WO2005010229A1 - Procede et dispositif de revetement d'une bande metallique par immersion a chaud - Google Patents

Procede et dispositif de revetement d'une bande metallique par immersion a chaud Download PDF

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Publication number
WO2005010229A1
WO2005010229A1 PCT/EP2004/008170 EP2004008170W WO2005010229A1 WO 2005010229 A1 WO2005010229 A1 WO 2005010229A1 EP 2004008170 W EP2004008170 W EP 2004008170W WO 2005010229 A1 WO2005010229 A1 WO 2005010229A1
Authority
WO
WIPO (PCT)
Prior art keywords
metal strip
nozzle
suction device
coating
stripping
Prior art date
Application number
PCT/EP2004/008170
Other languages
German (de)
English (en)
Inventor
Heinrich Pannenbecker
Hermann Erwig
Wilhelm DÜRR
Joachim HÜLSTRUNG
Bert-Heiner Willeke
Original Assignee
Thyssenkrupp Steel Ag
Duma Maschinen- Und Anlagenbau 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 Thyssenkrupp Steel Ag, Duma Maschinen- Und Anlagenbau Gmbh filed Critical Thyssenkrupp Steel Ag
Publication of WO2005010229A1 publication Critical patent/WO2005010229A1/fr

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
    • C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
    • C23C2/18—Removing excess of molten coatings from elongated material
    • C23C2/20—Strips; Plates

Definitions

  • the invention relates to a method for hot-dip coating of metal strip, in which the metal strip to be coated is moved through a melt bath and the still molten metallic coating present on a surface of the metal strip after leaving the melt bath by means of a gas stream applied from at least one stripping nozzle to a desired thickness the coating finally remaining on the surface hit by the gas stream is blown off the metal strip.
  • the invention also relates to a device for hot-dip coating of metal strip, with a melting vessel for holding molten coating metal and with at least one stripping nozzle which directs a gas stream onto the metal strip which emerges from the melting vessel and is coated with the coating metal, in order to remove the metal strip present on the surface of the metal strip to blow off still molten coating metal from the metal strip up to a desired thickness of the coating finally remaining on the surface hit by the gas stream.
  • the strip to be coated is annealed in a continuous furnace and then passed through a melt bath.
  • the melt pool liquid coating metal taken from the tape adheres to the tape surface.
  • the desired thickness of the coating metal is then usually set by means of a pair of gas nozzles that extend linearly across the width of the strip.
  • a gas stream usually an air stream, is directed from the gas nozzles onto the surfaces of the metal strip, through which the excess, still liquid layer is deliberately reduced by blowing the coating material that is not required from the strip.
  • the invention was based on the object of creating a method and a device, the operation of which produces as little slag as possible while maintaining the desired wiping action, while at the same time the surface of the coated strip detectable, streak-related errors should be reduced to a minimum.
  • this object is achieved in that the gas stream flowing off the respective surface of the metal strip is sucked off by means of a suction device arranged near the wiping nozzle and near the surface of the metal strip.
  • a suction device is assigned to the stripping nozzle, which is arranged near the stripping nozzle and near the metal strip by one of the respective ones Extract the surface of the gas stream flowing out of the metal strip.
  • the gas stream striking the strip surface is sucked off near the strip surface.
  • the gas stream is instead discharged in a controlled manner, if possible immediately after the gas stream has impinged on the strip surface assigned to it. The occurrence of surface defects and the risk of excessive oxidation of the coating material are thus reduced to a minimum.
  • the distance between the suction device and the assigned belt surface should be set in such a way that the distance between the belt and the suction is large enough to safely prevent liquid metal particles from being sucked into the suction device. Sucking in solidified dust particles, as they arise in the conventional method, however, is desirable. These solid particles are deposited on the coated tape in a conventional manner and reduce the quality of the coated surface. They also cause a certain environmental impact in the area of the coating bath.
  • a “close arrangement” is understood according to the invention to mean a positioning of the suction device which is so close to the belt surface that the gas jet emerging from the stripping nozzle and deflected on the belt surface in and against the direction of the belt is reliably prevented from the suction of the belt Suction nozzle is detected before it enters the more distant general environment of the wiper nozzle as an undirected, diffuse gas flow.
  • the suction device is arranged in the conveying direction of the belt behind the stripping nozzle, it has proven to be advantageous proven if the distance between the nozzle opening and the strip, which is also determined as solder on the strip surface, is not more than 300 mm.
  • the somewhat further spaced arrangement of a suction device positioned behind the stripping nozzle in the conveying direction has proven to be expedient, because in practice this can cause the stripping gas flow to swirl in the immediate vicinity of the stripping nozzle.
  • the swirled gas stream increasingly tends to drag coating particles with it. At the same time, it takes up a larger volume due to the turbulence.
  • the minimum distance between the suction device and the assigned belt surface should not be less than 10 mm.
  • the suction device used according to the invention is preferably designed in such a way that it sucks over the entire bandwidth.
  • the suction device can be adjusted in accordance with the respective mode of operation of the coating system be optimally positioned. The adjustability can thereby be facilitated that the suction device is coupled to the stripping nozzle in such a way that when the position of the stripping nozzle changes, the position of the suction device also changes.
  • a particularly practical embodiment of the invention is characterized in that the nozzle of the suction device is designed in the manner of a slot nozzle. With such a nozzle, the stripping gas flowing over the belt surface can be reliably detected over the entire width of the belt.
  • an embodiment of the invention that is particularly advantageous in terms of adaptability to a large product range is characterized in that the width of the slot nozzle opening is adjustable.
  • a further embodiment of the invention which contributes to the respectively optimized adaptation of the effect of the suction device used according to the invention is characterized in that at least the nozzle of the suction device can be pivoted about an axis arranged parallel to the surface of the belt conveyed in the area of the suction device.
  • the angle at which the 'suction of the suction device detects the Abstreifgasströmung can be easily adjusted so that, taking into account the geometry and flow patterns in the overall device an optimal effect at all times of the suction i-st.
  • a further particularly practical embodiment of the invention provides that the extracted gas volume flow is dimensioned such that a residual gas flow remains from the gas flow inflated onto the metal strip, which remains above the surface of the metal strip struck by the gas stream is painted.
  • the suction power can be automatically adjusted to the performance of the wiping nozzles by means of a controlled suction fan.
  • the suction power can be adjusted so that enough residual gas still flows onto the metal bath surface to keep the remaining coating slag away from the emerging strip.
  • the gas stream is passed according to a further advantageous variant of the invention through a filter in which the foreign bodies entrained by the gas stream are filtered out. They can then be sent for recycling.
  • the suction device according to the invention is also designed so that it can be easily removed.
  • the stripping nozzles can also be operated without a suction device if required or in the event of maintenance.
  • the suction device can be arranged in such a way that optimal suction is achieved taking into account the special features of the system technology available in each case.
  • the ease of assembly and disassembly can be supported in that the suction device is arranged loosely hanging on a holding element.
  • Figure 1 shows a device for hot dip coating of metal strip in a side view.
  • Fig. 2 in the device shown in Fig. 1 scraper nozzles and suction devices.
  • the device 1 is used for hot-dip coating of metal strip 2, for example a 'steel strip which passes through the apparatus 1 in a continuous flow.
  • metal strip 2 Before entering the device 1, the metal strip 2 is annealed in a continuous furnace 3 in order to bring it to the optimum bath entry temperature for optimal wetting with the molten coating metal to be applied to the metal strip 2.
  • the device 1 comprises a melt vessel 4, into which the metal strip 2 comes in coming from the continuous furnace 3.
  • the metal strip 2 is guided through a channel 5 which seals off the metal strip 2 from the surroundings.
  • a melt bath 5 formed from molten coating metal is contained in the melt vessel 4.
  • the coating metal can be, for example, a zinc alloy, as is usually used for the coating of steel strips.
  • the metal strip 2 is deflected on a roller 6 in such a way that it emerges from the melt bath 5 in a vertical conveying direction F directed from bottom to top.
  • the surface 2 "of the metal strip 2 is assigned to the side of the metal strip 2.
  • the respective distance h between the suction devices 8 ', 8" and the upper edge of the melt vessel 4 or the region 7 of the exit of the metal strip 2 from the melt bath 5 can be shown with the aid of a not shown Setting device can be set.
  • the respective distance v between the suction nozzle opening of the suction devices 8 ', 8 "and the band surface 2' or 2" assigned to them can be adjusted.
  • a pair of wiping nozzles 9', 9" is arranged, of which one is also assigned to one surface 2 'and the other to the other surface 2 "of the metal strip 2
  • the gas applied to the surface 2 'or 2 "by the stripping nozzles 9', 9” can be, for example, air or nitrogen or a mixture of these two gases.
  • a further pair of suction devices 10 ', 10 " is arranged behind the stripping nozzles 9', 9" in the conveying direction F in the same way as the suction devices 8 ', 8 ".
  • the suction devices 10', 10" are also spaced from the melt vessel 4 and to the surfaces 2 ', 2 "of the metal strip 2 assigned to them in each case are adjustable.
  • the wiping nozzles 9 ', 9 are each carried by a crossmember 11', 11" which extends across the width of the metal strip 2.
  • a second crossmember 12 ', 12 "extends parallel to the crossmember 11', 11” and is made from a hollow profile with a rectangular cross section.
  • the cross members 12', 12 On their side facing away from the stripping nozzles 9 ', 9 ", the cross members 12', 12” have openings 13 ', 13 "distributed at regular intervals across the width of the cross members 12', 12".
  • the free end of a substantially horizontally extending bolt 20 ', 20 ", the other end of which is firmly connected to a support profile 14', 14" sits with play in the openings 13 ', 13 ". 20 "pushed on, in the assembled state between the respective support profile 12 ', 12” and the associated cross member 12', 12 ".
  • Arranged spacer rings 15 ', 15” is the horizontal distance of the support profile 1', 14 "from the respective cross member 12 ', 12 "set.
  • the support profiles 1 ', 14 each carry a suction pipe 16', 16" extending in the horizontal direction parallel to the metal strip 2.
  • the suction pipes 16 ', 16 are part of the respective suction device 8', 8", which in Delivery direction F are arranged in front of the stripping nozzles 9 ', 9 ".
  • the suction pipes 16 ′, 16 ′′ form a pivot axis A, which likewise extends parallel to the strip surface, for the nozzle section 17 ′, 17 ′′ of the respective suction device 8 ′, 8 ′′, each designed in the manner of a slot nozzle and extending over the width of the metal strip 2 Swiveling around the axis A, the angle at which the suction directed into the respective nozzle opening 18 ', 18 "of the suction devices 8', 8" can be aligned so that an optimal effect is ensured.
  • the open width of the nozzle opening 18 ', 18 "of the nozzle section 17', 17" can be adjusted to the width of the strip being processed by means of a slide (not shown).
  • the distance v measured horizontally as a plumb line on the strip surface is 10 mm to 100 mm.
  • the gas stream G a sucked off by the suction devices 8 ′, 8 ′′ is fed to the preparation via further pipes connected to the respective suction pipe 16 ′, 16 ′′.
  • the respective nozzle opening 19', 19" is not at right angles with a slight angular deviation to the respectively assigned surface of the Metal strip 2 directed, but aligned with greater angular deviation so that the suction generated by them also those in the space above the stripping nozzles 9 ', . 9 "swirled gases G and particles are reliably detected.
  • the distance v between the respective nozzle openings 19 ', 19 “ is between 10 mm and 300 mm.
  • the nozzle openings 19', 19" are designed further than the nozzle openings 18 ', 19 "in order to reliably detect larger, less rapidly flowing gas volumes G a ,
  • the gas streams G ', G "striking the surface 2', 2" of the metal strip 2 are deflected on the surface 2 ', 2 "and are distributed close to the surface over the respective surface 2' or 2". Gas flowing downward in the direction of the melt vessel 4 is sucked off by the suction devices 8 ', 8 ".
  • Their performance and their orientation in relation to the metal strip 2 are set such that the suction devices 8', 8" do not fully flow in the direction of the Aspirate melt bath 5 flowing gas stream, but leave a small fraction G r on the metal strip 2.
  • This fraction G r of the gas flow G flows to the region 7 of the exit of the metal strip 2 from the melt bath 5 and prevents there, on the bath surface, from floating slag on the surfaces 2 ', 2 "of the metal strip 2 as it exits the melt bath 5 ,
  • the part of the gas streams G ', G "which flows upward in the direction of the suction devices 10', 10" which may be present is sucked off by them.
  • the power of the suction devices 10 ′, 10 ′′ is dimensioned such that the part of the gas stream G flowing in their direction is completely suctioned off.
  • the suctioned gas streams G a take away the solid metal particles which are inevitably present above the surfaces 2 ', 2 "and which are formed by coating metal detached from the metal strip 2. These metal particles to recover, the extracted gas flows G a are passed through filters or separators, not shown here.
  • the modular structure of the device 1 makes it possible to maintain or replace the suction devices 8 ', 8 “, 10', 10" and the scraping nozzles 9 ', 9 "in a particularly simple manner.
  • the suction devices 8' can easily be replaced. , 8 “, 10 ', 10” during operation or to optimize their setting by changing their height h above the melt bath 5 or their distance v from the surface 2' or 2 ".
  • the distance v is adjusted in such a way that on the one hand the gas flow G a to be discharged by the suction devices 8 ', 8 ", 10', 10" is reliably detected and on the other hand it is ensured that the suctioned gas flow G a does not contain any of the still molten, on the metal band 2 adhering coating material entrains.

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

Abstract

L'invention concerne un procédé et un dispositif de revêtement d'une bande métallique (2) par immersion à chaud. La bande métallique (2) à revêtir est déplacée à travers un bain de métal fondu (5). A la sortie de ce bain, le revêtement métallique encore en fusion présent sur une surface (2', 2'') de la bande métallique (2) est éliminé par soufflage au moyen d'un flux de gaz (G', G'') diffusé par au moins une buse de raclage (9', 9'') jusqu'à ce que le revêtement métallique restant sur la surface (2', 2'') de la bande métallique (2) soumise respectivement à l'action du flux de gaz (G', G'') présente l'épaisseur voulue. L'objectif de l'invention est de conserver l'effet de raclage souhaité avec une formation de scories aussi réduite que possible tout en réduisant au minimum les défauts apparaissant sur la surface de la bande revêtue en raison du raclage. A cet effet, le flux de gaz (G', G'') s'écoulant de la surface respective (2', 2'') de la bande métallique (2) est aspiré au moyen d'un dispositif d'aspiration (8', 8'' ; 10', 10'') disposé à proximité de la buse de raclage (9', 9'') et à proximité de la surface (2', 2'') de la bande métallique (2).
PCT/EP2004/008170 2003-07-23 2004-07-22 Procede et dispositif de revetement d'une bande metallique par immersion a chaud WO2005010229A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10333766A DE10333766B4 (de) 2003-07-23 2003-07-23 Verfahren und Vorrichtung zum Schmelztauchbeschichten von Metallband
DE10333766.0 2003-07-23

Publications (1)

Publication Number Publication Date
WO2005010229A1 true WO2005010229A1 (fr) 2005-02-03

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ID=34071883

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Application Number Title Priority Date Filing Date
PCT/EP2004/008170 WO2005010229A1 (fr) 2003-07-23 2004-07-22 Procede et dispositif de revetement d'une bande metallique par immersion a chaud

Country Status (2)

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DE (1) DE10333766B4 (fr)
WO (1) WO2005010229A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2028286A1 (fr) * 2007-07-21 2009-02-25 Rasselstein GmbH Procédé de suppression d'un revêtement en excès sur le rebord de bandes d'acier galvanisées revêtues d'un revêtement métallique
EP3827903A1 (fr) 2019-11-29 2021-06-02 Cockerill Maintenance & Ingenierie S.A. Procédé de fabrication d'une bande métallique revêtue présentant un aspect amélioré
WO2023088625A1 (fr) 2021-11-18 2023-05-25 John Cockerill Sa Procédé de fabrication d'une bande métallique revêtue présentant un aspect amélioré et son dispositif d'essuyage

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02163358A (ja) * 1988-12-16 1990-06-22 Sumitomo Metal Ind Ltd ゼロスパングル鋼板の製造方法
JPH0387344A (ja) * 1989-08-30 1991-04-12 Nkk Corp 連続溶融めっきにおけるめっき被膜ならし方法
JPH03120348A (ja) * 1989-10-02 1991-05-22 Nkk Corp 溶融亜鉛めっきにおけるガスワイピング装置
DE4010801A1 (de) * 1990-04-04 1991-10-10 Unitas Sa Vorrichtung zum abstreifen von laufendem bandmaterial
JPH04231448A (ja) * 1990-12-27 1992-08-20 Kawasaki Steel Corp 溶融亜鉛めっき設備のワイピング装置
JPH05140721A (ja) * 1991-11-20 1993-06-08 Mitsubishi Heavy Ind Ltd 溶融亜鉛めつき装置
KR100244636B1 (ko) * 1995-12-23 2000-03-02 이구택 도금강판의 과도금 방지방법

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US4077120A (en) * 1972-07-14 1978-03-07 Bissell, Inc. Dry shaver with floating peripherally supported shear plate
FR2544337B1 (fr) * 1983-04-13 1985-08-09 Ziegler Sa Procede et installation pour le revetement en continu d'une bande a l'aide d'un revetement oxydable
DE3631893A1 (de) * 1986-09-19 1988-03-31 Paul Fontaine Verfahren und vorrichtung zum abstreifen von mit schmelzfluessigem material beschichtetem blech
JP3589085B2 (ja) * 1999-05-07 2004-11-17 Ｊｆｅスチール株式会社 連続溶融金属めっき方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02163358A (ja) * 1988-12-16 1990-06-22 Sumitomo Metal Ind Ltd ゼロスパングル鋼板の製造方法
JPH0387344A (ja) * 1989-08-30 1991-04-12 Nkk Corp 連続溶融めっきにおけるめっき被膜ならし方法
JPH03120348A (ja) * 1989-10-02 1991-05-22 Nkk Corp 溶融亜鉛めっきにおけるガスワイピング装置
DE4010801A1 (de) * 1990-04-04 1991-10-10 Unitas Sa Vorrichtung zum abstreifen von laufendem bandmaterial
JPH04231448A (ja) * 1990-12-27 1992-08-20 Kawasaki Steel Corp 溶融亜鉛めっき設備のワイピング装置
JPH05140721A (ja) * 1991-11-20 1993-06-08 Mitsubishi Heavy Ind Ltd 溶融亜鉛めつき装置
KR100244636B1 (ko) * 1995-12-23 2000-03-02 이구택 도금강판의 과도금 방지방법

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PATENT ABSTRACTS OF JAPAN vol. 0152, no. 59 (C - 0846) 2 July 1991 (1991-07-02) *
PATENT ABSTRACTS OF JAPAN vol. 0153, no. 17 (C - 0858) 13 August 1991 (1991-08-13) *
PATENT ABSTRACTS OF JAPAN vol. 0165, no. 81 (C - 1012) 21 December 1992 (1992-12-21) *
PATENT ABSTRACTS OF JAPAN vol. 0175, no. 16 (C - 1112) 17 September 1993 (1993-09-17) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2028286A1 (fr) * 2007-07-21 2009-02-25 Rasselstein GmbH Procédé de suppression d'un revêtement en excès sur le rebord de bandes d'acier galvanisées revêtues d'un revêtement métallique
EP3827903A1 (fr) 2019-11-29 2021-06-02 Cockerill Maintenance & Ingenierie S.A. Procédé de fabrication d'une bande métallique revêtue présentant un aspect amélioré
WO2021105228A1 (fr) 2019-11-29 2021-06-03 Cockerill Maintenance & Ingenierie S.A. Dispositif et procédé pour la fabrication d'une bande métallique revêtue présentant un aspect amélioré
US11866829B2 (en) 2019-11-29 2024-01-09 John Cockerill S.A. Device and method for manufacturing a coated metal strip with improved appearance by adjusting a coating thickness using gas jet wiping
WO2023088625A1 (fr) 2021-11-18 2023-05-25 John Cockerill Sa Procédé de fabrication d'une bande métallique revêtue présentant un aspect amélioré et son dispositif d'essuyage

Also Published As

Publication number Publication date
DE10333766B4 (de) 2009-01-22
DE10333766A1 (de) 2005-02-17

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