EP1427553B1 - Method and device for producing a metal strip in a strip casting machine with rolls - Google Patents
Method and device for producing a metal strip in a strip casting machine with rolls Download PDFInfo
- Publication number
- EP1427553B1 EP1427553B1 EP02779345A EP02779345A EP1427553B1 EP 1427553 B1 EP1427553 B1 EP 1427553B1 EP 02779345 A EP02779345 A EP 02779345A EP 02779345 A EP02779345 A EP 02779345A EP 1427553 B1 EP1427553 B1 EP 1427553B1
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- European Patent Office
- Prior art keywords
- melt
- casting
- molten metal
- coil
- metal bath
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- 238000005266 casting Methods 0.000 title claims abstract description 64
- 239000002184 metal Substances 0.000 title claims abstract description 44
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims description 21
- 239000000155 melt Substances 0.000 claims description 33
- 239000004020 conductor Substances 0.000 claims description 16
- 239000002826 coolant Substances 0.000 claims description 9
- 238000007711 solidification Methods 0.000 claims description 8
- 230000008023 solidification Effects 0.000 claims description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 7
- 239000000919 ceramic Substances 0.000 claims description 7
- 230000002028 premature Effects 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 230000005284 excitation Effects 0.000 claims description 5
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 238000009749 continuous casting Methods 0.000 claims description 2
- 229910000859 α-Fe Inorganic materials 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims 1
- 239000002344 surface layer Substances 0.000 claims 1
- 239000012535 impurity Substances 0.000 abstract description 11
- 230000007704 transition Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000002923 metal particle Substances 0.000 abstract 1
- 239000006228 supernatant Substances 0.000 abstract 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000005499 meniscus Effects 0.000 description 1
- 150000002815 nickel Chemical class 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- 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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
Definitions
- the invention relates to a method for producing a metal strip by a continuous casting of molten metal between two casting rolls of a roll-strip casting machine and to an apparatus for carrying out the method.
- the document EP-A-0 916 434 discloses a device for influencing the surface of a molten metal between two casting rolls with a magnetic field.
- a coil is arranged on both casting rolls and just above the bath surface through which an alternating current is passed.
- a flow in the bath surface in the direction of the casting rolls is effected to influence the angle of the meniscus, or the size of the Schmelzbadwellen, or a flow to create a Barrlere between the waves on the bath surface and the Giessrollen inhabit.
- the present invention has for its object to provide a method of the type mentioned above and an apparatus for performing the method by which the risk of flooding of the impurities and oxides to the casting rollers surfaces and the premature solidification of parts of the molten metal is largely eliminated.
- FIG. 1 schematically two rotatable about horizontal axes casting rolls 1, 2 are indicated, whose directions of rotation are denoted by D 1 , D 2 .
- a metal strip 8 is between the two casting rolls 1, 2 and two arranged in the front side region of the casting rolls 1, 2 side seals 3 on a pouring device 6 poured the liquid metal. Injection devices are known per se and therefore the pouring device 6 will not be described in detail.
- the molten bath is designated 4 in FIG. 1 and its surface 5.
- the metal strip 8 produced is led away in the direction of arrow B by a passage gap 7 between the two cooled casting rolls 1, 2.
- the exit plane of the metal strip 8 corresponds to the middle plane E of the molten bath 4, in which the pouring device 6 is located.
- devices 10, 10 'for generating magnetic rotating fields are arranged close to the casting roll surfaces and extend along the casting rolls 1, 2.
- the directions of rotation of the magnetic rotating fields are designated in Fig. 1 with F 1 , F 2 , whose axes of rotation with A 1 , A 2 .
- the surface currents prevent on the one hand premature, unwanted solidification of parts of the melt at the transition casting roll surface / melt surface, and on the other hand, the impurities and oxides of the casting rolls surfaces and their entrainment by the casting rolls 1, 2.
- the impurities and oxides are transported away from the casting rolls and can be removed along the pouring device 6 located in the middle level E.
- the casting rolls 1, 2 are generally provided with a nickel layer on their surface. Also in this nickel layer eddy currents are generated by the magnetic rotating fields, which lead locally to a slight increase in temperature, whereby the risk of premature solidification of the melt on the cooled roll surface is additionally reduced.
- FIG. 2 shows a coil system 10'a arranged near the transition between the melt surface 5 / casting roll 2 above the melt bath 4 and extending along the casting roll 2, comprising a stationary coil support 15 of circular cross-section, on whose circumference a number of conductors 16 or coils is arranged. These are switched such that with a polyphase excitation by phase-shifted alternating current in the direction of rotation F 2 rotating magnetic field is created, whose course is indicated in Fig. 2 with line FV. The axis of rotation A 2 of this rotating field coincides with the axis of the bobbin 15.
- the molten metal at the melt surface 5 is forced away from the casting roll 2 in the direction of the arrow S 2 by the rotating field in interaction with the fields of the electrical eddy currents generated in the melt and flattened.
- the surface of the melt is thereby calmed and prevents the "swirling up" of the liquid metal and the impurities to the casting roll surface.
- the impurities and oxides are forced to the middle level E of the molten bath 4.
- the supply of the coil system 10'a and the supply of the opposite, the other casting roll 1 associated coil system takes place separately, including known multiphase, adjustable electronic power supply units are used.
- the field strength and the frequency can be optimally adapted to the requirements of the casting process.
- the position of the respective coil system can be detected above the melt surface 5 by suitable sensors and controlled in an optimized manner to the process.
- the excitation of the coils can be done with a multi-phase alternating current of a sinusoidal, rectangular or other suitable pulse shape.
- FIG. 3 shows a coil system 10'b with coils offset by 120 ° (see conductors 16x, 16y, 16z, 16u, 16v, 16w on the circumference of the coil carrier 15) which are excited by a three-phase alternating current.
- Fig. 4 is a turn fixed coil carrier 15c of a coil system 10'c with a melt surface 5 facing and parallel to this lower surface 18c provided, the several, optionally three conductors 16w, 16x, 16v are assigned, which are parallel and at the same distance extend to the melt surface 5, whereby the flow effect in the melt (see arrow S 2 ) is additionally enhanced.
- FIG. 5 The same effect is also achieved with a coil system 10'd shown in FIG. 5, which has a coil support 15d of rectangular cross section, again a lower surface 18d facing the molten bath surface 5 with a number of parallel and above the molten bath surface 5 is provided to this lying conductors 16d.
- the coil carrier 15d has a central channel 20 through which a cooling medium flows.
- the cooling of the coil system preferably takes place with the inert cooling gas present in any case, so that the cooling effort is low. If higher powers of the coil system are required, N 2 can be used in liquid form as cooling medium.
- the bobbin 15e is further provided with a number, optionally with six circumferentially spaced recesses 23 which together form with the inner surface 24 of the ceramic tube 22 a number of other, through which cooling medium flowed through cooling channels 25.
- the coil system 10f according to FIG. 7 comprises, in addition to the coil support 15, which in turn is accommodated in the ceramic tube 22, a field shield 27, which is arranged on the side of the coil support 15 facing away from the molten bath surface 5.
- the existing field shield 27 to prevent unwanted stray fields and to enhance the effect to be achieved is preferably made of sheet steel or ferrite.
- the conductors are preferably isolated with a temperature resistant oxide (e.g., pyrothenaxon insulation).
- the conductors can also be flowed through directly by a cooling medium.
- the excitation of the coils is feasible with a small cross section of cable feeds.
- the conductors or coils run spirally on the circumference of the respective coil carrier. Then, namely, the melt receives an additional, directed against the side seal (or side seals) 3 force component, which is used for Wegtransport Schlue of impurities and oxides.
- FIGS. 8 and 9 Another type of rotary magnetic field generating apparatus 10'h, 10i is shown in FIGS. 8 and 9.
- rotating magnet carrier 30h or 30i along the melt surface are arranged along the respective casting roll 1, 2, to each of which a number of cooled permanent magnets 31h and 31i is attached.
- the rotation of the permanent magnet arrangement again produces magnetic rotating fields which cause local eddy currents and thereby also the desired flow in the melt.
- This can also local eddy currents in the surface nickel layer of the casting rolls 1, 2 are generated, which is a slight local Increase the temperature on the casting roll surface and counteract the premature solidification of the melt at these points.
- the magnetic carriers 30h, 30i also each have a central channel 33, through which a cooling medium flows or otherwise arranged cooling openings, and are surrounded by a ceramic tube 32.
- the permanent magnets 31 h are arranged in the circumferential direction of the magnet carrier 30 h.
- the permanent magnets 31 i are arranged radially to the axis of rotation A 1 of the magnet carrier 30 i.
- the rotational axis A 2 and A 1 of the magnetic carrier 30h and 30i is at the same time the rotational axis of the magnetic rotating field in both variants.
- inventive method and the inventive devices for performing the method allow a significant increase in quality of the metal strip to be produced and are still operationally simple and inexpensive.
- damping and flattening of the waves in the liquid region can be achieved in order to obtain straight solidification lines.
- the two devices 10 and 10 ' are preferably controlled such that the solidification lines form at the same height.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Rolls And Other Rotary Bodies (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Herstellung eines Metallbandes durch einen kontinuierlichen Einguss von Metallschmelze zwischen zwei Giessrollen einer Rollen-Bandgiessmaschine sowie eine Vorrichtung zum Durchführen des Verfahrens.The invention relates to a method for producing a metal strip by a continuous casting of molten metal between two casting rolls of a roll-strip casting machine and to an apparatus for carrying out the method.
Beim Giessen eines Metallbandes in der eingangs genannten Art schwimmt auf der Schmelzbadoberfläche zwischen den Giessrollen eine Schicht von Verunreinigungen und Oxiden. Ausserdem entstehen durch die Zuführung des flüssigen Metalls und die Bewegung der Giessrollen Obertiächenwellen und Oberflächenströmungen in der Schmelze, die ein "Emporschwappen" des flüssigen Metalls und der Verunreinigungen an den Giessrollen bewirken. Dadurch besteht die Gefahr, dass Teile der Schmelze an den gekühlten Giessrollen intensiver abgekühlt werden und vorzeitig erstarren. Auch werden die Verunreinigungen und Oxide durch die unruhige Schmelzbadoberfläche an die Giessrol. Ion-Oberflächen gespült und durch die Giessrollen mitgeschleppt. Dies bedeutet Unregelmässlgkeiten an der Bandoberfläche und Verschlechterung der Bandqualität.When casting a metal strip in the aforementioned type floats on the melt surface between the casting rolls a layer of impurities and oxides. In addition, caused by the supply of the liquid metal and the movement of the casting rolls Obertiächenwellen and surface currents in the melt, which cause a "sloshing" of the liquid metal and the impurities on the casting rolls. As a result, there is a risk that parts of the melt on the cooled casting rolls are cooled more intensely and solidify prematurely. Also, the impurities and oxides through the turbulent surface of the molten bath to the Giessrol. Rinsed ion surfaces and dragged through the casting rolls. This means irregularities on the strip surface and deterioration of the strip quality.
Das Dokument EP-A-0 916 434 offenbart eine Einrichtung zur Beeinflussung der Oberfläche einer Metallschmelze zwischen zwei Giessrollen mit einem magnetischen Feld. Hierbei wird eine Spule an beiden Giessrollen und knapp oberhalb der Badoberfläche angeordnet, durch die ein wechselnder Strom geführt wird. Hierdurch wird jedoch eine Strömung in der Badoberfläche in Richtung der Giessrollen bewirkt zur Beeinflussung des Winkels des Meniskus, oder der Größe der Schmelzbadwellen, bzw. eine Strömung zur Schaffung einer Barrlere zwischen den Wellen an der Badoberfläche und den Giessrollenflächen.The document EP-A-0 916 434 discloses a device for influencing the surface of a molten metal between two casting rolls with a magnetic field. Here, a coil is arranged on both casting rolls and just above the bath surface through which an alternating current is passed. As a result, however, a flow in the bath surface in the direction of the casting rolls is effected to influence the angle of the meniscus, or the size of the Schmelzbadwellen, or a flow to create a Barrlere between the waves on the bath surface and the Giessrollenflächen.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Verfahren der eingangs genannten Art sowie eine Vorrichtung zum Durchführen des Verfahrens vorzuschlagen, durch welche die Gefahr des Anschwemmens der Verunreinigungen und Oxide an die Giessrollen-Oberflächen und des vorzeitigen Erstarrens von Teilen der Metallschmelze weitgehend eliminiert wird.The present invention has for its object to provide a method of the type mentioned above and an apparatus for performing the method by which the risk of flooding of the impurities and oxides to the casting rollers surfaces and the premature solidification of parts of the molten metal is largely eliminated.
Diese Aufgabe wird erfindungsgemäss durch ein Verfahren mit den Merkmalen des Anspruches 1 sowie durch eine Vorrichtung mit den Merkmalen des Anspruches 11 oder 20 gelöst.This object is achieved according to the invention by a method having the features of
Bevorzugte Weitergestaltungen der Erfindung bilden den Gegenstand abhängiger Ansprüche.Preferred embodiments of the invention form the subject of the dependent claims.
Dadurch, dass oberhalb des Schmelzbades nahe dem jeweiligen Übergang Schmelzbadoberfläche/Giessrolle je ein magnetisches Drehfeld und somit in der Schmelze lokal Wirbelströme erzeugt werden, derart, dass eine flache Oberflächenströmung in der Schmelze entsteht, die von den Giessrollen weg zur mittleren Ebene des Schmelzbades hin, d.h. zur Austrittsebene des Metallbandes, gerichtet ist, wird mit geringem Energieaufwand die unerwünschte, vorzeitige Erstarrung der Teile der Metallschmelze entlang der Giessrollenkanten verhindert. Die Verunreinigungen und Oxide werden von den Giessrollen wegtransportiert.Characterized in that eddy currents are generated in each case above the molten bath near the respective molten bath surface / casting roll transition zone and thus locally in the melt, such that a flat surface flow arises in the molten mass which leads away from the casting rolls towards the middle level of the molten bath, ie directed to the exit plane of the metal strip, the undesired, premature solidification of the parts of the molten metal along the Gießrollenkanten is prevented with low energy consumption. The impurities and oxides are transported away by the casting rolls.
Die Erfindung wird nachfolgend anhand der Zeichnung näher erläutert.
Es zeigen rein schematisch:
- Fig. 1
- zwei Giessrollen einer Rollen-Bandgiessmaschine mit einem Metallschmelzbad dazwischen und mit je einer oberhalb der Schmelzbadoberfläche angeordneten, sich entlang der jeweiligen Giessrolle erstreckenden Vorrichtung zur Erzeugung einer Oberflächenströmung in der Schmelze; und
- Fig. 2 bis 9
- verschiedene Ausführungsbeispiele der Vorrichtung nach Fig. 1.
It shows purely schematically:
- Fig. 1
- two casting rolls of a roll strip casting machine with a molten metal bath therebetween and with one device each arranged above the melt bath surface and extending along the respective casting roll for producing a surface flow in the melt; and
- Fig. 2 to 9
- Various embodiments of the device according to FIG. 1.
In Fig.1 sind schematisch zwei um horizontale Achsen drehbare Giessrollen 1, 2 angedeutet, deren Drehrichtungen mit D1, D2 bezeichnet sind. Zur Erzeugung eines Metallbandes 8 wird zwischen die beiden Giessrollen 1, 2 und zwei im Stirnseitenbereich der Giessrollen 1, 2 angeordnete Seitenabdichtungen 3 über eine Eingiessvorrichtung 6 das flüssige Metall eingegossen. Eingiessvorrichtungen sind an sich bekannt und es wird daher die Eingiessvorrichtung 6 nicht näher beschrieben. Das Schmelzbad ist in Fig. 1 mit 4, seine Oberfläche mit 5 bezeichnet. Das erzeugte Metallband 8 wird durch einen Durchgangsspalt 7 zwischen den beiden, gekühlten Giessrollen 1, 2 in Pfeilrichtung B weggeführt. Die Austrittsebene des Metallbandes 8 entspricht der mittleren Ebene E des Schmelzbades 4, in der auch die Eingiessvorrichtung 6 liegt.In Figure 1 schematically two rotatable about horizontal
Oberhalb der Schmelzbadoberfläche 5 sind erfindungsgemäss nahe den Giessrollen-Oberflächen Vorrichtungen 10, 10' zur Erzeugung von magnetischen Drehfeldern angeordnet, die sich entlang der Giessrollen 1, 2 erstrecken. Verschiedene Ausführungsbeispiele dieser Vorrichtungen werden weiter unten anhand der Fig. 2 bis 9 näher beschrieben. Die Drehrichtungen der magnetischen Drehfelder sind in Fig. 1 mit F1, F2 bezeichnet, deren Drehachsen mit A1, A2. Durch die magnetischen Drehfelder werden in der elektrisch leitenden Metallschmelze lokale elektrische Wirbelströme erzeugt, welche Kräfte auf die leitende Schmelze ausüben, derart, dass in der Schmelze Oberflächenströmungen entstehen, die von den Giessrollen 1, 2 weg zur mittleren Ebene E des Schmelzbades 4 gerichtet sind (vgl. Pfeile S1, S2). Die Oberflächenströmungen verhindern einerseits vorzeitige, unerwünschte Erstarrung von Teilen der Schmelze am Übergang Giessrollenoberfläche/Schmelzbadoberfläche, und anderseits das Anschwemmen von Verunreinigungen und Oxiden an den Giessrollen-Oberflächen und deren Mitschleppen durch die Giessrollen 1, 2. Die Verunreinigungen und Oxide werden von den Giessrollen wegtransportiert und können entlang der sich in der mittleren Ebene E befindenden Eingiessvorrichtung 6 entfernt werden.Above the
Bekanntlich sind die Giessrollen 1, 2 an ihrer Oberfläche in der Regel mit einer Nickelschicht versehen. Auch in dieser Nickelschicht werden durch die magnetischen Drehfelder Wirbelströme erzeugt, die lokal zu einer leichten Temperaturerhöhung führen, wodurch die Gefahr der vorzeitigen Erstarrung der Schmelze an der gekühlten Walzenoberfläche zusätzlich reduziert wird.As is known, the
Im folgenden werden nun verschiedene Ausführungsbeispiele der Vorrichtungen 10, 10' zur Erzeugung von magnetischen Drehfeldern anhand der Fig. 2 bis 9 näher beschrieben.In the following, various embodiments of the
Fig. 2 zeigt ein nahe dem Übergang Schmelzbadoberfläche 5/Giessrolle 2 oberhalb des Schmelzbades 4 angeordnetes und sich entlang der Giessrolle 2 erstreckendes Spulensystem 10'a, das einen ortsfesten Spulenträger 15 kreisförmigen Querschnitts umfasst, an dessen Umfang eine Anzahl von Leitern 16 bzw. Spulen angeordnet ist. Diese werden derart geschaltet, dass mit einer mehrphasigen Erregung durch phasenverschobenen Wechselstrom ein in Drehrichtung F2 drehendes magnetisches Feld entsteht, dessen Verlauf in Fig. 2 mit Linie FV angedeutet ist. Die Drehachse A2 dieses Drehfeldes fällt mit der Achse des Spulenträgers 15 zusammen. Wie bereits erwähnt wird die Metallschmelze an der Schmelzbadoberfläche 5 durch das Drehfeld in Wechselwirkung mit den Feldern der in der Schmelze erzeugten elektrischen Wirbelströme von der Giessrolle 2 in Pfeilrichtung S2 weggedrängt und flachgedrückt. Die Oberfläche der Schmelze wird dadurch beruhigt und das "Emporschwappen" des flüssigen Metalls und der Verunreinigungen an die Giessrollen-Oberfläche verhindert. Die Verunreinigungen und Oxide werden zur mittleren Ebene E des Schmelzbades 4 gedrängt. Durch eine elektronische Anspeisung des Spulensystems 10'a kann mit Vorteil die Erregung der Spulen bezüglich der Frequenz und Intensität in Abhängigkeit der Giessparameter reguliert werden. Vorzugsweise findet dabei die Anspeisung des Spulensystems 10'a und die Anspeisung des gegenüberliegenden, der anderen Giessrolle 1 zugeordneten Spulensystems separat statt, wozu an sich bekannte mehrphasige, regulierbare elektronische Speisegeräte verwendet werden. Dadurch kann die Feldstärke und die Frequenz optimal an die Erfordernisse des Giessprozesses angepasst werden. Zudem kann die Lage der jeweiligen Spulensystems über der Schmelzbadoberfläche 5 durch geeignete Sensoren erfasst und auf den Prozess optimiert geregelt werden.FIG. 2 shows a coil system 10'a arranged near the transition between the
Die Erregung der Spulen kann mit einem mehrphasigen Wechselstrom von einer sinusförmigen, rechteckförmigen oder einer anderen geeigneten Pulsform erfolgen.The excitation of the coils can be done with a multi-phase alternating current of a sinusoidal, rectangular or other suitable pulse shape.
Fig. 3 zeigt ein Spulensystem 10'b mit um 120° elektrisch versetzten Spulen (vgl. Leiter 16x, 16y, 16z; 16u, 16v, 16w am Umfang des Spulenträgers 15), die durch einen dreiphasigen Wechselstrom erregt werden.3 shows a coil system 10'b with coils offset by 120 ° (see
Gemäss Fig. 4 ist ein wiederum ortsfester Spulenträger 15c eines Spulensystem 10'c mit einer der Schmelzbadoberfläche 5 zugewandten und zu dieser parallelen unteren Fläche 18c versehen, der mehrere, gegebenenfalls drei Leiter 16w, 16x, 16v zugeordnet sind, die parallel und im gleichen Abstand zur Schmelzbadoberfläche 5 verlaufen, wodurch der Strömungseffekt in der Schmelze (vgl. Pfeilrichtung S2) zusätzlich verstärkt wird.According to Fig. 4 is a turn fixed coil carrier 15c of a coil system 10'c with a
Der gleiche Effekt wird auch mit einem in Fig. 5 dargestellten Spulensystem 10'd erreicht, das einen Spulenträger 15d rechteckigen Querschnitts aufweist, wobei wiederum eine der Schmelzbadoberfläche 5 zugewandte untere Fläche 18d mit einer Anzahl von parallel oberhalb der Schmelzbadoberfläche 5 verlaufenden und im gleichen Abstand zu dieser liegenden Leitern 16d versehen ist. Der Spulenträger 15d weist einen zentralen, von einem Kühlmedium durchströmten Kanal 20. Die Kühlung des Spulensystems erfolgt vorzugsweise mit dem ohnehin vorhandenen inerten Kühlgas, so dass der Kühlaufwand gering ist. Sind höhere Leistungen des Spulensystems erforderlich, kann als Kühlmedium N2 in flüssiger Form eingesetzt werden.The same effect is also achieved with a
Einen zentralen, von einem Kühlmedium durchströmten Kanal 20 weist auch der Spulenträger 15e des in Fig. 6 dargestellten Spulensystems 10'e auf. Der wiederum einen kreisförmigen Querschnitt aufweisende, am Umfang mit Leitern 16e versehene Spulenträger 15e ist innerhalb eines Keramikrohres 22 untergebracht. Der Spulenträger 15e ist ferner mit einer Anzahl, gegebenenfalls mit sechs über den Umfang verteilten Ausnehmungen 23 versehen, die zusammen mit der Innenfläche 24 des Keramikrohres 22 eine Anzahl von weiteren, vom Kühlmedium durchströmten Kühlkanälen 25 bilden.A
Das Spulensystem 10f nach Fig.7 umfasst ausser dem wiederum im Keramikrohr 22 untergebrachten Spulenträger 15 eine Feldabschirmung 27, die auf der der Schmelzbadoberfläche 5 abgewandten Seite des Spulenträgers 15 angeordnet ist. Die zur Verhinderung unerwünschter Streufelder und zur Verstärkung der zu erzielender Wirkung vorhandene Feldabschirmung 27 besteht vorzugsweise aus Stahlblech oder Ferrit.The
Bei allen vorstehend beschriebenen Spulensystemen werden die Leiter vorzugsweise mit einem temperaturbeständigen Oxid isoliert (z.B. Pyrothenaxon-Isolation). Die Leiter können auch direkt durch ein Kühlmedium durchströmt werden. Die Erregung der Spulen ist mit kleinem Querschnitt von Kabelzuführungen machbar.In all of the coil systems described above, the conductors are preferably isolated with a temperature resistant oxide (e.g., pyrothenaxon insulation). The conductors can also be flowed through directly by a cooling medium. The excitation of the coils is feasible with a small cross section of cable feeds.
Besonders vorteilhaft ist es, wenn die Leiter bzw. Spulen am Umfang des jeweiligen Spulenträgers spiralförmig verlaufen. Dann erhält nämlich die Schmelze noch eine zusätzliche, gegen die Seitenabdichtung (oder Seitenabdichtungen) 3 gerichtete Kraftkomponente, die zum Wegtransportieren von Verunreinigungen und Oxiden ausgenutzt wird.It is particularly advantageous if the conductors or coils run spirally on the circumference of the respective coil carrier. Then, namely, the melt receives an additional, directed against the side seal (or side seals) 3 force component, which is used for Wegtransportieren of impurities and oxides.
Eine andere Art von Vorrichtungen 10'h, 10i zur Erzeugung von magnetischen Drehfeldern ist in Fig. 8 und 9 dargestellt. Statt ortsfester Spulensysteme werden oberhalb der Schmelzbadoberfläche 5 rotierende Magnetträger 30h bzw. 30i entlang der jeweiligen Giessrolle 1, 2 angeordnet, an denen jeweils eine Anzahl von gekühlten Dauermagneten 31h bzw. 31i befestigt ist. Durch die Rotation der Dauermagnetanordnug entstehen wiederum magnetische Drehfelder, die lokale Wirbelströme und dadurch auch die gewünschte Strömung in der Schmelze bewirken. Auch können dadurch lokale Wirbelströme in der Oberflächen-Nickelschicht der Giessrollen 1, 2 erzeugt werden, die einen leichten lokalen Temperaturanstieg an der Giessrollen-Oberfläche verursachen und der vorzeitigen Erstarrung der Schmelze an diesen Stellen entgegenwirken.Another type of rotary magnetic field generating apparatus 10'h, 10i is shown in FIGS. 8 and 9. Instead of fixed
Auch die Magnetträger 30h, 30i weisen jeweils einen zentralen, von einem Kühlmedium durchströmten Kanal 33 oder anderweitig angeordnete Kühlöffnungen auf und sind von einem Keramikrohr 32 umgeben.The
Bei der in Fig. 8 dargestellten Variante sind die Dauermagnete 31 h in Umfangsrichtung des Magnetträgers 30h angeordnet. Bei der Ausführung nach Fig. 9 sind die Dauermagnete 31 i radial zur Drehachse A1 des Magnetträgers 30i angeordnet. Die Drehachse A2 bzw. A1 des Magnetträgers 30h bzw. 30i ist bei beiden Varianten gleichzeitig die Drehachse des magnetischen Drehfeldes.In the variant shown in FIG. 8, the
Das erfindungsgemässe Verfahren sowie die erfindungsgemässen Vorrichtungen zum Durchführen des Verfahrens ermöglichen eine wesentlichen Qualitätssteigerung des zu erzeugenden Metallbandes und sind dennoch betriebstechnisch einfach und kostengünstig.The inventive method and the inventive devices for performing the method allow a significant increase in quality of the metal strip to be produced and are still operationally simple and inexpensive.
Mit diesem Verfahren kann ausserdem eine Dämpfung und Verflachung der Wellen im flüssigen Bereich erzielt werden, um gerade Erstarrungslinien zu erhalten. Die beiden Vorrichtungen 10 und 10' sind vorzugsweise derart gesteuert, dass sich die Erstarrungslinien auf gleicher Höhe bilden.With this method, moreover, damping and flattening of the waves in the liquid region can be achieved in order to obtain straight solidification lines. The two
Claims (22)
- Method of producing a metal strip (8) by continuous casting of a metal melt between two casting rolls (1, 2) of a roll strip casting machine, whereby magnetic fields arise a surface flow in the melt,
characterized in that
above the molten metal bath (4) proximal to the respective interface between the molten metal bath surface (5) and the casting roll (1 or 2) a respective magnetic rotary field and thus local eddy currents in the melt are generated, such that a surface flow arises in the melt, which is directed away from the casting rolls (1, 2) toward the median plane (E) of the molten metal bath (4), that is toward the outlet plane of the metal strip (8). - Method according to claim 1,
characterized in that
by means of the rotary magnetic fields, local eddy currents are produced in a surface layer of the casting roll, which preferably consists nickel, where a slight local temperature increase arises at the casting roll surface, which counteracts a premature solidification of the metal melt. - Method according to claim 1 or 2,
characterized in that
the rotary magnetic fields are produced by coil systems (10'a; 10'b; 10'c; 10'd; 10'e; 10f) extending along the casting rolls (1, 2) above the molten metal bath (4), with each coil system having a coil carrier (15; 15c; 15d; 15e), on the periphery of which conductors (16; 16x, 16y, 16z, 16v, 16u, 16w) or coils are so arranged and switched, that the magnetic field is produced by a multiphasal alternating current which can be regulated as required with respect to frequency and intensity and can be phase shifted, the magnetic rotary field interacting with the field of eddy currents on the molten metal bath surface (5) to displace the melt away from the casting rolls (1, 2). - Method according to claim 3,
characterized in that
the excitation of the coils with multiphasal alternating current is effected with a sinusoidal, rectangular or other suitable pulse shape. - Method according to claim 3,
characterized in that
the conductors (16x, 16y, 16z, 16v, 16u, 16w) are electrically offset through 120° about the periphery of the coil carrier (15) and are excited by a three-phase alternating current. - Method according to any one of the claims 3 to 5,
characterized in that
with a spiral pattern of the conductors (16; 16x, 16y, 16z, 16v, 16u, 16w) at the periphery of the coil carrier (15; 15c; 15d; 15e) an additional force component is produced at the molten metal bath surface (5) and is oriented counter to a force component directed toward the casting roll ends. - Method according to any one of the claims 3 to 6,
characterized in that
a separate electronic feed is provided for the coil systems (10'a; 10'b; 10'c; 10'd; 10'e; 10f) arranged along the two casting rolls (1, 2). - Method according to any one of the claims 3 to 7,
characterized in that
the positions of the coil systems (10'a; 10'b; 10'c; 10'd; 10'e; 10f) with reference to the molten metal bath surface (5) are measured and controlled. - Method according to any one of the claims 3 to 8,
characterized in that
by means of a linear conductor arrangement parallel and at the same distance to the molten metal bath surface (5), the surface flow in the melt is increased. - Method according to claim 1,
characterized in that
the rotational magnetic field is produced by rotation of a magnet carrier (30h; 30i) arranged above the molten metal bath (4) along the respective casting roll (1, 2) and provided with a number of cooled permanent magnets (31 h; 31 i). - Apparatus for producing a metal strip (8) pouring metal melt between two casting rolls (1, 2) of a roll strip casting machine with devices for producing a surface flow in the melt, for carrying out the method according to one of the claims 1 to 9,
characterized in that
above the molten metal bath (4) and along each of the respective casting roll there is a coil system (10'a; 10'b; 10'c; 10'd; 10'e; 10f), which encompasses a fixed coil carrier (15; 15c; 15d; 15e) on the periphery of which a number of multiphasal conductors (16; 16x, 16y, 16z, 16v, 16u, 16w) or coils are fixed, whereby local eddy currents in the melt are generated, such that a surface flow arises in the melt, which is directed away from the casting rolls (1, 2) toward the median plane (E) of the molten metal bath (4), that is toward the outlet plane of the metal strip (8). - Apparatus according to claim 11,
characterized in that
the coil carrier (15d; 15e) is provided with at least one channel (20) traversed by a cooling medium. - Apparatus according to claim 11 or 12,
characterized in that
the coil carrier (15d; 15e) have a circular cross section. - Apparatus according to claim 13,
characterized in that
the coil carrier (15; 15e) are surrounded by a ceramic tube (22). - Apparatus according to claim 14,
characterized in that
the coil carrier (15e) at the periphery has a number of recesses (23) which, together with the inner surface (24) of the ceramic tube (22) form a number of cooling passages (25). - Apparatus according to claim 11 or 12,
characterized in that
the coil carrier (15c; 15d) has a surface (18c; 18d) parallel to the molten metal bath surface (5), which is provided with a number of conductors (16w, 16x, 16v; 16d) arrayed alongside one another. - Apparatus according to any one of the claims 11 to 16,
characterized in that
the coil system (10'a; 10'b; 10'c; 10'd; 10'e; 10f) is directly surrounded by a conductor traversed by a cooling medium. - Apparatus according to any one of the claims 11 to 17,
characterized in that
the coil system (10'a; 10'b; 10'c; 10'd; 10'e; If) has conductors which are insulated by temperature-resistant oxides. - Apparatus according to any one of the claims 11 to 18,
characterized in that
above the coil system (10f) a field shield (27) preferably of sheet metal or ferrite is arranged. - Apparatus for producing a metal strip (8) pouring metal melt between two casting rolls (1, 2) of a roll strip casting machine with devices for producing a surface flow in the melt, for carrying out the method according to claim 1 or 2,
characterized in that
a at least a respective rotatable bore magnet carrier (30h; 30i) is arranged above the molten metal bath (4) along the respective casting roll (1, 2) provided with a number of cooled permanent magnets (31 h; 31 i), whereby the magnet carrier can be rotated such, that a surface flow arises in the melt, which is directed away from the casting rolls (1, 2) toward the median plane (E) of the molten metal bath (4), that is toward the outlet plane of the metal strip (8). - Apparatus according to claim 20,
characterized in that
the magnet carrier (30h; 30i) is provided with at least one passage (33) traversed by a cooling medium. - Apparatus according to claim 20 or 21,
characterized in that
the magnet carrier (30h; 30i) provided with the permanent magnet (31 h; 31 i) is located within a ceramic tube (32).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH01716/01A CH695090A5 (en) | 2001-09-18 | 2001-09-18 | A method and an apparatus for producing a metal strip on a roll strip casting machine. |
| CH17162001 | 2001-09-18 | ||
| PCT/EP2002/010276 WO2003024643A2 (en) | 2001-09-18 | 2002-09-13 | Method and device for producing a metal strip in a strip casting machine with rolls |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1427553A2 EP1427553A2 (en) | 2004-06-16 |
| EP1427553B1 true EP1427553B1 (en) | 2006-06-21 |
Family
ID=4566014
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02779345A Expired - Lifetime EP1427553B1 (en) | 2001-09-18 | 2002-09-13 | Method and device for producing a metal strip in a strip casting machine with rolls |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US6923245B2 (en) |
| EP (1) | EP1427553B1 (en) |
| CN (1) | CN1250362C (en) |
| AT (1) | ATE330734T1 (en) |
| AU (1) | AU2002342685A1 (en) |
| CH (1) | CH695090A5 (en) |
| DE (1) | DE50207323D1 (en) |
| WO (1) | WO2003024643A2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT414103B (en) * | 2003-05-19 | 2006-09-15 | Voest Alpine Ind Anlagen | METHOD FOR PRODUCING A CAST METAL STRIP AND TWO ROLLER CASTING DEVICE THEREFOR |
| DE102004017443B3 (en) * | 2004-04-02 | 2005-04-21 | Technische Universität Dresden | Device for stirring electrically conducting liquids in a container to control material and heat exchange comprises a control/regulating unit with an interrupting unit and a computer |
| DE102007014806A1 (en) * | 2007-03-28 | 2008-10-02 | Schott Ag | Production of flat glass according to the float method comprises inducing a magnetic field in a molten metal in the region of a float chamber and spreading and forming a flat glass band via the influenced molten metal flow |
| CN102310174B (en) * | 2011-09-07 | 2013-06-05 | 中国科学院金属研究所 | Method and device for improving metal solidification defects and refining solidification textures |
| CN104057046A (en) * | 2013-03-21 | 2014-09-24 | 宝山钢铁股份有限公司 | Low-frequency pulse electromagnetic casting method |
| CA3178979A1 (en) | 2014-05-21 | 2015-11-26 | Novelis Inc. | Non-contacting molten metal flow control |
| DE102019104145A1 (en) | 2019-02-19 | 2020-08-20 | Sma Solar Technology Ag | Method for switching off power semiconductor switches of a bridge circuit, bridge circuit and inverter comprising a bridge circuit |
| CN110270669B (en) * | 2019-07-31 | 2021-10-26 | 东北大学 | Method for deformation of meniscus of slab crystallizer under condition of magnetic pressure constraint control of high pulling speed |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6221443A (en) * | 1985-07-22 | 1987-01-29 | Mitsubishi Heavy Ind Ltd | Continuous casting device for thin sheet |
| JPS6277158A (en) * | 1985-09-30 | 1987-04-09 | Nippon Steel Corp | Device for controlling flow of molten metal for twin roll type continuous casting installation |
| FR2664513A1 (en) * | 1990-07-16 | 1992-01-17 | Siderurgie Fse Inst Rech | METHOD AND DEVICE FOR CONTROLLING THE THIN BAND CONTINUOUS CASTING THICKNESS OF ELECTROCONDUCTIVE MATERIAL. |
| AUPN426095A0 (en) * | 1995-07-19 | 1995-08-10 | Bhp Steel (Jla) Pty Limited | Method and apparatus for giving vibration to molten metal in twin roll continuous casting machine |
| ZA987528B (en) * | 1997-11-18 | 1999-02-23 | Inland Steel Co | Electromagnetic meniscus control in continuous casting |
| JPH11170005A (en) * | 1997-12-08 | 1999-06-29 | Nippon Steel Corp | Continuos casting equipment by endless rotary body |
-
2001
- 2001-09-18 CH CH01716/01A patent/CH695090A5/en not_active IP Right Cessation
-
2002
- 2002-09-13 AU AU2002342685A patent/AU2002342685A1/en not_active Abandoned
- 2002-09-13 CN CNB028182553A patent/CN1250362C/en not_active Expired - Fee Related
- 2002-09-13 EP EP02779345A patent/EP1427553B1/en not_active Expired - Lifetime
- 2002-09-13 US US10/489,228 patent/US6923245B2/en not_active Expired - Fee Related
- 2002-09-13 AT AT02779345T patent/ATE330734T1/en active
- 2002-09-13 DE DE50207323T patent/DE50207323D1/en not_active Expired - Lifetime
- 2002-09-13 WO PCT/EP2002/010276 patent/WO2003024643A2/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| WO2003024643A3 (en) | 2003-10-09 |
| CN1250362C (en) | 2006-04-12 |
| ATE330734T1 (en) | 2006-07-15 |
| US20040244939A1 (en) | 2004-12-09 |
| CH695090A5 (en) | 2005-12-15 |
| WO2003024643A2 (en) | 2003-03-27 |
| DE50207323D1 (en) | 2006-08-03 |
| AU2002342685A1 (en) | 2003-04-01 |
| CN1555299A (en) | 2004-12-15 |
| US6923245B2 (en) | 2005-08-02 |
| EP1427553A2 (en) | 2004-06-16 |
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