). Between the rolling mill 2 and the reel 4, a bending straightener 3 is arranged, in which the band is directed by a bending straightening process.
Der Biegestreckrichter 3 wird von einem ersten Treiber 5 und einem zweiten Treiber 6 in seiner Erstreckung in Förderrichtung F begrenzt, wobei zwischen den beiden Treibern 5, 6 ein Abstand a vorliegt. Der Biegestreckrichter 3 weist eine Anzahl von Rollen 8 auf, die zur Aufbringung entsprechender Biegebeanspruchung auf das Band 1 in an sich bekannter Weise ausgebildet sind. The bending straightener 3 is limited by a first driver 5 and a second driver 6 in its extension in the conveying direction F, wherein there is a distance a between the two drivers 5, 6. The bending straightener 3 has a number of rollers 8, which are designed to apply corresponding bending stress on the band 1 in a conventional manner.
Vorgesehen ist eine Kühlstrecke 7, die zwischen dem Walzwerk 2 und dem Biegestreckrichter 3 angeordnet ist und mit der das Band 1 gekühlt werden kann. Weiterhin sind in Figur 1 einige Komponenten angedeutet, die für die Durchführung des Produktionsprozesses des Bandes 1 relevant sind, nämlich eine Planheitsmessvorrichtung 9, eine Temperaturmessvorrichtung 10, eine Temperaturmessvorrichtung 1 1 , eine Schere 12 sowie eine Haspel-Temperaturmessvorrichtung 13. Die Förderung des Bandes 1 zwischen dem Walzwerk 2 und dem Haspel 4 ergibt sich aus dem Zusammenspiel des letzten Walzgerüsts des Walzwerks, des ersten und des zweiten Treibers 5, 6 und im Ausführungsbeispiel durch einen Haspeltreiber 14. Durch entsprechende Regelung der genannten Komponenten und insbesondere des ersten und des zweiten Treibers 5, 6 kann die Zugspannung im Band beeinflusst werden. Provided is a cooling section 7, which is arranged between the rolling mill 2 and the bending straightener 3 and with which the belt 1 can be cooled. Furthermore, some components are indicated in FIG. 1, which are relevant for carrying out the production process of the strip 1, namely a flatness measuring device 9, a temperature measuring device 10, a temperature measuring device 11, a pair of scissors 12 and a reel temperature measuring device 13. The promotion of the belt 1 between the rolling mill 2 and the reel 4 results from the interaction of the last mill stand of the rolling mill, the first and the second driver 5, 6 and in the embodiment by a reel driver 14. By appropriate regulation of said components and in particular the first and second drivers 5, 6, the tension in the band can be influenced.
Wie dies erfindungsgemäß erfolgt, ergibt sich aus der Darstellung gemäß Figur 2, wo der Verlauf der Zugspannung über der Strecke s (in Förderrichtung F verlaufend) dargestellt ist. How this is done according to the invention results from the illustration according to FIG. 2, where the course of the tensile stress over the distance s (running in the conveying direction F) is shown.
Zu erkennen ist, dass zwischen dem Walzwerk 2 und dem Biegestreckrichter 3 zunächst eine erste Zugspannung σι vorliegt, die bevorzugt in einem Bereich zwischen 5 und 25 N/mm2 liegt. It can be seen that between the rolling mill 2 and the bending straightener 3 initially there is a first tensile stress σι, which is preferably in a range between 5 and 25 N / mm 2 .
Zwischen dem Biegestrickrichter 3 und dem Haspel 4 liegt eine zweite Zugspannung < 2 vor, die ebenfalls bevorzugt in einem Bereich zwischen 5 und 25 N/mm2 liegt. Dabei müssen die beiden Zugspannung σι und σ2 keinesfalls gleich sein. Between the bending yoke 3 and the reel 4 there is a second tensile stress < 2 , which is also preferably in a range between 5 and 25 N / mm 2 . The two tensile stress σι and σ 2 must by no means be the same.
Indes liegt die Zugspannung im Bereich des Biegestreckrichters 3 auf einem höheren Niveau. Die hier vorliegende dritte Zugspannung σ3 liegt in einem bevorzugten Bereich zwischen 40 und 60 N/mm2. Vorteilhaft ist dabei vorgesehen, dass der Abstand a relativ kurz ist und sich bevorzugt lediglich über etwa 5 m erstreckt. Hierdurch ist die Durchlaufzeit durch den Biegestreckrichter 3 gering, woraus sich auch eine nur geringe Einschnürung des Bandes infolge des Zuges ergibt. Zum Trennen der Bänder wird beim Endloswalzen die Schere 12 eingesetzt. Die Zugspannung σ2 ist dadurch für einen kurzen Zeitraum = 0. Der Treiber 6 übernimmt denn den Zuganteil σ2, um den Zug σ3 im Biegestrecknchterbereich aufrecht halten zu können. However, the tensile stress in the region of the bending straightener 3 is at a higher level. The present here third tension σ3 is in a preferred range between 40 and 60 N / mm 2. It is advantageously provided that the distance a is relatively short and preferably extends only over about 5 m. As a result, the throughput time is low by the bending jig 3, resulting in only a small constriction of the band due to the train. To separate the bands, the scissors 12 is used in continuous rolling. The tensile stress σ 2 is characterized for a short period = 0. The driver 6 takes over the tensile component σ 2 , in order to keep the train σ 3 in the Biegestrecknchterbereich upright.
Der Biegestreckrichtprozess wird hierdurch wesentlich verbessert. Dies gilt insbesondere, wenn der Prozess mit weiteren Parametern betrieben wird, wie es oben erläutert wurde. The bending straightening process is thereby significantly improved. This applies in particular if the process is operated with further parameters, as explained above.
Dies gilt insbesondere mit Blick auf die Temperaturführung, die bevorzugt so gewählt wird, dass das Band 1 im Bereich des Biegestrickrichters 3 eine Temperatur zwischen 200 °C und 600 °C aufweist. This applies in particular with a view to the temperature control, which is preferably chosen so that the band 1 in the region of the bending jig 3 has a temperature between 200 ° C and 600 ° C.
Bezugszeichenliste: LIST OF REFERENCE NUMBERS
1 Band 1 band
2 Walzwerk  2 rolling mill
3 Biegestreckhchter  3 bending stickman
4 Haspel  4 reel
5 erster Treiber  5 first driver
6 zweiter Treiber  6 second driver
7 Kühlstrecke  7 cooling section
8 Rolle  8 roll
9 Planheitsmessvornchtung  9 Flatness measuring device
10 Temperaturmessvorrichtung 10 temperature measuring device
1 1 Temperaturmessvorrichtung1 1 temperature measuring device
12 Schere 12 scissors
13 Haspel-Temperaturmessvorrichtung 13 reel temperature measuring device
14 Haspeltreiber σι erste Zugspannung 14 reel driver σι first tensile stress
02 zweite Zugspannung  02 second tension
σ3 dritte Zugspannung σ3 third tension
a Abstand a distance
s Strecke s route
F Förderrichtung  F conveying direction

Claims

Patentansprüche: claims:
1 . Verfahren zur Herstellung eines metallischen Bandes (1 ), wobei das Band (1 ) in einem Walzwerk (2) gewalzt wird, wobei das Band (1 ) an einer dem Walzwerk (2) in Förderrichtung (F) nachgelagerten Stelle einem Biege- streckrichtprozess in einem Biegestreckrichter (3) unterzogen wird und wobei das Band (1 ) an einer dem Biegestreckrichter (3) in Förderrichtung (F) nachgelagerten Stelle auf einem Haspel (4) aufgehaspelt wird, dadurch gekennzeichnet, dass das Band (1 ) zwischen dem Walzwerk (2) und dem Biegestreckrichter (3) zumindest zeitweise unter einer ersten Zugspannung (σι) gehalten wird, dass das Band (1 ) in Förderrichtung (F) hinter dem Biegestreckrichter (3) zumindest zeitweise unter einer zweiten Zugspannung (σ2) gehalten wird und dass das Band (1 ) im Bereich des Biegestreckrichters (3) zumindest zeitweise unter einer dritten Zugspannung (σ3) gehalten wird, wobei die dritte Zugspannung (σ3) größer ist als die erste Zugspannung (σι) und die zweite Zugspannung (σ2). 1 . Method for producing a metallic strip (1), wherein the strip (1) is rolled in a rolling mill (2), wherein the strip (1) is subjected to a bending stretch straightening process at a point downstream of the rolling mill (2) in the conveying direction (F) subjected to a bending straightener (3) and wherein the band (1) is reeled on a reel (4) at a location downstream of the bending straightener (3) in the conveying direction (F), characterized in that the band (1) is conveyed between the rolling mill (3). 2) and the bending straightener (3) at least temporarily under a first tensile stress (σι) is maintained, that the band (1) in the conveying direction (F) behind the bending straightener (3) at least temporarily under a second tensile stress (σ2) is held and the strip (1) is held at least temporarily under a third tensile stress (σ3) in the region of the bending straightener (3), the third tensile stress (σ3) being greater than the first tensile stress (σι) and the second tensile stress (σ2).
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die erste Zugspannung (σι) und die zweite Zugspannung (σ2) zwischen 5 und 25 N/mm2 betragen. 2. The method according to claim 1, characterized in that the first tensile stress (σι) and the second tensile stress (σ2) be between 5 and 25 N / mm 2 .
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die dritte Zugspannung (σ3) zwischen 30 und 80 N/mm2 beträgt, vorzugsweise zwischen 40 und 60 N/mm2. 3. The method according to claim 1 or 2, characterized in that the third tensile stress (σ3) is between 30 and 80 N / mm 2 , preferably between 40 and 60 N / mm 2 .
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Zugspannung im Band (1 ) durch einen ersten Treiber (5) und einen zweiten Treiber (6) beeinflusst, gesteuert oder geregelt wird, wobei der erste Treiber (5) in Förderrichtung (F) vor dem Biegestreckrichter (3) und der zweite Treiber (6) in Förderrichtung (F) hinter dem Biegestreckrichter (3) angeordnet ist oder die beiden Treiber (5, 6) die Erstreckung des Biegestreckrichters (3) in Förderrichtung (F) begrenzen. 4. The method according to any one of claims 1 to 3, characterized in that the tension in the band (1) by a first driver (5) and a second driver (6) is influenced, controlled or regulated, wherein the first driver (5) in the conveying direction (F) in front of the bending straightener (3) and the second driver (6) in the conveying direction (F) behind the bending straightener (3) is arranged or the two drivers (5, 6) the extension of the bending straightener (3) in the conveying direction ( F) limit.
5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das Band (1 ) zwischen dem ersten Treiber (5) und dem Haspeltreiber (14) optional zeitweise unter der dritten Zugspannung (σ3) gehalten wird. 5. The method according to any one of claims 1 to 4, characterized in that the band (1) between the first driver (5) and the reel driver (14) is optionally temporarily held under the third tension (σ 3 ).
6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das Band (1 ) zwischen dem Walzwerk (2) und dem Biegestreckrichter (3) einer Kühlung in einer Kühlstrecke (7) unterzogen wird. 6. The method according to any one of claims 1 to 5, characterized in that the strip (1) between the rolling mill (2) and the bending straightener (3) is subjected to cooling in a cooling section (7).
7. Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass das Band (1 ) bei seinem Biegestreckrichtprozess eine Temperatur aufweist, die zwischen 20 °C und 750 °C liegt, vorzugsweise zwischen 200 °C und 600 °C. 7. The method according to any one of claims 1 to 6, characterized in that the strip (1) in its Biegestreckrichtprozess has a temperature which is between 20 ° C and 750 ° C, preferably between 200 ° C and 600 ° C.
8. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass mit ihm ein Warmband hergestellt wird, das eine Dicke zwischen 0,5 mm und 2,5 mm aufweist. 8. The method according to any one of claims 1 to 7, characterized in that it produces a hot strip having a thickness between 0.5 mm and 2.5 mm.
9. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die verschiedenen Zugniveaus σι, σ2, σ3 abhängig von Dicke, Temperatur und Bandmaterial von einem Prozessmodell vorgegeben werden. Anlage zur Herstellung eines metallischen Bandes (1 ), umfassend ein Walzwerk (2) zum Walzen des Bandes (1 ), einen dem Walzwerk (2) in Förderrichtung (F) des Bandes (1 ) nachgelagerten Biegestreckrichter (3) und mindestens einen dem Biegestreckrichter (3) in Förderrichtung (F) nachgelagerten Haspel (4), dadurch gekennzeichnet, dass der Biegestreckrichter (3) einen in Förderrichtung (F) vorne angeordneten ersten Treiber (5) und einen in Förderrichtung (F) hinten angeordneten zweiten Treiber (6) aufweist, wobei die beiden Treiber (5, 6) die Erstreckung des Biegestreckrichters (3) begrenzen und wobei der Abstand (a) in Förderrichtung (F) zwischen dem ersten Treiber (5) und dem zweiten Treiber (6) höchstens 20 m beträgt. 9. The method according to any one of claims 1 to 8, characterized in that the different train levels σι, σ 2 , σ 3 are determined depending on the thickness, temperature and strip material of a process model. Plant for producing a metallic strip (1), comprising a rolling mill (2) for rolling the strip (1), a bending stripper (3) downstream of the rolling mill (2) in the conveying direction (F) of the strip (1) and at least one bending straightener (3) in the conveying direction (F) downstream reel (4), characterized in that the bending straightener (3) in the conveying direction (F) arranged at the front first driver (5) and a downstream in the conveying direction (F) second driver (6) wherein the two drivers (5, 6) limit the extent of the bending straightener (3) and wherein the distance (a) in the conveying direction (F) between the first driver (5) and the second driver (6) is at most 20 m.
Anlage nach Anspruch 10, dadurch gekennzeichnet, dass der Abstand (a) höchstens 5 m beträgt. Installation according to claim 10, characterized in that the distance (a) is at most 5 m.
Anlage nach Anspruch 10 oder 1 1 , dadurch gekennzeichnet, dass der zweite Treiber (6) in Förderrichtung (F) hinter dem Biegestreckrichter (3) optional ein Haspeltreiber (14) oder Scherentreiber ist. Installation according to claim 10 or 1 1, characterized in that the second driver (6) in the conveying direction (F) behind the bending straightener (3) is optionally a reel driver (14) or scissors driver.
Anlage nach einem der Ansprüche 10 bis 12, dadurch gekennzeichnet, dass zwischen dem Walzwerk (2) und dem Biegestreckrichter (3) eine KühlstreckeInstallation according to one of claims 10 to 12, characterized in that between the rolling mill (2) and the bending straightener (3) has a cooling section
(7) angeordnet ist. (7) is arranged.
Anlage nach einem der Ansprüche 10 bis 13, dadurch gekennzeichnet, dass der Biegestreckrichter (3) eine Anzahl Rollen (8) zur Einleitung eines Biegemoments in das Band (1 ) aufweist, wobei der Durchmesser der RollenPlant according to one of Claims 10 to 13, characterized in that the bending straightener (3) has a number of rollers (8) for introducing a bending moment into the belt (1), the diameter of the rollers
(8) mindestens 50 mm beträgt, vorzugsweise mindestens 100 mm. (8) is at least 50 mm, preferably at least 100 mm.
15. Anlage nach einem der Ansprüche 10 bis 14, dadurch gekennzeichnet, dass die Biegestreckrichterstrecke aus einem Biegestreckrichter bestehend aus einer Anzahl Rollen und/oder einer Rückbiegeeinheit mit mehr als einer weiteren Rolle besteht. 15. Installation according to one of claims 10 to 14, characterized in that the bending straightener stretch consists of a bending straightener consisting of a number of rollers and / or a return bending unit with more than one further role.
16. Anlage nach einem der Ansprüche 10 bis 15, dadurch gekennzeichnet, dass der Biegestreckrichter (3) oder/und der erste Treiber (5) oder/und der zweite Treiber (6) abhängig von der Verwendung oder nicht Verwendung der Biegestreckrichtereinheit in die Transportlinie geschoben oder neben die Transportlinie bewegt und durch einen Rollgang ersetzt werden kann. 16. Installation according to one of claims 10 to 15, characterized in that the bending straightener (3) and / or the first driver (5) and / or the second driver (6) depending on the use or not use of the bending stripper unit in the transport line pushed or moved next to the transport line and can be replaced by a roller table.
EP17787184.5A 2016-11-07 2017-10-20 Method and system for producing a metal strip Active EP3535071B1 (en)

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DE102017202909.9A DE102017202909A1 (en) 2016-11-07 2017-02-23 Method and plant for producing a metallic strip
PCT/EP2017/076887 WO2018082943A1 (en) 2016-11-07 2017-10-20 Method and system for producing a metal strip

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DE2537188C3 (en) 1975-08-21 1978-05-18 Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh, 4100 Duisburg Method and device for the production of hot strip with improved quality properties
US4316376A (en) 1980-05-15 1982-02-23 Sumitomo Metal Industries, Ltd. Method for preventing wandering of strip under roller leveling in hot rolling line
DE3234160C2 (en) 1982-09-15 1986-10-23 Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh, 4100 Duisburg Method and hot strip mill for producing thin metal strip, in particular metal wide strip, from hot strip
GB2163689A (en) 1984-08-31 1986-03-05 Davy Mckee Hot rolling metal strip
DE4103804A1 (en) * 1991-02-08 1992-08-13 Bwg Bergwerk Walzwerk ALIGNMENT SYSTEM FOR FINAL TAPES, IN PARTICULAR METAL TAPES
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JP3590288B2 (en) * 1999-02-15 2004-11-17 住友重機械工業株式会社 Strip plate leveling method and leveling device
DE19953915A1 (en) 1999-11-10 2001-07-05 Thyssenkrupp Stahl Ag Processing hot strip on path of hot strip mill connected directly to coiler for winding strip, comprises smoothing the still hot strip by mechanical deformation
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DE102005060046B4 (en) 2005-12-15 2008-08-14 Siemens Ag Walzstrasse with at least two band influencing devices and method for operating such a rolling train
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EP3061535B1 (en) 2015-02-27 2019-02-27 Primetals Technologies Austria GmbH Reel device with asymmetric cooling of the reeled strip

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JP2020500713A (en) 2020-01-16

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