EP1430162A1 - Method for hot-dip finishing - Google Patents

Method for hot-dip finishing

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Publication number
EP1430162A1
EP1430162A1 EP02800118A EP02800118A EP1430162A1 EP 1430162 A1 EP1430162 A1 EP 1430162A1 EP 02800118 A EP02800118 A EP 02800118A EP 02800118 A EP02800118 A EP 02800118A EP 1430162 A1 EP1430162 A1 EP 1430162A1
Authority
EP
European Patent Office
Prior art keywords
rotors
strip
container
coating
melt
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02800118A
Other languages
German (de)
French (fr)
Other versions
EP1430162B1 (en
Inventor
Rolf Brisberger
Walter Trakowski
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Siemag AG
Original Assignee
SMS Demag AG
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Filing date
Publication date
Application filed by SMS Demag AG filed Critical SMS Demag AG
Publication of EP1430162A1 publication Critical patent/EP1430162A1/en
Application granted granted Critical
Publication of EP1430162B1 publication Critical patent/EP1430162B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

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

Definitions

  • the invention relates to a method for coating the surface of, in particular, strip-shaped material, for example a non-ferrous metal strip or a steel strip with at least one metallic coating in the course of passing through at least one container holding the molten coating material.
  • the invention also relates to a device for carrying out the method.
  • process 1 The conventional hot-dip coating of strip (called process 1) with Zn, Zn-Al, Al or Al-Si alloys is described in the coating area in that the strip runs into the melt from an annealing furnace with the exclusion of air and by means of a different arrangement of non-driven rollers are deflected into the vertical and stabilized, cf. Figure 1. This applies to all coating metals / alloys listed for hot-dip coating.
  • a disadvantage of method 1 is that the rollers and bearings of the rollers are located in the melt and all materials are exposed to the chemical attack of the melt. The service life of all internals within the melt is limited. Furthermore, a large melting volume with a correspondingly large melting vessel is required in order to accommodate the rolls or the entire bathing equipment. 200 - 400 tons of liquid zinc are common for hot-dip galvanizing. Rapid regulation of the melt with regard to temperature and alloy composition is not possible due to the large volume. Larger fluctuations in the above parameters have to be accepted and may lead to qualitative losses, since alloying measures and the strip quality in the same vessel influence one another. Another disadvantage is that the production speed, particularly in the case of thin strips ⁇ 0.5 mm, cannot be increased in order to achieve an economical system output (approx. 180 m / min). One reason for this is that there is relative movement between the rollers in the bath and the belt. If the trains are raised to avoid this problem, there is a risk of a belt break. The result is the production of scrap and longer plant downtimes.
  • a further restriction for the maximum strip speed of a hot-dip galvanizing plant is given by the nozzle stripping system arranged above the zinc melt, cf. Fig. 1.
  • the layer thickness is adjusted with air or nitrogen, whereby the minimum coating thickness that can be represented increases with increasing belt speed. This means that thin runs cannot be produced at high belt speeds. But especially thin runs ( ⁇ 25 g / m 2 , one-sided with hot-dip galvanized sheet) are required for certain demanding applications.
  • So-called vertical hot-dip galvanizing is known as a further developed process for hot-dip coating of ferritic steel strip made of soft, unalloyed steels and is described in various patents such as EP 0 630 421 B1 and EP 0 630 420 B1 and EP 0 673 444 B1.
  • process 2 the strip runs through a working vessel filled with molten metal made of zinc and / or Al alloys from bottom to top, the strip having previously undergone a temperature treatment and the strip entering the melt underneath Air is closed.
  • the smelting volume is significantly lower compared to process 1 with approx. 2-5 t liquid zinc.
  • the above-mentioned qualitative problems do not exist either, since the alloying measures are carried out in a reservoir located next to the line and the strip quality is generated separately in the working vessel.
  • the connection between the working vessel and the furnace chamber underneath is made through a gas-tight ceramic channel, which is approx. 800 high and a passage width of only max. Has 20 mm.
  • the method 2 is characterized in that, at least in the coating area up to the weld pool, significantly higher belt speeds in the range of 300 m / min can be produced without problems even with thin steel belt, since there are no rollers in the coating vessel.
  • the coating unit with a temperature, for example, of hot-dip galvanizing from approx. 460 ° C from bottom to top, comparable to method 1, just above the melting bath, the desired thickness of the metallic finishing layer is set using the nozzle stripping method. This is done in a similar way to the process by inflating compressed air or nitrogen.
  • the nozzle wiping process comparable to process 1, a in process 2, limits the maximum possible Ba speed in the case of thin coatings.
  • the method 2 offers greater degrees of freedom, the galvanizing parameters temperature, viscosity of the melt and alloy composition, which also affect the layer thickness. For this reason, it can be expected that the belt speed in process 2 of the same layer thickness can be chosen to be higher than in process 1.
  • method 2 is n on an industrial scale not been tested. So far, only trials with pilot plants with narrow belts have been carried out. These were successful.
  • Cooling usually takes place with the aid of several air cooling sections arranged one behind the other.
  • the cooling effect and more precisely the cooling rate is limited due to the medium and cannot be increased arbitrarily over a defined distance (e.g. 2 x 15 m) using the cooling medium air.
  • a defined distance e.g. 2 x 15 m
  • the cooling sections With increasing belt speed or with increasing mass throughput, the cooling sections have to be extended. However, this entails the increase in the upper deflection roller in the cooling tower of a hot-dip coating plant.
  • the height of the upper pulley is usually between 30-60 m.
  • the cooling sections would have to be correspondingly extended further at high belt speeds, and the cooling tower height could possibly be increased in the direction of 80-90 m. This entails higher investment costs for buildings and foundations.
  • the object of the present invention is to avoid the above-mentioned disadvantages of methods 1 and 2 and to create a high-speed hot-dip coating plant without a cooling tower, which combines the least possible construction effort with optimized investment costs and high plant performance with the best production quality.
  • Figure 1 shows a conventional coating process for strips
  • Figure 2 shows a further developed coating process according to the state of the art
  • Figure 3 shows the coating method according to the invention and a correspondingly designed high-speed hot-dip coating plant in operation
  • FIG 4 shows the system according to Figure 3 in the start-up situations
  • Figure 5 shows the system according to Figure 3 at a standstill after operation
  • volume 1 runs vertically downwards into a container in which the melt pool is located after being deflected in the furnace with the exclusion of air. This weld pool is sealed at the bottom. Forces are required, which are not electromagnetic, but are generated with the help of rotating permanent magnets. Sealing the melt with permanent magnets is known per se. But rectangular channels were used there. This channel shape cannot be changed in distance and shape.
  • the present invention proposes two adjacent rotors 5, 5 '.
  • the rotors are tubes 6, 6 'made of temperature and melt resistant materials, preferably ceramic.
  • the diameter of which can be freely selected, rollers rotate, on the lateral surface of which permanent magnets 4 are arranged.
  • the rotors 5, 5 ' can be turned to melt or to the band. It is also possible to close gap 7 when the system is at a standstill or when starting up the system.
  • Permanent magnets are considerably less expensive than electromagnetic sealing by means of coils or indectors, and much less energy is required for rotation than for electromagnetic sealing, which is particularly advantageous in the event of a power failure.
  • the tape 1 can be clamped much shorter than in the previously known methods 1 and 2, since the tape 1 can be immediately cooled and deflected in a water bath 9 directly below the sealing unit.
  • the guy length in the present invention is preferably only about 5000 mm, in process 1 this is approx. 8-10 times higher and in process 2 even higher.
  • a further advantage of the method according to the invention is that the surface of the molten metal, preferably the zinc melt, is in the coating area within a protective gas atmosphere, preferably consisting of a nitrogen / hydrogen mixture, and there can be no disruptive oxidation of the liquid zinc.
  • a protective gas atmosphere preferably consisting of a nitrogen / hydrogen mixture
  • the plant for hot-dip coating a non-ferrous metal strip or a steel strip 1 is in the state of ongoing operation.
  • the incoming and to be finished band 1 passes through a tensioning roller 17 in the furnace 2 and then through the lock 18, which the inside of the dip finishing the prevailing protective gas atmosphere hermetically seals off from the atmosphere of the environment.
  • the strip 1 is deflected into the vertical against the coating section 19 via guide rollers 13.
  • the strip 1 runs vertically from top to bottom through the bath of melt 3 maintained in the gap 7 between the rotors 5, 5 'and thus receives the desired coating.
  • This melt pool 3 is prevented in a gap formed between spaced rotors 5, 5 ', at the lower end, from moving downwards with the aid of magnetic forces from magnetic fields or traveling magnetic fields of the rotating permanent magnets 4.
  • the rotors 5, 5 ' are located within the pipes 6, 6' surrounding them in the coating section 19 which is surrounded on the outside by a channel-shaped housing and which accommodates the rotors 5, 5 in a variable manner. They are surrounded by the tubes 6, 6 'made of temperature and melt-resistant, in particular non-magnetic material, preferably ceramic.
  • the permanent magnets 4 rotate within these tubes 6, 6 ′.
  • the melt required for coating and to be continuously supplemented is conveyed from a supply container 8, in which it is conditioned, by means of a quantity-controlled metal pump 12 into the gap 7 between the rotors 5, 5 '.
  • the band 1 coated therein passes through the gap 7 at the lower end and then through a device 15 for air stabilization and then a device 16 for water cooling.

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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)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

The invention relates to a method and a device for coating the surfaces of, in particular, strip-like material, for example, a non-ferrous metal strip or a steel strip, with at least one metallic coating by running through at least one container filled with the liquid melt coating material. The metal strip for coating runs through the molten bath of coating material within the container from bottom to top, suitable guide means are provided for the above. The sealing of the container base is achieved by means of circumferential permanent magnets.

Description

Verfahren zur SchmelztauchveredelungProcess for hot-dip coating
Die Erfindung betrifft ein Verfahren zum Beschichten der Oberfläche von insbesondere bandförmigem Gut, beispielsweise eines NE-Metallbandes oder eines Stahlbandes mit wenigstens einem metallischen Überzug im Durchlauf durch mindestens ein das schmelzflüssige Überzugsmaterial aufnehmendes Behältnis. Die Erfindung betrifft auch eine Vorrichtung zur Durchführung des Verfah- rens.The invention relates to a method for coating the surface of, in particular, strip-shaped material, for example a non-ferrous metal strip or a steel strip with at least one metallic coating in the course of passing through at least one container holding the molten coating material. The invention also relates to a device for carrying out the method.
Die konventionelle Feuerbeschichtung von Band (Verfahren 1 genannt) mit Zn-, Zn-Al-, AI- oder Al-Si-Legierungen ist im Beschichtungsbereich dadurch beschrieben, daß das Band aus einem Glühofen unter Luftabschluß in die Schmelze einläuft und mittels unterschiedlicher Anordnung von nicht angetriebenen Rollen in die Vertikale umgelenkt und stabilisiert wird, vgl. Bild 1. Dieses gilt für alle aufgeführten Beschichtungsmetalle /-legierungen bei der Schmelztauchveredelung.The conventional hot-dip coating of strip (called process 1) with Zn, Zn-Al, Al or Al-Si alloys is described in the coating area in that the strip runs into the melt from an annealing furnace with the exclusion of air and by means of a different arrangement of non-driven rollers are deflected into the vertical and stabilized, cf. Figure 1. This applies to all coating metals / alloys listed for hot-dip coating.
Beim Verfahren 1 ist von Nachteil, daß sich Rollen und Lager der Rollen innerhalb der Schmelze befinden und alle Werkstoffe dem chemischen Angriff der Schmelze ausgesetzt sind. Die Lebensdauer aller Einbauten innerhalb der Schmelze ist eingeschränkt. Weiterhin ist ein großes Schmelzvolumen mit entsprechend großem Schmelzgefäß erforderlich, um die Rollen bzw. das gesamte Badequipment aufzunehmen. Üblich sind bei der Feuerverzinkung 200 - 400 t an flüssigem Zink. Eine schnelle Regelung der Schmelze hinsichtlich Temperatur und Legierungszusammensetzung ist aufgrund des großen Volumens nicht möglich. Größere Schwankungen o. g. Parameter müssen in Kauf genommen werden und führen unter Umständen zu qualitativen Einbußen, da le- gierungstechnische Maßnahmen und die Bandqualität im selben Gefäß einander beeinflussen. Ein weiterer Nachteil ist, daß die Produktionsgeschwindigkeit insbesondere bei dünnen Bändern <0,5 mm zur Erzielung einer wirtschaftlichen Anlagenleistung (ca. 180 m/min) nicht erhöht werden kann. Ein Grund hierfür ist, daß es zur Relativbewegung zwischen den im Bad befindlichen Rollen und dem Band kommt. Werden zum Vermeiden dieses Problems die Züge erhöht, besteht die Gefahr eines Bandrisses. Die Folge ist eine Produktion von Schrott und von längeren Anlagenstillständen.A disadvantage of method 1 is that the rollers and bearings of the rollers are located in the melt and all materials are exposed to the chemical attack of the melt. The service life of all internals within the melt is limited. Furthermore, a large melting volume with a correspondingly large melting vessel is required in order to accommodate the rolls or the entire bathing equipment. 200 - 400 tons of liquid zinc are common for hot-dip galvanizing. Rapid regulation of the melt with regard to temperature and alloy composition is not possible due to the large volume. Larger fluctuations in the above parameters have to be accepted and may lead to qualitative losses, since alloying measures and the strip quality in the same vessel influence one another. Another disadvantage is that the production speed, particularly in the case of thin strips <0.5 mm, cannot be increased in order to achieve an economical system output (approx. 180 m / min). One reason for this is that there is relative movement between the rollers in the bath and the belt. If the trains are raised to avoid this problem, there is a risk of a belt break. The result is the production of scrap and longer plant downtimes.
Eine weitere Einschränkung für die maximale Bandgeschwindigkeit einer Feuer- verzinkungsanlage ist durch das oberhalb der Zinkschmelze angeordnete Düsenabstreifsystem gegeben, vgl. Bild 1. Mittels Luft oder Stickstoff wird die Schichtdicke eingestellt, wobei mit zunehmender Bandgeschwindigkeit die minimal darstellbare Überzugsdicke ansteigt. D.h., dünne Auflagen sind bei hohen Bandgeschwindigkeiten nicht zu erzeugen. Aber gerade dünne Auflagen (<25 g/m2, einseitig bei feuerverzinktem Feinblech) sind für bestimmte anspruchsvolle Anwendungen gefragt.A further restriction for the maximum strip speed of a hot-dip galvanizing plant is given by the nozzle stripping system arranged above the zinc melt, cf. Fig. 1. The layer thickness is adjusted with air or nitrogen, whereby the minimum coating thickness that can be represented increases with increasing belt speed. This means that thin runs cannot be produced at high belt speeds. But especially thin runs (<25 g / m 2 , one-sided with hot-dip galvanized sheet) are required for certain demanding applications.
Als weiterentwickeltes Verfahren zur Schmelztauchveredelung von ferritischem Stahlband aus weichen unlegierten Stählen ist die sogenannte vertikale Feuer- verzinkung bekannt und in verschiedenen Patenten wie EP 0 630 421 B1 und EP 0 630 420 B1 und EP 0 673 444 B1 beschrieben.So-called vertical hot-dip galvanizing is known as a further developed process for hot-dip coating of ferritic steel strip made of soft, unalloyed steels and is described in various patents such as EP 0 630 421 B1 and EP 0 630 420 B1 and EP 0 673 444 B1.
Bei diesem Verfahren (Verfahren 2 genannt) durchläuft das Band ein mit schmelzflüssigem Metall aus Zink- und/oder AI-Legierungen gefülltes Arbeits- gefäß von unten nach oben, wobei das Band vorher eine Temperaturbehandlung erfahren hat und der Einlauf des Bandes in die Schmelze unter Luftabschluß erfolgt. Das Schmelzvolumen ist im Vergleich zum Verfahren 1 mit ca. 2-5 t flüssigem Zink wesentlich geringer. Auch gibt es die o.g. qualitativen Probleme nicht, da die legierungstechnischen Maßnahmen in einem neben der Li- nie befindlichen Vorhaltegefäß vorgenommen werden und die Bandqualität im Arbeitsgefäß separat davon erzeugt wird. Die Verbindung zwischen dem Arbeitsgefäß und der darunter befindlic Ofenkammer erfolgt durch einen gasdichten Keramikkanal, der ca. 800 hoch ist und für das Band eine Durchgangsbreite von nur max. 20 mm hat. Abdichtung des Arbeitsgefäßes nach unten und das Vermeiden des Herur laufens von Schmelze in den Ofenraum erfolgt innerhalb dieses Kanals mil zweier seitlich am Kanal bzw. Band angeordneter Induktoren. Diese Induktc erzeugen ein elektromagnetisches Wanderfeld, das eine nach oben gerich Kraft erzeugt, die die Schmelze am Herunterlaufen hindert. Dieses induk System arbeitet wie eine Pumpe, so daß auch der Austausch der Schmelze Kanal gewährleistet ist.In this process (called process 2), the strip runs through a working vessel filled with molten metal made of zinc and / or Al alloys from bottom to top, the strip having previously undergone a temperature treatment and the strip entering the melt underneath Air is closed. The smelting volume is significantly lower compared to process 1 with approx. 2-5 t liquid zinc. The above-mentioned qualitative problems do not exist either, since the alloying measures are carried out in a reservoir located next to the line and the strip quality is generated separately in the working vessel. The connection between the working vessel and the furnace chamber underneath is made through a gas-tight ceramic channel, which is approx. 800 high and a passage width of only max. Has 20 mm. Sealing of the working vessel downwards and avoiding the running of melt into the furnace space takes place within this channel with two inductors arranged on the side of the channel or belt. These inductors generate an electromagnetic traveling field, which generates an upward force that prevents the melt from running down. This induk system works like a pump, so that the exchange of the melt channel is guaranteed.
Das Verfahren 2 zeichnet sich dadurch aus, daß zumindest im Beschichtur bereich bis zum Schmelzbad wesentlich höhere Bandgeschwindigkeiten im reich von 300 m/min auch bei dünnem Stahlband problemlos darstellbar i dürften, da keine Rollen im Beschichtungsgefäß vorhanden sind.The method 2 is characterized in that, at least in the coating area up to the weld pool, significantly higher belt speeds in the range of 300 m / min can be produced without problems even with thin steel belt, since there are no rollers in the coating vessel.
Nachdem das Band die Beschichtungseinheit mit einer Temperatur beispi weise bei der Feuerverzinkung von ca. 460°C von unten nach oben durchlai hat, erfolgt vergleichbar zum Verfahren 1 kurz oberhalb des Schmelzbades Einstellen der gewünschten Dicke der metallischen Veredelungsschicht n dem Düsenabstreifverfahren. Dieses geschieht vergleichbar zum Verfahre mittels Aufblasen von Pressluft oder Stickstoff.After the strip has passed the coating unit with a temperature, for example, of hot-dip galvanizing from approx. 460 ° C from bottom to top, comparable to method 1, just above the melting bath, the desired thickness of the metallic finishing layer is set using the nozzle stripping method. This is done in a similar way to the process by inflating compressed air or nitrogen.
Das Düsenabstreifverfahren beschränkt vergleichbar mit dem Verfahren 1 , a beim Verfahren 2 im Falle von dünnen Überzügen die maximal mögliche Ba geschwindigkeit. Allerdings bietet das Verfahren 2 größere Freiheitsgrade die ebenfalls auf die Schichtdicke wirkenden Verzinkungsparameter Tempt tur, Viskosität der Schmelze und Legierungszusammensetzung. Es ist aus ι sem Grund zu erwarten, daß die Bandgeschwindigkeit beim Verfahren 2 gleicher Schichtdicke im Vergleich zum Verfahren 1 höher gewählt wen kann. Im Vergleich zum Verfahren 1 ist das Verfahren 2 großtechnisch n nicht getestet worden. Es haben bisher nur Versuche mit Pilotanlagen mit schmalem Band stattgefunden. Diese waren erfolgreich.The nozzle wiping process, comparable to process 1, a in process 2, limits the maximum possible Ba speed in the case of thin coatings. However, the method 2 offers greater degrees of freedom, the galvanizing parameters temperature, viscosity of the melt and alloy composition, which also affect the layer thickness. For this reason, it can be expected that the belt speed in process 2 of the same layer thickness can be chosen to be higher than in process 1. In comparison to method 1, method 2 is n on an industrial scale not been tested. So far, only trials with pilot plants with narrow belts have been carried out. These were successful.
Einer Geschwindigkeitserhöhung steht jedoch die Tatsache entgegenstehen, daß das Band nachfolgend im Aufwärtsstrang vor der ersten Umlenkung unter 300°C abgekühlt werden muß. Liegt die Temperatur höher, besteht die Gefahr, daß metallische Partikel an der ersten Kontakt- bzw. Umlenkrolle im Kühlturm aufwachsen und irreparable Oberflächenfehler am Material erzeugen.However, there is an obstacle to an increase in speed that the belt must subsequently be cooled below 300 ° C. in the upward strand before the first deflection. If the temperature is higher, there is a risk that metallic particles will grow on the first contact or deflection roller in the cooling tower and produce irreparable surface defects on the material.
Das Abkühlen erfolgt üblicherweise mit Hilfe von mehreren hintereinander an- geordneten Luftkühlstrecken. Die Kühlwirkung und genauer die Kühlrate ist aber mediumbedingt limitiert und kann unter Verwendung des Kühlmediums Luft auf einer festgelegten Strecke (z.B. 2 mal 15 m) nicht beliebig gesteigert werden. Mit zunehmender Bandgeschwindigkeit bzw. mit zunehmendem Massendurchsatz müssen die Kühlstrecken verlängert werden. Das zieht aber die Erhöhung der oberen Umlenkrolle im Kühlturm einer Schmelztauchverede- lungsanlage nach sich.Cooling usually takes place with the aid of several air cooling sections arranged one behind the other. The cooling effect and more precisely the cooling rate is limited due to the medium and cannot be increased arbitrarily over a defined distance (e.g. 2 x 15 m) using the cooling medium air. With increasing belt speed or with increasing mass throughput, the cooling sections have to be extended. However, this entails the increase in the upper deflection roller in the cooling tower of a hot-dip coating plant.
Bei Anlagen nach dem Verfahren 1 liegt die Höhe der oberen Umlenkrolle üblicherweise zwischen 30-60 m. Für das Verfahren 2 müßten bei hohen Bandge- schwindigkeiten die Kühlstrecken entsprechend weiter verlängert und damit die Kühlturmhöhe möglicherweise in Richtung 80-90 m gesteigert werden. Dieses zieht höhere Investitionskosten für Gebäude und Fundamente nach sich.In systems using method 1, the height of the upper pulley is usually between 30-60 m. For method 2, the cooling sections would have to be correspondingly extended further at high belt speeds, and the cooling tower height could possibly be increased in the direction of 80-90 m. This entails higher investment costs for buildings and foundations.
Damit würde sich die freilaufende, unstabilisierte Bandstrecke im Turm verlän- gern und sich der Bandlauf verschlechtern, so daß Schwingungen auftreten und die Produktqualität negativ beeinflussen können. Die Verwendung anderer Kühlmedien im Aufwärtsstrang ist problematisch und großtechnisch bisher nicht gelöst.This would lengthen the free-running, unstabilized belt section in the tower and worsen the belt run so that vibrations can occur and have a negative impact on product quality. The use of other cooling media in the upward line is problematic and has not yet been solved on an industrial scale.
Ein weiteres Problem bei der elektromagnetischen Abdichtung nach Verfahren 2 ist. dass die Kräfte, die auf die flüssige Schmelze wirken, insbesondere auch auf das ferritische Band wirken. Ein unerwünschten Kontakt des Bandes mit dem Kanal durch die Magnetkräfte der abdichtenden Induktoren ist nur durch zusätzliche aufwendige Maßnahmen möglich. Zusätzliche Stabilisierungsspulen und eine aufwendige Regelungstechnik sind dazu erforderlich.Another problem with method 2 electromagnetic sealing is. that the forces that act on the liquid melt, in particular, also act on the ferritic band. An unwanted contact of the tape with the channel by the magnetic forces of the sealing inductors is only possible through additional complex measures. Additional stabilizing coils and complex control technology are required.
Die vorliegende Erfindung hat zur Aufgabe, die oben genannten Nachteile der Verfahren 1 und 2 zu vermeiden und eine Hochgeschwindigkeits-Schmelz- tauch-veredlungsanlage ohne Kühlturm zu schaffen, die den geringst möglichen bautechnischen Aufwand mit optimierten Investitionskosten und hoher Anlagenleistung bei bester Produktionsqualität vereinigt.The object of the present invention is to avoid the above-mentioned disadvantages of methods 1 and 2 and to create a high-speed hot-dip coating plant without a cooling tower, which combines the least possible construction effort with optimized investment costs and high plant performance with the best production quality.
Diese Aufgabe wird bei einem Verfahren der im Oberbegriff von Anspruch 1 beschriebenen Art gelöst, indem das Behältnis mittels umlaufender Permanentmagnete abgedichtet wird. Die Abdichtung des Behältnisses mittels umlaufender Permanentmagnete ist wesentlich sicherer und kostengünstiger als eine elektromagnetische Lösung und es wird wesentliche weniger Energie für die Rotation benötigt als für eine elektromagnetische Abdichtung, was besonders bei Stromausfall von Vorteil ist.This object is achieved in a method of the type described in the preamble of claim 1 in that the container is sealed by means of rotating permanent magnets. Sealing the container by means of revolving permanent magnets is much safer and cheaper than an electromagnetic solution and considerably less energy is required for the rotation than for an electromagnetic seal, which is particularly advantageous in the event of a power failure.
Ausgestaltungen des Verfahrens sind in weiteren Unteransprüchen beschrie- ben. Eine Vorrichtung und deren Ausgestaltung zur Durchführung des Verfahrens ist Gegenstand weiterer Ansprüche.Refinements of the method are described in further subclaims. A device and its configuration for carrying out the method is the subject of further claims.
Die Erfindung wird anhand einiger schematisch dargestellter Ausführungsbeispiele beschrieben. Es zeigen:The invention is described on the basis of some schematically illustrated exemplary embodiments. Show it:
Bild 1 ein herkömmliches Beschichtungsverfahren von BandFigure 1 shows a conventional coating process for strips
Bild 2 ein weiterentwickeltes Beschichtungsverfahren gemäß dem Stand der Technik Bild 3 das erfindungsgemäße Beschichtungsverfahren sowie eine entsprechend gestaltete Hochgeschwindigkeits-Schmelztauchveredelungs- anlage in BetriebFigure 2 shows a further developed coating process according to the state of the art Figure 3 shows the coating method according to the invention and a correspondingly designed high-speed hot-dip coating plant in operation
Bild 4 die Anlage nach Bild 3 in den AnfahrsituationenFigure 4 shows the system according to Figure 3 in the start-up situations
Bild 5 die Anlage nach Bild 3 im Stillstand nach BetriebFigure 5 shows the system according to Figure 3 at a standstill after operation
Gemäß Bild 3 läuft Band 1 nach einer Umlenkung im Ofen unter Luftabschluß senkrecht nach unten in ein Behältnis, in dem sich das Schmelzbad befindet. Dieses Schmelzbad wird nach unten hin abgedichtet. Dafür sind Kräfte erforderlich, die aber nicht elektromagnetischer Art sind, sondern mit Hilfe von umlaufenden Permanentmagneten erzeugt werden. Das Abdichten der Schmelze mit Permanentmagneten ist an sich bekannt. Aber dort wurde mit rechteckigen Kanälen gearbeitet. Diese Kanalform kann in Abstand und Form nicht verändert werden.According to Fig. 3, volume 1 runs vertically downwards into a container in which the melt pool is located after being deflected in the furnace with the exclusion of air. This weld pool is sealed at the bottom. Forces are required, which are not electromagnetic, but are generated with the help of rotating permanent magnets. Sealing the melt with permanent magnets is known per se. But rectangular channels were used there. This channel shape cannot be changed in distance and shape.
Demgegenüber schlägt die vorliegende Erfindung zwei nebeneinander liegende Rotoren 5, 5' vor. Die Rotoren sind Rohre 6, 6' aus temperatur- und schmelzebeständigem Materialien, vorzugsweise aus Keramik. Innerhalb dieser Rohre 6, 6', deren Durchmesser frei gewählt werden kann, rotieren Rollen, auf deren Mantelfläche Permanentmagnete 4 angeordnet sind. Die Rotoren 5, 5' können zur Schmelze bzw. zum Band angestellt werden. Auch ist es möglich den Spalt 7 beim Anlagenstillstand oder beim Anfahren der Anlage zu schließen.In contrast, the present invention proposes two adjacent rotors 5, 5 '. The rotors are tubes 6, 6 'made of temperature and melt resistant materials, preferably ceramic. Within these tubes 6, 6 ', the diameter of which can be freely selected, rollers rotate, on the lateral surface of which permanent magnets 4 are arranged. The rotors 5, 5 'can be turned to melt or to the band. It is also possible to close gap 7 when the system is at a standstill or when starting up the system.
Permanentmagnete sind wesentlich kostengünstiger als die elektromagnetische Abdichtung mittels Spulen bzw. Indektoren und es wird wesentlich weniger Energie für die Rotation benötigt als für eine elektromagnetische Abdichtung, was besonders bei Stromausfall von Vorteil ist.Permanent magnets are considerably less expensive than electromagnetic sealing by means of coils or indectors, and much less energy is required for rotation than for electromagnetic sealing, which is particularly advantageous in the event of a power failure.
Mit Permanentmagneten sind weiterhin wesentlich höhere Feldstärken (Faktor 3) gegenüber der elektromagnetischen Arbeitsweise darstellbar. Diese hohen Feldstärken bzw. die daraus resultierenden höheren Kräfte werden für den Abstreifprozeß zur Einstellung der gewünschten Beschichtungsdicke auf dem Stahlband benötigt. Dieses muß bei den vorbekannten Verfahren mittels zusätzlicher Abstreifdüsen erfolgen.With permanent magnets, significantly higher field strengths (factor 3) can be represented compared to the electromagnetic mode of operation. These high Field strengths or the resulting higher forces are required for the stripping process to set the desired coating thickness on the steel strip. In the previously known methods, this must be done by means of additional wiping nozzles.
Zusätzliche Maßnahmen innerhalb der magnetischen Abdichtung und Abstreifung müssen bei dem erfindungsgemäßen Verfahren nicht mehr erfolgen, da der Bereich des engsten Durchgangs des Bandes 1 durch die Abdichteinheit nur noch wenige Millimeter beträgt. Weiterhin kann das Band 1 wesentlich kürzer als bei den vorbekannten Verfahren 1 und 2 eingespannt werden, da direkt unterhalb der Abdichteinheit das Band 1 in einem Wasserbad 9 sofort abgekühlt und umgelenkt werden kann, Die Abspannlänge bei der vorliegenden Erfindung liegt vorzugsweise bei nur ca. 5000 mm, bei dem Verfahren 1 liegt diese ca. 8-10 mal höher und beim Verfahren 2 noch höher.Additional measures within the magnetic seal and stripping no longer have to be carried out in the method according to the invention, since the area of the narrowest passage of the band 1 through the sealing unit is only a few millimeters. Furthermore, the tape 1 can be clamped much shorter than in the previously known methods 1 and 2, since the tape 1 can be immediately cooled and deflected in a water bath 9 directly below the sealing unit. The guy length in the present invention is preferably only about 5000 mm, in process 1 this is approx. 8-10 times higher and in process 2 even higher.
Ein weiterer Vorteil des erfindungsgemäßen Verfahrens ist, daß sich die Oberfläche des schmelzflüssigen Metalls vorzugsweise der Zinkschmelze im Be- schichtungsbereich innerhalb einer Schutzgasatmosphäre vorzugsweise bestehend aus einem StickstoffTWasserstoffgemisch befindet und eine störende Oxidation des flüssigen Zinks nicht stattfinden kann. Bei den vorbekannten Verfahren 1 und 2 kann dieses nur mit zusätzlichem erheblichen Aufwand durchgeführt werden. Weiterhin ist es bei diesen Verfahren erforderlich, daß die Zinkbadoberfläche für bestimmte manuelle Arbeiten zugänglich sein muß. Bei der vorliegenden Erfindung ist ein Zugang zur Schmelzbadoberfläche zum Zwecke des Entfernens von oxydischen Partikel nicht erforderlich.A further advantage of the method according to the invention is that the surface of the molten metal, preferably the zinc melt, is in the coating area within a protective gas atmosphere, preferably consisting of a nitrogen / hydrogen mixture, and there can be no disruptive oxidation of the liquid zinc. In the previously known methods 1 and 2, this can only be carried out with additional considerable effort. Furthermore, it is necessary with these methods that the zinc bath surface must be accessible for certain manual work. In the present invention, access to the molten bath surface for the purpose of removing oxide particles is not required.
Im Ausführungsbeispiel nach Bild 3 befindet sich die Anlage zur Schmelztauchveredelung eines NE-Metallbandes, oder eines Stahlbandes 1 im Zustand eines laufenden Betriebes.In the exemplary embodiment according to Figure 3, the plant for hot-dip coating a non-ferrous metal strip or a steel strip 1 is in the state of ongoing operation.
Das zulaufende und zu veredelnde Band 1 durchläuft im Ofen 2 eine Spannrolle 17 und danach die Schleuse 18, welche die im Innern der Tauchveredlungsan- läge herrschende Schutzgasatmosphäre gegenüber der Atmosphäre der Umwelt mit Sauerstoff hermetisch abschließt.The incoming and to be finished band 1 passes through a tensioning roller 17 in the furnace 2 and then through the lock 18, which the inside of the dip finishing the prevailing protective gas atmosphere hermetically seals off from the atmosphere of the environment.
In der anschließenden Verzinkungskammer 14 wird das Band 1 über Führungsrollen 13 in die Vertikale gegen die Beschichtungssektion 19 umgelenkt. Beim Eintritt in die Beschichtungsstation 19 durchläuft das Band 1 in vertikaler Richtung von oben nach unten das im Spalt 7 zwischen den Rotoren 5, 5' aufrecht erhaltene Bad von Schmelze 3 und erhält somit die gewünschte Beschichtung. Dieses Schmelzbad 3 wird in einem zwischen beabstandeten Rotoren 5, 5', ausgebildeten Spalt am unteren Ende mit Hilfe magnetischer Kräfte von Magnetfeldern bzw. Wandermagnetfeldern der rotierenden Permanentmagneten 4 am Durchlaufen nach unten gehindert. Die Rotoren 5, 5' befinden sich innerhalb der sie umgehenden Rohre 6, 6' in der nach außen durch ein kanalförmiges Gehäuse umgebenen Beschichtungssektion 19, welche die Rotoren 5,5 ab- standsveränderlich aufnimmt. Sie sind umgeben den Rohren 6, 6' aus tempe- ratur- und schmelzebeständigem, insbesondere unmagnetischen Material, bevorzugt aus Keramik. Innerhalb dieser Rohre 6, 6' rotieren die Permanentmagnete 4.In the subsequent galvanizing chamber 14, the strip 1 is deflected into the vertical against the coating section 19 via guide rollers 13. When entering the coating station 19, the strip 1 runs vertically from top to bottom through the bath of melt 3 maintained in the gap 7 between the rotors 5, 5 'and thus receives the desired coating. This melt pool 3 is prevented in a gap formed between spaced rotors 5, 5 ', at the lower end, from moving downwards with the aid of magnetic forces from magnetic fields or traveling magnetic fields of the rotating permanent magnets 4. The rotors 5, 5 'are located within the pipes 6, 6' surrounding them in the coating section 19 which is surrounded on the outside by a channel-shaped housing and which accommodates the rotors 5, 5 in a variable manner. They are surrounded by the tubes 6, 6 'made of temperature and melt-resistant, in particular non-magnetic material, preferably ceramic. The permanent magnets 4 rotate within these tubes 6, 6 ′.
Die zum beschichten erforderliche und laufend zu ergänzende Schmelze wird aus einem Vorlagebehälter 8, worin sie, konditioniert wird, mittels einer Metallpumpe 12 mengengeregelt in den Spalt 7 zwischen die Rotoren 5, 5' gefördert. Das darin beschichtete Band 1 durchläuft den Spalt 7 am unteren Ende und anschließend eine Einrichtung 15 zur Luftstabilisierung, sowie anschließend eine Einrichtung 16 zur Wasserkühlung.The melt required for coating and to be continuously supplemented is conveyed from a supply container 8, in which it is conditioned, by means of a quantity-controlled metal pump 12 into the gap 7 between the rotors 5, 5 '. The band 1 coated therein passes through the gap 7 at the lower end and then through a device 15 for air stabilization and then a device 16 for water cooling.
Es wird nach Durchlauf des Wasserbades 9 und einer Spannrolle 20 zur weiteren Verwendung oder Behandlung aus der Anlage abgezogen.After passing through the water bath 9 and a tensioning roller 20, it is withdrawn from the system for further use or treatment.
Die weiteren Bilder 4 und 5 zeigen das erfindungsgemäße VerfahrenThe further pictures 4 and 5 show the method according to the invention
a) in einer Anfahrsituation, und b) im Stillstand nach Betrieb.a) in a starting situation, and b) at a standstill after operation.
a) Anfahrsituation:a) Starting situation:
- Band steht- Band stands
- Rotoren drehen - Spalt zwischen Rotoren geschlossen- Rotate rotors - gap between rotors closed
- Schmelze wird zugeführt- Melt is fed
- Ofenkammer geschlossen- Oven chamber closed
b) Stillstand nach Betrieb - Rücklauf von Schmelzeb) Standstill after operation - melt return
- Rotoren drehen- Turn the rotors
- Spalt geschlossen- gap closed
- Ofenkammer geöffnet. - Oven chamber opened.

Claims

Patentansprüche claims
1 Verfahren zum Beschichten der Oberfläche von insbesondere bandförmigem Gut, beispielsweise eines NE-Metallbandes oder eines Stahlbandes mit wenigstens einem metallischen Überzug im Durchlauf durch mindestens ein das schmelzflüssige Überzugsmaterial aufnehmendes Behältnisses, dadurch gekennzeichnet, daß das Behältnis mittels umlaufender Permanentmagnete abgedichtet wird.1 method for coating the surface of, in particular, strip-shaped material, for example a non-ferrous metal strip or a steel strip with at least one metallic coating in the passage through at least one container holding the molten coating material, characterized in that the container is sealed by means of rotating permanent magnets.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß mittels der umlaufenden Permanentmagnete zugleich die Einstellung der gewünschten Beschichtungsdicke auf dem metallischen Band vorgenommen wird.2. The method according to claim 1, characterized in that at the same time the setting of the desired coating thickness is made on the metallic strip by means of the rotating permanent magnets.
3. Verfahren nach Anspruch 1 oder 2 dadurch gekennzeichnet, daß das schmelzflüssige Überzugsmaterial aus einem Vorlagebehälter in den Zwickel zweier gegenläufig drehender Rotoren eingeführt wird, wobei das metallische Band von oben nach unten durch das Schmelzbad und zwischen den beabstandeten Rotoren hindurch geführt wird.3. The method according to claim 1 or 2, characterized in that the molten coating material is introduced from a storage container into the gusset of two counter-rotating rotors, the metallic strip being guided from top to bottom through the melt pool and between the spaced-apart rotors.
4. Verfahren nach einem oder mehreren der vorhergehenden Ansprüche. dadurch gekennzeichnet, daß das metallische Band nach einer Umlenkung im Vorwärmofen unter Luftabschluß, vorzugsweise in einer Schutzgasatmosphäre, senkrecht nach unten durch das Schmelzbad hindurch geführt wird. 4. The method according to one or more of the preceding claims. characterized in that, after deflection in the preheating furnace with exclusion of air, preferably in a protective gas atmosphere, the metallic strip is passed vertically downward through the molten bath.
5. Verfahren nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß möglichst direkt unterhalb der Abdichtung des Behältnisses bzw. unterhalb der Rotoren das beschichtete Band luftstabilisiert und/oder was- sergekühlt wird.5. The method according to one or more of the preceding claims, characterized in that the coated strip is air-stabilized and / or water-cooled as possible directly below the seal of the container or below the rotors.
6. Vorrichtung, insbesondere zur Durchführung des Verfahrens nach einem der vorhergehenden Ansprüche, umfassend wenigstens ein Behältnis zur Aufnahme eines schmelzflüssigen Überzugsmaterials für metallisches, bandförmiges Gut, dad u rch gekennzeichnet, daß zur Abdichtung des Behältnisses zwei gegenläufige, ggfs. zueinander anstellbare Rotoren vorgesehen sind, wobei innerhalb der Rotoren drehbare Rollen angeordnet sind, auf deren Mantelfläche Permanentmagnete befestigt sind.6. The device, in particular for carrying out the method according to any one of the preceding claims, comprising at least one container for receiving a molten coating material for metallic, band-shaped material, dad u rch characterized in that two opposing, possibly adjustable rotors are provided for sealing the container , wherein rotatable rollers are arranged within the rotors, on the lateral surface of which permanent magnets are attached.
7. Vorrichtung nach Anspruch 6, dad u rch gekennzeichnet, daß das das Schmelzbad aufnehmende Behältnis durch den oberen mitti- gen Raum zwischen den Rotoren ausgebildet ist.7. The device according to claim 6, dad u rch characterized in that the melt receiving container is formed by the upper central space between the rotors.
8. Vorrichtung nach Anspruch 6 oder 7, dad urch geken nzeichnet, daß zumindest die Rotoren unter Aufrechterhaltung einer Schutzgasat- mos-phäre von einem Gehäuse umgeben sind.8. Apparatus according to claim 6 or 7, characterized by the fact that at least the rotors are surrounded by a housing while maintaining a protective gas atmosphere.
9. Vorrichtung nach einem oder mehreren der Ansprüche 6 bis 8, dad u rch gekennzeichnet, daß das Rotorengehäuse mit einer oberen Kammer zwecks Zuführung metallischen Bandes von oben zum Rotorengehäuse sowie mit einem9. The device according to one or more of claims 6 to 8, dad u rch characterized in that the rotor housing with an upper chamber for the purpose of feeding metallic tape from above to the rotor housing and with one
Vorlagebehälter für Schmelze und mit unterhalb des Rotorengehäuses angeordneten Einrichtungen beispielsweise zur Luftstabilisierung und Wasserkühlung des Bandes und ggfs. mit einem weiteren Wasserbad in Verbindung steht. Storage container for melt and with below the rotor housing arranged devices, for example, for air stabilization and water cooling of the belt and possibly with another water bath.
EP02800118A 2001-09-28 2002-09-25 Method for hot-dip finishing Expired - Lifetime EP1430162B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10148158A DE10148158A1 (en) 2001-09-28 2001-09-28 Process for hot-dip coating with reverse strip travel
DE10148158 2001-09-28
PCT/EP2002/010741 WO2003029507A1 (en) 2001-09-28 2002-09-25 Method for hot-dip finishing

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EP1430162A1 true EP1430162A1 (en) 2004-06-23
EP1430162B1 EP1430162B1 (en) 2006-05-24

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EP (1) EP1430162B1 (en)
JP (1) JP2005504177A (en)
KR (1) KR20040045011A (en)
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AT (1) ATE327352T1 (en)
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CA (1) CA2461912A1 (en)
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MX (1) MXPA04002746A (en)
PL (1) PL367442A1 (en)
RU (1) RU2300577C2 (en)
UA (1) UA78722C2 (en)
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DE10240954B4 (en) * 2002-09-05 2012-05-31 Sms Siemag Aktiengesellschaft Device for the hot dip coating of a metal strand
CN100471980C (en) * 2002-09-13 2009-03-25 杰富意钢铁株式会社 Method and apparatus for producing hot dip plated metallic strip
FR2958563A3 (en) * 2010-04-13 2011-10-14 Fives Stein METHOD AND DEVICE FOR COATING METAL BANDS

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DE10148158A1 (en) 2003-04-17
RU2004113102A (en) 2005-05-20
EP1430162B1 (en) 2006-05-24
ATE327352T1 (en) 2006-06-15
ES2264738T3 (en) 2007-01-16
CN1561404A (en) 2005-01-05
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US20050048216A1 (en) 2005-03-03
KR20040045011A (en) 2004-05-31
YU25704A (en) 2006-08-17
BR0212938A (en) 2004-10-13
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DE50206923D1 (en) 2006-06-29
UA78722C2 (en) 2007-04-25

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