EP4210877B1 - Procédé et dispositif pour le revêtement électrostatique de bandes de métal - Google Patents

Procédé et dispositif pour le revêtement électrostatique de bandes de métal Download PDF

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Publication number
EP4210877B1
EP4210877B1 EP21777247.4A EP21777247A EP4210877B1 EP 4210877 B1 EP4210877 B1 EP 4210877B1 EP 21777247 A EP21777247 A EP 21777247A EP 4210877 B1 EP4210877 B1 EP 4210877B1
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EP
European Patent Office
Prior art keywords
nozzle
coating
metal strip
nozzle bar
gap
Prior art date
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Active
Application number
EP21777247.4A
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German (de)
English (en)
Other versions
EP4210877C0 (fr
EP4210877A1 (fr
Inventor
Felix THIEVESSEN
Jonas Müller
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.)
Speira GmbH
Original Assignee
Speira GmbH
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Publication date
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Publication of EP4210877B1 publication Critical patent/EP4210877B1/fr
Publication of EP4210877C0 publication Critical patent/EP4210877C0/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B05B5/14—Plant for applying liquids or other fluent materials to objects specially adapted for coating continuously moving elongated bodies, e.g. wires, strips, pipes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
    • B05B1/04—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape in flat form, e.g. fan-like, sheet-like
    • B05B1/044—Slits, i.e. narrow openings defined by two straight and parallel lips; Elongated outlets for producing very wide discharges, e.g. fluid curtains
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/32—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages in which a valve member forms part of the outlet opening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B05B12/084—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to condition of liquid or other fluent material already sprayed on the target, e.g. coating thickness, weight or pattern
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/24—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means incorporating means for heating the liquid or other fluent material, e.g. electrically
    • 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
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0254—Coating heads with slot-shaped outlet
    • B05C5/0262—Coating heads with slot-shaped outlet adjustable in width, i.e. having lips movable relative to each other in order to modify the slot width, e.g. to close it
    • 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
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/06—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying two different liquids or other fluent materials, or the same liquid or other fluent material twice, to the same side of the work

Definitions

  • the invention relates to a method for electrostatically coating a metal strip with a coating material using at least one nozzle bar, wherein the metal strip is moved in the longitudinal direction relative to the at least one nozzle bar, wherein the at least one nozzle bar has at least one slot nozzle with a nozzle gap, which at least partially covers the metal strip moved in the longitudinal direction in the transverse direction, an electrostatic field is generated between the at least one nozzle bar and the metal strip via a voltage source, and the metal strip is electrostatically coated at least partially with at least one coating material using the at least one nozzle bar.
  • the invention relates to a device for electrostatically coating a metal strip with a coating material, in particular with technical oils or forming aids, wherein the device has means for carrying out a relative movement of the metal strip in the longitudinal direction relative to at least one nozzle bar, the at least one nozzle bar at least partially covers the metal strip in its transverse direction and an electrostatic field is generated between the at least one nozzle bar and the metal strip via a voltage source.
  • the electrostatic coating of metal strips using at least one nozzle bar is, for example, from the US patent US 7626602 B2 known.
  • the property right deals with a device for the electrostatic coating of, for example, a metal strip with different coating materials and uses two nozzle bars for this purpose, whereby the size of the nozzle gap can be varied using handwheels.
  • Two-part nozzle bars are used, in which the two parts of the nozzle bars are arranged relative to one another in such a way that they each form a slot nozzle with a nozzle gap on which the Coating medium can escape.
  • the size of the nozzle gap is changed over the entire length of the nozzle bar using the handwheel.
  • the coating process had to be stopped, the nozzle bar removed from the device and the nozzle bar gap size measured, possibly modified and the nozzle bar reinstalled. Since forming aids and technical oils are usually applied at a relatively high temperature in order to achieve a good distribution of the spray application on the metal strip by reducing the viscosity of the application medium, the cooling was already associated with a change in the size of the nozzle gap of the slot nozzles. In particular with the technical oils and forming aids, very small gap sizes of less than 250 ⁇ m are used. The nozzle bar then had to be reinstalled, heated up and the coating process started again. One problem here is that the coating process had to be stopped.
  • the object of the present invention was to provide a method for electrostatically coating a metal strip with a coating material and a corresponding device with which the layer application to the metal strip can be adjusted with less effort and which enables the metal strip to be coated with less scrap.
  • the aforementioned object is achieved for a method for the electrostatic coating of a metal strip with a coating material in that a plurality of controllable dosing agents are used, which are arranged distributed on the at least one nozzle bar in its longitudinal direction and with which below Using a control signal, a local change in the size of the nozzle gap of the at least one nozzle bar can take place during the coating, the metering means engaging with at least one elastic element of the at least one nozzle bar in such a way that the size of the nozzle gap during the is determined by local deformation of the elastic element Coating can be changed locally, the at least one elastic element being a spring steel element.
  • controllable dosing means which are arranged in the longitudinal direction on the at least one nozzle bar, it is possible to locally change the size of the nozzle gap of the slot nozzle of the at least one nozzle bar during the coating process and thus correct the distribution of the coating material during operation.
  • a local change in the size of the nozzle gap is understood to mean that in the area of the respective dosing agent Gap size is changed, although this change does not affect the entire nozzle gap.
  • the method for electrostatically coating a metal strip is further improved in that the dosing means engage with at least one elastic element of the at least one nozzle bar in such a way that the size of the nozzle gap of the slot nozzle can be locally changed during coating by local deformation of the elastic element.
  • the elastic properties of the elastic element can generate a defined restoring moment on the dosing means, so that a precise adjustment of the size of the nozzle gap via the dosing means and thus a local enlargement or local reduction of the nozzle gap is possible.
  • the restoring moment can be adapted to the actuating forces of the dosing means.
  • the elastic element is provided as an additional elastic spring steel element.
  • the basic structure of the nozzle bar which also has, for example, means for heating and means for supplying the coating material, can be retained.
  • the nozzle bar preferably has a first and a second nozzle bar half.
  • the additional elastic element can be arranged between the two nozzle bar halves and determine the nozzle gap.
  • the distance between the dosing means on the at least one nozzle bar is a maximum of 100 mm, preferably a maximum of 50 mm.
  • the size of the dosing devices e.g. the diameter of the dosing devices, can be considered a limiting factor for the minimum distance between the dosing devices.
  • the dosing means comprise at least one piezo actuator or linear piezo actuator, with which the local change in the size of the nozzle gap takes place.
  • Piezo actuators can only carry out small adjustment movements. However, these are carried out with high precision and with high adjustment forces.
  • the high adjustment forces enable the gap size of the nozzle bar to be directly influenced.
  • the controllability of the piezo actuators means that the size of the nozzle gap and thus the distribution of the coating material can be easily adjusted during coating. This can significantly reduce waste.
  • the gap size can also be adjusted more easily, since the nozzle bar can be adjusted in the operational state at operating temperature.
  • Linear piezo actuators are particularly preferred, as their adjustment paths allow particularly precise changes in the size of the nozzle gap.
  • an aluminum alloy strip is coated on one or both sides.
  • Strips for the production of formed sheets for motor vehicles in particular from the aluminum alloys AA5XXX or AA6XXX alloy, are preferably coated with a coating material, in particular technical protective oils or forming aids.
  • the strips have a preferred thickness of 0.5 mm to 4 mm.
  • Corresponding aluminum strips are preferably subjected to further forming steps for use in motor vehicles, for example deep drawing, flanging, bending, etc., in which the technical protective oils and forming aids significantly improve the forming properties of the strip or sheet and reduce waste.
  • protective oils, lubricants, forming lubricants with temperature-dependent viscosity or hot melts are preferably applied to the metal strip as coating materials.
  • Protective oils are primarily used to protect against corrosion but also to protect against mechanical damage to the strips or sheets made from them.
  • Forming lubricants are intended to improve the forming behavior of the sheets produced from the strip during forming, with forming lubricants with temperature-dependent viscosity preferably being applied to the metal strip. These can easily be electrostatically sprayed onto the metal strip at elevated temperatures and adhere well to this metal strip due to the change in viscosity when they hit the cooler metal strip.
  • Such forming aids are particularly important for the forming of sheets made from aluminum alloy strips, since the forming properties of higher-strength variants are limited, for example, and this makes forming significantly easier.
  • hot melts can, for example, be processed better according to the next embodiment of the method in that the at least one nozzle bar is heated at least during the coating of the metal strip.
  • the increased temperature of the nozzle bar influences the viscosity of the coating material so that it can be applied with improved precision.
  • the locally adjustable size of the nozzle gap during coating also means that the nozzle bar no longer has to be cooled down in order to change the size of the nozzle gap. As a result, a corrected spray application of the coating material can be achieved much more easily with a heated nozzle bar.
  • the thickness of the layer of coating material is measured after coating during the ongoing coating process and the dosing agents are selected based on the measured distribution of the amount of coating material on the metal strip surface set, controlled or regulated. Due to the only local change in the size of the nozzle gap of the slot nozzle, the production of rejects during operation can be further reduced by controlling the dosing agents. A faulty coating can be corrected without stopping the process or manually intervening.
  • the above-mentioned object is also achieved by a device for electrostatically coating a metal strip with a coating material, in particular technical oils or forming aids, in that a plurality of controllable dosing means are provided, which are arranged distributed on the at least one nozzle bar in its longitudinal direction, wherein the controllable dosing means are designed in such a way that they can carry out a local change in the size of the nozzle gap of the nozzle bar when controlled using a control signal, wherein the at least one nozzle bar has at least one elastic element for forming the at least one nozzle gap and the controllable dosing means are in engagement with the at least one elastic element in such a way that the size of the nozzle gap can be changed locally, wherein the at least one elastic element is a spring steel element.
  • a change in the local size of the nozzle gap means an enlargement or reduction of the nozzle gap of the slot nozzle, whereby this essentially only has an effect in the area of a dosing means, analogous to the effect of an adjusting screw.
  • the opening width of the nozzle gap of the slot nozzle of the nozzle bar depends on the respective medium.
  • a nozzle gap with a width of 200 ⁇ m to 70 ⁇ m, preferably 170 ⁇ m to 70 ⁇ m has proven to be advantageous.
  • controllable dosing means which can locally cause a change in the size of the nozzle gap of the nozzle bar
  • the coating of the device for electrostatically coating a metal strip can be corrected during operation of the device, so that errors and scrap production are reduced.
  • the coating can be adjusted much better, namely during operation.
  • a nozzle bar consisting of just two parts can also be used.
  • the at least one nozzle bar has at least one elastic element for forming the at least one nozzle gap, the controllable metering means engaging with the at least one elastic element in such a way that the size of the nozzle gap can be changed locally.
  • a restoring force can be automatically provided via an elastic element, with which the size of the nozzle gap can be varied precisely and with repeatability.
  • the nozzle bar has at least one additional elastic element according to the invention, the nozzle bar can be easily adapted to the dosing agent used.
  • the elastic element then preferably extends at least over the length of the nozzle bar that is intended for coating the metal strip.
  • the elastic element is a spring steel element.
  • the spring steel element can provide the elastic properties with high precision and repeatability.
  • spring steel can also provide chemical stability with respect to the coating materials used.
  • the distance between the controllable dosing means in the longitudinal direction of the nozzle bar is preferably a maximum of 100 mm, preferably a maximum of 50 mm. The smaller the distance, the more precise the gap size can be adjusted. However, as the number of controllable dosing means increases, the effort required for control and the costs for provision increase.
  • controllable dosing means comprise at least one piezo actuator, or preferably at least one linear piezo actuator, robust actuators can be provided which can carry out a precise local change of the nozzle gap with large actuating forces.
  • an isolated transmission member is preferably provided for each dosing agent, which locally transfers the size of the nozzle gap to be set by the dosing agent to the nozzle bar. This means that the dosing agent can be safely protected from the electrical voltage present on the nozzle bar.
  • An insulated sliding cylinder with a push rod can preferably be provided as the transmission member.
  • the sliding cylinder is preferably made of polyamide, which has a high breakdown voltage per layer thickness. This means that the dosing agent, preferably a piezo actuator, is reliably protected against the electrostatic voltage.
  • means for determining the thickness of the layer of coating material in particular technical oils or forming aids, are provided on the metal strip after coating in the ongoing coating process, with which the controllable dosing means can be controlled in groups or separately, there is the possibility Operation of the device to be able to react to defective coatings as early as possible and to keep waste as low as possible.
  • metal strips coated with forming aids according to the invention in particular aluminum or aluminum alloy strips, in subsequent forming processes, for example for producing formed sheets for a motor vehicle, since the coating quality can be increased with forming aids, for example, and the forming process thus produces less waste.
  • a device for coating a metal strip 1 with a coating material 2 using at least one nozzle bar 3 is shown.
  • the exemplary embodiment of the device shows two nozzle bars 3 arranged opposite each other, which are arranged on both sides of the metal strip 1 in order to coat it on both sides.
  • only a one-sided or non-symmetrical arrangement of nozzle bars 3 is also conceivable.
  • the metal strip 1 is moved in the longitudinal direction relative to the nozzle bar 3, the at least one nozzle bar 3 having at least one slot nozzle with a nozzle gap, which at least partially covers the metal strip moving in the longitudinal direction in the transverse direction.
  • the metal strip 1 is coated on both sides at least partially with at least one coating material 2 in the present exemplary embodiment.
  • a voltage source 4 creates an electrostatic field between the nozzle bar 3 and the one here Belt rollers grounded metal belt 1 is generated.
  • the grounded strip rollers R are used to ground the metal strip.
  • Technical oils or forming aids, in particular forming lubricants, for example with temperature-dependent viscosity, for example so-called hot melts are preferably used as coating materials.
  • the technical oils for example protective oils, which protect against corrosion, for example, or the forming lubricants mentioned are applied to the metal strip using the electrostatic field.
  • the nozzle bars 3 are usually heated to a specific temperature in order to reduce the viscosity of the coating materials.
  • the nozzle bars in Fig.1 not shown, controllable dosing means, which are distributed in the longitudinal direction of the at least one nozzle bar 3 and locally change the size of the nozzle gap of the nozzle bar 3.
  • a means M for determining the thickness of the layer of coating material on the metal strip 1 after coating in the ongoing coating process is shown.
  • the dosing means of the nozzle bar 3 (not shown) can be adjusted, controlled or regulated in order to react to errors in the coating during the ongoing coating process.
  • Fig. 2 is a schematic top view of an arrangement of a nozzle bar 3, the nozzle gap of which completely covers the metal strip 1. Furthermore, it is conceivable to use a different arrangement of, for example, two nozzle bars 3, which only partially cover the metal strip 2. Both conceivable arrangements of nozzle bars 3 can be arranged on one or both sides of the metal strip 1.
  • FIG. 3 A nozzle bar 3 with a dosing agent 5 is now shown in a perspective view.
  • the two nozzle bar halves 3B and 3C form a nozzle gap 3A of a slot nozzle.
  • the nozzle gap 3A extends in the longitudinal direction of the nozzle bar 3 and has a size. Due to manufacturing tolerances, the size of the nozzle gap 3A can vary depending on the position in the longitudinal direction of the nozzle bar 3.
  • Fig. 3 now only a controllable dosing agent 5 is shown.
  • the holes provided in the nozzle bar 3 for connecting further dosing agents 5 show that the dosing agents 5 are distributed on the at least one nozzle bar 3 in the longitudinal direction, for example distributed at equal intervals.
  • the two nozzle bar halves 3B and 3C are mechanically connected to one another, for example screwed, at the end opposite the nozzle gap 3A, so that the nozzle gap 3A can be varied via metering agent 5.
  • the restoring force for setting a nozzle gap against the metering agent 5 is provided by the screw connection of the nozzle bar halves 3B and 3C and their elastic properties.
  • the width of the nozzle gap 3A is preferably 200 ⁇ m to 70 ⁇ m, preferably 170 ⁇ m to 70 ⁇ m and can vary in the longitudinal direction of the nozzle bar.
  • Fig. 4 the entire nozzle bar 3 with controllable dosing means 5 is shown in a perspective view.
  • the size of the nozzle gap 3A can be adjusted locally over the entire nozzle bar 3 via the metering means 5. This allows the nozzle gap 3A to be adjusted to very small spatial distances during coating, so that the amount of locally applied coating material 2 can be changed during the ongoing process. This allows defective coatings to be corrected during operation and scrap to be reduced.
  • Fig. 5 shows this in a sectional view Fig. 4 known embodiment, in which the dosing means 5 have a piezo actuator, in particular a linear piezo actuator 6, which can influence the size of the nozzle gap 3A via a transmission member, here in the form of an insulated sliding cylinder 7 with pressure rods 8.
  • Piezo actuators 6 can only perform very small deflections, however, have high actuating forces, which are able to locally bring about a corresponding change in the size of the nozzle gap 3A.
  • means for tempering the nozzle bar 3 are provided in the nozzle bar 3, with which the nozzle bar 3 is heated, for example using a tempering liquid.
  • the screw connection of the two nozzle bar halves 3B and 3C can be seen via the screw 10.
  • the Fig.5 In contrast to a 2-part nozzle bar, the Fig.5 In the embodiment shown, an elastic element 11 is present between the nozzle beam halves 3B and 3C, onto which the pressure rods 8 of the dosing means 5 exert pressure and which is in engagement with the latter in such a way that the size of the nozzle gap 3A can be locally changed during coating by the local deformation of the elastic element 11.
  • the enlarged section from Fig.5 clearly shows the elastic element 11, on which pressure can be exerted via the sliding cylinder 7 with the pressure rod 8 for elastic deformation.
  • the distance between the dosing means 5 on the nozzle bar can be a maximum of 100 mm, but also a maximum of 50 mm, so that a large number of dosing means 5 are arranged on the nozzle bar 3.
  • the elastic element 11 is a spring steel element that can be precisely selected or constructed in relation to the actuating forces provided, for example by the piezo actuators. As a spring steel element, it can provide the necessary elastic properties over a long period of time with high consistency.
  • the sliding cylinder 7 shown is preferably made of polyamide, which has a high breakdown voltage per layer thickness. This ensures that, despite the high voltage on the nozzle bar, the dosing means 5 are sufficiently decoupled from the electrical high voltage and can be controlled without any problems.
  • other materials from which the sliding cylinders can be made are also conceivable.
  • Aluminum alloy strips which are used for the production of formed sheets for motor vehicles, are preferably coated with the method according to the invention and the device according to the invention.
  • Corresponding sheets must have a coating of technical oils, protective oils or forming aids, such as forming lubricants, in order to have a predetermined forming behavior during forming. Due to the size of the nozzle gap 3A of the slot nozzle of the nozzle bar 3, which can be changed locally during operation, the layer application of coating material 2 can be corrected during operation in the event of an error. As a result, sheets made from appropriately coated strips also produce less waste in downstream forming processes, for example in the production of formed sheets for motor vehicles. This applies in particular to aluminum alloy strips, which are typically used in motor vehicles, because they are often formed with maximum degrees of deformation for the material.

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  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Claims (13)

  1. Procédé de revêtement électrostatique d'une bande métallique (1) avec un matériau de revêtement (2) en utilisant au moins une barre de buses (3), la bande métallique (1) étant déplacée dans la direction longitudinale par rapport à la au moins une barre de buses (3), la au moins une barre de buses (3) présentant au moins une buse à fente avec une fente de buse (3A), qui recouvre au moins partiellement la bande métallique (1) déplacée dans la direction longitudinale dans la direction transversale, un champ électrostatique est généré entre la au moins une barre de buses (3) et la bande métallique (1) par l'intermédiaire d'une source de tension (4) et la bande métallique (1) est revêtue électrostatiquement au moins sur une partie de sa surface avec au moins un matériau de revêtement (2) en utilisant la au moins une barre de buses (3),
    caractérisé en ce qu'
    on utilise une pluralité de moyens de dosage (5) pouvant être commandés, qui sont disposés sur la au moins une barre de buses (3) en étant répartis dans sa direction longitudinale et avec lesquels, en utilisant un signal de commande, on peut effectuer une modification locale de la taille de la fente de buse (3A) de la au moins une barre de buses (3) pendant le revêtement, les moyens de dosage (5) étant en prise avec au moins un élément élastique (11) de la au moins une barre de buses (3) de telle sorte que, par déformation locale de l'élément élastique (11), la taille de la fente de buse (3A) peut être modifiée localement pendant le revêtement, le au moins un élément élastique (11) étant un élément en acier à ressort.
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    les moyens de dosage (5) comprennent au moins un actionneur piézoélectrique ou un actionneur piézoélectrique linéaire (6) avec lesquels la modification locale de la taille de la fente de la buse (3A) est effectuée pendant le revêtement.
  3. Procédé selon la revendication 1 ou 2,
    caractérisé en ce qu'
    une bande d'alliage d'aluminium (1) est revêtue sur une ou sur les deux faces.
  4. Procédé selon l'une des revendications 1 à 3,
    caractérisé en ce que
    des huiles de protection, des lubrifiants, des auxiliaires de formage tels qu'un lubrifiant de formage ou des lubrifiants de formage dont la viscosité dépend de la température sont appliqués sur la bande métallique (1) en tant que matériau de revêtement (2).
  5. Procédé selon l'une des revendications 1 à 4,
    caractérisé en ce que
    ladite au moins une barre de buses (3) est chauffée au moins pendant le revêtement de la bande métallique (1).
  6. Procédé selon l'une des revendications 1 à 5,
    caractérisé en ce que
    l'épaisseur de la couche du matériau de revêtement (2) sur la bande métallique (1) est mesurée pendant le processus de revêtement en cours et les moyens de dosage (5) sont réglés, commandés ou régulés en groupes ou individuellement à l'aide de la répartition mesurée de la quantité du matériau de revêtement (2) sur la surface de la bande métallique.
  7. Dispositif de revêtement électrostatique d'une bande métallique (1) avec un matériau de revêtement (2), en particulier avec des huiles techniques ou des auxiliaires de formage, en particulier pour la mise en oeuvre d'un procédé selon l'une des revendications 1 à 6, le dispositif présentant des moyens pour effectuer un mouvement relatif de la bande métallique (1) dans la direction longitudinale par rapport à au moins une barre de buses (3) du dispositif, l'au moins une barre de buses (3) présentant au moins une buse à fente avec une fente de buse (3A) qui recouvre au moins partiellement la bande métallique (1) déplacée dans la direction longitudinale dans la direction transversale et une source de tension (4) étant prévue, avec laquelle un champ électrostatique est généré entre l'au moins une barre de buses (3) et la bande métallique (1),
    caractérisé en ce qu'
    il est prévu une pluralité de moyens de dosage (5) pouvant être commandés, qui sont disposés sur la au moins une barre de buses (3) en étant répartis dans sa direction longitudinale, les moyens de dosage (5) pouvant être commandés étant conçus de telle sorte que ceux-ci peuvent, lors de la commande, effectuer une modification locale de la taille de la fente de buse (3A) de la barre de buses (3) en utilisant un signal de commande, l'au moins une rampe de buses (3) présentant au moins un élément élastique (11) pour former l'au moins une fente de buse (3A) et les moyens de dosage (5) pouvant être commandés étant en prise avec l'au moins un élément élastique (11) de telle sorte que la taille de la fente de buse (3A) peut être modifiée localement, l'au moins un élément élastique (11) étant un élément en acier à ressort.
  8. Dispositif selon la revendication 7,
    caractérisé en ce que
    la distance entre les moyens de dosage commandables (5) disposés sur la barre de buses (3) est de 100 mm au maximum, de préférence de 50 mm au maximum, dans la direction longitudinale de ladite au moins une barre de buses (3).
  9. Dispositif selon la revendication 7 ou 8,
    caractérisé en ce que
    les moyens de dosage commandables (5) comprennent au moins un actionneur piézoélectrique avec lequel une modification locale de la taille de la fente de la buse (3A) peut être effectuée pendant le revêtement.
  10. Dispositif selon l'une des revendications 7 à 9,
    caractérisé en ce qu'il est
    prévu, pour chaque moyen de dosage (5), un élément de transmission isolé (7, 8) qui transmet localement à la barre de buses (3) la taille de la fente de buse (3A) à régler par le moyen de dosage (5).
  11. Dispositif selon l'une des revendications 7 à 10,
    caractérisé en ce qu'il
    est prévu comme organe de transmission isolé un cylindre coulissant isolé (7) avec au moins une tige de pression (8), par l'intermédiaire duquel le moyen de dosage (5) est en prise avec la fente de buse (3A).
  12. Dispositif selon l'une quelconque des revendications 7 à 11,
    caractérisé en ce que
    des moyens (M) sont prévus pour déterminer l'épaisseur de la couche de matériau de revêtement (2) sur la bande métallique (1) après le revêtement dans le processus de revêtement en cours, avec lesquels les moyens de dosage (5) peuvent être commandés en groupes ou individuellement en utilisant une unité de commande.
  13. Procédé de fabrication de tôles mises en forme pour un véhicule automobile, ledit procédé comprenant :
    - revêtement de bandes métalliques, en particulier de bandes en alliage d'aluminium, avec des auxiliaires de formage, avec un procédé selon les revendications 1 à 6, et
    - utilisation des bandes métalliques revêtues, en particulier des bandes en alliage d'aluminium, dans un processus de formage ultérieur pour la fabrication de tôles formées pour un véhicule automobile.
EP21777247.4A 2020-09-11 2021-09-09 Procédé et dispositif pour le revêtement électrostatique de bandes de métal Active EP4210877B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020123740.5A DE102020123740A1 (de) 2020-09-11 2020-09-11 Verfahren und Vorrichtung zur elektrostatischen Beschichtung von Metallbändern
PCT/EP2021/074819 WO2022053559A1 (fr) 2020-09-11 2021-09-09 Procédé et dispositif de revêtement électrostatique de bandes métalliques

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EP4210877B1 true EP4210877B1 (fr) 2024-04-03
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Publication number Priority date Publication date Assignee Title
EP4268970A1 (fr) * 2022-04-29 2023-11-01 Speira GmbH Dispositif de prélaquage en continu et procédé de production d'une couche de conversion et/ou de passivation sur au moins une surface d'une bande métallique
CN116273630B (zh) * 2023-02-15 2024-02-27 广东宝冠板材科技有限公司 一种彩涂板材生产线

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984001524A1 (fr) * 1982-10-21 1984-04-26 Sale Tilney Technology Plc Lames de revetement electrostatique, appareils comprenant de telles lames et procedes utilisant de telles lames
US5464577A (en) 1994-01-04 1995-11-07 Minnesota Mining And Manufacturing Company Method of thickness control for dies
DE10129250A1 (de) * 2000-12-16 2002-06-20 Klaschka Gmbh & Co Flüssigkeitsdüse zum breitflächigen Aufbringen einer Flüssigkeitsschicht auf eine Werkstückoberfläche sowie Verfahren zum Betreiben einer solchen
DE10119633A1 (de) * 2001-04-20 2002-10-24 Nordson Corp Vorrichtung und Verfahren zum Abgeben von Fluid auf ein relativ zu der Vorrichtung bewegbares Substrat
DE10249080A1 (de) * 2002-10-21 2004-04-29 Nordson Corp., Westlake Verfahren und Vorrichtung zum Auftragen von fließfähigen Materialen auf Substrate
BRPI0410932B1 (pt) * 2003-06-03 2014-02-11 Conjunto de matriz e método
US7626602B2 (en) 2006-09-15 2009-12-01 Mcshane Robert J Apparatus for electrostatic coating
DE102011001140A1 (de) 2011-03-08 2012-09-13 Thyssenkrupp Steel Europe Ag Stahlflachprodukt, Verfahren zum Herstellen eines Stahlflachprodukts und Verfahren zum Herstellen eines Bauteils
ES2459307T3 (es) 2011-09-15 2014-05-08 Hydro Aluminium Rolled Products Gmbh Procedimiento de producción para banda de aluminio de AlMgSi
DE102015119818A1 (de) * 2015-11-17 2017-05-18 V.I.E. Systems GmbH Vorhangdüse zum beschichten eines substrats mit variabler spaltbreite

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EP4210877C0 (fr) 2024-04-03
DE102020123740A1 (de) 2022-03-17
EP4210877A1 (fr) 2023-07-19

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