EP1478788B1 - Device for coating metal bars by hot dipping - Google Patents

Device for coating metal bars by hot dipping Download PDF

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Publication number
EP1478788B1
EP1478788B1 EP03702565A EP03702565A EP1478788B1 EP 1478788 B1 EP1478788 B1 EP 1478788B1 EP 03702565 A EP03702565 A EP 03702565A EP 03702565 A EP03702565 A EP 03702565A EP 1478788 B1 EP1478788 B1 EP 1478788B1
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EP
European Patent Office
Prior art keywords
metal
container
roller
inductor
coating
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Expired - Lifetime
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EP03702565A
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German (de)
French (fr)
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EP1478788A1 (en
Inventor
Hans-Georg Hartung
Walter Trakowski
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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
    • 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
    • C23C2/40—Plates; Strips

Definitions

  • the invention relates to a device for the hot dip coating of metal strands, in particular of steel strip, in which the metal strand at least in sections vertically through a molten coating metal receiving container is passed and in which the metal strand through at least one stored role is performed, the role or at least the axis of which passes through the side walls of the container and outside the container is mounted and wherein in the region of the side wall of the container a Sealant is arranged for sealing the coating material
  • Such a device has become known from JP 04 346 641 A.
  • a linear motor which exerts electromagnetic forces and on this way holds the coating material in containers.
  • the linear motor in this case has a substantially cylindrical outer contour, which is arranged in a sleeve with a cylindrical bore.
  • the tapes are in a plunger from above into the dip coating bath introduced. Since the coating metal is in liquid form and gravity, along with blowers for adjustment want to use the coating thickness, the subsequent processes, however a band touch until complete solidification of the coating metal prohibit the tape in the coating vessel in the vertical direction be redirected. This happens with a roll that is in liquid metal running. Due to the liquid coating metal, this role is subject to a strong Wear and is the cause of downtime and thus failures in production.
  • the invention is therefore based on the object, a device for hot dip coating of metal strands of the type mentioned in such a way, that the mentioned disadvantages are overcome.
  • an electromagnetic inductor as a sealant is in more advantageous Ensures that the device for dip coating a Metal strand optimal stabilization and guidance of the metal strand in the Coating ensures, however, however, an exact storage of Leadership or stabilizing roles with a long service life, since the storage no longer exposed to the aggressive dip.
  • the sealing effect of the inductor with which the coating metal in the dip tank is retained is optimized by that in the area of the side wall the container arranged portion of the roller or the roller axis has a paragraph designed as a round and the paragraph to the paragraph the role or the roller axis adjacent section of the inductor geometric is designed to complement this paragraph.
  • To achieve a largest possible blocking field may be in the area of the adjacent section of the Inductor can be arranged an electromagnetic coil.
  • the electromagnetic inductor is arranged close to the coating metal. This can be his magnetic field achieve the greatest possible sealing effect.
  • electromagnetic inductor Both a traveling field inductor and a blocking field inductor can be used come.
  • rollers are preferably made of ceramic material or they are coated with such material to achieve a high quality the coating process in the bathroom, the rollers should continue with a Rotary drive in connection; they are then driven.
  • the inventive concept is then used when the metal strand vertically through the container and through an upstream Guide channel is guided, wherein in the region of the guide channel at least one further electromagnetic inductor is arranged, which is the Prevent coating metal from flowing down out of the container.
  • the principle of the hot-dip coating is a Metal strand 1, in particular a steel strip shown.
  • the to be coated Metal strand 1 occurs in the embodiment vertically from below into a guide channel 12 of the coating system.
  • the guide channel 12 forms the lower end of a container 3 filled with liquid coating metal 2 is.
  • the metal strand 1 is guided vertically upward in the direction of movement X. So that the liquid coating metal 2 does not leak from the container 3 can, is in the region of the guide channel 12 is an electromagnetic inductor 13 arranged. This consists of two halves, one of which is laterally of the metal strand 1 is arranged.
  • In the electromagnetic inductor 13 is generates an electromagnetic traveling field or Sperrfeld that the liquid Coating metal 2 in the container 3 holds back and thus prevents it from leaking.
  • rollers 4 enforce the side walls 6 of the container 3 on both sides. At its two axial ends go the rollers. 4 in axle sections 5 (roller axle) over, which are stored in bearings 14 (rolling bearings) are. Since the storage outside of the container 3, ie outside the coating metal 2, it can be done very accurately and with little play; Furthermore, the storage has a long service life.
  • an electromagnetic inductor 7 with one or more electromagnetic Coils 11 is arranged in the region of the side wall 6 of the container 3 in the region of the side wall 6 of the container 3 .
  • the inductor 7 generates the coating metal 2 in the container 3 restrained electromagnetic field, wherein Both a traveling field and a blocking field can be used.
  • Both a traveling field and a blocking field can be used.
  • the Inductor 7 acts as a sealing arrangement.
  • an electromagnetic traveling field is used Commitment. Since the passage gap between the side wall 6 and roller 4 through the Precise storage of the roll 4 can be kept tight, the field strength of the inductor 7 for sealing be significantly lower than in the implementation of the belt through the bottom of the container 3 (see inductor 13 in Fig. 1 and 2) is required. The overall height of the inductor 7 can thus be reduced.
  • the pumping effect of the traveling field generates a flow in the feedthrough area the roller 4 through the side wall 6, the solidification of the coating metal 2 counteracts in the passage region of the roller 4 through the side wall 6. Furthermore, as can be seen in FIG. 3, the inductor 7 in the container 3 close to the coating metal 2 set.
  • FIG. 4 comes to magneto-hydrodynamic Sealing a constricting electromagnetic Sperrfeld used.
  • the blocking force of the magnetic field is then fully effective when the Field lines of the induction field generated by the electromagnetic coil 11 is, perpendicular to the discharge direction of the coating metal 2.
  • the ceramic coating of the roller 4 has in the embodiment a paragraph 9 in the form of a rounding off; the inductor 7 has in his adjoining section 10 is an adapted, d. H. complementary Geometry.
  • this section 10 of the inductor 7 is an electromagnetic Coil 11 is arranged.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating With Molten Metal (AREA)
  • Coating Apparatus (AREA)

Abstract

The invention relates to a device for coating metal bars ( 1 ), particularly steel strips, by hot dipping. At least some sections of the metal bar ( 1 ) are vertically guided through a container receiving the molten coating metal ( 2 ), said metal bar ( 1 ) being guided by at least one roller ( 4 ) which runs on bearings. In order to increase the service life of the roller bearings, the roller, or at least the axis ( 5 ) thereof, penetrates the side walls ( 6 ) of the container ( 3 ) and is mounted outside the container ( 3 ).

Description

Die Erfindung betrifft eine Vorrichtung zur Schmelztauchbeschichtung von Metallsträngen, insbesondere von Stahlband, in der der Metallstrang zumindest abschnittsweise vertikal durch einen das geschmolzene Beschichtungsmetall aufnehmenden Behälter hindurchführbar ist und bei der der Metallstrang durch mindestens eine gelagerte Rolle geführt wird, wobei die Rolle oder zumindest deren Achse die Seitenwände des Behälters durchtritt und außerhalb des Behälters gelagert ist und wobei im Bereich der Seitenwand des Behälters ein Dichtungsmittel zum Abdichten des Beschichtungsmaterials angeordnet istThe invention relates to a device for the hot dip coating of metal strands, in particular of steel strip, in which the metal strand at least in sections vertically through a molten coating metal receiving container is passed and in which the metal strand through at least one stored role is performed, the role or at least the axis of which passes through the side walls of the container and outside the container is mounted and wherein in the region of the side wall of the container a Sealant is arranged for sealing the coating material

Eine solche Vorrichtung ist durch die JP 04 346 641 A bekannt geworden. Zur Abdichtung der Durchtrittsöffnung der Rollenachse durch die Behälterwand wird dort ein Linearmotor eingesetzt, der elektromagnetische Kräfte ausübt und auf diese Art und Weise das Beschichtungsmaterial in Behälter zurückhält. Der Linearmotor wiest hierbei eine im wesentlichen zylindrische äußere Kontur auf, die in einer Buchse mit zylindrischer Bohrung angeordnet ist.Such a device has become known from JP 04 346 641 A. to Seal the passage opening of the roller axis through the container wall is There used a linear motor, which exerts electromagnetic forces and on this way holds the coating material in containers. The linear motor in this case has a substantially cylindrical outer contour, which is arranged in a sleeve with a cylindrical bore.

Übliche Metall-Tauchbaschichtungsanlagen für Metallbänder, wie sie beispielsweise in der EP 0 556 833 A1 beschrieben sind, weisen einen wartungsintensiven Teil auf, nämlich das Beschichtungsgefäß mit der darin befiridlichen 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.Usual metal Tauchbaschichtungsanlagen for metal bands, as for example in EP 0 556 833 A1, have a high-maintenance Part, namely the coating vessel with the equipment therein befïid. The surfaces of the metal strips to be coated must be before the Coating of oxide residues cleaned and for the connection with the coating metal to be activated. For this reason, the band surfaces before coating in heating processes in a reducing atmosphere treated. Since the oxide layers previously removed chemically or abrasive become, with the reducing heat process the surfaces are activated, 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 increases for the surrounding atmospheric oxygen. To prevent oxygen in the air get back to the belt surfaces before the coating process can, the tapes are in a plunger from above into the dip coating bath introduced. Since the coating metal is in liquid form and gravity, along with blowers for adjustment want to use the coating thickness, the subsequent processes, however a band touch until complete solidification of the coating metal prohibit the tape in the coating vessel in the vertical direction be redirected. This happens with a roll that is in liquid metal running. Due to the liquid coating metal, this role is subject to a strong Wear and is the cause of downtime and thus failures in production.

Durch die gewünschten geringen Auflagedicken des Beschichtungsmetalls, die sich im Mikrometerbereich bewegen, 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, the Moving in the micrometer range, high quality requirements placed the tape surface. This means that the surfaces of the high-quality tape-carrying reels. Disruptions to these Surfaces generally cause damage to the belt surface. This is another reason for frequent shutdowns of the plant.

Übliche 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 Legierungsschichten im Beschichtungsmetall. Dadurch tritt der Fall auf, dass zum einen die Höchstgeschwindigkeit generell begrenzt ist und sich zum anderen bestimmte Metallbänder nicht mit der für die Anlage möglichen Höchstgeschwindigkeit fahren lassen.Conventional dip coating systems also have limits in the coating speed on. These are the limit values for Operation of the wiper, to the cooling of the continuous metal strip and the heat process for setting alloy layers in the coating metal. As a result, the case arises that on the one hand the Maximum speed is generally limited and specific to the other Metal straps fail with the maximum speed possible for the system let drive.

Bei den Tauchbeschichtungsvorgängen 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 Beschictüungsgefäß abhängig. Aus diesem Grunde muss bei manchen Beschichtungsvorgängen das Beschichtungsmetall zwar flüssig gehalten werden, aber die Temperatur darf gleichwohl bestimmte Grenzwerte nicht überschreiten. Dies würde ansonsten dem gewünschten Effekt des Abstreifens des Beschichtungsmetalls zur Einstellung einer bestimmten Beschichtungsdicke entgegenlaufen, da mit fallender Temperatur die für den Abstreifvorgang erforderliche Viskosität des Beschichtungsmetalls ansteigt und damit den Abstreifvorgang erschwert.In the dip coating operations, alloying processes for the compound are found of the coating metal with the strip surface instead. The properties and thicknesses of the thereby forming alloy layers are strongly dependent on the temperature in the Beschichtüungsgefäß. For this reason For some coating operations, the coating metal must indeed be kept liquid, but the temperature may nevertheless certain Do not exceed limits. This would otherwise have the desired effect stripping the coating metal to set a particular Coating thickness run counter, since with decreasing temperature for the Stripping process required viscosity of the coating metal increases 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 einzusetzen. Es handelt sich hierbei um elektromagnetische Induktoren, die mit zurückdrängenden, pumpenden bzw. einschnürenden elektromagnetischen Wechsel- bzw. Wanderfeldem arbeiten, die das Beschichtungsgefäß nach unten abdichten.To avoid the problems associated with those in the liquid Coating metal rolling roles, there have been approaches to this to use a downwardly open coating vessel, in its lower Area a guide channel for vertical tape feedthrough upward and to use an electromagnetic closure for sealing. These are electromagnetic inducers with back-pushing, pumping or constricting electromagnetic alternating or Wanderfeldem work that seal the coating vessel down.

Derartige Lösungen sind beispielsweise aus der EP 0 673 444 B1, der DE 195 35 854 A1, der DE 100 14 867 A1, der WO 96/03533 A1, der EP 0 854 940 B1 und der JP 5086446 bekannt.Such solutions are known for example from EP 0 673 444 B1, DE 195 35 854 A1, DE 100 14 867 A1, WO 96/03533 A1, EP 0 854 940 B1 and JP 5086446.

Problematisch bleibt bei all diesen Lösungen, dass unter Umständen eine nur ungenügende Stabilisierung bzw. Führung des Metallstrangs im Beschichtungsbad vorliegt. Werden zur Beseitigung dieses Problems die beispielsweise aus der EP 0 556 833 A1 bekannten Rollen eingesetzt, tritt das Problem der geringen Standzeit der Rollenlagerung im aggressiven flüssigen Metallbad auf.The problem remains with all these solutions that may only one Insufficient stabilization or guidance of the metal strand in the coating bath is present. Be the elimination of this problem, for example used from EP 0 556 833 A1 known roles, the problem of low life of the roller bearing in aggressive liquid metal bath on.

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. The invention is therefore based on the object, a device for hot dip coating of metal strands of the type mentioned in such a way, that the mentioned disadvantages are overcome.

Diese Aufgabe wird erfindungsgemäß mit den im kennzeichnenden Teil des unabhängigen Anspruchs angegebenen Merkmalen gelöst.This object is achieved with the characterizing part of the invention independent claim specified characteristics solved.

Mit einem elektromagnetischen Induktor als Dichtungsmittel wird in vorteilhafter Weise sichergestellt, dass die Vorrichtung zur Tauchbadbeschichtung eines Metallstrangs eine optimale Stabilisierung und Führung des Metallstrangs im Beschichtungsbad gewährleistet, trotzdem jedoch eine exakte Lagerung der Führungs- bzw. Stabilisierungsrollen mit hoher Standzeit vorliegt, da die Lagerung nicht mehr dem aggressiven Tauchbad ausgesetzt ist.With an electromagnetic inductor as a sealant is in more advantageous Ensures that the device for dip coating a Metal strand optimal stabilization and guidance of the metal strand in the Coating ensures, however, however, an exact storage of Leadership or stabilizing roles with a long service life, since the storage no longer exposed to the aggressive dip.

Die Dichtwirkung des Induktors, mit der das Beschichtungsmetall im Tauchbehälter zurückgehalten wird, wird dadurch optimiert, dass der im Bereich der Seitenwand des Behälters angeordnete Abschnitt der Rolle bzw. der Rollenachse einen als Ausrundung ausgebildeten Absatz aufweist und der an den Absatz der Rolle bzw. der Rollenachse angrenzende Abschnitt des Induktors geometrisch komplementär zu diesem Absatz ausgebildet ist. Zur Erzielung eines größtmöglichen Sperrfeldes kann im Bereich des angrenzenden Abschnitts des Induktors eine elektromagnetische Spule angeordnet werden.The sealing effect of the inductor with which the coating metal in the dip tank is retained, is optimized by that in the area of the side wall the container arranged portion of the roller or the roller axis has a paragraph designed as a round and the paragraph to the paragraph the role or the roller axis adjacent section of the inductor geometric is designed to complement this paragraph. To achieve a largest possible blocking field may be in the area of the adjacent section of the Inductor can be arranged an electromagnetic coil.

Gemäß einer Weiterbildung ist vorgesehen, dass der elektromagnetische Induktor nahe am Beschichtungsmetall angeordnet ist. Damit kann sein Magnetfeld eine größtmögliche Dichtwirkung erzielen. Als elektromagnetischer Induktor kann sowohl ein Wanderfeld-Induktor als auch ein Sperrfeld-Induktor zum Einsatz kommen.According to a development it is provided that the electromagnetic inductor is arranged close to the coating metal. This can be his magnetic field achieve the greatest possible sealing effect. As electromagnetic inductor Both a traveling field inductor and a blocking field inductor can be used come.

Eine optimale Führung und Stabilisierung des Metallstrangs ergibt sich, wenn der Strang beidseitig durch je eine Rolle, insgesamt also durch zwei Rollen geführt wird. Die Rollen bestehen dabei bevorzugt aus keramischem Material bzw. sie sind mit solchem Material beschichtet Zur Erreichung einer hohen Qualität des Beschichtungsvorgangs im Bad sollten die Rollen weiterhin mit einem Drehantrieb in Verbindung stehen; sie sind dann also angetrieben.Optimum guidance and stabilization of the metal strand results when the strand is guided on both sides by one roller each, in total by two rollers becomes. The rollers are preferably made of ceramic material or they are coated with such material to achieve a high quality the coating process in the bathroom, the rollers should continue with a Rotary drive in connection; they are then driven.

Besonders bevorzugt kommt das Erfindungskonzept dann zur Anwendung, wenn der Metallstrang vertikal durch den Behälter und durch einen vorgeschalteten Führungskanal hindurchführbar ist, wobei im Bereich des Führungskanals mindestens ein weiterer elektromagnetischer Induktor angeordnet ist, der das Beschichtungsmetall davon abhält, nach unten aus dem Behälter auszufließen.Particularly preferably, the inventive concept is then used when the metal strand vertically through the container and through an upstream Guide channel is guided, wherein in the region of the guide channel at least one further electromagnetic inductor is arranged, which is the Prevent coating metal from flowing down out of the container.

In der Zeichnung sind Ausführungsbeispiele der Erfindung dargestellt.
Es zeigen:

Figur 1
schematisch ein Schmelztauch-Beschichtungsgefäß mit einem durch dieses hindurch geführten Metallstrang in der Vorderansicht,
Figur 2
die zu Fig. 1 zugehörige Seitenansicht,
Figur 3
eine erste Ausführungsform der Dichtungsmittel zwischen Rolle und Behälterwand und
Figur 4
eine zu Fig. 3 alternative Ausführungsform.
In the drawings, embodiments of the invention are shown.
Show it:
FIG. 1
schematically a hot-dip coating vessel with a guided through this metal strand in front view,
FIG. 2
the associated to Fig. 1 side view,
FIG. 3
a first embodiment of the sealant between the roll and the container wall and
FIG. 4
an alternative to Fig. 3 embodiment.

In den Figuren 1 und 2 ist das Prinzip der Schmelztauch-Beschichtung eines Metallstrangs 1, insbesondere eines Stahlbandes, gezeigt. Der zu beschichtende Metallstrang 1 tritt im Ausführungsbeispiel vertikal von unten in einen Führungskanal 12 der Beschichtungsanlage ein. Der Führungskanal 12 bildet das untere Ende eines Behälters 3, der 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 12 ein elektromagnetischer Induktor 13 angeordnet. Dieser besteht aus zwei Hälften, von denen jeweils eine seitlich des Metallstrangs 1 angeordnet ist. Im elektromagnetischen Induktor 13 wird ein elektromagnetisches Wanderfeld oder Sperrfeld erzeugt, das das flüssige Beschichtungsmetall 2 im Behälter 3 zurückhält und so am Auslaufen hindert.In FIGS. 1 and 2, the principle of the hot-dip coating is a Metal strand 1, in particular a steel strip shown. The to be coated Metal strand 1 occurs in the embodiment vertically from below into a guide channel 12 of the coating system. The guide channel 12 forms the lower end of a container 3 filled with liquid coating metal 2 is. The metal strand 1 is guided vertically upward in the direction of movement X. So that the liquid coating metal 2 does not leak from the container 3 can, is in the region of the guide channel 12 is an electromagnetic inductor 13 arranged. This consists of two halves, one of which is laterally of the metal strand 1 is arranged. In the electromagnetic inductor 13 is generates an electromagnetic traveling field or Sperrfeld that the liquid Coating metal 2 in the container 3 holds back and thus prevents it from leaking.

Zur guten Führung und Stabilisierung des Metallstrangs 1 sind im Behälter 3 des Beschichtungsmetalls 2 zwei Rollen 4 angeordnet, die oberhalb des Induktors 13 positioniert sind, also im flüssigen Beschichtungsmetall 2 laufen.For good guidance and stabilization of the metal strand 1 are in the container. 3 of the coating metal 2, two rollers 4 arranged above the inductor 13 are positioned, so run in the liquid coating metal 2.

Wie Fig. 2 entnommen werden kann, durchsetzen die Rollen 4 die Seitenwände 6 des Behälters 3 beidseitig. An ihren beiden axialen Enden gehen die Rollen 4 in Achsabschnitte 5 (Rollenachse) über, die in Lagern 14 (Wälzlagern) gelagert sind. Da die Lagerung außerhalb des Behälters 3, also außerhalb des Beschichtungsmetalls 2 erfolgt, kann sie sehr exakt und mit geringem Spiel erfolgen; ferner hat die Lagerung eine hohe Standzeit.As can be seen in Fig. 2, the rollers 4 enforce the side walls 6 of the container 3 on both sides. At its two axial ends go the rollers. 4 in axle sections 5 (roller axle) over, which are stored in bearings 14 (rolling bearings) are. Since the storage outside of the container 3, ie outside the coating metal 2, it can be done very accurately and with little play; Furthermore, the storage has a long service life.

Es sei angemerkt, dass natürlich das Konzept der Rollenanordnung und -lagerung genauso benutzt werden kann, wenn eine Umlenkung des Metallstrangs im Behälter 3 erfolgt, somit z.B. eine Ausgestaltung gemäß der EP 0 556 833 A1 beabsichtigt wird.It should be noted that, of course, the concept of roller arrangement and storage can be used as well, if a deflection of the metal strand in the container 3, thus e.g. an embodiment according to EP 0 556 833 A1 is intended.

Aufgrund der genauen spielarmen Lagerung der Rollen 4 in Lagern 14 außerhalb des Behälters 3 ist es möglich, die Differenz zwischen dem Durchmesser der Durchtrittsbohrung in der Behälterwand 6 und dem Durchmesser der Rolle 4 gering zu halten. Damit kann - im einfachsten Fall - bei entsprechend gering gehaltenem Spalt der Rollendurchführung ohne weitere Maßnahme das durch den Spalt ausfließende Beschichtungsmetall 2 in einem Auffangbehälter aufgenommen werden, so dass es gar keiner weiteren apparativen Voraussetzung bedarf, um das Beschichtungsverfahren durchzuführen. Es wäre dann lediglich zu beachten, dass der Bereich des ausfließenden Metalls unter Schutzgas gehalten wird, um Oxidation und die Bildung von unerwünschten Verunreinigungen des Beschichtungsmetalls zu vermeiden. Due to the exact low-play storage of the rollers 4 in bearings 14 outside of the container 3, it is possible the difference between the diameter the passage bore in the container wall 6 and the diameter of the roller 4 to keep low. This can - in the simplest case - at correspondingly low held gap of the roller bushing without further action by received the gap flowing coating metal 2 in a collecting container so that there is no further apparative requirement required to carry out the coating process. It would only be Note that the area of the outflowing metal is kept under protective gas is used to reduce oxidation and the formation of unwanted impurities of the coating metal to avoid.

Bevorzugt wird jedoch so vorgegangen, wie es in den Figuren 3 und 4 dargestellt ist:Preferably, however, the procedure is as shown in FIGS. 3 and 4 is:

In diesen Figuren ist zu sehen, dass im Bereich der Seitenwand 6 des Behälters 3 ein elektromagnetischer Induktor 7 mit einer oder mehreren elektromagnetischen Spulen 11 angeordnet ist. Der Induktor 7 erzeugt ein das Beschichtungsmetall 2 im Behälter 3 zurückhaltendes elektromagnetisches Feld, wobei sowohl ein Wanderfeld als auch ein Sperrfeld zum Einsatz kommen kann. Der Induktor 7 wirkt als Dichtungsanordnung.In these figures, it can be seen that in the region of the side wall 6 of the container 3 an electromagnetic inductor 7 with one or more electromagnetic Coils 11 is arranged. The inductor 7 generates the coating metal 2 in the container 3 restrained electromagnetic field, wherein Both a traveling field and a blocking field can be used. Of the Inductor 7 acts as a sealing arrangement.

Bei der Lösung gemäß Fig. 3 kommt ein elektromagnetisches Wanderfeld zum Einsatz. Da der Durchtrittsspalt zwischen Seitenwand 6 und Rolle 4 durch die präzise Lagerung der Rolle 4 eng gehalten werden kann, kann die Feldstärke des Induktors 7 zur Abdichtung deutlich geringer sein, als es bei der Durchführung des Bandes durch den Boden des Behälters 3 (s. Induktor 13 in Fig. 1 und 2) erforderlich ist. Die Bauhöhe des Induktors 7 läßt sich damit verringern. Der Pumpeffekt des Wanderfeldes erzeugt eine Strömung im Durchführungsbereich der Rolle 4 durch die Seitenwand 6, die einem Erstarren des Beschichtungsmetalls 2 im Durchtrittsbereich der Rolle 4 durch die Seitenwand 6 entgegenwirkt. Des weiteren ist - wie es Fig. 3 entnommen werden kann - der Induktor 7 im Behälter 3 nahe an das Beschichtungsmetall 2 herangesetzt.In the solution according to FIG. 3, an electromagnetic traveling field is used Commitment. Since the passage gap between the side wall 6 and roller 4 through the Precise storage of the roll 4 can be kept tight, the field strength of the inductor 7 for sealing be significantly lower than in the implementation of the belt through the bottom of the container 3 (see inductor 13 in Fig. 1 and 2) is required. The overall height of the inductor 7 can thus be reduced. Of the Pumping effect of the traveling field generates a flow in the feedthrough area the roller 4 through the side wall 6, the solidification of the coating metal 2 counteracts in the passage region of the roller 4 through the side wall 6. Furthermore, as can be seen in FIG. 3, the inductor 7 in the container 3 close to the coating metal 2 set.

Bei der Ausführungsform nach Fig. 4 kommt zur magneto-hydrodynamischen Abdichtung ein einschnürendes elektromagnetisches Sperrfeld zum Einsatz. Die sperrende Kraftwirkung des Magnetfeldes wird dann voll wirksam, wenn die Feldlinien des Induktionsfeldes, das von der elektromagnetischen Spule 11 erzeugt wird, senkrecht zur Abfließrichtung des Beschichtungsmetalls 2 liegen.In the embodiment of FIG. 4 comes to magneto-hydrodynamic Sealing a constricting electromagnetic Sperrfeld used. The blocking force of the magnetic field is then fully effective when the Field lines of the induction field generated by the electromagnetic coil 11 is, perpendicular to the discharge direction of the coating metal 2.

Daher ist hier für die Rolle 4 im Bereich ihres Abschnitts 8 eine besondere Form vorgesehen: Die keramische Beschichtung der Rolle 4 weist im Ausführungsbeispiel einen Absatz 9 in Form einer Ausrundung auf; der Induktor 7 hat in seinem hieran angrenzenden Abschnitt 10 eine angepasste, d. h. komplementäre Geometrie. In diesem Abschnitt 10 des Induktors 7 ist eine elektromagnetische Spule 11 angeordnet. Dadurch verlaufen die Feldlinien im Spalt zwischen Rolle 4 und Seitenwand 6 senkrecht zur Abfließrichtung des Beschichtungsmetalls 2 (s. Pfeile 15).Therefore, here is for the role 4 in the area of section 8 a special form provided: The ceramic coating of the roller 4 has in the embodiment a paragraph 9 in the form of a rounding off; the inductor 7 has in his adjoining section 10 is an adapted, d. H. complementary Geometry. In this section 10 of the inductor 7 is an electromagnetic Coil 11 is arranged. As a result, the field lines in the gap between roll run 4 and side wall 6 perpendicular to the direction of discharge of the coating metal. 2 (see arrows 15).

Es sei abschließend noch angemerkt, dass das vorgeschlagene Konzept der Anordnung einer Rolle in einem Beschichtungsbad nicht nur für Stabilisierungsrollen, sondern auch für Tauchrollen (z. B. zur Umlenkung des Metallstrangs) zur Anwendung kommen kann. It should finally be noted that the proposed concept of Arrangement of a roll in a coating bath not only for stabilizing rolls, but also for dipping rollers (eg for deflecting the metal strand) can be used.

Bezugszeichenliste:LIST OF REFERENCE NUMBERS

11
Metallstrangmetal strand
22
Beschichtungsmetallcoating metal
33
Behältercontainer
44
Führungsrolleleadership
55
Rollenachseroller axis
66
Seitenwand des Behälters 3Side wall of the container 3
77
Dichtungsmittel (Induktor)Sealant (inductor)
88th
Abschnitt der Führungsrolle 4Section of the guide roller 4
99
Absatz der Führungsrolle 4Sales of leadership 4
1010
Abschnitt des Induktors 7Section of the inductor 7
1111
elektromagnetische Spule des Induktors 7electromagnetic coil of the inductor 7
1212
Führungskanalguide channel
1313
Induktorinductor
1414
Wälzlagerroller bearing
1515
senkrechte Richtung zur Abfließrichtungvertical direction to the direction of discharge
XX
Bewegungsrichtungmovement direction

Claims (9)

  1. Device for hot-dip coating of metal strands (1), particularly of steel strip, in which the metal strand (1) can be vertically guided at least in sections through a container (3) receiving the molten coating metal (2) and in which the metal strand (1) is guided by at least one bearing-mounted roller (4), wherein the roller (4) or at least the axle (5) thereof penetrates the side walls (6) of the container (3) and is bearing-mounted outside the container (3) and wherein sealing means (7) for sealing off the coating material (2) is arranged in the region of the side wall (6) of the container (3), characterised in that the sealing means (7) are at least one electromagnetic inductor, wherein the section (8), which is arranged in the region of the side wall (6) of the container (3), of the roller (4) or of the roller axle (5) has an offset (9) formed as a radiussing and the section (10), which adjoins the offset (9) of the roller (4) or the roller axle (5), of the inductor (7) is formed to be geometrically complementary to the offset (9).
  2. Device according to claim 1, characterised in that at least one electromagnetic coil (11) is arranged in the region of the adjoining section (10) of the inductor (7).
  3. Device according to claim 1 or 2, characterised in that the electromagnetic inductor (7) is arranged near the coating metal (2).
  4. Device according to one of claims 1 to 3, characterised in that the electromagnetic inductor (7) is a travelling field inductor.
  5. Device according to one of claims 1 to 3, characterised in that the electromagnetic inductor (7) is a barrier field inductor.
  6. Device according to one of claims 1 to 5, characterised in that the metal strand (1) is guided at both sides by two rollers (4).
  7. Device according to one of claims 1 to 6, characterised in that the at least one roller (4) consists of ceramic material or is at least coated with such material.
  8. Device according to one of claims 1 to 7, characterised in that the at least one roller (4) is connected with a rotary drive.
  9. Device according to one of claims 1 to 8, characterised in that the metal strip (1) can be guided vertically through the container (3) and through an upstream guide channel (12), wherein at least one further electromagnetic inductor (13) is arranged in the region of the guide channel (12).
EP03702565A 2002-02-28 2003-01-30 Device for coating metal bars by hot dipping Expired - Lifetime EP1478788B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10208963 2002-02-28
DE10208963A DE10208963A1 (en) 2002-02-28 2002-02-28 Device for hot dip coating of metal strands
PCT/EP2003/000916 WO2003072843A1 (en) 2002-02-28 2003-01-30 Device for coating metal bars by hot dipping

Publications (2)

Publication Number Publication Date
EP1478788A1 EP1478788A1 (en) 2004-11-24
EP1478788B1 true EP1478788B1 (en) 2005-12-14

Family

ID=27740553

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Application Number Title Priority Date Filing Date
EP03702565A Expired - Lifetime EP1478788B1 (en) 2002-02-28 2003-01-30 Device for coating metal bars by hot dipping

Country Status (17)

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US (1) US7214272B2 (en)
EP (1) EP1478788B1 (en)
JP (1) JP2005528520A (en)
KR (1) KR20040089085A (en)
CN (1) CN100350067C (en)
AT (1) ATE312953T1 (en)
AU (1) AU2003205709A1 (en)
BR (1) BR0306500A (en)
CA (1) CA2477275A1 (en)
DE (2) DE10208963A1 (en)
ES (1) ES2253657T3 (en)
MX (1) MXPA04008250A (en)
PL (1) PL205282B1 (en)
RS (1) RS76004A (en)
RU (1) RU2299925C2 (en)
UA (1) UA79109C2 (en)
WO (1) WO2003072843A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2905955B1 (en) * 2006-09-18 2009-02-13 Vai Clecim Soc Par Actions Sim DEVICE FOR GUIDING A BAND IN A LIQUID BATH
TWI499692B (en) * 2013-06-17 2015-09-11 China Steel Corp For the use of steel plate hot dip bath immersed roller
EP3587613A1 (en) 2017-02-24 2020-01-01 JFE Steel Corporation Continuous molten metal plating apparatus and molten metal plating method using said apparatus
DE102017204465A1 (en) * 2017-03-17 2018-09-20 Sms Group Gmbh bearing arrangement
WO2018228662A1 (en) * 2017-06-12 2018-12-20 Thyssenkrupp Steel Europe Ag Nozzle for a hot-dip coating system

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55128569A (en) * 1979-03-26 1980-10-04 Nippon Kokan Kk <Nkk> Method and apparatus for hot galvanization
JPH0324254A (en) * 1989-06-22 1991-02-01 Kawasaki Steel Corp Hot-dip metal coating bath tank apparatus
US5252130A (en) * 1989-09-20 1993-10-12 Hitachi, Ltd. Apparatus which comes in contact with molten metal and composite member and sliding structure for use in the same
JPH04346641A (en) * 1991-05-23 1992-12-02 Kawasaki Steel Corp Structure for sealing continuous hot-dipping equipment
JP3084318B2 (en) * 1992-07-10 2000-09-04 第一高周波工業株式会社 Synchro for hot metal plating
DE4242380A1 (en) * 1992-12-08 1994-06-09 Mannesmann Ag Method and device for coating the surface of strand-like material
IN191638B (en) * 1994-07-28 2003-12-06 Bhp Steel Jla Pty Ltd
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

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DE10208963A1 (en) 2003-09-11
US7214272B2 (en) 2007-05-08
RS76004A (en) 2006-10-27
ES2253657T3 (en) 2006-06-01
RU2004128949A (en) 2005-04-10
WO2003072843A1 (en) 2003-09-04
PL205282B1 (en) 2010-03-31
ATE312953T1 (en) 2005-12-15
CA2477275A1 (en) 2003-09-04
US20050120950A1 (en) 2005-06-09
CN1639374A (en) 2005-07-13
AU2003205709A1 (en) 2003-09-09
BR0306500A (en) 2004-11-23
JP2005528520A (en) 2005-09-22
CN100350067C (en) 2007-11-21
UA79109C2 (en) 2007-05-25
RU2299925C2 (en) 2007-05-27
EP1478788A1 (en) 2004-11-24
DE50301921D1 (en) 2006-01-19
PL371497A1 (en) 2005-06-27
MXPA04008250A (en) 2005-07-13
KR20040089085A (en) 2004-10-20

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