EP1345712A1 - Method for real-time adjustment of a planisher - Google Patents

Method for real-time adjustment of a planisher

Info

Publication number
EP1345712A1
EP1345712A1 EP01272062A EP01272062A EP1345712A1 EP 1345712 A1 EP1345712 A1 EP 1345712A1 EP 01272062 A EP01272062 A EP 01272062A EP 01272062 A EP01272062 A EP 01272062A EP 1345712 A1 EP1345712 A1 EP 1345712A1
Authority
EP
European Patent Office
Prior art keywords
plate
leveling
leveler
strip
measurement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP01272062A
Other languages
German (de)
French (fr)
Other versions
EP1345712B1 (en
Inventor
Jacques-Yves Bourgon
Olivier Guillard
Fabrice Tondo
Olivier Madelaine-Dupuich
Pierre Lemoine
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
USINOR SA
Original Assignee
USINOR SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by USINOR SA filed Critical USINOR SA
Publication of EP1345712A1 publication Critical patent/EP1345712A1/en
Application granted granted Critical
Publication of EP1345712B1 publication Critical patent/EP1345712B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
    • B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers

Definitions

  • the present invention relates to a method for regulating in real time a leveler intended for planing metal strips in coil or in coil, such as steel strips or directly plates or sheets.
  • the invention applies on the one hand to the leveling of the metal strips intended to be cut at the exit from the leveler, so as to obtain plates or sheets of a determined length L, and on the other hand to the leveling of the plates or leaves.
  • a metal strip or a plate undergoes various operations, such as hot rolling and cold rolling, intended to give it uniform dimensional characteristics over its entire length; thus a laminated metal strip theoretically has a constant thickness and width at all points.
  • the rolling operation is not sufficient to obtain a strip free from defects. Indeed, the latter may have flatness defects such as undulations at the edges or in the center, and a hanger (that is to say a curvature) depending on the length or the width of the strip.
  • leveler consists of two superimposed cassettes each supporting several motorized rollers, offset from one another, and arranged alternately above and below the path of the strip.
  • a reel of metal strip In the case of a reel of metal strip, it is unwound beforehand, generally straightened in a straightener before undergoing the leveling operation.
  • the planed strips In order to deliver products that meet the flatness criteria demanded by manufacturers, the planed strips are not rewound, in fact the winding destroys the flatness. They are therefore cut, at the exit from the leveler, so as to obtain plates, sheets or blanks, either by means of a guillotine shears, or by means of a follower, rotary or flying shears.
  • the plates or planed sheets are then transported to a stacker, and are stacked while awaiting delivery.
  • the leveling proper is carried out by passing the strip or the plate between the offset rollers of the leveler, the clamping of which is adjusted at the inlet, that is to say the spacing of the rollers upstream from the leveler, and at the outlet, that is to say the spacing of the rollers downstream of the leveler.
  • the residual stresses of the strip are homogenized, and thus flatness defects such as undulations and bending according to width are remedied.
  • the bending is processed according to the length of the strip. For the sake of clarity in the rest of the text, when we signify "hanger according to length”, we will simply mention "hanger”.
  • the setting of the clamping parameters at the entry and exit of the leveler is carried out during each change of coil, plate (or sheet), in order to adapt these parameters not only to the dimensional characteristics and to the types of defects of the strip. or plate, but also depending on the hanger, depending on the shape you want to print on the plate (or sheet) after planing.
  • the plates will be delivered with a zero hanger (perfectly flat plate), a hanger positive or a negative hanger.
  • the clamping of the rollers of the entry leveler is first adjusted according to methods known per se, then the clamping of the rollers at the outlet is adjusted.
  • One known means for adjusting the rollers of the leveler at the outlet consists in checking the residual bend of the plate (or of the sheet) after leveling.
  • the plate is lifted by means of a lifter so that the plate is suspended by one or two support points, then an operator measures the hanger of the plate by raising the arrow in the center of the plate using a ruler.
  • the operator can then adjust the tightening setting of the exit rollers to correct the plate hanger and adapt it to the request of the manufacturer. This measurement operation is repeated as many times as necessary during each change of product (in the form of a coil, plate or sheet).
  • the plate lifting operation may involve risks for the operator's safety, in particular for large plates
  • the subject of the invention is therefore a method for regulating in real time a leveler intended for leveling metal strips, plates, or sheets, characterized in that:
  • the measurement of the residual hanger of the planed plate is carried out from a measurement of the curvature of said plate at the outlet of the leveler outside said support zone, said measurement being carried out by means of at least three sensors of distance.
  • the invention also relates to a leveling installation of the type comprising a leveler for leveling metal strips, plates or sheets, characterized in that it comprises means for cutting, after leveling, the strip into planed plates or planed sheets, means for measuring the residual hanger of the planed plates or planed sheets resulting either from the planing of the cut strip, or from the planing of the plate or sheet, at the outlet of the planer, and means for modifying the tightening of the rollers located at the outlet of said leveler according to the indications provided by the measuring means of said residual hanger.
  • the means for measuring the residual hanger comprise at least three distance sensors such as optical distance sensors, or eddy current distance sensors.
  • the leveling installation includes automatic means for adjusting the tightening of the output rollers according to the indications of the distance measurements from the sensors.
  • the measurement of the curvature of the planed plate is carried out at the level of said planed plate outside of a support zone.
  • the invention consists in carrying out a measurement in real time of the hanger of the plate or of the strip cut into a plate at its exit from the leveler, and in controlling the tightening of the rollers according to the results of this measured.
  • FIG. 1 is a schematic cross-sectional view of a leveler
  • - Figure 2 shows the variation in the value of the residual hanger as a function of the tightening of the rollers at the leveler exit.
  • a planer 1 is shown diagrammatically, of two superposed cassettes 2,3 supporting motorized rollers 4, positioned offset from one another, and between which a metal strip 5, a plate or a leaf.
  • the installation comprises cutting means 6 arranged at the outlet of the leveler, a transport table 7, a means of conveying the strip cut into plates (not shown in the figure).
  • the installation comprises cutting means 6 arranged at the leveler exit.
  • the cutting means 6 are superfluous when plates or sheets are planed directly; however, they can be present in the installation and in this case they are not operated.
  • the strip or the metal plate 5 is planed in the leveler 1 by scrolling between the rollers 4.
  • the strip 5 is sheared by the cutting means 6 consisting of either a guillotine shear or a rotary, follower, or flying shear, so as to obtain plates 8, sheets or blanks of a length L determined in advance.
  • the cutting means 6 consisting of either a guillotine shear or a rotary, follower, or flying shear, so as to obtain plates 8, sheets or blanks of a length L determined in advance.
  • a part of the planed plate 8 rests on the transport table 7, while a length of plate L 'determined in advance by a detection cell 10 protrudes from the table 7 and is therefore outside the area of support.
  • the measurements made by the sensors 9 are preferably non-contact distance measurements in order to avoid distorting the measurements of the curvature of the plate part 8 of length L '.
  • Contactless distance sensors 9 will therefore be used such as eddy current sensors or optical sensors ...
  • the hanger of the plate 8 required by the manufacturer can be zero (perfectly flat plate), positive (curvature of the plate up) or negative
  • This operation can also be carried out automatically by a computer.
  • the actuator 12 acts directly on the tightening of the rollers 4a and 4b at the leveler exit 1, that is to say on their relative spacing.
  • the method according to the invention thus makes it possible to control in real time the hanger of each of the plates 8.
  • the real time control of the hanger of the plate 8 allows '' act immediately on the clamping parameters at the exit from the leveler 1 and modify, if necessary, the settings for the clamping at the outlet (rollers 4a and 4b), so as to obtain plates 8 whose hanger is constant, or whose value of the hanger remains within the tolerance limit set by the manufacturer.
  • the method according to the invention eliminates the operations of lifting the plate and measuring the hanger by an operator, and has the following other advantages over the prior art:
  • the device according to the invention is compatible with compact lines, it requires a smaller space than that required by lifting the plate. - systematic control of the hanger of all plates (archiving of values)
  • FIG. 2 shows the variation in the value of the residual hanger (expressed in mm / m) as a function of the tightening of the rollers at the exit from the leveler (expressed in mm).
  • the material considered is a steel strip 6 mm thick, 1500 mm wide and with an elastic limit of 350 Mpa.
  • the initial plasticization rate of the strip is 60%.
  • the maximum plasticization rate targeted for this example is 80%. This imposed plasticization rate depends on the leveling strategy used and on the initial flatness of the strip before leveling. The amplitude of the hanger variations after leveling is directly correlated to this parameter.
  • Example 1 the non-contact distance sensors measure a residual bend of the plate obtained after planing and shearing of the steel strip of + 7mm / m.
  • the regulation system (a) must correct the tightening of the rollers at the exit of the leveler by a correction of 0.15 mm so that the tightening reaches 0.32 mm.
  • Example 2 the contactless distance sensors measure a residual bend of the plate obtained after planing and shearing of the steel strip of -7mm / m.
  • the regulation system (a ') must correct the tightening of the rollers at the exit of the leveler by a correction of 0.2 mm so that the tightening reaches 0.32 mm.

Abstract

A method for real-time adjustment of a planisher for planishing metal strip. After a planished strip has been cut into a plate, the method includes measuring the plate at the output of the planisher outside a support zone, correcting the measurement so as to eliminate the influence due to self-weight of the plate, and correcting, as the case may be, the clamping of rollers located at the planer output so as to obtain a plate with a controlled curve.

Description

Procédé de régulation en temps réel d'une planeuse. Method of real-time regulation of a leveler.
La présente invention est relative à un procédé pour réguler en temps réel une planeuse destinée à planer des bandes métalliques en bobine ou en coil, telles que des bandes d'acier ou directement des plaques ou des feuilles.The present invention relates to a method for regulating in real time a leveler intended for planing metal strips in coil or in coil, such as steel strips or directly plates or sheets.
L'invention s'applique d'une part au planage des bandes métalliques destinées à être découpées en sortie de planeuse, de manière à obtenir des plaques ou des feuilles d'une longueur déterminée L, et d'autre part au planage des plaques ou des feuilles. Une bande métallique ou une plaque subit diverses opérations, telles que le laminage à chaud et le laminage à froid, destinées à lui conférer des caractéristiques dimensionnelles homogènes sur toute sa longueur ; ainsi une bande métallique laminée possède théoriquement en tout point une épaisseur et une largeur constante. Cependant l'opération de laminage ne suffit pas pour obtenir une bande exempte de défaut. En effet, celle-ci peut présenter des défauts de planéité tels que des ondulations au niveau des rives ou du centre, et un cintre (c'est à dire une courbure) selon la longueur ou la largeur de la bande.The invention applies on the one hand to the leveling of the metal strips intended to be cut at the exit from the leveler, so as to obtain plates or sheets of a determined length L, and on the other hand to the leveling of the plates or leaves. A metal strip or a plate undergoes various operations, such as hot rolling and cold rolling, intended to give it uniform dimensional characteristics over its entire length; thus a laminated metal strip theoretically has a constant thickness and width at all points. However, the rolling operation is not sufficient to obtain a strip free from defects. Indeed, the latter may have flatness defects such as undulations at the edges or in the center, and a hanger (that is to say a curvature) depending on the length or the width of the strip.
Ces défauts de planéité sont corrigés par planage de la bande dans une planeuse. Une telle planeuse est constituée de deux cassettes superposées supportant chacune plusieurs rouleaux motorisés, décalés les uns par rapport aux autres, et disposés en alternance au-dessus et en dessous du parcours de la bande. Dans le cas d'une bobine de bande métallique, celle-ci est préalablement débobinée, en général redressée dans une redresseuse avant de subir l'opération de planage. Afin de livrer des produits répondant aux critères de planéité exigés par les industriels, les bandes planées ne sont pas re-bobinées, en effet le bobinage détruit la planéité. Elles sont donc découpées, en sortie de la planeuse, de manière à obtenir des plaques, des feuilles ou des flans, soit au moyen d'une cisaille guillotine, soit au moyen d'une cisaille suiveuse, rotative ou volante. Les plaques ou les feuilles planées ensuite transportées vers une empileuse, et sont empilées en attendant leur livraison. Le planage proprement dit est réalisé par passage de la bande ou de la plaque entre les rouleaux décalés de la planeuse, dont on règle le serrage en entrée, c'est à dire l'écartement des rouleaux amont de la planeuse, et en sortie, c'est à dire l'écartement des rouleaux aval de la planeuse. En entrée de la planeuse on homogénéise les contraintes résiduelles de la bande, et on remédie ainsi aux défauts de planéité tels que les ondulations et le cintrage selon la largeur. En sortie de la planeuse, on traite le cintrage selon la longueur de la bande. Pour plus de clarté dans la suite du texte, lorsqu'on signifiera "cintre selon la longueur", on se contentera de mentionner "cintre". Le réglage des paramètres de serrage en entrée et en sortie de la planeuse est effectué lors de chaque changement de bobine, de plaque (ou de feuille), afin d'adapter ces paramètres non seulement aux caractéristiques dimensionnelles et aux types de défauts de la bande ou de la plaque, mais aussi en fonction du cintre, selon la forme qu'on souhaite imprimer à la plaque (ou à la feuille) après planage.These flatness defects are corrected by leveling the strip in a leveler. Such a leveler consists of two superimposed cassettes each supporting several motorized rollers, offset from one another, and arranged alternately above and below the path of the strip. In the case of a reel of metal strip, it is unwound beforehand, generally straightened in a straightener before undergoing the leveling operation. In order to deliver products that meet the flatness criteria demanded by manufacturers, the planed strips are not rewound, in fact the winding destroys the flatness. They are therefore cut, at the exit from the leveler, so as to obtain plates, sheets or blanks, either by means of a guillotine shears, or by means of a follower, rotary or flying shears. The plates or planed sheets are then transported to a stacker, and are stacked while awaiting delivery. The leveling proper is carried out by passing the strip or the plate between the offset rollers of the leveler, the clamping of which is adjusted at the inlet, that is to say the spacing of the rollers upstream from the leveler, and at the outlet, that is to say the spacing of the rollers downstream of the leveler. At the entry of the leveler, the residual stresses of the strip are homogenized, and thus flatness defects such as undulations and bending according to width are remedied. At the exit from the leveler, the bending is processed according to the length of the strip. For the sake of clarity in the rest of the text, when we signify "hanger according to length", we will simply mention "hanger". The setting of the clamping parameters at the entry and exit of the leveler is carried out during each change of coil, plate (or sheet), in order to adapt these parameters not only to the dimensional characteristics and to the types of defects of the strip. or plate, but also depending on the hanger, depending on the shape you want to print on the plate (or sheet) after planing.
En effet, selon l'application à laquelle les industriels destinent ces plaques (ou feuilles) planées, ou encore en fonction du type d'installation que possèdent ces industriels, les plaques seront livrées avec un cintre nul (plaque parfaitement plane), un cintre positif ou un cintre négatif. On effectue d'abord le réglage du serrage des rouleaux de la planeuse en entrée selon des méthodes connues en elles-mêmes, puis on règle le serrage des rouleaux en sortie.In fact, depending on the application to which the manufacturers intend these planed plates (or sheets), or depending on the type of installation that these manufacturers have, the plates will be delivered with a zero hanger (perfectly flat plate), a hanger positive or a negative hanger. The clamping of the rollers of the entry leveler is first adjusted according to methods known per se, then the clamping of the rollers at the outlet is adjusted.
Un moyen connu pour régler les rouleaux de la planeuse en sortie consiste à contrôler le cintre résiduel de la plaque (ou de la feuille) après planage. A cet effet, on lève la plaque au moyen d'un releveur de manière à ce que la plaque soit suspendue par un ou deux points d'appui, puis un opérateur mesure le cintre de la plaque en relevant la flèche au centre de la plaque à l'aide d'une règle. L'opérateur peut ensuite ajuster le réglage du serrage des rouleaux en sortie pour corriger le cintre de la plaque et l'adapter à la demande de l'industriel. Cette opération de mesure est renouvelée autant de fois que nécessaire lors de chaque changement de produit (sous la forme de bobine, de plaque ou de feuille).One known means for adjusting the rollers of the leveler at the outlet consists in checking the residual bend of the plate (or of the sheet) after leveling. For this purpose, the plate is lifted by means of a lifter so that the plate is suspended by one or two support points, then an operator measures the hanger of the plate by raising the arrow in the center of the plate using a ruler. The operator can then adjust the tightening setting of the exit rollers to correct the plate hanger and adapt it to the request of the manufacturer. This measurement operation is repeated as many times as necessary during each change of product (in the form of a coil, plate or sheet).
Cette technique présente divers inconvénients suivants : - la mesure du cintre d'une plaque lors du changement de produit et l'adaptation du serrage des rouleaux en sortie par l'opérateur imposent de stopper la ligne de planage pendant cette opération, d'où une perte de productivité ; - certaines lignes de planage sont compactes, et il n'est pas toujours possible d'y implanter un dispositif de levage des plaques ; dans ce cas la mesure du cintre de la plaque est effectuée hors ligne avec un temps d'arrêt de la ligne plus important encore ;This technique has the following drawbacks: - the measurement of the hanger of a plate when changing the product and the adaptation of the clamping of the rollers at the outlet by the operator means that the leveling line must be stopped during this operation, resulting in a loss of productivity; - some leveling lines are compact, and it is not always possible to install a plate lifting device there; in this case, the measurement of the plate hanger is carried out offline with an even longer line downtime;
- l'opération de levage de la plaque peut comporter des risques pour la sécurité de l'opérateur, notamment pour les plaques de grandes dimensions- the plate lifting operation may involve risks for the operator's safety, in particular for large plates
(supérieures à 2 m de long).(greater than 2 m long).
En outre, si les caractéristiques dimensionnelles d'une bande d'une bobine donnée sont constantes sur toute sa longueur, il n'en est pas de même en ce qui concerne les caractéristiques mécaniques. Or les variations des caractéristiques mécaniques d'une bande ont un impact négatif sur la maîtrise du cintre final des plaques après planage de la bande. En effet le serrage des rouleaux en sortie de planeuse ayant été réglé pour une caractéristique mécanique donnée de la bande, ce serrage, au cours du planage, ne sera plus adapté si les caractéristiques mécaniques de la bande varient de façon importante.In addition, if the dimensional characteristics of a strip of a given coil are constant over its entire length, it is not the same with regard to the mechanical characteristics. However, the variations in the mechanical characteristics of a strip have a negative impact on the control of the final hanger of the plates after leveling of the strip. In fact, the tightening of the rollers at the exit from the leveler having been adjusted for a given mechanical characteristic of the strip, this tightening, during leveling, will no longer be suitable if the mechanical characteristics of the strip vary significantly.
Or la maîtrise du cintre résiduel de la plaque est une opération importante dans la mesure où les tolérances exigées par les industriels, concernant les dimensions et le cintre de la plaque, sont de plus en plus étroites. A titre indicatif, actuellement, les tolérances concernant le cintre des plaques destinées à la découpe LASER, et pour certaines applications automobile telles que les pièces de liaison, sont souvent inférieures à ± 3 mm/m. La présente invention a pour but de remédier aux inconvénients de la méthode utilisée dans l'art antérieur.However, controlling the residual hanger of the plate is an important operation insofar as the tolerances required by manufacturers, concerning the dimensions and the hanger of the plate, are becoming increasingly narrow. As an indication, currently, the tolerances concerning the hanger of the plates intended for LASER cutting, and for certain automotive applications such as connecting parts, are often less than ± 3 mm / m. The object of the present invention is to remedy the drawbacks of the method used in the prior art.
L'invention a donc pour objet un procédé pour réguler en temps réel une planeuse destinée à planer des bandes métalliques, des plaques, ou des feuilles, caractérisé en ce que :The subject of the invention is therefore a method for regulating in real time a leveler intended for leveling metal strips, plates, or sheets, characterized in that:
- après avoir plané ladite bande, on la découpe pour obtenir, une plaque, ou une feuille ; - on mesure la courbure de ladite plaque issue soit du planage de la bande découpée, soit du planage de la plaque, en sortie de ladite planeuse hors d'une zone d'appui ;- After planing said strip, it is cut to obtain a plate or a sheet; - Measuring the curvature of said plate from either the leveling of the cut strip, or from the leveling of the plate, at the outlet of said leveler outside of a support zone;
- on corrige ladite mesure de manière à éliminer l'influence due au poids propre de la plaque; et- Correcting said measurement so as to eliminate the influence due to the self-weight of the plate; and
- on corrige, le cas échéant, le serrage des rouleaux situés en sortie de ladite planeuse de manière à obtenir une plaque de cintre contrôlé.- Correcting, if necessary, the tightening of the rollers located at the outlet of said leveler so as to obtain a controlled hanger plate.
Selon d'autres caractéristiques préférées de l'invention :According to other preferred characteristics of the invention:
- la mesure du cintre résiduel de la plaque planée est réalisée à partir d'une mesure de la courbure de ladite plaque en sortie de la planeuse hors de ladite zone d'appui, ladite mesure étant effectuée au moyen d'au moins trois capteurs de distance.the measurement of the residual hanger of the planed plate is carried out from a measurement of the curvature of said plate at the outlet of the leveler outside said support zone, said measurement being carried out by means of at least three sensors of distance.
- la mesure du cintre résiduel de la plaque planée est déduite de la courbure mesurée et de la courbure propre de la plaque planée. L'invention a également pour objet une installation de planage du type comprenant une planeuse pour planer des bandes métalliques, des plaques ou des feuilles, caractérisé en ce qu'elle comporte des moyens pour découper, après planage, la bande en plaques planées ou en feuilles planées, des moyens de mesure du cintre résiduel des plaques planées ou feuilles planées issues soit du planage de la bande découpée, soit du planage de la plaque ou de la feuille, en sortie de la planeuse, et des moyens pour modifier le serrage des rouleaux situés en sortie de ladite planeuse en fonction des indications fournies par les moyens de mesure dudit cintre résiduel. Selon d'autres caractéristiques de l'invention : - les moyens de mesure du cintre résiduel comportent au moins trois capteurs de distance tels que des capteurs de distance optiques, ou des capteurs de distance à courant de Foucault.- the measurement of the residual bend of the planed plate is deduced from the measured curvature and from the proper curvature of the planed plate. The invention also relates to a leveling installation of the type comprising a leveler for leveling metal strips, plates or sheets, characterized in that it comprises means for cutting, after leveling, the strip into planed plates or planed sheets, means for measuring the residual hanger of the planed plates or planed sheets resulting either from the planing of the cut strip, or from the planing of the plate or sheet, at the outlet of the planer, and means for modifying the tightening of the rollers located at the outlet of said leveler according to the indications provided by the measuring means of said residual hanger. According to other characteristics of the invention: - the means for measuring the residual hanger comprise at least three distance sensors such as optical distance sensors, or eddy current distance sensors.
- l'installation de planage comprend des moyens automatiques pour régler le serrage des rouleaux de sortie en fonction des indications des mesures de distances des capteurs.- the leveling installation includes automatic means for adjusting the tightening of the output rollers according to the indications of the distance measurements from the sensors.
- la mesure de la courbure de la plaque planée est réalisée au niveau de ladite plaque planée hors d'une zone d'appui. Comme on l'aura compris, l'invention consiste à exécuter une mesure en temps réel du cintre de la plaque ou de la bande découpée en plaque à sa sortie de la planeuse, et à commander le serrage des rouleaux en fonction des résultats de cette mesure. Les caractéristiques et avantages de l'invention apparaîtront à la lecture de la description qui va suivre, donnée à titre d'exemple et faite en référence aux dessins annexés sur lesquels :the measurement of the curvature of the planed plate is carried out at the level of said planed plate outside of a support zone. As will be understood, the invention consists in carrying out a measurement in real time of the hanger of the plate or of the strip cut into a plate at its exit from the leveler, and in controlling the tightening of the rollers according to the results of this measured. The characteristics and advantages of the invention will appear on reading the description which follows, given by way of example and made with reference to the appended drawings in which:
- la figure 1 est une vue schématique en coupe transversale d'une planeuse ; - la figure 2 montre la variation de la valeur du cintre résiduel en fonction du serrage des rouleaux en sortie de planeuse.- Figure 1 is a schematic cross-sectional view of a leveler; - Figure 2 shows the variation in the value of the residual hanger as a function of the tightening of the rollers at the leveler exit.
Sur la figure 1 , on a représenté schématiquement une planeuse 1 , de deux cassettes 2,3 superposées supportant des rouleaux 4 motorisés, positionnés de manière décalée les uns par rapport aux autres, et entre lesquels défile une bande métallique 5, une plaque ou une feuille. L'installation comprend des moyens de découpe 6 disposés en sortie de planeuse, une table de transport 7, un moyen de convoyage de la bande découpée en plaques (non représenté sur la figure). Dans le cas du planage de bandes, l'installation comprend des moyens de découpe 6 disposés en sortie de planeuse Bien entendu, les moyens de découpe 6 sont superflus lorsque qu'on plane directement des plaques ou des feuilles ; cependant, ils peuvent être présents dans l'installation et dans ce cas on ne les fait pas fonctionner. En 8, on a représenté la plaque ou la feuille (soit issue du cisaillage de la bande après planage, soit issue de la plaque ou de la feuille planée) dont une partie est en appui sur la table 7 et l'autre partie dépasse hors de la table 7. Des capteurs de distance placés, sur notre schéma, en dessous de la zone de la plaque planée 8 non supportée par la table 7, sont reliés à un système de régulation 1 1 du serrage des rouleaux 4a et 4b situés en sortie de la planeuse, lui-même relié à un actionneur 12 de commande du serrage en sortie (rouleaux 4a et 4b).In FIG. 1, a planer 1 is shown diagrammatically, of two superposed cassettes 2,3 supporting motorized rollers 4, positioned offset from one another, and between which a metal strip 5, a plate or a leaf. The installation comprises cutting means 6 arranged at the outlet of the leveler, a transport table 7, a means of conveying the strip cut into plates (not shown in the figure). In the case of strip planing, the installation comprises cutting means 6 arranged at the leveler exit. Of course, the cutting means 6 are superfluous when plates or sheets are planed directly; however, they can be present in the installation and in this case they are not operated. In 8, there is shown the plate or the sheet (either from the shearing of the strip after planing, or from the plate or the planed sheet) of which a part is supported on the table 7 and the other part protrudes out of the table 7. Distance sensors placed, in our diagram, below the area of the flat plate 8 not supported by the table 7, are connected to a regulation system 1 1 of the tightening of the rollers 4a and 4b located in exit from the leveler, itself connected to an actuator 12 for controlling the clamping at exit (rollers 4a and 4b).
La bande ou la plaque métallique 5 est planée dans la planeuse 1 par défilement entre les rouleaux 4. En sortie de planeuse, la bande 5 est cisaillée par les moyens de découpe 6 constitués soit d'une cisaille guillotine, soit d'une cisaille rotative, suiveuse, ou volante, de manière à obtenir des plaques 8, des feuilles ou des flans d'une longueur L déterminée à l'avance. Une partie de la plaque planée 8 repose sur la table de transport 7, tandis qu'une longueur de plaque L' déterminée à l'avance par une cellule de détection 10 dépasse de la table 7 et se trouve donc hors de la zone d'appui.The strip or the metal plate 5 is planed in the leveler 1 by scrolling between the rollers 4. At the exit from the leveler, the strip 5 is sheared by the cutting means 6 consisting of either a guillotine shear or a rotary, follower, or flying shear, so as to obtain plates 8, sheets or blanks of a length L determined in advance. A part of the planed plate 8 rests on the transport table 7, while a length of plate L 'determined in advance by a detection cell 10 protrudes from the table 7 and is therefore outside the area of support.
Au moins trois capteurs 9, disposés sur un socle de référence (non représenté sur la figure) positionné soit au-dessus, soit en dessous de la zone correspondant à la longueur L' de la plaque 8, mesurent la distance qui les sépare de ladite partie de plaque 8 de longueur L' de manière à en déterminer la courbure C. Les mesures réalisées par les capteurs 9 sont de préférence des mesures de distance sans contact afin d'éviter de fausser les mesures de la courbure de la partie de plaque 8 de longueur L'. On utilisera donc des capteurs de distance 9 sans contact tels que des capteurs à courant de Foucault ou des capteurs optiques... Afin de déterminer le cintre résiduel Cr de la plaque 8 à partir de la courbure C mesurée, il convient de tenir compte de la courbure Cp de la plaque 8 due à son poids propre. La connaissance des paramètres suivants :At least three sensors 9, arranged on a reference base (not shown in the figure) positioned either above or below the zone corresponding to the length L ′ of the plate 8, measure the distance which separates them from said plate part 8 of length L ′ so as to determine the curvature C. The measurements made by the sensors 9 are preferably non-contact distance measurements in order to avoid distorting the measurements of the curvature of the plate part 8 of length L '. Contactless distance sensors 9 will therefore be used such as eddy current sensors or optical sensors ... In order to determine the residual arch C r of the plate 8 from the curvature C measured, account should be taken of of the curvature C p of the plate 8 due to its self-weight. Knowledge of the following parameters:
- longueur L' de la plaque 8 qui dépasse hors de la table 7, déterminée par une cellule de position 10, - épaisseur de la plaque 8,- length L ′ of the plate 8 which protrudes outside the table 7, determined by a position cell 10, - thickness of the plate 8,
- distance des capteurs 9 par rapport à la table 7, permettent de calculer la courbure Cp de la plaque 8 due à son poids propre. Ainsi en retranchant la valeur de la courbure Cp à la valeur de la courbure C mesurée on obtient aisément le cintre résiduel Cr de la plaque 8. Connaissant le cintre résiduel Cr de la plaque 8, on calcule la fonction de transfert qui permet ensuite d'ajuster le serrage en sortie (rouleaux 4a et 4b) de la planeuse 1 , de manière à adapter le cintre de la plaque suivante 8 à la demande de l'industriel.- distance of the sensors 9 relative to the table 7, make it possible to calculate the curvature C p of the plate 8 due to its self-weight. Thus by subtracting the value of the curvature C p from the value of the curvature C measured, we easily obtain the residual arch C r of the plate 8. Knowing the residual arch C r of the plate 8, we calculate the transfer function which allows then adjust the clamping at the outlet (rollers 4a and 4b) of the leveler 1, so as to adapt the hanger of the following plate 8 at the request of the manufacturer.
Le cintre de la plaque 8 exigé par l'industriel peut être nul (plaque parfaitement plane), positif (courbure de la plaque vers le haut) ou négatifThe hanger of the plate 8 required by the manufacturer can be zero (perfectly flat plate), positive (curvature of the plate up) or negative
(courbure de la plaque vers le bas). Pour obtenir des plaques possédant un de ces profils, il convient soit de desserrer, soit de resserrer l'écartement des rouleaux 4a par rapport aux rouleaux 4b situés en sortie de planeuse 1. Cette opération peut être effectuée par un opérateur qui recueille les différentes mesures évoquées précédemment, calcule à l'aide de ces mesures la fonction de transfert permettant de déduire les paramètres de serrage en sortie des rouleaux 4a et 4b à injecter dans le système de régulation 11 selon le cintre qu'on souhaite appliquer à la plaque.(curvature of the plate down). To obtain plates having one of these profiles, it is necessary either to loosen or to tighten the spacing of the rollers 4a relative to the rollers 4b situated at the outlet of the leveler 1. This operation can be carried out by an operator who collects the various measurements mentioned above, calculates with the aid of these measurements the transfer function making it possible to deduce the tightening parameters at the output of the rollers 4a and 4b to be injected into the regulation system 11 depending on the hanger you want to apply to the plate.
Cette opération peut également être effectuée automatiquement par un calculateur.This operation can also be carried out automatically by a computer.
Dès que les paramètres de serrage des rouleaux 4a et 4b sont déterminés, l'actionneur 12 agit directement sur le serrage des rouleaux 4a et 4b en sortie de planeuse 1 , c'est à dire sur leur écartement relatif.As soon as the tightening parameters of the rollers 4a and 4b are determined, the actuator 12 acts directly on the tightening of the rollers 4a and 4b at the leveler exit 1, that is to say on their relative spacing.
Le procédé selon l'invention permet ainsi de contrôler en temps réel le cintre de chacune des plaques 8. Ainsi, lorsque les caractéristiques mécaniques de la plaque 8 d'une bobine varient, le contrôle en temps réel du cintre de la plaque 8 permet d'agir aussitôt sur les paramètres de serrage en sortie de planeuse 1 et de modifier, le cas échéant, les réglages du serrage en sortie (rouleaux 4a et 4b), de manière à obtenir des plaques 8 dont le cintre est constant, ou dont la valeur du cintre reste dans la limite de la tolérance fixée par l'industriel.The method according to the invention thus makes it possible to control in real time the hanger of each of the plates 8. Thus, when the mechanical characteristics of the plate 8 of a coil vary, the real time control of the hanger of the plate 8 allows '' act immediately on the clamping parameters at the exit from the leveler 1 and modify, if necessary, the settings for the clamping at the outlet (rollers 4a and 4b), so as to obtain plates 8 whose hanger is constant, or whose value of the hanger remains within the tolerance limit set by the manufacturer.
Outre l'avantage mentionné précédemment, le procédé selon l'invention supprime les opérations de levage de la plaque et de mesure du cintre par un opérateur, et présente par rapport à l'art antérieur les autres avantages suivants :In addition to the advantage mentioned above, the method according to the invention eliminates the operations of lifting the plate and measuring the hanger by an operator, and has the following other advantages over the prior art:
- amélioration des conditions de sécurité ;- improvement of security conditions;
- suppression du temps de manutention des plaques permettant ainsi d'augmenter la productivité globale de la ligne ;- elimination of plate handling time, thereby increasing the overall productivity of the line;
- rapidité d'exécution des corrections du serrage des rouleaux, dans le cas où l'on utilise un calculateur automatique,- speed of execution of the roller tightening corrections, in the case where an automatic computer is used,
- opération de contrôle du cintre de la plaque facile à mettre en œuvre, on n'est pas limité aux plaques de longueur inférieure à 3 m pour des épaisseurs de 3 mm comme c'était le cas avec le procédé de l'art antérieur ;- control operation of the hanger of the plate easy to implement, it is not limited to plates of length less than 3 m for thicknesses of 3 mm as was the case with the method of the prior art;
- gain de place : le dispositif selon l'invention est compatible avec les lignes compactes, il nécessite un espace plus réduit que celui nécessité par le levage de la plaque. - contrôle systématique du cintre de toutes les plaques (archivage des valeurs)- space saving: the device according to the invention is compatible with compact lines, it requires a smaller space than that required by lifting the plate. - systematic control of the hanger of all plates (archiving of values)
La figure 2 montre la variation de la valeur du cintre résiduel (exprimé en mm/m) en fonction du serrage des rouleaux en sortie de planeuse (exprimé en mm).FIG. 2 shows the variation in the value of the residual hanger (expressed in mm / m) as a function of the tightening of the rollers at the exit from the leveler (expressed in mm).
Le matériau considéré est une bande d'acier de 6 mm d'épaisseur, de 1500 mm de large et de limite élastique de 350 Mpa. Le taux de plastification initial de la bande est de 60%. Le taux de plastification maximal visé pour cet exemple est de 80%. Ce taux de plastification imposé dépend de la stratégie de planage utilisée et de la planéité initiale de la bande avant planage. L'amplitude des variations de cintre après planage est directement corrélée à ce paramètre.The material considered is a steel strip 6 mm thick, 1500 mm wide and with an elastic limit of 350 Mpa. The initial plasticization rate of the strip is 60%. The maximum plasticization rate targeted for this example is 80%. This imposed plasticization rate depends on the leveling strategy used and on the initial flatness of the strip before leveling. The amplitude of the hanger variations after leveling is directly correlated to this parameter.
Les exemples suivants ont pour but d'illustrer l'utilisation du procédé. Dans l'exemple 1 , les capteurs de distance sans contact mesurent un cintre résiduel de la plaque obtenu après planage et cisaillage de la bande d'acier de +7mm/m. Pour que le cintre de cette plaque soit nul (plaque parfaitement plane), il faut que le système de régulation (a) corrige le serrage des rouleaux en sortie de planeuse par une correction de 0,15 mm de manière à ce que le serrage atteigne 0,32 mm.The following examples are intended to illustrate the use of the process. In Example 1, the non-contact distance sensors measure a residual bend of the plate obtained after planing and shearing of the steel strip of + 7mm / m. For the hanger of this plate to be zero (perfectly flat plate), the regulation system (a) must correct the tightening of the rollers at the exit of the leveler by a correction of 0.15 mm so that the tightening reaches 0.32 mm.
Dans l'exemple 2, les capteurs de distance sans contact mesurent un cintre résiduel de la plaque obtenue après planage et cisaillage de la bande d'acier de -7mm/m. Pour que le cintre de cette plaque soit nul (plaque parfaitement plane), il faut que le système de régulation (a') corrige le serrage des rouleaux en sortie de planeuse par une correction de 0,2 mm de manière à ce que le serrage atteigne 0,32 mm. In Example 2, the contactless distance sensors measure a residual bend of the plate obtained after planing and shearing of the steel strip of -7mm / m. For the hanger of this plate to be zero (perfectly flat plate), the regulation system (a ') must correct the tightening of the rollers at the exit of the leveler by a correction of 0.2 mm so that the tightening reaches 0.32 mm.

Claims

REVENDICATIONS
1- Procédé pour réguler en temps réel une planeuse destinée à planer des bandes métalliques, des plaques ou des feuilles, caractérisé en ce que : - après avoir plané ladite bande (5), on la découpe pour obtenir, une plaque planée (8), ou une feuille planée ;1- Method for regulating in real time a planer intended to plan metal strips, plates or sheets, characterized in that: - after having planed said strip (5), it is cut to obtain a planed plate (8) , or a planar leaf;
- on mesure la courbure de ladite plaque planée (8) issue soit du planage de la bande (5) découpée, soit du planage de la plaque (5), en sortie de ladite planeuse (1) hors d'une zone d'appui ; - on corrige ladite mesure de manière à éliminer l'influence due au poids propre de la plaque planée (8) ; et- the curvature of said leveled plate (8) is measured, resulting either from the leveling of the cut strip (5), or from the leveling of the plate (5), at the outlet of said leveler (1) outside a support zone ; - said measurement is corrected so as to eliminate the influence due to the own weight of the planed plate (8); And
- on corrige, le cas échéant, le serrage des rouleaux (4a) et (4b) situés en sortie de ladite planeuse (1 ) de manière à obtenir une plaque planée (8) de cintre contrôlé.- we correct, if necessary, the tightening of the rollers (4a) and (4b) located at the outlet of said leveler (1) so as to obtain a leveled plate (8) of controlled bend.
2- Procédé selon la revendication 1 , caractérisé en ce que la mesure du cintre résiduel de la plaque planée (8) est réalisée à partir d'une mesure de la courbure de ladite plaque planée (8) en sortie de la planeuse (1 ) hors de ladite zone d'appui, ladite mesure étant effectuée au moyen d'au moins trois capteurs de distance (9).2- Method according to claim 1, characterized in that the measurement of the residual bend of the leveled plate (8) is carried out from a measurement of the curvature of said leveled plate (8) at the outlet of the leveler (1) outside said support zone, said measurement being carried out by means of at least three distance sensors (9).
3- Procédé selon les revendications 1 à 2, caractérisé en ce que la mesure du cintre résiduel de la plaque planée (8) est déduite de la courbure mesurée et de la courbure propre de la plaque planée (8).3- Method according to claims 1 to 2, characterized in that the measurement of the residual bend of the planed plate (8) is deduced from the measured curvature and the natural curvature of the planed plate (8).
4- Installation de planage du type comprenant une planeuse pour planer des bandes métalliques, des plaques, ou des feuilles, caractérisé en ce qu'elle comporte des moyens pour découper, après planage, la bande (5) en plaques planées (8) ou en feuilles planées, des moyens de mesure du cintre résiduel des plaques planées (8) ou feuilles planées issues soit du planage de la bande4- Leveling installation of the type comprising a leveler for leveling metal strips, plates, or sheets, characterized in that it comprises means for cutting, after leveling, the strip (5) into leveled plates (8) or in flattened sheets, means for measuring the residual bend of the flattened plates (8) or flattened sheets resulting either from the flattening of the strip
(5) découpée, soit du planage de la plaque (5) ou de la feuille, en sortie de la planeuse (1), et des moyens pour modifier le serrage des rouleaux (4a) et (4b) situés en sortie de ladite planeuse (1 ) en fonction des indications fournies par les moyens de mesure dudit cintre résiduel.(5) cut, either from the leveling of the plate (5) or the sheet, at the outlet of the leveler (1), and means for modifying the tightening of the rollers (4a) and (4b) located at the outlet of said leveler (1) according to the indications provided by the measuring means of said residual hanger.
5- Installation de planage selon la revendication 4, caractérisé en ce que lesdits moyens de mesure du cintre résiduel comportent au moins trois capteurs de distance (9).5- Leveling installation according to claim 4, characterized in that said means for measuring the residual bend comprise at least three distance sensors (9).
6- Installation de planage selon la revendication 4 à 5, caractérisé en ce que lesdits moyens de mesure du cintre résiduel comportent au moins trois capteurs de distance optiques (9).6- Leveling installation according to claim 4 to 5, characterized in that said means for measuring the residual bend comprise at least three optical distance sensors (9).
7- Installation de planage selon la revendication 4 à 5, caractérisé en ce que lesdits moyens de mesure du cintre résiduel comportent au moins trois capteurs de distance à courant de Foucault (9).7- Leveling installation according to claim 4 to 5, characterized in that said means for measuring the residual bend comprise at least three eddy current distance sensors (9).
8- Installation de planage selon les revendications 4 à 7, caractérisé en ce qu'elle comprend des moyens automatiques pour régler le serrage des rouleaux de sortie (4a) et (4b) en fonction des indications des mesures de distances des capteurs (9).8- Leveling installation according to claims 4 to 7, characterized in that it comprises automatic means for adjusting the tightening of the output rollers (4a) and (4b) according to the indications of the distance measurements of the sensors (9) .
9- Installation de planage selon les revendications 4 à 8, caractérisé en ce que la mesure de la courbure de la plaque planée (8) est réalisée au niveau de ladite plaque planée (8) hors d'une zone d'appui. 9- Leveling installation according to claims 4 to 8, characterized in that the measurement of the curvature of the leveled plate (8) is carried out at the level of said leveled plate (8) outside a support zone.
EP01272062A 2000-12-27 2001-12-14 Method for real-time adjustment of a planisher Expired - Lifetime EP1345712B1 (en)

Applications Claiming Priority (3)

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FR0017085 2000-12-27
FR0017085A FR2818563B1 (en) 2000-12-27 2000-12-27 METHOD FOR REAL-TIME REGULATION OF A PLANER
PCT/FR2001/003992 WO2002051563A1 (en) 2000-12-27 2001-12-14 Method for real-time adjustment of a planisher

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YU47003A (en) 2004-11-25
EP1345712B1 (en) 2004-09-01
US7032420B2 (en) 2006-04-25
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WO2002051563A1 (en) 2002-07-04
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CA2432648A1 (en) 2002-07-04
ME00794B (en) 2012-03-20
CA2432648C (en) 2009-11-17
FR2818563B1 (en) 2003-02-07
DE60105312T2 (en) 2005-09-01
PL201321B1 (en) 2009-03-31
FR2818563A1 (en) 2002-06-28
TR200402368T4 (en) 2004-12-21
CZ20031785A3 (en) 2004-02-18
ATE275007T1 (en) 2004-09-15
PL361846A1 (en) 2004-10-04
US20040069035A1 (en) 2004-04-15
PT1345712E (en) 2005-01-31
DE60105312D1 (en) 2004-10-07

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