EP2134480B1 - Method for cleaning a rolling mill roll and corresponding device - Google Patents

Method for cleaning a rolling mill roll and corresponding device Download PDF

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Publication number
EP2134480B1
EP2134480B1 EP07871988A EP07871988A EP2134480B1 EP 2134480 B1 EP2134480 B1 EP 2134480B1 EP 07871988 A EP07871988 A EP 07871988A EP 07871988 A EP07871988 A EP 07871988A EP 2134480 B1 EP2134480 B1 EP 2134480B1
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EP
European Patent Office
Prior art keywords
cleaning
zone
cleaned
roll
nozzle
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EP07871988A
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German (de)
French (fr)
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EP2134480A1 (en
Inventor
Thomas Cacciatore
Ludovic Verzier
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Clecim SAS
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Siemens VAI Metals Technologies SAS
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Priority to PL07871988T priority Critical patent/PL2134480T3/en
Publication of EP2134480A1 publication Critical patent/EP2134480A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B28/00—Maintaining rolls or rolling equipment in effective condition
    • B21B28/02—Maintaining rolls in effective condition, e.g. reconditioning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B28/00—Maintaining rolls or rolling equipment in effective condition
    • B21B28/02—Maintaining rolls in effective condition, e.g. reconditioning
    • B21B28/04—Maintaining rolls in effective condition, e.g. reconditioning while in use, e.g. polishing or grinding while the rolls are in their stands

Definitions

  • the present invention relates to the cleaning of rolling mill rolls, in particular skin-pass rolling mills, used at the outlet of continuous galvanizing lines, by high-pressure jet.
  • a skin-pass mill comprises a pair of support rollers on which a pair of work rolls are supported between which a galvanized strip is laminated.
  • these particles can print on the coating of the strip with each rotation of the rolls and can sufficiently alter the surface quality so that the product becomes unsellable or needs to be decommissioned.
  • JP 9262607 in which mechanized cleaning means of the rolls are used by pressurized spraying of detergent fluids.
  • these devices use low-pressure, wide-jet spray nozzles which, if they are effective enough to degrease lubricant coatings due to the detergent effect of the pulverized liquid, are not, however, effective enough to remove particles adherents, especially zinc particles.
  • the patent EP 0 995 504 discloses a cleaning device comprising moving lances, able to move along the cylinder, that is to say parallel to its axis of rotation. This arrangement imposes a perfect adaptation of the speed of movement of the lance to the speed of rotation of the cylinder according to the impact width of the jet.
  • the present invention proposes a solution that makes it possible to optimize the use of spraying devices in order to reduce the consumption of fluids - and thus the discharges - and to avoid wasted time.
  • the invention relates to a method of cleaning a roll of a rolling mill, comprising a cleaning step in which a nozzle operates in the cleaning regime while being moved parallel to the axis of the cylinder according to a cleaning speed.
  • the method is essentially characterized in that it further comprises a determination step in which is determined, on the cylinder, at least one working zone delimited by a starting position of work and a position of end of work, and in that the cleaning step is limited to the work area.
  • a metal strip 1 to be rolled passes between the working rolls 2a, 2b of a skin-pass mill.
  • These working cylinders are themselves supported by support cylinders 3A, 3B.
  • the device according to the invention comprises a cleaning nozzle 61 mounted on a lance and configured to pressurize a cleaning product to the cylinder to be cleaned.
  • At least one nozzle is provided for cleaning at least one cylinder, so that a nozzle can clean several cylinders and several nozzles clean a single cylinder.
  • Each lance is equipped with at least one nozzle, in this case a single nozzle.
  • At least one lance 6a ensures the cleaning of the upper working cylinder 2a
  • at least one other lance 6b ensures cleaning the lower working cylinder 2b.
  • At least one cylinder (or each cylinder) can be cleaned by a plurality of lances, in this case two.
  • the invention aims to clean primarily at least one of the working rolls.
  • the lances 6a, 6b for cleaning at least one of the working cylinders comprise a spraying nozzle 61, and a body 62 supplied with cleaning product, in this case a fluid under pressure by a flexible pipe 63.
  • the body 62 is supported by an axial adjustment device 64 itself carried by means for moving the nozzle, in this case a translation device 65.
  • FIGS. Figures 2A and 2B An example of an axial adjustment device 64 is illustrated in FIGS. Figures 2A and 2B in which the translation and rotation movements are shown schematically by solid arrows.
  • the axial adjustment device 64 comprises a support 641 pivotally mounted on the slide 652 of the translation device 65 in order to allow adjustment of the angle of inclination ⁇ of the lance 6a, 6b with respect to the cylinder 2a, 2b.
  • the pivoting of the support 641 relative to the slide 652 can be motorized, for example with a servomotor. It is then possible in this embodiment to use only two swivel lances, each respectively cleaning a working cylinder 2 and a support cylinder 3.
  • a first control member 643 ensures the adaptation to the diameter of the cylinders.
  • the slide 652 can be moved with a belt system as shown in FIG. Figure 2A , or chain, or with a ball screw.
  • the drive is advantageously provided by a servomotor.
  • the slide 652 is a carriage guided on a crossbar 651 by rollers.
  • the translation device 65 comprises the cross member 651 fixed on the chassis of the skin-pass mill and the slide 652 capable of moving parallel to the longitudinal axis of the cylinder 2a, 2b under the action of a second control member 653 fit to ensure the displacement of the axial adjustment device 64 carrying the lance 6a, 6b parallel to the axis of the working cylinder 2a, 2b.
  • first control member 643 and the second control member 653 are the same.
  • the nozzle is moved in translation, possibly back and forth, parallel to the axis of rotation of the cylinder to be cleaned, according to a first speed.
  • the first speed is slaved to at least one of the following parameters: diameter of the cylinder to be cleaned, rotational speed of said cylinder, and impact width of the jet emitted by the nozzle on said cylinder.
  • This control of the speed during the cleaning phase is for example implemented by the control member 653.
  • the control member 643 of the axial adjustment 64 positions the nozzle 61 at the required distance from the surface 21 of the working roll 2a, 2b.
  • the control member 643 for adjusting the position of the nozzle with respect to the surface of the cylinder can be actuated by a hydraulic or pneumatic cylinder, can also be equipped with a position detector or, alternatively, by a servomotor driving a wheel mechanism and worm, rack or belt.
  • the control member 653 of the translating device 65 moves the nozzle 61 at the required and controlled speed along the surface 21 of the working roll 2a, 2b so as to to ensure, over the cylinder turns, an optimal recovery of the impact of the cleaning jet, so that the entire surface to be cleaned thereof is covered.
  • the invention furthermore comprises means for determining at least one working zone delimited by a start of work position and an end of work position on the cylinder to be cleaned, and means for limiting the cleaning step to said zone. working.
  • a cylinder may comprise a plurality of work areas.
  • the means for determining at least one working area are optical means configured to obtain at least one image of the rolls and / or the web.
  • Each work area may include a recovery area R.
  • the optical means comprise at least one camera 8a, 8b, 8c, 8d of which the image is transmitted to a control screen present in a control cabin of the rolling mill.
  • An operator can then appreciate the transmitted images and determine the start and end positions for each work area.
  • the determination of the work areas is implemented automatically by a surface defect detection system 10a, 10b ( figure 4 ).
  • An illuminating device 101 illuminates the coated strip 1 at the exit of the skin-pass rolling mill.
  • a high-definition CCD camera 102 captures the image of the moving tape.
  • Such devices are known, for example in the patent application EP 0 974 833 .
  • the image acquired by the CCD camera 102 is transmitted to a filter unit 103 whose function is to eliminate the distortions due to vignetting and nonuniformity of illumination.
  • the filtered images are then processed in an image processing unit 104 of edge-detection or gray-scale type which makes it possible to highlight the more contrasted zones considered as "suspect zones", that is to say probably containing particles to clean.
  • the cleanliness of the cylinder is determined by a step of measuring the profile of the surface of said cylinder.
  • the device comprises means for determining at least one zone to be cleaned, said means for determining at least one zone to be cleaned comprising means for measuring the surface profile of said cylinder by triangulation by a sheet or a laser beam, the adhesions of foreign bodies (zinc particles, lubricating products, etc.) being measured as variations of the measured profile.
  • a laser line is projected on the surface of the cylinder to be cleaned.
  • a return optic reproduces the reflected light of this laser line on the matrix of a camera, in this case CMOS. From the camera image, a controller calculates not only the distance information (z-axis), but also the actual position along the laser line (x-axis), and outputs both results in a two-dimensional coordinate system.
  • a 3D representation is obtained by moving the laser sensor along the cylinder.
  • a beam or laser rib triangulation sensor may be mounted on the lance support 62. It scans the surface of the rotating cylinder by high speed displacement of the slide 652 on the slideways 651 and delivers position information of the fouled areas to the slide rails 651. clean with reference to the displacement encoder of the slide 652.
  • the beam size is, for example, from 1 to 150 mm, and preferably from 10 to 100 mm.
  • the device according to the invention further comprises air blowing means, in this case a compressed air blowing nozzle cooperating with said means for determining at least one zone to be cleaned, in order to dry the surface. of the cylinder to be analyzed.
  • air blowing means in this case a compressed air blowing nozzle cooperating with said means for determining at least one zone to be cleaned, in order to dry the surface. of the cylinder to be analyzed.
  • a lid serves to protect the triangulation window during the cleaning steps.
  • the visual or automatic detection of defects makes it possible to define the limits of a working zone 20, 21 or an area to be cleaned 10, 11, 12.
  • a work zone includes an area to be cleaned possibly increased by one or two areas of recovery R.
  • a cleaning nozzle is first positioned in a rest position A.
  • the nozzle In a transport step, the nozzle is moved parallel to the axis of the cylinder from an end-of-work position, and / or to a starting position of work.
  • the cleaning step can, thanks to the invention, be limited to this work zone.
  • the limitation is implemented by a transport step during which the nozzle operates in a regime different from the cleaning regime, and is moved parallel to the axis of the cylinder from an end of work position, and / or until 'to a work start position.
  • the nozzle operates in a regime different from the cleaning regime.
  • the operating speed is characterized by at least one of the following parameters: speed of movement, flow delivered by the nozzle, and pressure of the cleaning fluid at the outlet of the nozzle.
  • the displacement of the nozzle outside said working zone is carried out at a second speed, referred to as the transport speed, different from the first speed, referred to as the cleaning speed.
  • the transport speed different from the first speed, referred to as the cleaning speed.
  • the second speed is not slaved to the speed of rotation of the cylinder, and preferably maximum depending on the means for moving the nozzle.
  • the flow rate that is to say the amount of cleaning product delivered by the nozzle per unit of time, is different from the cleaning flow, in this case lower, delivered during the cleaning step.
  • the cleaning product is applied to the cylinder to be cleaned under a second pressure different from the first (cleaning pressure), in this case less than zero pressure. (cutting off the cleaning agent supply).
  • control member 653 of the axial adjustment device 65 positions the nozzle 61 at maximum speed along the surface 21 of the working cylinder 2a, 2b in order to start and stop cleaning exactly where it is needed.
  • the lance 6 moves at maximum speed from its rest position A to the cleaning start position B of a dried emulsion deposit 9a corresponding to an edge of the cylinder table and then provides the speed-controlled cleaning of cleaning B to C, will then be positioned at maximum speed at the beginning D of the second dried emulsion deposit 9b and then cleaning at controlled cleaning speed D to E and finally returns to maximum speed at the rest position A.
  • the recovery R adjusts the work area.
  • the lance 6 goes at maximum speed from its rest position A to the work start position I and then cleans at a controlled cleaning speed from I to J in order to clean the zinc particles adhered by the band 1, then returns at maximum speed at its home position A.
  • the work area 22 includes a first upstream zone, covering, extending from the work start position I to the zone start position of the zone to be cleaned K, and a second zone, downstream, covering extending from the end of zone position of the zone to be cleaned L to the end of work position J.
  • a control unit 105 determines the beginnings and ends of areas to be cleaned by possibly adding within a working area a covering R to the contours of the suspect zones as soon as they appear and delivers to the actuators 653 the displacement commands (cleaning regime in a different work area and regime outside the work area).
  • control unit 105 delivers to the actuators 653 displacement commands (cleaning regime in a work zone and a different speed outside the work zone) making it possible to ensure depending on the case, the cleaning of the full width of a cylinder or the only width corresponding to that of the contact with the increased band of one or more covers R or the only end portions of the cylinders which are not in contact with the band increased overlaps R ( Figures 3A, 3B , 3C ).
  • the triggering of the cleaning operation can be performed automatically or manually.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Cleaning In General (AREA)

Description

La présente invention concerne le nettoyage des cylindres de laminoirs, en particulier de laminoirs skin-pass, mis en oeuvre en sortie des lignes continues de galvanisation, par jet à haute pression.The present invention relates to the cleaning of rolling mill rolls, in particular skin-pass rolling mills, used at the outlet of continuous galvanizing lines, by high-pressure jet.

Un laminoir skin-pass comprend une paire de cylindres d'appui sur lesquels s'appuient une paire de cylindres de travail entre lesquels est laminée une bande galvanisée.A skin-pass mill comprises a pair of support rollers on which a pair of work rolls are supported between which a galvanized strip is laminated.

Lors de leur passage entre les cylindres de travail, certaines particules de zinc provenant de la surface des bandes galvanisées peuvent se coller sur les cylindres de travail qui peuvent également les transférer sur les cylindres d'appui.As they pass between the work rolls, certain zinc particles from the surface of the galvanized strips can stick to the work rolls which can also transfer them to the support rolls.

En conséquence, ces particules peuvent s'imprimer sur le revêtement de la bande à chaque rotation des cylindres et peuvent altérer suffisamment la qualité de surface pour que le produit devienne invendable ou nécessite d'être déclassé.As a result, these particles can print on the coating of the strip with each rotation of the rolls and can sufficiently alter the surface quality so that the product becomes unsellable or needs to be decommissioned.

En outre, sur certains laminoirs skin-pass, on a besoin d'assurer la lubrification de l'entrefer des cylindres de travail avec une émulsion d'eau et de lubrifiant afin de diminuer les efforts pour des tractions et allongements donnés. Il en résulte généralement un dépôt gras sur les cylindres de travail dans les zones qui ne sont pas en contact avec la bande.In addition, on certain skin-pass mills, it is necessary to ensure the lubrication of the air gap of the working rolls with an emulsion of water and lubricant in order to reduce the forces for given pulls and elongations. This generally results in a greasy deposit on the work rolls in areas that are not in contact with the band.

Et lors d'un changement de produit à laminer ayant une largeur de bande plus grande, ce dépôt gras peut se révéler néfaste sur les deux bords de la nouvelle bande et conduire à un défaut d'apparence visuelle de celle-ci.And when a product to be rolled having a larger bandwidth, this greasy deposit can be detrimental to both edges of the new band and lead to a lack of visual appearance of it.

Pour palier ces inconvénients, il est connu le document JP 9262607 dans lequel sont mis en oeuvre des moyens de nettoyage mécanisés des cylindres par pulvérisation sous pression de fluides détergents. Toutefois, ces dispositifs font appel à des buses de pulvérisation à basse pression et à jet large qui, s'ils se montrent assez efficaces pour dégraisser les enductions de produit de lubrification grâce à l'effet détergent du liquide pulvérisé ne sont toutefois pas assez efficaces pour éliminer les particules adhérentes, notamment les particules de zinc.To overcome these disadvantages, the document is known JP 9262607 in which mechanized cleaning means of the rolls are used by pressurized spraying of detergent fluids. However, these devices use low-pressure, wide-jet spray nozzles which, if they are effective enough to degrease lubricant coatings due to the detergent effect of the pulverized liquid, are not, however, effective enough to remove particles adherents, especially zinc particles.

D'autres types de buses de pulvérisation à jet étroit et à haute énergie sont connus. De telles buses nécessitent d'une part d'ajuster avec précision la distance entre la buse et le cylindre à nettoyer, donc de s'adapter aux diamètres des différents cylindres de travail utilisés, et d'autre part pour avoir un recouvrement de l'impact des jets tout au long du cylindre il convient soit de mettre en oeuvre un nombre important des buses de pulvérisation, déraisonnable en termes de coût et de complexité mécanique, soit de mettre en oeuvre une buse montée sur une lance mobile.Other types of narrow-jet and high-energy spray nozzles are known. Such nozzles require on the one hand to precisely adjust the distance between the nozzle and the cylinder to be cleaned, so to adapt to the diameters of the different working cylinders used, and secondly to have a recovery of the impact of the jets throughout the cylinder should be implemented by a large number of spray nozzles, unreasonable in terms of cost and mechanical complexity, or to implement a nozzle mounted on a mobile lance.

Le brevet EP 0 995 504 décrit un dispositif de nettoyage comprenant des lances mobiles, capables de se déplacer le long du cylindre, c'est-à-dire parallèlement à son axe de rotation. Cette disposition impose une parfaite adaptation de la vitesse de déplacement de la lance à la vitesse de rotation du cylindre en fonction de la largeur d'impact du jet.The patent EP 0 995 504 discloses a cleaning device comprising moving lances, able to move along the cylinder, that is to say parallel to its axis of rotation. This arrangement imposes a perfect adaptation of the speed of movement of the lance to the speed of rotation of the cylinder according to the impact width of the jet.

Toutefois, compte tenu de la relativement faible dimension de l'impact du jet, il est nécessaire d'avoir une vitesse de déplacement relativement lente de la ou des lances de nettoyage afin de garantir un bon recouvrement de l'impact du jet.However, given the relatively small size of the impact of the jet, it is necessary to have a relatively slow speed of movement of the cleaning lance or lances to ensure a good recovery of the impact of the jet.

Une telle solution est donc consommatrice en temps et en produits de nettoyages.Such a solution is therefore consuming time and cleaning products.

La présente invention propose une solution permettant d'optimiser l'utilisation des dispositifs de pulvérisation afin de réduire les consommations de fluides - donc les rejets - et d'éviter les pertes de temps.The present invention proposes a solution that makes it possible to optimize the use of spraying devices in order to reduce the consumption of fluids - and thus the discharges - and to avoid wasted time.

Avec cet objectif en vue, selon un premier de ses objets, l'invention concerne un procédé de nettoyage d'un cylindre de laminoir, comprenant une étape de nettoyage lors de laquelle une buse fonctionne en régime de nettoyage tout en étant déplacée parallèlement à l'axe du cylindre selon une vitesse de nettoyage.With this object in view, according to a first of its objects, the invention relates to a method of cleaning a roll of a rolling mill, comprising a cleaning step in which a nozzle operates in the cleaning regime while being moved parallel to the axis of the cylinder according to a cleaning speed.

Selon l'invention, le procédé est essentiellement caractérisé en ce qu'il comprend en outre une étape de détermination lors de laquelle est déterminée, sur le cylindre, au moins une zone de travail délimitée par une position de début de travail et une position de fin de travail, et en ce que l'étape de nettoyage est limitée à la zone de travail.According to the invention, the method is essentially characterized in that it further comprises a determination step in which is determined, on the cylinder, at least one working zone delimited by a starting position of work and a position of end of work, and in that the cleaning step is limited to the work area.

Selon un autre de ses objets, l'invention concerne également un dispositif de nettoyage d'au moins un cylindre de laminoir, susceptible de mettre en oeuvre le procédé selon l'invention. Le dispositif comprend :

  • une buse de nettoyage configurée pour appliquer sous pression un produit de nettoyage au cylindre à nettoyer, et
  • des moyens pour déplacer la buse.
According to another of its objects, the invention also relates to a device for cleaning at least one rolling mill roll, capable of implementing the method according to the invention. The device comprises:
  • a cleaning nozzle configured to pressurize a cleaning product to the cylinder to be cleaned, and
  • means for moving the nozzle.

Selon l'invention, le dispositif est essentiellement caractérisé en ce qu'il comprend en outre :

  • des moyens pour déterminer au moins une zone de travail délimitée par une position de début de travail et une position de fin de travail, et
  • des moyens pour limiter l'étape de nettoyage à la zone de travail,
  • les moyens pour déterminer au moins une zone de travail sur le cylindre à nettoyer comprennent des moyens optiques pour acquérir une image de la surface du produit laminé, et des moyens de traitement de l'image obtenue et/ou
des moyens pour déterminer au moins une zone à nettoyer, lesdits moyens pour déterminer au moins une zone à nettoyer comprenant des moyens de mesure du profil de surface dudit cylindre par triangulation par nappe ou faisceau laser.According to the invention, the device is essentially characterized in that it further comprises:
  • means for determining at least one work area delimited by a work start position and an end work position, and
  • means for limiting the cleaning step to the work area,
  • the means for determining at least one working zone on the cylinder to be cleaned comprise optical means for acquiring an image of the surface of the rolled product, and means for processing the image obtained and / or
means for determining at least one zone to be cleaned, said means for determining at least one zone to be cleaned comprising means for measuring the surface profile of said cylinder by triangulation by a sheet or a laser beam.

Grâce à l'invention, il est inutile de déplacer la ou les lances tout au long de la génératrice du cylindre à nettoyer, le nettoyage peut être sélectif, en sélectionnant une ou plusieurs zones de travail.Thanks to the invention, it is unnecessary to move the lances or all along the generatrix of the cylinder to clean, cleaning can be selective, by selecting one or more work areas.

D'autres caractéristiques et avantages de la présente invention apparaîtront plus clairement à la lecture de la description suivante donnée à titre d'exemple illustratif et non limitatif et faite en référence aux figures annexées dans lesquelles :

  • la figure 1 illustre une coupe transversale d'un mode de réalisation du dispositif selon l'invention,
  • la figure 2a illustre un mode de réalisation d'un dispositif de réglage axial selon l'invention,
  • la figure 2b illustre une coupe selon l'axe XX de la figure 2A,
  • la figure 3A illustre les positions de travail et de repos pour une lance et deux zones de travail,
  • la figure 3B illustre les positions de travail et de repos pour deux lances et deux zones de travail,
  • la figure 3C illustre les positions de travail et de repos pour une lance et une zone de travail, et
  • la figure 4 illustre un autre mode de réalisation du dispositif selon l'invention.
Other characteristics and advantages of the present invention will emerge more clearly on reading the following description given by way of illustrative and nonlimiting example and with reference to the appended figures in which:
  • the figure 1 illustrates a cross section of an embodiment of the device according to the invention,
  • the figure 2a illustrates an embodiment of an axial adjustment device according to the invention,
  • the figure 2b illustrates a section along the XX axis of the Figure 2A ,
  • the figure 3A illustrates the work and rest positions for a spear and two work areas,
  • the figure 3B illustrates the working and rest positions for two lances and two work areas,
  • the figure 3C illustrates the work and rest positions for a spear and a work area, and
  • the figure 4 illustrates another embodiment of the device according to the invention.

En référence à la figure 1, une bande métallique 1 à laminer passe entre les cylindres de travail 2a, 2b d'un laminoir skin-pass. Ces cylindres de travail sont eux-mêmes soutenus par des cylindres d'appui 3A, 3B.With reference to the figure 1 a metal strip 1 to be rolled passes between the working rolls 2a, 2b of a skin-pass mill. These working cylinders are themselves supported by support cylinders 3A, 3B.

Le dispositif selon l'invention comprend une buse 61 de nettoyage montée sur une lance et configurée pour appliquer sous pression un produit de nettoyage au cylindre à nettoyer.The device according to the invention comprises a cleaning nozzle 61 mounted on a lance and configured to pressurize a cleaning product to the cylinder to be cleaned.

Au moins une buse est prévue pour nettoyer au moins un cylindre, de sorte qu'une buse peut nettoyer plusieurs cylindres et plusieurs buses nettoyer un seul cylindre.At least one nozzle is provided for cleaning at least one cylinder, so that a nozzle can clean several cylinders and several nozzles clean a single cylinder.

Chaque lance est équipée d'au moins une buse, en l'espèce une seule buse respective.Each lance is equipped with at least one nozzle, in this case a single nozzle.

Ainsi, dans un mode de réalisation (figure 1, figure 3A), au moins une lance 6a assure le nettoyage du cylindre de travail supérieur 2a, et au moins une autre lance 6b assure le nettoyage du cylindre de travail inférieur 2b. Pour certaines applications, on peut prévoir au moins une lance 7a pour assurer le nettoyage du cylindre d'appui supérieur 3A, et de même, on peut prévoir au moins une autre lance 7b pour assurer le nettoyage du cylindre d'appui inférieur 3B.Thus, in one embodiment ( figure 1 , figure 3A ), at least one lance 6a ensures the cleaning of the upper working cylinder 2a, and at least one other lance 6b ensures cleaning the lower working cylinder 2b. For certain applications, it is possible to provide at least one lance 7a for cleaning the upper support cylinder 3A, and likewise at least one other lance 7b can be provided to clean the lower support cylinder 3B.

Dans un autre mode de réalisation (figure 3B), au moins un cylindre (ou chaque cylindre) peut être nettoyé par une pluralité de lances, en l'espèce deux.In another embodiment ( figure 3B ), at least one cylinder (or each cylinder) can be cleaned by a plurality of lances, in this case two.

L'invention vise à nettoyer à titre principal au moins l'un des cylindres de travail.The invention aims to clean primarily at least one of the working rolls.

Les lances 6a, 6b destinées au nettoyage d'au moins l'un des cylindres de travail comprennent une buse de pulvérisation 61, et un corps 62 alimenté en produit de nettoyage, en l'espèce un fluide sous pression par une tuyauterie flexible 63. Le corps 62 est supporté par un dispositif de réglage axial 64 lui même porté par des moyens pour déplacer la buse, en l'espèce un dispositif de translation 65.The lances 6a, 6b for cleaning at least one of the working cylinders comprise a spraying nozzle 61, and a body 62 supplied with cleaning product, in this case a fluid under pressure by a flexible pipe 63. The body 62 is supported by an axial adjustment device 64 itself carried by means for moving the nozzle, in this case a translation device 65.

Un exemple de dispositif de réglage axial 64 est illustré aux figures 2A et 2B dans lesquelles les mouvements de translation et de rotation sont schématisés par des flèches pleines.An example of an axial adjustment device 64 is illustrated in FIGS. Figures 2A and 2B in which the translation and rotation movements are shown schematically by solid arrows.

Le dispositif de réglage axial 64 comprend un support 641 monté pivotant sur le coulisseau 652 du dispositif de translation 65 afin de permettre le réglage de l'angle d'inclinaison α de la lance 6a, 6b par rapport au cylindre 2a, 2b.The axial adjustment device 64 comprises a support 641 pivotally mounted on the slide 652 of the translation device 65 in order to allow adjustment of the angle of inclination α of the lance 6a, 6b with respect to the cylinder 2a, 2b.

Le pivotement du support 641 par rapport au coulisseau 652 peut être motorisé, par exemple avec un servomoteur. Il est alors possible dans ce mode de réalisation de n'utiliser que deux lances pivotantes, chacune assurant respectivement le nettoyage d'un cylindre de travail 2 puis d'un cylindre d'appui 3. Un premier organe de commande 643 assure l'adaptation au diamètre des cylindres.The pivoting of the support 641 relative to the slide 652 can be motorized, for example with a servomotor. It is then possible in this embodiment to use only two swivel lances, each respectively cleaning a working cylinder 2 and a support cylinder 3. A first control member 643 ensures the adaptation to the diameter of the cylinders.

Sur le support 641 est monté un autre coulisseau 642 capable de se déplacer parallèlement à l'axe de la lance 6a, 6b sous l'action du premier organe de commande 643 apte à régler la position relative de la buse 61 à la distance requise de la surface 21 du cylindre de travail 2a, 2b.On the support 641 is mounted another slide 642 capable of moving parallel to the axis of the lance 6a, 6b under the action of the first control member 643 able to adjust the relative position of the nozzle 61 to the required distance from the surface 21 of the working cylinder 2a, 2b.

Le déplacement du coulisseau 652 peut être réalisé avec un système à courroie comme illustré en figure 2A, ou à chaîne, ou encore avec une vis à bille. L'entrainement est avantageusement assuré par un servomoteur. Le coulisseau 652 est un chariot guidé sur une traverse 651 par des galets.The slide 652 can be moved with a belt system as shown in FIG. Figure 2A , or chain, or with a ball screw. The drive is advantageously provided by a servomotor. The slide 652 is a carriage guided on a crossbar 651 by rollers.

Le dispositif de translation 65 comprend la traverse 651 fixée sur le châssis du laminoir skin-pass et du coulisseau 652 capable de se déplacer parallèlement à l'axe longitudinal du cylindre 2a, 2b sous l'action d'un deuxième organe de commande 653 apte à assurer le déplacement du dispositif de réglage axial 64 portant la lance 6a, 6b parallèlement à l'axe du cylindre de travail 2a, 2b.The translation device 65 comprises the cross member 651 fixed on the chassis of the skin-pass mill and the slide 652 capable of moving parallel to the longitudinal axis of the cylinder 2a, 2b under the action of a second control member 653 fit to ensure the displacement of the axial adjustment device 64 carrying the lance 6a, 6b parallel to the axis of the working cylinder 2a, 2b.

Dans un mode de réalisation non représenté, le premier organe de commande 643 et le deuxième organe de commande 653 sont les mêmes.In an embodiment not shown, the first control member 643 and the second control member 653 are the same.

De préférence, la buse est mise en mouvement de translation, éventuellement de va-et-vient, parallèle à l'axe de rotation du cylindre à nettoyer, selon une première vitesse.Preferably, the nozzle is moved in translation, possibly back and forth, parallel to the axis of rotation of the cylinder to be cleaned, according to a first speed.

De manière connue en soi, la première vitesse est asservie à l'un au moins des paramètres suivants : diamètre du cylindre à nettoyer, vitesse de rotation dudit cylindre, et largeur d'impact du jet émis par la buse sur ledit cylindre. Ce contrôle de la vitesse en phase de nettoyage est par exemple mis en oeuvre par l'organe de commande 653.In a manner known per se, the first speed is slaved to at least one of the following parameters: diameter of the cylinder to be cleaned, rotational speed of said cylinder, and impact width of the jet emitted by the nozzle on said cylinder. This control of the speed during the cleaning phase is for example implemented by the control member 653.

En fonction du diamètre connu du cylindre de travail et de l'inclinaison α (figure 1) de la lance 6a, 6b par rapport au cylindre 2a, 2b, l'organe de commande 643 du dispositif de réglage axial 64 positionne la buse 61 à la distance requise de la surface 21 du cylindre de travail 2a, 2b.As a function of the known diameter of the working roll and the inclination α ( figure 1 ) of the lance 6a, 6b with respect to the cylinder 2a, 2b, the control member 643 of the axial adjustment 64 positions the nozzle 61 at the required distance from the surface 21 of the working roll 2a, 2b.

L'organe de commande 643 permettant le réglage de la position de la buse par rapport à la surface du cylindre peut être actionné par un vérin hydraulique ou pneumatique, peut également être équipé d'un détecteur de position ou, à titre d'alternative, par un servomoteur entrainant un mécanisme à roue et vis sans fin, à crémaillère, ou encore à courroie.The control member 643 for adjusting the position of the nozzle with respect to the surface of the cylinder can be actuated by a hydraulic or pneumatic cylinder, can also be equipped with a position detector or, alternatively, by a servomotor driving a wheel mechanism and worm, rack or belt.

En fonction de la vitesse de rotation du cylindre de travail 2a, 2b, l'organe de commande 653 du dispositif de translation 65 déplace la buse 61 à la vitesse requise et contrôlée le long de la surface 21 du cylindre de travail 2a, 2b afin de garantir, au fil des tours de cylindre, un recouvrement optimal de l'impact du jet de nettoyage, de sorte à ce que la totalité de la surface à nettoyer de celui-ci soit couverte.As a function of the speed of rotation of the work roll 2a, 2b, the control member 653 of the translating device 65 moves the nozzle 61 at the required and controlled speed along the surface 21 of the working roll 2a, 2b so as to to ensure, over the cylinder turns, an optimal recovery of the impact of the cleaning jet, so that the entire surface to be cleaned thereof is covered.

On détermine ainsi un régime de nettoyage, ou régime de travail, dans lequel la buse est déplacée à une vitesse de nettoyage donnée, et projette un fluide de nettoyage à une pression de nettoyage donnée et un débit de nettoyage donné.This determines a cleaning regime, or working regime, in which the nozzle is moved at a given cleaning speed, and projects a cleaning fluid at a given cleaning pressure and a given cleaning rate.

L'invention comprend en outre des moyens pour déterminer au moins une zone de travail délimitée par une position de début de travail et une position de fin de travail sur le cylindre à nettoyer, et des moyens pour limiter l'étape de nettoyage à ladite zone de travail.The invention furthermore comprises means for determining at least one working zone delimited by a start of work position and an end of work position on the cylinder to be cleaned, and means for limiting the cleaning step to said zone. working.

Selon l'invention, un cylindre peut comprendre une pluralité de zones de travail.According to the invention, a cylinder may comprise a plurality of work areas.

Les moyens pour déterminer au moins une zone de travail sont des moyens optiques configurés pour obtenir au moins une image des cylindres et / ou de la bande.The means for determining at least one working area are optical means configured to obtain at least one image of the rolls and / or the web.

Chaque zone de travail peut comprendre une zone de recouvrement R.Each work area may include a recovery area R.

Dans un mode de réalisation, figure 1, les moyens optiques comprennent au moins une caméra 8a, 8b, 8c, 8d dont l'image est transmise à un écran de contrôle présent dans une cabine de pilotage du laminoir.In one embodiment, figure 1 , the optical means comprise at least one camera 8a, 8b, 8c, 8d of which the image is transmitted to a control screen present in a control cabin of the rolling mill.

Un opérateur peut alors apprécier les images transmises et déterminer les positions de début et de fin de travail pour chaque zone de travail.An operator can then appreciate the transmitted images and determine the start and end positions for each work area.

Dans un autre mode de réalisation, la détermination des zones de travail est mise en oeuvre automatiquement par un système de détection de défauts de surface 10a, 10b (figure 4) .In another embodiment, the determination of the work areas is implemented automatically by a surface defect detection system 10a, 10b ( figure 4 ).

Un dispositif illuminateur 101 éclaire la bande revêtue 1 en sortie du laminoir skin-pass. Une caméra CCD 102 à haute définition capte l'image de la bande en défilement. De tels dispositifs sont connus, par exemple dans la demande de brevet EP 0 974 833 .An illuminating device 101 illuminates the coated strip 1 at the exit of the skin-pass rolling mill. A high-definition CCD camera 102 captures the image of the moving tape. Such devices are known, for example in the patent application EP 0 974 833 .

L'image acquise par la caméra CCD 102 est transmise à une unité de filtrage 103 dont la fonction est d'éliminer les distorsions dues au vignettage et à la non uniformité d'éclairement.The image acquired by the CCD camera 102 is transmitted to a filter unit 103 whose function is to eliminate the distortions due to vignetting and nonuniformity of illumination.

Les images filtrées sont ensuite traitées dans une unité de traitement d'image 104 de type à détection de contours ou à niveaux de gris qui permet de mettre en évidence les zones plus contrastées considérées comme « zones suspectes », c'est-à-dire contenant probablement des particules à nettoyer.The filtered images are then processed in an image processing unit 104 of edge-detection or gray-scale type which makes it possible to highlight the more contrasted zones considered as "suspect zones", that is to say probably containing particles to clean.

Avantageusement selon l'invention, il n'est pas obligatoire de mettre en oeuvre de modèles sophistiqués d'analyse morphologiques en vue de discriminer différentes formes de défauts.Advantageously according to the invention, it is not mandatory to implement sophisticated models of morphological analysis to discriminate different forms of defects.

Dans un autre mode de réalisation, alternatif ou combinable, et non représenté, la propreté du cylindre est déterminée par une étape de mesure du profil de la surface dudit cylindre.In another embodiment, alternative or combinable, and not shown, the cleanliness of the cylinder is determined by a step of measuring the profile of the surface of said cylinder.

A cet effet, le dispositif selon l'invention comprend des moyens pour déterminer au moins une zone à nettoyer, lesdits moyens pour déterminer au moins une zone à nettoyer comprenant des moyens de mesure du profil de surface dudit cylindre par triangulation par nappe ou faisceau laser, les adhésions de corps étrangers (particules de zinc, produits de lubrification...) étant mesurées comme des variations du profil mesuré.For this purpose, the device according to the invention comprises means for determining at least one zone to be cleaned, said means for determining at least one zone to be cleaned comprising means for measuring the surface profile of said cylinder by triangulation by a sheet or a laser beam, the adhesions of foreign bodies (zinc particles, lubricating products, etc.) being measured as variations of the measured profile.

On citera comme référence commerciale le produit scanCONTROL 2800 de la société MICRO EPSILON pour la mesure du profil de surface.As a commercial reference, the product scanCONTROL 2800 from the company MICRO EPSILON for the measurement of the surface profile.

Une ligne laser est projetée sur la surface du cylindre à nettoyer. Une optique de retour reproduit la lumière réfléchie de cette ligne laser sur la matrice d'une caméra, en l'espèce CMOS. A partir de l'image caméra, un contrôleur calcule non seulement les informations de distance (axe z), mais aussi la position réelle le long de la ligne laser (axe x), et sort les deux résultats dans un système de coordonnées bidimensionnel.A laser line is projected on the surface of the cylinder to be cleaned. A return optic reproduces the reflected light of this laser line on the matrix of a camera, in this case CMOS. From the camera image, a controller calculates not only the distance information (z-axis), but also the actual position along the laser line (x-axis), and outputs both results in a two-dimensional coordinate system.

Une représentation en 3D est obtenue par le déplacement du capteur laser le long du cylindre.A 3D representation is obtained by moving the laser sensor along the cylinder.

Un capteur à triangulation par faisceau ou par nappe laser peut être monté sur le support de lance 62. Il balaye la surface du cylindre en rotation par déplacement à grande vitesse du coulisseau 652 sur les glissières 651 et délivre des informations de position des zones encrassés à nettoyer en référence avec le codeur de déplacement du coulisseau 652.A beam or laser rib triangulation sensor may be mounted on the lance support 62. It scans the surface of the rotating cylinder by high speed displacement of the slide 652 on the slideways 651 and delivers position information of the fouled areas to the slide rails 651. clean with reference to the displacement encoder of the slide 652.

La taille du faisceau est par exemple de 1 à 150 mm, et de préférence entre 10 et 100 mm.The beam size is, for example, from 1 to 150 mm, and preferably from 10 to 100 mm.

Avantageusement, le dispositif selon l'invention comprend en outre des moyens de soufflage d'air, en l'espèce un buse de soufflage d'air comprimé, coopérant avec lesdits moyens pour déterminer au moins une zone à nettoyer, afin de sécher la surface du cylindre à analyser.Advantageously, the device according to the invention further comprises air blowing means, in this case a compressed air blowing nozzle cooperating with said means for determining at least one zone to be cleaned, in order to dry the surface. of the cylinder to be analyzed.

Avantageusement, un opercule permet de protéger la fenêtre de triangulation pendant les étapes de nettoyage.Advantageously, a lid serves to protect the triangulation window during the cleaning steps.

La détection visuelle ou automatique de défauts permet de définir les limites d'une zone de travail 20, 21 ou d'une zone à nettoyer 10, 11, 12.The visual or automatic detection of defects makes it possible to define the limits of a working zone 20, 21 or an area to be cleaned 10, 11, 12.

Une zone de travail 20, 21, 22 comprend une position de début de travail, en l'espèce

  • B et D sur la figure 3A,
  • B et B' sur la figure 3B, et
  • I sur la figure 3C,
et une position de fin de travail, en l'espèce et respectivement
  • C et E sur la figure 3A,
  • C et C' sur la figure 3B, et
  • J sur la figure 3C.
A work area 20, 21, 22 includes a work start position, in this case
  • B and D on the figure 3A ,
  • B and B 'on the figure 3B , and
  • I on the figure 3C ,
and an end-of-work position, in this case and respectively
  • C and E on the figure 3A ,
  • C and C 'on the figure 3B , and
  • J on the figure 3C .

Une zone de travail comprend une zone à nettoyer éventuellement augmentée d'une ou deux zones de recouvrement R.A work zone includes an area to be cleaned possibly increased by one or two areas of recovery R.

Une zone à nettoyer 10, 11 (zone hachurée figures 3A, 3B, 3C) est délimitée par une position de début de zone à nettoyer, en l'espèce

  • B et G sur la figure 3A,
  • B et B' sur la figure 3B, et
  • K figure 3C,
et une position de fin de zone à nettoyer, en l'espèce et respectivement
  • F et E sur la figure 3A,
  • F et F' sur la figure 3B, et
  • L figure 3C.
An area to be cleaned 10, 11 (hatched area Figures 3A, 3B , 3C ) is bounded by a starting position of area to be cleaned, in this case
  • B and G on the figure 3A ,
  • B and B 'on the figure 3B , and
  • K figure 3C ,
and an end-of-zone position to be cleaned, in this case and respectively
  • F and E on the figure 3A ,
  • F and F 'on the figure 3B , and
  • The figure 3C .

Par exemple :

  • La position A représente une position de repos pour une première lance 6 (figures 3A, 3B, 3C), et la position A' représente une position de repos pour une deuxième lance 6' (figure 3B).
  • La figure 3A illustre un mode de réalisation dans lequel l'étape de nettoyage est mis en oeuvre par une seule lance 6. Un cylindre 2 comprend une première zone à nettoyer 10 et une deuxième zone à nettoyer 11. Dans cet exemple, les zones à nettoyer correspondent aux extrémités du cylindre 2 qui ne sont pas en contact avec la bande laminée 1, et on définit, respectivement aux zones à nettoyer, une première zone de travail 20 et une deuxième zone de travail 21 dont chaque comprend une zone de recouvrement R, en l'espèce de même dimension.
  • La figure 3B illustre une variante de la figure 3A dans laquelle les mêmes zones sont à nettoyer et les mêmes zones de travail sont définies, mais le nettoyage est mis en oeuvre respectivement par une première lance 6 et une deuxième lance 6'. Les position A', B', C' sont les symétriques des positions A, B, C de la figure 3B pour la deuxième lance 6'. Dans un mode de réalisation non représenté, les positions de repos A et A' peuvent être situées du même côté du cylindre 2.
  • La figure 3C illustre un mode de réalisation dans lequel l'étape de nettoyage est mis en oeuvre par une seule lance 6. Un cylindre 2 comprend une zone à nettoyer 12 correspondant à la surface de la bande laminée 1. On définit une zone de travail 22 comprenant en l'espèce une première et une deuxième zone de recouvrement R, situées à chaque extrémité de la largeur de la bande laminée 1.
For example :
  • Position A represents a rest position for a first lance 6 ( Figures 3A, 3B , 3C ), and the position A 'represents a rest position for a second lance 6' ( figure 3B ).
  • The figure 3A illustrates an embodiment in which the cleaning step is carried out by a single launches 6. A cylinder 2 comprises a first area to be cleaned 10 and a second area to be cleaned 11. In this example, the areas to be cleaned correspond to the ends of the cylinder 2 which are not in contact with the rolled strip 1, and are defined respectively to the areas to be cleaned, a first work zone 20 and a second work zone 21 each of which comprises a recovery zone R, in this case of the same dimension.
  • The figure 3B illustrates a variant of the figure 3A in which the same areas are to be cleaned and the same working areas are defined, but the cleaning is implemented respectively by a first lance 6 and a second lance 6 '. The positions A ', B', C 'are the symmetrical positions A, B, C of the figure 3B for the second spear 6 '. In an embodiment not shown, the rest positions A and A 'can be located on the same side of the cylinder 2.
  • The figure 3C illustrates an embodiment in which the cleaning step is carried out by a single lance 6. A cylinder 2 comprises a zone to be cleaned 12 corresponding to the surface of the laminated strip 1. A working zone 22 is defined comprising a first and a second overlap area R at each end of the width of the rolled strip 1.

Pour illustrer une mise en oeuvre, typiquement, on positionne au préalable une buse de nettoyage dans une position de repos A.To illustrate an implementation, typically, a cleaning nozzle is first positioned in a rest position A.

Dans une étape de transport, la buse est déplacée parallèlement à l'axe du cylindre à partir d'une position de fin de travail, et/ou jusqu'à une position de début de travail.In a transport step, the nozzle is moved parallel to the axis of the cylinder from an end-of-work position, and / or to a starting position of work.

En l'espèce :

  • jusqu'à une position de début de travail, c'est-à-dire depuis la position de repos A jusqu'à la position B (figures 3A, 3B),
  • depuis une position de fin de travail d'une autre zone de travail, c'est-à-dire depuis la position C jusqu'à la position D, figure 3A,
  • et/ou jusqu'à la position de repos, c'est-à-dire depuis une position de fin de travail d'une zone de travail, par exemple depuis la position E jusqu'à la position A (figure 3A), ou depuis la position C jusqu'à la position A (figure 3B), et depuis la position C' jusqu'à la position A' (figure 3B), et depuis la position J (figure 3C) jusqu'à la position A.
In this case :
  • to a starting work position, that is from rest position A to position B ( Figures 3A, 3B )
  • from an end of work position of another work area, ie from position C to position D, figure 3A ,
  • and / or to the rest position, that is to say from an end-of-work position of a work zone, for example from the position E to the position A ( figure 3A ), or from position C to position A ( figure 3B ), and from position C 'to position A' ( figure 3B ), and from position J ( figure 3C ) to position A.

Une fois la zone de travail déterminée, l'étape de nettoyage peut, grâce à l'invention, être limitée à cette zone de travail.Once the work area has been determined, the cleaning step can, thanks to the invention, be limited to this work zone.

La limitation est mise en oeuvre grâce à une étape de transport pendant laquelle la buse fonctionne en régime différent du régime de nettoyage, et est déplacée parallèlement à l'axe du cylindre à partir d'une position de fin de travail, et/ou jusqu'à une position de début de travail.The limitation is implemented by a transport step during which the nozzle operates in a regime different from the cleaning regime, and is moved parallel to the axis of the cylinder from an end of work position, and / or until 'to a work start position.

Dans cette étape de transport, la buse fonctionne en régime différent du régime de nettoyage.In this transport step, the nozzle operates in a regime different from the cleaning regime.

Le régime de fonctionnement est caractérisé par au moins l'un des paramètres suivants : vitesse de déplacement, débit fourni par la buse, et pression du fluide de nettoyage en sortie de la buse.The operating speed is characterized by at least one of the following parameters: speed of movement, flow delivered by the nozzle, and pressure of the cleaning fluid at the outlet of the nozzle.

Dans un mode de réalisation, lors de l'étape de transport, le déplacement de la buse hors de ladite zone de travail est effectué à une deuxième vitesse, dite vitesse de transport, différente de la première vitesse, dite vitesse de nettoyage, en l'espèce supérieure.In one embodiment, during the transporting step, the displacement of the nozzle outside said working zone is carried out at a second speed, referred to as the transport speed, different from the first speed, referred to as the cleaning speed. superior species.

Avantageusement, la deuxième vitesse est non asservie à la vitesse de rotation du cylindre, et de préférence maximale en fonction des moyens pour déplacer la buse.Advantageously, the second speed is not slaved to the speed of rotation of the cylinder, and preferably maximum depending on the means for moving the nozzle.

Dans un mode de réalisation, lors de l'étape de transport, le débit, c'est-à-dire la quantité de produit de nettoyage délivrée par la buse par unité de temps, est différent du débit de nettoyage, en l'espèce inférieur, délivré lors de l'étape de nettoyage.In one embodiment, during the transport step, the flow rate, that is to say the amount of cleaning product delivered by the nozzle per unit of time, is different from the cleaning flow, in this case lower, delivered during the cleaning step.

Dans un mode de réalisation, pendant l'étape de transport de la buse, le produit de nettoyage est appliqué au cylindre à nettoyer sous une deuxième pression différente de la première (pression de nettoyage), en l'espèce inférieure voire à une pression nulle (coupure de l'alimentation en produit de nettoyage).In one embodiment, during the step of transporting the nozzle, the cleaning product is applied to the cylinder to be cleaned under a second pressure different from the first (cleaning pressure), in this case less than zero pressure. (cutting off the cleaning agent supply).

Par exemple, en fonction de la largeur connue de la bande 1, l'organe de commande 653 du dispositif de réglage axial 65 positionne à vitesse maximale la buse 61 le long de la surface 21 du cylindre de travail 2a, 2b afin de faire débuter et s'arrêter le nettoyage exactement là où celui-ci est nécessaire.For example, as a function of the known width of the strip 1, the control member 653 of the axial adjustment device 65 positions the nozzle 61 at maximum speed along the surface 21 of the working cylinder 2a, 2b in order to start and stop cleaning exactly where it is needed.

Dans l'exemple de la figure 3A, la lance 6 passe à vitesse maximum de sa position de repos A à la position de début de nettoyage B d'un dépôt d'émulsion séchée 9a correspondant à un bord de la table du cylindre puis assure le nettoyage à vitesse contrôlée de nettoyage de B à C, va ensuite se positionner à vitesse maximum au début D du second dépôt d'émulsion séchée 9b puis assure le nettoyage à vitesse de nettoyage contrôlée de D à E et retourne enfin à vitesse maximum à la position de repos A. Le recouvrement R permet d'ajuster la zone de travail.In the example of the figure 3A , the lance 6 moves at maximum speed from its rest position A to the cleaning start position B of a dried emulsion deposit 9a corresponding to an edge of the cylinder table and then provides the speed-controlled cleaning of cleaning B to C, will then be positioned at maximum speed at the beginning D of the second dried emulsion deposit 9b and then cleaning at controlled cleaning speed D to E and finally returns to maximum speed at the rest position A. The recovery R adjusts the work area.

Dans l'exemple de la figure 3B, on dispose de deux lances 6, 6' qui vont chacune aller à vitesse maximale de leur position de repos A, A' aux positions respectives de début de travail B, B' de dépôts d'émulsion séchée 9a, 9b puis assurent le nettoyage à vitesse contrôlée de B et B' à C et C' respectivement et retournent à vitesse maximale à leur position de repos respective A, A'.In the example of the figure 3B , there are two lances 6, 6 'which will each go at maximum speed from their rest position A, A' at the respective working start positions B, B 'of dried emulsion deposits 9a, 9b then provide controlled speed cleaning of B and B 'to C and C' respectively and return at maximum speed to their respective rest position A, A '.

Dans l'exemple de la figure 3C, la lance 6 va à vitesse maximale de sa position de repos A à la position de début de travail I puis assure le nettoyage à vitesse de nettoyage contrôlée de I à J afin de nettoyer les particules de zinc collées par la bande 1, puis retourne à vitesse maximale à sa position de repos A. Dans cet exemple, la zone de travail 22 comprend une première zone, amont, de recouvrement s'étendant depuis la position de début de travail I jusqu'à la position de début de zone de la zone à nettoyer K, et une deuxième zone, aval, de recouvrement s'étendant depuis la position de fin de zone de la zone à nettoyer L jusqu'à la position de fin de travail J.In the example of the figure 3C , the lance 6 goes at maximum speed from its rest position A to the work start position I and then cleans at a controlled cleaning speed from I to J in order to clean the zinc particles adhered by the band 1, then returns at maximum speed at its home position A. In this example, the work area 22 includes a first upstream zone, covering, extending from the work start position I to the zone start position of the zone to be cleaned K, and a second zone, downstream, covering extending from the end of zone position of the zone to be cleaned L to the end of work position J.

Une unité de commande 105 détermine les débuts et fins de zones à nettoyer en ajoutant éventuellement au sein d'une zone de travail un recouvrement R aux contours des zones suspectes dès leur apparition et délivre aux actionneurs 653 les commandes de déplacement (régime de nettoyage dans une zone de travail et régime différent hors zone de travail).A control unit 105 determines the beginnings and ends of areas to be cleaned by possibly adding within a working area a covering R to the contours of the suspect zones as soon as they appear and delivers to the actuators 653 the displacement commands (cleaning regime in a different work area and regime outside the work area).

A titre d'alternative, l'unité de commande 105, dès l'apparition de zones suspectes, délivre aux actionneurs 653 des commandes de déplacement (régime de nettoyage dans une zone de travail et régime différent hors zone de travail) permettant d'assurer, suivant les cas, le nettoyage de la largeur complète d'un cylindre ou de la seule largeur correspondant à celle du contact avec la bande augmentée d'un ou des recouvrements R ou encore des seules parties extrêmes des cylindres qui ne sont pas en contact avec la bande augmentées des recouvrements R (figures 3A, 3B, 3C).As an alternative, the control unit 105, as soon as suspect zones appear, delivers to the actuators 653 displacement commands (cleaning regime in a work zone and a different speed outside the work zone) making it possible to ensure depending on the case, the cleaning of the full width of a cylinder or the only width corresponding to that of the contact with the increased band of one or more covers R or the only end portions of the cylinders which are not in contact with the band increased overlaps R ( Figures 3A, 3B , 3C ).

Le déclenchement de l'opération de nettoyage peut être réalisé automatiquement ou manuellement.The triggering of the cleaning operation can be performed automatically or manually.

L'invention n'est pas limitée aux modes de réalisation précédemment décrits. D'autres variantes sont possibles, par exemple :

  • Dans un mode de réalisation, figure 1, des lances 7a, 7b peuvent être utilisées afin de nettoyer aussi les cylindres d'appui. Dans ce cas, elles peuvent être fixées au même coulisseau 652 que les lances 6a, 6b. Bien qu'on change moins souvent les cylindres d'appui 3A, 3B que les cylindres de travail 2a, 2b et que l'ajustement de la distance entre la buse 71 et la surface 31 du cylindre ne le nécessite pas obligatoirement, les lances 7a, 7b peuvent également disposer de leur propre dispositif de réglage axial.
  • Dans un mode de réalisation (figure 1), pour certaines applications, le dispositif comprend en outre des rampes de pulvérisation d'émulsion lubrifiante 4a, 4b pour assurer la lubrification de l'entrefer 5.
  • Dans un autre mode de réalisation non représenté, une caméra CCD peut être installée solidaire de chaque corps de lance 62. Chaque caméra acquière des images de la surface des cylindres (de travail et d'appui si le support 641 est monté pivotant sur le coulisseau 652 de manière motorisée, comme vu précédemment) pendant les phases de laminage où les étapes de nettoyage né sont pas mises en oeuvre. Ces images sont traitées de manière classique (Système d'Inspection Automatique de Surface ) et les variations de contraste identifiées, après traitement, comme étant des salissures commandent la mise en action des lances de nettoyage. Un diaphragme protège avantageusement l'objectif des caméras pendant le nettoyage.
The invention is not limited to the previously described embodiments. Other variants are possible, for example:
  • In one embodiment, figure 1 , lances 7a, 7b can be used to also clean the support rolls. In this case, they can be attached to the same slide 652 as the lances 6a, 6b. Although the bearing rolls 3A, 3B are changed less frequently than the working rolls 2a, 2b and the adjustment of the distance between the nozzle 71 and the surface 31 of the roll does not necessarily require it, the lances 7a , 7b may also have their own axial adjustment device.
  • In one embodiment ( figure 1 ), for certain applications, the device further comprises lubricating emulsion spray bars 4a, 4b for lubricating the gap 5.
  • In another embodiment not shown, a CCD camera can be installed integral with each lance body 62. Each camera acquires images of the surface of the rolls (working and support if the support 641 is pivotally mounted on the slider 652 motorized manner, as seen above) during the rolling stages where the cleaning steps born are not implemented. These images are processed in a conventional manner (Automatic Surface Inspection System) and the contrast variations identified after treatment, as being soils, control the activation of the cleaning lances. A diaphragm advantageously protects the camera lens during cleaning.

Claims (18)

  1. Method for cleaning a roll (2, 3) of a rolling mill, comprising a cleaning step in which a nozzle is operated in cleaning mode while being moved parallel to the axis of the roll at a cleaning speed,
    characterised in that it also includes a determination step in which at least one working zone (20, 21, 22) delimited by a work start position (B, B', D, I) and a work end position (C, C', E, J) is determined on the roll (2, 3), and in that the cleaning step is limited to the cleaning zone (20, 21, 22).
  2. Cleaning method according to claim 1, characterised in that it includes a transport step during which the nozzle, being operated in a mode other than the cleaning mode, is moved in parallel to the axis of the roll (2, 3) from a work end position (C, C', E, J), and/or to a work start position (B, B', D, I).
  3. Cleaning method according to claim 2, characterised in that, during the transport step, the nozzle is moved from a work end position (C) of a first working zone (20) to a work start position (D) of a second working zone (21).
  4. Cleaning method according to one of claims 2 to 3, characterised in that, during the transport step, the flow rate of the cleaning product applied by the nozzle is less than the cleaning flow rate.
  5. Cleaning method according to one of claims 2 to 4, characterised in that, during the transport step, the pressure of the cleaning product applied by the nozzle is less than the cleaning pressure.
  6. Cleaning method according to one of claims 2 to 5, characterised in that, during the transport step, the transport speed is greater than the cleaning speed.
  7. Cleaning method according to one of claims 1 to 6, characterised in that the working zone (20, 21, 22) includes a zone to be cleaned (10, 11, 12) delimited by a start position of the zone to be cleaned (B, B', G, K) and an end position of the zone to be cleaned (F, E, F', L).
  8. Cleaning method according to claim 7, characterised in that the working zone (21, 22) also includes a first overlap zone (R) extending from the work start position (D, I) to the start position of the zone to be cleaned (G, K).
  9. Cleaning method according to claim 7 or 8, characterised in that the working zone (20, 21, 22) also includes a second overlap zone (R) extending from the work end position (F, F', L) of the zone to be cleaned (10, 11, 12) to the work end position (C, C', J).
  10. Cleaning method according to one of claims 1 to 9, characterised in that the working zone (20, 21, 22) is predetermined as a function of the width of the rolled strip (1) .
  11. Cleaning method according to claim 10, dependent on one of claims 7 to 9, characterised in that the zone to be cleaned (12) is delimited by the two edges (K, L) of the rolled strip (1) .
  12. Cleaning method according to claim 10, dependent on one of claims 7 to 9, characterised in that the zone to be cleaned (10, 11) is delimited firstly by an edge of the roll (B, B', E) and, secondly, by the edge (F, F', G) of the rolled strip (1) closest to this edge of the roll.
  13. Cleaning method according to one of claims 1 to 12, characterised in that the working zone is determined by optical control of the cleanliness of the roll and/or the cleanliness of the rolled strip.
  14. Cleaning method according to claim 13, in which the cleanliness of the roll is determined by a step in which the profile of the surface of said roll is measured.
  15. Device for cleaning at least one rolling-mill roll that is able to implement the method according to any of the above claims, the device comprising:
    - a cleaning nozzle (61) designed to apply a pressurised cleaning fluid to the roll (2, 3) to be cleaned, and
    - means (641, 642, 652) for moving the nozzle, characterised in that it also includes:
    - means for determining at least one working zone delimited by a work start position and a work end position, and
    - means for limiting the cleaning step to the working zone,
    - the means for determining at least one working zone on the roll to be cleaned include optical means (102) for capturing an image of the surface of the rolled product, and means (103, 104) for processing the image obtained
    and/or
    means for determining at least one zone to be cleaned, said means for determining at least one zone to be cleaned comprising means for measuring the profile of the surface of said roll by laser-beam or laser-sheet triangulation.
  16. Device according to claim 15, in which the means for moving the nozzle are designed to move the nozzle at a first speed in the working zone, and at a second speed different to the first speed outside said working zone.
  17. Device according to either one of claims 15 or 16, also including a second cleaning nozzle (71) designed to clean said roll to be cleaned or another roll of the rolling mill.
  18. Device according to claim 17, also including air-blowing means cooperating with said means for determining at least one zone to be cleaned.
EP07871988A 2007-04-18 2007-12-20 Method for cleaning a rolling mill roll and corresponding device Active EP2134480B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL07871988T PL2134480T3 (en) 2007-04-18 2007-12-20 Method for cleaning a rolling mill roll and corresponding device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0702813A FR2915118B1 (en) 2007-04-18 2007-04-18 METHOD FOR CLEANING ROLLER CYLINDER AND DEVICE THEREFOR
PCT/FR2007/052577 WO2008129141A1 (en) 2007-04-18 2007-12-20 Method for cleaning a rolling mill roll and corresponding device

Publications (2)

Publication Number Publication Date
EP2134480A1 EP2134480A1 (en) 2009-12-23
EP2134480B1 true EP2134480B1 (en) 2013-03-06

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ID=38445706

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EP07871988A Active EP2134480B1 (en) 2007-04-18 2007-12-20 Method for cleaning a rolling mill roll and corresponding device

Country Status (9)

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EP (1) EP2134480B1 (en)
KR (1) KR101115134B1 (en)
CN (1) CN101646507B (en)
BR (1) BRPI0721581A2 (en)
DK (1) DK2134480T3 (en)
ES (1) ES2410087T3 (en)
FR (1) FR2915118B1 (en)
PL (1) PL2134480T3 (en)
WO (1) WO2008129141A1 (en)

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Publication number Priority date Publication date Assignee Title
DE102010033753A1 (en) * 2010-06-04 2011-12-08 Sms Siemag Ag Device for cleaning and drying rolling stands
CN103170504B (en) * 2013-03-01 2016-03-30 柳燕明 Air cushion without friction roll cleaner for rolling mill and air cushion without friction milling train clear roller method
CN103680928B (en) * 2013-12-24 2015-12-02 天威保变（秦皇岛）变压器有限公司 A kind of pretreating process of internal coil diameter fiber core
WO2018050920A1 (en) 2016-09-19 2018-03-22 Sms Group Gmbh Roll treatment during operation
CN111451283B (en) * 2020-03-19 2021-08-03 武汉钢铁有限公司 Intelligent centralized control method and system for roll surface scraper

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6297705A (en) * 1985-10-22 1987-05-07 Nippon Kokan Kk <Nkk> Device for detecting and removing defect of rolling roll
US5460023A (en) * 1991-09-13 1995-10-24 International Rolling Mill Consultants Inc. Roll surface restoration system and method
KR100381586B1 (en) * 1998-05-01 2003-04-26 더블유.엘. 고어 앤드 어소시에이트스, 인코포레이티드 Repeatably positionable nozzle assembly
FR2781570B1 (en) * 1998-07-21 2000-08-25 Lorraine Laminage DEVICE FOR DETECTING SURFACE DEFECTS OF THREADED METAL STRIPS
DE19848174A1 (en) * 1998-10-20 2000-05-04 Bwg Bergwerk Walzwerk Method and device for cleaning rolls and / or rolls in strip casting plants, rolling mills and / or strip processing lines, in particular skin pass mills or the like
DE50104137D1 (en) * 2000-08-22 2004-11-18 Linde Ag METHOD AND DEVICE FOR REMOVING METAL IMPURITIES
EP1304174A1 (en) * 2001-10-19 2003-04-23 Aluminium Norf GmbH Method for reconditioning rolls
KR20040034896A (en) * 2002-10-17 2004-04-29 주식회사 포스코 Vacuum cleaning apparatus and method for surface of roll with position and time control function

Also Published As

Publication number Publication date
EP2134480A1 (en) 2009-12-23
PL2134480T3 (en) 2013-08-30
KR20090122996A (en) 2009-12-01
DK2134480T3 (en) 2013-04-29
FR2915118B1 (en) 2009-06-05
FR2915118A1 (en) 2008-10-24
ES2410087T3 (en) 2013-06-28
KR101115134B1 (en) 2012-03-05
CN101646507A (en) 2010-02-10
BRPI0721581A2 (en) 2014-02-25
WO2008129141A1 (en) 2008-10-30
CN101646507B (en) 2012-03-21

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