EP2303482B1 - Method for changing a roller in a roll mill for a continuously running steel strip - Google Patents

Method for changing a roller in a roll mill for a continuously running steel strip Download PDF

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Publication number
EP2303482B1
EP2303482B1 EP08874694.6A EP08874694A EP2303482B1 EP 2303482 B1 EP2303482 B1 EP 2303482B1 EP 08874694 A EP08874694 A EP 08874694A EP 2303482 B1 EP2303482 B1 EP 2303482B1
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EP
European Patent Office
Prior art keywords
stand
cage
dedicated
rolling
roller
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Revoked
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EP08874694.6A
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German (de)
French (fr)
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EP2303482A1 (en
Inventor
Vincent Cronier
Bernard Rossigneux
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Clecim SAS
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Siemens VAI Metals Technologies SAS
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/08—Interchanging rolls, roll mountings, or stand frames, e.g. using C-hooks; Replacing roll chocks on roll shafts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B2013/003—Inactive rolling stands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/14—Reduction rate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2271/00—Mill stand parameters
    • B21B2271/02—Roll gap, screw-down position, draft position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/58—Roll-force control; Roll-gap control
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49718—Repairing
    • Y10T29/49721—Repairing with disassembling
    • Y10T29/4973—Replacing of defective part

Definitions

  • the present invention relates to a method of changing a roll in a cold rolling mill for a continuous-running steel strip according to the preamble of claim 1, see for example JP-A62275515 .
  • the invention relates to the technical field of cold rolling steel strips on a continuous tandem type rolling mill, requiring changes in the rolling rolls.
  • the permanent contact of the working rolls with the rolled strip and with the support or intermediate rolls causes a deterioration of their surface state requiring their change as soon as this surface condition, particularly on the last stand of rolling downstream of the rolling mill (output rolling mill), no longer achieves the required surface quality of the rolled strip.
  • the drop in productivity due to cylinder changes is particularly important for rolling mill stands equipped with very small cylinders whose work hardening and surface wear are very fast, for example multi-cylinder cages used for rolling stainless steels.
  • the rolling scheme that is to say for a given product and a target output thickness (involving the reduction rate in each cage, the rotational speed of the cylinders in each cage, the traction between each cage ) must be modified for six cages twelve times throughout the change procedure in order to distribute on each of the cages upstream and downstream of the change site a portion of the unrealized thickness reduction in the cage being changed.
  • An object of the present invention is to provide a method of changing a roll (s) of a rolling stand adapted to support at least one working roll for a continuous strip steel strip rolling mill, said method for solving the aforementioned problems.
  • a solution is proposed by a method through claim 1.
  • the rolling mill comprises a number of cages one of which is permanently in free tightening function (said dedicated cage).
  • the dedicated cage according to the invention is to replace the cage for which at least one cylinder must be changed.
  • the time sequence of increasing and then decreasing the cage clamps according to the transferred / redistributed setpoint values can therefore be greatly simplified and reduced, which makes the strip thickness at the outlet of the rolling mill better controllable within the required tolerances, as well as guarantees an excellent upgrade.
  • the invention allows a change of cylinders free of any break tape.
  • the productivity of the mill remains at a maximum, as in the non-change cylinder phase.
  • a set of subclaims also has advantages of the invention according to different aspects or embodiments.
  • the strip B is constantly rolled by passing through N-1 rolling mills on a total number of N cages that includes the rolling mill, any one of the mill stands being in the process of cylinder change (and thus designated by the cage C) is in the waiting position of a new change operation (and thus designated by the cage CA or C).
  • the method under a first embodiment has two variants, respectively represented by the FIGS. 1a, 1b and 2a, 2b .
  • the last set value R5 on the fifth cylinder C5 allows the strip to have a thickness E at the output of the rolling mill.
  • the method can therefore be applied without temporal limitation, if desired, simply by reassigning the waiting function (free rolling) of the dedicated cage on one of the cages where it has occurred. a change of cylinder, thus waiting for a next cage change.
  • the last set value R5 on the sixth cylinder C6 allows the strip to have a thickness E at the output of the rolling mill.
  • the first and the second cage C1, C2 retain their clamping position below their respective setpoints R1, R2.
  • it is then also possible to assign to this fifth cage the waiting function of the dedicated cage CA C3 (now active rolling function), until a change of another cylinder / cage C must intervene.
  • the method can therefore be applied without time limit, if desired, simply by reassigning the waiting function (rolling free) of the dedicated cage to one of the cages where a change of cylinder has taken place, thus waiting for a next cage change.
  • Figure 3a, 3b and 3c describe a second embodiment of the invention.
  • the cage CA is dedicated to allow a change of cylinders of all other cages located upstream. It is only put into service when any roll stand is in the process of changing rolls and only for the duration of this change. Except for cylinder change operations, this dedicated cage is in the waiting position (free of rolling function).
  • this dedicated cage CA is placed downstream of the last active rolling stand which is the one whose cylinders are most often changed.
  • the figure 3c so is a classic return to the figure 3a .

Description

La présente invention concerne une méthode de changement de cylindre dans un laminoir à froid pour une bande d'acier en défilement continu selon le préambule de la revendication 1, voir par exemple JP-A62275515 . L'invention se rapporte au domaine technique du laminage à froid des bandes d'acier sur un laminoir continu de type tandem, nécessitant des changements des cylindres de laminage.The present invention relates to a method of changing a roll in a cold rolling mill for a continuous-running steel strip according to the preamble of claim 1, see for example JP-A62275515 . The invention relates to the technical field of cold rolling steel strips on a continuous tandem type rolling mill, requiring changes in the rolling rolls.

Le laminage à froid de bandes d'acier peut être réalisé sur différents types d'installations de laminage :

  • Les installations de laminage dites « réversibles » dans lesquelles la bande à laminer défile, alternativement dans une direction de défilement puis dans l'autre entre au moins deux organes aptes à assurer indifféremment le déroulage et le ré enroulage de la bande au cours des différentes passes de laminage. Entre ces organes de déroulage / enroulage la bande est laminée dans une seule cage de laminage qui confère à l'installation une capacité de 200 000 à 600 000 t/an ou dans deux cages successives qui portent la capacité de production à 300 000 / 1 000 000 t/an.
  • Les installations de laminage dites « en tandem » dans lesquelles la bande à laminer défile suivant une seule direction de défilement dans une pluralité de cages de laminage disposées successivement les unes derrière les autres et situées entre un organe de déroulage amont et un organe de ré-enroulage aval suivant la direction de défilement. Lesdites cages de laminage comprenant, de manière connue, des montants supportant les cylindres de laminage dits « cylindres de travail », des cylindres de soutien limitant la flexion des cylindres de travail et, dans certains cas, une ou deux paires de cylindres intermédiaires entre cylindres de soutien et cylindres de travail. Des applications spéciales destinées au laminage des aciers les plus durs mettent aussi en oeuvre des montages à cylindres multiples comme, par exemple, les laminoirs dits « Sendzimir ». Il existe plusieurs types de laminoirs à froid de type tandem : les laminoirs conventionnels fonctionnant bobine par bobine et capables d'une production de 700 000 à 1 500 000 tonnes d'acier laminé par an, leur coût d'investissement est élevé et ils présentent l'inconvénient de nécessiter l'engagement de la tête de chaque bobine à travers toute l'installation. D'autres laminoirs en tandem sont organisés afin de fonctionner en régime continu, la queue d'une bobine sortant de l'organe de déroulage étant soudée à la tête d'une nouvelle bobine déroulée par un second organe de déroulage. De tels laminoirs continus atteignent des productions de 1 000 000 à 3 000 000 t/an.
Cold rolling of steel strips can be carried out on different types of rolling mills:
  • The so-called "reversible" rolling installations in which the strip rolls, alternately in a direction of travel and then in the other between at least two members able to ensure indifferently unwinding and re-rolling of the strip during the different passes rolling. Between these unwinding / winding members the strip is rolled in a single rolling stand which gives the plant a capacity of 200 000 to 600 000 t / year or in two successive cages which bring the production capacity to 300 000/1. 000 000 t / year.
  • The so-called "tandem" rolling installations in which the strip to be rolled passes in a single direction of travel in a plurality of rolling stands successively arranged one behind the other and situated between an upstream peel member and a control member. downstream winding in the direction of scrolling. Said rolling cages comprising, in known manner, the amounts supporting the rolling rolls known as "working rolls", support rolls limiting the bending of the work rolls and, in certain cases, one or two pairs of intermediate cylinders between support cylinders and work rolls. Special applications for the rolling of the hardest steels also implement multiple cylinder arrangements such as, for example, so-called "Sendzimir" rolling mills. There are several types of tandem-type cold rolling mills: conventional rolling mills that are reel-to-reel and capable of producing 700,000 to 1,500,000 tonnes of rolled steel per year, have a high investment cost and exhibit the disadvantage of requiring the engagement of the head of each coil throughout the installation. Other tandem rolling mills are organized in order to operate continuously, the tail of a coil emerging from the unwinding member being welded to the head of a new coil unwound by a second unwinding member. Such continuous rolling mills reach productions of 1,000,000 to 3,000,000 t / year.

Compte tenu des investissements consentis pour assurer la continuité des opérations de laminage, il est nécessaire d'éliminer au maximum les temps morts pendant lesquels le laminoir ne lamine pas, de même qu'il est nécessaire de réduire le plus possible une mise au mille, c'est-à-dire la quantité de bande laminée hors des tolérances requises.In view of the investments made to ensure the continuity of the rolling operations, it is necessary to eliminate as much as possible the dead times during which the rolling mill does not roll, just as it is necessary to reduce as much as possible a filling, i.e., the amount of rolled strip out of the required tolerances.

Or, pour diverses raisons comme la maintenance, il est régulièrement nécessaire de changer les cylindres des cages de laminage, en particulier les cylindres de travail et intermédiaires ou les cassettes de cylindres multiples et le laminage doit être interrompu durant toute la durée de cette opération.
En effet, lors du laminage, les cylindres sont soumis à de fortes pressions qui produisent un écrouissage progressif de leur surface qui, lorsqu'il devient trop important, fragilise le cylindre qui peut alors présenter des fissures ou des écaillages.However, for various reasons such as maintenance, it is regularly necessary to change the rolls of the rolling stands, in particular the working and intermediate rolls or the multiple roll cassettes and the rolling must be interrupted throughout the duration of this operation.
Indeed, during rolling, the rolls are subjected to high pressures which produce a progressive hardening of their surface which, when it becomes too large, weakens the cylinder which can then have cracks or chips.

D'autre part, le contact permanent des cylindres de travail avec la bande laminée et avec les cylindres d'appui ou intermédiaires entraine une dégradation de leur état de surface nécessitant leur changement dès lors que cet état de surface, particulièrement sur la dernière cage de laminage en aval du laminoir (sortie de laminoir), ne permet plus d'atteindre la qualité de surface requise de la bande laminée.On the other hand, the permanent contact of the working rolls with the rolled strip and with the support or intermediate rolls causes a deterioration of their surface state requiring their change as soon as this surface condition, particularly on the last stand of rolling downstream of the rolling mill (output rolling mill), no longer achieves the required surface quality of the rolled strip.

Enfin, en fonction du programme de laminage, il est usuel de pouvoir changer le diamètre des cylindres de travail ou la configuration d'au moins une cage de laminage, par exemple d'un mode « quarto » à « sexto » ou multicylindres. Il est alors nécessaire de procéder au changement physique des cylindres concernés.Finally, depending on the rolling program, it is customary to be able to change the diameter of the working rolls or the configuration of at least one roll stand, for example from a "quarto" to "sexto" or multi-roll mode. It is then necessary to proceed with the physical change of the cylinders concerned.

Afin de simplifier et raccourcir au maximum les opérations de changement de cylindres, on a depuis longtemps mis au point des équipements et procédures automatisées de changement comme ceux décrits dans WO 2007 060370 . Les durées de changement varient, suivant les installations de 2 à 3 minutes.In order to simplify and shorten cylinder change operations as much as possible, automated equipment and procedures for change such as those described in WO 2007 060370 . The times of change vary, depending on the installations of 2 to 3 minutes.

La baisse de productivité due aux changements de cylindres est particulièrement importante pour les cages de laminoirs équipées de très petits cylindres dont l'écrouissage et l'usure de surface sont très rapides, par exemple les cages multicylindres utilisées pour le laminage des aciers inoxydables.The drop in productivity due to cylinder changes is particularly important for rolling mill stands equipped with very small cylinders whose work hardening and surface wear are very fast, for example multi-cylinder cages used for rolling stainless steels.

Si le cas d'un laminoir tandem à quatre cages destiné à laminer 50 000 bobines (environ 1 000 000 de tonnes) par an d'aciers inoxydables est considéré, il est nécessaire d'arrêter le laminoir afin de changer les cylindres de la dernière cage environ toutes les 1 à 3 bobines. Un changement de cylindre très rapide durant au moins 2 minutes, il résulte que, même si changement - moins fréquent - des cylindres d'autres cages est fait « en temps masqué » durant les changements de ceux de la dernière cage en aval, le temps de changement annuel peut atteindre 1700 heures / an soit un taux d'arrêt de 24% pour une activité de 300 jours / an, 24h / 24h. Au mieux, ce taux peut descendre à 8% avec des changements toutes les trois bobines, ce qui reste encore très important.If the case of a tandem mill with four cages intended to roll 50 000 coils (about 1 000 000 tons) per year of stainless steels is considered, it is necessary to stop the rolling mill in order to change the cylinders of the last cage about every 1 to 3 reels. A very fast change of cylinder for at least 2 minutes, it follows that, even if change - less frequent - the cylinders of other cages is made "in masked time" during the changes of those of the last cage downstream, the time of annual change can reach 1700 hours / year or a stop rate of 24% for an activity of 300 days / year, 24h / 24h. At best, this rate can go down to 8% with changes every three reels, which is still very important.

D'autre part, au redémarrage du laminoir (arrêt de défilement de bande), des conditions optimales de laminage ne sont pas atteintes immédiatement et le laminage de bande est hors des tolérances acceptables sur environ 50 à 75 mètres de bande, ce qui grève la mise au mille.On the other hand, at the restart of the rolling mill (tape run stop), optimal rolling conditions are not reached immediately and the strip rolling is out of acceptable tolerances on about 50 to 75 meters of tape, which strike the put to the mile.

Des tentatives ont été faites afin de réaliser des changements de cylindres sans interrompre le laminage. Une méthode adaptée à un laminoir tandem à 6 cages est par exemple décrite dans JP 62-275515 . Cette méthode de changement de cylindres d'une cage de laminage est adaptée à supporter au moins un cylindre de travail pour un laminoir de bande d'acier en défilement continu, ladite cage faisant part d'une pluralité de cages de laminage placées successivement le long du laminoir suivant une direction du défilement continu. Lorsqu'un changement de cylindre est envisagé sur une cage quelconque (selon un exemple décrit en figure 2 dudit document), son arrêt est préparé en répartissant son taux de réduction (pourcentage de réduction d'épaisseur du produit laminé) sur les cages en amont et en aval selon une séquence temporelle suivante :

  • Augmentation de réduction des cages (en amont de la cage concernée par le changement) d'une fraction de celle nécessaire pour compenser l'ouverture de la cage concernée par le changement, en suivant la séquence première cage du laminoir tandem, puis deuxième cage, etc.
  • Diminution de réduction dans la cage concernée par le changement en ne conservant qu'une faible valeur résiduelle.
  • Augmentation de réduction des cages (en aval de la cage concernée par le changement) comme il a déjà été fait pour l'amont, d'abord sur la plus proche cage à la cage concernée, puis sur la suivante, etc.
  • Ouverture complète de la cage concernée simultanément à l'augmentation de réduction de la cage située immédiatement en amont.
  • Changement de cylindre(s) de la cage concernée.
  • Fermeture de la cage concernée à faible réduction simultanément avec diminution de réduction de la cage située immédiatement en amont de la dite cage concernée.
  • Retour aux niveaux d'origine de réduction des cages amont, en commençant par la première cage du laminoir tandem puis la deuxième.
  • Fermeture de la cage concernée à son niveau de réduction d'origine.
  • Retour aux niveaux de réduction d'origine des cages en aval de la cage concernée, en commençant par la plus proche.
Attempts have been made to make cylinder changes without interrupting rolling. A suitable method for a tandem rolling machine with 6 cages is for example described in JP 62-275515 . This method of changing rolls of a rolling stand is adapted to support at least one working roll for a continuously running steel strip mill, said stand being part of a plurality of rolling stands placed successively along rolling mill in a direction of continuous scrolling. When a change of cylinder is envisaged on any cage (according to an example described in figure 2 of said document), its stop is prepared by distributing its reduction ratio (percentage of thickness reduction of the rolled product) on the upstream and downstream stands in a following time sequence:
  • Increasing reduction of the cages (upstream of the cage concerned by the change) by a fraction of that necessary to compensate for the opening of the cage concerned by the change, by following the first cage sequence of the tandem mill, then the second cage, etc.
  • Decrease of reduction in the cage concerned by the change by keeping only a small residual value.
  • Increasing reduction of the cages (downstream of the cage concerned by the change) as it has already been done upstream, first on the nearest cage to the cage concerned, then on the next, etc.
  • Full opening of the cage concerned simultaneously with the reduction increase of the cage located immediately upstream.
  • Change of cylinder (s) of the concerned cage.
  • Closing the concerned low reduction cage simultaneously with reduced reduction of the cage immediately upstream of said cage concerned.
  • Return to the original reduction levels of upstream cages, starting with the first cage of the tandem mill and then the second.
  • Closing the cage concerned at its original reduction level.
  • Return to the original reduction levels of the cages downstream of the cage concerned, starting with the nearest one.

Cette procédure nécessite, on le voit, la répartition des forces de serrage des cylindres restants en position active de laminage ainsi que des vitesse et couple des moteurs d'une cage sur les autres soit entre 15 et 20% de surcharge pour certaines cages de ce laminoir tandem à six cages. Or, la force de serrage des cages de laminage ne peut être augmentée que dans la limite de résistance des cylindres à la pression de Hertz, laquelle décroit avec le diamètre des cylindres. Cette limite étant atteinte, s'il est nécessaire de réserver une marge de capacité de 20% en vue des changements de cylindres, l'ensemble du laminoir ne pourra pas travailler à sa capacité maximale et se trouvera pénalisé de manière constante en termes de capacité de production. Le gain de productivité du changement de cylindre « à la volée » devient alors marginal ou inexistant.This procedure requires, as can be seen, the distribution of the clamping forces of the remaining rolls in the active rolling position as well as the speed and torque of the motors of one cage on the others, ie between 15 and 20% overload for certain cages of this type. tandem mill with six cages. However, the clamping force of the rolling stands can be increased only in the limit of resistance of the cylinders to the pressure of Hertz, which decreases with the diameter of the cylinders. This limit being reached, if it is necessary to reserve a capacity margin of 20% for cylinder changes, the whole mill will not be able to work at its maximum capacity and will be penalized in a constant way in terms of capacity. of production. The productivity gain of the cylinder change "on the fly" becomes marginal or non-existent.

D'autre part, la séquence temporelle d'augmentation puis de diminution des serrages des cages amont et aval telle qu'elle est décrite dans JP 62-275515 n'est pas en mesure d'entrainer une bonne continuité d'épaisseur de bande durant tout le processus, d'où une épaisseur de sortie de laminage incorrecte dans certaines phases et une dégradation de la mise au mille.On the other hand, the temporal sequence of increase and then decrease of the clampings of the upstream and downstream cages as described in JP 62-275515 is not able to cause a good continuity of tape thickness throughout the process, resulting in an incorrect rolling output thickness in certain phases and a degradation of the setting.

Enfin, le schéma de laminage, c'est-à-dire pour un produit donné et une épaisseur de sortie visée (faisant intervenir le taux de réduction dans chaque cage, la vitesse de rotation des cylindres dans chaque cage, la traction entre chaque cage) doit être modifié pour six cages à douze reprises pendant toute la procédure de changement afin de répartir sur chacune des cages en amont et en aval du lieu de changement une partie de la réduction d'épaisseur non réalisée dans la cage en cours de changement.Finally, the rolling scheme, that is to say for a given product and a target output thickness (involving the reduction rate in each cage, the rotational speed of the cylinders in each cage, the traction between each cage ) must be modified for six cages twelve times throughout the change procedure in order to distribute on each of the cages upstream and downstream of the change site a portion of the unrealized thickness reduction in the cage being changed.

Ce passage transitoire d'un laminage normal à six cages vers un laminage à cinq cages restantes puis en retour au laminage à six cages est difficile à gérer et peut même devenir critique si les augmentations de réduction entrainent une modification du comportement métallurgique de l'acier, par exemple son écrouissage.This transitional transition from normal six-cage rolling to five-cage rolling and then back to six-cage rolling is difficult to manage and may even become critical if the reduction increases cause a change in the metallurgical behavior of the steel. eg its work hardening.

Lorsque ce passage transitoire est concomitant avec un changement de format de bande laminée (par format on entend sa largeur, son épaisseur d'entrée, sa métallurgie), la gestion des transitions peut se révéler quasi impossible. Or, JP 62-275515 indique qu'il est avantageux de placer le changement de cylindre(s) lors d'un passage d'une soudure de bande afin de « grouper » les longueurs hors tolérances propres à la procédure de changement de cylindres et l'inévitable coupe à réaliser pour éliminer la soudure. Systématiser ainsi le passage des soudures de bande avec le changement des cylindres conduit inévitablement à leur concomitance avec tous les changements de format de bande et aggrave les risques de ne pouvoir maitriser correctement l'opération de changement quelle que soit la bande.When this transitional transition is concomitant with a change of rolled strip format (by format means its width, its thickness of entry, its metallurgy), the management of the transitions can be almost impossible. Gold, JP 62-275515 indicates that it is advantageous to place the change of cylinder (s) during a passage of a band weld in order to "group" the lengths out of tolerances specific to the procedure of change of cylinders and the inevitable cut to realize to eliminate the solder. To systematize the passage of the tape welds with the change of the cylinders inevitably leads to their concomitance with all the changes of tape format and aggravates the risks of not being able to master the operation of change correctly whatever the band.

Un but de la présente invention est de proposer une méthode de changement de cylindre(s) d'une cage de laminage adaptée à supporter au moins un cylindre de travail pour un laminoir de bande d'acier en défilement continu, ladite méthode permettant de résoudre les problèmes précités.An object of the present invention is to provide a method of changing a roll (s) of a rolling stand adapted to support at least one working roll for a continuous strip steel strip rolling mill, said method for solving the aforementioned problems.

Une solution est proposée par une méthode au travers de la revendication 1.A solution is proposed by a method through claim 1.

A partir d'une méthode de changement de cylindre(s) d'une cage de laminage adaptée à supporter au moins un cylindre de travail (ayant une fonction de serrage de bande) pour un laminoir à froid de bande d'acier (de type tandem) en défilement continu, ladite cage faisant part d'une pluralité de cages de laminage placées successivement le long du laminoir suivant une direction du défilement continu, il est proposé que :

  • une fonction d'attente de laminage sous une position libre de serrage de cylindre(s) (c'est-à-dire libre d'une pression sur la bande) est attribuée à au moins une cage dédiée sur la pluralité des cages,
  • des valeurs de consigne d'origine régissant un réglage lié au serrage de cylindre(s) sont individuellement attribuées aux autres cages en position active de laminage,
  • en cas de changement de cylindre sous mise en position libre de serrage de la cage, la valeur de consigne d'origine de ladite cage ainsi que les valeurs de consignes d'origine des cages restant en position active de laminage sont redistribuées individuellement sur chacune desdites cages, y compris la cage dédiée.
From a method of changing a cylinder (s) of a rolling stand adapted to support at least one working roll (having a band clamp function) for a cold rolling mill of steel strip (of type tandem) in continuous running, said cage being part of a plurality of rolling stands placed successively along the rolling mill in a direction of continuous running, it is proposed that:
  • a rolling waiting function under a free cylinder clamping position (that is to say free of pressure on the belt) is assigned to at least one dedicated cage on the plurality of cages,
  • original setpoint values governing a setting related to cylinder clamping (s) are individually assigned to the other stands in the active rolling position,
  • in the case of a change of cylinder under free setting of the cage, the original setpoint value of said cage and the original setpoint values of the cages remaining in the active rolling position are redistributed individually on each of said cages, including the dedicated cage.

En d'autres termes, le laminoir comprend un nombre de cages dont une est mise en permanence en fonction libre de serrage (ladite cage dédiée). A la différence d'un laminoir pour lequel une cage sur sa pluralité de cages est mise hors fonction, la cage dédiée selon l'invention vient se substituer à la cage pour laquelle au moins un cylindre doit être changé. Ainsi, très avantageusement, une nouvelle répartition complexe de taux de réduction sur les cages restantes peut être évitée, car il est possible de simplement transférer ou redistribuer les valeurs de consignes de serrage d'une cage vers une autre cage, les deux cages étant mise en position active de laminage de bande en défilement continu. Par la même, ce procédé de transfert de valeur de consigne reste sous forme de réglage très binaire et donc s'affranchit des conditions de propriété et de format de bande, ainsi que de toute concomitance avec des soudures ou des coupes de bande.In other words, the rolling mill comprises a number of cages one of which is permanently in free tightening function (said dedicated cage). Unlike a rolling mill for which a cage on its plurality of cages is disabled, the dedicated cage according to the invention is to replace the cage for which at least one cylinder must be changed. Thus, very advantageously, a new complex distribution of reduction rates on the remaining cages can be avoided, since it is possible to simply transfer or redistribute the values of clamping instructions from one cage to another cage, the two cages being placed in active rolling position of strip in continuous scrolling. By the same token, this method of transfer of the nominal value remains in the form of a very binary adjustment and thus avoids the conditions of ownership and tape format, as well as any concomitance with welds or web cuts.

La séquence temporelle d'augmentation puis de diminution des serrages de cages selon les valeurs de consignes transférées/redistribuées peut donc être fort simplifiée et réduite, ce qui rend l'épaisseur de bande en sortie du laminoir mieux contrôlable sous les tolérances requises, ainsi que garantit une excellente mise au mille.The time sequence of increasing and then decreasing the cage clamps according to the transferred / redistributed setpoint values can therefore be greatly simplified and reduced, which makes the strip thickness at the outlet of the rolling mill better controllable within the required tolerances, as well as guarantees an excellent upgrade.

Bien entendu, en raison d'un transfert synchronisé des valeurs de consignes entre les cages concernées, l'invention permet un changement de cylindres libre de toute interruption de défilement de bande. Pendant la phase de changement de cylindre, la productivité du laminoir reste maximale, comme en phase de non-changement de cylindre.Of course, because of a synchronized transfer of the setpoint values between the cages concerned, the invention allows a change of cylinders free of any break tape. During the cylinder change phase, the productivity of the mill remains at a maximum, as in the non-change cylinder phase.

Un ensemble de sous-revendications présente également des avantages de l'invention suivant différents aspects ou modes de réalisation.A set of subclaims also has advantages of the invention according to different aspects or embodiments.

Des exemples de réalisation et d'application sont fournis à l'aide de figures décrites :

Figures 1a, 1b
méthode de changement selon un premier mode d'application de l'invention,
Figures 2a, 2b
méthode de changement selon une variante du premier mode d'application de l'invention,
Figures 3a, 3b, 3c
méthode de changement selon un deuxième mode d'application de l'invention.
Examples of implementation and application are provided using the figures described:
Figures 1a, 1b
method of change according to a first embodiment of the invention,
Figures 2a, 2b
method of change according to a variant of the first embodiment of the invention,
Figures 3a, 3b, 3c
method of change according to a second embodiment of the invention.

Toutes les figures décrites ci-dessous présentent un laminoir comportant six cages et leurs cylindres C1, C2, C3, C4, C5, C6 successivement ordonnées le long de la bande B en défilement continu suivant sa direction D de défilement. Pour des raisons de clarté, il est aussi représenté qu'une coupe supérieure de la bande arrêtée par un plan de symétrie Ax (parallèle et équidistant aux deux surfaces de bande). A chacun de cinq des six cylindres en position active de laminage est attribuée une valeur de consigne de serrage R1, R2, R3, R4, R5. Par extension, il sera fait référence au terme « cage » pour désigner au moins un cylindre dans cette même cage. De même, il sera fait usage des termes « première cage », « deuxième-cage », ..., « Nième cage ». Cette numérotation signifie que la première cage est située la plus an amont suivant la direction D de défilement de bande (en entrée de bande dans le laminoir) alors que les cages suivantes sont placées de plus en plus en aval de la première cage.All the figures described below show a rolling mill comprising six cages and their cylinders C1, C2, C3, C4, C5, C6 sequentially arranged along the continuous strip B in its direction D of scrolling. For the sake of clarity, it is also shown that an upper section of the band stopped by a plane of symmetry Ax (parallel and equidistant to the two strip surfaces). Each of five of the six cylinders in the active rolling position is assigned a clamping set value R1, R2, R3, R4, R5. By extension, reference will be made to the term "cage" to designate at least one cylinder in this same cage. Similarly, the terms "first cage", "second-cage", ..., "Nth cage" will be used. This numbering means that the first cage is located the most upstream in the direction D tape travel (at the entrance of the strip in the rolling mill) while the following cages are placed further downstream of the first cage.

Plus généralement, le laminoir représenté permet la mise en oeuvre de la méthode de changement de cylindres d'une cage C de laminage adaptée à supporter au moins un cylindre de travail pour ledit laminoir de bande d'acier en défilement continu, ladite cage C faisant part d'une pluralité N (cas présent N=6) de cages de laminage placées successivement le long du laminoir suivant la direction D du défilement continu, de telle façon que :

  • une fonction d'attente de laminage sous une position libre de serrage de cylindre(s) est attribuée à au moins une cage dédiée CA sur la pluralité N des cages,
  • des valeurs de consigne d'origine régissant un réglage lié au serrage de cylindre(s) sont individuellement attribuées aux autres cages en position active de laminage,
  • en cas de changement de cylindre sous mise en position libre de serrage de la cage C, la valeur de consigne d'origine de ladite cage C ainsi que les valeurs de consignes d'origine des cages restant en position active de laminage sont redistribuées individuellement sur chacune desdites cages, y compris la cage dédiée CA.
More generally, the rolling mill shown allows the implementation of the roll changing method of a rolling cage C adapted to support at least one working roll for said rolling steel strip rolling mill, said cage C making part of a plurality N (in this case N = 6) of rolling cages placed successively along the rolling mill in the direction D of the continuous scroll, so that:
  • a rolling waiting function under a free cylinder clamping position (s) is assigned to at least one dedicated cage CA on the plurality N of the cages,
  • original setpoint values governing a setting related to cylinder clamping (s) are individually assigned to the other stands in the active rolling position,
  • in the case of a change of cylinder under the free clamping position of the cage C, the original setpoint value of said cage C and the original setpoint values of the cages remaining in the active rolling position are redistributed individually on each of said cages, including the dedicated cage CA.

La bande B est constamment laminée par passage dans N-1 cages de laminage sur un nombre total de N cages que comporte le laminoir, l'une quelconques des cages du laminoir se trouvant soit en cours de changement de cylindres (et ainsi désignée par la cage C) soit en position d'attente d'une nouvelle opération de changement (et ainsi désignée par la cage CA ou C).The strip B is constantly rolled by passing through N-1 rolling mills on a total number of N cages that includes the rolling mill, any one of the mill stands being in the process of cylinder change (and thus designated by the cage C) is in the waiting position of a new change operation (and thus designated by the cage CA or C).

La cage C dans laquelle vient de s'effectuer un changement de cylindre(s) reste donc en position d'attente telle que l'état la cage dédiée CA à l'origine jusqu'au prochain changement de cylindre(s) d'une autre cage.C cage in which has just made a change of cylinder (s) remains in the waiting position such that the state cage dedicated CA to the original until the next change of cylinder (s) of a other cage.

En fonction de la position relative de la cage dédiée CA en attente par rapport à la cage C où doit intervenir un changement de cylindres, la méthode sous un premier mode de réalisation connaît deux variantes, respectivement représentées par les figures 1a, 1b et 2a, 2b.As a function of the relative position of the dedicated cage CA waiting with respect to the cage C where a change of cylinders must occur, the method under a first embodiment has two variants, respectively represented by the FIGS. 1a, 1b and 2a, 2b .

Figure 1a montre un état de laminoir précédent un changement de cylindre intervenant pour la deuxième cage C=C2. Suivant la direction D de défilement de la bande, la cage dédiée CA=C6 est alors la sixième cage C6 et est donc située en aval de la deuxième cage C=C2 vouée à un changement imminent. La cage dédiée CA=C6 est en fonction d'attente de laminage sous une position libre de serrage. A ce stade, les cinq premières cages C1, C=C2, C3, C4, C5 sont en position de laminage actif selon chacune des valeurs de consignes de serrage d'origine R1, R2, R3, R4, R5 qui leur sont attribuées et induisent un laminage croissant de la bande. La dernière valeur de consigne R5 sur le cinquième cylindre C5 permet à la bande d'avoir une épaisseur E en sortie de laminoir. Figure 1a shows a rolling mill state preceding a change of cylinder intervening for the second cage C = C2. Next to the bandwidth direction D, the dedicated cage CA = C6 is then the sixth cage C6 and is therefore located downstream the second C = C2 cage is destined for imminent change. The dedicated cage CA = C6 is in rolling stand function under a free clamping position. At this stage, the first five stands C1, C = C2, C3, C4, C5 are in the active rolling position according to each of the original set point values R1, R2, R3, R4, R5 which are assigned to them and induce increasing rolling of the strip. The last set value R5 on the fifth cylinder C5 allows the strip to have a thickness E at the output of the rolling mill.

Figure 1b montre un état de laminoir en phase de changement de cylindre (deuxième cage C=C2) tel que représenté à la figure 1a. Lors du changement de cylindre de la deuxième cage C=C2 étant située selon la direction D de défilement en amont de la cage dédiée initialement CA=C6 en position d'attente, la valeur de consigne d'origine R2 de ladite deuxième cage C=C2 est transférée sur la troisième cage C3 située immédiatement à son aval, la valeur de consigne d'origine R3 de cette dernière troisième cage C3 étant elle-même transférée sur la quatrième cage C4 située immédiatement à son aval et, si besoin (comme ici, la valeur de consigne d'origine R4 de cette dernière quatrième cage C4 étant elle-même transférée sur la cinquième cage C5 située immédiatement à son aval), ainsi de suite jusqu'à la cage dédiée CA=C6 en position d'attente qui est alors mise en position active de laminage sous la dernière et cinquième valeur de consigne R5. Figure 1b shows a rolling mill state in the cylinder change phase (second cage C = C2) as shown in FIG. figure 1a . When changing the cylinder of the second cage C = C2 being located in the direction of travel D upstream of the cage initially dedicated CA = C6 in the waiting position, the original reference value R2 of said second cage C = C2 is transferred to the third cage C3 located immediately downstream, the original set point R3 of the latter third cage C3 is itself transferred to the fourth cage C4 located immediately downstream and, if necessary (as here , the original reference value R4 of the latter fourth cage C4 itself being transferred to the fifth cage C5 located immediately downstream thereof, and so on until the dedicated cage CA = C6 in the waiting position which is then placed in the active rolling position under the last and fifth setpoint R5.

Le changement de cylindre(s) de la deuxième cage C=C2 peut alors se faire sans interruption du défilement de la bande. Il est alors aussi possible d'attribuer à cette deuxième cage la fonction d'attente de la cage dédiée CA=C6 (maintenant en fonction de laminage actif), jusqu'à ce qu'un changement d'un autre cylindre/cage C doive intervenir. La méthode peut donc être appliquée sans limite temporelle, si tel est souhaité, par simple réattribution de la fonction d'attente (libre de laminage) de la cage dédiée sur une des cages où est intervenu un changement de cylindre, en attendant ainsi un prochain changement de cage.The change of cylinder (s) of the second cage C = C2 can then be done without interrupting the scrolling of the strip. It is then also possible to assign to this second cage the waiting function of the dedicated cage CA = C6 (now active rolling function), until a change of another cylinder / cage C should intervene. The method can therefore be applied without temporal limitation, if desired, simply by reassigning the waiting function (free rolling) of the dedicated cage on one of the cages where it has occurred. a change of cylinder, thus waiting for a next cage change.

Figure 2a montre un état de laminoir suivant une variante au changement de cylindre des figures 1a, 1b intervenant alors pour la cinquième cage C=C5. Suivant la direction D de défilement de la bande, la cage dédiée CA=C3 est (inversement aux figures 1a, 1b) la troisième cage C3 et est donc située en amont de la cinquième cage C=C5 vouée à un changement imminent. La cage dédiée CA=C3 est en fonction d'attente de laminage sous une position libre de serrage. A ce stade, les deux premières et les trois dernières cages C1, C=C2, C4, C5, C6 sont en position de laminage actif selon chacune des valeurs de consignes de serrage d'origine R1, R2, R3, R4, R5 qui leur sont attribuées et induisent un laminage croissant de la bande. La dernière valeur de consigne R5 sur le sixième cylindre C6 permet à la bande d'avoir une épaisseur E en sortie de laminoir. Figure 2a shows a state of rolling mill according to a variant to the cylinder change of Figures 1a, 1b intervening then for the fifth cage C = C5. According to the direction of travel D of the band, the dedicated cage CA = C3 is (conversely to Figures 1a, 1b ) the third cage C3 and is located upstream of the fifth cage C = C5 doomed to an imminent change. The dedicated cage CA = C3 is in rolling stand function under a free clamping position. At this stage, the first two and last three cages C1, C = C2, C4, C5, C6 are in the active rolling position according to each of the original tightening setpoints R1, R2, R3, R4, R5 which are attributed to them and induce an increasing rolling of the band. The last set value R5 on the sixth cylinder C6 allows the strip to have a thickness E at the output of the rolling mill.

Figure 2b montre un état de laminoir en phase de changement de cylindre (cinquième cage C=C5) tel que représenté à la figure 2a. Lors du changement de cylindre de la cinquième cage C=C5 étant située selon la direction D de défilement en aval de la (troisième) cage dédiée initialement CA=C3 en position d'attente, la valeur de consigne d'origine R4 de ladite cinquième cage C=C5 est transférée sur la quatrième cage C4 située immédiatement à son amont, la valeur de consigne d'origine R3 de cette dernière quatrième cage C4 étant elle-même transférée sur la troisième cage C3 (ici également la cage dédiée CA) située immédiatement à son amont. La première et la deuxième cage C1, C2 conservent leur position de serrage sous leurs valeurs de consigne R1, R2 respectives. S'il y avait eu besoin dans le cas plus de cages intercalées entre la cage C vouée au changement et la cage dédiée CA en son amont, les valeur de consigne d'origine de ces dites cages intercalées auraient été elles-mêmes transférées sur les cages située immédiatement à leur aval, ainsi de suite jusqu'à la cage dédiée CA en position d'attente qui est alors mise en position active de laminage sous la troisième valeur de consigne R3 (valeur de consigne d'origine de la quatrième cage avant changement de cylindre). Figure 2b shows a rolling mill state in the cylinder change phase (fifth cage C = C5) as shown in FIG. figure 2a . When changing the cylinder of the fifth cage C = C5 being located in the direction D of scrolling downstream of the (third) cage initially dedicated CA = C3 in the waiting position, the original reference value R4 of said fifth C = C5 cage is transferred to the fourth cage C4 located immediately upstream, the original set point R3 of the latter fourth cage C4 itself being transferred to the third cage C3 (here also the dedicated cage CA) immediately upstream. The first and the second cage C1, C2 retain their clamping position below their respective setpoints R1, R2. If there was need in the case of more cages interposed between the cage C dedicated to the change and the dedicated cage CA upstream, the original set values of these said interposed cages would themselves have been transferred to the cages located immediately downstream, so on until the dedicated cage CA in the standby position which is then placed in the active rolling position under the third setpoint value R3 (original setpoint value of the fourth cage before changing the cylinder).

Le changement de cylindre(s) de la cinquième cage C=C5 peut alors se faire sans interruption du défilement de la bande. Identiquement au premier mode de réalisation selon les figures 1a, 1b, il est alors aussi possible d'attribuer à cette cinquième cage la fonction d'attente de la cage dédiée CA=C3 (maintenant en fonction de laminage actif), jusqu'à ce qu'un changement d'un autre cylindre/cage C doive intervenir. La méthode peut donc être appliquée sans limite temporelle, si tel est souhaité, par simple réattribution de la fonction d'attente (libre de laminage) de la cage dédiée sur une des cages où est intervenu un changement de cylindre, en attendant ainsi un prochain changement de cage.The change of cylinder (s) of the fifth cage C = C5 can then be done without interrupting the scrolling of the strip. Identically to the first embodiment according to Figures 1a, 1b , it is then also possible to assign to this fifth cage the waiting function of the dedicated cage CA = C3 (now active rolling function), until a change of another cylinder / cage C must intervene. The method can therefore be applied without time limit, if desired, simply by reassigning the waiting function (rolling free) of the dedicated cage to one of the cages where a change of cylinder has taken place, thus waiting for a next cage change.

Dans les deux cas suivant les figures 1a, 1b et 2a, 2b, il s'agit ainsi d'un seul transfert de cage à cage de consignes de réglages appartenant au schéma de laminage d'origine et non d'un changement spécifique et complexe de programme de laminage.In both cases following the FIGS. 1a, 1b and 2a, 2b it is thus a single transfer cage cage setting instructions belonging to the original rolling pattern and not a specific and complex change in rolling program.

D'autre part, les transferts de consignes de réglage au moyen d'un système de contrôle automatique d'épaisseur de bande (connu en anglais sous le nom de Automatic Gauge Control « AGC ») sont organisés en tenant compte des temps de parcours inter-cages de la bande de telle manière qu'aucune portion de ladite bande ne soit hors tolérance d'épaisseur. L'opération de changement est donc sans impact sur la mise au mille.On the other hand, the transfer of setting instructions by means of an automatic web thickness control system (known in English as the Automatic Gauge Control (AGC)) are organized taking into account the travel times -cages of the band such that no portion of said band is out of thickness tolerance. The change operation is therefore without impact on the pie.

Enfin, n'ayant pas à être surchargées momentanément par la répartition de la réduction d'une cage vouée au changement de cylindre(s) sur les autres cages, toutes les cages peuvent travailler à leur capacité maximale, ce qui est la meilleure manière de rentabiliser un investissement aussi lourd qu'un laminoir tandem à défilement continu de bande.Finally, not having to be temporarily overloaded by the distribution of the reduction of a cage dedicated to the change of cylinder (s) on the other cages, all the cages can work at their maximum capacity, which is the best how to make the investment as heavy as a tandem rolling mill with continuous strip

Figure 3a, 3b et 3c décrivent un second mode d'application de l'invention. Principalement, les figures 3a et 3b sont identiques aux figures 1a et 1b, en ce que la cage dédiée CA=C6 en position d'attente est située selon la direction D de défilement en aval de la dernière cage C5 en position active de laminage. La cage CA est dédiée à permettre un changement de cylindres de toutes les autres cages situées en son amont. Elle n'est mise en service que lorsqu'une cage quelconque du laminoir est en cours de changement de cylindres et pour la seule durée de ce changement. Hors opérations de changement de cylindres, cette cage dédiée est en position d'attente (libre de fonction de laminage). Figure 3a, 3b and 3c describe a second embodiment of the invention. Mainly, Figures 3a and 3b are identical to Figures 1a and 1b , in that the dedicated cage CA = C6 in the waiting position is located in the direction D of travel downstream of the last cage C5 active rolling position. The cage CA is dedicated to allow a change of cylinders of all other cages located upstream. It is only put into service when any roll stand is in the process of changing rolls and only for the duration of this change. Except for cylinder change operations, this dedicated cage is in the waiting position (free of rolling function).

De manière avantageuse, cette cage dédiée CA est donc placée en aval de la dernière cage de laminage actif qui est celle dont on change le plus souvent les cylindres.Advantageously, this dedicated cage CA is placed downstream of the last active rolling stand which is the one whose cylinders are most often changed.

Les figures 3a, 3b étant déjà précédemment décrites, figure 3c représente la remise en fonction d'attente de la cage dédiée CA après remise en position de laminage actif de la cage en amont C=C2 (pour laquelle au moins un cylindre a pu être changé lors de la phase selon figure 3b). La figure 3c est donc un retour classique vers la figure 3a.The Figures 3a, 3b already already described, figure 3c represents the return to the waiting function of the dedicated cage CA after returning to the active rolling position of the cage upstream C = C2 (for which at least one cylinder could be changed during the phase according to figure 3b ). The figure 3c so is a classic return to the figure 3a .

Plus précisément selon figure 3b, lors du changement de cylindre de la deuxième cage C=C2, sa valeur de consigne R2 d'origine est transférée sur une troisième cage C3 située selon la direction D de défilement immédiatement à son aval, la valeur de consigne R3 d'origine de ladite cage C3 en aval étant elle même transférée sur la quatrième cage C4 située également immédiatement à son aval et ainsi de suite jusqu'à la cage dédiée CA=C6, elle-même mise en fonction de laminage actif lors du changement de cylindre de la deuxième cage C=C2. Enfin, après changement de cylindre de la deuxième cage C=C2 selon figure 3c, la valeur de consigne R2 d'origine est restituée à la deuxième cage changée C=C2 ainsi que, itérativement, chacune des valeurs de consigne d'origine des cages C3, C4, ... situées en aval et ainsi de suite jusqu'à la cage dédiée CA=C6 étant alors remise à nouveau en fonction d'attente de laminage sous une position libre de serrage laminaire de bande.More precisely according to figure 3b during the change of the cylinder of the second cage C = C2, its original reference value R2 is transferred to a third cage C3 located in the direction D of travel immediately downstream, the reference value R3 of origin of said downstream cage C3 itself being transferred to the fourth cage C4 also located immediately downstream thereof and so on until the dedicated cage CA = C6, which is itself put into active rolling function when the cylinder is changed. second cage C = C2. Finally, after changing the cylinder of the second cage C = C2 according to figure 3c , the original R2 setpoint is returned to the second cage changed C = C2 and, iteratively, each of the original setpoint values of cages C3, C4, ... located downstream and so on until the dedicated cage CA = C6 is then reset again as a function of waiting for rolling under a laminar laminar free clamping position.

Claims (5)

  1. Method of changing roller(s) in a roll stand (C) adapted for bearing at least one working roller for a continuously running steel-strip cold roll mill, said stand (C) forming part of a plurality (N) of roll stands arranged in series along the roll mill in the continuous running direction (D),
    characterised in that
    - a roll standby function in a free clamping position of the roller(s) is allocated to at least one dedicated stand (CA) among the plurality (N) of stands,
    - original setpoint values controlling an adjustment associated with the clamping of the roller(s) are individually allocated to the other stands in an active rolling position,
    - in the event of a roller change when passing into the free clamping position (C), the original setpoint value of said stand (C) and the original setpoint values of the stands remaining in an active rolling position are redistributed individually among each of said stands, including the dedicated stand (CA).
  2. Method according to claim 1, wherein:
    when changing a roller on the stand (C=C2) located in the direction (D) of travel upstream of the dedicated stand (CA=C6) in standby position, the original setpoint value of said stand (C=C2) is transferred to a stand (C3) located immediately downstream of it, the original setpoint value of the latter stand (C3) being itself transferred to a stand (C4) located immediately downstream of it and, if necessary, so on as far as the dedicated stand (CA=C6) in standby position, which is then put into active rolling position.
  3. Method according to one of claims 1 to 2, wherein:
    when changing a roller on the stand (C=C5) located in the direction (D) of travel downstream of the dedicated stand (CA=C3) in standby position, the original setpoint value of said stand (C=C5) is transferred to a stand (C4) located immediately upstream of it, the original setpoint value of the latter stand (C4) being itself transferred to a stand (C3) located immediately upstream of it and,
    if necessary, so on as far as the dedicated stand (CA) in standby position.
  4. Method according to one of the preceding claims, wherein the dedicated stand (CA=C6) in standby position is located in the direction (D) of travel downstream of the last stand (C5) in active rolling position.
  5. Method according to claim 4, wherein:
    when changing a roller on the stand (C=C2), its original setpoint value is transferred to a stand (C3) located in the direction (D) of travel immediately downstream of it,
    the original setpoint value of said stand (C3) downstream being itself transferred to a stand (C4) also located immediately downstream of it and so on as far as the dedicated stand (CA=C6). After changing a roller on the stand (C=C2), the original setpoint value is restored to the changed stand (C=C2) as for, iteratively, each of the original setpoint values of the stands (C3, C4, ...) located downstream and so on as far as the dedicated stand (CA=C6), it being then again returned to roll standby function in a free clamping position.
EP08874694.6A 2008-06-19 2008-06-19 Method for changing a roller in a roll mill for a continuously running steel strip Revoked EP2303482B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FR2008/000857 WO2009153415A1 (en) 2008-06-19 2008-06-19 Method for changing a roller in a roll mill for a continuously running steel strip

Publications (2)

Publication Number Publication Date
EP2303482A1 EP2303482A1 (en) 2011-04-06
EP2303482B1 true EP2303482B1 (en) 2014-08-06

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Application Number Title Priority Date Filing Date
EP08874694.6A Revoked EP2303482B1 (en) 2008-06-19 2008-06-19 Method for changing a roller in a roll mill for a continuously running steel strip

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US (1) US8479366B2 (en)
EP (1) EP2303482B1 (en)
JP (1) JP5474059B2 (en)
KR (1) KR101460841B1 (en)
CN (1) CN102066015B (en)
BR (1) BRPI0822799A2 (en)
RU (1) RU2472597C2 (en)
WO (1) WO2009153415A1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2777832A1 (en) 2013-03-13 2014-09-17 Siemens VAI Metals Technologies GmbH Device for rotating the working rolls of a rolling mill and method for changing said rolls
DE102015218360A1 (en) * 2015-09-24 2017-03-30 Sms Group Gmbh Roll stand and method for changing work rolls
EP3208673B1 (en) 2016-02-22 2019-06-05 Primetals Technologies Austria GmbH In-line calibration of the roller gap of a roller stand
FR3050128B1 (en) 2016-04-18 2018-09-07 Fives Dms METHOD FOR CHANGING CYLINDERS OF A ROLLING MILL
CN105945071A (en) * 2016-06-24 2016-09-21 燕山大学 On-line roller change device and method for finish rolling unit in endless strip production
CN112380634B (en) * 2019-07-29 2024-03-01 上海梅山钢铁股份有限公司 Method for improving effective working layer of finish rolling working roll suitable for hot rolling old rolling mill
CN114985474B (en) * 2022-05-06 2023-04-18 燕山大学 Process method for online roll changing of dynamic dislocation regulation of DS rolling mill unit

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3913368A (en) * 1974-09-04 1975-10-21 Blaw Knox Foundry Mill Machine Tandem rolling mill
SU995944A1 (en) * 1981-07-14 1983-02-15 Центральное Проектно-Конструкторское Бюро По Системам Автоматизации Производства "Союзпромавтоматика" Минприбора Apparatus for power changing of stands at endless strip rolling
JPS5933014A (en) * 1982-08-18 1984-02-22 Kawasaki Steel Corp Exchanging method of rolls for fully continuous tandem mill
JPS62101307A (en) * 1985-10-29 1987-05-11 Ishikawajima Harima Heavy Ind Co Ltd Rearranging method for roller
JPS62101309A (en) * 1985-10-29 1987-05-11 Ishikawajima Harima Heavy Ind Co Ltd Shifting method for roller
JPS62275515A (en) * 1986-05-22 1987-11-30 Nippon Steel Corp Continuous rolling control method
DE4104001A1 (en) * 1991-02-09 1992-08-13 Schloemann Siemag Ag Continuous cast slab finishing - has stand to compress material at edges directly before rolling for thickness redn.
RU2006304C1 (en) * 1992-04-20 1994-01-30 Производственное Объединение "Электростальтяжмаш" Method for changing of linear rolling mill stands working rolls
DE10138589A1 (en) 2001-08-06 2003-02-20 Sms Demag Ag Device for automatically exchanging a roller set in a rolling mill comprises positioning a traverse on a roller exchange car having wheels, moving the traverse on guide rails into the roll stand, and withdrawing from the stand

Also Published As

Publication number Publication date
CN102066015B (en) 2014-10-08
JP2011524810A (en) 2011-09-08
RU2011101722A (en) 2012-07-27
RU2472597C2 (en) 2013-01-20
EP2303482A1 (en) 2011-04-06
BRPI0822799A2 (en) 2015-06-30
KR101460841B1 (en) 2014-11-11
US8479366B2 (en) 2013-07-09
US20110099783A1 (en) 2011-05-05
WO2009153415A1 (en) 2009-12-23
KR20110025916A (en) 2011-03-14
CN102066015A (en) 2011-05-18
JP5474059B2 (en) 2014-04-16

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