EP2855047B1 - Method for operating a conveyor belt of a strip casting system, and strip casting system - Google Patents

Method for operating a conveyor belt of a strip casting system, and strip casting system Download PDF

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Publication number
EP2855047B1
EP2855047B1 EP13722768.2A EP13722768A EP2855047B1 EP 2855047 B1 EP2855047 B1 EP 2855047B1 EP 13722768 A EP13722768 A EP 13722768A EP 2855047 B1 EP2855047 B1 EP 2855047B1
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EP
European Patent Office
Prior art keywords
conveyor belt
belt
transport belt
casting
heating
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EP13722768.2A
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German (de)
French (fr)
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EP2855047A1 (en
Inventor
Walter Trakowski
Jörg BAUSCH
Reiner PÜRLING
Jochen Wans
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SMS Group GmbH
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SMS Group GmbH
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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
    • B22D11/0637—Accessories therefor
    • B22D11/0665—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating
    • B22D11/0671—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating for heating or drying

Definitions

  • the present invention relates to a method for operating a conveyor belt of a strip casting plant, and a strip casting plant for casting metals.
  • Such a method and a corresponding continuous casting is, for example, from the EP 326 788 A1 known, according to which the two conveyor belts or mold belts are handled by a federal government and are wound after use again on a bunch.
  • the band is stretched while passing through the casting chamber to counteract thermally induced deformations of the mold belt.
  • the strip casting process typically leads to a deformation of the conveyor belt, which results inter alia from the fact that, when the liquid metal is applied to the respective conveyor belt while the cooling capacity is high, the liquid metal is in flutter contact with the conveyor belt Conveyor belt occurs.
  • Flutter contact means here that the liquid metal strip rapidly solidifies on contact with the strongly cooled conveyor belt and accordingly forms a first casting skin towards the conveyor belt. Due to the thermal contraction of the casting skin, which is associated with a detachment of the casting skin from the conveyor belt, the casting skin loses the intense cooling, which is caused by the direct contact with the cooled conveyor belt, and then melts again by the liquid metal located behind the skin immediately , It comes accordingly to re-contact between the liquid metal and the conveyor belt. This results in a flutter contact between the metal and the cooled conveyor belt until the formed casting skin is so stable that it does not melt again, but remains created by its own weight or metallostatic pressure from the still liquid metal core on the conveyor belt.
  • the proposed method or devices are used accordingly to heat a conveyor belt before the casting process or during the casting so targeted that a deformation of the conveyor belt is counteracted.
  • the method of operating a conveyor belt of a strip caster includes the steps of performing a profile measurement of the conveyor belt to detect the position and extent of deformations of the conveyor belt, and selectively heating the respective detected deformation depending on the extent of deformation, deformation reduce and / or eliminate by subsequent thermal contraction.
  • the profile measurement of the conveyor belt and the corresponding detection of the position and extent of deformations can be correspondingly located in the conveyor belt after a casting dents, which are caused by a flow of the material of the conveyor belt, detected and their relative position to the conveyor belt and their extent be recorded.
  • the subsequent step of selectively heating the respective deformations that is to say in particular the detected bumps, the respective deformation can then be reduced by the corresponding subsequent thermal contraction during the cooling of the previously strongly heated selective regions of the conveyor belt or pulled completely out of the belt.
  • the profile measurement is advantageously carried out in a distance method, in which case it can be detected whether bulges present in the conveyor belt and on Which position of the conveyor belt these bumps are present with which extent.
  • the profile measurement can also be determined with two opposing distance measurements by means of a differential method, or it can be carried out by means of a laser scanning or measuring curtains with a certain width a corresponding profile measurement.
  • Other non-contact distance measuring methods such as radar or ultrasound, may also be used for profile measurement. Accordingly, in this way, coupled with the respective tape position, the extent and the position of deformations and in particular of bumps in the conveyor belt determined.
  • bulge is meant here a deformation which stands out from a surrounding, substantially flat surface.
  • a bump is in particular no distortion of the conveyor belt.
  • calculation methods of bi-cubic splines for determining the position, depth and extent of the respective deformations and in particular the bumps can be used in the measuring process.
  • the selective heating of the detected deformations is preferably carried out via a selective loading of the conveyor belt with a magnetic field via induction coils, wherein the eddy currents produced in the conveyor belt correspondingly ensure a selective heating of the conveyor belt. In this way, the respective deformations in the conveyor belt can be reduced or completely pulled out of the subsequent thermal contraction.
  • the induction is preferably applied via an array of induction coils on the conveyor belt, which is arranged in a free region of the conveyor belt.
  • the array of induction coils is preferably controlled such that precisely those regions of the conveyor belt in which the deformation was detected are selectively heated. This is independent of whether it is circular bumps or elongated bumps. Elongated bulges, which do not extend in the strip running direction, can also be selectively and selectively heated via a corresponding control of the coil array.
  • a selective heating is applied by a chronological sequence of at least two voltage pulses or current pulse bursts and / or a temporal sequence of the control of at least two different induction coils.
  • the time sequence of the voltage pulses, current pulse bursts or the activation of the different induction coils is determined on the basis of the determined bulge shape, preferably the bump shape determined via the bi-cubic splines, such that a targeted heating of the transport belt takes place in the region of the determined bulge.
  • the selective heating of the conveyor belt and possibly also the profile measurement is carried out in a region of the conveyor belt which has a higher strip tension or a smaller strip tension in relation to the casting area.
  • the pulling out of bumps can be positively influenced or even smaller bumps can be detected by means of a smaller strip tension.
  • a strip casting plant for casting flat metal strips with at least one circulating conveyor belt, wherein at least one measuring device for profile measurement of the conveyor belt is provided to detect the position and extent of deformations of the conveyor belt, and at least one heating device for selectively heating the respective detected deformation is provided depending on the extent of the deformation.
  • the measuring device allows a profile measurement of the conveyor belt such that deformations can be detected, for example for the detection of dents in the conveyor belt, which originate from a previous casting operation.
  • the measuring device makes it possible to determine the tape position, ie the position of the respective deformation on the conveyor belt, as well as the extent of the respective deformation, for example the diameter or the shape of a bulge, and their depth.
  • the region in which the respective deformation was detected in the conveyor belt can then be selectively heated.
  • the selective heating is preferably controlled via a corresponding control device so that the respective deformation is pulled out of the conveyor belt by means of a thermal contraction during the cooling process following the heating.
  • the introduced heat energy or the temperature of the heating to be achieved in the conveyor belt for example, also be controlled depending on the extent of the respective deformation or the depth of the respective deformation, such that the most accurate and effective reduction or removal of the respective deformation of the conveyor belt allows becomes.
  • this is also possible in the method described above. In this way it can be achieved that the conveyor belt before subsequent casting process again provides a completely flat surface to which then the metallic melt can be abandoned.
  • the induction coils may have diameters between 10 and 30 cm and be arranged correspondingly next to each other in rows slightly offset from one another over the entire width of the conveyor belt.
  • a set of tensioning devices preferably two S-rollers, are provided, by means of which a section of the conveyor belt lying between these two tensioning devices either with a higher tension than the tension applied in the casting area or with a lower tension than the applied in the casting area train can be acted upon.
  • the heating device and particularly preferably also the measuring device is preferably arranged in order to be able to measure the conveyor belt with respect to its profile, even with different tractions, and to be able to apply heat energy selectively. To pull out bumps from the conveyor belt high tension is conducive. To measure even small bumps in the conveyor belt low tension is conducive. According to the setting of the respective S-rollers in the arranged between the S-rollers area a corresponding Zugregime can be adjusted.
  • FIG. 1 shows a schematic side view of a portion of a strip casting plant 1 for casting a flat metal strip 2, wherein a feed system 20 is provided, via which the molten metal is applied to a conveyor belt 3.
  • the conveyor belt 3 is a circulating, that is endless conveyor belt, which is circumferentially guided over two upper rollers 30, 32 and a tension roller 34.
  • the molten metal is fed via the feeding system 20 onto the conveyor belt 3 to form the flat metal strip 2.
  • a spray water cooling box 36 which effectively cools the conveyor belt 3 from below by means of a corresponding water supply.
  • cooling capacities of about 7 to 8 MW / m 2 are achieved in the region in which the molten metal is fed to the conveyor belt 3 via the feed system 20.
  • the spray water cooling box 36 further provides a negative pressure, by means of which the conveyor belt 3 can be guided largely flat to provide a flat support surface for the molten metal.
  • a measuring device 4 is provided for determining these deformations, by means of which the position of the respective deformation and its extent can be detected.
  • the respective position of the respective deformation on the conveyor belt 3, as well as their extent, that is, for example, the diameter, the longitudinal extent and / or the depth or height, are on the Passing measuring device 4 to a central, not shown evaluation and control device.
  • the measuring device 4 can be a non-contact measuring device, for example via a meander-shaped scanning process by means of a laser, through measuring curtains across the width of the conveyor belt 3, through radar or ultrasound or via imaging methods.
  • the heating device 5 preferably consists of an array of induction coils, which applies the heating energy in exactly the areas on the conveyor belt 3, in which the measuring device 4 has previously detected the corresponding deformations. Accordingly, the measuring device 4, viewed in the direction of tape travel, is arranged in front of the heating device 5.
  • heating device 5 One possible embodiment of the heating device 5 will be described below with reference to FIGS FIGS. 3 to 6 described.
  • FIG. 2 is a variant of in FIG. 1 shown here, wherein the measuring device 4 here one of the first measuring device 40 opposite second measuring device 42 which measure both from the top and from the bottom of the conveyor belt 3 with respect to the respective deformations.
  • the measuring device 4 here one of the first measuring device 40 opposite second measuring device 42 which measure both from the top and from the bottom of the conveyor belt 3 with respect to the respective deformations.
  • an exact value for the respective deformation and in particular for the respective bulge present in the conveyor belt 3 can then be calculated from the respective measured data of the upper and lower measuring device 40, 42.
  • the provision of the differential measuring method via the measuring devices 40, 42 arranged on opposite sides of the conveyor belt 3 can substantially eliminate artifacts which occur, for example, due to belt vibrations, so that only the deformations inherent in the belt can be measured via this measuring device.
  • the induction coils 5 and the array of induction coils 5 are then controlled again so that heat is selectively introduced into the conveyor belt 3 at the positions at which a deformation has been determined via the measuring device 40, 42.
  • FIG. 3 shows a schematic circuit arrangement for driving an induction coil from the array 5 of induction coils.
  • a single induction coil 50 is then acted upon via a power switch 60, for example an inverter, with a corresponding current pulse when a selective or local heating of the conveyor belt 3 is to be achieved.
  • a power switch 60 for example an inverter
  • the power switch 60 is preceded by a capacitor group or a standard battery 62, which serves for the intermediate storage or for buffering the current requirement of the induction coil 50.
  • the capacitor group or standard battery 62 are continuously charged via a corresponding constant current source 64, the energy is then retrieved only via the power switch 60, when in fact a deformation of the conveyor belt 3 in the region of the corresponding, connected to the circuit breaker 60 induction coil 50 has been detected.
  • FIG. 4 In an alternative, there is shown a switching device which does not apply a single voltage pulse to the induction coil 50 via the corresponding power switch 60, as in FIG. 3 but a Stromimpulsburst can be shown to allow correspondingly a very strong heating of the conveyor belt in a very short period of time or a very small space area.
  • the conveyor belt 3 which has bumps of different sizes.
  • the bumps are provided with the reference numeral 340.
  • the bumps for example, as in FIG. 6 can also be elongated bumps which extend in different directions.
  • a heating device 5 in the form of an array of different induction coils 50 is provided.
  • the induction coils are, as seen in the tape running direction, arranged in rows, which are slightly offset from each other.
  • FIGS. 5 and 6 shown four rows of induction coils 50, which extend substantially over the entire width of the conveyor belt 3 away, and which are each offset by a sixth of the coil width. In this way, with the induction coil array each point on the conveyor belt 3 selectively and very selectively apply thermal energy.
  • the respective bumps of different diameters 340 is at least for the bumps shown on the left side in the FIGS. 5 and 6 a corresponding sequence of application of the individual induction coils 50 of the array 5 shown so that the respective bulges can be acted upon with heating energy and correspondingly in the subsequent cooling process by thermal contraction the bumps 340 are pulled out of the belt 3.
  • the individual inductors 50 may be provided either as air coils or as coils with a sintered ferrite core. In this way, the coils with the very high frequencies during selective, rapid switching on and off of the respective current, for example, by the single current pulse or the current pulse burst to follow.
  • the respective sequences for controlling the individual induction coils 50 of the heating device 5 result from the energy to be introduced into the conveyor belt 3. Accordingly, for example, the same position of the conveyor belt 3 with two or more induction coils can be acted upon in succession with a larger deformation and a higher energy requirement.
  • FIGS. 5 and 6 To illustrate this are in the FIGS. 5 and 6 in individual induction coils 50 of the heater 5 numbers entered (1 to 7 in FIG. 5 and 1 to 14 in FIG. 6 ), which indicate the time sequence of the respective individual control of the individual induction coils 50.
  • FIG. 7 shows a further schematic side view of a strip casting 1 for casting a flat metal strip 2 in a further alternative embodiment.
  • a supply system 20 is provided for charging the conveyor belt 3 with the molten metal to form the flat metal strip 2.
  • a spray water cooling box 36 which also provides a negative pressure, is provided below the conveyor belt 3.
  • the conveyor belt 3 is guided in the free area 310 via two pairs of S rollers 70, 72, which allow the area 700 of the conveyor belt 3 located between the two S roller pairs to be subjected to a different tension than the one present in the casting area 300 Train of the conveyor belt 3.
  • a lesser train can be adjusted, for example, to be able to detect small deviations and slight deformations of the conveyor belt 3 via the measuring device 4 ,
  • a higher tension is set in the area 700 of the conveyor belt 3 lying between the two S-rollers 70, 72 than in the casting area 300, in order to extract deformations in the area 700 located between the two S-rollers 70, 72 to support from the conveyor belt 3 by the higher strip tension.
  • FIG. 8 shows the strip casting 1 from FIG. 7 in a further state, in which the two pairs of S-rollers 70, 72 are arranged in a loading position, that is correspondingly in a relation to the in FIG. 7 shown position are rotated against each other to facilitate the onset of a new conveyor belt 3.
  • the tension roller 34 compensates for the corresponding difference in length of the conveyor belt 3.
  • Both the heating device 5 and the measuring device 4 are so far out of the way or moved that the conveyor belt 3 can be used in the corresponding guides.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Description

Technisches GebietTechnical area

Die vorliegende Erfindung betrifft ein Verfahren zum Betrieb eines Transportbandes einer Bandgießanlage, sowie eine Bandgießanlage zum Gießen von Metallen.The present invention relates to a method for operating a conveyor belt of a strip casting plant, and a strip casting plant for casting metals.

Stand der TechnikState of the art

Die Verwendung eines Bandgießverfahrens für das Vergießen von Metallen als flache, endabmessungsnahe Bänder ist bekannt. Hierbei wird die entsprechende Metallschmelze typischerweise zwischen zwei von unten und/oder von oben auf der der Metallschmelze abgewendeten Seite gekühlten Transportbändern, welche als wandernde Kokille dienen, gegossen, wobei durch die Anwendung der Transportbänder entsprechend direkt ein endabmessungsnahes Gießen des jeweiligen flachen Metallbandes erreicht werden kann.The use of a strip casting method for casting metals as flat, near-net-shape tapes is known. In this case, the corresponding molten metal is typically poured between two conveyor belts which are cooled from below and / or from above on the side facing away from the molten metal and which serve as a traveling mold, it being possible to directly achieve near-net-shape casting of the respective flat metal strip by the use of the conveyor belts ,

Ein solches Verfahren sowie eine entsprechende Stranggießvorrichtung ist beispielsweise aus der EP 326 788 A1 bekannt, gemäß welcher die beiden Transportbänder beziehungsweise Kokillenbänder von einem Bund abgewickelt werden und nach der Verwendung wieder auf einem Bund aufgewickelt werden. Das Band wird beim Durchlaufen der Gießkammer dabei gereckt, um wärmebedingten Deformationen des Kokillenbandes entgegen zu wirken.Such a method and a corresponding continuous casting is, for example, from the EP 326 788 A1 known, according to which the two conveyor belts or mold belts are handled by a federal government and are wound after use again on a bunch. The band is stretched while passing through the casting chamber to counteract thermally induced deformations of the mold belt.

Bei dem Bandgießverfahren kommt es typischerweise zu einer Verformung des Transportbandes, welche sich unter anderem dadurch ergibt, dass beim Aufbringen des flüssigen Metalls auf das jeweilige Transportband bei gleichzeitiger hoher Kühlleistung das flüssige Metall in einen Flatterkontakt mit dem
Transportband tritt. Flatterkontakt meint hierbei, dass das flüssige Metallband bei Kontakt mit dem stark gekühlten Transportband schnell erstarrt und entsprechend eine erste Gießhaut zum Transportband hin ausbildet. Durch die thermische Kontraktion der Gießhaut, welche mit einem Ablösen der Gießhaut vom Transportband verbunden ist, verliert die Gießhaut die intensive Kühlung, welche durch den Direktkontakt mit dem gekühlten Transportband entsteht, wieder und schmilzt dann durch das hinter der Haut befindliche flüssige Metall sofort wieder auf. Es kommt entsprechend dann zum erneuten Kontakt zwischen dem flüssigen Metall und dem Transportband. Damit ergibt sich hier ein Flatterkontakt zwischen dem Metall und dem gekühlten Transportband, bis die gebildete Gießhaut so stabil ist, dass sie nicht wieder aufschmilzt, sondern durch ihr Eigengewicht beziehungsweise den metallostatischen Druck aus dem noch flüssigen Metallkern am Transportband angelegt bleibt.The strip casting process typically leads to a deformation of the conveyor belt, which results inter alia from the fact that, when the liquid metal is applied to the respective conveyor belt while the cooling capacity is high, the liquid metal is in flutter contact with the conveyor belt
Conveyor belt occurs. Flutter contact means here that the liquid metal strip rapidly solidifies on contact with the strongly cooled conveyor belt and accordingly forms a first casting skin towards the conveyor belt. Due to the thermal contraction of the casting skin, which is associated with a detachment of the casting skin from the conveyor belt, the casting skin loses the intense cooling, which is caused by the direct contact with the cooled conveyor belt, and then melts again by the liquid metal located behind the skin immediately , It comes accordingly to re-contact between the liquid metal and the conveyor belt. This results in a flutter contact between the metal and the cooled conveyor belt until the formed casting skin is so stable that it does not melt again, but remains created by its own weight or metallostatic pressure from the still liquid metal core on the conveyor belt.

Unter anderem bei diesem Prozess kommt es zu einem Ausbeulen des Transportbandes und entsprechend einer thermischen Beulenbildung in dem Transportband, welche unter anderem daher rührt, dass sich in unterschiedlichen Bereichen des Transportbandes quer zur Transportrichtung unterschiedliche Temperaturen aufgrund des unterschiedlich flatternden flüssigen Metallmaterials ausbilden.Among other things, in this process, there is a buckling of the conveyor belt and corresponding to a thermal buckling in the conveyor belt, which, among other reasons, that develop different temperatures in different areas of the conveyor belt transversely to the transport direction due to the different fluttering liquid metal material.

Hierbei kann es zu permanenter Beulenbildung im Transportband kommen, welche bei einem nachfolgenden Gießprozess zu einer Verschlechterung der Erstarrungsbedingungen des gegossenen Metallbandes führen kann.This can lead to permanent bulging in the conveyor belt, which can lead to a deterioration in the solidification conditions of the cast metal strip in a subsequent casting process.

Dies ist besonders problematisch bei der Verwendung eines kontinuierlichen Gießverfahrens, bei welchem ein umlaufendes Transportband verwendet wird, so wie es beispielsweise in der EP 0 295 080 B1 beschrieben ist. Gemäß dieser Schrift wird eine Doppelbandgießmaschine und ein Verfahren zum Gießen bei der Anwendung derselben angegeben, bei welchem unterschiedliche Bereiche des umlaufenden Transportbandes unterschiedlich mit Wärmeenergie beaufschlagt
werden, um einer Verformung des Transportbandes entgegenzuwirken. Insbesondere wird hier bei unterschiedlichen Gießbreiten jeweils der Rand des Transportbandes kontinuierlich erhitzt, um einer thermisch bedingten Verformung des Transportbandes aufgrund der unterschiedlich eingetragenen thermischen Energien im Bereich des flüssigen Metalls sowie in den Randbereichen des Transportbandes entgegenzuwirken. Diese Erwärmung findet vor dem eigentlichen Gießvorgang statt.This is particularly problematic in the use of a continuous casting process, in which a circulating conveyor belt is used, as for example in the EP 0 295 080 B1 is described. According to this document, a double-belt casting machine and a method for casting in the application of the same is stated, in which different regions of the circulating conveyor belt act differently on thermal energy
be counteracted to a deformation of the conveyor belt. In particular, the edge of the conveyor belt is continuously heated here at different casting widths to counteract a thermally induced deformation of the conveyor belt due to the different registered thermal energy in the liquid metal and in the edge regions of the conveyor belt. This heating takes place before the actual casting process.

Auch aus der DE 41 36 542 A1 ist ein Verfahren bekannt, bei welchem ein umlaufendes Transportband vor dem Beaufschlagen mit der metallischen Schmelze erwärmt wird, um einer Verformung des Transportbandes entgegenzuwirken.Also from the DE 41 36 542 A1 a method is known in which a circulating conveyor belt is heated prior to the application of the metallic melt in order to counteract a deformation of the conveyor belt.

Aus der US 3,937,270 ist ein Verfahren zum kontinuierlichen Gießen bekannt, bei welchem die Temperatur der Gießbänder gesteuert wird.From the US 3,937,270 For example, a continuous casting method is known in which the temperature of the casting belts is controlled.

Die vorgeschlagenen Verfahren beziehungsweise Vorrichtungen dienen entsprechend dazu, ein Transportband vor dem Gießvorgang beziehungsweise während des Gießvorganges so gezielt zu erwärmen, dass einer Verformung des Transportbandes entgegen gewirkt wird.The proposed method or devices are used accordingly to heat a conveyor belt before the casting process or during the casting so targeted that a deformation of the conveyor belt is counteracted.

Darstellung der ErfindungPresentation of the invention

Ausgehend von dem bekannten Stand der Technik ist es daher eine Aufgabe der vorliegenden Erfindung, ein Verfahren sowie eine Vorrichtung anzugeben, mittels welcher Verformungen in einem Transportband reduziert werden können.Starting from the known prior art, it is therefore an object of the present invention to provide a method and a device by means of which deformations in a conveyor belt can be reduced.

Diese Aufgabe wird durch das Verfahren zum Betrieb eines Transportbandes einer Bandgießanlage mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved by the method for operating a conveyor belt of a strip casting with the features of claim 1.

Aus der US 3,937,270 ist ein Verfahren zum kontinuierlichen Gießen bekannt, bei welchem die Temperatur der Gießbänder gesteuert wird.From the US 3,937,270 For example, a continuous casting method is known in which the temperature of the casting belts is controlled.

Entsprechend umfasst das Verfahren zum Betrieb eines Transportbandes einer Bandgießanlage die Schritte des Durchführens einer Profilmessung des Transportbandes, um die Position und die Ausdehnung von Verformungen des Transportbandes zu detektieren, und der selektiven Erwärmung der jeweiligen detektierten Verformung in Abhängigkeit der Ausdehnung der Verformung, um die Verformung durch nachfolgende thermische Kontraktion zu verringern und/oder zu eliminieren.Accordingly, the method of operating a conveyor belt of a strip caster includes the steps of performing a profile measurement of the conveyor belt to detect the position and extent of deformations of the conveyor belt, and selectively heating the respective detected deformation depending on the extent of deformation, deformation reduce and / or eliminate by subsequent thermal contraction.

Durch die Durchführung der Profilmessung des Transportbandes und die entsprechende Detektion der Position und Ausdehnung von Verformungen können entsprechend die sich im Transportband nach einem Gießprozess befindlichen Beulen, welche durch ein Fließen des Materials des Transportbandes entstanden sind, detektiert werden und deren Relativposition zum Transportband sowie deren Ausdehnung erfasst werden. Durch den nachfolgenden Schritt des selektiven Erwärmens der jeweiligen Verformungen, also insbesondere der detektierten Beulen, kann dann die jeweilige Verformung durch die entsprechende nachfolgende thermische Kontraktion während des Abkühlens der vorher stark erwärmten selektiven Bereiche des Transportbandes verringert werden beziehungsweise vollständig aus dem Band heraus gezogen werden.By carrying out the profile measurement of the conveyor belt and the corresponding detection of the position and extent of deformations can be correspondingly located in the conveyor belt after a casting dents, which are caused by a flow of the material of the conveyor belt, detected and their relative position to the conveyor belt and their extent be recorded. As a result of the subsequent step of selectively heating the respective deformations, that is to say in particular the detected bumps, the respective deformation can then be reduced by the corresponding subsequent thermal contraction during the cooling of the previously strongly heated selective regions of the conveyor belt or pulled completely out of the belt.

Durch die selektive Erwärmung des Transportbandes im Bereich der detektierten Verformungen kann entsprechend ein Richten des Transportbandes durch die nachfolgende thermische Kontraktion des Materials des Transportbandes erreicht werden. Dies ist auch während des laufenden Gießbetriebes möglich, wobei die Profilmessung dann an einem freien Bereich des Transportbandes durchgeführt wird und die selektive Erwärmung des Transportbandes ebenfalls in einem freien Bereich des Transportbandes durchgeführt wird.Due to the selective heating of the conveyor belt in the region of the detected deformations can be achieved in accordance with a straightening of the conveyor belt by the subsequent thermal contraction of the material of the conveyor belt. This is also possible during the ongoing casting operation, wherein the profile measurement is then performed on a free area of the conveyor belt and the selective heating of the conveyor belt is also carried out in a free area of the conveyor belt.

Die Profilmessung wird dabei vorteilhaft in einem Abstandsverfahren durchgeführt, wobei hier detektiert werden kann, ob Beulen im Transportband vorliegen und an welcher Position des Transportbandes diese Beulen mit welcher Ausdehnung vorliegen. Die Profilmessung kann auch mit zwei gegenüberliegenden Abstandsmessungen mittels einer Differenzmethode festgestellt werden, oder es kann mittels einem Laserscanvorgang oder über Messvorhänge mit einer gewissen Breite eine entsprechende Profilmessung durchgeführt werden. Andere berührungslose Abstandsmessverfahren, wie zum Beispiel über Radar oder Ultraschall, können zur Profilmessung ebenfalls verwendet werden. Entsprechend wird auf diese Weise, gekoppelt mit der jeweiligen Bandposition, die Ausdehnung sowie die Position von Verformungen und insbesondere von Beulen im Transportband ermittelt.The profile measurement is advantageously carried out in a distance method, in which case it can be detected whether bulges present in the conveyor belt and on Which position of the conveyor belt these bumps are present with which extent. The profile measurement can also be determined with two opposing distance measurements by means of a differential method, or it can be carried out by means of a laser scanning or measuring curtains with a certain width a corresponding profile measurement. Other non-contact distance measuring methods, such as radar or ultrasound, may also be used for profile measurement. Accordingly, in this way, coupled with the respective tape position, the extent and the position of deformations and in particular of bumps in the conveyor belt determined.

Unter Beule wird hier eine Verformung verstanden, welche sich aus einer umgebenden, im Wesentlichen planen Oberfläche heraushebt. Eine Beule ist insbesondere keine Verwindung des Transportbandes.By bulge is meant here a deformation which stands out from a surrounding, substantially flat surface. A bump is in particular no distortion of the conveyor belt.

Bei dem Messvorgang können insbesondere Rechenverfahren bi-kubischer Splines zur Ermittlung von Position, Tiefe sowie Ausdehnung der jeweiligen Verformungen und insbesondere der Beulen zum Einsatz kommen.In particular, calculation methods of bi-cubic splines for determining the position, depth and extent of the respective deformations and in particular the bumps can be used in the measuring process.

Die selektive Erwärmung der detektierten Verformungen wird bevorzugt über eine selektive Beaufschlagung des Transportbandes mit einem Magnetfeld über Induktionsspulen durchgeführt, wobei die im Transportband entstehenden Wirbelströme entsprechend für eine selektive Erwärmung des Transportbandes sorgen. Auf diese Weise können über die nachfolgend entstehende thermische Kontraktion die jeweiligen Verformungen im Transportband reduziert oder vollständig aus diesem herausgezogen werden.The selective heating of the detected deformations is preferably carried out via a selective loading of the conveyor belt with a magnetic field via induction coils, wherein the eddy currents produced in the conveyor belt correspondingly ensure a selective heating of the conveyor belt. In this way, the respective deformations in the conveyor belt can be reduced or completely pulled out of the subsequent thermal contraction.

Die Induktion wird bevorzugt über ein Array von Induktionsspulen auf das Transportband aufgebracht, welches in einem freien Bereich des Transportbandes angeordnet ist. Durch ein entsprechendes Zu- und Abschalten unterschiedlicher Kombinationen von Spulen können entsprechend bestimmte Bereiche des
Transportbandes sowohl in Querrichtung als auch in Transportrichtung des Transportbandes selektiv stark erwärmt werden, so dass die Beulen entsprechend aus dem Transportband entfernt werden können.The induction is preferably applied via an array of induction coils on the conveyor belt, which is arranged in a free region of the conveyor belt. By a corresponding switching on and off of different combinations of coils can correspondingly certain areas of the
Conveyor belt are selectively strongly heated both in the transverse direction and in the transport direction of the conveyor belt, so that the bumps can be removed accordingly from the conveyor belt.

Das Array der Induktionsspulen wird dabei bevorzugt so angesteuert, dass genau diejenigen Bereiche des Transportbandes selektiv erwärmt werden, in welchen die Verformung detektiert wurde. Dies ist unabhängig davon, ob es sich um kreisrunde Beulen oder um langgestreckte Beulen handelt. Auch langgestreckte Beulen, welche sich nicht in Bandlaufrichtung erstrecken, können über eine entsprechende Ansteuerung des Spulenarrays gezielt und selektiv erwärmt werden.In this case, the array of induction coils is preferably controlled such that precisely those regions of the conveyor belt in which the deformation was detected are selectively heated. This is independent of whether it is circular bumps or elongated bumps. Elongated bulges, which do not extend in the strip running direction, can also be selectively and selectively heated via a corresponding control of the coil array.

Bevorzugt wird durch eine zeitliche Abfolge mindestens zweier Spannungspulse oder Stromimpulsbursts und/oder einer zeitlichen Abfolge der Ansteuerung mindestens zweier unterschiedlicher Induktionsspulen eine selektive Erwärmung aufgebracht. Die zeitliche Abfolge der Spannungspulse, Stromimpulsbursts oder der Ansteuerung der unterschiedlichen Induktionsspulen wird auf Grundlage der ermittelten Beulenform, bevorzugt der über die bi-kubischen Splines ermittelten Beulenform, derart bestimmt, dass eine gezielte Erwärmung des Transportbandes in dem Bereich der ermittelten Beule stattfindet.Preferably, a selective heating is applied by a chronological sequence of at least two voltage pulses or current pulse bursts and / or a temporal sequence of the control of at least two different induction coils. The time sequence of the voltage pulses, current pulse bursts or the activation of the different induction coils is determined on the basis of the determined bulge shape, preferably the bump shape determined via the bi-cubic splines, such that a targeted heating of the transport belt takes place in the region of the determined bulge.

Bevorzugt wird das selektive Erwärmen des Transportbandes und gegebenenfalls auch die Profilmessung in einem Bereich des Transportbandes durchgeführt, welcher gegenüber dem Gießbereich einen höheren Bandzug oder einen geringeren Bandzug aufweist. Hier kann beispielsweise durch das Aufbringen eines erhöhten Bandzuges das Herausziehen von Beulen positiv beeinflusst werden oder mittels eines geringeren Bandzuges auch kleinere Beulen detektiert werden.Preferably, the selective heating of the conveyor belt and possibly also the profile measurement is carried out in a region of the conveyor belt which has a higher strip tension or a smaller strip tension in relation to the casting area. Here, for example, by applying an increased strip tension, the pulling out of bumps can be positively influenced or even smaller bumps can be detected by means of a smaller strip tension.

Die oben beschriebene Aufgabe wird weiterhin durch eine Bandgießanlage zum Gießen von flachen Metallbändern mit den Merkmalen des Anspruchs 10 gelöst.The above-described object is further achieved by a strip casting machine for casting flat metal strips having the features of claim 10.

Entsprechend ist eine Bandgießanlage zum Gießen von flachen Metallbändern mit mindestens einem umlaufenden Transportband vorgesehen, wobei mindestens eine Messvorrichtung zur Profilmessung des Transportbandes vorgesehen ist, um die Position und Ausdehnung von Verformungen des Transportbandes zu detektieren, und mindestens eine Heizvorrichtung zur selektiven Erwärmung der jeweiligen detektierten Verformung in Abhängigkeit der Ausdehnung der Verformung vorgesehen ist.Accordingly, a strip casting plant is provided for casting flat metal strips with at least one circulating conveyor belt, wherein at least one measuring device for profile measurement of the conveyor belt is provided to detect the position and extent of deformations of the conveyor belt, and at least one heating device for selectively heating the respective detected deformation is provided depending on the extent of the deformation.

Wie bereits oben zum Verfahren beschrieben, ermöglicht die Messvorrichtung eine Profilmessung des Transportbandes derart, dass Verformungen detektiert werden können, beispielsweise zur Detektion von Beulen im Transportband, welche von einem vorherigen Gießvorgang herrühren. Die Messvorrichtung ermöglicht es dabei, die Bandposition, also die Position der jeweiligen Verformung auf dem Transportband, sowie die Ausdehnung der jeweiligen Verformung, beispielsweise den Durchmesser beziehungsweise die Form einer Beule, sowie deren Tiefe zu bestimmen.As already described above for the method, the measuring device allows a profile measurement of the conveyor belt such that deformations can be detected, for example for the detection of dents in the conveyor belt, which originate from a previous casting operation. The measuring device makes it possible to determine the tape position, ie the position of the respective deformation on the conveyor belt, as well as the extent of the respective deformation, for example the diameter or the shape of a bulge, and their depth.

Über die Heizvorrichtung kann dann der Bereich, in welchem die jeweilige Verformung im Transportband detektiert wurde, selektiv erwärmt werden. Die selektive Erwärmung wird dabei bevorzugt über eine entsprechende Steuervorrichtung so gesteuert, dass über eine thermische Kontraktion die jeweilige Verformung beim auf die Erwärmung folgenden Abkühlvorgang aus dem Transportband herausgezogen wird. Entsprechend kann die eingebrachte Wärmeenergie beziehungsweise die im Transportband zu erreichende Temperatur der Erwärmung beispielsweise auch abhängig von der Ausdehnung der jeweiligen Verformung beziehungsweise der Tiefe der jeweiligen Verformung gesteuert werden, derart, dass ein möglichst genaues und effektives Verringern beziehungsweise Entfernen der jeweiligen Verformung aus dem Transportband ermöglicht wird. Dies ist natürlich auch in dem oben beschriebenen Verfahren möglich. Auf diese Weise kann erreicht werden, dass das Transportband vor
darauffolgenden Gießvorgang wieder eine vollständig plane Oberfläche bereitstellt, auf welche dann die metallische Schmelze aufgegeben werden kann.Via the heating device, the region in which the respective deformation was detected in the conveyor belt can then be selectively heated. The selective heating is preferably controlled via a corresponding control device so that the respective deformation is pulled out of the conveyor belt by means of a thermal contraction during the cooling process following the heating. Accordingly, the introduced heat energy or the temperature of the heating to be achieved in the conveyor belt, for example, also be controlled depending on the extent of the respective deformation or the depth of the respective deformation, such that the most accurate and effective reduction or removal of the respective deformation of the conveyor belt allows becomes. Of course, this is also possible in the method described above. In this way it can be achieved that the conveyor belt before
subsequent casting process again provides a completely flat surface to which then the metallic melt can be abandoned.

Es ist bevorzugt, die Messvorrichtung über ein Abstandsmessverfahren durchzuführen und entsprechend die Messvorrichtung so auszubilden, dass die
mit der notwendigen Energie versorgt werden, um entsprechende Stromimpulse beziehungsweise Strombursts auf die jeweilig anzusteuernden Induktionsspulen abgeben zu können.It is preferred to carry out the measuring device via a distance measuring method and to design the measuring device accordingly such that the
be supplied with the necessary energy to be able to deliver corresponding current pulses or current bursts to the respective induction coils to be controlled.

Die Induktionsspulen können in einer bevorzugten Anordnung Durchmesser zwischen 10 und 30 cm aufweisen und entsprechend nebeneinander in zueinander leicht versetzten Zeilen über die gesamte Breite des Transportbandes hinweg angeordnet sein.In a preferred arrangement, the induction coils may have diameters between 10 and 30 cm and be arranged correspondingly next to each other in rows slightly offset from one another over the entire width of the conveyor belt.

In einer weiteren bevorzugten Ausgestaltung ist ein Satz von Spannvorrichtungen, bevorzugt zwei S-Rollen, vorgesehen, mittels welchen ein zwischen diesen beiden Spannvorrichtungen liegender Abschnitt des Transportbandes entweder mit einem höheren Zug, als dem im Gießbereich aufgebrachten Zug, oder mit einem geringeren Zug, als dem im Gießbereich aufgebrachten Zug, beaufschlagt werden kann. In dem zwischen den beiden Spannvorrichtungen befindlichen Bereich ist bevorzugt die Heizvorrichtung und besonders bevorzugt auch die Messvorrichtung angeordnet, um das Transportband auch bei unterschiedlichen Zügen bezüglich seines Profils messen zu können und mit Heizenergie selektiv beaufschlagen zu können. Zum Herausziehen von Beulen aus dem Transportband ist eine hohe Zugspannung förderlich. Zur Messung von auch kleinen Beulen im Transportband ist eine geringe Zugspannung förderlich. Entsprechend kann über die Einstellung der jeweiligen S-Rollen in dem zwischen den S-Rollen angeordneten Bereich ein entsprechendes Zugregime eingestellt werden.In a further preferred refinement, a set of tensioning devices, preferably two S-rollers, are provided, by means of which a section of the conveyor belt lying between these two tensioning devices either with a higher tension than the tension applied in the casting area or with a lower tension than the applied in the casting area train can be acted upon. In the area located between the two tensioning devices, the heating device and particularly preferably also the measuring device is preferably arranged in order to be able to measure the conveyor belt with respect to its profile, even with different tractions, and to be able to apply heat energy selectively. To pull out bumps from the conveyor belt high tension is conducive. To measure even small bumps in the conveyor belt low tension is conducive. According to the setting of the respective S-rollers in the arranged between the S-rollers area a corresponding Zugregime can be adjusted.

Kurze Beschreibung der FigurenBrief description of the figures

Bevorzugte weitere Ausführungsformen und Aspekte der vorliegenden Erfindung werden durch die nachfolgende Beschreibung der Figur näher erläutert. Dabei zeigen

Figur 1
eine schematische Seitenansicht eines Abschnitts einer Bandgießanlage gemäß einem ersten Ausführungsbeispiel;
Figur 2
eine schematische Seitenansicht eines Ausschnittes einer Bandgießanlage gemäß einem zweiten Ausführungsbeispiel;
Figur 3
eine schematische Schaltungsanordnung für eine Heizvorrichtung;
Figur 4
eine schematische Anordnung für eine Schaltung einer Heizvorrichtung in einem weiteren Ausführungsbeispiel;
Figur 5
eine schematische Draufsicht auf ein Induktionsspulenarray in einem ersten Zustand;
Figur 6
eine weitere schematische Draufsicht auf ein Induktionsspulenarray in einem zweiten Zustand;
Figur 7
eine schematische Seitenansicht eines Abschnittes einer Bandgießanlage in einer weiteren Ausführungsform; und
Figur 8
eine weitere schematische Seitenansicht des in Figur 7 gezeigten Ausschnittes der Bandgießanlage in einem Ladezustand.
Preferred further embodiments and aspects of the present invention will be explained in more detail by the following description of the figure. Show
FIG. 1
a schematic side view of a portion of a strip casting plant according to a first embodiment;
FIG. 2
a schematic side view of a section of a strip casting according to a second embodiment;
FIG. 3
a schematic circuit arrangement for a heating device;
FIG. 4
a schematic arrangement for a circuit of a heating device in a further embodiment;
FIG. 5
a schematic plan view of an induction coil array in a first state;
FIG. 6
a further schematic plan view of an induction coil array in a second state;
FIG. 7
a schematic side view of a portion of a strip casting in a further embodiment; and
FIG. 8
another schematic side view of the in FIG. 7 shown section of the strip casting in a state of charge.

Detaillierte Beschreibung bevorzugter AusführungsbeispieleDetailed description of preferred embodiments

Im Folgenden werden bevorzugte Ausführungsbeispiele anhand der Figuren beschrieben. Dabei werden gleiche, ähnliche oder gleichwirkende Elemente in den unterschiedlichen Figuren mit identischen Bezugszeichen bezeichnet und auf eine wiederholte Beschreibung dieser Elemente wird in der nachfolgenden Beschreibung teilweise verzichtet, um Redundanzen zu vermeiden.In the following, preferred embodiments will be described with reference to the figures. In this case, identical, similar or equivalent elements in the different figures are denoted by identical reference numerals and a repeated description of these elements will be omitted in the following description in part in order to avoid redundancies.

Figur 1 zeigt in einer schematischen Seitenansicht einen Abschnitt einer Bandgießanlage 1 zum Gießen eines flachen Metallbandes 2, wobei ein Zuführsystem 20 vorgesehen ist, über welches die Metallschmelze auf ein Transportband 3 aufgebracht wird. Das Transportband 3 ist ein umlaufendes, also endloses Transportband, welches über zwei obere Rollen 30, 32 sowie eine Spannrolle 34 umlaufend geführt ist. FIG. 1 shows a schematic side view of a portion of a strip casting plant 1 for casting a flat metal strip 2, wherein a feed system 20 is provided, via which the molten metal is applied to a conveyor belt 3. The conveyor belt 3 is a circulating, that is endless conveyor belt, which is circumferentially guided over two upper rollers 30, 32 and a tension roller 34.

In einem Gießbereich 300 wird die Metallschmelze über das Zuführsystem 20 auf das Transportband 3 aufgegeben, um das flache Metallband 2 auszubilden.In a pouring region 300, the molten metal is fed via the feeding system 20 onto the conveyor belt 3 to form the flat metal strip 2.

Unterhalb eines weiten Bereiches des Gießbereiches 300 ist ein Spritzwasserkühlkasten 36 vorgesehen, welcher das Transportband 3 von unten durch eine entsprechende Wasserzufuhr effektiv kühlt. Hierbei werden beispielsweise Kühlleistungen von etwa 7 bis 8 MW/m2 im Bereich, in welchem die Metallschmelze über das Zuführsystem 20 auf das Transportband 3 aufgegeben wird, erreicht.Below a wide region of the casting region 300, a spray water cooling box 36 is provided, which effectively cools the conveyor belt 3 from below by means of a corresponding water supply. In this case, for example, cooling capacities of about 7 to 8 MW / m 2 are achieved in the region in which the molten metal is fed to the conveyor belt 3 via the feed system 20.

Der Spritzwasserkühlkasten 36 stellt weiterhin einen Unterdruck bereit, mittels welchem das Transportband 3 weitgehend plan geführt werden kann, um eine plane Auflagefläche für die Metallschmelze bereitzustellen.The spray water cooling box 36 further provides a negative pressure, by means of which the conveyor belt 3 can be guided largely flat to provide a flat support surface for the molten metal.

Dennoch ergeben sich, beispielsweise durch den oben beschriebenen Flattereffekt, lokale Verformungen des Transportbandes 3, welche insbesondere als Beulen des Transportbandes auftreten.Nevertheless, resulting, for example, by the flutter effect described above, local deformations of the conveyor belt 3, which occur in particular as bumps of the conveyor belt.

In einem freien Bereich 310 des Transportbandes 3 ist zur Bestimmung dieser Verformungen eine Messvorrichtung 4 vorgesehen, mittels welcher die Position der jeweiligen Verformung sowie deren Ausdehnung detektiert werden können. Die jeweilige Position der jeweiligen Verformung auf dem Transportband 3, sowie deren Ausdehnung, also beispielsweise deren Durchmesser, deren Längserstreckung und/oder deren Tiefe beziehungsweise Höhe, werden über die Messvorrichtung 4 an eine zentrale, nicht gezeigte Auswertungs- und Steuervorrichtung übergeben.In a free region 310 of the conveyor belt 3, a measuring device 4 is provided for determining these deformations, by means of which the position of the respective deformation and its extent can be detected. The respective position of the respective deformation on the conveyor belt 3, as well as their extent, that is, for example, the diameter, the longitudinal extent and / or the depth or height, are on the Passing measuring device 4 to a central, not shown evaluation and control device.

Die Messvorrichtung 4 kann eine berührungslose Messvorrichtung sein, beispielsweise über einen mäanderförmigen Scanvorgang mittels eines Lasers, durch Messvorhänge über die Breite des Transportbandes 3 hinweg, durch Radar oder Ultraschall oder über bildgebende Verfahren.The measuring device 4 can be a non-contact measuring device, for example via a meander-shaped scanning process by means of a laser, through measuring curtains across the width of the conveyor belt 3, through radar or ultrasound or via imaging methods.

Aus dem mit der Messvorrichtung 4 detektierten Profil des Transportbandes 3 wird ein entsprechendes Muster zur Ansteuerung einer Heizvorrichtung 5 ermittelt, wobei die Heizvorrichtung 5 dann entsprechend dem ermittelten Muster selektiv Heizenergie auf das Transportband 3 aufbringt. Die Heizvorrichtung 5 besteht bevorzugt aus einem Array von Induktionsspulen, welche die Heizenergie in genau den Bereichen auf das Transportband 3 aufbringt, in welchen die Messvorrichtung 4 vorher die entsprechenden Verformungen detektiert hat. Entsprechend ist die Messvorrichtung 4 in Bandlaufrichtung betrachtet vor der Heizvorrichtung 5 angeordnet.From the detected with the measuring device 4 profile of the conveyor belt 3, a corresponding pattern for controlling a heater 5 is determined, the heater 5 then selectively applies heating energy according to the determined pattern on the conveyor belt 3. The heating device 5 preferably consists of an array of induction coils, which applies the heating energy in exactly the areas on the conveyor belt 3, in which the measuring device 4 has previously detected the corresponding deformations. Accordingly, the measuring device 4, viewed in the direction of tape travel, is arranged in front of the heating device 5.

Eine mögliche Ausbildung der Heizvorrichtung 5 wird nachfolgend beispielsweise unter Bezugnahme auf die Figuren 3 bis 6 beschrieben.One possible embodiment of the heating device 5 will be described below with reference to FIGS FIGS. 3 to 6 described.

Durch das selektive Aufbringen von Heizenergie auf das Transportband 3 genau in den Bereichen, in welchen über die Messvorrichtung 4 Verformungen festgestellt wurden, ermöglicht es, die jeweiligen Verformungen punktuell stark zu erhitzen und beim nachfolgenden Abkühlungsprozess durch eine thermische Kontraktion die entsprechenden Verformungen zu verringern oder gar vollständig im Transportband 3 zu eliminieren. Entsprechend kann beim erneuten Eintritt des Transportbandabschnittes in den Gießbereich 300 erreicht werden, dass das Transportband 3 hier wieder im Wesentlichen plan ist, um die Qualität des gegossenen Metallbandes 2 aufrechtzuerhalten.Due to the selective application of heating energy to the conveyor belt 3 precisely in the areas in which deformations were detected by the measuring device 4, it is possible to strongly heat the respective deformations selectively and even reduce the corresponding deformations during the subsequent cooling process by a thermal contraction completely eliminated in the conveyor belt 3. Correspondingly, when the conveyor belt section enters the casting area 300 again, it can be achieved that the conveyor belt 3 is substantially planar again in order to maintain the quality of the cast metal strip 2.

In Figur 2 ist eine Variante des in Figur 1 gezeigten Messverfahrens in der Bandgießanlage 1 gezeigt, wobei die Messvorrichtung 4 hier eine der ersten Messvorrichtung 40 gegenüberliegende zweite Messvorrichtung 42 aufweist, welche sowohl von der Oberseite als auch von der Unterseite aus das Transportband 3 bezüglich der jeweiligen Verformungen messen. Über eine Differenzmethode kann aus den jeweiligen Messdaten der oberen und unteren Messvorrichtung 40, 42 dann ein exakter Wert für die jeweilige Verformung und besonders für die jeweilige, im Transportband 3 vorhandene Beule berechnet werden. Die Bereitstellung des Differenzmessverfahrens über die auf gegenüberliegenden Seiten des Transportbandes 3 angeordneten Messvorrichtungen 40, 42 können Artefakte, welche beispielsweise durch Bandschwingungen auftreten, im Wesentlichen eliminiert werden, so dass lediglich die dem Band inhärenten Verformungen über diese Messvorrichtung gemessen werden können.In FIG. 2 is a variant of in FIG. 1 shown here, wherein the measuring device 4 here one of the first measuring device 40 opposite second measuring device 42 which measure both from the top and from the bottom of the conveyor belt 3 with respect to the respective deformations. Using a difference method, an exact value for the respective deformation and in particular for the respective bulge present in the conveyor belt 3 can then be calculated from the respective measured data of the upper and lower measuring device 40, 42. The provision of the differential measuring method via the measuring devices 40, 42 arranged on opposite sides of the conveyor belt 3 can substantially eliminate artifacts which occur, for example, due to belt vibrations, so that only the deformations inherent in the belt can be measured via this measuring device.

Die Induktionsspulen 5 beziehungsweise das Array der Induktionsspulen 5 wird dann wieder so gesteuert, dass an den Positionen, an welchen über die Messvorrichtung 40, 42 eine Verformung festgestellt wurde, entsprechend selektiv Wärmeenergie in das Transportband 3 eingebracht wird.The induction coils 5 and the array of induction coils 5 are then controlled again so that heat is selectively introduced into the conveyor belt 3 at the positions at which a deformation has been determined via the measuring device 40, 42.

Figur 3 zeigt eine schematische Schaltungsanordnung zum Ansteuern einer Induktionsspule aus dem Array 5 an Induktionsspulen. Eine einzelne Induktionsspule 50 wird dabei über einen Leistungsschalter 60, beispielsweise einen Inverter, mit einem entsprechenden Stromimpuls dann beaufschlagt, wenn eine selektive beziehungsweise lokale Erwärmung des Transportbandes 3 erreicht werden soll. FIG. 3 shows a schematic circuit arrangement for driving an induction coil from the array 5 of induction coils. A single induction coil 50 is then acted upon via a power switch 60, for example an inverter, with a corresponding current pulse when a selective or local heating of the conveyor belt 3 is to be achieved.

Da die Bereitstellung eines einzelnen Stromimpulses eine hohe Energiedichte fordert, ist dem Leistungsschalter 60 eine Kondensatorgruppe oder eine Standardbatterie 62 vorgeschaltet, welche zur Zwischenspeicherung beziehungsweise zur Pufferung des Strombedarfs der Induktionsspule 50 dient.Since the provision of a single current pulse requires a high energy density, the power switch 60 is preceded by a capacitor group or a standard battery 62, which serves for the intermediate storage or for buffering the current requirement of the induction coil 50.

Die Kondensatorgruppe beziehungsweise Standardbatterie 62 werden über eine entsprechende Konstantstromquelle 64 kontinuierlich geladen, wobei die Energie dann nur über den Leistungsschalter 60 abgerufen wird, wenn tatsächlich eine Deformation des Transportbandes 3 im Bereich der entsprechenden, mit dem Leistungsschalter 60 verbundenen Induktionsspule 50 detektiert wurde.The capacitor group or standard battery 62 are continuously charged via a corresponding constant current source 64, the energy is then retrieved only via the power switch 60, when in fact a deformation of the conveyor belt 3 in the region of the corresponding, connected to the circuit breaker 60 induction coil 50 has been detected.

Figur 4 zeigt in einer Alternative eine Schaltvorrichtung, welche der Induktionsspule 50 über den entsprechenden Leistungsschalter 60 nicht einen einzelnen Spannungspuls, so wie in Figur 3 gezeigt, sondern einen Stromimpulsburst zukommen lässt, um entsprechend eine sehr starke Erwärmung des Transportbandes in einem sehr kurzen Zeitabschnitt beziehungsweise einem sehr kleinen Raumbereich zu ermöglichen. FIG. 4 In an alternative, there is shown a switching device which does not apply a single voltage pulse to the induction coil 50 via the corresponding power switch 60, as in FIG FIG. 3 but a Stromimpulsburst can be shown to allow correspondingly a very strong heating of the conveyor belt in a very short period of time or a very small space area.

In den Figuren 5 und 6 ist schematisch das Transportband 3 gezeigt, welches Beulen unterschiedlicher Größe aufweist. Die Beulen sind mit dem Bezugszeichen 340 versehen. Weiterhin ergibt sich, dass die Beulen, beispielsweise so wie in Figur 6 gezeigt, auch langgestreckte Beulen sein können, welche sich in unterschiedliche Richtungen erstrecken.In the FIGS. 5 and 6 schematically, the conveyor belt 3 is shown, which has bumps of different sizes. The bumps are provided with the reference numeral 340. Furthermore, it follows that the bumps, for example, as in FIG. 6 can also be elongated bumps which extend in different directions.

Unter dem Transportband 3, welches die Beulen von dem vorhergehenden Gießvorgang aufweist, ist eine Heizvorrichtung 5 in Form eines Arrays unterschiedlicher Induktionsspulen 50 vorgesehen. Die Induktionsspulen sind, in Bandlaufrichtung gesehen, in Zeilen angeordnet, welche leicht gegeneinander versetzt sind. Insbesondere sind in den Figuren 5 und 6 vier Zeilen an Induktionsspulen 50 gezeigt, welche sich im Wesentlichen über die Gesamtbreite des Transportbandes 3 hinweg erstrecken, und welche jeweils um eine sechstel Spulenbreite gegeneinander verschoben sind. Auf diese Weise lässt sich mit dem Induktionsspulenarray jeder Punkt auf dem Transportband 3 selektiv und sehr gezielt mit Wärmeenergie beaufschlagen.Under the conveyor belt 3, which has the bulges from the previous casting process, a heating device 5 in the form of an array of different induction coils 50 is provided. The induction coils are, as seen in the tape running direction, arranged in rows, which are slightly offset from each other. In particular, in the FIGS. 5 and 6 shown four rows of induction coils 50, which extend substantially over the entire width of the conveyor belt 3 away, and which are each offset by a sixth of the coil width. In this way, with the induction coil array each point on the conveyor belt 3 selectively and very selectively apply thermal energy.

Zur Beaufschlagung der jeweiligen Beulen unterschiedlicher Durchmesser ist zumindest für die auf der linken Seite gezeigten Beulen 340 in den Figuren 5 und 6 eine entsprechende Sequenz an Beaufschlagung der individuellen Induktionsspulen 50 des Arrays 5 so gezeigt, dass die jeweiligen Beulen mit Heizenergie beaufschlagt werden können und entsprechend beim nachfolgenden Abkühlvorgang über thermische Kontraktion die Beulen 340 aus dem Band 3 herausgezogen werden.For applying the respective bumps of different diameters 340 is at least for the bumps shown on the left side in the FIGS. 5 and 6 a corresponding sequence of application of the individual induction coils 50 of the array 5 shown so that the respective bulges can be acted upon with heating energy and correspondingly in the subsequent cooling process by thermal contraction the bumps 340 are pulled out of the belt 3.

Die individuellen Induktionsspulen 50 können entweder als Luftspulen vorgesehen sein, oder aber als Spulen mit einem gesinterten Ferrit-Kern. Auf diese Weise können die Spulen mit den sehr hohen Frequenzen beim selektiven, schnellen Ein- und Ausschalten des jeweiligen Stromes, beispielsweise durch den Stromeinzelimpuls beziehungsweise den Stromimpulsburst folgen zu können.The individual inductors 50 may be provided either as air coils or as coils with a sintered ferrite core. In this way, the coils with the very high frequencies during selective, rapid switching on and off of the respective current, for example, by the single current pulse or the current pulse burst to follow.

Die jeweiligen Sequenzen zur Ansteuerung der individuellen Induktionsspulen 50 der Heizvorrichtung 5 ergeben sich aus der in das Transportband 3 einzutragenden Energie. Entsprechend kann bei einer größeren Verformung und einem höheren Energiebedarf beispielsweise die gleiche Position des Transportbandes 3 mit zwei oder mehr Induktionsspulen nacheinander beaufschlagt werden.The respective sequences for controlling the individual induction coils 50 of the heating device 5 result from the energy to be introduced into the conveyor belt 3. Accordingly, for example, the same position of the conveyor belt 3 with two or more induction coils can be acted upon in succession with a larger deformation and a higher energy requirement.

Um dies zu illustrieren sind in den Figuren 5 und 6 in einzelnen Induktionsspulen 50 der Heizvorrichtung 5 Ziffern eingetragen (1 bis 7 in Figur 5 und 1 bis 14 in Figur 6), welche die zeitliche Reihenfolge der jeweiligen individuellen Ansteuerung der individuellen Induktionsspulen 50 angeben.To illustrate this are in the FIGS. 5 and 6 in individual induction coils 50 of the heater 5 numbers entered (1 to 7 in FIG. 5 and 1 to 14 in FIG. 6 ), which indicate the time sequence of the respective individual control of the individual induction coils 50.

Beispielsweise würde es bei einer kleinen Beule 340, so wie sie in Figur 5 in der Mitte des Transportbandes 3 angedeutet ist, ausreichen, eine einzige Induktionsspule einmal anzusteuern. Bei größeren runden Beulen 340, so wie sie an den Rändern des Transportbandes 3 in Figur 5 gezeigt sind, ergibt sich bereits eine komplexere zeitliche Abfolge der anzusteuernden individuellen Induktionsspulen 50.For example, with a small bump 340, as in FIG. 5 is indicated in the middle of the conveyor belt 3, sufficient to control a single induction coil once. For larger round bumps 340, as they are at the edges of the conveyor belt 3 in FIG. 5 are shown already results a more complex chronological sequence of the individual induction coils 50 to be controlled.

Bei den in Figur 6 gezeigten langgestreckten Beulen 340 wird die Ansteuerung sehr komplex, um die entsprechende Wirkung zu entfalten.At the in FIG. 6 shown elongated bumps 340, the control is very complex to develop the appropriate effect.

Die Reihenfolge der Ansteuerung ergibt sich aus der Auswertung der gemessenen Beulenformen durch bi-kubische Splines derart, dass eine zielgerichtete Erwärmung des Transportbandes 3 im Bereich der ermittelten Beule stattfinden kann.
Figur 7 zeigt eine weitere schematische Seitenansicht einer Bandgießanlage 1 zum Gießen eines flachen Metallbandes 2 in einer weiteren, alternativen Ausführungsform. Wieder ist ein Zuführsystem 20 zur Beaufschlagung des Transportbandes 3 mit der Metallschmelze vorgesehen, um das flache Metallband 2 auszubilden. Unterhalb des Transportbandes 3 ist wiederum ein Spritzwasserkühlkasten 36, welcher ebenfalls auch einen Unterdruck bereitstellt, vorgesehen. Das Transportband 3 ist in dem freien Bereich 310 über zwei S-Rollenpaare 70, 72 geführt, welche es erlauben, den sich zwischen den beiden S-Rollenpaaren befindlichen Bereich 700 des Transportbandes 3 mit einem anderen Zug zu beaufschlagen, als den im Gießbereich 300 vorhandenen Zug des Transportbandes 3. Mit anderen Worten kann in dem zwischen den beiden S-Rollen 70, 72 liegenden Bereich 700 des Transportbandes 3 ein geringerer Zug eingestellt werden, beispielsweise um über die Messvorrichtung 4 auch kleine Abweichungen und geringfügige Verformungen des Transportbandes 3 erkennen zu können.The order of activation results from the evaluation of the measured bulge shapes by bi-cubic splines such that a targeted heating of the conveyor belt 3 can take place in the region of the determined bulge.
FIG. 7 shows a further schematic side view of a strip casting 1 for casting a flat metal strip 2 in a further alternative embodiment. Again, a supply system 20 is provided for charging the conveyor belt 3 with the molten metal to form the flat metal strip 2. Below the conveyor belt 3, in turn, a spray water cooling box 36, which also provides a negative pressure, is provided. The conveyor belt 3 is guided in the free area 310 via two pairs of S rollers 70, 72, which allow the area 700 of the conveyor belt 3 located between the two S roller pairs to be subjected to a different tension than the one present in the casting area 300 Train of the conveyor belt 3. In other words, in the lying between the two S-rollers 70, 72 region 700 of the conveyor belt 3, a lesser train can be adjusted, for example, to be able to detect small deviations and slight deformations of the conveyor belt 3 via the measuring device 4 ,

In einer Variante wird in dem zwischen den beiden S-Rollen 70, 72 liegenden Bereich 700 des Transportbandes 3 ein höherer Zug eingestellt, als im Gießbereich 300, um in dem zwischen den beiden S-Rollen 70, 72 liegenden Bereich 700 das Herausziehen von Verformungen aus dem Transportband 3 durch den höheren Bandzug zu unterstützen.In one variant, a higher tension is set in the area 700 of the conveyor belt 3 lying between the two S-rollers 70, 72 than in the casting area 300, in order to extract deformations in the area 700 located between the two S-rollers 70, 72 to support from the conveyor belt 3 by the higher strip tension.

Figur 8 zeigt die Bandgießanlage 1 aus Figur 7 in einem weiteren Zustand, in welchem die beiden S-Rollenpaare 70, 72 in einer Ladestellung angeordnet sind, also entsprechend in einer gegenüber der in Figur 7 gezeigten Stellung gegeneinander rotiert sind, um das Einsetzen eines neuen Transportbandes 3 zu erleichtern. Die Spannrolle 34 gleicht dabei den entsprechenden Längenunterschied des Transportbandes 3 aus. Sowohl die Heizvorrichtung 5 als auch die Messvorrichtung 4 sind soweit aus dem Weg geklappt beziehungsweise bewegt, dass das Transportband 3 in die entsprechenden Führungen eingesetzt werden kann. FIG. 8 shows the strip casting 1 from FIG. 7 in a further state, in which the two pairs of S-rollers 70, 72 are arranged in a loading position, that is correspondingly in a relation to the in FIG. 7 shown position are rotated against each other to facilitate the onset of a new conveyor belt 3. The tension roller 34 compensates for the corresponding difference in length of the conveyor belt 3. Both the heating device 5 and the measuring device 4 are so far out of the way or moved that the conveyor belt 3 can be used in the corresponding guides.

Soweit anwendbar, können alle einzelnen Merkmale, die in den einzelnen Ausführungsbeispielen dargestellt sind, miteinander kombiniert und/oder ausgetauscht werden, ohne den Bereich der Erfindung zu verlassen.Where applicable, all individual features illustrated in the individual embodiments may be combined and / or interchanged without departing from the scope of the invention.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Bandgießanlagestrip casting plant
22
Metallbandmetal band
2020
Zuführsystemfeed
33
Transportbandconveyor belt
3030
obere Rolleupper roll
3232
obere Rolleupper roll
3434
Spannrolleidler
3636
SpritzwasserkühlkastenSplash-cooling box
300300
Gießbereichcasting area
310310
freier Bereichfree area
340340
Beulebump
44
Messvorrichtungmeasuring device
4040
erste Messvorrichtungfirst measuring device
4242
zweite Messvorrichtungsecond measuring device
55
Heizvorrichtungheater
5050
Induktionsspuleinduction coil
6060
Leistungsschalterbreakers
6262
Batteriebattery
6464
KonstantstromquelleConstant current source
7070
Spannvorrichtungjig
7272
Spannvorrichtungjig
700700
Bereich anderen ZugsArea of other train

Claims (15)

  1. Method of operating a transport belt (3) of a belt casting plant (1), comprising the steps of:
    - carrying out a profile measurement of the transport belt (3) so as to detect the position and extent of deformations (340) of the transport belt (3); and
    - selectively heating the respectively detected deformation (340) in dependence on the extent of the deformation (340) so as to reduce and/or eliminate the deformation (340) through subsequent thermal contraction.
  2. Method according to claim 1, characterised in that the profile measurement and the selective heating are carried out during ongoing casting operation.
  3. Method according to claim 1 or 2, characterised in that the profile measurement and the selective heating are carried out at a circulating transport belt (3).
  4. Method according to any one of the preceding claims, characterised in that the position and/or extent of bulges (340) in the transport belt (3) is or are detected by means of the profile measurement.
  5. Method according to any one of the preceding claims, characterised in that the profile measurement is carried out by way of a distance measurement and/or a difference measurement, preferably by way of a laser scanning process, a laser measuring curtain, radar, ultrasound and/or image-generating methods.
  6. Method according to claim 5, characterised in that the detection of the deformations in the transport belt is carried out by way of computer processing of bi-cubic splines for determination of position, depth and extent of bulges.
  7. Method according to the preceding claim, characterised in that the selective heating of the transport belt (3) is carried by application of a voltage pulse or a current pulse burst to at least one induction coil (50) of a heating device (5), preferably by a time sequence of at least two voltage pulses or current pulse bursts and/or a time sequence of activation of at least two different induction coils (50).
  8. Method according to any one of the preceding claims, characterised in that for selective heating of the transport belt (3) at least one induction coil (50) of a heating device (5) is selectively switched on and switched off in correspondence with the deformation of the transport belt (3) determined in the profile measurement.
  9. Method according to any one of the preceding claims, characterised in that the profile measurement and/or the heating is or are carried out in a region (700) of a belt tension different from the belt tension of the casting region (300).
  10. Belt casting plant (1) for casting flat metal strips (2) with at least one circulating transport belt (3), wherein at least one measuring device (4) for profile measurement of the transport belt (3) is provided so as to detect the position and extent of deformations (340) of the transport belt (3), and at least one heating device (5) for selective heating of the respectively detected deformation (340) in dependence on the extent of the deformation (340) is provided.
  11. Belt casting plant (1) according to claim 10, characterised in that the measuring device (4) is arranged in front of the heating device (5) in belt running direction.
  12. Belt casting plant (1) according to claim 10 or 11, characterised in that the measuring device (4) can perform a distance measurement and/or a difference measurement, preferably by means of a laser scanning process, a laser measuring curtain, radar, ultrasound and/or image-generating methods.
  13. Belt casting plant (1) according to any one of claims 10 to 12, characterised in that the heating device (5) comprises at least one induction coil (50), preferably an air coil or a coil with a ferrite core.
  14. Belt casting plant (1) according to claim 13, characterised in that the heating device (5) comprises an array of induction coils (50), preferably at least two lines, which extend substantially over the width of the transport belt (3), of induction coils (50), which are, in particular, preferably arranged to be offset relative to one another.
  15. Belt casting plant (1) according to any one of claims 10 to 14, characterised in that at least two tensioning devices, preferably two S roller sets (70, 72), are provided in a free region (310) of the transport belt (3), which tensioning devices received therebetween a region (700) of the transport belt (3) having a belt tension different from that of the casting region (300).
EP13722768.2A 2012-06-01 2013-05-16 Method for operating a conveyor belt of a strip casting system, and strip casting system Active EP2855047B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102012010791 2012-06-01
DE102012223004A DE102012223004A1 (en) 2012-06-01 2012-12-13 Method for operating a conveyor belt of a strip casting plant and strip casting plant
PCT/EP2013/060142 WO2013178478A1 (en) 2012-06-01 2013-05-16 Method for operating a conveyor belt of a strip casting system, and strip casting system

Publications (2)

Publication Number Publication Date
EP2855047A1 EP2855047A1 (en) 2015-04-08
EP2855047B1 true EP2855047B1 (en) 2019-04-10

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ID=49579537

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13722768.2A Active EP2855047B1 (en) 2012-06-01 2013-05-16 Method for operating a conveyor belt of a strip casting system, and strip casting system

Country Status (3)

Country Link
EP (1) EP2855047B1 (en)
DE (1) DE102012223004A1 (en)
WO (1) WO2013178478A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2030306B1 (en) * 2021-12-27 2023-07-03 Trivium Packaging Group Netherlands B V System for servicing a metal transfer belt

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3937270A (en) * 1973-11-09 1976-02-10 Hazelett Strip-Casting Corporation Twin-belt continuous casting method providing control of the temperature operating conditions at the casting belts
AU607226B2 (en) 1987-06-08 1991-02-28 Mitsubishi Heavy Industries, Ltd. Twin belt type continuous casting
DK170090B1 (en) 1988-01-28 1995-05-22 Larex Ag Method of continuous casting and string casting apparatus with at least one traveling molding band for the production of metal bands and strings
US5133402A (en) 1990-11-09 1992-07-28 Ajax Magnethermic Corporation Induction heating of endless belts in a continuous caster
JPH09192789A (en) * 1996-01-19 1997-07-29 Kobe Steel Ltd Belt type continuous casting method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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Publication number Publication date
EP2855047A1 (en) 2015-04-08
WO2013178478A1 (en) 2013-12-05
DE102012223004A1 (en) 2013-12-05

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