EP2167248A1 - Method for rolling a metal strip with adjustment of the side position of the strip and adapted rolling mill - Google Patents

Method for rolling a metal strip with adjustment of the side position of the strip and adapted rolling mill

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Publication number
EP2167248A1
EP2167248A1 EP08805610A EP08805610A EP2167248A1 EP 2167248 A1 EP2167248 A1 EP 2167248A1 EP 08805610 A EP08805610 A EP 08805610A EP 08805610 A EP08805610 A EP 08805610A EP 2167248 A1 EP2167248 A1 EP 2167248A1
Authority
EP
European Patent Office
Prior art keywords
strip
rolling mill
rolling
values
stands
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP08805610A
Other languages
German (de)
French (fr)
Other versions
EP2167248B1 (en
Inventor
Christian Moretto
Rémi Bonidal
Patrick Czepanski
Niis Naumann
Jamal Daafouz
Claude Iung
Uwe Koschack
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ArcelorMittal France SA
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ArcelorMittal France SA
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Application filed by ArcelorMittal France SA filed Critical ArcelorMittal France SA
Publication of EP2167248A1 publication Critical patent/EP2167248A1/en
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Classifications

    • 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
    • B21B37/68—Camber or steering control for strip, sheets or plates, e.g. preventing meandering
    • 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
    • B21B1/26—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 by hot-rolling, e.g. Steckel hot mill
    • 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
    • B21B1/28—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 by cold-rolling, e.g. Steckel cold mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2273/00—Path parameters
    • B21B2273/04—Lateral deviation, meandering, camber of product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product

Definitions

  • the invention relates to the rolling of metallurgical products. More specifically, it relates to the regulation of the lateral positioning of metal strips, in particular steel, inside a rolling mill. Usually, hot-rolled steel strips are manufactured according to the following scheme:
  • a finishing mill comprising a plurality of cages (for example six or seven) in which the strip is simultaneously present, so as to give it a thickness of 1, 5 to 10 mm, and then put of the web in the form of a reel.
  • thermomechanical treatments which will give it its final properties, or undergo a cold rolling which will further reduce its thickness before the completion of the final thermomechanical treatments.
  • tape offsets inside the finishing mill, ie a deviation of the band from its nominal trajectory between two cages. This deviation can reach about thirty mm on either side of this nominal trajectory if nothing is done to compensate for it.
  • Tape offsets can be the cause of incidents such as creasing and rupturing of the belt during rolling, refusal to engage the tape in the roll hold a cage of the finisher, a marking of the rolls of the rolling mill following an impact with the band.
  • These defects may be due to the state of the band itself, or the mechanical disturbances that its treatment in abnormal conditions causes in the operation of the mill.
  • the offset deteriorates the homogeneity of the thickness of the strip at the output of the finishing mill. Finally, it can hinder the successful realization of the winding of the band.
  • band offsets are also at the origin of a defect form called “sword”: a band with this defect, instead of being straight, is bent in a horizontal plane.
  • This defect is due to the existence of a wedge, that is to say a difference in thickness between the two sides of the rolled strip, whose cause may be thermal or mechanical if the heating or rolling were not performed very homogeneously over the entire width of the product.
  • the web offsets can be corrected by means of lateral guides placed between the roll stands, against which the strip comes rubbing when it deviates from its nominal path, and which reorient it towards said nominal path. But when the offset becomes very important (especially at the end of rolling, when the cage located just upstream of the cage considered released the tail of the band and therefore free to pivot to the side of the cage where the air gap cylinders is the largest), the effort that the guides must exert on the band causes friction that deteriorate its banks, sometimes going as far as folding them on themselves or pulling them off. In addition, the guides wear out and need to be replaced periodically.
  • a second method of regulating the web offset is to directly measure the decentering of the web, as described in DE-3837101.
  • a device such as a diode camera provided with a reference frame, which determines the absolute position of the strip with respect to the axis of the rolling mill or any other reference position, is placed between two mill stands. According to this indication, one acts if necessary on the difference between the tightenings exerted by the rolls of this cage on both banks of the band. As in the previous method, an increase in clamping on the side where the offset takes place tends to bring the band back to its nominal position. Thus, if we see that the band goes to the left, we modify the tightening to deflect to the right.
  • the object of the invention is to propose a method for rolling a strip in a rolling mill of metal products that makes it possible to effectively control the lateral position of this strip during its rolling and that makes it possible to act more accurately and quickly than existing methods, so as to avoid rolling incidents.
  • An additional advantage would be to obtain a band free of wedge and therefore saber.
  • the subject of the invention is a method for rolling a strip inside a rolling mill of metal products comprising at least two cages in which said strip is simultaneously under the influence, according to which the lateral position is regulated. of said band, said regulation comprising the following operations:
  • the value (Sp) of the additional skewness to be imposed on each of said mill stands in which said strip (B) is in line is calculated so as to reduce said algebraic gaps ( ⁇ xp) below a predetermined threshold, the calculation of said additional drift values (Sp) being performed by multiplying said difference values ( ⁇ xp) by a gain matrix K determined by modeling the relations linking said deviation values ( ⁇ xp) of the band and said swaying (Sp) of the rolling mill support rolls;
  • each of said rolling mill stands is given the respective additional setback instruction (Sp), and said operations are repeated at predetermined time intervals, until said band is no longer under the influence of the last stand of said rolling mill.
  • Sp setback instruction
  • the reference position is chosen so that the corner of the strip is zero
  • the gain matrix K is determined by taking into account at least one initial adjustment parameter of the rolling method and at least one characteristic of the strip; (B) rolling,
  • the gain matrix K is constant until the strip is no longer under the influence of the first roll stand, the calculated lateral position value of the strip is obtained by using the parameters of the roll matrix; K gain,
  • At least two of the values representative of the lateral position of the strip are values provided by sensors placed downstream of the corresponding rolling mill stands; at least one of the values representative of the lateral position of the strip is a value calculated from values provided by said sensors placed downstream of the other rolling stands, the other representative values being the values provided by the sensors, - all the values representative of the lateral position of the strip are values measured by the sensors, the number of one downstream of each roll stand.
  • the values provided by the sensors are obtained by filtering the raw acquisition signal, the filtering taking into account the calculated values of deviations ( ⁇ xp) between the lateral positions of the band and the reference position,
  • the additional skew value to be applied is determined by using a value representative of the angle of rotation of the tail of the strip at the entrance of the cage,
  • the value representative of said pivot angle is calculated by means of values representative of the lateral position of the strip along a line transverse to its direction of displacement, in said cages in line with the strip, said representative values being obtained according to the invention; .
  • the invention also relates to a device for regulating the lateral position of a strip inside a rolling mill of metal products comprising at least two cages in which the strip is simultaneously under the influence and comprising:
  • At least two sensors providing a raw acquisition signal enabling the determination of values representative of the lateral position of the strip in a line transverse to its direction of movement downstream of at least two roll stands;
  • the device according to the invention may further comprise means for filtering the raw signal for acquiring the sensors.
  • the invention also relates to a device for regulating the position of the tail of a strip inside a rolling mill of metal products comprising at least two cages, comprising:
  • the invention finally relates to a rolling mill of metal products in the form of strips of the type comprising at least two cages and at least one device for regulating the lateral position of the band of the type according to the invention.
  • This mill may further include at least one device for regulating the position of the tail of the strip according to the invention.
  • the rolling mill according to the invention may further comprise the following optional characteristics, taken separately or in combination: the mill may be a finishing mill for the hot rolling of steel strips
  • the rolling mill may comprise two, five, six or seven rolling stands.
  • the rolling mill may be a rolling mill for cold rolling or skinpassing of steel strips.
  • the invention consists first of all in controlling the offset of the strip by the imposition of an additional skew at each roll stand between which the strip is in tension, each sway being calculated from representative values of the offset of the strip in all inter-cage areas.
  • This process allows to combine efficiency and speed of control, without risk for the band and the mill.
  • This skew value can be adjusted by squeezing the ends of the support rolls more or less.
  • - Fig.1 diagram of a rolling mill with two cages equipped with a control device according to the invention
  • FIG. 2 diagram of a rolling mill with five stands equipped with a regulating device according to the invention
  • FIG. 3 five curves representing a simulation of offsets at the outlet of each roll stand of the rolling mill of FIG. time function for a first laminated strip according to the invention and a second laminated strip according to the prior art, and a curve representing the residual wedge at the exit of the rolling mill for these two strips,
  • first curve representing a simulation of the evolution of the offsets at the output of each roll of the mill of Figure 2, as a function of time and second curve representing the values of additional skewings applied to each cage that allowed to get the deviations presented at the first curve
  • curve representing the evolution of the offset at each inter-cage when the method according to the invention is implemented shows a metal strip B being rolled in a rolling mill comprising two cages 1, 2 in which the strip B is simultaneously under the influence, for example a finishing mill for the hot rolling of the steel strips. type include usually 5, 6 or 7 cages.
  • Each cage 1, 2 comprises, conventionally, two working rolls 1a, 1a 1 , 2a, 2a 1 and two support rolls 1b, 1b ', 2b, 2b 1 .
  • a first sensor 4 (such as a diode camera, or any other apparatus of equivalent function) which acquires a raw signal allowing in fine to determine a value representative of the position of the band B, according to a line transverse to its direction of displacement, between the cage 1 and the cage 2, and a second sensor 5 similar to the previous one, which performs the same operation downstream of the cage 2.
  • dotted lines 6 there is shown a reference position that should normally occupy band B in the absence of offset. This reference position is generally centered on the theoretical geometric axis of the rolling mill. However, it may be advantageous to choose a different reference position to minimize the residual wedge of the strip B at the exit of the rolling mill.
  • This reference position 6 is stored in a first processing unit 7 to which are sent the raw signals collected by the sensors 4, 5, and this first processing unit 7 determines the values of the algebraic deviations ⁇ x1 and ⁇ x2 between the positions of the band B recorded respectively by the sensors 4 and 5 and the reference position 6.
  • the processing unit 7 may have to process the raw signal of the sensor to obtain a value representative of the position of the strip (B).
  • the acquisition signal consists of an image of the area covered by the camera.
  • the signal can then be processed using appropriate software for filtering the active pixels and for detecting the contours of the band B and thus determining its lateral position.
  • the sensors 4 and 5 will preferably be positioned perpendicular to their respective measurement zones and will have to be fixed on independent supports of the rolling mills, presenting the least possible vibration.
  • the sensor 5 can be used both to control the offset of the strip B, but also to measure its width at the exit of the rolling mill.
  • the calculated values of ⁇ x1 and ⁇ x2 are then transmitted to a second processing unit 8 which calculates the additional sway values S1 and S2 to be imposed on the cages 1 and 2.
  • the calculation of S1 and S2 is performed by multiplying the values of ⁇ x1 and
  • a third processing unit 9 has the function of determining this gain matrix K which will be transmitted to the calculation unit 8.
  • the gain matrix K is obtained by modeling the relations linking the offsets of the strip and the shaking of the rolls of support of the rolling mill.
  • This modeling may take into account one or more quantities characteristic of the rolling process, such as the width of the rolls, the rolling force, the rotational speed of the work rolls, etc.
  • the strip to be rolled may also take into account one or more characteristics of the strip to be rolled, such as the thickness of the strip at the entrance of the mill, its hardness, its temperature, etc. It will thus be possible to use average matrices determined by rolling different products, representative of the production booklet or even specific matrices for a particular product, which allows to gain in precision.
  • the gain matrix K remains constant during the rolling process of at least one band B 1 as long as the band remains under the influence of the first rolling mill stand, only the values representative of the offset of the band being then modified at each new data acquisition cycle of sensors 4 and 5.
  • the tape leaves the grip of the first cage of rolling mill, we can use a modified gain matrix taking into account that the band is no longer under the influence of N-1 cages, if n is the total number of cage.
  • the values of the tightening instructions S1 and S2 can then be transmitted to means 10 for transmitting the instructions that will be imposed on the actuators controlling the dishing of the cages 1 and 2 (which are of a type known in themselves and not shown in Figure 1).
  • the method according to the invention makes it possible to control the lateral offsets of the strip with respect to its nominal position and to pass below the threshold of 10 mm, whereas the methods of the prior art do not make it possible to go below the threshold of 20 mm. mm.
  • the regulation cycle may be renewed every 50 or 100 ms, for example, the frequency being preferably chosen to ensure good stability of the regulation.
  • strip tail This part of the band is likely to rotate by relative to the rolling axis and can even form folds that damage the working rolls of the rolling mill.
  • FIG. 2 shows schematically a rolling mill with five cages provided with a regulating device according to the invention, it is found that there are also determined five values representative of the offset of the band: one by inter -cage plus one downstream of the last stand of the rolling mill.
  • pseudo-sensors may make it possible to mitigate the failure of one or more sensors installed on the line when they fail during a production or when the signal transmitted is unusable because of the very conditions of the process. This may be the case in areas where descaling takes place, generating a dense vapor disrupting the operation of CCD cameras, for example.
  • This use can also limit the number of actual sensors installed on the line, thus reducing the cost of investment and maintenance of the device.
  • FIG. 3 there can be seen five series of curves representing a simulation of the offsets at the outlet of each roll stand of FIG. 2 (SOC1 to 5), as a function of time, for a first time. laminated strip according to the invention (upper curve) and a second laminated strip according to the prior art (lower curve), and a series of two curves representing the residual wedge at the exit of the rolling mill for the rolled strip according to the invention (curve upper) and the rolled strip according to the prior art (lower curve).
  • the offset of the strip is progressively controlled to reach a stable level, below the threshold of 10 mm, whereas the offset of the strip treated according to the prior art is not not stabilized and consistently exceeds 50 mm.
  • Figure 4 corresponding to the same simulations and takes up the upper five offset curves of the strip according to the invention, as a function of time. It also shows in the lower part the additional sway curves (DeltaSI at 5) imposed on each of the five stands of the rolling mill over time and which made it possible to obtain control of the offsets and the final wedge for the strip treated according to the invention. It is thus seen that by varying these additional skewings as a function of the offset values of each inter-cage, it is possible to rectify in final offsets significant existing initials due to heterogeneity due to the process. In doing so, one rectifies also the residual wedge which can also be at the origin of the localized offset.
  • the curve presented here represents the evolution of the offset at the level of each inter-cage when the process according to the invention is implemented (curve "with control") or according to the prior art (curve “without control”) . It is also verified that the method according to the invention allows a control of the offset which can thus be lowered from 37 to 10 mm in the final, when measured at 10 meters from the output of the finishing train. The method according to the prior art does not allow him to control the offset which increases steadily. Finally, there is a 63% reduced offset between the strip treated according to the invention and that treated according to the prior art, while the initial values of offset at the exit of the first cage were very close.
  • the invention is applicable, in the first place, to finishing mills for the hot rolling of steel strips. But it can find him applications on other types of rolling mills for metal strips having at least two cages in which the band is simultaneously under the influence. It will thus be possible to implement the invention for cold rolling or skin-pass metal strips, such as strips of steel or alloys ferrous or not, or even aluminum.

Abstract

The invention relates to a method for rolling a strip (B) inside a rolling mill for metal products that comprises at least two cages in which the strip (B) is simultaneously clamped, said method comprising: adjusting the side position of said strip (B) by simultaneously determining, downstream from each of the rolling mill in which the strip is clamped, a value representative of its side position along a line transverse to the movement direction, and calculating the algebraic deviations (?xp) between the side positions and the reference positions (6); based on said deviations (?xp), calculating the value (Sp) of the additional tilting to be applied to each of the rolling mill cages in which said strip (B) is clamped in order to reduce said algebraic deviations (?xp) under a predetermined threshold, the calculation of said additional tilting values (Sp) being carried out by multiplying said deviation values (?xp) by a K gain matrix determined by modelling the relations binding said deviation values (?xp) of the strip and said tiltings (Sp) of the support cylinders of the rolling mill; transmitting to each of the rolling mill cages the respective setpoint of additional tilting (Sp); and repeating these operations at predetermined time intervals until the strip (B) is no longer clamped in the last cage of the rolling mill. The invention also relates to a device for implementing this method, and to a rolling mill provided with at least one such device.

Description

PROCEDE DE LAMINAGE D'UNE BANDE METALLIQUE AVEC REGULATION DE SA POSITION LATERALE D'UNE BANDE ET LAMINOIR ADAPTE METHOD FOR ROLLING A METAL STRIP WITH REGULATION OF ITS LATERAL POSITION OF A BAND AND ADAPTED ROLLER
L'invention concerne le laminage des produits métallurgiques. Plus précisément, elle concerne la régulation du positionnement latéral des bandes métalliques, notamment en acier, à l'intérieur d'un laminoir. Habituellement, les bandes d'acier laminées à chaud sont fabriquées selon le schéma suivant:The invention relates to the rolling of metallurgical products. More specifically, it relates to the regulation of the lateral positioning of metal strips, in particular steel, inside a rolling mill. Usually, hot-rolled steel strips are manufactured according to the following scheme:
- coulée continue d'une brame d'épaisseur 200 à 240 mm;continuous casting of a slab of thickness 200 to 240 mm;
- réchauffage de la brame à une température d'environ 1100-12000C;- Heating the slab at a temperature of about 1100-1200 0 C;
- passage de la brame dans un laminoir dégrossisseur comportant une cage réversible unique ou une pluralité de cages indépendantes (par exemple au nombre de cinq) disposées les unes à la file des autres, de manière à obtenir une bande ayant une épaisseur de 30 à 50 mm environ;- Passage of the slab in a roughing mill comprising a single reversible cage or a plurality of independent cages (for example five in number) arranged one in line with another, so as to obtain a strip having a thickness of 30 to 50 about mm;
- passage de la bande dans un laminoir finisseur comportant une pluralité de cages (par exemple au nombre de six ou sept) dans lesquelles la bande est simultanément présente, de manière à lui conférer une épaisseur de 1 ,5 à 10 mm environ, puis mise de la bande sous forme d'une bobine.- Passage of the strip in a finishing mill comprising a plurality of cages (for example six or seven) in which the strip is simultaneously present, so as to give it a thickness of 1, 5 to 10 mm, and then put of the web in the form of a reel.
La bande laminée à chaud ainsi obtenue peut ensuite être soumise à des traitements thermomécaniques qui lui conféreront ses propriétés définitives, ou subir un laminage à froid qui réduira encore davantage son épaisseur avant l'accomplissement des ultimes traitements thermomécaniques.The hot-rolled strip thus obtained can then be subjected to thermomechanical treatments which will give it its final properties, or undergo a cold rolling which will further reduce its thickness before the completion of the final thermomechanical treatments.
Lors de son laminage, on observe des déports de bande à l'intérieur du laminoir finisseur, c'est à dire une déviation de la bande par rapport à sa trajectoire nominale entre deux cages. Cette déviation peut atteindre une trentaine de mm de part et d'autre de cette trajectoire nominale si rien n'est fait pour la compenser. Les déports de bande peuvent être à l'origine d'incidents tels que des froissements et des ruptures de la bande pendant le laminage, des refus d'engagement de la bande dans l'emprise des cylindres d'une cage du finisseur, un marquage des cylindres du laminoir suite à un choc avec la bande. Ces défauts peuvent être dus à l'état de la bande elle- même, ou aux perturbations mécaniques que son traitement dans des conditions anormales entraîne dans le fonctionnement du laminoir. De plus, le déport détériore l'homogénéité de l'épaisseur de la bande en sortie du laminoir finisseur. Enfin, il peut nuire à la bonne réalisation du bobinage de la bande.During its rolling, there are tape offsets inside the finishing mill, ie a deviation of the band from its nominal trajectory between two cages. This deviation can reach about thirty mm on either side of this nominal trajectory if nothing is done to compensate for it. Tape offsets can be the cause of incidents such as creasing and rupturing of the belt during rolling, refusal to engage the tape in the roll hold a cage of the finisher, a marking of the rolls of the rolling mill following an impact with the band. These defects may be due to the state of the band itself, or the mechanical disturbances that its treatment in abnormal conditions causes in the operation of the mill. In addition, the offset deteriorates the homogeneity of the thickness of the strip at the output of the finishing mill. Finally, it can hinder the successful realization of the winding of the band.
Ces déports de bande sont en outre à l'origine d'un défaut de forme appelé "sabre": une bande présentant ce défaut, au lieu d'être rectiligne, est cintrée dans un plan horizontal. Ce défaut est dû à l'existence d'un coin, c'est à dire d'une différence d'épaisseur entre les deux rives de la bande laminée, dont la cause peut être d'ordre thermique ou mécanique si le réchauffage ou le laminage n'ont pas été effectués de façon très homogène sur toute la largeur du produit.These band offsets are also at the origin of a defect form called "sword": a band with this defect, instead of being straight, is bent in a horizontal plane. This defect is due to the existence of a wedge, that is to say a difference in thickness between the two sides of the rolled strip, whose cause may be thermal or mechanical if the heating or rolling were not performed very homogeneously over the entire width of the product.
Les déports de bande peuvent être corrigés à l'aide de guides latéraux placés entre les cages du laminoir, contre lesquels la bande vient frotter lorsqu'elle s'écarte de sa trajectoire nominale, et qui la réorientent vers ladite trajectoire nominale. Mais lorsque le déport devient très important (en particulier en fin de laminage, lorsque la cage située juste en amont de la cage considérée a libéré la queue de la bande et la laisse donc libre de pivoter vers le côté de la cage où l'entrefer des cylindres est le plus grand), l'effort que les guides doivent exercer sur la bande provoque des frottements qui détériorent ses rives, allant parfois jusqu'à les replier sur elles-mêmes ou les arracher. De plus, les guides s'usent et doivent être périodiquement remplacés.The web offsets can be corrected by means of lateral guides placed between the roll stands, against which the strip comes rubbing when it deviates from its nominal path, and which reorient it towards said nominal path. But when the offset becomes very important (especially at the end of rolling, when the cage located just upstream of the cage considered released the tail of the band and therefore free to pivot to the side of the cage where the air gap cylinders is the largest), the effort that the guides must exert on the band causes friction that deteriorate its banks, sometimes going as far as folding them on themselves or pulling them off. In addition, the guides wear out and need to be replaced periodically.
Différents types de procédés ont été imaginés pour obtenir une régulation du phénomène de déport de la bande. Selon l'un de ces procédés (voir le document JP-A-4266414), on réalise une mesure de la différence entre les efforts exercés sur les deux extrémités des cylindres, et on considère que la valeur de cette différence est un indicateur de l'ampleur du déport. En conséquence, on réalise une augmentation du serrage exercé par les cylindres sur la bande du côté où a lieu le déport, en escomptant que cet accroissement localisé du serrage ramènera la bande vers sa position de référence (c'est à dire, généralement, en direction de l'axe du laminoir). Mais, cette mesure de différence d'efforts est sensible à d'autres facteurs que le déport de la bande, notamment à la valeur absolue du serrage, et on ne peut relier de manière rigoureuse sa valeur absolue à celle du déport. Et une fois l'augmentation du serrage réalisée sur l'un des côtés de la cage, il est difficile d'estimer quelles sont les parts respectives de cette modification du mode de serrage et de la réduction effective du déport dans la variation de la différence mesurée entre les efforts exercés sur les deux extrémités des cylindres. La mise en œuvre d'un tel procédé de régulation est donc délicate, car les actions correctrices qu'il entraîne peuvent ne pas être bien adaptées au but recherché, au point, parfois, d'aggraver le déport de bande que l'on voulait corriger. Un deuxième procédé de régulation du déport de bande consiste à mesurer directement le décentrement de la bande, comme cela est décrit dans DE-3837101. A cet effet, on place entre deux cages du laminoir un dispositif, tel qu'une caméra à diodes pourvue d'un référentiel, qui détermine la position absolue de la bande par rapport à l'axe du laminoir ou toute autre position de référence. D'après cette indication, on agit si nécessaire sur la différence entre les serrages exercés par les cylindres de cette cage sur les deux rives de la bande. Comme dans la méthode précédente, une augmentation du serrage sur le côté où a lieu le déport tend à ramener la bande dans sa position nominale. Ainsi, si on constate que la bande part vers la gauche, on modifie le serrage pour la dévier vers la droite. On peut utiliser un dispositif unique de mesure du décentrement de la bande ou une pluralité de tels dispositifs, placés chacun dans un espace inter-cages différent. Dans de tels dispositifs, l'application d'un différentiel de serrage additionnel prédéterminé qui sera appliqué à une cage de laminage ne dépend que de la détection qualitative de déport effectuée au moyen de la caméra associée à l'inter-cage en aval de cette cage. Un tel procédé est cependant fortement susceptible d'aggraver le déport de bande final, à la sortie du laminoir, car la détection du déport est réalisée de façon tardive par rapport à son apparition, ce qui limite pour le moins l'efficacité de la correction et la rend éventuellement contre-productive en cas de variation brutale du déport en amont de la cage concernée. En outre, ces méthodes ne permettent pas un réel contrôle de la valeur du déport, seule une correction approximative étant apportée. Le but de l'invention est de proposer un procédé de laminage d'une bande dans un laminoir de produits métalliques permettant de contrôler efficacement la position latérale de cette bande lors de son laminage et permettant d'agir avec plus de précision et de rapidité que les méthodes existantes, de manière à éviter les incidents de laminage. Un avantage supplémentaire serait d'obtenir une bande exempte de coin et par conséquent de sabre.Different types of processes have been devised to obtain a regulation of the phenomenon of offset of the band. According to one of these methods (see JP-A-4266414), a measurement is made of the difference between the forces exerted on the two ends of the rolls, and it is considered that the value of this difference is an indicator of the extent of the offset. Consequently, an increase in the clamping effect exerted by the rollers on the strip on the side where the offset takes place, while expecting that this localized increase in clamping will bring the strip back to its reference position (ie, generally, in direction of the axis of the rolling mill). However, this measurement of the difference in forces is sensitive to other factors than the offset of the band, especially to the absolute value of the tightening, and it is impossible to to link rigorously its absolute value to that of the offset. And once the increase of the tightening carried out on one of the sides of the cage, it is difficult to estimate what are the respective parts of this modification of the mode of tightening and the effective reduction of the offset in the variation of the difference measured between the forces exerted on the two ends of the cylinders. The implementation of such a regulation method is therefore delicate, because the corrective actions that it entails may not be well adapted to the desired goal, to the point, sometimes, to aggravate the offset of tape that one wanted correct. A second method of regulating the web offset is to directly measure the decentering of the web, as described in DE-3837101. For this purpose, a device, such as a diode camera provided with a reference frame, which determines the absolute position of the strip with respect to the axis of the rolling mill or any other reference position, is placed between two mill stands. According to this indication, one acts if necessary on the difference between the tightenings exerted by the rolls of this cage on both banks of the band. As in the previous method, an increase in clamping on the side where the offset takes place tends to bring the band back to its nominal position. Thus, if we see that the band goes to the left, we modify the tightening to deflect to the right. It is possible to use a single device for measuring the off-centering of the strip or a plurality of such devices, each placed in a different interspace. In such devices, the application of a predetermined additional clamping differential to be applied to a rolling stand depends only on the qualitative offset detection performed by means of the camera associated with the inter-cage downstream of this cage. Such a method is, however, highly likely to aggravate the final strip offset, at the exit of the rolling mill, because the detection of the offset is performed late in relation to its appearance, which limits at least the effectiveness of the correction. and possibly makes it counterproductive in case of sudden variation of the offset upstream of the cage concerned. In addition, these methods do not allow a real control of the value of the offset, only an approximate correction being made. The object of the invention is to propose a method for rolling a strip in a rolling mill of metal products that makes it possible to effectively control the lateral position of this strip during its rolling and that makes it possible to act more accurately and quickly than existing methods, so as to avoid rolling incidents. An additional advantage would be to obtain a band free of wedge and therefore saber.
A cet effet, l'invention a pour objet un procédé de laminage d'une bande à l'intérieur d'un laminoir de produits métalliques comportant au moins deux cages dans lesquelles ladite bande est simultanément sous emprise, selon lequel on régule la position latérale de ladite bande, ladite régulation comprenant les opérations suivantes :For this purpose, the subject of the invention is a method for rolling a strip inside a rolling mill of metal products comprising at least two cages in which said strip is simultaneously under the influence, according to which the lateral position is regulated. of said band, said regulation comprising the following operations:
- on détermine simultanément, en aval de chacune des cages du laminoir dans lesquelles ladite bande est en emprise, une valeur représentative de la position latérale de la bande selon une ligne transversale à sa direction de déplacement, et on calcule les écarts algébriques (Δxp) entre lesdites positions latérales et une position de référence ;at the same time, downstream of each of the mill stands, in which said strip is in line, a value representative of the lateral position of the strip along a line transverse to its direction of movement is determined, and the algebraic deviations (Δxp) are calculated; between said lateral positions and a reference position;
- à partir de ces écarts (Δxp), on calcule la valeur (Sp) du déhanchement additionnel à imposer à chacune desdites cages du laminoir dans lesquelles ladite bande (B) est en emprise, afin de ramener lesdits écarts algébriques (Δxp) en dessous d'un seuil prédéterminé, le calcul desdites valeurs (Sp) de déhanchements additionnels étant effectué en multipliant lesdites valeurs d'écarts (Δxp) par une matrice de gain K déterminée par modélisation des relations liant lesdites valeurs d'écarts (Δxp) de la bande et lesdits déhanchements (Sp) des cylindres de soutien du laminoir ;from these differences (Δxp), the value (Sp) of the additional skewness to be imposed on each of said mill stands in which said strip (B) is in line is calculated so as to reduce said algebraic gaps (Δxp) below a predetermined threshold, the calculation of said additional drift values (Sp) being performed by multiplying said difference values (Δxp) by a gain matrix K determined by modeling the relations linking said deviation values (Δxp) of the band and said swaying (Sp) of the rolling mill support rolls;
- on transmet à chacune desdites cages de laminoir la consigne de déhanchement additionnel (Sp) respective, - et on renouvelle lesdites opérations à intervalles de temps prédéterminés, jusqu'à ce que ladite bande ne soit plus sous l'emprise de la dernière cage dudit laminoir. Le procédé selon l'invention peut en outre comprendre les caractéristiques optionnelles suivantes, prises isolément ou en combinaison :each of said rolling mill stands is given the respective additional setback instruction (Sp), and said operations are repeated at predetermined time intervals, until said band is no longer under the influence of the last stand of said rolling mill. The method according to the invention may further comprise the following optional features, taken alone or in combination:
- la position de référence est choisie de telle sorte que le coin de la bande soit nul, - la matrice de gain K est déterminée en prenant en compte au moins un paramètre de réglage initial du procédé de laminage et au moins une caractéristique de la bande (B) à laminer,the reference position is chosen so that the corner of the strip is zero, the gain matrix K is determined by taking into account at least one initial adjustment parameter of the rolling method and at least one characteristic of the strip; (B) rolling,
- la matrice de gain K est constante jusqu'à ce que la bande ne soit plus sous l'emprise que de la première cage du laminoir, - la valeur calculée de position latérale de la bande est obtenue en utilisant les paramètres de la matrice de gain K,the gain matrix K is constant until the strip is no longer under the influence of the first roll stand, the calculated lateral position value of the strip is obtained by using the parameters of the roll matrix; K gain,
- au moins deux des valeurs représentatives de la position latérale de la bande sont des valeurs fournies par des capteurs placés en aval des cages de laminoir correspondantes, - au moins une des valeurs représentatives de la position latérale de la bande est une valeur calculée à partir des valeurs fournies par lesdits capteurs placés en aval des autres cages de laminoir, les autres valeurs représentatives étant les valeurs fournies par les capteurs, - toutes les valeurs représentatives de la position latérale de la bande sont des valeurs mesurées par les capteurs, au nombre de un en aval de chaque cage du laminoir.at least two of the values representative of the lateral position of the strip are values provided by sensors placed downstream of the corresponding rolling mill stands; at least one of the values representative of the lateral position of the strip is a value calculated from values provided by said sensors placed downstream of the other rolling stands, the other representative values being the values provided by the sensors, - all the values representative of the lateral position of the strip are values measured by the sensors, the number of one downstream of each roll stand.
- les valeurs fournies par les capteurs sont obtenues par filtrage du signal brut d'acquisition, le filtrage prenant en compte les valeurs calculées d'écarts (Δxp) entre les positions latérales de la bande et la position de référence,the values provided by the sensors are obtained by filtering the raw acquisition signal, the filtering taking into account the calculated values of deviations (Δxp) between the lateral positions of the band and the reference position,
- lorsqu'un déhanchement additionnel (Sp) à imposer est inférieur à un seuil prédéterminé, aucune consigne de déhanchement additionnel n'est transmise à la cage concernée. - lorsque la bande n'est plus sous l'emprise de la première cage du laminoir, on régule à la fois la position latérale de la partie de la bande encore sous l'emprise d'au moins deux cages du laminoir et l'angle de pivotement par rapport à l'axe de laminage de la queue de la bande, en calculant et en transmettant une valeur de déhanchement additionnel à chaque cage sous laquelle la bande est encore présente,- When an additional skew (Sp) to be imposed is less than a predetermined threshold, no additional skew instruction is transmitted to the cage concerned. when the band is no longer under the influence of the first stand of the rolling mill, both the lateral position of the part of the strip still under the influence of at least two stands of the rolling mill is regulated and the angle pivoting with respect to the rolling axis of the tail of the band, by calculating and transmitting an additional skew value to each cage under which the band is still present,
- pour chaque cage, on détermine la valeur de déhanchement additionnel à appliquer en utilisant une valeur représentative de l'angle de pivotement de la queue de bande à l'entrée de la cage,for each cage, the additional skew value to be applied is determined by using a value representative of the angle of rotation of the tail of the strip at the entrance of the cage,
- on calcule la valeur représentative dudit angle de pivotement au moyen de valeurs représentatives de la position latérale de la bande selon une ligne transversale à sa direction de déplacement, dans lesdites cages en emprise avec la bande, lesdites valeurs représentatives étant obtenues suivant l'invention.the value representative of said pivot angle is calculated by means of values representative of the lateral position of the strip along a line transverse to its direction of displacement, in said cages in line with the strip, said representative values being obtained according to the invention; .
L'invention a également pour objet un dispositif de régulation de la position latérale d'une bande à l'intérieur d'un laminoir de produits métalliques comportant au moins deux cages dans lesquelles la bande est simultanément sous emprise et comprenant:The invention also relates to a device for regulating the lateral position of a strip inside a rolling mill of metal products comprising at least two cages in which the strip is simultaneously under the influence and comprising:
- au moins deux capteurs fournissant un signal brut d'acquisition permettant la détermination de valeurs représentatives de la position latérale de la bande selon une ligne transversale à sa direction de déplacement en aval d'au moins deux cages du laminoir,at least two sensors providing a raw acquisition signal enabling the determination of values representative of the lateral position of the strip in a line transverse to its direction of movement downstream of at least two roll stands;
- des moyens pour déterminer les écarts algébriques (Δxp) entre les valeurs représentatives et une position de référence,means for determining the algebraic deviations (Δxp) between the representative values and a reference position,
- des moyens de calcul de la valeur (Sp) du déhanchement additionnel à imposer à chacune des cages du laminoir, à partir des écarts (Δxp), afin de ramener les écarts algébriques (Δxp) en dessous d'un seuil prédéterminé,means for calculating the value (Sp) of the additional skewn to be imposed on each of the stands of the rolling mill, from the gaps (Δxp), in order to reduce the algebraic deviations (Δxp) below a predetermined threshold,
- des moyens de calcul d'une matrice de gain K qui permet d'obtenir les valeurs (Sp) de déhanchements additionnels par multiplication de la matrice K avec les valeurs d'écarts (Δxp), etmeans for calculating a gain matrix K which makes it possible to obtain the additional drift values (Sp) by multiplication of the matrix K with the values of deviations (Δxp), and
- des moyens pour transmettre la consigne de déhanchement additionnel (Sp) respective à chacune des cages de laminoir, à intervalles de temps prédéterminés. Le dispositif selon l'invention peut en outre comprendre des moyens de filtrage du signal brut d'acquisition des capteurs.means for transmitting the respective additional deskew instruction (Sp) to each of the rolling mill stands, at predetermined time intervals. The device according to the invention may further comprise means for filtering the raw signal for acquiring the sensors.
L'invention a également pour objet un dispositif de régulation de la position de la queue d'une bande à l'intérieur d'un laminoir de produits métalliques comportant au moins deux cages, comprenant :The invention also relates to a device for regulating the position of the tail of a strip inside a rolling mill of metal products comprising at least two cages, comprising:
- des moyens de calcul de l'angle de pivotement de la queue de bande avec l'axe de laminage,means for calculating the angle of rotation of the tail of the strip with the rolling axis,
- des moyens de calcul de la valeur du déhanchement additionnel à imposer à chacune des cages du laminoir, afin de ramener la valeur de l'angle de pivotement en dessous d'un seuil prédéterminé, etmeans for calculating the value of the additional swaying to be imposed on each of the stands of the rolling mill, in order to reduce the value of the pivot angle below a predetermined threshold, and
- des moyens pour transmettre la consigne de déhanchement additionnel (Sp) respective à chacune des cages de laminoir, à intervalles de temps prédéterminés.means for transmitting the respective additional deskew instruction (Sp) to each of the rolling mill stands, at predetermined time intervals.
L'invention concerne enfin un laminoir de produits métalliques sous forme de bandes du type comportant au moins deux cages et au moins un dispositif de régulation de la position latérale de la bande du type selon l'invention. Ce laminoir peut en outre inclure au moins un dispositif de régulation de la position de la queue de la bande selon l'invention.The invention finally relates to a rolling mill of metal products in the form of strips of the type comprising at least two cages and at least one device for regulating the lateral position of the band of the type according to the invention. This mill may further include at least one device for regulating the position of the tail of the strip according to the invention.
Le laminoir selon l'invention peut en outre comprendre les caractéristiques optionnelles suivantes, prises isolément ou en combinaison : - le laminoir peut être un laminoir finisseur pour le laminage à chaud de bandes d'acierThe rolling mill according to the invention may further comprise the following optional characteristics, taken separately or in combination: the mill may be a finishing mill for the hot rolling of steel strips
- le laminoir peut comprendre deux, cinq, six ou sept cages de laminage.the rolling mill may comprise two, five, six or seven rolling stands.
- le laminoir peut être 'un laminoir pour le laminage à froid ou le skin- pass de bandes d'acier.the rolling mill may be a rolling mill for cold rolling or skinpassing of steel strips.
Comme on l'aura compris, l'invention consiste tout d'abord à contrôler le déport de la bande par l'imposition d'un déhanchement additionnel à chaque cage du laminoir entre lesquelles la bande est en traction, chaque déhanchement étant calculé à partir de valeurs représentatives du déport de la bande dans toutes les zones inter-cages. Ce procédé permet ainsi d'allier efficacité et rapidité du contrôle, sans risque pour la bande et pour le laminoir. On entend ici par déhanchement le différentiel de positionnement des organes de serrage entre le côté « opérateur » et le côté « moteur ». Cette valeur de déhanchement peut se régler en serrant plus ou moins les extrémités des rouleaux de soutien.As will have been understood, the invention consists first of all in controlling the offset of the strip by the imposition of an additional skew at each roll stand between which the strip is in tension, each sway being calculated from representative values of the offset of the strip in all inter-cage areas. This process allows to combine efficiency and speed of control, without risk for the band and the mill. Here is meant by swaying the positioning differential of the clamping members between the "operator" side and the "motor" side. This skew value can be adjusted by squeezing the ends of the support rolls more or less.
L'invention sera mieux comprise à la lecture de la description qui suit, donnée en référence aux figures annexées :The invention will be better understood on reading the description which follows, given with reference to the appended figures:
- Fig.1 : schéma d'un laminoir à deux cages équipé d'un dispositif de régulation selon l'invention,- Fig.1: diagram of a rolling mill with two cages equipped with a control device according to the invention,
- Fig.2 : schéma d'un laminoir à cinq cages équipé d'un dispositif de régulation selon l'invention, - Fig.3 : cinq courbes représentant une simulation des déports à la sortie de chaque cage du laminoir de la figure 2 en fonction du temps pour une première bande laminée selon l'invention et une seconde bande laminée selon l'art antérieur, et une courbe représentant le coin résiduel à la sortie du laminoir pour ces deux bandes,FIG. 2: diagram of a rolling mill with five stands equipped with a regulating device according to the invention; FIG. 3: five curves representing a simulation of offsets at the outlet of each roll stand of the rolling mill of FIG. time function for a first laminated strip according to the invention and a second laminated strip according to the prior art, and a curve representing the residual wedge at the exit of the rolling mill for these two strips,
- - Fig.4 : première courbe représentant une simulation de l'évolution des déports en sortie de chaque cage du laminoir de la figure 2, en fonction du temps et seconde courbe représentant les valeurs de déhanchements additionnels appliquées à chaque cage ayant permis d'obtenir les écarts présentés à la première courbe,- - Fig.4: first curve representing a simulation of the evolution of the offsets at the output of each roll of the mill of Figure 2, as a function of time and second curve representing the values of additional skewings applied to each cage that allowed to get the deviations presented at the first curve,
- Fig. 5 : courbe représentant l'évolution du déport au niveau de chaque inter-cage lorsque le procédé selon l'invention est mis en œuvre (courbe « avec contrôle » ou selon l'art antérieur (courbe « sans contrôle »). La figure 1 montre une bande métallique B en train d'être laminée dans un laminoir comprenant deux cages 1 , 2 dans lesquelles la bande B est simultanément sous emprise, par exemple un laminoir finisseur pour le laminage à chaud des bandes d'acier. Les laminoirs de ce type comportent généralement 5, 6 ou 7 cages. Chacune cage 1 , 2 comprend, classiquement, deux cylindres de travail 1a, 1a1, 2a, 2a1 et deux cylindres de soutien 1b, 1b', 2b, 2b1.- Fig. 5: curve representing the evolution of the offset at each inter-cage when the method according to the invention is implemented (curve "with control" or according to the prior art (curve "without control"). shows a metal strip B being rolled in a rolling mill comprising two cages 1, 2 in which the strip B is simultaneously under the influence, for example a finishing mill for the hot rolling of the steel strips. type include usually 5, 6 or 7 cages. Each cage 1, 2 comprises, conventionally, two working rolls 1a, 1a 1 , 2a, 2a 1 and two support rolls 1b, 1b ', 2b, 2b 1 .
Selon l'invention, un premier capteur 4 (tel qu'une caméra à diodes, ou tout autre appareil de fonction équivalente) qui acquiert un signal brut permettant in fine de déterminer une valeur représentative de la position de la bande B, selon une ligne transversale à sa direction de déplacement, entre la cage 1 et la cage 2, et un deuxième capteur 5 similaire au précédent, qui effectue la même opération en aval de la cage 2. En pointillés 6, on a représenté une position de référence que devrait normalement occuper la bande B en l'absence de déport. Cette position de référence est généralement centrée sur l'axe géométrique théorique du laminoir. Il peut cependant être avantageux de choisir une position de référence différente afin de minimiser le coin résiduel de la bande B à la sortie du laminoir. Cela pourra en particulier être le cas lorsque l'axe géométrique du laminoir ne coïncide pas avec l'axe selon lequel a réellement lieu le laminage. Quoi qu'il en soit, il a été vérifié que la détermination de cette position de référence n'a pas d'influence sur le contrôle du déport de la bande, mais uniquement sur le coin résiduel. Cette position de référence 6 est mise en mémoire dans une première unité de traitement 7 vers laquelle sont envoyés les signaux bruts recueillis par les capteurs 4, 5, et cette première unité de traitement 7 détermine les valeurs des écarts algébriques Δx1 et Δx2 entre les positions de la bande B enregistrées respectivement par les capteurs 4 et 5 et la position de référence 6.According to the invention, a first sensor 4 (such as a diode camera, or any other apparatus of equivalent function) which acquires a raw signal allowing in fine to determine a value representative of the position of the band B, according to a line transverse to its direction of displacement, between the cage 1 and the cage 2, and a second sensor 5 similar to the previous one, which performs the same operation downstream of the cage 2. In dotted lines 6, there is shown a reference position that should normally occupy band B in the absence of offset. This reference position is generally centered on the theoretical geometric axis of the rolling mill. However, it may be advantageous to choose a different reference position to minimize the residual wedge of the strip B at the exit of the rolling mill. This may in particular be the case when the geometric axis of the rolling mill does not coincide with the axis in which the rolling actually takes place. In any case, it has been verified that the determination of this reference position has no influence on the control of the offset of the strip, but only on the residual corner. This reference position 6 is stored in a first processing unit 7 to which are sent the raw signals collected by the sensors 4, 5, and this first processing unit 7 determines the values of the algebraic deviations Δx1 and Δx2 between the positions of the band B recorded respectively by the sensors 4 and 5 and the reference position 6.
En fonction du type de capteur 4, 5 utilisé, l'unité de traitement 7 pourra avoir à traiter le signal brut du capteur pour obtenir une valeur représentative de la position de la bande (B). Ainsi, si les capteurs 4, 5 sont des caméras matricielles de type CCD, le signal d'acquisition est constitué d'une image de la zone couverte par la caméra. Afin de positionner la bande B1 on pourra alors traiter le signal à l'aide de logiciels appropriés pour filtrer les pixels actifs et pour détecter les contours de la bande B et ainsi déterminer sa position latérale. Les capteurs 4 et 5 seront, de préférence, positionnés perpendiculairement à leurs zones de mesures respectives et devront être fixés sur des supports indépendants des laminoirs, présentant le moins de vibrations possible. De manière avantageuse, on pourra utiliser le capteur 5 à la fois pour contrôler le déport de la bande B, mais aussi pour mesurer sa largeur à la sortie du laminoir.Depending on the type of sensor 4, 5 used, the processing unit 7 may have to process the raw signal of the sensor to obtain a value representative of the position of the strip (B). Thus, if the sensors 4, 5 are matrix cameras of the CCD type, the acquisition signal consists of an image of the area covered by the camera. In order to position the band B 1, the signal can then be processed using appropriate software for filtering the active pixels and for detecting the contours of the band B and thus determining its lateral position. The sensors 4 and 5 will preferably be positioned perpendicular to their respective measurement zones and will have to be fixed on independent supports of the rolling mills, presenting the least possible vibration. Advantageously, the sensor 5 can be used both to control the offset of the strip B, but also to measure its width at the exit of the rolling mill.
Les valeurs calculées de Δx1 et Δx2 sont ensuite transmises à une deuxième unité de traitement 8 qui calcule les valeurs de déhanchement additionnel S1 et S2 devant être imposées aux cages 1 et 2. Le calcul de S1 et S2 est réalisé en multipliant les valeurs de Δx1 etThe calculated values of Δx1 and Δx2 are then transmitted to a second processing unit 8 which calculates the additional sway values S1 and S2 to be imposed on the cages 1 and 2. The calculation of S1 and S2 is performed by multiplying the values of Δx1 and
Δx2 par une matrice de gain K. Une troisième unité de traitement 9 a pour fonction de déterminer cette matrice de gain K qui sera transmise à l'unité de calcul 8.Δx2 by a gain matrix K. A third processing unit 9 has the function of determining this gain matrix K which will be transmitted to the calculation unit 8.
La matrice de gain K est obtenue par modélisation des relations liant les déports de la bande et les déhanchements des cylindres de soutien du laminoir.The gain matrix K is obtained by modeling the relations linking the offsets of the strip and the shaking of the rolls of support of the rolling mill.
Elle pourra notamment être déterminée par des essais préalables à la production proprement dite.It may in particular be determined by tests prior to actual production.
Cette modélisation pourra tenir compte d'une ou plusieurs grandeurs caractéristiques du procédé de laminage, telles que la largeur des cylindres, l'effort de laminage, la vitesse de rotation des cylindres de travail, etc..This modeling may take into account one or more quantities characteristic of the rolling process, such as the width of the rolls, the rolling force, the rotational speed of the work rolls, etc.
Elle pourra également tenir compte d'une ou plusieurs caractéristiques de la bande à laminer, telles que l'épaisseur de la bande à l'entrée du laminoir, sa dureté, sa température, etc.. On pourra ainsi utiliser des matrices moyennes déterminées grâce au laminage de produits différents, représentatifs du carnet de production ou bien encore des matrices spécifiques à un produit particulier, ce qui permet de gagner en précision.It may also take into account one or more characteristics of the strip to be rolled, such as the thickness of the strip at the entrance of the mill, its hardness, its temperature, etc. It will thus be possible to use average matrices determined by rolling different products, representative of the production booklet or even specific matrices for a particular product, which allows to gain in precision.
La matrice de gain K reste constante pendant le procédé de laminage d'une bande B1 au moins tant que la bande reste sous l'emprise de la première cage de laminoir, seules les valeurs représentatives du déport de la bande étant alors modifiées à chaque nouveau cycle d'acquisition de données des capteurs 4 et 5. Lorsque la bande quitte l'emprise de la première cage de laminoir, on pourra utiliser une matrice de gain modifiée tenant compte du fait que la bande n'est plus sous l'emprise que de N-1 cages, si n est le nombre total de cage. De même, on pourra changer de matrice de gain au fur et à mesure que la bande quitte les emprises successives des cages du laminoir, pour un meilleur contrôle du déport.The gain matrix K remains constant during the rolling process of at least one band B 1 as long as the band remains under the influence of the first rolling mill stand, only the values representative of the offset of the band being then modified at each new data acquisition cycle of sensors 4 and 5. When the tape leaves the grip of the first cage of rolling mill, we can use a modified gain matrix taking into account that the band is no longer under the influence of N-1 cages, if n is the total number of cage. Likewise, it will be possible to change the gain matrix as the strip leaves the successive areas of the rolling mill stands, for better control of the offset.
Les valeurs des consignes de serrage S1 et S2 peuvent ensuite être transmises à des moyens 10 de transmission des consignes que l'on va imposer aux actionneurs commandant le déhanchement des cages 1 et 2 (qui sont d'un type connu en eux-mêmes et non représentés sur la figure 1). Le procédé selon l'invention permet de contrôler les déports latéraux de la bande par rapport à sa position nominale et de passer sous le seuil des 10 mm, alors que les procédés de l'art antérieur ne permettent pas de passer sous le seuil des 20 mm.The values of the tightening instructions S1 and S2 can then be transmitted to means 10 for transmitting the instructions that will be imposed on the actuators controlling the dishing of the cages 1 and 2 (which are of a type known in themselves and not shown in Figure 1). The method according to the invention makes it possible to control the lateral offsets of the strip with respect to its nominal position and to pass below the threshold of 10 mm, whereas the methods of the prior art do not make it possible to go below the threshold of 20 mm. mm.
Lorsque le calcul des déhanchements S1 et S2 à imposer aux cages de laminoir aboutirait à des valeurs inférieures à un seuil prédéterminé, on pourra prévoir qu'aucune consigne n'est transmise aux moyens 10. Il en est en particulier ainsi lorsque le déport attendu à la suite de la mise en oeuvre des déhanchements additionnels S1 et S2 ne dépasse pas 2 mm, par exemple. Le cycle de régulation pourra être renouvelé toutes les 50 ou 100 ms, par exemple, la fréquence étant de préférence choisie pour assurer une bonne stabilité de la régulation.When the calculation of the swayings S1 and S2 to be imposed on the rolling mill stands would result in values lower than a predetermined threshold, it can be provided that no setpoint is transmitted to the means 10. This is particularly the case when the offset expected at following the implementation of the additional shake S1 and S2 does not exceed 2 mm, for example. The regulation cycle may be renewed every 50 or 100 ms, for example, the frequency being preferably chosen to ensure good stability of the regulation.
Les modèles mathématiques utilisés pour relier le déport et le déhanchement additionnel à imposer aux cages de laminoir étant valables tant que la bande considérée est sous traction entre deux cages, on pourra continuer à contrôler la position latérale de la bande jusqu'à ce que celle-ci ne soit plus sous l'emprise que de la dernière cage. On contrôle alors uniquement la position latérale de la partie de la bande encore sous l'emprise d'au moins deux cages du laminoir, qu'on appelle encore « corps de bande », en agissant bien sur uniquement sur les cages sous lesquelles la bande est encore présente.The mathematical models used to connect the offset and the additional skew to be imposed on the mill stands being valid as long as the band under consideration is under tension between two stands, it will be possible to continue to control the lateral position of the band until that it is no longer under the influence of the last cage. Then only the lateral position of the part of the belt still under the influence of at least two mill stands, which is still called the "belt body", is controlled by acting of course only on the cages under which the belt is still present.
On pourra alors avantageusement contrôler simultanément la partie de la bande en amont du corps de bande, qu'on appelle encore « queue de bande ». En effet, cette partie de la bande est susceptible de pivoter par rapport à l'axe de laminage et peut même former des plis venant endommager les cylindres de travail du laminoir.It will then advantageously be possible to simultaneously control the portion of the strip upstream of the strip body, which is still called a "strip tail". Indeed, this part of the band is likely to rotate by relative to the rolling axis and can even form folds that damage the working rolls of the rolling mill.
Pour la réguler, on pourra tout d'abord calculer une valeur de l'angle de pivotement en amont de chaque cage, en utilisant de préférence les valeurs représentatives du déport du corps de bande acquises ou calculées précédemment. On réalise alors un nouveau pseudo-capteur sans équipement supplémentaire.To regulate it, it will be possible first of all to calculate a value of the pivoting angle upstream of each cage, preferably using the representative values of the offset of the band body acquired or calculated previously. A new pseudo-sensor is then realized without additional equipment.
A partir des valeurs représentatives du déport du corps de bande dans chaque inter-cage et de l'angle de pivotement de la queue de bande en amont de chaque cage, on peut alors déterminer la valeur du déhanchement additionnel global à imposer aux cages sous lesquelles la bande est encore présente, afin de contrôler à la fois les angles de pivotement de la queue de bande et la position latérale du corps de bande dans chaque intercage.From the representative values of the offset of the band body in each inter-cage and the angle of rotation of the tail of the strip upstream of each cage, it is then possible to determine the value of the overall additional skew to be imposed on the cages under which the band is still present, in order to control both the pivot angles of the band tail and the lateral position of the band body in each intercage.
Si on considère à présent la figure 2 qui représente schématiquement un laminoir à cinq cages muni d'un dispositif de régulation selon l'invention, on constate que l'on détermine là-aussi cinq valeurs représentatives du déport de la bande : une par inter-cage plus une en aval de la dernière cage du laminoir.If we now consider Figure 2 which shows schematically a rolling mill with five cages provided with a regulating device according to the invention, it is found that there are also determined five values representative of the offset of the band: one by inter -cage plus one downstream of the last stand of the rolling mill.
Afin de contrôler efficacement le déport de la bande dans les zones où elle est en traction entre deux cages, les présents inventeurs ont constaté qu'il était nécessaire de disposer d'au moins deux capteurs réels pouvant donner un signal représentatif de la position de la bande dans l'inter-cage correspondant.In order to effectively control the offset of the strip in the areas where it is in tension between two cages, the present inventors have found that it was necessary to have at least two real sensors that can give a signal representative of the position of the band in the corresponding inter-cage.
Cependant, ils ont également constaté qu'il était possible d'utiliser ces données fournies par les au moins deux capteurs réels présents pour reconstituer des valeurs représentatives du déport de la bande dans les autres inter-cages, à la manière de pseudo-capteurs.However, they also found that it was possible to use these data provided by the at least two real sensors present to reconstruct values representative of the offset of the band in the other inter-cages, in the manner of pseudo-sensors.
En fonction du nombre de pseudo-capteurs et de leur emplacement sur la ligne de laminage, les résultats en termes de contrôle du déport de la bande sont équivalents ou très légèrement dégradés par rapport au contrôle obtenu avec un capteur réel par inter-cage.Depending on the number of pseudo-sensors and their location on the rolling line, the results in terms of control of the offset of the band are equivalent or very slightly degraded compared to the control obtained with a real sensor by inter-cage.
L'utilisation de ces pseudo-capteurs peut permettre de pallier la défaillance d'un ou plusieurs capteurs installés sur la ligne lorsque ceux-ci tombent en panne lors d'une production ou lorsque le signal transmis est inexploitable en raison des conditions mêmes du procédé. Il peut en aller ainsi dans les zones où un décalaminage a lieu, générant une vapeur dense perturbant le fonctionnement de caméras CCD, par exemple.The use of these pseudo-sensors may make it possible to mitigate the failure of one or more sensors installed on the line when they fail during a production or when the signal transmitted is unusable because of the very conditions of the process. This may be the case in areas where descaling takes place, generating a dense vapor disrupting the operation of CCD cameras, for example.
Cette utilisation peut également permettre de limiter le nombre de capteurs réels installés sur la ligne, diminuant ainsi le coût d'investissement et de maintenance du dispositif.This use can also limit the number of actual sensors installed on the line, thus reducing the cost of investment and maintenance of the device.
Lorsque l'on met en œuvre le procédé de laminage selon l'invention dans un laminoir comportant cinq cages et plus, on préfère ne pas imposer de déhanchement additionnel à la dernière cage de laminoir, par mesure de sécurité, car il n'est plus possible de rectifier le déport de la partie de la bande sortant du laminoir en cas d'anomalie due à l'équipement, par exemple.When implementing the rolling method according to the invention in a rolling mill with five or more stands, it is preferred not to impose additional skew on the last roll stand, for safety reasons, since it is no longer It is possible to rectify the offset of the part of the strip coming out of the rolling mill in case of anomaly due to the equipment, for example.
Si l'on considère à présent la figure 3, on peut y voir cinq séries de courbes représentant une simulation des déports à la sortie de chaque cage du laminoir de la figure 2 (SOC1 à 5), en fonction du temps, pour une première bande laminée selon l'invention (courbe supérieure) et une seconde bande laminée selon l'art antérieur (courbe inférieure), et une série de deux courbes représentant le coin résiduel à la sortie du laminoir pour la bande laminée selon l'invention (courbe supérieure) et la bande laminée selon l'art antérieur (courbe inférieure). On constate qu'avec le procédé selon l'invention, le déport de la bande est progressivement contrôlé pour atteindre un niveau stable, en dessous du seuil de 10 mm, tandis que le déport de la bande traitée selon l'art antérieur n'est pas stabilisé et dépasse systématiquement les 50 mm.Referring now to FIG. 3, there can be seen five series of curves representing a simulation of the offsets at the outlet of each roll stand of FIG. 2 (SOC1 to 5), as a function of time, for a first time. laminated strip according to the invention (upper curve) and a second laminated strip according to the prior art (lower curve), and a series of two curves representing the residual wedge at the exit of the rolling mill for the rolled strip according to the invention (curve upper) and the rolled strip according to the prior art (lower curve). It can be seen that with the method according to the invention, the offset of the strip is progressively controlled to reach a stable level, below the threshold of 10 mm, whereas the offset of the strip treated according to the prior art is not not stabilized and consistently exceeds 50 mm.
La courbe représentant la simulation de coin est elle-aussi parlante puisqu'on obtient un coin nul pour la bande traitée selon l'invention, tandis que le coin est important et irrégulier pour la bande traitée selon l'art antérieur.The curve representing the corner simulation is also speaking since a zero wedge is obtained for the strip treated according to the invention, whereas the corner is large and irregular for the strip treated according to the prior art.
La figure 4 correspondant aux mêmes simulations et reprend en partie supérieure les cinq courbes de déport de la bande selon l'invention, en fonction du temps. Elle montre également en partie inférieure les courbes de déhanchements additionnels (DeltaSI à 5) imposés à chacune des cinq cages du laminoir au cours du temps et qui ont permis d'obtenir le contrôle des déports et du coin final pour la bande traitée selon l'invention. On voit ainsi qu'en faisant varier ces déhanchements additionnels en fonction des valeurs de déport de chaque inter-cage, on peut réussir à rectifier en final des déports initiaux importants existants en raison d'hétérogénéité dues au procédé. Ce faisant, on rectifie également le coin résiduel qui peut d'ailleurs être à l'origine du déport localisé.Figure 4 corresponding to the same simulations and takes up the upper five offset curves of the strip according to the invention, as a function of time. It also shows in the lower part the additional sway curves (DeltaSI at 5) imposed on each of the five stands of the rolling mill over time and which made it possible to obtain control of the offsets and the final wedge for the strip treated according to the invention. It is thus seen that by varying these additional skewings as a function of the offset values of each inter-cage, it is possible to rectify in final offsets significant existing initials due to heterogeneity due to the process. In doing so, one rectifies also the residual wedge which can also be at the origin of the localized offset.
On a ensuite procédé à un essai en conditions réelles du procédé de laminage selon l'invention sur un laminoir finisseur à cinq cages, dont les résultats sont représentés sur la figure 5.Then, a real-life test of the rolling process according to the invention was carried out on a rolling mill with five stands, the results of which are shown in FIG.
La courbe qui y est présentée représente l'évolution du déport au niveau de chaque inter-cage lorsque le procédé selon l'invention est mis en œuvre (courbe « avec contrôle ») ou selon l'art antérieur (courbe « sans contrôle »). On vérifie là-aussi que le procédé selon l'invention permet un contrôle du déport qui peut ainsi être abaissé de 37 à 10 mm en final, lorsqu'on le mesure à 10 mètres de la sortie du train finisseur. Le procédé selon l'art antérieur ne permet quant à lui pas de contrôler le déport qui augmente régulièrement. En final, on observe un déport réduit de 63% entre la bande traitée selon l'invention et celle traitée selon l'art antérieur, alors que les valeurs initiales de déport à la sortie de la première cage étaient très proches.The curve presented here represents the evolution of the offset at the level of each inter-cage when the process according to the invention is implemented (curve "with control") or according to the prior art (curve "without control") . It is also verified that the method according to the invention allows a control of the offset which can thus be lowered from 37 to 10 mm in the final, when measured at 10 meters from the output of the finishing train. The method according to the prior art does not allow him to control the offset which increases steadily. Finally, there is a 63% reduced offset between the strip treated according to the invention and that treated according to the prior art, while the initial values of offset at the exit of the first cage were very close.
L'invention est applicable, en premier lieu, sur les laminoirs finisseurs pour le laminage à chaud des bandes d'acier. Mais on peut lui trouver des applications sur d'autres types de laminoirs pour bandes métalliques comportant au moins deux cages dans lesquelles la bande est simultanément sous emprise. On pourra ainsi mettre en œuvre l'invention pour le laminage à froid ou le skin-pass de bandes métalliques, telles que des bandes d'acier ou d'alliages ferreux ou non, ou bien encore d'aluminium. The invention is applicable, in the first place, to finishing mills for the hot rolling of steel strips. But it can find him applications on other types of rolling mills for metal strips having at least two cages in which the band is simultaneously under the influence. It will thus be possible to implement the invention for cold rolling or skin-pass metal strips, such as strips of steel or alloys ferrous or not, or even aluminum.

Claims

REVENDICATIONS
1. Procédé de laminage d'une bande (B) à l'intérieur d'un laminoir de produits métalliques comportant au moins deux cages dans lesquelles ladite bande (B) est simultanément sous emprise, selon lequel on régule la position latérale de ladite bande (B), ladite régulation comprenant les opérations suivantes :1. A method of rolling a strip (B) inside a rolling mill of metal products comprising at least two cages in which said strip (B) is simultaneously under the influence, which regulates the lateral position of said strip (B), said regulation comprising the following operations:
- on détermine simultanément, en aval de chacune des cages du laminoir dans lesquelles ladite bande (B) est en emprise, une valeur représentative de la position latérale de la bande (B) selon une ligne transversale à sa direction de déplacement, et on calcule les écarts algébriques (Δxp) entre lesdites positions latérales et une position de référence (6);at the same time, downstream of each of the mill stands, in which said strip (B) is in line, a value representative of the lateral position of the strip (B) along a line transverse to its direction of displacement, and calculates the algebraic deviations (Δxp) between said lateral positions and a reference position (6);
- à partir de ces écarts (Δxp), on calcule la valeur (Sp) du déhanchement additionnel à imposer à chacune desdites cages du laminoir dans lesquelles ladite bande (B) est en emprise, afin de ramener lesdits écarts algébriques (Δxp) en dessous d'un seuil prédéterminé, le calcul desdites valeurs (Sp) de déhanchements additionnels étant effectué en multipliant lesdites valeurs d'écarts (Δxp) par une matrice de gain K déterminée par modélisation des relations liant lesdites valeurs d'écarts (Δxp) de la bande et lesdits déhanchements (Sp) des cylindres de soutien du laminoir ;from these differences (Δxp), the value (Sp) of the additional skewness to be imposed on each of said mill stands in which said strip (B) is in line is calculated so as to reduce said algebraic gaps (Δxp) below a predetermined threshold, the calculation of said additional drift values (Sp) being performed by multiplying said difference values (Δxp) by a gain matrix K determined by modeling the relations linking said deviation values (Δxp) of the band and said swaying (Sp) of the rolling mill support rolls;
- on transmet à chacune desdites cages de laminoir la consigne de déhanchement additionnel (Sp) respective, - et on renouvelle lesdites opérations à intervalles de temps prédéterminés, jusqu'à ce que ladite bande (B) ne soit plus sous l'emprise de la dernière cage dudit laminoir.each of said rolling mill stands is given the respective additional skew instruction (Sp), and said operations are repeated at predetermined time intervals, until said strip (B) is no longer under the influence of the last cage of said rolling mill.
2. Procédé selon la revendication 1 , selon lequel que ladite position de référence (6) est choisie de telle sorte que le coin de ladite bande (B) soit nul. 2. Method according to claim 1, wherein said reference position (6) is chosen such that the corner of said strip (B) is zero.
3. Procédé selon la revendication 1 ou 2, selon lequel ladite matrice de gain K est constante jusqu'à ce que ladite bande (B) ne soit plus sous l'emprise que de la première cage dudit laminoir.3. The method of claim 1 or 2, wherein said gain matrix K is constant until said strip (B) is no longer under the grip of the first cage of said mill.
4. Procédé selon l'une quelconque des revendications 1 à 3, selon lequel au moins deux desdites valeurs représentatives de la position latérale de la bande (B) sont des valeurs fournies par des capteurs placés en aval des cages de laminoir correspondantes.4. A method according to any one of claims 1 to 3, wherein at least two of said values representative of the lateral position of the strip (B) are values provided by sensors placed downstream of the corresponding rolling mill stands.
5. Procédé selon la revendication 4, selon lequel au moins une desdites valeurs représentatives de la position latérale de la bande (B) est une valeur calculée à partir des valeurs fournies par lesdits capteurs placés en aval des autres cages de laminoir, les autres valeurs représentatives étant les valeurs fournies par lesdits capteurs.The method according to claim 4, wherein at least one of said values representative of the lateral position of the strip (B) is a value calculated from the values provided by said sensors placed downstream of the other rolling mill stands, the other values representative being the values provided by said sensors.
6. Procédé selon la revendication 5, selon lequel ladite valeur calculée de position latérale de la bande (B) est obtenue en utilisant les paramètres de ladite matrice de gain K.The method of claim 5, wherein said calculated lateral position value of the band (B) is obtained using the parameters of said gain matrix K.
7. Procédé selon la revendication 4, selon lequel toutes les valeurs représentatives de la position latérale de la bande (B) sont des valeurs mesurées par lesdits capteurs, au nombre de un en aval de chaque cage dudit laminoir.7. The method of claim 4, wherein all the values representative of the lateral position of the strip (B) are values measured by said sensors, the number of one downstream of each cage of said rolling mill.
8. Procédé selon l'une quelconque des revendications 4 à 7, selon lequel lesdites valeurs fournies par lesdits capteurs sont obtenues par filtrage du signal brut d'acquisition, ledit filtrage prenant en compte les valeurs calculées d'écarts (Δxp) entre lesdites positions latérales de la bande (B) et la position de référence (6).8. Method according to any one of claims 4 to 7, wherein said values provided by said sensors are obtained by filtering the raw acquisition signal, said filtering taking into account the calculated values of deviations (Δxp) between said positions. side of the band (B) and the reference position (6).
9. Procédé selon l'une quelconque des revendications 1 à 8, selon lequel, lorsqu'un déhanchement additionnel (Sp) à imposer est inférieur à un seuil prédéterminé, aucune consigne de déhanchement additionnel n'est transmise à la cage concernée. 9. Method according to any one of claims 1 to 8, wherein, when an additional skew (Sp) to be imposed is less than a predetermined threshold, no additional skew instruction is transmitted to the cage concerned.
10. Procédé de laminage d'une bande (B) selon l'une quelconque des revendications 1 à 10, selon lequel, lorsque ladite bande (B) n'est plus sous l'emprise de la première cage dudit laminoir, on régule à la fois la position latérale de la partie de la bande (B) encore sous l'emprise d'au moins deux cages du laminoir et l'angle de pivotement par rapport à l'axe de laminage de la queue de la bande (B), en calculant et en transmettant une valeur de déhanchement additionnel à chaque cage sous laquelle la bande (B) est encore présente.10. A method of rolling a strip (B) according to any one of claims 1 to 10, wherein, when said strip (B) is no longer under the influence of the first cage of said rolling mill, is regulated to both the lateral position of the portion of the strip (B) still under the influence of at least two roll stands and the pivot angle with respect to the rolling axis of the tail of the strip (B) , calculating and transmitting an additional skew value to each cage under which the band (B) is still present.
11. Procédé selon la revendication 10, selon lequel, pour chaque cage, on détermine la valeur de déhanchement additionnel à appliquer en utilisant une valeur représentative dudit angle de pivotement de la queue de bande (B) à l'entrée de la cage.11. The method of claim 10, wherein for each cage, the additional skew value to be applied is determined using a value representative of said pivot angle of the tail (B) at the entrance of the cage.
12. Procédé selon la revendication 11 , selon lequel on calcule ladite valeur représentative dudit angle de pivotement au moyen de valeurs représentatives de la position latérale de la bande (B) selon une ligne transversale à sa direction de déplacement, dans lesdites cages en emprise avec la bande (B), lesdites valeurs représentatives étant obtenues conformément aux revendications 6 à 10.12. The method of claim 11, wherein said value representative of said pivot angle is calculated by means of values representative of the lateral position of the strip (B) in a line transverse to its direction of movement, in said cages in line with the band (B), said representative values being obtained according to claims 6 to 10.
13. Dispositif de régulation de la position latérale d'une bande (B) à l'intérieur d'un laminoir de produits métalliques comportant au moins deux cages (1 ,2) dans lesquelles ladite bande (B) est simultanément sous emprise et comprenant:13. Device for regulating the lateral position of a strip (B) inside a rolling mill of metal products comprising at least two cages (1, 2) in which said strip (B) is simultaneously under the influence and comprising :
- au moins deux capteurs (4,5) fournissant un signal brut d'acquisition permettant la détermination de valeurs représentatives de la position latérale de la bande (B) selon une ligne transversale à sa direction de déplacement en aval d'au moins deux cages (1 ,2) dudit laminoir,- At least two sensors (4,5) providing a raw acquisition signal for determining values representative of the lateral position of the strip (B) along a line transverse to its direction of travel downstream of at least two cages. (1, 2) of said rolling mill,
- des moyens (7) pour déterminer les écarts algébriques (Δxp) entre lesdites valeurs représentatives et une position de référence (6), - des moyens (8) de calcul de la valeur (Sp) du déhanchement additionnel à imposer à chacune desdites cages du laminoir, à partir desdits écarts (Δxp), afin de ramener lesdits écarts algébriques (Δxp) en dessous d'un seuil prédéterminé, - des moyens (9) de calcul d'une matrice de gain K qui permet d'obtenir lesdites valeurs (Sp) de déhanchements additionnels par multiplication de ladite matrice K avec lesdites valeurs d'écarts (Δxp) "etmeans (7) for determining the algebraic deviations (Δxp) between said representative values and a reference position (6), means (8) for calculating the value (Sp) of the additional skewness to be imposed on each of said rolling mill stands, from said gaps (Δxp), in order to reduce said algebraic deviations (Δxp) below a predetermined threshold means (9) for calculating a gain matrix K which makes it possible to obtain said additional drift values (Sp) by multiplication of said matrix K with said deviation values (Δxp) "and
- des moyens (10) pour transmettre la consigne de déhanchement additionnel (Sp) respective à chacune desdites cages de laminoir, à intervalles de temps prédéterminés.means (10) for transmitting the respective additional deskew instruction (Sp) to each of said rolling mill stands, at predetermined time intervals.
14. Dispositif selon la revendication 13, comprenant en outre des moyens de filtrage du signal brut d'acquisition desdits capteurs.14. Device according to claim 13, further comprising means for filtering the raw acquisition signal of said sensors.
15. Dispositif de régulation de la position de la queue d'une bande (B) à l'intérieur d'un laminoir de produits métalliques comportant au moins deux cages (1 ,2), comprenant :15. Device for regulating the position of the tail of a strip (B) inside a rolling mill of metal products comprising at least two cages (1, 2), comprising:
- des moyens de calcul de l'angle de pivotement de ladite queue de bande (B) avec l'axe de laminage,means for calculating the pivot angle of said web tail (B) with the rolling axis,
- des moyens de calcul de la valeur du déhanchement additionnel à imposer à chacune desdites cages (1 ,2) du laminoir, afin de ramener la valeur dudit angle de pivotement en dessous d'un seuil prédéterminé, et - des moyens pour transmettre la consigne de déhanchement additionnel (Sp) respective à chacune desdites cages (1,2) de laminoir, à intervalles de temps prédéterminés.means for calculating the value of the additional swaying to be imposed on each of said stands (1, 2) of the rolling mill, in order to reduce the value of said pivot angle below a predetermined threshold, and means for transmitting the instruction additional skew (Sp) respective to each of said mill stands (1,2), at predetermined time intervals.
16. Dispositif de régulation selon la revendication 15 comprenant en outre des moyens de transmission des écarts algébriques (Δxp) entre les valeurs représentatives de la position latérale de la bande (B) selon une ligne transversale à sa direction de déplacement en aval d'au moins deux cages (1 ,2) dudit laminoir, et une position de référence (6), vers lesdits moyens de calcul de l'angle de pivotement de ladite queue de bande (B) avec l'axe de laminage.16. Control device according to claim 15 further comprising means for transmitting the algebraic deviations (Δxp) between the values representative of the lateral position of the strip (B) along a line transverse to its direction of travel downstream of the at least two stands (1, 2) of said rolling mill, and a reference position (6), towards said means calculating the pivot angle of said web tail (B) with the rolling axis.
17. Laminoir de produits métalliques sous forme de bandes, du type comportant au moins deux cages (1,2) et au moins un dispositif de régulation de la position latérale de la bande (B) du type selon l'une ou l'autre des revendications 13 ou 14.17. Rolling machine of metal products in the form of strips, of the type comprising at least two cages (1,2) and at least one device for regulating the lateral position of the strip (B) of the type according to one or the other Claims 13 or 14.
18. Laminoir selon la revendication 17 comportant en outre au moins un dispositif de régulation de la position de la queue de ladite bande (B) selon l'une ou l'autre des revendications 15 ou 16.18. Rolling mill according to claim 17 further comprising at least one device for regulating the position of the tail of said strip (B) according to either of claims 15 or 16.
19. Laminoir selon l'une ou l'autre des revendications 17 ou 18, caractérisé en ce qu'il s'agit d'un laminoir finisseur pour le laminage à chaud de bandes d'acier.19. Rolling mill according to any one of claims 17 or 18, characterized in that it is a finishing mill for the hot rolling of steel strips.
20. Laminoir selon la revendication 19, comprenant deux, cinq, six ou sept cages de laminage.20. Rolling mill according to claim 19, comprising two, five, six or seven rolling stands.
21. Laminoir selon l'une ou l'autre des revendications 17 ou 18, caractérisé en ce qu'il s'agit d'un laminoir pour le laminage à froid ou le skin-pass de bandes d'acier.21. Rolling mill according to any one of claims 17 or 18, characterized in that it is a rolling mill for cold rolling or skin-pass steel strips.
22. Laminoir selon la revendication 21 , comprenant deux, trois, quatre ou cinq cages de laminage. 22. Rolling mill according to claim 21, comprising two, three, four or five rolling stands.
EP08805610.6A 2007-06-11 2008-05-27 Method for rolling a metal strip with adjustment of the side position of the strip and adapted rolling mill Active EP2167248B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP07290719A EP2014380A1 (en) 2007-06-11 2007-06-11 Method of rolling a band of metal with adjustment of its lateral position on the one hand and adapted rolling mill
PCT/FR2008/000719 WO2009004155A1 (en) 2007-06-11 2008-05-27 Method for rolling a metal strip with adjustment of the side position of the strip and adapted rolling mill

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EP2167248A1 true EP2167248A1 (en) 2010-03-31
EP2167248B1 EP2167248B1 (en) 2013-07-10

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BRPI0812943B1 (en) 2020-09-15
RU2009149180A (en) 2011-07-20
EP2014380A1 (en) 2009-01-14
KR101511804B1 (en) 2015-04-13
EP2167248B1 (en) 2013-07-10
JP5638945B2 (en) 2014-12-10
US20100269556A1 (en) 2010-10-28
ZA200908778B (en) 2010-08-25
RU2449846C2 (en) 2012-05-10
CN102202806A (en) 2011-09-28
CA2690096C (en) 2012-08-28
AU2008270190A1 (en) 2009-01-08
KR20100022040A (en) 2010-02-26
BRPI0812943A2 (en) 2014-12-16
WO2009004155A8 (en) 2011-06-16
US8919162B2 (en) 2014-12-30
CA2690096A1 (en) 2009-01-08
WO2009004155A1 (en) 2009-01-08
CN102202806B (en) 2016-11-09
JP2010528874A (en) 2010-08-26

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