EP3449029B1 - Vorrichtung zur kontinuierlichen heisstauchbeschichtung eines metallbandes und zugehöriges verfahren - Google Patents

Vorrichtung zur kontinuierlichen heisstauchbeschichtung eines metallbandes und zugehöriges verfahren Download PDF

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Publication number
EP3449029B1
EP3449029B1 EP17719928.8A EP17719928A EP3449029B1 EP 3449029 B1 EP3449029 B1 EP 3449029B1 EP 17719928 A EP17719928 A EP 17719928A EP 3449029 B1 EP3449029 B1 EP 3449029B1
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EP
European Patent Office
Prior art keywords
pouring
casing
strip
coating
liquid metal
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EP17719928.8A
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English (en)
French (fr)
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EP3449029A1 (de
Inventor
José VEG
Didier Dauchelle
Hubert Saint-Raymond
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ArcelorMittal SA
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ArcelorMittal SA
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Priority to PL17719928T priority Critical patent/PL3449029T3/pl
Publication of EP3449029A1 publication Critical patent/EP3449029A1/de
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    • 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
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • 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
    • 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
    • C23C2/0038—Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
    • C23C2/004—Snouts
    • 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
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • 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
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by 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
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/12—Aluminium or alloys based thereon
    • 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
    • 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
    • C23C2/30—Fluxes or coverings on molten baths
    • 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
    • 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
    • C23C2/51—Computer-controlled implementation
    • 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
    • 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
    • C23C2/523—Bath level or amount
    • 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
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/08—Tin or alloys based thereon
    • 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
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/10—Lead or alloys based thereon

Definitions

  • the invention relates to an installation for continuously dipping a metal strip.
  • the demand for patent WO 02/38823 describes a coating installation comprising a sheath for running the metal strip under a protective atmosphere and the lower end of which is immersed in the bath of liquid metal to determine with the surface of the bath and inside the sheath, a seal of liquid metal.
  • the sheath defines, at its lower end, at least two liquid metal discharge compartments, into which liquid metal from the bath pours from the liquid seal in order to clean the liquid seal of impurities liable to create defects in the coating. the band.
  • the sheath comprises a fixed upper part and a movable lower part interconnected by a bellows.
  • the lower part is movable relative to the upper part by means of two jacks.
  • the nature of the movement of the mobile part, rotation and / or translation, as well as its amplitude, are controlled by adjusting the relative strokes of the rods of the two jacks.
  • the patent application KR 10-1533212 describes a coating installation comprising a sheath for running a metal strip, the lower end of which is immersed in the bath of liquid metal to determine with the surface of the bath and inside the sheath, a seal of liquid metal.
  • the sheath comprises, at its lower end, a discharge box delimiting two liquid metal discharge compartments, into which the liquid metal of the bath pours from the liquid seal.
  • the sheath is movable in rotation with respect to the metal strip about an axis of rotation by means of an articulation shaft A1 formed in the vicinity of an upper end of the sheath.
  • the sheath is also connected to a frame of the installation by means of a transfer device 10 comprising an articulation shaft A11.
  • the articulation shafts A1 and A11 are movable in horizontal translation by means of respective transfer devices 10.
  • An object of the invention is to provide a dip coating installation making it possible to position the sheath with respect to the strip and to balance the flow rates in a more flexible and precise manner, while limiting the amplitude of the necessary deflection.
  • the invention relates to a coating installation according to claim 1.
  • the invention also relates to a continuous dip coating process according to claim 22.
  • Aluminum-Zinc coatings comprising for example 55% by weight. aluminum, 43.5% by weight of zinc and 1.5% by weight of silicon, such as Aluzinc ® sold by ArcelorMittal or even zinc-based coatings comprising aluminum, and in particular based on zinc comprising 0.1 to 0.3% aluminum, called GI coatings or coating comprising 5% aluminum, the remainder being zinc and possible impurities.
  • the installation can also be used for the deposition of zinc-based coatings comprising magnesium, called Zinc-Magnesium or Zn-Mg coatings.
  • such coatings further comprise aluminum, and are then called Zinc-Aluminum-Magnesium or Zn-Al-Mg coatings.
  • the galvanizing installation 1 is provided for the deposition of Zn-Al-Mg coatings comprising from 0.1 to 20% by weight of aluminum and from 0.1 to 10% by weight of magnesium.
  • the metal strip 1 is in particular a strip made of steel. However, it could be made in other metallic materials.
  • the metal strip 1 passes through an annealing furnace, not shown, with a view to recrystallizing it after the significant hardening associated with cold rolling, and to prepare its state. surface chemical in order to promote the chemical reactions necessary for the galvanizing operation.
  • the metal strip 1 is brought to a temperature of for example between 650 and 900 ° C.
  • the metal strip 1 passes through a galvanizing installation shown in figure 1 and designated by the general reference 10.
  • This installation 10 comprises a tank 11 containing a bath of liquid metal 12.
  • the composition of the liquid metal bath 12 depends on the composition of the coating that is to be deposited on the strip 1.
  • the bath 12 can also contain up to 0.3% by weight of additional optional elements such as Si, Sb, Pb, Ti, Ca, Mn, Sn, La, Ce, Cr, Ni or Bi. These various additional elements can in particular make it possible to improve the ductility or the adhesion of the metal coating to the strip 1. Those skilled in the art, who are aware of their effects on the characteristics of the metal coating, will know how to use them according to the desired additional goal. .
  • the bath 12 can finally contain residual elements originating from the feed ingots, or resulting from the passage of the strip 1 in the bath 12, source of inevitable impurities in the metallic coating.
  • the temperature of the liquid metal bath 12 is generally between 400 and 700 ° C.
  • the metal strip 1 On leaving the annealing furnace, the metal strip 1 is cooled to a temperature close to that of the liquid metal bath 12 using exchangers and is then immersed in the bath 12.
  • the coating installation 10 comprises a sheath 13 inside which passes the metal strip 1 under an atmosphere protective vis-à-vis the metal in which it is produced.
  • the metal strip 1 passes through the sheath 13 according to a predefined passage plane.
  • This sheath 13 also called “bell descent” or “trunk” has, in the embodiment shown in the figures, a rectangular cross section.
  • the sheath 13 is immersed, at its lower part, in the bath 12 so as to determine with the surface of said bath 12 and inside this sheath 13, a liquid seal 14.
  • the strip 1 at the immersion in the liquid bath 12, passes through the surface of the liquid seal 14 in the sheath 13.
  • the metal strip 1 is deflected by a roll 15 commonly called the bottom roll and placed in the bath 12.
  • the predefined plane of passage of the metal strip 1 through the sheath 13 is in particular determined by the geometry of the bottom roller 15 and of an upper roller (not shown), located upstream of the sheath 13, as well as by the relative positions of these two rollers.
  • the bottom roller 15 and the upper roller thus form means for causing the metal strip to travel along the predetermined passage plane.
  • the coated strip 1 passes through wiping means 16 which are for example constituted by nozzles 16a for spraying gas, such as nitrogen or air and which are directed towards each side of the strip 1 to regulate the thickness of the liquid metal coating.
  • wiping means 16 which are for example constituted by nozzles 16a for spraying gas, such as nitrogen or air and which are directed towards each side of the strip 1 to regulate the thickness of the liquid metal coating.
  • the sheath 13 carries, at its lower end, a discharge box 49 delimiting two compartments 25, 29 for discharging the liquid metal.
  • the compartments 25, 29 are located laterally inside the sheath 13.
  • the discharge box 49 comprises a front compartment 25 for discharging the liquid metal, located opposite the face of the strip 1 located on the side of the bottom roll 15.
  • This front compartment 25 is internally delimited by an inner wall 20. directed towards the surface of the liquid seal 14, and externally by an outer wall 22.
  • the outer wall 22 extends opposite the face of the strip 1 located on the side of the bottom roll 15. It is formed by an outer wall of the discharge box 49.
  • the upper ridge 21 of the inner wall 20 is positioned below the surface of the liquid seal 14 and the compartment 25 is provided with means for maintaining the level of liquid metal in said compartment 25 at a level below the surface. of the liquid seal 14 to achieve a natural flow of liquid metal from this surface of said seal 14 to this compartment 25.
  • the discharge box 49 comprises a rear compartment 29 for discharging the liquid metal, located opposite the face of the strip 1 placed opposite the bottom roll 15.
  • This rear compartment 29 is internally delimited by a wall. interior 26 directed towards the surface of the liquid seal 14 and externally by an exterior wall 28.
  • the exterior wall 26 extends opposite the face of the strip 1 located opposite the bottom roll 15. It is formed by a outer wall of the discharge box 49.
  • the upper ridge 27 of the inner wall 26 is positioned below the surface of the liquid seal 14 and the compartment 29 is provided with means for maintaining the level of liquid metal in said compartment 29 at a level below the surface. of the liquid seal 14 to achieve a natural flow of liquid metal from this surface of said liquid seal 14 to this compartment 29.
  • the outer walls 22, 28 are interconnected by side walls 64 extending opposite the edges of the strip 1.
  • these two compartments 25, 29 communicate with one another to form a single peripheral compartment. It is of course entirely possible to separate them by means of side walls but also to add side compartments facing the edges of the strip 1 to be coated.
  • the height of fall of the liquid metal in the compartments 25 and 29, that is to say the distance in a vertical direction between the upper ridges 21, 27 and the level of liquid metal in compartments 25, 29, is determined to prevent the rise of particles of metal oxide and intermetallic compounds against the flow of liquid metal.
  • This drop height may be greater than or equal to 40 mm, or even greater than or equal to 50 mm and preferably greater than or equal to 100 mm.
  • the means for maintaining the level of liquid metal in the discharge compartments 25 and 29 comprise at least one pump 30 connected on the suction side to said compartment 25 and 29 by a suction pipe, respectively 31 and 33.
  • the pump 30 is provided with on the discharge side of a discharge pipe 32, configured to discharge the liquid metal taken by the pump 30 into the volume of the bath 12.
  • the installation 10 comprises means for detecting the level of liquid metal in the discharge compartments 25, 29.
  • these detection means are formed by a reservoir 35 arranged outside the sheath 13 and the compartments 25, 29, and connected to the base of each of the compartments 25 and 29 by a connecting pipe, respectively 36 and 37
  • a single connection pipe could be used.
  • connection point of the pump 30 on the discharge compartments 25 and 29 is located above the connection point of the reservoir 35 on said compartments 25 and 29.
  • the external reservoir 35 makes it possible to transfer the level of the discharge compartments 25 and 29 to the outside of the sheath 13 in a suitable environment so as to easily detect this level.
  • the reservoir 35 can be equipped with a liquid metal level detector, such as for example a contactor supplying an indicator, a radar or a laser beam.
  • any other means for detecting the level of liquid metal in the discharge compartments 25, 29 can be used.
  • the pump 30 is set at a predetermined constant flow rate and the adjustment of the level of liquid metal is carried out by introducing metal ingots into the tank 11 when the level of liquid metal detected is below a predetermined level. It is also possible to use a variable flow pump which allows, in combination with the means for detecting the level of liquid metal in the discharge compartments 25, 29, a more rapid adjustment of the galvanizing conditions.
  • the sheath 13 comprises an upper part 45 and a lower part 57 immersed at least partially in the bath of liquid metal 12.
  • the upper part 45 comprises two side walls 51, 53 which are substantially parallel to one another, and substantially parallel to the passage plane of the strip 1.
  • the discharge box 49 is carried by the lower part 57 of the sheath 13. More particularly, as shown in the figure. figure 4 , the discharge box 49 is inserted into the lower end of the lower part 57 extending partly inside the sheath 13. It protrudes inferiorly beyond the lower end of the sheath 13.
  • the installation 10 comprises a seal 60 arranged between the lower end of the sheath 13 and the discharge box 49 so as to prevent the penetration of liquid metal from the bath 12 between these two elements.
  • the seal 60 is formed by a bellows secured to the discharge box 49 by one of its ends, and in particular by its lower end, and to the sheath 13 by the other of its ends, in particular by its upper end.
  • a bellows is for example made of steel.
  • Such a bellows allows sealing between the discharge box 49 and the sheath 13 while allowing relative rotation between these two parts.
  • the sheath 13 and the discharge box 49 are movable in rotation jointly about a first axis of rotation A1.
  • the discharge box 49 and the sheath 13 are integral in rotation about the first axis of rotation A1.
  • the first axis of rotation A1 is substantially horizontal.
  • the discharge box 49 is also movable in rotation relative to the upper part 45 of the sheath 13 about a second axis of rotation A2.
  • the second axis of rotation A2 is substantially horizontal.
  • the second axis of rotation A2 is oriented so as to pass through the walls of the sheath 13.
  • the distance d1, d2 between the second axis of rotation A2 and each of the edges 21, 27 of the discharge compartments 25, 29 is less than or equal to 2500 mm. This distance is advantageously between 0 mm and 400 mm.
  • the second axis of rotation A2 is located below the upper edges 21, 27.
  • the first and the second axis of rotation A1, A2 are mutually parallel.
  • the rotation of the discharge box 49 around the second axis of rotation A2 makes it possible to adjust the horizontality of the discharge box 49 independently of the rotational movement possibly carried out around the first axis of rotation A1 by the assembly consisting of the sheath 13 and the discharge box 49.
  • the particular location of the second axis of rotation A2 makes it possible to carry out this adjustment by means of particularly low deflections, and in particular of the order of a few degrees.
  • the discharge box 49 is horizontal when the upper ridges 21, 27 are located in the same horizontal plane defined with a tolerance of plus or minus 5 mm. In other words, a maximum altitude difference of 10 mm is tolerated between the two upper ridges 21 and 27.
  • the sheath 13 is also movable in translation along its longitudinal axis so as to adjust its immersion height in the bath of liquid metal 12, using, for example, a bellows system.
  • a bellows system Such an adjustment mechanism is known and will not be detailed in the context of this patent application.
  • the installation 10 also includes a mechanism for adjusting the horizontality of the upper ridges 21, 27. More particularly, the mechanism for adjusting the horizontality of the upper ridges 21, 27 is configured to adjust the horizontality of the second axis. rotation A2.
  • the discharge box 49 is articulated on the sleeve 13 by means of a pivot connection allowing the rotation of the discharge box 49 relative to the sleeve 13 about the second axis of rotation A2.
  • a pivot connection comprises a pivot, for example in the form of a shaft, shaft section or journal received in a bearing, the pivot extending along the second axis of rotation A2.
  • the pivot is formed on the sheath 13.
  • the discharge box 49 forms a separate part of the sheath 13. It is rotatably mounted on the lower part 57 of the sheath 13. As can be seen in figure 2 , the discharge box 49 is rotatably mounted on the lower part 57 of the sheath 13 by means of journals 67, received in rotation in rotational guide bearings 61.
  • the journals 67 define the axis of rotation A2.
  • the journals 67 are formed on the discharge box 49 and the bearings 61 are formed on the sheath 13. More particularly, the rotational guide bearings 61 are formed in the lower part 57 of the sheath 13, by being arranged on two opposite faces 63 of the sheath 13. They are substantially coaxial with the axis A2. Each guide bearing 61 receives a respective journal 67 formed on the discharge box 49.
  • the journals 67 are formed on the sheath 13, and more particularly in its lower part 57, and the guide bearings 61 are formed on the discharge box 49.
  • the second axis of rotation A2 is immersed in the bath of liquid metal 12. More particularly, the second axis of rotation A2 passes between the two discharge compartments 25, 29, being disposed below the upper ridges 21, 27 of the discharge compartments 25, 29. Such positioning of the second axis of rotation A2 is advantageous, since it results in a radius of rotation of the upper ridges 21, 27 about the second axis of rotation relatively small, which facilitates precise adjustment of the horizontality of the discharge box 49.
  • the installation 10 comprises a first actuator 41, configured to move the sheath 13 in rotation about the first axis of rotation A1 relative to the strip 1.
  • the first actuator 41 is in the form of an actuating cylinder.
  • This actuating cylinder is arranged between a fixed frame 40 of the installation 10 and the sheath 13, more particularly the upper part 45 of the sheath 13.
  • the first actuator 41 acts on the sheath 13 at the level of the lower end of the part 45.
  • the first actuator 41 is formed by a screw jack.
  • the first actuator 41 is of any other suitable type, and for example comprises a hydraulic or pneumatic cylinder.
  • the installation 10 advantageously further comprises a viewing tool 42 of the relative distance between each of the upper ridges 21, 27 of the discharge compartments 25, 29 and the metal strip 1. More particularly, the viewing tool 42 comprises a camera arranged in the sheath 13 so as to allow simultaneous viewing of the upper edges 21, 27 and of the edge of the strip 1. This viewing tool 42 has been shown only schematically on the figure 4 .
  • the installation 10 comprises control means (not shown), configured to control the first actuator 41 from the relative positions of the upper edges 21, 27 and of the strip 1 determined by means of the tool. display 42.
  • the installation 10 further comprises a second actuator 71, configured to move the discharge box 49 in rotation about the second axis of rotation A2 relative to the sheath 13.
  • the second actuator 71 is in the form of an actuating jack, and in particular of a screw jack.
  • the second actuator 71 is of any other suitable type, and for example comprises a hydraulic cylinder.
  • the installation 10 further comprises a measuring sensor 72 configured to measure the angle of inclination of the discharge box 49 relative to the horizontal.
  • This measurement sensor 72 has been shown only schematically on the figure 4 .
  • the installation 10 also comprises control means (not shown) of the second actuator 71, configured to control the second actuator 71 as a function of the angle of inclination measured by the measurement sensor 72. More particularly, these control means are configured to control the rotation of the discharge box 49 relative to the sheath 13 about the second axis of rotation A2 until the discharge box 49 is oriented horizontally, i.e. up to that the upper edges 21, 27 are located in the same horizontal plane.
  • the installation 10 comprises a support frame 75 for the discharge box 49, as well as the pump 30 and the conduits associated with the pump 30.
  • the support frame 75 is integral in rotation with the sheath 13 about the first axis of rotation A1. It is also integral in rotation with the discharge box 49 about the second axis of rotation A2.
  • the pump 30 is fixedly mounted on this support frame 75. As explained above, the pump 30 is connected to the discharge compartments 25, 29 by means of suction pipes 31 and 33. These suction pipes 31, 33 are rigid conduits, mounted fixed on the discharge box 49 and on the pump 30. The discharge pipe 32 is also formed by a rigid conduit mounted fixed on the pump 30. The suction pipes 31, 33 and the delivery pipe 32 are integral in rotation with the discharge box 49 and the pump 30.
  • the installation 10 comprises a reservoir 35 for viewing the level of liquid metal in the discharge compartments 25, 29 as defined above, the latter is advantageously mounted fixed relative to the support frame.
  • the display tank 35 is integral in rotation with the support frame. It will be noted that, for reasons of simplification of figures 3 and 4 , the viewing tank 35 has been omitted in this figure.
  • the support frame 75 is connected to the sheath 13 by means of the actuator 71 for driving the discharge box 49 in rotation.
  • the body 77 of the drive cylinder 71 is mounted to pivot relative to the sheath 13 about an axis of rotation A3 parallel to the axis of rotation A2, and the rod 79 of the cylinder d
  • the drive 71 is connected to the support frame 75 while being rotatably movable with respect to the support frame 75 about an axis of rotation A4 parallel to the axis of rotation A2.
  • the variation in the length of the jack 71 causes the support frame 75 and the discharge box 49 to pivot around the axis of rotation A2.
  • the outer wall 28 of the rear discharge compartment 29 forms, in a configuration of use of the coating installation 10, an angle ⁇ strictly greater than 0 ° with the passage plane of the strip 1, and for example greater than or equal to 15 °, and advantageously greater than or equal to 25 °, or even greater than or equal to 30 °. Indeed, it has been observed that the more the angle increases, the more the efficiency also increases.
  • configuration of use is meant the configuration of the coating installation 10 when the metal strip 1 passes through the installation 10 in order to be coated while passing through the bath of liquid metal 12.
  • the two upper edges 21, 27 of the two discharge compartments 25, 29 are located in the same horizontal plane.
  • the inventors of the present invention have found that such a configuration of the outer wall 28 is particularly advantageous.
  • it makes it possible to obtain, on the side of the face of the metal strip 1 facing the discharge compartment 29, a coating having a very low density of defects, while limiting the size of the coating installation 10. .
  • the orientation of the outer wall 28 as described above makes it possible to reduce such projections, and therefore results in a better quality of appearance of the concerned face of the strip 1.
  • the outer wall 28 extends further tangentially to the general direction of flow of the liquid metal cascade.
  • the outer wall 28 of the rear discharge compartment 29 is oriented so as to move away from the passage plane of the strip 1 from its upper end towards the bottom of the rear discharge compartment 29.
  • the angle ⁇ between the outer wall 28 and the passage plane of the strip 1 is strictly greater than 0 ° and may be less than, greater than or equal to ⁇ 0 , where ⁇ 0 is the angle between the passage plane of the band 1 and the vertical, knowing that the risk of splashing is all the lower as the angle ⁇ is high.
  • the outer wall 28 forms with the passage plane of the strip 1 an angle ⁇ between ⁇ 0 - 10 ° and ⁇ 0 + 50 °, and more particularly between ⁇ 0 and ⁇ 0 + 45 ° .
  • the risk of splashing is minimal when the outer wall 28 forms with the strip 1 an angle ⁇ strictly greater than the angle ⁇ 0 of the passage plane of the strip 1 with the vertical.
  • the strip 1 forms with the vertical an angle ⁇ 0 of between 25 ° and 50 °.
  • the strip 1 forms with the vertical an angle ⁇ 0 approximately equal to 30 °.
  • the inner wall 26 of the discharge compartment 29 is inclined, from its upper edge 27 towards the bottom of the compartment 29, away from a median vertical plane P between the two edges 21, 27.
  • the inner wall 26 of the discharge compartment 29 is inclined so as to deviate from a vertical plane passing through the upper ridge 27 from its upper ridge 27 at direction of the bottom of the compartment 29. It forms with the vertical an angle ⁇ 1 strictly greater than zero, as is shown more particularly on the figure 4 .
  • An inclination at an angle ⁇ 1 greater than or equal to 15 ° is particularly advantageous for reducing the risks of projections.
  • the angle ⁇ 1 is greater than or equal to 20 °, and more particularly greater than or equal to 25 °.
  • the outer wall 22 of the front discharge compartment 25 is oriented substantially parallel to the passage plane of the strip 1. In the case of the discharge compartment 25, which is located on the side of the face of the strip 1 placed opposite the roller of bottom 15, this orientation makes it possible to avoid projections on the strip 1, the outer wall 22 extending substantially tangentially to the general direction of flow of the cascade of liquid metal flowing into the compartment 25.
  • the inner wall 20 of the discharge compartment 25 is inclined, from its upper edge 21 and in the direction of the bottom of the compartment 25, away from the median vertical plane P defined above as is shown more particularly in Figure figure 4 .
  • the inner wall 26 of the discharge compartment 25 is inclined so as to deviate from a vertical plane passing through the upper edge 21 from its upper edge 21 towards the bottom of the compartment 25. It forms with the vertical an angle ⁇ 2 strictly greater than zero,
  • Such an inclination makes it possible to guide the flow of the liquid metal in the discharge compartment 25 generally along the interior wall 20 and thus to reduce the risks of projections on the strip 1.
  • An inclination at an angle ⁇ 2 greater than or equal to 15 ° is particularly advantageous for reducing the risk of projections.
  • the angle ⁇ 2 is strictly greater than the angle ⁇ 0 formed between the passage plane of the strip 1 and the vertical in order to prevent the strip 1 from rubbing the wall interior 20 when it passes through the installation 10.
  • the angle ⁇ 2 is at least 3 ° greater than the angle ⁇ 0 .
  • the angle ⁇ 2 is advantageously approximately equal to 35 °. Such an angle also makes it possible to ensure good guiding of the liquid metal along the inner wall 20.
  • angles ⁇ 1 and ⁇ 2 are identical. They are for example approximately equal to 35 °.
  • the inner 20, 26 and outer 28 walls of the discharge compartments 25, 29 are generally substantially planar.
  • the values of inclination mentioned above are defined with respect to the mean plane of the walls concerned.
  • angles ⁇ , ⁇ 1 and ⁇ 2 are defined in the configuration of use of the coating installation.
  • the inner walls 20 and 26 are preferably tapered at their upper edges 21, 27 to facilitate flow along the wall 20, 26 and avoid splashing the strip 1.
  • the upper ridges 21 and 27 of the inner walls 20 and 26 of the discharge compartments 25 and 29 comprise, in the longitudinal direction, a succession of hollows and projections in the form of an arc of a circle.
  • the side wall 58 of the lower part 57 of the duct 13 is, by way of example, parallel to the outer wall 28 of the rear discharge compartment 29 in its part located opposite said outer wall 28.
  • this side wall 58 forms an angle with the side wall 51 of the upper part 45, which extends substantially parallel to the passage plane of the metal strip 1.
  • the outer wall 22 of the discharge compartment 25 and the side wall 59 of the lower part 57 of the sheath 13 located opposite this outer wall 22 are parallel.
  • Such a configuration also contributes to limiting the bulk of the sheath 13. More particularly, in the example shown in the figures. figures 1 to 4 , the outer wall 22 of the front discharge compartment 25 extends substantially parallel to the passage plane of the strip 1.
  • the side wall 59 of the lower part 57 extends in the extension of the side wall 53 of the upper part 45 and extends substantially parallel to the passage plane of the strip 1.
  • the outer walls 22, 28 of the discharge compartments 25, 29 extend laterally inwardly with respect to the side walls 58, 59 of the lower part 57.
  • the installation 10 according to the invention makes it possible to obtain coated metal strips 1 having a considerably reduced defect density on each of their faces, and the quality of appearance thus obtained of this coating meets the criteria required by customers wishing to parts whose surfaces are free from defects in appearance.
  • the liquid seal surface 14 is cleaned permanently and on each side of the strip 1 of zinc oxides and mattes liable to float thereon and which could create appearance defects in the coating.
  • the pivoting character as a whole of the sheath 13 and of the discharge box 49 around the first axis of rotation A1 and the pivoting mounting of the discharge box 49 on the sleeve 13 around the second axis of rotation A2 make it possible to minimize the appearance defects of the coating on both sides of the strip 1 regardless of the position or the characteristics of the bottom roll 15, and in particular in the event of a change in the characteristics or the position of this roll 15.
  • the line of passage of the strip 1 through the sheath 13 is determined by the position of the bottom roll 15 in the bath of liquid metal 12, as well as by the diameter of the bottom roll 15.
  • bottom roller 15 is capable of modifying the line of passage of the strip 1 in the sheath 13, and therefore of off-center the discharge compartments 25, 29 with respect to the strip 1.
  • the wear of the roller. bottom 15 during the operation of the installation 1, which results in a reduction in its diameter also results in a modification of the line of passage of the strip 1 in the sheath 13, and therefore by an off-centering of the discharge compartments 25, 29 compared to band 1.
  • the line of passage of the strip 1 is substantially centered between the two discharge compartments 25, 29. In fact, otherwise, the strip 1 risks touching the inner walls 20, 26 of these compartments 25. , 29 when it passes through the sheath 13.
  • the installation 10 as described above makes it possible to overcome this drawback thanks to the possibility of a pivoting of the discharge box 49 relative to the sheath 13 about the second axis of rotation A2, such a pivot making it possible to restore the 'horizontality of the discharge box 49 and thus resulting in a rebalancing of the discharge rates in each of the compartments 25, 29.
  • the fact of providing that the sheath 13 and the discharge box 49 are made in two separate parts, the sleeve 13 and the discharge box being integral in rotation around the first axis of rotation A1 in order to achieve the centering of the strip 1, and the discharge box 49 being mounted to rotate about the axis of rotation A2 relative to the sheath 13 by means of a bearing precisely defining the position of the axis of rotation A2 relative to the sheath 13 makes it possible to achieve very precisely and independently, on the one hand the centering of the discharge box 49 relative to the metal strip 1 and, on the other hand, the balancing of the flow rates between the two discharge compartments 25, 29.
  • the mechanism described with regard to the first embodiment is much simpler and enables the positioning of the sheath 13 relative to the strip 1 and the balancing of the flow rates in a much more precise and flexible manner than the structures described. in previous patent applications WO 02/38823 and KR 10-1533212 .
  • the small angular movement in rotation around the first axis of rotation A1 is advantageous insofar as the coating installation 10 is generally located in a crowded environment, not allowing large angular movements of the sheath 13 as a whole.
  • the low angular movement necessary for the rotation of the discharge box 49 allows rebalancing, while maintaining a good seal between the discharge box 49 and the sheath 13, by simply providing between the discharge box 49 and the sheath 13 a seal 60 sufficiently deformable to allow the angular movement of the discharge box 49.
  • This method comprises the adjustment of the coating installation 10, in particular after a change of the ground roll 15.
  • the sheath 13 is moved in rotation around the first axis of rotation A1 so as to center the metal strip 1 with respect to the upper edges 21, 27 of the discharge compartments 25, 29.
  • the relative position of the upper edges 21 and 27 with respect to the metal strip 1 is detected by means of the viewing tool 42 and the movement of the sheath 13 is controlled as a function of the position thus determined.
  • the rotational movement of the sheath 13 is controlled by an operator acting on the first actuator 41 as a function of the respective position of the upper edges 21 and 27 and of the metal strip 1. determined by means of the visualization tool 42.
  • the operator can be a natural person or an automatic device.
  • the positioning of the discharge box 49 relative to the strip 1 is carried out automatically by control means configured to control the first actuator 41 from the relative positions determined by means of the viewing tool 42.
  • the discharge box 49 is rotated with respect to the upper part 45 of the sheath 13 around the second axis of rotation A2 so as to make the box horizontal discharge 49.
  • the discharge box 49 is driven in rotation about the second axis of rotation A2 relative to the lower part 57 of the sheath 13.
  • control means control the rotation of the discharge box 49 as a function of the measurements taken by the inclination sensor 72.
  • this rotation is controlled by an operator acting on the second actuator 71 as a function of the inclination measured by the inclination sensor 72 or observed by the operator.
  • the strip 1 is substantially centered with respect to the upper edges 21, 27 and these edges 21, 27 are arranged in the same horizontal plane.
  • the centering step is repeated, and possibly the rebalancing step as often as necessary, to obtain satisfactory positioning of the upper edges 21, 27 relative to band 1.
  • the horizontality of the upper edges 21, 27 is adjusted by means of the mechanism for adjusting the horizontality of these edges 21, 27. More particularly, during this step, action is taken on the axis of rotation A2 so as to adjust its horizontality.
  • the surface of the bath 12 of liquid metal is chosen as the horizontal reference for the implementation of this adjustment.
  • the adjustment of the horizontality of the upper ridges 21, 27 is implemented in particular after a replacement of the discharge box 49.
  • the sheath 13 is moved in translation along its axis so as to adjust its height of immersion in the bath 12 of liquid metal. Such an adjustment is known and will not be detailed in the context of this patent application.
  • the installation 100 according to the second embodiment differs from the installation 10 in particular by the location of the second axis of rotation A2.
  • the discharge box 49 is carried by the lower part 57 of the sheath 13 while being mounted to rotate thereon about the second axis of rotation A2.
  • the discharge box 49 is carried by the lower part 57 of the sheath 13 while being fixed relative to the latter.
  • the lower part 57 of the sheath 13 is, for its part, rotatably mounted on the upper part 45 of the sheath 13 about a second axis of rotation A2.
  • the discharge box 49 is movable in rotation about the axis of rotation A2 relative to the upper part 45 of the sheath 13.
  • the outer walls of the discharge box 49 which form the outer walls 22, 28 of the discharge compartments 25, 29 are formed by the side walls 58, 59 of the lower part 57 of the sheath 13
  • the discharge box 49 is, in this embodiment, integrated into the lower part 57 of the sheath 13.
  • the lower part 57 of the sheath 13 is articulated on the upper part 45 of the sheath 13 by means of a pivot connection allowing the rotation of the discharge box 49 relative to the upper part 45 of the sheath 13 around the second axis of rotation A2.
  • the axis of rotation A2 passes through the walls of the sheath 13.
  • the second axis of rotation A2 is located outside the bath of liquid metal 12.
  • the second axis of rotation A2 is located above the discharge compartments 25, 29.
  • the distance d1, d2 between the second axis of rotation A2 and each of the edges 21, 27 of the discharge compartments 25, 29 is less than or equal to 2500 mm. This distance is advantageously between 800 mm and 1400 mm.
  • the installation 100 comprises two shaft sections 110 defining the axis of rotation A2.
  • the articulation allowing rotation around the second axis of rotation A2 is formed outside the passage duct for the strip 1 delimited by the sheath 13. In particular, it is formed on the sheath 13.
  • the upper part 45 of the sheath 13 is provided with two upper articulation arms 108.
  • Each of these upper articulation arms 108 receives, at its lower end, a shaft section 110, said section of shaft 110 rotatingly receiving a lower articulation arm 109 integral with the lower part 57 of the sheath.
  • the articulation arms 108, 109 are more particularly in the form of articulation yokes linked to rotation by means of the shaft section 110.
  • any other articulation mechanism creating a pivot connection between the discharge box 49 and the upper part 45 of the sheath 13 around an axis of rotation A2 can be envisaged.
  • the second actuator 71 is in the form of an actuating cylinder, arranged between the lower part 57 and the upper part 45 of the sheath 13, so as to drive the discharge box 49 in rotation about the second axis of rotation. A2 with respect to the upper part 45 of the sheath 13.
  • the second actuator 71 is in particular a screw jack.
  • the second actuator 71 is of any other suitable type, and for example comprises a hydraulic or pneumatic cylinder.
  • the installation 100 further comprises a measuring sensor configured to measure the angle of inclination of the discharge box 49 with respect to the horizontal and means for controlling the second actuator 71 , configured to control the second actuator 71 as a function of the tilt angle measured by the measurement sensor 72.
  • the installation 100 further comprises sealing means 106, arranged between the lower end of the upper part 45 of the sheath 13 and the upper end of the lower part 57.
  • the means sealing 106 are configured to prevent the entry of air into the duct 13 from the environment. They comprise for example a bellows extending between the lower end of the upper part 45 and the upper end of the lower part 57 of the sheath 13.
  • This bellows also acts as a compensator allowing the relative movement of the lower part 57 with respect to the upper part 45 of the sheath 13.
  • the installation 100 further comprises a mechanism 120 for adjusting the horizontality of the upper ridges 21, 27 of the interior walls 20, 26 of the compartments 25, 29.
  • the mechanism 120 comprises, on the side of each of the ends of the upper ridges 21, 27, at least one adjustment screw 122 configured to adjust the height of said end. More particularly, each adjustment screw 122 is configured to act on a corresponding part of the lower part 57 of the sheath 13.
  • the adjustment screws 122 are provided at the level of the lower articulation arm 109 of the articulation mechanism of the lower part 57 on the upper part 45 of the sheath 13. They are arranged so that their screwing or unscrewing results in a vertical displacement of the corresponding part of the lower part 57 relative to the lower articulation arm 109, and thus, indirectly, in an adjustment of the height of the corresponding ends of the upper ridges 21, 27.
  • the arm lower articulation 109 is secured to the lower part 57 by means of securing screws 111 passing through oblong holes in the lower articulation arm 109, thus allowing the lower part 57 to be adjusted in position relative to the arm lower joint 109.
  • the lower part 57 comprises an upper section and a lower section, fixed to the upper section.
  • the upper section is not intended to be immersed in the bath of liquid metal 12.
  • the lower section is intended to be at least partially immersed in the bath of liquid metal 12.
  • the lower section is in particular attached to the upper section by welding. .
  • the outer walls 22, 28 of the discharge compartments 25, 29 are formed by the side walls of the lower section of said lower part 57.
  • the pump 30 is partially immersed in the bath of liquid metal 12. It is integral in rotation with the discharge box 49 by means of a frame 75 fixed to the lower part 57 of the sheath 13.
  • the suction pipes 31, 32 are rigidly fixed between the pump 30 and the casing of discharge 49.
  • the pump 30 and the suction pipes 31, 32 are movable in rotation with the discharge box 49 about the first axis of rotation A1 relative to the frame 40 of the installation 100 and about the second axis of rotation A2 relative to the upper part 45 of the sheath 13.
  • the installation 100 according to the second embodiment exhibits most of the advantages provided by the installation 10 according to the first embodiment.
  • the location of the second axis of rotation A2 outside the bath of liquid metal 12 is advantageous, because it avoids having to achieve the seal between the discharge box 49 and the main downspout. 45 in the liquid metal bath.
  • the distance between the second axis of rotation A2 and the ridges 21, 27 of the discharge compartments 25, 29 is greater than this distance in the first embodiment, which risks increasing the overall size of the equipment 100.
  • the method for adjusting the installation 100 according to the second embodiment is analogous to the method for adjusting the installation 10 according to the first embodiment. It will be noted, however, that during the step of rebalancing the flow rates, more particularly, the lower part 57 of the sheath 13 provided with its discharge box 49 is rotated about the second axis of rotation A2 with respect to the part. upper 45 of the sheath 13.
  • the method of adjusting the installation 100 further comprises a step of adjusting the horizontality of the upper edges 21, 27 by means of the adjustment mechanism 120.
  • this step comprises screwing or unscrewing.
  • adjustment screws 122 as a function of a possible lack of horizontality of the edges 21, 27 observed so as to re-establish the horizontality of the edges 21, 27.
  • This adjustment is implemented in particular by taking the surface of the bath 12 of liquid metal as a horizontal reference.
  • the adjustment of the horizontality of the upper ridges 21, 27 is implemented in particular after replacement of the lower part 57 of the sheath 13 provided with its discharge box 49.
  • each of the upper edges 21, 27 extends horizontally.
  • the characteristics linked to the first aspect make it possible to achieve in a simple, flexible and precise manner, the centering of the strip 1 in the sheath 13 and the balancing of the flow rates of discharge into the two compartments, thus resulting in an excellent quality of appearance of the coating on each of its faces.
  • the characteristics linked to the second aspect, and in particular the orientation of the outer wall 28 of the compartment 29, make it possible to reduce the risks of liquid metal splashing onto the strip 1, thus also contributing to improving the quality of appearance of the coating on both sides of the strip, and in particular on the face of the strip facing away from the background roll 15.
  • the first aspect which corresponds to the claimed invention can be implemented independently of the second aspect, the first aspect, taken alone, already contributing to a significant improvement in the quality of the coating.
  • the two aspects of the present invention lead to an even better quality of appearance of the coating of the strip on each of its faces than when only one of these aspects is implemented.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Computer Hardware Design (AREA)
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  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Continuous Casting (AREA)

Claims (29)

  1. Anlage (10; 100) zur kontinuierlichen Tauchbeschichtung eines Metallbands (1), umfassend:
    - einen Tank (11) zum Aufnehmen eines Flüssigmetallbads (12),
    - eine Bodenwalze (15), die in der Wanne (11) angeordnet und dazu bestimmt ist, in das Flüssigmetallbad (12) eingetaucht zu werden,
    - ein Hüllrohr (13) zum Ziehen des Metallbands (1), dessen unteres Ende dazu bestimmt ist, in das Flüssigmetallbad (12) eingetaucht zu werden, um mit der Oberfläche des Bads (12) und im Inneren dieses Hüllrohrs (13) eine Flüssigmetallverbindung (14) zu bestimmen,
    das Hüllrohr (13) umfassend einen oberen Abschnitt (45) und einen unteren Abschnitt (57), wobei der untere Abschnitt (57) einen Überlaufkasten (49) trägt, der mindestens zwei Flüssigmetall-Überlauffächer (25, 29) definiert, wobei jedes Überlauffach (25, 29) im Inneren durch eine Innenwand (20, 26) definiert ist, die Innenwand (20, 26) umfassend einen oberen Rand (21, 27) umfasst, wobei der obere Rand (21, 27) jeder Innenwand (20, 26) dazu bestimmt ist, unter der Flüssigkeitsverbindungsfläche (14) angeordnet zu sein, um eine Strömung von der Fläche (14) in jedes der Überlauffächer (25, 29) zu ermöglichen,
    wobei die Anlage dadurch gekennzeichnet ist, dass
    das mit dem Überlaufkasten (49) versehene Hüllrohr (13) in Bezug auf das Metallband (1) um eine erste Drehachse (A1) drehbar ist; und dass
    der Überlaufkasten (49) in Bezug auf den oberen Abschnitt (45) des Hüllrohrs (13) um eine zweite Drehachse (A2) drehbar ist, wobei die zweite Drehachse (A2) im Wesentlichen parallel zu der ersten Drehachse (A1) ist, wobei das Gelenk, das die Drehung des Überlaufkastens (49) in Bezug auf den oberen Abschnitt (45) des Hüllrohrs (13) ermöglicht, eine Schwenkverbindung ist
  2. Anlage (10; 100) nach Anspruch 1, wobei der Abstand (d1, d2) zwischen der zweiten Drehachse (A2) und jeder der oberen Ränder (21, 27) der Innenwände (20, 26) kleiner als oder gleich wie 2500 mm ist.
  3. Anlage (10; 100) nach einem der Ansprüche 1 oder 2, die mindestens eine Pumpe (30) umfasst, die konfiguriert ist, um das flüssige Metall aus den Überlauffächern (25, 29) zu extrahieren, mindestens eine Saugleitung (31, 33), die jedes Überlauffach (25, 29) mit der Pumpe (30) verbindet und ein Förderrohr (32), das dazu bestimmt ist, das aus den Überlauffächern (25, 29) stammende Flüssigmetall in das Flüssigmetallbad (12) zu fördern, wobei die Pumpe (30) und die Ansaug- (31, 33) und Förderleitungen (32) in Bezug auf den Überlaufkasten (49) feststehend montiert sind.
  4. Anlage (10; 100) nach einem der vorherigen Ansprüche, die ein erstes Stellglied (41) umfasst, das konfiguriert ist, um das Hüllrohr (13) um die erste Drehachse (A1) in Bezug auf das Band (1) zu drehen, und ein zweites Stellglied (79), das konfiguriert ist, um den Überlaufkasten (49) in Bezug auf den oberen Abschnitt (45) des Hüllrohrs (13) um die zweite Drehachse (A2) zu drehen.
  5. Anlage (10; 100) nach Anspruch 4, ferner umfassend einen Neigungssensor (72), der konfiguriert ist, um den Neigungswinkel des Überlaufkastens (49) in Bezug auf die Horizontale zu messen.
  6. Anlage (10; 100) nach Anspruch 5, ferner umfassend Steuereinrichtungen des zweiten Stellglieds (79) abhängig von dem durch den Neigungssensor (72) gemessenen Neigungswinkel.
  7. Anlage (10; 100) nach einem der vorherigen Ansprüche, ferner umfassend ein Visualisierungs-Tool (42) der Position der Innenwände (20, 26) der Überlauffächer (25, 29) in Bezug auf das Band (1).
  8. Anlage (10; 100) nach einem der vorherigen Ansprüche, ferner umfassend Visualisierungseinrichtungen auf Ebene des Flüssigmetallpegels in den Überlauffächern (25, 29), die Visualisierungseinrichtungen umfassend ein Reservoir (35), das außerhalb des Hüllrohrs (13) angeordnet und mit dem Boden von jedem der Überlauffächer (25, 29) durch mindestens eine Verbindungsleitung (36, 37) verbunden ist, wobei das Reservoir (35) in Bezug auf den Überlaufkasten (49) feststehend montiert ist.
  9. Anlage (100) nach einem der vorherigen Ansprüche, ferner umfassend Einstelleinrichtungen der Horizontalität der oberen Ränder (21, 27) der Innenwände (20, 26) der Überlaufkästen (25, 29).
  10. Anlage (100) nach einem der vorherigen Ansprüche, wobei der Überlaufkasten (49) in Bezug auf den unteren Abschnitt (57) des Hüllrohrs (13) feststehend ist und der untere Abschnitt (57) des Hüllrohrs (13) um die zweite Drehachse (A2) drehbar auf dem oberen Abschnitt (45) des Hüllrohrs (13) montiert ist.
  11. Anlage (100) nach Anspruch 10, wobei die Außenwände des Überlaufkastens (49) durch Seitenwände (58, 59) des unteren Abschnitts (57) des Hüllrohrs (13) gebildet sind.
  12. Anlage (100) nach einem der Ansprüche 10 oder 11, wobei die zweite Drehachse (A2) konfiguriert ist, um sich außerhalb des Flüssigmetallbads (12) zu befinden.
  13. Anlage (100) nach einem der Ansprüche 10 bis 12, dadurch gekennzeichnet, dass die Schwenkverbindung, die die Drehung des Überlaufkastens (49) in Bezug auf den oberen Abschnitt (45) des Hüllrohrs ermöglicht, einen oberen Gelenkarm (108), der fest mit dem oberen Abschnitts (45) des Hüllrohrs (13) verbunden ist, und einen unteren Gelenkarm (109), der fest mit dem unteren Abschnitt (57) des Hüllrohrs (13) verbunden ist, umfasst, wobei der obere und der untere Gelenkarm (108, 109) über einen Wellenabschnitt (110) drehbar verbunden sind.
  14. Anlage (10) nach einem der Ansprüche 1 bis 9, wobei der Überlaufkasten (49) drehbar auf dem unteren Abschnitt (57) des Hüllrohrs (13) montiert ist.
  15. Anlage (10) nach Anspruch 14, dadurch gekennzeichnet, dass der Überlaufkasten (49) in das Hüllrohr (13) an dem unteren Ende davon eingesetzt ist.
  16. Anlage (10) nach Anspruch 14 oder 15, wobei entweder der untere Abschnitt des Hüllrohrs (13) oder des Überlaufkastens (49) Wellenlager (61) und der andere von dem unteren Abschnitt des Hüllrohrs (13) oder des Überlaufkastens (49) Drehzapfen (67) aufweist, wobei jeder Drehzapfen (67) in einem entsprechenden Führungslager (61) aufgenommen ist, um die Überlaufkasten (49) drehbar um die zweite Drehachse (A2) zu führen.
  17. Anlage (10) nach einem der Ansprüche 14 bis 16, wobei die zweite Drehachse (A2) zum Eintauchen in das Flüssigmetallbad (12) bestimmt ist.
  18. Anlage (10) nach Anspruch 17, das eine Dichtung (60) umfasst, die zwischen dem Überlaufkasten (49) und dem unteren Abschnitt (57) des Hüllrohrs (13) angeordnet ist, um das Eindringen von Flüssigmetall zwischen dem Überlaufkasten (49) und dem Hüllrohr (13) zu verhindern.
  19. Anlage (10) nach einem der Ansprüche 14 bis 18, wobei die zweite Drehachse (A2) unterhalb der oberen Ränder (21, 27) der Überlauffächer (25, 29) angeordnet ist, wenn der Überlaufkasten (49) horizontal ist.
  20. Anlage (10; 100) nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass das hintere Überlauffach (29), das sich auf der Seite der Fläche des Metallbands (1) befindet, das gegenüber der Bodenwalze (15) platziert ist, außen durch eine Außenwand (28) begrenzt ist, wobei die Außenwand (28) konfiguriert ist, um in der Gebrauchskonfiguration der Beschichtungsanlage (10; 100) mit der Durchlaufebene des Bands (1) einen Winkel (α) zu bilden, der strikt größer als Null und vorzugsweise größer als oder gleich wie 15° ist.
  21. Anlage (10, 100) nach Anspruch 20, wobei die Außenwand (28) des hinteren Überlauffachs (29) konfiguriert ist, um in der Gebrauchskonfiguration der Beschichtungsanlage (10; 100) vertikal zu sein.
  22. Verfahren zur kontinuierlichen Tauchbeschichtung eines Metallbands (1) mittels einer Beschichtungsanlage (10; 100) nach einem der vorherigen Ansprüche, umfassend:
    - einen Schritt eines Positionierens des Überlaufkastens (49) in Bezug auf das Metallband (1), der die Drehverschiebung des Hüllrohrs (13) und des Überlaufkastens (49) um die erste Drehachse (A1) umfasst, um das Metallband (1) in Bezug auf die oberen Ränder (21, 27) der Überlauffächer (25, 29) zu positionieren; dann
    - einen Schritt eines Wiederherstellens eines Gleichgewichts, der die Rotationsverschiebung des Überlaufkastens (49) um die zweite Rotationsachse (A2) in Bezug auf den oberen Abschnitt (45) des Hüllrohrs (13) umfasst, um den Überlaufkasten (49) horizontal zu machen.
  23. Beschichtungsverfahren nach Anspruch 22, ferner umfassend einen Schritt zur Einstellung der Horizontalität der oberen Ränder (21, 27) der Innenwände (20, 26) der Überlauffächer (25, 29).
  24. Beschichtungsverfahren nach Anspruch 22 oder 23, bei dem auf das Metallband (1) eine Beschichtung aus Zink und Aluminium, insbesondere eine Aluminium-ZinkBeschichtung, aufgebracht wird, beispielsweise aus 55 Gewichtsprozent Aluminium, 43,5 Gewichtsprozent Zink und 1,5 Gewichtsprozent Silizium.
  25. Verfahren nach Anspruch 22 oder 23, bei dem eine Aluminium enthaltende Beschichtung auf Zinkbasis auf das Metallband (1) aufgebracht wird.
  26. Verfahren nach Anspruch 25, bei dem auf das Metallband (1) eine Beschichtung aufgebracht wird, umfassend zwischen 0,1 und 0,3 % Aluminium.
  27. Verfahren nach Anspruch 26, bei dem eine Beschichtung umfassend 5 % Aluminium auf das Metallband (1) aufgebracht wird, wobei der Rest Zink ist.
  28. Verfahren nach Anspruch 22 oder 23, bei dem auf das Metallband (1) eine Beschichtung auf Zinkbasis und umfassend Magnesium und eventuell Aluminium aufgebracht wird, und umfassend vorzugsweise 0,1 bis 20 Gewichtsprozent Aluminium und 0,1 bis 10 Gewichtsprozent Magnesium.
  29. Verfahren nach Anspruch 22 oder 23, bei dem auf das Metallband (1) eine Beschichtung auf Aluminiumbasis und umfassend Silizium und Eisen, insbesondere eine Beschichtung mit der folgenden Zusammensetzung, aufgebracht wird:
    8 %≤ Si <11 %
    2 % ≤ Fe ≤ 4 %,
    wobei der Rest Aluminium und mögliche Verunreinigungen sind.
EP17719928.8A 2016-04-26 2017-04-26 Vorrichtung zur kontinuierlichen heisstauchbeschichtung eines metallbandes und zugehöriges verfahren Active EP3449029B1 (de)

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US20190144982A1 (en) 2019-05-16
AU2017257425B2 (en) 2022-08-18
KR20190002463A (ko) 2019-01-08
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MX2018012957A (es) 2019-03-28
UA124233C2 (uk) 2021-08-11
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PL3449029T3 (pl) 2022-05-02
CA3022132C (fr) 2024-04-23
KR102357815B1 (ko) 2022-01-28
EP3449029A1 (de) 2019-03-06
BR112018071575A2 (pt) 2019-02-12
CN109072391A (zh) 2018-12-21
JP6963561B2 (ja) 2021-11-10
BR112018071575B1 (pt) 2022-09-13
RU2018137572A3 (de) 2020-07-16
WO2017187226A1 (fr) 2017-11-02
AU2017257425A1 (en) 2018-11-01
US11149336B2 (en) 2021-10-19
CN117758183A (zh) 2024-03-26
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