EP1483423A1 - Device for hot dip coating metal strands - Google Patents

Device for hot dip coating metal strands

Info

Publication number
EP1483423A1
EP1483423A1 EP03743810A EP03743810A EP1483423A1 EP 1483423 A1 EP1483423 A1 EP 1483423A1 EP 03743810 A EP03743810 A EP 03743810A EP 03743810 A EP03743810 A EP 03743810A EP 1483423 A1 EP1483423 A1 EP 1483423A1
Authority
EP
European Patent Office
Prior art keywords
metal
inductor
guide channel
electromagnetic
metal strand
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP03743810A
Other languages
German (de)
French (fr)
Other versions
EP1483423B1 (en
Inventor
Walter Trakowski
Olaf-Norman Jepsen
Eckart Schunk
Klaus Frommann
Rolf Brisberger
Holger Behrens
Michael Zielenbach
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Siemag AG
Original Assignee
SMS Demag AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SMS Demag AG filed Critical SMS Demag AG
Publication of EP1483423A1 publication Critical patent/EP1483423A1/en
Application granted granted Critical
Publication of EP1483423B1 publication Critical patent/EP1483423B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/24—Removing excess of molten coatings; Controlling or regulating the coating thickness using magnetic or electric fields

Definitions

  • the invention relates to a device for hot-dip coating of metal strands, in particular steel strip, in which the metal strand can be passed vertically through a container holding the molten coating metal and through an upstream guide channel, an electromagnetic inductor being arranged in the area of the guide channel, which is used for holding back of the coating metal in the container by means of an electromagnetic blocking field in the coating metal can induce induction currents which, in interaction with the electromagnetic blocking field, exert an electromagnetic force.
  • the strips are introduced into the dip coating bath from above in an immersion nozzle. Because the coating metal in liquid Form and you want to use gravitation together with blow-off devices to adjust the coating thickness, but the subsequent processes prohibit contact with the strip until the coating metal has completely solidified, the strip must be redirected in the vertical direction in the coating vessel. This happens with a roller that runs in the liquid metal. Due to the liquid coating metal, this role is subject to heavy wear and is the cause of downtimes and thus failures in production.
  • the known dip coating systems also have limit values in the coating speed. These are the limit values for the operation of the scraping nozzle, the cooling processes of the metal strip passing through and the heating process for setting alloy layers in the coating metal. As a result, the top speed is generally limited and, on the other hand, certain metal strips cannot be run at the maximum speed possible for the system.
  • non-ferromagnetic metal strips are thus possible, but problems arise with essentially ferromagnetic steel strips in that they are drawn in the electromagnetic seals by the ferromagnetism to the channel walls, thereby damaging the strip surface. It is also problematic that the coating metal is heated inadmissibly by the inductive fields.
  • the position of the continuous ferromagnetic steel strip through the guide channel between two traveling field inductors is an unstable equilibrium. Only in the middle of the guide channel is the sum of the magnetic attraction forces acting on the tape zero. As soon as the steel strip is deflected from its central position, it comes closer to one of the two inductors as it moves away from the other inductor. Such deflection can be caused by simple belt flatness errors. Any type of band waves in the running direction should be mentioned, seen across the width of the band (center buckles, quarter buckles, edge waves, fluttering, twisting, crossbow, S-shape, etc.). According to an exponential function, the magnetic induction, which is responsible for the magnetic attraction, decreases in its field strength with the distance from the inductor.
  • the attraction decreases with the square of the induction field strength with increasing distance from the inductor.
  • DE 195 35 854 A1 and DE 100 14 867 A1 provide information on solving this problem, that is to say on the exact position control of the metal strand in the guide channel.
  • additional correction coils are provided, which are connected to a control system and ensure that the metal strip is brought back into the middle position when it deviates.
  • the inductors for generating the moving electromagnetic field must have a relatively large overall height, which is due to the required field strength, electrical currents and the sheet metal cores required for this are explained.
  • the height of the inductor is usually around 600 mm. This has negative effects on the height of the submerged metal column in the guide channel.
  • the blocking field inductors are operated with alternating current, the frequency of which is higher than 3 kHz. This ensures that the ferromagnetic attraction is only slight; however, it cannot be avoided entirely. Furthermore, it is disadvantageous that when the metal strand passes through the guide channel, the strand heats up considerably.
  • the invention is therefore based on the object of further developing a device for hot-dip coating of metal strands of the type mentioned at the outset in such a way that the disadvantages mentioned are overcome.
  • an electromagnetic inductor should therefore be designed which has a low overall height and nevertheless does not cause the metal strand to heat up excessively.
  • the inductor is connected to electrical supply means which supply it with an alternating current, the frequency of which is less than 500 Hz; it is preferably provided that the frequency is less than 100 Hz, in particular 50 Hz (mains frequency).
  • the supply means supply the inductor with single-phase alternating current.
  • the inductor advantageously has an induction coil on each side of the guide channel.
  • the device is further equipped with guide means for guiding the metal strand in the guide channel.
  • guide means for guiding the metal strand in the guide channel.
  • the guide means are at least a pair of guide rollers. These are preferably arranged in the lower region of the guide channel or below the guide channel.
  • the guide means comprise at least two correction coils for position control of the metal strand in the guide channel in the direction normal to the surface of the metal strand.
  • the correction coils can be arranged at the same height as the induction coils.
  • the inductor is effective when the electromagnetic inductor for receiving the induction coil and the correction coil has two grooves which run parallel to one another, perpendicular to the direction of movement of the metal strand and perpendicular to the normal direction. The regulation of the metal strand in the guide channel is facilitated if the correction coil arranged in the slots is arranged closer to the metal strand than the induction coil.
  • the regulation can take place more precisely if the inductor has at least two correction coils arranged next to one another on both sides of the metal strand. Furthermore, means can be provided for supplying the correction coils with an alternating current which has the same phase as the current with which the induction coils are operated.
  • the position of the steel strip passing through can be detected by induction field sensors which are operated with a weak measuring field of high frequency.
  • induction field sensors which are operated with a weak measuring field of high frequency.
  • a higher-frequency voltage with low power is superimposed on the induction coils.
  • the higher frequency voltage has no influence on the seal; in the same way there is no heating of the coating metal or steel strip.
  • the higher-frequency induction can be filtered out of the powerful signal of the normal seal and then delivers a signal proportional to the distance from the sensor. This enables the position of the belt in the guide channel to be recorded and regulated.
  • Figure 1 schematically shows a hot-dip coating vessel with a metal strand passed through it
  • Figure 2 shows schematically the section through the guide channel and the inductors with guide rollers arranged underneath;
  • FIG. 3 shows a representation corresponding to FIG. 2 with guide means in the form of correction coils
  • FIG. 4 shows the view of an inductor according to FIG. 3, viewed from the side.
  • FIG. 1 shows the principle of hot-dip coating a metal strand 1, in particular a steel strip.
  • the metal strand to be coated 1 enters the guide channel 4 of the coating system vertically from below.
  • the guide channel 4 forms the lower end of a container 3 which is filled with liquid coating metal 2.
  • the metal strand 1 is guided vertically upwards in the direction of movement X. So that the liquid coating metal 2 cannot run out of the container 3, an electromagnetic inductor 5 is arranged in the region of the guide channel 4. This consists of two halves 5a and 5b, one of which is arranged to the side of the metal strand 1.
  • An electromagnetic blocking field is generated in the electromagnetic inductor 5, which retains the liquid coating metal 2 in the container 3 and thus prevents it from leaking.
  • the inductor 5 is supplied with a single-phase alternating current by an electrical supply means 6.
  • the frequency f of the alternating current is below 500 Hz.
  • Mains frequency, ie 50 or 60 Hz, is preferably used.
  • the more detailed structure of the area of the guide channel 4 can be seen in FIG. 2.
  • the inductor 5 (or its two halves 5a and 5b) has grooves 9, into which an induction coil 7 is inserted, which is supplied with the alternating current and thus generates the electromagnetic blocking field. Particular care must be taken to ensure that the metal strand 1 is guided in the direction N normally onto the strand 1 as centrally as possible in the guide channel 4.
  • guide means 8 are provided, which are formed in FIG. 2 as guide rollers 8a. These are arranged under the guide channel 4 and ensure that the metal strand 1 is inserted centrally into the guide channel 4.
  • both the induction coils 7 and the correction coils 8b are positioned in the grooves 9 of the inductor 5a, 5b, namely at the same height - viewed in the direction of movement X.
  • the correction coils 8b ', 8b “and 8b”' are driven with the same current phase that is present in the induction coil 7, in front of which the correction coils 8b ', 8b ", 8b”' are arranged.

Abstract

The invention relates to a device for hot dip coating metal strands ( 1 ), particularly strip steel, in which the metal strand ( 1 ) can be vertically guided through a reservoir ( 3 ), which accommodates the molten coating metal ( 2 ), and though a guide channel ( 4 ) connected upstream therefrom. An electromagnetic inductor ( 5 ) is mounted in the area of the guide channel ( 4 ) and in order to retain the coating metal ( 2 ) inside the reservoir ( 3 ), can induce induction currents in the coating metal ( 2 ) by means of an electromagnetic blocking field. While interacting with the electromagnetic blocking field, said induction currents exert an electromagnetic force. In order to prevent an intense heating of the metal strand caused by the electromagnetic inductor, the invention provides that the inductor ( 5, 5 a , 5 b) is connected to electric power supply means ( 6 ) that supply the inductor with an alternating current whose frequency (f) is less than 500 Hz. In particular, a mains frequency of 50 Hz is intended.

Description

P T/EP03/01701 P T / EP03 / 01701
Vorrichtung zur Schmelztauchbeschichtung von MetallsträngenDevice for hot dip coating of metal strands
Die Erfindung betrifft eine Vorrichtung zur Schmelztauchbeschichtung von Metallsträngen, insbesondere von Stahlband, in der der Metallstrang vertikal durch einen das geschmolzene Beschichtungsmetall aufnehmenden Behälter und durch einen vorgeschalteten Führungskanal hindurchführbar ist, wobei im Be- reich des Führungskanals ein elektromagnetischer Induktor angeordnet ist, der zum Zurückhalten des Beschichtungsmetalls im Behälter mittels eines elektromagnetischen Sperrfeldes im Beschichtungsmetall Induktionsströme induzieren kann, die in Wechselwirkung mit dem elektromagnetischen Sperrfeld eine elektromagnetische Kraft ausüben.The invention relates to a device for hot-dip coating of metal strands, in particular steel strip, in which the metal strand can be passed vertically through a container holding the molten coating metal and through an upstream guide channel, an electromagnetic inductor being arranged in the area of the guide channel, which is used for holding back of the coating metal in the container by means of an electromagnetic blocking field in the coating metal can induce induction currents which, in interaction with the electromagnetic blocking field, exert an electromagnetic force.
Übliche Metall-Tauchbeschichtungsanlagen für Metallbänder weisen einen wartungsintensiven Teil auf, nämlich das Beschichtungsgefäß mit der darin befindlichen Ausrüstung. Die Oberflächen der zu beschichtenden Metallbänder müssen vor der Beschichtung von Oxidresten gereinigt und für die Verbindung mit dem Beschichtungsmetall aktiviert werden. Aus diesem Grunde werden die Bandoberflächen vor der Beschichtung in Wärmeprozessen in einer reduzierenden Atmosphäre behandelt. Da die Oxidschichten zuvor chemisch oder ab- rasiv entfernt werden, werden mit dem reduzierenden Wärmeprozess die Oberflächen so aktiviert, dass sie nach dem Wärmeprozess metallisch rein vorlie- gen.Conventional metal dip coating systems for metal strips have a maintenance-intensive part, namely the coating vessel with the equipment located therein. The surfaces of the metal strips to be coated must be cleaned of oxide residues before coating and activated for connection to the coating metal. For this reason, the strip surfaces are treated in a reducing atmosphere in heat processes before coating. Since the oxide layers are removed chemically or abrasively beforehand, the reducing heat process activates the surfaces so that they are metallically pure after the heat process.
Mit der Aktivierung der Bandoberfläche steigt aber die Affinität dieser Bandoberflächen für den umgebenden Luftsauerstoff. Um zu verhindern, dass Luftsauerstoff vor dem Beschichtungsprozess wieder an die Bandoberflächen gelangen kann, werden die Bänder in einem Tauchrüssel von oben in das Tauchbeschichtungsbad eingeführt. Da das Beschichtungsmetall in flüssiger Form vorliegt und man die Gravitation zusammen mit Abblasvorrichtungen zur Einstellung der Beschichtungsdicke nutzen möchte, die nachfolgenden Prozesse jedoch eine Bandberührung bis zur vollständigen Erstarrung des Beschichtungsmetalls verbieten, muss das Band im Beschichtungsgefäß in senkrechte Richtung umgelenkt werden. Das geschieht mit einer Rolle, die im flüssigen Metall läuft. Durch das flüssige Beschichtungsmetall unterliegt diese Rolle einem starken Verschleiß und ist Ursache von Stillständen und damit Ausfällen im Produktionsbetrieb.With the activation of the band surface, however, the affinity of these band surfaces for the surrounding atmospheric oxygen increases. In order to prevent atmospheric oxygen from reaching the strip surfaces again before the coating process, the strips are introduced into the dip coating bath from above in an immersion nozzle. Because the coating metal in liquid Form and you want to use gravitation together with blow-off devices to adjust the coating thickness, but the subsequent processes prohibit contact with the strip until the coating metal has completely solidified, the strip must be redirected in the vertical direction in the coating vessel. This happens with a roller that runs in the liquid metal. Due to the liquid coating metal, this role is subject to heavy wear and is the cause of downtimes and thus failures in production.
Durch die gewünschten geringen Auflagedicken des Beschichtungsmetalls, die sich im Mikrometerbereich bewegen können, werden hohe Anforderungen an die Qualität der Bandoberfläche gestellt. Das bedeutet, dass auch die Oberflächen der bandführenden Rollen von hoher Qualität sein müssen. Störungen an diesen Oberflächen führen im allgemeinen zu Schäden an der Bandoberfläche. Dies ist ein weiterer Grund für häufige Stillstände der Anlage.Due to the desired low contact thickness of the coating metal, which can be in the micrometer range, high demands are placed on the quality of the strip surface. This means that the surfaces of the tape-guiding rolls must also be of high quality. Faults on these surfaces generally lead to damage to the belt surface. This is another reason for frequent plant downtimes.
Die bekannten Tauchbeschichtungsanlagen weisen zudem Grenzwerte in der Beschichtungsgeschwindigkeit auf. Es handelt sich dabei um die Grenzwerte beim Betrieb der Abstreifdüse, um die der Abkühlvorgänge des durchlaufenden Metallbandes und die des Wärmeprozesses zur Einstellung von Legierungs- schichten im Beschichtungsmetall. Dadurch tritt der Fall auf, dass zum einen die Höchstgeschwindigkeit generell begrenzt ist und zum anderen bestimmte Metallbänder nicht mit der für die Anlage möglichen Höchstgeschwindigkeit gefahren werden können.The known dip coating systems also have limit values in the coating speed. These are the limit values for the operation of the scraping nozzle, the cooling processes of the metal strip passing through and the heating process for setting alloy layers in the coating metal. As a result, the top speed is generally limited and, on the other hand, certain metal strips cannot be run at the maximum speed possible for the system.
Bei den Tauschbeschichtungsvorgängen finden Legierungsvorgänge für die Verbindung des Beschichtungsmetalls mit der Bandoberfläche statt. Die Eigenschaften und Dicken der sich dabei ausbildenden Legierungsschichten sind stark von der Temperatur im Beschichtungsgefäß abhängig. Aus diesem Grunde muss bei manchen Beschichtungsvorgängen das Beschichtungsmetall zwar flüssig gehalten werden, aber die Temperatur darf bestimmte Grenzwerte nicht überschreiten. Dies läuft dem gewünschten Effekt des Abstreifens des Be- schichtungsmetalls zur Einstellung einer bestimmten Beschichtungsdicke entgegen, da mit fallender Temperatur die für den Abstreifvorgang erforderliche Viskosität des Beschichtungsmetalls ansteigt und damit den Abstreifvorgang erschwert.In the case of the exchange coating processes, alloy processes take place for the connection of the coating metal to the strip surface. The properties and thicknesses of the alloy layers that form depend heavily on the temperature in the coating vessel. For this reason, the coating metal must be kept liquid in some coating processes, but the temperature must not exceed certain limit values. This runs the desired effect of stripping the loading Coating metal to set a certain coating thickness, since the viscosity of the coating metal required for the stripping process increases with falling temperature and thus complicates the stripping process.
Um die Probleme zu vermeiden, die im Zusammenhang mit den im flüssigen Beschichtungsmetall laufenden Rollen stehen, hat es Ansätze dazu gegeben, ein nach unten offenes Beschichtungsgefäß einzusetzen, das in seinem unteren Bereich einen Führungskanal zur vertikalen Banddurchführung nach oben aufweist und zur Abdichtung einen elektromagnetischen Verschluss einzuset- zen. Es handelt sich hierbei um elektromagnetische Induktoren, die mit zurückdrängenden, pumpenden bzw. einschnürenden elektromagnetischen Wechselbzw. Wanderfeldern arbeiten, die das Beschichtungsgefäß nach unten abdichten.In order to avoid the problems associated with the rollers running in the liquid coating metal, attempts have been made to use a coating vessel which is open at the bottom and has a guide channel in its lower region for vertical tape passage upwards and an electromagnetic closure for sealing to be used. These are electromagnetic inductors that work with pushing back, pumping or constricting electromagnetic alternations. Traveling fields work that seal the coating vessel down.
Eine solche Lösung ist beispielsweise aus der EP 0 673 444 B1 bekannt. Einen elektromagnetischen Verschluss zur Abdichtung des Beschichtungsgefäßes nach unten setzt auch die Lösung gemäß der JP 5086446 ein.Such a solution is known for example from EP 0 673 444 B1. The solution according to JP 5086446 also uses an electromagnetic closure for sealing the coating vessel downwards.
Die Beschichtung von nicht ferromagnetischen Metallbändern wird damit zwar möglich, jedoch treten bei im wesentlichen ferromagnetischen Stahlbändern damit Probleme auf, dass diese in den elektromagnetischen Abdichtungen durch den Ferromagnetismus an die Kanalwände gezogen werden, wodurch die Bandoberfläche dadurch beschädigt wird. Weiterhin ist es problematisch, dass das Beschichtungsmetall durch die induktiven Felder unzulässig erwärmt wird.The coating of non-ferromagnetic metal strips is thus possible, but problems arise with essentially ferromagnetic steel strips in that they are drawn in the electromagnetic seals by the ferromagnetism to the channel walls, thereby damaging the strip surface. It is also problematic that the coating metal is heated inadmissibly by the inductive fields.
Bei der Lage des durchlaufenden ferromagnetischen Stahlbandes durch den Führungskanal zwischen zwei Wanderfeldinduktoren handelt es sich um ein labiles Gleichgewicht. Nur in der Mitte des Führungskanals ist die Summe der auf das Band wirkenden magnetischen Anziehungskräfte Null. Sobald das Stahlband aus seiner Mittenlage ausgelenkt wird, gerät es näher an einen der beiden Induktoren, während es sich vom anderen Induktor entfernt. Ursachen für eine solche Auslenkung können einfache Planlagefehler des Bandes sein. Zu nennen wären dabei jegliche Art von Bandwellen in Laufrichtung, gesehen über die Breite des Bandes (Centerbuckles, Quarterbuckles, Randwellen, Flattern, Verdrehen, Crossbow, S-Form etc.). Die magnetische Induktion, die für die magnetische Anziehungskraft verantwortlich ist, nimmt gemäß einer Expo- tentialfunktion mit dem Abstand vom Induktor in ihrer Feldstärke ab. In ähnlicher Weise nimmt daher die Anziehungskraft mit dem Quadrat der Induktionsfeldstärke mit wachsendem Abstand vom Induktor ab. Für das ausgelenkte Band bedeutet das, dass mit der Auslenkung in die eine Richtung die Anziehungskraft zum einen Induktor expotentiell ansteigt, während die rückholende Kraft vom anderen Induktor expotentiell abnimmt. Beide Effekte verstärken sich von selbst, so dass das Gleichgewicht labil ist.The position of the continuous ferromagnetic steel strip through the guide channel between two traveling field inductors is an unstable equilibrium. Only in the middle of the guide channel is the sum of the magnetic attraction forces acting on the tape zero. As soon as the steel strip is deflected from its central position, it comes closer to one of the two inductors as it moves away from the other inductor. Such deflection can be caused by simple belt flatness errors. Any type of band waves in the running direction should be mentioned, seen across the width of the band (center buckles, quarter buckles, edge waves, fluttering, twisting, crossbow, S-shape, etc.). According to an exponential function, the magnetic induction, which is responsible for the magnetic attraction, decreases in its field strength with the distance from the inductor. Similarly, the attraction decreases with the square of the induction field strength with increasing distance from the inductor. For the deflected band, this means that with the deflection in one direction the attraction force to one inductor increases exponentially, while the return force from the other inductor decreases exponentially. Both effects increase automatically, so that the balance is unstable.
Zur Lösung dieses Problems, also zur genauen Lageregelung des Metall- Strangs im Führungskanal, geben die DE 195 35 854 A1 und die DE 100 14 867 A1 Hinweise. Gemäß den dort offenbarten Konzepten sind neben den Spulen zur Erzeugung des elektromagnetischen Wanderfeldes zusätzliche Korrekturspulen vorgesehen, die mit einem Regelungssystem in Verbindung stehen und dafür Sorge tragen, dass das Metallband beim Abweichen von der Mittellage in diese wieder zurückgeholt wird.DE 195 35 854 A1 and DE 100 14 867 A1 provide information on solving this problem, that is to say on the exact position control of the metal strand in the guide channel. According to the concepts disclosed there, in addition to the coils for generating the electromagnetic traveling field, additional correction coils are provided, which are connected to a control system and ensure that the metal strip is brought back into the middle position when it deviates.
Es hat sich bei der Realisierung dieses Prinzips - also des Konzepts des Wan- derfeld-lnduktors mit Korrekturspulen - als nachteilig herausgestellt, dass die Induktoren zur Erzeugung des elektromagnetischen Wanderfeldes eine relativ große Bauhöhe haben müssen, was sich durch die benötigte Feldstärke, elektrischen Ströme und die dafür benötigten Blechkerne erklärt. Die Höhe des Induktors bewegt sich zumeist bei ca. 600 mm. Das hat negative Auswirkungen auf die Höhe der Tauchmetallsäule im Führungskanal.When realizing this principle - that is, the concept of the wandering field inductor with correction coils - it turned out to be disadvantageous that the inductors for generating the moving electromagnetic field must have a relatively large overall height, which is due to the required field strength, electrical currents and the sheet metal cores required for this are explained. The height of the inductor is usually around 600 mm. This has negative effects on the height of the submerged metal column in the guide channel.
Zur Vermeidung dieses Problems ist aus der WO 96/03533 A1 eine gattungsgemäße Vorrichtung bekannt, die zum Zurückhalten des Beschichtungs- materials ein elektromagnetisches Sperrfeld einsetzt, bei der nur eine Induktionsspule zum Einsatz kommt. Die Bauhöhe des Induktors ist damit relativ gering.To avoid this problem, a generic device is known from WO 96/03533 A1, which is used to retain the coating materials uses an electromagnetic blocking field, in which only one induction coil is used. The overall height of the inductor is therefore relatively small.
Beim Durchlauf des Metallstrangs durch den Führungskanal tritt jedoch in nachteiliger Weise eine hohe ferromagnetische Anziehung des Stranges an die Wände des Führungskanals auf. Um dies zu verhindern, ist bei dieser bekannten Anlage vorgesehen, dass die Sperrfeld-Induktoren mit Wechselstrom betrieben werden, dessen Frequenz höher als 3 kHz liegt. Dadurch wird erreicht, dass die ferromagnetische Anziehung nur noch gering ist; allerdings kann sie nicht völlig vermieden werden. Weiterhin ist es nachteilig, dass beim Durchlauf des Metallstrangs durch den Führungskanal eine starke Erwärmung des Strangs auftritt.However, when the metal strand passes through the guide channel, a high ferromagnetic attraction of the strand to the walls of the guide channel occurs disadvantageously. To prevent this, it is provided in this known system that the blocking field inductors are operated with alternating current, the frequency of which is higher than 3 kHz. This ensures that the ferromagnetic attraction is only slight; however, it cannot be avoided entirely. Furthermore, it is disadvantageous that when the metal strand passes through the guide channel, the strand heats up considerably.
Der Erfindung liegt daher die Aufgabe zugrunde, eine Vorrichtung zur Schmelztauchbeschichtung von Metallsträngen der eingangs genannten Art derart weiterzuentwickeln, dass die genannten Nachteile überwunden werden. Es soll somit insbesondere ein elektromagnetischer Induktor konzipiert werden, der eine geringe Bauhöhe aufweist und trotzdem keine starke Erwärmung des Metallstrangs bedingt.The invention is therefore based on the object of further developing a device for hot-dip coating of metal strands of the type mentioned at the outset in such a way that the disadvantages mentioned are overcome. In particular, an electromagnetic inductor should therefore be designed which has a low overall height and nevertheless does not cause the metal strand to heat up excessively.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass der Induktor mit elektrischen Versorgungsmitteln in Verbindung steht, die diesen mit einem Wechselstrom versorgen, dessen Frequenz kleiner als 500 Hz ist; bevorzugt ist vorgesehen, dass die Frequenz kleiner als 100 Hz, insbesondere 50 Hz (Netz- frequenz), ist.This object is achieved in that the inductor is connected to electrical supply means which supply it with an alternating current, the frequency of which is less than 500 Hz; it is preferably provided that the frequency is less than 100 Hz, in particular 50 Hz (mains frequency).
Mit dieser Ausgestaltung ist es möglich, die Erwärmung des durchlaufenden Metallstranges erheblich zu reduzieren, verglichen mit der vorbekannten Lösung. Ferner fällt die mittige Führung des Metallstrangs im Führungskanal leichter, da die ferromagnetische Anziehung des Metallstranges an die Wände des Führungskanals wesentlich geringer ist als bei der vorbekannten Lösung. Durch das gewählte Baukonzept ergibt sich daher die angestrebte geringe Bauhöhe des Induktors.With this configuration, it is possible to considerably reduce the heating of the metal strand passing through, compared to the previously known solution. Furthermore, the central guidance of the metal strand in the guide channel is easier, since the ferromagnetic attraction of the metal strand to the walls of the guide channel is significantly less than in the previously known solution. The chosen construction concept therefore results in the desired low construction height of the inductor.
Gemäß einer Weiterbildung ist vorgesehen, dass die Versorgungsmittel den Induktor mit einphasigem Wechselstrom versorgen.According to a further development, it is provided that the supply means supply the inductor with single-phase alternating current.
Mit Vorteil weist der Induktor je eine Induktionsspule beidseits des Führungskanals auf.The inductor advantageously has an induction coil on each side of the guide channel.
Als besonders vorteilhaft hat es sich herausgestellt, wenn die Vorrichtung wei- terhin mit Führungsmitteln zur Führung des Metallstrangs im Führungskanal ausgestattet wird. Hierfür sind verschiedene Möglichkeiten denkbar.It has proven to be particularly advantageous if the device is further equipped with guide means for guiding the metal strand in the guide channel. Various options are conceivable for this.
Nach einer Ausgestaltung ist vorgesehen, dass die Führungsmittel mindestens ein Paar Führungsrollen sind. Diese werden bevorzugt im unteren Bereich des Führungskanals oder unter dem Führungskanal angeordnet.According to one embodiment, it is provided that the guide means are at least a pair of guide rollers. These are preferably arranged in the lower region of the guide channel or below the guide channel.
Gemäß einer alternativen (ggf. auch additiven) Ausführungsform ist vorgesehen, dass die Führungsmittel mindestens zwei Korrekturspulen zur Lageregelung des Metallstrangs im Führungskanal in Richtung normal zur Oberfläche des Metallstrangs umfassen. Dabei können die Korrekturspulen, in Bewegungsrichtung des Metallstrangs betrachtet, in derselben Höhe wie die Induktionsspulen angeordnet werden. Eine gute Wirksamkeit des Induktors ergibt sich, wenn der elektromagnetische Induktor für die Aufnahme der Induktionsspule und der Korrekturspule zwei Nuten aufweist, die parallel zueinander, senkrecht zur Bewegungsrichtung des Metallstrangs und senkrecht zur normalen Richtung verlaufen. Die Regelung des Metallstrangs im Führungskanal erleichtert sich, wenn die in den Nuten angeordnete Korrekturspule näher am Metallstrang angeordnet ist als die Induktionsspule. Die Regelung kann genauer erfolgen, wenn der Induktor beidseits des Metallstrangs je mindestens zwei in einer Rei- he nebeneinander angeordnete Korrekturspulen aufweist. Ferner können Mittel zum Versorgen der Korrekturspulen mit einem Wechselstrom vorgesehen werden, der dieselbe Phase aufweist wie derjenige Strom, mit dem die Induktionsspulen betrieben werden.According to an alternative (possibly also additive) embodiment it is provided that the guide means comprise at least two correction coils for position control of the metal strand in the guide channel in the direction normal to the surface of the metal strand. When viewed in the direction of movement of the metal strand, the correction coils can be arranged at the same height as the induction coils. The inductor is effective when the electromagnetic inductor for receiving the induction coil and the correction coil has two grooves which run parallel to one another, perpendicular to the direction of movement of the metal strand and perpendicular to the normal direction. The regulation of the metal strand in the guide channel is facilitated if the correction coil arranged in the slots is arranged closer to the metal strand than the induction coil. The regulation can take place more precisely if the inductor has at least two correction coils arranged next to one another on both sides of the metal strand. Furthermore, means can be provided for supplying the correction coils with an alternating current which has the same phase as the current with which the induction coils are operated.
Wird die Lageregelung des Metallstrangs im Führungskanal mittels der ge- nannten Korrekturspulen ins Auge gefasst, kann die Lage des durchlaufenden Stahlbandes durch Induktionsfeldsensoren erfasst werden, die mit einem schwachen Messfeld hoher Frequenz betrieben werden. Dazu wird eine höher- frequente Spannung mit geringer Leistung den Induktionsspulen überlagert. Die höherfrequente Spannung hat keinen Einfluss auf die Abdichtung; in gleicher Weise kommt es hierdurch zu keiner Aufheizung des Beschichtungsmetalls bzw. Stahlbands. Die höherfrequente Induktion lässt sich aus dem kräftigen Signal der normalen Abdichtung herausfiltern und liefert dann ein dem Abstand vom Sensor proportionales Signal. Mit diesem kann die Lage des Bandes im Führungskanal erfasst und geregelt werden.If the position control of the metal strand in the guide channel is considered by means of the so-called correction coils, the position of the steel strip passing through can be detected by induction field sensors which are operated with a weak measuring field of high frequency. For this purpose, a higher-frequency voltage with low power is superimposed on the induction coils. The higher frequency voltage has no influence on the seal; in the same way there is no heating of the coating metal or steel strip. The higher-frequency induction can be filtered out of the powerful signal of the normal seal and then delivers a signal proportional to the distance from the sensor. This enables the position of the belt in the guide channel to be recorded and regulated.
In der Zeichnung sind Ausführungsbeispiele der Erfindung dargestellt. Es zeigen:Exemplary embodiments of the invention are shown in the drawing. Show it:
Figur 1 schematisch ein Schmelztauch-Beschichtungsgefäß mit einem durch dieses hindurch geführten Metallstrang;Figure 1 schematically shows a hot-dip coating vessel with a metal strand passed through it;
Figur 2 schematisch den Schnitt durch den Führungskanal und die Induktoren mit darunter angeordneten Führungsrollen;Figure 2 shows schematically the section through the guide channel and the inductors with guide rollers arranged underneath;
Figur 3 eine zu Fig. 2 entsprechende Darstellung mit Führungsmittel in Form von Korrekturspulen; und3 shows a representation corresponding to FIG. 2 with guide means in the form of correction coils; and
Figur 4 die Ansicht eines Induktors gemäß Fig. 3, von der Seite betrachtet.4 shows the view of an inductor according to FIG. 3, viewed from the side.
In Figur 1 ist das Prinzip der Schmelztauch-Beschichtung eines Metallstrangs 1 , insbesondere eines Stahlbands, gezeigt. Der zu beschichtende Metallstrang 1 tritt vertikal von unten in den Führungskanal 4 der Beschichtungsanlage ein. Der Führungskanal 4 bildet das untere Ende eines Behälters 3, das mit flüssigem Beschichtungsmetall 2 gefüllt ist. Der Metallstrang 1 wird in Bewegungsrichtung X vertikal nach oben geführt. Damit das flüssige Beschichtungsmetall 2 nicht aus dem Behälter 3 auslaufen kann, ist im Bereich des Führungskanals 4 ein elektromagnetischer Induktor 5 angeordnet. Dieser besteht aus zwei Hälften 5a und 5b, von denen jeweils eine seitlich des Metallstrangs 1 angeordnet ist. Im elektromagnetischen Induktor 5 wird ein elektromagnetisches Sperrfeld erzeugt, das das flüssige Beschichtungsmetall 2 im Behälter 3 zurückhält und so am Auslaufen hindert.FIG. 1 shows the principle of hot-dip coating a metal strand 1, in particular a steel strip. The metal strand to be coated 1 enters the guide channel 4 of the coating system vertically from below. The guide channel 4 forms the lower end of a container 3 which is filled with liquid coating metal 2. The metal strand 1 is guided vertically upwards in the direction of movement X. So that the liquid coating metal 2 cannot run out of the container 3, an electromagnetic inductor 5 is arranged in the region of the guide channel 4. This consists of two halves 5a and 5b, one of which is arranged to the side of the metal strand 1. An electromagnetic blocking field is generated in the electromagnetic inductor 5, which retains the liquid coating metal 2 in the container 3 and thus prevents it from leaking.
Der Induktor 5 wird von einem elektrischen Versorgungsmittel 6 mit einphasigem Wechselstrom versorgt. Die Frequenz f des Wechselstroms liegt unter 500 Hz. Bevorzugt kommt Netzfrequenz, also 50 bzw. 60 Hz, zum Einsatz.The inductor 5 is supplied with a single-phase alternating current by an electrical supply means 6. The frequency f of the alternating current is below 500 Hz. Mains frequency, ie 50 or 60 Hz, is preferably used.
Der detailliertere Aufbau des Bereichs des Führungskanals 4 ist in Fig. 2 zu sehen. Der Induktor 5 (bzw. seine beiden Hälften 5a und 5b) weist Nuten 9 auf, in die eine Induktionsspule 7 eingesetzt ist, die mit dem Wechselstrom versorgt wird und damit das elektromagnetische Sperrfeld erzeugt. Sorge ist insbesondere dafür zu tragen, dass der Metallstrang 1 in Richtung N normal auf den Strang 1 möglichst mittig im Führungskanal 4 geführt wird.The more detailed structure of the area of the guide channel 4 can be seen in FIG. 2. The inductor 5 (or its two halves 5a and 5b) has grooves 9, into which an induction coil 7 is inserted, which is supplied with the alternating current and thus generates the electromagnetic blocking field. Particular care must be taken to ensure that the metal strand 1 is guided in the direction N normally onto the strand 1 as centrally as possible in the guide channel 4.
Da der Induktor 5 bzw. die Induktionsspule 7 im Betrieb einer gewisse ferromagnetische Anziehung zwischen Strang 1 und Wand des Führungskanals 4 bewirkt, sind Führungsmittel 8 vorgesehen, die in Fig. 2 als Führungsrollen 8a ausgebildet sind. Diese sind unter dem Führungskanal 4 angeordnet und stellen sicher, dass ein mittiges Einführen des Metallstrangs 1 in den Führungskanal 4 erfolgt.Since the inductor 5 or the induction coil 7 causes a certain ferromagnetic attraction between the strand 1 and the wall of the guide channel 4 during operation, guide means 8 are provided, which are formed in FIG. 2 as guide rollers 8a. These are arranged under the guide channel 4 and ensure that the metal strand 1 is inserted centrally into the guide channel 4.
Wie es in Fig. 3 gesehen werden kann, ist es auch möglich, die Führungsmittel 8 in anderer Weise auszubilden. Hiernach sind elektrische Korrekturspulen 8b vorgesehen, die ein geregeltes Magnetfeld erzeugen und so den Metallstrang 1 im Führungskanal 4 mittig halten. Wie gesehen werden kann, sind sowohl die Induktionsspulen 7 als auch die Korrekturspulen 8b in den Nuten 9 des Induktors 5a, 5b positioniert, und zwar auf der selben Höhe - in Bewegungsrichtung X betrachtet.As can be seen in FIG. 3, it is also possible to design the guide means 8 in a different way. According to this, electrical correction coils 8b are provided which generate a regulated magnetic field and thus the metal strand 1 Hold in the middle of the guide channel 4. As can be seen, both the induction coils 7 and the correction coils 8b are positioned in the grooves 9 of the inductor 5a, 5b, namely at the same height - viewed in the direction of movement X.
In Fig. 4 ist die seitliche Ansicht auf eine der beiden Induktorhälften 5b skizziert. Hier kann nochmals gesehen werden, dass sowohl die Induktionsspule 7 als auch die Korrekturspule 8b in den Nuten 9 des Induktors 5b untergebracht sind. Femer geht hieraus hervor, dass vorliegend drei nebeneinander angeordnete Korrekturspulen 8b', 8b" und 8b'" vorgesehen sind, die über die Breite des Me- tallstanges 1 auf diesen einwirken und ihn so mittig im Führungskanal 4 halten können.4 shows the side view of one of the two inductor halves 5b. Here it can be seen again that both the induction coil 7 and the correction coil 8b are accommodated in the grooves 9 of the inductor 5b. It also follows from this that three correction coils 8b ', 8b "and 8b'" are provided next to one another, which act on the metal rod 1 across the width and can thus hold it centrally in the guide channel 4.
Die Korrekturspulen 8b', 8b" und 8b"' werden mit der gleichen Strom-Phase angesteuert, die in der Induktionsspule 7 vorliegt, vor der die Korrekturspulen 8b', 8b", 8b"' angeordnet sind.The correction coils 8b ', 8b "and 8b"' are driven with the same current phase that is present in the induction coil 7, in front of which the correction coils 8b ', 8b ", 8b"' are arranged.
Es sei noch erwähnt, dass auch eine Kombination von Führungsrollen 8a (s. Fig. 2) und Korrekturspulen 8b (s. Fig. 3) vorgesehen werden kann. It should also be mentioned that a combination of guide rollers 8a (see FIG. 2) and correction coils 8b (see FIG. 3) can also be provided.
Bezuqszeichenliste:LIST OF REFERENCES:
1 Metallstrang (Stahlband)1 metal strand (steel band)
2 Beschichtungsmetall2 coating metal
3 Behälter3 containers
4 Führungskanal4 guide channel
5, 5a, 5b elektromagnetischer Induktor5, 5a, 5b electromagnetic inductor
6 elektrische Versorgungsmittel6 electrical supplies
7 Induktionsspule7 induction coil
8 Führungsmittel8 guide means
8a Führungsrolle8a leadership role
8b,8b
8b', 8b", 8b"' Korrekturspule8b ', 8b ", 8b"' correction coil
9 Nut9 groove
f Frequenzf frequency
X BewegungsrichtungX direction of movement
N normale Richtung N normal direction

Claims

Patentansprüche: claims:
1. Vorrichtung zur Schmelztauchbeschichtung von Metallsträngen (1), insbe- sondere von Stahlband, in der der Metallstrang (1) vertikal durch einen das geschmolzene Beschichtungsmetall (2) aufnehmenden Behälter (3) und durch einen vorgeschalteten Führungskanal (4) hindurchführbar ist, wobei im Bereich des Führungskanals (4) ein elektromagnetischer Induktor (5) angeordnet ist, der zum Zurückhalten des Beschichtungsmetalls (2) im Behälter (3) mittels eines elektromagnetischen Sperrfeldes im Beschichtungsmetall (2) Induktionsströme induzieren kann, die in Wechselwirkung mit dem elektromagnetischen Sperrfeld eine elektromagnetische Kraft ausüben, dadurch gekennzeichnet, daß der Induktor (5, 5a, 5b) mit elektrischen Versorgungsmitteln (6) in1. Device for hot-dip coating of metal strands (1), in particular steel strip, in which the metal strand (1) can be passed vertically through a container (3) holding the molten coating metal (2) and through an upstream guide channel (4) An electromagnetic inductor (5) is arranged in the area of the guide channel (4), which can induce induction currents in order to retain the coating metal (2) in the container (3) by means of an electromagnetic blocking field in the coating metal (2), which in interaction with the electromagnetic blocking field Exercise electromagnetic force, characterized in that the inductor (5, 5a, 5b) with electrical supply means (6) in
Verbindung steht, die diesen mit einem Wechselstrom versorgen, dessen Frequenz (f) kleiner als 500 Hz ist.Connection is established that supply it with an alternating current whose frequency (f) is less than 500 Hz.
2. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass die Frequenz (f) kleiner als 100 Hz, insbesondere 50 Hz, ist.2. Device according to claim 1, characterized in that the frequency (f) is less than 100 Hz, in particular 50 Hz.
3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Versorgungsmittel (6) den Induktor (5) mit einphasigem Wechselstrom versorgen.3. Device according to claim 1 or 2, characterized in that the supply means (6) supply the inductor (5) with single-phase alternating current.
4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Induktor (5) je eine Induktionsspule (7) beidseits des Führungskanals (4) aufweist. 4. Device according to one of claims 1 to 3, characterized in that the inductor (5) each has an induction coil (7) on both sides of the guide channel (4).
Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass sie Führungsmittel (8) zur Führung des Metallstrangs (1) im Führungskanal (4) aufweist. Device according to one of claims 1 to 4, characterized in that it has guide means (8) for guiding the metal strand (1) in the guide channel (4).
Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass die Führungsmittel (8) mindestens ein Paar Führungsrollen (8a) umfassen, die im unteren Bereich des Führungskanals (4) oder unter dem Führungskanal (4) angeordnet sind.Device according to claim 5, characterized in that the guide means (8) comprise at least a pair of guide rollers (8a) which are arranged in the lower region of the guide channel (4) or below the guide channel (4).
Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass die Führungsmittel (8) aus mindestens zwei Korrekturspulen (8b) zur Lageregelung des Metallstrangs (1) im Führungskanal (4) in Richtung (N) normal zur Oberfläche des Metallstrangs (1) bestehen.Apparatus according to claim 5, characterized in that the guide means (8) consist of at least two correction coils (8b) for position control of the metal strand (1) in the guide channel (4) in the direction (N) normal to the surface of the metal strand (1).
Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, dass die Korrekturspulen (8b), in Bewegungsrichtung (X) des Metallstrangs (1) betrachtet, in derselben Höhe wie die Induktionsspulen (7) angeordnet sind.Apparatus according to claim 7, characterized in that the correction coils (8b), viewed in the direction of movement (X) of the metal strand (1), are arranged at the same height as the induction coils (7).
Vorrichtung nach Anspruch 7 oder 8, dadurch gekennzeichnet, dass der elektromagnetische Induktor (5, 5a, 5b) für die Aufnahme der Induktionsspule (7) und der Korrekturspule (8b) zwei Nuten (9) aufweist, die parallel zueinander sowie senkrecht zur Bewegungsrichtung (X) des Metallstrangs (1) und senkrecht zur normalen Richtung (N) verlaufen. Device according to claim 7 or 8, characterized in that the electromagnetic inductor (5, 5a, 5b) for receiving the induction coil (7) and the correction coil (8b) has two grooves (9) which are parallel to one another and perpendicular to the direction of movement ( X) of the metal strand (1) and perpendicular to the normal direction (N).
10. Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, dass die in den Nuten (9) angeordnete Korrekturspule (8b) näher am Metallstrang (1) angeordnet ist als die Induktionsspule (7).10. The device according to claim 9, characterized in that the correction coil (8b) arranged in the grooves (9) is arranged closer to the metal strand (1) than the induction coil (7).
11. Vorrichtung nach einem der Ansprüche 7 bis 10, dadurch gekennzeichnet, dass der Induktor (5, 5a, 5b) beidseits des Metallstrangs (1) je mindestens zwei in einer Reihe nebeneinander angeordnete Korrekturspulen (8b1, 8b", 8b'") aufweist. 11. Device according to one of claims 7 to 10, characterized in that the inductor (5, 5a, 5b) on both sides of the metal strand (1) each have at least two correction coils (8b 1 , 8b ", 8b '") arranged next to one another in a row. having.
EP03743810A 2002-03-09 2003-02-20 Device for hot dip coating metal strands Expired - Lifetime EP1483423B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10210430A DE10210430A1 (en) 2002-03-09 2002-03-09 Device for hot dip coating of metal strands
DE10210430 2002-03-09
PCT/EP2003/001701 WO2003076680A1 (en) 2002-03-09 2003-02-20 Device for hot dip coating metal strands

Publications (2)

Publication Number Publication Date
EP1483423A1 true EP1483423A1 (en) 2004-12-08
EP1483423B1 EP1483423B1 (en) 2006-06-14

Family

ID=27762824

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03743810A Expired - Lifetime EP1483423B1 (en) 2002-03-09 2003-02-20 Device for hot dip coating metal strands

Country Status (15)

Country Link
US (1) US7361224B2 (en)
EP (1) EP1483423B1 (en)
JP (1) JP3973628B2 (en)
KR (1) KR100941624B1 (en)
CN (1) CN100374611C (en)
AT (1) ATE330041T1 (en)
AU (1) AU2003210316B2 (en)
BR (1) BR0307794A (en)
CA (1) CA2478487C (en)
DE (2) DE10210430A1 (en)
ES (1) ES2266840T3 (en)
MX (1) MXPA04008696A (en)
PL (1) PL202721B1 (en)
RU (1) RU2313617C2 (en)
WO (1) WO2003076680A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10255995A1 (en) * 2002-11-30 2004-06-09 Sms Demag Ag Device and method for hot-dip coating a metal strand
JP4518416B2 (en) * 2003-02-27 2010-08-04 エス・エム・エス・ジーマーク・アクチエンゲゼルシャフト Method and apparatus for hot dip coating of metal plate, especially steel plate
DE10312939A1 (en) * 2003-02-27 2004-09-09 Sms Demag Ag Method and device for hot-dip coating of metal strips, in particular steel strips
SE527507C2 (en) * 2004-07-13 2006-03-28 Abb Ab An apparatus and method for stabilizing a metallic article as well as a use of the apparatus
DE102005030766A1 (en) * 2005-07-01 2007-01-04 Sms Demag Ag Device for the hot dip coating of a metal strand
WO2015160326A1 (en) 2014-04-14 2015-10-22 Halliburton Energy Services, Inc. Wellbore line coating repair

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2316026A1 (en) * 1975-07-04 1977-01-28 Anvar ELECTROMAGNETIC DEVICE FOR CONTAINING LIQUID METALS
CH648500A5 (en) * 1980-07-11 1985-03-29 Concast Ag METHOD AND DEVICE FOR CONTINUOUSLY casting metal in a closed pouring system.
US4842170A (en) * 1987-07-06 1989-06-27 Westinghouse Electric Corp. Liquid metal electromagnetic flow control device incorporating a pumping action
FR2647814B1 (en) * 1989-06-02 1994-07-08 Galva Lorraine ENCLOSURE FOR USE IN COVERING METALLIC OR ALLOY-BASED COATING OF OBJECTS OF ELONGATE SHAPE THROUGHOUT IT
FR2700555B1 (en) * 1993-01-20 1995-03-31 Delot Process Sa Method for dimensioning a galvanizing enclosure provided with a device for magnetic wiping of galvanized metallurgical products.
DE4344939C1 (en) * 1993-12-23 1995-02-09 Mannesmann Ag Method for the control, suitable for the process, of an installation for coating strip-shaped material
US5464667A (en) * 1994-08-16 1995-11-07 Minnesota Mining And Manufacturing Company Jet plasma process and apparatus
US6106620A (en) * 1995-07-26 2000-08-22 Bhp Steel (Jla) Pty Ltd. Electro-magnetic plugging means for hot dip coating pot
DE19535854C2 (en) * 1995-09-18 1997-12-11 Mannesmann Ag Process for strip stabilization in a plant for coating strip-like material
US5765730A (en) * 1996-01-29 1998-06-16 American Iron And Steel Institute Electromagnetic valve for controlling the flow of molten, magnetic material
JPH1046311A (en) * 1996-07-26 1998-02-17 Nisshin Steel Co Ltd Hot dip coating device provided with electromagnetic sealing mechanism
CA2225537C (en) * 1996-12-27 2001-05-15 Mitsubishi Heavy Industries, Ltd. Hot dip coating apparatus and method
FR2797276A1 (en) * 1999-08-05 2001-02-09 Lorraine Laminage DEVICE AND METHOD FOR MONITORING THE CONTINUOUS COATING BY IMMERSION OF A METAL STRIP IN VERTICAL RECTILINE PATTERN
DE10014867A1 (en) * 2000-03-24 2001-09-27 Sms Demag Ag Process for the hot dip galvanizing of steel strips comprises continuously correcting the electrochemical field vertically to the surface of the strip to stabilize a middle
DE10210429A1 (en) * 2002-03-09 2003-09-18 Sms Demag Ag Device for hot dip coating of metal strands

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03076680A1 *

Also Published As

Publication number Publication date
DE10210430A1 (en) 2003-09-18
DE50303826D1 (en) 2006-07-27
ES2266840T3 (en) 2007-03-01
AU2003210316B2 (en) 2008-06-12
JP2005526180A (en) 2005-09-02
CN100374611C (en) 2008-03-12
BR0307794A (en) 2004-12-21
JP3973628B2 (en) 2007-09-12
KR100941624B1 (en) 2010-02-11
WO2003076680A1 (en) 2003-09-18
CA2478487C (en) 2010-11-09
EP1483423B1 (en) 2006-06-14
PL371544A1 (en) 2005-06-27
US7361224B2 (en) 2008-04-22
CA2478487A1 (en) 2003-09-18
KR20040091109A (en) 2004-10-27
AU2003210316A1 (en) 2003-09-22
PL202721B1 (en) 2009-07-31
RU2313617C2 (en) 2007-12-27
RU2004129779A (en) 2005-05-10
ATE330041T1 (en) 2006-07-15
MXPA04008696A (en) 2005-07-13
US20050172893A1 (en) 2005-08-11
CN1639378A (en) 2005-07-13

Similar Documents

Publication Publication Date Title
WO2006103050A1 (en) Method and device for the hot dip coating of a metal strip
DE2851494C2 (en)
WO1994013850A1 (en) Process and device for coating the surface of strip material
EP1483423B1 (en) Device for hot dip coating metal strands
EP1565590B1 (en) Method and device for hot-dip coating a metal strand
DE2548939C2 (en) Method and device for the continuous casting of strips
DE2850783A1 (en) METHOD FOR ADJUSTING THE THICKNESS OF A LIQUID METAL COATING ON A METAL SUBSTRATE AND DEVICE FOR CARRYING OUT SUCH A METAL
EP1483424B1 (en) Device for hot dip coating metal strands
DE2656524B2 (en) Process for one-sided coating of a metal strip with molten metal
DE19629026C2 (en) Process for winding an electrical steel strip into a large coil
DE3131353A1 (en) "METHOD AND DEVICE FOR SEALING THE GAP BETWEEN RELATIVELY MOVING DEVICES"
DE10208963A1 (en) Device for hot dip coating of metal strands
DE10254306A1 (en) Method and device for hot-dip coating a metal strand
DE961126C (en) Induction heating device for the production of longitudinally welded pipes
EP1563112B1 (en) Device for hot-dip coating a metal bar
EP1390551B1 (en) Method and device for heat treatment of metal strands, especially steel strips
DE2202764A1 (en) Coating thickness control - partic forming a zinc or tin coating of uniform thickness by subjecting the coated metal strip or bar to
DE10255995A1 (en) Device and method for hot-dip coating a metal strand
DE10215057B4 (en) Apparatus for hot-dip coating of metal strands and method therefor
WO2001071052A1 (en) Method and device for the hot-dip coating of metal lengths in particular steel strip
WO2004076707A1 (en) Method and device for melt dip coating metal strips, especially steel strips
WO2004090190A1 (en) Method and device for hot dip coating a metal strand
DE10254307A1 (en) Method and device for hot-dip coating a metal strand
EP1205572A1 (en) Process and apparatus for hot dip coating of metallic strip, especially steel strip
CH667023A5 (en) Method and device for casting of crystalline metallbaendern.

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20040731

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT SE SI SK TR

AX Request for extension of the european patent

Extension state: AL LT LV MK RO

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAC Information related to communication of intention to grant a patent modified

Free format text: ORIGINAL CODE: EPIDOSCIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT SE SI SK TR

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20060614

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060614

Ref country code: IE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060614

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060614

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: SE

Ref legal event code: TRGR

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REF Corresponds to:

Ref document number: 50303826

Country of ref document: DE

Date of ref document: 20060727

Kind code of ref document: P

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060914

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20061114

ET Fr: translation filed
GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 20061123

REG Reference to a national code

Ref country code: IE

Ref legal event code: FD4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070228

Ref country code: MC

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070228

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070228

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2266840

Country of ref document: ES

Kind code of ref document: T3

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20070315

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060915

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060914

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060614

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060614

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20061215

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SK

Payment date: 20100218

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 20100212

Year of fee payment: 8

Ref country code: TR

Payment date: 20100126

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20100729

Year of fee payment: 8

Ref country code: NL

Payment date: 20100813

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FI

Payment date: 20100812

Year of fee payment: 8

Ref country code: FR

Payment date: 20100824

Year of fee payment: 8

Ref country code: IT

Payment date: 20100730

Year of fee payment: 8

Ref country code: LU

Payment date: 20100812

Year of fee payment: 8

Ref country code: SE

Payment date: 20100812

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20100728

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 20100810

Year of fee payment: 8

BERE Be: lapsed

Owner name: *SMS DEMAG A.G.

Effective date: 20110228

REG Reference to a national code

Ref country code: NL

Ref legal event code: V1

Effective date: 20110901

REG Reference to a national code

Ref country code: SE

Ref legal event code: EUG

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20110220

REG Reference to a national code

Ref country code: SK

Ref legal event code: MM4A

Ref document number: E 734

Country of ref document: SK

Effective date: 20110220

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20111102

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110220

Ref country code: SK

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110220

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110228

Ref country code: FI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110220

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110220

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110901

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110220

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20120411

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110221

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20120221

Year of fee payment: 10

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110221

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110220

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110220

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 50303826

Country of ref document: DE

Effective date: 20130903

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130903