EP3398699B1 - Méthode pour le réglage de la conicité d'un moule dans une machine de coulée continue et appareil pour ne machine de coulée continue - Google Patents

Méthode pour le réglage de la conicité d'un moule dans une machine de coulée continue et appareil pour ne machine de coulée continue Download PDF

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Publication number
EP3398699B1
EP3398699B1 EP18167470.6A EP18167470A EP3398699B1 EP 3398699 B1 EP3398699 B1 EP 3398699B1 EP 18167470 A EP18167470 A EP 18167470A EP 3398699 B1 EP3398699 B1 EP 3398699B1
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Prior art keywords
edge
mold
mould
central
measuring path
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EP18167470.6A
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German (de)
English (en)
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EP3398699A1 (fr
Inventor
Artemy Krasilnikov
Felix Max Fanghänel
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SMS Group GmbH
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SMS Group GmbH
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Priority claimed from DE102017213067.9A external-priority patent/DE102017213067A1/de
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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 invention relates to a method for adjusting the taper of a mold of a continuous casting plant, in particular a slab casting plant, during a casting process, comprising the steps: measuring temperature values along at least one central measuring path running in a casting direction along an adjustable arranged mold wall; and measuring temperature values along at least one edge-side measurement path running in a casting direction along the adjustably arranged mold wall, the edge-side measurement path running between the central measurement path and a side edge of the mold wall and a distance of the edge-side measurement path from this side edge of the mold wall being smaller than one Distance of the central measuring path to the other side edge of the mold wall.
  • the invention relates to a device for a continuous caster, in particular a slab caster, comprising: at least one mold with mutually opposite, adjustably arranged mold walls; at least one adjustment mechanism for adjusting the mold walls; at least one control electronics for controlling the adjustment mechanism; at least one central sensor device connected to the control electronics for measuring temperature values along at least one central measuring path running in a casting direction along one of the adjustably arranged mold walls; and at least one with the control electronics connected edge-side sensor device for measuring temperature values along at least one edge-side measurement path running in a casting direction along the adjustably arranged mold wall, the edge-side measurement path running between the central measurement path and a side edge of the mold wall and a distance of the edge-side measurement path from this side edge of the mold wall smaller is as a distance from the central measurement path to the other side edge of the mold wall.
  • a corresponding method and a corresponding device are out DE 10 2014 227 013 A1 known.
  • the strand width of a cast strand with adjustable mold walls can be set on opposite narrow sides of a mold.
  • the mold comprises a pouring passage which is continuous from an inlet end, via which a molten metal is poured into the mold, to an outlet end, from which a strand with a strand shell and a liquid core emerges, which cross section is perpendicular to a casting direction, which is the direction of the is defined by the molten metal flowing, has a rectangular shape.
  • the strand can be designed, for example, as a slab.
  • a volume loss occurs during cooling of the molten metal within the mold, which means that a cross-sectional area of the molten metal or the resulting strand at the inlet end of the mold is larger than a cross-sectional area of the molten metal or strand at the outlet end of the mold.
  • the casting passage of the mold is designed to be tapered in the casting direction.
  • the taper of the casting passage of the mold is usually determined by varying the inclinations of the mold walls which are adjustably arranged on opposite narrow sides set. Without such a conical design of the casting passage of the mold, the strand would no longer be guided in the lower region of the mold or in the region of the outlet end. Then controlled heat dissipation from the strand to the usually water-cooled mold walls is no longer possible.
  • the conicity of the casting passage of the mold is referred to as the conicity of the mold in the context of the present application.
  • Figure 1A shows a result with an optimal conicity of a mold 1.
  • a lateral section of the mold 1 is shown in cross section perpendicular to the casting direction, which has two opposing mold walls 2, each of which is assigned to a broad side of the mold 1.
  • the mold 1 has two oppositely arranged, adjustable mold walls 3, each of which is assigned to a narrow side of the mold 1 and of which in Figure 1A only one mold wall 3 is shown.
  • a strand 4 is guided through the mold 1 and has a strand shell 5 and a core 6 made of liquid metal. The strand 4 lies everywhere on the mold walls 2 and 3 and is thereby optimally guided and at the same time cooled by means of the mold walls 2 and 3.
  • Figure 1B shows a result when the taper of a mold 1 is too low.
  • the strand 4 or the strand shell 5 bulges on the narrow sides and, at the same time, the strand 4 flattens toward the edge, ie has a smaller thickness there than in a central region.
  • the edge of the strand 4 is no longer in full contact with the mold walls 2 and 3, so that the strand 4 is not optimally guided and is cooled unevenly by means of the mold walls 2 and 3.
  • Figure 1C shows a result when the taper of a mold 1 is too strong. This results in a bulge 6 on a narrow side surface of the strand 4 or the strand shell 5 and in longitudinal depressions 7 near the edge, the so-called rain gutters, on the broad sides of the strand 4. This results the narrow sides and the edge portions of the broad sides of the strand 4 are no longer in full contact with the mold walls 2 and 3, so that the strand 4 is not optimally guided and is cooled unevenly by means of the mold walls 2 and 3. Due to the insufficient cooling on the narrow sides of the strand 4, the strand shell 5 is not sufficiently strong on the narrow sides of the strand 4. This leads to the formation of bulges on the narrow sides of the strand 4 after the strand 4 emerges from the mold 1 and in a secondary cooling of a continuous casting plant.
  • An object of the invention is to improve the quality of a strand cast using a continuous casting plant.
  • the difference between the second surface under the edge-side temperature distribution curve and the first surface under the central temperature distribution curve can be used to determine whether there is an above-described curvature running in the longitudinal direction of the strand on the narrow side of the cast strand facing the adjustable mold wall , which is produced by an excessive taper of the mold and which would lead to the formation of a bulge on the narrow side of the strand after the strand exits the mold.
  • An indicator of the presence of such an arch is that the difference between the second surface and the first surface is a positive value. If it is detected that there is a bulge on the narrow side of the strand, the taper of the mold is reduced instead of - as is conventional - increased become.
  • the curvature on the narrow side is reduced or eliminated.
  • reducing the taper of the mold prevents the formation of marginal longitudinal depressions on the broad sides of the strand. Consequently, the entire surface of the strand can lie against the mold walls of the mold, as a result of which it is guided optimally and, to form a uniformly strong strand shell, is uniformly cooled by means of the, preferably water-cooled, mold walls. This reliably prevents the formation of a bulge on the narrow side of the strand emerging from the mold caused by the metal melt creeping within the strand. The creep of the molten metal within the strand is intensified in the area of the arching in that there is a coarsening of the structure there. Overall, a strand of higher quality can thus be produced.
  • the method according to the invention is carried out online, that is to say during the casting process. This enables an online adjustment of the taper of the mold, which means that the strand production process can be directly intervened and the production of rejects is considerably reduced.
  • the method according to the invention is based on the knowledge that the bulges on the narrow sides of a strand emerging from a mold can be caused by bulges on the narrow sides within the mold, which are produced by the conical mold being too strong, and that bulges produced in this way cannot be caused by a further reinforcement of the taper of the mold can be reduced or eliminated. In contrast to this, it has conventionally been assumed that the conicity of the mold must be increased if there are bulges on the narrow sides of the strand emerging from the mold, but this further deteriorates the quality of the strand.
  • the central measurement path runs in a central area, for example exactly in the middle, of the adjustably arranged mold wall, specifically in the Pouring direction, which in the context of the application is intended to mean that the central measuring path extends essentially parallel to a mathematical projection line, which is created by projecting the pouring direction perpendicular to the pouring direction onto the mold wall.
  • the fact that the central measurement path runs along the adjustably arranged mold wall should mean that the central measurement path extends over the entire length of the mold wall given in the casting direction or only over a part of this length.
  • the temperature measured values along the central measurement path are recorded at various measurement points along the central measurement path, the measurement points being spaced apart from one another in the longitudinal direction of the central measurement path.
  • each measuring point can be connected via a separate optical waveguide to a separate sensor arranged on the side, the signals of which allow a conclusion to be drawn about the temperature at the respective measuring point.
  • the signals from the sensors can be fed to evaluation electronics in order to be able to carry out the method according to the invention.
  • temperature measurement values are to be understood as directly measured temperature measurement values or temperature measurement values determined indirectly via another measured physical quantity, the measurement of the other physical quantity being referred to as measurement of the temperature measurement values in the context of the present application.
  • the central measurement path can run in a straight line or at least in sections curved or meandering.
  • two or more corresponding central measurement paths can also be provided on the adjustably arranged mold wall, along which temperature measurement values assigned to the respective central measurement path are recorded.
  • Temperature measurements along central measurement paths can be carried out on each of the two oppositely arranged, adjustable mold walls recorded and evaluated according to the inventive method. In this way, it can be detected on both adjustably arranged mold walls whether the strand in contact with them has a curvature running in the longitudinal direction in order to be able to adapt or optimize the conicity of the mold while taking this information into account.
  • the edge-side measurement path runs in an edge-side area, that is to say off-center, of the adjustably arranged mold wall, specifically in the pouring direction, which in the context of the application is intended to mean that the edge-side measurement path extends essentially parallel to a mathematical projection line which is through a projection the pouring direction perpendicular to the pouring direction on the mold wall.
  • the fact that the edge-side measurement path runs along the adjustably arranged mold wall should mean that the edge-side measurement path extends over the entire length of the mold wall given in the casting direction or only over part of this length.
  • the temperature measurement values along the edge-side measurement path are recorded at various measurement points along the edge-side measurement path, the measurement points being spaced apart from one another in the longitudinal direction of the edge-side measurement path.
  • each measuring point can be connected via a separate optical waveguide to a separate sensor arranged on the side, the signals of which allow a conclusion to be drawn about the temperature at the respective measuring point.
  • the signals from the sensors can be fed to the evaluation electronics in order to be able to carry out the method according to the invention.
  • the measurement path on the edge can run in a straight line or at least in sections curved or meandering.
  • two or more can also be arranged on the adjustably arranged mold wall there are corresponding edge-side measurement paths along which temperature measurement values associated with the respective edge-side measurement path are recorded. Temperature measurements along edge-side measurement paths can be recorded on each of the two oppositely arranged, arranged mold walls and evaluated according to the method according to the invention. In this way, it can be detected on both adjustably arranged mold walls whether the strand in contact with them has a curvature running in the longitudinal direction in order to be able to adapt or optimize the conicity of the mold while taking this information into account.
  • the central temperature distribution curve is generated from the temperature measurements along the central measurement path, either continuously or at discrete times during the casting process.
  • the central temperature distribution curve can be represented in a temperature measurement path diagram, the central measurement path being plotted on the abscissa axis, while the temperature is plotted on the ordinate axis.
  • the central temperature distribution curve can be determined by interpolating the measured temperature measured values along the central measurement path. The above-mentioned evaluation electronics can be used for this.
  • the edge-side temperature distribution curve is generated from the temperature measurements along the edge-side measurement path, either continuously or at discrete times during the casting process.
  • the temperature distribution curve on the edge can be represented in a temperature measurement path diagram, the measurement path on the edge being plotted on the abscissa axis, while the temperature is plotted on the ordinate axis.
  • the edge-side temperature distribution curve can be determined by interpolating the measured temperature measured values along the edge-side measurement path.
  • the above-mentioned evaluation electronics can be used for this.
  • the first area under the central temperature distribution curve can be determined by integrating a path-dependent temperature function that reproduces the central temperature distribution curve over the central measurement path.
  • the second area under the edge-side temperature distribution curve can be determined by integrating a path-dependent temperature function that reproduces the edge-side temperature distribution curve over the edge-side measurement path.
  • the difference between the second surface and the first surface is preferably determined by subtracting the first surface (subtrahend) from the second surface (minuend).
  • the first surface can serve as a measure of the heat currently dissipated from the strand centrally to the mold wall.
  • the second surface can serve as a measure of the heat currently dissipated from the strand to the mold wall at the edge.
  • the difference between the second surface and the first surface can be used to draw conclusions about the behavior of the strand against the respective adjustable mold wall. If, for example, the second surface, which indicates the heat dissipated on the edge of the mold wall, is larger than the first surface, which specifies the heat dissipated in the center of the mold wall, it can be concluded that on the respective narrow side of the strand there is a one running in the longitudinal direction of the strand There is a bulge or that the strand is not in contact with the mold wall in the region of the bulge. The taper of the mold can then be reduced taking into account the positive difference between the second surface and the first surface.
  • the second area is smaller than the first area, it can be concluded that the edges of the respective narrow side of the strand are not in contact with the mold wall.
  • the taper of the mold can then be increased taking into account the negative difference between the second surface and the first surface. If the second surface is equal to the first surface, it can be concluded that the strand is in full contact with the mold walls everywhere. Then the taper of the chill can go under Taking into account the difference with the value ⁇ 0 between the second surface and the first surface.
  • the taper of the mold is increased if the difference is a negative value that is less than a predetermined negative minimum value, that the taper of the mold is reduced if the difference is a positive value that is greater than is a predetermined positive minimum value, and that the taper of the mold is maintained if the difference lies in an open interval, the upper limit of which is the positive minimum value and the lower limit of which is the negative minimum value.
  • the positive minimum value and the negative minimum value can be zero or differ only slightly from zero.
  • the taper of the mold is varied more the more the difference is different from zero.
  • the greater the difference the clearer it is that the narrow side of the strand is partially in contact with the adjustably arranged mold wall and partly at a large distance from the mold wall, so that there is a considerable misadjustment of the conicity of the mold. This then requires a greater variation in the taper of the mold.
  • the device can be used for the automated implementation of the method according to one of the above-mentioned configurations or any combination of at least two of these configurations with one another.
  • the oppositely arranged, adjustably arranged mold walls are preferably arranged on the narrow sides of the mold.
  • the conicity of the mold can be varied by adjusting the opposite walls.
  • the adjustment of the opposing mold walls includes in particular the adjustment of the angle of inclination of the mold walls.
  • the adjustment mechanism for adjusting the mold walls can be hydraulic or electromechanical, for example. If the mold walls of the narrow sides are clamped between the mold walls on the broad sides of the mold, the mold walls on the broad sides of the mold can first be relieved to adjust the mold walls on the narrow sides in order to reduce the clamping forces. Then the mold walls on the narrow sides can be adjusted and then the mold walls on the broad sides can be reset to the original clamping force.
  • the central sensor device and the edge-side sensor device can each be straight or elongated and preferably extend in the casting direction.
  • Each sensor device comprises a plurality of sensors which can be connected indirectly to the respective mold wall via optical waveguides, which can have fiber Bragg gratings, or directly.
  • the so-called fiber Bragg grids allow the use of the Wavelength division multiplexing. This means that many sensors with different Bragg wavelengths can be implemented along and in one optical fiber. A field of several dozen to a hundred sensors can be realized in this way without having to equip the mold walls with many individual point-shaped sensors, which would be technically very complex, would possibly unduly weaken the structure of the mold, and also due to manufacturing-related deviations in the penetration depths of the individual sensors could lead to inaccuracies in the measurement.
  • optical fibers with an integrated fiber Bragg grating are extremely suitable.
  • the sensor devices are connected to the control electronics and deliver their measurement signals to them.
  • the control electronics can thus have a one-dimensional or multidimensional temperature field and / or heat flow density field, from which the control electronics can calculate the contact behavior of the strand on the mold.
  • the control electronics is also connected to the adjustment mechanism and set up to control it, so that one or more adjustably arranged mold walls can be set according to the determined contact behavior of the strand.
  • control electronics are set up to increase the conicity of the mold by actuating the adjustment mechanism if the difference is a negative value, which is smaller than a predetermined negative minimum value, to reduce the conicity of the mold by actuating the adjustment mechanism, if the difference is a positive value that is greater than a predetermined positive minimum value, and to maintain the taper of the mold without actuating the adjustment mechanism if the difference lies in an open interval, the upper limit of which is the positive minimum value and the lower limit of which is the negative minimum value ,
  • control electronics are set up to vary the conicity of the mold by controlling the adjustment mechanism, the more the difference is different from zero.
  • Figures 1A to 1D each show a device 32 for a continuous caster, not shown, in particular slab caster.
  • the device 32 comprises a mold 1 with oppositely arranged, adjustably arranged mold walls 3 arranged on the narrow sides of the mold 1, of which in the Figures 1A to 1D only one is shown, and arranged on broad sides of the mold 1 mold walls 2, between which the mold walls 3 are clamped during a casting process.
  • the device 32 comprises an adjustment mechanism (not shown) for adjusting the mold walls 3 and control electronics (not shown) for actuating the adjustment mechanism.
  • the device 32 comprises a first central sensor device 24 connected to the control electronics for measuring temperature values along a first central measurement path running in a casting direction running transversely to the plane of the drawing along the mold wall 3 arranged in an adjustable manner, and a second central sensor device (not shown) connected to the control electronics Measuring temperature values along a second central measurement path running in the casting direction along the further, arranged, arranged mold wall, which is not shown.
  • the device 32 comprises two edge-side sensor devices 27 and 28 connected to the control electronics for measuring temperature values along a respective edge-side measurement path that runs in the casting direction along the adjustable mold wall 3, each edge-side measurement path between the central measurement path and a lateral edge of the mold wall 3 runs and a distance of the respective edge-side measurement path to this side edge of the mold wall 3 is smaller than a distance of the center measurement path to the other side edge of the mold wall 3.
  • the device 32 comprises two edge-side sensor devices (not shown) connected to the control electronics for measuring Temperature values along in each case an edge-side measurement path running in the casting direction along the further mold wall, which is arranged so as to be adjustable, each edge-side measurement path between the central measurement path and a lateral R runs on the mold wall and a distance of the respective edge-side measurement path to this side edge of the mold wall is smaller than a distance of the central measurement path to the other side edge of the mold wall.
  • the control electronics is set up to determine a central temperature distribution curve along the respective central measurement path from the temperature values measured along the respective central measurement path. Furthermore, the control electronics are set up to determine an edge-side temperature distribution curve along the respective edge-side measurement path from the temperature values measured along the respective edge-side measurement path. In addition, the control electronics are set up to determine a first surface under the respective central temperature distribution curve and a second surface under the respective edge-side temperature distribution curve. Furthermore, the control electronics are set up to determine a difference between the second surface and the respective first surface for each mold wall 3. Furthermore, the control electronics are set up to adjust the taper of the mold 1 taking into account the differences.
  • the control electronics is set up to increase the taper of the mold 1 if the respective difference is a negative value that is less than a predetermined negative minimum value, to decrease the taper of the mold 1 if the respective difference is a positive value that is greater than is a predetermined positive minimum value, and to maintain the taper of the mold 1 if the respective difference lies in an open interval, the upper limit of which is the positive minimum value and the lower limit of which is the negative minimum value.
  • the control electronics are set up to vary the conicity of the mold 1 the more the respective difference is different from zero.
  • Figure 2 shows a diagram which shows a narrow side shape 8 of a cast strand inside a mold with too much conicity and a narrow side shape 9 of the strand outside the mold.
  • the distance along the narrow side from a broad side of the strand is plotted on the ordinate.
  • the deviation from an ideal narrow side shape is plotted on the abscissa.
  • the narrow side shape 8 is designed as a concave curvature, which is generated by an excessive conicity of the mold. In a central region of the narrow side mold 8, there is therefore no contact with a mold wall on a narrow side, as a result of which the strand has a strand shell on the narrow side, the thickness of which decreases in the direction of the center of the narrow side.
  • this bulging of the narrow sides can be prevented by detecting whether there is a corresponding bulge on a narrow side of the strand within the mold and, if the bulge is present, the conicity of the mold is reduced becomes.
  • Figure 3 12 shows a diagram showing a central temperature distribution curve 11 and an edge-side temperature distribution curve 12. The distance along the narrow side from a broad side of the strand is plotted on the ordinate. The temperature is plotted on the abscissa.
  • the surfaces 13, 14 and 15 are present between the temperature distribution curves 11 and 12 and represent the respective difference between the second temperature distribution curve 12 and the first temperature distribution curve 11.
  • the surfaces 13 and 15 are assigned a negative difference, while the surface 14 is assigned a positive difference. This shows that usually even with an optimal conicity of the mold in the entrance area of the mold there is too little conicity (see area 13), while in an adjoining area of the mold there can be too much conicity (see area 14 ). This can be detected with the method according to the invention or with the device according to the invention.
  • Figure 4 shows a schematic representation of an embodiment of a device 17 according to the invention for a continuous casting plant, not shown, in particular slab casting plant.
  • the device 17 comprises a mold with opposing, adjustably arranged mold walls 19 and 20, which are arranged on the narrow sides of the mold 18.
  • the associated mold walls on the broad sides of the mold 18 are not shown.
  • the device 18 comprises an adjustment mechanism 21 for adjusting the mold walls 19 and 20.
  • the adjustment mechanism 21 comprises two actuators 22 for each adjustable mold wall 19 or 20, the actuation of which allows the angle of inclination of the respective mold wall 19 or 20 to be varied.
  • the device 17 includes control electronics 23 for controlling the adjustment mechanism 21.
  • the control electronics 23 are connected to the actuators 22 in terms of signal technology.
  • the device 17 also includes a first central sensor device 24 connected to the control electronics 23 for measuring temperature values along a first central measurement path running in a casting direction indicated by the arrow 25 along the mold wall 19 arranged in an adjustable manner, and a second central sensor device 26 connected to the control electronics 23 for measuring temperature values along a second central measuring path running in the pouring direction indicated by arrow 25 along the mold wall 20 which is arranged to be adjustable.
  • the device 17 comprises two edge-side sensor devices 27 and 28 connected to the control electronics 23 for measuring temperature values along a respective edge-side measurement path running in the casting direction along the mold wall 19 arranged in an adjustable manner, each edge-side measurement path between the central measurement path and a lateral edge of the mold wall 19 runs and a distance of the respective edge-side measurement path to this side edge of the mold wall 19 is smaller than a distance of the center measurement path to the other side edge of the mold wall 19.
  • the device 17 comprises two edge-side sensor devices 29 and 30 connected to the control electronics 23 Measuring temperature values along in each case an edge-side measurement path running in the casting direction along the adjustably arranged mold wall 20, each edge-side measurement path between the central measurement path and a lateral edge of the mold nd 20 runs and a distance of the respective edge-side measurement path to this side edge of the mold wall 20 is smaller than a distance of the central measurement path to the other side edge of the mold wall 20.
  • the control electronics 23 is set up to determine a central temperature distribution curve along the respective central measurement path from the temperature values measured along the respective central measurement path. Furthermore, the control electronics 23 are set up to determine an edge-side temperature distribution curve along the respective edge-side measurement path from the temperature values measured along the respective edge-side measurement path. In addition, the control electronics are set up to determine a first surface under the respective central temperature distribution curve and a second surface under the respective edge-side temperature distribution curve. Furthermore, the control electronics 23 are set up to determine a difference between the second surface and the respective first surface for each mold wall 19 or 20. Furthermore, the control electronics 23 are set up to adjust the taper of the mold 18 taking into account the differences.
  • the control electronics 23 are set up to increase the taper of the mold 18 by actuating the adjusting mechanism 21 if the respective difference, a negative value that is smaller than a predetermined negative minimum value, reduces the taper of the mold 18 by actuating the adjusting mechanism 21 , if the respective difference is a positive value which is greater than a predetermined positive minimum value, and to maintain the taper of the mold 18 without actuation of the adjusting mechanism 21, if the respective difference lies in an open interval, the upper limit of which is the positive minimum value and lower limit is the negative minimum value.
  • the control electronics 23 are set up to vary the conicity of the mold 18 by controlling the adjusting mechanism 21, the more the respective difference is different from zero.

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  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Claims (6)

  1. Procédé destiné au réglage d'une conicité d'une lingotière (1; 18) d'une installation de coulée continue, en particulier d'une installation de coulée continue de brames, au cours d'un processus de coulée, présentant les étapes dans lesquelles :
    - on mesure des valeurs de température le long d'au moins un chemin central de mesure s'étendant dans une direction de coulée le long d'une paroi de lingotière (3 ; 19 ; 20) disposée de manière à pouvoir être déplacée ;
    - on mesure des valeurs de température le long d'au moins un chemin marginal de mesure s'étendant dans une direction de coulée le long de la paroi de lingotière (3 ; 19 ; 20) disposée de manière à pouvoir être déplacée ; dans lequel le chemin marginal de mesure s'étend entre le chemin central de mesure et un bord latéral de la paroi de lingotière (3 ; 19 ; 20) et une distance du chemin marginal de mesure par rapport à ce bord latéral de la paroi de lingotière (3 ; 19 ; 20) est inférieure à une distance du chemin central de mesure à l'autre bord latéral de la paroi de lingotière (3 ; 19 ; 20) ;
    caractérisé par les étapes dans lesquelles :
    - on détermine une courbe de distribution de températures centrales le long du chemin central de mesure à partir des valeurs de température mesurées le long du chemin central de mesure ;
    - on détermine une courbe de distribution de températures marginales le long du chemin marginal de mesure à partir des valeurs de température mesurées le long du chemin marginal de mesure ;
    - on détermine une première superficie en dessous de la courbe de distribution de températures centrales et une seconde superficie en dessous de la courbe de distribution de températures marginales ;
    - on détermine une différence entre la seconde superficie et la première superficie ; et
    - on règle la conicité de la lingotière (1; 18) en prenant compte la différence.
  2. Procédé selon la revendication 1, caractérisé en ce qu'on augmente la conicité de la lingotière (1 ; 18) lorsque la différence représente une valeur négative qui est inférieure à une valeur minimale négative prédéfinie ; en ce qu'on diminue la conicité de la lingotière (1; 18) lorsque la différence représente une valeur positive qui est supérieure à une valeur minimale positive prédéfinie ; et ce qu'on maintient la conicité de la lingotière (1; 18) lorsque la différence se situe dans un intervalle ouvert dont la limite supérieure représente la valeur minimale positive et dont la limite inférieure représente la valeur minimale négative.
  3. Procédé selon la revendication 2, caractérisé en ce que la variation de la conicité de la lingotière (1; 18) sera proportionnelle à l'importance de la différence par rapport à zéro.
  4. Dispositif (17, 32) destiné à une installation de coulée continue, en particulier une installation de coulée continue de brames, présentant :
    - au moins une lingotière (18) comprenant des parois de lingotière opposées (19, 20) disposées de manière à pouvoir être déplacées ;
    - au moins un mécanisme de déplacement (21) pour le déplacement des parois de lingotière (19, 20) ;
    - au moins une électronique de commande (23) pour la commande du mécanisme de déplacement (21) ;
    - au moins un mécanisme central de détection (24, 26) relié à l'électronique de commande (23) destiné à mesurer des valeurs de température le long d'au moins un chemin central de mesure s'étendant dans une direction de coulée le long d'une paroi de lingotière (19 ; 20) disposée de manière à pouvoir être déplacée ;
    - au moins un mécanisme marginal de détection (27, 28, 29, 30) relié à l'électronique de commande (23) destiné à mesurer des valeurs de température le long d'au moins un chemin marginal de mesure s'étendant dans une direction de coulée le long d'une paroi de lingotière (19 ; 20) disposée de manière à pouvoir être déplacée; dans lequel le chemin marginal de mesure s'étend entre le chemin central de mesure et un bord latéral de la paroi de lingotière (19 ; 20) et une distance du chemin marginal de mesure par rapport à ce bord latéral de la paroi de lingotière (19 ; 20) est inférieure à une distance du chemin central de mesure à l'autre bord latéral de la paroi de lingotière (19 ; 20) ;
    caractérisé en ce que l'électronique de commande (23) est conçue
    - pour déterminer une courbe de distribution de températures centrales le long du chemin central de mesure à partir des valeurs de température mesurées le long du chemin central de mesure ;
    - pour déterminer une courbe de distribution de températures marginales le long du chemin marginal de mesure à partir des valeurs de température mesurées le long du chemin marginal de mesure ;
    - pour déterminer une première superficie en dessous de la courbe de distribution de températures centrales et une seconde superficie en dessous de la courbe de distribution de températures marginales ;
    - pour déterminer une différence entre la seconde superficie et la première superficie ; et
    - pour régler la conicité de la lingotière (18) en prenant compte la différence.
  5. Dispositif (17, 32) selon la revendication 4, caractérisé en ce que l'électronique de commande (23) est conçue pour augmenter la conicité de la lingotière (18) par l'intermédiaire d'une commande du mécanisme de déplacement (21) lorsque la différence représente une valeur négative qui est inférieure à une valeur minimale négative prédéfinie ; pour diminuer la conicité de la lingotière (18) par l'intermédiaire d'une commande du mécanisme de déplacement (21) lorsque la différence représente une valeur positive qui est supérieure à une valeur minimale positive prédéfinie ; et pour maintenir la conicité de la lingotière (18) en l'absence d'une activation du mécanisme de déplacement (21) lorsque la différence se situe dans un intervalle ouvert dont la limite supérieure représente la valeur minimale positive et dont la limite inférieure représente la valeur minimale négative.
  6. Dispositif (17, 32) selon la revendication 5, caractérisé en ce que l'électronique de commande (23) est conçue pour régler la variation de la conicité de la lingotière (18) par l'intermédiaire d'une commande du mécanisme de déplacement (21) de manière proportionnelle à l'importance de la différence par rapport à zéro.
EP18167470.6A 2017-05-03 2018-04-16 Méthode pour le réglage de la conicité d'un moule dans une machine de coulée continue et appareil pour ne machine de coulée continue Active EP3398699B1 (fr)

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DE102017207374 2017-05-03
DE102017213067.9A DE102017213067A1 (de) 2017-05-03 2017-07-28 Verfahren zum Einstellen einer Konizität einer Kokille einer Stranggießanlage und Vorrichtung für eine Stranggießanlage

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DE3423475C2 (de) * 1984-06-26 1986-07-17 Mannesmann AG, 4000 Düsseldorf Verfahren und Einrichtung zum Stranggießen von flüssigen Metallen, insbesondere von flüssigem Stahl
DE3908328A1 (de) * 1989-03-10 1990-09-13 Mannesmann Ag Einrichtung zur regelung der konizitaet
DE4117073A1 (de) * 1991-05-22 1992-11-26 Mannesmann Ag Temperaturmessung brammenkokille
DE102014227013A1 (de) 2014-09-18 2016-03-24 Sms Group Gmbh Verfahren und Vorrichtung zur Optimierung der Konizität einer Kokille in einer Brammenstranggießanlage

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