EP1068035B1 - Method for the continuous casting of a thin strip and device for carrying out said method - Google Patents

Method for the continuous casting of a thin strip and device for carrying out said method Download PDF

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Publication number
EP1068035B1
EP1068035B1 EP99915539A EP99915539A EP1068035B1 EP 1068035 B1 EP1068035 B1 EP 1068035B1 EP 99915539 A EP99915539 A EP 99915539A EP 99915539 A EP99915539 A EP 99915539A EP 1068035 B1 EP1068035 B1 EP 1068035B1
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EP
European Patent Office
Prior art keywords
gas
casting rolls
casting
process according
strip
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
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EP99915539A
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German (de)
French (fr)
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EP1068035A1 (en
Inventor
Gerald Hohenbichler
Gerald Eckerstorfer
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Primetals Technologies Austria GmbH
Acciai Speciali Terni SpA
Original Assignee
Voest Alpine Industrienlagenbau GmbH
Acciai Speciali Terni SpA
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Publication of EP1068035A1 publication Critical patent/EP1068035A1/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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
    • 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
    • B22D11/0637—Accessories therefor
    • B22D11/0648—Casting surfaces
    • B22D11/0651—Casting wheels
    • 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
    • B22D11/0637—Accessories therefor
    • B22D11/0665—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating
    • 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
    • B22D11/0637—Accessories therefor
    • B22D11/0697—Accessories therefor for casting in a protected atmosphere

Definitions

  • the invention relates to a method for the continuous casting of a thin strip, in particular a steel strip, preferably with a thickness less than 10 mm, in Two-roll process, where molten metal is in one of two casting rolls in thickness poured the casting gap to be cast to form a weld pool and the surfaces of the casting rolls above the weld pool with an inert gas or inert gas mixture depending on the condition of the surfaces of the casting rolls be rinsed, and a device for performing the method.
  • the cross section of the strip becomes determined by the profile of the casting rolls when hot. It is essential that that Hot profile corresponds exactly to the desired strip cross section, since the strip profile in the Connection to the casting process can no longer be changed, etc. not through either a rolling process.
  • the hot profile of the casting rolls differs significantly from the cold profile, e.g. due to the periodically occurring very high thermal loads on the surfaces of the Casting rolls. This results in a thermal crowning, which at least one can partially compensate for it by concave pre-grinding of the casting rolls.
  • the thermal load on the casting rolls during the casting process is varied is influenced by parameters and also a belt caster a large one Operating range (e.g. a casting speed range between 0.2 and 2.5 m / sec, a band thickness range between 1 to 10 mm, different at the Casting rolls occurring rolling forces, different temperatures of the to be cast Metal melt, different melt qualities, e.g. different types of steel etc.), adequate pre-profiling of the casting rolls by pre-grinding is not possible. Rather, an online adjustment of the casting roll surfaces is necessary to adapt different operating points required.
  • a large one Operating range e.g. a casting speed range between 0.2 and 2.5 m / sec, a band thickness range between 1 to 10 mm, different at the Casting rolls occurring rolling forces, different temperatures of the to be cast Metal melt, different melt qualities, e.g. different types of steel etc.
  • Such an online adjustment is from, for example AU-A-50 340/96 known.
  • the surfaces of the casting rolls with sensors observed that are coupled with a computer.
  • the computer controls a gas supply to the casting rolls, with two different gases, namely nitrogen and argon, for Influencing the heat transfer just above the bath level of the weld pool the casting rolls and thus the melt pool, etc. depending on the Condition of the surfaces of the casting rolls in different subsets. That so
  • the mixed gas formed is distributed over the entire longitudinal extent of the casting rolls Surfaces fed. This is to avoid thermal crowning of the casting rolls and ensure a uniform thickness of the tape produced.
  • the invention aims to avoid these disadvantages and difficulties and provides the task, a method and a device for performing the method to create the type described above, which also for very different Operating conditions enable the production of a tape with an ideal cross section.
  • the occurrence of thermal deformations of the casting rolls is said to result local smoothing points are avoided.
  • This object is achieved in that the gas purging Surfaces of the casting rolls locally over the longitudinal extent of the casting rolls is carried out differently that the surfaces of the casting rolls over their Longitudinal extension can be observed with regard to locally different states and that the gas purging of the surfaces of the casting rolls depending on the observation is carried out.
  • the locally different gas purging is preferably carried out with locally different ones Gas compositions performed.
  • a simple implementation of the method is given when the surfaces of the Casting rolls in the direction of their longitudinal extent in zones arranged one behind the other be classified and each zone observed with regard to the state of the surfaces is and the locally different gas purging zone by zone, d. i.e., with within everyone Zone of uniform and uniform gas purging is carried out, preferably at least three adjacent zones or up to 40 adjacent zones Zones are formed.
  • a preferred embodiment is characterized in that the observation of the Surfaces of the casting rolls by receiving from the surfaces and / or reflected electromagnetic waves, especially in the visible range Light and / or in the range of heat radiation is carried out.
  • the observation of the Surfaces of the casting rolls indirectly by observing the cast strip the width of the strip after it emerges from the casting gap, expediently at least a surface of the tape immediately after the tape exits the casting gap its width is observed, and being preferably from the surface of the tape outgoing and / or reflected electromagnetic waves, especially in the area of visible light and / or in the area of heat radiation.
  • the gas purging is preferably carried out with a pressure at the gas outlet openings of at least 1.05 to a maximum of 2 bar, preferably at least 1.5 bar, wherein expediently the gas purging with an exit velocity of the gas to the Gas outlet openings of at least 0.2 m / sec, preferably of at least 1.5 m / sec.
  • Each gas supply device preferably has a plurality of closely adjacent ones Gas outlets on.
  • a preferred embodiment is characterized in that the Gas supply devices to two or more different gas Containing gas storage via gas lines equipped with throttling or shut-off devices are connected, the gas lines of each gas supply device in one of the Mixing device associated with gas supply device, preferably a mixing chamber, open, from each of which at least one gas supply line to the or Guide gas outlet orifice (s) that are assigned to the gas supply device.
  • the devices for observing the surfaces of the casting rolls of are expedient sensors directed against the surfaces of the casting rolls.
  • a sensor for each of the casting rolls a profile sensor for the integral observation of the surfaces of the Casting rolls over their longitudinal extent, preferably over their entire length Longitudinal extension, provided.
  • the axes of the gas outlet openings are preferably in a range between + 60 ° and -60 °, preferably between + 20 ° and -30 °, in the circumferential direction against the surfaces of the casting rolls.
  • a preferred embodiment is characterized in that the surfaces of the Casting rolls have a roughness of more than 4 microns, preferably more than 8 microns.
  • the surfaces of the casting rolls are provided with dimples, their depth between 10 and 100 microns and their diameter is between 0.2 and 1.0 mm, advantageously dimples touching each other, preferably 5 to 20% of the dimples.
  • a good gas purging is ensured if more than 20% of the dimples touch each other.
  • FIG. 1 shows a side view of a Device according to the invention for continuous casting of a thin strip according to a first Embodiment.
  • Fig. 2 illustrates a detail of this Fig. 1 and
  • Fig. 3 is a plan view in the direction of arrow III in FIG. 1.
  • FIG. 4 shows the gas purging in diagram form individual peripheral zones.
  • a thin strip 1 for casting a thin strip 1, in particular a steel strip with a thickness between 1 and 10 mm, one of two serves parallel to and next to each other arranged casting rolls 2 continuous casting mold.
  • the casting rolls 2 form one Pouring gap 3, the so-called "kissing point", at which the strip 1 from the continuous casting mold exit.
  • Above the casting gap 3 is a space 4 which forms a cover Cover plate 5 is shielded upwards, formed and for receiving a Melting bath 6 is used.
  • the molten metal 7 is through an opening 8 of the cover, through which a dip tube protrudes into the molten bath 6 to below the bath level 9.
  • the Casting rolls 2 are provided with internal cooling, not shown. Laterally the Casting rolls 2 are side plates 10 for sealing the weld pool 6 Room 4 provided.
  • a strand shell 12 is formed on the surfaces 11 of the casting rolls 2, these strand shells in the casting gap 3, i.e. at the kissing point, combined into a volume 1 become.
  • a tape 1 with an approximately uniform thickness - preferably with a slight curvature conforming to standards - it is essential that in the casting gap 3 there is a specific rolling force distribution in a rectangular shape.
  • the cover plate 5 is arranged such that between the cover plate and the Surfaces 11 of the casting rolls 2, a gap 13 of small width is present, which with a optionally resilient sealing lip 14, a labyrinth seal, etc. against the Surfaces 11 of the two casting rolls 2 on the outside to avoid air entry is sealed.
  • the edge of the cover plate 5 directed against the casting rolls 2 is in each case on the surfaces 11 of the casting rolls 2 adapted so that here a gap 13 with approximately constant Width is formed. Inert gas is fed in via this gap 13, etc. about Gas supply lines 15 connected to the cover plate 5 by means of quick couplings 16 are attached, advantageously a quick coupling 16 simultaneously for two or more Gas supply lines 15 is provided.
  • a device 19 for observing the same.
  • a profile sensor 19 directed against a surface 11 of a casting roll 2, respectively the temperature profile integrally measured over the longitudinal extent of each casting roll 2 becomes.
  • the profile sensor 19 is coupled to a computing and control unit 20, etc. so that arranged side by side and distributed over the longitudinal extent of the casting rolls 2 Partial surface areas a, b, c, Vietnamese, i.e. individual adjacent circumferential zones a, b, c, Vietnamese, temperature values or average temperature values can be assigned.
  • a radiation sensor for determining Smoothing points can be provided on the surfaces 11 of the casting rolls 2.
  • each casting roll 2 for To be able to influence one another independently of one another using inert gas is according to the illustrated embodiment shows a plurality of gas supply devices 21 provided, each with a gas supply device 21 of a peripheral zone a, b, c, . « a casting roll 2 is assigned.
  • Compressed gas stores 22 for different gases are provided for gas purging; according to the illustrated embodiment e.g. three compressed gas stores 22, each the compressed gas storage 22 is filled with a certain gas, e.g. one with nitrogen, one with argon and one with helium. Lead from each of these compressed gas stores 22 Gas lines 24 to a mixing chamber assigned to each of the peripheral zones a, b, c, Vietnamese 23, wherein in the gas lines 24 built-in throttling and shut-off devices 25 in each of the mixing chambers 23 has a specific gas composition formed from or several of the gases contained in the compressed gas stores 22 can be set.
  • a certain gas e.g. one with nitrogen, one with argon and one with helium.
  • This Throttle and shut-off devices 25 are coupled to the controller 20 and are by this controlled so that for each mixing chamber 23 and thus for each of the peripheral zones a, b, c, Vietnamese a special gas composition, corresponding to that over the longitudinal extent of each Casting roller 2 existing temperature profile, can be adjusted.
  • the control setpoints determines the controller 20 based on that detected by the respective sensor 19 Temperature profiles.
  • a gas supply line 15 leads to one at the edge of the Cover plate 5 provided gas outlet mouth 18, whereby the surfaces 11 of the Casting rolls 2 each with different circumferential zones Gas compositions, ie with - seen in the longitudinal direction of the casting rolls 2 - locally different gas mixtures can be acted upon.
  • a gas supply device for supplying gas to a peripheral zone a, b, c, Vietnamese of gas lines 24 (number corresponding to the number of compressed gas stores 22) Throttling and shut-off devices 25, a mixing chamber 23, a gas supply line 15 and at least one gas outlet mouth 18 is formed.
  • the inflow of the gas should be at least 1.05 bar, preferably more than 1.5 bar up to 2 bar, take place, the axes of the Gas outlet openings 18 are substantially normal to the casting roll surface can, but are inclined in or against the direction of movement of the roller surface, u.zw. in the range of ⁇ 60 °.
  • the choice of the widths of the peripheral zones a, b, c, Vietnamese depends after the possible susceptibility of the casting process to malfunction, which in turn is largely determined by the process parameters.
  • surfaces 11 of FIG Casting rolls 2 observed directly, but it is by direct observation of one of the Surfaces 26 or both surfaces 26 of the tape 1 on the condition of the surfaces 11 of the casting rolls 2 closed. Therefore, in this embodiment, the sensors 19 directed against the surfaces 26 of the belt 1, etc. as soon as possible after leaving the tape 1 from the casting gap 3, as shown in Fig. 1 with dash-dotted lines is illustrated.
  • the invention is not limited to that shown in the drawing Embodiments, but can be modified in various ways.
  • the surfaces 11 of the casting rolls 2 can also be influenced in that instead of the local change in the gas composition, also locally different gas quantities and / or locally different gas pressures can be set.
  • Fig. 4 shows diagrammatically the different loading of Circumferential zones a, b, c, Vietnamese with different gas compositions A, B, C, Vietnamese again.
  • the individual ones lying next to each other are on the abscissa of the diagram Circumferential zones a, b, c, Vietnamese plotted. Their sum corresponds to the length of one Casting roller 11.
  • the individual circumferential zones a, b, c, Across the individual circumferential zones a, b, c, Across assigned temperature values and it results in a very fine measurement a temperature profile according to line 27.
  • the invention is based on the idea that a local local influence on a partial surface the total surface 11 of a casting roll 2 by locally differently supplied Gas mixtures or gas quantities are possible, etc. by supplying these gas mixtures just above the melt pool level 9.
  • different gas mixtures which lead to different solidification rates, also in areas close to each other, i.e. also in immediately adjacent Can be introduced areas of the molten pool level 9 and still a different influence of adjacent surface zones or Circumferential zones a, b, c, Vietnamese of the casting rolls 2 is possible, whereby a Uneven surfaces 11 of the casting rolls 2 can be stopped.
  • the solidification structure in particular the central one globulitic-dentric solidification structure
  • the band 1 produced more evenly over the entire width and secondly the reconditioning (equalizing the surfaces 11 of the casting rolls 2) always required after a larger number of castings. Consequently not only the service life of the surface layer, but especially the Service life of the entire casting rolls 2 increased significantly.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Metal Rolling (AREA)
  • Ropes Or Cables (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Moulding By Coating Moulds (AREA)

Abstract

A process for continuously casting a thin metal strip controls has jets directed at casting rollers using sensor feedback. Sensor feedback can be taken directly from the rollers, or can be determined indirectly by sensing a condition of the thin metal strip. Surface conditions are controlled over a longitudinal extent of the rollers through locally controlled gas jets. The feedback control of the roller surfaces provides a more uniform casting surface and a more consistent output from the casting surface.

Description

Die Erfindung betrifft ein Verfahren zum Stranggießen eines dünnen Bandes, insbesondere eines Stahlbandes, vorzugsweise mit einer Dicke geringer als 10 mm, im Zweiwalzenverfahren, wobei Metallschmelze in einen von zwei Gießwalzen in der Dicke des zu gießenden Bandes gebildeten Gießspalt unter Bildung eines Schmelzbades gegossen wird und die Oberflächen der Gießwalzen oberhalb des Schmelzbades mit einem Inertgas oder Inertgasgemisch in Abhängigkeit des Zustandes der Oberflächen der Gießwalzen bespült werden, sowie eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a method for the continuous casting of a thin strip, in particular a steel strip, preferably with a thickness less than 10 mm, in Two-roll process, where molten metal is in one of two casting rolls in thickness poured the casting gap to be cast to form a weld pool and the surfaces of the casting rolls above the weld pool with an inert gas or inert gas mixture depending on the condition of the surfaces of the casting rolls be rinsed, and a device for performing the method.

Beim Gießen eines dünnen Bandes im Zweiwalzverfahren wird der Querschnitt des Bandes durch das Profil der Gießwalzen im heißen Zustand bestimmt. Es ist wesentlich, daß das Heißprofil genau dem gewünschten Bandquerschnitt entspricht, da das Bandprofil im Anschluß an den Gießprozeß nicht mehr verändert werden kann, u.zw. auch nicht durch einen Walzprozeß. Das Heißprofil der Gießwalzen weicht vom Kaltprofil erheblich ab, u.zw. infolge der periodisch auftretenden sehr hohen thermischen Belastungen der Oberflächen der Gießwalzen. Es ergibt sich hierbei eine thermische Balligkeit, die man jedoch zumindest partiell durch einen konkaven Vorschliff der Gießwalzen kompensieren kann.When casting a thin strip using the two-roll process, the cross section of the strip becomes determined by the profile of the casting rolls when hot. It is essential that that Hot profile corresponds exactly to the desired strip cross section, since the strip profile in the Connection to the casting process can no longer be changed, etc. not through either a rolling process. The hot profile of the casting rolls differs significantly from the cold profile, e.g. due to the periodically occurring very high thermal loads on the surfaces of the Casting rolls. This results in a thermal crowning, which at least one can partially compensate for it by concave pre-grinding of the casting rolls.

Da die thermische Belastung der Gießwalzen beim Gießprozeß jedoch von einer Vielzahl von Parametern beeinflußt wird und zudem eine Bandgießanlage einen großen Betriebsbereich umfassen sollte (z.B. einen Gießgeschwindigkeitsbereich zwischen 0,2 und 2,5 m/sec, einen Banddickenbereich zwischen 1 bis 10 mm, unterschiedliche an den Gießwalzen auftretende Walzkräfte, unterschiedliche Temperaturen der zu gießenden Metallschmelze, unterschiedliche Schmelzenqualitäten, wie z.B. unterschiedliche Stahlsorten etc.), ist eine hinreichende Vorprofilierung der Gießwalzen durch einen Vorschliff nicht möglich. Vielmehr ist eine Online-Justierung der Gießwalzenoberflächen zur Anpassung an verschiedene Betriebspunkte erforderlich.However, since the thermal load on the casting rolls during the casting process is varied is influenced by parameters and also a belt caster a large one Operating range (e.g. a casting speed range between 0.2 and 2.5 m / sec, a band thickness range between 1 to 10 mm, different at the Casting rolls occurring rolling forces, different temperatures of the to be cast Metal melt, different melt qualities, e.g. different types of steel etc.), adequate pre-profiling of the casting rolls by pre-grinding is not possible. Rather, an online adjustment of the casting roll surfaces is necessary to adapt different operating points required.

Eine solche Online-Justierung, wie sie einleitend beschrieben ist, ist beispielsweise aus der AU-A - 50 340/96 bekannt. Hierbei werden die Oberflächen der Gießwalzen mit Sensoren beobachtet, die mit einem Rechner gekoppelt sind. Der Rechner steuert eine Gaszuführung zu den Gießwalzen, wobei zwei unterschiedliche Gase, nämlich Stickstoff und Argon, zur Beeinflussung des Wärmeüberganges knapp oberhalb des Badspiegels des Schmelzbades den Gießwalzen und damit dem Schmelzbad zugeführt werden, u.zw. in Abhängigkeit des Zustandes der Oberflächen der Gießwalzen in unterschiedlichen Teilmengen. Das so gebildete Mischgas wird über die gesamte Längserstreckung der Gießwalzen verteilt deren Oberflächen zugeführt. Hierdurch soll eine thermische Balligkeit der Gießwalzen vermieden und eine gleichmäßige Dicke des erzeugten Bandes sichergestellt werden. Als Alternative wird auch vorgeschlagen, die Banddicke über die Breite des Bandes verteilt zu messen, so daß Abweichungen von einem Rechteckquerschnitt des Bandes erfaßt werden können und durch entsprechende Mischungsverhältnisse der den Gießwalzenoberflächen zugeführten Gase kompensiert werden können. Durch die unterschiedlichen Gaszusammensetzungen kann, wie erwähnt, der Wärmeübergang zwischen den Gießwalzen und der Metallschmelze maßgeblich beeinflußt werden, wodurch Änderungen der Geometrie der Gießwalzen bewirkt werden.Such an online adjustment, as described in the introduction, is from, for example AU-A-50 340/96 known. Here, the surfaces of the casting rolls with sensors observed that are coupled with a computer. The computer controls a gas supply to the casting rolls, with two different gases, namely nitrogen and argon, for Influencing the heat transfer just above the bath level of the weld pool the casting rolls and thus the melt pool, etc. depending on the Condition of the surfaces of the casting rolls in different subsets. That so The mixed gas formed is distributed over the entire longitudinal extent of the casting rolls Surfaces fed. This is to avoid thermal crowning of the casting rolls and ensure a uniform thickness of the tape produced. As alternative it is also proposed to measure the strip thickness over the width of the strip, so that deviations from a rectangular cross section of the tape can be detected and by appropriate mixing ratios of those fed to the casting roll surfaces Gases can be compensated. Due to the different gas compositions can, as mentioned, the heat transfer between the casting rolls and the molten metal are significantly influenced, which causes changes in the geometry of the casting rolls become.

Interne Forschungen auf dem Gebiet des Zweiwalzengießens haben ergeben, daß trotz der oben beschriebenen Maßnahmen ein zufriedenstellendes Produkt nicht erhalten werden kann. Es wurde das Phänomen beobachtet, daß eine möglichst gleichförmig über die gesamte Oberfläche der Gießwalzen vorhandene Rauhigkeit zufolge thermischer Deformation der Gießwalzen und zufolge leicht ungleichmäßiger Erstarrung der Metallschmelze an den Oberflächen der Gießwalzen trotz Zuführung gezielt eingestellter Gasmischungen nicht erhalten bleibt, sondern daß umfangsorientierte Glättungsstellen, die sich nicht über die gesamte Längserstreckung der Gießwalzen erstrecken, auftreten. Es kommt z.B. zu helleren, glatten Stellen am Umfang der Gießwalzen. Da solche glatte Stellen infolge der geringeren Rauhigkeit eine raschere Erstarrung der Metallschmelze und somit einen besseren Kontakt im Gießspalt, dem sogenannten "Kissing-point" bewirken, was wiederum zu höheren lokalen spezifischen Walzkräften führt, verstärkt sich die Glättung der Gießwalzen in diesen schon bereits glatteren Bereichen. Es kommt somit zu einer Aufschaukelung und damit zu einer immer schlechteren Bandqualität, die durch die oben beschriebenen Maßnahmen, nämlich einer Änderung des Mischungsverhältnisses des nahe dem Badspiegel eingespeisten Gases nicht behoben werden kann.Internal research in the field of two-roll casting has shown that despite the measures described above a satisfactory product cannot be obtained can. The phenomenon was observed that one was as uniform as possible over the whole Surface roughness of the casting rolls due to thermal deformation of the Casting rollers and due to slightly uneven solidification of the molten metal on the Surfaces of the casting rolls, despite the supply of specifically adjusted gas mixtures is preserved, but that circumferential smoothing points that are not over the stretch the entire length of the casting rolls, occur. It comes e.g. to lighter, smooth spots on the circumference of the casting rolls. Because such smooth spots due to the lesser Roughness faster solidification of the molten metal and thus better contact in the pouring gap, the so-called "kissing point", which in turn leads to higher local specific rolling forces, the smoothing of the casting rolls in these already increases already smoother areas. So there is a build-up and thus one increasingly poor tape quality by the measures described above, namely a change in the mixing ratio of the gas fed in near the bath level cannot be fixed.

Die Erfindung bezweckt die Vermeidung dieser Nachteile und Schwierigkeiten und stellt sich die Aufgabe, ein Verfahren sowie eine Vorrichtung zur Durchführung des Verfahrens der eingangs beschriebenen Art zu schaffen, welche auch für stark unterschiedliche Betriebszustände die Erzeugung eines Bandes mit einem Idealquerschnitt ermöglichen. Insbesondere soll das Auftreten von thermischen Deformationen der Gießwalzen infolge örtlicher Glättungsstellen vermieden werden. The invention aims to avoid these disadvantages and difficulties and provides the task, a method and a device for performing the method to create the type described above, which also for very different Operating conditions enable the production of a tape with an ideal cross section. In particular, the occurrence of thermal deformations of the casting rolls is said to result local smoothing points are avoided.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Gasbespülung der Oberflächen der Gießwalzen über die Längserstreckung der Gießwalzen örtlich unterschiedlich durchgeführt wird, daß die Oberflächen der Gießwalzen über ihre Längserstreckung hinsichtlich örtlich unterschiedlicher Zustände beobachtet werden und daß die Gasbespülung der Oberflächen der Gießwalzen in Abhängigkeit der Beobachtung durchgeführt wird.This object is achieved in that the gas purging Surfaces of the casting rolls locally over the longitudinal extent of the casting rolls is carried out differently that the surfaces of the casting rolls over their Longitudinal extension can be observed with regard to locally different states and that the gas purging of the surfaces of the casting rolls depending on the observation is carried out.

Vorzugsweise wird die örtlich unterschiedliche Gasbespülung mit örtlich unterschiedlichen Gaszusammensetzungen durchgeführt.The locally different gas purging is preferably carried out with locally different ones Gas compositions performed.

Es ist aber auch möglich, die örtlich unterschiedliche Gasbespülung mit örtlich unterschiedlichen Gasmengen und/oder mit örtlich unterschiedlichen Gasdrücken durchzuführen.But it is also possible to use the locally different gas purging different gas quantities and / or with locally different gas pressures perform.

Vorzugsweise werden örtlich unterschiedliche Zustände der Oberflächenrauhigkeit der Gießwalzen beobachtet.Locally different states of the surface roughness are preferred Casting rolls observed.

Gemäss einer anderen Ausführungsform werden örtlich unterschiedliche Zustände der Oberflächenreflexionseigenschaften der Gießwalzen beobachtet.According to another embodiment, locally different states of the Surface reflection properties of the casting rolls observed.

Es ist jedoch auch möglich, daß örtlich unterschiedliche Verfärbungen der Oberflächen der Gießwalzen beobachtet werden.However, it is also possible that locally different discoloration of the surfaces of the Casting rolls are observed.

Eine einfache Verwirklichung des Verfahrens ist dann gegeben, wenn die Oberflächen der Gießwalzen in Richtung ihrer Längserstreckung in hintereinander angeordnete Zonen eingeteilt werden, und jede Zone hinsichtlich des Zustandes der Oberflächen beobachtet wird und die örtlich unterschiedliche Gasbespülung zonenweise, d. h., mit innerhalb jeder Zone einheitlicher und gleichmässiger Gasbespülung durchgeführt wird, wobei vorzugsweise mindestens drei nebeneinander liegende Zonen bzw. bis zu 40 nebeneinander liegende Zonen gebildet werden.A simple implementation of the method is given when the surfaces of the Casting rolls in the direction of their longitudinal extent in zones arranged one behind the other be classified and each zone observed with regard to the state of the surfaces is and the locally different gas purging zone by zone, d. i.e., with within everyone Zone of uniform and uniform gas purging is carried out, preferably at least three adjacent zones or up to 40 adjacent zones Zones are formed.

Eine bevorzugte Ausführungsform ist dadurch gekennzeichnet, daß die Beobachtung der Oberflächen der Gießwalzen durch Empfangen von von den Oberflächen ausgehenden und/oder reflektierten elektromagnetischen Wellen, insbesondere im Bereich des sichtbaren Lichtes und/oder im Bereich von Wärmestrahlung durchgeführt wird.A preferred embodiment is characterized in that the observation of the Surfaces of the casting rolls by receiving from the surfaces and / or reflected electromagnetic waves, especially in the visible range Light and / or in the range of heat radiation is carried out.

Gemäß einer weiteren Ausführungsform der Erfindung erfolgt die Beobachtung der Oberflächen der Gießwalzen indirekt durch Beobachtung des gegossenen Bandes über dessen Breite nach Austritt des Bandes aus dem Gießspalt, wobei zweckmässig mindestens eine Oberfläche des Bandes unmittelbar nach Austritt des Bandes aus dem Gießspalt über seine Breite beobachtet wird, und wobei vorzugsweise von der Oberfläche des Bandes ausgehende und/oder reflektierte elektromagnetische Wellen, insbesondere im Bereich des sichtbaren Lichtes und/oder im Bereich von Wärmestrahlung, empfangen werden.According to a further embodiment of the invention, the observation of the Surfaces of the casting rolls indirectly by observing the cast strip the width of the strip after it emerges from the casting gap, expediently at least a surface of the tape immediately after the tape exits the casting gap its width is observed, and being preferably from the surface of the tape outgoing and / or reflected electromagnetic waves, especially in the area of visible light and / or in the area of heat radiation.

Vorzugsweise wird die Gasbespülung mit einem Druck an den Gasaustrittsmündungen von mindestens 1,05 bis maximal 2 bar, vorzugsweise mindestens 1,5 bar, durchgeführt, wobei zweckmässig die Gasbespülung mit einer Austrittsgeschwindigkeit des Gases an den Gasaustrittsmündungen von mindestens 0,2 m/sec, vorzugsweise von mindestens 1,5 m/sec, durchgeführt wird.The gas purging is preferably carried out with a pressure at the gas outlet openings of at least 1.05 to a maximum of 2 bar, preferably at least 1.5 bar, wherein expediently the gas purging with an exit velocity of the gas to the Gas outlet openings of at least 0.2 m / sec, preferably of at least 1.5 m / sec.

Eine Vorrichtung zum Stranggießen eines dünnen Bandes unter Anwendung des Verfahrens mit einer von zwei Gießwalzen, die einen Gießspalt begrenzen, gebildeten Stranggießkokille, wobei die Breite des Gießspaltes der Dicke des zu gießenden Bandes entspricht und zwischen den Gießwalzen oberhalb des Gießspaltes eine Schmelzbadaufnahme gebildet ist, die von einer Abdeckung bedeckt ist, mit einer ein inertes Gas zu den Gießwalzen führenden Gaszuführungseinrichtung, die mindestens eine Gasaustrittsmündung knapp oberhalb des zwischen den Gießwalzen vorhandenen Schmelzbades aufweist, mit einer Einrichtung zum Beobachten der Oberflächen der Gießwalzen und mit einer Steuer- oder Regeleinrichtung zum Beeinflussen der Gaszuführung zu den Gießwalzen in Abhängigkeit des Zustandes der Oberflächen der Gießwalzen ist dadurch gekennzeichnet, dass mehrere Gaszuführungseinrichtungen vorgesehen sind, wobei jede Gaszuführungseinrichtung einem Teil-Flächenbereich einer Gießwalze zugeordnet ist, und jeder Teil-Flächenbereich mittels der zugeordneten Gaszuführungseinrichtung entsprechend einem diesem Teil-Flächenbereich von der Steuer- oder Regeleinrichtung diesem Teil-Flächenbereich zugeordneten Beobachtungswert mit Gas beaufschlagbar ist und daß eine Einrichtung zur Beobachtung von Teil-Flächenbereichen der Oberfläche der Gießwalzen vorgesehen ist, die mit der Steuer- oder Regeleinrichtung gekoppelt ist.An apparatus for continuous casting of a thin strip using the method with a continuous casting mold formed by two casting rolls which delimit a casting gap, wherein the width of the casting gap corresponds to the thickness of the strip to be cast and a melt pool intake is formed between the casting rolls above the casting gap, which is covered by a cover with an inert gas leading to the casting rolls Gas supply device, the at least one gas outlet mouth just above the has existing melt pool between the casting rolls, with a device for Observe the surfaces of the casting rolls and with a control or regulating device to influence the gas supply to the casting rolls depending on the state of the Surfaces of the casting rolls is characterized in that several Gas supply devices are provided, each gas supply device one Partial area is assigned to a casting roll, and each partial area by means of the associated gas supply device corresponding to a partial surface area from the control or regulating device of this partial surface area assigned observation value can be acted upon with gas and that a device for Observation of partial surface areas of the surface of the casting rolls is provided is coupled to the control or regulating device.

Vorzugsweise weist jede Gaszuführungseinrichtung mehrere eng benachbarte Gasaustrittsmündungen auf.Each gas supply device preferably has a plurality of closely adjacent ones Gas outlets on.

Eine bevorzugte Ausführungsform ist dadurch gekennzeichnet, daß die Gaszuführungseinrichtungen an zwei oder mehrere jeweils ein unterschiedliches Gas enthaltende Gasspeicher über mit Drossel- oder Absperrorganen ausgerüstete Gasleitungen angeschlossen sind, wobei die Gasleitungen jeder Gaszuführungseinrichtung in eine der Gaszuführungseinrichtung zugeordnete Mischeinrichtung, vorzugsweise eine Mischkammer, münden, von der jeweils mindestens eine Gaszuführungsleitung zu der bzw. den Gasaustrittsmündung(en) führen, die der Gaszuführungseinrichtung zugeordnet ist(sind).A preferred embodiment is characterized in that the Gas supply devices to two or more different gas Containing gas storage via gas lines equipped with throttling or shut-off devices are connected, the gas lines of each gas supply device in one of the Mixing device associated with gas supply device, preferably a mixing chamber, open, from each of which at least one gas supply line to the or Guide gas outlet orifice (s) that are assigned to the gas supply device.

Zweckmäßig sind die Einrichtungen zum Beobachten der Oberflächen der Gießwalzen von gegen die Oberflächen der Gießwalzen gerichteten Sensoren gebildet.The devices for observing the surfaces of the casting rolls of are expedient sensors directed against the surfaces of the casting rolls.

Für eine besonders genaue Beobachtung der Oberflächen der Gießwalzen ist als Sensor für jede der Gießwalzen ein Profilsensor zwecks integraler Beobachtung der Oberflächen der Gießwalzen über deren Längserstreckung, vorzugsweise über deren gesamte Längserstreckung, vorgesehen.For a particularly precise observation of the surfaces of the casting rolls is a sensor for each of the casting rolls a profile sensor for the integral observation of the surfaces of the Casting rolls over their longitudinal extent, preferably over their entire length Longitudinal extension, provided.

Es ist auch möglich, die Oberflächen der Gießwalzen indirekt, u. zw. über das gegossene Band zu beobachten, wobei die Einrichtungen zum Beobachten der Oberflächen der Gießwalzen von gegen mindestens eine der Oberflächen des gegossenen Bandes gerichteten Sensoren gebildet sind.It is also possible to indirectly, u. between the cast Tape watch, the facilities for observing the surfaces of the Casting rolls directed against at least one of the surfaces of the cast strip Sensors are formed.

Nach einer weiteren bevorzugten Ausführungsform sind, verteilt über die Längserstreckung der Gießwalzen, zwei oder mehrere, vorzugsweise mindestens drei, Einrichtungen zum Beobachten der Oberflächen der Gießwalzen vorgesehen, die jeweils für sich über eine Steuer- oder Regeleinrichtung mit jeweils einer Gaszuführungseinrichtung gekoppelt sind.According to a further preferred embodiment, are distributed over the longitudinal extent the casting rolls, two or more, preferably at least three, devices for Observe the surfaces of the casting rolls provided, each one for itself Control or regulating device are each coupled to a gas supply device.

Vorzugsweise sind die Achsen der Gasaustrittsmündungen in einem Bereich zwischen +60° und -60°, vorzugsweise zwischen +20° und -30°, in Umfangsrichtung gegen die Oberflächen der Gießwalzen gerichtet.The axes of the gas outlet openings are preferably in a range between + 60 ° and -60 °, preferably between + 20 ° and -30 °, in the circumferential direction against the surfaces of the casting rolls.

Eine bevorzugte Ausführungsform ist dadurch gekennzeichnet, daß die Oberflächen der Gießwalzen eine Rauhigkeit von mehr als 4 µm, vorzugsweise mehr als 8 µm, aufweisen.A preferred embodiment is characterized in that the surfaces of the Casting rolls have a roughness of more than 4 microns, preferably more than 8 microns.

Gemäß einer weiteren bevorzugten Ausführungsform sind die Oberflächen der Gießwalzen mit Grübchen versehen, deren Tiefe zwischen 10 und 100 µm und deren Durchmesser zwischen 0,2 und 1,0 mm liegt, wobei vorteilhaft Grübchen einander berühren, vorzugsweise 5 bis 20 % der Grübchen.According to a further preferred embodiment, the surfaces of the casting rolls are provided with dimples, their depth between 10 and 100 microns and their diameter is between 0.2 and 1.0 mm, advantageously dimples touching each other, preferably 5 to 20% of the dimples.

Eine gute Gasbespülung ist gesichert, wenn mehr als 20 % der Grübchen einander berühren. A good gas purging is ensured if more than 20% of the dimples touch each other.

Die Erfindung ist nachfolgend anhand zweier in der Zeichnung schematisch dargestellter Ausführungsbeispiele näher erläutert. Fig. 1 zeigt eine Seitenansicht einer erfindungsgemäßen Vorrichtung zum Stranggießen eines dünnen Bandes gemäß einer ersten Ausführungsform. Fig 2 veranschaulicht ein Detail dieser Fig. 1 und Fig. 3 eine Draufsicht in Richtung des Pfeiles III der Fig. 1. Fig. 4 zeigt in Diagrammform die Gasbespülung einzelner Umfangszonen.The invention is described below with reference to two schematically in the drawing Exemplary embodiments explained in more detail. Fig. 1 shows a side view of a Device according to the invention for continuous casting of a thin strip according to a first Embodiment. Fig. 2 illustrates a detail of this Fig. 1 and Fig. 3 is a plan view in the direction of arrow III in FIG. 1. FIG. 4 shows the gas purging in diagram form individual peripheral zones.

Zum Gießen eines dünnen Bandes 1, insbesondere eines Stahlbandes mit einer Dicke zwischen 1 und 10 mm, dient eine von zwei parallel zueinander und nebeneinander angeordneten Gießwalzen 2 gebildete Stranggießkokille. Die Gießwalzen 2 bilden einen Gießspalt 3, den sogenannten "Kissing-point", an dem das Band 1 aus der Stranggießkokille austritt. Oberhalb des Gießspaltes 3 ist ein Raum 4, der von einer eine Abdeckung bildenden Abdeckplatte 5 nach oben abgeschirmt ist, gebildet und der zur Aufnahme eines Schmelzbades 6 dient. Die Metallschmelze 7 wird über eine Öffnung 8 der Abdeckung, durch die ein Tauchrohr in das Schmelzbad 6 bis unter den Badspiegel 9 ragt, zugeführt. Die Gießwalzen 2 sind mit einer nicht dargestellten Innenkühlung versehen. Seitlich der Gießwalzen 2 sind Seitenplatten 10 zur Abdichtung des das Schmelzbad 6 aufnehmenden Raumes 4 vorgesehen.For casting a thin strip 1, in particular a steel strip with a thickness between 1 and 10 mm, one of two serves parallel to and next to each other arranged casting rolls 2 continuous casting mold. The casting rolls 2 form one Pouring gap 3, the so-called "kissing point", at which the strip 1 from the continuous casting mold exit. Above the casting gap 3 is a space 4 which forms a cover Cover plate 5 is shielded upwards, formed and for receiving a Melting bath 6 is used. The molten metal 7 is through an opening 8 of the cover, through which a dip tube protrudes into the molten bath 6 to below the bath level 9. The Casting rolls 2 are provided with internal cooling, not shown. Laterally the Casting rolls 2 are side plates 10 for sealing the weld pool 6 Room 4 provided.

An den Oberflächen 11 der Gießwalzen 2 kommt es zur Bildung einer Strangschale 12, wobei diese Strangschalen im Gießspalt 3, d.h. am Kissing-point, zu einem Band 1 vereinigt werden. Zur optimalen Bildung eines Bandes 1 mit in etwa gleichmäßiger Dicke - vorzugsweise mit leichter normgerechter Wölbung - ist es wesentlich, daß im Gießspalt 3 eine spezifische Walzkraftverteilung in Rechteckform vorliegt.A strand shell 12 is formed on the surfaces 11 of the casting rolls 2, these strand shells in the casting gap 3, i.e. at the kissing point, combined into a volume 1 become. For optimal formation of a tape 1 with an approximately uniform thickness - preferably with a slight curvature conforming to standards - it is essential that in the casting gap 3 there is a specific rolling force distribution in a rectangular shape.

Die Abdeckplatte 5 ist derart angeordnet, daß zwischen der Abdeckplatte und den Oberflächen 11 der Gießwalzen 2 ein Spalt 13 geringer Breite vorhanden ist, der mit einer gegebenenfalls federnden Dichtlippe 14, einer Labyrinthdichtung etc., gegen die Oberflächen 11 der beiden Gießwalzen 2 außenseitig zur Vermeidung eines Lufteintritts gedichtet ist. Der gegen die Gießwalzen 2 gerichtete Rand der Abdeckplatte 5 ist jeweils an die Oberflächen 11 der Gießwalzen 2 angepaßt, so daß hier ein Spalt 13 mit etwa konstanter Breite gebildet ist. Über diesen Spalt 13 wird Inertgas zugeleitet, u.zw. über Gaszuführungsleitungen 15, die an der Abdeckplatte 5 mittels Schnellkupplungen 16 befestigt sind, wobei vorteilhaft eine Schnellkupplung 16 gleichzeitig für zwei oder mehrere Gaszuführungsleitungen 15 vorgesehen ist. Wichtig ist ein dichter und präziser Anschluß, der auch stumpf sein kann, da die Gasdrücke in den einzelnen Gaszuführungsleitungen 15 untereinander nicht gleich sein müssen. In Fortsetzung der Gaszuführungsleitungen 15 sind in der Abdeckplatte Bohrungen 17 (es könnten auch Schlitze sein) vorgesehen, die in den Spalt 13 zwischen der Abdeckplatte und der jeweiligen Gießwalze 2 über eine Gasaustrittsmündung 18 münden. Diese Bohrungen 17 können auch am unteren Ende des Spaltes 13 im bereits horizontalen Randbereich der Abdeckplatte 5 münden. Die Durchmesser bzw. Spaltbreiten der Gasaustrittsmündungen 18 sind kleiner als 5 mm, vorzugsweise kleiner als 3 mm.The cover plate 5 is arranged such that between the cover plate and the Surfaces 11 of the casting rolls 2, a gap 13 of small width is present, which with a optionally resilient sealing lip 14, a labyrinth seal, etc. against the Surfaces 11 of the two casting rolls 2 on the outside to avoid air entry is sealed. The edge of the cover plate 5 directed against the casting rolls 2 is in each case on the surfaces 11 of the casting rolls 2 adapted so that here a gap 13 with approximately constant Width is formed. Inert gas is fed in via this gap 13, etc. about Gas supply lines 15 connected to the cover plate 5 by means of quick couplings 16 are attached, advantageously a quick coupling 16 simultaneously for two or more Gas supply lines 15 is provided. What is important is a tight and precise connection, which can also be blunt because the gas pressures in the individual gas supply lines 15 do not have to be the same with each other. In continuation of the gas supply lines 15 are In the cover plate bores 17 (there could also be slots) provided in the Gap 13 between the cover plate and the respective casting roll 2 via a Gas outlet mouth 18 open. These holes 17 can also at the lower end of Gap 13 open into the already horizontal edge area of the cover plate 5. The Diameter or gap widths of the gas outlet openings 18 are smaller than 5 mm, preferably less than 3 mm.

Die Oberflächen 11 der Gießwalzen 2 werden in Abhängigkeit ihres Zustandes mit Inertgas bespült, aus welchem Grund die Oberflächen 11 der Gießwalzen 2 mittels einer Einrichtung 19 zum Beobachten derselben versehen sind. Gemäß dem dargestellten Ausführungsbeispiel ist ein Profilsensor 19 gegen jeweils eine Oberfläche 11 einer Gießwalze 2 gerichtet, mit dem integral über die Längserstreckung jeder Gießwalze 2 ein Temperaturprofil gemessen wird. Der Profilsensor 19 ist mit einer Rechen- und Regeleinheit 20 gekoppelt, u.zw. derart, daß nebeneinander angeordneten und über die Längserstreckung der Gießwalzen 2 verteilten Teil-Flächenbereichen a, b, c, ....., d.h. einzelnen benachbarten Umfangszonen a, b, c, ....., jeweils Temperaturwerte bzw. Temperaturmittelwerte zugeordnet werden können.Depending on their condition, the surfaces 11 of the casting rolls 2 are filled with inert gas washed, for which reason the surfaces 11 of the casting rolls 2 by means of a device 19 are provided for observing the same. According to the illustrated embodiment is a profile sensor 19 directed against a surface 11 of a casting roll 2, respectively the temperature profile integrally measured over the longitudinal extent of each casting roll 2 becomes. The profile sensor 19 is coupled to a computing and control unit 20, etc. so that arranged side by side and distributed over the longitudinal extent of the casting rolls 2 Partial surface areas a, b, c, ....., i.e. individual adjacent circumferential zones a, b, c, ....., temperature values or average temperature values can be assigned.

Anstelle des Profilsensors 19 könnte auch ein Strahlungssensor zum Ermitteln von Glattstellen an den Oberflächen 11 der Gießwalzen 2 vorgesehen sein.Instead of the profile sensor 19, a radiation sensor for determining Smoothing points can be provided on the surfaces 11 of the casting rolls 2.

Um einzelne nebeneinander liegende Umfangszonen a, b, c .... jeder Gießwalze 2 jeweils für sich und unabhängig voneinander mittels Inertgas beeinflussen zu können, ist gemäß dem dargestellten Ausführungsbeispiel eine Vielzahl von Gaszuführungseinrichtungen 21 vorgesehen, wobei jeweils eine Gaszuführungseinrichtung 21 einer Umfangszone a, b, c, ....... einer Gießwalze 2 zugeordnet ist.To each of adjacent circumferential zones a, b, c .... each casting roll 2 for To be able to influence one another independently of one another using inert gas is according to the The illustrated embodiment shows a plurality of gas supply devices 21 provided, each with a gas supply device 21 of a peripheral zone a, b, c, ....... a casting roll 2 is assigned.

Für die Gasbespülung sind Druckgasspeicher 22 für unterschiedliche Gase vorgesehen; gemäß dem dargestellten Ausführungsbeispiel z.B. drei Druckgasspeicher 22, wobei jeder der Druckgasspeicher 22 mit einem bestimmten Gas gefüllt ist, z.B. einer mit Stickstoff, einer mit Argon und einer mit Helium. Von jedem dieser Druckgasspeicher 22 führen Gasleitungen 24 zu einer jeder der Umfangszonen a, b, c, ..... zugeordneten Mischkammer 23, wobei mittels in den Gasleitungen 24 eingebauter Drossel- und Absperrorgane 25 in jeder der Mischkammern 23 eine spezifische Gaszusammensetzung, gebildet aus einem oder mehreren der in den Druckgasspeichern 22 enthaltenen Gase, eingestellt werden kann. Diese Drossel- und Absperrorgane 25 sind mit dem Regler 20 gekoppelt und werden von diesem angesteuert, so daß für jede Mischkammer 23 und damit für jede der Umfangszonen a, b, c, ..... eine spezielle Gaszusammensetzung, entsprechend dem über die Längserstreckung jeder Gießwalze 2 vorhandenen Temperaturprofil, eingestellt werden kann. Die Ansteuer-Sollwerte ermittelt der Regler 20 aufgrund der vom jeweiligen Sensor 19 erfaßten Temperaturprofile.Compressed gas stores 22 for different gases are provided for gas purging; according to the illustrated embodiment e.g. three compressed gas stores 22, each the compressed gas storage 22 is filled with a certain gas, e.g. one with nitrogen, one with argon and one with helium. Lead from each of these compressed gas stores 22 Gas lines 24 to a mixing chamber assigned to each of the peripheral zones a, b, c, ..... 23, wherein in the gas lines 24 built-in throttling and shut-off devices 25 in each of the mixing chambers 23 has a specific gas composition formed from or several of the gases contained in the compressed gas stores 22 can be set. This Throttle and shut-off devices 25 are coupled to the controller 20 and are by this controlled so that for each mixing chamber 23 and thus for each of the peripheral zones a, b, c, ..... a special gas composition, corresponding to that over the longitudinal extent of each Casting roller 2 existing temperature profile, can be adjusted. The control setpoints determines the controller 20 based on that detected by the respective sensor 19 Temperature profiles.

Von jeder der Mischkammern 23 führt eine Gaszuführungsleitung 15 zu einer am Rand der Abdeckplatte 5 vorgesehenen Gasaustrittsmündung 18, wodurch die Oberflächen 11 der Gießwalzen 2 jeweils umfangszonenweise mit voneinander unterschiedlichen Gaszusammensetzungen, also mit - in Längsrichtung der Gießwalzen 2 gesehen - örtlich unterschiedlichen Gasmischungen beaufschlagbar sind. Es können auch mehrere nebeneinander angeordnete Gasaustrittsmündungen 18 (z.B. in Form von Bohrungen) zu einer Gruppe zusammengefaßt sein und von nur einer Gaszuführungsleitung 15 versorgt werden, wodurch breitere Umfangszonen a, b, c, ..... gebildet werden, also größere Flächenbereiche der Oberflächen 11 mit jeweils einer Gasmischung versorgt werden. Somit ergibt sich, daß eine Gaszuführungseinrichtung zur Gas-Versorgung einer Umfangszone a, b, c, ..... von Gasleitungen 24 (Anzahl entsprechend der Anzahl der Druckgasspeicher 22) Drossel- und Absperrorganen 25, einer Mischkammer 23, einer Gaszuführungsleitung 15 und mindestens einer Gasaustrittsmündung 18 gebildet ist.From each of the mixing chambers 23, a gas supply line 15 leads to one at the edge of the Cover plate 5 provided gas outlet mouth 18, whereby the surfaces 11 of the Casting rolls 2 each with different circumferential zones Gas compositions, ie with - seen in the longitudinal direction of the casting rolls 2 - locally different gas mixtures can be acted upon. You can also have several gas outlet openings 18 arranged next to one another (e.g. in the form of bores) be grouped together and supplied by only one gas supply line 15 are, whereby wider circumferential zones a, b, c, ..... are formed, ie larger Surface areas of the surfaces 11 are each supplied with a gas mixture. Consequently it follows that a gas supply device for supplying gas to a peripheral zone a, b, c, ..... of gas lines 24 (number corresponding to the number of compressed gas stores 22) Throttling and shut-off devices 25, a mixing chamber 23, a gas supply line 15 and at least one gas outlet mouth 18 is formed.

Die Zuströmung des Gases sollte mit Auftreffdrücken von mindestens 1,05 bar, vorzugsweise mehr als 1,5 bar bis hin zu 2 bar, erfolgen, wobei die Achsen der Gasaustrittsmündungen 18 im wesentlichen normal zur Gießwalzenoberfläche stehen können, aber in oder gegen die Bewegungsrichtung der Walzenoberfläche geneigt sind, u.zw. im Bereich ± 60°. Die Wahl der Breiten der Umfangszonen a, b, c, ..... richtet sich nach der eventuell vorhandenen Störanfälligkeit des Gießverfahrens, die wiederum weitgehend durch die Verfahrensparameter bestimmt wird.The inflow of the gas should be at least 1.05 bar, preferably more than 1.5 bar up to 2 bar, take place, the axes of the Gas outlet openings 18 are substantially normal to the casting roll surface can, but are inclined in or against the direction of movement of the roller surface, u.zw. in the range of ± 60 °. The choice of the widths of the peripheral zones a, b, c, ..... depends after the possible susceptibility of the casting process to malfunction, which in turn is largely determined by the process parameters.

Gemäß einer anderen Ausführungsform der Erfindung werden nicht die Oberflächen 11 der Gießwalzen 2 direkt beobachtet, sondern es wird durch eine direkte Beobachtung einer der Oberflächen 26 oder beider Oberflächen 26 des Bandes 1 auf den Zustand der Oberflächen 11 der Gießwalzen 2 geschlossen. Daher sind bei dieser Ausführungsform die Sensoren 19 gegen die Oberflächen 26 des Bandes 1 gerichtet, u.zw. möglichst unmittelbar nach Austritt des Bandes 1 aus dem Gießspalt 3, wie dies in Fig. 1 mit strichpunktierten Linien veranschaulicht ist.According to another embodiment of the invention, surfaces 11 of FIG Casting rolls 2 observed directly, but it is by direct observation of one of the Surfaces 26 or both surfaces 26 of the tape 1 on the condition of the surfaces 11 of the casting rolls 2 closed. Therefore, in this embodiment, the sensors 19 directed against the surfaces 26 of the belt 1, etc. as soon as possible after leaving the tape 1 from the casting gap 3, as shown in Fig. 1 with dash-dotted lines is illustrated.

Die Erfindung beschränkt sich nicht auf die in der Zeichnung dargestellten Ausführungsbeispiele, sondern kann in verschiedener Hinsicht modifiziert werden. Beispielsweise ist es möglich, die der Erfindung zugrunde liegende Aufgabe auch dadurch zu lösen, daß nicht die örtlich auftretende Temperatur an den Gießwalzenoberflächen 11 gemessen wird, sondern daß die örtliche Oberflächenrauhigkeit der Gießwalzen 2 beobachtet wird. Auch kann man Rückschlüsse durch Beobachten der Oberflächenreflexions-Eigenschaften der Gießwalzen 2 bzw. des Bandes 1 mittels Bilderkennungssystemen ziehen, oder es können örtlich unterschiedliche Verfärbungen der Oberflächen der Gießwalzen 2 beobachtet werden und für die Wahl der gegen die Umfangszonen zu spülenden Gaszusammensetzung herangezogen werden.The invention is not limited to that shown in the drawing Embodiments, but can be modified in various ways. For example, it is also possible to achieve the object on which the invention is based to solve that not the locally occurring temperature on the casting roll surfaces 11th is measured, but that the local surface roughness of the casting rolls 2 is observed becomes. One can also draw conclusions by observing the surface reflection properties pulling the casting rolls 2 or the belt 1 by means of image recognition systems, or locally different discolorations of the surfaces of the casting rolls 2 be observed and for the choice of those to be washed against the peripheral zones Gas composition can be used.

Eine Beeinflussung der Oberflächen 11 der Gießwalzen 2 kann auch dadurch geschehen, daß anstelle der örtlichen Veränderung der Gaszusammensetzung auch zusätzlich hierzu örtlich unterschiedliche Gasmengen und/oder örtlich unterschiedliche Gasdrücke eingestellt werden.The surfaces 11 of the casting rolls 2 can also be influenced in that instead of the local change in the gas composition, also locally different gas quantities and / or locally different gas pressures can be set.

Fig. 4 gibt in Diagrammform schematisch die unterschiedliche Beaufschlagung von Umfangszonen a, b, c, ..... mit unterschiedlichen Gaszusammensetzungen A, B, C, ..... wieder. Auf der Abszisse des Diagrammes sind die einzelnen nebeneinander liegenden Umfangszonen a, b, c, ..... aufgetragen. Sie entsprechen in ihrer Summe der Länge einer Gießwalze 11. In Ordinatenrichtung sind die den einzelnen Umfangszonen a, b, c, ..... zugeordneten Temperaturwerte aufgetragen und es ergibt sich bei einer sehr feinen Messung ein Temperaturprofil entsprechend der Linie 27. Weiters sind in Ordinatenrichtung noch Gasmengenwerte aufgetragen, mit denen die einzelnen Umfangszonen a, b, c, ..... je Zeiteinheit bespült werden. Die Angaben A, B, C, ..... beziehen sich auf unterschiedliche Gaszusammensetzungen, wie sie durch Mischen der in den Druckgasspeichern 22 enthaltenen unterschiedlichen Gase gebildet werden können. Es ist zu erkennen, daß jedem Temperaturmittelwert einer Umfangszone a, b, c, ..... (die Mittelwerte sind durch strichlierte Linien veranschaulicht) eine bestimmte Gaszusammensetzung und eine bestimmte Gasmenge zur Beaufschlagung der Umfangszonen a, b, c, ..... zugeordnet wird.Fig. 4 shows diagrammatically the different loading of Circumferential zones a, b, c, ..... with different gas compositions A, B, C, ..... again. The individual ones lying next to each other are on the abscissa of the diagram Circumferential zones a, b, c, ..... plotted. Their sum corresponds to the length of one Casting roller 11. In the ordinate direction, the individual circumferential zones a, b, c, ..... assigned temperature values and it results in a very fine measurement a temperature profile according to line 27. Furthermore, there are still in the ordinate direction Gas quantity values plotted with which the individual peripheral zones a, b, c, ..... each Time unit can be flushed. The information A, B, C, ..... refer to different Gas compositions, such as those obtained by mixing those in the compressed gas stores 22 contained different gases can be formed. It can be seen that everyone Average temperature of a peripheral zone a, b, c, ..... (the average values are indicated by dashed lines Lines illustrates) a certain gas composition and a certain one Gas quantity is assigned to act on the peripheral zones a, b, c, .....

Die Erfindung beruht auf der Idee, daß eine örtlich lokale Beeinflussung einer Teiloberfläche der Gesamtoberfläche 11 einer Gießwalze 2 durch örtlich unterschiedlich zugeführte Gasgemische bzw. Gasmengen möglich ist, u.zw. durch Zuführung dieser Gasgemische knapp oberhalb des Schmelzbadspiegels 9. Es hat sich anhand von Versuchen herausgestellt, daß verschiedene Gasgemische, die zu unterschiedlichen Erstarrungsraten führen, auch in nahe beieinander liegenden Bereichen, d.h. auch in unmittelbar nebeneinander liegenden Bereichen des Schmelzbadspiegels 9 eingebracht werden können und trotzdem eine unterschiedliche Beeinflussung von nebeneinander liegenden Oberflächenzonen bzw. Umfangszonen a, b, c, ..... der Gießwalzen 2 möglich ist, wodurch eine Verungleichmäßigung der Oberflächen 11 der Gießwalzen 2 hintangehalten werden kann. The invention is based on the idea that a local local influence on a partial surface the total surface 11 of a casting roll 2 by locally differently supplied Gas mixtures or gas quantities are possible, etc. by supplying these gas mixtures just above the melt pool level 9. Experiments have shown that that different gas mixtures, which lead to different solidification rates, also in areas close to each other, i.e. also in immediately adjacent Can be introduced areas of the molten pool level 9 and still a different influence of adjacent surface zones or Circumferential zones a, b, c, ..... of the casting rolls 2 is possible, whereby a Uneven surfaces 11 of the casting rolls 2 can be stopped.

Hierdurch ist eine Reparatur bzw. Erneuerung der Oberflächen 11 der Gießwalzen 2 erst nach erheblich längeren Gußsequenzen bzw. wesentlich höheren Produkttonnagen als bisher erforderlich.This means that the surfaces 11 of the casting rolls 2 are only repaired or renewed after considerably longer casting sequences or significantly higher product tonnages than before required.

Es hat sich anhand eines Versuches gezeigt, daß mit der Verwendung von 100 % Argon die Erstarrungsgeschwindigkeit um bis zu 30 % geringer gehalten werden kann als mit 100 % Helium. So wurde festgestellt, daß Zonen an den Oberflächen 11 der Gießwalzen 2 mit einer rotbräunlichen Verfärbung bzw. Fleckigkeit durch verstärktes Zuführen von Helium, das die Erstarrungsrate lokal stark erhöht, wiederum entfernt werden können; es kommt zu einem Abschwächen und Verschwinden der Rot-Braun-Färbung. Weiters wurde festgestellt, daß in Bereichen von Glanzfleckigkeit durch verstärktes Zuführen von Argon die Erstarrungsrate reduziert werden kann, so daß die Glanzfleckigkeit wiederum verschwindet. Generell werden durch das erfindungsgemäße Verfahren über die Längserstreckung der Gießwalzen 2 variierende Gießwalzenoberflächenzustände hintangehalten, und die Streubreite der Oberflächenbeschaffenheits-Unterschiede während bzw. zufolge des Gießvorganges wächst nicht an, sondern es wird bei Auftreten lokaler Veränderungen der Oberflächen durch Änderung des örtlich angewendeten Gasgemisches der Wärmeübergang derart beeinflußt, daß sich diese Veränderungen der Oberfläche nicht verstärken, sondern wieder abklingen. Unter Oberflächenbeschaffenheit ist. bzw. sind beispielsweise die Rauhigkeit, optische Reflexionseigenschaften, Verfärbungen, Fleckigkeit, Präsenz von Riefen oder Grübchen etc. zu verstehen.It has been shown in an experiment that the use of 100% argon Solidification rate can be kept up to 30% lower than with 100% Helium. It was found that zones on the surfaces 11 of the casting rolls 2 with a reddish brown discoloration or blotchiness due to the increased supply of helium, which the Solidification rate locally increased, in turn can be removed; it comes to one Reduction and disappearance of the red-brown color. It was also found that in Areas of glossy spots by increasing the supply of argon the solidification rate can be reduced so that the shiny spots disappear again. As a general rule are by the inventive method over the longitudinal extent of the casting rolls 2nd varying casting roll surface states are held back, and the spread of the Surface texture differences grow during or after the casting process not on, but it is caused by local changes in the surface Change in the locally used gas mixture affects the heat transfer in such a way that these changes in the surface do not intensify, but subside again. Under surface texture is. or are, for example, the roughness, optical Reflective properties, discolouration, blotchiness, presence of grooves or dimples etc. to understand.

Erfindungsgemäß wird zum einen die Erstarrungsstruktur, insbesondere die mittige globulitisch-dentrische Erstarrungsstruktur, des erzeugten Bandes 1 gleichmäßiger über die gesamte Breite und zum anderen das Rekonditionieren (Vergleichmäßigen der Oberflächen 11 der Gießwalzen 2) immer erst nach einer größeren Anzahl von Güssen erforderlich. Somit wird nicht nur die Standzeit der Oberflächenschicht, sondern insbesondere auch die Standzeit der gesamten Gießwalzen 2 deutlich erhöht.According to the invention, on the one hand the solidification structure, in particular the central one globulitic-dentric solidification structure, the band 1 produced more evenly over the entire width and secondly the reconditioning (equalizing the surfaces 11 of the casting rolls 2) always required after a larger number of castings. Consequently not only the service life of the surface layer, but especially the Service life of the entire casting rolls 2 increased significantly.

Claims (27)

  1. Process for continuously casting a thin strip (1), in particular a steel strip, preferably having a thickness of less than 10 mm, in a two-roll process, wherein metal melt (7) is cast into a casting gap (3) formed by two casting rolls (2) in the thickness of the strip (1) to be cast while forming a melt bath (6) and the surfaces (11) of the casting rolls (2) above the melt bath (6) are swept with an inert gas or an inert gas mixture, characterized in that gas sweeping of the surfaces (11) of the casting rolls (2) is carried out over the longitudinal extent of the casting rolls (2) in a locally different manner, in that the surfaces (11) of the casting rolls (2) are observed over their longitudinal extent with respect to locally different conditions and in that gas sweeping of the surfaces (11) of the casting rolls (2) is carried out as a function of what has been observed.
  2. Process according to Claim 1, characterized in that locally different gas sweeping is carried out with locally different gas compositions.
  3. Process according to either of Claims 1 or 2, characterized in that locally different gas sweeping is carried out with locally different gas amounts.
  4. Process according to one or more of Claims 1 to 3, characterized in that locally different gas sweeping is carried out with locally different gas pressures.
  5. Process according to one or more of Claims 1 to 4, characterized in that locally different surface roughness conditions of the casting rolls (2) are observed.
  6. Process according to one or more of Claims 1 to 5, characterized in that locally different surface reflection property conditions of the casting rolls (2) are observed.
  7. Process according to one or more of Claims 1 to 6, characterized in that locally different discolorations of the surfaces (11) of the casting rolls (2) are observed.
  8. Process according to one or more of Claims 1 to 7, characterized in that the surfaces (11) of the casting rolls (2) in the direction of their longitudinal extent are divided into consecutively arranged zones (a, b, c, ...) and in that each zone (a, b, c, ...) is observed with respect to the condition of the surfaces (11), and in that locally different gas sweeping is effected in zones, i.e. by gas sweeping that is uniform and constant within each zone (a, b, c, ...).
  9. Process according to Claim 8, characterized in that at least three adjacently located zones (a, b, c, ...) are formed.
  10. Process according to Claim 8, characterized in that up to 40 adjacently located zones (a, b, c, ...) are formed.
  11. Process according to one or more of Claims 1 to 10, characterized in that the observation of the surfaces (11) of the casting rolls (2) is carried out by receiving electromagnetic waves emitted and/or reflected from the surfaces (11), in particular in the range of visible light and/or in the range of heat radiation.
  12. Process according to one or more of Claims 1 to 11, characterized in that the observation of the surfaces (11) of the casting rolls (2) is effected indirectly by observing the cast strip (1) over its width after the emergence of the strip (1) from the casting gap (3).
  13. Process according to Claim 12, characterized in that at least one surface (26) of the strip (1) is observed over its width immediately after the emergence of the strip (1) from the casting gap (3), wherein electromagnetic waves emitted and/or reflected from the surface (26) of the strip (1), in particular in the range of visible light and/or in the range of heat radiation, are received.
  14. Process according to one or more of Claims 1 to 13, characterized in that gas sweeping is carried out at a pressure on the gas outlet openings (18) of at least 1.05 to a maximum of 2 bar and, preferably, at least 1.5 bar.
  15. Process according to one or more of Claims 1 to 14, characterized in that gas sweeping is carried out at a gas outlet speed on the gas outlet openings (18) of at least 0.2 m/s and, preferably, at least 1.5 m/s.
  16. Arrangement for continuously casting a thin strip (1) by applying the process according to one or more of claims 1 to 15, comprising a continuous casting mould formed by two casting rolls (2) defining a casting gap (3), wherein the width of the casting gap (3) corresponds to the thickness of the strip (1) to be cast and a melt bath receptacle (4) covered by a lid (5) is formed between the casting rolls (2) above the casting gap (3), a gas feeding device (21) feeding an inert gas to the casting rolls (2) and having at least one gas outlet opening (18) just above the melt bath (6) present between the casting rolls (2), and a control unit (20) for influencing the gas feed to the casting rolls (2), characterized in that several gas feeding devices (21) are provided, wherein each gas feeding device (21) is associated with a partial surface area (a, b, c, ...) of a casting roll (2) and each partial surface area (a, b, c, ...) is feedable with gas by means of the associated gas feeding device (21) as a function of a value allocated to said partial surface area (a, b, c, ...) by the control unit (20), and a device (19) for observing partial surface areas (a, b, c, ...) of the surfaces (11) of the casting rolls (2) is provided, which is coupled with the control unit (20).
  17. Arrangement according to Claim 16, characterized in that each gas feeding device (21) comprises several closely adjacent gas outlet openings (18).
  18. Arrangement according to Claim 16 or 17, characterized in that the gas feeding devices (21) are connected to two or more gas reservoirs (22) each containing a different gas via gas ducts (24) equipped with throttle or shut-off members (25), wherein the gas ducts (24) of each gas feeding device (21) open into a mixing device (23), preferably a mixing chamber (23), associated with the gas feeding device (21) and from which at least one gas feeding duct in each case leads to the gas outlet opening(s) (18) associated with the gas feeding device (21).
  19. Arrangement according to one or more of Claims 16 to 18, characterized in that the devices for observing the surfaces (11) of the casting rolls (2) are formed by sensors (19) directed towards the surfaces (11) of the casting rolls (2).
  20. Arrangement according to Claim 19, characterized in that a profile sensor (19) is provided as the sensors for each of the casting rolls (2) for the purpose of an integral observation of the surfaces (11) of the casting rolls (2) over their longitudinal extent, preferably over their total longitudinal extent.
  21. Arrangement according to one or more of Claims 16 to 20, characterized in that the devices for observing the surfaces (11) of the casting rolls (2) are formed by sensors (19) directed towards at least one of the surfaces (26) of the cast strip (1).
  22. Arrangement according to one or more of Claims 16 to 21, characterized in that two or more, preferably at least three, devices (19) for observing the surfaces (11) of the casting rolls (2) are distributed over the longitudinal extent of the casting rolls (2), each of said devices being separately coupled with a respective gas feeding device (21) via a control unit (20).
  23. Arrangement according to one or more of Claims 16 to 22, characterized in that the axes of the gas outlet openings (18) are oriented in the circumferential direction towards the surfaces (11) of the casting rolls (2) at an angle α with a range of between +60° and -60° and, preferably, between +20° and -30°.
  24. Arrangement according to one or more of Claims 16 to 23, characterized in that the surfaces (11) of the casting rolls (2) have a roughness of more than 4 µm and, preferably, more than 8 µm.
  25. Arrangement according to one or more of Claims 16 to 24, characterized in that the surfaces (11) of the casting rolls (2) are provided with dimples whose depths are between 10 and 100 µm and whose diameters are between 0.2 and 1.0 mm.
  26. Arrangement according to Claim 25, characterized in that dimples contact one another, preferably 5 to 20% of the dimples.
  27. Arrangement according to Claim 26, characterized in that more than 20% of the dimples contact one another.
EP99915539A 1998-03-25 1999-02-26 Method for the continuous casting of a thin strip and device for carrying out said method Expired - Lifetime EP1068035B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT0053398A AT408198B (en) 1998-03-25 1998-03-25 METHOD FOR CONTINUOUSLY CASTING A THIN BELT AND DEVICE FOR IMPLEMENTING THE METHOD
AT53398 1998-03-25
PCT/EP1999/001249 WO1999048635A1 (en) 1998-03-25 1999-02-26 Method for the continuous casting of a thin strip and device for carrying out said method

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EP1068035B1 true EP1068035B1 (en) 2002-09-04

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AT408198B (en) 2001-09-25
ZA992288B (en) 1999-10-04

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