EP1673181A1 - Method of increasing the control precision of the path of a product in a levelling machine with interlocking rollers, and levelling installation used to implement same - Google Patents

Method of increasing the control precision of the path of a product in a levelling machine with interlocking rollers, and levelling installation used to implement same

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Publication number
EP1673181A1
EP1673181A1 EP04787476A EP04787476A EP1673181A1 EP 1673181 A1 EP1673181 A1 EP 1673181A1 EP 04787476 A EP04787476 A EP 04787476A EP 04787476 A EP04787476 A EP 04787476A EP 1673181 A1 EP1673181 A1 EP 1673181A1
Authority
EP
European Patent Office
Prior art keywords
leveling
rollers
machine
spacing
value
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
EP04787476A
Other languages
German (de)
French (fr)
Other versions
EP1673181B1 (en
Inventor
Andrzej Farnik
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.)
Clecim SAS
Original Assignee
VAI Clecim SA
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Filing date
Publication date
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Application filed by VAI Clecim SA filed Critical VAI Clecim SA
Publication of EP1673181A1 publication Critical patent/EP1673181A1/en
Application granted granted Critical
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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 subject of the invention is a method for increasing the precision of the control of the trajectory of the product in a planing machine with nested rollers and the leveling installation allowing the implementation of the process.
  • a multi-roller leveler is often used comprising two leveling units each carrying a series of rollers with parallel axes and placed, respectively, above and below the strip, the rollers being offset longitudinally and vertically so as to overlap by determining an undulating path of the strip which is thus subjected to traction-bending effects in alternating directions.
  • the operation of such a machine has been the subject of advanced theoretical approaches.
  • the entry zone which includes the first three or four rolls, is a significant plasticization zone in which visual flatness defects such as long edges or long center, "quarter of the band" defects and any distribution are eliminated. heterogeneous cross section of longitudinal constraints.
  • the exit zone which includes the last three or four rolls, has the function of reducing the gradients of the normal and transverse stresses in the thickness to assure the sheet a virtually zero residual hanger and tile.
  • a leveling installation therefore generally comprises a fixed support cage, two leveling units with parallel rollers, placed respectively above and below the strip and the rollers of which are nested so as to determine a path. corrugated strip and means for adjusting and maintaining the spacing of said crews by pressing on the fixed cage for adjusting the nesting of the rollers, each leveling crew comprising a row of parallel active rollers supported on a chassis of support by means of at least one row of support rollers and mounted to rotate, at their ends, each on two bearings defining an axis of rotation perpendicular to the direction of travel, said bearings being carried, respectively, by two side parts integral with the support frame. Most often the lower leveling crew is fixed in position, the upper crew being able to move vertically for adjusting the nesting.
  • the input and output actuators can be adjusted differently, which makes it possible to determine a tilting generally necessary for the realization of the two leveling effects established by the theory and exposed above.
  • the actuators can also be adjusted differently from one side relative to the other by introducing a lateral tilting so as to correctly distribute the leveling effect over the width of the product to be leveled.
  • the forces developed for leveling are very high, in particular when this operation is carried out on a heavy sheet after hot rolling and accelerated cooling, or else on a cold sheet.
  • the deformation under stress of the different parts of the machine (also called yielding) distorts the precision of the control of the position of the leveling rollers, therefore the exact value of the curvature obtained on each roller.
  • the overall yielding of the machine modifies the targeted plasticization rate, therefore there is a risk in the entry area of not completely eliminating the flatness defects, it also modifies the rate of decrease in plasticization, therefore the transition with the exit area and may not eliminate residual stresses as expected.
  • the leveling module of a leveler even of robust design is of the order of 100 t / mm per column, or the leveling effort for a sheet of 3 meters in width can be from 1000 tonnes to 2500 tonnes which leads to a yield (without compensation) of 2.5 mm to 5 mm.
  • the precision requested is not very high in the entry area of the machine and could accommodate a simple yield compensation, there would however be the risk of having refusal of engagement of the product in a machine set too tight as a precaution.
  • the invention therefore aims to increase the precision of the control of these machines and a machine equipped with a new control device and making it possible to solve all of these problems without causing any complication or excessive cost of the devices used.
  • the compensation for yielding is replaced by a real-time model for presetting the position of the leveling rollers associated with a direct measurement of the spacing of the active rollers.
  • a theoretical presetting model is installed which gives at least one reference value for the presetting of nestings and at least one value of the spacing of the leveling rollers is directly measured, which is compared to the reference values and the leveling rollers are adjusted to maintain the measured values equal to the reference values so as to maintain the trajectory of the product to be leveled inside the machine in accordance with l ripple provided by the model to achieve leveling.
  • two measurements are made of the value of the spacing of the leveling rollers, a first at the inlet of the machine and, respectively, a second at the outlet of the machine, which are compared each of these measurements with the reference value given by the model for the same rollers, respectively at the inlet and at the outlet of the machine and one acts on the members for adjusting the position of the leveling rollers at the inlet and respectively at the outlet of the machine for keep the measured value equal to the value of the reference so as to achieve the decrease in the rate of plasticization predicted by the model to achieve leveling.
  • a measurement is made of the value of the spacing of each of the leveling rollers which is compared to each reference value given by the model and action is taken on the individual adjustment members of the position of each of the leveling rollers to maintain the measured value equal to the value of the reference so as to achieve the undulation and the decrease in the rate of plasticization predicted by the model for achieving leveling.
  • position control requires ensuring that at uniform positions of the leveling rollers, given by position sensors, identical leveling forces correspond.
  • a kind of calibration must first be carried out so as not to depend on the mounting mode of the sensors in the machine and the position of their 'zero' reference.
  • a calibration is carried out, called equalization of the active rollers on a flat machined sheet of known thickness by differentially modifying the position of the active rollers by lateral tilting from one side to the other. so as to obtain equal leveling forces on both sides of the machine measured by the measuring devices.
  • the leveling is carried out on a moving sheet by differentially modifying the position of the active rollers by a lateral tilting from one side to the other and which is carried out. equalization of the averages of the forces recorded by the measuring devices on each side during said scrolling.
  • a device allowing direct measurement of the value of the spacing of the leveling rollers at at least one point so as to know the exact value of the nesting by direct measurement.
  • the installation also includes, and still according to the invention, an electronic device making it possible to control the measured spacing of the leveling rollers to the theoretical value given by the model by acting on the devices for adjusting the nesting.
  • the nesting adjustment devices are hydraulically operated.
  • the installation is provided with a device allowing the direct measurement of the value of the spacing of the leveling rollers at at least two points, one located in the machine entry area and the other located in the exit area.
  • the electronic device makes it possible to control the measured spacing of the leveling rollers situated in the entry zone of the machine and respectively in the exit zone at the theoretical value given by the model for the spacing of the situated rollers. in the entry zone of the machine and respectively in the exit zone by acting independently on the devices for adjusting the nesting of the rollers of each of the entry and exit zones respectively.
  • These devices are preferably hydraulically operated.
  • independent devices allow the direct measurement of the value of the spacing of each pair of active leveling rollers separately.
  • the leveling installation with parallel rollers comprises a means for individually adjusting the position of each leveling roller and an electronic device making it possible to control the measured spacing of each of the leveling rollers to the theoretical value given by the model for the 'spacing of each of these rollers by acting independently on their nesting adjustment device.
  • the leveling installation advantageously comprises a device for adjusting the nesting of each roller with hydraulic control.
  • the electronic devices making it possible to control the measured spacing of the leveling rollers to the theoretical value given by the model include a differential adjustment device making it possible to adjust a lateral tilting of the rollers d 'one side with respect to the other and with respect to the set value, to allow the device to be tared by a leveling process on a flat machined sheet of known thickness.
  • a differential adjustment device making it possible to adjust a lateral tilting of the rollers d 'one side with respect to the other and with respect to the set value, to allow the device to be tared by a leveling process on a flat machined sheet of known thickness.
  • Figure 1 there is shown the mechanical part of the assembly of an installation according to the invention comprising, in general, a support cage 1, an upper leveling equipment 2 and a lower leveling equipment 2 ' multi-roll.
  • the fixed support cage 1 comprises a lower bed base 11, two lateral uprights placed on either side of a longitudinal median plane P of travel of the strip 10 to be leveled and an upper bed base 14.
  • Each lateral upright consists of a pair of spaced apart columns 12, 12 ', 13 (in the figures, only three columns are visible).
  • These columns and the upper base generally forming a rigid slab, are equipped with various devices known in themselves and widely described in the prior art which can cooperate to allow vertical sliding of the base 14 along the four columns 12, 12 ' , 13.
  • each cylinder consists of a body 31 fixed to the base 14 and a piston 32 secured to the column.
  • the lower base 11 being fixed, the upper base 14 can therefore move, under the action of the four jacks 3, the pistons of the jacks remaining at the same level.
  • the jacks 3 are positioned to adjust the desirable nesting of the rollers relative to the thickness of the sheet to be planed so as to achieve the corrugation determined by the theoretical model. They exert the leveling force during the passage of the product.
  • Each leveling device 2, 2 ′ comprises a row of active rollers 4, 4 ′ associated with a row of support rollers 5, 5 ′, the whole being carried by a chassis.
  • Each active roller 4, 4 ' is rotatably mounted on two bearings defining its axis of rotation, it is supported on a support roller 5, 5' rotatably mounted on two end bearings.
  • the end bearings 51 of the upper leveling equipment 2 are supported on the upper base by means of a support member 52.
  • this support member may include an adjustment device which makes it possible to individually modify for each active roller its nesting, the overall value of which is given by the positioning of the bed base of the upper leveling crew 2 using the jacks 3
  • These adjustment devices can be mechanical, such as for example a wedge system, or can be constituted by a row of hydraulic cylinders as in patent FR 2 732 913. In this case it will be possible, in addition to the individual adjustment of the nesting, to obtain by the differential adjustment of the cylinders of the same row, a cambering effect of the active cylinders so as to better distribute the leveling effect over the width of the band to hover.
  • the at least one sensor 6 making it possible to continuously measure the absolute value of the spacing of the active cylinders 4, 4 ′, independently of the deformation of the columns and of the whole of the machine, installed for example between the upper 2 and lower 2 ′ leveling crews.
  • two sensors 6 and 6 ′ are shown, one at the inlet of the machine and the other in the outlet area so as to be able to more precisely control the variation in the plasticization rate as well as this has been described in the general description of the problem.
  • the sensors can be of any type, and for example of the LVDT type
  • FIG. 2 represents all of the associated mechanical and electrical devices to constitute a leveling machine according to the invention.
  • the mechanical part of the machine is shown schematically in a cross section.
  • the sensor (s) 6 are mounted on one side of the machine, the hydraulic cylinders 3 are fitted with sensors 35 allowing the measurement of the overall leveling forces.
  • These jacks are supplied by a conventional pump and accumulator device 8 via two servo valves or two groups of servo valves 71, 72 supplying each side of the machine.
  • These servo valves are controlled by at least one electronic control circuit, which is broken down into two electronic circuits, each controlling a servo valve or a group of servo valves.
  • a closed loop is produced of the measured value of the spacing of the active rollers 4, 4 ′ on the reference position introduced into the electronic circuit for controlling the servo valves.
  • These electronic circuits (91, 92) which can be analog or else digital computers comprise summing circuits and conventional circuits of proportional, integral and differential control called 'PID'.
  • the reference values corresponding to the desirable nesting of the active rollers are developed by a leveling model 110 implemented in a process computer 100, they are introduced into the electronic circuits for controlling the servo valves. (91, 92) via a summing / differentiating stage 93, 94 which makes it possible to introduce a command for tilting the machine from one side relative to the other.
  • the force sensors 35 are connected to the computer 100 in which a tilting instruction will be developed, this is added to the nesting reference in circuit 94 to be sent as a control signal for one side of the machine, it is differentiated from the same signal in circuit 93 to be sent as a control signal to the other side of the machine.
  • the computer 100 is connected to operator interface devices such as screen and control console 101, printer and recorder 102 so as to be able to control the operation of the machine and manage its production.
  • operator interface devices such as screen and control console 101, printer and recorder 102
  • printer and recorder 102 so as to be able to control the operation of the machine and manage its production.
  • the same type of circuit will be used.
  • the jacks 3 located on the inlet side and those on the outlet side are supplied separately by servo valves and all the electronic circuits 9 described above are doubled for independent control of each zone; of course it is the same computer 100 which prepares all the references and distributes them over all of the electronic control circuits.
  • the support members 52 of each upper support roller 5 are adjustment members and make it possible to control each upper active roller 4 individually, a separate and individual embodiment is carried out. measurement of the spacing between each of the upper and lower active rollers and a control device similar to that described is installed for each pair of active cylinders.
  • a control device (9) of the type described above is produced for each pair of active cylinders.
  • the computer 100 is used to draw up all the instructions and to distribute them on all the electronic control circuits 9. In this case the main jacks 3 are no longer used for these functions and are used to regulate the general opening and closing of the machine depending on the thickness of the sheet to hover.
  • the exact undulation desired is obtained by adjusting the individual nesting of each roller 4 by means of the adjustment devices 52.
  • the spacing of the active rollers 4,4 ' is measured, compared to the reference setpoint developed using the leveling model and the necessary correction is introduced so as to cancel the error resulting from the deformations of the machine under the leveling force by acting on the means for adjusting the nesting .
  • the absolute measurement of the deviation of the active cylinders is obtained using the sensors 6, this value is compared with the reference in circuits 91 and 92 and the resulting signal is used to control the servo valve 7 which makes it possible to move the jacks 3 controlling the movement of the leveling equipment.
  • the reference is obtained by combining the dimension developed by the leveling model 110 and the tilting instruction.
  • the two quantities are added in circuit 94 to be applied on one side of the machine, they are subtracted in circuit 93 to be applied on the other side of the machine, so as to achieve a balanced tilting and distributed by side by compared to the value of the theoretical nesting necessary to obtain the undulation defined by the model.
  • an absolute measurement is made of the distance between the active cylinders 4, 4 ′ in the entry zone of the machine, and another in the exit zone.
  • the nesting references developed by the leveling model 110 are added to a tilting instruction to control one side of the machine, and subtracted to control the other side; so as to carry out a balanced tilting and distributed by side compared to the value of the theoretical nesting necessary to obtain the undulation defined by the model.
  • the means for individual adjustment of the nesting of the active cylinders 52 are constituted by a row of hydraulic cylinders, it will be advantageous to superimpose the adjustment of the nesting of the row of cylinders, an individual differential adjustment of each cylinder making it possible to achieve a cambering effect on the active roller so as to obtain a better distribution of the leveling effect over the width of the product to be leveled.
  • the tilting instructions are established during a leveling phase on a flat machined product of known thickness serving as gauge. This product or size is introduced into the machine and a slight nesting is ordered to cause the active rollers to be clamped on the product or size.
  • the leveling forces induced on each side of the machine are then measured, for example using the force sensors 35 installed on the jacks 3 when one is in the presence of a machine of the type described in FIG. 2.
  • a tilting is then controlled so as to balance the forces on one side and the other of the machine, if they are not at the start, by tightening the side of the machine which generates the smallest effort, and we note the value of the tilting which makes it possible to obtain equal efforts on each side.
  • This entire sequence is managed by the computer 100 which makes it possible to store the values of the forces and those of the tiltings produced.
  • This leveling process is, according to the invention, used with all of the embodiments of the process described, that is to say that it can be implemented by the two groups of jacks 3 (one group for each side of the machine) in the case where there is only one sensor for measuring the spacing of the active rollers, but it can also be implemented by performing a simultaneous but independent equalization of the cylinders 3 of the area entry and those of the exit zone in the case where there is a measurement in each of these zones.
  • each upper active roller 4 is a device consisting of a row of hydraulic cylinders, as well as an absolute gauge measurement for each pair of active rollers.
  • the procedure is the same and consists in ordering a tilting of each pair of active rollers until the efforts applied at their end are equal, and using this tilting value as a setpoint for all subsequent operation. of the machine.
  • the leveling is carried out on a moving strip.
  • Such a model calculates the behavior of the product to be leveled and the leveler from the geometric and mechanical characteristics of the sheet to be leveled and the leveler (for example: thickness and width of the sheet, elastic limit at the leveling temperature of the metal of which it is made, possibly amplitude and nature of the defects; number of planer rollers, distance between rollers of the same equipment, diameter of the rollers). It allows, by methods that a person skilled in the art will know how to determine, an optimal adjustment of the leveler, and thus to determine tightening instructions in particular at the entry and exit of the leveler.
  • the adjustment instructions can be supplemented by balancing instructions between the two sides of the leveler, determined by the leveling operation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
  • Press Drives And Press Lines (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Machine Tool Units (AREA)
  • Road Paving Machines (AREA)

Abstract

The invention relates to a method of increasing the control precision of the path of a product in a levelling machine comprising: a fixed support cage (1); two levelling assemblies with parallel rollers, which are placed above (2) and below (2') the strip respectively; the devices necessary in order to adjust the interlocking of the rollers (3, 52); means (35) for measuring the levelling forces at least of two sides of the machine; and a theoretical pre-setting model (110). The inventive method consists in: directly measuring at least one value for the spacing of the levelling rollers, which is compared to reference values; and using the members for adjusting the position of the levelling rollers (3, 52) in order to maintain the measured values equal to the reference values. The invention is particularly suitable for machines used to level flat metal products.

Description

Procédé d'augmentation de la précision du contrôle de la trajectoire du produit dans une machine à planer à rouleaux imbriqués et installation de planage permettant la mise en œuvre du procédé. Method for increasing the precision of the control of the trajectory of the product in a planing machine with nested rollers and installation for leveling allowing the implementation of the process.
L'invention a pour objet un procédé d'augmentation de la précision du contrôle de la trajectoire du produit dans une machine à planer à rouleaux imbriqués et l'installation de planage permettant la mise en œuvre du procédé. Pour le planage des produits plats et, en particulier, des bandes métalliques laminées, on utilise souvent une planeuse à multi-rouleaux comprenant deux équipages de planage portant chacun une série de rouleaux à axes parallèles et placés, respectivement, au dessus et en dessous de la bande, les rouleaux étant décalés longitudinalement et verticalement de façon à s'imbriquer en déterminant un trajet ondulé de la bande qui est ainsi soumise à des effets de traction-flexion dans des sens alternés. Le fonctionnement d'une telle machine a fait l'objet d'approches théoriques avancées. Ces théories du planage s'appuient sur le calcul des courbures maximales de la tôle dans la planeuse, ces courbures engendrent une plastification de la matière dans l'épaisseur du produit qui conditionne le détensionnement des contraintes dans la largeur et l'épaisseur. Toute planeuse peut être décomposée en deux zones dont les fonctions sont très différentes mais complémentaires et interactives. La zone d'entrée, qui comprend les trois ou quatre premiers rouleaux est une zone de plastification importante dans laquelle on élimine les défauts visuels de planéité tels que les bords longs ou le centre long, les défauts « quart de bande » ainsi que toute répartition transversale hétérogène des contraintes longitudinales. La zone de sortie, qui comprend les trois ou quatre derniers rouleaux, a pour fonction de réduire les gradients des contraintes normales et transversales dans l'épaisseur pour assurer à la tôle un cintre et une tuile résiduels quasi nuls. On sait établir des calculs théoriques performants permettant d'obtenir un résultat théorique précis et pouvant servir au préréglage des machines. Le principe est basé sur la décroissance progressive du taux de plastification. Ceci ne peut être obtenu qu'avec des machines comportant un nombre suffisant de rouleaux planeurs et permettant un réglage adéquat de l'imbrication de chacun de ces rouleaux. Si la précision demandée pour les premiers rouleaux est relativement faible, car on recherche un taux de plastification élevé, celle nécessaire au réglage des rouleaux de la zone de sortie est élevée, et ceci d'autant plus que les épaisseurs des tôles à planer sont plus fines. Il est donc souhaitable d'avoir des machines dont les rouleaux ont tous un réglage indépendant, qui soit d'une précision suffisante, fiable et répétitive. Une installation de planage comprend donc, d'une façon générale, une cage de soutien fixe, deux équipages de planage à rouleaux parallèles, placés respectivement au-dessus et en dessous de la bande et dont les rouleaux sont imbriqués de façon à déterminer un trajet ondulé de la bande et des moyens de réglage et de maintien de l'écartement desdits équipages par appui sur la cage fixe pour le réglage de l'imbrication des rouleaux, chaque équipage de planage comportant une rangée de rouleaux actifs parallèles prenant appui sur un châssis de support par l'intermédiaire d'au moins une rangée de rouleaux d'appui et montés rotatifs, à leurs extrémités, chacun sur deux paliers définissant un axe de rotation perpendiculaire à la direction de défilement, lesdits paliers étant portés, respectivement, par deux pièces latérales solidaires du châssis de support. Le plus souvent l'équipage de planage inférieur est fixe en position, l'équipage supérieur pouvant se déplacer verticalement pour le réglage de l'imbrication. A cet effet, on utilise généralement quatre actionneurs mécaniques ou hydrauliques montés aux angles du châssis et permettant de régler le niveau général de l'équipage réglable par rapport à l'équipage inférieur fixe et, par conséquent, l'imbrication des rouleaux. En outre, les actionneurs en entrée et en sortie peuvent être réglés différemment, ce qui permet de déterminer un basculement en général nécessaire à la réalisation des deux effets de planage établis par la théorie et exposés plus haut. Les actionneurs peuvent aussi être réglés différemment d'un côté relativement à l'autre en introduisant un basculement latéral de manière à répartir correctement l'effet de planage sur la largeur du produit à planer. Les efforts développés pour le planage sont très élevés, en particulier lorsque cette opération est réalisée sur une tôle forte après laminage à chaud et refroidissement accéléré, ou bien sur une tôle froide. On est donc amené à donner aux planeuses une structure aussi rigide que possible de façon à pouvoir contrôler les effets du planage. La déformation sous effort des différentes parties de la machine (encore appelée cédage) fausse la précision du contrôle de la position des rouleaux de planage, donc la valeur exacte de la courbure obtenue sur chaque rouleau. Le cédage global de la machine modifie le taux de plastification visé, donc risque en zone d'entée de ne pas éliminer complètement les défauts de planéité, il modifie aussi le taux de décroissance de la plastification, donc la transition avec la zone de sortie et risque de ne pas éliminer les contraintes résiduelles comme prévu. De plus il peut se produire un cédage transversal, d'un côté sur l'autre, qui va modifier le taux de plastification en zone d'entrée et son homogénéité dans la largeur du produit, il peut même créer des défauts de planéité. Pour palier à ces inconvénients on a réalisé des planeuses a contrôle hydraulique pour le déplacement de l'équipage de planage mobile, et aussi pour le contrôle individuel de chaque rouleau de planage, et on a associé un modèle de cédage basé sur les mesures d'effort et un calcul théorique des déformations de la machine sous effort, pour compenser ces déformations, comme dans le brevet de la requérante FR 2 732 913. Mais toutes ces compensations sont entachées d'erreurs dues aux non linéarités du cédage de la machine et qui ont pour origine les frottements que l'on trouve entre les parties fixes et les parties mobiles de la machine. De plus le module de cédage d'une planeuse, même de conception robuste est de l'ordre de 100 t/mm par colonne, or l'effort de planage pour une tôle de 3 mètres de largeur peut être de 1000 tonnes à 2500 tonnes ce qui conduit à un cédage (sans compensation) de 2,5 mm à 5 mm. La précision demandée n'est pas très élevée dans la zone d'entrée de la machine et pourrait s'accommoder d'une simple compensation de cédage, il y aurait cependant le risque d'avoir des refus d'engagement du produit dans une machine réglée trop serrée par précaution. Par contre la précision nécessaire sur les courbures pour l'élimination des contraintes résiduelles dans la zone de sortie exige une précision du contrôle de la position des rouleaux de quelques dixièmes de millimètres. Le contrôle de la zone de transition implique finalement d'avoir un contrôle précis sur pratiquement tous les rouleaux, d'autant plus que pour certaines applications on va faire varier le pas des rouleaux maintenus rigidement en position de manière à augmenter la capacité de la planeuse, comme il est dit dans le brevet FR 2 732 913. Cela aura pour effet de déplacer la zone d'entrée et la zone de sortie et va donc contribuer aussi à une recherche d'une plus grande précision de contrôle de la position de tous les rouleaux de la planeuse. L'invention a donc pour but d'augmenter la précision du contrôle de ces machines et une machine équipée d'un nouveau dispositif de contrôle et permettant de résoudre l'ensemble de ces problèmes sans entraîner de complication ni de coût excessif des dispositifs utilisés. La compensation des cédages est remplacée par un modèle en temps réel de préréglage de la position des rouleaux de planage associé à une mesure directe de l'écartement des rouleaux actifs. Dans un procédé selon l'invention, on installe un modèle théorique de préréglage qui donne au moins une valeur de référence pour le préréglage des imbrications et on mesure directement au moins une valeur de l'écartement des rouleaux de planage, que l'on compare aux valeurs de référence et on agit sur les organes de réglage de la position des rouleaux de planage pour maintenir les valeurs mesurées égales aux valeurs de la référence de manière à maintenir la trajectoire du produit à planer à l'intérieur de la machine conformément à l'ondulation prévue par le modèle pour réaliser le planage. En particulier on réalise deux mesures de la valeur de l'écartement des rouleaux de planage, une première à l'entrée de la machine et, respectivement, une seconde à la sortie de la machine, que l'on compare chacune de ces mesures à la valeur de référence donnée par le modèle pour les mêmes rouleaux, respectivement à l'entrée et à la sortie de la machine et on agit sur les organes de réglage de la position des rouleaux de planage en entrée et respectivement en sortie de la machine pour maintenir la valeur mesurée égale à la valeur de la référence de manière à réaliser la décroissance du taux de plastification prévue par le modèle pour réaliser le planage. Dans le procédé complet selon l'invention on réalise une mesure de la valeur de l'écartement de chacun des rouleaux de planage que l'on compare à chaque valeur de référence donnée par le modèle et on agit sur les organes de réglage individuels de la position de chacun des rouleaux de planage pour maintenir la valeur mesurée égale à la valeur de la référence de manière à réaliser l'ondulation et la décroissance du taux de plastification prévues par le modèle pour réaliser le planage. Mais le contrôle de position nécessite de s'assurer qu'à des positions uniformes des rouleaux de planage, données par des capteurs de position, correspondent des efforts de planage identiques. Il faut au préalable réaliser une sorte d'étalonnage de manière à ne pas dépendre du mode de montage des capteurs dans la machine et de la position de leur référence 'zéro'. Dans un procédé selon l'invention on procède à un étalonnage, appelé équinivelage des rouleaux actifs sur une tôle usinée plane d'épaisseur connue en modifiant de façon différentielle la position des rouleaux actifs par un basculement latéral d'un côté sur l'autre de manière à obtenir l'égalité des efforts de planage des deux côtés de la machine mesurés par les dispositifs de mesure. Dans un procédé plus élaboré de l'invention on réalise l'équinivelage sur une tôle en défilement en modifiant de façon différentielle la position des rouleaux actifs par un basculement latéral d'un côté sur l'autre et que l'on procède à l'égalisation des moyennes des efforts enregistrés par les dispositifs de mesure de chaque côté pendant ledit défilement. Dans une installation de planage à rouleaux parallèles selon l'invention on dispose d'un dispositif permettant la mesure directe de la valeur de l'écartement des rouleaux de planage en au moins un point de façon à connaître la valeur exacte de l'imbrication par une mesure directe. L'installation comporte aussi, et toujours selon l'invention, un dispositif électronique permettant d'asservir l'écartement mesuré des rouleaux de planage à la valeur théorique donnée par le modèle en agissant sur les dispositifs de réglage de l'imbrication. Dans une version améliorée de l'invention les dispositifs de réglage de l'imbrication sont à commande hydraulique. Dans une autre disposition d'une installation de planage selon l'invention, l'installation est pourvue d'un dispositif permettant la mesure directe de la valeur de l'écartement des rouleaux de planage en au moins deux points, l'un situé dans la zone d'entrée de la machine et l'autre situé dans la zone de sortie. Dans ce cas le dispositif électronique permet d'asservir I' ecartement mesuré des rouleaux de planage situés dans la zone d'entrée de la machine et respectivement dans la zone de sortie à la valeur théorique donnée par le modèle pour I 'ecartement des rouleaux situés dans la zone d'entrée de la machine et respectivement dans la zone de sortie en agissant de manière indépendante sur les dispositifs de réglage de l'imbrication des rouleaux de chacune des zones respectivement d'entrée et de sortie. Ces dispositifs sont, de manière préférentielle à commande hydraulique. Dans une disposition très améliorée de l'invention des dispositifs indépendants permettent la mesure directe de la valeur de l'écartement de chaque paire de rouleaux actifs de planage de manière séparée. L'installation de planage à rouleaux parallèles comporte un moyen de réglage individuel de la position de chaque rouleau de planage et un dispositif électronique permettant d'asservir l'écartement mesuré de chacun des rouleaux de planage à la valeur théorique donnée par le modèle pour l'écartement de chacun de ces rouleaux en agissant de manière indépendante sur leur dispositif de réglage de l'imbrication. L'installation de planage comporte avantageusement un dispositif de réglage de l'imbrication de chaque rouleau à commande hydraulique. Dans une installation de planage à rouleaux parallèles selon l'invention les dispositifs électroniques permettant d'asservir l'écartement mesuré des rouleaux de planage à la valeur théorique donnée par le modèle comportent un dispositif de réglage différentiel permettant de régler un basculement latéral des rouleaux d'un côté par rapport à l'autre et par rapport à la valeur de consigne, pour permettre un tarage du dispositif par un procédé d'équinivelage sur un tôle usinée plane et d'épaisseur connue. Mais l'invention sera mieux comprise par la description de certains modes de réalisation particuliers, donnés à titre d'exemple et représentés sur les dessins. La figure 1 est une vue en élévation de l'installation, en coupe suivant son plan médian vertical parallèle à la direction de défilement, les équipages de planage étant en position ouverte. La figure 2 est un schéma d'ensemble des circuits de commande des vérins. Sur la figure 1 on a représenté la partie mécanique de l'ensemble d'une installation selon l'invention comprenant, d'une façon générale, une cage de soutien 1 , un équipage de planage supérieur 2 et un équipage de planage inférieur 2' multi-rouleaux. D'une façon générale, la cage de soutien fixe 1 comprend un sommier inférieur 11 , deux montants latéraux placés de part et d'autre d'un plan médian longitudinal P de défilement de la bande 10 à planer et un sommier supérieur 14. Chaque montant latéral est constitué d'une paire de colonnes écartées 12, 12', 13 (sur les figures, seules trois colonnes sont visibles). Ces colonnes et le sommier supérieur, formant généralement une dalle rigide, sont équipés de dispositifs variés connus en eux même et largement décrits dans l'art antérieur qui peuvent coopérer pour permettre un coulissement vertical du sommier 14 le long des quatre colonnes 12, 12', 13. Ce mouvement peut être mécanique mettant en œuvre des vis motorisées ou hydraulique comme représenté sur la figure 1. Dans ce cas on dispose de quatre vérins 3 installés au sommet de chaque colonne. Dans la disposition représentée chaque vérin est constitué d'un corps 31 fixé sur le sommier 14 et d'un piston 32 solidaire de la colonne. Le sommier inférieur 11 étant fixe, le sommier supérieur 14 peut donc se déplacer, sous l'action des quatre vérins 3, les pistons des vérins restant au même niveau. Les vérins 3 sont positionnés pour régler l'imbrication souhaitable des rouleaux par rapport à l'épaisseur de la tôle à planer de manière à réaliser l'ondulation déterminée par le modèle théorique. Ils exercent l'effort de planage pendant le passage du produit. On peut aussi imaginer d'autres dispositions, comme celle comportant des pistons mobiles et des corps de vérins fixes, sans sortir du cadre de l'invention. Chaque équipage de planage 2, 2' comprend une rangée de rouleaux actifs 4, 4' associés à une rangée de rouleaux d'appui 5, 5' l'ensemble étant porté par un châssis. Chaque rouleau actif 4, 4' est monté rotatif sur deux paliers définissant son axe de rotation, il s'appui sur un rouleau d'appui 5, 5' monté rotatif sur deux paliers d'extrémité. Sur la représentation de la figure 1 , les paliers d'extrémité 51 de l'équipage de planage supérieur 2 prennent appui sur le sommier supérieur par l'intermédiaire d'un organe de support 52. Dans une version plus élaborée de l'invention, cet organe de support peut comporter un dispositif de réglage qui permet de modifier de manière individuelle pour chaque rouleau actif son imbrication, dont la valeur globale est donnée par le positionnement du sommier de l'équipage de planage supérieur 2 à l'aide des vérins 3. Ces dispositifs de réglages peuvent être mécaniques, comme par exemple un système à coins, ou bien peuvent être constitués par une rangée de vérins hydrauliques comme dans le brevet FR 2 732 913. Dans ce cas il sera possible, en plus du réglage individuel de l'imbrication, d'obtenir par le réglage différentiel des vérins d'une même rangée, un effet de cambrage des cylindres actifs de manière à mieux répartir l'effet de planage sur la largeur de la bande à planer. Selon une caractéristique essentielle de l'invention on dispose au moins un capteur 6 permettant de mesurer en permanence la valeur absolue de l'écartement des cylindres actifs 4, 4', de manière indépendante de la déformation des colonnes et de l'ensemble de la machine, installé par exemple entre les équipages de planage supérieur 2 et inférieur 2'. Dans la représentation de la figure 1 on a représenté deux capteurs 6 et 6' l'un à l'entrée de la machine et l'autre dans la zone de sortie de manière à pouvoir contrôler plus précisément la variation du taux de plastification ainsi que cela à été décrit dans l'exposé général du problème. Dans un mode de réalisation particulier de l'invention, et pour une utilisation plus large de toutes les possibilités de la machine, on pourra installer un capteur permettant de mesurer individuellement l'écartement de chaque paire 4, 4' de rouleaux actifs. Les capteurs peuvent être de tout type, et par exemple du type LVDTThe subject of the invention is a method for increasing the precision of the control of the trajectory of the product in a planing machine with nested rollers and the leveling installation allowing the implementation of the process. For leveling flat products and, in particular, rolled metal strips, a multi-roller leveler is often used comprising two leveling units each carrying a series of rollers with parallel axes and placed, respectively, above and below the strip, the rollers being offset longitudinally and vertically so as to overlap by determining an undulating path of the strip which is thus subjected to traction-bending effects in alternating directions. The operation of such a machine has been the subject of advanced theoretical approaches. These theories of leveling are based on the calculation of the maximum curvatures of the sheet in the leveler, these curvatures generate a plasticization of the material in the thickness of the product which conditions the stress relieving of the stresses in the width and the thickness. Any leveler can be broken down into two zones whose functions are very different but complementary and interactive. The entry zone, which includes the first three or four rolls, is a significant plasticization zone in which visual flatness defects such as long edges or long center, "quarter of the band" defects and any distribution are eliminated. heterogeneous cross section of longitudinal constraints. The exit zone, which includes the last three or four rolls, has the function of reducing the gradients of the normal and transverse stresses in the thickness to assure the sheet a virtually zero residual hanger and tile. We know how to establish efficient theoretical calculations to obtain a precise theoretical result and which can be used for presetting machines. The principle is based on the gradual decrease in the rate of plasticization. This can only be obtained with machines comprising a sufficient number of leveling rollers and allowing an adequate adjustment of the nesting of each of these rollers. If the precision required for the first rollers is relatively low, since a high plasticization rate is sought, that required for adjusting the rollers of the outlet zone is high, and this all the more so when the thicknesses of the sheets to be planed are more fines. It is therefore desirable to have machines whose rollers all have an independent adjustment, which is of sufficient accuracy, reliable and repetitive. A leveling installation therefore generally comprises a fixed support cage, two leveling units with parallel rollers, placed respectively above and below the strip and the rollers of which are nested so as to determine a path. corrugated strip and means for adjusting and maintaining the spacing of said crews by pressing on the fixed cage for adjusting the nesting of the rollers, each leveling crew comprising a row of parallel active rollers supported on a chassis of support by means of at least one row of support rollers and mounted to rotate, at their ends, each on two bearings defining an axis of rotation perpendicular to the direction of travel, said bearings being carried, respectively, by two side parts integral with the support frame. Most often the lower leveling crew is fixed in position, the upper crew being able to move vertically for adjusting the nesting. For this purpose, four mechanical or hydraulic actuators are generally used mounted at the corners of the chassis and making it possible to adjust the general level of the adjustable crew relative to the fixed lower crew and, consequently, the nesting of the rollers. In addition, the input and output actuators can be adjusted differently, which makes it possible to determine a tilting generally necessary for the realization of the two leveling effects established by the theory and exposed above. The actuators can also be adjusted differently from one side relative to the other by introducing a lateral tilting so as to correctly distribute the leveling effect over the width of the product to be leveled. The forces developed for leveling are very high, in particular when this operation is carried out on a heavy sheet after hot rolling and accelerated cooling, or else on a cold sheet. It is therefore necessary to give the levelers a structure as rigid as possible so as to be able to control the effects of leveling. The deformation under stress of the different parts of the machine (also called yielding) distorts the precision of the control of the position of the leveling rollers, therefore the exact value of the curvature obtained on each roller. The overall yielding of the machine modifies the targeted plasticization rate, therefore there is a risk in the entry area of not completely eliminating the flatness defects, it also modifies the rate of decrease in plasticization, therefore the transition with the exit area and may not eliminate residual stresses as expected. In addition, there may be a transverse yielding, from one side to the other, which will modify the rate of plasticization in the entry zone and its homogeneity in the width of the product, it may even create flatness defects. To overcome these drawbacks, hydraulic levelers have been produced for the movement of the mobile leveling equipment, and also for the individual control of each leveling roller, and a ceding model based on the measurements has been associated. effort and a theoretical calculation of the deformations of the machine under stress, to compensate for these deformations, as in the applicant's patent FR 2 732 913. But all of these compensations are vitiated by errors due to the non-linearities of the yielding of the machine and which originate from the friction that is found between the fixed parts and the moving parts of the machine. In addition, the leveling module of a leveler, even of robust design is of the order of 100 t / mm per column, or the leveling effort for a sheet of 3 meters in width can be from 1000 tonnes to 2500 tonnes which leads to a yield (without compensation) of 2.5 mm to 5 mm. The precision requested is not very high in the entry area of the machine and could accommodate a simple yield compensation, there would however be the risk of having refusal of engagement of the product in a machine set too tight as a precaution. On the other hand, the precision required on the curves for the elimination of residual stresses in the exit area requires precise control of the position of the rollers by a few tenths of a millimeter. Controlling the transition zone ultimately involves having precise control over practically all the rollers, especially since for certain applications the pitch of the rollers rigidly held in position will be varied so as to increase the capacity of the leveler , as it is said in patent FR 2 732 913. This will have the effect of displacing the entry area and the exit area and will therefore also contribute to a search for greater precision in controlling the position of all the leveler rollers. The invention therefore aims to increase the precision of the control of these machines and a machine equipped with a new control device and making it possible to solve all of these problems without causing any complication or excessive cost of the devices used. The compensation for yielding is replaced by a real-time model for presetting the position of the leveling rollers associated with a direct measurement of the spacing of the active rollers. In a method according to the invention, a theoretical presetting model is installed which gives at least one reference value for the presetting of nestings and at least one value of the spacing of the leveling rollers is directly measured, which is compared to the reference values and the leveling rollers are adjusted to maintain the measured values equal to the reference values so as to maintain the trajectory of the product to be leveled inside the machine in accordance with l ripple provided by the model to achieve leveling. In particular, two measurements are made of the value of the spacing of the leveling rollers, a first at the inlet of the machine and, respectively, a second at the outlet of the machine, which are compared each of these measurements with the reference value given by the model for the same rollers, respectively at the inlet and at the outlet of the machine and one acts on the members for adjusting the position of the leveling rollers at the inlet and respectively at the outlet of the machine for keep the measured value equal to the value of the reference so as to achieve the decrease in the rate of plasticization predicted by the model to achieve leveling. In the complete method according to the invention, a measurement is made of the value of the spacing of each of the leveling rollers which is compared to each reference value given by the model and action is taken on the individual adjustment members of the position of each of the leveling rollers to maintain the measured value equal to the value of the reference so as to achieve the undulation and the decrease in the rate of plasticization predicted by the model for achieving leveling. But position control requires ensuring that at uniform positions of the leveling rollers, given by position sensors, identical leveling forces correspond. A kind of calibration must first be carried out so as not to depend on the mounting mode of the sensors in the machine and the position of their 'zero' reference. In a method according to the invention, a calibration is carried out, called equalization of the active rollers on a flat machined sheet of known thickness by differentially modifying the position of the active rollers by lateral tilting from one side to the other. so as to obtain equal leveling forces on both sides of the machine measured by the measuring devices. In a more elaborate method of the invention, the leveling is carried out on a moving sheet by differentially modifying the position of the active rollers by a lateral tilting from one side to the other and which is carried out. equalization of the averages of the forces recorded by the measuring devices on each side during said scrolling. In a leveling installation with parallel rollers according to the invention, there is a device allowing direct measurement of the value of the spacing of the leveling rollers at at least one point so as to know the exact value of the nesting by direct measurement. The installation also includes, and still according to the invention, an electronic device making it possible to control the measured spacing of the leveling rollers to the theoretical value given by the model by acting on the devices for adjusting the nesting. In an improved version of the invention, the nesting adjustment devices are hydraulically operated. In another arrangement of a leveling installation according to the invention, the installation is provided with a device allowing the direct measurement of the value of the spacing of the leveling rollers at at least two points, one located in the machine entry area and the other located in the exit area. In this case, the electronic device makes it possible to control the measured spacing of the leveling rollers situated in the entry zone of the machine and respectively in the exit zone at the theoretical value given by the model for the spacing of the situated rollers. in the entry zone of the machine and respectively in the exit zone by acting independently on the devices for adjusting the nesting of the rollers of each of the entry and exit zones respectively. These devices are preferably hydraulically operated. In a very improved arrangement of the invention, independent devices allow the direct measurement of the value of the spacing of each pair of active leveling rollers separately. The leveling installation with parallel rollers comprises a means for individually adjusting the position of each leveling roller and an electronic device making it possible to control the measured spacing of each of the leveling rollers to the theoretical value given by the model for the 'spacing of each of these rollers by acting independently on their nesting adjustment device. The leveling installation advantageously comprises a device for adjusting the nesting of each roller with hydraulic control. In a leveling installation with parallel rollers according to the invention, the electronic devices making it possible to control the measured spacing of the leveling rollers to the theoretical value given by the model include a differential adjustment device making it possible to adjust a lateral tilting of the rollers d 'one side with respect to the other and with respect to the set value, to allow the device to be tared by a leveling process on a flat machined sheet of known thickness. However, the invention will be better understood by the description of certain particular embodiments, given by way of example and shown in the drawings. Figure 1 is an elevational view of the installation, in section along its vertical median plane parallel to the direction of travel, the planing crews being in the open position. Figure 2 is an overall diagram of the actuator control circuits. In Figure 1 there is shown the mechanical part of the assembly of an installation according to the invention comprising, in general, a support cage 1, an upper leveling equipment 2 and a lower leveling equipment 2 ' multi-roll. Generally, the fixed support cage 1 comprises a lower bed base 11, two lateral uprights placed on either side of a longitudinal median plane P of travel of the strip 10 to be leveled and an upper bed base 14. Each lateral upright consists of a pair of spaced apart columns 12, 12 ', 13 (in the figures, only three columns are visible). These columns and the upper base, generally forming a rigid slab, are equipped with various devices known in themselves and widely described in the prior art which can cooperate to allow vertical sliding of the base 14 along the four columns 12, 12 ' , 13. This movement can be mechanical using motorized or hydraulic screws as shown in Figure 1. In this case there are four cylinders 3 installed at the top of each column. In the arrangement shown each cylinder consists of a body 31 fixed to the base 14 and a piston 32 secured to the column. The lower base 11 being fixed, the upper base 14 can therefore move, under the action of the four jacks 3, the pistons of the jacks remaining at the same level. The jacks 3 are positioned to adjust the desirable nesting of the rollers relative to the thickness of the sheet to be planed so as to achieve the corrugation determined by the theoretical model. They exert the leveling force during the passage of the product. One can also imagine other arrangements, such as that comprising movable pistons and bodies of fixed jacks, without departing from the scope of the invention. Each leveling device 2, 2 ′ comprises a row of active rollers 4, 4 ′ associated with a row of support rollers 5, 5 ′, the whole being carried by a chassis. Each active roller 4, 4 'is rotatably mounted on two bearings defining its axis of rotation, it is supported on a support roller 5, 5' rotatably mounted on two end bearings. In the representation of FIG. 1, the end bearings 51 of the upper leveling equipment 2 are supported on the upper base by means of a support member 52. In a more elaborate version of the invention, this support member may include an adjustment device which makes it possible to individually modify for each active roller its nesting, the overall value of which is given by the positioning of the bed base of the upper leveling crew 2 using the jacks 3 These adjustment devices can be mechanical, such as for example a wedge system, or can be constituted by a row of hydraulic cylinders as in patent FR 2 732 913. In this case it will be possible, in addition to the individual adjustment of the nesting, to obtain by the differential adjustment of the cylinders of the same row, a cambering effect of the active cylinders so as to better distribute the leveling effect over the width of the band to hover. According to an essential characteristic of the invention, there is at least one sensor 6 making it possible to continuously measure the absolute value of the spacing of the active cylinders 4, 4 ′, independently of the deformation of the columns and of the whole of the machine, installed for example between the upper 2 and lower 2 ′ leveling crews. In the representation of FIG. 1, two sensors 6 and 6 ′ are shown, one at the inlet of the machine and the other in the outlet area so as to be able to more precisely control the variation in the plasticization rate as well as this has been described in the general description of the problem. In a particular embodiment of the invention, and for a wider use of all the possibilities of the machine, it is possible to install a sensor making it possible to individually measure the spacing of each pair 4, 4 ′ of active rollers. The sensors can be of any type, and for example of the LVDT type
(Linear Variable Differential Transformer) avec le corps fixé à un équipage de planage et la tige à l'autre. Ils peuvent également être sans contact, par exemple ultrasoniques, à laser, à filtre optique, à réseau de Bragg, etc.. La figure 2 représente l'ensemble des dispositifs mécaniques et électriques associés pour constituer une machine de planage selon l'invention. La partie mécanique de la machine est représentée schématiquement dans une coupe transversale. Le ou les capteurs 6 sont montés sur un côté de la machine, les vérins hydrauliques 3 sont équipés de capteurs 35 permettant la mesure des efforts globaux de planage. Ces vérins sont alimentés par un dispositif classique 8 de pompe et d'accumulateur par l'intermédiaire de deux servo valves ou de deux groupes de servo valves 71 , 72 alimentant chaque côté de la machine. Ces servo valves sont commandées par au moins un circuit électronique de contrôle se décomposant en deux circuits électroniques commandant chacun une servo-valve ou un groupe de servo-valves. Dans une installation selon l'invention on réalise une boucle fermée de la valeur mesurée de l'écartement des rouleaux actifs 4, 4' sur la position de référence introduite dans le circuit électronique de commande des servo valves. Ces circuits électroniques (91 ,92) qui peuvent être analogiques ou bien des calculateurs numériques comportent des circuits sommateurs et des circuits classiques de contrôle proportionnel, intégral et différentiel dits 'PID'. Selon une disposition préférentielle de l'invention, les valeurs de références correspondant à l'imbrication souhaitable des rouleaux actifs sont élaborées par un modèle de planage 110 implémenté dans un calculateur de process 100, elles sont introduites dans les circuits électronique de contrôle des servo valves (91 , 92) via un étage sommateur / différentiateur 93, 94 qui permet d'introduire une commande de basculement de la machine d'un côté par rapport à l'autre. Les capteurs d'effort 35 sont connectés au calculateur 100 dans lequel sera élaboré une consigne de basculement, celle- ci est sommée à la référence d'imbrication dans le circuit 94 pour être envoyé comme signal de commande pour un côté de la machine, elle est différentiée par rapport au même signal dans le circuit 93 pour être envoyé comme signal de commande pour l'autre côté de la machine. Par ailleurs, et de manière classique le calculateur 100 est connecté à des appareils d'interface opérateur tels qu'écran et pupitre de commande 101 , imprimante et enregistreur 102 de manière à pouvoir commander le fonctionnement de la machine et gérer sa production. Dans un mode de réalisation plus élaboré de l'invention, par exemple avec un capteur dans la zone d'entrée de la machine et l'autre dans la zone de sortie, le même type de circuit sera utilisé. Les vérins 3 situés du côté entrée et ceux du côte sortie sont alimentés séparément par des servo valves et tous les circuits électroniques 9 décrits plus haut sont doublés pour le contrôle indépendant de chaque zone ; bien entendu c'est le même calculateur 100 qui élabore toutes les références et les distribue sur l'ensemble des circuits électroniques de contrôle. Dans un autre mode de réalisation, toujours selon l'invention, les organes de support 52 de chacun rouleau d'appui supérieur 5 sont des organes de réglage et permettent de commander individuellement chaque rouleau actif supérieur 4, on réalise de manière individuelle et séparée une mesure de l'écartement entre chacun des rouleaux actifs supérieurs et inférieurs et un dispositif de contrôle similaire à celui décrit est installé pour chaque paire de cylindres actifs. Dans le cas où les organes de support 52 sont des organes de réglage constitués de vérins hydrauliques, on réalise un dispositif de contrôle (9) du type de celui décrit plus haut pour chaque paire de cylindre actif. Le calculateur 100 sert à élaborer toutes les consignes et à les distribuer sur tous les circuits de contrôle électroniques 9. Dans ce cas les vérins principaux 3 ne servent plus à ces fonctions et sont utilisés pour régler l'ouverture et la fermeture générale de la machine selon l'épaisseur de la tôle à planer. L'ondulation exacte souhaitée est obtenue par le réglage de l'imbrication individuelle de chaque rouleau 4 au moyen des dispositifs de réglage 52. Dans un procédé selon l'invention, on mesure l'écartement des rouleaux actifs 4,4', on compare à la consigne de référence élaborée à l'aide du modèle de planage et on introduit la correction nécessaire de façon à annuler l'erreur résultant des déformations de la machine sous l'effort de planage en agissant sur les moyens de réglage de l'imbrication. La mesure absolue de l'écart des cylindres actifs est obtenue à l'aide des capteurs 6, cette valeur est comparée avec la référence dans les circuits 91 et 92 et le signal résultant sert à commander la servo valve 7 qui permet de déplacer les vérins 3 contrôlant le déplacement de l'équipement de planage. La référence est obtenue en combinant la cote élaborée par le modèle de planage 110 et la consigne de basculement. Les deux grandeurs sont additionnées dans le circuit 94 pour être appliquées sur un côté de la machine, elles sont soustraites dans le circuit 93 pour être appliquées sur l'autre côté de la machine, de manière à réaliser un basculement équilibré et réparti par côté par rapport à la valeur de l'imbrication théorique nécessaire pour obtenir l'ondulation définie par le modèle. Dans un mode de réalisation préférentiel de l'invention, on réalise une mesure absolue de l'écart des cylindres actifs 4, 4' dans la zone d'entrée de la machine, et une autre dans la zone de sortie. On compare ces mesures aux consignes de références élaborées à l'aide du modèle de planage pour chacune de ces deux zones et on introduit les corrections nécessaires de façon à annuler les erreurs résultant des déformations de la machine sous l'effort de planage en agissant sur les moyens 3 de réglage de l'imbrication de la zone d'entrée et de la zone de sortie, en agissant de manière séparée par des circuits spécifiques de contrôle des vérins 3 de la zone d'entrée et de ceux de la zone de sortie. Dans un autre mode de réalisation de l'invention, on réalise une mesure absolue de l'écart des cylindres actifs 4, 4' pour chaque paire de cylindres actifs. On compare ces mesures aux consignes de références élaborées à l'aide du modèle 110 de planage pour chacune des paires de cylindres actifs et on introduit les corrections nécessaires de façon à annuler les erreurs résultant des déformations de la machine sous l'effort de planage en agissant sur les moyens 52 de réglage de l'imbrication de chaque paire de cylindres actifs. Il convient de remarquer que l'équipage de planage inférieur comporte un rouleau de plus que l'équipage de planage supérieur. De ce fait, un rouleau de planage supérieur est toujours en regard de l'espace entre deux rouleaux de planage inférieurs adjacents. Dans ces conditions, ce qu'on appelle « l'écart des cylindres actifs 4, 4' pour chaque paire de cylindres actifs » est la distance entre la tangente horizontale à un rouleau actif supérieur et la tangente aux deux rouleaux inférieurs disposés en dessous du rouleau supérieur. Cet écart peut être mesuré en faisant la moyenne des distance du rouleau supérieur à chacun des deux rouleaux inférieurs correspondants. Dans tous les cas, et selon le procédé de l'invention, les références d'imbrication élaborées par le modèle de planage 110 sont ajoutées à une consigne de basculement pour commander un côté de la machine, et retranchées pour commander l'autre côté; de manière à réaliser un basculement équilibré et réparti par côté par rapport à la valeur de l'imbrication théorique nécessaire pour obtenir l'ondulation définie par le modèle. Bien entendu, et toujours dans le cadre d'un procédé selon l'invention, si les moyens de réglage individuels de l'imbrication des cylindres actifs 52 sont constitués par une rangée de vérins hydraulique, il sera avantageux de superposer au réglage de l'imbrication de la rangée de vérins, un réglage individuel différentiel de chaque vérin permettant de réaliser un effet de cambrage sur le rouleau actif de manière à obtenir une meilleure répartition de l'effet de planage sur la largeur du produit à planer. Dans un procédé selon l'invention, les consignes de basculement sont établies lors d'un phase d'équinivelage sur un produit usiné plat et d'épaisseur connue servant de calibre. On introduit ce produit ou calibre dans la machine et on commande une légère imbrication pour provoquer un serrage des rouleaux actifs sur le produit ou calibre. On mesure alors les efforts de planage induits de chaque côté de la machine, par exemple à l'aide des capteurs d'effort 35 installés sur les vérins 3 lorsque l'on est en présence d'une machine du type décrit sur la figure 2. On commande alors un basculement de façon à équilibrer les efforts d'un côté et de l'autre de la machine, s'ils ne le sont pas au départ, en resserrant le côté de la machine qui génère l'effort le plus petit, et on note la valeur du basculement qui permet d'obtenir l'égalité des efforts de chaque côté. Toute cette séquence est gérée par le calculateur 100 qui permet de mémoriser les valeurs des efforts et celles des basculements produits. Ces valeurs sont ensuite utilisées pendant l'exploitation de la machine en tant que préréglage de basculement pour tous les réglages d'imbrication qui seront déterminés par le modèle installé dans le calculateur 100, et selon le mode de réalisation qui a été décrit précédemment. Ce procédé d'équinivelage est, selon l'invention, utilisé avec tous les modes de réalisation du procédé décrits, c'est à dire qu'il peut être mis en œuvre par les deux groupes des vérins 3 (un groupe pour chaque côté de la machine) dans le cas ou on ne dispose que d'un capteur pour la mesure de l'écartement des rouleaux actifs, mais il peut aussi être mis en œuvre en procédant à un équinivelage simultané mais indépendant des vérins 3 de la zone d'entrée et de ceux de la zone de sortie dans le cas ou on dispose d'une mesure dans chacune de ces zones. On peut aussi établir une procédure d'équinivelage équivalente, et toujours selon le procédé de l'invention, dans le mode de réalisation pour lequel les dispositifs support 52 de chaque rouleau actif supérieur 4 est un dispositif constitué d'une rangée de vérins hydrauliques, ainsi que d'une mesure absolue de l'écartement pour chaque paire de rouleaux actifs. La procédure est la même et consiste à commander un basculement de chaque paire de rouleaux actifs jusqu'à l'obtention de l'égalité des efforts appliqués en leur extrémité, et d'utiliser cette valeur de basculement comme consigne pour toute l'exploitation ultérieure de la machine. Selon un procédé amélioré de l'invention, l'équinivelage est réalisé sur une bande en défilement. On utilise pour cela un produit usiné plat et d'épaisseur connue et constante, on commande une légère imbrication des rouleaux actifs correspondant à une cote un peu inférieure à l'épaisseur du produit qui sert de calibre, et on introduit et on fait défiler le produit dans la machine. On mesure et on mémorise les efforts générés de chaque côté de la machine et on calcule leur valeur moyenne pendant tout le temps du défilement. L'équinivelage sera alors réalisé en introduisant le basculement qui permettra d'égaliser ces valeurs moyennes. Bien entendu, l'invention ne se limite pas aux détails des modes de réalisation qui ont été décrits à titre de simple exemple, des variantes pouvant être utilisées sans s'écarter du cadre des revendications. Dans un mode de réalisation simplifié dans lequel on installe un seul capteur 6 pour mesurer l'écartement des rouleaux actifs 4,4', par exemple dans la zone centrale de la machine, on peut imaginer introduire un basculement réglable entre la zone d'entrée et la zone de sortie en l'introduisant au niveau des circuits électroniques 9, de manière à obtenir une décroissance du taux de plasticité, qui peut être nécessaire dans certains cas. En résumé, pour planer une tôle par le procédé selon l'invention, on commence par calculer à l'aide d'un modèle de planage, les écartements que doivent présenter en charge les rouleaux de planage. Le modèle de planage qu'on peut utiliser est par exemple un modèle que l'homme du métier connaît. Un tel modèle calcule le comportement du produit à planer et de la planeuse à partir des caractéristiques géométriques et mécaniques de la tôle à planer et de la planeuse (par exemple : épaisseur et largeur de la tôle, limite d'élasticité à la température de planage du métal dont elle est constituée, éventuellement amplitude et nature des défauts ; nombre de rouleaux planeurs, distance entre rouleaux d'un même équipage, diamètre des rouleaux). Il permet, par des méthodes que l'homme du métier saura mettre en œuvre, de déterminer un réglage optimal de la planeuse, et ainsi de déterminer des consignes de serrage notamment en entrée et en sortie de planeuse. Les consignes de réglages peuvent être complétées par des consignes d'équilibrage entre les deux côtés de la planeuse, déterminées par l'opération d'équinivelage. A l'aide des consignes de réglages, éventuellement complétées par les consignes d'équilibrage, on réalise d'abord un préréglage à vide de la planeuse, puis, au cours du planage (lorsque la planeuse est en charge), on régule les écartements des rouleaux actifs tels qu'ils sont mesurés pour qu'ils restent sensiblement égaux aux valeurs de consigne. Les signes de référence insérés après les caractéristiques techniques mentionnées dans les revendications, ont pour seul but de faciliter la compréhension de ces dernières et n'en limitent aucunement la portée. (Linear Variable Differential Transformer) with the body fixed to one leveling device and the rod to the other. They can also be contactless, for example ultrasonic, laser, optical filter, Bragg grating, etc. FIG. 2 represents all of the associated mechanical and electrical devices to constitute a leveling machine according to the invention. The mechanical part of the machine is shown schematically in a cross section. The sensor (s) 6 are mounted on one side of the machine, the hydraulic cylinders 3 are fitted with sensors 35 allowing the measurement of the overall leveling forces. These jacks are supplied by a conventional pump and accumulator device 8 via two servo valves or two groups of servo valves 71, 72 supplying each side of the machine. These servo valves are controlled by at least one electronic control circuit, which is broken down into two electronic circuits, each controlling a servo valve or a group of servo valves. In an installation according to the invention, a closed loop is produced of the measured value of the spacing of the active rollers 4, 4 ′ on the reference position introduced into the electronic circuit for controlling the servo valves. These electronic circuits (91, 92) which can be analog or else digital computers comprise summing circuits and conventional circuits of proportional, integral and differential control called 'PID'. According to a preferred arrangement of the invention, the reference values corresponding to the desirable nesting of the active rollers are developed by a leveling model 110 implemented in a process computer 100, they are introduced into the electronic circuits for controlling the servo valves. (91, 92) via a summing / differentiating stage 93, 94 which makes it possible to introduce a command for tilting the machine from one side relative to the other. The force sensors 35 are connected to the computer 100 in which a tilting instruction will be developed, this is added to the nesting reference in circuit 94 to be sent as a control signal for one side of the machine, it is differentiated from the same signal in circuit 93 to be sent as a control signal to the other side of the machine. Furthermore, and in a conventional manner, the computer 100 is connected to operator interface devices such as screen and control console 101, printer and recorder 102 so as to be able to control the operation of the machine and manage its production. In a more elaborate embodiment of the invention, for example with one sensor in the entry zone of the machine and the other in the exit zone, the same type of circuit will be used. The jacks 3 located on the inlet side and those on the outlet side are supplied separately by servo valves and all the electronic circuits 9 described above are doubled for independent control of each zone; of course it is the same computer 100 which prepares all the references and distributes them over all of the electronic control circuits. In another embodiment, still according to the invention, the support members 52 of each upper support roller 5 are adjustment members and make it possible to control each upper active roller 4 individually, a separate and individual embodiment is carried out. measurement of the spacing between each of the upper and lower active rollers and a control device similar to that described is installed for each pair of active cylinders. In the case where the support members 52 are adjustment members made up of hydraulic cylinders, a control device (9) of the type described above is produced for each pair of active cylinders. The computer 100 is used to draw up all the instructions and to distribute them on all the electronic control circuits 9. In this case the main jacks 3 are no longer used for these functions and are used to regulate the general opening and closing of the machine depending on the thickness of the sheet to hover. The exact undulation desired is obtained by adjusting the individual nesting of each roller 4 by means of the adjustment devices 52. In a method according to the invention, the spacing of the active rollers 4,4 'is measured, compared to the reference setpoint developed using the leveling model and the necessary correction is introduced so as to cancel the error resulting from the deformations of the machine under the leveling force by acting on the means for adjusting the nesting . The absolute measurement of the deviation of the active cylinders is obtained using the sensors 6, this value is compared with the reference in circuits 91 and 92 and the resulting signal is used to control the servo valve 7 which makes it possible to move the jacks 3 controlling the movement of the leveling equipment. The reference is obtained by combining the dimension developed by the leveling model 110 and the tilting instruction. The two quantities are added in circuit 94 to be applied on one side of the machine, they are subtracted in circuit 93 to be applied on the other side of the machine, so as to achieve a balanced tilting and distributed by side by compared to the value of the theoretical nesting necessary to obtain the undulation defined by the model. In a preferred embodiment of the invention, an absolute measurement is made of the distance between the active cylinders 4, 4 ′ in the entry zone of the machine, and another in the exit zone. These measurements are compared to the reference setpoints developed using the leveling model for each of these two zones and the necessary corrections are introduced so as to cancel the errors resulting from the deformations of the machine under the leveling force by acting on the means 3 for adjusting the nesting of the entry area and the exit area, acting separately by specific circuits for controlling the jacks 3 of the entry area and those of the exit area . In another embodiment of the invention, an absolute measurement is made of the distance between the active cylinders 4, 4 ′ for each pair of active cylinders. These measurements are compared with the reference instructions developed using the leveling model 110 for each of the pairs of active cylinders and the necessary corrections are introduced so as to cancel the errors resulting from the deformations of the machine under the leveling force by acting on the means 52 for adjusting the nesting of each pair of active cylinders. It should be noted that the lower leveling crew has one more roller than the upper leveling crew. As a result, an upper leveling roller is always opposite the space between two adjacent lower leveling rollers. Under these conditions, what is called "the gap of the active cylinders 4, 4 'for each pair of active cylinders" is the distance between the horizontal tangent to an upper active roller and the tangent to the two lower rollers arranged below the upper roller. This difference can be measured by averaging the distances from the upper roller to each of the two corresponding lower rollers. In all cases, and according to the method of the invention, the nesting references developed by the leveling model 110 are added to a tilting instruction to control one side of the machine, and subtracted to control the other side; so as to carry out a balanced tilting and distributed by side compared to the value of the theoretical nesting necessary to obtain the undulation defined by the model. Of course, and always within the framework of a method according to the invention, if the means for individual adjustment of the nesting of the active cylinders 52 are constituted by a row of hydraulic cylinders, it will be advantageous to superimpose the adjustment of the nesting of the row of cylinders, an individual differential adjustment of each cylinder making it possible to achieve a cambering effect on the active roller so as to obtain a better distribution of the leveling effect over the width of the product to be leveled. In a method according to the invention, the tilting instructions are established during a leveling phase on a flat machined product of known thickness serving as gauge. This product or size is introduced into the machine and a slight nesting is ordered to cause the active rollers to be clamped on the product or size. The leveling forces induced on each side of the machine are then measured, for example using the force sensors 35 installed on the jacks 3 when one is in the presence of a machine of the type described in FIG. 2. A tilting is then controlled so as to balance the forces on one side and the other of the machine, if they are not at the start, by tightening the side of the machine which generates the smallest effort, and we note the value of the tilting which makes it possible to obtain equal efforts on each side. This entire sequence is managed by the computer 100 which makes it possible to store the values of the forces and those of the tiltings produced. These values are then used during operation of the machine as a tilting preset for all the nesting settings which will be determined by the model installed in the computer 100, and according to the embodiment which has been described previously. This leveling process is, according to the invention, used with all of the embodiments of the process described, that is to say that it can be implemented by the two groups of jacks 3 (one group for each side of the machine) in the case where there is only one sensor for measuring the spacing of the active rollers, but it can also be implemented by performing a simultaneous but independent equalization of the cylinders 3 of the area entry and those of the exit zone in the case where there is a measurement in each of these zones. It is also possible to establish an equivalent leveling procedure, and always according to the method of the invention, in the embodiment for which the support devices 52 of each upper active roller 4 is a device consisting of a row of hydraulic cylinders, as well as an absolute gauge measurement for each pair of active rollers. The procedure is the same and consists in ordering a tilting of each pair of active rollers until the efforts applied at their end are equal, and using this tilting value as a setpoint for all subsequent operation. of the machine. According to an improved method of the invention, the leveling is carried out on a moving strip. For this, a flat machined product of known and constant thickness is used, a slight overlapping of the active rollers is controlled, corresponding to a dimension slightly less than the thickness of the product which serves as a gauge, and the produced in the machine. The forces generated on each side of the machine are measured and stored and their average value is calculated during the whole time of the travel. The equalization will then be carried out by introducing the tilting which will make it possible to equalize these average values. Of course, the invention is not limited to the details of the embodiments which have been described by way of simple example, variants which can be used without departing from the scope of the claims. In a simplified embodiment in which a single sensor 6 is installed to measure the spacing of the active rollers 4,4 ', for example in the central zone of the machine, one can imagine introducing an adjustable tilting between the input zone and the exit zone by introducing it at the level of the electronic circuits 9, so as to obtain a decrease in the rate of plasticity, which may be necessary in certain cases. In summary, to plan a sheet by the method according to the invention, one begins by calculating with the aid of a planing model, the spacings which the planing rollers must have under load. The leveling model that can be used is for example a model that the skilled person knows. Such a model calculates the behavior of the product to be leveled and the leveler from the geometric and mechanical characteristics of the sheet to be leveled and the leveler (for example: thickness and width of the sheet, elastic limit at the leveling temperature of the metal of which it is made, possibly amplitude and nature of the defects; number of planer rollers, distance between rollers of the same equipment, diameter of the rollers). It allows, by methods that a person skilled in the art will know how to determine, an optimal adjustment of the leveler, and thus to determine tightening instructions in particular at the entry and exit of the leveler. The adjustment instructions can be supplemented by balancing instructions between the two sides of the leveler, determined by the leveling operation. Using the adjustment instructions, possibly supplemented by the balancing instructions, we first carry out an empty presetting of the leveler, then, during leveling (when the leveler is in charge), we regulate the spacings of the active rollers as measured so that they remain substantially equal to the set values. The reference signs inserted after the technical characteristics mentioned in the claims are intended only to facilitate the understanding of the latter and in no way limit their scope.

Claims

REVENDICATIONS
1. Procédé d' augmentation de la précision du contrôle de la trajectoire du produit dans une machine à planer du type comportant une cage de soutien fixe (1 ), deux équipages de planage à rouleaux parallèles, placés respectivement au-dessus (2) et en dessous (2') de la bande, les dispositifs nécessaires au réglage de l'imbrication des rouleaux (3,52), des moyens de mesure (35) des efforts de planage au moins des deux côtés de la machine, caractérisé par le fait qu'un modèle théorique (110) de préréglage donne au moins une valeur de référence pour le préréglage des imbrications et que, au cours du planage, l'on mesure directement au moins une valeur de l'écartement des rouleaux de planage, que l'on compare aux valeurs de référence et que l'on agit sur les organes de réglage de la position des rouleaux de planage (3,52) pour maintenir les valeurs mesurées égales aux valeurs de la référence avec une précision accrue de manière à maintenir la trajectoire du produit à planer à l'intérieur de la machine conformément à l'ondulation prévue par le modèle (110) pour réaliser le planage. 1. Method for increasing the precision of the control of the trajectory of the product in a leveling machine of the type comprising a fixed support cage (1), two leveling crews with parallel rollers, placed respectively above (2) and below (2 ') the strip, the devices necessary for adjusting the nesting of the rollers (3,52), means for measuring (35) the leveling forces at least on both sides of the machine, characterized by fact that a theoretical presetting model (110) gives at least one reference value for the presetting of overlaps and that, during planing, at least one value of the spacing of the leveling rollers is directly measured, that it is compared to the reference values and that one acts on the members for adjusting the position of the leveling rollers (3.52) in order to keep the measured values equal to the reference values with increased precision so as to maintain the trajectory of u product to be leveled inside the machine in accordance with the corrugation provided by the model (110) to achieve leveling.
2. Procédé d' augmentation du contrôle de la trajectoire du produit dans une machine à planer selon la revendication 1 , caractérisé en ce que l'on réalise deux mesures de la valeur de l'écartement des rouleaux de planage, une première à l'entrée de la machine et, respectivement, une seconde à la sortie de la machine, que l'on compare chacune de ces mesures à la valeur de référence donnée par le modèle (110) et que l'on agit sur les organes de réglage (3,52) de la position des rouleaux de planage en entrée et respectivement en sortie de la machine pour maintenir la valeur mesurée égale à la valeur de la référence avec une précision accrue de manière à pouvoir réaliser la décroissance du taux de plastification prévue par le modèle (110) pour réaliser le planage. 2. Method for increasing the control of the trajectory of the product in a leveling machine according to claim 1, characterized in that two measurements are made of the value of the spacing of the leveling rollers, a first to the input of the machine and, respectively, one second at the output of the machine, that one compares each of these measurements to the reference value given by the model (110) and that one acts on the adjustment members ( 3.52) of the position of the leveling rollers at the inlet and respectively at the outlet of the machine to maintain the measured value equal to the value of the reference with increased precision so as to be able to achieve the decrease in the rate of plasticization provided for by the model (110) for leveling.
3. Procédé de contrôle de la trajectoire du produit dans une machine à planer selon la revendication 1 , caractérisé en ce que l'on réalise une mesure de la valeur de l'écartement de chacun des rouleaux de planage (4,4') que l'on compare chacune de ces mesures à la valeur de référence donnée par le modèle (110) et que l'on agit sur les organes de réglage (3) individuels de la position de chacun des rouleaux de planage pour maintenir la valeur mesurée égale à la valeur de la référence avec une précision accrue de manière à réaliser l'ondulation et la décroissance du taux de plastification prévues par le modèle (110) pour réaliser le planage. 3. Method for controlling the trajectory of the product in a leveling machine according to claim 1, characterized in that a measurement is made of the value of the spacing of each of the leveling rollers (4,4 ') that one compare each of these measurements with the reference value given by the model (110) and that one acts on the individual adjustment members (3) of the position of each leveling roller to keep the measured value equal to the value of the reference with an increased precision so as to carry out the undulation and the decrease in the rate of plasticization envisaged by the model (110) to carry out the leveling.
4. Procédé de contrôle de la trajectoire du produit dans une machine à planer selon l'une quelconque des revendications précédentes, caractérisé en ce que l'on procède à un équinivelage des rouleaux actifs sur une tôle usinée plane d'épaisseur connue en modifiant de façon différentielle la position des rouleaux actifs par un basculement latéral d'un côté sur l'autre de manière à obtenir l'égalité des efforts de planage des deux côtés de la machine mesurés par les dispositifs de mesure (35). 4. Method for controlling the trajectory of the product in a leveling machine according to any one of the preceding claims, characterized in that one proceeds to a leveling of the active rollers on a flat machined sheet of known thickness by modifying Differentially the position of the active rollers by a lateral tilting from one side to the other so as to obtain equal leveling forces on both sides of the machine measured by the measuring devices (35).
5. Procédé de contrôle de la trajectoire du produit dans une machine à planer selon la revendication 4, caractérisé en ce que l'équinivelage est réalisé sur une tôle en défilement en modifiant de façon différentielle la position des rouleaux actifs par un basculement latéral d'un côté sur l'autre et que l'on procède à l'égalisation des moyennes des efforts enregistrés par les dispositifs de mesure (35) de chaque côté pendant ledit défilement. 5. A method of controlling the trajectory of the product in a leveling machine according to claim 4, characterized in that the leveling is carried out on a moving sheet by differentially modifying the position of the active rollers by a lateral tilting of one side on the other and that the averages of the forces recorded by the measuring devices (35) on each side are equalized during said scrolling.
6. Installation de planage à rouleaux parallèles pour la mise en œuvre du procédé selon l'une quelconque des revendications 1 à 5, comportant une cage de soutien fixe (1), deux équipages de planage à rouleaux parallèles, placés respectivement au-dessus (2) et en dessous (2') de la bande, des dispositifs (3,52) nécessaires au réglage de l'imbrication des rouleaux (4,4') et des moyens de mesure (35) des efforts de planage au moins de chaque côté de la machine, caractérisée en ce que l'installation est pourvue d'au moins un dispositif (6, 6') permettant la mesure directe de la valeur de l'écartement des rouleaux de planage en au moins un point. 6. Installation for leveling with parallel rollers for implementing the method according to any one of claims 1 to 5, comprising a fixed support cage (1), two planes for leveling with parallel rollers, respectively placed above ( 2) and below (2 ′) the strip, devices (3,52) necessary for adjusting the nesting of the rollers (4,4 ′) and means for measuring (35) the leveling forces of at least each side of the machine, characterized in that the installation is provided with at least one device (6, 6 ') allowing direct measurement of the value of the spacing of the leveling rollers at at least one point.
7. Installation de planage à rouleaux parallèles selon la revendication 6, caractérisée en ce qu'elle comporte au moins un dispositif électronique (9) permettant d'asservir I' ecartement mesuré des rouleaux de planage à la valeur théorique donnée par le modèle (110) en agissant sur les dispositifs (3) de réglage de l'imbrication. 7. parallel roller leveling installation according to claim 6, characterized in that it comprises at least one electronic device (9) allowing to control the measured spacing of the leveling rollers to the theoretical value given by the model (110) by acting on the devices (3) for adjusting the nesting.
8. Installation de planage à rouleaux parallèles selon la revendication 7, caractérisée en ce que les dispositifs de réglage de l'imbrication (3) sont à commande hydraulique. 8. Parallel roller leveling installation according to claim 7, characterized in that the nesting adjustment devices (3) are hydraulically operated.
9. Installation de planage à rouleaux parallèles selon la revendication 6, caractérisée en ce que l'installation est pourvue d'un dispositif permettant la mesure directe de la valeur de l'écartement des rouleaux de planage en au moins deux points, l'un (6) situé dans la zone d'entrée de la machine et l'autre (6') situé dans la zone de sortie. 9. Leveling installation with parallel rollers according to claim 6, characterized in that the installation is provided with a device allowing the direct measurement of the value of the spacing of the leveling rollers at at least two points, one (6) located in the entry area of the machine and the other (6 ') located in the exit area.
10. Installation de planage à rouleaux parallèles selon la revendication10. Parallel roller leveling installation according to claim
9, caractérisée en ce qu'elle comporte au moins un dispositif électronique (9) permettant d'asservir l'écartement mesuré des rouleaux de planage situés dans la zone d'entrée de la machine et respectivement dans la zone de sortie à la valeur théorique donnée par le modèle (110) pour I 'ecartement des rouleaux situés dans la zone d'entrée de la machine et respectivement dans la zone de sortie en agissant de manière indépendante sur les dispositifs de réglage de l'imbrication (3) des rouleaux de chacune des zones respectivement d'entrée et de sortie. 9, characterized in that it comprises at least one electronic device (9) making it possible to control the measured spacing of the leveling rollers situated in the entry zone of the machine and respectively in the exit zone to the theoretical value given by the model (110) for the spacing of the rollers located in the entry area of the machine and respectively in the exit area by acting independently on the nesting adjustment devices (3) of the each of the entry and exit areas respectively.
11. Installation de planage à rouleaux parallèles selon la revendication11. Parallel roller leveling installation according to claim
10, caractérisée en ce que les dispositifs de réglage (3) des imbrications sont à commande hydraulique. 10, characterized in that the adjustment devices (3) of the nests are hydraulically controlled.
12. Installation de planage à rouleaux parallèles selon la revendication 6, caractérisée en ce que l'installation est pourvue d'un dispositif (6,6') permettant la mesure directe et séparée de la valeur de l'écartement de chaque paire de rouleaux actifs de planage (4,4'). 12. Parallel roller leveling installation according to claim 6, characterized in that the installation is provided with a device (6,6 ') allowing the direct and separate measurement of the value of the spacing of each pair of rollers leveling assets (4,4 ').
13. Installation de planage à rouleaux parallèles selon la revendication 12, caractérisée en ce qu'elle comporte un moyen de réglage individuel de la position de chaque rouleau de planage, et au moins un dispositif électronique (9) permettant d'asservir l'écartement mesuré de chacun des rouleaux de planage à la valeur théorique donnée par le modèle (110) pour l'écartement de chacun de ces rouleaux en agissant de manière indépendante sur leur dispositif (52) de réglage de l'imbrication. 13. Parallel roller leveling installation according to claim 12, characterized in that it comprises means for individually adjusting the position of each leveling roller, and at least one electronic device. (9) making it possible to control the measured spacing of each of the leveling rollers to the theoretical value given by the model (110) for the spacing of each of these rollers by acting independently on their adjusting device (52) of nesting.
14. Installation de planage à rouleaux parallèles selon la revendication14. parallel roller leveling installation according to claim
13, caractérisée en ce que le dispositif (52) de réglage de l'imbrication de chaque rouleau (4) est à commande hydraulique. 13, characterized in that the device (52) for adjusting the nesting of each roller (4) is hydraulically controlled.
15. Installation de planage à rouleaux parallèles selon l'une quelconque des revendications 8, 11 ou 14 caractérisée en ce que le ou les dispositifs électroniques (9) permettant d'asservir l'écartement mesuré des rouleaux de planage à la valeur théorique donnée par le modèle (110) qu'elle comporte, permet de régler un basculement latéral différentiel des rouleaux d'un côté par rapport à l'autre sur une valeur de consigne 15. Parallel roller leveling installation according to any one of claims 8, 11 or 14 characterized in that the electronic device or devices (9) making it possible to control the measured spacing of the leveling rollers to the theoretical value given by the model (110) which it comprises, makes it possible to adjust a differential lateral tilting of the rollers on one side relative to the other on a set value
EP04787476A 2003-10-13 2004-09-28 Method of increasing the control precision of the path of a product in a levelling machine with interlocking rollers, and levelling installation used to implement same Not-in-force EP1673181B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0312012A FR2860738B1 (en) 2003-10-13 2003-10-13 METHOD OF INCREASING THE ACCURACY OF PRODUCT TRACK CONTROL IN AN IMBRIC ROLL PLANER MACHINE AND PLANTING INSTALLATION FOR CARRYING OUT THE PROCESS
PCT/FR2004/002457 WO2005046899A1 (en) 2003-10-13 2004-09-28 Method of increasing the control precision of the path of a product in a levelling machine with interlocking rollers, and levelling installation used to implement same

Publications (2)

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EP1673181A1 true EP1673181A1 (en) 2006-06-28
EP1673181B1 EP1673181B1 (en) 2007-11-21

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EP04787476A Not-in-force EP1673181B1 (en) 2003-10-13 2004-09-28 Method of increasing the control precision of the path of a product in a levelling machine with interlocking rollers, and levelling installation used to implement same

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US (1) US7475581B2 (en)
EP (1) EP1673181B1 (en)
JP (1) JP2007508148A (en)
CN (1) CN100364681C (en)
BR (1) BRPI0414749B1 (en)
DE (1) DE602004010293T2 (en)
ES (1) ES2295935T3 (en)
FR (1) FR2860738B1 (en)
WO (1) WO2005046899A1 (en)

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BRPI0414749B1 (en) 2017-03-21
BRPI0414749A (en) 2006-11-21
CN100364681C (en) 2008-01-30
FR2860738A1 (en) 2005-04-15
DE602004010293T2 (en) 2008-08-21
EP1673181B1 (en) 2007-11-21
CN1856374A (en) 2006-11-01
WO2005046899A1 (en) 2005-05-26
FR2860738B1 (en) 2006-02-03
ES2295935T3 (en) 2008-04-16
US7475581B2 (en) 2009-01-13
DE602004010293D1 (en) 2008-01-03
JP2007508148A (en) 2007-04-05
US20070055393A1 (en) 2007-03-08

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