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EP4061552B1 - Procédé, dipositif de contrôle et laminoir pour le réglage d'une température de sortie d'une bande métallique quittant un train de laminage - Google Patents

Procédé, dipositif de contrôle et laminoir pour le réglage d'une température de sortie d'une bande métallique quittant un train de laminage Download PDF

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Publication number
EP4061552B1
EP4061552B1 EP20797072.4A EP20797072A EP4061552B1 EP 4061552 B1 EP4061552 B1 EP 4061552B1 EP 20797072 A EP20797072 A EP 20797072A EP 4061552 B1 EP4061552 B1 EP 4061552B1
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EP
European Patent Office
Prior art keywords
strip
rolling
metal strip
roll stand
process model
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EP20797072.4A
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German (de)
English (en)
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EP4061552A1 (fr
Inventor
Frank Theobald
Jörn Sieghart
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SMS Group GmbH
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SMS Group GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B2003/001—Aluminium or its alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2271/00—Mill stand parameters
    • B21B2271/02—Roll gap, screw-down position, draft position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/02—Speed
    • B21B2275/06—Product speed

Definitions

  • the invention relates to a method and a control device for setting an exit temperature of a metal strip exiting an at least two-stand rolling train.
  • the invention relates to a rolling mill for rolling a metal strip, having at least one at least two-stand rolling train and at least one control device for setting an outlet temperature of the metal strip emerging from the rolling train.
  • Metal strips are rolled in rolling mills to a desired outlet thickness.
  • the metal strip coming out of a rolling mill is wound up into a spool or coil.
  • a temperature of the coiled metal strip is important for the quality of the respective metal strip, in particular for metal strips made from certain aluminum alloys.
  • the temperature of such a metal strip must be kept within a relatively narrow temperature range in order to achieve specified mechanical properties of the metal strip.
  • DE 20 2014 011 231 U1 relates to a system having a first stand having a first pair of work rolls for reducing a thickness of a material to a first specified point, a second stand having a second pair of work rolls for reducing the thickness of the material to a second specified point, and a temperature sensor positioned to measure the temperature of the material as it exits the second rack.
  • the system also includes a controller coupled to the temperature sensor, the first frame, and the second frame to adjust at least one of the first specified point and the second specified point based on the temperature of the material measured by the temperature sensor with the it exits the second rack.
  • EP 2 697 002 B1 relates to a control method for a rolling mill, wherein a temperature is determined for strip sections of a strip upstream of a first rolling stand of the rolling mill, which the strip sections have, with a strip model using the temperatures determined the temperatures of the strip sections for the time of rolling of the respective strip section in the first roll stand are predicted, with at least one respective control parameter for rolling the strip sections in the first roll stand being determined using the predicted temperatures of the strip sections, and with an adjusting device acting on the first roll stand during the rolling of the respective strip section, taking into account the respective determined Control parameter is controlled.
  • the temperatures of the strip sections are forecast for the time of rolling of the respective strip section in the first roll stand using the strip model with a first forecast horizon.
  • the first forecast horizon corresponds to a plurality of strip sections to be rolled in the first roll stand.
  • a control variable curve for the control device is applied for the first forecast horizon.
  • a profile of a roll gap formed by work rolls of the first roll stand is influenced by the course of the manipulated variable.
  • a respective roll gap profile is predicted, which the work rolls of the first roll stand form at the time of rolling the respective strip section.
  • the set manipulated variable curve is optimized using the roll gap profile predicted for the strip sections and a respective target profile.
  • the current value of the optimized manipulated variable profile corresponds to the control parameter and is specified as the manipulated variable for the actuating device.
  • EP 3 089 833 B1 relates to a system having a first stand having a first pair of work rolls to reduce a thickness of a material to a first set point, a second stand having a second pair of work rolls to reduce the thickness of the material to a second set point reduce, and one Temperature sensor arranged to measure the temperature of the material as it leaves the second stand.
  • the system also includes a controller coupled to the temperature sensor, the first stand, and the second stand to set at least one of the first set point and the second set point based on the temperature of the material exiting the second stand as measured by the temperature sensor. set.
  • One object of the invention is to provide a method for adjusting an outlet temperature of a metal strip leaving a rolling mill that can be implemented more cost-effectively, with which a metal strip of higher quality can be produced.
  • This object is solved by the independent patent claim.
  • Advantageous configurations are in the following description and the dependent Patent claims reproduced, these configurations, each taken individually or in various combinations of at least two of these configurations with one another, can represent a further developing, in particular also preferred or advantageous, aspect of the invention.
  • the outlet temperature is determined by means of a process model, taking into account a relationship between a strip deformation and/or a cooling rate of the metal strip by at least one cooling medium and by the contact of the metal strip with at least one fixed Rolling train component and / or a rolling speed in a last roll stand of the rolling train on the one hand and the outlet temperature set on the other hand.
  • a deviation with the intervention-related deviation associated deviation of the outlet temperature from a setpoint temperature contained in the context is determined, the strip forming in the last roll stand and in one or more upstream roll stands of the rolling mill being changed by means of the process model depending on the deviation in the outlet temperature such that the outlet temperature corresponds to the setpoint temperature.
  • connection between the strip forming and/or the rolling speed in the last roll stand of the rolling train on the one hand and the outlet temperature, particularly at the respective operating point, on the other hand can be calculated using a higher-level pass schedule computer.
  • a working point is to be understood as meaning all the setting values (relating to the physical properties of forming, thickness, speed, temperature) of an area within which rolling is carried out (target pass schedule), as well as the areas in between that are passed through to reach the area.
  • target pass schedule target pass schedule
  • Operating points are taken into account. Four operating points are particularly favorable within the meaning of the invention, since they contain all the important key points of the rolling process without requiring too much computing time to determine them.
  • the pass schedule computer is set up to define this relationship as a set state and to transfer coefficients corresponding to the set state to the (mathematical) process model.
  • the pass schedule computer can be set up to transfer corresponding coefficients to a device for controlling actuators of the rolling train.
  • coefficients can consist of one or more terms or of terms composed of them, of the sizes listed below by way of example: ⁇ P ⁇ ⁇ T , ⁇ f ⁇ ⁇ T , ⁇ M ⁇ ⁇ T , ⁇ v ⁇ ⁇ T , ⁇ Q ⁇ ⁇ ⁇ T , ⁇ T f ⁇ ⁇ T , ⁇ ⁇ h ⁇ ⁇ T , ⁇ f v ⁇ ⁇ T , ⁇ l vn ⁇ ⁇ T .
  • T is the temperature
  • P is the rolling power
  • F is the rolling force
  • M is the rolling torque
  • v is the rolling speed
  • Tf is the fluid temperature
  • Q is the fluid volume flow
  • h is the thickness of the rolling stock
  • ⁇ h is the decrease
  • I VN is the length of a strip at constant strip speed and fv the advance.
  • the cooling medium can be air, water, oil or an emulsion, for example.
  • the rolling train component can be, for example, a roll or a work roll.
  • the process model can be set up to monitor directly or indirectly whether a current state of the rolling train corresponds to the setting state. If this set condition is not reached during rolling operation due to other controller interventions, or if the strip forming and/or the cooling rate of the metal strip changes due to the application of a cooling medium to the metal strip and contact of the metal strip with at least one fixed rolling train component and/or the rolling speed in the roll gap of the last roll stand, for example due to interventions by operating personnel, the process model according to the invention can use the coefficients supplied by the pass schedule computer to determine the deviation of the strip forming and/or the rolling speed in the last roll stand from the related deviations caused by the intervention contained setting values for strip forming and / or the rolling speed in the last rolling stand determine a deviation associated with the intervention-related deviation of the outlet temperature from a setpoint temperature contained in the context.
  • the process model is also set up to change the strip forming in the last rolling stand and in one or more rolling stands of the rolling train that are upstream with respect to a strip conveying direction through the rolling train, depending on the determined deviation of the outlet temperature, in such a way that the outlet temperature corresponds to the setpoint temperature. Consequently, the outlet temperature of the metal strip is set using the process model, taking into account the relationship described above.
  • the process model can change the strip forming and/or the rolling speed and/or the cooling rate or the associated amount of coolant in the last roll stand and the one or more upstream roll stands such that the outlet temperature of the metal strip returns to the setpoint temperature.
  • the metal strip can be an aluminum strip or steel strip, for example.
  • the rolling train can be a cold rolling tandem train, for example.
  • the last rolling stand of the rolling train is the last rolling stand with regard to a mass flow or a direction of movement of the metal strip through the rolling train.
  • the rolling train has at least two, three or more roll stands.
  • the direction of movement of the metal strip through the mill can also change, e.g. B. with a reversing stitch.
  • the model-based temperature setting according to the invention has the advantage that ideally it does not require any sensors. This reduces investment, commissioning and maintenance expenses. A simple off-line temperature measurement on the wound coil would be sufficient for process model validation.
  • the process model also ensures that temperature setting and thickness control are decoupled, so that the quality of the end product can be increased by minimizing mutual interference between different controls.
  • the Dynamics of the temperature setting is at a uniformly high level for different products thanks to the process model.
  • the invention thus represents a model-based approach to a temperature setting that is fully integrated into a rolling mill control architecture, which requires less investment than the prior art, for example by eliminating the expensive thermal imaging camera that is customary with aluminum strips, less commissioning effort, lower operating costs, in particular maintenance costs and replacement costs , higher control quality and dynamics, better product quality and greater reliability.
  • An essential advantage of the invention compared to a conventional temperature controller is that the outlet temperature can already be set at an earlier point in time in the rolling process, particularly in the case of a plant in batch operation.
  • the method according to the invention works more evenly over the length of the strip and is more dynamic, since the process data are determined directly in the roll gap and are not subject to dead time due to the transport to the temperature measuring point.
  • Another advantage is that the method according to the invention allows higher rates of change over time for setting the target temperature.
  • a change in a decrease in strip thickness of the metal strip in the last roll stand that is required to achieve the setpoint temperature is determined by means of the process model as a function of the deviation in the outlet temperature, and a roll gap height in one or more upstream roll stands is increased by one of the change in the strip thickness of the metal strip in changed in the opposite direction corresponding to the amount corresponding to the last stand. If, for example, the rolling speed of the pass schedule calculated by the pass schedule computer or setting condition is not reached, the outlet temperature of the metal strip is too low. The process model can then increase the strip deformation in the last roll stand in order to achieve a desired exit temperature of the metal strip even with the lower rolling speed.
  • the process model uses the coefficients supplied by the pass schedule computer to calculate a required change in strip forming in one or more upstream roll stands, so that, together with the strip forming required to set the desired exit temperature of the metal strip in the last roll stand, a desired exit thickness of the metal strip remains unchanged remains.
  • the process model calculates, for example, a percentage change in the decrease or reduction in the thickness of the metal strip in the last roll stand of +15% that is required to achieve the desired exit temperature of the metal strip
  • the decrease or reduction in the thickness of the metal strip in one or more upstream roll stands is as follows compensates that the total decrease remains constant.
  • the strip thickness of the metal strip is initially reduced, for example from 0.4 mm to 0.3 mm in the penultimate roll stand and from 0.3 mm to 0.2 mm in the last roll stand, and if there is a deviation in the exit temperature of the metal strip, this can Process model change the strip forming using the last two roll stands in such a way that the strip thickness is reduced from 0.4 mm to 0.345 mm with the penultimate roll stand and from 0.345 mm to 0.2 mm with the last roll stand, so that the outlet thickness of the metal strip is not affected becomes.
  • the respective manipulated variable is the roll gap height of the respective roll stand calculated by the process model.
  • a separate stand model contained in the process model is used for the last roll stand and for one or more upstream roll stands, which is adapted at time intervals by forcing the respective roll stand without metal strip.
  • the (mathematical) framework model is a framework model calibrated by the impression (calibration process). The work rolls of the respective roll stand are brought into contact with one another during the bucking, with adjustment paths, forces and the like being able to be recorded, for example by means of the process model, in order to adapt the stand model.
  • a cooling model contained in the process model is used, with which a cooling of the metal strip through optional application of different coolants and a cooling of the metal strip due to contact with work rolls is calculated.
  • the various coolants can be air, water, oil or an emulsion, for example.
  • the contact of the metal strip with the work rolls results in a flow of heat, via which heat flows away from the metal strip via the work rolls, so that the metal strip is cooled.
  • the cooling model can take into account the flow temperatures, volume flows and residence times in the relevant parts of the plant.
  • the cooling capacity can be calculated using coefficients that are determined by the pass schedule calculator.
  • an inlet temperature level of a coil made from the metal strip before it enters the rolling train is taken into account in the process model. This information is also required for setting up the system.
  • the primary distinction to be made here is whether it is a coil that has been cooled to room temperature or a coil that has been heated above room temperature as a result of hot rolling or annealing processes. This can be done by manually or inline measuring the temperature in the infeed of the rolling train or by calculating the cooling based on data from process steps over time from production planning.
  • changes in the strip deformations in the last roll stand and one or more upstream roll stands are precontrolled by means of a tracking module, in that the respective change in strip thickness is shifted into the respective roll stand with a respectively measured strip speed.
  • the tracking module ensures that the variations in the manipulated variables calculated by the coefficients in the downstream roll stands occur at the right time, so that when the correct exit temperature is set, there are never any disturbances in the thickness.
  • the tracking module can be used in a transient range in which the thickness of the Changes metal strips, redistribute the strip forming in the nips of the last roll stand and one or more upstream roll stands, so that a desired outlet thickness of the metal strip is not disturbed.
  • the temperature change based on the rolled strip length as a function of the strip speed is determined by means of the process model.
  • changes in roll gap heights in the last roll stand and one or more upstream roll stands are compensated by means of the process model by changes in the speeds of work rolls of the last roll stand or the one or more upstream roll stands, the speeds being determined using a or the mass flow contained in the process model through the rolling mill can be determined.
  • the changes in overfeeds and strip thicknesses can be pre-controlled by the redistribution of forming in such a way that, ideally, the thickness control downstream of the last roll stand does not interfere. This can be achieved, for example, in that a change in the adjustment in the last roll stand and in one or more upstream roll stands is compensated for by the change in speed in the affected roll stand(s) that corresponds to the mass flow.
  • a strip tension remains unchanged, regardless of whether a tension control affects the adjustment or the stand speed.
  • changes in the overfeed of the metal strip are made by means of the process model when the strip speed is corrected taken into account when the process model has determined a deviation in the strip forming and/or the rolling speed in the last rolling stand due to an intervention by an actuator of another control device of the rolling train.
  • the lead changes can be taken into account, for example, via difference quotients of the pass schedule model when correcting the speed. If the process model detects a deviation in strip forming from the set state due to the intervention of an actuator, for example a thickness control or tension control, the process model can apply the speed correction analogously.
  • the process model can work continuously and the strip forming can be continuously distributed between the roll stands and advance changes can also be pre-controlled, ideally there is no disruption to a desired exit thickness of the metal strip. If, for example, the reduction in the last rolling stand is less than that provided for in the settlement (input variables: outlet thickness, rolling torque and rolling force in the last rolling stand), then the reduction in one or more upstream rolling stands is reduced, so that the reduction in the last rolling stand can be increased. The greater deformation then leads to the desired increase in the outlet temperature.
  • the changes in speed and overfeed that occur during the rearrangement are pre-controlled by the changed mass flow balance and overfeed coefficients doverfeed/dreduction in the roll stands concerned, so that tension and thickness disturbances do not occur during the rearrangement.
  • connection between the strip forming and/or the cooling rate of the metal strip by at least one cooling medium and by at least one fixed rolling train component and/or the rolling speed in the last rolling stand on the one hand and the exit temperature on the other hand is determined with the aid of temperature measurements at the end of the rolling train expiring metal band adapted.
  • the actual coil temperature can be measured with a hand-held measuring device at the end of a rolling program.
  • Inline temperature measurement is more convenient but more complex.
  • the measured values of the respective temperature measurement can be sent automatically to the pass schedule computer, which calculates and compares the measured temperature with a calculated temperature value and adapts the calculated temperature value to the measured value.
  • other model parameters can also be adapted.
  • a control device for setting an exit temperature of a metal strip exiting an at least two-stand rolling train is set up in such a way that it carries out the method according to one of the above-mentioned configurations.
  • control device can be given as a separate device or can be realized by a software implementation in existing system electronics of a rolling mill.
  • the control device can be used as a predictive temperature controller of a rolling mill based on a process model.
  • a rolling mill according to the invention for rolling a metal strip has at least one at least two-stand rolling train and at least one above-mentioned control device for setting an outlet temperature of the metal strip emerging from the tandem rolling train, the rolling train having at least one fixed rolling train component for contact with the rolled strip and means for loading the metal strip having a coolant medium.
  • the rolling mill can be designed as a multi-stand cold rolling tandem train, in particular for the production of aluminum strip.
  • figure 1 shows a schematic representation of an exemplary embodiment of a rolling mill 1 according to the invention for rolling a metal strip 2.
  • the rolling mill 1 has a three-stand rolling train 3 and a control device 4, shown symbolically, for setting an outlet temperature of the metal strip 2 emerging from the rolling train 3.
  • the control device 4 is set up to carry out a method according to the invention for setting the exit temperature of the metal strip 2 exiting the rolling train 3 .
  • P 1 is the target rolling capacity of the first roll stand 5 and P' 1 is the actual rolling capacity of the first roll stand 5.
  • h 10 is the inlet thickness of the rolled strip 2 entering the first roll stand 5 and h 11 is the outlet thickness of the first roll stand 5 expiring rolled strip 2, where ⁇ h 1 , the decrease in the thickness of Rolled strip 2 in the first roll stand 5 is.
  • v 1 is the strip speed of the rolled strip 2 leaving the first roll stand 5 and S 12 is the strip tension in the rolled strip 2 between the first roll stand 5 and a second roll stand 6 downstream of the first roll stand 5.
  • P 2 is the target rolling capacity of the second rolling stand 6 and P' 2 is the actual rolling capacity of the second rolling stand 6.
  • h 20 is the entry thickness of the rolled strip 2 entering the second rolling stand 6 and h 21 is the exit thickness of the rolling strip 2 exiting the second rolling stand 6 Rolled strip 2, where ⁇ h 2 is the decrease in the thickness of the rolled strip 2 in the second roll stand 6.
  • v 2 is the strip speed of the rolled strip 2 leaving the second roll stand 6 and S 23 is the strip tension in the rolled strip 2 between the second roll stand 6 and a third or last roll stand 7 downstream of the second roll stand 6.
  • P 3 is the target rolling capacity of the third rolling stand 7 and P' 3 is the actual rolling capacity of the third rolling stand 7.
  • h 30 is the entry thickness of the rolled strip 2 entering the third rolling stand 7 and h 31 is the exit thickness of the rolling strip 2 exiting the third rolling stand 7 Rolled strip 2, where ⁇ h 3 is the decrease in the thickness of the rolled strip 2 in the third roll stand 7.
  • v 3 is the strip speed of the rolled strip 2 leaving the third roll stand 7.
  • T is the target temperature of the cold or hot strip 2 leaving the rolling train 3 and T' is the actual temperature of the cold or hot strip 2 leaving the rolling train 3, where ⁇ T is the temperature difference between the target temperature and the actual temperature is.
  • figure 2 shows a schematic representation of a further embodiment of a rolling mill according to the invention for rolling a metal strip, not shown, of the rolling mill, only a pass schedule computer 8 and the process model 9 with reference to a roll stand n are shown.
  • An inlet temperature T0 of the hot strip, an outlet temperature T of the hot strip, a reduction in thickness ⁇ h within the roll stand n and material and system data A are fed to the pass schedule computer 8 . From this, the pass schedule calculator 8 determines on the right in figure 2 shown coefficients and setting values, which are fed to the process model 9 together.
  • the process model 9 is also given the current rolling power P(n) of roll stand n, a current rolling torque M(n) of roll stand n, a current rolling force F(n) of roll stand n, a current rolling speed v(n) of roll stand n, a current roll deformation ⁇ h(n) in roll stand n, a current coolant temperature Tf(n) at roll stand n and a current coolant volume flow Q(n) at roll stand n. Furthermore, optionally calibration curves K(n) of the roll stand n and optionally a measured actual temperature T are supplied to the process model 9 .
  • the process model 9 determines a rolling speed change ⁇ v(n) over time t and a decrease change ⁇ h(n) over time t for the roll stand n.
  • the process model 9 has a stand model 10, a cooling model 11 and a tracking module 12 .
  • FIG 3A shows a schematic representation of a framework model 10 of an embodiment of a process model according to the invention.
  • the stand model 10 is supplied with the current rolling force F(n) of a roll stand n and a current roll deformation ⁇ h(n) in the roll stand n. Furthermore, a framework module G(n) and a belt module B(n) are supplied to the framework model 10 . From this, the stand model 10 determines a setting position deviation ⁇ s(n) from a setting value s(n) of the roll stand n.
  • the stand model 10 can be used in the process model figure 2 be implemented.
  • FIG 3B shows a schematic representation of a cooling model 11 of an exemplary embodiment of a process model according to the invention.
  • the cooling model 11 a current rolling speed v(n) of roll stand n, a current coolant temperature Tf(n) at roll stand n and a current coolant volume flow Q(n) at roll stand n are supplied. Furthermore, the cooling model 11 system data A (n) are supplied. From this, the cooling model 11 determines a strip temperature deviation ⁇ T(n) from a set value T(n) at the roll stand n.
  • the cooling model 11 can be included in the process model figure 2 be implemented.
  • FIG 3C shows a schematic representation of a tracking module 12 of an embodiment of a process model according to the invention.
  • the tracking module 12 receives the data from the skeleton model Figure 3A determined adjustment position deviation ⁇ s(n) of roll stand n and the current rolling speed v(n) of roll stand n. Furthermore, the tracking module 12 system data A (n) are supplied. From this, tracking module 12 determines a change in rolling speed ⁇ v(n) over time t and a change in decrease ⁇ h(n) over time t for roll stand n. Tracking module 12 can be found in the process model figure 2 be implemented.

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

Claims (13)

  1. Procédé pour régler une température de sortie d'une bande métallique (2) sortant d'un train de laminage (3) ayant au moins deux cages, la température de sortie étant réglée au moyen d'un modèle de processus (9) en tenant compte d'une relation entre une déformation de la bande et/ou un taux de refroidissement de la bande métallique (2) par au moins un agent de refroidissement et par le contact de la bande métallique (2) avec au moins un composant fixe du train de laminage et/ou une vitesse de laminage dans une dernière cage de laminage (7) du train de laminage (3) d'une part et la température de sortie d'autre part,
    caractérisé en ce qu'après une détermination, effectuée en utilisant le modèle de processus (9), d'un écart, dû à une intervention, de la déformation de la bande et/ou de la vitesse de laminage dans la dernière cage de laminage (7) par rapport à des valeurs de positionnement, contenues dans le contexte, pour la déformation de la bande et/ou la vitesse de laminage dans la dernière cage de laminage (7), on détermine, au moyen du modèle de processus (9), un écart, lié à l'écart dû à une intervention, de la température de sortie par rapport à une température de consigne contenue dans le contexte, la déformation de la bande dans la dernière cage de laminage (7) et dans une ou plusieurs cages de laminage (5, 6) en amont du train de laminage (3) étant modifiée au moyen du modèle de processus (9) en fonction de l'écart de la température de sortie de telle sorte que la température de sortie correspond à la température de consigne.
  2. Procédé selon la revendication 1, caractérisé en ce qu'en fonction de l'écart de la température de sortie, au moyen du modèle de processus (9), on détermine une modification d'une diminution d'une épaisseur de bande de la bande métallique (2) dans la dernière cage de laminage (7) qui est nécessaire pour atteindre la température de consigne et on modifie une hauteur d'écartement de laminage dans une ou plusieurs cages de laminage (5, 6) situées en amont d'une valeur correspondant à la modification de l'épaisseur de bande de la bande métallique (2) dans la dernière cage de laminage (7) dans le sens opposé.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que, pour la dernière cage de laminage (7) et pour une ou plusieurs cages de laminage (5, 6) situées en amont, on utilise à chaque fois un modèle de cage (10) propre contenu dans le modèle de processus (9), qui est adapté à intervalles de temps par une empreinte de la cage de laminage (5, 6, 7) respective sans bande métallique (2).
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce qu'on utilise un modèle de refroidissement (11) contenu dans le modèle de processus (9), au moyen duquel on calcule un refroidissement de la bande métallique (2) par une exposition sélective à différents moyens de refroidissement et un refroidissement de la bande métallique (2) dû à un contact avec des cylindres de travail.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce qu'un niveau de température d'entrée d'une bobine de la bande métallique (2) avant une entrée dans le train de laminage (3) est pris en compte dans le modèle de processus (9).
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que les modifications des déformations de la bande dans la dernière cage de laminage (7) et dans une ou plusieurs cages de laminage (5, 6) situées en amont sont pilotées au moyen d'un module de suivi (12), en décalant la modification respective de l'épaisseur de la bande avec une vitesse de bande mesurée respective dans la cage de laminage (5, 6, 7) respective.
  7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce qu'au moyen du modèle de processus (9), on détermine la variation de température due à la longueur de bande laminée en fonction de la vitesse de la bande.
  8. Procédé selon l'une des revendications 1 à 7, caractérisé en ce que les modifications de hauteurs d'écartement des cylindres dans la dernière cage de laminage (7) et dans une ou plusieurs cages de laminage (5, 6) situées en amont sont compensées au moyen du modèle de processus (9) par des modifications des vitesses de rotation des cylindres de travail de la dernière cage de laminage (7) ou de l'une ou de plusieurs cages de laminage (5, 6) situées en amont, les vitesses de rotation étant déterminées en utilisant un débit massique déterminé ou contenu dans le modèle de processus (9) à travers le train de laminage (3).
  9. Procédé selon l'une des revendications 1 à 8, caractérisé en ce que, au moyen du modèle de processus (9), des changements d'avance de la bande métallique (2) sont pris en compte lors d'une correction de la vitesse de la bande, lorsque le modèle de processus (9) a déterminé une variation de la déformation de la bande et/ou de la vitesse de laminage dans la dernière cage de laminage (7) en raison d'une intervention d'un actionneur d'un autre dispositif de régulation du train de laminage (3).
  10. Procédé selon l'une des revendications 1 à 9, caractérisé en ce que la relation entre la déformation de la bande et/ou le taux de refroidissement de la bande métallique (2) par au moins un agent de refroidissement et par au moins un composant fixe du train de laminage et/ou la vitesse de laminage dans la dernière cage de laminage (7) d'une part et la température de sortie d'autre part est adaptée à l'aide de mesures de température sur la bande métallique (2) sortant du train de laminage (3).
  11. Dispositif de commande (4) pour régler une température de sortie d'une bande métallique (2) sortant d'un train de laminage (3) ayant au moins deux cages, caractérisé en ce que ledit dispositif de commande (4) est agencé de manière à mettre en oeuvre le procédé selon la revendication 1, de telle sorte que la température de sortie est réglée au moyen d'un modèle de processus (9) en tenant compte d'une relation entre une déformation de la bande et/ou un taux de refroidissement de la bande métallique (2) par au moins un agent de refroidissement et par le contact de la bande métallique (2) avec au moins un composant fixe du train de laminage et/ou une vitesse de laminage dans une dernière cage de laminage (7) du train de laminage (3) d'une part et la température de sortie d'autre part, dans lequel, après une détermination, effectuée en utilisant le modèle de processus (9), d'un écart, dû à une intervention, de la déformation de la bande et/ou de la vitesse de laminage dans la dernière cage de laminage (7) par rapport à des valeurs de réglage contenues dans le contexte pour la déformation de la bande et/ou la vitesse de laminage dans la dernière cage de laminage (7), un écart, lié à l'écart dû à une intervention, de la température de sortie par rapport à une température de consigne contenue dans le contexte est déterminé au moyen du modèle de processus (9), la déformation de la bande dans la dernière cage de laminage (7) et dans une ou plusieurs cages de laminage (5, 6) en amont du train de laminage (3) étant modifiée au moyen du modèle de processus (9) en fonction de l'écart de la température de sortie de telle sorte que la température de sortie correspond à la température de consigne.
  12. Dispositif de commande (4) selon la revendication 11, caractérisé en ce que le dispositif de commande est agencé de manière à mettre en oeuvre le procédé selon l'une quelconque des revendications 2 à 10.
  13. Laminoir (1) pour laminer une bande métallique (2), comprenant au moins un train de laminage (3) comportant au moins deux cages et au moins un dispositif de commande (4) pour régler une température de sortie de la bande métallique (2) sortant du train de laminage (3), le train de laminage comportant au moins un composant fixe du train de laminage pour le contact avec la bande laminée (2) et des moyens pour appliquer un fluide de refroidissement sur la bande métallique (2), caractérisé en ce que le dispositif de commande (4) est réalisé selon la revendication 11 ou 12.
EP20797072.4A 2019-11-21 2020-10-21 Procédé, dipositif de contrôle et laminoir pour le réglage d'une température de sortie d'une bande métallique quittant un train de laminage Active EP4061552B1 (fr)

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DE102019217966.5A DE102019217966A1 (de) 2019-11-21 2019-11-21 Einstellung einer Auslauftemperatur eines aus einer Walzstraße auslaufenden Metallbands
PCT/EP2020/079634 WO2021099052A1 (fr) 2019-11-21 2020-10-21 Réglage d'une température de sortie d'une bande métallique quittant un train de laminage

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