EP1455975B1 - Method and device for the production of a trimmed metal strip - Google Patents

Method and device for the production of a trimmed metal strip Download PDF

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Publication number
EP1455975B1
EP1455975B1 EP02793060A EP02793060A EP1455975B1 EP 1455975 B1 EP1455975 B1 EP 1455975B1 EP 02793060 A EP02793060 A EP 02793060A EP 02793060 A EP02793060 A EP 02793060A EP 1455975 B1 EP1455975 B1 EP 1455975B1
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EP
European Patent Office
Prior art keywords
strip
edges
installation
cooling
band
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02793060A
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German (de)
French (fr)
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EP1455975A1 (en
Inventor
Gerald Hohenbichler
Jean-Michel Damasse
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Primetals Technologies Austria GmbH
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Voest Alpine Industrienlagenbau GmbH
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Publication of EP1455975A1 publication Critical patent/EP1455975A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/126—Accessories for subsequent treating or working cast stock in situ for cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
    • B22D11/1246—Nozzles; Spray heads
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49988—Metal casting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49988—Metal casting
    • Y10T29/49989—Followed by cutting or removing material

Definitions

  • the invention relates to the continuous casting of metals and more specifically to the casting of Narrow thickness bands directly from liquid metal.
  • the casting of a metal strip is usually done on a plant to the so-called "Two-roll casting".
  • Such plants include, as main elements, the mold form and in which the band solidifies, two rollers with substantially horizontal axes, which are arranged opposite each other and around their respective axes are driven in opposite directions. These Rollers are internally cooled strongly, and their lateral surfaces define a casting mold with movable walls, where the solidification of the band in the form of two Strand bowls begins extending from the roll surfaces develop. These strand bowls essentially run at the height of the "kissing point, i.e.
  • tapes cast by these methods are generally intended to cold rolled to obtain sheets of standard thicknesses. Before that you can also be subjected to hot rolling, which is intended to microstructures to change and close porosities that are at the core of the band at his
  • the tapes cast in this way generally need to be cold rolled or preferably before its first winding after the casting of a Band edge trimming be subjected to a width of about 15 mm.
  • these band edges are formed of strand shell sections extending below conditions other than those which strengthen the more centralized ones Parts of the band have led, in particular due to the proximity of the lateral Closure walls that tend to cool the metal more than normal. Possible differences between the cooling caused by the rolls between their edges and their more central parts may also occur. The Cooling may be stronger at the edges than in the middle and vice versa, depending on Execution of the rolls.
  • the band edges can also have an irregular shape, which in the later rolling operations lead to inhomogeneities in the mechanical properties of the Sheet metal leads, in particular due to the local differences in the obtained Degree of reduction.
  • the band edges Unevenness that should be eliminated before cold rolling to an impairment to avoid the surface of the rolling cylinder.
  • trimming the band edges becomes a given Time of processing the tapes with the help of scissors or any other Tooling conventionally used in equipment for machining Tapes made by conventional methods is used.
  • the aim of the invention is to propose a method and a device which it allow to perform a satisfactory trimming of the band edges, too if the strip edges are initially at a higher temperature than this is desirable.
  • the invention relates to a method for producing a Metal band of a cast directly from liquid metal band, in which a Trimming the band edges is made, characterized in that the Band edges are cooled in a controlled manner before trimming to them more brittle than the rest of the band.
  • This metal can be steel, and the cooling of the strip edges begins in this Fall at a temperature of 950 to 1100 ° C.
  • the trimming of the strip edges immediately after the controlled Cooling down.
  • the trimming of the strip edges can be done before winding the tape become.
  • Controlled cooling of the strip edges may occur after hot rolling of the strip the rewarming of the tape by inductive Heating up precedes.
  • the controlled cooling of the strip edges takes place in-line with the casting of the band.
  • the invention also relates to a system for processing thin metal bands, which a system for casting thin strips directly from liquid metal, and comprising a system for trimming the strip edges, characterized in that a system for controlled exclusive or preferred cooling of the strip edges of the tape of a system for Trimming the band edges goes on.
  • the system for controlled cooling of the band edges of the tape can on the same processing line as the casting machine for thin strips.
  • the system for controlled cooling of the edges can be ramps with spray nozzles each directing a cooling fluid jet to one side of a belt edge.
  • the ramps can be located above and below the belt, and the spray nozzles direct the rays to the outside of the band.
  • the ramps can be arranged laterally of the belt, the spray nozzles direct the Blasting on the narrow side of the belt, and the system for controlled cooling
  • the edges also include barriers that are in sliding contact with the belt surface and each defining a portion of the width of the band edges, which the Effective range of the cooling fluid represents.
  • the invention consists in placing the edges of the tape in front of them Pruning strongly cool. This cooling is done by spraying a fluid to a width equal to the width of the area to be cropped.
  • the example of a casting plant for strips of metal, in particular of steel, in 1a conventionally comprises two casting rolls 1, 1 'which are inside cooled and in the opposite direction about their axes in a horizontal position be driven in rotation.
  • Lateral closure walls 2, 2 ' which are between the flat End faces 3, 3 'of the rollers 1, 1' are applied, limit with the side walls the rollers 1, 1 'a casting room, in the continuous liquid steel by not shown means such as by a refractory tube, with a Distributor is connected, is poured.
  • the solidification and the removal along the arrows 5 of a band 6 with a thickness of in general 1 to 10 mm achieved.
  • the belt 6 passes through in a known manner Induction furnace 7, which is destined to be before it enters a hot rolling stand 8, which reduces the thickness of the belt 6 by, for example, 10% or more heat.
  • the band edges 9, 9 'of the band 6 then become strong subjected to controlled cooling, while the rest of the belt 6 continue naturally or under the influence of a much more moderate controlled Cooling cools down.
  • band edge 9 'of the band 6 are sections to be understood, each extending from one of the edges of the band 6 on a width that reach 25 mm can, and then in a step preceding the cold rolling of the belt 6, be trimmed or trimmed.
  • this trimming is done immediately after the controlled Cooling and before winding the tape 6.
  • the system is used for controlled cooling of ramps 10, 10 ', 10 "formed, the spray nozzles, each having a beam 11 of a Direct cooling fluids to the belt 6.
  • This fluid can in a known manner, a water Water-air mixture, air, liquid nitrogen, etc., if it is in sufficient Amount is sprayed to the desired cooling effect at the band edges 9, 9 ' to achieve the band 6.
  • the ramps 10, 10 ', 10 "inject fluid jets 11, which are directed outside on the belt 6. In this way the fluid does not run the central region of the belt 6, the cooling of course thus continued becomes. In this way, the effect of cooling at the strip edges 9, 9 ', the are limited by dotted lines 12, 12 'limited.
  • This limitation of Localization of the cooling effect can be supplemented by the whole or one Part of the central area of the belt 6, which should not be cooled, with a or more caps is covered, this cap (s) in a small Distance from the surface of the belt 6 are held.
  • This solution offers the advantage over the previous one that the Surface of the central area remains free, causing his observation is easier.
  • a system for trimming the band edges which by circular saws 15, 15 ' are shown and are preferably formed by circular knife scissors, of course any known device that ensure this function on the expiring belt 6 can, can be used. Such devices are well known and are used in particular in rolling mills.
  • the wound coil can then be transported to the plant, which the Further treatment of the belt 6 ensures, for example, a cold rolling, a Annealing pickling, which precedes cold rolling, etc.
  • the system according to the invention for cooling the band edges of a thin strip, that was made by continuous casting is not necessarily in-line with the Casting plant arranged. It can be arranged at any point in the production chain be, where the temperature of the belt is greater than 950 ° C, so that the desired metallurgical effect is achieved for this cooling. It's not always required that the system 15, 15 'for trimming the strip edges 9, 9' immediately on the cooling system according to the invention follows, unless this cooling was not effective insofar as there is a risk that the breakage of the strip edges 9, 9 'spontaneously while editing the tape 6 before trimming the Band edges 9, 9 'may occur.
  • the step of cooling the band edges 9, 9 'with a step of controlled cooling of the entire band 6 for metallurgical reasons coincide.
  • this step is now a much stronger cooling at the strip edges 9, 9 'than at the remainder of the strip 6, around the invention use. It is thus no longer an exclusive in this way Cooling, but only a preferred cooling of the band edges 9, 9 '.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Metal Rolling (AREA)
  • Coating With Molten Metal (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)

Abstract

Process for trimming the edges (9, 9') of a thin metal strip (6), cast directly from molten steel (4), involves controlled cooling of the edges before trimming to make the edge zones more brittle than the remaining strip metal. Edge cooling starts at 950-1100 deg C, and edge trimming cutters (15,15') act directly after the cooling stage and before the strip is wound into a roll. Preferred Features: Edge cooling action is performed after hot rolling, where the strip has been heated by an induction heating system, or directly in-line after casting. Edge cooling action is applied by bars (10, 10') with spray jets which direct streams of a coolant fluid at the strip edges.

Description

Die Erfindung betrifft das Stranggießen von Metallen und genauer das Gießen von Bändern geringer Dicke direkt aus Flüssigmetall.The invention relates to the continuous casting of metals and more specifically to the casting of Narrow thickness bands directly from liquid metal.

Das Stranggießen von Metallbändern, insbesondere von Bändern aus Kohlenstoffstahl oder rostfreiem Stahl, mit einigen mm Dicke, vorzugsweise Banddicken von weniger als 10 mm, direkt aus Flüssigmetall ist heute in der Literatur gut bekannt.Continuous casting of metal strips, in particular strips of carbon steel or stainless steel, with a few mm thickness, preferably band thicknesses of less than 10 mm, directly from liquid metal is well known in the literature today.

Das Gießen eines Metallbandes erfolgt meistens auf einer Anlage zum sogenannten "Zweiwalzengießen". Solche Anlagen umfassen als Hauptelemente, die die Kokille bilden und in der sich das Band verfestigt, zwei Walzen mit im Wesentlichen horizontalen Achsen, die einander gegenüberliegend angeordnet sind und um ihre jeweiligen Achsen in entgegengesetzte Richtung drehangetrieben werden. Diese Walzen werden innen stark gekühlt, und ihre Mantelflächen definieren eine Gießform mit beweglichen Wänden, an denen die Verfestigung des Bandes in Form von zwei Strangschalen beginnt, die sich ausgehend von den Walzenoberflächen weiterentwickeln. Diese Strangschalen laufen im Wesentlichen auf Höhe des "kissing point" zusammen, d.h. der Zone, in der die Flächen der Walzen einander am nächsten und voneinander um einen Abstand entfernt sind, der der Dicke des gewünschten Bandes entspricht, um das Band zu bilden, das kontinuierlich aus der Gießform gezogen wird. Der Gießraum ist seitlich durch zwei feuerfeste Wände begrenzt, die gegen die flachen Enden der Walzen gelegt oder in einem sehr geringen Abstand zu diesen gehalten werden, um Metallleckagen zu vermeiden. Dieses Verfahren ist detaillierter beispielsweise in dem Dokument EP-A-0 698 433 beschrieben.The casting of a metal strip is usually done on a plant to the so-called "Two-roll casting". Such plants include, as main elements, the mold form and in which the band solidifies, two rollers with substantially horizontal axes, which are arranged opposite each other and around their respective axes are driven in opposite directions. These Rollers are internally cooled strongly, and their lateral surfaces define a casting mold with movable walls, where the solidification of the band in the form of two Strand bowls begins extending from the roll surfaces develop. These strand bowls essentially run at the height of the "kissing point, i.e. the zone where the surfaces of the rollers are closest to each other and are spaced from each other by a distance equal to the thickness of the desired one Tape matches to form the tape that is continuous from the mold is pulled. The casting room is bounded laterally by two refractory walls, the placed against the flat ends of the rolls or at a very close distance These are kept to avoid metal leakage. This procedure is described in more detail, for example, in document EP-A-0 698 433.

Es ist auch vorstellbar, dünne Metallbänder zu erzeugen, indem das Flüssigmetall auf die in Drehung befindliche Manteloberfläche einer einzigen gekühlten Gießwalze aufgebracht wird, auf der sich das Metall verfestigt. So kann ein Band mit einer im Allgemeinen geringeren Dicke als durch Gießen zwischen zwei Walzen erhalten werden. Aus der US-A 4,527,613 ist das Besäumen eines Metallbandes in diesem Dickenbereich auf einem Transportband noch vor der Durcherstarrung des Metallbandes mit mechanischen Mitteln oder einem Druckgasstrahl bekannt. Eine saubere Bandkanten ausbildung scheint damit jedoch nicht erzielbar.It is also conceivable to produce thin metal bands by applying the liquid metal the rotating mantle surface of a single cooled casting roll is applied, on which the metal solidifies. So a band with an im Generally lower in thickness than obtained by casting between two rolls become. From US-A 4,527,613 is the trimming of a metal strip in this Thickness range on a conveyor belt before the solidification of the metal strip known by mechanical means or a compressed gas jet. A clean Band edge training does not seem to be achievable.

Die durch diese Verfahren gegossenen Bänder sind im Allgemeinen dazu bestimmt, kaltgewalzt zu werden, um Bleche mit üblichen Dicken zu erhalten. Zuvor können sie auch einem Warmwalzen unterzogen werden, das dazu bestimmt ist, Gefügestrukturen zu verändern und Porositäten zu schließen, die sich im Kern des Bandes bei seiner The tapes cast by these methods are generally intended to cold rolled to obtain sheets of standard thicknesses. Before that you can also be subjected to hot rolling, which is intended to microstructures to change and close porosities that are at the core of the band at his

Verfestigung bilden können. Aus wirtschaftlicher Sicht ist es besonders vorteilhaft, dieses Warmwalzen mit einem auf dem Transportweg des soeben gegossenen Bandes aufgestellten Walzgerüstes durchzuführen.Solidification can form. From an economic point of view, it is particularly advantageous This hot rolling with a on the way of the just cast Bandes erected rolling mill.

Die auf diese Weise gegossenen Bänder müssen im Allgemeinen vor ihrem Kaltwalzen oder auch vorzugsweise vor ihrem ersten Aufwickeln nach dem Guss einer Bandkantenbesäumung auf eine Breite von ungefähr 15 mm unterzogen werden. Diese Bandkanten sind nämlich aus Strangschalenabschnitten gebildet, die sich unter anderen Bedingungen verfestigt haben als jene, die zur Verfestigung der zentraleren Teile des Bandes geführt haben, insbesondere aufgrund der Nähe der seitlichen Verschlusswände, die dazu neigen, das Metall stärker als normal abzukühlen. Mögliche Unterschiede zwischen den von den Walzen bewirkten Abkühlungen zwischen ihren Kanten und ihren zentraleren Teilen können ebenfalls vorkommen. Die Abkühlung kann an den Kanten stärker sein als in der Mitte und umgekehrt, je nach Ausführung der Walzen. Diese Unterschiede, die beim Verfestigungs- und Abkühlungsverfahren zwischen den Kanten und dem Rest des Bandes oft schlecht steuerbar sind, verursachen oft Unterschiede in den mechanischen Eigenschaften des Bandes entlang seiner Breite. Die unter diesen Bedingungen hergestellten Bleche können somit inhomogene Eigenschaften aufweisen, was zu vermeiden ist.The tapes cast in this way generally need to be cold rolled or preferably before its first winding after the casting of a Band edge trimming be subjected to a width of about 15 mm. Namely, these band edges are formed of strand shell sections extending below conditions other than those which strengthen the more centralized ones Parts of the band have led, in particular due to the proximity of the lateral Closure walls that tend to cool the metal more than normal. Possible differences between the cooling caused by the rolls between their edges and their more central parts may also occur. The Cooling may be stronger at the edges than in the middle and vice versa, depending on Execution of the rolls. These differences, which in the solidification and Cooling process between the edges and the rest of the band often bad are controllable, often cause differences in the mechanical properties of the Bandes along its width. The sheets produced under these conditions can thus have inhomogeneous properties, which should be avoided.

Die Bandkanten können auch eine unregelmäßige Form aufweisen, was bei den späteren Walzvorgängen zu Inhomogenitäten in den mechanischen Eigenschaften der Bleche führt, insbesondere aufgrund der lokalen Unterschiede im erhaltenen Reduktionsgrad. Wenn andererseits Flüssigmetallleckagen zwischen den Gießwalzen und den seitlichen Verschlusswänden entstehen, weisen die Bandkanten Unebenheiten auf, die vor dem Kaltwalzen beseitigt werden sollten, um eine Beeinträchtigung der Oberfläche der Walzzylinder zu vermeiden.The band edges can also have an irregular shape, which in the later rolling operations lead to inhomogeneities in the mechanical properties of the Sheet metal leads, in particular due to the local differences in the obtained Degree of reduction. On the other hand, if liquid metal leakage between the casting rolls and the lateral closure walls emerge, have the band edges Unevenness that should be eliminated before cold rolling to an impairment to avoid the surface of the rolling cylinder.

Aus all diesen Gründen wird ein Besäumen der Bandkanten zu einem gegebenen Zeitpunkt der Bearbeitung der Bänder mit Hilfe einer Schere oder jedes anderen Werkzeugs vorgenommen, das herkömmlicherweise bei Anlagen zur Bearbeitung von Bändern, die durch übliche Verfahren hergestellt wurden, verwendet wird.For all these reasons, trimming the band edges becomes a given Time of processing the tapes with the help of scissors or any other Tooling conventionally used in equipment for machining Tapes made by conventional methods is used.

Im Prinzip ist es vorteilhaft, das Besäumen der Bandkanten sobald als möglich vorzunehmen, beispielsweise vor dem Aufwickeln des Bandes, das auf dessen Guss folgt. Wenn in diesem Stadium die Kanten wesentlich wärmer als der Rest des Bandes sind, besteht jedoch die Gefahr, dass sie mechanische Eigenschaften aufweisen, die sie weniger dazu befähigen, von dem Band durch die Schere völlig getrennt zu werden, insbesondere wenn die Breite der warmen Zone nicht genau mit der Breite der Kanten, die beschnitten werden sollen, übereinstimmt. Dieses Problem kann verstärkt werden, wenn in einer Linie ein Warmwalzen des Bandes vor dem Besäumen seiner Kanten vorgenommen wird. Diesem Warmwalzen geht nämlich oft ein Schritt der Wiedererwärmung des Bandes in einem Induktionsofen voraus. Bei dieser Wiedererwärmung neigen die Feldlinien dazu, sich auf die Kanten der Bänder zu konzentrieren, was zu Temperaturen an den Kanten führt, die höher sind als die Temperaturen, die am restlichen Band vorherrschen. Diese Inhomogenität bleibt nach dem Warmwalzen bestehen und macht ein korrektes Besäumen der Bandkanten anschließend schwierig.In principle, it is advantageous to trim the band edges as soon as possible make, for example, before winding the tape on the casting follows. If at this stage the edges are much warmer than the rest of the tape However, there is a risk that they have mechanical properties that they enable less to be completely separated from the tape by the scissors especially if the width of the warm zone is not exactly equal to the width of the Edges to be clipped match. This problem can be amplified when hot rolling the strip in one line before trimming its Edges is made. This hot rolling is often a step of Reheating the strip in an induction oven ahead. At this Reheating, the field lines tend to focus on the edges of the tapes concentrate, which leads to temperatures at the edges that are higher than that Temperatures that prevail over the rest of the band. This inhomogeneity lags behind The hot rolling and makes a correct trimming the strip edges difficult afterwards.

Ziel der Erfindung ist es, ein Verfahren und eine Vorrichtung vorzuschlagen, die es ermöglichen, ein zufriedenstellendes Besäumen der Bandkanten durchzuführen, auch wenn die Bandkanten zu Beginn eine höhere Temperatur aufweisen, als dies wünschenswert ist.The aim of the invention is to propose a method and a device which it allow to perform a satisfactory trimming of the band edges, too if the strip edges are initially at a higher temperature than this is desirable.

Zu diesem Zweck betrifft die Erfindung ein Verfahren zur Herstellung eines Metallbandes aus einem direkt aus Flüssigmetall gegossenen Band, bei dem ein Besäumen der Bandkanten vorgenommen wird, dadurch gekennzeichnet, dass die Bandkanten vor dem Besäumen auf gesteuerte Weise abgekühlt werden, um sie brüchiger als den Rest des Bandes zu machen.For this purpose, the invention relates to a method for producing a Metal band of a cast directly from liquid metal band, in which a Trimming the band edges is made, characterized in that the Band edges are cooled in a controlled manner before trimming to them more brittle than the rest of the band.

Dieses Metall kann Stahl sein, und die Abkühlung der Bandkanten beginnt in diesem Fall bei einer Temperatur von 950 bis 1100 °C.This metal can be steel, and the cooling of the strip edges begins in this Fall at a temperature of 950 to 1100 ° C.

Vorzugsweise wird das Beschneiden der Bandkanten sofort nach deren gesteuertem Abkühlen vorgenommen.Preferably, the trimming of the strip edges immediately after the controlled Cooling down.

Das Besäumen der Bandkanten kann vor einem Aufwickeln des Bandes vorgenommen werden.The trimming of the strip edges can be done before winding the tape become.

Das gesteuerte Abkühlen der Bandkanten kann nach einem Warmwalzen des Bandes vorgenommen werden, dem selbst eine Wiedererwärmung des Bandes durch induktive Aufheizung vorausgeht. Controlled cooling of the strip edges may occur after hot rolling of the strip the rewarming of the tape by inductive Heating up precedes.

Vorzugsweise erfolgt die gesteuerte Abkühlung der Bandkanten in-line mit dem Gießen des Bandes.Preferably, the controlled cooling of the strip edges takes place in-line with the casting of the band.

Die Erfindung betrifft auch eine Anlage zur Bearbeitung dünner Metallbänder, die von einer Anlage zum Gießen von dünnen Bändern direkt aus Flüssigmetall kommen, und die eine Anlage zum Besäumen der Bandkanten umfasst, dadurch gekennzeichnet, dass eine Anlage zum gesteuerten ausschließlichen oder bevorzugten Abkühlen der Bandkanten des Bandes einer Anlage zum Besäumen der Bandkanten voransgeht.The invention also relates to a system for processing thin metal bands, which a system for casting thin strips directly from liquid metal, and comprising a system for trimming the strip edges, characterized in that a system for controlled exclusive or preferred cooling of the strip edges of the tape of a system for Trimming the band edges goes on.

Die Anlage zum gesteuerten Abkühlen der Bandkanten des Bandes kann auf derselben Bearbeitungstraße wie die Gießanlage für dünne Bänder angeordnet sein.The system for controlled cooling of the band edges of the tape can on the same processing line as the casting machine for thin strips.

Die Anlage zum gesteuerten Abkühlen der Kanten kann Rampen mit Spritzdüsen umfassen, die jeweils einen Kühlfluidstrahl auf eine Seite einer Bandkante richten.The system for controlled cooling of the edges can be ramps with spray nozzles each directing a cooling fluid jet to one side of a belt edge.

Die Rampen können über und unter dem Band angeordnet sein, und die Spritzdüsen richten die Strahlen auf die Außenseite des Bandes.The ramps can be located above and below the belt, and the spray nozzles direct the rays to the outside of the band.

Die Rampen können seitlich des Bandes angeordnet sein, die Spritzdüsen richten die Strahlen auf die Schmalseite des Bandes, und die Anlage zum gesteuerten Abkühlen der Kanten umfasst auch Sperren, die in gleitendem Kontakt mit der Bandoberfläche stehen und jeweils einen Abschnitt der Breite der Bandkanten begrenzen, welcher den Wirkbereich des Kühlfluids darstellt.The ramps can be arranged laterally of the belt, the spray nozzles direct the Blasting on the narrow side of the belt, and the system for controlled cooling The edges also include barriers that are in sliding contact with the belt surface and each defining a portion of the width of the band edges, which the Effective range of the cooling fluid represents.

Wie erklärt wurde, besteht die Erfindung darin, die Kanten des Bandes vor deren Beschneiden stark abzukühlen. Dieses Abkühlen erfolgt durch Aufspritzen eines Fluids auf eine Breite, die der Breite des zu beschneidenden Bereichs entspricht.As has been explained, the invention consists in placing the edges of the tape in front of them Pruning strongly cool. This cooling is done by spraying a fluid to a width equal to the width of the area to be cropped.

Die Erfindung wird durch Studie der nachfolgenden, die Erfindung nicht einschränkenden Beschreibung besser verständlich, welche sich auf die folgenden beiliegenden Figuren bezieht, wobei:

  • Figur 1 schematisch in Perspektive (Figur 1 a) eine Stranggießanlage für dünne Bänder zeigt, die mit einer Vorrichtung zum Besäumen der Bandkanten versehen ist, vor der eine Anlage zum Abkühlen der Bandkanten (Figur 1b) angeordnet ist;
  • Figur 2 eine Variante der Anlage zum Abkühlen der Bandkanten zeigt.
The invention will be better understood by a study of the following description, which does not limit the invention, which refers to the following attached figures, wherein:
  • Figure 1 shows schematically in perspective (Figure 1 a) a continuous casting for thin strips, which is provided with a device for trimming the strip edges, in front of which a system for cooling the strip edges (Figure 1b) is arranged;
  • Figure 2 shows a variant of the system for cooling the strip edges.

Das Beispiel einer Gießanlage für Bänder aus Metall, insbesondere aus Stahl, das in Figur 1a dargestellt ist, umfasst herkömmlicherweise zwei Gießwalzen 1, 1', die innen gekühlt und in entgegengesetzte Richtung um ihre Achsen in horizontaler Stellung drehangetrieben werden. Seitliche Verschlusswände 2, 2', die zwischen die flachen Stirnseiten 3, 3' der Walzen 1, 1' angelegt werden, begrenzen mit den Seitenwänden der Walzen 1, 1' einen Gießraum, in den kontinuierlich Flüssigstahl durch nicht dargestellte Mittel wie beispielsweise durch ein feuerfestes Rohr, das mit einem Verteiler verbunden ist, gegossen wird. Auf diese Weise werden die Verfestigung und die Entnahme entlang der Pfeile 5 eines Bandes 6 mit einer Dicke von im Allgemeinen 1 bis 10 mm erzielt.The example of a casting plant for strips of metal, in particular of steel, in 1a, conventionally comprises two casting rolls 1, 1 'which are inside cooled and in the opposite direction about their axes in a horizontal position be driven in rotation. Lateral closure walls 2, 2 ', which are between the flat End faces 3, 3 'of the rollers 1, 1' are applied, limit with the side walls the rollers 1, 1 'a casting room, in the continuous liquid steel by not shown means such as by a refractory tube, with a Distributor is connected, is poured. In this way, the solidification and the removal along the arrows 5 of a band 6 with a thickness of in general 1 to 10 mm achieved.

In dem dargestellten Beispiel durchläuft das Band 6 auf bekannte Weise einen Induktionsofen 7, der dazu bestimmt ist, es vor seinem Eintritt in ein Warmwalzgerüst 8, das die Dicke des Bandes 6 beispielsweise um 10% oder mehr verringert, wieder zu erwärmen.In the illustrated example, the belt 6 passes through in a known manner Induction furnace 7, which is destined to be before it enters a hot rolling stand 8, which reduces the thickness of the belt 6 by, for example, 10% or more heat.

Erfindungsgemäß werden die Bandkanten 9, 9' des Bandes 6 sodann einem starken gesteuerten Abkühlen unterzogen, während sich der Rest des Bandes 6 weiterhin natürlich oder unter der Einwirkung einer wesentlich gemäßigter gesteuerten Abkühlung abkühlt.According to the invention, the band edges 9, 9 'of the band 6 then become strong subjected to controlled cooling, while the rest of the belt 6 continue naturally or under the influence of a much more moderate controlled Cooling cools down.

Unter "Bandkanten" 9, 9' des Bandes 6 sind Abschnitte zu verstehen, die sich jeweils von einem der Ränder des Bandes 6 auf einer Breite erstrecken, die 25 mm erreichen kann, und die sodann in einem Schritt, der dem Kaltwalzen des Bandes 6 vorausgeht, beschnitten bzw. besäumt werden.By "band edge" 9, 9 'of the band 6 are sections to be understood, each extending from one of the edges of the band 6 on a width that reach 25 mm can, and then in a step preceding the cold rolling of the belt 6, be trimmed or trimmed.

In dem dargestellten Beispiel erfolgt dieses Besäumen sofort nach dem gesteuerten Abkühlen und vor einem Aufwickeln des Bandes 6. In the example shown, this trimming is done immediately after the controlled Cooling and before winding the tape 6.

In dem Beispiel der Figur 1 wird die Anlage zum gesteuerten Abkühlen von Rampen 10, 10', 10" gebildet, die Spritzdüsen umfassen, die jeweils einen Strahl 11 eines Kühlfluids auf das Band 6 richten. Dieses Fluid kann auf bekannte Weise Wasser, ein Wasser-Luft-Gemisch, Luft, flüssiger Stickstoff usw. sein, sofern es in ausreichender Menge aufgespritzt wird, um die gewünschte Abkühlwirkung an den Bandkanten 9, 9' des Bandes 6 zu erzielen. Die Rampen 10, 10', 10" sind vorzugsweise über und unter jeder Bandkante 9, 9' vorhanden, um beide Seiten jeder Kante abzukühlen. Streng genommen ist, um eine gleiche Abkühlung auf beiden Seiten jeder Bandkante zu erzielen, die Tatsache zu berücksichtigen, dass das Kühlfluid auf der Oberseite über den Eintreffbereich des Strahls 11, der von einer gegebenen Spritzdüse kommt, ablaufen kann, während ein solches Ablaufen auf der Unterseite des Bandes 6 wesentlich begrenzter ist. Wenn eine genau symmetrische Abkühlung der Bandkanten 9, 9' auf beiden Seiten des Bandes 6 erzielt werden soll, muss somit dieses Phänomen ausgeglichen werden, indem beispielsweise mehr Kühlfluid auf die Unterseite des Bandes gespritzt wird. Dieses Phänomen ist im herkömmlichen Strangguss bekannt, und der Fachmann kann mit Hilfe seiner normalen Kenntnisse und der mathematischen Modelle für das Abkühlen des Bandes, die er für den besonderen Fall seiner Gießanlage zur Verfügung hat, Abhilfe schaffen.In the example of Figure 1, the system is used for controlled cooling of ramps 10, 10 ', 10 "formed, the spray nozzles, each having a beam 11 of a Direct cooling fluids to the belt 6. This fluid can in a known manner, a water Water-air mixture, air, liquid nitrogen, etc., if it is in sufficient Amount is sprayed to the desired cooling effect at the band edges 9, 9 ' to achieve the band 6. The ramps 10, 10 ', 10 "are preferably above and below Each belt edge 9, 9 'is provided to cool both sides of each edge. Strict is taken to equal cooling on both sides of each band edge to take into account the fact that the cooling fluid is on top over the area of incidence of the jet 11 coming from a given spray nozzle, can run off while such a run on the bottom of the belt 6 is much more limited. If an exactly symmetrical cooling of the band edges 9, 9 'is to be achieved on both sides of the belt 6, thus this phenomenon be compensated by, for example, more cooling fluid on the underside of the Bandes is injected. This phenomenon is known in conventional continuous casting, and the professional can with the help of his normal knowledge and the mathematical models for cooling the tape, which he used for the particular case his casting machine has available, remedy.

In dem in Figur 1 dargestellten Beispiel spritzen die Rampen 10, 10', 10" Fluidstrahlen 11, die außen auf das Band 6 gerichtet sind. Auf diese Weise läuft das Fluid nicht zu dem zentralen Bereich des Bandes 6 ab, dessen Abkühlung somit natürlich fortgesetzt wird. Auf diese Weise wird die Wirkung der Abkühlung an den Bandkanten 9, 9', die durch punktierte Linien 12, 12' begrenzt sind, eingeschränkt. Diese Einschränkung der Lokalisierung der Abkühlwirkung kann ergänzt werden, indem der gesamte oder ein Teil des zentralen Bereichs des Bandes 6, der nicht abgekühlt werden soll, mit einer oder mehreren Kappen abgedeckt wird, wobei diese Kappe(n) in einem geringen Abstand zur Oberfläche des Bandes 6 gehalten werden.In the example shown in FIG. 1, the ramps 10, 10 ', 10 "inject fluid jets 11, which are directed outside on the belt 6. In this way the fluid does not run the central region of the belt 6, the cooling of course thus continued becomes. In this way, the effect of cooling at the strip edges 9, 9 ', the are limited by dotted lines 12, 12 'limited. This limitation of Localization of the cooling effect can be supplemented by the whole or one Part of the central area of the belt 6, which should not be cooled, with a or more caps is covered, this cap (s) in a small Distance from the surface of the belt 6 are held.

Bei der in Figur 2 dargestellten Variante sind die Rampen 10, 10' an der Seite und nicht über oder unter dem Band 6 angeordnet und spritzen ihre Strahlen 11 des Kühlfluids auf die Schmalseite des Bandes 6. Es wird ein Ablaufen des Fluids zum zentralen Bereich des Bandes vermieden, indem in gleitendem Kontakt mit der Oberfläche desselben eine Sperre 13, 13' angeordnet ist, die den Wirkbereich des Kühlfluids stark auf einen Abschnitt 14, 14' der Länge der Bandkanten 9, 9' begrenzt. Diese Lösung bietet im Vergleich mit der vorhergehenden den Vorteil, dass die Oberfläche des zentralen Bereichs weiter frei bleibt, wodurch seine Beobachtung einfacher ist. Ferner befinden sich die Rampen 10, 10' somit in einem Abstand zu der von dem Band 6 ausgehenden Strahlung, und es sind somit keine komplexen Mittel zum Schutz oder Abkühlen erforderlich, um deren Beeinträchtigung zu vermeiden.In the variant shown in Figure 2, the ramps 10, 10 'on the side and not arranged above or below the band 6 and inject their rays 11 of the Cooling fluid on the narrow side of the belt 6. It is a drainage of the fluid to avoided central area of the tape by sliding in contact with the The surface thereof a barrier 13, 13 'is arranged, which is the effective range of Cooling fluid strongly on a portion 14, 14 'of the length of the band edges 9, 9 limited'. This solution offers the advantage over the previous one that the Surface of the central area remains free, causing his observation is easier. Furthermore, the ramps 10, 10 'are thus at a distance from the radiation emanating from the band 6 and thus are not complex means necessary for protection or cooling to avoid their impairment.

Nach der Anlage zum Abkühlen der Kanten, die soeben beschrieben wurde, durchläuft das Band eine Anlage zum Besäumen der Bandkanten, die durch Kreissägen 15, 15' dargestellt sind und bevorzugt von Kreismesserscheren gebildet sind, wobei natürlich jede bekannte Vorrichtung, die diese Funktion am ablaufenden Band 6 gewährleisten kann, verwendet werden kann. Solche Vorrichtungen sind allgemein bekannt und werden insbesondere in Walzstraßen verwendet. Sodann wird das Band 6 in Form eines Bundes 16 um einen in Drehung befindlichen Haspeldorn 17 aufgewickelt. Die gewickelte Bund kann sodann zu der Anlage befördert werden, die die Weiterbehandlung des Bandes 6 gewährleistet, beispielsweise ein Kaltwalzen, ein Ausglühen-Beizen, das einem Kaltwalzen vorausgeht, usw.After the system for cooling the edges, which has just been described, goes through the belt a system for trimming the band edges, which by circular saws 15, 15 ' are shown and are preferably formed by circular knife scissors, of course any known device that ensure this function on the expiring belt 6 can, can be used. Such devices are well known and are used in particular in rolling mills. Then, the band 6 in the form a collar 16 wound around a coiling mandrel 17 in rotation. The wound coil can then be transported to the plant, which the Further treatment of the belt 6 ensures, for example, a cold rolling, a Annealing pickling, which precedes cold rolling, etc.

Durch das beschleunigte Abkühlen der Bandkanten 9, 9' soll diesen eine metallurgische Struktur verliehen werden, die eine deutliche Veränderung im Vergleich mit der Struktur des Restes des Bandes 6 darstellt, wobei diese Veränderung in Richtung einer größeren Kohäsion des Metalls geht. Die Anlage zum Besäumen der Bandkanten benötigt mehr Aufwand, um ein Schneiden auf diesem Niveau durchzuführen, als wenn die mechanischen Eigenschaften des Bandes 6 über seine gesamte Breite im Wesentlichen homogen wären. Dieser Mehraufwand führt jedoch zu einem sauberen Schnitt, der kein späteres Entgraten erfordert.Due to the accelerated cooling of the band edges 9, 9 'this is a metallurgical structure can be awarded, which is a significant change in comparison with the structure of the remainder of the band 6, this change in Towards a greater cohesion of the metal. The plant for trimming the Band edges require more effort to cut at this level perform as if the mechanical properties of the band 6 on his entire width would be substantially homogeneous. However, this additional expenditure leads to a clean cut that does not require any subsequent deburring.

Die erfindungsgemäße Anlage zum Abkühlen der Bandanten eines dünnen Bandes, das durch Stranggießen hergestellt wurde, ist nicht unbedingt in-line mit der Gießanlage angeordnet. Sie kann an jeder Stelle der Herstellungskette angeordnet sein, an der die Temperatur des Bandes größer als 950°C ist, so dass die gewünschte metallurgische Wirkung für diese Abkühlung erzielt wird. Es ist überdies nicht immer erforderlich, dass die Anlage 15, 15' zum Beschneiden der Bandkanten 9, 9' sofort auf die erfindungsgemäße Anlage zum Abkühlen folgt, außer wenn dieses Abkühlen insofern nicht wirksam war, als die Gefahr besteht, dass der Bruch der Bandkanten 9, 9' spontan während der Bearbeitung des Bandes 6 vor dem Beschneiden der Bandkanten 9, 9' auftreten kann. Ein solcher unkontrollierbarer spontaner Bruch kann Gefahren für das Personal und die Ausrüstung mit sich bringen, wenn er an einer Stelle auftritt, die nicht dazu vorgesehen ist, die geschnittenen Bandkanten 9, 9' aufzunehmen. Ein weiterer Vorteil der direkten Aneinanderreihung des Abkühlens und Beschneidens besteht darin, dass die Bandkanten 9, 9' somit nicht die Zeit haben, unter der Einwirkung der Wärme, die vom Rest des Bandes 6 kommt, wieder Temperatur anzunehmen. Ein solches erneutes Annehmen von Temperatur wäre in der Lage, die Kanten 9, 9' zu einer metallurgischen Struktur und mechanischen Eigenschaften zurückzuführen, die dem Rest des Bandes 6 ähnlicher sind, wodurch die Wirkung des Abkühlens der Kanten und der Schnittqualität verringert würde.The system according to the invention for cooling the band edges of a thin strip, that was made by continuous casting is not necessarily in-line with the Casting plant arranged. It can be arranged at any point in the production chain be, where the temperature of the belt is greater than 950 ° C, so that the desired metallurgical effect is achieved for this cooling. It's not always required that the system 15, 15 'for trimming the strip edges 9, 9' immediately on the cooling system according to the invention follows, unless this cooling was not effective insofar as there is a risk that the breakage of the strip edges 9, 9 'spontaneously while editing the tape 6 before trimming the Band edges 9, 9 'may occur. Such an uncontrollable spontaneous break can Dangers to the personnel and the equipment when he is at one Position occurs that is not intended to accommodate the cut strip edges 9, 9 '. Another advantage of the direct juxtaposition of cooling and Pruning is that the band edges 9, 9 'thus do not have the time under the action of the heat that comes from the rest of the belt 6 again Temperature to accept. Such a reassessment of temperature would be in capable of forming the edges 9, 9 'into a metallurgical structure and mechanical Properties that are more similar to the rest of Band 6, thereby the effect of cooling the edges and cutting quality would be reduced.

Als Variante kann der Schritt des Abkühlens der Bandanten 9, 9' mit einem Schritt des gesteuerten Abkühlens des gesamten Bandes 6 aus metallurgischen Gründen zusammenfallen. Während dieses Schritts ist nun eine wesentlich stärkere Abkühlung an den Bandkanten 9, 9' als am Rest des Bandes 6 vorzunehmen, um die Erfindung einzusetzen. Es erfolgt somit auf diese Weise nicht mehr eine ausschließliche Abkühlung, sondern nur eine bevorzugte Abkühlung der Bandkanten 9, 9'.As a variant, the step of cooling the band edges 9, 9 'with a step of controlled cooling of the entire band 6 for metallurgical reasons coincide. During this step is now a much stronger cooling at the strip edges 9, 9 'than at the remainder of the strip 6, around the invention use. It is thus no longer an exclusive in this way Cooling, but only a preferred cooling of the band edges 9, 9 '.

Der soeben beschriebene Fall ergibt sich bei einem zwischen Walzen gegossenen Band 6, jedoch es versteht sich, dass die Erfindung auch dann anwendbar ist, wenn das dünne Band 6 durch ein anderes Verfahren gegossen wurde. Das erfindungsgemäße Verfahren ist auch auf andere Metalle als Stahl anwendbar, wenn diese in der Lage sind, direkt zu einem dünnen Band gegossen zu werden, wie beispielsweise Aluminium, Kupfer und ihre Legierungen.The case just described results in a cast between rolls Volume 6, but it is understood that the invention is applicable even if the thin band 6 was cast by another method. The method according to the invention is also applicable to metals other than steel, if these are able to be poured directly into a thin band, like For example, aluminum, copper and their alloys.

Claims (11)

  1. Process for producing a metal strip from a strip (6) which is cast directly from liquid metal (4) and the strip edges (9, 9') of which are trimmed, characterized in that the strip edges (9, 9') are cooled in a controlled way, in order to make them more brittle than the remainder of the strip (6), before being trimmed.
  2. Process according to Claim 1, characterized in that the metal is steel and the cooling of the strip edges (9, 9') begins at a temperature of from 950 to 1100°C.
  3. Process according to Claim 1 or 2, characterized in that the strip edges (9, 9') are trimmed immediately after the controlled cooling thereof.
  4. Process according to one of Claims 1 to 3, characterized in that the strip edges (9, 9') are trimmed before the strip (6) is coiled.
  5. Process according to one of Claims 1 to 4, characterized in that the controlled cooling of the strip edges (9, 9') is carried out after hot-rolling of the strip (6), which is preceded by reheating of the strip (6) by inductive heating.
  6. Process according to one of Claims 1 to 5, characterized in that the controlled cooling of the strip edges (9, 9') is carried out in-line with the casting of the strip (6).
  7. Installation for processing a thin metal strip (6) which comes from an installation for casting thin strips directly from liquid metal, and which comprises an installation (15, 15') for trimming the strip edges (9, 9'), characterized in that an installation for the exclusive or preferential controlled cooling of the strip edges (9, 9') of the strip (6) precedes an installation (15, 15') for trimming the strip edges (9, 9').
  8. Installation according to Claim 7, characterized in that the installation for the controlled cooling of the strip edges (9, 9') of the strip (6) is arranged on the same processing line as the casting installation for thin strips.
  9. Installation according to one of Claims 7 or 8, characterized in that the installation for the controlled cooling of the strip edges (9, 9') comprises ramps (10, 10', 10'') with spray nozzles which each direct a jet (11) of a cooling fluid onto one side of a strip edge (9, 9') of the strip (6).
  10. Installation according to Claim 9, characterized in that the ramps (10, 10', 10'') are arranged above and below the strip (6), and in that the spray nozzles direct the jets (11) onto the outer side of the strip (6).
  11. Installation according to Claim 9, characterized in that the ramps (10, 10', 10") are arranged at the sides of the strip (6), in that the spray nozzles direct the jets (11) onto the narrow sides of the strip (6), and in that the installation for the controlled cooling of the strip edges (9, 9') also comprises barriers (13, 13') which are in sliding contact with the surface of the strip (6) and each delimit a section (14, 14') of the width of the strip edges (9, 9') of the strip (6) which constitutes the area of action of the cooling fluid.
EP02793060A 2001-12-20 2002-12-18 Method and device for the production of a trimmed metal strip Expired - Lifetime EP1455975B1 (en)

Applications Claiming Priority (3)

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FR0116601 2001-12-20
FR0116601A FR2833871B1 (en) 2001-12-20 2001-12-20 METHOD AND PLANT FOR MANUFACTURING METAL STRIPS FROM STRIPS CAST DIRECTLY FROM LIQUID METAL
PCT/EP2002/014467 WO2003053612A1 (en) 2001-12-20 2002-12-18 Method and device for the production of a trimmed metal strip

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EP1455975B1 true EP1455975B1 (en) 2005-12-07

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EP (1) EP1455975B1 (en)
KR (1) KR20040063177A (en)
CN (1) CN1319678C (en)
AT (1) ATE311951T1 (en)
AU (1) AU2002358748B2 (en)
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US20050108868A1 (en) 2005-05-26
FR2833871A1 (en) 2003-06-27
WO2003053612A1 (en) 2003-07-03
EP1455975A1 (en) 2004-09-15
DE50205229D1 (en) 2006-01-12
FR2833871B1 (en) 2004-07-09
AU2002358748A1 (en) 2003-07-09
AU2002358748B2 (en) 2007-05-24
MXPA04006043A (en) 2004-09-27
CN1319678C (en) 2007-06-06
KR20040063177A (en) 2004-07-12
US7367104B2 (en) 2008-05-06
CN1630568A (en) 2005-06-22
ATE311951T1 (en) 2005-12-15

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