EP2172282B1 - Process for controlling rolling of a sheet metal strip - Google Patents

Process for controlling rolling of a sheet metal strip Download PDF

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Publication number
EP2172282B1
EP2172282B1 EP20090305933 EP09305933A EP2172282B1 EP 2172282 B1 EP2172282 B1 EP 2172282B1 EP 20090305933 EP20090305933 EP 20090305933 EP 09305933 A EP09305933 A EP 09305933A EP 2172282 B1 EP2172282 B1 EP 2172282B1
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EP
European Patent Office
Prior art keywords
cage
strip
thickness
speed
cylinders
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Application number
EP20090305933
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German (de)
French (fr)
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EP2172282A1 (en
Inventor
Samir El Akoum
Lionel Broussard
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GE Energy Power Conversion Technology Ltd
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Converteam Technology Ltd
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Publication of EP2172282A1 publication Critical patent/EP2172282A1/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
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B21B37/165—Control of thickness, width, diameter or other transverse dimensions responsive mainly to the measured thickness of the product
    • 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
    • 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
    • B21B1/30—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 non-continuous process
    • B21B1/32—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 non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
    • B21B1/36—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 non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work by cold-rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2271/00—Mill stand parameters
    • B21B2271/02—Roll gap, screw-down position, draft position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/02—Speed
    • B21B2275/04—Roll speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/02—Speed
    • B21B2275/06—Product speed
    • 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
    • B21B37/46—Roll speed or drive motor control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/58—Roll-force control; Roll-gap control
    • 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
    • B21B38/04—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product

Definitions

  • Cold rolling is an important step in the development of long products in the metallurgical industry. Its purpose is to reduce the thickness of the input product.
  • the sheets produced are usually intended for the automotive and food industries.
  • a method according to the preamble of claim 1 is for example known from the document JP-A 600 96 320 .
  • Rolling therefore consists of reducing the thickness of a metal strip by plastic deformation.
  • the strip flows continuously between two rotary cylinders, called working cylinders, with parallel axes delimiting between them a nip space commonly called air gap, and on which a force is applied.
  • the thickness reduction of the band is then obtained by crushing.
  • This device constitutes a cage of a rolling mill.
  • the use of several successive cages in which the band passes simultaneously is a tandem mill. Alternatively a single cage can be used, the band flowing alternately in two opposite directions in said cage.
  • the working rolls are rotated at a controlled speed.
  • the thickness variations at the outlet of the rolling mill must be as small as possible. For this, different control loops are implemented.
  • the gap is the distance separating the two working cylinders, that is to say the spacing between these two cylinders.
  • One of these regulations is based on the thickness measurement of the strip made at the exit of the cage.
  • the two regulations are applied distinctly from each other.
  • all thickness variations are seen by the two regulators, which induces parasitic corrections and therefore disturbances on the thickness of the strip.
  • the presence of a gap between the two measurements the measurement of the thickness of the strip downstream of the cage being "further” than the prediction of the thickness of the strip at the outlet of the cage, can to bring about contradictory corrections of the two regulators.
  • the major disadvantage of the first regulation based on the measurement of the thickness at the exit of the cage is the delay in its reaction vis-à-vis the thickness disturbances, this is due to the fact that there is a temporary shift between what is really happening under the cage and what the measure sees. This offset is due to the transfer of the band of the cage to the point of measurement of the thickness of the strip downstream of the cage.
  • the second regulation does without this problem of delay by predicting with the aid of the law of the flows the thickness directly under the cage.
  • the major disadvantages of such a regulation are the corrections parasites due to calculation errors (typically an offset) based on several noisy measurements.
  • One of the aims of the invention is to overcome these disadvantages by proposing a rolling control method to improve the rejection of thickness disturbances and further reduce the thickness variations of the strip at the output of the rolling mill.
  • the invention relates to a rolling control method of the aforementioned type, in which the method comprises a step for correcting the spacing of the rolls or their rotational speed as a function of both the thickness measured in downstream of the cage and the estimation of the thickness of the strip according to the law of flow rates.
  • the method according to the invention uses only one regulator simultaneously operating the measurement of the thickness of the strip downstream of the cage and the prediction of the thickness of the strip at the outlet of the cage by the law. flow rates. In this way spurious corrections and contradictory corrections are avoided, which makes it possible to improve the rejection of thickness disturbances by taking better account of disturbances in the cage. This improves the performance of the rolling mill more generally.
  • upstream is defined relative to the running direction of the sheet metal strip in the rolling mill. This direction is represented by the arrow F of the Fig. 1 .
  • FIG. 1 is schematically illustrated a cold rolling installation 1 of a strip B of metal sheet.
  • this installation comprises, as known per se, a system 2 for maintaining traction at the input of the rolling mill.
  • This system comprises a unwinder 4 in the case of a roll-to-roll mill or an S-block in the case of a continuous rolling mill, whose unwinding speed is controlled by a torque control unit 6.
  • the rolling plant on which this invention can be applied comprises at least one cage 8, but may comprise two or more.
  • the invention applies both to rolling mills of the "reversible" type, in which the band B circulates in the cage 8 alternately in two opposite direction of travel, than to the rolling mills in which the band B circulates in a single direction of travel. .
  • the rolling mill stand 8 comprises two working rolls 10 with parallel axes between which the band B circulates. These rolls are rotated by drive motors whose speed is regulated according to a predetermined set point. u.
  • the cage 8 comprises a hydraulic or electromechanical clamping device 12 making it possible to transmit to both the working rolls 10 the rolling force necessary so that they ensure the predetermined thickness reduction.
  • This device 12 provides an adjustment of the gap separating the two cylinders 10, that is to say the spacing of the cylinders 10.
  • the rolling force is transmitted from the device 12 to the working cylinders 10 through a stacking one or more support cylinders 14, except the duo cages, where the force is transmitted directly from the device 12 to the working cylinders 10.
  • a gauge 16 of thickness J e is disposed upstream of the cage 8. This gauge 16 is able to continuously determine the thickness of the band B before entering the cage 8.
  • a second gauge 18 of thickness J s is disposed downstream of the cage 8. It is capable of continuously determining the thickness of the strip B after its rolling in the cage 8.
  • a speed sensor V e is disposed at the input of the cage 8. It is capable of continuously determining the instantaneous linear speed of circulation of the strip B at the input of the cage 8.
  • the sensor is formed, for example, of a laser velocimeter.
  • a speed sensor V S is disposed at the output of the cage 8. It is capable of continuously determining the instantaneous linear speed of circulation of the strip B at the outlet of the cage 8.
  • the sensor is formed, for example, of a laser velocimeter.
  • An outlet thickness regulator 24 is provided to exploit the measurements made by the thickness gauges 16 and 18 and by the speed sensors 20 and 22. This regulator 24 uses the distance between the rolls 10 to regulate this thickness. .
  • the measurement of the gauge 18 of thickness J s is used in the regulation of the thickness of the strip in order to correct the spacing of the rolls 10.
  • the regulator 24 receives an instruction of thickness of exit of the cage Jcs corresponding to the desired thickness at the exit of cage.
  • the measured thickness J S is subtracted from this setpoint thickness J CS in order to know the difference in thickness between the measured thickness and the desired thickness, which makes it possible to calculate a correction to be made in the spacing of the rolls 10 to obtain the desired thickness at the exit of the cage 8.
  • the measurement of the thickness J s downstream of the cage is combined, as shown in FIG. Fig. 2 , with the prediction of the thickness at the outlet of the cage according to the law of flow rates.
  • the controller 24 receives the measurements taken by the sensor 20 of speed V e at the input of the cage 8, the gauge 16 of thickness e J input of the cage 8 and the sensor 22 of speed V s at the exit of the cage.
  • the measurement of the thickness J e at the entrance of the cage 8 is supplied to the multiplier 26 via a delay line 28 in order to take account of the temporary offset corresponding to the transfer time of the band B between the measuring the thickness J e of the strip B upstream of the cage 8 and the cage 8, that is to say to take into account the distance between the place where the measurement J e is made and the cage 8 .
  • the estimate of the thickness E s at the output of the cage 8 is obtained according to the law of flow rates.
  • This estimate E s is compared to the thickness setpoint J CS at the exit of the cage. For this purpose, the estimate E s is subtracted from the thickness setpoint J CS to constitute a prediction of the thickness error at the exit of the cage 8.
  • This prediction of the thickness errors at the exit of the cage 8 passes through a delay line 30 in order to take account of the temporary offset corresponding to the transfer time of the band B of the cage 8 to the measurement point of the thickness J s of the strip downstream of the cage 8 and a model 32 of the thickness gauge 18 output of the cage 8.
  • the value obtained is subtracted from the prediction of the thickness errors at the output of the cage 8 and constitutes the thickness error at the outlet of the cage 8 to be taken into account by the regulator 24 during the transport time of the strip from the exit of the cage 8 to the output thickness gauge 18.
  • the thickness errors obtained by measuring the thickness J s at the exit of cage 8 and by the estimation of the thickness according to the law of the flow rates are added, which makes it possible to calculate the correction Ce to be carried out on the spacing of the rolls 10 to obtain the desired band thickness B at the outlet of the cage 8 by means of the regulator 24.
  • the correction Ce takes account of both the thickness measured downstream of the cage and the estimation of the thickness of the strip according to the law of flow rates.
  • the simultaneous taking into account of these two regulations makes it possible to avoid the parasitic and contradictory corrections encountered when the two regulations are used in parallel. Thus, disturbances are reduced on the thickness of the strip B at the outlet of the cage 8 and the performance of the rolling mill is improved.
  • the correction of the spacing of the rolls 10 for the band B at the moment of its passage in the cage depends only on the estimation of the thickness of this band according to the law of flow rates. And when the real value of the thickness of said strip B is known via measurement of the thickness gauge J s output downstream of the cage 8, the prediction of the thickness by the law of the flow rates is more necessary and is therefore no longer taken into account using devices 30 and 32.
  • the correction It is applied to the spacing of the rolls 10 by means of the clamping device 12, as shown in FIG. Fig. 1 .
  • This action modifies the thickness of the band B at the exit of cage 8.
  • the correction Ce is also used by an inertial compensation unit 34, connected to the torque control unit 6.
  • the filter 34 is able to determine from the correction Ce and the mechanical characteristics of the band B, the correction of torque C c which must be imposed on the system 2 for maintaining traction at the input of the rolling mill.
  • the correction Ce is supplied to a filter 34 making it possible to perform the inertia compensation, as shown in FIG. Fig. 2 .
  • the correction of the spacing of the rolls 10 may to be done for both directions.
  • the role of the thickness gauges 16 and 18 and the speed sensors 20 and 22 is reversed. That is to say, the thickness gauge 18 serves to measure thickness upstream of the cage, while the thickness gauge 16 serves to measure the thickness downstream, and the speed sensor 22 is used to measure the speed at the entrance of the cage while the speed sensor 20 is used to measure the output speed.
  • the correction can be applied to the speed of rotation of the rolls instead of the spacing of the rolls 10 in a known manner.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)

Description

La présente invention concerne un procédé de contrôle du laminage d'une bande de tôle, du type comportant le passage de la bande en continu selon au moins une direction de défilement dans au moins une cage comportant au moins deux cylindres entraînés entre lesquels la bande circule et subit un écrasement, comprenant les étapes suivantes :

  • la mesure de l'épaisseur de la bande en aval de la cage par rapport à la direction de défilement,
  • l'estimation de l'épaisseur de la bande en sortie de la cage selon la loi des débits.
The present invention relates to a method for controlling the rolling of a sheet metal strip, of the type comprising the passage of the strip continuously in at least one direction of travel in at least one cage comprising at least two driven rolls between which the strip is circulated and is crushed, including the steps of:
  • measuring the thickness of the strip downstream of the cage relative to the direction of travel,
  • estimating the thickness of the strip at the outlet of the cage according to the law of flow rates.

Le laminage à froid est une étape importante dans l'élaboration des produits longs dans l'industrie métallurgique. Son objectif est de réduire l'épaisseur du produit d'entrée. Les tôles produites sont usuellement destinées aux industries automobiles et alimentaires. Un procédé selon le préambule de la revendication 1 est par example connu du document JP-A 600 96 320 .Cold rolling is an important step in the development of long products in the metallurgical industry. Its purpose is to reduce the thickness of the input product. The sheets produced are usually intended for the automotive and food industries. A method according to the preamble of claim 1 is for example known from the document JP-A 600 96 320 .

Le laminage consiste donc à réduire l'épaisseur d'une bande de métal par déformation plastique. Pour cela, la bande circule en continu entre deux cylindres rotatifs, appelés cylindres de travail, à axes parallèles délimitant entre eux un espace de pincement couramment appelé entrefer, et sur lesquelles un effort est appliqué. La réduction d'épaisseur de la bande est alors obtenue par écrasement. Ce dispositif constitue une cage d'un laminoir. L'utilisation de plusieurs cages successives dans lesquelles la bande passe simultanément constitue un tandem de laminoir. En alternative une seule cage peut être utilisée, la bande circulant alternativement selon deux directions opposées dans ladite cage.Rolling therefore consists of reducing the thickness of a metal strip by plastic deformation. For this, the strip flows continuously between two rotary cylinders, called working cylinders, with parallel axes delimiting between them a nip space commonly called air gap, and on which a force is applied. The thickness reduction of the band is then obtained by crushing. This device constitutes a cage of a rolling mill. The use of several successive cages in which the band passes simultaneously is a tandem mill. Alternatively a single cage can be used, the band flowing alternately in two opposite directions in said cage.

Les cylindres de travail sont entraînés en rotation à une vitesse régulée. Pour des raisons métallurgiques, les variations d'épaisseur en sortie du laminoir doivent être les plus faibles possibles. Pour cela, différentes boucles de régulation sont mises en oeuvre.The working rolls are rotated at a controlled speed. For metallurgical reasons, the thickness variations at the outlet of the rolling mill must be as small as possible. For this, different control loops are implemented.

Ainsi, il est courant de mesurer en continu la vitesse linéaire de la bande en entrée et en sortie de la cage, et l'épaisseur de la bande en entrée et en sortie de la cage.Thus, it is common to measure continuously the linear speed of the band at the entrance and exit of the cage, and the thickness of the band at the entrance and exit of the cage.

A partir de ces mesures, il est connu d'utiliser deux régulations en parallèle qui consistent à corriger l'entrefer des cylindres de travail. L'entrefer est la distance séparant les deux cylindres de travail, c'est-à-dire l'écartement entre ces deux cylindres.From these measurements, it is known to use two parallel regulations which consist in correcting the air gap of the working rolls. The gap is the distance separating the two working cylinders, that is to say the spacing between these two cylinders.

L'une de ces régulations se base sur la mesure d'épaisseur de la bande effectuée en sortie de la cage.One of these regulations is based on the thickness measurement of the strip made at the exit of the cage.

L'autre régulation consiste en une prédiction de l'épaisseur de la bande en sortie de la cage en utilisant la loi dite des débits. En considérant que la largeur de la bande reste constante, on obtient l'épaisseur de la bande en sortie de la cage par la relation : Es = Ee.Ve/Vs où Es est l'épaisseur de la bande en sortie de la cage, Ee est l'épaisseur de la bande mesurée en entrée de la cage, Ve est la vitesse de défilement de la bande en entrée de la cage et Vs est la vitesse de défilement de la bande en sortie de la cage.The other regulation consists of a prediction of the thickness of the strip at the exit of the cage by using the so-called flow law. Considering that the width of the band remains constant, the thickness of the strip at the exit of the cage is obtained by the relation: E s = E e .V e / V s where E s is the thickness of the strip in output of the cage, E e is the thickness of the band measured at the entrance to the cage, V e is the running speed of the band at the entrance of the cage and V s is the speed of the band at the exit of the cage; the cage.

Ces régulations d'épaisseur peuvent également être appliquées sur la dernière cage d'un tandem pour modifier la vitesse de rotation des cylindres au lieu de leur écartement.These thickness regulations can also be applied to the last cage of a tandem to change the speed of rotation of the rolls instead of their spacing.

Ces procédés de correction permettent de réduire les variations d'épaisseur de la bande, mais restent insuffisants pour tenir compte des phénomènes complexes qui se produisent dans un laminoir.These correction methods make it possible to reduce the variations in thickness of the strip, but remain insufficient to take account of the complex phenomena that occur in a rolling mill.

En effet, les deux régulations sont appliquées distinctement l'une de l'autre. Ainsi, toutes les variations d'épaisseur sont vues par les deux régulateurs, ce qui induit des corrections parasites et donc des perturbations sur l'épaisseur de la bande. En outre, la présence d'un décalage entre les deux mesures, la mesure de l'épaisseur de la bande en aval de la cage étant plus « éloignée » que la prédiction de l'épaisseur de la bande en sortie de la cage, peut amener à des corrections contradictoires des deux régulateurs.Indeed, the two regulations are applied distinctly from each other. Thus, all thickness variations are seen by the two regulators, which induces parasitic corrections and therefore disturbances on the thickness of the strip. In addition, the presence of a gap between the two measurements, the measurement of the thickness of the strip downstream of the cage being "further" than the prediction of the thickness of the strip at the outlet of the cage, can to bring about contradictory corrections of the two regulators.

L'inconvénient majeur de la première régulation se basant sur la mesure de l'épaisseur en sortie de la cage est le retard dans sa réaction vis-à-vis des perturbations d'épaisseur, cela est dû au fait qu'il y a un décalage temporaire entre ce qui se passe vraiment sous la cage et ce que voit la mesure. Ce décalage est dû au transfert de la bande de la cage au point de mesure de l'épaisseur de la bande en aval de la cage. La deuxième régulation se passe de ce problème de retard en prédisant à l'aide de la loi des débits l'épaisseur directement sous la cage. Les inconvénients majeur d'une telle régulation sont les corrections parasites dues aux erreurs de calcul (typiquement un offset) se basant sur plusieurs mesures bruitées.The major disadvantage of the first regulation based on the measurement of the thickness at the exit of the cage is the delay in its reaction vis-à-vis the thickness disturbances, this is due to the fact that there is a temporary shift between what is really happening under the cage and what the measure sees. This offset is due to the transfer of the band of the cage to the point of measurement of the thickness of the strip downstream of the cage. The second regulation does without this problem of delay by predicting with the aid of the law of the flows the thickness directly under the cage. The major disadvantages of such a regulation are the corrections parasites due to calculation errors (typically an offset) based on several noisy measurements.

L'un des buts de l'invention est de pallier ces inconvénients en proposant un procédé de contrôle du laminage permettant d'améliorer le rejet des perturbations d'épaisseur et de réduire encore les variations d'épaisseur de la bande en sortie du laminoir.One of the aims of the invention is to overcome these disadvantages by proposing a rolling control method to improve the rejection of thickness disturbances and further reduce the thickness variations of the strip at the output of the rolling mill.

A cet effet, l'invention concerne un procédé de contrôle du laminage du type précité, dans lequel le procédé comprend une étape de correction de l'écartement des cylindres ou de leur vitesse de rotation en fonction à la fois de l'épaisseur mesurée en aval de la cage et de l'estimation de l'épaisseur de la bande selon la loi des débits.For this purpose, the invention relates to a rolling control method of the aforementioned type, in which the method comprises a step for correcting the spacing of the rolls or their rotational speed as a function of both the thickness measured in downstream of the cage and the estimation of the thickness of the strip according to the law of flow rates.

Ainsi, le procédé selon l'invention n'utilise qu'un seul régulateur exploitant simultanément la mesure de l'épaisseur de la bande en aval de la cage et la prédiction de l'épaisseur de la bande en sortie de la cage par la loi des débits. On évite ainsi les corrections parasites et les corrections contradictoires, ce qui permet d'améliorer le rejet des perturbations d'épaisseur en tenant mieux compte des perturbations dans la cage. On améliore ainsi de façon plus générale les performances du laminoir.Thus, the method according to the invention uses only one regulator simultaneously operating the measurement of the thickness of the strip downstream of the cage and the prediction of the thickness of the strip at the outlet of the cage by the law. flow rates. In this way spurious corrections and contradictory corrections are avoided, which makes it possible to improve the rejection of thickness disturbances by taking better account of disturbances in the cage. This improves the performance of the rolling mill more generally.

Selon d'autres caractéristiques du procédé de contrôle du laminage selon l'invention :

  • l'étape de correction de l'écartement des cylindres ou de leur vitesse de rotation en fonction à la fois de l'épaisseur mesurée en aval de la cage et de l'estimation de l'épaisseur de la bande selon la loi des débits est réalisée au moyen d'un seul régulateur ;
  • l'estimation Es de l'épaisseur de la bande en sortie de la cage selon la loi des débits comprend la mesure de l'épaisseur Je et de la vitesse de défilement Ve de la bande en amont de la cage et la mesure de la vitesse de défilement Vs de la bande en aval de la cage, l'estimation de l'épaisseur Es de la bande en sortie de la cage étant donnée par la relation Es = Je.Ve/Vs ;
  • l'estimation de l'épaisseur de la bande dans la cage selon la loi des débits tient compte d'un décalage temporaire correspondant au temps de transfert de la bande entre le point de mesure de l'épaisseur de la bande en amont de la cage et la cage ;
  • pour une zone donnée de la bande, la correction de l'écartement des cylindres ou de leur vitesse de rotation en fonction à la fois de l'épaisseur mesurée en aval de la cage et de l'estimation de l'épaisseur de la bande selon la loi des débits est réalisée immédiatement lors du passage de ladite zone sous la cage ;
  • l'estimation de l'épaisseur de la bande selon la loi des débits est intégrée à la correction de l'écartement des cylindres ou de leur vitesse de rotation en tenant compte d'un décalage temporaire correspondant au temps de transfert de la bande de la cage au point de mesure de l'épaisseur de la bande en aval de la cage ;
  • le procédé de contrôle comporte la commande d'un dispositif de maintien de la traction situé en amont de la cage et ce que ladite commande tient compte de la correction de l'écartement des cylindres ou de leur vitesse de rotation ;
  • la bande circule dans la cage alternativement selon deux directions de défilement opposées l'une par rapport à l'autre, la correction de l'écartement des cylindres ou de leur vitesse de rotation en fonction de l'épaisseur mesurée en aval de la cage et de l'estimation de l'épaisseur de la bande selon la loi des débits étant réalisée pour chacune desdites directions ; et
  • la bande circulant dans au moins deux cages successives, le procédé comprend une étape de correction de l'écartement des cylindres pour la première cage par rapport à la direction de défilement de la bande et une étape de correction de la vitesse de rotation des cylindres pour la dernière cage par rapport à la direction de défilement de la bande, lesdites étapes de correction étant réalisées en fonction à la fois de l'épaisseur mesurée en aval de la cage et de l'estimation de l'épaisseur de la bande selon la loi des débits.
According to other characteristics of the rolling control method according to the invention:
  • the step of correcting the spacing of the rolls or their speed of rotation as a function of both the thickness measured downstream of the cage and the estimation of the thickness of the strip according to the law of flow rates is realized by means of a single regulator;
  • the estimate E s of the thickness of the strip at the outlet of the cage according to the law of flow rates comprises the measurement of the thickness J e and the running speed V e of the strip upstream of the cage and the measurement the speed of travel V s of the strip downstream of the cage, the estimate of the thickness E s of the strip at the exit of the cage being given by the relation E s = J e .V e / V s ;
  • the estimation of the thickness of the strip in the cage according to the law of the flows takes into account a temporary offset corresponding to the time of transfer of the strip between the point of measurement of the thickness of the strip upstream of the cage and the cage;
  • for a given zone of the strip, the correction of the spacing of the rolls or their speed of rotation as a function of both the thickness measured downstream of the cage and the estimate of the thickness of the strip according to the law of the flows is carried out immediately during the passage of said zone under the cage;
  • the estimation of the thickness of the strip according to the law of the flow rates is integrated in the correction of the spacing of the rolls or their speed of rotation by taking into account a temporary offset corresponding to the transfer time of the strip of the cage at the point of measurement of the thickness of the strip downstream of the cage;
  • the control method comprises the control of a traction holding device located upstream of the cage and that said control takes into account the correction of the spacing of the rolls or their speed of rotation;
  • the strip circulates in the cage alternately in two opposite directions of travel relative to one another, the correction of the spacing of the rolls or their speed of rotation as a function of the thickness measured downstream of the cage and the estimation of the thickness of the strip according to the law of the flow rates being carried out for each of said directions; and
  • the band circulating in at least two successive cages, the method comprises a step of correction of the spacing of the rolls for the first cage with respect to the running direction of the strip and a step of correction of the speed of rotation of the rolls for the last cage relative to the running direction of the strip, said correction steps being performed as a function of both the thickness measured downstream of the cage and the estimation of the thickness of the strip according to the law flow rates.

L'invention concerne également un dispositif de contrôle du laminage d'une bande de tôle du type comprenant au moins une cage comportant au moins deux cylindres entraînés entre lesquels la bande circule et subit un écrasement, comprenant :

  • des moyens de mesure de l'épaisseur de la bande en aval de la cage ;
  • des moyens de mesure de l'épaisseur de la bande et de la vitesse de défilement de la bande en amont de la cage,
  • des moyens de mesure de la vitesse de défilement de la bande en aval de la cage,
  • des moyens de correction de l'écartement des cylindres ou de leur vitesse de rotation,
le dispositif comprenant des moyens pour la mise en oeuvre d'un procédé tel que décrit ci-dessus.The invention also relates to a device for controlling the rolling of a sheet metal strip of the type comprising at least one cage comprising at least two driven cylinders between which the band circulates and undergoes crushing, comprising:
  • means for measuring the thickness of the strip downstream of the cage;
  • means for measuring the thickness of the strip and the speed of travel of the strip upstream of the cage,
  • means for measuring the speed of travel of the strip downstream of the cage,
  • means for correcting the spacing of the rolls or their speed of rotation,
the device comprising means for implementing a method as described above.

D'autres aspects et avantages de l'invention apparaîtront à la lecture de la description qui suit, donnée à titre d'exemple et faite en référence aux dessins annexés, dans lesquels :

  • la Fig. 1 est une représentation schématique d'une installation de laminage selon l'invention,
  • la Fig. 2 est un schéma des moyens mis en oeuvre pour effectuer la régulation de l'épaisseur de la bande en fonction de l'épaisseur de la bande mesurée en aval de la cage et de l'estimation de l'épaisseur de la bande en sortie de la cage selon la loi des débits.
Other aspects and advantages of the invention will appear on reading the description which follows, given by way of example and with reference to the appended drawings, in which:
  • the Fig. 1 is a schematic representation of a rolling plant according to the invention,
  • the Fig. 2 is a diagram of the means used to effect the regulation of the thickness of the strip as a function of the thickness of the strip measured downstream of the cage and the estimate of the thickness of the strip at the outlet of the strip. cage according to the law of flow.

Dans la description, les termes « amont », « aval », « entrée » et « sortie » sont définis par rapport à la direction de défilement de la bande de tôle dans le laminoir. Cette direction est représentée par la flèche F de la Fig. 1.In the description, the terms "upstream", "downstream", "input" and "output" are defined relative to the running direction of the sheet metal strip in the rolling mill. This direction is represented by the arrow F of the Fig. 1 .

Sur la Fig. 1 est illustrée schématiquement une installation 1 de laminage à froid d'une bande B de tôle métallique. Ainsi, cette installation comporte, comme connu en soi, un système 2 de maintien de la traction en entrée du laminoir. Ce système comporte une dérouleuse 4 dans le cas d'un laminoir bobine à bobine ou un bloc en S dans le cas d'un laminoir continu, dont la vitesse de déroulement est commandée par une unité 6 de pilotage du couple.On the Fig. 1 is schematically illustrated a cold rolling installation 1 of a strip B of metal sheet. Thus, this installation comprises, as known per se, a system 2 for maintaining traction at the input of the rolling mill. This system comprises a unwinder 4 in the case of a roll-to-roll mill or an S-block in the case of a continuous rolling mill, whose unwinding speed is controlled by a torque control unit 6.

L'installation de laminage sur laquelle peut s'appliquer cette invention comporte au moins une cage 8, mais peut en comporter deux ou plus. L'invention s'applique aussi bien aux laminoirs de type « réversible », dans lesquels la bande B circule dans la cage 8 alternativement selon deux directions de défilement opposées, qu'aux laminoirs dans lesquels la bande B circule selon une direction de défilement unique.The rolling plant on which this invention can be applied comprises at least one cage 8, but may comprise two or more. The invention applies both to rolling mills of the "reversible" type, in which the band B circulates in the cage 8 alternately in two opposite direction of travel, than to the rolling mills in which the band B circulates in a single direction of travel. .

Comme connu en soi, la cage 8 du laminoir comporte deux cylindres de travail 10 à axes parallèles entre lesquels circule la bande B. Ces cylindres sont entraînés en rotation par des moteurs d'entraînement dont la vitesse est régulée en fonction d'une consigne prédéterminée u. La cage 8 comporte un dispositif de serrage hydraulique ou électromécanique 12 permettant de transmettre aux deux cylindres de travail 10 l'effort de laminage nécessaire afin que ceux-ci assurent la réduction d'épaisseur prédéterminée. Ce dispositif 12 assure un réglage de l'entrefer séparant les deux cylindres 10, c'est-à-dire l'écartement des cylindres 10. L'effort de laminage est transmis du dispositif 12 aux cylindres de travail 10 au travers d'un empilage d'un ou plusieurs cylindres d'appui 14, exception faite des cages duo, ou l'effort est transmis directement du dispositif 12 aux cylindres de travail 10.As known per se, the rolling mill stand 8 comprises two working rolls 10 with parallel axes between which the band B circulates. These rolls are rotated by drive motors whose speed is regulated according to a predetermined set point. u. The cage 8 comprises a hydraulic or electromechanical clamping device 12 making it possible to transmit to both the working rolls 10 the rolling force necessary so that they ensure the predetermined thickness reduction. This device 12 provides an adjustment of the gap separating the two cylinders 10, that is to say the spacing of the cylinders 10. The rolling force is transmitted from the device 12 to the working cylinders 10 through a stacking one or more support cylinders 14, except the duo cages, where the force is transmitted directly from the device 12 to the working cylinders 10.

Une jauge 16 d'épaisseur Je est disposée en amont de la cage 8. Cette jauge 16 est propre à déterminer en continu l'épaisseur de la bande B avant son entrée dans la cage 8.A gauge 16 of thickness J e is disposed upstream of the cage 8. This gauge 16 is able to continuously determine the thickness of the band B before entering the cage 8.

De même, une seconde jauge 18 d'épaisseur Js est disposée en aval de la cage 8. Elle est propre à déterminer en continu l'épaisseur de la bande B après son laminage dans la cage 8.Similarly, a second gauge 18 of thickness J s is disposed downstream of the cage 8. It is capable of continuously determining the thickness of the strip B after its rolling in the cage 8.

Par ailleurs, un capteur 20 de vitesse Ve est disposé en entrée de la cage 8. Il est propre à déterminer en continu la vitesse linéaire instantanée de circulation de la bande B en entrée de la cage 8. Le capteur est formé par exemple d'un vélocimètre laser.Furthermore, a speed sensor V e is disposed at the input of the cage 8. It is capable of continuously determining the instantaneous linear speed of circulation of the strip B at the input of the cage 8. The sensor is formed, for example, of a laser velocimeter.

De même, un capteur 22 de vitesse Vs est disposé en sortie de la cage 8. Il est propre à déterminer en continu la vitesse linéaire instantanée de circulation de la bande B en sortie de la cage 8. Le capteur est formé par exemple d'un vélocimètre laser.Similarly, a speed sensor V S is disposed at the output of the cage 8. It is capable of continuously determining the instantaneous linear speed of circulation of the strip B at the outlet of the cage 8. The sensor is formed, for example, of a laser velocimeter.

Un régulateur 24 de l'épaisseur de sortie est prévu pour exploiter les mesures réalisées par les jauges d'épaisseur 16 et 18 et par les capteurs de vitesse 20 et 22. Ce régulateur 24 utilise l'écartement entre les cylindres 10 pour réguler cette épaisseur.An outlet thickness regulator 24 is provided to exploit the measurements made by the thickness gauges 16 and 18 and by the speed sensors 20 and 22. This regulator 24 uses the distance between the rolls 10 to regulate this thickness. .

En référence à la Fig. 2, on décrit plus précisément le fonctionnement du régulateur 24.With reference to the Fig. 2 , the operation of the regulator 24 is more precisely described.

La mesure de la jauge 18 d'épaisseur Js est utilisée dans la régulation de l'épaisseur de la bande afin de corriger l'écartement des cylindres 10. A cet effet, le régulateur 24 reçoit une consigne d'épaisseur de sortie de la cage Jcs correspondant à l'épaisseur souhaitée en sortie de cage. On soustrait l'épaisseur mesurée JS à cette épaisseur de consigne JCS afin de connaître l'écart d'épaisseur entre l'épaisseur mesurée et l'épaisseur souhaitée, ce qui permet de calculer une correction à effectuer dans l'écartement des cylindres 10 pour obtenir l'épaisseur souhaitée en sortie de cage 8.The measurement of the gauge 18 of thickness J s is used in the regulation of the thickness of the strip in order to correct the spacing of the rolls 10. For this purpose, the regulator 24 receives an instruction of thickness of exit of the cage Jcs corresponding to the desired thickness at the exit of cage. The measured thickness J S is subtracted from this setpoint thickness J CS in order to know the difference in thickness between the measured thickness and the desired thickness, which makes it possible to calculate a correction to be made in the spacing of the rolls 10 to obtain the desired thickness at the exit of the cage 8.

La mesure de l'épaisseur Js en aval de la cage est combinée, comme représenté sur la Fig. 2, avec la prédiction de l'épaisseur en sortie de la cage selon la loi des débits. A cet effet, le régulateur 24 reçoit les mesures effectuées par le capteur 20 de vitesse Ve en entrée de la cage 8, par la jauge 16 d'épaisseur Je en entrée de la cage 8 et par le capteur 22 de vitesse Vs en sortie de la cage. Le régulateur est agencé, par l'intermédiaire d'un multiplicateur 26, pour déterminer la prédiction de l'épaisseur de la bande en sortie de cage Es selon la relation Es = Je.Ve/Vs.The measurement of the thickness J s downstream of the cage is combined, as shown in FIG. Fig. 2 , with the prediction of the thickness at the outlet of the cage according to the law of flow rates. For this purpose, the controller 24 receives the measurements taken by the sensor 20 of speed V e at the input of the cage 8, the gauge 16 of thickness e J input of the cage 8 and the sensor 22 of speed V s at the exit of the cage. The regulator is arranged, via a multiplier 26, to determine the prediction of the thickness of the band at the cage exit E s according to the relation E s = J e .V e / V s .

On notera que la mesure de l'épaisseur Je en entrée de la cage 8 est fournie au multiplicateur 26 en passant par une ligne de retard 28 afin de tenir compte du décalage temporaire correspondant au temps de transfert de la bande B entre le point de mesure de l'épaisseur Je de la bande B en amont de la cage 8 et la cage 8, c'est-à-dire pour tenir compte de la distance entre l'endroit où est effectuée la mesure Je et la cage 8.It will be noted that the measurement of the thickness J e at the entrance of the cage 8 is supplied to the multiplier 26 via a delay line 28 in order to take account of the temporary offset corresponding to the transfer time of the band B between the measuring the thickness J e of the strip B upstream of the cage 8 and the cage 8, that is to say to take into account the distance between the place where the measurement J e is made and the cage 8 .

Ainsi, en sortie du multiplicateur 26, on obtient l'estimation de l'épaisseur Es en sortie de la cage 8 selon la loi des débits.Thus, at the output of the multiplier 26, the estimate of the thickness E s at the output of the cage 8 is obtained according to the law of flow rates.

Cette estimation Es est comparée à la consigne d'épaisseur JCS en sortie de cage. A cet effet, l'estimation Es est soustraite à la consigne d'épaisseur JCS pour constituer une prédiction de l'erreur d'épaisseur en sortie de la cage 8.This estimate E s is compared to the thickness setpoint J CS at the exit of the cage. For this purpose, the estimate E s is subtracted from the thickness setpoint J CS to constitute a prediction of the thickness error at the exit of the cage 8.

Cette prédiction des erreurs d'épaisseur en sortie de la cage 8 passe par une ligne de retard 30 afin de tenir compte du décalage temporaire correspondant au temps de transfert de la bande B de la cage 8 au point de mesure de l'épaisseur Js de la bande en aval de la cage 8 et par un modèle 32 de la jauge d'épaisseur 18 de sortie de la cage 8. La valeur obtenue est soustraite à la prédiction des erreurs d'épaisseur en sortie de la cage 8 et constitue l'erreur d'épaisseur en sortie de la cage 8 à prendre en compte par le régulateur 24 pendant le temps de transport de la bande de la sortie de la cage 8 à la jauge d'épaisseur de sortie 18.This prediction of the thickness errors at the exit of the cage 8 passes through a delay line 30 in order to take account of the temporary offset corresponding to the transfer time of the band B of the cage 8 to the measurement point of the thickness J s of the strip downstream of the cage 8 and a model 32 of the thickness gauge 18 output of the cage 8. The value obtained is subtracted from the prediction of the thickness errors at the output of the cage 8 and constitutes the thickness error at the outlet of the cage 8 to be taken into account by the regulator 24 during the transport time of the strip from the exit of the cage 8 to the output thickness gauge 18.

Les erreurs d'épaisseur obtenues par la mesure de l'épaisseur Js en sortie de cage 8 et par l'estimation de l'épaisseur selon la loi des débits sont additionnées, ce qui permet de calculer la correction Ce à effectuer sur l'écartement des cylindres 10 pour obtenir l'épaisseur de bande B souhaitée en sortie de cage 8 à l'aide du régulateur 24. Ainsi, la correction Ce tient compte à la fois de l'épaisseur mesurée en aval de la cage et de l'estimation de l'épaisseur de la bande selon la loi des débits. La prise en compte simultanée de ces deux régulations permet d'éviter les corrections parasites et contradictoires rencontrées lorsque les deux régulations sont utilisées en parallèle. Ainsi, on réduit les perturbations sur l'épaisseur de la bande B en sortie de la cage 8 et on améliore les performances du laminoir.The thickness errors obtained by measuring the thickness J s at the exit of cage 8 and by the estimation of the thickness according to the law of the flow rates are added, which makes it possible to calculate the correction Ce to be carried out on the spacing of the rolls 10 to obtain the desired band thickness B at the outlet of the cage 8 by means of the regulator 24. Thus, the correction Ce takes account of both the thickness measured downstream of the cage and the the estimation of the thickness of the strip according to the law of flow rates. The simultaneous taking into account of these two regulations makes it possible to avoid the parasitic and contradictory corrections encountered when the two regulations are used in parallel. Thus, disturbances are reduced on the thickness of the strip B at the outlet of the cage 8 and the performance of the rolling mill is improved.

Ainsi donc, la correction de l'écartement des cylindres 10 pour la bande B au moment de son passage dans la cage n'est fonction que de l'estimation de l'épaisseur de cette bande selon la loi des débits. Et lorsque la valeur réelle de l'épaisseur de ladite bande B est connue via la mesure de la jauge de l'épaisseur Js de sortie en aval de la cage 8, la prédiction de l'épaisseur par la loi des débits n'est plus nécessaire et n'est donc plus prise en compte à l'aide des dispositifs 30 et 32.Thus, the correction of the spacing of the rolls 10 for the band B at the moment of its passage in the cage depends only on the estimation of the thickness of this band according to the law of flow rates. And when the real value of the thickness of said strip B is known via measurement of the thickness gauge J s output downstream of the cage 8, the prediction of the thickness by the law of the flow rates is more necessary and is therefore no longer taken into account using devices 30 and 32.

La correction Ce est appliquée sur l'écartement des cylindres 10 par l'intermédiaire du dispositif de serrage 12, comme représenté sur la Fig. 1. Cette action modifie l'épaisseur de la bande B en sortie de cage 8.The correction It is applied to the spacing of the rolls 10 by means of the clamping device 12, as shown in FIG. Fig. 1 . This action modifies the thickness of the band B at the exit of cage 8.

La correction Ce, comme représenté sur la Fig.2, est également utilisée par une unité de compensation d'inertie 34, reliée à l'unité de pilotage de couple 6. Le filtre 34 est propre à déterminer à partir de la correction Ce et des caractéristiques mécaniques de la bande B, la correction de couple Cc qui doit être imposée au système 2 de maintien de la traction en entrée du laminoir. De manière connue en soi, la correction Ce est fournie à un filtre 34 permettant de réaliser la compensation d'inertie, comme représenté sur la Fig. 2.The correction Ce, as represented on the Fig.2 , is also used by an inertial compensation unit 34, connected to the torque control unit 6. The filter 34 is able to determine from the correction Ce and the mechanical characteristics of the band B, the correction of torque C c which must be imposed on the system 2 for maintaining traction at the input of the rolling mill. In a manner known per se, the correction Ce is supplied to a filter 34 making it possible to perform the inertia compensation, as shown in FIG. Fig. 2 .

Dans le cas d'un laminoir dans lequel la bande B circule alternativement selon deux directions opposées, du fait que les mêmes instruments de mesure sont disposés de part et d'autre de la cage 8, la correction de l'écartement des cylindres 10 peut se faire pour les deux directions. Pour se faire, dans la direction opposée de défilement, on inverse le rôle des jauges d'épaisseur 16 et 18 et des capteurs de vitesse 20 et 22. C'est-à-dire que la jauge d'épaisseur 18 sert à mesurer l'épaisseur en amont de la cage, tandis que la jauge d'épaisseur 16 sert à mesurer l'épaisseur en aval, et le capteur de vitesse 22 sert à mesurer la vitesse en entrée de la cage tandis que le capteur de vitesse 20 sert à mesurer la vitesse en sortie.In the case of a rolling mill in which the band B circulates alternately in two opposite directions, because the same measuring instruments are arranged on either side of the cage 8, the correction of the spacing of the rolls 10 may to be done for both directions. To do this, in the opposite direction of travel, the role of the thickness gauges 16 and 18 and the speed sensors 20 and 22 is reversed. That is to say, the thickness gauge 18 serves to measure thickness upstream of the cage, while the thickness gauge 16 serves to measure the thickness downstream, and the speed sensor 22 is used to measure the speed at the entrance of the cage while the speed sensor 20 is used to measure the output speed.

Dans le cas où plusieurs cages sont prévues, pour la dernière cage par rapport au sens de défilement de la bande B, la correction peut être appliquée sur la vitesse de rotation des cylindres au lieu de l'écartement des cylindres 10 de façon connue.In the case where several cages are provided, for the last cage with respect to the running direction of the band B, the correction can be applied to the speed of rotation of the rolls instead of the spacing of the rolls 10 in a known manner.

Claims (9)

  1. A method for controlling the rolling of a sheet strip (B) including the continuous passing of the strip along at least one running direction in at least one cage (8) including at least two driven cylinders (10) between which the strip (B) circulates and undergoes crushing, comprising the following steps:
    - measuring the thickness (Js) of the strip downstream from the cage (8) relatively to the running direction,
    - estimating the thickness (Es) of the strip upon exiting the cage (8) according to the flow law,
    - correcting (Ce) the spacing of the cylinders (10) or their speed of rotation, both according to the thickness (Js) measured downstream from the cage (8) and to the estimation of the thickness (Es) of the strip according to the flow law,
    characterized in that the step for correcting (Ce) the spacing of the cylinders (10) or their speed of rotation, both according to the thickness (Js) measured downstream from the cage (8) and to the estimation of the thickness (Es) of the strip according to the flow law is achieved by means of a single regulator.
  2. The rolling control method according to claim 1, characterized in that the estimation of the thickness (Es) of the strip upon exiting the cage according to the flow law, comprises the measurement of the thickness (Je) and of the running speed (Ve) of the strip upstream from the cage (8) and the measurement of the running speed (Vs) of the strip downstream from the cage (8), the estimation of the thickness (Es) of the strip upon exiting the cage (8) being given by the relationship Es = JeVe/Vs.
  3. The rolling control method according to claim 2, characterized in that the estimation of the thickness (Es) of the strip upon exiting the cage according to the flow law, takes a temporary shift into account corresponding to the transfer time of the strip (B) between the measurement point of the thickness (Je) of the strip upstream from the cage (8) and the cage (8).
  4. The rolling control method according to any of claims 1 to 3, characterized in that for a given area of the strip, the correction of the spacing of the cylinders (10) or their speed of rotation, both according to the thickness (Js) measured downstream from the cage (8) and of the estimation of the thickness (Es) of the strip according to the flow law is immediately achieved when said area passes under the cage (8).
  5. The rolling control method according to any of claims 1 to 4, characterized in that the estimation of the thickness (Es) of the strip according to the flow law is integrated to the correction of the spacing of the cylinders (10) or of their speed of rotation by taking into account a temporary shift corresponding to the transfer time of the strip (B) from the cage (8) to the measurement point of the thickness (Js) measured downstream from the cage.
  6. The rolling control method according to any of claims 1 to 5, characterized in that it includes the control of a device (6) for maintaining traction located upstream from the cage (8), and in that said control takes into account the correction (Ce) of the spacing of the cylinders or of their speed of rotation.
  7. The rolling control method according to any of claims 1 to 6, characterized in that the strip (B) circulates in the cage (8) alternately along two running directions opposite to each other, the correction (Ce) of the spacing of the cylinders or of their speed of rotation according to the measured thickness (Js) downstream from the cage (8) and to the estimation of the thickness (Es) of the strip (B) according to the flow law being achieved for each of said directions.
  8. The rolling control method according to any of claims 1 to 6, characterized in that the strip (B) circulates in at least two successive cages (8), the method comprising a step for correcting the spacing of the cylinders (10) for the first cage (8) relatively to the running direction of the strip and a step for correcting the speed of rotation of the cylinders for the last cage relatively to the running direction of the strip (B), said correction steps being achieved both from the measured thickness (Js) downstream from the cage and from the estimation of the thickness (Es) of the strip according to the flow law.
  9. A device for controlling the rolling of a sheet strip comprising at least one cage (8) including at least two driven cylinders (10) between which the strip circulates and undergoes crushing, comprising:
    - means for measuring the thickness (18) of the strip downstream from the cage (8),
    - means for measuring the thickness (16) of the strip and the running speed (20) of the strip upstream from the cage,
    - means for measuring the running speed (22) of the strip downstream from the cage (8),
    - means for correcting the spacing of the cylinders or their speed of rotation,
    characterized in that it comprises means for applying a method according to any of claims 1 to 8.
EP20090305933 2008-10-01 2009-10-01 Process for controlling rolling of a sheet metal strip Active EP2172282B1 (en)

Applications Claiming Priority (1)

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FR0856633A FR2936436B1 (en) 2008-10-01 2008-10-01 METHOD FOR CONTROLLING THE ROLLING OF A TAPE

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EP2823901A1 (en) * 2013-07-11 2015-01-14 Siemens Aktiengesellschaft Reversing rolling mill with earliest possible activation of a thickness regulation
CN108080413A (en) * 2017-12-15 2018-05-29 唐山全丰薄板有限公司 Technique under a kind of roughing chain-drive section weight

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JPS6096320A (en) * 1983-10-28 1985-05-29 Nippon Steel Corp Automatic sheet-thickness control method of cold rolling mill
JPS6186019A (en) * 1984-10-03 1986-05-01 Nippon Steel Corp Plate thickness controlling method in steel plate rolling
JPS63171214A (en) * 1987-01-09 1988-07-15 Hitachi Ltd Plate thickness automatic control device
JP3041135B2 (en) * 1992-06-19 2000-05-15 株式会社東芝 Control device for continuous hot rolling mill

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FR2936436B1 (en) 2011-04-22
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FR2936436A1 (en) 2010-04-02

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