EP1504135A2 - Dispositif de revetement - Google Patents

Dispositif de revetement

Info

Publication number
EP1504135A2
EP1504135A2 EP03749878A EP03749878A EP1504135A2 EP 1504135 A2 EP1504135 A2 EP 1504135A2 EP 03749878 A EP03749878 A EP 03749878A EP 03749878 A EP03749878 A EP 03749878A EP 1504135 A2 EP1504135 A2 EP 1504135A2
Authority
EP
European Patent Office
Prior art keywords
guide
metal strip
coating
coating device
guide magnet
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
EP03749878A
Other languages
German (de)
English (en)
Other versions
EP1504135B1 (fr
Inventor
Wilfried PLÄTZER
Ernst-Werner Schmidt
Alireza Kouscheschi
P. Klaus Becker
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.)
Band Zink GmbH
Original Assignee
Band Zink 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 Band Zink GmbH filed Critical Band Zink GmbH
Publication of EP1504135A2 publication Critical patent/EP1504135A2/fr
Application granted granted Critical
Publication of EP1504135B1 publication Critical patent/EP1504135B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • C23C2/003—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
    • C23C2/34—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
    • C23C2/52—Controlling or regulating the coating processes with means for measuring or sensing
    • C23C2/524—Position of the substrate

Definitions

  • the invention relates to a coating device for coating a metal strip in a melt of a coating metal.
  • Coating devices for metal strip coating are used, for example, for galvanizing metal strips and sheets.
  • the metal strip is pulled through a molten zinc melt at approx. 450 ° C:
  • the metal strip continuously dips down into the zinc melt, is deflected upwards by a rotating shaft in the melt and runs upwards out of the zinc melt.
  • the metal strip lies with its entire surface over a certain length on the rotating shaft and with a certain contact pressure. This will
  • Zinc coating already deposited on the relevant side of the metal strip is partially pressed off again.
  • the still liquid zinc coating is also undesirably changed by stabilizing rollers and other rollers over which the coated metal strip runs.
  • the object of the invention is to provide a coating device with improved coating of a metal strip in a melt of a coating metal.
  • a metal strip guide device for guiding, deflecting and / or stabilizing the metal strip in the melt, which is designed as a magnetic guide with at least one electrical guide magnet for contactless guidance of the metal strip in the melt.
  • the metal strip is guided in the melt of the non-magnetic coating metal without contact, ie without rollers, waves, etc., but solely by the magnetic field generated by the guide magnet, which acts approximately perpendicular to the plane of the metal strip. Due to the contact-free guidance of the metal strip in the melt, the coating of the metal strip with the liquid coating metal is no longer changed by rollers, waves, etc., so that an approximately similar coating of the metal strip with the coating metal is realized on both sides of the metal strip.
  • the electrical guide magnet in the melt of the coating metal is arranged and controlled in such a way that the metal strip is deflected in the melt. By avoiding a wave in the Melting avoids the problems of shaft support in a molten metal.
  • a guide magnet housing is preferably provided, in which the guide magnet is arranged and which consists of a non-magnetic material whose melting point is above 600 ° C.
  • the guide magnet housing encapsulates the guide magnet in the melt of the coating metal and protects it from the high temperatures and the chemically aggressive coating metal melt.
  • the guide magnet housing can be designed, for example, as a stainless steel housing.
  • two mutually opposite guide magnet housings with electrical guide magnets are provided, the guide magnet housings forming a continuous metal band guide gap between them.
  • Guide magnets are thus arranged on both sides of the metal strip, so that the metal strip can be attracted by the respective guide magnets in both directions perpendicular to the metal strip base plane.
  • the guide magnets generate electromagnetic fields in the guide gap, by means of which the coating metal is heated within the guide gap. This enables a particularly high quality coating of the metal strip with the coating metal. There is also liquid melt of the coating metal in the guide gap between the mutually opposite guide magnet housings on both sides of the metal strip running through the guide gap.
  • the guide gap between the two guide magnet housings is preferably of arcuate design, so that the metal strip is deflected in the guide gap. In this way the metal strip is deflected over an arcuate path in the coating metal melt without being able to have a large play in this area. This avoids a strong fluttering movement of the metal strip in the molten metal.
  • the guide device has a sensor for determining the distance of the metal strip from the guide magnet. Furthermore, a control device is provided which controls the strength of the magnetic field generated by the guide magnet as a function of the distance between the metal strip and the guide magnet determined by the sensor. In this way, the distance of the metal strip from the guide device or the guide magnet is kept approximately constant. Deviations from the target distance of the metal strip from the guide device or the guide magnet are immediately detected by the sensor and compensated for by appropriate control of the electrical guide magnet.
  • a gas supply is preferably provided, with which the guide magnet housing is supplied with cooling gas for cooling the guide magnet.
  • the guide magnet designed as an electromagnet has a better efficiency at low working temperatures than at higher temperatures, ie the magnetic field generated is stronger at low working temperatures.
  • the cooling improves the efficiency of the guide magnet, so that a smaller guide magnet can be used.
  • the cooling gas can generate a slight overpressure compared to the static pressure of the coating metal melt in the guide magnet housing, so that if the guide magnet housing leaks, cooling gas flows out, but no liquid coating metal flows into it Guide magnet housing can penetrate. In this way, severe damage to the guide device is avoided.
  • a gas pressure sensor for detecting gas leakage currents can be provided in the guide magnet housing.
  • This can be a pressure sensor, for example, which detects the gas pressure within the guide magnet housing.
  • a pressure drop in the housing would indicate a leak in the guide magnet housing, so that damage to the guide magnet housing can be recognized at an early stage and greater damage can be avoided.
  • the guide magnet housing can preferably be coated in the region of the metal strip guide gap with an emergency running coating, which can be designed, for example, as a ceramic coating. Even if the electromagnetic guiding device fails, the system can be shut down in a controlled manner and immediate destruction of the guiding device is avoided.
  • the guide device can be designed as a deflection device, as a stabilization device or else as a combined deflection and stabilization device.
  • a cleaning device for cleaning the guide gap.
  • the cleaning device can have a scraper which is fastened to a scraper cable and can be pulled through the guide gap through the scraper cable.
  • the cleaning magnet cleans the guide magnet housing in the area of the guide gap, ie scrapes and other deposits are scraped off the housing and led out of the guide gap.
  • the guide train can be rope-like or ribbon-like and consists of a non-magnetic material.
  • FIG. 1 shows a coating device according to the invention with a guide device in a zinc melt in cross section
  • Fig. 2 shows the coating device of Figure 1 in rear view
  • Fig. 3 shows the coating device of Figure 1 with a cleaning device.
  • a coating device 10 is shown in cross section in FIG. 1, which serves to coat a metal strip 12 with the coating metal of the melt 14.
  • the coating metal is zinc, but can also be another metal which is suitable for the described coating device 10 with regard to its magnetic properties. All coating metals are suitable which, because of their magnetic properties, do not influence the magnetic fields generated by guide magnets 34 to such an extent that their effect on the metal strip 12 is reduced in such a way that the effort required to guide the metal strip 12 is not justifiable. In the following we speak of non-magnetic coating metals.
  • the surfaces of both sides of the metal strip 12 are provided with a thin layer of zinc.
  • the zinc melt 14 has a temperature of 450 - 470 ° C.
  • the metal strip 12 is introduced into the melt 14 at an angle of 30-45 degrees to the vertical and deflected upward by a guide device 16, so that the metal strip 12 'is led out of the melt 14 vertically upward again.
  • the guide device 16 is held by two swivel arms 18, as shown in FIG. 2.
  • the swivel arms 18 are pivotably mounted above the melt 14, so that the guide device 16 can be swiveled out of the melt 14 for maintenance or repair if necessary. If necessary, the arms 18 together with the guide device 16 are lifted out of the melt 14 by a crane.
  • the guide device 16 is formed by two guide magnet housings 20, 22, which form a continuous metal strip guide gap 24 between them.
  • the two guide magnet housings 20, 22 are held together laterally by screwed or welded holding parts 25, 26.
  • the holding parts 25, 26 each have a pin which is inserted into a respective holding opening of the swivel arms 18.
  • a supply pipe 28, 29 is fastened to each holding part 25, 26.
  • a cooling gas is supplied to the housings 20, 22 through the supply pipes 28, 29 or the heated cooling gas is removed from the housings 20, 22.
  • the supply pipes 28, 29 also contain electrical signal and control lines.
  • the guiding device 16 is functionally divided into a deflecting part 30 and a stabilizing part 32.
  • the guiding gap 24 has an arcuate shape.
  • the guide gap 24 is straight and vertical educated. While the metal strip 12 is deflected by 135-150 degrees in the region of the deflection part 30, the metal strip 12 is stabilized and calmed with respect to its horizontal fluttering movements in the region of the stabilization part 32.
  • Both guide magnet housings 20, 22 contain a multiplicity of electrical guide magnets 34, by means of which the metal strip 12 is always held approximately in the middle of the guide gap 24.
  • the arrows shown in the guide magnets indicate the direction of the magnetic force acting on the metal strip.
  • the holding parts 25, 26 form magnetic inferences for the guide magnets.
  • a plurality of sensors 36 are also provided, which serve to determine the distance of the metal strip 12 from the respective guide magnets 34 or from the central position in the guide gap 24.
  • the electromagnetic guide magnets 34 are controlled as a function of the distance signals from the sensors 36 by a control device 38 such that the metal strip 12 is always approximately in the middle of the guide gap 24.
  • An alternating field is generated by the guide magnets 34, so that segregation of the melt 14, which may have several components, is excluded.
  • a gas supply 40 supplies the guide magnet housings 20, 22 with the cooling gas. Nitrogen is preferably used as the cooling gas.
  • the two housings 20, 22 have a ceramic emergency running coating in order to ensure that the guide device 16 has an emergency running property in the event of the guide magnets 34 failing. This prevents the guide device 16 from being destroyed if the guide magnet 34 fails.
  • the electromagnetic fields generated by the guide magnets heat the melt more or less in the area of the guide gap 24, depending on the magnetic properties of the melt metal. This ensures that the melt 14 remains liquid in the area of the guide gap 24, which in turn ensures a good coating quality.
  • the contact-free guidance and guidance of the metal strip 12 in the melt 14 of the coating metal results in a coating of equal quality on both sides of the metal strip 12.
  • the coating device 10 of Figures 1 and 2 is supplemented by a cleaning device 50.
  • the cleaning device 50 is essentially formed by two self-contained scraper trains 52 which are guided on both sides of the metal strip 12 through the guide gap 24 and outside of the guide gap 24 run back. Both scraper trains 52 are each driven by a drive roller 54 arranged above the melt.
  • a scraper element 56 is arranged on each scraper train 52 and is fixedly attached to the scraper train 52.
  • Ceramic inserts 58 are provided at each of the two guide gap openings, by means of which the scraper cables 52 are deflected, without causing any significant wear on the guide magnet housings 20, 22.
  • the two drive rollers 54 are set in motion in opposite directions to one another by a corresponding drive.
  • the two scraper trains 52 run with the two scraper elements 56 being carried along top down through the guide gap 24.
  • the scraper elements 56 scrape slag and other deposits in the guide gap 24 from the two opposite housing walls and carry them out of the guide gap 24. In this way, a simple and efficient cleaning device is realized.

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)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
  • Seal Device For Vehicle (AREA)
  • Glass Compositions (AREA)

Abstract

L'invention concerne un dispositif de revêtement (10) servant à appliquer un revêtement sur une bande de métal (12) par immersion dans un bain (14) de métal fondu. Un dispositif de guidage (16) placé dans le bain (14) sert à guider et diriger la bande de métal (12). Selon l'invention, ce dispositif de guidage (16) se présente sous la forme d'un système de guidage magnétique comprenant au moins un aimant de guidage électrique, ce système permettant de guider la bande de métal dans le bain (14) sans contact. Cette configuration rend superflue l'utilisation de galets, d'arbres ou similaire pour guider la bande de métal, ce qui permet d'obtenir une bande de métal (12) présentant un revêtement métallique de meilleure qualité, homogène sur les deux faces de la bande de métal (12).
EP03749878A 2002-05-11 2003-05-08 Dispositif de revetement Expired - Lifetime EP1504135B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE20207446U DE20207446U1 (de) 2002-05-11 2002-05-11 Beschichtungsvorrichtung
DE20207446U 2002-05-11
PCT/EP2003/004822 WO2003095694A2 (fr) 2002-05-11 2003-05-08 Dispositif de revetement

Publications (2)

Publication Number Publication Date
EP1504135A2 true EP1504135A2 (fr) 2005-02-09
EP1504135B1 EP1504135B1 (fr) 2005-09-07

Family

ID=28685422

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03749878A Expired - Lifetime EP1504135B1 (fr) 2002-05-11 2003-05-08 Dispositif de revetement

Country Status (9)

Country Link
US (1) US20050208226A1 (fr)
EP (1) EP1504135B1 (fr)
JP (1) JP2005525233A (fr)
KR (1) KR20050006245A (fr)
CN (1) CN100402692C (fr)
AT (1) ATE304064T1 (fr)
AU (1) AU2003232736A1 (fr)
DE (2) DE20207446U1 (fr)
WO (1) WO2003095694A2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005014878A1 (de) * 2005-03-30 2006-10-05 Sms Demag Ag Verfahren und Vorrichtung zur Schmelztauchbeschichtung eines Metallbandes
JP5584526B2 (ja) * 2010-06-21 2014-09-03 三菱日立製鉄機械株式会社 溶融金属めっき設備の電磁石制振装置
CN116673180B (zh) * 2023-06-07 2025-11-11 青岛兴世达金属有限公司 一种金属工件热浸塑装置

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2731212A (en) * 1953-02-13 1956-01-17 Richard S Baker Polyphase electromagnet strip guiding and tension device
GB1351125A (en) * 1970-04-15 1974-04-24 British Steel Corp Method of and apparatus for controlling a moving metal sheet to conform to a predetermined plane
GB2066786B (en) * 1979-12-26 1983-08-03 Nisshin Steel Co Ltd Method and apparatus for reducing oscillation of running strip
JPS56158863A (en) * 1980-05-14 1981-12-07 Nippon Kokan Kk <Nkk> Changing device for direction of strip in galvanizing vessel
JPH0559511A (ja) * 1991-05-30 1993-03-09 Nippon Steel Corp 鋼帯の溶融亜鉛メツキ設備
DE4242380A1 (de) * 1992-12-08 1994-06-09 Mannesmann Ag Verfahren und Vorrichtung zum Beschichten der Oberfläche von strangförmigem Gut
JP2849528B2 (ja) * 1993-04-22 1999-01-20 新日本製鐵株式会社 鋼帯の溶融亜鉛メッキ設備
DE19535854C2 (de) * 1995-09-18 1997-12-11 Mannesmann Ag Verfahren zur Bandstabilisierung in einer Anlage zum Beschichten von bandförmigem Gut
FR2797277A1 (fr) * 1999-08-05 2001-02-09 Lorraine Laminage Procede et dispositif de realisation en continu d'un revetement de surface metallique sur une tole en defilement
JP2002302315A (ja) * 2001-04-10 2002-10-18 Nkk Corp 非接触通板方向転換装置及び鋼帯の製造方法
US6926733B2 (en) * 2001-08-02 2005-08-09 Boston Scientific Scimed, Inc. Method for enhancing sheet or tubing metal stent radiopacity

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03095694A2 *

Also Published As

Publication number Publication date
WO2003095694A3 (fr) 2004-09-02
EP1504135B1 (fr) 2005-09-07
JP2005525233A (ja) 2005-08-25
US20050208226A1 (en) 2005-09-22
CN100402692C (zh) 2008-07-16
AU2003232736A8 (en) 2003-11-11
DE20207446U1 (de) 2003-09-25
CN1653203A (zh) 2005-08-10
KR20050006245A (ko) 2005-01-15
DE50301160D1 (de) 2005-10-13
WO2003095694A2 (fr) 2003-11-20
AU2003232736A1 (en) 2003-11-11
ATE304064T1 (de) 2005-09-15

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