EP0346341A1 - Process for operating hot metallization ovens. - Google Patents

Process for operating hot metallization ovens.

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Publication number
EP0346341A1
EP0346341A1 EP88901021A EP88901021A EP0346341A1 EP 0346341 A1 EP0346341 A1 EP 0346341A1 EP 88901021 A EP88901021 A EP 88901021A EP 88901021 A EP88901021 A EP 88901021A EP 0346341 A1 EP0346341 A1 EP 0346341A1
Authority
EP
European Patent Office
Prior art keywords
melt
coil
deposits
metal
region
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
EP88901021A
Other languages
German (de)
French (fr)
Other versions
EP0346341B1 (en
Inventor
Dieter Schluckebier
Peter Knupfer
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.)
Otto Junker GmbH
Original Assignee
Otto Junker GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Otto Junker GmbH filed Critical Otto Junker GmbH
Priority to AT88901021T priority Critical patent/ATE65553T1/en
Publication of EP0346341A1 publication Critical patent/EP0346341A1/en
Application granted granted Critical
Publication of EP0346341B1 publication Critical patent/EP0346341B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003—Apparatus
    • C23C2/0034—Details related to elements immersed in bath
    • C23C2/00342—Moving elements, e.g. pumps or mixers
    • C23C2/00344—Means for moving substrates, e.g. immersed rollers or immersed bearings
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003—Apparatus
    • C23C2/0035—Means for continuously moving substrate through, into or out of the bath
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003—Apparatus
    • C23C2/0036—Crucibles

Definitions

  • the present invention relates to a method for operating a hot metallization furnace for metal strands, in particular metal strips, in which the metal strand to be coated is passed from above through the upper region of a melt of a coating material contained in a melting container, the melting container being arranged by means of a partial coil arranged axially one above the other articulated induction coil is heatable, and in the case of hot metallizing, by switching on only the upper part coil (s), only a bath movement is generated in the upper region of the melt, while for removing deposits, in particular hard zinc deposits, from the melting vessel in the lower region of the melt by switching on lower coil (s) a bath movement is generated.
  • a hot-dip metallization furnace is known, the crucible of which is surrounded on the outside by a cylindrical induction coil, which is composed of several superposed arranged sub-coils.
  • the depth of the crucible should be equal to or greater than its diameter.
  • the metal melt can thus be heated inductively to a sufficient extent, and the melt can be stirred in the upper region of the container.
  • the movement of the melt should become increasingly weaker towards the lower container area, so that hard zinc deposits or the like settle in the lower crucible area, remain there and are not torn up during the metallization process, which would have disadvantages in terms of the quality of the strip surface .
  • the present invention has for its object to improve the operation of a hot metallization furnace with inductive heating, wherein in the upper part of the melt during the hot metallization process at high power concentration only a small stirring effect, for removing the hard zinc deposits and the like. But achieves a particularly intensive stirring of the melt shall be.
  • This object is achieved according to the invention in a method of the type mentioned at the outset in that the upper (s) sub-coil (s) are / are connected in one phase to a medium-frequency power source during hot metallization; that in order to remove the deposits accumulated in the lower region of the melting vessel, the lower sub-coil (s) are connected to a mains frequency current source in a rotational manner; and that swirled deposits are then removed from the melt by means of a collecting trough.
  • the method according to the invention achieves, on the one hand, that the bath movement during the heating phase during the metallization is relatively small and is only present in the upper part of the molten coating metal, so that a good delimitation between an upper swirled area and a non-swirled lower area of the melted area Metal is reached.
  • a particularly intensive bath swirl is generated. This ensures that the deposits in the bottom region of the melting vessel are whirled up and distributed approximately uniformly over the entire height of the melting bath. After immersing the drip pan in the molten metal, the whirled up particles can settle in this drip pan.
  • the method according to the invention can be further developed in an advantageous manner in that, in order to remove the deposits, lower and upper partial coils are connected in terms of torque to a mains frequency current source. This accelerates and intensifies the build-up of deposits.
  • a metal strip 6 to be coated is passed over a deflection roller 7 into a melt 8 of a coating material, from which it is then led out upwards via a deflection roller 9 and fed to a further treatment. Before being immersed in the melt 8, the metal strip 6 is pulled through a cleaning and heating process.
  • the deposits accumulating in the lower region of the crucible 2 during a longer operating time of the furnace are designated 10.
  • the partial coils 3 and 4 are connected to a medium-frequency AC network 13 via contactors 11 and 12.
  • the melt 8 is thereby intensively heated with a moderate bath movement.
  • only one of the two partial coils 3 and 4 can be switched on.
  • coil section 3 is generally supplied with current alone.
  • all sub-coils 3, 4 and 5 are connected to a mains frequency three-phase network 15 via switch contacts of a contactor 14 in the embodiment shown in the drawing so that a connecting terminal of each sub-coil 3, 4 and 5 with a phase of Mains frequency three-phase network 15 connected and the other terminals of the coil sections are led to a common star point.
  • the contactors 11 and 12 have interrupted the energy supply from the medium-frequency AC network 13 to the sub-coils 3 and 4.
  • the collecting vessel together with the deposits is then pulled out of the crucible 2. Production of the furnace system can now be resumed without major delays.

Abstract

Dans un procédé d'utilisation d'un four de liquéfaction de fonte pour barres de métal, notamment des bandes de métal, les barres de métal devant être recouvertes d'une couche sont transportées par en haut à travers la région supérieure d'un matériau fondu de recouvrement contenu dans un récipient de fusion, qui peut être chauffé par une bobine d'induction subdivisée en bobines partielles superposées axialement. Au cours de la liquéfaction de fonte, la ou les bobines partielles supérieures sont branchées en monophasé à une source de courant de fréquence moyenne. Afin d'éliminer les sédiments recueillis dans la partie inférieure du canal de fusion, la ou les bobines partielles inférieures sont branchées à une source de courant triphasé de fréquence standard. Les sédiments soustraits par tourbillon sont alors retirés de la fonte à l'aide d'un récipient collecteur.In a method of using a cast iron liquefaction furnace for metal bars, especially bands of metal, the metal bars to be coated with a layer are transported from above through the upper region of a material. cover melt contained in a melting vessel, which can be heated by an induction coil subdivided into axially stacked partial coils. During the liquefaction of cast iron, the upper partial coil (s) are connected in single phase to a current source of medium frequency. In order to remove the sediment collected in the lower part of the fusion channel, the lower partial coil (s) are connected to a three-phase current source of standard frequency. The sediments removed by vortex are then removed from the melt using a collecting vessel.

Description

Verfahren zum Betreiben eines Heißmet allisierungsofens ========== ========== ========== ========== ============ Method of operating a hot metal furnace ========== ========== ========== ========== ==== ========
Beschreibungdescription
Die vorliegende Erfindung betrifft ein Verfahren zum Betreiben eines Heißmetallisierungsofens für Metallstränge, insbesondere Metallbänder, bei dem der zu beschichtende Metallstrang von oben her durch den oberen Bereich einer Schmelze eines in einem Schmelzbehälter enthaltenen Beschichtungsmaterials hindurchgeführt wird, wobei der Schmelzbehälter mittels einer in axial übereinander angeordnete Teilspulen gegliederten Induktionsspule beheizbar ist, und bei dem beim Heißmetallisieren durch Einschalten allein der oberen Teilspule(n) lediglich im oberen Bereich der Schmelze eine Badbewegung erzeugt wird, während zum Entfernen von Ablagerungen, insbesondere Hartzinkablagerungen, aus dem Schmelzgefäß im unteren Bereich der Schmelze durch Einschalten der unteren Teilspule(n) eine Badbewegung erzeugt wird.The present invention relates to a method for operating a hot metallization furnace for metal strands, in particular metal strips, in which the metal strand to be coated is passed from above through the upper region of a melt of a coating material contained in a melting container, the melting container being arranged by means of a partial coil arranged axially one above the other articulated induction coil is heatable, and in the case of hot metallizing, by switching on only the upper part coil (s), only a bath movement is generated in the upper region of the melt, while for removing deposits, in particular hard zinc deposits, from the melting vessel in the lower region of the melt by switching on lower coil (s) a bath movement is generated.
Aus der DE-PS 34 28 999 ist ein Heißtauchmetallislerungsofen bekannt, desnen Tiegel außen von einer zylindrischen Induktionsspule umgeben ist, die aus mehreren übereinander ange ordneten Teilspulen besteht. Dabei soll die Tiefe des Tiegels gleich oder größer als dessen Durchmesser. Beim Heißmetallisieren mit diesem bekannten Ofen sollen lediglich die ob eren Teilspulen eingeschaltet werden. Damit kann die Metallschmelze in ausreichendem Maße induktiv erhitzt werden, und es kann ein Durchrühren der Schmelze im oberen Behälterbereich stattfinden. Die Bewegung der Schmelze soll zum unteren Behälterbereich hin zunehmend schwächer werden, so daß sich Hartzinkablagerungen oder dergl. im unteren Tiegelbereich absetzen, dort verbleiben und nicht während des Metallisierungsprozesses nach oben gerissen werden, was Nachteile in Bezug auf die Qualität der Bandoberfläche nach sich ziehen würde.From DE-PS 34 28 999, a hot-dip metallization furnace is known, the crucible of which is surrounded on the outside by a cylindrical induction coil, which is composed of several superposed arranged sub-coils. The depth of the crucible should be equal to or greater than its diameter. When hot metallizing with this known furnace, only the partial coils should be switched on. The metal melt can thus be heated inductively to a sufficient extent, and the melt can be stirred in the upper region of the container. The movement of the melt should become increasingly weaker towards the lower container area, so that hard zinc deposits or the like settle in the lower crucible area, remain there and are not torn up during the metallization process, which would have disadvantages in terms of the quality of the strip surface .
Die mit längerer Betriebszeit zunehmenden Ablagerungen im unteren Tiegelbereich müssen von Zeit zu Zeit entfernt werden. Für diesen Zweck wird gemäß DE-PS 34 28 999 vorgeschlagen, auch die untere Teilspule zu beaufschlagen. Dadurch werden die Hartzinkablagerungen oder dergl. hochgewirbelt.The deposits in the lower crucible area that increase with longer operating times must be removed from time to time. For this purpose, it is proposed according to DE-PS 34 28 999 to also act on the lower coil section. As a result, the hard zinc deposits or the like are whirled up.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, die Betriebsweise eines Heißmetallisierungsofens mit induktiver Beheizung noch zu verbessern, wobei im oberen Teil der Schmelze beim Heißmetallisierungsvorgang bei hoher Leistungskonzentration nur ein geringer Rühreffekt, zum Entfernen der Hartzinkablagerungen und dergl. aber eine besonders intensive Durchrührung der Schmelze erzielt werden soll.The present invention has for its object to improve the operation of a hot metallization furnace with inductive heating, wherein in the upper part of the melt during the hot metallization process at high power concentration only a small stirring effect, for removing the hard zinc deposits and the like. But achieves a particularly intensive stirring of the melt shall be.
Diese Aufgabe wird bei einem Verfahren der eingangs erwähnten Art erfindungsgemäß dadurch gelöst, daß beim Heißmetallisieren die obere(n) Teilspule(n) einphasig an eine Mittelfrequenz-Stromquelle angeschlossen wird/werden; daß zum Entfernen der im unteren Bereich des Schmelzgefäßes angesammelten Ablagerungen die untere(n) Teilspule(n) drehs trommäßig mit einer Netzfrequenz-Stromquelle verbunden werden; und daß dann aufgewirbelte Ablagerungen mittels einer Auffangwanne der Schmelze entnommen werden. Durch das Verfahren gemäß der Erfindung wird einerseits erreicht, daß die Badbewegung während der Heizphase beim Metallisieren relativ gering und dabei nur im oberen Teil des schmelzflüssigen Beschichtungsmetalls vorhanden ist, so daß eine gute Abgrenzung zwischen einem oberen durchgewirbelten Bereich und einem nicht durchgewirbelten unteren Bereich des schmelzflüssigen Metalls erreicht wird.This object is achieved according to the invention in a method of the type mentioned at the outset in that the upper (s) sub-coil (s) are / are connected in one phase to a medium-frequency power source during hot metallization; that in order to remove the deposits accumulated in the lower region of the melting vessel, the lower sub-coil (s) are connected to a mains frequency current source in a rotational manner; and that swirled deposits are then removed from the melt by means of a collecting trough. The method according to the invention achieves, on the one hand, that the bath movement during the heating phase during the metallization is relatively small and is only present in the upper part of the molten coating metal, so that a good delimitation between an upper swirled area and a non-swirled lower area of the melted area Metal is reached.
Andererseits wird zum Entfernen der Hartzinkablagerungen und dergl. aus dem Bodenbereich des Schmelzgefäßes eine be s o nde r s intensive Baddurchwirbelung erzeugt. Dadurch wird erreicht, daß die Ablagerungen im Bodenbereich des Schmelzgefäßes aufgewirbelt und über die gesamte Schmelzbadhöhe in etwa gleichmäßig verteilt werden. Nach dem Eintauchen der Auffangwanne in die Metallschmelze können sich die aufgewirbelten Partikel in di e s e r Auffangwanne absetzen.On the other hand, to remove the hard zinc deposits and the like from the bottom region of the melting vessel, a particularly intensive bath swirl is generated. This ensures that the deposits in the bottom region of the melting vessel are whirled up and distributed approximately uniformly over the entire height of the melting bath. After immersing the drip pan in the molten metal, the whirled up particles can settle in this drip pan.
Das erfindungsgemäße Verfahren kann dadurch in vorteilhafter Weise weitergebildet werden, daß zum Entfernen der Ablagerungen untere und obere Teilspulen drehs trommäßig mit einer Netzfrequenz-Stromquelle verbunden werden. Damit wird das Aufwirbeln von Ablagerungen noch beschleunigt und verstärkt.The method according to the invention can be further developed in an advantageous manner in that, in order to remove the deposits, lower and upper partial coils are connected in terms of torque to a mains frequency current source. This accelerates and intensifies the build-up of deposits.
An Hand eines Ausführungsbeispieles wird die Erfindung nun näher erläutert:The invention will now be explained in more detail using an exemplary embodiment:
Mit 1 ist ein Heißtauchmetallislerungsof en bezeichnet, der einen gestampften Tiegel 2 und diesen umgebende Teilspulen 3, 4 und 5 aufweist. Ein zu beschichtendes Metallband 6 wird über eine Umlenkrolle 7 in eine Schmelze 8 eines Beschichtungsmaterials geleitet, aus dem es dann über eine Umlenkrolle 9 nach oben herausgeführt und einer weiteren Behandlung zugeführt wird. Vor dem Eintauchen in die Schmelze 8 wird das Metallband 6 einem Reinigungs-und Aufheizprozeß un t er z o g en. Die sich bei einer längeren Betriebszeit der Ofenanlage im unteren Bereich des Tiegels 2 ansammelnden Ablagerungen s ind mit 10 bezeichnet.1 with a hot-dip metallization furnace is designated, which has a stamped crucible 2 and the partial coils 3, 4 and 5 surrounding it. A metal strip 6 to be coated is passed over a deflection roller 7 into a melt 8 of a coating material, from which it is then led out upwards via a deflection roller 9 and fed to a further treatment. Before being immersed in the melt 8, the metal strip 6 is pulled through a cleaning and heating process. The deposits accumulating in the lower region of the crucible 2 during a longer operating time of the furnace are designated 10.
Während der Metallisierungsphase werden die Teilspulen 3 und 4 über Schaltschütze 11 und 12 an ein Mittelfrequenz-Wechselstromnetz 13 angeschlossen. Die Schmelze 8 wird dadurch bei mäßiger Badbewegung intensiv beheizt. Je nach dem Energiebedarf der Schmelze kann auch nur eine der beiden Teilspulen 3 und 4 eingeschaltet sein.During the metallization phase, the partial coils 3 and 4 are connected to a medium-frequency AC network 13 via contactors 11 and 12. The melt 8 is thereby intensively heated with a moderate bath movement. Depending on the energy requirement of the melt, only one of the two partial coils 3 and 4 can be switched on.
Sind die Ablagerungen 10 am Tiegelboden im Laufe des Heißmetallisierungsprozesses soweit angewachsen, daß die Gefahr des Aufwirbeins dieser Ablagerungen durch das elektrische Feld der Teilspule 4 besteht, dann wird in der Regel die Teilspule 3. allein mit Strom beaufschlagt.If the deposits 10 on the crucible bottom have grown to such an extent in the course of the hot metallization process that there is a risk of these deposits being raised by the electric field of the coil section 4, then coil section 3 is generally supplied with current alone.
Zum Entfernen der Ablagerungen 10 vom Tiegelboden werden über Schaltkontakte eines Schaltschützes 14 bei dem in der Zeichnung dargestellten Ausführungsbeispiel alle Teilspulen 3, 4 und 5 an ein Netzfrequenz-Drehstromnetz 15 so angeschlossen, daß eine Anschlußklemme jeder Teilspule 3, 4 und 5 mit einer Phase des Netzfrequenz-Drehstromnetzes 15 verbunden und die anderen Anschlußklemmen der Teilspulen zu einem gemeinsamen Sternpunkt geführt werden. Die Schaltschütze 11 und 12 haben dabei die Energiezufuhr von dem Mittelfrequenz-Wechselstromnetz 13 zu den Teilspulen 3 und 4 unterbrochen.To remove the deposits 10 from the bottom of the crucible, all sub-coils 3, 4 and 5 are connected to a mains frequency three-phase network 15 via switch contacts of a contactor 14 in the embodiment shown in the drawing so that a connecting terminal of each sub-coil 3, 4 and 5 with a phase of Mains frequency three-phase network 15 connected and the other terminals of the coil sections are led to a common star point. The contactors 11 and 12 have interrupted the energy supply from the medium-frequency AC network 13 to the sub-coils 3 and 4.
Durch den Anschluß aller Teilspulen 3, 4 und 5 an das Netzfrequenz-Drehstromnetz 15 in der vorgenannten Weise wird eine intensive Durchwirbelung der Schmelze 8 und damit auch der Ablagerungen 10 am Tiegelboden bewirkt. Nach einer ca. 10 bis 15 Minuten andauernden Durchwirbelungsphase werden alle drei Teilspulen 3, 4 und 5 über das Schaltschütz 14 abgeschaltet. Sodann wird in die Schmelze 8 ein in der Zeichnung nicht dargestelltes wannenförmiges Auffanggefäß abgesenkt, das wenigstens den größten Teil der in der Schmelze 8 wieder nach unten absinkenden Teilchen, z. B. Hartzink-Teilchen, aufnimmt.By connecting all the coils 3, 4 and 5 to the mains frequency three-phase network 15 in the aforementioned manner, an intensive swirling of the melt 8 and thus also the deposits 10 on the crucible bottom is effected. After a swirling phase lasting approximately 10 to 15 minutes, all three sub-coils 3, 4 and 5 are switched off via the contactor 14. Then a trough-shaped collecting vessel (not shown in the drawing) is lowered into the melt 8, which contains at least the majority of the particles that sink down again in the melt 8, e.g. B. hard zinc particles.
Danach wird das Auffanggefäß samt den Ablagerungen aus dem Tiegel 2 herausgezogen. Ohne größere Verzögerungen kann nun die Produktion der Ofenanlage wieder aufgenommen werden. The collecting vessel together with the deposits is then pulled out of the crucible 2. Production of the furnace system can now be resumed without major delays.

Claims

AnsprücheExpectations
1- Verfahren zum Betreiben eines Heißmetallisierungsofens für Metallstränge, insbesondere Metallbänder, bei dem der zu beschichtende Metallstrang von oben her. durch den oberen Bereich einer Schmelze eines in einem Schmelzbehälter enthaltenen Beschichtungsmaterials hindurchgeführt wird, wobei der Schmelzbehälter mittels einer in axial übereinander angeordnete Teilspulen gegliederten Induktionsspule beheizbar ist, und bei dem beim Heißmetallisieren durch Einschalten allein der oberen Teilspule(n) lediglich im oberen Bereich der Schmelze eine Badbewegung erzeugt wird, während zum Entfernen von Ablagerungen, insbesondere Hartzinkablagerungen, aus dem Schmelzgefäß im unteren Bereich der Schmelze durch Einschalten der unteren Teilspule(n) eine Badbewegung erzeugt wird, d as d u r c h g e k e n n z e i c h n e t,1- Method for operating a hot metallization furnace for metal strands, in particular metal strips, in which the metal strand to be coated from above. is passed through the upper region of a melt of a coating material contained in a melting container, the melting container being heatable by means of an induction coil divided into axially arranged partial coils, and in the case of hot metallization by switching on only the upper partial coil (s) only in the upper region of the melt a bath movement is generated, while for removing deposits, in particular hard zinc deposits, a bath movement is generated in the lower region of the melt by switching on the lower part coil (s), which is characterized by,
daß beim Heißmetallisieren die obere(n) Teilspule(n) einphasig an eine Mittelfrequenz-Stromquelle angeschlossen wird/ werden,that the upper coil (s) is / are connected in one phase to a medium frequency power source during hot plating,
daß zum Entfernen der im unteren Bereich des Schmelzgefäßes angesammelten Ablagerungen die untere(n) Teilspule(n) drehstrommäßig mit einer Netzfrequenz-Stromquelle verbunden werden undthat in order to remove the deposits accumulated in the lower region of the melting vessel, the lower (n) sub-coil (s) are connected in terms of three-phase current to a mains frequency power source and
daß dann aufgewirbelte Ablagerungen mittels einer Auffangwanne der Schmelze entnommen werden.that swirled deposits are then removed from the melt by means of a collecting trough.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß zum Entfernen der Ablagerungen untere und obere Teilspulen: drehs trommäßig mit einer Netzfrequenz-Stromquelle verbunden werden. 2. The method according to claim 1, characterized in that to remove the deposits lower and upper coil sections: rotationally connected to a mains frequency power source.
EP88901021A 1987-02-03 1988-01-26 Process for operating hot metallization ovens Expired - Lifetime EP0346341B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88901021T ATE65553T1 (en) 1987-02-03 1988-01-26 METHOD OF OPERATING A HOT METALLIZING FURNACE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873703108 DE3703108A1 (en) 1987-02-03 1987-02-03 METHOD FOR OPERATING A HOT METALIZING OVEN
DE3703108 1987-02-03

Publications (2)

Publication Number Publication Date
EP0346341A1 true EP0346341A1 (en) 1989-12-20
EP0346341B1 EP0346341B1 (en) 1991-07-24

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EP88901021A Expired - Lifetime EP0346341B1 (en) 1987-02-03 1988-01-26 Process for operating hot metallization ovens

Country Status (5)

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US (1) US5135781A (en)
EP (1) EP0346341B1 (en)
JP (1) JPH072982B2 (en)
DE (2) DE3703108A1 (en)
WO (1) WO1988005831A1 (en)

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Also Published As

Publication number Publication date
JPH02502102A (en) 1990-07-12
DE3703108A1 (en) 1988-08-11
JPH072982B2 (en) 1995-01-18
WO1988005831A1 (en) 1988-08-11
DE3703108C2 (en) 1989-03-09
DE3863924D1 (en) 1991-08-29
EP0346341B1 (en) 1991-07-24
US5135781A (en) 1992-08-04

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