EP1597405A1 - Method and device for melt dip coating metal strips, especially steel strips - Google Patents

Method and device for melt dip coating metal strips, especially steel strips

Info

Publication number
EP1597405A1
EP1597405A1 EP04710805A EP04710805A EP1597405A1 EP 1597405 A1 EP1597405 A1 EP 1597405A1 EP 04710805 A EP04710805 A EP 04710805A EP 04710805 A EP04710805 A EP 04710805A EP 1597405 A1 EP1597405 A1 EP 1597405A1
Authority
EP
European Patent Office
Prior art keywords
field
correction
metal strip
coils
guide channel
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.)
Withdrawn
Application number
EP04710805A
Other languages
German (de)
French (fr)
Inventor
Holger Behrens
Rolf Brisberger
Bodo Falkenhahn
Hans-Georg Hartung
Bernhard Tenckhoff
Walter Trakowski
Michael Zielenbach
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Siemag AG
Original Assignee
SMS Demag AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE10312939A external-priority patent/DE10312939A1/en
Application filed by SMS Demag AG filed Critical SMS Demag AG
Publication of EP1597405A1 publication Critical patent/EP1597405A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/24—Removing excess of molten coatings; Controlling or regulating the coating thickness using magnetic or electric fields
    • 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
    • C23C2/34—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
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/50—Controlling or regulating the coating processes

Definitions

  • the invention relates to a method and a device for hot-dip coating of metal strips, in particular steel strips, which are passed obliquely or vertically from bottom to top through the liquid coating metal in a coating station and the coating thickness is checked after emerging, the thin metal tape, which tends to vibrate, is still sealed down in the liquid state of the coating at variable belt speed via an electromagnetic sealing field in the guide channel and is guided laterally against ferromagnetic attraction by a correction field.
  • the method for band stabilization described in the introduction can also be found in DE 195 35 854 C2.
  • the electromagnetic sealing field works there as an electromagnetic traveling field.
  • a controllable magnetic field superimposed on the modulation of the electromagnetic traveling field is applied in the region of the guide channel, the field strength and / or frequency of which can be set as a function of the sensor-detected strip position in the coating channel.
  • the device used for this purpose consists of pairs of magnetic coils, which are arranged one behind the other in the direction of tape travel. Additional coils are also provided around the guide channel.
  • the magnet coil pairs that can be controlled with regard to field strength and / or frequency can be adapted to different strip materials or strip thicknesses.
  • the method described above or the device cannot be used for very thin metal strips or for different bandwidths.
  • the invention has for its object to propose an electromagnetic seal together with a lateral ferromagnetic attraction for all currently known magnetic sealing fields.
  • one or more main coils generate a sealing field with their electromagnetic field and are designed as an electromagnetic traveling field, as a blocking field or as a pump field, and several correction fields are arranged in a selected configuration, their position and Number can be individually determined at least according to different width levels of the metal strip.
  • the advantage is the possibility of adapting to a large number of criteria, to which center deviations could previously arise due to the ferromagnetic attraction of the metal strip in the guide channel.
  • changed thickness, band waves such as, for example, center curvatures, quarterbuckles, crossbows, S-shapes and the like.
  • the main advantage is that a change in width in width steps can already be taken into account when designing the inductors, i.e. a number and the location of the correction fields are matched to a fixed metal bandwidth.
  • the expansion of the magnets can be taken into account by selecting the type of sealing using a traveling field, blocking field or pump field.
  • correction fields are distributed in position and number depending on a production program. Different metal strip widths can be coated using the same process.
  • the correction fields are controlled by separate power supply devices which are operated in phase and clock synchronism with the respective inductor.
  • Correction steps of the correction field compared to the main coil field will be simpler in that the correction fields are operated with direct current.
  • correction fields are operated locally within the sealing field in a field-strengthening or field-weakening manner.
  • the lateral position of the metal strip in the guide channel is queried via measuring coils, measurements being made within the correction fields and / or outside the Correction fields are carried out.
  • the device for hot-dip coating the metal strip is designed for a change in the width of the metal strip in such a way that the inductor has a sealing field with at least two opposing magnetic yoke surfaces with one or more main coils for an electromagnetic traveling field, a blocking field or a pump field and with a plurality of correction coils distributed in the magnetic yoke surface in a selected configuration, the number and position of which is determined in accordance with different widths and / or thicknesses of the metal strip.
  • the influences of the correction coils on the main coil field can be controlled for different bandwidths and / or thicknesses in that the correction coils are arranged in the corners of a polygon as a function of a production program.
  • correction coils are connected to separate power supply sources which are controlled in phase and clock synchronism with the respective main coils
  • the current position of the metal strip in the guide channel can also be recorded for changing speeds of the strip run by providing measuring coils inside and / or outside the correction coils for determining the current strip position within the guide channel.
  • a very precise measurement can be achieved by measuring the lateral position of the metal strip in the guide channel by means of non-contact measuring devices.
  • the correction coils can also be connected to a direct current source.
  • Fig. 3 shows the coating station with the system of the pump field
  • Fig. 4 is a front view of a sealing field with the main coil, the correction coils and the measuring coils.
  • the metal strip 1 is preheated out of an oven via deflection rollers as strip guides 2 at an angle or vertically upwards through the liquid coating metal 3 into a coating station 4.
  • the coating thickness 5 is checked in a stripping system 6.
  • the relatively thin metal strip 1 tends to vibrate, with fluctuations in the strip speed or strip speeds changed according to the selected dimensions while the coating 7 is still liquid, sealing the metal strip 1 downward via an electromagnetic sealing field 13 in the guide channel 8 and is guided laterally against ferromagnetic attraction by a correction field 14.
  • the desired constant central position of the metal strip 1 in the guide channel 8 represents an unstable equilibrium because of the action between magnetic field inductors 9 from two sides and directions. Only in the middle of the guide channel 8 is the sum of the magnetic attraction forces acting on the metal strip 1 Zero. As soon as the metal strip 1 is deflected from its central position, the distance to both inductors 9 changes. The metal strip 1 approaches one of the sealing fields 13 and moves away from the other. A solution to make the two magnetic fields of the inductors 9 so strong to rule out any displacement is ruled out because of the strong heating of the metal strip 1 associated therewith.
  • the central position of the metal strip 1 is now taken into account together with other criteria by generating a sealing field 13 in an inductor 9 with a main coil 9a and as an electromagnetic traveling field 10 (FIG. 1), as a blocking field 11 (FIG. 2) or as a pump field 12 (Fig. 3) selected.
  • Several correction fields 14 are arranged distributed in a selected configuration (FIG. 4), the position and number being individually determined at least according to different width levels of the metal strip 1. 4
  • the correction coils 14a can be arranged within the magnetic yoke surface 15, which is surrounded by the main coil 9a, in a triangular shape or, as drawn, as a polygon. In Fig. 4, both horizontal triangular shapes and vertical triangular shapes are formed.
  • the correction coils 14a or the correction fields 14 form the corners 17 of a polygon and the polygon 18 can represent a triangle, a square up to an n-corner.
  • the size of the correction coils 14a influences their position and distribution.
  • the distribution of the correction coils 14a or the correction fields 14 takes place in position and number in dependence on the selected metal strip width steps analogous to a production program.
  • the lateral or central position of the metal strip 1 in the guide channel 8 can be measured continuously using non-contact measuring devices.
  • the measuring coils 16 lie (FIG. 4) inside or outside the correction coils 14a, so that a measurement image is produced over the entire metal bandwidth. As a result, the anomalies of the metal strip shape or the position described above are detected.
  • the choice of the electromagnetic traveling field 10 or an electromagnetic blocking field 11 or an electromagnetic pump field 12 is made via the material parameters (strength, structural structure) of the metal strip 1.

Landscapes

  • 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 method for melt dip coating a metal strip (1), especially a steel strip (1a), which is guided through a coating station (4). The metal strip (1) is coated with a coating metal (3), the metal strip (1) is centrally maintained in a guide channel (8) in an electromagnetic sealing field (13) which seals the guide channel (8) from below and guides the metal strip (1) laterally, counter to ferromagnetic attraction, through a corrector field (14). The sealing field (13) is embodied as an electromagnetic guiding field (10), as a blocking field (11) or as a pump field (12) in order to select adequate lateral sealing when any particular sealing field (13) is used. Several corrector fields (14) are arranged in a distributed manner in a selected configuration, whereby the position and number thereof are determined individually at least according to the various widths of the metal strip (1).

Description

Verfahren und Einrichtung zum Schmelztauch-Beschichten von Metallbändern, insbesondere von StahlbändernMethod and device for hot-dip coating of metal strips, in particular steel strips
Die Erfindung betrifft ein Verfahren und eine Einrichtung zum Schmelztauch-Beschichten von Metallbändern, insbesondere von Stahlbändern, die schräg oder vertikal von unten nach oben durch das flüssige Beschichtungsmetall hindurch in einer Beschichtungsstation geführt werden und nach dem Austreten die Be- schichtungsdicke kontrolliert wird, wobei das dünne, zu Schwingungen neigende Metallband noch im flüssigen Zustand der Beschichtung bei veränderlicher Bandgeschwindigkeit über ein elektromagnetisches Abdichtfeld im Führungskanal nach unten abgedichtet und seitlich gegen ferromagnetische Anziehung durch ein Korrekturfeld geführt wird.The invention relates to a method and a device for hot-dip coating of metal strips, in particular steel strips, which are passed obliquely or vertically from bottom to top through the liquid coating metal in a coating station and the coating thickness is checked after emerging, the thin metal tape, which tends to vibrate, is still sealed down in the liquid state of the coating at variable belt speed via an electromagnetic sealing field in the guide channel and is guided laterally against ferromagnetic attraction by a correction field.
Ein derartiges Verfahren und die zugehörige Einrichtung, insbesondere das elektromagnetische Abdichtfeld im Führungskanal, das nach unten abdichtet und seitlich gegen eine ferromagnetische Anziehung wirkt, ist ohne ein Korrekturfeld aus der EP 0 776 382 B1 bekannt.Such a method and the associated device, in particular the electromagnetic sealing field in the guide channel, which seals downward and acts laterally against a ferromagnetic attraction, is known from EP 0 776 382 B1 without a correction field.
Das eingangs bezeichnete Verfahren zur Bandstabilisierung ist außerdem aus der DE 195 35 854 C2 zu entnehmen. Das elektromagnetische Abdichtfeld arbeitet dort als elektromagnetisches Wanderfeld. Dabei ist im Bereich des Führungskanals ein der Aussteuerung des elektromagnetischen Wanderfeldes überlagertes steuerbares Magnetfeld aufgebracht, dessen Feldstärke und / oder Frequenz in Abhängigkeit von der sensorisch erfassten Bandlage im Beschich- tungskanal einstellbar ist. Die hierzu verwendete Einrichtung besteht allerdings aus Paaren von Magnetspulen, die in Bandlaufrichtung hintereinander angeordnet sind. Zusätzlich sind um den Führungskanal herum weitere Spulen vor- gesehen. Dadurch sind die hinsichtlich Feldstärke und / oder Frequenz steuerbaren Magnetspulenpaare an unterschiedliche Bandmaterialien oder Banddik- ken anzupassen. Das vorstehend beschriebene Verfahren oder die Einrichtung sind jedoch weder für sehr dünne Metallbänder noch für unterschiedliche Bandbreiten einsetzbar.The method for band stabilization described in the introduction can also be found in DE 195 35 854 C2. The electromagnetic sealing field works there as an electromagnetic traveling field. In this case, a controllable magnetic field superimposed on the modulation of the electromagnetic traveling field is applied in the region of the guide channel, the field strength and / or frequency of which can be set as a function of the sensor-detected strip position in the coating channel. However, the device used for this purpose consists of pairs of magnetic coils, which are arranged one behind the other in the direction of tape travel. Additional coils are also provided around the guide channel. As a result, the magnet coil pairs that can be controlled with regard to field strength and / or frequency can be adapted to different strip materials or strip thicknesses. However, the method described above or the device cannot be used for very thin metal strips or for different bandwidths.
Der Erfindung liegt die Aufgabe zugrunde, eine elektromagnetische Abdichtung zusammen mit einer gegen seitliche ferromagnetische Anziehung für alle derzeit bekannten magnetischen Abdichtungsfelder vorzuschlagen.The invention has for its object to propose an electromagnetic seal together with a lateral ferromagnetic attraction for all currently known magnetic sealing fields.
Die gestellte Aufgabe wird erfindungsgemäß dadurch gelöst, dass in jeweils einem Induktor eine oder mehrere Hauptspulen mit ihrem elektromagnetischen Feld ein Abdichtfeld erzeugt und als elektromagnetisches Wanderfeld, als Sperrfeld oder als Pumpfeld ausgeführt wird und mehrere Korrekturfelder in einer ausgewählten Konfiguration verteilt angeordnet werden, deren Lage und Anzahl zumindest nach verschiedenen Breitenstufen des Metallbandes individuell festgelegt werden. Der Vorteil ist neben der Vermeidung des Einflusses der ferromagnetischen Anziehung eine Anpassungsmöglichkeit an eine Vielzahl von Kriterien, zu denen bisher Mittenabweichungen durch die ferromagnetische Anziehung des Metallbandes im Führungskanal entstehen konnten. Als Beispiele mögen genannt werden: veränderte Dicke, Bandwellen, wie bspw. Mittenwölbungen, Quarterbuckles, Crossbows, S-Formen u. dgl. Der Hauptvorteil ist jedoch, dass eine Breitenänderung in Breitenstufen schon bei der Konstruktion der Induktoren berücksichtigt werden können, d.h. eine Anzahl und die Lage der Korrekturfelder auf eine feste Metallbandbreite abgestimmt sind. Dabei können die Ausdehnung der Magnete durch Wahl der Abdichtungsart durch Wanderfeld, Sperrfeld oder Pumpfeld berücksichtigt werden.The object is achieved according to the invention in that in one inductor, one or more main coils generate a sealing field with their electromagnetic field and are designed as an electromagnetic traveling field, as a blocking field or as a pump field, and several correction fields are arranged in a selected configuration, their position and Number can be individually determined at least according to different width levels of the metal strip. In addition to avoiding the influence of the ferromagnetic attraction, the advantage is the possibility of adapting to a large number of criteria, to which center deviations could previously arise due to the ferromagnetic attraction of the metal strip in the guide channel. The following may be mentioned as examples: changed thickness, band waves, such as, for example, center curvatures, quarterbuckles, crossbows, S-shapes and the like. The main advantage, however, is that a change in width in width steps can already be taken into account when designing the inductors, i.e. a number and the location of the correction fields are matched to a fixed metal bandwidth. The expansion of the magnets can be taken into account by selecting the type of sealing using a traveling field, blocking field or pump field.
Eine Ausgestaltung sieht vor, dass die Korrekturfelder in Lage und Anzahl in Abhängigkeit eines Produktionsprogrammes verteilt werden. Nach ein und demselben Verfahren können unterschiedliche Metallband-Breiten beschichtet werden. Zur günstigen Steuerung der Magnetfelder von Hauptspule und Korrekturspule ist auch vorteilhaft, dass die Korrekturfelder von getrennten Stromversorgungseinrichtungen angesteuert werden, die phasen- und taktsynchron mit dem jeweiligen Induktor betrieben werden.One embodiment provides that the correction fields are distributed in position and number depending on a production program. Different metal strip widths can be coated using the same process. For favorable control of the magnetic fields of the main coil and correction coil, it is also advantageous that the correction fields are controlled by separate power supply devices which are operated in phase and clock synchronism with the respective inductor.
Dabei werden Korrekturschritte des Korrekturfeldes gegenüber dem Hauptspulenfeld dadurch einfacher ablaufen, dass die Korrekturfelder mit Gleichstrom betrieben werden.Correction steps of the correction field compared to the main coil field will be simpler in that the correction fields are operated with direct current.
Eine weitere Maßnahme zur besseren Beeinflussung der Hauptfelder ist da- durch gegeben, dass die Korrekturfelder lokal innerhalb des Abdichtfeldes feldverstärkend oder feldschwächend betrieben werden.Another measure for better influencing the main fields is given by the fact that the correction fields are operated locally within the sealing field in a field-strengthening or field-weakening manner.
Da das Bestimmen der momentanen Lage des Metallbandes im Führungskanal eine Voraussetzung für die Steuerung der Korrekturfelder ist, wird weiter vorge- schlagen, dass die seitliche Lage des Metallbandes im Führungskanal über Mess-Spulen abgefragt wird, wobei Messungen innerhalb der Korrekturfelder und / oder außerhalb der Korrekturfelder durchgeführt werden.Since the determination of the current position of the metal strip in the guide channel is a prerequisite for the control of the correction fields, it is further proposed that the lateral position of the metal strip in the guide channel is queried via measuring coils, measurements being made within the correction fields and / or outside the Correction fields are carried out.
Es besteht dazu auch die Alternative, dass die seitliche Lage des Metallbandes im Führungskanal kontinuierlich über berührungslose Messverfahren, wie bspw. Laser-Strahlen, gemessen wird.There is also the alternative of continuously measuring the lateral position of the metal strip in the guide channel using non-contact measurement methods, such as laser beams.
Die Einrichtung zur Schmelztauch-Beschichtung des Metallbandes, insbesondere des Stahlbandes, ist für einen Metallband-Breitenwechsel dahingehend ausgebildet, dass der Induktor jeweils zumindest an zwei gegenüberliegenden Magnetjochflächen jeweils ein Abdichtfeld mit einer oder mehreren Hauptspulen für ein elektromagnetisches Wanderfeld, ein Sperrfeld oder ein Pumpfeld und mit mehreren in der Magnetjochfläche in einer ausgewählten Konfiguration verteilten Korrekturspulen aufweist, deren Anzahl und Lage entsprechend ver- schiedener Breiten und / oder Dicken des Metallbandes festgelegt ist. Dazu können für verschiedene Bandbreiten und / oder Dicken die Einflüsse der Korrekturspulen auf das Hauptspulenfeld dadurch gesteuert werden, dass die Korrekturspulen in Abhängigkeit eines Produktionsprogrammes in den Ecken eines Polygons angeordnet sind.The device for hot-dip coating the metal strip, in particular the steel strip, is designed for a change in the width of the metal strip in such a way that the inductor has a sealing field with at least two opposing magnetic yoke surfaces with one or more main coils for an electromagnetic traveling field, a blocking field or a pump field and with a plurality of correction coils distributed in the magnetic yoke surface in a selected configuration, the number and position of which is determined in accordance with different widths and / or thicknesses of the metal strip. For this purpose, the influences of the correction coils on the main coil field can be controlled for different bandwidths and / or thicknesses in that the correction coils are arranged in the corners of a polygon as a function of a production program.
Als Unterstützung für diese Gestaltung dient dabei, dass die Korrekturspulen an getrennte Stromversorgungsquellen angeschlossen sind, die phasen- und taktsynchron mit den jeweiligen Hauptspulen angesteuert sindTo support this design, the correction coils are connected to separate power supply sources which are controlled in phase and clock synchronism with the respective main coils
Die momentane Lage des Metallbandes im Führungskanal kann auch für wech- selnde Geschwindigkeiten des Bandlaufs erfasst werden, indem innerhalb und / oder außerhalb der Korrekturspulen Mess-Spulen für die Bestimmung der momentanen Bandposition innerhalb des Führungskanals vorgesehen sind.The current position of the metal strip in the guide channel can also be recorded for changing speeds of the strip run by providing measuring coils inside and / or outside the correction coils for determining the current strip position within the guide channel.
Im allgemeinen ist eine sehr genaue Messung dadurch erzielbar, dass die seit- liehe Lage des Metallbandes im Führungskanal mittels berührungslos arbeitenden Messmitteln gemessen wird.In general, a very precise measurement can be achieved by measuring the lateral position of the metal strip in the guide channel by means of non-contact measuring devices.
Die Korrekturspulen können auch an eine Gleichstromquelle angeschlossen sein.The correction coils can also be connected to a direct current source.
In der Zeichnung sind Ausführungsformen der Erfindung dargestellt, die nachstehend näher beschrieben werden.In the drawing, embodiments of the invention are shown, which are described in more detail below.
Es zeigen: Fig. 1 die Beschichtungsstation mit dem Magnetsystem des Wanderfeldes,1 shows the coating station with the magnetic system of the traveling field,
Fig. 2 die Beschichtungsstation mit dem System des Sperrfeldes,2 the coating station with the system of the blocking field,
Fig. 3 die Beschichtungsstation mit dem System des Pumpfeldes undFig. 3 shows the coating station with the system of the pump field and
Fig. 4 eine Vorderansicht eines Abdichtfeldes mit der Hauptspule , den Korrekturspulen und den Mess-Spulen. Bei dem Verfahren zum Schmelztauch-Beschichten von Metallbändern 1, insbesondere von Stahlbändern 1a, wird das Metallband 1 vorgewärmt aus einem Ofen über Umlenkrollen als Bandführungen 2 schräg oder vertikal von unten nach oben durch das flüssige Beschichtungsmetall 3 hindurch in eine Beschichtungsstation 4 geführt. Nach dem Austreten aus der Beschichtungsstati- on 4 wird die Beschichtungsdicke 5 in einem Abstreifsystem 6 kontrolliert.Fig. 4 is a front view of a sealing field with the main coil, the correction coils and the measuring coils. In the process for hot-dip coating of metal strips 1, in particular steel strips 1 a, the metal strip 1 is preheated out of an oven via deflection rollers as strip guides 2 at an angle or vertically upwards through the liquid coating metal 3 into a coating station 4. After exiting the coating station 4, the coating thickness 5 is checked in a stripping system 6.
Während des Beschichtens mit Beschichtungsmetall 3 neigt das relativ dünne Metallband 1 zu Schwingungen, wobei noch Schwankungen in der Bandgeschwindigkeit oder jeweils nach den gewählten Abmessungen veränderte Bandgeschwindigkeiten bei noch flüssigem Zustand der Beschichtung 7 das Metallband 1 über ein elektromagnetisches Abdichtfeld 13 im Führungskanal 8 nach unten abgedichtet und seitlich gegen ferromagnetische Anziehung durch ein Korrekturfeld 14 geführt wird.During the coating with coating metal 3, the relatively thin metal strip 1 tends to vibrate, with fluctuations in the strip speed or strip speeds changed according to the selected dimensions while the coating 7 is still liquid, sealing the metal strip 1 downward via an electromagnetic sealing field 13 in the guide channel 8 and is guided laterally against ferromagnetic attraction by a correction field 14.
Die anzustrebende konstante Mittenlage des Metallbandes 1 im Führungskanal 8 stellt wegen der Einwirkung zwischen Magnetfeld-Induktoren 9 von zwei Seiten und Richtungen her, ein labiles Gleichgewicht dar. Nur in der Mitte des Führungskanals 8 ist die Summe der auf das Metallband 1 einwirkenden magnetischen Anziehungskräfte gleich Null. Sobald das Metallband 1 aus seiner Mittenlage ausgelenkt wird, verändert sich der Abstand zu beiden Induktoren 9. Dabei nähert sich das Metallband 1 einem der Abdichtfelder 13 an und entfernt sich vom anderen. Eine Lösung, die beiden Magnetfelder der Induktoren 9 derart stark zu gestalten, um jegliche Verlagerung auszuschließen, scheidet wegen der damit verbundenen starken Erwärmung des Metallbandes 1 aus. Die Mittenlage des Metallbandes 1 wird zusammen mit anderen Kriterien nunmehr durch die Erzeugung eines Abdichtfeldes 13 in jeweils einem Induktor 9 mit einer Hauptspule 9a berücksichtigt und als elektromagnetisches Wanderfeld 10 (Fig. 1), als Sperrfeld 11 ( Fig. 2) oder als Pumpfeld 12 (Fig. 3) gewählt. Mehrere Korrekturfelder 14 werden in einer ausgewählten Konfiguration (Fig. 4) verteilt angeordnet, wobei Lage und Anzahl zumindest nach verschiedenen Breitenstufen des Metallbandes 1 individuell festgelegt werden. Gemäß Fig. 4 können die Korrekturspulen 14a innerhalb der Magnetjochfläche 15, die von der Hauptspule 9a umgeben wird in Dreiecksform oder wie gezeichnet als Polygon angeordnet werden. In Fig. 4 sind sowohl horizontale Dreiecksformen als auch vertikale Dreiecksformen gebildet. Die Korrekturspulen 14a oder die Korrekturfelder 14 bilden die Ecken 17 eines Polygons und das Polygon 18 kann ein Dreieck, ein Viereck bis hin zu einem n-Eck darstellen. Die Größe der Korrekturspulen 14a beeinflusst dabei ihre Lage und Verteilung.The desired constant central position of the metal strip 1 in the guide channel 8 represents an unstable equilibrium because of the action between magnetic field inductors 9 from two sides and directions. Only in the middle of the guide channel 8 is the sum of the magnetic attraction forces acting on the metal strip 1 Zero. As soon as the metal strip 1 is deflected from its central position, the distance to both inductors 9 changes. The metal strip 1 approaches one of the sealing fields 13 and moves away from the other. A solution to make the two magnetic fields of the inductors 9 so strong to rule out any displacement is ruled out because of the strong heating of the metal strip 1 associated therewith. The central position of the metal strip 1 is now taken into account together with other criteria by generating a sealing field 13 in an inductor 9 with a main coil 9a and as an electromagnetic traveling field 10 (FIG. 1), as a blocking field 11 (FIG. 2) or as a pump field 12 (Fig. 3) selected. Several correction fields 14 are arranged distributed in a selected configuration (FIG. 4), the position and number being individually determined at least according to different width levels of the metal strip 1. 4 The correction coils 14a can be arranged within the magnetic yoke surface 15, which is surrounded by the main coil 9a, in a triangular shape or, as drawn, as a polygon. In Fig. 4, both horizontal triangular shapes and vertical triangular shapes are formed. The correction coils 14a or the correction fields 14 form the corners 17 of a polygon and the polygon 18 can represent a triangle, a square up to an n-corner. The size of the correction coils 14a influences their position and distribution.
Die Verteilung der Korrekturspulen 14a oder der Korrekturfelder 14 erfolgt in Lage und Anzahl in Abhängigkeit der ausgewählten Metallband-Breitenstufen analog zu einem Produktionsprogramm.The distribution of the correction coils 14a or the correction fields 14 takes place in position and number in dependence on the selected metal strip width steps analogous to a production program.
Die seitliche bzw. mittige Lage des Metallbandes 1 im Führungskanal 8 kann kontinuierlich über berührungslose Mess-Vorrichtungen gemessen werden. Die Mess-Spulen 16 liegen (Fig. 4) innerhalb oder außerhalb der Korrekturspulen 14a, so dass ein Messbild über die gesamte Metallbandbreite entsteht. Dadurch werden die vorstehend beschriebenen Anomalien der Metallbandform oder der Lage erfasst.The lateral or central position of the metal strip 1 in the guide channel 8 can be measured continuously using non-contact measuring devices. The measuring coils 16 lie (FIG. 4) inside or outside the correction coils 14a, so that a measurement image is produced over the entire metal bandwidth. As a result, the anomalies of the metal strip shape or the position described above are detected.
Die Wahl des elektromagnetischen Wanderfeldes 10 oder eines elektromagne- tischen Sperrfeldes 11 oder eines elektromagnetischen Pumpfeldes 12 erfolgt über die Materialkennwerte ( Festigkeit, Gefügestruktur ) des Metallbandes 1. The choice of the electromagnetic traveling field 10 or an electromagnetic blocking field 11 or an electromagnetic pump field 12 is made via the material parameters (strength, structural structure) of the metal strip 1.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
1 Metallband1 metal band
1a Stahlband1a steel band
2 Bandführung2 tape guide
3 Beschichtungsmetall3 coating metal
4 Beschichtungsstation4 coating station
4a Vorratsbehälter4a storage container
5 Beschichtungsdicke5 coating thickness
6 Abstreifsystem6 scraper system
7 Beschichtung7 coating
8 Führungskanal8 guide channel
9 Induktor9 inductor
9a Hauptspule9a main coil
10 elektromagnetisches Wanderfeld10 electromagnetic traveling field
11 elektromagnetisches Sperrfeld11 electromagnetic blocking field
12 elektromagnetisches Pumpfeld12 electromagnetic pump field
13 Abdichtfeld13 sealing field
14 Korrekturfeld14 correction field
14a Korrekturspule14a correction coil
15 Magnetjochfläche15 magnetic yoke surface
16 Mess-Spule16 measuring coil
17 Ecken eines Polygons17 corners of a polygon
18 Polygon 18 polygon

Claims

Patentansprüche claims
1. Verfahren zum Schmelztauch-Beschichten von Metallbändern (1 ), insbesondere von Stahlbändern (1a), die schräg oder vertikal von unten nach oben durch das flüssige Beschichtungsmetall (3) hindurch in einer Be- schichtungsstation (4) geführt werden und nach dem Austreten die Beschichtungsdicke (5) kontrolliert wird, wobei das dünne, zu Schwingungen neigende Metallband (1 ) noch im flüssigen Zustand der Beschichtung (7) bei veränderlicher Bandgeschwindigkeit über ein elektromagnetisches Abdichtfeld (13) im Führungskanal (8) nach unten abgedichtet und seitlich gegen ferromagnetische Anziehung durch ein Korrekturfeld (14) geführt wird, dadurch gekennzeichnet, dass in jeweils einem Induktor (9) eine oder mehrere Hauptspulen (9a) mit ihrem elektromagnetischen Feld (10, 1 1 , 12) ein Abdichtfeld (13) erzeugt und als elektromagnetisches Wanderfeld (10), als Sperrfeld (11 ) oder als Pumpfeld (12) ausgeführt wird und mehrere Korrekturfelder (14) in einer ausgewählten Konfiguration verteilt angeordnet werden, deren Lage und Anzahl zumindest nach verschiedenen Breitenstufen des Metallbandes (1 ) individuell festgelegt werden.1. Method for hot-dip coating of metal strips (1), in particular steel strips (1a), which are passed obliquely or vertically from bottom to top through the liquid coating metal (3) in a coating station (4) and after exiting the coating thickness (5) is checked, the thin metal strip (1), which tends to vibrate, while still in the liquid state of the coating (7) at variable strip speed, sealed downward via an electromagnetic sealing field (13) in the guide channel (8) and laterally against ferromagnetic Attraction by a correction field (14), characterized in that in one inductor (9) one or more main coils (9a) with their electromagnetic field (10, 1 1, 12) generates a sealing field (13) and as an electromagnetic traveling field (10), as a blocking field (11) or as a pump field (12) and several correction fields (14) in a selected configuration distributed, the position and number of which are individually determined at least according to different width levels of the metal strip (1).
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die Korrekturfelder (14) in Lage und Anzahl in Abhängigkeit eines Pro- duktionsprogrammes verteilt werden. 2. The method according to claim 1, characterized in that the correction fields (14) are distributed in position and number depending on a production program.
3. Verfahren nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass die Korrekturfelder (14) von getrennten Stromversorgungseinrichtungen angesteuert werden, die phasen-. und taktsynchron mit dem jeweiligen Induktor (9) betrieben werden. 3. The method according to any one of claims 1 or 2, characterized in that the correction fields (14) are controlled by separate power supply devices, the phase. and are operated isochronously with the respective inductor (9).
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Korrekturfelder (14) mit Gleichstrom betrieben werden.4. The method according to any one of claims 1 to 3, characterized in that the correction fields (14) are operated with direct current.
5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Korrekturfelder (14) lokal innerhalb des Abdichtfeldes (13) feldverstärkend oder feldschwächend betrieben werden.5. The method according to any one of claims 1 to 4, characterized in that the correction fields (14) are operated locally within the sealing field (13) field-strengthening or field-weakening.
6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die seitliche Lage des Metallbandes (1 ) im Führungskanal (8) über Mess-Spulen (16) abgefragt wird, wobei Messungen innerhalb der Korrekturfelder (14) und / oder außerhalb der Korrekturfelder (14) durchgeführt werden.6. The method according to any one of claims 1 to 5, characterized in that the lateral position of the metal strip (1) in the guide channel (8) via measuring coils (16) is queried, measurements within the correction fields (14) and / or outside the correction fields (14) are carried out.
7. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die seitliche Lage des Metallbandes (1 ) im Führungskanal (8) kontinu- ierlich über berührungslose Messverfahren gemessen wird.7. The method according to any one of claims 1 to 5, characterized in that the lateral position of the metal strip (1) in the guide channel (8) is measured continuously via non-contact measuring methods.
8. Einrichtung zur Schmelztauch-Beschichtung von Metallband (1 ), insbesondere von Stahlband (1a), mit einer schräg oder vertikal von unten nach oben verlaufenden Bandführung (2), einer Beschichtungsstation (4), einem an die Beschichtungsstation (4) unten an den Vorratsbehälter (4a) angeschlossenen Führungskanal (8) für das Metallband (1 ), der mittels eines Induktors (9) zum Abdichten nach unten umgeben ist, mit Korrekturspulen (14a) für eine mittige Lage des Metallbands (1 ) im Führungskanal (8) , und mit einem Abstreifsystem (6) über dem Vorratsbehälter (4a), dadurch gekennzeichnet, dass der Induktor (9) jeweils zumindest an zwei gegenüberliegenden Magnetjochflächen (15) jeweils ein Abdichtfeld (13) mit einer oder mehreren Hauptspulen (9a) für ein elektromagnetisches Wanderfeld (10), ein Sperrfeld (11 ) oder ein Pumpfeld (12) und mit mehreren in der Magnetjochfläche (15) in einer ausgewählten Konfiguration verteilten Korrekturspulen (14a) auf- weist, deren Anzahl und Lage entsprechend verschiedenen Breiten und / oder Dicken des Metallbandes (1) festgelegt ist.8. Device for hot-dip coating of metal strip (1), in particular steel strip (1a), with a sloping or vertical strip guide (2) running from the bottom up, a coating station (4), one at the coating station (4) below the supply channel (4a) connected guide channel (8) for the metal band (1), which is surrounded by an inductor (9) for sealing downwards, with correction coils (14a) for a central position of the metal band (1) in the guide channel (8) , and with a stripping system (6) over the storage container (4a), characterized in that that the inductor (9) in each case at least on two opposite magnetic yoke surfaces (15) has a sealing field (13) with one or more main coils (9a) for an electromagnetic traveling field (10), a blocking field (11) or a pump field (12) and with has a plurality of correction coils (14a) distributed in the magnetic yoke surface (15) in a selected configuration, the number and position of which are determined in accordance with different widths and / or thicknesses of the metal strip (1).
9. Einrichtung nach Anspruch 8, dadurch gekennzeichnet, dass die Korrekturspulen (14a) in Abhängigkeit eines Produktionsprogramms in den Ecken (17) eines Polygons (18) angeordnet sind.9. Device according to claim 8, characterized in that the correction coils (14a) are arranged as a function of a production program in the corners (17) of a polygon (18).
10. Einrichtung nach einem der Ansprüche 8 oder 9, dadurch gekennzeichnet, dass die Korrekturspulen (14a) an getrennte Stromversorgungsquellen angeschlossen sind, die phasen- und taktsynchron mit den jeweiligen Hauptspulen (9a) angesteuert sind.10. Device according to one of claims 8 or 9, characterized in that the correction coils (14a) are connected to separate power supply sources which are driven in phase and clock synchronism with the respective main coils (9a).
1 1. Einrichtung nach einem der Ansprüche 8 bis 10, dadurch gekennzeichnet, dass innerhalb und / oder außerhalb der Korrekturspulen (14a) Mess-Spulen (16) für die Bestimmung der momentanen Bandposition innerhalb des Führungskanals (8) vorgesehen sind.1 1. Device according to one of claims 8 to 10, characterized in that inside and / or outside the correction coils (14a) measuring coils (16) are provided for determining the current tape position within the guide channel (8).
12. Einrichtung nach einem der Ansprüche 8 bis 10, dadurch gekennzeichnet, dass die seitliche Lage des Metallbandes (1 ) im Führungskanal (8) mittels berührungslos arbeitenden Messmitteln gemessen wird.12. Device according to one of claims 8 to 10, characterized in that the lateral position of the metal strip (1) in the guide channel (8) is measured by means of non-contact measuring means.
13. Einrichtung nach einem der Ansprüche 8 bis 12, dadurch gekennzeichnet, dass die Korrekturspulen (14a) an eine Gleichstromquelle angeschlossen sind. 13. Device according to one of claims 8 to 12, characterized in that the correction coils (14a) are connected to a direct current source.
EP04710805A 2003-02-27 2004-02-13 Method and device for melt dip coating metal strips, especially steel strips Withdrawn EP1597405A1 (en)

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DE10308834 2003-02-27
DE10308834 2003-02-27
DE10312939A DE10312939A1 (en) 2003-02-27 2003-03-22 Method and device for hot-dip coating of metal strips, in particular steel strips
DE10312939 2003-03-22
PCT/EP2004/001341 WO2004076707A1 (en) 2003-02-27 2004-02-13 Method and device for melt dip coating metal strips, especially steel strips

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BRPI0407909A (en) 2006-02-14

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