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EP4146414B1 - Procédé de régulation en boucle ouverte ou en boucle fermée de la température d'une bande d'acier au cours d'un travail à chaud dans un laminoir à bandes à chaud - Google Patents

Procédé de régulation en boucle ouverte ou en boucle fermée de la température d'une bande d'acier au cours d'un travail à chaud dans un laminoir à bandes à chaud Download PDF

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Publication number
EP4146414B1
EP4146414B1 EP21716283.3A EP21716283A EP4146414B1 EP 4146414 B1 EP4146414 B1 EP 4146414B1 EP 21716283 A EP21716283 A EP 21716283A EP 4146414 B1 EP4146414 B1 EP 4146414B1
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Prior art keywords
temperature
process model
target value
target
hot
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German (de)
English (en)
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EP4146414A1 (fr
Inventor
Christoph Hassel
August Sprock
Kai GRYBEL
Guido BUSCHHOFF
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SMS Group GmbH
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SMS Group GmbH
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
    • C21D8/0426—Hot rolling
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/20—Temperature

Definitions

  • the invention relates to a method for controlling or regulating the temperature of a steel strip during hot forming in a hot strip mill.
  • the hot forming of a steel strip usually takes place in a hot strip mill.
  • This consists of different individual aggregates such as: B. furnaces, rolling stands, drives, unwinding and winding devices for the steel strip or cooling sections.
  • Such a hot strip mill is documented DE 11 2013 001434 T5 known, which forms the basis for the preamble of claims 1 and 15.
  • a variety of different devices or methods are known for controlling or regulating such units. These controls or regulations are essentially based on a target/actual value comparison and deriving appropriate corrective measures to maintain the target value.
  • the target values to be adhered to are defined based on empirical knowledge and/or previous process analyses.
  • a connection is usually formed in advance between the product properties of the steel strip and the target values of the unit to be set.
  • control or regulation of individual units of a hot strip mill is disadvantageous in that optimizing the process control of the individual unit does not always necessarily lead to the optimization of the entire manufacturing process.
  • energy and manufacturing costs can be saved through more dynamic process control.
  • the object of the invention is to further develop the known control or regulation of a hot strip mill in such a way that the setpoint specifications for the individual units are optimized across systems with regard to, for example, product properties of a steel strip.
  • a higher-level process model stores and / or exchanges target and / or actual values, including times, speeds, temperatures, cooling rates and / or heating rates, with at least two controls or regulations of the units online.
  • the higher-level process model determines based on the exchanged target and/or actual values and/or stored values and with the help of subordinate process models, such as a temperature model of the furnace, temperature model of the cooling section or a model of the forming in the hot strip mill, the temperature of the steel strip is predicted online for at least one point before the hot strip is coiled up.
  • the higher-level process model determines new setpoint specifications for the units and passes the setpoint specifications to the control or regulation of the unit in order to maintain the setpoint specification for the temperature of the steel strip.
  • the new setpoint specifications are determined with the help of an optimization algorithm that includes at least one subordinate process model.
  • the higher-level process model represents the current production status of the steel strip based on the target and/or actual values of the units.
  • suitable process models such as B. energy and material balances for a homogenization furnace or a statistical model for the structural development of a steel strip
  • the higher-level process model determines the development of a temperature curve before, for example, coiling in the future. This means that a difference between the setpoint specification for this individual unit and a possible deviation can be recognized at an early stage.
  • An optimization algorithm running in the higher-level optimization model can optimize setpoint specifications in such a way that the setpoint specification of the hot strip is achieved before coiling, taking into account previously defined optimization goals.
  • the optimization goals defined in advance can be, for example, production goals, in particular energy quantities, production quantities or quality goals.
  • the preliminary product is a slab with a thickness d B ⁇ 1 mm to d B ⁇ 300 mm, preferably d B ⁇ 50 mm to d B ⁇ 160 mm from a casting machine and that higher-level process model a casting speed, preferably between v G ⁇ 4 m/min and v G ⁇ 6 m/min, more preferably v G ⁇ 5 m/min and v G ⁇ 6 m/min and a casting machine outlet temperature, preferably T GE ⁇ 800 ° C, the slab is taken into account when determining the target specifications.
  • the optimization goal includes energy consumption, production quantity, process reliability, product properties, production costs and/or system wear.
  • a subordinate process model determines the structural development of the steel strip in the hot strip mill for at least one point, preferably before the hot strip is coiled.
  • the resulting structural development is crucial for the further material properties and/or processing of the steel strip. The more precise control or regulation of the structure development during the process makes it possible to react to deviations at an early stage and to reduce reject quantities and/or post-treatment.
  • a roughing stand and a finishing stand are ideally used.
  • advantageous temperature distributions and sequences can be set and these can also be better represented by a larger number of measuring and control points. This allows the higher-level process model to react better to deviations. Furthermore, this provides more options for intervening in the setpoint specifications of hot rolling.
  • a temperature setpoint of T FS ⁇ 850 ° C to T FS ⁇ 1050 ° C preferably T FS ⁇ 900 ° C to T FS ⁇ 1000 ° C, even more preferably T FS ⁇ 900 ° C to T FS ⁇ 950 ° C is specified by the higher-level process model.
  • a speed setpoint of v F ⁇ 0.4 m/s to v F ⁇ 1 m/s is preferably specified by the higher-level process model.
  • a temperature setpoint of Tvs ⁇ 1000°C to T VS ⁇ 1150°C is specified by the higher-level process model for the setpoint of the inlet temperature into the roughing stand.
  • the setpoint for the outlet temperature from the roughing stand is specified by the higher-level process model in a temperature range from T VE ⁇ 950°C to T VE ⁇ 1100°C.
  • a target value of d FS ⁇ 20 mm to d FS ⁇ 70 mm is specified by the higher-level process model for the target value of the inlet thickness into the finished stand.
  • the setpoint of the reel temperature is preferably specified by the process model in the range from T H ⁇ 30 ° C to T VE ⁇ 750 ° C, more preferably T H ⁇ 450 ° C to T H ⁇ 550 ° C.
  • the alloying element C has a content of 0.03% by weight to 0.15% by weight and / or manganese to a content of 0.50% by weight to 2.00 Weight percent in the steel strip is limited.
  • the optimized setpoint specifications for the production of a subsequent hot strip are the same Production objectives, in particular mechanical properties, can be used.
  • target and / or actual values are online through a higher-level process model with at least two controls or regulations of the units exchangeable and/or storable.
  • the higher-level process model based on the exchanged target and/or actual values and/or stored values and with the help of lower-level process models, determines the temperature of the steel strip online in advance for at least one point before the hot strip is coiled up and detects deviations from the predetermined temperature a setpoint specification at this point provides new setpoint values for the respective aggregates.
  • the new setpoint specifications are transferred from the higher-level process model to the control or regulation of the respective unit in order to maintain the setpoint specification for the temperature of the steel strip.
  • the new setpoint specifications are determined with the help of an optimization algorithm that includes at least one subordinate process model.
  • FIG. 1 shows a possible system diagram of a hot strip mill for producing a hot strip in which the method according to the invention is used.
  • the hot strip mill consists of a casting system 1, two shears 2, 10, two ovens 3, 6, two roughing stands 4, a transfer bar cooling system 5, an inductive heater 7, three finishing stands 8, a cooling section 9 and a reel 11 for winding up the hot strip.
  • a higher-level data processing system 12 has an integrated temperature and structure model. Setpoint and actual values are exchanged with the different systems or assigned regulations, controls and / or measuring devices and stored, for example, in the form of a database.
  • Figure 2 represents a flowchart with an exemplary networking of two units or controls of the two units with the respective process models.
  • the higher-level data processing system I transfers setpoints to the higher-level process model II of the hot strip mill. From these setpoints, for example a strength, the higher-level process model II determines a number of setpoints or setpoint ranges, for example a temperature curve with minimum and maximum temperatures, which are passed on to the lower-level process models Illa, b.
  • the subordinate process models III a, b derive specific target values for the respective unit. For example, a predetermined temperature curve with assigned times becomes a target specification for a burner control in an oven 3 or a target specification for controlling the amount of water in a cooling section 9. These are passed on to the corresponding controls of the respective units.
  • the subordinate process model III a, b can adjust the target specification.
  • An automatic optimization of the process model III a, b can also take place here using a self-learning algorithm. If the target actual size deviates from the target value V of the higher-level process model II, the target values are recalculated on the higher-level level II and adjusted if necessary.
  • Figure 3 shows a diagram with a target temperature curve B and a measured and pre-calculated temperature curve A.
  • the target temperature curve B begins with the end of the casting system 1 and describes the curve up to the reel 11.
  • the actual values are plotted from the end of the casting system 1 to the roughing stand 4.
  • the measured temperature is above the target temperature.
  • the higher-level process model II calculates the temperatures at the different points in the hot strip mill. Based on this temperature curve, different setpoints can be specified at different points in order to correct the temperature deviation. Different process models, material or structural models and/or optimization algorithms can be used to determine the best adaptation strategy.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Control Of Metal Rolling (AREA)
  • Heat Treatment Of Steel (AREA)
  • Feedback Control In General (AREA)

Claims (15)

  1. Procédé de commande ou de régulation de la température d'une bande d'acier avec les éléments d'alliage en % en poids min max C 0 1 Mn 0 2,5
    lors du travail à chaud d'un précurseur avec une épaisseur entre dV ≥ 1 mm et dV ≤ 300 mm en une bande à chaud avec une épaisseur de bande à chaud dWB ≤ 25 mm et une largeur de bande à chaud entre bWB ≥ 900 mm et bWB≤2100 mm, une température de dévidoir cible TH ≥ 30 °C jusqu'à TH ≤ 750 °C dans un laminoir à bandes à chaud, en particulier TH ≥ 400 °C jusqu'à TH ≤ 750 °C, présentant au moins un four (3) pour le chauffage et/ou l'homogénéisation de température du précurseur, au moins une cage de laminage pour le laminage à chaud du précurseur, un trajet de refroidissement (9) pour le refroidissement ciblé de la bande à chaud après le travail ainsi qu'un dévidoir (11) pour l'enroulement de la bande à chaud en une bobine, dans lequel l'agrégat individuel respectif présente une propre commande ou régulation pour les valeurs de consigne prédéfinies,
    caractérisé en ce que
    - sur un système de traitement de données (I) associé au laminoir à bandes à chaud, un modèle de processus supérieur (II) échange et/ou enregistre en ligne des valeurs de consigne et/ou des valeurs réelles présentant des temps, vitesses, températures, taux de refroidissement et/ou taux de chauffage, avec au moins deux commandes ou régulations des agrégats ;
    - le modèle de processus supérieur (II) prédétermine en ligne la température de la bande d'acier pour au moins un point avant le bobinage de la bande à chaud sur la base des valeurs de consigne et/ou des valeurs réelles échangées et/ou des valeurs enregistrées et à l'aide de modèles de processus inférieurs (IIIa, IIIb); et
    - le modèle de processus supérieur (II) détermine, en cas de divergences de la température prédéterminée par rapport à une spécification de valeurs de consigne au niveau de ce point, de nouvelles spécifications de valeurs de consigne des agrégats, et les transmet à la commande ou régulation de l'agrégat afin de conserver la spécification de valeurs de consigne pour la température de la bande d'acier ; et
    - la détermination des nouvelles spécifications de valeurs de consigne est effectuée à l'aide d'un algorithme d'optimisation incluant au moins un modèle de processus inférieur (IIIa, IIIb).
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    - le précurseur est une brame avec une épaisseur dB≥50 mm jusqu'à dB ≤ 160 mm issue d'une machine de coulée ; et
    - le modèle de processus supérieur (II) tient compte d'une vitesse de coulée, de préférence entre VG ≥ 4 m/min et VG ≤ 6 m/min, plus préférentiellement VG ≥ 5 m/min et VG ≤ 6 m/min et une température de sortie de machine de coulée, de préférence TGE ≥ 800 °C, de la brame lors de la détermination des valeurs cibles.
  3. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'objectif d'optimisation comprend la consommation d'énergie, la quantité de production, la sécurité de processus, des propriétés de produit, des coûts de production et/ou l'usure des installations.
  4. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    un modèle de processus inférieur (IIIa, IIIb) détermine l'évolution de structure de la bande d'acier dans le laminoir à bandes à chaud pour au moins un point, de préférence avant le bobinage de la bande à chaud.
  5. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    une cage ébaucheuse (4) et une cage finisseuse (8) sont utilisées lors du travail à chaud.
  6. Procédé selon la revendication 4,
    caractérisé en ce que
    pour la valeur de consigne de la température d'entrée dans la cage finisseuse, une valeur de consigne de température de TFS = 850 °C jusqu'à TFS = 1050 °C, de préférence TFS = 900 °C jusqu'à TFS = 1000°C, encore plus préférentiellement TFS = 900 °C jusqu'à TFS = 950 °C est prédéterminée par le modèle de processus supérieur.
  7. Procédé selon l'une quelconque des revendications 4 à 5,
    caractérisé en ce que
    pour la valeur de consigne de la température de sortie de la cage finisseuse (8), une valeur de consigne de température de TFE ≥ 750 °C jusqu'à TFE ≤ 950 °C, de préférence TFE ≥ 750°C jusqu'à TFE ≤ 900 °C, encore plus préférentiellement TFE ≥ 800 °C jusqu'à TFE ≤ 850 °C est prédéterminée par le modèle de processus supérieur (II).
  8. Procédé selon l'une quelconque des revendications 4 à 6,
    caractérisé en ce que
    pour la valeur de consigne de la vitesse d'entrée dans la cage finisseuse (8), une valeur de consigne de vitesse de VF ≥ 0,4 m/s jusqu'à VF ≤ 1 m/s est prédéterminée par le modèle de processus supérieur (II).
  9. Procédé selon l'une quelconque des revendications 4 à 7,
    caractérisé en ce que
    pour la valeur de consigne de la température d'entrée dans la cage ébaucheuse (4), une valeur de consigne de température de TVS ≥ 1000°C jusqu'à TVS ≤ 1150 °C est prédéterminée par le modèle de processus supérieur (II).
  10. Procédé selon l'une quelconque des revendications 4 à 8,
    caractérisé en ce que
    pour la valeur de consigne de la température de sortie de la cage ébaucheuse (4), une valeur de consigne de température de TVE ≥ 950 °C jusqu'à TVE ≤ 1100°C est prédéterminée par le modèle de processus supérieur (II).
  11. Procédé selon l'une quelconque des revendications 4 à 9,
    caractérisé en ce que
    pour la valeur de consigne de l'épaisseur d'entrée dans la cage finisseuse (8), une valeur de consigne de dFS ≥ 20 mm jusqu'à dFS ≤ 70 mm est prédéterminée par le modèle de processus supérieur (II).
  12. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    pour la valeur de consigne de la température de dévidoir, une valeur de consigne de température de TH ≥ 30 °C jusqu'à TVE ≤ 750 °C, de préférence TH ≥ 450 °C jusqu'à TH ≤ 550 °C est prédéterminée par le modèle de processus supérieur (II).
  13. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'élément d'alliage C est limité à une teneur de 0,03 % en poids, jusqu'à 0,15 % en poids et/ou Mn à une teneur de 0,50 % en poids jusqu'à 2,00 % en poids dans la bande d'acier.
  14. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    les spécification de valeurs de consigne optimisées sont utilisées pour la fabrication d'une bande à chaud suivante avec des mêmes objectifs de production, en particulier des propriétés mécaniques.
  15. Dispositif pour la commande ou la régulation de la température d'une bande d'acier selon un procédé selon l'une quelconque des revendications 1 à 14,
    caractérisé en ce que
    - sur un système de traitement de données (I) associé au laminoir à bandes à chaud, des valeurs de consigne et/ou réelles présentant des temps, vitesses, températures, taux de refroidissement et/ou taux de chauffage, avec au moins deux commandes ou régulations des agrégats peuvent être échangées et/ou enregistrées en ligne par un modèle de processus supérieur(Il) ;
    - la température de la bande d'acier pour au moins un point avant le bobinage de la bande à chaud peut être prédéterminée en ligne par le modèle de processus supérieur (II) sur la base des valeurs de consigne et/ou des valeurs réelles échangées et/ou valeurs enregistrées et à l'aide de modèles de processus inférieurs (IIIa, IIIb) ; et
    - le modèle de processus supérieur (II) détermine, en cas de divergences de la température prédéterminée par rapport à une spécification de valeurs de consigne au niveau de ce point, de nouvelles spécifications de valeurs de consigne des agrégats respectifs, et les transmet à la commande ou à la régulation de l'agrégat respectif afin de conserver la spécification de valeurs de consigne pour la température de la bande d'acier ; et
    - la détermination des nouvelles spécifications de valeurs de consigne est effectuée à l'aide d'un algorithme d'optimisation incluant au moins un modèle de processus inférieur (IIIa, IIIb).
EP21716283.3A 2020-05-05 2021-03-25 Procédé de régulation en boucle ouverte ou en boucle fermée de la température d'une bande d'acier au cours d'un travail à chaud dans un laminoir à bandes à chaud Active EP4146414B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020205655.2A DE102020205655A1 (de) 2020-05-05 2020-05-05 Verfahren zum Steuern oder Regeln der Temperatur eines Stahlbandes bei der Warmumformung in einer Warmbandstraße
PCT/EP2021/057720 WO2021223937A1 (fr) 2020-05-05 2021-03-25 Procédé de régulation en boucle ouverte ou en boucle fermée de la température d'une bande d'acier au cours d'un travail à chaud dans un laminoir à bandes à chaud

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EP4146414A1 EP4146414A1 (fr) 2023-03-15
EP4146414B1 true EP4146414B1 (fr) 2024-03-13

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US (1) US12492442B2 (fr)
EP (1) EP4146414B1 (fr)
JP (1) JP7539626B2 (fr)
CN (1) CN115551652A (fr)
DE (1) DE102020205655A1 (fr)
WO (1) WO2021223937A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE102020205655A1 (de) * 2020-05-05 2021-11-11 Sms Group Gmbh Verfahren zum Steuern oder Regeln der Temperatur eines Stahlbandes bei der Warmumformung in einer Warmbandstraße
DE102022210057A1 (de) * 2022-09-23 2024-03-28 Sms Group Gmbh Verfahren und Computerprogramm zum Betreiben einer Produktionsanlage für ein Metallprodukt
CN115608793B (zh) * 2022-12-20 2023-04-07 太原科技大学 一种机理融合数据的精轧温度调控方法
DE102023135965A1 (de) * 2023-12-20 2025-06-26 Sms Group Gmbh Verfahren zum Betrieb einer Warmbandproduktionsanlage und Warmbandproduktionsanlage zur Herstellung eines Warmbandes

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US20230203612A1 (en) 2023-06-29
DE102020205655A1 (de) 2021-11-11
US12492442B2 (en) 2025-12-09
JP7539626B2 (ja) 2024-08-26
WO2021223937A1 (fr) 2021-11-11
CN115551652A (zh) 2022-12-30
EP4146414A1 (fr) 2023-03-15

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