EP0041025A1 - Process and device for the rolling of metal without tension - Google Patents

Process and device for the rolling of metal without tension Download PDF

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Publication number
EP0041025A1
EP0041025A1 EP81400827A EP81400827A EP0041025A1 EP 0041025 A1 EP0041025 A1 EP 0041025A1 EP 81400827 A EP81400827 A EP 81400827A EP 81400827 A EP81400827 A EP 81400827A EP 0041025 A1 EP0041025 A1 EP 0041025A1
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EP
European Patent Office
Prior art keywords
cage
order
rolling
metal
circuit
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Granted
Application number
EP81400827A
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German (de)
French (fr)
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EP0041025B1 (en
Inventor
Jacques Fromont
Marcel Plançon
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Jeumont Schneider SA
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Jeumont Schneider SA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/48—Tension control; Compression control
    • B21B37/52—Tension control; Compression control by drive motor control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/08—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel
    • B21B1/12—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel in a continuous process, i.e. without reversing stands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/02—Speed
    • B21B2275/04—Roll speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/10—Motor power; motor current
    • B21B2275/12—Roll torque

Definitions

  • the present invention relates to the unconstrained rolling of metals and, more specifically, a method and a device for such rolling applicable to a continuous rolling train including at least two non-reversible cages whose respective drive motors are controlled by means of '' a circuit connected to a cruise control.
  • Methods are known for detecting and correcting a possible tension or compression of the metal between two successive cages, methods according to which the value of the forward or backward sliding of the metal in each cage is regulated as an essential characteristic of any stress on the metal. .
  • French patent 2,395,086 describes such a process.
  • the speed sensors which must be used are generally either imprecise, such as the tachogenerators, or expensive, such as the electronic correlators, and are practically unusable for certain measurements, because of the ambient temperature conditions.
  • this process does not take into account variations in the parasites of the rolling focus and in particular the volume flow rate of the rolled product. This results in a certain imprecision in the calculation of the slip value which is, therefore, maintained at a value such that each cage exerts a traction on the metal, it being understood that a very slight traction on the metal is entirely preferable to compression of the metal, or even at the sole risk of possible compression.
  • the object of the present invention is to obviate all of the aforementioned drawbacks.
  • FIG. 1 represents the block diagram of operation of two successive non-reversible stands of a continuous rolling train for long products, in accordance with the invention, and FIG. 2 represents more precisely the detail of one of the control units represented in FIG. 1.
  • the non-reversible continuous rolling trains generally comprise several successive stands designated here symbolically by their date, for example (n), (n + 1) in which n is an integer at least equal to 1.
  • Each cage is provided with a drive motor, respectively 4 and 5, coupled to a pulse generator 6, 7, the frequency of which is proportional to the speed of rotation of a motor to which it is coupled.
  • an electric photo cell 8, 9 for example makes it possible to detect the immediate introduction of the metal into the cage, while a strain gauge 10, 11, placed in the cage, makes it possible to generate a signal representative of the rolling effort of the corresponding cage.
  • the drive motors 4, 5 are supplied from the line 12 by means of converters 13, 14, in particular with thyristorso
  • Each control unit for example 15 associated with the order cage (n) receives at its input terminal 20 the information relating to the control unit 16 associated with the immediately higher order cage (n + 1) , and, at its input terminals 21, 22, 23, 24 and 25, the signals respectively from the photoelectric cell 9 disposed at the input of the order cage (n + 1), of the gauge constraint 10 placed in the cage 2 of order (n), of the sensor 17 of the intensity of the current flowing in the converter 13 which it controls, of the pulse generators 6, 7 coupled to the order cages (n) and (n + 1).
  • a general speed reference signal 18 of all the cages is applied to the input terminal 26 of all the control units so as to uniformly vary the rolling speed of the entire train under consideration.
  • each control unit 15 has at least two output terminals 27 and 28, one connected to the downstream control unit and the other to the converter 13 which it controls.
  • the control unit 15 of the order cage (n) is shown in more detail in FIG. 2 with the same references.
  • This control unit 15 essentially comprises, in addition to the logic 30, a speed regulator 31 the output of which is connected to a current regulator 32 itself connected to the input terminal 23 of the unit, terminal which is connected to the sensor 17.
  • the regulator 32 is connected to the output terminal 28 of the unit 15 9 itself connected to the converter 13.
  • the signal from the pulse generator 6 is applied, by the input terminal 24 of the unit 15, to a converter 33 at the output of which is generated a digital signal representative of the frequency of the pulses.
  • This output is connected, on the one hand, to the speed regulator 31, on the other hand, to a circuit for determining the rolling torque 34 which is also connected to the output of the speed regulator speed 31, and finally, to a divider circuit 35 which performs the ratio of the speeds of the order cages (n) and (n + 1), and to the other input from which the digital signal from a converter 36 is applied identical to the converter 33 but connected to the input terminal 25 of the unit 15 itself connected to the pulse generator 7 coupled to the motor 5 of the cage 3 of order (n + 1).
  • One of the outputs of the circuit 34 for determining the rolling torque is connected to one of the inputs of the speed regulator 31 by means of a loop for regulating the rolling torque of the order cage (n) .
  • This loop includes, in known manner, a first memory 37, a comparator 38 and a regulation circuit 39, operating during the first step of the method according to the invention, and a second memory 40 used during the second step of the method.
  • This torque determination circuit 34 also has an output connected to an input of a circuit 41 for developing a multiplier coefficient, another input of which is connected to the input terminal 22 of the unit 15, which even connected to the strain gauge 10 arranged in the order cage (n).
  • This processing circuit 41 is connected: to a multiplier circuit 42, to the other input from which the signal from the divider circuit 35 is applied.
  • the output of the multiplier circuit 42 is connected to one of the inputs of the speed regulator 31 by means of a loop for regulating the flow of the rolled metal operating during the third step of the process.
  • This last loop includes a memory 43, a comparator 44 and a regulator 45.
  • the speed regulator 31 has an input terminal connected to the input terminal 26 of the unit 15 to which the general speed reference signal 18 is applied.
  • the logic input terminals 30 are respectively connected to the input terminals 24, 22, 21 and 20 of the unit 15 and to an output terminal of the circuit 34 for determining the rolling torque, while its terminals outputs are connected on the one hand to the output terminal 26 of the unit 15 connected to the control unit of the order cage (n-1), and respectively to the control terminals of the memories 37 and 40 and of the circuit 39 of the torque control loop, as well as the memory control terminals 43 and regulator 45 of the flow control loop.
  • the operation of the device is as follows: the taking over of the cage 2 of order (n) is detected by the appearance of a rolling torque in the motor 4, or by means of the strain gauge 10.
  • the value of the rolling torque is determined by the circuit 34 and is recorded in the memory 37.
  • the precise moment can be determined for example, either by means of a photoelectric cell 9 disposed at the input of the cage 3 as shown in FIG. 1, or by means of a counter connected to the output of the pulse generator 6 it being understood that the distance separating the two successive cages is well known.
  • the value of the torque of rolling in the cage 2 of order (n) is kept constant by means of the regulation loop connected to the speed regulator 31 controlled in a known manner by the logic 30.
  • the correction signal from comparator 38 is recorded in the memory 40, and remains permanently applied until the end of the rolling or speed regulator 31
  • the logic 30 which has already controlled the succession of the aforementioned operations, then commands the commissioning of the flow regulation loop until the end of rolling carried out by the order cage (n). This flow regulation is obtained by applying a corrective term to the speed ratio.
  • This corrective term is a multiplying coefficient which has the form of the expression 1 + k in which k is a function, among other things, of the force of separation of the cylinders of the cage considered, of the yield coefficient of this same cage, of the radius of the cylinders and also the thickness of the slot between the cylinders, in particular at the neutral point.
  • This corrective term is developed by circuit 41 and is applied to the ratio of speeds of the cages of order (n) and (n + 1) by means of the multiplier circuit 42 o The signal from this latter circuit 42 is then processed in a loop identical to a speed control loop for cages.
  • Such a process is favorably implemented for the rolling of long products such as rails, sections, trusses, it being understood that the product is found simultaneously during rolling, engaged in several successive non-reversible cages.
  • the pulls or the compression of the product between two successive cages causes deformations in the desired profile of the finished product and the method according to the invention makes it possible to avoid such drawbacks.

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

Abstract

Le procédé selon l'invention comprend une première étape, juste avant l'introduction du métal dans la cage 3 d'ordre (n+1) au cours de laquelle la valeur du couple de laminage de la cage d'ordre (n) est déterminée et enregistrée, puis une deuxième étape se poursuivant jusqu'au moment précédent l'introduction du métal dans la cage d'ordre (n+2), au cours de laquelle la valeur du couple de laminage de la cage d'ordre (n) est maintenue constante, et une troisième étape se poursuivant jusqu'à la fin de l'opération de laminage de la cage d'ordre (n), au cours de laquelle le débit volumique du métal est maintenu constant au droit de chaque cage. Application aux trains de laminage incluant au moins deux cages non réversibles pour produits longs.The method according to the invention comprises a first step, just before the metal is introduced into the order cage 3 (n + 1) during which the value of the rolling torque of the order cage (n) is determined and recorded, then a second step continuing until the moment preceding the introduction of the metal into the order cage (n + 2), during which the value of the rolling torque of the order cage (n ) is kept constant, and a third step continues until the end of the rolling operation of the order cage (n), during which the metal volume flow is kept constant at the right of each cage. Application to rolling trains including at least two non-reversible cages for long products.

Description

La présente invention concerne le laminage sans contrainte de métaux et, plus précisément, un procédé et un dispositif pour un tel laminage applicable à un train de laminage continu incluant au moins deux cages non réversibles dont les moteurs d'entraînement respectifs sont commandés au moyen d'un circuit connecté à un régulateur de vitesse. On connaît des procédés permettant de détecter et de corriger une éventuelle tension ou compression du métal entre deux cages successives, procédés selon lesquels la valeur du glissement avant ou arrière du métal dans chaque cage est régulée en tant que caractéristique essentielle de toute contrainte sur le métal. Par exemple, le brevet français 2 395 086 décrit un tel procédé.The present invention relates to the unconstrained rolling of metals and, more specifically, a method and a device for such rolling applicable to a continuous rolling train including at least two non-reversible cages whose respective drive motors are controlled by means of '' a circuit connected to a cruise control. Methods are known for detecting and correcting a possible tension or compression of the metal between two successive cages, methods according to which the value of the forward or backward sliding of the metal in each cage is regulated as an essential characteristic of any stress on the metal. . For example, French patent 2,395,086 describes such a process.

D'une part, les capteurs de vitesse qui doivent être utilisés sont généralement soit imprécis, tels les générateurs tachymétriques, soit onéreux, tels les corrélateurs électroniques, et sont pratiquement inutilisables pour certaines mesures, du fait des conditions ambiantes de température. D'autre part, ce procédé ne tient pas compte des variations des parasites du foyer de laminage et en particulier du débit volumique du produit laminé. Il en résulte une certaine imprécision du calcul de la valeur du glissement qui est, de ce fait, maintenue à une valeur telle que chaque cage exerce une traction du métal, étant entendu qu'une très légère traction du métal est tout à fait préférable à une compression du métal, voire même au seul risque d'une éventuelle compression.On the one hand, the speed sensors which must be used are generally either imprecise, such as the tachogenerators, or expensive, such as the electronic correlators, and are practically unusable for certain measurements, because of the ambient temperature conditions. On the other hand, this process does not take into account variations in the parasites of the rolling focus and in particular the volume flow rate of the rolled product. This results in a certain imprecision in the calculation of the slip value which is, therefore, maintained at a value such that each cage exerts a traction on the metal, it being understood that a very slight traction on the metal is entirely preferable to compression of the metal, or even at the sole risk of possible compression.

Un procédé qui fait l'objet du brevet français 2 354 154, a été développé pour obvier à ces inconvénients bien connus. Selon ce procédé, juste avant l'introduction du métal dans la deuxième cage, la valeur du couple de laminage de la première cage est déterminée et enregistrée, puis dès l'introduction du métal dans la deuxième cage, la valeur du couple de laminage de la première cage est maintenue constante par action sur la référence de vitesse du régulateur de vitesse de la première cage, jusqu'à stabilisation de la vitesse de cette première cage, et immédiatement après et jusqu'à la fin du laminage, le rapport des vitesses des deux cages est maintenu constant par action sur la référence principale du régulateur de couple de la première cage. Toutefois, ce dernier procédé ne tient pas compte des éventuelles variations de la section du métal dont il peut résulter des forces de traction ou de compression non négli- gables.A process which is the subject of French patent 2,354,154 has been developed to overcome these well known drawbacks. According to this process, just before the introduction of the metal into the second stand, the value of the rolling torque of the first stand is determined and recorded, then from the intro duction of the metal in the second stand, the value of the rolling torque of the first stand is kept constant by acting on the speed reference of the speed regulator of the first stand, until the speed of this first stand is stabilized, and immediately after and until the end of rolling, the speed ratio of the two stands is kept constant by acting on the main reference of the torque regulator of the first stand. However, this latter method does not take account of any variations in the cross-section of the metal, from which considerable traction or compression forces may result.

La présente invention a pour but d'obvier à l'ensemble des inconvénients précités.The object of the present invention is to obviate all of the aforementioned drawbacks.

Le procédé selon l'invention, comprend trois étapes essentielles :

  • Au cours de la première, juste avant l'introduction du métal dans la cage d'ordre (n+l), la valeur du couple de laminage dans la cage d'ordre (n) est déterminée et enregistrée, puis dans une deuxième étape, dès l'introduction du métal dans la cage d'ordre (n+1), la valeur du couple de laminage dans la cage d'ordre (n) est maintenue constante par action sur le régulateur de vitesse de la cage d'ordre (n) jusqu'au moment précédant l'introduction du métal dans la cage d'ordre (n+2), puis, dans une troisième étape, se poursuivant jusqu'à la fin de l'opération de laminage de la cage d'ordre (n), le débit volumique du métal est maintenu constant au droit de chaque cage, notamment par application d'un coefficient multiplicateur au signal représentatif du rapport des vitesses de deux cages successives.
The method according to the invention comprises three essential steps:
  • During the first, just before the introduction of the metal into the order cage (n + l), the value of the rolling torque in the order cage (n) is determined and recorded, then in a second step , as soon as the metal is introduced into the order cage (n + 1), the value of the rolling torque in the order cage (n) is kept constant by action on the speed controller of the order cage (n) until the moment preceding the introduction of the metal into the order cage (n + 2), then, in a third step, continuing until the end of the rolling operation of the order cage order (n), the metal volume flow is kept constant at the level of each cage, in particular by applying a multiplying coefficient to the signal representative of the speed ratio of two successive cages.

L'invention sera mieux comprise et d'autres buts, avantages et caractéristiques apparaîtront plus clairement à la lecture de la description qui suit d'un mode de réalisation donné à titre non limitatif, description à laquelle deux planches de dessins sont annexées.The invention will be better understood and other objects, advantages and characteristics will appear more clearly on reading the following description of an embodiment given without limitation, description to which two drawing sheets are appended.

La figure 1 représente le schéma synoptique de fonctionnement de deux cages successives non réversibles d'un train de laminage continu pour produitslongs, conformément à l'invention, et la figure 2 représente plus précisément le détail de l'une des unités de commande représentées figure 1.FIG. 1 represents the block diagram of operation of two successive non-reversible stands of a continuous rolling train for long products, in accordance with the invention, and FIG. 2 represents more precisely the detail of one of the control units represented in FIG. 1.

En référence maintenant à 7a figure 1, le métal 1 est introduit entre les cylindres de la cage 2 de laminage d'ordre (n) avant d'être introduit dans la cage 3 d'ordre (n+1). Les trains de laminage continu non réversibles comprennent généralement plusieurs cages successives désignées ici symboliquement par leur quantième, par exemple (n), (n+1) dans lesquels n est un nombre entier au moins égal à 1.Referring now to FIG. 7a, the metal 1 is introduced between the cylinders of the order 2 rolling cage (n) before being introduced into the order 3 order (n + 1). The non-reversible continuous rolling trains generally comprise several successive stands designated here symbolically by their date, for example (n), (n + 1) in which n is an integer at least equal to 1.

Chaque cage est pourvue d'un moteur d'entraînement, respectivement 4 et 5, couplé à un générateur d'impulsions 6, 7, dont la fréquence est proportionnelle à la vitesse de rotation d'un moteur auquel il est couplé.Each cage is provided with a drive motor, respectively 4 and 5, coupled to a pulse generator 6, 7, the frequency of which is proportional to the speed of rotation of a motor to which it is coupled.

Devant chaque cage, une cellule photo électrique 8, 9 par exemple permet de détecter l'introduction immédiate du métal dans la cage, tandis qu'une jauge de contrainte 10, 11, disposée dans la cage, permet d'engendrer un signal représentatif de l'effort de laminage de la cage correspondante.In front of each cage, an electric photo cell 8, 9 for example makes it possible to detect the immediate introduction of the metal into the cage, while a strain gauge 10, 11, placed in the cage, makes it possible to generate a signal representative of the rolling effort of the corresponding cage.

Les moteurs d'entraînement 4, 5 sont alimentés à partir de la ligne secteur 12 au moyen de convertisseurs 13, 14, notamment à thyristorsoThe drive motors 4, 5 are supplied from the line 12 by means of converters 13, 14, in particular with thyristorso

Ces convertisseurs sont commandés respectivement par une unité de commande 15, 16 dont le schéma sera étudié plus en détail au moyen de la figure 2.These converters are controlled respectively by a control unit 15, 16 whose diagram will be studied in more detail by means of FIG. 2.

Chaque unité de commande par exemple 15 associée à la cage d'ordre (n), reçoit à sa borne d'entrée 20 les informations relatives à l'unité de commande 16 associée à la cage d 'ordre immédiatement supérieure(n+l), et, à ses bornes d'entrée 21, 22, 23, 24 et 25, les signaux issus respectivement de la cellule photo électrique 9 disposée à l'entrée de la cage d'ordre (n+1), de la jauge de contrainte 10 disposée dans la cage 2 d'ordre (n), du capteur 17 de l'intensité du courant circulant dans le convertisseur 13 qu'elle commande, des générateurs d'impulsions 6, 7 couplés aux cages d'ordres (n) et (n+1). De plus, un signal 18 de référence générale de vitesse de toutes les cages est appliqué à la borne d'entrée 26 de toutes les unités de commande de manière à faire varier uniformément la vitesse de laminage de l'ensemble du train considéré.Each control unit for example 15 associated with the order cage (n), receives at its input terminal 20 the information relating to the control unit 16 associated with the immediately higher order cage (n + 1) , and, at its input terminals 21, 22, 23, 24 and 25, the signals respectively from the photoelectric cell 9 disposed at the input of the order cage (n + 1), of the gauge constraint 10 placed in the cage 2 of order (n), of the sensor 17 of the intensity of the current flowing in the converter 13 which it controls, of the pulse generators 6, 7 coupled to the order cages (n) and (n + 1). In addition, a general speed reference signal 18 of all the cages is applied to the input terminal 26 of all the control units so as to uniformly vary the rolling speed of the entire train under consideration.

Enfin, chaque unité de commande 15 a au moins deux bornes de sortie 27 et 28, l'une connectée à l'unité de commande aval et l'autre au convertisseur 13 qu'elle commande. L'unité de commande 15 de la cage d'ordre (n) est représentée plus en détail figure 2 avec les mêmes références.Finally, each control unit 15 has at least two output terminals 27 and 28, one connected to the downstream control unit and the other to the converter 13 which it controls. The control unit 15 of the order cage (n) is shown in more detail in FIG. 2 with the same references.

Cette unité de commande 15 comprend essentiellement, outre la logique 30, un régulateur de vitesse 31 dont la sortie est reliée à un régulateur de courant 32 lui-même connecté à la borne d'entrée 23 de l'unité, borne qui est reliée au capteur 17. Le régulateur 32 est connecté à la borne de sortie 28 de l'unité 159 elle-même reliée au convertisseur 13. Le signal issu du générateur d'impulsions 6 est appliqué, par la borne d'entrée 24 de l'unité 15, à un convertisseur 33 à la sortie duquel est engendré un signal numérique représentatif de la fréquence des impulsions. Cette sortie est connectée, d'une part, au régulateur de vitesse 31, d'autre part, à un circuit de détermination du couple de laminage 34 qui est également connecté à la sortie du régulateur de vitesse 31, et enfin, à un circuit diviseur 35 qui effectue le rapport des vitesses des cages d'ordres (n) et (n+1), et à l'autre entrée duquel est appliqué le signal numérique issu d'un convertisseur 36 identique au convertisseur 33 mais connecté à la borne d'entrée 25 de l'unité 15 elle-même reliée au générateur d'impulsions 7 couplé au moteur 5 de la cage 3 d'ordre (n+1).This control unit 15 essentially comprises, in addition to the logic 30, a speed regulator 31 the output of which is connected to a current regulator 32 itself connected to the input terminal 23 of the unit, terminal which is connected to the sensor 17. The regulator 32 is connected to the output terminal 28 of the unit 15 9 itself connected to the converter 13. The signal from the pulse generator 6 is applied, by the input terminal 24 of the unit 15, to a converter 33 at the output of which is generated a digital signal representative of the frequency of the pulses. This output is connected, on the one hand, to the speed regulator 31, on the other hand, to a circuit for determining the rolling torque 34 which is also connected to the output of the speed regulator speed 31, and finally, to a divider circuit 35 which performs the ratio of the speeds of the order cages (n) and (n + 1), and to the other input from which the digital signal from a converter 36 is applied identical to the converter 33 but connected to the input terminal 25 of the unit 15 itself connected to the pulse generator 7 coupled to the motor 5 of the cage 3 of order (n + 1).

L'une des sorties du circuit 34 de détermination du couple de laminage est connectée à l'une des entrées du régulateur de vitesse 31 par l'intermédiaire d'une boucle de régulation du couple de laminage de la cage d'ordre (n). Cette boucle inclut, de manière connue, une première mémoire 37, un comparateur 38 et un circuit 39 de régulation, fonctionnant pendant la première étape du procédé selon l'invention, et une deuxième mémoire 40 utilisée lors de la deuxième étape du procédé. Ce circuit 34 de détermination du couple a également une sortie reliée à une entrée d'un circuit 41 d'élaboration d'un coefficient multiplicateur, dont une autre entrée est connectée à la borne d'entrée 22 de l'unité 15, elle-même reliée à la jauge de contrainte 10 disposée dans la cage d'ordre (n).One of the outputs of the circuit 34 for determining the rolling torque is connected to one of the inputs of the speed regulator 31 by means of a loop for regulating the rolling torque of the order cage (n) . This loop includes, in known manner, a first memory 37, a comparator 38 and a regulation circuit 39, operating during the first step of the method according to the invention, and a second memory 40 used during the second step of the method. This torque determination circuit 34 also has an output connected to an input of a circuit 41 for developing a multiplier coefficient, another input of which is connected to the input terminal 22 of the unit 15, which even connected to the strain gauge 10 arranged in the order cage (n).

Ce circuit 41 d'élaboration est relié:à un circuit multiplicateur 42, à l'autre entrée duquel est appliqué le signal issu du circuit diviseur 35.This processing circuit 41 is connected: to a multiplier circuit 42, to the other input from which the signal from the divider circuit 35 is applied.

La sortie du circuit multiplicateur 42 est connectée à l'une des entrées du régulateur de vitesse 31 par l'intermédiaire d'une boucle de régulation du débit du métal laminé fonctionnant au cours de la troisième étape du procédé. Cette dernière boucle inclut une mémoire 43, un comparateur 44 et un régulateur 45.The output of the multiplier circuit 42 is connected to one of the inputs of the speed regulator 31 by means of a loop for regulating the flow of the rolled metal operating during the third step of the process. This last loop includes a memory 43, a comparator 44 and a regulator 45.

Enfin le régulateur de vitesse 31 a une borne d'entrée reliée à la borne d'entrée 26 de l'unité 15 à laquelle est appliqué le signal de référence générale de vitesse 18.Finally, the speed regulator 31 has an input terminal connected to the input terminal 26 of the unit 15 to which the general speed reference signal 18 is applied.

Les bornes d'entrée de la logique 30 sont respectivement connectées aux bornes d'entrée 24, 22, 21 et 20 de l'unité 15 et à une borne de sortie du circuit 34 de détermination du couple de laminage, tandis que ses bornes de sortie sont connectées d'une part à la borne de sortie 26 de l'unité 15 reliée à l'unité de commande de la cage d'ordre (n-1), et respectivement aux bornes de commande des mémoires 37 et 40 et du circuit 39 de la boucle de régulation du couple, ainsi qu'aux bornes de commande de la mémoire 43 et du régulateur 45 de la boucle de régulation du débit.The logic input terminals 30 are respectively connected to the input terminals 24, 22, 21 and 20 of the unit 15 and to an output terminal of the circuit 34 for determining the rolling torque, while its terminals outputs are connected on the one hand to the output terminal 26 of the unit 15 connected to the control unit of the order cage (n-1), and respectively to the control terminals of the memories 37 and 40 and of the circuit 39 of the torque control loop, as well as the memory control terminals 43 and regulator 45 of the flow control loop.

Le fonctionnement du dispositif est le suivant : la prise en charge de la cage 2 d'ordre (n) est détectée par l'apparition d'un couple de laminage dans le moteur 4, ou bien au moyen de la jauge de contrainte 10.The operation of the device is as follows: the taking over of the cage 2 of order (n) is detected by the appearance of a rolling torque in the motor 4, or by means of the strain gauge 10.

Juste avant l'introduction du métal 1 dans la cage 3 d'ordre (n+1), la valeur du couple de laminage, qui est alors effectué sans contrainte, est déterminée par le circuit 34 et est enregistrée dans la mémoire 37. Le moment précis peut être déterminé par exemple, soit au moyen d'une cellule photo-électrique 9 disposée à l'entrée de la cage 3 comme représenté figure 1, soit au moyen d'un compteur connecté à la sortie du générateur d'impulsions 6 étant entendu que la distance séparant les deux cages successives est bien connue.Just before the introduction of the metal 1 into the cage 3 of order (n + 1), the value of the rolling torque, which is then carried out without constraint, is determined by the circuit 34 and is recorded in the memory 37. The precise moment can be determined for example, either by means of a photoelectric cell 9 disposed at the input of the cage 3 as shown in FIG. 1, or by means of a counter connected to the output of the pulse generator 6 it being understood that the distance separating the two successive cages is well known.

Lors de l'introduction du métal 1 dans la cage 3 d'ordre (n+1) détectée au moyen de la jauge de contrainte 11 ou de l'apparition d'un couple de laminage dans le moteur 5, la valeur du couple de laminage dans la cage 2 d'ordre (n) est maintenue constante au moyen de la boucle de régulation connectée au régulateur de vitesse 31 commandée de manière connue par la logique 30. Juste avant l'introduction du métal dans la cage non représentée d'ordre (n+2), le signal de correction issu du comparateur 38 est enregistré dans la mémoire 40, et reste appliqué en permanence jusqu'à la fin du laminage ou régulateur de vitesse 31 La logique 30 qui a déjà commandé la succession des opérations précitées, commande alors la mise en service de la boucle de régulation de débit jusqu'à la fin du laminage effectué par la cage d'ordre (n). Cette régulation du débit est obtenue en appliquant un terme correctif au rapport des vitesses. Ce terme correctif est un coefficient multiplicateur qui a la forme de l'expression 1 + k dans laquelle k est fonction, entre autres, de l'effort de séparation des cylindres de la cage considérée, du coefficient de cédage de cette même cage, du rayon des cylindres et également de l'épaisseur de la fente entre les cylindres notamment au point neutre. Ce terme correctif est élaboré par le circuit 41 et est appliqué au rapport desvitesses des cages d'ordre (n) et (n+1) au moyen du circuit multiplicateur 42o Le signal issu de ce dernier circuit 42 est alors traité dans une boucle identique à une boucle de régulation de vitesse des cages.During the introduction of the metal 1 into the cage 3 of order (n + 1) detected by means of the strain gauge 11 or the appearance of a rolling torque in the motor 5, the value of the torque of rolling in the cage 2 of order (n) is kept constant by means of the regulation loop connected to the speed regulator 31 controlled in a known manner by the logic 30. Just before the introduction of the metal into the cage not shown order (n + 2), the correction signal from comparator 38 is recorded in the memory 40, and remains permanently applied until the end of the rolling or speed regulator 31 The logic 30 which has already controlled the succession of the aforementioned operations, then commands the commissioning of the flow regulation loop until the end of rolling carried out by the order cage (n). This flow regulation is obtained by applying a corrective term to the speed ratio. This corrective term is a multiplying coefficient which has the form of the expression 1 + k in which k is a function, among other things, of the force of separation of the cylinders of the cage considered, of the yield coefficient of this same cage, of the radius of the cylinders and also the thickness of the slot between the cylinders, in particular at the neutral point. This corrective term is developed by circuit 41 and is applied to the ratio of speeds of the cages of order (n) and (n + 1) by means of the multiplier circuit 42 o The signal from this latter circuit 42 is then processed in a loop identical to a speed control loop for cages.

Un tel procédé est favorablement mis en oeuvre pour le laminage de produits longs tels des rails, des profilés, despou- trelles, étant entendu que le produit se trouve simultanément au cours du laminage, en prise dans plusieurs cages successives non réversibles. Dans ce cas, les tractions ou la compression du produit entre deux cages successives provoque des déformations dans le profil recherché du produit fini et le procédé selon l'invention permet d'éviter de tels inconvénients.Such a process is favorably implemented for the rolling of long products such as rails, sections, trusses, it being understood that the product is found simultaneously during rolling, engaged in several successive non-reversible cages. In this case, the pulls or the compression of the product between two successive cages causes deformations in the desired profile of the finished product and the method according to the invention makes it possible to avoid such drawbacks.

Bien que seul un mode de réalisation du procédé ait été décrit, il est évident que toute modification apportée par l'Homme de l'Art dans le même esprit ne sortirait pas du cadre de la présente invention.Although only one embodiment of the method has been described, it is obvious that any modification made by a person skilled in the art in the same spirit would not depart from the scope of the present invention.

Claims (4)

1- Procédé pour le laminage sans contrainte de métaux applicable à au moins deux cages successives non réversibles d'un train de laminage continu comprenant, pour chaque cage, un régulateur de couple et un régulateur de vitesse agissant respectivement sur un circuit de commande du moteur d'entraînement des dites cages, et comprenant une première étape, juste avant l'introduction du métal dans la cage d'ordre (n+1) au cours de laquelle la valeur du couple de laminage de laçage d'ordre(n) est déterminée et enregistrée, puis une deuxième étape, commençant dès l'introduction du métal dans la cage d'ordre (n+1), au cours de laquelle la valeur du couple de laminage de la cage d'ordre (n) est maintenue constante en agissant sur le régulateur de vitesse de la cage d'ordre (n), caractérisé en ce que la dite deuxième étape se poursuit jusqu'au moment précédant l'introduction du dit métal dans la cage d'ordre (n+2) et est suivie d'une troisième étape se poursuivant jusqu'à la fin de l'opération de laminage de la cage d'ordre (n), au cours de laquelle le débit volumique du dit métal est maintenu constant au droit de chaque cage.1- Method for the unconstrained rolling of metals applicable to at least two successive non-reversible stands of a continuous rolling train comprising, for each stand, a torque regulator and a speed regulator acting respectively on a motor control circuit of driving said cages, and comprising a first step, just before the introduction of the metal into the order cage (n + 1) during which the value of the order lacing rolling torque (n) is determined and recorded, then a second step, starting from the introduction of the metal into the order cage (n + 1), during which the value of the rolling torque of the order cage (n) is kept constant by acting on the speed regulator of the order cage (n), characterized in that said second stage continues until the moment preceding the introduction of said metal into the order cage (n + 2) and is followed by a third step continuing until the end of operation d e rolling of the order cage (n), during which the volume flow rate of said metal is kept constant at the right of each cage. 2- Procédé selon la revendication 1 caractérisé en ce que le dit débit volumique est maintenu constant par application d'un coefficient multiplicateur variable au signal représentatif du rapport des vitesses des cages d'ordres (n) et (n+1).2- A method according to claim 1 characterized in that said volume flow rate is kept constant by applying a variable multiplying coefficient to the signal representative of the ratio of the speeds of the order cages (n) and (n + 1). 3- Dispositif pour la mise en oeuvre du procédé selon l'une quelconque des revendications 1 et 2 caractérisé en ce que l'unité de commande (15) du convertisseur (13) d'alimentation du moteur (4) d'entraînement des cylindres de la cage (2) d'ordre (n) comprend notamment un circuit (34) de détermination de la valeur du couple de laminage de la cage d'ordre (n), un circuit diviseur (35) engendrant un signal représentatif du rapport des vitesses de la cage d'ordre (n) et de la cage d'ordre (n+l) et un régulateur de vitesse (31) du moteur de la cage d'ordre (n), le dit circuit 34 de détermination du couple de laminage ayant l'une de ses bornes de sortie reliée au dit régulateur de vitesse (31) par l'intermédiaire d'une boucle de régulation du couple, et une autre borne de sortie reliée à un circuit (41) d'élaboration du dit coefficient multiplicateur dont une autre borne d'entrée est reliée à une jauge de contrainte (10) disposée dans la dite cage d'ordre (n), le dit circuit diviseur (35) étant relié à un circuit multiplicateur (42) auquel est également appliqué le signal issu du dit circuit (41) d'élaboration du dit coefficient multiplicateur et dont la sortie est reliée au dit régulateur de vitesse (31) au moyen d'une boucle de régulation agissant alors sur un signal représentatif du débit volumique du métal dans la dite cage d'ordre (n).3- Device for implementing the method according to any one of claims 1 and 2 characterized in that the control unit (15) of the converter (13) supplying the engine (4) driving the cylinders of the order cage (2) (n) comprises in particular a circuit (34) for determining the value of the rolling torque of the order cage (n), a divider circuit (35) generating a signal representative of the ratio speeds of the order cage (n) and of the order cage (n + l) and a speed regulator (31) of the motor of the order cage (n), the said circuit 34 of deter mination of the rolling torque having one of its output terminals connected to said speed regulator (31) via a torque regulation loop, and another output terminal connected to a circuit (41) d elaboration of said multiplier coefficient of which another input terminal is connected to a strain gauge (10) arranged in said order cage (n), said divider circuit (35) being connected to a multiplier circuit (42 ) to which is also applied the signal from said circuit (41) for developing said multiplying coefficient and the output of which is connected to said speed regulator (31) by means of a regulation loop then acting on a signal representative of the metal volume flow in said order cage (n). 4- Dispositif selon la revendication 3 caractérisé en ce que deux générateurs (6,7) d'impulsions respectivement couplés aux moteurs (4,5) d'entraînement des dites cages d'ordres (n) et (n+1) sont reliés aux bornes d'entrée du_dit circuit diviseur (35) déterminant le rapport des vitesses des dites cages par l'intermédiaire de deux convertisseurs (33,36) à la sortie desquels est engendré un signal numérique représentatif de la fréquence des impulsions engendrées par les dits générateurs (6,7).4- Device according to claim 3 characterized in that two pulse generators (6,7) respectively coupled to the motors (4,5) for driving said order cages (n) and (n + 1) are connected at the input terminals of the said divider circuit (35) determining the speed ratio of said cages by means of two converters (33, 36) at the output of which is generated a digital signal representative of the frequency of the pulses generated by said generators (6,7).
EP81400827A 1980-05-28 1981-05-25 Process and device for the rolling of metal without tension Expired EP0041025B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8011796A FR2483268A1 (en) 1980-05-28 1980-05-28 METHOD AND DEVICE FOR THE ROLLING WITHOUT CCONTRAINTE OF METALS
FR8011796 1980-05-28

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EP0041025A1 true EP0041025A1 (en) 1981-12-02
EP0041025B1 EP0041025B1 (en) 1985-01-09

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EP81400827A Expired EP0041025B1 (en) 1980-05-28 1981-05-25 Process and device for the rolling of metal without tension

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US (1) US4408470A (en)
EP (1) EP0041025B1 (en)
JP (1) JPS5736007A (en)
DE (1) DE3168119D1 (en)
FR (1) FR2483268A1 (en)

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EP0290834A1 (en) * 1987-05-15 1988-11-17 DANIELI & C. OFFICINE MECCANICHE S.p.A. Method for regulating the pull in continuous rolling trains and rolling train which adopts said method
EP0698572A1 (en) * 1994-08-27 1996-02-28 Licentia Patent-Verwaltungs-GmbH Method for the control of web velocities in a device for the transport or the drawing of a web material

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US5101650A (en) * 1990-05-01 1992-04-07 Allegheny Ludlum Corporation Tandem mill feed forward gage control with speed ratio error compensation
WO1995011097A2 (en) * 1993-10-18 1995-04-27 Vandenbroucke Jack Eric Quick automated tool changer roll forming apparatus
EP0876227B1 (en) * 1996-01-23 2003-04-09 Siemens Aktiengesellschaft System and method for rolling slabs
US5806357A (en) * 1996-01-23 1998-09-15 Siemens Aktiengesellschaft System and method for rolling tapered slabs
FR2788233B1 (en) * 1999-01-11 2001-02-23 Alstom METHOD OF CONTROLLING TRACTIONS / COMPRESSIONS IN A HOT MULTICAGE ROLLER AND CONTROL SYSTEM THEREOF
RU2198753C1 (en) * 2002-03-22 2003-02-20 Общество с ограниченной ответственностью "СЛОТ" Method for setting speed mode of continuous group of rolling stands of hot rolling mill at providing minimum tension between stands
US10363590B2 (en) 2015-03-19 2019-07-30 Machine Concepts, Inc. Shape correction leveler drive systems
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Also Published As

Publication number Publication date
JPS5736007A (en) 1982-02-26
FR2483268A1 (en) 1981-12-04
FR2483268B1 (en) 1984-01-27
DE3168119D1 (en) 1985-02-21
EP0041025B1 (en) 1985-01-09
US4408470A (en) 1983-10-11

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