EP3408424A1 - Vorrichtung zur hydrodynamischen stabilisierung eines kontinuierlich laufenden metallbandes - Google Patents

Vorrichtung zur hydrodynamischen stabilisierung eines kontinuierlich laufenden metallbandes

Info

Publication number
EP3408424A1
EP3408424A1 EP17700271.4A EP17700271A EP3408424A1 EP 3408424 A1 EP3408424 A1 EP 3408424A1 EP 17700271 A EP17700271 A EP 17700271A EP 3408424 A1 EP3408424 A1 EP 3408424A1
Authority
EP
European Patent Office
Prior art keywords
strip
pads
installation according
coating
liquid metal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP17700271.4A
Other languages
English (en)
French (fr)
Other versions
EP3408424B1 (de
Inventor
Maïwenn LARNICOL
Yves Hardy
Olivier BREGAND
Pascal GERKENS
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Centre de Recherches Metallurgiques CRM ASBL
Original Assignee
Centre de Recherches Metallurgiques CRM ASBL
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 Centre de Recherches Metallurgiques CRM ASBL filed Critical Centre de Recherches Metallurgiques CRM ASBL
Priority to PL17700271T priority Critical patent/PL3408424T3/pl
Publication of EP3408424A1 publication Critical patent/EP3408424A1/de
Application granted granted Critical
Publication of EP3408424B1 publication Critical patent/EP3408424B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • 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
    • C23C2/22—Removing excess of molten coatings; Controlling or regulating the coating thickness by rubbing, e.g. using knives, e.g. rubbing solids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/06—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length by rubbing contact, e.g. by brushes, by pads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/06—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with a blast of gas or vapour
    • 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
    • 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
    • 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
    • C23C2/04—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
    • C23C2/14—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
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/50—Controlling or regulating the coating processes
    • C23C2/51—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/04—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades

Definitions

  • the present invention relates to a dissipative hydrodynamic device for stabilizing a continuous scrolling metal strip passing in wipers after a dip coating operation.
  • the invention relates more particularly to the field of hot dip galvanizing of a steel strip in continuous motion.
  • the hydrodynamic stabilization of the strip is performed at the outlet of the bath of liquid metal, in the vicinity of the wiper device.
  • the so-called "dip coating” technique constitutes a method that is both simple and effective for depositing a coating on the surface of an object.
  • the object to be coated is immersed in a bath comprising the product that is to be deposited on said object.
  • the object is then removed from the bath with removal of the excess liquid and the coating is made solid, for example by drying, solidification, polymerization, etc.
  • the coated part After passing through the bath of liquid metal, the coated part undergoes the spinning operation.
  • This operation is one of the most important in the dip coating process because it allows the control of the final thickness of the coating.
  • the spin must be homogeneous over the entire surface of the product, that is to say the width for a band and the circumference for a wire, and the entire length of the product to be coated.
  • this operation must strictly limit the deposit to the target value, which is usually expressed either in terms of thickness deposited - typically from 3 to 50 ⁇ - or by weight of the deposited layer per unit of surface - typically in gr / m 2 .
  • the spin is generally achieved by means of blades or gas jets, linear in the case of strips and circular in the case of son, from slits and directed most often perpendicular to the surface to be treated.
  • the gas blades act as "pneumatic scrapers” and have the advantage of operating without mechanical contact and therefore without the risk of scratching the treated object.
  • Such blades are called “gas wipers” or “spin knives”.
  • the pressurized gas used is either air or a neutral gas such as nitrogen in the most delicate applications such as the treatment of steel strips intended for the manufacture of visible parts for the automobile bodywork. .
  • the final thickness of the coating depends in particular on the speed of travel of the strip, the distance between the strip and the spinning knives and, finally, the action exerted by the jet of compressed gas on the strip. .
  • It can be a heterogeneity of quality of the base steel, degraded rolling conditions or inhomogeneous heating, temperature maintenance and cooling conditions during the annealing cycle of the strip, before its entry. in the bath of liquid metal.
  • JP 56 153136 A proposes to have at least one pair of stabilizers or pneumatic dampers at positions such that the vibrating length is reduced between the bottom roller and the upper roller, which are fixed points for the bandaged.
  • JP 56 084452 A proposes to use a pneumatic stabilizer in which a portion of the injected fluid flows along the strip in the opposite direction from that from the wipers.
  • JP 2005298908 A proposes to avoid splashing by combining a pneumatic cushion with a scraper, where the gas mixes with the liquid to pass under the scraper.
  • the electromagnetic methods are based on the following principle. Conductors in which a high frequency current flows are installed on both sides of the steel strip. They induce in the band currents in phase opposition, eddy currents. The interaction between the inductive currents and the induced eddy currents generates a magnetic pressure tending to stabilize the steel strip. Another solution is to use electromagnets. However, methods of this type imply additional control because of the magnetic attraction force, which tends to make the band unstable. Furthermore, it is known that the high frequency currents implemented cause a rise in temperature in the band, which is contrary to what is sought in this step of the method.
  • the present invention aims to propose a solution to the problem of stabilization of a metal strip in continuous scrolling that allows to overcome the disadvantages of the prior art.
  • the present invention aims to stabilize and / or dampen the vibrations of the strip at the outlet of a bath of liquid metal by means of hydrodynamic means that allow to dissipate the vibration energy generated in the band by installation.
  • the invention also aims to avoid, as suggested in the prior art, the implementation of additional gas jets in the immediate vicinity of the wipers that could affect the appearance of the product final.
  • the invention also aims to horizonambrer the band, and more generally to improve the flatness of the band in the vicinity even where the final thickness of the coating is achieved, that is to say to say the right of the wipers, as well as to guarantee a uniform coating thickness in the plane of the strip.
  • the invention also pursues the goal of providing a solution to the problem of splashing encountered at high speed of scrolling.
  • the present invention relates to a coating installation by dipping a continuous strip metal strip, comprising a liquid metal coating bath which the strip springs vertical strand, a bottom roller, a descaler roller and the if necessary a stabilizing roller, all immersed in the bath of liquid metal, spinning knives placed at the outlet of the bath and injecting a pressurized gas to remove the excess of not yet solidified coating, creating a spinning wave having a return flow of liquid metal directed downwards, and a dissipative hydrodynamic stabilization device placed between the spin knives and the last submerged roll, comprising a plurality of hydrodynamic pads for loading on at least one side of the metal strip and pivotally mounted around joints for self-alignment thereof, further extending transversely across the width of the web, and positioned so that in use the liquid metal return flow of the spinning wave at least partially flows through the back of the pads, that is to say on the face thereof not being vis-à-vis the metal strip in continuous scrolling.
  • the installation furthermore comprises at least one of the following characteristics, or an appropriate combination of several of these:
  • each pad is of a non-wetting nature for the liquid metal or is provided with a non-wetting coating;
  • the distal end of the pads relative to the liquid metal bath is in the spin zone, is tapered and can ensure a pre-spin coating by limiting the risk of splashing;
  • the pads are either completely emerged, or partially or totally immersed in the liquid metal;
  • the installation comprises external means for preheating the pads
  • the pads situated on the same side of the strip are essentially parallel to one another and separated by an interval in the direction transverse to the running of the strip;
  • the pads located on the same side of the strip are in lateral contact via a ceramic felt placed in this interval;
  • the pads located on the same side of the strip are in lateral contact imbricated via a baffling
  • the installation comprises a pneumatic jack for the independent loading of each pad
  • the pneumatic jack is assisted by a spring-damper assembly; the pads are arranged on each side of the strip essentially facing each other in pairs;
  • the pads are arranged on each side of the band and staggered;
  • the pads are controlled in groups or individually by an industrial programmable controller that provides at least one measurement of the camber of the band, a fault analysis and a closed-loop correction of the forces applied to the pads.
  • the installation of the invention will find a preferred application in the context of an industrial process of hot dip coating continuously a metal strip having a speed of travel preferably between 0.5 and> 3 m / s (30 and> 180 m / min), more preferably up to 10 m / s (600 m / min).
  • the metal strip will preferably be made of steel, aluminum, zinc, copper or one of their alloys.
  • the thickness of the metal strip will preferably be between 0.15 and 5 mm.
  • the molten coating metal will preferably comprise zinc, aluminum, tin, magnesium, silicon or an alloy of at least two of these elements.
  • the thickness of the metal coating layer obtained after spinning will preferably be between 3 and 50 ⁇ .
  • the pressurized gas injected by the gas strippers will preferably be air, nitrogen or carbon dioxide.
  • Figure 1 shows a vertical sectional view of the hydrodynamic stabilization device of a metal strip according to the present invention.
  • FIG. 2 represents a top view of the band between the spinning knives, schematically showing the distance Z between the knives and the ideal reference plane of the band, the bending defect Az) c and the displacement ⁇ ) ⁇ corresponding to the vibrations.
  • FIG. 3 is a cross-sectional view of the spinning wave showing schematically the splashing phenomenon, on the one hand, and the spinning wave in the presence of the end of the hydrodynamic pad, on the other hand; .
  • Figure 4 shows an elevational view of three preferred embodiments of the present invention, relating to the channels present on the back of each pad on the one hand and relating to the interface between adjacent pads on the other hand.
  • FIG. 5 represents a plan view of two preferred embodiments of the present invention, showing the relative disposition of the pads on either side of the strip, according to its camber defect with respect to a plane of reference. Description of preferred embodiments of the invention
  • Figure 1 shows schematically a preferred embodiment of the hydrodynamic stabilization device of the invention disposed opposite the steel strip 1 animated with a continuous upward movement (c ') that is to say in vertical strand), after passing through the bottom roller 4, the stamper roller 5a and optionally by the stabilizing roller 5b of the liquid zinc bath 2 and before it passes right of the spinning knives 3.
  • the device of the invention is essentially in the form of at least one, but generally several, hydrodynamic pads 6 self-aligned (or self-aligning), pivotally mounted around a joint 7. It is understood that skids rigid planar devices such as plates. They can either be arranged outside the bath 2, or have a partially submerged portion 8, or be completely immersed.
  • the loading of the pads 6 is intended to balance the hydrodynamic lift generated within the liquid metal film at the strip-pad interface, but also to smooth the strip 1 at its outlet from the bath 2.
  • skids 6 completely emerged or completely immersed advantageously to avoid trapping foam on the surface of the bath mainly at the start of the line, while fully emerged pads promote stabilization at most near the wringers.
  • skates 6 partially or completely immersed allow to promote the preheating and temperature maintenance of the pad by heat conduction via direct contact with the bath. This also makes it possible to take advantage of the speed profile in the vicinity of the strip, just before it leaves the bath and thus significantly improve the hydrodynamic lift (Rhydrodyn.), The thicknesses at the interface and therefore the operational safety vis- against a risk of contact between the pads and the band.
  • camber defects Az) c and displacements ⁇ ) ⁇ due to vibration will correspond to variations in coating thickness.
  • the band is closer to a wiper than the reference plane 12 which is by definition at equal distance Z spinning knives, the final coating thickness will be lower, and vice versa.
  • the camber leads to a continuous variation of thickness over the bandwidth. Vibrations in rigid mode or "string” lead to an alternation of thickness variations in the direction of travel, while higher order vibrations (“twisting" or “flapping”) lead to variations affecting both the longitudinal direction than the transverse direction.
  • the device presented here is therefore aimed at to overcome these different variations in order to obtain a flat and stable strip right to the wringing knives and consequently to ensure a uniform coating thickness in both directions of the plane of the strip.
  • the effectiveness will be d as much better than the back of the pad 6, that is to say its opposite side to the strip, is rendered non-wetting, by nature or by deposition of a suitable coating. Indeed, a portion of the return flow will flow to the back of the pads 6 and it is necessary to prevent the liquid metal finally freeze at this location.
  • each pad 6 takes place on at least one side of the strip 1, and extend transversely substantially over the entire width of the strip 1. Also for the reason explained above, the back of each pad 6 advantageously has at least one channel or grooves 17 for channeling the return flow outside the supports of the joints.
  • the pads 6 are optionally separated by a certain distance in the transverse direction and are essentially parallel to each other. In the opposite case, they may possibly be in contact via a ceramic felt 18 or may be nested thanks to a reported baffling 19 at their adjacent sides opposing the upward flow, which limits the risk of having an extra thickness of coating at this point, after spinning.
  • the pads 6 are staggered on either side of the band 1 shown with its camber defect with respect to the reference plane 12.
  • an industrial programmable logic controller PLC can be added the device for better control of the result by advantageously allowing a measurement of the camber, a fault analysis and a closed-loop correction of the forces (Fi).
  • the pads 6 face each other on both sides of the band 1.
  • a PLC closed-loop measurement, analysis and correction system can be advantageously envisaged.
  • the invention makes it possible, at least under certain operating conditions, to dispense with the stamper roller 5a and the stabilizer roller 5b, which is all the more advantageous as these are additional vibration generators due to wear. of their immersed bearings, that they are also generators of mattes and that their maintenance as their replacement require line stops impacting the productivity of the plant.

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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)
  • Coating With Molten Metal (AREA)
  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Drying Of Solid Materials (AREA)
EP17700271.4A 2016-01-29 2017-01-10 Vorrichtung zur hydrodynamischen stabilisierung eines kontinuierlich laufenden metallbandes Active EP3408424B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL17700271T PL3408424T3 (pl) 2016-01-29 2017-01-10 Urządzenie do stabilizacji hydrodynamicznej taśmy metalowej przesuwającej się w sposób ciągły

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE2016/5073A BE1023837B1 (fr) 2016-01-29 2016-01-29 Dispositif pour la stabilisation hydrodynamique d'une bande metallique en defilement continu
PCT/EP2017/050379 WO2017129391A1 (fr) 2016-01-29 2017-01-10 Dispositif pour la stabilisation hydrodynamique d'une bande métallique en défilement continu

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US20190032188A1 (en) 2019-01-31
RU2018128792A (ru) 2020-03-03
US10550459B2 (en) 2020-02-04
EP3408424B1 (de) 2020-03-18
ES2790198T3 (es) 2020-10-27
BR112018015424A2 (pt) 2018-12-18
CN109072395B (zh) 2021-02-26
BE1023837B1 (fr) 2017-08-09
JP2019504926A (ja) 2019-02-21
CN109072395A (zh) 2018-12-21
RU2715933C2 (ru) 2020-03-04
UA122708C2 (uk) 2020-12-28
ZA201804419B (en) 2019-05-29
CA3011266C (fr) 2023-05-02
RU2018128792A3 (de) 2020-03-03
KR20180103992A (ko) 2018-09-19
PL3408424T3 (pl) 2020-08-10
JP6869248B2 (ja) 2021-05-12
CA3011266A1 (fr) 2017-08-03
WO2017129391A1 (fr) 2017-08-03
BE1023837A1 (fr) 2017-08-08
BR112018015424B1 (pt) 2022-04-12

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