EP3173166B1 - Procédé et dispositif de réglage de la largeur d'une barre métallique coulée en continu - Google Patents

Procédé et dispositif de réglage de la largeur d'une barre métallique coulée en continu Download PDF

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Publication number
EP3173166B1
EP3173166B1 EP16200278.6A EP16200278A EP3173166B1 EP 3173166 B1 EP3173166 B1 EP 3173166B1 EP 16200278 A EP16200278 A EP 16200278A EP 3173166 B1 EP3173166 B1 EP 3173166B1
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EP
European Patent Office
Prior art keywords
width
continuous casting
metal strip
mould
model
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EP16200278.6A
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German (de)
English (en)
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EP3173166A1 (fr
Inventor
Uwe Plociennik
Thomas Heimann
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SMS Group GmbH
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SMS Group GmbH
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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
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/05—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds into moulds having adjustable walls

Definitions

  • the invention relates to a method for adjusting the width of a continuously cast by a mold metal strand in a continuous casting plant according to the preamble of claim 1, and a corresponding device according to the preamble of claim 17.
  • the width B of a metal strand can be adjusted with adjustable narrow sides of the mold.
  • the metal strand In the area of secondary cooling, ie below or downstream of the mold, the metal strand is guided by means of rollers arranged parallel to the broad side of the strand. This ensures the thickness d of the metal strand.
  • the narrow sides of the metal strand have in the area below the mold usually a short support, consisting of only a few pairs of rollers following this support begins the spreading of the metal strand .. Due to the ferrostatic pressure, the metal strand spreads and bulges thus in the area below the mold in the width direction, ie transverse to the casting direction. The spread of the metal strand can reach several percent of the nominal width.
  • the Japanese patent application JP S 61232049 discloses a method for adjusting the width of a continuous casting mold. Specifically, the target width of the mold, the changes in the mold width at the beginning and at the end of a continuous casting process and the casting speed is input as a parameter into a computing unit, which calculates suitable manipulated variables for actuators for setting the mold width from these input parameters. This allows high-speed casting, in which the variations in the mold width are reduced, even if otherwise the mold width varies greatly during continuous casting.
  • EP 2 762 251 B1 discloses a method for casting a metal strand, in which a width correction for the metal strand is calculated as a function of a determined volumetric flow difference from the measured actual value and the measured nominal value of the volume flow of a liquid metal in a regulator, taking into account the thickness of the metal strand to be cast and the casting speed , Subsequently, the calculated width correction is output as a manipulated variable to an actuator for adjusting at least one narrow side of the continuous casting mold, so that there is a change in the width B of the metal strand to be cast.
  • a disadvantage of the method according to EP 2 762 251 B1 is that for this purpose the knowledge of the volume flow of the liquid metal is necessary, which makes a corresponding flow sensor or the like required at an outlet opening of the continuous casting mold.
  • EP 0 947 265 A2 discloses a generic method having the features of the preamble of claim 1, and a generic device having the features of the preamble of claim 17.
  • the invention has for its object to optimize the continuous casting of a metal strand to the effect that by a suitable setting of Narrow sides of the continuous casting mold as accurate as possible width tolerance for the metal strand, especially at the end of the continuous casting is guaranteed.
  • a method according to the present invention is for adjusting the width of a continuously cast by a mold metal strand in a continuous casting plant.
  • a width correction for the metal strand is calculated and output as a manipulated variable for adjusting at least one narrow side of the mold.
  • Based on a Breitungsmodells is calculated by a computing device, the width of the metal strand or a slab formed therefrom at the end of the continuous casting taking into account at least one calculation parameter and compared with a predetermined setpoint, wherein at least one narrow side of the mold depending on the calculated width for the end of the continuous casting of the metal strand is set.
  • both narrow sides of the mold are set here.
  • the adjustment of the at least one narrow side of the mold can be made regulated, for which purpose a corresponding control circuit is set up in the computing device.
  • a width of the metal strand or a slab formed therefrom is determined at at least one measuring point, using a measuring device suitable for this purpose.
  • the measuring point is located at a predetermined and preferably small distance from the outlet opening of the mold, namely within the strand guide of a continuous casting in its upper part, preferably at a distance of 4 - 12 meters to the exit opening of the mold. More preferably, this distance can also be 5-8 meters.
  • the width of a continuously cast metal strand, or the width of slabs formed therefrom determined by a bulge of the narrow side and the spread of the metal strand within the strand guide, as well as by the thermal Shrinkage of the metal strand from the pouring mirror until it reaches room temperature.
  • the cause of the change in width of the continuously cast metal strand lies in the ferrostatic load of the liquid melt in the interior of the metal strand.
  • the tendency of the increase of a width due to the ferrostatic load is substantially greater than the counteracting shrinkage, which results from the density change of the metal strand as a result of its temperature decrease or -kühlkühlung.
  • the spreading of a continuously cast metal strand or slab formed therefrom i. the resulting width in the fully solidified state compared to the width at which the metal strand leaves the exit opening of the mold, depending on the type of steel used.
  • the spread is greater than the shrinkage, except for very hard steels (e.g., C100) where this is reversed.
  • the spread is strongly dependent on the geometry of the metal strand. This manifests itself in the fact that thick metal strands have a much stronger preparation than thin metal strands.
  • the invention is based on the essential finding that it is possible with the calculation based on the Breitungsmodells to determine the actual width of the metal strand or a slab formed therefrom, which adjusts itself at the end of the continuous casting, exactly.
  • the calculation in the Breitungsmodell takes place in dependence on at least one calculation parameter, which may be a process parameter of the casting process and / or a material-specific size.
  • a control signal is generated by the computing device, with which an actuator is controlled, which with the at least one narrow side of the mold is in operative connection. As a result, then said setting of the mold narrow side.
  • end of the continuous casting plant is also to be understood in terms of time. In other words, this is a time when the metal strand or one formed from it Slab is completely cooled, in which case no further change in the width of the cast product occurs. In this regard, it is irrelevant whether the metal strand is already separated into a slab. In any case, with the Breitungsmodell according to the present invention, a resulting width of the metal strand or a slab formed therefrom is calculated, namely for a time when the metal strand or the slab have cooled so far that their width assumes a constant value.
  • the width of the metal strand or a slab formed therefrom can be calculated exactly at the end of the continuous casting.
  • a measurement of the width of the metal strand or a slab by a measuring device is not necessary here.
  • the possibly variable boundary conditions during the continuous casting process e.g. As a result of using another type of steel, changing the geometry of the metal strand or changing the cooling conditions or the like, can be detected solely by the at least one calculation parameter, depending on the Breitungsmodell the width of the metal strand or a slab is calculated.
  • the spreading of the metal strand or a slab formed therefrom is calculated in the Breitungsmodell as a function of at least one calculation parameter, this calculation parameter at least the physical properties of the material of the metal strand, the temperature of the metal in the mold, the casting speed of the metal strand, the overheating and / or the geometry of the metal strand comprises.
  • this one calculation parameter can be determined during the continuous casting process in real time ("online"), whereby rapid reactions to possible process changes are ensured.
  • the employment of the mold narrow side is thus based on the Breitungsmodells, for which, inter alia, the temperature measurements in the narrow sides of the mold and the heat flows discharged via the Kokillenkühlement can be considered for all Kokilleneat.
  • the water supply to the mold narrow sides can be predetermined for the secondary cooling.
  • the measuring point at which the width of the metal strand or a slab formed therefrom is determined using a measuring device suitable for this purpose, additionally also be arranged at the end of the continuous casting or outside thereof.
  • the width at the measuring point By measuring the width at the measuring point, it is thus possible to determine the width of the metal strand or a slab formed therefrom, i. the change in the width of the metal strand or a slab at this measuring point in comparison to the width of the metal strand has at the outlet opening of the mold determined.
  • the resulting measured value, which is recorded at the at least one measuring point is then passed to the computing device, and then taken into account for the calculation with the Breitungsmodell.
  • the measured value which is recorded by the measuring device at the measuring point for the width of the metal strand or a slab formed therefrom then serves as a further calculation parameter for the calculation in the spreading model.
  • the Breitungsmodell comprises a thermodynamic model and a mathematical-physical model, these models are coupled together. Specifically, by means of the thermodynamic model, temperatures and strand shell thicknesses of the metal strand are determined at each position of the metal strand in the continuous casting plant. By means of the mathematical - physical model, a creep of the metal strand is determined. Preferably, the values calculated by the thermodynamic model for the subsequent calculation by the mathematical-physical model are taken into account here.
  • the thermodynamic model to the mathematical-physical model, it is possible to calculate the spread for the metal strand or slab formed therefrom, based on this and, as explained, taking into account a predetermined target value for the width at least to set a narrow side of the mold.
  • a narrow side of the mold is understood that either a distance of this narrow side on their Whole length is changed with respect to the opposite narrow side of the mold, ie increased or decreased, wherein an angle of the surface of this narrow side remains unchanged with respect to the vertical.
  • a surface of this at least one narrow side of the mold in the course of said setting can also be changed with respect to a vertical, whereby the angle of the surface of this narrow side is changed with respect to the vertical.
  • the narrow side is "tilted” with respect to the vertical. This is also referred to as "taping" in the field of continuous casting.
  • the present invention it is possible, the always occurring in the continuous casting of a metal strand in the course of continuous casting propagation by calculating the width, which is expected at the end of the continuous casting, and a corresponding adjustment of the width of the mold, ie by changing the distance the narrow sides of the mold, suitable to compensate, so that in particular at the end of the continuous casting, if there is already cooled, the metal strand, to ensure an accurate measure of the width of the cooled metal strand.
  • the further advantage that the setting of at least one narrow side of the mold during the production process z. B. to changed process parameters and / or other materials from which the metal strand is poured, can be adjusted. This then leads to considerable material savings and to a shortened production time.
  • a computing device for the calculation of the width of the metal strand at the end of the continuous casting a computing device is provided, which is provided with the Breitungsmodell, wherein the width, which has been calculated for the metal strand at the end of the continuous casting, is then compared by means of the computing device with a predetermined target value. Based on this and depending on the calculated for the end of the continuous casting width of the metal strand is then set as explained above, the at least one narrow side of the mold. It is advantageous in this case if the computing device is operated in such a way that the setting of the at least one narrow side of the mold is regulated as a function of the calculated width for the end of the continuous casting machine, ie. H. by providing a corresponding control loop in the computing device. Such a regulation of the employment of the at least one narrow side can react very quickly to changes during the production process during the continuous casting of a metal strand, for example to changed temperatures of the molten metal and / or to changed casting speeds.
  • state changes of the entire metal strand in a thermodynamic model are calculated in a mathematical simulation model, including a heat conduction equation. On the basis of this, it is then possible to draw conclusions about the temperature of the metal strand along the continuous casting plant, and thus in the casting direction of the metal strand.
  • the Breitungsmodell preferably formed by a coupling of a thermodynamic model with a mathematical-physical model, and the information about the casting process, the course of the propagation of the metal strand within the strand guide and in particular for the end of a continuous casting plant can be calculated with great accuracy.
  • process changes such as the casting temperature or casting speed or the secondary cooling and immediately initiate a width adjustment of the mold. This is ensured by calculating the differential changes for the occurring process variations in the Breitungs model. If such process changes occur, you can now very quickly the change of the expected width to the width adjustment as "pre-control" will be conducted.
  • the adjustment of the at least one narrow side of the mold can also be effected as a function of the temperature of the molten metal within the mold.
  • the temperature of the metal within the mold is detected by the temperature of at least one side wall of the mold, preferably characterized in that drawn by the heat flows through the Kokillenkühlement on at least one Kokillenseite a conclusion on the temperature of the liquid metal within the mold.
  • the width of the metal strand in individual cross-sectional segments along the casting direction can be calculated on the basis of the Breitungsmodells.
  • the strains that are transverse to the casting direction for the individual cross-sectional segments of the metal strand d. H. set in a width of the metal strand, added up, and then calculated on the basis of which or the width of the metal strand or the width of the end of the continuous casting or determined.
  • the Breitungsmodell or its mathematical-physical model, take into account a creep.
  • the so-called simplified Garofalo creep approach is suitable or proven.
  • the Breitungsmodell is generally a creep for the secondary creep in the solidified part of the metal strand suitable.
  • material-specific parameters of the metal strand and / or the process temperature of the metal strand are when using the Breitungsmodells and Kriechensatzes for secondary creep during continuous casting. This is preferably done "on-line” and thus in real-time during the continuous casting process to allow for rapid adjustments to eventual process changes.
  • a shrinkage of the metal strand along the casting direction can be taken into account in the Breitungsmodell.
  • its shrinkage can preferably be calculated in individual cross-sectional segments along the casting direction, which leads to a high degree of accuracy of calculation.
  • a setting and / or pitch for the at least one narrow side of the mold can be determined on the basis of the Breitungsmodells. This is particularly advantageous for a planned change in the casting speed with which the metal strand is cast.
  • the employment of the at least one narrow side of the mold, and possibly also the employment speed selected for this purpose can be calculated as a function of an overheating of the liquid metal, a secondary cooling and / or an analysis change.
  • the temperature of the melt or the liquid metal within the mold or in the upstream Thundish be permanently determined or calculated by means of a ladle and distributor model. By temporary temperature measurements of the melt in the pan or in a distributor, the ladle and distributor model is adapted.
  • an apparatus for adjusting the width of a continuous metal casting by a mold in a continuous casting machine comprising a computing device in which a latitudinal model is set up and based on which, depending on at least one calculation parameter, the width the metal strand or a slab formed therefrom is calculated at the end of the continuous casting plant and compared with a predetermined desired value, wherein the computing device subsequently generates a control signal.
  • the device further comprises an actuator which is in operative connection with at least one narrow side of the mold and which can be actuated by the actuating signal to at least one Set narrow side of the mold, and at least one measuring device with which a width of the metal strand or a slab formed therefrom at a measuring point, which is arranged at a predetermined distance from the outlet opening of the mold, can be measured.
  • This measuring device is disposed within the strand guide of the continuous casting in the upper part and preferably at a short distance from Kokillenunterkante. This leads to a further improved accuracy with respect to the determination of the spread of the metal strand or a slab formed therefrom.
  • At least one measuring device can also be arranged at the end of the continuous casting plant or outside thereof.
  • two measuring devices are provided, of which one as described within the strand guide, and the other at the end of the continuous casting or are arranged outside thereof.
  • Another advantage of such a measuring device arises in the case when along the continuous casting unforeseen disturbances such. with the cooling water supply or similar should occur - by the measuring device, in particular in an arrangement at the end of the continuous casting or outside of it, then it is possible in such a fault case to measure the actual width of the metal strand or a slab formed therefrom at the end of the continuous casting process, then at least as explained adjust a narrow side in the mold accordingly. In this way, the disturbances can then be compensated, at least temporarily, for example in order to obtain e.g. finish a production cycle in an orderly manner.
  • the present invention aims to calculate the resulting expansion of a continuously cast metal strand, possibly also taking into account its shrinkage, in particular for the end of a continuous casting plant, in order to adjust at least one narrow side of a mold of the continuous casting plant accordingly. This is particularly important in the case when the width of the metal strand or of slabs formed therefrom after cooling must be within a narrow tolerance specified by the customer.
  • the temperature distribution for a continuously cast metal strand depends, inter alia, on the enthalpy curve, which can be calculated, for example, on the basis of Gibbs energies.
  • This temperature distribution is in the diagram of Fig. 1 represented, namely over the strand length and as a function of the distance from the casting mirror. In each case, the temperatures in the strand center are shown on the surface and in the core. In addition, the average temperature is shown. The solidus and liquidus lines indicate where solidification of the metal strand occurs.
  • the calculation of the temperature distribution, as in the diagram of Fig. 1 shown with the help of Gibbs energy can with a Procedures are carried out which DE 10 2011 082 158 A1 is known.
  • the temperature distribution which prevails inside a continuously cast metal strand is calculated by means of a temperature calculation model based on a dynamic temperature control, for example the DSC ( Dynamic Solidification Control) .
  • the total enthalpy can be calculated from the sum of the free molar enthalpy (Gibbs energies) of all present in the material of the metal strand existing phases and / or phase components.
  • Fig. 2 shows in a simplified schematic representation of a continuous casting plant 20 for continuous casting of a metal strand 10, with this continuous casting 20, a method according to the invention can be performed.
  • the continuous casting plant 20 is equipped with a computer device 120 or computing device, wherein this computing device 120 is equipped with a temperature calculation model designed as a metallurgical process model, which has or is based on a temperature control.
  • the temperature calculation model for example the DSC ( Dynamic Solidification Control) already mentioned above, the temperature distribution prevailing inside a metal strand cast from liquid metal can be calculated.
  • the aforementioned metallurgical process model is part of a spreading model BM that is set up in the computing device 120.
  • the Breitungsmodell BM includes both a thermodynamic model TM for determining the temperatures and the strand shell thicknesses of the metal strand 10 and a mathematical-physical model MPM for determining the creep of the metal strand 10, wherein the models TM and MPM are coupled together ( Fig. 3 ).
  • the metal strand 10 has a liquid or swampy portion 14 before its solidification in the core.
  • a Sump tip 16 which defines the solidification length of the metal strand 10, formed in a, considered in the casting direction, end portion of a secondary cooling 22.
  • a plurality of roller segments 24 or generally segments are arranged for its deformation and support, which are provided with support rollers or strand guide rollers 26 and formed hydraulically adjustable.
  • the strand guide rollers 26 are adjustable and partially formed rotationally driven.
  • the continuous casting plant 20 has a distribution vessel or casting distributor 28 and a continuous casting mold 130 connected thereto. From a ladle 32 molten steel runs in the G confuseverteiler 28 and from there into the mold 130. Below the mold 130, a plurality of strand guide rollers 26 are provided for supporting an upper and lower side of the metal strand 10, wherein the metal strand in this area initially has a very thin strand shell. The metal strand 10 then passes through a circular arc-shaped area, and then runs out in a straightening zone and can e.g. be separated in slabs in a downstream scissors or flame cutting machine.
  • a resulting width of a metal strand 10 is calculated at this end 21, as a basis for a subsequent adjustment of at least one narrow side of the mold 130th Das
  • the metal strand 10 is cooled and essentially solidified, wherein the metal strand 10 may also already be singulated into individual slabs.
  • the measuring device 100 may be arranged at a measuring point 102, namely below an outlet opening 132 of the mold 130 and at a comparatively small distance therefrom, by the width of the Metal strand 10 at this point to measure. Additionally or alternatively, a measuring device 100 may also be arranged at a measuring point 104, namely at the end 21 of the continuous casting plant 20 or outside thereof, in order to measure the width of the thoroughly solidified and cooled metal strand 10 or the width of a slab formed therefrom. With regard to the arrangement of a measuring device 100 may be noted that the associated measuring point is located at a predetermined distance from the outlet opening 132 of the mold 130.
  • the measuring device 100 is connected by a signal line 122 to the above-mentioned computing device 120, so that the measured at the measuring point 102, 104 width of the metal strand 10 is transmitted to the computing device 120.
  • the signal line 122 it should be pointed out that this can either be a physical signal line or a suitable radio link or the like.
  • Fig. 3 shows in principle and greatly simplified a device 1 according to the present invention, with the explained above at the measuring point 102, for example in a continuous casting 20 of Fig. 2 , the width B of a metal strand 10 can be measured.
  • the width of the metal strand 10 or a slab formed therefrom can also be determined at the measuring point 104, namely at the end 21 of the continuous casting plant 20.
  • the device 1 comprises a measuring device 100, which at the measuring point 102 or 104 (see. Fig. 2 ), and the computing device 120 to which the measuring device 100 is connected via the signal line 122.
  • a change in the width of the metal strand 10 at the measuring point 102, or a change in the width of the metal strand 10 or a slab formed therefrom at the measuring point 104, compared to the width of the metal strand 10 at the outlet opening 132 of the mold 130, are determined.
  • the computational device 120 has the breadth model BM based on which the width of the Metal strand 10 at the end 21 of the continuous casting 20 (see. Fig. 2 ) is calculated and compared with a predetermined setpoint value, wherein the computing device 120 subsequently generates an actuating signal thereto.
  • This control signal is transmitted via a further signal line 122 to a standing with at least one narrow side 134 of the mold 130 in operative connection actuator 136, whereby then the narrow side 134 of the mold 130 is suitably employed.
  • Fig. 4 shows in principle simplified, the two narrow sides 134 of the mold 130, which are spaced apart by a distance A.
  • the distance A between these narrow sides 134 can be suitably changed, thereby affecting the width of the metal strand 10 at the outlet opening 132 of the mold 130.
  • it is also possible to change the inclination of a narrow side 134 with respect to the vertical V as it is simplified in principle in the representation of Fig. 5 is shown.
  • an upper edge of the narrow side 134 can be displaced by a distance N with respect to the lower edge of the narrow side 134, so that a surface of the narrow side 134 encloses an angle with the vertical V.
  • Fig. 6 2 shows simplified cross-sectional views of a continuously cast metal strand 10, and illustrates the increase of the metal strand 10 in its width B as a result of propagation.
  • the areas I in the middle of Fig. 6 the width change of the metal strand 10 as a result of Wreitung or a creep of the material.
  • the areas II in the lower part of Fig. 6 illustrate a change in width of the metal strand 10 due to spreading and bulging.
  • the invention now works as follows: In the continuous casting of a metal strand 10 is calculated by the computing device 120 based on the Breitungsmodells BM, the width of the metal strand 10 or a slab formed therefrom for the end 21 of the continuous casting 20 and compared with a predetermined setpoint, then at least one narrow side 134 of the mold 130 through an associated actuator 136 is suitably set, namely as a function of the calculated for the end 21 of the continuous casting width B of the metal strand 10th
  • the at least the physical properties of the material of the metal strand, the temperature of the metal in the mold 130, the casting rate of the metal strand 10, overheating and the geometry of the metal strand 10th include.
  • the reference character "140" is to be understood that from the Breitungsmodell BM in the computing device 120, a change in the process parameters of the continuous casting process, such as overheating, casting speed and water cooling, can be considered, and then in the control of the actuator 136 for hiring the at least one narrow side 134 flows.
  • a measuring device 100 may be provided at the measuring point 102 and at the measuring point 104 in order there to determine the width of the metal strand 10 (at the measuring point 102) or the width of the metal strand 10 or a slab formed therefrom (at the measuring point 104). With the width measurement by the measuring device 100 can thus be determined a change in the width of the metal strand 10 or a slab at the respective measuring point 102, 104 compared to the width of the metal strand 10 at the outlet opening 132 of the mold 130, and then with a predetermined setpoint for the width of the metal strand 10 or a slab formed therefrom. In this case, the measured value generated by the measuring device 100 then forms for the width of the metal strand 10 or a slab formed therefrom another calculation parameter for the calculation in the Breitungsmodell BM.
  • a bulge II of the metal strand 10 can be minimized, possibly in conjunction with a suitable adaptation of the water cooling in the secondary cooling 22, and possibly in conjunction with a Adaptation of a cooling of the narrow sides 134 of the mold 130.
  • Fig. 7 shows a diagram for defining the width proportion of the metal strand 10 at the position of the measuring point 102, for example, for two different casting speeds (with v1> v2). It can be seen that the increase in width decreases steadily with increasing distance from the casting mirror or from the outlet opening 132 of the mold 130 and, for example, does not increase any further at a distance of 15 meters from the casting mirror or proceeds from there to constant.
  • Fig. 8 shows a diagram illustrating the course of the propagation of the metal strand 10 within the strand guide in the continuous casting 20 of Fig. 2 , where the graph G1 represents the spread and the graph G2 represents the shrinkage of the metal strand 10.
  • FIG. 9 and Fig. 10 In each case diagrams are shown with which the calculation of the expansion of the metal strand 10 based on the Breitungsmodells according to the present invention is illustrated, this being for a variation of the casting speed ( Fig. 9 , with v1> v2) or for a variation of overheating ( Fig. 10 , with overheating H1> overheating H2).
  • FIG. 12 is a flow chart illustrating the above-described aspects of the present invention again.
  • the parameters a, b, c and d shown herein, which govern the mathematical-physical model MPM, may be the parameters of the Garofalo approach and its regression coefficients.

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  • Mechanical Engineering (AREA)
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Claims (18)

  1. Procédé pour le réglage de la largeur d'une barre métallique (10) coulée en continu à travers une lingotière (130) dans une installation de coulée continue (20) ; dans lequel une correction de largeur est calculée pour la barre métallique (10) et est transmise à titre de valeur de réglage pour l'ajustage d'au moins un petit côté de la lingotière (130) ; dans lequel, sur base d'un modèle d'élargissement (BM), via un dispositif de calcul (120), la largeur (B) de la barre métallique (10) ou d'une brame fabriquée à partir de cette dernière est calculée à la fin (21) de l'installation de coulée continue (20) en fonction d'au moins un paramètre de calcul et est comparée à une valeur de consigne prédéterminée ; dans lequel au moins un petit côté (134) de la lingotière (130), de préférence les deux petits côtés (134) de la lingotière (130), est/sont réglé(s) en fonction de la largeur (B) de la barre métallique (10), respectivement de la brame, calculée pour l'extrémité (21) de l'installation de coulée continue (20) ; dans lequel une largeur (B) de la barre métallique (10) est mesurée à au moins un endroit de mesure (102 ; 104) à une distance prédéterminée de l'ouverture de sortie (132) de la lingotière (130) et la valeur de mesure correspondante de cette largeur (B) est transférée au dispositif de calcul (120) pour être prise en compte dans le modèle d'élargissement (BM), caractérisé en ce que ledit au moins un endroit de mesure (102) est situé au sein du guidage de barre de l'installation de coulée continue (20) dans la partie supérieure de cette dernière, de préférence à une distance de 4 à 12 m d'une ouverture de sortie (132) de la lingotière (130).
  2. Procédé selon la revendication 1, caractérisé en ce que le réglage dudit au moins un petit côté (134) de la lingotière (130) est mis en oeuvre, de préférence est régi par le dispositif de calcul (120) en fonction de la largeur (B) de la barre métallique (10) calculée pour l'extrémité (21) de l'installation de coulée continue (20).
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le modèle d'élargissement (BM) comprend un modèle thermodynamique (TM) et un modèle mathématique-physique (MPM) ; dans lequel, au moyen du modèle thermodynamique (TM), on détermine des températures et des épaisseurs de croûtes solidifiées de la barre métallique (10) à chaque position de la barre métallique (10) dans l'installation de coulée continue (20) ; dans lequel, au moyen du modèle mathématique-physique (MPM), on détermine un fluage de la barre métallique (10) ; dans lequel le modèle thermodynamique (TM) et le modèle mathématique-physique (MPM) sont couplés l'un à l'autre, d'une manière telle qu'avec les valeurs déterminées via ces modèles, on détermine la largeur (B) de la barre métallique (10) ou d'une brame formée à partir de cette dernière à la fin ou à l'extrémité (21) de l'installation de coulée continue (20).
  4. Procédé selon la revendication 3, caractérisé en ce que, dans le modèle thermodynamique (TM), on calcule des modifications de l'état thermodynamique de l'ensemble de la barre métallique (10) dans un modèle de simulation mathématique, dans lequel est incluse une équation de conduction thermique, modèle sur base duquel il est possible de tirer une conclusion en ce qui concerne la température de la barre métallique (10) tout au long de l'installation de coulée continue (20).
  5. Procédé selon la revendication 3 ou 4, caractérisé en ce que le modèle mathématique-physique (MPM) prend en compte une approche du fluage, en particulier une approche pour le fluage secondaire.
  6. Procédé selon la revendication 5, caractérisé en ce que, pour l'approche du fluage, on prend en compte des paramètres de la barre métallique (10) spécifique à la matière première et/ou la température opératoire de la barre métallique (10) au cours de la coulée continue.
  7. Procédé selon l'une quelconque des revendications 3 à 6, caractérisé en ce que les valeurs déterminées au moyen du modèle thermodynamique (TM) sont prises en compte pour le calcul via le modèle mathématique-physique (MPM).
  8. Procédé selon l'une quelconque des revendications 1 à 7, caractérisé en ce que ledit au moins un paramètre de calcul, qui est pris en compte dans le modèle d'élargissement (BM), comprend au moins les propriétés physiques de la matière première de la barre métallique (10), la température du métal dans la lingotière (130), la vitesse de coulée de la barre métallique (10), la surchauffe et/ou la géométrie de la barre métallique (10).
  9. Procédé selon la revendication 8, caractérisé en ce que ledit au moins un paramètre de calcul est déterminé au cours du processus de coulée continue et par conséquent en temps réel ("en ligne").
  10. Procédé selon l'une quelconque des revendications 1 à 9, caractérisé en ce que la largeur de la barre métallique (10) est calculée sur base du modèle d'élargissement (BM) dans des segments individuels de la section transversale de la barre métallique (10) dans sa direction de coulée.
  11. Procédé selon l'une quelconque des revendications 1 à 10, caractérisé en ce que, dans le modèle d'élargissement (BM), on prend en compte un retrait de la barre métallique (10) dans la direction de coulée.
  12. Procédé selon l'une quelconque des revendications 1 à 11, caractérisé en ce qu'un endroit de mesure supplémentaire (104) se trouve au sein du guidage de barre de l'installation de coulée continue (20) à la fin de l'installation de coulée continue (20) ou à l'extérieur de cette dernière.
  13. Procédé selon l'une quelconque des revendications 1 à 12, caractérisé en ce que la température du métal à l'intérieur de la lingotière (130) est enregistrée via la température d'au moins une paroi latérale de la lingotière (130), de préférence en ce que la température du métal à l'intérieur de la lingotière (130) est enregistrée sur base des flux thermiques qui s'évacuent via l'eau de refroidissement de la lingotière sur au moins un côté de la lingotière.
  14. Procédé selon l'une quelconque des revendications 1 à 13, caractérisé en ce qu'on détermine un placement et/ou une vitesse de placement pour ledit au moins un petit côté (134) de la lingotière sur base du modèle d'élargissement (BM).
  15. Procédé selon l'une quelconque des revendications 1 à 14, caractérisé en ce qu'on détermine un placement et/ou une vitesse de placement pour ledit au moins un petit côté (134) de la lingotière en fonction d'une surchauffe (H1 ; H2) du métal liquide, à partir duquel la, barre métallique (10) est coulée, d'un refroidissement secondaire et/ou d'un changement d'analyse.
  16. Procédé selon l'une quelconque des revendications 1 à 15, caractérisé en ce qu'il est fait appel à la température de coulée à partir d'un endroit de mesure de la température dans la poche ou dans le panier de coulée, ou la température de coulée est calculée avec un modèle de poche ou de panier de coulée.
  17. Dispositif (1) pour le réglage de la largeur (B) d'une barre métallique (10) obtenue par coulée continue à travers une lingotière (130) dans une installation de coulée continue (20), comprenant :
    un dispositif de calcul (120) dans lequel est incorporé un modèle d'élargissement (BM) et sur base duquel, en fonction d'au moins un paramètre de calcul, la largeur (B) de la barre métallique (10) ou d'une brame formée à partir de cette dernière, est calculée à l'extrémité ou à la fin (21) de l'installation de coulée continue (20) et est comparée à une valeur de consigne prédéterminée ; dans lequel le dispositif de calcul (120) génère à la suite un signal de réglage ;
    un organe de réglage (136) relié de manière opérationnelle à au moins un petit côté (134) de la lingotière (130), qui peut être excité par le signal de réglage afin de régler ledit au moins un petit côté (134) de la lingotière (130) ; et
    au moins un dispositif de mesure (100) avec lequel on peut mesurer une largeur (B) de la barre métallique (10) ou d'une brame formée à partir de cette dernière à un endroit de mesure (102 ; 104) disposé à une distance prédéterminée de l'ouverture de sortie (132) de la lingotière (130) ;
    caractérisé en ce que le dispositif de mesure (100) est disposé à un endroit de mesure (102) au sein du guidage de barre de l'installation de coulée continue (20) dans la partie supérieure de cette dernière, de préférence à une distance de 4 à 12 m d'une ouverture de sortie (132) de la lingotière (130).
  18. Dispositif selon la revendication 17, caractérisé en ce que le dispositif de mesure (100) est disposé en outre à un endroit de mesure (104) à la fin ou à l'extrémité de l'installation de coulée continue (20) ou à l'extérieur de cette dernière.
EP16200278.6A 2015-11-26 2016-11-23 Procédé et dispositif de réglage de la largeur d'une barre métallique coulée en continu Active EP3173166B1 (fr)

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CN110560652A (zh) * 2019-10-16 2019-12-13 北京首钢股份有限公司 一种特殊钢铸坯裂纹的控制方法
CN113600771B (zh) * 2021-07-30 2023-05-23 上海二十冶建设有限公司 一种矩形立式连铸机结晶器离线校弧装置及使用方法

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AT381050B (de) * 1985-01-21 1986-08-11 Voest Alpine Ag Verfahren zum stranggiessen sowie einrichtung zur durchfuehrung des verfahrens
JPS61232049A (ja) 1985-04-09 1986-10-16 Nippon Steel Corp 連鋳鋳片幅一定制御方法
US5205345A (en) * 1991-08-07 1993-04-27 Acutus Industries Method and apparatus for slab width control
DE19814222A1 (de) * 1998-03-31 1999-10-07 Schloemann Siemag Ag Verfahren zum Stranggießen und Fertigwalzen eines Gießstranges innerhalb einer vorgegebenen Fertigbreitentoleranz
DE102011082158A1 (de) 2011-09-06 2013-03-07 Sms Siemag Ag Gießverfahren, insbesondere Stranggießverfahren
DE102013214811A1 (de) 2013-01-30 2014-07-31 Sms Siemag Aktiengesellschaft Verfahren und Vorrichtung zum Gießen eines Strangs

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