EP0747143A1 - Process and equipment for cold-rolling with compensation of the circularity error of the rolls - Google Patents

Process and equipment for cold-rolling with compensation of the circularity error of the rolls Download PDF

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Publication number
EP0747143A1
EP0747143A1 EP96401181A EP96401181A EP0747143A1 EP 0747143 A1 EP0747143 A1 EP 0747143A1 EP 96401181 A EP96401181 A EP 96401181A EP 96401181 A EP96401181 A EP 96401181A EP 0747143 A1 EP0747143 A1 EP 0747143A1
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EP
European Patent Office
Prior art keywords
cage
compensation
rolling
signal
measurement
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EP96401181A
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German (de)
French (fr)
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EP0747143B1 (en
Inventor
Regis Mieze
Gérard Robert
Daniel Piquet
Christophe Silvy Leligois
Michel Abikaram
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Usinor En Kvaerner Metals Clecim
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Kvaerner Metals Clecim SA
Sollac SA
Clecim SAS
Lorraine de Laminage Continu SA SOLLAC
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    • 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
    • B21B37/66—Roll eccentricity compensation systems
    • 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
    • B21B1/40—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 foils which present special problems, e.g. because of thinness

Definitions

  • the invention relates to a method and an installation for rolling thin sheets, in particular steel sheets.
  • This regularity of thickness is even more critical when preparing thin sheets, in particular sheets for packaging and / or for beverage cans.
  • the strips are generally laminated in installations comprising a succession of rolling stands, by passing them through the air gap of each stand, delimited by the rolling rolls.
  • rolling is carried out by controlling each cage of the installation, in particular on the basis of instructions for traction between the cages and / or for tightening the strip to be laminated between two working rolls of a cage.
  • a rolling installation comprising three rolling stands C1, C2, C3 can be carried out by a control device S, in particular on the basis of the measurement of the interlage traction of the strip B by sensors. T2, T3 and / or by acting on the successive tightening means of each cage A1, A2, A3.
  • the strictly circular nature of the rolling rolls is one of the conditions for obtaining a constant thickness over the length of the strip.
  • runout defects These variations in strip thickness are called runout defects or eccentricity defects.
  • Such a variation in thickness of metal strip is not tolerable for most uses, in particular in the field of packaging and beverage cans.
  • the rolling stands of the installation are rotated "empty” by applying a tightening instruction for the working rolls of each stand and identifying the defect "runout” by measuring, in amplitude and in phase, the force variations between said rolls, then, in a second step during the rolling of a strip, a tightening instruction is applied to the rolls of each cage compensation signal for the runout of the same amplitude as the fault previously measured, but in phase opposition.
  • Such a run-out compensation method is a delayed-time compensation method which is not effective when the failure to runout is not constant, especially when it varies during rolling, for example under the effect of deformations of the rolls resulting from thermal stresses.
  • a second real-time runout compensation method is known, according to which, during rolling, the thickness of the strip at the outlet of each stand is measured, the periodic variations in thickness are identified which correspond to the frequencies of rotation of the cylinders and which have a constant phase shift with it, and the amplitude and the phase of the signal to be applied to the tightening instruction are deduced therefrom to compensate for the runout.
  • a runout compensation device is added to the installation described above and includes thickness sensors E1, E2 arranged downstream of said cages, sensors for the angular position of the cylinders V1, V2 and compensators P1, P2.
  • the compensators P1, P2 evaluate the clamping setpoint compensation signal to be applied to the clamping means A1, A2 of the cages C1, C2 for Eliminate runout faults in the cylinders.
  • the thickness measurement sensor is always offset by a few meters, for example 2.5 m, after leaving the air gap of a cage, which causes a delay in the identification of runout faults of the cylinders of said cage in relation to the creation of the defect itself at the level of the air gap of the cage.
  • the delay in detecting the fault can be of the order of 0.5 s for a cage-sensor distance of 2.5 m and a speed of travel of the strip in the cage of 300 m / min.
  • the thickness measurement signal supplied by the sensors E1, E2 presented a significant noise and that it was often difficult to discriminate the periodic variations in thickness of the strip relating to the out of round faults of the cylinders compared to other thickness variations from other origins.
  • the thickness measurement signal is analyzed in frequency, in particular by Fourier transform, the signals which correspond to the frequency of rotation of the cylinders of the cages C1, C2 and a compensation signal is generated from these extracted signals.
  • the lengthening of the integration time further increases the delay in detecting the fault in the run-out compared to the time of creation of the fault itself.
  • the result is an overall response time of the regulation of the compensation device that is far too long, during which the thickness defects of a running tape is not corrected correctly.
  • the out-of-round compensation regulation loop will have a response time of the order of several tens of seconds.
  • the real-time runout compensation method does not yet have the performance required to ensure a sufficiently uniform thickness guarantee over an entire rolled strip, in particular in the case of rolling thin sheets.
  • the object of the invention is to provide a rolling process which makes it possible to laminate a metal strip with very great thickness regularity along the strip.
  • the object of the invention is also to provide a reliable and economical device for implementing this method.
  • the subject of the invention is a method of cold rolling a strip between the rolls of rolling stands arranged one after the other, in which a modification is made in real time to the tightening set point of the cylinders of at least one of said cages, for compensate for the run-out faults of the cylinders of said cage and in which said modification is evaluated by analyzing in frequency a measurement signal of a rolling parameter specific to said cage and by extracting from the measurement signal, the periodic variations of the signal whose frequencies correspond to the rotational speeds of said cylinders, so as to obtain a compensation signal proportional to said periodic variations, characterized in that said measurement is a measurement of traction of the strip immediately upstream of said cage.
  • the subject of the invention is also a rolling installation comprising a succession of rolling stands, interage traction measuring sensors, clamping means for each cage, a control device, in particular for regulating said clamping means and at least means for compensating for runout faults in the rolling rolls of a cage of the succession of cages connected to the clamping means of said cage for delivering a signal for compensating for runout faults, characterized in that the compensation device is also connected to an interage traction measurement sensor located immediately upstream of said cage (C2, C3) to receive the measurement signal from the traction measurement sensor (T2, T3) and evaluate said compensation signal.
  • C2, C3 interage traction measurement sensor located immediately upstream of said cage
  • the rolling installation comprises three rolling stands C1, C2, C3, a control device S, interage traction measurement sensors T2, T3, clamping means A1, A2, A3 cages C1, C2, C3 and compensation devices P'2, P'3.
  • the measurement of the inter-cage traction corresponds to the tension of the strip between each cage and the sensors T2, T3 provided for this purpose are for example tensiometers with deflectors.
  • the clamping means A1, A2, A3 are mainly controlled by a setpoint delivered by the control device S.
  • the compensation devices P'2, P'3 have the function, as previously for the compensators P2, P3, of evaluating the compensation signal intended to correct in real time the tightening instruction of the tightening means A2, A3 of the cages C2, C3 with a view to eliminating the defect in the roundness of the cylinders of said cages.
  • the compensation devices P2 and P3 are connected to the traction sensors T2 and T3.
  • the rolling rolls of the cages C2, C3 are rectified but have ovalization or runout defects, which would cause, during rolling without compensation, variations in the air gap between the working rolls.
  • a strip B is laminated by regulating the operation of the cages C1, C2, C3 of the installation using the control device S, in particular on the basis of the interage traction measurement of the strip B by the sensors T2, T3 and by acting on the successive tightening means of each cage A1, A2, A3.
  • the compensators P'2, P'3 deliver said compensation signal to the clamping means A2, A3 by evaluating said signal from the measurement signal delivered by the sensors T2, T3 upstream of the cages C2, C3 .
  • the invention is therefore applicable from the second stand of the rolling installation and until the last without installing additional sensors, since traction measurement sensors T2, T3 are already installed between each cage to allow the device S to control the rolling installation in a conventional manner.
  • the compensation device P'2 is adapted in a manner known per se to extract from the signal from the sensor T2 the periodic variations in the traction of the band B upstream of the cage C2 which have an equal frequency at the speed of rotation of the cylinders of the cage C2 and to generate a compensation signal proportional to said extracted variations.
  • the compensation device P'2 also takes into account the harmonics of the runout faults, that is to say the periodic variations in the traction of the band B which have a frequency multiple of the speed of rotation of the cylinders of the cage C2.
  • the traction measurement signal could be integrated over a much shorter duration than in the methods of the prior art while detecting, in a reliable and precise manner, the out of round faults of the cage cylinders C2.
  • the two working cylinders of the cage C2 may have slightly different rotational speeds, in particular due to slight differences in diameter, it is not necessary to choose a sufficiently long integration time to allow discriminate the runout defect of one of the cylinders with respect to the other and it is sufficient to evaluate the compensation signal from the average amplitude of the measured defect.
  • the signal for detecting runout faults has much less noise when it comes from the measurement of the traction of a sensor T2 upstream of the cage C2 than when it comes in particular measuring the thickness of a sensor E2 downstream of the cage C2, as in the method of the prior art shown in FIG. 2.
  • the runout fault sensor is a traction sensor, there is no delay between the appearance of a fault and its detection, unlike the method of the prior art.
  • the compensation devices are programmed to analyze in frequency the measurement signals with much shorter integration times than in the prior art.
  • the overall response time of the compensation regulation of the runout according to the method of the invention is only about 2.5 revolutions of the cylinder, or about 2.5 seconds.
  • the response time of the clamping means and the maximum clamping speed of these means can be limiting and critical factors for the implementation of the method according to the invention; preferably, the response time of the clamping means must remain less than the duration of a rotation of the cylinders.
  • the compensation device and its operation which are described for the cage 2 are also applicable to the cage 3, or to other possible cages downstream.
  • metal strips having longitudinal variations in thickness of less than 5 ⁇ m are obtained at the rolling exit. ie less than 0.7% for an average thickness of 0.26 mm.

Abstract

The rolling mill consists of stands (C1,C2,C3) situated one after the other for the steel strip to (B) pass through. The positions of the rollers in, at least, one of the stands, is modified in real time to compensate for ovalisation of the rollers. The adjustment of the roller positions is made on the basis of an analysis of a signal frequency corresponding to the rollers' rotation. The aim of the adjustment is to obtain a compensation signal which is in proportion to periodic variations in speed. The adjustment of the rollers is made by a compensating unit (P'2,P'3) which is connected to traction measurement detectors (T2,T3) in the form of deflection tensiometers between the stands.

Description

L'invention concerne un procédé et une installation de laminage de tôles minces, notamment de tôles en acier.The invention relates to a method and an installation for rolling thin sheets, in particular steel sheets.

Pour la préparation d'une bande de tôles par laminage, on accorde une grande importance à la régularité d'épaisseur, notamment le long de la bande, ou de la direction de laminage.For the preparation of a strip of sheets by rolling, great importance is given to the regularity of thickness, in particular along the strip, or of the direction of rolling.

Cette régularité d'épaisseur est encore plus critique quand on prépare des tôles minces, notamment des tôles pour emballage et/ou pour des boîtes de boisson.This regularity of thickness is even more critical when preparing thin sheets, in particular sheets for packaging and / or for beverage cans.

On lamine généralement les bandes dans des installations comportant une succession de cages de laminage, en les faisant défiler dans l'entrefer de chaque cage, délimité par les cylindres de laminage.The strips are generally laminated in installations comprising a succession of rolling stands, by passing them through the air gap of each stand, delimited by the rolling rolls.

D'une manière classique, on procède au laminage en pilotant chaque cage de l'installation, notamment sur la base de consignes de traction entre les cages et/ou de serrage de la bande à laminer entre deux cylindres de travail d'une cage.In a conventional manner, rolling is carried out by controlling each cage of the installation, in particular on the basis of instructions for traction between the cages and / or for tightening the strip to be laminated between two working rolls of a cage.

Ainsi, en se reportant à la figure 1, une installation de laminage comportant trois cages de laminage C1, C2, C3 peut être conduite par un dispositif de pilotage S, notamment à partir de la mesure de traction intercage de la bande B par des capteurs T2, T3 et/ou en agissant sur les moyens de serrage successifs de chaque cage A1, A2, A3.Thus, with reference to FIG. 1, a rolling installation comprising three rolling stands C1, C2, C3 can be carried out by a control device S, in particular on the basis of the measurement of the interlage traction of the strip B by sensors. T2, T3 and / or by acting on the successive tightening means of each cage A1, A2, A3.

Le caractère strictement circulaire des cylindres de laminage est une des conditions pour obtenir une épaisseur constante sur la longueur de la bande.The strictly circular nature of the rolling rolls is one of the conditions for obtaining a constant thickness over the length of the strip.

Néanmoins, les méthodes d'usinage des cylindres de laminage ne permettent pas d'atteindre une forme parfaitement circulaire et les cylindres présentent souvent une légère ovalisation.However, the methods of machining the rolling rolls do not allow a perfectly circular shape to be achieved and the rolls often have a slight ovalization.

Et même lorsque la rectification permet d'atteindre une forme circulaire, une légère ovalisation peut quand même apparaître ou s'accentuer sur les cylindres en service, sous l'effet, par exemple, de contraintes thermiques.And even when the rectification achieves a circular shape, a slight ovalization can still appear or be accentuated on the cylinders in service, under the effect, for example, of thermal stresses.

Cette légère ovalisation des cylindres de laminage, qu'on appelle aussi "faux rond" ou "excentricité", se traduit par exemple par des variations de quelques dizaines de micromètres de l'entrefer entre deux cylindres de travail d'une cage de laminage, en cours de laminage.This slight ovalization of the rolling rolls, also called "runout" or "eccentricity", results for example in variations of a few tens of micrometers of the air gap between two working rolls of a rolling stand, during rolling.

Ces variations de l'épaisseur de l'entrefer sont périodiques, présentent une fréquence proportionnelle à la vitesse de rotation des cylindres et provoquent des variations périodiques d'épaisseur le long de la bande de tôle en sortie de chaque cage de laminage.These variations in the thickness of the air gap are periodic, have a frequency proportional to the speed of rotation of the rolls and cause periodic variations in thickness along the strip of sheet metal at the outlet of each rolling stand.

Ces variations d'épaisseur de la bande sont appelés défauts de faux rond ou défauts d'excentricité.These variations in strip thickness are called runout defects or eccentricity defects.

Ces variations d'épaisseur sont typiquement de l'ordre de 0,5 µm pour chaque cage d'une installation, ce qui représenterait une variation de 0,2 % sur une bande d'épaisseur 0,25 mm .These variations in thickness are typically of the order of 0.5 μm for each cage of an installation, which would represent a variation of 0.2% on a strip of thickness 0.25 mm.

Une telle variation d'épaisseur de bande métallique n'est pas tolérable pour la plupart des utilisations, notamment dans le domaine de l'emballage et des boîtes de boisson.Such a variation in thickness of metal strip is not tolerable for most uses, in particular in the field of packaging and beverage cans.

On connaît des procédés pour compenser en cours de laminage cette ovalisation ou "faux rond" des cylindres et obtenir une épaisseur plus régulière le long de la bande.Methods are known to compensate during rolling this ovalization or "runout" of the rolls and obtain a more regular thickness along the strip.

Selon le premier procédé, dans une première étape préalable au laminage d'une bande, on fait tourner "à vide" les cages de laminage de l'installation en appliquant une consigne de serrage des cylindres de travail de chaque cage et on repère le défaut de "faux rond" en mesurant, en amplitude et en phase, les variations de force entre lesdits cylindres, puis, dans une deuxième étape au cours du laminage d'une bande, on applique à la consigne de serrage des cylindres de chaque cage un signal de compensation du faux rond de même amplitude que le défaut préalablement mesuré, mais en opposition de phase.According to the first method, in a first step prior to the rolling of a strip, the rolling stands of the installation are rotated "empty" by applying a tightening instruction for the working rolls of each stand and identifying the defect "runout" by measuring, in amplitude and in phase, the force variations between said rolls, then, in a second step during the rolling of a strip, a tightening instruction is applied to the rolls of each cage compensation signal for the runout of the same amplitude as the fault previously measured, but in phase opposition.

Un tel procédé de compensation du faux rond est un procédé de compensation en temps différé qui n'est pas efficace lorsque le défaut de faux-rond n'est pas constant, notamment lorsqu'il varie en cours de laminage, par exemple sous l'effet de déformations des cylindres résultant de contraintes thermiques.Such a run-out compensation method is a delayed-time compensation method which is not effective when the failure to runout is not constant, especially when it varies during rolling, for example under the effect of deformations of the rolls resulting from thermal stresses.

On connaît un second procédé de compensation de faux rond en temps réel, selon lequel, en cours de laminage, on mesure l'épaisseur de la bande à la sortie de chaque cage, on repère les variations périodiques de l'épaisseur qui correspondent aux fréquences de rotation des cylindres et qui présentent un déphasage constant avec elle, et on en déduit l'amplitude et la phase du signal à appliquer à la consigne de serrage pour compenser le faux rond.A second real-time runout compensation method is known, according to which, during rolling, the thickness of the strip at the outlet of each stand is measured, the periodic variations in thickness are identified which correspond to the frequencies of rotation of the cylinders and which have a constant phase shift with it, and the amplitude and the phase of the signal to be applied to the tightening instruction are deduced therefrom to compensate for the runout.

A cet effet, en se reportant à la figure 2, un dispositif de compensation de faux rond est adjoint à l'installation précédemment décrite et comporte des capteurs d'épaisseur E1, E2 disposés en aval desdites cages, des capteurs de position angulaire des cylindres V1, V2 et des compensateurs P1, P2.To this end, with reference to FIG. 2, a runout compensation device is added to the installation described above and includes thickness sensors E1, E2 arranged downstream of said cages, sensors for the angular position of the cylinders V1, V2 and compensators P1, P2.

A partir des signaux fournis par les capteurs E1, V1 pour P1, et E2, V2 pour P2, les compensateurs P1, P2 évaluent le signal de compensation de consigne de serrage à appliquer aux moyens de serrage A1, A2 des cages C1, C2 pour éliminer les défauts de faux rond des cylindres.From the signals supplied by the sensors E1, V1 for P1, and E2, V2 for P2, the compensators P1, P2 evaluate the clamping setpoint compensation signal to be applied to the clamping means A1, A2 of the cages C1, C2 for Eliminate runout faults in the cylinders.

Un tel procédé de compensation du faux rond en temps réel nécessite donc l'installation de nombreux capteurs de mesure au niveau de chaque cage.Such a real-time runout compensation method therefore requires the installation of numerous measurement sensors at each cage.

Le capteur de mesure d'épaisseur est toujours décalé de quelques mètres, par exemple 2,5 m, après la sortie de l'entrefer d'une cage, ce qui provoque un retard dans le repérage des défauts de faux rond des cylindres de ladite cage par rapport à la création du défaut lui-même au niveau de l'entrefer de la cage.The thickness measurement sensor is always offset by a few meters, for example 2.5 m, after leaving the air gap of a cage, which causes a delay in the identification of runout faults of the cylinders of said cage in relation to the creation of the defect itself at the level of the air gap of the cage.

Ainsi, le retard de la détection du défaut peut être de l'ordre de 0,5 s pour une distance cage-capteur de 2,5 m et une vitesse de défilement de la bande dans la cage de 300 m/min.Thus, the delay in detecting the fault can be of the order of 0.5 s for a cage-sensor distance of 2.5 m and a speed of travel of the strip in the cage of 300 m / min.

Par ailleurs, on a constaté que le signal de mesure d'épaisseur fourni par les capteurs E1, E2 présentait un bruit important et qu'il était souvent difficile de discriminer les variations périodiques d'épaisseur de la bande relatives aux défauts de faux rond des cylindres par rapport aux autres variations d'épaisseur ayant d'autres origines.Furthermore, it was found that the thickness measurement signal supplied by the sensors E1, E2 presented a significant noise and that it was often difficult to discriminate the periodic variations in thickness of the strip relating to the out of round faults of the cylinders compared to other thickness variations from other origins.

Pour évaluer le signal de compensation à appliquer aux moyens de serrage A1, A2 par les compensateurs P1, P2, on analyse le signal de mesure d'épaisseur en fréquence, notamment par transformée de Fourier, on extrait du spectre obtenu les signaux qui correspondent à la fréquence de rotation des cylindres des cages C1, C2 et on génère un signal de compensation à partir de ces signaux extraits.To evaluate the compensation signal to be applied to the clamping means A1, A2 by the compensators P1, P2, the thickness measurement signal is analyzed in frequency, in particular by Fourier transform, the signals which correspond to the frequency of rotation of the cylinders of the cages C1, C2 and a compensation signal is generated from these extracted signals.

Pour produire ainsi un signal de compensation fiable et précis, pour que les signaux extraits de la mesure d'épaisseur représentent bien des défauts de faux rond et non d'autres phénomènes, on est donc conduit à allonger la durée d'intégration de la transformée de Fourier, ce qui améliore la résolution en fréquence de l'analyse du signal de mesure, pour mieux extraire les signaux de faux rond du signal de mesure, et ce qui évite ou limite des détections de défaut aléatoires ou imprécises.To thus produce a reliable and precise compensation signal, so that the signals extracted from the thickness measurement indeed represent run-out faults and not other phenomena, we are therefore led to lengthen the integration time of the transform Fourier, which improves the frequency resolution of the analysis of the measurement signal, to better extract the runout signals from the measurement signal, and which avoids or limits random or imprecise fault detections.

Mais l'allongement de la durée d'intégration augmente encore le retard de la détection du défaut de faux rond par rapport à l'instant de la création du défaut lui-même.However, the lengthening of the integration time further increases the delay in detecting the fault in the run-out compared to the time of creation of the fault itself.

Cette durée d'intégration élevée est nécessaire pour obtenir une régulation stable du fonctionnement du dispositif de compensation de faux-rond.This high integration time is necessary to obtain stable regulation of the operation of the runout compensation device.

Ainsi, entre la création d'un défaut de faux rond sur une cage et la compensation complète dudit défaut, on aboutit à un temps de réponse global de la régulation du dispositif de compensation beaucoup trop long, pendant lequel les défauts d'épaisseur d'une bande en défilement ne sont pas corrigés correctement.Thus, between the creation of a runout defect on a cage and the complete compensation of said defect, the result is an overall response time of the regulation of the compensation device that is far too long, during which the thickness defects of a running tape is not corrected correctly.

Ainsi, à titre d'exemple, les temps de réponse des composantes du dispositif de compensation peuvent être :

  • temps de réponse typique d'un capteur de mesure d'épaisseur : 50 ms.
  • retard dû à la distance cage-capteur : 500 ms.
  • temps de réponse des moyens de serrage : 50 à 70 ms.
Thus, by way of example, the response times of the components of the compensation device can be:
  • typical response time of a thickness measurement sensor: 50 ms.
  • delay due to cage-sensor distance: 500 ms.
  • response time of the clamping means: 50 to 70 ms.

Avec un tel dispositif, la boucle de régulation de compensation de faux-rond présentera un temps de réponse de l'ordre de plusieurs dizaines de secondes.With such a device, the out-of-round compensation regulation loop will have a response time of the order of several tens of seconds.

Si la vitesse de défilement est élevée, et comme la bande passe évidemment à travers plusieurs cages de laminage, en sortie de laminage, les portions de bande le long desquelles les défauts de faux rond persistent représentent une part importante de la bande (jusqu'à la moitié), ce qui ne permet plus d'assurer la garantie commerciale suffisante, par exemple la garantie d'une variation d'épaisseur inférieure à 2,5% ou 3%If the running speed is high, and since the strip obviously passes through several rolling stands, at the end of rolling, the portions of strip along which the runout defects persist represent a significant part of the strip (up to half), which no longer ensures sufficient commercial guarantee, for example the guarantee of a thickness variation of less than 2.5% or 3%

Ainsi, le procédé de compensation du faux rond en temps réel ne présente pas encore les performances requises pour assurer une garantie d'épaisseur suffisamment homogène sur toute une bande laminée, notamment dans le cas de laminage de tôles minces.Thus, the real-time runout compensation method does not yet have the performance required to ensure a sufficiently uniform thickness guarantee over an entire rolled strip, in particular in the case of rolling thin sheets.

Par ailleurs, ce procédé de compensation nécessite une installation coûteuse, liée notamment au nombre de capteurs à implanter.Furthermore, this compensation process requires an expensive installation, linked in particular to the number of sensors to be installed.

L'invention a pour but de fournir un procédé de laminage qui permette de laminer une bande métallique avec une très grande régularité d'épaisseur tout le long de la bande.The object of the invention is to provide a rolling process which makes it possible to laminate a metal strip with very great thickness regularity along the strip.

L'invention a également pour but un dispositif fiable et économique pour la mise en oeuvre de ce procédé.The object of the invention is also to provide a reliable and economical device for implementing this method.

L'invention a pour objet un procédé de laminage à froid d'une bande entre les cylindres de cages de laminage disposées l'une à la suite de l'autre, dans lequel on apporte en temps réel une modification à la consigne de serrage des cylindres d'au moins une desdites cages, pour compenser les défauts de faux-rond des cylindres de ladite cage et dans lequel on évalue ladite modification en analysant en fréquence un signal de mesure d'un paramètre de laminage propre à ladite cage et en extrayant du signal de mesure, les variations périodiques du signal dont les fréquences correspondent aux vitesses de rotation desdits cylindres, de manière à obtenir un signal de compensation proportionnel auxdites variations périodiques, caractérisé en ce que ladite mesure est une mesure de traction de la bande immédiatement en amont de ladite cage.The subject of the invention is a method of cold rolling a strip between the rolls of rolling stands arranged one after the other, in which a modification is made in real time to the tightening set point of the cylinders of at least one of said cages, for compensate for the run-out faults of the cylinders of said cage and in which said modification is evaluated by analyzing in frequency a measurement signal of a rolling parameter specific to said cage and by extracting from the measurement signal, the periodic variations of the signal whose frequencies correspond to the rotational speeds of said cylinders, so as to obtain a compensation signal proportional to said periodic variations, characterized in that said measurement is a measurement of traction of the strip immediately upstream of said cage.

L'invention a encore pour objet une installation de laminage comportant une succession de cages de laminage, des capteurs de mesure de traction intercage, des moyens de serrage pour chaque cage, un dispositif de pilotage, notamment pour réguler lesdits moyens de serrage et au moins un moyen de compensation de défauts de faux-rond des cylindres de laminage d'une cage de la succession de cages relié aux moyens de serrage de ladite cage pour leur délivrer un signal de compensation de défaut de faux-rond, caractérisée en ce que le dispositif de compensation est également relié à un capteur de mesure de traction intercage situé immédiatement en amont de ladite cage (C2, C3) pour recevoir le signal de mesure du capteur de mesure de traction (T2, T3) et évaluer ledit signal de compensation.The subject of the invention is also a rolling installation comprising a succession of rolling stands, interage traction measuring sensors, clamping means for each cage, a control device, in particular for regulating said clamping means and at least means for compensating for runout faults in the rolling rolls of a cage of the succession of cages connected to the clamping means of said cage for delivering a signal for compensating for runout faults, characterized in that the compensation device is also connected to an interage traction measurement sensor located immediately upstream of said cage (C2, C3) to receive the measurement signal from the traction measurement sensor (T2, T3) and evaluate said compensation signal.

L'invention sera mieux comprise à la lecture de la description qui va suivre, donnée à titre d'exemple, et en référence aux figures annexées sur lesquelles :

  • la figure 1 est un schéma partiel d'une installation classique de laminage à froid avec son dispositif de pilotage.
  • la figure 2 représente la même installation de laminage qu'à la figure 1 dotée d'un dispositif de compensation de faux rond des cylindres selon l'art antérieur.
  • la figure 3 représente la même installation de laminage qu'à la figure 1 dotée d'un dispositif de compensation de faux rond des cylindres selon l'invention.
The invention will be better understood on reading the description which follows, given by way of example, and with reference to the appended figures in which:
  • Figure 1 is a partial diagram of a conventional cold rolling installation with its control device.
  • 2 shows the same rolling installation as in Figure 1 with a device for compensating for runout of the cylinders according to the prior art.
  • FIG. 3 represents the same rolling installation as in FIG. 1 provided with a device for compensating for runout of the cylinders according to the invention.

En se reportant à la figure 3, l'installation de laminage comporte trois cages de laminage C1, C2, C3, un dispositif de pilotage S, des capteurs de mesure de traction intercage T2, T3, des moyens de serrage A1, A2, A3 des cages C1, C2, C3 et des dispositifs de compensation P'2, P'3.Referring to FIG. 3, the rolling installation comprises three rolling stands C1, C2, C3, a control device S, interage traction measurement sensors T2, T3, clamping means A1, A2, A3 cages C1, C2, C3 and compensation devices P'2, P'3.

La mesure de la traction inter-cage correspond à la tension de la bande entre chaque cage et les capteurs T2, T3 prévus à cet effet sont par exemple des tensiomètres à déflecteurs.The measurement of the inter-cage traction corresponds to the tension of the strip between each cage and the sensors T2, T3 provided for this purpose are for example tensiometers with deflectors.

Les moyens de serrage A1, A2, A3 sont principalement pilotés par une consigne délivrée par le dispositif de pilotage S.The clamping means A1, A2, A3 are mainly controlled by a setpoint delivered by the control device S.

Les dispositifs de compensation P'2, P'3 ont pour fonction, comme précédemment pour les compensateurs P2, P3, d'évaluer le signal de compensation destiné à corriger en temps réel la consigne de serrage des moyens de serrage A2, A3 des cages C2, C3 en vue d'éliminer le défaut de faux rond des cylindres desdites cages.The compensation devices P'2, P'3 have the function, as previously for the compensators P2, P3, of evaluating the compensation signal intended to correct in real time the tightening instruction of the tightening means A2, A3 of the cages C2, C3 with a view to eliminating the defect in the roundness of the cylinders of said cages.

Pour évaluer le signal de compensation et selon l'invention, les dispositifs de compensation P2 et P3 sont reliés aux capteurs de traction T2 et T3.To evaluate the compensation signal and according to the invention, the compensation devices P2 and P3 are connected to the traction sensors T2 and T3.

D'une manière classique, les cylindres de laminage des cages C2, C3 sont rectifiés mais présentent des défauts d'ovalisation ou de faux rond, qui provoqueraient, en cours de laminage sans compensation, des variations d'entrefer entre les cylindres de travail.Conventionally, the rolling rolls of the cages C2, C3 are rectified but have ovalization or runout defects, which would cause, during rolling without compensation, variations in the air gap between the working rolls.

D'une manière connue en elle-même, on lamine une bande B en régulant le fonctionnement des cages C1, C2, C3 de l'installation à l'aide du dispositif de pilotage S, notamment à partir de la mesure de traction intercage de la bande B par les capteurs T2, T3 et en agissant sur les moyens de serrage successifs de chaque cage A1, A2, A3.In a manner known per se, a strip B is laminated by regulating the operation of the cages C1, C2, C3 of the installation using the control device S, in particular on the basis of the interage traction measurement of the strip B by the sensors T2, T3 and by acting on the successive tightening means of each cage A1, A2, A3.

En outre, en vue de laminer la bande métallique B en maintenant les variations d'épaisseur le long de la bande dans une fourchette largement inférieure aux défauts d'ovalisation des cylindres des cages C2 et C3, on applique à la consigne de serrage des moyens de serrage A2, A3 un signal de compensation du faux rond desdits cylindres.In addition, in order to laminate the metal strip B while maintaining the variations in thickness along the strip in a range much lower than the defects of ovalization of the cylinders of the cages C2 and C3, the means of tightening instruction is applied tightening A2, A3 a signal to compensate for the runout of said cylinders.

Selon l'invention, les compensateurs P'2, P'3 délivrent ledit signal de compensation aux moyens de serrage A2, A3 en évaluant ledit signal à partir du signal de mesure délivré par les capteurs T2, T3 en amont des cages C2, C3.According to the invention, the compensators P'2, P'3 deliver said compensation signal to the clamping means A2, A3 by evaluating said signal from the measurement signal delivered by the sensors T2, T3 upstream of the cages C2, C3 .

L'invention est donc applicable à partir de la deuxième cage de l'installation de laminage et jusqu'à la dernière sans installer de capteurs supplémentaires, puisque des capteurs de mesure de traction T2, T3 sont déjà installés entre chaque cage pour permettre au dispositif S de piloter d'une manière classique l'installation de laminage.The invention is therefore applicable from the second stand of the rolling installation and until the last without installing additional sensors, since traction measurement sensors T2, T3 are already installed between each cage to allow the device S to control the rolling installation in a conventional manner.

Ainsi par exemple, le dispositif de compensation P'2 est adapté d'une manière connue en elle-même pour extraire du signal du capteur T2 les variations périodiques de la traction de la bande B en amont de la cage C2 qui ont une fréquence égale à la vitesse de rotation des cylindres de la cage C2 et pour générer un signal de compensation proportionnel aux dites variations extraites.Thus, for example, the compensation device P'2 is adapted in a manner known per se to extract from the signal from the sensor T2 the periodic variations in the traction of the band B upstream of the cage C2 which have an equal frequency at the speed of rotation of the cylinders of the cage C2 and to generate a compensation signal proportional to said extracted variations.

Selon une variante de l'invention, le dispositif de compensation P'2 prend également en compte les harmoniques des défauts de faux rond, c'est à dire les variations périodiques de la traction de la bande B qui ont une fréquence multiple de la vitesse de rotation des cylindres de la cage C2.According to a variant of the invention, the compensation device P'2 also takes into account the harmonics of the runout faults, that is to say the periodic variations in the traction of the band B which have a frequency multiple of the speed of rotation of the cylinders of the cage C2.

Pour extraire ces variations périodiques, on procède généralement par transformée de Fourier.To extract these periodic variations, one generally proceeds by Fourier transform.

Selon l'invention, on a constaté qu'on pouvait intégrer le signal de mesure de traction sur une durée beaucoup plus courte que dans les procédés de l'art antérieur tout en détectant d'une manière fiable et précise les défauts de faux rond des cylindres de la cage C2.According to the invention, it has been found that the traction measurement signal could be integrated over a much shorter duration than in the methods of the prior art while detecting, in a reliable and precise manner, the out of round faults of the cage cylinders C2.

Alors même par exemple que les deux cylindres de travail de la cage C2 peuvent présenter des vitesses de rotation légèrement différentes, du fait notamment de légères différences de diamètre, il n'est pas nécessaire de choisir un temps d'intégration suffisamment long pour permettre de discriminer le défaut de faux rond de l'un des cylindres par rapport à l'autre et il s'avère suffisant d'évaluer le signal de compensation à partir de l'amplitude moyenne du défaut mesuré.So even for example that the two working cylinders of the cage C2 may have slightly different rotational speeds, in particular due to slight differences in diameter, it is not necessary to choose a sufficiently long integration time to allow discriminate the runout defect of one of the cylinders with respect to the other and it is sufficient to evaluate the compensation signal from the average amplitude of the measured defect.

D'une manière surprenante, on a constaté que le signal de détection des défauts de faux rond présente beaucoup moins de bruits lorsqu'il provient de la mesure de traction d'un capteur T2 en amont de la cage C2 que lorsqu'il provient notamment de la mesure d'épaisseur d'un capteur E2 en aval de la cage C2, comme dans le procédé de l'art antérieur représenté à la figure 2.Surprisingly, it has been found that the signal for detecting runout faults has much less noise when it comes from the measurement of the traction of a sensor T2 upstream of the cage C2 than when it comes in particular measuring the thickness of a sensor E2 downstream of the cage C2, as in the method of the prior art shown in FIG. 2.

Ainsi, pour repérer les défauts de faux rond des cylindres d'une cage en analysant les fréquences du signal de mesure délivré par un capteur de traction en amont de ladite cage, une résolution très fine en fréquence n'est plus nécessaire pour une détection fiable et précise dudit défaut de faux rond, ce qui permet de diminuer sensiblement les temps d'intégration des transformées de Fourier.Thus, to identify runout faults in the cylinders of a cage by analyzing the frequencies of the measurement signal delivered by a traction sensor upstream of said cage, a very fine resolution in frequency is no longer necessary for reliable detection and precise of said runout defect, which makes it possible to significantly reduce the integration times of the Fourier transforms.

Ainsi, selon l'invention, puisque le capteur de défaut de faux rond est un capteur de traction, il n'y a aucun délai entre l'apparition d'un défaut et sa détection, contrairement au procédé de l'art antérieur.Thus, according to the invention, since the runout fault sensor is a traction sensor, there is no delay between the appearance of a fault and its detection, unlike the method of the prior art.

Toujours selon l'invention, les dispositifs de compensation sont programmés pour analyser en fréquence les signaux de mesure avec des temps d'intégration beaucoup plus courts que dans l'art antérieur.Still according to the invention, the compensation devices are programmed to analyze in frequency the measurement signals with much shorter integration times than in the prior art.

Globalement donc, le temps de réponse du dispositif de compensation des faux ronds selon l'invention est considérablement raccourci par rapport aux dispositifs de l'art antérieur.Overall therefore, the response time of the runout compensation device according to the invention is considerably shortened compared to the devices of the prior art.

Ainsi, pour des cylindres tournant à 60 tours par minute, soit 1 Hz, un capteur de mesure de traction présentant un temps de réponse de 16 ms, des moyens de serrage présentant un temps de réponse à l'application d'une consigne de 70 ms, le temps de réponse global de la régulation de compensation du faux rond selon le procédé de l'invention n'est que de 2,5 tours de cylindre environ, soit 2,5 secondes environ.Thus, for cylinders rotating at 60 revolutions per minute, that is 1 Hz, a traction measurement sensor having a response time of 16 ms, clamping means having a response time to the application of a setpoint of 70 ms, the overall response time of the compensation regulation of the runout according to the method of the invention is only about 2.5 revolutions of the cylinder, or about 2.5 seconds.

Le temps de réponse des moyens de serrage et la vitesse maximum de serrage de ces moyens peuvent être des facteurs limitants et critiques pour la mise en oeuvre du procédé selon l'invention ; de préférence, le temps de réponse des moyens de serrage doit rester inférieur à la durée d'une rotation des cylindres.The response time of the clamping means and the maximum clamping speed of these means can be limiting and critical factors for the implementation of the method according to the invention; preferably, the response time of the clamping means must remain less than the duration of a rotation of the cylinders.

Comme la vitesse de bande, et donc de rotation des cylindres croit de l'amont vers l'aval d'une installation de laminage, ces conditions peuvent n'être remplies que pour les premières cages de l'installation et il n'est pas toujours possible d'équiper complètement les installations de laminage avec le dispositif de compensation selon l'invention.As the speed of the strip, and therefore of the rotation of the rolls increases from upstream to downstream of a rolling installation, these conditions may only be fulfilled for the first cages of the installation and it is not it is always possible to fully equip the rolling installations with the compensation device according to the invention.

Le dispositif de compensation et son fonctionnement qui sont décrits pour la cage 2 sont également applicables à la cage 3, ou à d'autres cages éventuelles en aval.The compensation device and its operation which are described for the cage 2 are also applicable to the cage 3, or to other possible cages downstream.

Selon l'invention, et lorsqu'on équipe toutes les cages de laminage d'une installation avec le dispositif selon l'invention, on obtient en sortie de laminage des bandes métalliques présentant des variations longitudinales d'épaisseur inférieures à 5 µm, c'est à dire inférieures à 0,7 % pour une épaisseur moyenne de 0,26 mm.According to the invention, and when all the rolling stands of an installation are fitted with the device according to the invention, metal strips having longitudinal variations in thickness of less than 5 μm are obtained at the rolling exit. ie less than 0.7% for an average thickness of 0.26 mm.

Claims (4)

Procédé de laminage à froid d'une bande (B) entre les cylindres de cages de laminage (C1, C2, C3) disposées l'une à la suite de l'autre, dans lequel on apporte en temps réel une modification à la consigne de serrage des cylindres d'au moins une desdites cages (C1, C2, C3), pour compenser les défauts de faux-rond des cylindres de ladite cage (C2, C3) et dans lequel on évalue ladite modification en analysant en fréquence un signal de mesure d'un paramètre de laminage propre à ladite cage (C2, C3) et en extrayant du signal de mesure, les variations périodiques du signal dont les fréquences correspondent aux vitesses de rotation desdits cylindres, de manière à obtenir un signal de compensation proportionnel auxdites variations périodiques, caractérisé en ce que ladite mesure est une mesure de traction de la bande (B) immédiatement en amont de ladite cage (C2, C3).Method of cold rolling a strip (B) between the rolls of rolling stands (C1, C2, C3) arranged one after the other, in which a modification to the set point is made in real time for tightening the cylinders of at least one of said cages (C1, C2, C3), to compensate for the run-out faults of the cylinders of said cage (C2, C3) and in which said modification is evaluated by analyzing a signal in frequency for measuring a rolling parameter specific to said cage (C2, C3) and by extracting from the measurement signal, the periodic variations of the signal whose frequencies correspond to the rotational speeds of said rolls, so as to obtain a proportional compensation signal to said periodic variations, characterized in that said measurement is a measurement of traction of the strip (B) immediately upstream of said cage (C2, C3). Procédé selon la revendication 1, caractérisé en ce qu'on extrait les variations périodiques du signal de mesure de traction par transformées de Fourier.Method according to claim 1, characterized in that the periodic variations of the traction measurement signal are extracted by Fourier transforms. Installation de laminage comportant une succession de cages de laminage (C1, C2, C3), des capteurs de mesure de traction intercage (T2, T3), des moyens de serrage (A1, A2, A3) pour chaque cage (C1, C2, C3), un dispositif de pilotage (S), notamment pour réguler lesdits moyens de serrage (A1, A2, A3) et au moins un moyen de compensation (P'2, P'3) de défauts de faux-rond des cylindres de laminage d'une cage (C2, C3) de la succession de cages (C1, C2, C3) relié aux moyens de serrage de ladite cage (C2, C3) pour leur délivrer un signal de compensation de défaut de faux-rond, caractérisée en ce que le dispositif de compensation (P'2, P'3) est également relié à un capteur de mesure de traction (T2, T3) intercage situé immédiatement en amont de ladite cage (C2, C3) pour recevoir le signal de mesure du capteur de mesure de traction (T2, T3) et évaluer ledit signal de compensation.Laminating installation comprising a succession of laminating cages (C1, C2, C3), interage traction measurement sensors (T2, T3), clamping means (A1, A2, A3) for each cage (C1, C2, C3), a control device (S), in particular for regulating said clamping means (A1, A2, A3) and at least one compensation means (P'2, P'3) for runout faults in the cylinders of rolling a cage (C2, C3) of the succession of cages (C1, C2, C3) connected to the clamping means of said cage (C2, C3) in order to deliver to them a signal for compensation for a runout defect, characterized in that the compensation device (P'2, P'3) is also connected to a traction measurement sensor (T2, T3) intermingling located immediately upstream of said cage (C2, C3) to receive the measurement signal of the traction measurement sensor (T2, T3) and evaluating said compensation signal. Installation suivant la revendication 3, caractérisée en ce que le capteur de mesure de traction (T2, T3) est un tensiomètre à déflecteur.Installation according to claim 3, characterized in that the traction measurement sensor (T2, T3) is a deflector tensiometer.
EP96401181A 1995-06-08 1996-06-03 Process and equipment for cold-rolling with compensation of the circularity error of the rolls Revoked EP0747143B1 (en)

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FR9506747A FR2735046B1 (en) 1995-06-08 1995-06-08 COLD ROLLING PROCESS WITH OVAL COMPENSATION OF THE ROLLING CYLINDERS.
FR9506747 1995-06-08

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AU2013409182B2 (en) * 2013-12-24 2017-08-31 Arcelormittal Hot rolling method
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ES2966067T3 (en) * 2019-08-16 2024-04-18 Sms Group Gmbh Procedure for the online determination of at least one rolling parameter and rolling mill with a device for the online determination of at least one rolling parameter

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CN1065457C (en) 2001-05-09
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FR2735046A1 (en) 1996-12-13
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ES2135857T3 (en) 1999-11-01
EP0747143B1 (en) 1999-09-15
US5799526A (en) 1998-09-01
CA2178547A1 (en) 1996-12-09
CA2178547C (en) 2004-08-10
DE69604233D1 (en) 1999-10-21
FR2735046B1 (en) 1997-07-11

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