EP0162989B1 - Process and device for producing a galvanized steel sheet or strip not coated by pure zinc at at least one surface - Google Patents

Process and device for producing a galvanized steel sheet or strip not coated by pure zinc at at least one surface Download PDF

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Publication number
EP0162989B1
EP0162989B1 EP84401121A EP84401121A EP0162989B1 EP 0162989 B1 EP0162989 B1 EP 0162989B1 EP 84401121 A EP84401121 A EP 84401121A EP 84401121 A EP84401121 A EP 84401121A EP 0162989 B1 EP0162989 B1 EP 0162989B1
Authority
EP
European Patent Office
Prior art keywords
strip
brush
zinc
coating
brushing
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.)
Expired
Application number
EP84401121A
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German (de)
French (fr)
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EP0162989A1 (en
Inventor
Robert Haaser
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.)
USINOR SA
Original Assignee
Union Siderurgique du Nord et de lEst de France SA USINOR
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8192890&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0162989(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Union Siderurgique du Nord et de lEst de France SA USINOR filed Critical Union Siderurgique du Nord et de lEst de France SA USINOR
Priority to DE8484401121T priority Critical patent/DE3469917D1/en
Priority to AT84401121T priority patent/ATE33043T1/en
Priority to EP84401121A priority patent/EP0162989B1/en
Priority to BR8502567A priority patent/BR8502567A/en
Priority to MX205430A priority patent/MX162647A/en
Priority to SU3899255A priority patent/SU1389685A3/en
Priority to CA000482663A priority patent/CA1225550A/en
Priority to US06/739,080 priority patent/US4594272A/en
Priority to CS385585A priority patent/CS273605B2/en
Priority to KR1019850003769A priority patent/KR900000299B1/en
Priority to ES544304A priority patent/ES8609503A1/en
Priority to AU43152/85A priority patent/AU575650B2/en
Publication of EP0162989A1 publication Critical patent/EP0162989A1/en
Priority to ES1986292492U priority patent/ES292492Y/en
Publication of EP0162989B1 publication Critical patent/EP0162989B1/en
Application granted granted Critical
Expired legal-status Critical Current

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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
    • C23C2/22—Removing excess of molten coatings; Controlling or regulating the coating thickness by rubbing, e.g. using knives, e.g. rubbing solids

Definitions

  • This invantion relates to the manufacture of galvanized steel sheets or strips, in particular stampable.
  • the present invention seeks to remedy this drawback by improving the ease of operation of the installation for industrial implementation of the process, which also results in an improvement in the quality of the product and in its profitability taking into account the reduced losses for adjustment for each production campaign.
  • the present invention thus relates to a method of manufacturing a strip of hot-dip galvanized steel sheet free of coating of pure Zn or based on Zn on at least one face, in which the strip is passed continuously through a conventional dip galvanizing bath, part of the coating of liquid Zn deposited on the strip is wiped by pneumatic means, at least one side of this strip is subjected to mechanical action in order to completely remove the coating based on non-Zn alloyed with iron, leaving only a thin layer of iron-zinc alloy, and the zinc particles removed from the brushed surface of the strip are recovered, characterized in that this mechanical action is exerted on the layer of zinc-based coating at a fixed level where the zinc is still liquid, using a brush, at least the bristles of which are subjected to cooling by a gas stream under forced circulation.
  • Zn coating or Zn coating is used for simplicity to denote a coating deposited from a dip galvanizing bath which may contain other metals such as, for example, aluminum in varying proportions over a wide range.
  • An originality of the present invention therefore lies in the fact that the zinc coating is brushed in the liquid state.
  • it is essential to sufficiently cool the bristles in order to cause solidification of the liquid zinc in contact with the bristles of the brush, all the more so when the quantity of Zn to be eliminated is greater and the temperature of the latter higher.
  • the improvement provided by the invention makes it possible to overcome the relatively critical adjustment of the brushing height, which is of considerable interest taking into account the variations in running speed that a galvanizing line can undergo in operation. Furthermore, when changing parameters such as the thickness of the strip, it is also not required to determine the brushing area in a relatively precise manner and thus to vary the height of the brushing device in a vertical plane above the surface of the zinc bath.
  • this advantage results in the fact that no device for adjusting the height of the brush, relative to the surface of the zinc bath, is necessary and that the latter can therefore be maintained at a predetermined fixed level in a horizontal plane.
  • the invention proceeds however from the same inventive concept as for European patent n ° 0 011 547 of which it is an improvement, because to obtain the expected result, namely the elimination of the coating of unalloyed Zn, it is necessary, if the brush a layer of liquid zinc, to cool the bristles of the brush vigorously, which causes by heat exchange with the cold bristles of the brush which come into contact with an elementary zone of zinc surrounding the end of the bristle passage of this coating of unalloyed zinc in its transient liquid-solid state characterized by its great friability.
  • the metallic bristles of the brush are vigorously cooled by placing this brush in a forced gas stream, which in practice is air.
  • the forced gas stream has a dual function of cooling the bristles of the bros and solidifying the droplets of liquid Zn possibly projected during brushing in the form of solid particles.
  • the hollow shaft of the brush is conventionally cooled by circulation of a cooling fluid.
  • the invention also relates to a brushing device for implementing the method, comprising a support located along the path of the strip above the surface of the zinc bath and carrying a rotary cylindrical brush, placed in a casing and the end of the bristles of which is in contact with the surface of the strip opposite which it is placed, and at least one counter roller bearing in contact with the opposite face of the strip, characterized in that the arter extends well in the direction perpendicular to the axis of the strip relative to the edges of the latter and comprises two zones separated by a wall extending to the vicinity of the lower generatrix of the brush, the first zone which surrounds most of the external surface of the brush and which is in a position opposite the strip with respect to the brush, cooperating with means of forced circulation of a gaseous flow of cooling and the second zone, located opposite the strip and below the brush, being provided with means for recovering dust or particles of zinc which are eliminated from the brushed surface of the strip.
  • the second zone preferably comprises inclined flaps channeling the particles of solidified zinc towards a discharge conduit connected to a hopper for recovering the finely divided particles of solidified zinc.
  • the device comprises, opposite the face opposite to the brushing face, vertical deflectors delimiting vertical baffles channeling the gas flow and preventing redeposition on the face comprising the zinc coating, particles generated by the brushing.
  • these vertical deflectors are placed so that they surround the support roller over a large part of its periphery.
  • these deflectors are cut in a substantially central zone by a wall in the form of an inclined plane directed towards the strip, opening into a gutter for collecting dust or Zn particles.
  • Figure 1 a conventional dip galvanizing installation comprising a bath 1 of molten zinc into which penetrates a strip 2 of sheet steel from a furnace not shown, and circulating in a channel 3 under a protective atmosphere.
  • This strip is returned by a roller 4 at the bottom of the tank and leaves the zinc bath vertically, being wiped by a pneumatic device 5 located in the vicinity of the surface of the zinc bath.
  • the strip continues its path vertically as indicated by arrow 6 after having passed through the zinc coating brushing device according to the present invention.
  • This device comprises a support 8 movable in translation in a horizontal plane and parallel to the plane of the strip, for example on rails 9.
  • a brush 10 is integral with this support and driven in rotation, by means not shown thanks to a motor 11 mounted on the support.
  • the hub 10a of this brush is preferably hollow and traversed by a cooling fluid.
  • a counter-roller 12 placed opposite the face of the strip opposite to brushing provides support for the strip which it pushes back in the direction of the bristles of the brush so that the plane of the strip is slightly secant to the envelope of the end of the bristles of the brush 10.
  • the brush 10 is housed in a casing 13 described below in detail in FIG. 2.
  • This casing 13 is connected on the one hand to a circuit 14 for forced circulation of a brush cooling gas opening into a hopper 15, the circuit is put into suction by a blower 16.
  • the casing 13 is connected on the other hand to a circuit 17 for dust extraction, opening into a hopper 18 and equipped with another blower 19.
  • the two circuits 14 and 17 are thus put into suction to limit as much as possible the release and circulation of dust.
  • the casing enveloping the brush 10 comprises a baffle 20 for entering the stream of cooling gas in forced circulation by suction. It is moreover separated into two distinct zones by a wall 21 whose upper edge 21? is arranged in the vicinity of the lower generator of the brush 10.
  • This zone 22 flows the stream of cooling gas from the brush.
  • This zone of forced circulation surrounds the major part of the external surface of the cylindrical brush so as to ensure its most effective cooling and is located in a position opposite to the strip 2 relative to the brush 10.
  • This zone of forced circulation cooling gas opens into a box 23, connected to the cooling gas suction circuit 14.
  • the second zone 24, separated in an almost leaktight manner from the zone 22 by the wall 21, at least as regards the zinc particles generated by brushing, is located opposite the face of the strip comprising a coating of liquid zinc which will be brushed by brush 10.
  • This zone 24 comprises deflector flaps 25, 26, 27, in the form of inclined planes and which channel the solidified zinc particles ejected towards the base of the casing 13 where they are recovered by suction by the pipe 29 connected to the suction circuit 17 zinc dust.
  • These flaps are preferably orientable around horizontal axes and extend through slots 138 of the casing.
  • Deflectors 30a, 30b regularly spaced and surrounding the support roller 12 over a large part of its periphery are placed vertically, as appears in Figure 3, so as to vertically channel the existing gas stream on the face of the opposite strip brushing. These vertical deflectors 30 q , 30b form vertical baffles preventing the possible redeposition of the zinc dust generated by brushing the opposite face and which could adversely affect the face with the conventional zinc coating.
  • Vertical baffles 30 a, 30b are separated in a substantially central region by a wall 31 in the form of an inclined plane, directed towards the web 2 and perpendicular to the deflectors.
  • This inclined plane opens out along its lower edge into a gutter 32 with which it delimits a slope 315 of relatively small width and which is connected to the circuit 14 for circulation of the cooling gas of the brush ( Figures 2 and 3).
  • the deflectors 30b, located below the wall 31 are arranged, preferably in two groups located in the vicinity of the edges of the sheet, and separated by a central area 33, ( Figure 4).
  • the gas circulation current induced around the strip 2 on the opposite face of the backing roller 12 is partitioned and channeled as indicated by the arrows so as to effectively prevent the possible redeposition of the zinc particles generated by brushing, beyond the edges on the face with classic zinc coating.

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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)
  • Electroplating Methods And Accessories (AREA)
  • Nonmetallic Welding Materials (AREA)

Abstract

The invention relates to a process for manufacturing a strip of hot galvanized sheet steel devoid of a coating of pure Zn or a coating based on Zn on at least one side of the strip, comprising passing the strip continuously in a conventional dipping galvanization bath, wiping by pneumatic means a part of the coating of liquid Zn deposited on the strip, and subjecting at least one side of the strip to a mechanical action for completely eliminating the coating based on zinc which is not alloyed to the iron, by allowing to subsist only a thin iron-zinc alloy layer, said mechanical action on the layer of coating based on zinc which is still liquid being exerted by means of a brush at least the bristles of which are energetically cooled. The invention also provides a cooled brushing device (10) for carrying out the process.

Description

La présente invantion est relative à la fabrication de tôles ou de feuillards d'acier galvanisé, notamment emboutissables.This invantion relates to the manufacture of galvanized steel sheets or strips, in particular stampable.

On connaît en particulier d'après le brevet européen n° 0 011 547 un procédé et un dispositif pour la fabrication de tôles d'acier emboutissables galvanisées à chaud dans lequel, après enduction au trempé dans un bain à base de Zn en fusion, une des faces de la bande est soumise à une action mécanique, notamment un brossage, dans une zona où le revêtement de Zn présent sur la tôle passe par un état transitoire liquide-solide qui se caractérise par sa friabilité. Cet état est atteint en théorie peu après la solidification du zinc.Particularly known from European Patent No. 0 011 547 is a process and a device for the production of stampable hot-dip galvanized steel sheets in which, after dip coating in a bath based on molten Zn, a of the faces of the strip is subjected to a mechanical action, in particular brushing, in a shingles where the coating of Zn present on the sheet passes through a liquid-solid transient state which is characterized by its friability. This state is reached in theory shortly after the solidification of the zinc.

Cependant d'un point de vue pratique, sur une ligne de fabrication industrielle, le brossage en un tel point pose le problème de la détermination exacte de sa hauteur par rapport au niveau du bain, compte tenu de la température de ce dernier, de l'épaisseur de la bande, de la vitesse de défilement de la bande et également de l'intensité de fonctionnement des dispositifs pneumatiques qui sont utilisés pour essuyer partiellement en l'uniformisant le revêtement de Zn déposé.However from a practical point of view, on an industrial production line, brushing at such a point poses the problem of determining its exact height relative to the level of the bath, taking into account the temperature of the latter, the the thickness of the strip, the speed of travel of the strip and also the intensity of operation of the pneumatic devices which are used for partially wiping and uniforming the coating of deposited Zn.

La présente invention vise à remédier à cet inconvénient en améliorant la facilité de conduite de l'installation de mise en oeuvre industrielle du procédé, ce qui se traduit également par une amélioration de la qualité du produit et de sa rentabilité compte tenu des pertes réduites pour réglage à chaque campagne de fabrication.The present invention seeks to remedy this drawback by improving the ease of operation of the installation for industrial implementation of the process, which also results in an improvement in the quality of the product and in its profitability taking into account the reduced losses for adjustment for each production campaign.

La présente invention a ainsi pour objet un procédé de fabrication d'une bande de tôle d'acier galvanisée à chaud exempte de revêtement de Zn pur ou à base de Zn sur au moins une face, dans lequel on fait passer la bande en continu dans un bain de galvanisation au trempé classique, on essuie par des moyens pneumatiques une partie du revêtement de Zn liquide déposé sur la bande, on soumet au moins une face de cette bande à une action mecanique pour en éliminer complètement le revêtement à base de Zn non allié au fer, en ne laissant subsister qu'une mince couche d'alliage fer-zinc, et on récupère les particules de zinc éliminées de la surface brossée de la bande, caractérisé en ce qu'on exerce cette action mécanique sur la couche de revêtement à base de zinc à un niveau fixe où le zinc est encore liquide, à l'aide d'une brosse dont au moins les poils sont soumis à un refroidissement par un courant gazeux sous circulation forcée.The present invention thus relates to a method of manufacturing a strip of hot-dip galvanized steel sheet free of coating of pure Zn or based on Zn on at least one face, in which the strip is passed continuously through a conventional dip galvanizing bath, part of the coating of liquid Zn deposited on the strip is wiped by pneumatic means, at least one side of this strip is subjected to mechanical action in order to completely remove the coating based on non-Zn alloyed with iron, leaving only a thin layer of iron-zinc alloy, and the zinc particles removed from the brushed surface of the strip are recovered, characterized in that this mechanical action is exerted on the layer of zinc-based coating at a fixed level where the zinc is still liquid, using a brush, at least the bristles of which are subjected to cooling by a gas stream under forced circulation.

Dans la suite du présent mémoire on utilise à titre de simplification l'expression revêtement de Zn ou à base de Zn pour désigner un revêtement déposé à partir d'un bain de galvanisation au trempé pouvant contenir d'autres métaux tels que par exemple l'aluminium en des proportions variant dans une large gamme.In the remainder of this specification, the term Zn coating or Zn coating is used for simplicity to denote a coating deposited from a dip galvanizing bath which may contain other metals such as, for example, aluminum in varying proportions over a wide range.

Une originalité de la présente invention réside donc dans le fait que le revêtement de zinc est brossé à l'état liquide. Cependant pour ne pas encrasser ou empâter la brosse, il est indispensable de suffisamment refroidir ses poils afin de provoquer une solidification du zinc liquide au contact des poils de la brosse et ce d'autant plus que la quantité de Zn à éliminer est plus importante et la température de ce dernier plus élevée.An originality of the present invention therefore lies in the fact that the zinc coating is brushed in the liquid state. However, in order not to clog or block the brush, it is essential to sufficiently cool the bristles in order to cause solidification of the liquid zinc in contact with the bristles of the brush, all the more so when the quantity of Zn to be eliminated is greater and the temperature of the latter higher.

Ainsi le perfectionnement apporté par l'invention permet de s'affranchir du réglage relativement critique de la hauteur de brossage, ce qui est d'un intérêt considérable compte tenu des variations de vitesse de défilement que peut subir une ligne de galvanisation en fonctionnement. Par ailleurs, lors de changements de paramètres tels que l'épaisseur de la bande, on n'est pas non plus astreint à déterminer la zone de brossage d'une manière relativement précise et à faire ainsi varier la hauteur du dispositif de brossage dans un plan vertical au-dessus de la surface du bain de zinc.Thus the improvement provided by the invention makes it possible to overcome the relatively critical adjustment of the brushing height, which is of considerable interest taking into account the variations in running speed that a galvanizing line can undergo in operation. Furthermore, when changing parameters such as the thickness of the strip, it is also not required to determine the brushing area in a relatively precise manner and thus to vary the height of the brushing device in a vertical plane above the surface of the zinc bath.

Au niveau de la mise en oeuvre industrielle, cet avantage se traduit par le fait qu'aucun dispositif de réglage de la hauteur de la brosse, par rapport à la surface du bain de zinc, n'est nécessaire et que cette dernière peut donc être maintenue à un niveau fixe prédéterminé dans un plan horizontal.At the level of industrial implementation, this advantage results in the fact that no device for adjusting the height of the brush, relative to the surface of the zinc bath, is necessary and that the latter can therefore be maintained at a predetermined fixed level in a horizontal plane.

L'invention procède cependant du même concept inventif que pour le brevet européen n° 0 011 547 dont elle est un perfectionnement, car pour obtenir le résultat attendu, à savoir l'élimination du revêtement de Zn non allié, il est nécessaire, si l'on brosse une couche de zinc liquide, de refroidir énergiquement les poils de la brosse, ce qui provoque par échange calorifique avec les poils de la brosse froids qui viennent au contact d'une zone élémentaire de zinc entourant l'extrémité du poil, le passage de ce revêtement de zinc non allié dans son état transitoire liquide-solide caractérisé par sa grande friabilité.The invention proceeds however from the same inventive concept as for European patent n ° 0 011 547 of which it is an improvement, because to obtain the expected result, namely the elimination of the coating of unalloyed Zn, it is necessary, if the brush a layer of liquid zinc, to cool the bristles of the brush vigorously, which causes by heat exchange with the cold bristles of the brush which come into contact with an elementary zone of zinc surrounding the end of the bristle passage of this coating of unalloyed zinc in its transient liquid-solid state characterized by its great friability.

Le refroidissement énergique des poils métalliques de la brosse est assuré en plaçant cette brosse dans un courant gazeux forcé, qui en pratique, est de l'air.The metallic bristles of the brush are vigorously cooled by placing this brush in a forced gas stream, which in practice is air.

Le courant gazeux forcé exerce une double fonction de refroidissement des poils de la bros et de solidification sous forme de particules solides des gouttelettes de Zn liquide éventuellement projetées lors du brossage.The forced gas stream has a dual function of cooling the bristles of the bros and solidifying the droplets of liquid Zn possibly projected during brushing in the form of solid particles.

On assure par ailleurs de façon classique le refroidissement de l'arbre creux de la brosse par circulation d'un fluide de refroidissement.Furthermore, the hollow shaft of the brush is conventionally cooled by circulation of a cooling fluid.

L'invention a également pour objet un dispositif de brossage pour la mise en oeuvre du procédé, comprenant un support situé le long du trajet de la bande au-dessus de la surface du bain de zinc et portant une brosse cylindrique rotative, placée dans un carter et dont l'extrémité des poils est en contact avec la surface de la bande en regard de laquelle elle est placée, et au moins un rouleau antagoniste d'appui au contact de la face opposée de la bande, caractérisé en ce que le arter déborde largement dans la direction perpendiculaire à l'axe de la bande par rapport aux rives de cette dernière et comporte deux zones séparées par une paroi s'étendant jusqu'au voisinage de la génératrice inférieure de la brosse, la première zone qui entoure la majeure partie de la surface extérieure de la brosse et qui se trouve en une position opposée à la bande par rapport à la brosse, coopérant avec des moyens de circulation forcée d'un coulant gazeux de refroidissement et la seconde zone, située en regard de la bande et au-dessous la brosse, étant munie de moyens de récupération des poussières ou particules de zinc qui sont éliminées de la surface brossée de la bande.The invention also relates to a brushing device for implementing the method, comprising a support located along the path of the strip above the surface of the zinc bath and carrying a rotary cylindrical brush, placed in a casing and the end of the bristles of which is in contact with the surface of the strip opposite which it is placed, and at least one counter roller bearing in contact with the opposite face of the strip, characterized in that the arter extends well in the direction perpendicular to the axis of the strip relative to the edges of the latter and comprises two zones separated by a wall extending to the vicinity of the lower generatrix of the brush, the first zone which surrounds most of the external surface of the brush and which is in a position opposite the strip with respect to the brush, cooperating with means of forced circulation of a gaseous flow of cooling and the second zone, located opposite the strip and below the brush, being provided with means for recovering dust or particles of zinc which are eliminated from the brushed surface of the strip.

Selon une autre caractéristique de l'invention, la seconde zone comporte de préférence des volets inclinés canalisant les particules de zinc solidifié vers un conduit d'évacuation relié à une trémie de récupération des particules finement divisées de zinc solidifié.According to another characteristic of the invention, the second zone preferably comprises inclined flaps channeling the particles of solidified zinc towards a discharge conduit connected to a hopper for recovering the finely divided particles of solidified zinc.

Selon encore une autre caractéristique, le dispositif comporte en regard de la face opposée à la face de brossage des déflecteurs verticaux délimitant des chicanes verticales canalisant l'écoulement gazeux et empêchant la redéposition sur la face comportant le revêtement de zinc, des particules générées par le brossage.According to yet another characteristic, the device comprises, opposite the face opposite to the brushing face, vertical deflectors delimiting vertical baffles channeling the gas flow and preventing redeposition on the face comprising the zinc coating, particles generated by the brushing.

Selon un mode de réalisation ces déflecteurs verticaux sont placés de telle sorte qu'ils entourent le rouleau d'appui sur une partie importante de sa périphérie.According to one embodiment, these vertical deflectors are placed so that they surround the support roller over a large part of its periphery.

Selon une variante ces déflecteurs sont coupés dans une zone sensiblement centrale par une paroi en forme de plan incliné dirigé vers la bande, débouchant dans une gouttière de récupération des poussières ou particules de Zn.According to a variant, these deflectors are cut in a substantially central zone by a wall in the form of an inclined plane directed towards the strip, opening into a gutter for collecting dust or Zn particles.

L'invention est exposée ci-après en détail à l'aide des dessins annexés qui en représentent un mode de réalisation. Sur ces dessins:

  • La Figure 1 est une vue schématique partielle en élévation d'une installation selon la présente invention.
  • La Figure 2 est une vue en élévation de côté et en coupe du dispositif de brossage de la Figure 1.
  • Les Figures 3 et 4 sont respectivement des vues en coupe selon les lignes 3-3 et 4-4 de la Figure 2.
The invention is described below in detail using the accompanying drawings which show an embodiment. In these drawings:
  • Figure 1 is a partial schematic elevational view of an installation according to the present invention.
  • Figure 2 is a side elevational view in section of the brushing device of Figure 1.
  • Figures 3 and 4 are sectional views along lines 3-3 and 4-4 of Figure 2, respectively.

Sur la Figure 1 est représentée une installation de galvanisation classique au trempé comportant un bain 1 de zinc en fusion dans lequel pénètre une bande 2 de tôle d'acier issue d'un four non représenté, et circulant dans un canal 3 sous atmosphère protectrice. Cette bande est renvoyée par un rouleau 4 de fond de cuve et sort verticalement du bain de zinc en étant essuyée par un dispositif pneumatique 5 situé au voisinage de la surface du bain de zinc.In Figure 1 is shown a conventional dip galvanizing installation comprising a bath 1 of molten zinc into which penetrates a strip 2 of sheet steel from a furnace not shown, and circulating in a channel 3 under a protective atmosphere. This strip is returned by a roller 4 at the bottom of the tank and leaves the zinc bath vertically, being wiped by a pneumatic device 5 located in the vicinity of the surface of the zinc bath.

La bande poursuit son trajet verticalement comme indiqué par la flèche 6 après avoir traversé le dispositif de brossage de revêtement de zinc selon la présente invention.The strip continues its path vertically as indicated by arrow 6 after having passed through the zinc coating brushing device according to the present invention.

Ce dispositif comporte un support 8 mobile en translation dans un plan horizontal et parallèlement au plan de la bande, par exemple sur des rails 9.This device comprises a support 8 movable in translation in a horizontal plane and parallel to the plane of the strip, for example on rails 9.

Une brosse 10 est solidaire de ce support et entrainée en rotation, par des moyens non représentés grâce à un moteur 11 monté sur le support. Le moyeu 10a de cette brosse est de préférence creux et parcouru par un fluide de refroidissement.A brush 10 is integral with this support and driven in rotation, by means not shown thanks to a motor 11 mounted on the support. The hub 10a of this brush is preferably hollow and traversed by a cooling fluid.

Un contre-rouleau 12 placé en regard de la face de la bande opposée au brossage fournit un appui à la bande qu'il repousse en direction des poils de la brosse de sorte que le plan de la bande soit légèrement sécant à l'enveloppe de l'extrémité des poils de la brosse 10.A counter-roller 12 placed opposite the face of the strip opposite to brushing provides support for the strip which it pushes back in the direction of the bristles of the brush so that the plane of the strip is slightly secant to the envelope of the end of the bristles of the brush 10.

La brosse 10 est logée dans un carter 13 décrit ci-après en détail à la Figure 2.The brush 10 is housed in a casing 13 described below in detail in FIG. 2.

Ce carter 13 est relié d'une part à un circuit 14 de circulation forcée d'un gaz de refroidissement de la brosse débouchant dans une trémie 15, le circuit est mis en aspiration par une soufflante 16.This casing 13 is connected on the one hand to a circuit 14 for forced circulation of a brush cooling gas opening into a hopper 15, the circuit is put into suction by a blower 16.

Le carter 13 est relié d'autre part à un circuit 17 d'aspiration des poussières, débouchant dans une trémie 18 et équipé d'une autre soufflante 19.The casing 13 is connected on the other hand to a circuit 17 for dust extraction, opening into a hopper 18 and equipped with another blower 19.

Les deux circuits 14 et 17 sont ainsi mis en aspiration pour limiter au maximum le dégagement et la circulation des poussières.The two circuits 14 and 17 are thus put into suction to limit as much as possible the release and circulation of dust.

Sur la Figure 2, le carter enveloppant la brosse 10, comporte une chicane 20 d'entrée du courant de gaz de refroidissement en circulation forcée par aspiration. Il est par ailleurs séparé en deux zones distinctes par une paroi 21 dont le bord supérieur 21? est disposé au voisinage de la génératrice inférieure de la brosse 10.In FIG. 2, the casing enveloping the brush 10 comprises a baffle 20 for entering the stream of cooling gas in forced circulation by suction. It is moreover separated into two distinct zones by a wall 21 whose upper edge 21? is arranged in the vicinity of the lower generator of the brush 10.

Dans la première zone 22 circule le courant de gaz de refroidissement de la brosse. Cette zone de circulation forcée entoure la majeure partie de la surface extérieure de la brosse cylindrique de façon à en assurer le refroidissement le plus efficace et se trouve en une position opposée à la bande 2 par rapport à la brosse 10. Cette zone de circulation forcée du gaz de refroidissement débouche dans un caisson 23, relié au circuit 14 d'aspiration du gaz de refroidissement.In the first zone 22 flows the stream of cooling gas from the brush. This zone of forced circulation surrounds the major part of the external surface of the cylindrical brush so as to ensure its most effective cooling and is located in a position opposite to the strip 2 relative to the brush 10. This zone of forced circulation cooling gas opens into a box 23, connected to the cooling gas suction circuit 14.

La seconde zone 24, séparée de façon quasi étanche de la zone 22 par la paroi 21, au moins pour ce qui est des particules de zinc générées par le brossage, est située en regard de la face de la bande comportant un revêtement de zinc liquide qui va être brossé par la brosse 10.The second zone 24, separated in an almost leaktight manner from the zone 22 by the wall 21, at least as regards the zinc particles generated by brushing, is located opposite the face of the strip comprising a coating of liquid zinc which will be brushed by brush 10.

Cette zone 24 comporte des volets déflecteurs 25, 26, 27, en forme de plans inclinés et qui canalisent les particules de zinc solidifiées éjectées vers la base du carter 13 où elles sont récupérées par aspiration par la conduite 29 reliée au circuit 17 d'aspiration des poussières de zinc. Ces volets sont de préférence orientables autour d'axes horizontaux et, s'étendent à travers des fentes 138 du carter.This zone 24 comprises deflector flaps 25, 26, 27, in the form of inclined planes and which channel the solidified zinc particles ejected towards the base of the casing 13 where they are recovered by suction by the pipe 29 connected to the suction circuit 17 zinc dust. These flaps are preferably orientable around horizontal axes and extend through slots 138 of the casing.

Des déflecteurs 30a, 30b régulièrement espacés et entourant le rouleau d'appui 12 sur une partie importante de sa périphérie sont placés verticalement, comme cela apparait sur la Figure 3, de façon à canaliser verticalement le courant gazeux existant sur la face de la bande opposée au brossage. Ces déflecteurs verticaux 30q, 30b forment des chicanes verticales empêchant la redéposition éventuelle des poussières de zinc générées par le brossage de la face opposée et qui pourraient affecter de façon défavorable la face portant le revêtement classique de zinc.Deflectors 30a, 30b regularly spaced and surrounding the support roller 12 over a large part of its periphery are placed vertically, as appears in Figure 3, so as to vertically channel the existing gas stream on the face of the opposite strip brushing. These vertical deflectors 30 q , 30b form vertical baffles preventing the possible redeposition of the zinc dust generated by brushing the opposite face and which could adversely affect the face with the conventional zinc coating.

Les déflecteurs verticaux 30a, 30b sont séparés dans une zone sensiblement médiane, par une paroi 31 en forme de plan incliné, dirigé vers la bande 2 et perpendiculaire aux déflecteurs. Ce plan incliné débouche le long de son bord inférieur dans une gouttière 32 avec laquelle il délimite une pente 315 de relativement faible largeur et qui est reliée au circuit 14 de circulation du gaz de refroidissement.de la brosse (Figures 2 et 3).Vertical baffles 30 a, 30b are separated in a substantially central region by a wall 31 in the form of an inclined plane, directed towards the web 2 and perpendicular to the deflectors. This inclined plane opens out along its lower edge into a gutter 32 with which it delimits a slope 315 of relatively small width and which is connected to the circuit 14 for circulation of the cooling gas of the brush (Figures 2 and 3).

Les déflecteurs 30b, situés au-dessous de la paroi 31 sont disposés, de préférence en deux groupes situés au voisinage des bords de la tôle, et séparés par une zone centrale 33, (Figure 4).The deflectors 30b, located below the wall 31 are arranged, preferably in two groups located in the vicinity of the edges of the sheet, and separated by a central area 33, (Figure 4).

Etant donné que le carter 13 et l'ensemble des déflecteurs 30a et 30b sont de largeur sensiblement égale et débordent largement des rives de la bande 2, comme cela est visible sur les Figures 3 et 4, le courant de circulation gazeux induit autour de la bande 2 sur la face en regard du contre-rouleau d'appui 12, est cloisonné et canalisé comme indiqué par les flèches de façon à empêcher efficacement la redéposition éventuelle des particules de zinc générées par le brossage, au-delà des rives sur la face à revêtement classique de zinc.Since the casing 13 and all of the deflectors 30a and 30b are of substantially equal width and extend well beyond the edges of the strip 2, as can be seen in FIGS. 3 and 4, the gas circulation current induced around the strip 2 on the opposite face of the backing roller 12, is partitioned and channeled as indicated by the arrows so as to effectively prevent the possible redeposition of the zinc particles generated by brushing, beyond the edges on the face with classic zinc coating.

Claims (11)

1. Process for manufacturing a hot galvanized sheet steel strip without any coating of pure Zn or a metal based on Zn on at least one side, comprising passing the strip continuously into a conventional dipping galvanization bath, wiping by pneumatic means a part of the coating of liquid Zn deposited on the strip and subjecting at least one side of said strip to a mechanical action for completely renoving the coating based on zinc not alloyed to the iron, leaving only a thin iron-zinc alloy layer and the zinc particles eliminated from the brushed surface of the strip are recovered, characterised in that the mechanical action is exerted on the layer of coating based on zinc which is still liquid by means of a brush, whereof at least the bristles are cooled by a gaseous stream with forced circulation.
2. Process according to claim 1, characterized in that the gas is air.
3. Process according to claims 1 or 2, characterized in that the forced circulation is produced by suction.
4. Brushing device for performing the process according to any one of the preceding claims comprising a support (8) located along the path of the strip (2) above the surface of the zinc bath (1) and carrying a rotary cylindrical brush (10), placed in a casing (13) and whose bristles have their ends in contact with the surface of the strip (2) facing which the brush is positioned, and at least one counter support roller (12) in contact with the opposite side of the strip, characterized in that the casing projects slightly in the direction perpendicular to the axis of the strip with respect to the edges of the latter and includes two regions (22, 24) separated by a wall (21) extending into the vicinity of the lower generatrix of the brush (10), the first region (22) surrounding most of the outer surface of the brush and which is located in an opposite position to the strip (2) with respect to the brush (10) co-operating with means for the forced circulation of a cooling gaseous stream and the second region (24) facing the strip (2) and below the brush (10) being provided with means for recovering dust or zinc particles which are eliminated from the brushed surface of the strip.
5. Device according to claim 4, characterized in that the second region (24) includes inclined flaps (25, 26, 27) which guide the solidified zinc particles to a discharge conduit (29) connected to a hopper (18) for recovering the finely divided, solidified zinc particles.
6. Device according to claim 5, characterized in that the inclined flaps (25, 26, 27) extend through slots (13a) in the casing.
7. Device according to claim 4, characterized in that each region (22, 24) is connected to a respective suction circuit (14, 17).
8. Device according to any one of the claims 4 to 7, characterized in that it is provided on the side opposite to the brushing side with vertical deflectors (30a, 30b) defining vertical baffles channeling the gaseous flow and preventing the re-deposition on the side carrying the zinc coating of dust produced by the brushing process.
9. Device according to claim 8, characterized in that the deflectors (30a, 30b) are separated in a substantially central region by a wall (31) in the form of an inclined plane directed towards strip (21) and issuing into a dust recovery trough (32).
10. Device according to claim 8, characterized in that trough (32) is connected to a suction circuit (14).
11. Device according to claim 10, characterized in that trough (32) is connected to the suction circuit (14) for the cooling gas for brush (10).
EP84401121A 1984-05-30 1984-05-30 Process and device for producing a galvanized steel sheet or strip not coated by pure zinc at at least one surface Expired EP0162989B1 (en)

Priority Applications (13)

Application Number Priority Date Filing Date Title
DE8484401121T DE3469917D1 (en) 1984-05-30 1984-05-30 Process and device for producing a galvanized steel sheet or strip not coated by pure zinc at at least one surface
AT84401121T ATE33043T1 (en) 1984-05-30 1984-05-30 METHOD AND DEVICE FOR PRODUCTION OF A SHEET METAL OR STRIP GALVANIZED ON AT LEAST ONE SIDE.
EP84401121A EP0162989B1 (en) 1984-05-30 1984-05-30 Process and device for producing a galvanized steel sheet or strip not coated by pure zinc at at least one surface
CA000482663A CA1225550A (en) 1984-05-30 1985-05-29 Process and device for manufacturing sheet metal or galvanized steel strip devoid of pure zinc coating on at least on side
MX205430A MX162647A (en) 1984-05-30 1985-05-29 PERFECTED PROCEDURE AND DEVICE FOR THE MANUFACTURE OF GALVANIZED STEEL SHEET OR BAND FREE OF ZINC COATING IN AT LEAST ONE OF ITS SIDES
SU3899255A SU1389685A3 (en) 1984-05-30 1985-05-29 Arrangement for manufacturing strip from hot zinc-plated steel
BR8502567A BR8502567A (en) 1984-05-30 1985-05-29 PROCESS OF MANUFACTURING A HOT-GALVANIZED STEEL SHEET BELT EXEMPT FROM PURE ZINC COATING OR ZINC BASE AT LEAST ONE FACE AND BRUSHING DEVICE FOR APPLICATION OF THE PROCESS
US06/739,080 US4594272A (en) 1984-05-30 1985-05-29 Process and device for manufacturing sheet metal or galvanized steel strip devoid of a pure zinc coating on at least one side
CS385585A CS273605B2 (en) 1984-05-30 1985-05-29 Method of galvanized steel band production,free from zinc coating at least on one side, and equipment for realization of this method
ES544304A ES8609503A1 (en) 1984-05-30 1985-05-30 Process and device for producing a galvanized steel sheet or strip not coated by pure zinc at at least one surface.
KR1019850003769A KR900000299B1 (en) 1984-05-30 1985-05-30 Method and apparatus for manufacturing metal sheet or galvanized steel strip without pure zinc coating on one side
AU43152/85A AU575650B2 (en) 1984-05-30 1985-05-30 Galvanizing so that at least one side is devoid of a coating
ES1986292492U ES292492Y (en) 1984-05-30 1986-02-14 DEVICE FOR THE MANUFACTURE OF A GALVANIZED STEEL SHEET BAND FREE OF ZINC COATINGS IN AT LEAST ONE OF ITS SIDES

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP84401121A EP0162989B1 (en) 1984-05-30 1984-05-30 Process and device for producing a galvanized steel sheet or strip not coated by pure zinc at at least one surface

Publications (2)

Publication Number Publication Date
EP0162989A1 EP0162989A1 (en) 1985-12-04
EP0162989B1 true EP0162989B1 (en) 1988-03-16

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Application Number Title Priority Date Filing Date
EP84401121A Expired EP0162989B1 (en) 1984-05-30 1984-05-30 Process and device for producing a galvanized steel sheet or strip not coated by pure zinc at at least one surface

Country Status (12)

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US (1) US4594272A (en)
EP (1) EP0162989B1 (en)
KR (1) KR900000299B1 (en)
AT (1) ATE33043T1 (en)
AU (1) AU575650B2 (en)
BR (1) BR8502567A (en)
CA (1) CA1225550A (en)
CS (1) CS273605B2 (en)
DE (1) DE3469917D1 (en)
ES (2) ES8609503A1 (en)
MX (1) MX162647A (en)
SU (1) SU1389685A3 (en)

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EP3396009B1 (en) * 2015-12-24 2024-02-07 POSCO Co., Ltd Plated steel sheet having fine and even plating structure and plated steel sheet manufacturing method

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EP0162989B1 (en) * 1984-05-30 1988-03-16 UNION SIDERURGIQUE DU NORD ET DE L'EST DE LA FRANCE par abréviation "USINOR" Process and device for producing a galvanized steel sheet or strip not coated by pure zinc at at least one surface
ES2009820T5 (en) * 1986-06-12 1995-08-16 Duma Konstruktionsburo EVACUATION DEVICE FOR CONTINUOUS BILATERAL COVERAGE OF A METAL BELT.
CA1328166C (en) * 1988-09-29 1994-04-05 Hidekazu Kawano Two-fluid injection apparatus and a manufacturing apparatus including such injecting apparatus for manufacturing minimized spangle molten plated steel plate
KR20030014529A (en) * 2001-08-11 2003-02-19 재단법인 포항산업과학연구원 Zn coating remove system for section steel
DE102004059200B4 (en) * 2004-12-09 2010-12-23 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Apparatus and method for cooling substrates
DE102006050702A1 (en) * 2006-10-24 2008-04-30 Welser Profile Gmbh Apparatus and method for removing a metal coating
EP2028286A1 (en) * 2007-07-21 2009-02-25 Rasselstein GmbH Method for removing an excess coating on the band edge of galvanised metal coated steel strips
WO2009068700A1 (en) * 2007-11-26 2009-06-04 Alavesa De Trabajos Metalicos, S.L. Method and machine for removing excess metal from galvanised parts
EP2631012B1 (en) * 2012-02-21 2014-10-29 Cockerill Maintenance & Ingenierie S.A. System for reducing the wiping gas consumption in an air knife
CN105525246B (en) * 2016-03-02 2017-12-01 江苏法尔胜泓昇集团有限公司 A kind of steel-wire galvanizing smears zinc device
CN105525247B (en) * 2016-03-02 2017-12-08 江苏法尔胜泓昇集团有限公司 A kind of steel-wire galvanizing smears zinc method

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EP0162989B1 (en) * 1984-05-30 1988-03-16 UNION SIDERURGIQUE DU NORD ET DE L'EST DE LA FRANCE par abréviation "USINOR" Process and device for producing a galvanized steel sheet or strip not coated by pure zinc at at least one surface

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Publication number Priority date Publication date Assignee Title
EP3396009B1 (en) * 2015-12-24 2024-02-07 POSCO Co., Ltd Plated steel sheet having fine and even plating structure and plated steel sheet manufacturing method

Also Published As

Publication number Publication date
ES8609503A1 (en) 1986-09-01
AU575650B2 (en) 1988-08-04
EP0162989A1 (en) 1985-12-04
ES544304A0 (en) 1986-09-01
DE3469917D1 (en) 1988-04-21
US4594272A (en) 1986-06-10
AU4315285A (en) 1985-12-05
CA1225550A (en) 1987-08-18
BR8502567A (en) 1986-02-04
KR900000299B1 (en) 1990-01-25
ES292492U (en) 1986-06-01
ES292492Y (en) 1987-02-16
MX162647A (en) 1991-06-10
SU1389685A3 (en) 1988-04-15
ATE33043T1 (en) 1988-04-15
CS385585A2 (en) 1990-08-14
KR850007985A (en) 1985-12-11
CS273605B2 (en) 1991-03-12

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