EP3221487B1 - Method and device for coating a metal strip - Google Patents

Method and device for coating a metal strip Download PDF

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Publication number
EP3221487B1
EP3221487B1 EP15777639.4A EP15777639A EP3221487B1 EP 3221487 B1 EP3221487 B1 EP 3221487B1 EP 15777639 A EP15777639 A EP 15777639A EP 3221487 B1 EP3221487 B1 EP 3221487B1
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EP
European Patent Office
Prior art keywords
metal strip
blowing device
correction roller
coating
slot
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.)
Active
Application number
EP15777639.4A
Other languages
German (de)
French (fr)
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EP3221487A1 (en
Inventor
Dominique Fontaine
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.)
Fontaine Engineering und Maschinen GmbH
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Fontaine Engineering und Maschinen GmbH
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Filing date
Publication date
Application filed by Fontaine Engineering und Maschinen GmbH filed Critical Fontaine Engineering und Maschinen GmbH
Priority to PL15777639T priority Critical patent/PL3221487T3/en
Priority to SI201530605T priority patent/SI3221487T1/en
Publication of EP3221487A1 publication Critical patent/EP3221487A1/en
Application granted granted Critical
Publication of EP3221487B1 publication Critical patent/EP3221487B1/en
Priority to HRP20190156TT priority patent/HRP20190156T1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • C23C2/14—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
    • 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
    • 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
    • B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
    • B05C3/02—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material
    • 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
    • B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
    • B05C3/02—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material
    • B05C3/12—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material for treating work of indefinite length
    • B05C3/125—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material for treating work of indefinite length the work being a web, band, strip or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/007—After-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
    • B05D3/0466—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being a non-reacting gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003—Apparatus
    • C23C2/0034—Details related to elements immersed in bath
    • C23C2/00342—Moving elements, e.g. pumps or mixers
    • C23C2/00344—Means for moving substrates, e.g. immersed rollers or immersed bearings
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003—Apparatus
    • C23C2/0035—Means for continuously moving substrate through, into or out of the bath
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/50—Controlling or regulating the coating processes
    • C23C2/52—Controlling or regulating the coating processes with means for measuring or sensing
    • C23C2/524—Position of the substrate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2202/00—Metallic substrate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2252/00—Sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2252/00—Sheets
    • B05D2252/02—Sheets of indefinite length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2252/00—Sheets
    • B05D2252/04—Sheets of definite length in a continuous process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2252/00—Sheets
    • B05D2252/10—Applying the material on both sides

Definitions

  • the invention relates to a method and apparatus for coating a metal strip with an initially liquid coating material, for. As zinc.
  • the method and the device are used in particular for hot-dip galvanizing the metal strip.
  • Such devices for coating a metal strip are basically known in the art, such. B. from the DE 10 2009 051 932 A1 , Specifically, this document discloses a coating container which is filled with liquid coating material. For coating, the metal strip is passed through the container with the coating material. After leaving the coating container, the metal strip passes through a blow-off device arranged above the coating container for blowing off excess parts of the still liquid coating material from the surface of the metal strip. Above the blow-off device, an electromagnetic stabilization device supported by the blow-off device is arranged to stabilize the metal strip after leaving the coating container and the blow-off device. In particular, the electromagnetic stabilizing device causes the band to be held centrally in a center plane of the entire apparatus and to prevent or at least reduce vibrations of the metal band during passage through the coating container and the blower.
  • Both the blow-off device and the electromagnetic stabilization device each have a slot through which the metal strip is guided.
  • the metal strip runs in a predetermined desired center position through the slot of the blower. Only then is it ensured that the effect of the blow-off nozzles of the blower on the top and bottom of the metal strip is the same and sets a desired uniform thickness distribution of the coating material on the metal strip.
  • the desired center position is defined in particular by a preferably uniform spacing of the broad sides and the narrow sides of the metal strip relative to the opposing nozzles of the blow-off device and in particular in that the metal strip is not inclined, twisted or excessively curved relative to the longitudinal orientation of the slot or nozzles ,
  • the German patent application DE 10 2007 042 897 A1 discloses a method with a device for coating a metal strip with a coating material, eg zinc.
  • the metal strip is passed through a coating container, which with the liquid coating material is filled, wherein the coating material adheres to the surface of the metal strip.
  • the metal strip passes through a slot of a blow-off device, which serves to blow off excess parts of the still liquid coating material from the surface of the metal strip.
  • a curvature sensor is provided for detecting the actual curvature of the metal strip after leaving the coating container. If the detected actual curvature exceeds a predetermined allowable curvature threshold, a correction roller is turned against the metal belt to smooth it. It is also disclosed that the blower is controlled.
  • the publication DE 43 00 868 C1 teaches to position the blower by means of adjusting drives so that the distance between the nozzle gap and the belt surface remains constant.
  • the corresponding control or regulation of the position of the blow-off device takes place as a function of the actual position of the metal strip, which is detected continuously by a separate measuring device.
  • the WO 94/02658 A1 teaches that, at least implicitly, a camber sensor is provided for detecting the camber of the metal strip above the blower. If too much curvature is detected, so that there is a risk of contact between the belt and the blower, the blower is moved transversely to the metal belt level, as long as over the entire width of the metal strip, a minimum distance between the metal strip and the discharge again is complied with.
  • the JP 2003 113460 A provides a (displacement value) arranged in the electromagnetic stabilization device so-called displacement sensor, which is formed, the curvature state or the extent of eccentricity of the metal strip in the slot of the electromagnetic stabilization device capture.
  • the electromagnets of the electromagnetic stabilization device are energized in order to generate magnetic forces on the metal strip in such a way that the curvature and the path position of the metal strip are corrected.
  • a stabilizing roller and the correction roller are controlled or positioned in the metal bath by means of a process control device as a function of the initial values.
  • Scraper nozzles are also controlled and positioned according to a mathematically determined eccentricity index, specifically such that the index or the eccentricity of the metal strip is within or below a predetermined threshold value.
  • the wiper nozzles and the electromagnetic blocks or the electromagnetic stabilizer are each moved in parallel by the same amount.
  • the invention has the object of developing a known method and a known device of the type mentioned for coating a metal strip to the effect that an uneven thickness distribution of the coating on the metal strip is prevented due to the employment of the correction roller.
  • a first embodiment can serve as a criterion or as a measure of the displacement of the blower in addition to the employment of the correction roller and the previously detected deviation of the actual position of the metal strip of its desired center position.
  • This criterion offers the advantage that there is a fairly accurate indication of the necessary displacement of the blower.
  • the stabilizer mechanically supports on the upstream blower.
  • the electromagnetic stabilizer is also referred to by the applicant as Dynamic Electro Magnetic Coating Optimizer DEMCO.
  • the object of the invention is further achieved device technology by a device according to claim 4.
  • the advantages of this solution correspond to the advantages mentioned above with respect to the claimed method.
  • Advantageous embodiments of the device are the subject of the dependent claims.
  • FIG. 1 shows the inventive device 100 for coating a metal strip 200 with a liquid coating material 300, z.
  • a liquid coating material 300 As zinc.
  • the initially uncoated metal strip 200 is conducted in the transport direction R in a coating container 110, which is filled with the liquid coating material.
  • the metal strip 200 Within the coating container 110, the metal strip 200 is deflected by means of a deflection roller 115, so that it leaves the coating container upwards. After passing through the coating container, the still liquid coating material adheres to the metal strip 200.
  • the guide roller 115 is downstream of a pair of rollers in the transport direction R of the metal strip 200, between which the coated metal strip is passed.
  • the pair of rollers is typically disposed within the coating container 110 such that it is surrounded by the coating material 300 in the performance of the coating process.
  • One of the rollers can be adjusted as a correction roller 160 against the other roller of the pair of rollers to smooth the metal strip in the presence of unwanted curvature.
  • the degree of curvature of the metal strip 200 is detected by means of a buckling sensor 154 and compared with a predetermined buckling threshold. The comparison can be carried out in a control device 190. If the extent of the curvature is greater than the curvature threshold value, then the correction roller, actuated by the control device 190, is turned against the metal strip.
  • the pair of rollers is downstream of a blower 120 in the transport direction R of the metal strip, which spans a slot 122 through which the metal strip 200 is guided. With the help of the blower excess coating material is blown off the surface of the metal strip 200.
  • the blower 120 to detect an electromagnetic stabilizer 140, which in turn has a slot 142 through which the metal strip 200 is also guided.
  • the metal strip 200 preferably passes through the slot 142 in a predetermined desired center position 128, as in FIG FIG. 2 shown so that the forces provided by the electromagnetic stabilizer 140 forces can act in a desired manner uniformly stabilizing the metal strip 200.
  • a position sensor For detecting a deviation of the actual position of the metal strip 200 from a predetermined desired center position in the slot 122 of the blower 120, a position sensor is provided. Furthermore, a control device 180 is provided as a rule, the actual position of the metal strip 200 to the predetermined desired center position in the slot 122 of the blower, as described above with reference to FIG. 2 explained by displacement of the blower 120 by means of a displacement device 130. The displacement takes place in a plane transverse to the transport direction R of the metal strip. The regulation is carried out in response to the detected by the position sensor 152 deviation of the actual position of the desired center position of the metal strip 200.
  • the control can also be carried out with additional consideration of the extent of the curvature of the metal strip detected by the curvature sensor 154.
  • the position sensor 152 and the camber sensor 154 are both part of a metal belt detector 150.
  • the function of the position sensor 152 and the camber sensor 154 may, according to one embodiment, be realized by a single typically laser-based sensor device, also called “laser” for short; the position sensor 152 and the curvature sensor 154 then form a structural unit in the form of the sensor device or the metal strip detection device.
  • the displacement of the blower 120 can take place in accordance with the detected deviation of the actual position of the metal strip from the predetermined desired center position in the slot 122 of the blower.
  • the blower 120 is displaced by means of the displacement device 130 such that the metal strip returns the slot 122 of the blower back to the predetermined desired center position 128 passes through to ensure the desired uniform coating.
  • the displacement of the blow-off device 120 may also take into account the setting position of the correction roller 160 or... Detected by a correction roller detection device 165 their change takes place.
  • the output of the correction roller detecting means 165 is also coupled to the input of the control means 180. In this way, the displacement of the blower would be improved in view of a desired maximization of the uniformity of the coating.
  • the correction roller detection device 165 may be designed in the form of two encoders, one of which in each case sits on a respective drive of the correction roller 160.
  • the metal strip and correction roller detection devices 150, 165 are designed to detect, preferably, all conceivable deviations of an actual position of the metal strip from the desired desired center position. These include, in particular, a (parallel) displacement of the metal strip in the x or y direction or a rotation, as described above with reference to FIG FIG. 2 explained.
  • the displacement device 130 - with suitable control by the control device 180 - is designed to move the blower 120 in a plane transverse to the transport direction R the metal strip in any way, in particular (parallel) to move or twist to the passage of the metal strip in to realize the desired center position.
  • the representation of the displacement device 130 as a piston-cylinder unit is insofar only exemplary, but not limiting.

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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)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Coating Apparatus (AREA)
  • Coating With Molten Metal (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Beschichten eines Metallbandes mit einem zunächst noch flüssigen Beschichtungsmaterial, z. B. Zink. Das Verfahren und die Vorrichtung dienen insbesondere zum Feuerverzinken des Metallbandes.The invention relates to a method and apparatus for coating a metal strip with an initially liquid coating material, for. As zinc. The method and the device are used in particular for hot-dip galvanizing the metal strip.

Derartige Vorrichtungen zum Beschichten eines Metallbandes sind im Stand der Technik grundsätzlich bekannt, so z. B. aus der DE 10 2009 051 932 A1 . Konkret offenbart diese Druckschrift einen Beschichtungsbehälter, welcher mit flüssigem Beschichtungsmaterial befüllt ist. Zum Beschichten wird das Metallband durch den Behälter mit dem Beschichtungsmaterial geleitet. Nach dem Verlassen des Beschichtungsbehälters durchläuft das Metallband eine oberhalb des Beschichtungsbehälters angeordnete Abblaseinrichtung zum Abblasen von überflüssigen Teilen des noch flüssigen Beschichtungsmaterials von der Oberfläche des Metallbandes. Oberhalb der Abblaseinrichtung ist eine von der Abblaseinrichtung gestützte elektromagnetische Stabilisierungseinrichtung angeordnet zur Stabilisierung des Metallbandes nach Verlassen des Beschichtungsbehälters und der Abblaseinrichtung. Die elektromagnetische Stabilisierungseinrichtung bewirkt insbesondere, dass das Band mittig in einer Mittenebene der gesamten Vorrichtung gehalten wird und dass Schwingungen des Metallbandes während des Durchlaufens durch den Beschichtungsbehälter und die Abblaseinrichtung verhindert oder zumindest reduziert werden.Such devices for coating a metal strip are basically known in the art, such. B. from the DE 10 2009 051 932 A1 , Specifically, this document discloses a coating container which is filled with liquid coating material. For coating, the metal strip is passed through the container with the coating material. After leaving the coating container, the metal strip passes through a blow-off device arranged above the coating container for blowing off excess parts of the still liquid coating material from the surface of the metal strip. Above the blow-off device, an electromagnetic stabilization device supported by the blow-off device is arranged to stabilize the metal strip after leaving the coating container and the blow-off device. In particular, the electromagnetic stabilizing device causes the band to be held centrally in a center plane of the entire apparatus and to prevent or at least reduce vibrations of the metal band during passage through the coating container and the blower.

Sowohl die Abblaseinrichtung wie auch die elektromagnetische Stabilisierungseinrichtung weisen jeweils einen Schlitz auf, durch welchen das Metallband geführt ist. Um eine gleichmäßige Dicke bzw. Dickenverteilung des Beschichtungsmaterials auf der Ober- und Unterseite des Metallbandes zu erreichen, ist es zwingend erforderlich, dass das Metallband in einer vorgegebenen Soll-Mittenlage durch den Schlitz der Abblaseinrichtung läuft. Nur dann ist gewährleistet, dass die Wirkung der Abblasdüsen der Abblaseinrichtung auf der Ober- und Unterseite des Metallbandes gleich ist und sich eine gewünschte gleichmäßige Dickenverteilung des Beschichtungsmaterials auf dem Metallband einstellt.Both the blow-off device and the electromagnetic stabilization device each have a slot through which the metal strip is guided. In order to achieve a uniform thickness or thickness distribution of the coating material on the top and bottom of the metal strip, it is imperative that the metal strip runs in a predetermined desired center position through the slot of the blower. Only then is it ensured that the effect of the blow-off nozzles of the blower on the top and bottom of the metal strip is the same and sets a desired uniform thickness distribution of the coating material on the metal strip.

Die Soll-Mittenlage ist insbesondere definiert durch einen vorzugsweise gleichmäßigen Abstand der Breitseiten und der Schmalseiten des Metallbandes zu den gegenüberliegenden Düsen der Abblaseinrichtung und insbesondere dadurch, dass das Metallband gegenüber der Längsausrichtung des Schlitzes bzw. der Düsen nicht geneigt, verdreht oder zu stark gewölbt ist.The desired center position is defined in particular by a preferably uniform spacing of the broad sides and the narrow sides of the metal strip relative to the opposing nozzles of the blow-off device and in particular in that the metal strip is not inclined, twisted or excessively curved relative to the longitudinal orientation of the slot or nozzles ,

In der Praxis kann es jedoch vorkommen, dass das Metallband nach Verlassen des Beschichtungsbehälters stark gewölbt ist. Eine solche Wölbung ist, wie gesagt, unerwünscht insbesondere für das Durchlaufen der Abblaseinrichtung. Der Wölbung wird deshalb traditionell entgegengewirkt, indem eine Korrekturrolle gegen das Metallband angestellt wird, bevor das Metallband in die Abblaseinrichtung eintritt. Dies hat jedoch den Nachteil, dass dadurch die Ist-Lage, mit welcher das Metallband den Schlitz der Abblaseinrichtung durchläuft, von der Soll-Mittenlage abweichen kann, was zu dem oben beschriebenen Problem einer ungleichmäßigen Dickenverteilung der Beschichtung führen kann.In practice, however, it may happen that the metal strip is heavily curved after leaving the coating container. Such a curvature is, as I said, undesirable in particular for the passage of the blower. The buckle is therefore traditionally counteracted by applying a correction roller against the metal band before the metal band enters the blower. However, this has the disadvantage that thereby the actual position, with which the metal strip passes through the slot of the blower, may deviate from the desired center position, which may lead to the above-described problem of uneven thickness distribution of the coating.

Die deutsche Offenlegungsschrift DE 10 2007 042 897 A1 offenbart ein Verfahren mit einer Vorrichtung zum Beschichten eines Metallbandes mit einem Beschichtungsmaterial, z.B. Zink. Zu diesem Zweck wird das Metallband durch einen Beschichtungsbehälter geleitet, welcher mit dem flüssigen Beschichtungsmaterial gefüllt ist, wobei das Beschichtungsmaterial an der Oberfläche des Metallbandes anhaftet. Nach dem Verlassen des Beschichtungsbehälters durchläuft das Metallband einen Schlitz einer Abblaseinrichtung, welche dazu dient, überschüssige Teile des noch flüssigen Beschichtungsmaterials von der Oberfläche des Metallbandes abzublasen. Weiterhin ist ein Wölbungssensor vorgesehen zum Erfassen der Ist-Wölbung des Metallbandes nach Verlassen des Beschichtungsbehälters. Sofern die erfasste Ist-Wölbung einen vorgegebenen zulässigen Wölbungs-Schwellenwert überschreitet, wird eine Korrekturrolle gegen das Metallband angestellt, um dieses zu glätten. Es ist auch offenbart, dass die Abblaseinrichtung angesteuert wird.The German patent application DE 10 2007 042 897 A1 discloses a method with a device for coating a metal strip with a coating material, eg zinc. For this purpose, the metal strip is passed through a coating container, which with the liquid coating material is filled, wherein the coating material adheres to the surface of the metal strip. After leaving the coating container, the metal strip passes through a slot of a blow-off device, which serves to blow off excess parts of the still liquid coating material from the surface of the metal strip. Furthermore, a curvature sensor is provided for detecting the actual curvature of the metal strip after leaving the coating container. If the detected actual curvature exceeds a predetermined allowable curvature threshold, a correction roller is turned against the metal belt to smooth it. It is also disclosed that the blower is controlled.

Die Druckschrift DE 43 00 868 C1 lehrt, die Abblaseinrichtung mit Hilfe von Verstellantrieben so zu positionieren, dass der Abstand zwischen Düsenspalt und Bandoberfläche konstant bleibt. Die entsprechende Steuerung bzw. Regelung der Lage der Abblaseinrichtung erfolgt in Abhängigkeit der tatsächlichen Lage des Metallbandes, welche von einer separaten Messeinrichtung kontinuierlich erfasst wird.The publication DE 43 00 868 C1 teaches to position the blower by means of adjusting drives so that the distance between the nozzle gap and the belt surface remains constant. The corresponding control or regulation of the position of the blow-off device takes place as a function of the actual position of the metal strip, which is detected continuously by a separate measuring device.

Die WO 94/02658 A1 lehrt, dass zumindest implizit ein Wölbungssensor vorgesehen ist zum Erfassen der Wölbung des Metallbandes oberhalb der Abblaseinrichtung. Wenn eine zu starke Wölbung festgestellt wird, so dass eventuell die Gefahr einer Berührung zwischen Band und der Abblaseinrichtung besteht, wird die Abblaseinrichtung quer zur Ebene des Metallbandes verfahren, so lange, bis über der gesamten Breite des Metallbandes ein Mindestabstand zwischen Metallband und der Ablasseinrichtung wieder eingehalten ist.The WO 94/02658 A1 teaches that, at least implicitly, a camber sensor is provided for detecting the camber of the metal strip above the blower. If too much curvature is detected, so that there is a risk of contact between the belt and the blower, the blower is moved transversely to the metal belt level, as long as over the entire width of the metal strip, a minimum distance between the metal strip and the discharge again is complied with.

Die JP 2003 113460 A sieht einen (Zahlwert) in der elektromagnetischen Stabilisierungseinrichtung angeordneten sogenannten Verschiebungssensor vor, welcher ausgebildet ist, den Krümmungszustand bzw. das Ausmaß der Außermittigkeit des Metallbandes in dem Schlitz der elektromagnetischen Stabilisierungseinrichtung zu erfassen. In Abhängigkeit des Ausmaßes der Außermittigkeit des Metallbandes werden die Elektromagnete der elektromagnetischen Stabilisierungseinrichtung bestromt, um Magnetkräfte auf das Metallband derart zu generieren, dass die Krümmung und die Pfadposition des Metallstreifens korrigiert werden. Eine Stabilisierungswalze und die Korrekturwalze werden in dem Metallbad mit Hilfe einer Prozesssteuervorrichtung in Abhängigkeit der Ausgangswerte angesteuert bzw. positioniert. Auch Abstreiferdüsen werden entsprechend einem mathematisch ermittelten Außermittigkeitsindex angesteuert und positioniert und zwar so, dass der Index bzw. die Außermittigkeit des Metallbandes innerhalb bzw. unterhalb eines vorgegebenen Schwellenwertes liegt. Die Abstreiferdüsen und die elektromagnetischen Blöcke bzw. die elektromagnetische Stabilisierungseinrichtung werden jeweils parallel um das gleiche Ausmaß bewegt.The JP 2003 113460 A provides a (displacement value) arranged in the electromagnetic stabilization device so-called displacement sensor, which is formed, the curvature state or the extent of eccentricity of the metal strip in the slot of the electromagnetic stabilization device capture. Depending on the extent of the eccentricity of the metal strip, the electromagnets of the electromagnetic stabilization device are energized in order to generate magnetic forces on the metal strip in such a way that the curvature and the path position of the metal strip are corrected. A stabilizing roller and the correction roller are controlled or positioned in the metal bath by means of a process control device as a function of the initial values. Scraper nozzles are also controlled and positioned according to a mathematically determined eccentricity index, specifically such that the index or the eccentricity of the metal strip is within or below a predetermined threshold value. The wiper nozzles and the electromagnetic blocks or the electromagnetic stabilizer are each moved in parallel by the same amount.

Der Erfindung liegt die Aufgabe zugrunde, ein bekanntes Verfahren und eine bekannte Vorrichtung der eingangs genannten Art zum Beschichten eines Metallbandes dahingehend weiterzubilden, dass eine ungleichmäßige Dickenverteilung der Beschichtung auf dem Metallband aufgrund der Anstellung der Korrekturrolle verhindert wird.The invention has the object of developing a known method and a known device of the type mentioned for coating a metal strip to the effect that an uneven thickness distribution of the coating on the metal strip is prevented due to the employment of the correction roller.

Diese Aufgabe wird verfahrenstechnisch durch das im Patentanspruch 1 beanspruchte Verfahren gelöst.This object is procedurally achieved by the method claimed in claim 1.

Durch die beanspruchte Verlagerung der Abblaseinrichtung derart, dass das Metallband in dem Schlitz der Abblaseinrichtung wieder in der vorgegebenen Soll-Mittenlage liegt, wird vorteilhafterweise erreicht, dass eine ungleichmäßige Dickenverteilung der Beschichtung auf dem Metallband aufgrund der Anstellung der Korrekturrolle bzw. aufgrund einer Veränderung der Anstellung der Korrekturrolle verhindert wird.By the claimed displacement of the blower such that the metal strip is in the slot of the blower back in the predetermined desired center position, is advantageously achieved that an uneven thickness distribution the coating on the metal strip due to the employment of the correction roller or due to a change in the employment of the correction roller is prevented.

Gemäß einem ersten Ausführungsbeispiel kann als Kriterium bzw. als Maß für die Verlagerung der Abblaseinrichtung zusätzlich zu der Anstellung der Korrekturrolle auch die zuvor erfasste Abweichung der Ist-Lage des Metallbandes von seiner Soll-Mittenlage dienen. Dieses Kriterium bietet den Vorteil, dass es einen recht genauen Anhaltspunkt über die notwendige Verlagerung der Abblaseinrichtung gibt.According to a first embodiment can serve as a criterion or as a measure of the displacement of the blower in addition to the employment of the correction roller and the previously detected deviation of the actual position of the metal strip of its desired center position. This criterion offers the advantage that there is a fairly accurate indication of the necessary displacement of the blower.

Gemäß einem weiteren Ausführungsbeispiel ist vorgesehen, das Metallband nach dem Verlassen des Beschichtungsbehälters und der Abblaseinrichtung mit Hilfe einer oberhalb der Abblaseinrichtung angeordneten elektromagnetischen Stabilisierungseinrichtung insbesondere gegen unerwünschte Schwingungen zu stabilisieren. Typischerweise stützt sich die Stabilisierungseinrichtung auf der vorgelagerten Abblaseinrichtung mechanisch ab. Die elektromagnetische Stabilisierungseinrichtung wird von der Anmelderin auch als Dynamic Electro Magnetic Coating Optimizer DEMCO bezeichnet.According to a further embodiment, it is provided to stabilize the metal strip after leaving the coating container and the blow-off device with the aid of an electromagnetic stabilizing device arranged above the blow-off device, in particular against unwanted vibrations. Typically, the stabilizer mechanically supports on the upstream blower. The electromagnetic stabilizer is also referred to by the applicant as Dynamic Electro Magnetic Coating Optimizer DEMCO.

Die Aufgabe der Erfindung wird weiterhin vorrichtungstechnisch durch eine Vorrichtung gemäß Anspruch 4 gelöst. Die Vorteile dieser Lösung entsprechen den oben mit Bezug auf das beanspruchte Verfahren genannten Vorteilen. Vorteilhafte Ausgestaltungen der Vorrichtung sind Gegenstand der abhängigen Ansprüche.The object of the invention is further achieved device technology by a device according to claim 4. The advantages of this solution correspond to the advantages mentioned above with respect to the claimed method. Advantageous embodiments of the device are the subject of the dependent claims.

Der Beschreibung sind zwei Figuren beigefügt, wobei

Figur 1
die erfindungsgemäße Vorrichtung in einer Gesamtansicht; und
Figur 2
eine Draufsicht auf den Schlitz der Abblaseinrichtung zeigt.
The description is attached to two figures, wherein
FIG. 1
the device according to the invention in an overall view; and
FIG. 2
a plan view of the slot of the blower shows.

Die Erfindung wird nachfolgend in Form von Ausführungsbeispielen unter Bezugnahme auf die genannten Figuren detailliert beschrieben. In beiden Figuren sind gleiche technische Elemente mit gleichen Bezugszeichen bezeichnet.The invention will now be described in detail in the form of embodiments with reference to said figures. In both figures, the same technical elements are designated by the same reference numerals.

Figur 1 zeigt die erfindungsgemäße Vorrichtung 100 zum Beschichten eines Metallbandes 200 mit einem flüssigen Beschichtungsmaterial 300, z. B. Zink. Zu diesem Zweck wird das zunächst noch unbeschichtete Metallband 200 in Transportrichtung R in einen Beschichtungsbehälter 110 geleitet, welcher mit dem flüssigen Beschichtungsmaterial befüllt ist. Innerhalb des Beschichtungsbehälters 110 wird das Metallband 200 mit Hilfe einer Umlenkrolle 115 umgelenkt, so dass es den Beschichtungsbehälter nach oben verlässt. Nach dem Durchlaufen des Beschichtungsbehälters haftet das noch flüssige Beschichtungsmaterial an dem Metallband 200. FIG. 1 shows the inventive device 100 for coating a metal strip 200 with a liquid coating material 300, z. As zinc. For this purpose, the initially uncoated metal strip 200 is conducted in the transport direction R in a coating container 110, which is filled with the liquid coating material. Within the coating container 110, the metal strip 200 is deflected by means of a deflection roller 115, so that it leaves the coating container upwards. After passing through the coating container, the still liquid coating material adheres to the metal strip 200.

Der Umlenkrolle 115 ist in Transportrichtung R des Metallbandes 200 ein Rollenpaar nachgeordnet, zwischen welchem das beschichtete Metallband hindurchgeführt ist. Das Rollenpaar ist typischerweise innerhalb des Beschichtungsbehälters 110 derart angeordnet, dass es bei der Durchführung des Beschichtungsprozesses von dem Beschichtungsmaterial 300 umgeben ist. Eine der Rollen ist als Korrekturrolle 160 gegen die andere Rolle des Rollenpaares anstellbar, um das Metallband bei Vorhandensein von unerwünschter Wölbung zu glätten. Zu diesem Zweck wird das Ausmaß der Wölbung des Metallbandes 200 mit Hilfe eines Wölbungssensors 154 erfasst und mit einem vorgegebenen Wölbungs-Schwellenwert verglichen. Der Vergleich kann in einer Steuereinrichtung 190 erfolgen. Ist das Ausmaß der Wölbung größer als der Wölbungsschwellenwert, so wird die Korrekturrolle, angesteuert von der Steuereinrichtung 190, gegen das Metallband angestellt.The guide roller 115 is downstream of a pair of rollers in the transport direction R of the metal strip 200, between which the coated metal strip is passed. The pair of rollers is typically disposed within the coating container 110 such that it is surrounded by the coating material 300 in the performance of the coating process. One of the rollers can be adjusted as a correction roller 160 against the other roller of the pair of rollers to smooth the metal strip in the presence of unwanted curvature. For this purpose, the degree of curvature of the metal strip 200 is detected by means of a buckling sensor 154 and compared with a predetermined buckling threshold. The comparison can be carried out in a control device 190. If the extent of the curvature is greater than the curvature threshold value, then the correction roller, actuated by the control device 190, is turned against the metal strip.

Dem Rollenpaar ist in Transportrichtung R des Metallbandes eine Abblaseinrichtung 120 nachgeordnet, welche einen Schlitz 122 aufspannt, durch welchen das Metallband 200 geführt ist. Mit Hilfe der Abblaseinrichtung wird überschüssiges Beschichtungsmaterial von der Oberfläche des Metallbandes 200 abgeblasen.The pair of rollers is downstream of a blower 120 in the transport direction R of the metal strip, which spans a slot 122 through which the metal strip 200 is guided. With the help of the blower excess coating material is blown off the surface of the metal strip 200.

Damit das Abblasen auf der Ober- und Unterseite des Metallbandes 200 gleichmäßig erfolgt, ist es wichtig, dass das Metallband 200 den Schlitz 122 der Abblaseinrichtung 120 in einer vorgegebenen Soll-Mittenlage 128 durchläuft, wie sie in Figur 2 in Form der durchgezogenen Linie in X-Richtung symbolisiert ist. Diese Soll-Mittenlage zeichnet sich insbesondere durch gleichmäßige Abstände bzw. Abstandsverteilungen zu den inneren Rändern des Schlitzes 122 der Abblaseinrichtung 120 aus. Neben der gewünschten vorgegebenen Soll-Mittenlage sind in Figur 2 auch mögliche unerwünschte Ist-Lagen des Metallbandes als gestrichelte Linien eingezeichnet. So bestehen unerwünschte Ist-Lagen für das Metallband beispielsweise darin, dass es gegenüber der Soll-Mittenlage verdreht oder in Y-Richtung parallel verschoben ist.In order for the blow-off on the top and bottom of the metal strip 200 is uniform, it is important that the metal strip 200 passes through the slot 122 of the blower 120 in a predetermined desired center layer 128, as in FIG. 2 is symbolized in the form of the solid line in the X direction. This desired central position is characterized in particular by uniform distances or distance distributions to the inner edges of the slot 122 of the blower 120. In addition to the desired predetermined desired center position are in FIG. 2 also possible unwanted actual layers of the metal strip shown as dashed lines. Thus, undesired actual layers for the metal strip, for example, in that it is rotated relative to the desired center position or moved parallel in the Y direction.

Wieder bezugnehmend auf Figur 1 ist oberhalb der Abblaseinrichtung 120 eine elektromagnetische Stabilisierungseinrichtung 140 zu erkennen, welche ihrerseits einen Schlitz 142 aufweist, durch den das Metallband 200 ebenfalls geführt ist. Auch hier gilt, dass das Metallband 200 den Schlitz 142 vorzugsweise in einer vorgegebenen Soll-Mittenlage 128 durchläuft, wie in Figur 2 gezeigt, damit die durch die elektromagnetische Stabilisierungseinrichtung 140 bereitgestellten Kräfte in gewünschter Weise gleichmäßig auf das Metallband 200 stabilisierend einwirken können.Referring again to FIG. 1 is above the blower 120 to detect an electromagnetic stabilizer 140, which in turn has a slot 142 through which the metal strip 200 is also guided. Again, the metal strip 200 preferably passes through the slot 142 in a predetermined desired center position 128, as in FIG FIG. 2 shown so that the forces provided by the electromagnetic stabilizer 140 forces can act in a desired manner uniformly stabilizing the metal strip 200.

Zum Erfassen einer Abweichung der Ist-Lage des Metallbandes 200 von einer vorgegebenen Soll-Mittenlage in dem Schlitz 122 der Abblaseinrichtung 120 ist ein Lagesensor vorgesehen. Es ist weiterhin eine Regelungseinrichtung 180 vorgesehen zum Regel der Ist-Lage des Metallbandes 200 auf die vorgegebene Soll-Mittenlage in dem Schlitz 122 der Abblaseinrichtung, wie oben unter Bezugnahme auf Figur 2 erläutert, durch Verlagerung der Abblaseinrichtung 120 mit Hilfe einer Verlagerungseinrichtung 130. Die Verlagerung erfolgt in einer Ebene quer zur Transportrichtung R des Metallbandes. Die Regelung erfolgt im Ansprechen auf die von dem Lagesensor 152 erfasste Abweichung der Ist-Lage von der Soll-Mittenlage des Metallbandes 200. Optional kann die Regelung auch unter zusätzlicher Berücksichtigung des von dem Wölbungssensor 154 erfassen Ausmaßes der Wölbung des Metallbandes erfolgen.For detecting a deviation of the actual position of the metal strip 200 from a predetermined desired center position in the slot 122 of the blower 120, a position sensor is provided. Furthermore, a control device 180 is provided as a rule, the actual position of the metal strip 200 to the predetermined desired center position in the slot 122 of the blower, as described above with reference to FIG. 2 explained by displacement of the blower 120 by means of a displacement device 130. The displacement takes place in a plane transverse to the transport direction R of the metal strip. The regulation is carried out in response to the detected by the position sensor 152 deviation of the actual position of the desired center position of the metal strip 200. Optionally, the control can also be carried out with additional consideration of the extent of the curvature of the metal strip detected by the curvature sensor 154.

Der Lagesensor 152 und der Wölbungssensor 154 sind beide Teil einer Metallband-Erfassungseinrichtung 150. Die Funktion des Lagesensors 152 und des Wölbungssensors 154 können gemäß einem Ausführungsbeispiel von einer einzigen typischerweise lasergestützten Sensoreinrichtung, auch kurz "Laser" genannt, realisiert sein; der Lagesensor 152 und der Wölbungssensor 154 bilden dann eine bauliche Einheit in Form der Sensoreinrichtung oder der Metallband-Erfassungseinrichtung.The position sensor 152 and the camber sensor 154 are both part of a metal belt detector 150. The function of the position sensor 152 and the camber sensor 154 may, according to one embodiment, be realized by a single typically laser-based sensor device, also called "laser" for short; the position sensor 152 and the curvature sensor 154 then form a structural unit in the form of the sensor device or the metal strip detection device.

Gemäß einer ersten Alternative kann die Verlagerung der Abblaseinrichtung 120 nach Maßgabe der erfassten Abweichung der Ist-Lage des Metallbandes von der vorgegebenen Soll-Mittenlage in dem Schlitz 122 der Abblaseinrichtung erfolgen. Anders ausgedrückt: Wird festgestellt, dass das Metallband 200 den Schlitz 122 nicht in der Soll-Mittenlage 128 durchläuft, so wird die Abblaseinrichtung 120 mit Hilfe der Verlagerungseinrichtung 130 derart verlagert, dass das Metallband den Schlitz 122 der Abblaseinrichtung wieder in der vorgegebenen Soll-Mittenlage 128 durchläuft, um die gewünschte gleichmäßige Beschichtung zu gewährleisten.According to a first alternative, the displacement of the blower 120 can take place in accordance with the detected deviation of the actual position of the metal strip from the predetermined desired center position in the slot 122 of the blower. In other words, if it is determined that the metal strip 200 does not pass through the slot 122 in the desired center layer 128, the blower 120 is displaced by means of the displacement device 130 such that the metal strip returns the slot 122 of the blower back to the predetermined desired center position 128 passes through to ensure the desired uniform coating.

Gemäß einer zweiten Alternative oder ergänzend kann die Verlagerung der Abblaseinrichtung 120 auch unter Berücksichtigung der von einer Korrekturrollen-Erfassungseinrichtung 165 erfassten Anstellposition der Korrekturrolle 160 oder deren Veränderung erfolgen. Zu diesem Zweck ist der Ausgang der Korrekturrollen-Erfassungseinrichtung 165 auch auf den Eingang der Regelungseinrichtung 180 gekoppelt. Auf diese Weise würde die Verlagerung der Abblaseinrichtung im Hinblick auf eine gewünschte Maximierung der Gleichmäßigkeit bei der Beschichtung verbessert. Die Korrekturrollen-Erfassungseinrichtung 165 kann in Form von zwei Encodern ausgebildet sein, von denen jeweils einer auf jeweils einem Antrieb der Korrekturrolle 160 sitzt.According to a second alternative or in addition, the displacement of the blow-off device 120 may also take into account the setting position of the correction roller 160 or... Detected by a correction roller detection device 165 their change takes place. For this purpose, the output of the correction roller detecting means 165 is also coupled to the input of the control means 180. In this way, the displacement of the blower would be improved in view of a desired maximization of the uniformity of the coating. The correction roller detection device 165 may be designed in the form of two encoders, one of which in each case sits on a respective drive of the correction roller 160.

Die Metallband- und Korrekturrollen-Erfassungseinrichtungen 150, 165 sind ausgebildet, vorzugsweise alle denkbaren Abweichungen einer Ist-Lage des Metallbandes von der gewünschten Soll-Mittenlage zu erkennen. Dazu zählen insbesondere eine (Parallel-)Verschiebung des Metallbandes in x- oder y-Richtung oder eine Verdrehung, wie oben unter Bezugnahme auf Figur 2 erläutert. Entsprechend ist die Verlagerungseinrichtung 130 - bei geeigneter Ansteuerung durch die Regelungseinrichtung 180 - ausgebildet, die Abblaseinrichtung 120 in einer Ebene quer zur Transportrichtung R das Metallband in beliebiger Weise zu verfahren, insbesondere (parallel) zu verschieben oder zu verdrehen, um das Durchlaufen des Metallbandes in der Soll-Mittenlage zu realisieren. Die Darstellung der Verlagerungseinrichtung 130 als Kolben-Zylinder-Einheit ist insofern lediglich beispielhaft, aber nicht beschränkend.The metal strip and correction roller detection devices 150, 165 are designed to detect, preferably, all conceivable deviations of an actual position of the metal strip from the desired desired center position. These include, in particular, a (parallel) displacement of the metal strip in the x or y direction or a rotation, as described above with reference to FIG FIG. 2 explained. Correspondingly, the displacement device 130 - with suitable control by the control device 180 - is designed to move the blower 120 in a plane transverse to the transport direction R the metal strip in any way, in particular (parallel) to move or twist to the passage of the metal strip in to realize the desired center position. The representation of the displacement device 130 as a piston-cylinder unit is insofar only exemplary, but not limiting.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

100100
Vorrichtungcontraption
110110
Beschichtungsbehältercoating tank
115115
Umlenkrolleidler pulley
120120
Abblaseinrichtungblow off
122122
Schlitz der AbblaseinrichtungSlot of the blower
128128
Soll-Mittenlage des Metallbandes in der Abblaseinrichtung oder der elektromagnetischen StabilisierungseinrichtungTarget center position of the metal strip in the blower or the electromagnetic stabilization device
130130
Verlagerungseinrichtungdisplacement device
140140
elektromagnetische Stabilisierungseinrichtungelectromagnetic stabilization device
142142
Schlitz der elektromagnetischen StabilisierungseinrichtungSlot of the electromagnetic stabilizer
150150
Metallband-ErfassungseinrichtungMetal band detecting means
152152
Lagesensorposition sensor
154154
Wölbungssensorcurvature sensor
160160
Korrekturrollecorrection roller
165165
Korrekturrollen-ErfassungseinrichtungCorrection rollers detecting means
180180
Regelungseinrichtungcontrol device
190190
Steuereinrichtungcontrol device
200200
Metallbandmetal band
300300
Beschichtungsmaterialcoating material
RR
Transportrichtung des MetallbandesTransport direction of the metal strip
XX
Breitenrichtung des Metallbandes in Soll-MittenlageWidth direction of the metal strip in the desired center position
YY
Richtung quer zu der von dem Metallband aufgespannten EbeneDirection transverse to the plane spanned by the metal band
ZZ
Richtung senkrecht auf der x-y EbeneDirection perpendicular to the x-y plane

Claims (6)

  1. A method for coating a metal strip (200) with a coating material (300), wherein the method comprises:
    guiding the metal strip (200) to be coated through a coating container (110) which is filled with the liquid coating material (300), wherein the coating material adheres to the surface of the metal strip to be coated; and
    guiding the coated metal strip (200) through a slot (122) of a blowing device (120), which is downstream of the coating container (110) in the transport direction (R) of the metal strip (200), for blowing excess parts of the still liquid coating material (300) off the surface of the metal strip; detecting the actual curvature of the metal strip (200) after leaving the coating container (110); and adjusting a correction roller (160) which is arranged within the coating container (110) against the metal strip (200) for smoothing the metal strip when the amount of the actual curvature exceeds a predetermined permissible curvature threshold value, wherein the actual position of the metal strip (200) in the slot of the blowing device (120) changes due to the adjustment of the correction roller (160);
    characterized by the following steps:
    regulating the actual position of the metal strip (200) to a predetermined desired central position in the slot (122) of the blowing device (120) by displacing the blowing device in the plane transverse to the transport direction of the metal strip; the adjusted position of the correction roller (160) or the change thereof is detected by a correction roller detecting device (165); and the displacement of the blowing device (120) is carried out with consideration of the adjusted position of the correction roller (160).
  2. The method according to claim 1, characterized in that the deviation of the actual position of the metal strip (200) from its desired central position in the slot (122) of the blowing device (120) is detected;
    and
    that the displacement of the blowing device (120) is carried out according to the detected deviation.
  3. The method according to claim 1, characterized by stabilising the metal strip (200) after leaving the coating container (110) and the blowing device (120) with the aid of an electromagnetic stabilising device (140) arranged above the blowing device.
  4. Apparatus (100) for coating a metal (200) strip with a coating material (300), comprising:
    a coating container (110) with a correction roller (160), wherein the coating container (110) can be filled with the liquid coating material, for guiding the metal strip (200) therethrough, and wherein the coating material adheres to the surface of the metal strip (200) to be coated; and
    a blowing device (120) which is arranged downstream of the coating container (110) in the transport direction (R) of the metal strip, with a slot (122) for guiding the metal strip (200) therethrough and for blowing excess parts of the still liquid coating material (300) off the surface of the metal strip; a curvature sensor (154) for detecting the actual curvature of the metal strip (200) after leaving the coating container (110); and
    a control device (190) for adjusting the correction roller (160) against the metal strip (200) if the amount of the actual curvature exceeds a predetermined permissible curvature threshold value; characterized by
    a regulating device (180) for regulating the actual position of the metal strip (200) to the predetermined desired central position (128) in the slot (122) of the blowing device (122) by displacing the blowing device (120) in a plane transverse to the transport direction of the metal strip with the aid of a displacing device (130); and
    a correction roller detection device (165) for detecting the adjusted position of the correction roller (160) or the change thereof; wherein the displacement of the blowing device (120) is carried out taking into account the adjusted position of the correction roller (160).
  5. The apparatus according to claim 4, characterized in that a position sensor (152) is provided for detecting the deviation of the actual position of the metal strip (200) relative to the desired central position (128) during passage through the slot (122) of the blowing device (120) due to the adjustment of the correction roller relative to the metal strip; and that the displacement of the blowing device (120) is carried out according to the detected deviation.
  6. The device according to claim 4 or 5, characterized by an electromagnetic stabilising device (140), which is arranged above the blowing device, for stabilising the metal strip (200) after leaving the coating container (110) and the blowing device (120).
EP15777639.4A 2014-11-21 2015-09-24 Method and device for coating a metal strip Active EP3221487B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PL15777639T PL3221487T3 (en) 2014-11-21 2015-09-24 Method and device for coating a metal strip
SI201530605T SI3221487T1 (en) 2014-11-21 2015-09-24 Method and device for coating a metal strip
HRP20190156TT HRP20190156T1 (en) 2014-11-21 2019-01-23 Method and device for coating a metal strip

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102014223819 2014-11-21
DE102014225516.3A DE102014225516B3 (en) 2014-11-21 2014-12-11 Method and device for coating a metal strip
PCT/EP2015/071963 WO2016078805A1 (en) 2014-11-21 2015-09-24 Method and device for coating a metal strip

Publications (2)

Publication Number Publication Date
EP3221487A1 EP3221487A1 (en) 2017-09-27
EP3221487B1 true EP3221487B1 (en) 2018-11-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP15777639.4A Active EP3221487B1 (en) 2014-11-21 2015-09-24 Method and device for coating a metal strip

Country Status (22)

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US (1) US10190202B2 (en)
EP (1) EP3221487B1 (en)
JP (1) JP2017535679A (en)
KR (1) KR20170068578A (en)
CN (1) CN107208242B (en)
AU (1) AU2015348886B2 (en)
BR (1) BR112017008652B1 (en)
CA (1) CA2967713C (en)
DE (1) DE102014225516B3 (en)
DK (1) DK3221487T3 (en)
ES (1) ES2707976T3 (en)
HR (1) HRP20190156T1 (en)
HU (1) HUE041647T2 (en)
LT (1) LT3221487T (en)
MX (1) MX2017006592A (en)
MY (1) MY190045A (en)
PL (1) PL3221487T3 (en)
PT (1) PT3221487T (en)
RU (1) RU2662276C1 (en)
SI (1) SI3221487T1 (en)
WO (1) WO2016078805A1 (en)
ZA (1) ZA201703035B (en)

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DE102016222224A1 (en) 2016-02-23 2017-08-24 Sms Group Gmbh Method for operating a coating device for coating a metal strip and coating device
CN107876301A (en) * 2017-11-28 2018-04-06 绩溪山合机械有限公司 A kind of vibration-type chain uniform oiling device
DE102018215100A1 (en) 2018-05-28 2019-11-28 Sms Group Gmbh Vacuum coating apparatus, and method for coating a belt-shaped material
PL3643804T3 (en) * 2018-10-24 2023-08-14 John Cockerill S.A. Method for controlling a coating weight uniformity in industrial galvanizing lines
CN114150141B (en) * 2021-11-04 2023-11-17 本钢板材股份有限公司 Control method for convexity of furnace roller in overaging section

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Also Published As

Publication number Publication date
MY190045A (en) 2022-03-23
CN107208242A (en) 2017-09-26
BR112017008652B1 (en) 2021-04-13
CN107208242B (en) 2019-12-13
LT3221487T (en) 2019-02-11
CA2967713C (en) 2019-02-12
EP3221487A1 (en) 2017-09-27
AU2015348886B2 (en) 2018-10-11
BR112017008652A2 (en) 2017-12-19
WO2016078805A1 (en) 2016-05-26
AU2015348886A1 (en) 2017-06-15
SI3221487T1 (en) 2019-03-29
MX2017006592A (en) 2018-01-26
JP2017535679A (en) 2017-11-30
CA2967713A1 (en) 2016-05-26
US20170268092A1 (en) 2017-09-21
PT3221487T (en) 2019-02-25
ZA201703035B (en) 2018-05-30
ES2707976T3 (en) 2019-04-08
US10190202B2 (en) 2019-01-29
DE102014225516B3 (en) 2016-03-31
KR20170068578A (en) 2017-06-19
HRP20190156T1 (en) 2019-03-22
HUE041647T2 (en) 2019-05-28
PL3221487T3 (en) 2019-05-31
DK3221487T3 (en) 2019-03-11
RU2662276C1 (en) 2018-07-25

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