EP0761343A1 - Method and apparatus for starting a continuous roll caster installation - Google Patents
Method and apparatus for starting a continuous roll caster installation Download PDFInfo
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- EP0761343A1 EP0761343A1 EP96420255A EP96420255A EP0761343A1 EP 0761343 A1 EP0761343 A1 EP 0761343A1 EP 96420255 A EP96420255 A EP 96420255A EP 96420255 A EP96420255 A EP 96420255A EP 0761343 A1 EP0761343 A1 EP 0761343A1
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- Prior art keywords
- injector
- law
- tank
- liquid metal
- cylinders
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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
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0637—Accessories therefor
- B22D11/064—Accessories therefor for supplying molten metal
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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
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
Definitions
- the invention relates to the field of continuous casting between rolls (generally known in English as rollcasting) of aluminum and its alloys.
- the invention relates more particularly to the casting of aluminum or aluminum alloy strips of thickness less than or equal to 4.5 mm.
- strips are then cold rolled to the final thickness which depends on the intended application.
- a strip intended for the beverage can application will be cold rolled from the thickness 6/10 mm from the continuous casting machine up to approximately 0.3 mm.
- the injectors usually used in the continuous casting between cylinders of thicker strips (6-10 mm) can be used.
- These injectors have a wide variety of shapes, with or without baffles and spacers and are generally made from refractory materials such as ceramic fibers for example.
- a conventional injector is shown in fig. 3a.
- An injector has an upper part (15) and a lower part (16) between which the liquid metal flows.
- the injector has three zones: an upstream zone called tank (11) which receives the liquid metal coming from the furnace (31), a central zone (12) which can include a number of baffles and spacers and an end zone , cylinder side, which is usually designated by the term lips (13).
- FIG. 3b Such an injector is shown in FIG. 3b.
- the tank (11) which receives the liquid metal from the furnace and distributes it in the central area of the injector (12) may have a width less than the width of the central area of the injector (12). This is the case shown in fig. 4a. But in this case, "dead" zones are created in the flow of the liquid metal which make it more difficult to control the temperature of the liquid metal during the start-up period. For starting a thin strip casting ( ⁇ 4.5 mm), it is more advantageous to use a tank whose width is equal to the width of the central area of the injector (fig. 4b). This tank may or may not be equipped with an electromagnetic stirrer intended to homogenize the temperature of the metal contained.
- FIG. 5a represents a configuration where the injector is drawn in such a way that the passage between the tank (11) and the central area (12) is completely free over the entire width of the injector.
- the corresponding dam (14) is constituted by a plate in one piece over the entire width.
- FIG. 5b represents a configuration where the passage between the tank (11) and the central zone of the injector (12) is obstructed by a spacer forming an integral part of the injector. This spacer is pierced with several passage orifices distributed over the entire width of the injector. To the right of each of the orifices is a dam (14).
- the materials used for this dam (s) are all the materials usually used in the casting of aluminum such as refractory or potey steel.
- the control of the temperatures of the liquid metal all along the chain which goes from the oven to the cylinders is an essential point for a successful start-up.
- the thermal inertia of the furnace or the presence of continuous treatment and / or filtration devices make this control more difficult.
- the optimal conditions for starting with regard to the temperature of the liquid metal are significantly different from the conditions of the steady state and the transition from the start regime to the steady state requires a lot of time which affects the productivity of the machine. and the regularity of the quality of the tape. It is useful in this case to provide a reserve of extra liquid metal in an oven or an annex pocket, maintained at a precise temperature. This make-up liquid metal replaces or is added to the liquid metal coming from the oven during the start-up period.
- the sensor (21) can be inductive or capacitive or laser.
- the actuator (23) can be a stopper or hatch actuator.
- the law of evolution of the level given as a setpoint to the regulator (23) is, in a simplified version of the invention, a law predetermined by prior experiments and simply a function of time. It is also possible to give the regulator (23), as a setpoint, a level law dependent on the casting speed and not on the time. Finally, it is possible to adopt a mixed solution where the level law is a pre-established law as a function of time, possibly corrected by the speed measurement when it deviates from a given range.
- the law of displacement of the injector support given as a setpoint to the regulator (44) is in a simplified version of the invention a law predetermined by prior experiments and simply a function of time. It is also possible to give the regulator (44) as a setpoint a law of displacement of the injector support depending on the measurement of the tightening of the cylinders or a law of displacement depending on a measurement in situ of the position of the injector . Finally, it is possible to adopt mixed solutions where the displacement law is a pre-established law and a function of time, possibly corrected by measuring the tightening of the cylinders and / or measuring the position of the injector when these parameters are 'deviate from a given range.
- the aim of this permanent adjustment of the position of the injector is to maintain between 0.1 and 0.5 mm the distance between the lips of the cylinders and to make the central plane of the injector coincide with the casting plane ( 53) equidistant from the two cylinders.
- the starting method and device according to the invention find their full effectiveness when all of the operations are automated, thus avoiding the risks of human failure.
- the method according to the invention can also be used while maintaining manual interventions such as for example the opening of the dam (s).
- Figure 1 is a schematic sectional view of a casting machine between rolls.
- Figure 2 is a schematic top view of a casting machine between rolls.
- Figure 3a shows in section a conventional tank / injector assembly.
- Figure 3b shows in section a tank / injector assembly according to a preferred version of the invention.
- FIG. 4a represents in perspective a tank / injector assembly where the tank has a width less than the width of the central zone of the injector.
- FIG. 4b represents in perspective a tank / injector assembly according to a preferred version of the invention where the width of the tank is equal to the width of the central area of the injector.
- FIG. 5a represents in perspective a tank / injector assembly where the passage between tank and central area of the injector is closed by a spacer itself pierced with passages spaced over the entire width.
- Figure 5b shows in perspective an injector tank assembly according to a preferred version of the invention where the passage between tank and central area of the injector is completely free and where the dam consists of a plate in one piece over all the width.
Abstract
Description
L'invention concerne le domaine de la coulée continue entre cylindres (généralement désignée en anglais sous le terme de rollcasting) de l'aluminium et ses alliages. L'invention concerne plus particulièrement la coulée de bandes d'aluminium ou alliage d'aluminium d'épaisseur inférieure ou égale à 4,5 mm.The invention relates to the field of continuous casting between rolls (generally known in English as rollcasting) of aluminum and its alloys. The invention relates more particularly to the casting of aluminum or aluminum alloy strips of thickness less than or equal to 4.5 mm.
Plus d'une centaine de machines de coulée continue entre cylindres fonctionnent actuellement de manière tout à fait industrielle et produisent plus d'un million de tonnes par an de bandes d'aluminium d'épaisseur comprise entre 6 et 10 mm.More than a hundred machines for continuous casting between cylinders currently operate in an entirely industrial way and produce more than a million tonnes per year of aluminum strips of thickness between 6 and 10 mm.
Ces bandes sont ensuite laminées à froid jusqu'à l'épaisseur finale qui dépend de l'application visée. A titre d'exemple une bande destinée à l'application boîte boisson sera laminée à froid à partir de l'épaisseur 6/10 mm issue de la machine de coulée continue jusqu'à 0,3 mm environ.These strips are then cold rolled to the final thickness which depends on the intended application. By way of example, a strip intended for the beverage can application will be cold rolled from the thickness 6/10 mm from the continuous casting machine up to approximately 0.3 mm.
Depuis longtemps, les fabricants et utilisateurs de ces machines de coulée continue entre cylindres se préoccupent de diminuer l'épaisseur de coulée pour réduire le nombre de passes de laminage à froid ultérieures donc les frais de transformation. Une motivation particulière est de plus apportée dans le cas fréquent où coexistent la coulée continue entre cylindres et le procédé conventionnel comportant coulée de plateaux et laminage à chaud dans un laminoir classique. Les laminoirs à chaud classiques fournissent une bande d'épaisseur 2/3 mm. Si les machines de coulée continue entre cylindres pouvaient fournir des bandes de cette épaisseur, la ligne de laminage à froid ultérieure pourrait recevoir indifféremment des bandes issues de coulée continue entre cylindres ou des bandes issues du procédé conventionnel avec des conséquences très favorables sur l'organisation de la production et la productivité des laminoirs à froid.For a long time, the manufacturers and users of these machines for continuous casting between rolls have been concerned with reducing the thickness of casting to reduce the number of subsequent cold rolling passes and therefore the processing costs. A particular motivation is also provided in the frequent case where continuous casting between rolls coexists with the conventional process comprising casting of plates and hot rolling in a conventional rolling mill. Conventional hot rolling mills provide a 2/3 mm thick strip. If the machines for continuous casting between rolls could supply strips of this thickness, the subsequent cold rolling line could indifferently receive strips coming from continuous casting between rolls or strips coming from the conventional process with very favorable consequences for the organization of production and the productivity of cold rolling mills.
Une autre motivation déjà ancienne pour couler plus mince résulte des études de simulation numérique du procédé de coulée continue entre cylindres. Ces études ont montré que, en coulant plus mince, on pouvait augmenter beaucoup la vitesse de coulée à tel point que la productivité de la machine de coulée en tonnes par heure et à largeur de bande constante serait augmentée si on réduisait l'épaisseur. Ces études de simultation ont été confirmées par des essais de laboratoire ou sur ligne pilote.Another motivation already old for thinner casting results from numerical simulation studies of the continuous casting process between cylinders. These studies have shown that, with thinner casting, the casting speed could be greatly increased to such an extent that the productivity of the casting machine in tonnes per hour and at constant bandwidth would be increased if the thickness were reduced. These simultaneous studies have been confirmed by laboratory or pilot line tests.
On peut donc envisager grâce à la coulée à faible épaisseur de faire d'une pierre deux coups. D'une part on peut augmenter la production de la machine de coulée donc diminuer le coût de la bande. D'autre part on peut fournir une bande plus proche de l'épaisseur finale donc nécessitant moins de frais de transformation ultérieure.We can therefore consider thanks to the thin casting to kill two birds with one stone. On the one hand, the production of the casting machine can be increased, thus reducing the cost of the strip. On the other hand, it is possible to provide a strip closer to the final thickness, therefore requiring less subsequent processing costs.
Malgré tous ces avantages potentiels, la coulée continue entre cylindres d'une bande mince (≤ 4,5 mm) ne s'est pas encore développée industriellement. Un des obstacles les plus importants réside dans la difficulté du démarrage de la machine.Despite all these potential advantages, continuous casting between rolls of a thin strip (≤ 4.5 mm) has not yet developed industrially. One of the most important obstacles is the difficulty of starting the machine.
Le démarrage d'une machine de coulée continue conventionnelle (épaisseur de bande de 6 à 10 mm) n'est déjà pas simple. D'une part il faut assurer dans le sens large une distribution homogène du métal liquide (on coule des bandes jusqu'à 2 m de large). D'autre part dans le sens longitudinal de la bande, il faut trouver un équilibre entre une solidification trop rapide bloquant la machine et une solidification trop lente aboutissant à des percées de métal liquide en sortie de machine.Starting a conventional continuous casting machine (strip thickness from 6 to 10 mm) is already not easy. On the one hand, it is necessary to ensure in the broad sense a homogeneous distribution of the liquid metal (bands are run up to 2 m wide). On the other hand in the longitudinal direction of the strip, it is necessary to find a balance between a too rapid solidification blocking the machine and a too slow solidification resulting in breakthroughs of liquid metal leaving the machine.
On comprend aisément que la maitrise de ces deux aspects est rendue beaucoup plus difficile encore lorsque l'on essaie de couler à des épaisseurs ≤ 4,5 mm. C'est ce qui a longtemps bloqué le développement industriel de la coulée mince entre cylindres et c'est le problème que résoud la présente invention.It is easy to understand that the mastery of these two aspects is made much more difficult even when one tries to pour at thicknesses ≤ 4.5 mm. This is what has long blocked the industrial development of thin casting between cylinders and this is the problem which the present invention solves.
Le premier objet de l'invention est un procédé pour le démarrage d'une machine de coulée continue entre cylindres produisant des bandes d'aluminium ou d'alliage d'aluminium d'épaisseur inférieure ou égale à 4,5 mm caractérisé en ce qu'il comprend les étapes suivantes :
- mise en place d'un capteur du niveau du métal liquide dans le bac de l'injecteur
- mise en place d'un ou plusieurs barrage(s) amovible(s) entre le bac et la zone centrale de l'injecteur
- préchauffage de l'ensemble de l'injecteur
- préchauffage des cylindres de la machine de coulée
- déclenchement de la rotation des cylindres
- déclenchement de l'alimentation en métal liquide
- ouverture du(des) barrage(s) lorsqu'est atteint dans le bac un niveau de métal liquide donné
- régulation automatique du niveau du métal liquide dans le bac
- ajustement de la position de l'injecteur pendant la phase de démarrage pour maintenir constante la distance entre les lèvres de l'injecteur et les cylindres.
- installation of a liquid metal level sensor in the injector tank
- installation of one or more removable dam (s) between the tank and the central area of the injector
- preheating of the entire injector
- preheating of the casting machine cylinders
- initiation of cylinder rotation
- liquid metal feed trigger
- opening of the dam (s) when a given level of liquid metal is reached in the tank
- automatic regulation of the level of liquid metal in the tank
- adjustment of the injector position during the start-up phase to keep the distance between the injector lips and the cylinders constant.
Le deuxième objet de l'invention est un dispositif pour alimenter en métal liquide une machine de coulée continue entre cylindres produisant des bandes d'aluminium ou d'alliage d'aluminium d'épaisseur inférieure ou égale à 4,5 mm. Ce dispositif sert à alimenter la machine pendant toute la durée de la coulée mais il résoud également le problème critique du démarrage de la machine. Ce dispositif comprend :
- un injecteur (1) destiné à amener le métal liquide entre les cylindres (51) comprenant un bac (11), une zone centrale (12) et des lèvres d'extrémité (13)
- un(des) barrage(s) (14) amovible(s) entre le bac (11) et la zone centrale de l'injecteur (12)
- un capteur de niveau du métal liquide (21) positionné dans le bac (11) - un actionneur (22) agissant sur le basculement du four d'alimentation ou sur la plus ou moins grande ouverture de l'orifice du four d'alimentation.
- un premier régulateur (23) disposant d'une consigne de niveau, comparant à cette consigne le niveau réel fourni par ledit capteur de niveau (21) et agissant en conséquence sur ledit actionneur (22) pour respecter la loi de niveau
- un support d'injecteur (41) qui peut se déplacer horizontalement dans l'axe de la coulée et verticalement perpendiculairement à l'axe de la coulée grâce à un mécanisme de déplacement (43) et qui est équipé de capteurs de position (42)
- un deuxième régulateur (44) qui dispose d'une consigne de déplacement du support d'injecteur (41), la compare à la position réelle fournie par les capteurs de position (42) et provoque en conséquence le déplacement dudit support d'injecteur (41) pour respecter la consigne.
- an injector (1) intended to bring the liquid metal between the cylinders (51) comprising a tank (11), a central zone (12) and end lips (13)
- one (s) removable dam (s) (14) between the tank (11) and the central area of the injector (12)
- a liquid metal level sensor (21) positioned in the tank (11) - An actuator (22) acting on the tilting of the supply furnace or on the more or less large opening of the orifice of the supply furnace.
- a first regulator (23) having a level setpoint, comparing to this setpoint the actual level supplied by said level sensor (21) and acting accordingly on said actuator (22) to comply with the level law
- an injector support (41) which can move horizontally in the axis of the pouring and vertically perpendicular to the axis of the pouring by means of a displacement mechanism (43) and which is equipped with position sensors (42)
- a second regulator (44) which has a setpoint for displacement of the injector support (41), compares it to the actual position supplied by the position sensors (42) and consequently causes the displacement of said injector support ( 41) to comply with the instructions.
On peut utiliser dans le cadre de l'invention les injecteurs habituellement utilisés dans la coulée continue entre cylindres des bandes plus épaisses (6-10 mm). Ces injecteurs ont des formes très variées, comportent ou non des chicanes et des entretoises et sont fabriqués généralement dans des matériaux réfractaires comme par exemple des fibres céramiques.In the context of the invention, the injectors usually used in the continuous casting between cylinders of thicker strips (6-10 mm) can be used. These injectors have a wide variety of shapes, with or without baffles and spacers and are generally made from refractory materials such as ceramic fibers for example.
Un injecteur conventionnel est représenté fig. 3a.A conventional injector is shown in fig. 3a.
Un injecteur comporte une partie supérieure (15) et une partie inférieure (16) entre lesquelles s'écoule le métal liquide. L'injecteur comporte trois zones : une zone amont appelée bac (11) qui reçoit le métal liquide en provenance du four (31), une zone centrale (12) qui peut comporter un certain nombre de chicanes et entretoises et une zone d'extrémité, côté cylindres, que l'on désigne habituellement par le terme de lèvres (13).An injector has an upper part (15) and a lower part (16) between which the liquid metal flows. The injector has three zones: an upstream zone called tank (11) which receives the liquid metal coming from the furnace (31), a central zone (12) which can include a number of baffles and spacers and an end zone , cylinder side, which is usually designated by the term lips (13).
Bien que les injecteurs habituels puissent être utilisés dans le cadre de l'invention, la demanderesse a mis en évidence que, dans le cas particulièrement difficile de la coulée de bande mince (≤ 4,5 mm), il était avantageux d'utiliser un injecteur particulier qui comporte les caractéristiques suivantes : d'une part les faces internes des deux lèvres (13) qui sont en contact avec le métal liquide sont parallèles; d'autre part l'injecteur est dessiné d'une manière telle que la distance qui sépare sa partie supérieure (15) et sa partie inférieure (16) dans la zone centrale (12), distance qui correspond à l'épaisseur de métal liquide quand la machine de coulée est en fonctionnement, est notablement supérieure à la distance qui sépare les faces internes parallèles des deux lèvres (13) à l'extrémité de l'injecteur. Il se crée ainsi une charge de métal qui s'avère très favorable au démarrage d'une coulée de bandes minces (≤ 4,5 mm) dans le cadre de l'invention.Although the usual injectors can be used in the context of the invention, the applicant has demonstrated that, in the particularly difficult case of thin strip casting (≤ 4.5 mm), it was advantageous to use a particular injector which has the following characteristics: on the one hand the internal faces of the two lips (13) which are in contact with the liquid metal are parallel; on the other hand the injector is drawn in such a way that the distance which separates its upper part (15) and its lower part (16) in the central zone (12), distance which corresponds to the thickness of liquid metal when the casting machine is in operation, is considerably greater than the distance which separates the parallel internal faces of the two lips (13) at the end of the injector. This creates a metal charge which is very favorable for starting a casting of thin strips (≤ 4.5 mm) in the context of the invention.
Les meilleurs résultats sont obtenus lorsque l'épaisseur de métal liquide dans la zone centrale de l'injecteur est comprise entre 1,5 et 5 fois l'épaisseur du métal liquide entre les lèvres.The best results are obtained when the thickness of liquid metal in the central zone of the injector is between 1.5 and 5 times the thickness of the liquid metal between the lips.
Un tel injecteur est représenté à la fig. 3b.Such an injector is shown in FIG. 3b.
Le bac (11) qui reçoit le métal liquide en provenance du four et le répartit dans la zone centrale de l'injecteur (12) peut avoir une largeur inférieure à la largeur de la zone centrale de l'injecteur (12). C'est le cas représenté fig. 4a. Mais il se crée dans ce cas là des zones "mortes" dans l'écoulement du métal liquide qui rendent plus difficile la maitrise de la température du métal liquide pendant la période de démarrage. Pour le démarrage d'une coulée de bande mince (≤ 4,5 mm), il est plus avantageux d'utiliser un bac dont la largeur est égale à la largeur de la zone centrale de l'injecteur (fig. 4b). Ce bac peut ou non être équipé d'un brasseur électromagnétique destiné à homogénéiser la température du métal contenu.The tank (11) which receives the liquid metal from the furnace and distributes it in the central area of the injector (12) may have a width less than the width of the central area of the injector (12). This is the case shown in fig. 4a. But in this case, "dead" zones are created in the flow of the liquid metal which make it more difficult to control the temperature of the liquid metal during the start-up period. For starting a thin strip casting (≤ 4.5 mm), it is more advantageous to use a tank whose width is equal to the width of the central area of the injector (fig. 4b). This tank may or may not be equipped with an electromagnetic stirrer intended to homogenize the temperature of the metal contained.
Plusieurs configurations sont possibles pour le(s) barrage(s) (14) séparant le bac (11) de la zone centrale de l'injecteur (12). La figure 5a représente une configuration où l'injecteur est dessiné de telle manière que le passage entre le bac (11) et la zone centrale (12) est entièrement libre sur toute la largeur de l'injecteur. Dans ce cas le barrage (14) correspondant est constitué par une plaque d'un seul tenant sur toute la largeur. La figure 5b représente une configuration où le passage entre le bac (11) et la zone centrale de l'injecteur (12) est obstrué par une entretoise faisant partie intégrante de l'injecteur. Cette entretoise est percée de plusieurs orifices de passage répartis sur toute la largeur de l'injecteur. Au droit de chacun des orifices, se trouve un barrage (14).Several configurations are possible for the dam (s) (14) separating the tank (11) from the central area of the injector (12). FIG. 5a represents a configuration where the injector is drawn in such a way that the passage between the tank (11) and the central area (12) is completely free over the entire width of the injector. In this case the corresponding dam (14) is constituted by a plate in one piece over the entire width. FIG. 5b represents a configuration where the passage between the tank (11) and the central zone of the injector (12) is obstructed by a spacer forming an integral part of the injector. This spacer is pierced with several passage orifices distributed over the entire width of the injector. To the right of each of the orifices is a dam (14).
Toutes ces configurations sont possibles dans le cadre de l'invention. Les matériaux utilisés pour ce(s) barrage(s) sont tous les matériaux habituellement utilisés dans la coulée d'aluminium tels que réfractaire ou acier poteyé.All these configurations are possible within the framework of the invention. The materials used for this dam (s) are all the materials usually used in the casting of aluminum such as refractory or potey steel.
La maitrise des températures du métal liquide tout le long de la chaîne qui va du four aux cylindres est un point essentiel pour réussir un démarrage. Dans certaines installations, l'inertie thermique du four ou la présence de dispositifs de traitement et/ou de filtration en continu rendent plus difficile cette maitrise. Il arrive que les conditions optimales pour le démarrage en ce qui concerne la température du métal liquide soient sensiblement différentes des conditions du régime permanent et que le passage du régime de démarrage au régime permanent nécessite beaucoup de temps ce qui nuit à la productivité de la machine et à la régularité de la qualité de la bande. Il est utile dans ce cas de prévoir une réserve de métal liquide d'appoint dans un four ou une poche annexes, maintenu à une température précise. Ce métal liquide d'appoint se substitue ou s'ajoute au métal liquide en provenance du four pendant la période de démarrage.The control of the temperatures of the liquid metal all along the chain which goes from the oven to the cylinders is an essential point for a successful start-up. In some installations, the thermal inertia of the furnace or the presence of continuous treatment and / or filtration devices make this control more difficult. Sometimes the optimal conditions for starting with regard to the temperature of the liquid metal are significantly different from the conditions of the steady state and the transition from the start regime to the steady state requires a lot of time which affects the productivity of the machine. and the regularity of the quality of the tape. It is useful in this case to provide a reserve of extra liquid metal in an oven or an annex pocket, maintained at a precise temperature. This make-up liquid metal replaces or is added to the liquid metal coming from the oven during the start-up period.
On peut utiliser dans le cadre de l'invention tout système de régulation de niveau habituellement utilisé dans la coulée de l'aluminium en général. Le capteur (21) peut être inductif ou capacitif ou laser. L'actionneur (23) peut être un actionneur à quenouille ou à trappe. La demanderesse a cependant mis en évidence qu'il était particulièrement avantageux d'utiliser pour le démarrage d'une coulée de bandes minces (≤ 4,5 mm) un capteur capacitif qui a l'avantage d'avoir un temps de réponse rapide.Any level control system usually used in the casting of aluminum in general can be used in the context of the invention. The sensor (21) can be inductive or capacitive or laser. The actuator (23) can be a stopper or hatch actuator. The Applicant has however highlighted that it was particularly advantageous to use a capacitive sensor for the start of a casting of thin strips (≤ 4.5 mm) which has the advantage of having a rapid response time.
La loi d'évolution du niveau donnée comme consigne au régulateur (23) est dans une version simplifiée de l'invention une loi préétablie par des expérimentations préalables et simplement fonction du temps. Il est possible également de donner au régulateur (23) comme consigne une loi de niveau dépendant de la vitesse de coulée et non du temps. Il est possible enfin d'adopter une solution mixte où la loi de niveau est une loi préétablie en fonction du temps, éventuellement corrigée par la mesure de vitesse lorsque celle-ci s'écarte d'une plage donnée.The law of evolution of the level given as a setpoint to the regulator (23) is, in a simplified version of the invention, a law predetermined by prior experiments and simply a function of time. It is also possible to give the regulator (23), as a setpoint, a level law dependent on the casting speed and not on the time. Finally, it is possible to adopt a mixed solution where the level law is a pre-established law as a function of time, possibly corrected by the speed measurement when it deviates from a given range.
La loi de déplacement du support d'injecteur donnée comme consigne au régulateur (44) est dans une version simplifiée de l'invention une loi préétablie par des expérimentations préalables et simplement fonction du temps. Il est possible également de donner au régulateur (44) comme consigne une loi de déplacement du support de l'injecteur dépendant de la mesure du serrage des cylindres ou une loi de déplacement dépendant d'une mesure in situ de la position de l'injecteur. Il est possible enfin d'adopter des solutions mixtes où la loi de déplacement est une loi préétablie et fonction du temps, éventuellement corrigée par la mesure du serrage des cylindres et/ou de la mesure de la position de l'injecteur lorsque ces paramètres s'écartent d'une plage donnée. Le but de cet ajustement permanent de la position de l'injecteur est de maintenir entre 0,1 et 0,5 mm la distance qui sépare les lèvres des cylindres et de faire coïncider le plan central de l'injecteur avec le plan de coulée (53) équidistant des deux cylindres.The law of displacement of the injector support given as a setpoint to the regulator (44) is in a simplified version of the invention a law predetermined by prior experiments and simply a function of time. It is also possible to give the regulator (44) as a setpoint a law of displacement of the injector support depending on the measurement of the tightening of the cylinders or a law of displacement depending on a measurement in situ of the position of the injector . Finally, it is possible to adopt mixed solutions where the displacement law is a pre-established law and a function of time, possibly corrected by measuring the tightening of the cylinders and / or measuring the position of the injector when these parameters are 'deviate from a given range. The aim of this permanent adjustment of the position of the injector is to maintain between 0.1 and 0.5 mm the distance between the lips of the cylinders and to make the central plane of the injector coincide with the casting plane ( 53) equidistant from the two cylinders.
Le déplacement précis du support d'injecteur qui permet d'ajuster le positionnement de celui-ci est assuré par tout moyen classique en mécanique compte tenu de la précision recherchée et de l'environnement particulier d'une coulée d'aluminium. Par exemple des moteurs pas à pas conviennent parfaitement.The precise displacement of the injector support which makes it possible to adjust the positioning of the latter is ensured by any conventional mechanical means taking into account the desired precision and the particular environment of an aluminum casting. For example, stepping motors are perfectly suitable.
Le procédé et le dispositif de démarrage suivant l'invention trouvent leur pleine efficacité lorsque l'ensemble des opérations est automatisé, évitant ainsi les risques de défaillance humaine. Mais on peut également utiliser le procédé suivant l'invention en maintenant des interventions manuelles comme par exemple l'ouverture du ou des barrages.The starting method and device according to the invention find their full effectiveness when all of the operations are automated, thus avoiding the risks of human failure. However, the method according to the invention can also be used while maintaining manual interventions such as for example the opening of the dam (s).
Dans une version complètement automatisée du procédé suivant l'invention, le processus détaillé est le suivant :
- introduction manuelle des données concernant l'alliage et l'épaisseur coulée
- recherche automatique dans le fichier des lois correspondantes de niveau et de déplacement de l'injecteur
- recherche automatique des consignes concernant les températures au démarrage dans le bac, l'injecteur, les cylindres
- vérification automatique par les capteurs appropriés que ces consignes sont respectées. Vérification automatique par un capteur approprié de la fermeture du barrage
- indication "Prêt au démarrage"
- déclenchement manuel de la coulée
- mise en route automatique de la rotation des cylindres
- ouverture automatique du barrage lorsque le niveau de consigne est atteint
- régulation automatique de l'alimentation en métal liquide par le couple capteur-actionneur de niveau dans le bac suivant la loi sélectionnée
- ajustement automatique de la position de l'injecteur suivant la loi sélectionnée.
- manual input of data concerning alloy and casting thickness
- automatic search in the file of the corresponding laws of level and displacement of the injector
- automatic search for instructions concerning starting temperatures in the tank, the injector, the cylinders
- automatic verification by the appropriate sensors that these instructions are observed. Automatic verification by a suitable sensor of the closure of the dam
- indication "Ready to start"
- manual initiation of casting
- automatic start of cylinder rotation
- automatic barrier opening when the setpoint level is reached
- automatic regulation of the supply of liquid metal by the sensor-level actuator pair in the tank according to the selected law
- automatic adjustment of the injector position according to the selected law.
La figure 1 est une vue de en coupe schématisée d'une machine de coulée entre cylindres.Figure 1 is a schematic sectional view of a casting machine between rolls.
La figure 2 est une vue de dessus schématisée d'une machine de coulée entre cylindres.Figure 2 is a schematic top view of a casting machine between rolls.
La figure 3a représente en coupe un ensemble bac/injecteur conventionnel.Figure 3a shows in section a conventional tank / injector assembly.
La figure 3b représente en coupe un ensemble bac/injecteur suivant une version préférée de l'invention.Figure 3b shows in section a tank / injector assembly according to a preferred version of the invention.
La figure 4a représente en perspective un ensemble bac/injecteur où le bac a une largeur inférieure à la largeur de la zone centrale de l'injecteur.FIG. 4a represents in perspective a tank / injector assembly where the tank has a width less than the width of the central zone of the injector.
La figure 4b représente en perspective un ensemble bac/injecteur suivant une version préférée de l'invention où la largeur du bac est égale à la largeur de la zone centrale de l'injecteur.FIG. 4b represents in perspective a tank / injector assembly according to a preferred version of the invention where the width of the tank is equal to the width of the central area of the injector.
La figure 5a représente en perspective un ensemble bac/injecteur où le passage entre bac et zone centrale de l'injecteur est fermé par une entretoise elle-même percée de passages espacés sur toute la largeur.FIG. 5a represents in perspective a tank / injector assembly where the passage between tank and central area of the injector is closed by a spacer itself pierced with passages spaced over the entire width.
La figure 5b représente en perspective un ensemble bac injecteur suivant une version préférée de l'invention où le passage entre bac et zone centrale de l'injecteur est entièrement libre et où le barrage est constitué d'une plaque d'un seul tenant sur toute la largeur.Figure 5b shows in perspective an injector tank assembly according to a preferred version of the invention where the passage between tank and central area of the injector is completely free and where the dam consists of a plate in one piece over all the width.
Claims (16)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9509645 | 1995-08-03 | ||
FR9509645A FR2737430B1 (en) | 1995-08-03 | 1995-08-03 | METHOD AND DEVICE FOR STARTING A CONTINUOUS CASTING MACHINE BETWEEN CYLINDERS |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0761343A1 true EP0761343A1 (en) | 1997-03-12 |
EP0761343B1 EP0761343B1 (en) | 2002-02-27 |
Family
ID=9481813
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96420255A Expired - Lifetime EP0761343B1 (en) | 1995-08-03 | 1996-07-25 | Method and apparatus for starting a continuous roll caster installation |
Country Status (12)
Country | Link |
---|---|
EP (1) | EP0761343B1 (en) |
JP (1) | JP3047162B2 (en) |
KR (1) | KR100301692B1 (en) |
AT (1) | ATE213676T1 (en) |
BR (1) | BR9603259A (en) |
CZ (1) | CZ230096A3 (en) |
DE (1) | DE69619445T2 (en) |
ES (1) | ES2172647T3 (en) |
FR (1) | FR2737430B1 (en) |
NO (1) | NO963204L (en) |
RU (1) | RU2153406C2 (en) |
TW (1) | TW317517B (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999010119A1 (en) * | 1997-08-27 | 1999-03-04 | Kaiser Aluminum & Chemical Corporation | Apparatus for adjusting the gap in a strip caster |
WO1999041031A1 (en) * | 1998-02-13 | 1999-08-19 | Pechiney Rhenalu | Aluminium alloy strips with high surface homogeneity and method for making same |
FR2775916A1 (en) * | 1998-03-13 | 1999-09-17 | Pechiney Rhenalu | Method and device for controlling the thickness profile of a thin metal strip |
WO2023192797A1 (en) * | 2022-03-30 | 2023-10-05 | Novelis Inc. | Automatic dam positioning systems and methods for controlling molten metal distribution to continuous casters |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AUPO591697A0 (en) * | 1997-03-27 | 1997-04-24 | Bhp Steel (Jla) Pty Limited | Casting metal strip |
KR100957038B1 (en) | 2007-12-21 | 2010-05-13 | 한국기계연구원 | A casting equipment for continuous strip |
DE102015114725B3 (en) * | 2015-09-03 | 2016-12-08 | Salzgitter Flachstahl Gmbh | Melt feed system for a horizontal strip caster |
CN108480577A (en) * | 2018-03-13 | 2018-09-04 | 闻喜县远华冶金材料有限公司 | The production method of casting magnesium alloy profiles |
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-
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- 1995-08-03 FR FR9509645A patent/FR2737430B1/en not_active Expired - Fee Related
-
1996
- 1996-07-23 TW TW085108957A patent/TW317517B/zh active
- 1996-07-25 ES ES96420255T patent/ES2172647T3/en not_active Expired - Lifetime
- 1996-07-25 DE DE69619445T patent/DE69619445T2/en not_active Expired - Fee Related
- 1996-07-25 EP EP96420255A patent/EP0761343B1/en not_active Expired - Lifetime
- 1996-07-25 AT AT96420255T patent/ATE213676T1/en not_active IP Right Cessation
- 1996-07-31 NO NO963204A patent/NO963204L/en unknown
- 1996-08-02 CZ CZ962300A patent/CZ230096A3/en unknown
- 1996-08-02 RU RU96115365/02A patent/RU2153406C2/en not_active IP Right Cessation
- 1996-08-02 BR BR9603259A patent/BR9603259A/en not_active IP Right Cessation
- 1996-08-03 KR KR1019960032729A patent/KR100301692B1/en not_active IP Right Cessation
- 1996-08-05 JP JP8220802A patent/JP3047162B2/en not_active Expired - Fee Related
Patent Citations (7)
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GB897412A (en) * | 1958-01-31 | 1962-05-30 | Pechiney | Continuous casting of metals and other fusible materials |
US3405757A (en) * | 1967-04-12 | 1968-10-15 | Harvey Aluminum Inc | Method and apparatus for continuous casting of metal between oppositely rotatable cooling rolls set generally one above the other |
FR2398565A1 (en) * | 1977-07-27 | 1979-02-23 | Scal Gp Condit Aluminium | LIQUID METAL FEED NOZZLE FOR CONTINUOUS TAPE CASTING MACHINE |
US4550767A (en) * | 1984-04-09 | 1985-11-05 | Aluminum Company Of America | Roll caster apparatus having uniform flow of molten metal into novel nozzle tip assembly |
EP0443204A1 (en) * | 1990-02-19 | 1991-08-28 | Lauener Engineering AG | Molten metal supplying means in a strip casting machine |
EP0596202A1 (en) * | 1992-10-06 | 1994-05-11 | Reynolds Metals Company | Adjustable flow control device for continuous casting of metal strip |
US5343932A (en) * | 1993-04-26 | 1994-09-06 | Reynolds Metals Company | System for feeding molten metal stream to continuous strand caster |
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WO1999010119A1 (en) * | 1997-08-27 | 1999-03-04 | Kaiser Aluminum & Chemical Corporation | Apparatus for adjusting the gap in a strip caster |
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WO2023192797A1 (en) * | 2022-03-30 | 2023-10-05 | Novelis Inc. | Automatic dam positioning systems and methods for controlling molten metal distribution to continuous casters |
Also Published As
Publication number | Publication date |
---|---|
ES2172647T3 (en) | 2002-10-01 |
KR100301692B1 (en) | 2001-11-22 |
BR9603259A (en) | 1998-04-28 |
CZ230096A3 (en) | 1997-02-12 |
JP3047162B2 (en) | 2000-05-29 |
DE69619445D1 (en) | 2002-04-04 |
FR2737430A1 (en) | 1997-02-07 |
TW317517B (en) | 1997-10-11 |
NO963204D0 (en) | 1996-07-31 |
NO963204L (en) | 1997-02-04 |
RU2153406C2 (en) | 2000-07-27 |
EP0761343B1 (en) | 2002-02-27 |
FR2737430B1 (en) | 1997-09-05 |
JPH09103851A (en) | 1997-04-22 |
DE69619445T2 (en) | 2002-10-24 |
ATE213676T1 (en) | 2002-03-15 |
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