EP0186564A1 - Process and apparatus for controlling and regulating the coating thickness of supports - Google Patents

Process and apparatus for controlling and regulating the coating thickness of supports Download PDF

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Publication number
EP0186564A1
EP0186564A1 EP85402417A EP85402417A EP0186564A1 EP 0186564 A1 EP0186564 A1 EP 0186564A1 EP 85402417 A EP85402417 A EP 85402417A EP 85402417 A EP85402417 A EP 85402417A EP 0186564 A1 EP0186564 A1 EP 0186564A1
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European Patent Office
Prior art keywords
thickness
coating
sensors
strip
blowing
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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.)
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EP85402417A
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German (de)
French (fr)
Inventor
Robert Wang
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Fives Stein SA
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Stein Heurtey SA
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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
    • C23C2/14—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
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/24—Removing excess of molten coatings; Controlling or regulating the coating thickness using magnetic or electric fields

Definitions

  • the present invention relates to the control and regulation of the thickness of a thin metallic coating deposited on a conductive support, in particular a continuously moving strip.
  • the present invention relates more particularly to a particular application of the method and of the device for measuring the thickness of thin metallic layers, deposited on a conductive support, described in French patent n ° 84 16 290, filed on October 24, 1984 by the present holder.
  • This French patent describes a thickness measurement process, characterized in that this thickness is determined from the measurement of the losses corresponding to the Joule effect, due to the eddy currents, which appear when approaching the metal surface. a magnetic circuit which is excited by an alternating voltage. This patent also describes a sensor for the implementation of this method.
  • the coating thickness is checked at a point which is far from the place where the deposit itself is done.
  • Such thickness control is carried out using known means, such as, for example, coating gauges by back-scattering of ionizing radiation.
  • the information delivered by these control means is used to correct the operation of the means which act on the thickness of the still liquid coating, in the immediate vicinity of the place where the deposit is made.
  • devices commonly known under the name of pneumatic wiping systems are used, an exemplary embodiment of which has been shown diagrammatically, in vertical section, in FIG. 1 of the accompanying drawings.
  • a regulation loop can be arranged between the coating thickness measurement system and the device for blowing the 1 gas core in order to adjust the action of this device on the strip 14, as a function of the coating thickness noted.
  • Such a regulation loop exists in many installations, however, given the distance which exists between the measurement point and the point where the correction action takes place, there is a delay in the regulation action, and significant losses of product, otherwise of good quality, are observed during the periods during which the operation of the installation is not in steady state (variations in speed, voluntary change in the thickness of the coating, etc. ).
  • the time required for a change in coating thickness to be recorded by the measurement system is one and a half minutes, and for the time to obtain a new equilibrium of the order of 2 to 3 minutes, which represents a total of disturbed operation of the order of 3.5 minutes to 4.5 minutes, resulting in a loss of band which is between 210 and 270 meters.
  • the present invention proposes to eliminate the drawbacks encountered in the conventional installations mentioned above.
  • the subject of the present invention is therefore, firstly, a process for controlling and regulating the thickness of a thin metallic coating deposited on a conductive support, characterized in that it consists in continuously and simultaneously receiving the information relating to the thickness of the coating produced on the support, for example a continuously moving metal strip, at several points thereof, and to transmit this information to associated regulation means, covering the same area of the strip, in order to adjust the action of said regulating means on the strip as a function of the thickness of the coating observed.
  • each sensor or group of sensors for measuring the thickness of the coating is associated with a means designed so as to modify the blowing conditions affecting the zone of the strip concerned by this sensor or group of sensors. This can be achieved using an analog, digital, etc. control loop.
  • blowing nozzles which can be used in the device for controlling and regulating the thickness of the coating specified above.
  • the device according to the present invention comprises sensors for measuring the thickness of the coating deposited on the strip 14.
  • These sensors 26, 26 '(or groups of sensors) are preferably of the type described in French patent n ° 84 16 290.
  • Each sensor or group of sensors is fixed to the blowing system constituted by the nozzles 18, 18 ', similar to the nozzles described above with reference to Figure 1
  • the sensors therefore continuously supply information relating to the profile of the coating obtained by the blowing the thin gas blade through the slots 24, 24 'of the blowing nozzles 18, 18'. As specified above, there is no delay between the time when the coating is formed and the time when the information relating to the coating is provided by the measurement sensors 26, 26 '.
  • the blowing nozzles 18, 18 ′ are produced so as to make it possible to locally modify the blowing conditions on the strip and thus to act on the residual thickness of the layer of liquid metal, ie ie on the thickness of the thin metallic coating deposited on the strip 14.
  • Figures 3 and 4 show examples of the realization of nozzles that can be used in the device illustrated in Figure 2.
  • the blowing nozzle is provided, upstream of the gas ejection slot 24, with one or more leak openings 28, making it possible to locally reduce the flow rate passing through the slot 24, without changing the direction, but by changing the local spin conditions.
  • This leakage rate is regulated by means of valves, such as 30, placed on a relief pipe and actuated by means of a regulation loop which receives information from the signal of one or several of the thickness measurement sensors 26, 26 ′, placed above the blowing nozzle.
  • a deformable blowing nozzle is used, which makes it possible to modify the thickness of the thin blade of gas blown through the slot 24.
  • the nozzle comprises a fixed element 36 and a mobile element 36 'which is mounted on the fixed element by means of a deformable blade 32.
  • a control member such as a screw 34 or a jack, is used to deform the the nozzle.
  • a local modification of the blowing conditions is thus obtained, thanks to the action of the screw 34 on the deformable element 36 'of the nozzle, which makes it possible to vary the width of the blowing slot under the effect of the action of the regulation circuit receiving the information delivered by the group or groups of sensors for measuring the thickness of the coating associated with the nozzles and their deformation control systems (screws 34, cylinder or the like).
  • the method and the device which are the subject of the present invention apply more particularly to galvanization.
  • the invention is not limited to this application, nor is it limited to regulating the liquid coating by pneumatic spinning.
  • thickness detection techniques in which we introduce the possibility of local action on the thickness of the coatings, by playing on one or more parameters governing the deposition process.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating With Molten Metal (AREA)
  • Coating Apparatus (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

Process for controlling and regulating the thickness of a metal coating deposited on a support, especially on a tape, consisting in continuously and simultaneously receiving the data relating to the thickness of the coating produced on the support at a number of points thereof and in transmitting the said data to associated thickness-regulating means. <IMAGE>

Description

La présente invention concerne le contrôle et la régulation de l'épaisseur d'un revêtement métallique mincé déposé sur un support conducteur, notamment une bande en déplacement continu.The present invention relates to the control and regulation of the thickness of a thin metallic coating deposited on a conductive support, in particular a continuously moving strip.

La présente invention concerne plus particulièrement une application particulière du procédé et du dispositif de mesure de l'épaisseur de couches métalliques minces, déposées sur un support conducteur, décrits dans le brevet français n° 84 16 290, déposé le 24 octobre 1984 par la présente titulaire.The present invention relates more particularly to a particular application of the method and of the device for measuring the thickness of thin metallic layers, deposited on a conductive support, described in French patent n ° 84 16 290, filed on October 24, 1984 by the present holder.

Ce brevet français décrit un procédé de mesure d'épaisseur, caractérisé en ce que cette épaisseur est déterminée à partir de la mesure des pertes correspondant à l'effet Joule, dû aux courants de Foucault, qui apparaissent lorsqu'on approche de la surface métallique un circuit magnétique qui est excité par une tension alternative. Ce brevet décrit également un capteur pour la mise en oeuvre de ce procédé.This French patent describes a thickness measurement process, characterized in that this thickness is determined from the measurement of the losses corresponding to the Joule effect, due to the eddy currents, which appear when approaching the metal surface. a magnetic circuit which is excited by an alternating voltage. This patent also describes a sensor for the implementation of this method.

Dans les installations de revêtements métalliques au trempé, comme, par exemple, des lignes de galvanisation de bandes métalliques en continu, le contrôle de l'épaisseur du revêtement s'effectue en un point qui est éloigné de l'endroit où le dépôt proprement dit est effectué. Un tel contrôle d'épaisseur est réalisé à l'aide de moyens connus, tels que, par exemple, des jauges de revêtement par rétro-diffusion du rayonnement ionisant. On utilise l'information délivrée par ces moyens de contrôle pour corriger le fonctionnement des moyens qui agissent sur l'épaisseur du revêtement encore liquide, au voisinage immédiat de l'endroit où est effectué le dépôt. A cet effet, on utilise couramment des dispositifs connus sous le nom de systèmes d'essorage pneumatique et dont un exemple de réalisation a été représenté schématiquement, en coupe verticale, sur la Figure 1 des dessins annexés. Ces systèmes consistent à mettre en oeuvre une mince lame de gaz qui exerce, à l'emplacement de son impact sur la bande fraîchement revêtue du dépôt liquide, une pression qui refoule l'excès de métal de revêtement vers le bain dans lequel 74a bande est trempée. Sur cette Figure 1, on voit, en 10, le bain de revêtement qui atteint le niveau 12 et qui est traversé par la bande 14 circulant en continu. Cette bande entraîne une couche d'excès de métal 16. Pour refouler cette couche 16 dans le bain, des buses de soufflage 18, 18', comportant des fentes d'insufflation 24, 24', émettent une mince lame de gaz, de part et d'autre de la bande. Les buses sont alimentées en gaz à l'aide de conduits 20, 20', qui sont munis de vannes de réglage, telles que 22. Pour modifier l'épaisseur résiduelle du revêtement sur la bande 14, on agit soit sur la pression du gaz soufflé au travers des fentes 24, 24', soit sur la distance entre les buses de soufflage 18, 18' et la bande 14, soit encore sur la combinaison de ces deux réglages.In dipping metal coating installations, such as, for example, galvanizing lines for continuous metal strips, the coating thickness is checked at a point which is far from the place where the deposit itself is done. Such thickness control is carried out using known means, such as, for example, coating gauges by back-scattering of ionizing radiation. The information delivered by these control means is used to correct the operation of the means which act on the thickness of the still liquid coating, in the immediate vicinity of the place where the deposit is made. To this end, devices commonly known under the name of pneumatic wiping systems are used, an exemplary embodiment of which has been shown diagrammatically, in vertical section, in FIG. 1 of the accompanying drawings. These systems consist in using a thin strip of gas which exerts, at the site of its impact on the strip freshly coated with the liquid deposit, a pressure which pushes the excess of coating metal towards the bath in which the strip is soaked. In this Figure 1, we see, at 10, the coating bath which reaches level 12 and which is crossed by the strip 14 circulating continuously. This strip entrains an excess layer of metal 16. To discharge this layer 16 into the bath, blowing nozzles 18, 18 ′, comprising insufflation slots 24, 24 ′, emit a thin strip of gas, from and other of the band. The nozzles are supplied with gas by means of conduits 20, 20 ′, which are provided with adjustment valves, such as 22. To modify the residual thickness of the coating on the strip 14, one acts either on the pressure of the gas blown through the slots 24, 24 ′, either over the distance between the blowing nozzles 18, 18 ′ and the strip 14, or over the combination of these two settings.

On peut aménager une boucle de régulation entre le système de mesure de l'épaisseur de revêtement et le dispositif de soufflage de la 1ame· de gaz en vue d'ajuster l'action de ce dispositif sur la bande 14, en fonction de l'épaisseur de revêtement constatée. Une telle boucle de régulation existe dans de nombreuses installations, cependant, étant donné la distance qui existe entre le point de mesure et le point où s'effectue l'action de correction, il existe un retard dans l'action de la régulation, et l'on observe des pertes importantes de produit, par ailleurs de bonne qualité, durant les périodes pendant lesquelles le fonctionnement de l'installation n'est pas en régime stabilisé (variations de vitesse, changement volontaire de l'épaisseur du revêtement, etc.).A regulation loop can be arranged between the coating thickness measurement system and the device for blowing the 1 gas core in order to adjust the action of this device on the strip 14, as a function of the coating thickness noted. Such a regulation loop exists in many installations, however, given the distance which exists between the measurement point and the point where the correction action takes place, there is a delay in the regulation action, and significant losses of product, otherwise of good quality, are observed during the periods during which the operation of the installation is not in steady state (variations in speed, voluntary change in the thickness of the coating, etc. ).

A titre d'exemple, on peut mentionner que, pour une jauge de revêtement positionnée à 90 mètres du bain de revêtement, sur une ligne fonctionnant à. une vitesse de 60 m/mn, le temps nécessaire pour qu'un changement de l'épaisseur de revêtement survenu soit enregistré par le système de mesure est de une minute et demi, et que le temps d'obtention d'un nouvel équilibre est de l'ordre de 2 à 3 minutes, ce qui représente au total un temps de fonctionnement perturbé de l'ordre de 3,5 minutes à 4,5 minutes, se traduisant par une perte de bande qui est comprise entre 210 et 270 mètres. On peut remédier partiellement à cet inconvénient des systèmes classiques, en introduisant une modélisation mathématique du fonctionnement du système de soufflage de la mince lame de gaz, qui réduit la perte de bande détériorée. Cependant, dans toutes ces applications,, il est impossible d'agir de façon automatique et efficace sur le profil transversal du revêtement réalisé sur chaque face de la bande. Ce profil peut varier en fonction de nombreux paramètres, contrôlables ou non, de fonctionnement de l'installation, et notamment lorsque la planéité de la bande, ou ses déformations, sont modifiées. On utilise, dans ce but, des dispositifs mécaniques de redressement de la planéité de la bande, mais leur efficacité s'est révélée aléatoire pour des tôles de qualité médiocre.By way of example, it may be mentioned that, for a coating gauge positioned 90 meters from the coating bath, on a line operating at. at a speed of 60 m / min, the time required for a change in coating thickness to be recorded by the measurement system is one and a half minutes, and for the time to obtain a new equilibrium of the order of 2 to 3 minutes, which represents a total of disturbed operation of the order of 3.5 minutes to 4.5 minutes, resulting in a loss of band which is between 210 and 270 meters. One can partially remedy this drawback of conventional systems, by introducing a mathematical modeling of the operation of the blowing system of the thin gas blade, which reduces the loss of deteriorated tape. However, in all these applications, it is impossible to act automatically and effectively on the transverse profile of the coating produced on each face of the strip. This profile can vary depending on many parameters, controllable or not, of the operation of the installation, and in particular when the flatness of the strip, or its deformations, are modified. For this purpose, mechanical devices are used to straighten the flatness of the strip, but their effectiveness has proved to be uncertain for sheets of poor quality.

La présente invention se propose d'éliminer les inconvénients rencontrés dans les installations classiques mentionnées ci-dessus.The present invention proposes to eliminate the drawbacks encountered in the conventional installations mentioned above.

La présente invention a donc pour objet, en premier lieu, un procédé pour le contrôle et la régulation de l'épaisseur d'un revêtement métallique mince déposé sur un support conducteur, caractérisé en ce qu'il consiste à recevoir en continu et simultanément les informations relatives à l'épaisseur du revêtement réalisé sur le support, par exemple une bande métallique en déplacement continu, en plusieurs points de celui-ci, et à transmettre ces informations à des moyens de régulation associés, couvrant la même zone de la bande, afin d'ajuster l'action desdits moyens de régulation sur la bande en fonction de l'épaisseur du revêtement constatée.The subject of the present invention is therefore, firstly, a process for controlling and regulating the thickness of a thin metallic coating deposited on a conductive support, characterized in that it consists in continuously and simultaneously receiving the information relating to the thickness of the coating produced on the support, for example a continuously moving metal strip, at several points thereof, and to transmit this information to associated regulation means, covering the same area of the strip, in order to adjust the action of said regulating means on the strip as a function of the thickness of the coating observed.

La présente invention vise, en second lieu, un dispositif pour la mise en oeuvre de ce procédé. Ce dispositif met en oeuvre :

  • - d'une part, un capteur, ou un groupe de capteurs de mesure de l'épaisseur de revêtement, du type décrit dans le brevet français mentionné ci-dessus, ledit groupe de capteurs, fixé sur le dispositif de soufflage décrit ci-dessus en référence à la Figure 1, fournissant en permanence les informations relatives au profil du revêtement réalise par ce dispositif de soufflage, ce qui permet d'éviter tout retard entre l'instant où le revêtement est formé et l'instant où l'information sur ce revêtement est fournie par le moyen de mesure ; et,
  • - d'autre part, des buses de soufflage permettant de modifier localement les conditions de soufflage sur la bande, afin d.'agir sur l'épaisseur résiduelle de la couche de métal liquide, c'est-à-dire sur l'épaisseur du revêtement désirée.
The present invention aims, secondly, a device for the implementation of this method. This device implements:
  • - On the one hand, a sensor, or a group of sensors for measuring the coating thickness, of the type described in the French patent mentioned above, said group of sensors, fixed to the blowing device described above with reference to FIG. 1, permanently supplying information relating to the profile of the coating produced by this blowing device, which makes it possible to avoid any delay between the moment when the coating is formed and the moment when the information on this coating is provided by the measuring means; and,
  • - on the other hand, blowing nozzles making it possible to locally modify the blowing conditions on the strip, in order to act on the residual thickness of the layer of liquid metal, that is to say on the thickness of the desired coating.

Selon une caractéristique de l'invention, chaque capteur ou groupe de capteurs de mesure de l'épaisseur du revêtement est associé à un moyen conçu de façon à modifier les conditions de soufflage intéressant la zone de la bande concernée par ce capteur ou ce groupe de capteurs. Ce résultat peut être obtenu à l'aide d'une boucle de régulation analogique, numérique, etc.According to a characteristic of the invention, each sensor or group of sensors for measuring the thickness of the coating is associated with a means designed so as to modify the blowing conditions affecting the zone of the strip concerned by this sensor or group of sensors. This can be achieved using an analog, digital, etc. control loop.

Selon un autre aspect de cette invention, celle-ci vise différents modes de réalisation de buses de soufflage, pouvant être utilisées dans le dispositif de contrôle et de régulation de l'épaisseur du revêtement spécifié ci-dessus.According to another aspect of this invention, it relates to different embodiments of blowing nozzles, which can be used in the device for controlling and regulating the thickness of the coating specified above.

D'autres caractéristiques et avantages de la présente invention ressortiront de la description faite ci-après en référence aux dessins annexés, qui en illustrent divers exemples de réalisation dépourvus de tout caractère limitatif. Sur ces dessins :

  • - la Figure 1 est une vue schématique, en coupe verticale, de l'installation de type connu décrite ci-dessus ;
  • - la Figure 2 est une vue similaire à la Figure 1, représentant un exemple de réalisation d'un dispositif selon l'invention ; et,
  • - les Figures 3 et 4 sont des vues schématiques, à plus grande échelle, représentant, en coupe verticale, des exemples de réalisation de buses de soufflage mises en oeuvre dans le dispositif selon l'invention.
Other characteristics and advantages of the present invention will emerge from the description given below with reference to the appended drawings, which illustrate various embodiments thereof which are in no way limiting in nature. In these drawings:
  • - Figure 1 is a schematic view, in vertical section, of the installation of known type described above;
  • - Figure 2 is a view similar to Figure 1, showing an embodiment of a device according to the invention; and,
  • - Figures 3 and 4 are schematic views, on a larger scale, showing, in vertical section, exemplary embodiments of blowing nozzles used in the device according to the invention.

En se référant en premier lieu à la Figure 2, on voit que le dispositif selon la présente invention comprend des capteurs de mesure de l'épaisseur du revêtement déposé sur la bande 14. Ces capteurs 26, 26' (ou groupes de capteurs) sont de préférence du type décrit dans le brevet français n° 84 16 290. Chaque capteur ou groupe de capteurs est fixé sur le système de soufflage constitué par les buses 18, 18', analogues aux buses décrites ci-dessus en référence à la Figure 1. Les capteurs fournissent donc en permanence les informations relatives au profil du revêtement obtenu par le soufflage de la mince lame de gaz au travers des fentes 24, 24' des buses de soufflage 18, 18'. Ainsi qu'on l'a précisé ci-dessus, il n'existe pas de retard entre le moment où se forme le revêtement et l'instant où l'information relative au revêtement est fournie par les capteurs de mesure 26, 26'. Selon l'invention, on réalise les buses de soufflage 18, 18' de façon à permettre de modifier localement les conditions de soufflage sur la bande et d'agir ainsi sur l'épaisseur résiduelle de la couche de métal liquide, c'est-à-dire sur l'épaisseur du revêtement métallique mince déposée sur la bande 14.Referring first to Figure 2, we see that the device according to the present invention comprises sensors for measuring the thickness of the coating deposited on the strip 14. These sensors 26, 26 '(or groups of sensors) are preferably of the type described in French patent n ° 84 16 290. Each sensor or group of sensors is fixed to the blowing system constituted by the nozzles 18, 18 ', similar to the nozzles described above with reference to Figure 1 The sensors therefore continuously supply information relating to the profile of the coating obtained by the blowing the thin gas blade through the slots 24, 24 'of the blowing nozzles 18, 18'. As specified above, there is no delay between the time when the coating is formed and the time when the information relating to the coating is provided by the measurement sensors 26, 26 '. According to the invention, the blowing nozzles 18, 18 ′ are produced so as to make it possible to locally modify the blowing conditions on the strip and thus to act on the residual thickness of the layer of liquid metal, ie ie on the thickness of the thin metallic coating deposited on the strip 14.

Les Figures 3 et 4 représentent des exemples deréalisation de buses pouvant être utilisées dans le dispositif illustré par la Figure 2.Figures 3 and 4 show examples of the realization of nozzles that can be used in the device illustrated in Figure 2.

Dans l'exemple de réalisation représenté sur la Figure 3, la buse de soufflage est munie, en amont de la fente d'éjection 24 du gaz, d'une ou de plusieurs ouvertures de fuite 28, permettant de réduire localement le débit traversant la fente 24, sans en modifier la direction, mais en modifiant les conditions locales de l'essorage. Ce débit de fuite est réglé par l'intermédiaire de vannes, telles que 30, placées sur un tuyau de dégagement et actionnées par l'intermédiaire d'une boucle de régulation qui reçoit l'information à partir du signal de l'un ou de plusieurs des capteurs de mesure d'épaisseur 26, 26', placés au-dessus de la buse de soufflage.In the embodiment shown in FIG. 3, the blowing nozzle is provided, upstream of the gas ejection slot 24, with one or more leak openings 28, making it possible to locally reduce the flow rate passing through the slot 24, without changing the direction, but by changing the local spin conditions. This leakage rate is regulated by means of valves, such as 30, placed on a relief pipe and actuated by means of a regulation loop which receives information from the signal of one or several of the thickness measurement sensors 26, 26 ′, placed above the blowing nozzle.

Dans l'exemple de réalisation représenté sur la Figure 4, on utilise une buse de soufflage déformable, ce qui permet de modifier l'épaisseur de la lame mince de gaz insufflé au travers de la fente 24. A cet effet, la buse comporte un élément fixe 36 et un élément mobile 36' qui est monté sur l'élément fixe par l'intermédiaire d'une lame déformable 32. On utilise un organe de commande, tel qu'une vis 34 ou un vérin, pour réaliser la déformation de la buse. On obtient ainsi une modification locale des conditions de soufflage, grâce à l'action de la vis 34 sur l'élément déformable 36' de la buse, ce qui permet de faire varier la largeur de la fente de soufflage sous l'effet de l'action du circuit de régulation recevant les informations délivrées par le ou les groupes de capteurs de mesure de l'épaisseur du revêtement associés aux buses et à leurs systèmes de commande de déformation (vis 34, vérin ou similaire).In the embodiment shown in Figure 4, a deformable blowing nozzle is used, which makes it possible to modify the thickness of the thin blade of gas blown through the slot 24. For this purpose, the nozzle comprises a fixed element 36 and a mobile element 36 'which is mounted on the fixed element by means of a deformable blade 32. A control member, such as a screw 34 or a jack, is used to deform the the nozzle. A local modification of the blowing conditions is thus obtained, thanks to the action of the screw 34 on the deformable element 36 'of the nozzle, which makes it possible to vary the width of the blowing slot under the effect of the action of the regulation circuit receiving the information delivered by the group or groups of sensors for measuring the thickness of the coating associated with the nozzles and their deformation control systems (screws 34, cylinder or the like).

Le procédé et le dispositif objet de la présente invention s'appliquent plus particulièrement à la galvanisation. Cependant, l'invention n'est pas limitée à cette application, et elle n'est pas limitée non plus à une régulation du revêtement liquide par essorage pneumatique. On peut en effet envisager des techniques de détection d'épaisseur, dans lesquelles on introduit la possibilité d'action locale sur l'épaisseur du revêtements, en jouant sur un ou plusieurs paramètres régissant le procédé de dépôt.The method and the device which are the subject of the present invention apply more particularly to galvanization. However, the invention is not limited to this application, nor is it limited to regulating the liquid coating by pneumatic spinning. We can indeed consider thickness detection techniques, in which we introduce the possibility of local action on the thickness of the coatings, by playing on one or more parameters governing the deposition process.

Claims (11)

1. Procédé pour le contrôle et la régulation de l'épaisseur d'un revêtement métallique déposé sur un support, notamment sur une bande, caractérisé en ce qu'il consiste à recevoir en continu et simultanément les informations relatives à l'épaisseur du revêtement réalisé sur ledit support, en plusieurs points de celui-ci, et à transmettre lesdites informations à des moyens de régulation d'épaisseur associés.1. Method for controlling and regulating the thickness of a metallic coating deposited on a support, in particular on a strip, characterized in that it consists in receiving continuously and simultaneously information relating to the thickness of the coating produced on said support, at several points thereof, and in transmitting said information to associated thickness control means. 2. Procédé selon la revendication 1, caractérisé en ce qu'on réalise une liaison directe entre les moyens délivrant les informations relatives à l'épaisseur du revêtement et les moyens de régulation associés couvrant la même zone du support muni du revêtement.2. Method according to claim 1, characterized in that a direct connection is made between the means delivering the information relating to the thickness of the coating and the associated regulation means covering the same area of the support provided with the coating. 3. Dispositif pour la mise en oeuvre d'un procédé selon l'une des revendications 1 ou 2, caractérisé en ce qu'il comprend : d'une part, un capteur ou un groupe de capteurs (26, 26') de mesure de l'épaisseur du revêtement déposé sur le support, de préférence une bande métallique en déplacement continu, ledit groupe de capteurs fournissant en permanence les informations relatives au profil du revêtement obtenu, et, d'autre part, des moyens de régulation associés (18, 18') couvrant la même zone de la bande et agissant sur l'épaisseur du revêtement désirée.3. Device for implementing a method according to one of claims 1 or 2, characterized in that it comprises: on the one hand, a sensor or a group of sensors (26, 26 ') for measuring of the thickness of the coating deposited on the support, preferably a continuously moving metal strip, said group of sensors continuously supplying information relating to the profile of the coating obtained, and, on the other hand, associated regulation means (18 , 18 ') covering the same zone of the strip and acting on the desired coating thickness. 4. Dispositif selon la revendication 3, caractérisé en ce que lesdits capteurs mesurent l'épaisseur de la bande à partir de la mesure des pertes correspondant à l'effet Joule, dû aux courants de Foucault qui apparaissent lorsqu'on approche de la surface métallique un circuit magnétique excité par une tension alternative.4. Device according to claim 3, characterized in that said sensors measure the thickness of the strip from the measurement of the losses corresponding to the Joule effect, due to the eddy currents which appear when approaching the metal surface a magnetic circuit excited by an alternating voltage. 5. Dispositif selon l'une quelconque des revendications 3 et 4, caractérisé en ce que les moyens agissant sur l'épaisseur du revêtement consistent en des buses de soufflage (18, 18') permettant de modifier localement les conditions de soufflage sur la bande d'une mince lame de gaz.5. Device according to any one of claims 3 and 4, characterized in that the means acting on the thickness of the coating consist of blowing nozzles (18, 18 ') making it possible to locally modify the blowing conditions on the strip a thin blade of gas. 6. Dispositif selon l'une quelconque des revendications 3 à 5, caractérisé en ce que chaque capteur ou groupe de capteurs (26, 26') est associé à un moyen permettant de modifier les conditions de soufflage intéressant la zone de la bande (14) concernée par ledit capteur ou ledit groupe de capteurs, ce moyen pouvant être conçu sous la forme d'une boucle de régulation.6. Device according to any one of claims 3 to 5, characterized in that each sensor or group of sensors (26, 26 ') is associated with a means for modifying the blowing conditions affecting the zone of the strip (14) concerned by said sensor or said group of sensors, this means being able to be designed in the form of a regulation loop. 7. Dispositif selon l'une quelconque des revendications 3 à 6, caractérisé en ce que les capteurs ou groupes de capteurs (26, 26') sont montés au-dessus des moyens agissant sur l'épaisseur du revêtement.7. Device according to any one of claims 3 to 6, characterized in that the sensors or groups of sensors (26, 26 ') are mounted above the means acting on the thickness of the coating. 8. Dispositif selon l'une quelconque des revendications 3 à 7, caractérisé en ce que les capteurs sont placés avant le point de contact de la bande avec le premier rouleau de renvoi situé après le bain (10) dans lequel passe la bande.8. Device according to any one of claims 3 to 7, characterized in that the sensors are placed before the point of contact of the strip with the first deflection roller located after the bath (10) through which the strip passes. 9. Dispositif selon l'une quelconque des revendications 3 à 8, caractérisé en ce que les moyens agissant sur l'épaisseur du revêtement sont réalisés sous la forme de buses de soufflage comportant une fente d'insufflation (24) munie d'au moins une ouverture de fuite (28) permettant de réduire localement le débit traversant ladite fente, ce débit de fuite étant réglé par l'intermédiaire de vannes (30) actionnées à l'aide d'une boucle de régulation qui reçoit son information à partir du signal de l'un ou de plusieurs des capteurs de mesure d'épaisseur (26, 26').9. Device according to any one of claims 3 to 8, characterized in that the means acting on the thickness of the coating are made in the form of blowing nozzles comprising a blowing slot (24) provided with at least a leakage opening (28) making it possible to locally reduce the flow rate passing through said slot, this leakage flow rate being regulated by means of valves (30) actuated by means of a regulation loop which receives its information from the signal from one or more of the thickness measurement sensors (26, 26 '). 10. Dispositif selon l'une quelconque des revendications 3 à 8, caractérisé en ce qu'il comporte,des buses de soufflage déformables permettant de modifier l'épaisseur de la lame mince de gaz insufflé au travers de la fente (24) de chaque buse.10. Device according to any one of claims 3 to 8, characterized in that it comprises, deformable blowing nozzles making it possible to modify the thickness of the thin blade of gas blown through the slot (24) of each nozzle. 11. Dispositif selon la revendication 10, caractérisé en ce que chacune desdites buses comporte un élément fixe (36) et un élément mobile (36') monté sur ledit élément fixe par l'intermédiaire d'un élément déformable (32), un organe de commande (34) étant prévu pour réaliser la déformation de la fente de soufflage permettant de modifier localement les conditions de soufflage sous l'effet de l'action du circuit de régulation recevant les informations délivrées par le ou les groupes de capteurs (26, 26') associés auxdites buses et à leurs systèmes de commande de déformation.11. Device according to claim 10, characterized in that each of said nozzles comprises a fixed element (36) and a movable element (36 ') mounted on said fixed element by means of a deformable element (32), a member control (34) being provided for deforming the blowing slot making it possible to locally modify the blowing conditions under the effect of the action of the regulation circuit receiving the information delivered by the group or groups of sensors (26, 26 ') associated with said nozzles and their deformation control systems.
EP85402417A 1984-12-14 1985-12-04 Process and apparatus for controlling and regulating the coating thickness of supports Withdrawn EP0186564A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8419204 1984-12-14
FR8419204A FR2574957A1 (en) 1984-12-14 1984-12-14 METHOD AND DEVICE FOR CONTROLLING AND REGULATING THE THICKNESS OF A THIN METAL COATING DEPOSITED ON A SUPPORT

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JP (1) JPS61143574A (en)
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DE (1) DE186564T1 (en)
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FR (1) FR2574957A1 (en)

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FR2690170A1 (en) * 1992-04-17 1993-10-22 Clecim Sa Device with an air knife regulating a metal deposit.
KR20020050858A (en) * 2000-12-22 2002-06-28 신현준 Nozzle gap control apparatus of air knife and its method
EP3734220A1 (en) * 2020-02-21 2020-11-04 Primetals Technologies Austria GmbH Installation for measuring the coating thickness of a running metal product

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CN104279931B (en) * 2013-07-12 2017-03-29 松下能源(无锡)有限公司 The device and method that the thickness of square shaped battery is measured

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FR2690170A1 (en) * 1992-04-17 1993-10-22 Clecim Sa Device with an air knife regulating a metal deposit.
US5332437A (en) * 1992-04-17 1994-07-26 Clecim Air knife device for regulating a metal deposit
KR20020050858A (en) * 2000-12-22 2002-06-28 신현준 Nozzle gap control apparatus of air knife and its method
EP3734220A1 (en) * 2020-02-21 2020-11-04 Primetals Technologies Austria GmbH Installation for measuring the coating thickness of a running metal product

Also Published As

Publication number Publication date
DE186564T1 (en) 1986-12-18
JPS61143574A (en) 1986-07-01
ES8700884A1 (en) 1986-12-01
ES549636A0 (en) 1986-12-01
FR2574957A1 (en) 1986-06-20
AU5075085A (en) 1986-06-19

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