EP1563113B1 - Method and device for hot-dip coating a metal bar - Google Patents

Method and device for hot-dip coating a metal bar Download PDF

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Publication number
EP1563113B1
EP1563113B1 EP03811347A EP03811347A EP1563113B1 EP 1563113 B1 EP1563113 B1 EP 1563113B1 EP 03811347 A EP03811347 A EP 03811347A EP 03811347 A EP03811347 A EP 03811347A EP 1563113 B1 EP1563113 B1 EP 1563113B1
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EP
European Patent Office
Prior art keywords
container
metal
coating
molten coating
coating metal
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EP03811347A
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German (de)
French (fr)
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EP1563113A2 (en
Inventor
Bernhard Tenckhoff
Holger Behrens
Bodo Falkenhahn
Michael Zielenbach
Rolf Brisberger
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SMS Siemag AG
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SMS Demag AG
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    • 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
    • C23C2/003—Apparatus
    • C23C2/0034—Details related to elements immersed in bath
    • 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
    • C23C2/003—Apparatus
    • C23C2/0035—Means for continuously moving substrate through, into or out of the bath
    • 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
    • C23C2/003—Apparatus
    • C23C2/0036—Crucibles
    • C23C2/00361—Crucibles characterised by structures including means for immersing or extracting the substrate through confining wall area
    • C23C2/00362—Details related to seals, e.g. magnetic means
    • 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
    • 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
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • 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
    • C23C2/50—Controlling or regulating the coating processes
    • C23C2/52—Controlling or regulating the coating processes with means for measuring or sensing
    • C23C2/523—Bath level or amount

Definitions

  • the invention relates to a process for hot-dip coating a metal strand, in particular a steel strip, in which the metal strand is at least partially vertically passed through a container receiving the molten coating metal at a predetermined conveying speed. Furthermore, the invention relates to a device for hot dip coating of a metal strand.
  • the belts are introduced from above into the dip-coating bath in a plunger.
  • the coating metal is in liquid form and one desires to use gravity together with blowers to adjust the coating thickness, subsequent processes will contact the tape until complete solidification of the coating metal prohibit the tape in the coating vessel in the vertical direction must be deflected. This happens with a roller that runs in liquid metal. Due to the liquid coating metal, this roller is subject to heavy wear and is the cause of downtimes and thus failures in production.
  • Such a solution is for example from the EP 0 673 444 B1 known.
  • An electromagnetic closure for sealing the coating vessel down is also the solution according to the WO 96/03533 or the one according to the JP 5086446 one.
  • Hot-dip coating methods and associated apparatuses which use an electromagnetic closure in the bottom area of the coating vessel are furthermore known from US Pat EP 0 803 586 A1 , of the US 5,665,437 and from the DE 101 60 949 A1 known.
  • the invention is therefore based on the object, a method and an associated apparatus for hot dip coating a metal strand with which it is possible to efficiently influence the parameters of the hot-dip coating, without necessarily changing the flow rate of the metal strand through the molten coating metal.
  • the solution of this problem by the invention is procedurally characterized in that the conveying speed of the metal strand is kept substantially constant by the container and that the residence time of the metal strand in the molten coating metal by controlling or regulating the level of the level of the molten coating metal in the container is set, the metal strand is passed exclusively vertically through the molten coating metal and through a guide channel upstream of the container, and wherein an electromagnetic field is generated by means of at least two inductors arranged on both sides of the metal strand for retaining the coating metal in the container in the region of the guide channel.
  • the concept of the invention is based on the fact that the level of the level of the molten coating metal in the coating container is used for the targeted influencing of parameters which influence the quality of the hot dip coating process. With this procedure, it is possible to influence the coating quality without having to vary the conveying speed of the metal strand through the coating device.
  • the inventive apparatus for hot dip coating a metal strand in which the metal strand is at least partially passed vertically through the container receiving the molten coating metal is characterized by means for controlling the level of the level of the molten coating metal in the container as a function of a predetermined residence time of the metal strand in molten coating metal, wherein the means comprise measuring means for measuring the level of the molten coating metal in the container and means for influencing the level associated with a control or regulating device, and wherein the device comprises a guide channel upstream of the container and at least two on both sides of the Metallstranges arranged in the region of the guide channel inductors for generating an electromagnetic field for retaining the Be Schweizersmet alls in the container.
  • the means for influencing the level of the molten coating metal have a sequence for discharging molten coating metal from the container into a storage container and a pump for conveying molten coating metal from the storage container into the container.
  • the storage container is preferably arranged below the container.
  • the capacity of the container volume is many times smaller than that of the storage container; In this case, it is provided in particular that the capacity of the container is between 5 to 20% of that of the storage container.
  • FIG. 1 An embodiment of the invention is shown.
  • the single figure shows schematically a hot-dip coating device with a guided through this metal strand.
  • the device has a container 3 which is filled with molten coating metal 2. This may be, for example, zinc or aluminum.
  • molten coating metal 2 This may be, for example, zinc or aluminum.
  • To be coated metal strand 1 in the form of a steel strip passes through the container 3 in the conveying direction R vertically upward with a predetermined and constant in the process conveyor speed v.
  • the inductors 5 are two oppositely disposed alternating field or traveling field inductors, which are operated in the frequency range from 2 Hz to 10 kHz and establish an electromagnetic transverse field perpendicular to the conveying direction R.
  • the preferred frequency range for single-phase systems (AC field inductors) is between 2 kHz and 10 kHz, that for multi-phase systems (eg traveling field inductors) between 2 Hz and 2 kHz.
  • active action is taken on the level h of the molten coating metal 2 in the container 3 via suitable means and this is used specifically to influence the process parameters and thus the quality of the coating.
  • means 6 for controlling or regulating the height h of the water level are provided, it being apparent from the figure that the water level h can move within wide limits between a minimum water level h min and a maximum water level h max .
  • the means 6 for controlling or regulating the height h of the water level initially consist of a measuring means 7 with which the current water level h can be measured.
  • the measured by the measuring means 7 value is fed to a control or regulating device 10.
  • This also maintains the desired value of the residence time t of the metal strand 1 in the coating metal 2.
  • the control or regulating device 10 can influence means 8, 9 for influencing the water level h, in particular a discharge 8, with the molten coating metal 2 from the container 3 can be drained, as well as on a variable speed pump 9, can be pumped with the coating metal 2 in the container 3.
  • the desired or required level h can be controlled or regulated by the control or regulating device 10.
  • a storage container 11 is arranged below the container 3.
  • a pipe 12 connects the outlet 8 with the storage tank 11.
  • a pipe 13 is provided, in which the pump is arranged, can be pumped with the coating metal 2 from the storage tank 11 into the container 3.
  • the coating bath level is thus adjusted or regulated dynamically via the outlet 8 and the pump 9. This makes it possible to use the water level h as a control variable for quality control of the coated metal strand 1.
  • the associated change in the residence time t of the metal strand 1 in the coating metal 2-quality features of the metal strand 1 coated behind the coating device are set or readjusted-at a constant conveying speed v.

Abstract

The invention relates to a method for hot-dip coating a metal bar ( 1 ), particularly a steel strip, according to which at least some sections of the metal bar ( 1 ) are vertically directed through a container ( 3 ) receiving the molten coating metal ( 2 ) at a given conveying speed (v). In order to influence the quality of the coating process, the time (t) during which the metal bar ( 1 ) remains in the molten coating metal ( 2 ) is predefined by controlling or regulating the surface level (h) of the molten coating metal ( 2 ) in the container ( 3 ). The invention also relates to a device for hot-dip coating a metal bar.

Description

Die Erfindung betrifft ein Verfahren zur Schmelztauchbeschichtung eines Metallstranges, insbesondere eines Stahlbandes, bei dem der Metallstrang zumindest abschnittsweise vertikal durch einen das geschmolzene Beschichtungsmetall aufnehmenden Behälter mit vorgegebener Fördergeschwindigkeit hindurchgeführt wird. Des weiteren betrifft die Erfindung eine Vorrichtung zur Schmelztauchbeschichtung eines Metallstranges.The invention relates to a process for hot-dip coating a metal strand, in particular a steel strip, in which the metal strand is at least partially vertically passed through a container receiving the molten coating metal at a predetermined conveying speed. Furthermore, the invention relates to a device for hot dip coating of a metal strand.

Klassische 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 abrasiv entfernt werden, werden mit dem reduzierenden Wärmeprozess die Oberflächen so aktiviert, dass sie nach dem Wärmeprozess metallisch rein vorliegen.Conventional metal immersion 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 prior to coating and activated for connection to the coating metal. For this reason, the belt surfaces are treated in a reducing atmosphere prior to coating in heating processes. Since the oxide layers are previously removed chemically or abrasive, the reducing heat process activates the surfaces in such a way 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 strip surface but increases the affinity of these strip surfaces for the surrounding atmospheric oxygen. In order to prevent atmospheric oxygen from getting back to the belt surfaces before the coating process, the belts are introduced from above into the dip-coating bath in a plunger. However, since the coating metal is in liquid form and one desires to use gravity together with blowers to adjust the coating thickness, subsequent processes will contact the tape until complete solidification of the coating metal prohibit the tape in the coating vessel in the vertical direction must be deflected. This happens with a roller that runs in liquid metal. Due to the liquid coating metal, this roller 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 coating thickness of the coating metal, which can move in the micrometer range, high demands are placed on the quality of the strip surface. This means that the surfaces of the tape-guiding rollers also have to be of high quality. Disturbances on these surfaces generally lead to damage to the strip surface. This is another reason for frequent shutdowns of the plant.

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 einzusetzen. Es handelt sich hierbei um elektromagnetische Induktoren, die mit zurückdrängenden, pumpenden bzw. einschnürenden elektromagnetischen Wechsel- bzw. Wanderfeldern arbeiten, die das Beschichtungsgefäß nach unten abdichten.In order to avoid the problems associated with the rollers running in the liquid coating metal, there have been attempts to use a downwardly open coating vessel which has a guide channel for vertical tape feed-through in its lower portion and an electromagnetic shutter for sealing use. These are electromagnetic inducers that work with backward, pumping or constricting electromagnetic alternating or traveling fields 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 WO 96/03533 bzw. diejenige gemäß der JP 5086446 ein.Such a solution is for example from the EP 0 673 444 B1 known. An electromagnetic closure for sealing the coating vessel down is also the solution according to the WO 96/03533 or the one according to the JP 5086446 one.

Aus der DE 42 08 578 A1 ist ebenfalls eine Schmelztauchbeschichtungsanlage mit elektromagnetischem Verschluss bekannt. Für eine unabhängig von der Durchlaufgeschwindigkeit des Metallstranges steuerbare Verweildauer des Metallstranges im Beschichtungsmetall wird hier vorgesehen, dass während des Durchlaufs des Metallstranges das schmelzflüssige Überzugsmaterial in einer gegen die Oberfläche des Metallstranges gerichteten Bewegung gehalten und unter Abschluss von Luft umgewälzt wird.From the DE 42 08 578 A1 is also known a hot-dip coating system with electromagnetic closure. For an independently of the passage speed of the metal strand controllable residence time of the metal strand in the coating metal is provided here that during the passage of the metal strand, the molten coating material is held in a directed against the surface of the metal strand movement and circulated with the completion of air.

Alle genannten Lösungen stellen dabei darauf ab, dass grundsätzlich eine vorgegebene Pegelhöhe des Beschichtungsmetalls im Beschichtungsbehälter angestrebt wird. In der Regel wird die Durchlaufgeschwindigkeit des Metallstranges durch das Beschichtungsbad als wesentlicher Einflussparameter auf die Art und Qualität der Schmelztauchbeschichtung herangezogen. Abgesehen von der in der DE 42 08 578 A1 offenbarten Lösung besteht darüber hinaus zumeist keine Möglichkeit, aktiv auf den Schmelztauchbeschichtungsprozess Einfluss zu nehmen. D. h. die Verweilzeit des Metallstranges im Beschichtungsmedium wird bei bekannten Schmelztauchbeschichtungsverfahren dynamisch zumeist über die Durchlaufgeschwindigkeit des Metallstranges durch den Beschichtungsbehälter verändert, da der Beschichtungsbad-Pegel nur äußerst träge über den Beschichtungsaustrag am Metallstrang reduzierbar ist. Das Beschichtungsbadniveau kann insoweit also nicht als dynamisches Stellglied zur Einstellung von Qualitätsmerkmalen verwendet werden.All these solutions are based on the fact that in principle a predetermined level level of the coating metal in the coating container is desired. As a rule, the throughput speed of the metal strand through the coating bath is used as an important influencing parameter on the type and quality of the hot-dip coating. Apart from in the DE 42 08 578 A1 In addition, the solution disclosed usually has no possibility of actively influencing the hot dip coating process. Ie. The residence time of the metal strand in the coating medium is changed dynamically in most known hot dip coating processes mostly via the flow rate of the metal strand through the coating container, since the coating bath level can only be reduced extremely sluggishly over the coating discharge on the metal strand. The Beschichtungsbadniveau so far can not be used as a dynamic actuator for setting quality characteristics.

Verfahren zum Beschichten eines Trägerbandes mit Silikon für Solarzellen bzw. für Halbleiteranwendungen sind aus der US 4,577,588 und aus der US 4,762,687 bekannt.Processes for coating a carrier tape with silicone for solar cells or for semiconductor applications are known from US 4,577,588 and from the US 4,762,687 known.

Schmelztauchbeschichtungsverfahren und zugehörige Vorrichtungen, die einen elektromagnetischen Verschluss im Bodenbereich des Beschichtungsgefäßes einsetzen, sind weiterhin aus der EP 0 803 586 A1 , der US 5,665,437 und aus der DE 101 60 949 A1 bekannt.Hot-dip coating methods and associated apparatuses which use an electromagnetic closure in the bottom area of the coating vessel are furthermore known from US Pat EP 0 803 586 A1 , of the US 5,665,437 and from the DE 101 60 949 A1 known.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren und eine zugehörige Vorrichtung zum Schmelztauchbeschichten eines Metallstranges zu schaffen, mit dem bzw. mit der es möglich ist, eine effiziente Beeinflussung der Parameter der Schmelztauchbeschichtung vorzunehmen, ohne notwendiger Weise die Durchlaufgeschwindigkeit des Metallstranges durch das geschmolzene Beschichtungsmetall zu verändern.The invention is therefore based on the object, a method and an associated apparatus for hot dip coating a metal strand with which it is possible to efficiently influence the parameters of the hot-dip coating, without necessarily changing the flow rate of the metal strand through the molten coating metal.

Die Lösung dieser Aufgabe durch die Erfindung ist verfahrensgemäß dadurch gekennzeichnet, dass die Fördergeschwindigkeit des Metallstranges durch den Behälter weitgehend konstant gehalten wird und dass die Verweilzeit des Metallstranges im geschmolzenen Beschichtungsmetall durch Steuerung oder Regelung der Höhe des Pegelstandes des geschmolzenen Beschichtungsmetalls im Behälter vorgegeben wird, wobei der Metallstrang ausschließlich vertikal durch das geschmolzene Beschichtungsmetall und durch einen dem Behälter vorgeschalteten Führungskanal hindurchgeführt wird und wobei zum Zurückhalten des Beschichtungsmetalls im Behälter im Bereich des Führungskanals ein elektromagnetisches Feld mittels mindestens zwei beiderseits des Metallstranges angeordneter Induktoren erzeugt wird.The solution of this problem by the invention is procedurally characterized in that the conveying speed of the metal strand is kept substantially constant by the container and that the residence time of the metal strand in the molten coating metal by controlling or regulating the level of the level of the molten coating metal in the container is set, the metal strand is passed exclusively vertically through the molten coating metal and through a guide channel upstream of the container, and wherein an electromagnetic field is generated by means of at least two inductors arranged on both sides of the metal strand for retaining the coating metal in the container in the region of the guide channel.

Das Erfindungskonzept stellt also darauf ab, dass zur gezielten Beeinflussung von Parametern, die die Qualität des Schmelztauchbeschichtungsprozesses beeinflussen, die Höhe des Pegelstandes des geschmolzenen Beschichtungsmetalls im Beschichtungsbehälter herangezogen wird. Mit dieser Vorgehensweise ist es möglich, auf die Beschichtungsqualität Einfluss zu nehmen, ohne dass die Fördergeschwindigkeit des Metallstranges durch die Beschichtungsvorrichtung variiert werden muss.Thus, the concept of the invention is based on the fact that the level of the level of the molten coating metal in the coating container is used for the targeted influencing of parameters which influence the quality of the hot dip coating process. With this procedure, it is possible to influence the coating quality without having to vary the conveying speed of the metal strand through the coating device.

Dabei wird das an sich bekannte CVGL-Verfahren (Continuous Vertical Galvanising Line) mit elektromagnetischem Bodenverschluss eingesetzt.Here, the known per se CVGL method (Continuous Vertical Galvanizing Line) is used with electromagnetic bottom closure.

Die erfindungsgemäße Vorrichtung zur Schmelztauchbeschichtung eines Metallstranges, in der der Metallstrang zumindest abschnittsweise vertikal durch den das geschmolzene Beschichtungsmetall aufnehmenden Behälter hindurchgeführt wird, ist gekennzeichnet durch Mittel zur Steuerung oder Regelung der Höhe des Pegelstandes des geschmolzenen Beschichtungsmetalls im Behälter in Abhängigkeit einer vorgegebenen Verweilzeit des Metallstranges im geschmolzenen Beschichtungsmetall, wobei die Mittel Messmittel zur Messung des Pegelstandes des geschmolzenen Beschichtungsmetalls im Behälter und Mittel zur Beeinflussung des Pegelstandes aufweisen, die mit einer Steuerungs- oder Regelungseinrichtung in Verbindung stehen, und wobei die Vorrichtung einen dem Behälter vorgeschalteten Führungskanal aufweist sowie mindestens zwei beiderseits des Metallstranges im Bereich des Führungskanals angeordnete Induktoren zur Erzeugung eines elektromagnetischen Feldes zum Zurückhalten des Beschichtungsmetalls im Behälter.The inventive apparatus for hot dip coating a metal strand in which the metal strand is at least partially passed vertically through the container receiving the molten coating metal is characterized by means for controlling the level of the level of the molten coating metal in the container as a function of a predetermined residence time of the metal strand in molten coating metal, wherein the means comprise measuring means for measuring the level of the molten coating metal in the container and means for influencing the level associated with a control or regulating device, and wherein the device comprises a guide channel upstream of the container and at least two on both sides of the Metallstranges arranged in the region of the guide channel inductors for generating an electromagnetic field for retaining the Beschichtungsmet alls in the container.

Ferner kann vorgesehen werden, dass die Mittel zur Beeinflussung des Pegelstandes des geschmolzenen Beschichtungsmetalls einen Ablauf zum Ablassen von geschmolzenem Beschichtungsmetall aus dem Behälter in einen Vorlagebehälter sowie eine Pumpe zum Fördern von geschmolzenem Beschichtungsmetall vom Vorlagebehälter in den Behälter aufweisen. Dabei ist der Vorlagebehälter vorzugsweise unterhalb des Behälters angeordnet.Furthermore, it can be provided that the means for influencing the level of the molten coating metal have a sequence for discharging molten coating metal from the container into a storage container and a pump for conveying molten coating metal from the storage container into the container. In this case, the storage container is preferably arranged below the container.

Zur möglichst effizienten und schnellen Beeinflussung des Pegelstandes des geschmolzenen Beschichtungsmetalls im Behälter hat es sich bewährt, dass das Fassungsvolumen des Behälters um ein Vielfaches kleiner ist als dasjenige des Vorlagebehälters; hierbei ist insbesondere vorgesehen, dass das Fassungsvolumen des Behälters zwischen 5 bis 20 % desjenigen des Vorlagebehälters beträgt.For the most efficient and rapid influencing of the level of the molten coating metal in the container, it has been proven that the capacity of the container volume is many times smaller than that of the storage container; In this case, it is provided in particular that the capacity of the container is between 5 to 20% of that of the storage container.

In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. Die einzige Figur zeigt schematisch eine Schmelztauch-Beschichtungsvorrichtung mit einem durch diese hindurch geführten Metallstrang.In the drawing, an embodiment of the invention is shown. The single figure shows schematically a hot-dip coating device with a guided through this metal strand.

Die Vorrichtung weist einen Behälter 3 auf, der mit schmelzflüssigem Beschichtungsmetall 2 gefüllt ist. Bei diesem kann es sich beispielsweise um Zink oder Aluminium handeln. Der zu beschichtende Metallstrang 1 in Form eines Stahlbandes passiert den Behälter 3 in Förderrichtung R vertikal nach oben mit einer vorgegebenen und im Prozess konstant gehaltenen Fördergeschwindigkeit v.The device has a container 3 which is filled with molten coating metal 2. This may be, for example, zinc or aluminum. To be coated metal strand 1 in the form of a steel strip passes through the container 3 in the conveying direction R vertically upward with a predetermined and constant in the process conveyor speed v.

Es sei an dieser Stelle angemerkt, dass es grundsätzlich auch möglich ist, dass der Metallstrang 1 den Behälter 3 von oben nach unten passiert.It should be noted at this point that it is also possible in principle that the metal strand 1, the container 3 passes from top to bottom.

Zum Durchtritt des Metallstranges 1 durch den Behälter 3 ist dieser im Bodenbereich geöffnet; hier befindet sich ein Führungskanal 4. Damit das schmelzflüssige Beschichtungsmetall 2 nicht durch den Führungskanal 4 nach unten abfließen kann, befinden sich beiderseits des Metallstranges 1 zwei elektromagnetische Induktoren 5, die ein magnetisches Feld erzeugen, das Volumenkräfte im flüssigken Metall hervorruft, die der Schwerkraft des Beschichtungsmetalls 2 entgegenwirkt und damit den Führungskanal 4 nach unten hin abdichtet.For the passage of the metal strand 1 through the container 3, this is open in the bottom area; Here is a guide channel 4. So that the molten coating metal 2 can not drain down through the guide channel 4, located on both sides of the metal strand 1, two electromagnetic inductors 5, which generate a magnetic field, the volume forces in the liquid-metal causes the gravity of the Coating metal 2 counteracts and thus seals the guide channel 4 downwards.

Bei den Induktoren 5 handelt es sich um zwei gegenüber angeordnete Wechselfeld- oder Wanderfeldinduktoren, die im Frequenzbereich von 2 Hz bis 10 kHz betrieben werden und ein elektromagnetisches Querfeld senkrecht zur Förderrichtung R aufbauen. Der bevorzugte Frequenzbereich für einphasige Systeme (Wechselfeldinduktoren) liegt zwischen 2 kHz und 10 kHz, der für mehrphasige Systeme (z. B. Wanderfeldinduktoren) zwischen 2 Hz und 2 kHz.The inductors 5 are two oppositely disposed alternating field or traveling field inductors, which are operated in the frequency range from 2 Hz to 10 kHz and establish an electromagnetic transverse field perpendicular to the conveying direction R. The preferred frequency range for single-phase systems (AC field inductors) is between 2 kHz and 10 kHz, that for multi-phase systems (eg traveling field inductors) between 2 Hz and 2 kHz.

Bei der vorgeschlagenen Schmelztauchbeschichtungsvorrichtung wird über geeignete Mittel aktiv auf den Pegelstand h des geschmolzenen Beschichtungsmetalls 2 im Behälter 3 Einfluss genommen und dieser gezielt zur Beeinflussung der Prozessparameter und damit der Qualität der Beschichtung herangezogen.In the proposed hot-dip coating apparatus, active action is taken on the level h of the molten coating metal 2 in the container 3 via suitable means and this is used specifically to influence the process parameters and thus the quality of the coating.

Hierzu sind Mittel 6 zur Steuerung oder Regelung der Höhe h des Pegelstandes vorgesehen, wobei der Figur zu entnehmen ist, dass sich der Pegelstand h in weiten Grenzen zwischen einem minimalen Pegelstand hmin und einem maximalen Pegelstand hmax bewegen kann.For this purpose, means 6 for controlling or regulating the height h of the water level are provided, it being apparent from the figure that the water level h can move within wide limits between a minimum water level h min and a maximum water level h max .

Über die aktuelle Höhe h des Pegelstandes im Behälter 3 sowie die Fördergeschwindigkeit v des Metallstranges 1 ergibt sich die Verweilzeit t des Metallstranges 1 im Beschichtungsmetall 2; hieraus wiederum ergeben sich wichtige Einflussparameter für den Schmelztauchbeschichtungsprozess.About the current height h of the water level in the container 3 and the conveying speed v of the metal strand 1 results in the residence time t of the metal strand 1 in the coating metal 2; This in turn results in important influencing parameters for the hot dip coating process.

Die Mittel 6 zur Steuerung oder Regelung der Höhe h des Pegelstandes bestehen zunächst aus einem Messmittel 7, mit dem der aktuelle Pegelstand h gemessen werden kann. Der vom Messmittel 7 gemessene Wert wird einer Steuerung- oder Regelungseinrichtung 10 zugeleitet. Diese erhält auch den gewünschten Wert der Verweilzeit t des Metallstranges 1 im Beschichtungsmetall 2. Die Steuerung- oder Regelungseinrichtung 10 kann auf Mittel 8, 9 zur Beeinflussung des Pegelstandes h Einfluss nehmen, namentlich auf einen Ablauf 8, mit dem schmelzflüssiges Beschichtungsmetall 2 aus dem Behälter 3 abgelassen werden kann, sowie auf eine drehzahlgeregelte Pumpe 9, mit der Beschichtungsmetall 2 in den Behälter 3 gepumpt werden kann. Durch entsprechende Einflussnahme auf den Zulauf bzw. Ablauf von Beschichtungsmetall 2 in den bzw. aus dem Behälter 3 kann der gewünschte bzw. benötigte Pegelstand h durch die Steuerungs- oder Regelungseinrichtung 10 gesteuert bzw. geregelt eingehalten werden.The means 6 for controlling or regulating the height h of the water level initially consist of a measuring means 7 with which the current water level h can be measured. The measured by the measuring means 7 value is fed to a control or regulating device 10. This also maintains the desired value of the residence time t of the metal strand 1 in the coating metal 2. The control or regulating device 10 can influence means 8, 9 for influencing the water level h, in particular a discharge 8, with the molten coating metal 2 from the container 3 can be drained, as well as on a variable speed pump 9, can be pumped with the coating metal 2 in the container 3. By appropriate influence on the inflow or outflow of coating metal 2 into or out of the container 3, the desired or required level h can be controlled or regulated by the control or regulating device 10.

Besonders vorteilhaft ist es, wenn hierzu unter dem Behälter 3 ein Vorlagebehälter 11 angeordnet ist. Wie im Ausführungsbeispiel gesehen werden kann, verbindet eine Rohrleitung 12 den Ablauf 8 mit dem Vorlagebehälter 11. In gleicher Weise ist eine Rohleitung 13 vorgesehen, in der die Pumpe angeordnet ist, mit der Beschichtungsmetall 2 vom Vorlagebehälter 11 in den Behälter 3 gepumpt werden kann.It is particularly advantageous if, for this purpose, a storage container 11 is arranged below the container 3. As can be seen in the embodiment, a pipe 12 connects the outlet 8 with the storage tank 11. In the same way, a pipe 13 is provided, in which the pump is arranged, can be pumped with the coating metal 2 from the storage tank 11 into the container 3.

Das Beschichtungsbadniveau wird also über den Ablauf 8 und die Pumpe 9 dynamisch eingestellt bzw. geregelt. Damit ist es möglich, den Pegelstand h als Stellgröße zur Qualitätsregelung des beschichteten Metallstranges 1 einzusetzen.The coating bath level is thus adjusted or regulated dynamically via the outlet 8 and the pump 9. This makes it possible to use the water level h as a control variable for quality control of the coated metal strand 1.

Durch eine gezielte Veränderung des Beschichtungsbadniveaus h werden über die damit einher gehende Veränderung der Verweilzeit t des Metallstranges 1 im Beschichtungsmetall 2 - bei konstanter Fördergeschwindigkeit v - Qualitätsmerkmale des hinter der Beschichtungsvorrichtung beschichtet vorliegenden Metallstranges 1 eingestellt bzw. nachgeregelt.By a specific change in the coating bath level h, the associated change in the residence time t of the metal strand 1 in the coating metal 2-quality features of the metal strand 1 coated behind the coating device are set or readjusted-at a constant conveying speed v.

Bezugszeichenliste:LIST OF REFERENCE NUMBERS

11
Metallstrang (Stahlband)Metal strand (steel strip)
22
Beschichtungsmetallcoating metal
33
Behältercontainer
44
Führungskanalguide channel
55
Induktorinductor
66
Mittel zur Steuerung oder Regelung der Höhe des PegelstandesMeans for controlling or regulating the level of the water level
77
Messmittel zur Messung des PegelstandesMeasuring device for measuring the water level
88th
Mittel zur Beeinflussung des Pegelstandes, AblaufMeans for influencing the level, drain
99
Mittel zur Beeinflussung des Pegelstandes, PumpeMeans for influencing the water level, pump
1010
Steuerungs- oder RegelungseinrichtungControl or regulating device
1111
Vorlagebehälterstorage container
1212
Rohrleitungpipeline
1313
Rohrleitungpipeline
vv
Fördergeschwindigkeitconveyor speed
tt
Verweilzeitdwell
hH
Pegelstand des geschmolzenen Beschichtungsmetalls im BehälterLevel of the molten coating metal in the container
hmin h min
minimaler Pegelstandminimal water level
hmax h max
maximaler Pegelstandmaximum water level
RR
Förderrichtungconveying direction

Claims (6)

  1. Method of hot-dip coating of a metal strip (1), particularly a steel strip, in which the metal strip (1) is led at least in sections vertically through a container (3), which receives the molten coating metal (2), at a predetermined transport speed (v), characterised in that the transport speed (v) of the metal strip (1) through the container (3) is kept substantially constant and that the dwell time (t) of the metal strip (1) in the molten coating metal (2) is predetermined by control or regulation of the height (h) of the level of the molten coating metal (2) in the container (3), wherein the metal strip (1) is led exclusively vertically through the molten coating metal (2) and through a guide channel (4) upstream of the container (3) and wherein for retention of the coating metal (2) in the container (3) an electromagnetic field is generated in the region of the guide channel (4) by means of at least two inductors (5) arranged on either side of the metal strip (1).
  2. Device for hot-coating of a metal strip (1), particularly a steel strip, in which the metal strip (1) is led at least in sections vertically through a container (3) receiving the molten coating metal (2), characterised by means (6) for controlling or regulating the height (h) of the level of the molten coating metal (2) in the container (3) in dependence on a predetermined dwell time (t) of the metal strip (1) in the molten coating metal (2), wherein the means (6) comprise measuring means (7) for measuring the level (h) of the molten coating metal (2) in the container (3) and means (8, 9) for influencing the level (h), which are connected with a control or regulating device (10), and wherein the device comprises a guide channel (4), which is upstream of the container (3), as well as at least two inductors (5), which are arranged on either side of the metal strip (1) in the region of the guide channel (4), for producing an electromagnetic field for retention of the coating metal (2) in the container (3).
  3. Device according to claim 2, characterised in that the means (8, 9) for influencing the level (h) of the molten coating metal (2) comprises an outlet (8) for letting molten coating metal (2) out of the container (3) into a collecting container (11) as well as a pump (9) for conveying molten coating metal (2) from the collecting container (11) into the container (3).
  4. Device according to claim 3, characterised in that the collecting container (11) is arranged below the container (3).
  5. Device according to claim 3 or 4, characterised in that the holding volume of the container (3) is smaller than the holding volume of the collecting container (11) by a multiple.
  6. Device according to claim 5, characterised in that the holding volume of the container (3) is between 5 to 20% of the holding volume of the collecting container (11).
EP03811347A 2002-11-21 2003-10-06 Method and device for hot-dip coating a metal bar Expired - Lifetime EP1563113B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10254306 2002-11-21
DE10254306A DE10254306A1 (en) 2002-11-21 2002-11-21 Method and device for hot-dip coating a metal strand
PCT/EP2003/011080 WO2004046412A2 (en) 2002-11-21 2003-10-06 Method and device for hot-dip coating a metal bar

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EP1563113A2 EP1563113A2 (en) 2005-08-17
EP1563113B1 true EP1563113B1 (en) 2008-02-27

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JP (1) JP4485955B2 (en)
KR (1) KR101090094B1 (en)
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AT (1) ATE387518T1 (en)
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ES (1) ES2298625T3 (en)
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PL (1) PL212670B1 (en)
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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
DE102005012296A1 (en) * 2005-03-17 2006-09-21 Sms Demag Ag Method and device for descaling a metal strip
US10233518B2 (en) * 2006-08-30 2019-03-19 Bluescope Steel Limited Metal-coated steel strip
RU2488644C2 (en) * 2011-10-25 2013-07-27 Александр Александрович Кулаковский Device for application of coating onto extended product
AT520084B1 (en) * 2017-10-03 2019-01-15 Primetals Technologies Austria GmbH Method for operating a cast-rolled composite plant and cast-rolled composite plant

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FR2556109B2 (en) * 1983-08-29 1986-09-12 Comp Generale Electricite DEVICE FOR CONTINUOUSLY DEPOSITING A POLYCRYSTALLINE SILICON LAYER ON A CARBON TAPE
FR2592064B1 (en) * 1985-12-23 1988-02-12 Elf Aquitaine DEVICE FOR FORMING A BATH OF MOLTEN SEMICONDUCTOR MATERIAL IN ORDER TO GROW A CRYSTALLINE ELEMENT THEREIN
DE4242380A1 (en) * 1992-12-08 1994-06-09 Mannesmann Ag Method and device for coating the surface of strand-like material
CN1163624C (en) * 1995-11-10 2004-08-25 川崎制铁株式会社 Method and apparatus for holding molten metal
CA2225537C (en) * 1996-12-27 2001-05-15 Mitsubishi Heavy Industries, Ltd. Hot dip coating apparatus and method
DE19758140A1 (en) * 1997-12-19 1999-07-08 Mannesmann Ag Process for producing composite metal products
DE10146791A1 (en) * 2001-09-20 2003-04-10 Sms Demag Ag Method and device for coating the surface of strand-like metallic material
DE10160949A1 (en) * 2001-12-12 2003-06-26 Sms Demag Ag System for coating the surface of a metal strip with a molten coating material comprises a coating cell having a channel formed as a coating channel through which the metal strip is guided and through which the molten coating material flows

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BR0316515A (en) 2005-10-04
WO2004046412A2 (en) 2004-06-03
RU2338809C2 (en) 2008-11-20
MXPA05005311A (en) 2005-08-16
CA2506389C (en) 2011-09-13
KR20050085016A (en) 2005-08-29
AU2003276069A1 (en) 2004-06-15
US20060153992A1 (en) 2006-07-13
MY139905A (en) 2009-11-30
BR0316515B1 (en) 2012-11-27
PL212670B1 (en) 2012-11-30
TW200408725A (en) 2004-06-01
ATE387518T1 (en) 2008-03-15
PL375258A1 (en) 2005-11-28
DE50309275D1 (en) 2008-04-10
DE10254306A1 (en) 2004-06-03
ES2298625T3 (en) 2008-05-16
JP4485955B2 (en) 2010-06-23
EP1563113A2 (en) 2005-08-17
CN100445416C (en) 2008-12-24
RU2005119289A (en) 2006-02-10
WO2004046412A3 (en) 2004-07-29
JP2006508240A (en) 2006-03-09
CN1729309A (en) 2006-02-01
KR101090094B1 (en) 2011-12-07

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