EP2869945B1 - Continuously operating casting and rolling system - Google Patents

Continuously operating casting and rolling system Download PDF

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Publication number
EP2869945B1
EP2869945B1 EP13765617.9A EP13765617A EP2869945B1 EP 2869945 B1 EP2869945 B1 EP 2869945B1 EP 13765617 A EP13765617 A EP 13765617A EP 2869945 B1 EP2869945 B1 EP 2869945B1
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European Patent Office
Prior art keywords
unit
casting
strip
rolling
rollers
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EP13765617.9A
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German (de)
French (fr)
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EP2869945A2 (en
Inventor
Hellfried Eichholz
Karl-Heinz Spitzer
Sven Klawiter
Rune SCHMIDT-JÜRGENSEN
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SMS Group GmbH
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SMS Group GmbH
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Priority to PL13765617T priority Critical patent/PL2869945T3/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
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/041—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for vertical casting
    • 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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0631—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by a travelling straight surface, e.g. through-like moulds, a belt
    • 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
    • B22D11/14—Plants for continuous casting
    • B22D11/143—Plants for continuous casting for horizontal casting

Definitions

  • the invention relates to a continuous strip casting and rolling plant according to the preamble of claim 1.
  • the invention relates to a strip casting and rolling plant, as they are known from DE 102007056191 A1 is known.
  • a continuous strip casting and rolling plant is z. B, from steel research 74 (2003), No, 11/12, page 724-731.
  • this known as DSC process (direct strip casting) manufacturing process is suitable for the production of hot strip of high manganese lightweight steel.
  • the melt from a feed vessel via a runner and a siphon-like design as a pouring nozzle outlet region of a casting machine is placed on a revolving casting belt a horizontal strip casting.
  • the abandoned melt solidifies to a pre-strip with a thickness in the range between 6 - 20 mm. After solidification, the pre-strip is subjected to a hot rolling process.
  • the casting, rolling and winding of the steel strip requires the strip caster to carry out the removal of the cast strand from the casting machine with very little tensile force, ideally with a zero draw force.
  • the known high manganese-containing lightweight steels tend even at slight tensile stresses, especially if the band is not solidified, to tape breaks, this leads to plant downtime and increased repair costs.
  • strip tension regulations for continuous rolling mills for example, from DE 101 37 246 A1 or the DE 26 18 901 C2 known.
  • these designed for continuous rolling mills devices for tension control are not sufficient to control the strip tension between the casting unit and the subsequent roller unit so and keep it at a low level that tape cracks can be safely avoided.
  • the object of the invention is to provide a continuous strip casting and rolling plant, can be safely avoided with the tape cracks.
  • the stripper minimization, the casting unit and the following roller unit are mechanically decoupled, wherein for decoupling at least one at least two drivable rollers having drive unit for driving the belt between the casting belt and roller unit is arranged.
  • the strip casting and rolling plant according to the invention is fundamentally suitable for the production of hot strips of the most diverse metallic materials, but in particular for high manganese-containing lightweight structural steel, which reacts very sensitively to excessive strip tensile stresses.
  • the operating times and thus the efficiency of the strip casting can be significantly increased by the decoupling and strip tension control according to the invention and thus the maintenance costs for the strip casting can be significantly reduced.
  • a decoupling of driver unit and roller unit is additionally carried out.
  • a pneumatically operated working as a looper spring unit is used for decoupling.
  • the driver unit according to the invention is rotatably mounted eccentrically, wherein the rollers of the driver unit are displaceable substantially parallel to the strand normal during the casting and rolling process in the casting direction or counter to the casting direction.
  • the bearings can be either below the lower or above the upper roller in the frame of the driver unit.
  • the storage corresponds to a pendulum bearing of the driver unit, the "pendulum" (driver unit) is stored below or above.
  • one or more driver units may be provided, each of which is rotatably mounted eccentrically.
  • the individual driver units with the roller pairs can carry out movements with the storage according to the invention and counter to the casting direction.
  • the driver units are supported according to the invention via load cells (train pressure) against the frame of the Multirollerglättsystems.
  • load cells train pressure
  • the resulting from the force movements with and against the casting direction are limited by the elasticity of the load cells in the measuring range (Hugh range) to a few microns. As a result, no effective movements in the direction of the strand normal are exercised.
  • the upper rollers of the driver units are provided with coats of copper in order to accelerate the cooling at the top of the solidifying strand.
  • FIG. 1 a section of strip casting and rolling plant according to the invention with a strip tension minimizing Bandzugregelung.
  • the strip casting and rolling plant consists of a pouring unit not shown here with a feed vessel containing the melt with a horizontal runner and designed as a pouring spout and a two deflection rollers and a circulating cooled conveyor belt 1 having primary cooling zone and at least one subsequent from at least two drivable rollers existing roller unit 4. Shown here is the deflection roller 2 of the conveyor belt 1 at the transfer side to the roller unit. 4
  • the casting unit (Caster) and the following rolling unit 4 are mechanically decoupled, wherein three driver units 3, 3 ', 3 "with two rollers for driving the cast strip 5 between the conveyor belt 1 and the rolling unit 4 are arranged for decoupling.
  • driver unit 3 3 ', 3 "and roller unit 4
  • a decoupling of driver unit 3, 3 ', 3 "and roller unit 4 is provided, wherein for decoupling a pneumatically operated lifting device 6, as Looper working resilient unit is used.
  • the cast strip 5 is first removed from the conveyor belt 1 at the master speed v0.
  • the exit speed of the belt 5 is measured by a tachometer T0 and the peripheral speed of the driver rollers is synchronized to T0. At this speed, the belt 5 enters the driver units 3, 3 ', 3 "of a multi-roll buffing system.
  • the upper roller After running into the pair of rollers of the first driver unit 3, the upper roller is lowered onto the belt 5 with a defined force. Due to existing unsynchronities between the conveyor belt 1 and pair of rollers, the belt 5 is pulled or braked by the conveyor belt 1. Now, a first regulator engages and adjusts the roller pair speed so that the pair of rollers exerts no pulling or pushing forces on the cast band 5.
  • Unsynchronities can be caused, for example, by different roll diameters (wear), by different setting forces (degree of deformation) or shrinkage due to cooling of the strip.
  • the speed of the second roller pair of the driver unit 3 ' is now adjusted by a further control device so that here is a tensile force of ideally 0N established.
  • the pairs of rollers of the third driver unit 3 "and any further pairs of rollers work analogously to the second pair of rollers.
  • the solidifying belt 5 now exits the driver units 3, 3 ', 3 "of the multi-scroll system and is pulled by a pilot train cold-strand device 7.
  • the last pair of rollers also has a force-measuring device on the drive unit 3".
  • the pilot train cold-strand device 7 also adjusts to a measured tensile force of ON on the last pair of rollers and pulls the belt 5 via the lifting device 6 in the not yet employed roller unit 4. Shown is as a rolling unit 4 only a rolling mill, but it can, depending on Request also be several.
  • the looper bow is set up (Looper lifts) and the nip is closed.
  • the action of the lifting device 6 and the rolling unit 4 on the force measurement on the drive unit 3 "of the last pair of rollers of the multi-roll smoothing system is adjusted by means of a further control device that also here a traction of ON occurs.
  • rollers of the roller unit 4 are placed in an advantageous development on active hydraulic shock absorbers on the strand, so that the influences when immersing the rollers in the band 5 (degree of deformation) are reduced or suppressed.
  • the resulting loop loop gives the rolling speed control sufficient time to correct any unsynchronities.
  • the pilot pulling device 7 already pulls the cast strip 5 with the required force into the first rolling stand of the rolling unit 4, so that no force jumps occur here as well.
  • the contact speed of the rollers is synchronized by means of inlet tachometers prior to placement on the speed of the incoming belt 5. This also prevents interference with the belt 5 is prevented.
  • the looper control can either be force-controlled, height-controlled or designed as a physical looper model.
  • asynchronous motors but also DC motors can be used.
  • DC motors When using asynchronous motors, these are supplied by frequency converters, with each frequency converter containing an internal PID controller.
  • the required tensile force can be specified separately as a setpoint for the pilot train cold-strand device 7 and the tensile force for the rolling unit 4.
  • the multi-scroll smoothness system with the driver units 3, 3 ', 3 " is connected rigidly to the drive of the casting belt 1 by means of superposition transmissions (Ü), whereby very short-term fluctuations in the speed of the cast belt 5 are transferred to the multiroll smoothness system and thus none are produced short-term differential speeds between Band 5 and Multirollenglättsystem with the driver units 3, 3 ', 3 ".
  • Ü superposition transmissions
  • FIG. 2 an alternative control concept is shown. Like reference numerals correspond to like components.
  • the strip tension is measured via another load cell, which is attached to the frame of the casting unit (Castergestell).
  • the force measurement directly indicates the reaction forces of the tensile or shear forces applied to the belt.
  • This measured value is fed to a controller which directly controls the speed of an overlay motor (M).
  • FIG. 3 Another alternative is shown.
  • the reaction force of the Castergestells is measured by force cells individually or as a total force.
  • the caster frame is either on these special force measuring systems or hanging attached to these.
  • the reaction force of the Castergestells is corrected directly to 0N using the superposition drive.
  • FIG. 4 another possible alternative control concept is shown.
  • the role of Tacho T0 is used as Minilooper.
  • the roller is raised a few millimeters above the specified passline.
  • the bending of the cast strip 5 here must be kept low in order to avoid any cracking.
  • this signal is used according to the invention for controlling the superposition gearing (Ü).

Description

Die Erfindung betrifft eine kontinuierlich arbeitende Bandgieß- und Walzanlage gemäß dem Oberbegriff des Anspruches 1.The invention relates to a continuous strip casting and rolling plant according to the preamble of claim 1.

Die Erfindung geht aus von einer Bandgieß- und Walzanlage, wie sie aus der DE 102007056191 A1 bekannt ist.The invention relates to a strip casting and rolling plant, as they are known from DE 102007056191 A1 is known.

Eine kontinuierlich arbeitende Bandgieß- und Walzanlage ist z. B, aus steel research 74 (2003), No, 11/12, page 724 - 731 bekannt. Insbesondere ist dieses als DSC-Verfahren (Direct-Strip-Casting) bekannte Herstellungsverfahren geeignet zur Herstellung von Warmband aus hochmanganhaltigem Leichtbaustahl.A continuous strip casting and rolling plant is z. B, from steel research 74 (2003), No, 11/12, page 724-731. In particular, this known as DSC process (direct strip casting) manufacturing process is suitable for the production of hot strip of high manganese lightweight steel.

Bei diesem bekannten Verfahren wird die Schmelze aus einem Zulaufgefäß über eine Gießrinne und einen siphonartig als Gießdüse ausgebildeten Auslaufbereich einer Gießmaschine auf ein umlaufendes Gießband einer horizontalen Bandgießanlage aufgegeben. Durch intensive Kühlung des Gießbandes erstarrt die aufgegebene Schmelze zu einem Vorband mit einer Dicke im Bereich zwischen 6 - 20 mm. Nach der Durcherstarrung wird das Vorband einem Warmwalzprozess unterzogen.In this known method, the melt from a feed vessel via a runner and a siphon-like design as a pouring nozzle outlet region of a casting machine is placed on a revolving casting belt a horizontal strip casting. By intensive cooling of the casting belt, the abandoned melt solidifies to a pre-strip with a thickness in the range between 6 - 20 mm. After solidification, the pre-strip is subjected to a hot rolling process.

Das Gießen, Walzen und Aufwickeln des Stahlbandes erfordert von der Bandgießanlage, dass die Abnahme des gegossenen Stranges von der Gießmaschine mit sehr geringer Zugkraft, idealerweise mit einer Nullzugkraft, durchgeführt wird. Insbesondere neigen die bekannten hochmanganhaltigen Leichtbaustähle schon bei geringfügigen Bandzugspannungen, vor allem wenn das Band noch nicht durcherstarrt ist, zu Bandrissen, dies führt zu Anlagenstillstand und erhöhtem Reparaturaufwand.The casting, rolling and winding of the steel strip requires the strip caster to carry out the removal of the cast strand from the casting machine with very little tensile force, ideally with a zero draw force. In particular, the known high manganese-containing lightweight steels tend even at slight tensile stresses, especially if the band is not solidified, to tape breaks, this leads to plant downtime and increased repair costs.

Allgemein sind Bandzugregelungen für kontinuierlich arbeitende Walzstraßen beispielsweise aus der DE 101 37 246 A1 oder der DE 26 18 901 C2 bekannt. Diese für kontinuierlich arbeitende Walzstraßen ausgelegten Vorrichtungen zur Bandzugregelung reichen jedoch nicht aus, den Bandzug zwischen Gießeinheit und der nachfolgenden Walzeinheit so zu steuern und auf so geringem Niveau zu halten, dass Bandrisse sicher vermieden werden können.In general, strip tension regulations for continuous rolling mills, for example, from DE 101 37 246 A1 or the DE 26 18 901 C2 known. However, these designed for continuous rolling mills devices for tension control are not sufficient to control the strip tension between the casting unit and the subsequent roller unit so and keep it at a low level that tape cracks can be safely avoided.

Aufgabe der Erfindung ist es, eine kontinuierlich arbeitende Bandgieß- und Walzanlage anzugeben, mit der Bandrisse sicher vermieden werden können.The object of the invention is to provide a continuous strip casting and rolling plant, can be safely avoided with the tape cracks.

Diese Aufgabe wird ausgehend vom Oberbegriff in Verbindung mit den kennzeichnenden Merkmalen des Anspruches 1 gelöst. Vorteilhafte Weiterbildungen sowie eine Vorrichtung zum Erzeugen von Warmbändern sind Gegenstand von Unteransprüchen.This object is achieved starting from the preamble in conjunction with the characterizing features of claim 1. Advantageous developments and an apparatus for producing hot strips are the subject of dependent claims.

Nach der Lehre der Erfindung sind zur Bandzugminimierung, die Gießeinheit und die nachfolgende Walzeinheit mechanisch entkoppelt, wobei zur Entkopplung mindestens eine mindestens zwei antreibbare Rollen aufweisende Treibereinheit zum Antreiben des Bandes zwischen Gießband und Walzeinheit angeordnet ist.According to the teachings of the invention, the stripper minimization, the casting unit and the following roller unit are mechanically decoupled, wherein for decoupling at least one at least two drivable rollers having drive unit for driving the belt between the casting belt and roller unit is arranged.

Die erfindungsgemäße Bandgieß- und Walzanlage ist grundsätzlich für die Erzeugung von Warmbändern aus den verschiedensten metallischen Werkstoffen geeignet, insbesondere jedoch für hochmanganhaltigen Leichtbaustahl, der sehr empfindlich auf zu hohe Bandzugspannungen reagiert.The strip casting and rolling plant according to the invention is fundamentally suitable for the production of hot strips of the most diverse metallic materials, but in particular for high manganese-containing lightweight structural steel, which reacts very sensitively to excessive strip tensile stresses.

Versuche zeigten, dass nur durch die erfindungsgemäße Entkopplung der Gießeinheit von der nachfolgenden Walzeinheit, der Bandzug wirksam geregelt und auf sehr niedrigem Niveau gehalten werden kann.Experiments showed that only by the inventive decoupling of the casting unit of the following rolling unit, the strip tension can be effectively controlled and kept at a very low level.

Die Betriebszeiten und damit die Wirtschaftlichkeit der Bandgießanlage können durch die erfindungsgemäße Entkopplung und Bandzugregelung deutlich gesteigert und damit die Instandhaltungskosten für die Bandgießanlage deutlich gesenkt werden.The operating times and thus the efficiency of the strip casting can be significantly increased by the decoupling and strip tension control according to the invention and thus the maintenance costs for the strip casting can be significantly reduced.

In einer weiteren Ausgestaltung der Erfindung wird zusätzlich eine Entkopplung von Treibereinheit und Walzeinheit vorgenommen. Hierbei wird zur Entkopplung vorteilhaft eine pneumatisch betriebene als Looper arbeitende federnde Einheit eingesetzt.In a further embodiment of the invention, a decoupling of driver unit and roller unit is additionally carried out. Here, for decoupling advantageously a pneumatically operated working as a looper spring unit is used.

Die Treibereinheit ist erfindungsgemäß exzentrisch drehgelagert, wobei die Rollen der Treibereinheit im Wesentlichen parallel zur Strangnormalen während des Gieß- und Walzvorgangs in Gießrichtung oder entgegen der Gießrichtung versetzbar sind.The driver unit according to the invention is rotatably mounted eccentrically, wherein the rollers of the driver unit are displaceable substantially parallel to the strand normal during the casting and rolling process in the casting direction or counter to the casting direction.

Die Lagerstellen können entweder unterhalb der unteren oder oberhalb der oberen Rolle im Gestell der Treibereinheit liegen. Die Lagerung entspricht dabei einer Pendellagerung der Treibereinheit, wobei das "Pendel" (Treibereinheit) unten oder oben gelagert ist.The bearings can be either below the lower or above the upper roller in the frame of the driver unit. The storage corresponds to a pendulum bearing of the driver unit, the "pendulum" (driver unit) is stored below or above.

Je nach Auslegung der Bandgieß- und Walzanlage können eine oder auch mehrere Treibereinheiten vorgesehen werden, die jeweils exzentrisch drehgelagert sind.Depending on the design of the strip casting and rolling plant, one or more driver units may be provided, each of which is rotatably mounted eccentrically.

Die einzelnen Treibereinheiten mit den Rollenpaaren können durch die erfindungsgemäße Lagerung Bewegungen mit- und entgegen der Gießrichtung ausführen. Die Treibereinheiten sind dabei erfindungsgemäß über Kraftmessdosen (Zug-Druck) gegen den Rahmen des Multirollenglättsystems abgestützt. Die aus der Krafteinwirkung resultierenden Bewegungen mit und gegen die Gießrichtung werden durch die Elastizität der Kraftmessdosen im Messbereich (Hughscher Bereich) auf wenige µm begrenzt. Hierdurch werden keine wirksamen Bewegungen in Richtung der Strangnormalen ausgeübt.The individual driver units with the roller pairs can carry out movements with the storage according to the invention and counter to the casting direction. The driver units are supported according to the invention via load cells (train pressure) against the frame of the Multirollerglättsystems. The resulting from the force movements with and against the casting direction are limited by the elasticity of the load cells in the measuring range (Hugh range) to a few microns. As a result, no effective movements in the direction of the strand normal are exercised.

In einer weiteren vorteilhaften Weiterbildung sind insbesondere die oberen Rollen der Treibereinheiten mit Mänteln aus Kupfer versehen, um die Abkühlung an der Oberseite des erstarrenden Stranges zu beschleunigen.In a further advantageous embodiment, in particular the upper rollers of the driver units are provided with coats of copper in order to accelerate the cooling at the top of the solidifying strand.

Weitere Merkmale, Vorteile und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung von in einer Zeichnung dargestellten Ausführungsbeispielen. Es zeigen:

  • Figur 1 ein schematisch ausschnittweise dargestelltes Ausführungsbeispiel einer erfindungsgemäßen Bandgieß- und Walzanlage und einer Bandzugregelung,
  • Figur 21. alternatives Ausführungsbeispiel,
  • Figur 32. alternatives Ausführungsbeispiel,
  • Figur 43. alternatives Ausführungsbeispiel.
Further features, advantages and details of the invention will become apparent from the following description of exemplary embodiments illustrated in a drawing. Show it:
  • FIG. 1 a schematically illustrated in detail embodiment of a strip casting and rolling plant according to the invention and a strip tension control,
  • FIG. 21, alternative embodiment,
  • FIG. 32. alternative embodiment,
  • Figure 43. alternative embodiment.

Einzelheiten der Erfindung sind aus der nachfolgenden Erläuterung eines in der Zeichnung schematisch dargestellten Ausführungsbeispiels ersichtlich. Dargestellt ist in Figur 1 ausschnittweise eine erfindungsgemäße Bandgieß- und Walzanlage mit einer den Bandzug minimierenden Bandzugregelung.Details of the invention will become apparent from the following explanation of an embodiment shown schematically in the drawing. Is shown in FIG. 1 a section of strip casting and rolling plant according to the invention with a strip tension minimizing Bandzugregelung.

In dieser ausschnittweisen Darstellung wird insbesondere der Anlagenbereich "Übergabe gegossenes Band vom Förderband zu den nachfolgenden Aggregaten" dargestellt.In this sectional representation, in particular the plant area "transfer of cast strip from the conveyor belt to the subsequent units" is shown.

Die Bandgieß- und Walzanlage besteht aus einer hier nicht dargestellten Gießeinheit mit einem die Schmelze enthaltenden Zulaufgefäß mit einer horizontal liegenden Gießrinne und einem als Gießdüse ausgebildeten Auslaufbereich und einer zwei Umlenkrollen und ein umlaufendes gekühltes Förderband 1 aufweisenden Primärkühlzone und mindestens einer nachfolgenden aus mindestens zwei antreibbaren Walzen bestehenden Walzeinheit 4. Dargestellt ist hier die Umlenkrolle 2 des Förderbandes 1 an der Übergabeseite zur Walzeinheit 4.The strip casting and rolling plant consists of a pouring unit not shown here with a feed vessel containing the melt with a horizontal runner and designed as a pouring spout and a two deflection rollers and a circulating cooled conveyor belt 1 having primary cooling zone and at least one subsequent from at least two drivable rollers existing roller unit 4. Shown here is the deflection roller 2 of the conveyor belt 1 at the transfer side to the roller unit. 4

Erfindungsgemäß ist die Gießeinheit (Caster) und die nachfolgende Walzeinheit 4 mechanisch entkoppelt, wobei zur Entkopplung drei Treibereinheiten 3, 3', 3" mit je zwei Rollen zum Antreiben des gegossenen Bandes 5 zwischen Förderband 1 und Walzeinheit 4 angeordnet sind.According to the invention, the casting unit (Caster) and the following rolling unit 4 are mechanically decoupled, wherein three driver units 3, 3 ', 3 "with two rollers for driving the cast strip 5 between the conveyor belt 1 and the rolling unit 4 are arranged for decoupling.

Zusätzlich ist eine Entkopplung von Treibereinheit 3, 3', 3" und Walzeinheit 4 vorgesehen, wobei zur Entkopplung eine pneumatisch betriebene Hubeinrichtung 6, als Looper arbeitende federnde Einheit, eingesetzt ist.In addition, a decoupling of driver unit 3, 3 ', 3 "and roller unit 4 is provided, wherein for decoupling a pneumatically operated lifting device 6, as Looper working resilient unit is used.

Die Minimierung des Bandzuges während des kontinuierlichen Bandgieß- und Walzprozesses geschieht mit der dargestellten Regelung wie folgt:The minimization of the strip tension during the continuous strip casting and rolling process is done with the illustrated control as follows:

Das gegossene Band 5 wird zunächst vom Förderband 1 mit der Mastergeschwindigkeit v0 abtransportiert. Die Auslaufgeschwindigkeit des Bandes 5 wird dabei von einem Tacho T0 gemessen und die Umfangsgeschwindigkeit der Treiberrollen wird auf T0 synchronisiert. Mit dieser Geschwindigkeit tritt das Band 5 in die Treibereinheiten 3, 3', 3" eines Multirollenglättsystems ein.The cast strip 5 is first removed from the conveyor belt 1 at the master speed v0. The exit speed of the belt 5 is measured by a tachometer T0 and the peripheral speed of the driver rollers is synchronized to T0. At this speed, the belt 5 enters the driver units 3, 3 ', 3 "of a multi-roll buffing system.

Nach Einlaufen in das Rollenpaar der ersten Treibereinheit 3 wird die obere Rolle mit einer definierten Kraft auf das Band 5 abgesenkt. Durch vorhandene Unsynchronitäten zwischen Förderband 1 und Rollenpaar wird das Band 5 vom Förderband 1 gezogen oder abgebremst. Jetzt greift ein erster Regler ein und stellt die Rollenpaargeschwindigkeit so ein, dass das Rollenpaar keine Zug- bzw. Schubkräfte auf das gegossene Band 5 ausübt.After running into the pair of rollers of the first driver unit 3, the upper roller is lowered onto the belt 5 with a defined force. Due to existing unsynchronities between the conveyor belt 1 and pair of rollers, the belt 5 is pulled or braked by the conveyor belt 1. Now, a first regulator engages and adjusts the roller pair speed so that the pair of rollers exerts no pulling or pushing forces on the cast band 5.

Unsynchronitäten können beispielsweise durch unterschiedliche Rollendurchmesser (Verschleiß), durch unterschiedliche Anstellkräfte (Umformgrad) oder Schrumpfung durch Abkühlung des Bandes verursacht werden.Unsynchronities can be caused, for example, by different roll diameters (wear), by different setting forces (degree of deformation) or shrinkage due to cooling of the strip.

Im folgenden senkt das Rollenpaar der zweiten Treibereinheit 3' auf das Band 5 ab. Auch hier ist wieder eine geringe Unsynchronität in den Geschwindigkeiten vorhanden. Diese Unsynchronität des zweiten Rollenpaares erzeugt an der ersten Treibereinheit 3 des ersten Rollenpaares eine Zug- bzw. Druckkraft. Diese Kraft wird mittels einer Kraftmesseinrichtung gemessen und ausgewertet. Die Treibereinheiten 3, 3', 3" sind dafür in einem Rahmengestell 8 angeordnet, wobei sich die jeweiligen Kraftmesseinrichtungen der Treibereinheiten 3, 3', 3" gegen dieses Rahmengestell 8 abstützen.In the following, the pair of rollers of the second drive unit 3 'lowers onto the belt 5. Again, there is a little unsynchrony in the speeds again. This unsynchronity of the second pair of rollers generates a tensile or compressive force on the first driver unit 3 of the first pair of rollers. This force is measured and evaluated by means of a force measuring device. The driver units 3, 3 ', 3 "are arranged in a frame 8, wherein the respective force measuring devices of the driver units 3, 3', 3" are supported against this frame 8.

Die Geschwindigkeit des zweiten Rollenpaares der Treibereinheit 3' wird jetzt durch eine weitere Regleinrichtung so eingestellt, dass sich hier eine Zugkraft von idealerweise 0N einstellt. Die Rollenpaare der dritten Treibereinheit 3" und alle eventuell weiteren Rollenpaare arbeiten analog zum zweiten Rollenpaar.The speed of the second roller pair of the driver unit 3 'is now adjusted by a further control device so that here is a tensile force of ideally 0N established. The pairs of rollers of the third driver unit 3 "and any further pairs of rollers work analogously to the second pair of rollers.

Das erstarrende Band 5 verlässt jetzt die Treibereinheiten 3, 3', 3" des Multirollenglättsystems und wird von einer Pilotzug-Kaltstrang-Einrichtung 7 gezogen. Das letzte Rollenpaar hat ebenfalls eine Kraftmesseinrichtung an der Treibereinheit 3". Die Pilotzug-Kaltstrang-Einrichtung 7 stellt ebenfalls auf eine gemessene Zugkraft von ON am letzten Rollenpaar ein und zieht das Band 5 über die Hubeinrichtung 6 in die noch nicht angestellte Walzeinheit 4. Dargestellt ist als Walzeinheit 4 nur ein Walzgerüst, es können aber je nach Anforderung auch mehrere sein.The solidifying belt 5 now exits the driver units 3, 3 ', 3 "of the multi-scroll system and is pulled by a pilot train cold-strand device 7. The last pair of rollers also has a force-measuring device on the drive unit 3". The pilot train cold-strand device 7 also adjusts to a measured tensile force of ON on the last pair of rollers and pulls the belt 5 via the lifting device 6 in the not yet employed roller unit 4. Shown is as a rolling unit 4 only a rolling mill, but it can, depending on Request also be several.

Wenn das Band 5 in den noch offenen Walzspalt eingelaufen ist, wird der Looperbogen aufgebaut (Looper hebt an) und der Walzspalt wird zugefahren. Jetzt üben die Looperhöhe und die Walzengeschwindigkeit eine Krafteinwirkung auf das letzte Rollenpaar der Treibereinheit 3" des Multirollenglättsystems aus. Die Wirkung der Hubeinrichtung 6 und der Walzeinheit 4 auf die Kraftmessung an der Treibereinheit 3" des letzten Rollenpaares des Multirollenglättsystems wird über eine weitere Regeleinrichtung so eingestellt, dass sich auch hier eine Zugkraft von ON einstellt.When the belt 5 has entered the still open nip, the looper bow is set up (Looper lifts) and the nip is closed. The action of the lifting device 6 and the rolling unit 4 on the force measurement on the drive unit 3 "of the last pair of rollers of the multi-roll smoothing system is adjusted by means of a further control device that also here a traction of ON occurs.

Wenn die Walzeinheit 4 das Band 5 mit genügender Traktion gegriffen hat, wird die Pilotzug-Kaltstrang-Einrichtung 7 vom Strang ausgeklinkt.When the roller unit 4 has gripped the belt 5 with sufficient traction, the pilot train-cold-strand device 7 is disengaged from the train.

Als Looper für die Hubeinrichtung 6 werden entgegen der konventionellen Looper vorteilhaft pneumatische Zylinder mit sehr geringem Vordruck eingesetzt. Mit diesem System wird eine sehr weiche, selbst federnde Einheit aufgebaut. Die weiche selbst federnde Eigenschaft der Looper unterstützt die für die Herstellung von hochmanganhaltigen Leichtbaustählen geforderte Minimalzugkraft auf den Strang bzw. das erstarrende Band.As a looper for the lifting device 6 pneumatic cylinders are used with very low form contrary to the conventional Looper advantageous. With this system, a very soft, self-resilient unit is built. The soft, self-resilient properties of the Looper support the minimum tensile force required for the production of high-manganese lightweight steels on the strand or solidifying band.

Die Walzen der Walzeinheit 4 werden in einer vorteilhaften Weiterbildung über aktive hydraulische Stoßdämpfer auf den Strang aufgesetzt, damit die Einflüsse beim Eintauchen der Rollen in das Band 5 (Umformgrad) gemindert bzw. unterdrückt werden.The rollers of the roller unit 4 are placed in an advantageous development on active hydraulic shock absorbers on the strand, so that the influences when immersing the rollers in the band 5 (degree of deformation) are reduced or suppressed.

Der entstehende Loopbogen verschafft der Walzgeschwindigkeitsregelung genügend Zeit, um eventuell entstehende Unsynchronitäten auszuregeln.The resulting loop loop gives the rolling speed control sufficient time to correct any unsynchronities.

Die Pilotzugeinrichtung 7 zieht das gegossene Band 5 schon mit der geforderten Kraft in das erste Walzgerüst der Walzeinheit 4, damit auch hier keine Kraftsprünge entstehen.The pilot pulling device 7 already pulls the cast strip 5 with the required force into the first rolling stand of the rolling unit 4, so that no force jumps occur here as well.

Die Aufsetzgeschwindigkeit der Walzen wird mittels Einlauftachos vor dem Aufsetzen auf die Geschwindigkeit des einlaufenden Bandes 5 synchronisiert. Auch hierdurch wird eine Beeinflussung auf das Band 5 verhindert.The contact speed of the rollers is synchronized by means of inlet tachometers prior to placement on the speed of the incoming belt 5. This also prevents interference with the belt 5 is prevented.

Die Looperregelung kann entweder kraftgesteuert, höhengesteuert oder als physikalisches Loopermodell ausgelegt sein.The looper control can either be force-controlled, height-controlled or designed as a physical looper model.

Als Antriebe können z. B. Asynchronmotoren aber auch Gleichstrommotoren verwendet werden. Bei der Verwendung von Asynchronmotoren werden diese über Frequenzumrichter gespeist, wobei jeder Frequenzumrichter einen internen PID-Regler enthält.As drives can z. B. asynchronous motors but also DC motors can be used. When using asynchronous motors, these are supplied by frequency converters, with each frequency converter containing an internal PID controller.

Die geforderte Zugkraft kann als Sollwert für die Pilotzug-Kaltstrang-Einrichtung 7 und die Zugkraft für die Walzeinheit 4 getrennt vorgegeben werden.The required tensile force can be specified separately as a setpoint for the pilot train cold-strand device 7 and the tensile force for the rolling unit 4.

Das Multirollenglättsystem mit den Treibereinheiten 3, 3', 3" ist erfindungsgemäß mit Überlagerungsgetrieben (Ü) starr mit dem Antrieb des Gießbandes 1 verbunden. Hierdurch werden auch sehr kurzfristige Schwankungen der Geschwindigkeit des gegossenen Bandes 5 auf das Multirollenglättsystem übertragen und es entstehen somit auch keine kurzfristigen Differenzgeschwindigkeiten zwischen Band 5 und Multirollenglättsystem mit den Treibereinheiten 3, 3',3".According to the invention, the multi-scroll smoothness system with the driver units 3, 3 ', 3 "is connected rigidly to the drive of the casting belt 1 by means of superposition transmissions (Ü), whereby very short-term fluctuations in the speed of the cast belt 5 are transferred to the multiroll smoothness system and thus none are produced short-term differential speeds between Band 5 and Multirollenglättsystem with the driver units 3, 3 ', 3 ".

In Figur 2 ist ein alternatives Regelkonzept dargestellt. Gleiche Bezugszeichen entsprechen gleichen Bauteilen.In FIG. 2 an alternative control concept is shown. Like reference numerals correspond to like components.

In diesem Fall wird der Bandzug über eine weitere Kraftmessdose, die an dem Gestell der Gießeinheit (Castergestell) angebracht ist, gemessen. Die Kraftmessung zeigt die Reaktionskräfte der auf das Band aufgebrachten Zug- bzw. Schubkräfte direkt an. Dieser Messwert wird einem Regler zugeführt, welcher die Drehzahl eines Überlagerungsmotors (M) direkt regelt.In this case, the strip tension is measured via another load cell, which is attached to the frame of the casting unit (Castergestell). The force measurement directly indicates the reaction forces of the tensile or shear forces applied to the belt. This measured value is fed to a controller which directly controls the speed of an overlay motor (M).

Bei dieser Reglungsart ist es von Vorteil, die gemessenen Kräfte am Rahmengestell 8 der Treibereinheit und am Gestell der Gießeinheit (Caster) zu bilanzieren und die Differenz der beiden Messwerte auf ON zu regeln.In this type of control, it is advantageous to balance the measured forces on the frame frame 8 of the driver unit and on the frame of the casting unit (caster) and to regulate the difference of the two measured values to ON.

In Figur 3 ist eine weitere Alternative gezeigt. Hier wird die Reaktionskraft des Castergestells über Kraftmesszellen einzeln oder als Summenkraft gemessen. Das Castergestell steht entweder auf diesen speziellen Kraftmesssystemen oder ist hängend an diesen befestigt. Auch hier wird direkt die Reaktionskraft des Castergestells auf 0N mit Hilfe des Überlagerungsantriebes ausgeregelt.In FIG. 3 Another alternative is shown. Here, the reaction force of the Castergestells is measured by force cells individually or as a total force. The caster frame is either on these special force measuring systems or hanging attached to these. Again, the reaction force of the Castergestells is corrected directly to 0N using the superposition drive.

In Figur 4 ist ein weiteres mögliches alternatives Regelkonzept dargestellt. Hier wird die Rolle von Tacho T0 als Minilooper eingesetzt. Die Rolle wird wenige Millimeter über die vorgegebene Passline angehoben. Die Biegung des gegossenen Bandes 5 muss hierbei gering gehalten werden, um eine etwaige Rissbildung zu vermeiden. Wenn das Förderband 1 das gegossene Band 5 durch die Treibereinheiten 3, 3', 3" schiebt, wird sich der entstandene "Looperbogen" tendenziell vergrößern. Wenn die Treibereinheiten 3, 3', 3" am Band 5 "ziehen", wird sich der "Looperbogen" verringern. Auch dieses Signal wird erfindungsgemäß zur Regelung des Überlagerungsgetriebes (Ü) benutzt.In FIG. 4 another possible alternative control concept is shown. Here the role of Tacho T0 is used as Minilooper. The roller is raised a few millimeters above the specified passline. The bending of the cast strip 5 here must be kept low in order to avoid any cracking. When the conveyor belt 1 pushes the cast strip 5 through the driver units 3, 3 ', 3 ", the resulting loop bow will tend to increase in size Reduce Looperbogen. Also this signal is used according to the invention for controlling the superposition gearing (Ü).

Zusammenfassend dienen die in den Figuren 1 bis 4 dargestellten Regelkonzepte dazu, zwischen Gießeinheit und der davon erfindungsgemäß entkoppelten Treibereinheit 3, 3', 3", sowie zwischen Treibereinheit 3, 3', 3" und Walzeinheit 4 einen minimalen Zug (0N) einstellen zu können. Bezugszeichenliste Nr. Bezeichnung 1 Förderband 2 Umlenkrollen 3, 3', 3" Treibereinheiten 4 Walzeinheit 5 gegossenes Band 6 Hubeinrichtung (Looper) 7 Pilotzug-Kaltstrang-Einrichtung 8 Rahmengestell Ü Überlagerungsgetriebe T Tacho M Motor R Regler Z Pneumatikzylinder ZH Hydraulikzylinder F Kraftmessung S Walzspalt Lh Looperhöhe FI Looperkraft In summary, serve in the FIGS. 1 to 4 illustrated control concepts to be able to set a minimum train (0N) between the casting unit and the decoupled according to the invention driver unit 3, 3 ', 3 ", and between the driver unit 3, 3', 3" and roller unit. LIST OF REFERENCE NUMBERS No. description 1 conveyor belt 2 guide rollers 3, 3 ', 3 " driver units 4 rolling unit 5 cast tape 6 Lifting device (Looper) 7 Pilot train-dummy bar facility 8th frame Ü Superposition gear T speedometer M engine R regulator Z pneumatic cylinder ZH hydraulic cylinders F force measurement S nip lh Looperhöhe FI Looperkraft

Claims (10)

  1. Continuously operating strip casting and rolling plant with a strip tension regulation consisting of a casting unit with a feed vessel, which contains the melt, with a horizontally disposed runner and an outlet region formed as a casting nozzle and a primary cooling zone, which has two deflecting rollers (2) and an encircling cooled casting belt (1), and at least one downstream rolling unit (4) consisting of at least two drivable rollers,
    wherein for minimisation of the tension on the cast strip (5) the casting unit and the downstream rolling unit (4) are mechanically decoupled, and
    wherein for the decoupling at least one driver unit (3, 3', 3"), which comprises at least two drivable rollers, for driving the strip (5) is arranged between casting belt (1) and rolling unit (4),
    characterised in that the driver unit (3, 3', 3") is eccentrically mounted for rotation, wherein the rollers of the driver unit (3, 3', 3") are displaceable substantially parallel to the longitudinal axis of the strip (5) in casting direction or opposite to the casting direction during the casting and rolling process.
  2. Device according to claim 1, characterised in that the driver units (3, 3', 3") are arranged in a frame structure (8) and the individual drive units (3, 3', 3") are supported relative to the frame structure (8) by way of force measuring devices.
  3. Device according to one of claims 1 and 2, characterised in that the drives of the casting belt (1) and the driver unit (3, 3', 3") are mechanically coupled.
  4. Device according to claim 3, characterised in that the coupling is effected by a superposition transmission (Ü).
  5. Device according to any one of claims 1 to 4, characterised in that for the decoupling of driver unit (3, 3', 3") and roller unit (4) a stroke device (6) for the strip (5) is interposed.
  6. Device according to claim 5, characterised in that the stroke device (6) is designed as a self-cushioning unit.
  7. Device according to claim 6, characterised in that the cushioning unit is, for example, a pneumatic cylinder.
  8. Device according to any one of claims 1 to 7, characterised in that the rolls of the rolling unit (4) are provided with a shock absorber cushioning touchdown on the strip (5).
  9. Device according to claim 8, characterised in that the shock absorbers are settable hydraulic shock absorbers which can be switched off.
  10. Device according to any one of claims 1 to 9, characterised in that the drives are direct current motors.
EP13765617.9A 2012-07-03 2013-07-03 Continuously operating casting and rolling system Active EP2869945B1 (en)

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PL13765617T PL2869945T3 (en) 2012-07-03 2013-07-03 Continuously operating casting and rolling system

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DE102012013425.8A DE102012013425A1 (en) 2012-07-03 2012-07-03 Continuous strip casting and rolling plant
PCT/DE2013/000383 WO2014005575A2 (en) 2012-07-03 2013-07-03 Continuously operating casting and rolling system

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CN (1) CN104395005B (en)
DE (1) DE102012013425A1 (en)
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CN109158562A (en) * 2018-09-30 2019-01-08 烟台金晖铜业有限公司 A kind of dedicated contact line of rigid contact net and preparation method thereof
BR112021006560A2 (en) * 2018-10-31 2021-07-13 Nippon Steel Corporation control system, control method, control device and program

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RU2603419C2 (en) 2016-11-27
ES2613096T3 (en) 2017-05-22
RU2015103226A (en) 2016-08-20
CN104395005A (en) 2015-03-04
WO2014005575A8 (en) 2014-09-12
WO2014005575A3 (en) 2014-03-06
US20150144288A1 (en) 2015-05-28
CN104395005B (en) 2016-08-24
BR112014032671A2 (en) 2017-08-01
EP2869945A2 (en) 2015-05-13
US9630243B2 (en) 2017-04-25
PL2869945T3 (en) 2017-04-28
WO2014005575A2 (en) 2014-01-09
DE102012013425A1 (en) 2014-01-09

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