EP0147258A1 - Method of changing the width of a continuously cast strand without interrupting the casting - Google Patents

Method of changing the width of a continuously cast strand without interrupting the casting Download PDF

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Publication number
EP0147258A1
EP0147258A1 EP84402211A EP84402211A EP0147258A1 EP 0147258 A1 EP0147258 A1 EP 0147258A1 EP 84402211 A EP84402211 A EP 84402211A EP 84402211 A EP84402211 A EP 84402211A EP 0147258 A1 EP0147258 A1 EP 0147258A1
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EP
European Patent Office
Prior art keywords
short side
width
length
mold
during
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Granted
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EP84402211A
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German (de)
French (fr)
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EP0147258B1 (en
Inventor
Alain Chielens
René Durinck
Pierre Werquin
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Fives Cail Babcock SA
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Fives Cail Babcock SA
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Priority to AT84402211T priority Critical patent/ATE32844T1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/168—Controlling or regulating processes or operations for adjusting the mould size or mould taper

Definitions

  • the subject of the present invention is a method for modifying the width of a continuous casting product with rectangular section, such as a slab, without interrupting the casting, by displacement of at least one small side of the mold.
  • the speed of movement of the short side (s) is predetermined for the entire duration of the movement, so that the length of the variable-width section of the cast product, called the transition section, depends the speed of extraction of the cast product. It is not possible to obtain a transition section of predetermined length if the extraction speed accidentally varies during the change of width. However, to reduce losses and facilitate rolling operations, it is very important to be able to impose a given length on the transition section.
  • the object of the present invention is to provide a method for changing the width of a continuous casting product, without interrupting the casting, making it possible to produce a transition section of imposed length whatever the evolution of the speed of extraction of the cast product during the change of width.
  • the process which is the subject of the present invention is characterized in that the movements of the short side are controlled as a function of the length of the cast product from the start of the change in width so that the transition section of the cast product has a predetermined length which that is the evolution of the speed of extraction of the cast product during the change of width.
  • the relationship between the abscissa of any point on the small side of the mold, in particular the attachment points of the screw jacks used to move the short side, and the length of the cast product can be a polynomial. In particular, it could be a linear relation.
  • the intermediate phase could be a rotation around an axis coincident with the intersection of the planes defined by the inner face of the short side when the latter is in its initial and final positions, respectively, or an axis coincident with the intersection of the planes defined by the inner face of the short side when the latter is in the intermediate positions making the angle p with its initial and final positions, respectively, or of an axis parallel to these axes and located in the vicinity of these.
  • the continuous casting ingot molds used for the production of slabs consist of a frame 10 in the form of a frame supporting four plates forming the sides of the ingot mold.
  • the plates 12 constituting the short sides are normally clamped between the plates 14 constituting the long sides by pressure means, such as jacks or springs. When these means are made inactive, the short sides can be moved to adjust the width of the mold cavity and, consequently, of the slabs produced.
  • Figure 2 there is shown schematically the successive positions of a small side of the mold which is moved away from the axis XX 'of the cavity of the mold, to widen the latter.
  • the axis X'-X represents the trace on the plane of the figure, that is to say on the median plane parallel to the large faces of the mold, of the plane containing the axis of the laotière's cavity.
  • the axis XX ′ it will be, if appropriate, the plane containing this axis.
  • the line AA 3 represents the lower edge of the mold and the line BB 3 the level of the free surface of the metal in the mold.
  • the short side is in the AE position; it is inclined at an angle ⁇ 1 , relative to the axis XX ′, to take account of the contraction of the cast product due to its cooling in the mold; this inclination makes it possible to maintain the short side of the mold in contact with the small faces of the product poured practically over the entire height of the mold and, consequently, to reduce the risks of breakthroughs. It has been demonstrated and verified by experience that this inclination is such that the extension of the trace on the short side always passes through a fixed point 0, called the center of conicity, for all the widths of the cast product that we are able to produce industrially.
  • the short side is brought, by rotation around an axis 0 1 located below the lingo third, from the initial position AB to position A 1 B 1 such that its plane forms with the plane perpendicular to the plane of the figure and the trace of which on it is B 1 0 an angle ⁇ whose tangent is equal to the slope of the small faces of the transition section of the cast product (see Figure 3).
  • This angle depends on the length of the transition section and the variation in width that has been imposed.
  • the position of the axis of rotation O 1 is chosen so as to limit to an acceptable value, for example 1 mm, the clearance between the short side and the small face of the cast product and / or the compression of the latter by the short side. , over the entire height of the mold.
  • the short side is rotated around an axis perpendicular to the plane of the figure and passing through 0 to bring it into position A 2 B 2 .
  • This axis is in fact the intersection of all the planes defined by the inner face of the short side when it is in the normal casting position, for different widths of the mold.
  • the short side is rotated around an axis 0 2 , located at the level of the free surface of the metal in the ingot mold or in the vicinity thereof, to bring it into the chosen position A 3 B 3 .
  • the short side is inclined at an angle ⁇ 2 relative to the axis X'X and the plane of its interior face contains the center O.
  • the position of the axis O 2 is chosen to limit the clearance between the short side and the small face of the cast product and / or the compression of the latter to an acceptable value.
  • the short side is moved according to the length of the cast product.
  • the movements of the short side are controlled by the jacks 16, the running of which is controlled by the automaton or the computer 20 which imposes on them laws of linear displacement, the displacements of the two jacks remaining during each phase in a constant ratio which depends on the position chosen for the axis of rotation.
  • the length of the cast product is continuously measured, for example by means of a roller 22 applied to one face of the cast product and associated with an encoder which delivers pulses whose number is proportional to the number of turns of the roller and, therefore, the length of the cast product.
  • the operator introduces in the controller 20 the values imposed for the variation in width and length of the transition section. From these values, which make it possible to define the angle ⁇ , the automaton selects from a file the values of the parameters a l , b - possibly a ' 1 , b' 1 , a " 1 , b" 1 ... - a 2 , b2 , a 3 and b 3 - possibly to ' 3 , b' 3 , a " 3 , b" 3 ...
  • the computer or automaton which is equipped with a computer center, calculates from the moment the order to change the width is given, and at regular and very short time intervals, for example five seconds, the displacements to be imposed on the two jacks 16 during the time interval which follows the instant considered.
  • the automaton calculates the abscissae of a reference point of each of the screws which correspond to the position which the short side will have to reach at time t n + 1 .
  • the automaton will calculate, at time t n + 1 , the corrected abscissa, from the real length of the product poured up to this instant, then the differences between the real abscissa and the corrected abscissa and will correct in consequence the new abscissa calculated for the moment t n + 2 .
  • the rotation of the short side can take place around an axis 0 'coinciding with the intersection of the planes defined by the inner face of the short side when it is in positions A 1 B 1 and A 2 B 2 , respectively, or around an axis near 0 or O '.
  • the operation is carried out in the same way by tilting, at the start of the operation, the short side towards the inside of the mold with an angle e equal to l 'angle of inclination of the small faces of the transition section of the cast product, then by rotating it around an axis defined as in the previous case and passing through 0 or 0' or close to them and finally by straightening the short side by rotation about an axis 0 2 located near the level of the free surface of the liquid metal in the mold.
  • the two short sides of the ingot mold will be displaced simultaneously and symmetrically with respect to the axis X'X of the ingot mold.

Abstract

A method of changing the width of a continuous metal casting of rectangular cross section without interrupting the casting, wherein a length of the continuous casting is cast through a mold defining a cavity of rectangular cross section having a longitudinal axis, the mold having two small side walls determining therebetween the width of the continuous casting, at least one of the side walls being displaceable with respect to the longitudinal axis to change the width, which comprises the improvement of so controlling the displacement of the one side wall in response to the length of the continuous casting cast since the beginning of the width changing operation that a transition zone of changing width of the continuous casting has a predetermined length regardless of any change in the casting speed of the continuous casting during said operation.

Description

La présente invention a pour objet un procédé pour modifier la largeur d'un produit de coulée continue à section rectangulaire, tel qu'une brame, sans interrompre la coulée, par déplacement d'au moins un petit côté de la lingotière.The subject of the present invention is a method for modifying the width of a continuous casting product with rectangular section, such as a slab, without interrupting the casting, by displacement of at least one small side of the mold.

Dans tous les procédés connus de changement de largeur en marche, la vitesse de déplacement du ou des petits côtés est prédéterminée pour toute la durée du déplacement, de sorte que la longueur du tronçon à largeur variable du produit coulé , appelé tronçon de transition, dépend de la vitesse d'extraction du produit coulé. Il n'est pas possible d'obtenir un tronçon de transition de longueur prédéterminée si la vitesse d'extraction varie accidentellement pendant le changement de largeur. Or il est très important,pour réduire les pertes et faciliter les opérations de laminage, de pouvoir imposer une longueur donnée au tronçon de transition.In all known methods of changing the width on the move, the speed of movement of the short side (s) is predetermined for the entire duration of the movement, so that the length of the variable-width section of the cast product, called the transition section, depends the speed of extraction of the cast product. It is not possible to obtain a transition section of predetermined length if the extraction speed accidentally varies during the change of width. However, to reduce losses and facilitate rolling operations, it is very important to be able to impose a given length on the transition section.

Le but de la présente invention est de fournir un procédé de changement de largeur d'un produit de coulée continue, sans interruption de la coulée, permettant de produire un tronçon de transition de longueur imposée quelle que soit l'évolution de la vitesse d'extraction du produit coulé pendant le changement de largeur.The object of the present invention is to provide a method for changing the width of a continuous casting product, without interrupting the casting, making it possible to produce a transition section of imposed length whatever the evolution of the speed of extraction of the cast product during the change of width.

Le procédé objet de la présente invention est caractérisé en ce qu'on commande les déplacements du petit côté en fonction de la longueur du produit coulé depuis le début du changement de largeur de façon que le tronçon de transition du produit coulé ait une longueur prédéterminée quelle que soit l'évolution de la vitesse d'extraction du produit coulé pendant le changement de largeur. La relation entre l'abscisse d'un point quelconque du petit côté de la lingotière, notamment les points d'attache des vérins à vis utilisés pour déplacer le petit côté, et la longueur du produit coulé pourra être un polynome. En particulier, ce pourra être une relation linéaire.The process which is the subject of the present invention is characterized in that the movements of the short side are controlled as a function of the length of the cast product from the start of the change in width so that the transition section of the cast product has a predetermined length which that is the evolution of the speed of extraction of the cast product during the change of width. The relationship between the abscissa of any point on the small side of the mold, in particular the attachment points of the screw jacks used to move the short side, and the length of the cast product can be a polynomial. In particular, it could be a linear relation.

En général, on prévoiera plusieurs phases pour déplacer le petit côté de sa position initiale à sa position finale, et les relations entre l'abscisse d'un point quelconque du petit côté et la longueur du produit coulé seront différentes d'une phase à l'autre. On pourra en particulier, au début de l'opération de changement de largeur, incliner le petit côté par rapport à sa position initiale d'un angle B correspondant en grandeur et en signe à la pente de la petite face du tronçon de transition, de forme trapézoïdale, puis lui faire subir une rotation de grand rayon et, en fin d'opération, le redresser pour l'amener dans sa position finale. La phase intermédiaire pourra être une rotation autour d'un axe confondu avec l'intersection des plans définis par la face intérieure du petit côté lorsque celui-ci se trouve dans ses positions initiale et finale, respectivement, ou d'un axe confondu avec l'intersection des plans définis par la face intérieure du petit côté lorsque celui-ci se trouve dans les positions intermédiaires faisant l'angle p avec ses positions initiale et finale, respectivement, ou d'un axe parallèle à ces axes et situé au voisinage de ceux-ci.In general, several phases will be used to move the short side from its initial position to its final position, and the relationships between the abscissa of any point on the short side and the length of the cast product will be different from phase to phase. 'other. It will be possible in particular, at the start of the width change operation, to incline the short side with respect to its initial position by an angle B corresponding in magnitude and as a sign to the slope of the small face of the transition section, trapezoidal shape, then make it undergo a rotation of large radius and, at the end of the operation, straighten it to bring it into its final position. The intermediate phase could be a rotation around an axis coincident with the intersection of the planes defined by the inner face of the short side when the latter is in its initial and final positions, respectively, or an axis coincident with the intersection of the planes defined by the inner face of the short side when the latter is in the intermediate positions making the angle p with its initial and final positions, respectively, or of an axis parallel to these axes and located in the vicinity of these.

Pour la mise en oeuvre de ce procédé, on pourra, par exemple, mesurer pendant toute la durée de l'opération de changement de largeur la longueur de produit coulé, calculer périodiquement, à des instants séparés par des intervalles de temps très courts, la distance dont doit être déplacé le petit côté pendant l'intervalle de temps suivant l'instant considéré à partir de la longueur du produit coulé depuis le début de l'opération augmentée de la longueur coulée pendant l'intervalle de temps précédant l'instant considéré, commander le déplacement du petit côté sur la distance calculée, puis à l'instant suivant comparer la longueur réelle du produit coulé pendant l'intervalle de temps qui vient de s'écouler à la longueur du produit coulé pendant l'intervalle de temps précédent et si elles diffèrent corriger de la valeur correspondant à cette différence la nouvelle distance de déplacement du petit côté calculée à cet instant.For the implementation of this process, it will be possible, for example, to measure the length of the poured product throughout the width-changing operation, calculate periodically, at times separated by very short time intervals, the distance by which the short side must be moved during the time interval following the instant considered from the length of the product poured from the start of the operation increased by the length cast during the time interval preceding the instant considered , order the displacement of the short side over the calculated distance, then at the next instant compare the actual length of the product poured during the time which has just elapsed at the length of the product poured during the previous time interval and if they differ correct by the value corresponding to this difference the new distance of movement of the short side calculated at this instant.

La description qui suit se réfère aux dessins qui l'accompagnent et illustrent, à titre d'exemple non limitatif, quelques modes de mise en oeuvre de l'invention. Sur ces dessins :

  • La figure 1 est une vue partielle, en coupe, d'une lingotière conçue pour la mise en oeuvre de l'invention ;
  • La figure 2 est un schéma montrant les phases successives de l'opération d'élargissement de la cavité d'une lingotière à brames suivant le procédé de l'invention ;
  • La figure 3 représente le tronçon de brame produit pendant cet élargissement ;
  • La figure 4 est un schéma illustrant l'opération de rétrécissement de la cavité d'une lingotière suivant le procédé de l'invention ; et
  • La figure 5 représente le tronçon de brame produit pendant ce rétrécissement.
The following description refers to the accompanying drawings and illustrate, by way of non-limiting example, some embodiments of the invention. In these drawings:
  • Figure 1 is a partial view, in section, of an ingot mold designed for the implementation of the invention;
  • FIG. 2 is a diagram showing the successive phases of the operation of enlarging the cavity of an ingot mold with slabs according to the method of the invention;
  • FIG. 3 represents the section of slab produced during this widening;
  • Figure 4 is a diagram illustrating the operation of narrowing the cavity of an ingot mold according to the method of the invention; and
  • FIG. 5 represents the section of slab produced during this shrinking.

Les lingotières de coulée continue utilisées pour la production de brames sont constituées par un chassis 10 en forme de cadre supportant quatre plaques formant les côtés de la lingotière. Les plaques 12 constituant les petits côtés sont normalement serrées entre les plaques 14 constituant les grands côtés par des moyens de pression, tels que vérins ou ressorts. Lorsque ces moyens sont rendus inactifs, les petits côtés peuvent être déplacés pour régler la largeur de la cavité de la lingotière et, par conséquent, des brames produites. Pour supporter et déplacer chaque petit côté, on utilise deux vérins à vis 16 montés sur le chassis 10 et dontun élément, vis ou écrou, est articulé par son extrémité sur la face extérieure du petit côté ; l'autre élément des vérins est accouplé à un servo-moteur électrique 18 dont la rotation est commandée par un automate programmable, un microprocesseur ou un calculateur 20.The continuous casting ingot molds used for the production of slabs consist of a frame 10 in the form of a frame supporting four plates forming the sides of the ingot mold. The plates 12 constituting the short sides are normally clamped between the plates 14 constituting the long sides by pressure means, such as jacks or springs. When these means are made inactive, the short sides can be moved to adjust the width of the mold cavity and, consequently, of the slabs produced. To support and move each short side, using two screw jacks 16 mounted on the chassis 10 and one element, screw or nut, is articulated by its end on the outside of the short side; the other element of the jacks is coupled to an electric servo motor 18 whose rotation is controlled by a programmable automaton, a microprocessor or a computer 20.

Sur la figure 2, on a représenté schématiquement les positions successives d'un petit côté de lingotière qui est déplacé, en s'éloignant de l'axe X-X' de la cavité de la lingotière, pour élargir cette dernière. Lorsque la cavité de la lingotière est courbe, l'axe X'-X représente la trace sur le plan de figure, c'est-à-dire sur le plan médian parallèle aux grandes faces de la lingotière, du plan contenant l'axe de la cavité de la'lingotière. Dans ce qui suit, lorsqu'on se réfèrera à l'axe X-X' il s'agira, le cas échéant, du plan contenant cet axe. La droite A-A3 représente le bord inférieur de la lingotière et la droite B-B3 le niveau de la surface libre du métal dans la lingotière.In Figure 2, there is shown schematically the successive positions of a small side of the mold which is moved away from the axis XX 'of the cavity of the mold, to widen the latter. When the mold cavity is curved, the axis X'-X represents the trace on the plane of the figure, that is to say on the median plane parallel to the large faces of the mold, of the plane containing the axis of the laotière's cavity. In what follows, when reference is made to the axis XX ′, it will be, if appropriate, the plane containing this axis. The line AA 3 represents the lower edge of the mold and the line BB 3 the level of the free surface of the metal in the mold.

Initialement, le petit côté se trouve dans la position A-E ; il est incliné d'un angle α1, par rapport à l'axe X-X', pour tenir compte de la contraction du produit coulé due à son refroidissement en lingotière ; cette inclinaison permet de maintenir le petit côté de la lingotière en contact avec les petites faces du produit coulé pratiquement sur toute la hauteur de la lingotière et,par conséquent, de réduire les risques de percées. On a démontré et vérifié par l'expérience que cette inclinaison est telle que le prolongement de la trace du petit côté passe toujours par un point fixe 0, appelé centre de conicité, pour toutes les largeurs du produit coulé que l'on est capable de produire industriellement.Initially, the short side is in the AE position; it is inclined at an angle α 1 , relative to the axis XX ′, to take account of the contraction of the cast product due to its cooling in the mold; this inclination makes it possible to maintain the short side of the mold in contact with the small faces of the product poured practically over the entire height of the mold and, consequently, to reduce the risks of breakthroughs. It has been demonstrated and verified by experience that this inclination is such that the extension of the trace on the short side always passes through a fixed point 0, called the center of conicity, for all the widths of the cast product that we are able to produce industrially.

Pendant la première phase, le petit côté est amené, par rotation autour d'un axe 01 situé au-dessous de la lingotière, de la position initiale AB à la position A1B1 telle que son plan fasse avec le plan perpendiculaire au plan de la figure et dont la trace sur celui-ci est B10 un angle β dont la tangente est égale à la pente des petites faces du tronçon de transition du produit coulé (voir figure 3). Cet angle dépend de la longueur du tronçon de transition et de la variation de largeur que l'on s'est imposé. La position de l'axe de rotation O1 est choisie de façon à limiter à une valeur acceptable, par exemple 1mm, le jeu entre le petit côté et la petite face du produit coulé et/ou la compression de cette dernière par le petit côté, sur toute la hauteur de la lingotière.During the first phase, the short side is brought, by rotation around an axis 0 1 located below the lingo third, from the initial position AB to position A 1 B 1 such that its plane forms with the plane perpendicular to the plane of the figure and the trace of which on it is B 1 0 an angle β whose tangent is equal to the slope of the small faces of the transition section of the cast product (see Figure 3). This angle depends on the length of the transition section and the variation in width that has been imposed. The position of the axis of rotation O 1 is chosen so as to limit to an acceptable value, for example 1 mm, the clearance between the short side and the small face of the cast product and / or the compression of the latter by the short side. , over the entire height of the mold.

Pendant une seconde phase, on fait pivoter le petit côté autour d'un axe perpendiculaire au plan de la figure et passant par 0 pour l'amener dans la position A2B2. Cet axe est en fait l'intersection de tous les plans définis par la face intérieure du petit côté lorsqu'il est en position normale de coulée, pour différentes largeurs de lingotière.During a second phase, the short side is rotated around an axis perpendicular to the plane of the figure and passing through 0 to bring it into position A 2 B 2 . This axis is in fact the intersection of all the planes defined by the inner face of the short side when it is in the normal casting position, for different widths of the mold.

Pendant la dernière phase, on fait pivoter le petit côté autour d'un axe 02, situé au niveau de la surface libre du métal dans la lingotière ou au voisinage de celui-ci, pour l'amener dans la position choisie A3B3. Dans cette position, le petit côté est incliné d'un angle α2 par rapport à l'axe X'X et le plan de sa face intérieure contient le centre O. Comme dans la première phase, la position de l'axe O2 est choisie pour limiter à une valeur acceptable le jeu entre le petit côté et la petite face du produit coulé et/ou la compression de cette dernière. Pendant les trois phases de l'opération, le petit côté est déplacé en fonction de la longueur du produit coulé. C'est-à-dire que l'abscisse x., compté à partir de l'axe X'-X, d'un point quelconque du petit côté est lié à la longueur 1 du produit coulé depuis le début de la première phase par une relation xi = f(l), f étant un polynome de degré au plus égal à six. En pratique on utilisera chaque fois que cela sera possible une fonction linéaire de la forme xi, = al + b, a et b étant des paramètres différents d'une phase à l'autre et qui peuvent changer au cours d'une même phase.During the last phase, the short side is rotated around an axis 0 2 , located at the level of the free surface of the metal in the ingot mold or in the vicinity thereof, to bring it into the chosen position A 3 B 3 . In this position, the short side is inclined at an angle α 2 relative to the axis X'X and the plane of its interior face contains the center O. As in the first phase, the position of the axis O 2 is chosen to limit the clearance between the short side and the small face of the cast product and / or the compression of the latter to an acceptable value. During the three phases of the operation, the short side is moved according to the length of the cast product. That is to say that the abscissa x., Counted from the axis X'-X, from any point on the short side is linked to the length 1 of the product poured from the start of the first phase by a relation x i = f (l), f being a polynomial of degree at most equal to six. In practice we will use each whenever this is possible a linear function of the form x i , = al + b, a and b being parameters different from one phase to another and which can change during the same phase.

Les mouvements du petit côté sont commandés par les vérins 16 dont la marche est controlée par l'automate ou le calculateur 20 qui leur impose des lois de déplacement linéaire, les déplacements des deux vérins restant pendant chaque phase dans un rapport constant qui dépend de la position choisie pour l'axe de rotation.The movements of the short side are controlled by the jacks 16, the running of which is controlled by the automaton or the computer 20 which imposes on them laws of linear displacement, the displacements of the two jacks remaining during each phase in a constant ratio which depends on the position chosen for the axis of rotation.

Si β est relativement petit, par exemple inférieur à 0,005 rd, on utilisera la même relation xi = a11 + b1 a et b1 étant des constantes, pendant toute la première phase. Si β est plus grand, il pourra être nécessaire de changer les paramètres a et b une ou plusieurs fois pen- dant la première phase (a'1, b'1 - a",, b"1,...) de telle sorte que le déplacement du petit côté soit relativement lent au début de cette première phase, puis plus rapide.If β is relatively small, for example less than 0.005 rd, we will use the same relation x i = a 1 1 + b 1 a and b 1 being constants, throughout the first phase. If β is larger, it may be necessary to change the parameters a and b one or more times Pen- ing the first phase (a '1, b' 1 - a ",, b '1, ...) such so that the movement of the short side is relatively slow at the start of this first phase, then faster.

De même, dans la dernière phase, on utilisera des paramètres a3 et b3 constants si β est petit et, dans le cas contraire, on changera de paramètres (a'3,b'3-a"3,b''3...) de telle sorte que le déplacement du petit côté soit relativement rapide au début de cette phase puis plus lent.Similarly, in the last phase, we will use constant parameters a 3 and b 3 if β is small and, if not, we will change parameters (a ' 3 , b' 3 -a " 3 , b '' 3 ...) so that the movement of the short side is relatively rapid at the start of this phase and then slower.

Pendant la seconde phase, les paramètres a2 et b2 resteront constants.During the second phase, the parameters a 2 and b 2 will remain constant.

Pour la mise en oeuvre du procédé, on mesure en continu la longueur du produit coulé, par exemple au moyen d'un galet 22 appliqué sur une face du produit coulé et associé à un codeur qui délivre des impulsions dont le nombre est proportionnel au nombre de tours du galet et, par conséquent, à la longueur du produit coulé.For the implementation of the method, the length of the cast product is continuously measured, for example by means of a roller 22 applied to one face of the cast product and associated with an encoder which delivers pulses whose number is proportional to the number of turns of the roller and, therefore, the length of the cast product.

Avant tout changement de largeur, l'opérateur introduit dans l'automate 20 les valeurs imposées pour la variation de largeur et la longueur du tronçon de transition. A partir de ces valeurs, qui permettent de définir l'angle β, l'automate sélectionne dans un fichier les valeurs des paramètres al, b -éventuellement a'1, b'1, a"1, b"1... - a2, b2, a3 et b3 -éventuellement a'3,b'3,a"3,b"3...Before any width change, the operator introduces in the controller 20 the values imposed for the variation in width and length of the transition section. From these values, which make it possible to define the angle β, the automaton selects from a file the values of the parameters a l , b - possibly a ' 1 , b' 1 , a " 1 , b" 1 ... - a 2 , b2 , a 3 and b 3 - possibly to ' 3 , b' 3 , a " 3 , b" 3 ...

Le calculateur ou l'automate, qui est équipé d'un centre de calcul, calcule à partir du moment où l'ordre de changement de largeur est donné, et à intervalles de temps réguliers et très courts, par exemple cinq secondes, les déplacements à imposer aux deux vérins 16 pendant l'intervalle de temps qui suit l'instant considéré. A l'instant t , l'automate calcule les abscisses d'un point de réfé- rence de chacune des vis qui correspondent à la position que devra atteindre le petit côté à l'instant tn + 1. Pour cela il remplace 1, dans la relation al + b sélectionnée en fonction de la position du petit côté ou de la longueur du produit coulé, par la valeur mesurée par le galet 22 depuis le début du changement de largeur augmentée d'une lnngueur Δln égale à la longueur coulée pendant l'intervalle de temps tn- tn-1. En utilisant les abscisses calculées comme valeur de consigne, les servomoteurs 18 amènent le petit côté à la position ainsi déterminée à l'instant tn+1.The computer or automaton, which is equipped with a computer center, calculates from the moment the order to change the width is given, and at regular and very short time intervals, for example five seconds, the displacements to be imposed on the two jacks 16 during the time interval which follows the instant considered. At time t, the automaton calculates the abscissae of a reference point of each of the screws which correspond to the position which the short side will have to reach at time t n + 1 . For this it replaces 1, in the relation al + b selected as a function of the position of the short side or the length of the cast product, by the value measured by the roller 22 from the start of the change in width increased by a length Δl n equal to the length cast during the time interval t n - t n-1 . Using the abscissae calculated as the reference value, the servomotors 18 bring the short side to the position thus determined at the instant t n + 1 .

Si la vitesse d'extraction du produit coulé change pendant l'intervalle de temps tn+1 - tn, la longueur Δln+1 du produit coulé pendant cet intervalle ne sera pas égale à Δln et la position du petit côté devra être corrigée. Pour cela, l'automate calculera, à l'instant tn+1, les abscisses corrigées, à partir de la longueur réelle du produit coulé jusqu'à cet instant, puis les différences entre les abscisses réelles et les abscisses corrigées et corrigera en conséquence les nouvelles abscisses calculées pour l'instant tn+2.If the extraction speed of the cast product changes during the time interval t n + 1 - t n , the length Δl n + 1 of the cast product during this interval will not be equal to Δl n and the position of the short side must be corrected. For this, the automaton will calculate, at time t n + 1 , the corrected abscissa, from the real length of the product poured up to this instant, then the differences between the real abscissa and the corrected abscissa and will correct in consequence the new abscissa calculated for the moment t n + 2 .

Pendant la seconde phase, la rotation du petit côté peut se faire autour d'un axe 0' confondu avec l'intersection des plans définis par la face intérieure du petit côté lorsqu'il se trouve dans les positions A1B1 et A2B2, respectivement, ou autour d'un axe voisin de 0 ou de O'.During the second phase, the rotation of the short side can take place around an axis 0 'coinciding with the intersection of the planes defined by the inner face of the short side when it is in positions A 1 B 1 and A 2 B 2 , respectively, or around an axis near 0 or O '.

Pour diminuer la largeur du produit coulé, (figures 4 et 5), on opère de la même façon en faisant basculer, au début de l'opération, le petit côté vers l'intérieur de la lingotière d'un angle e égal à l'angle d'inclinaison des petites faces du tronçon de transition du produit coulé, puis en le faisant pivoter autour d'un axe défini comme dans le cas précédent et passant par 0 ou 0' ou voisin de ceux-ci et enfin en redressant le petit côté par rotation autour d'un axe 02 situé au voisinage du niveau de la surface libre du métal liquide dans la lingotière.To reduce the width of the cast product (Figures 4 and 5), the operation is carried out in the same way by tilting, at the start of the operation, the short side towards the inside of the mold with an angle e equal to l 'angle of inclination of the small faces of the transition section of the cast product, then by rotating it around an axis defined as in the previous case and passing through 0 or 0' or close to them and finally by straightening the short side by rotation about an axis 0 2 located near the level of the free surface of the liquid metal in the mold.

Généralement, on déplacera les deux petits côtés de la lingotière simultanément et de façon symétrique par rapport à l'axe X'X de la lingotière.Generally, the two short sides of the ingot mold will be displaced simultaneously and symmetrically with respect to the axis X'X of the ingot mold.

Claims (10)

1. Procédé pour changer la largeur d'un produit de coulée continue à section rectangulaire, sans interrompre la coulée, par déplacement d'au moins un petit côté de la lingotière, caractérisé en ce qu'on commande les déplacements du petit côté en fonction de la longueur du produit coulé depuis le début de l'opération de changement de largeur de façon que la zone de transition du produit coulé ait une longueur prédéterminée quelle que soit l'évolution de la vitesse d'extraction du produit coulé -pendant cette opération.1. Method for changing the width of a continuous casting product with rectangular section, without interrupting the casting, by displacement of at least one small side of the mold, characterized in that the movements of the short side are controlled as a function of the length of the cast product from the start of the width change operation so that the transition zone of the cast product has a predetermined length regardless of the evolution of the speed of extraction of the cast product during this operation . 2. Procédé selon la revendication 1, caractérisé en ce que pendant une partie au moins de l'opération de changement de largeur, la relation entre l'abscisse d'un point quelconque du petit côté de la lingotière, compté à partir de l'axe longitudinal de la cavité de la lingotière, et la longueur du produit coulé est un polynome.2. Method according to claim 1, characterized in that during at least part of the width changing operation, the relationship between the abscissa of any point on the short side of the mold, counted from the longitudinal axis of the mold cavity, and the length of the cast product is a polynomial. 3. Procédé selon la revendication 1 ou 2, caractérisé en ce que pendant une partie au moins de l'opération de changement de largeur, l'abscisse d'un point quelconque du petit côté de la lingotière est une fonction linéaire de la longueur du produit coulé.3. Method according to claim 1 or 2, characterized in that during at least part of the width changing operation, the abscissa of any point on the short side of the mold is a linear function of the length of the cast product. 4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que, au début de l'opération de changement de largeur, on incline le petit côté vers l'intérieur ou l'extérieur de la lingotière, suivant que l'on veut diminuer ou augmenter la largeur du produit coulé, d'un angle (B) dont-la tangente est égale à la pente des petites faces de la zone de transition du produit coulé, et, en fin d'opération, on redresse le petit côté pour l'amener dans sa position finale.4. Method according to any one of claims 1 to 3, characterized in that, at the start of the width change operation, the small side is tilted inward or outward of the mold, depending on whether the '' we want to decrease or increase the width of the cast product, by an angle (B) whose tangent is equal to the slope of the small faces of the transition zone of the cast product, and, at the end of the operation, we straighten the short side to bring it into its final position. 5. Procédé selon la revendication 4, caractérisé en ce qu'on incline d'abord le petit côté de l'angle p en le faisant pivoter autour d'un axe (O1) situé légèrement au-dessous de la lingotière pour l'amener de sa position initiale dans une première position intermédiaire, puis on le déplace en le faisant pivoter autour d'un deuxième axe (0, 0') situé au-dessous de la lingotière et beaucoup plus éloigné de celle-ci que le premier pour l'amener dans une seconde position intermédiaire et enfin on redresse le petit côté en le faisant pivoter autour d'un axe (O2) situé au niveau de la surface libre du métal dans la lingotière ou au voisinage de celui-ci pour l'amener dans sa position finale.5. Method according to claim 4, characterized in that first inclines the small side of the angle p in the rotating around an axis (O 1 ) located slightly below the mold to bring it from its initial position to a first intermediate position, then it is moved by rotating it around a second axis (0, 0 ') located below the ingot mold and much further from it than the first to bring it into a second intermediate position and finally the small side is straightened by rotating it around an axis (O 2 ) located at the level of the free surface of the metal in the ingot mold or in the vicinity of this one to bring it in its final position. 6. Procédé selon la revendication 4 ou 5, caractérisé en ce que, pendant la première phase de l'opération de changement de largeur, on incline le petit côté de telle sorte que son déplacement soit relativement lent au début de !cette première phase, puis plus rapide.6. Method according to claim 4 or 5, characterized in that, during the first phase of the width changing operation, the short side is inclined so that its movement is relatively slow at the start of this first phase, then faster. 7. Procédé selon la revendication 4, 5 ou 6, caractérisé en ce que, pendant la dernière phase de l'opération de changement de largeur, on redresse le petit côté de telle sorte que son déplacement soit relativement rapide au début de cette dernière phase, puis plus lent.7. Method according to claim 4, 5 or 6, characterized in that, during the last phase of the width change operation, the short side is straightened so that its movement is relatively rapid at the start of this last phase , then slower. 8. Procédé selon la revendication 5, 6 ou 7, caractérisé en ce que l'on amène le petit côté de la première position intermédiaire (A1 B1) à la seconde position intermédiaire (A2 B2) en le faisant pivoter autour d'un axe (0) confondu avec l'intersection des plans définis par la face intérieure du petit côté lorsqu'il se trouve dans les positions initiale (AB) et finale (A3 B3), respectivement, ou situé au voisinage de cette intersection.8. Method according to claim 5, 6 or 7, characterized in that one brings the short side of the first intermediate position (A 1 B 1 ) to the second intermediate position ( A2 B2 ) by rotating it around an axis (0) coincident with the intersection of the planes defined by the inner face of the short side when it is in the initial (AB) and final (A 3 B 3 ) positions, respectively, or located in the vicinity of this intersection . 9. Procédé selon la revendication 5, 6 ou 7, caractérisé en ce que l'on amène le petit côté de la première position intermédiaire (A1 B1) à la seconde position intermédiaire (A2 B2) en le faisant pivoter autour d'un axe (0') confondu avec l'intersection des plans définis par la face intérieure du petit côté lorsqu'il se trouve dans les première et seconde positions intermédiaires, respectivement, ou situé au voisinage de cette intersection.9. Method according to claim 5, 6 or 7, characterized in that one brings the short side of the first intermediate position (A 1 B 1 ) to the second intermediate position (A 2 B 2 ) by rotating it around an axis (0 ') coincident with the intersection of the planes defined by the face interior of the short side when it is in the first and second intermediate positions, respectively, or located in the vicinity of this intersection. 10. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'on mesure en permanence pendant toute la durée de l'opération de changement de largeur la longueur du produit coulé, on calcule périodiquement, à des instants séparés par des intervalles de temps très courts, la distance dont doit être déplacé le petit côté pendant l'intervalle de temps suivant l'instant considéré à partir de la longueur du produit coulé depuis le début de l'opération augmentée dela longueur coulée pendant l'intervalle de temps précédent l'instant considéré, on commande le déplacement du petit côté sur la distance calculée, puis à l'instant suivant on compare la longueur réelle du produit coulé pendant l'intervalle de temps qui vient de s'écouler à celle du produit coulé pendant l'intervalle de temps précédent et si elles diffèrent on corrige de la valeur correspondant à cette différence la nouvelle distance de déplacement du petit côté calculée à cet instant.10. Method according to any one of the preceding claims, characterized in that the length of the cast product is continuously measured throughout the duration of the operation of changing the width, periodically calculated, at times separated by intervals of very short times, the distance by which the short side must be moved during the time interval following the instant considered from the length of the product poured from the start of the operation increased by the length of casting during the time interval preceding the instant considered, the displacement of the short side over the calculated distance is controlled, then at the next instant, the actual length of the product poured during the interval of time which has just elapsed is compared to that of the product poured during the previous time interval and if they differ, the new distance of displacement of the short side calculated at this instant is corrected by the value corresponding to this difference.
EP84402211A 1983-11-23 1984-11-05 Method of changing the width of a continuously cast strand without interrupting the casting Expired EP0147258B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84402211T ATE32844T1 (en) 1983-11-23 1984-11-05 PROCEDURE FOR CHANGING THE WIDTH OF A STRIP IN CONTINUOUS CASTING WITHOUT STOPPING THE CASTING.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8318671A FR2555079B1 (en) 1983-11-23 1983-11-23 PROCESS FOR MODIFYING THE WIDTH OF A SLAB PRODUCED IN CONTINUOUS CASTING WITHOUT INTERRUPTING THE CASTING
FR8318671 1983-11-23

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EP0147258A1 true EP0147258A1 (en) 1985-07-03
EP0147258B1 EP0147258B1 (en) 1988-03-09

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EP (1) EP0147258B1 (en)
JP (1) JPS60118364A (en)
AT (1) ATE32844T1 (en)
DE (1) DE3469688D1 (en)
FR (1) FR2555079B1 (en)

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EP0237629A1 (en) * 1986-02-15 1987-09-23 MANNESMANN Aktiengesellschaft Motor control for the adjustment of a small side plate of a continuous casting mould for metal, especially steel
AT405147B (en) * 1992-07-08 1999-05-25 Voest Alpine Ind Anlagen Method for increasing the width of a cast strand during continuous casting

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WO1992002324A1 (en) * 1990-08-09 1992-02-20 Voest-Alpine International Corp. An improved method for controlling the clamping forces exerted on a continuous casting mold
US5205345A (en) * 1991-08-07 1993-04-27 Acutus Industries Method and apparatus for slab width control
US6857464B2 (en) * 2002-09-19 2005-02-22 Hatch Associates Ltd. Adjustable casting mold
US20060137851A1 (en) * 2004-12-27 2006-06-29 Gyan Jha Shaped direct chill aluminum ingot
US8381385B2 (en) * 2004-12-27 2013-02-26 Tri-Arrows Aluminum Inc. Shaped direct chill aluminum ingot
DE102007039882A1 (en) * 2007-04-26 2008-11-06 Sms Demag Ag continuous casting
US20090050290A1 (en) * 2007-08-23 2009-02-26 Anderson Michael K Automated variable dimension mold and bottom block system
US9545662B2 (en) * 2007-08-23 2017-01-17 Wagstaff, Inc. Automated variable dimension mold and bottom block system
US10350674B2 (en) * 2017-06-12 2019-07-16 Wagstaff, Inc. Dynamic mold shape control for direct chill casting
US11883876B2 (en) 2017-06-12 2024-01-30 Wagstaff, Inc. Dynamic mold shape control for direct chill casting
US11331715B2 (en) 2017-06-12 2022-05-17 Wagstaff, Inc. Dynamic mold shape control for direct chill casting
US11717882B1 (en) 2022-02-18 2023-08-08 Wagstaff, Inc. Mold casting surface cooling

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GB2079198A (en) * 1980-07-03 1982-01-20 Nippon Steel Corp A method of reducing the width of a continuous casting mould during casting

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EP0237629A1 (en) * 1986-02-15 1987-09-23 MANNESMANN Aktiengesellschaft Motor control for the adjustment of a small side plate of a continuous casting mould for metal, especially steel
AT405147B (en) * 1992-07-08 1999-05-25 Voest Alpine Ind Anlagen Method for increasing the width of a cast strand during continuous casting

Also Published As

Publication number Publication date
ATE32844T1 (en) 1988-03-15
EP0147258B1 (en) 1988-03-09
JPS60118364A (en) 1985-06-25
US4635704A (en) 1987-01-13
FR2555079A1 (en) 1985-05-24
DE3469688D1 (en) 1988-04-14
FR2555079B1 (en) 1986-03-28

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