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EP4146414A1 - Method for the open-loop or closed-loop control of the temperature of a steel strip during hot working in a hot strip mill - Google Patents

Method for the open-loop or closed-loop control of the temperature of a steel strip during hot working in a hot strip mill

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Publication number
EP4146414A1
EP4146414A1 EP21716283.3A EP21716283A EP4146414A1 EP 4146414 A1 EP4146414 A1 EP 4146414A1 EP 21716283 A EP21716283 A EP 21716283A EP 4146414 A1 EP4146414 A1 EP 4146414A1
Authority
EP
European Patent Office
Prior art keywords
temperature
setpoint
process model
hot strip
hot
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP21716283.3A
Other languages
German (de)
French (fr)
Other versions
EP4146414B1 (en
Inventor
Christoph Hassel
August Sprock
Kai GRYBEL
Guido BUSCHHOFF
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Group GmbH
Original Assignee
SMS Group GmbH
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Publication of EP4146414A1 publication Critical patent/EP4146414A1/en
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Classifications

    • 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 units such as B. furnaces, rolling stands, drives, unwinding and winding devices for the steel strip or cooling lines.
  • a large number of different devices or methods are known for controlling or regulating such units. These controls or regulation are essentially based on a target / actual value comparison and a derivation of appropriate corrective measures for maintaining the target value.
  • the setpoints to be adhered to are defined on the basis of experience and / or previous process analyzes.
  • a connection is usually established in advance between the product properties of the steel strip and the setpoint values to be set for the unit. During the production of the steel strip, there is usually a complex relationship between the most varied of setpoints and the desired product properties.
  • unit-related process models are used to develop suitable setpoints that lead to the desired product properties.
  • the complexity of the interrelationship and / or effort for example statistical models, analytical models or neural networks are used for these unit-related process models.
  • a disadvantage of such control concepts for hot strip mills having multiple units is that interactions when changing target values or actual values are not mapped across the various units by the unit-related process models and / or controls or regulations of the units. Particularly in the production of steel strips with high demands on the material quality, it is difficult to optimize the complex interaction of time, temperature, structure development and these quasi-static individual unit controls.
  • control or regulation of individual units of a hot strip mill is disadvantageous in that an optimization of the process control of the individual unit does not always necessarily lead to the optimization of the entire production process.
  • energy and manufacturing costs can be saved through more dynamic process control.
  • the object of the invention is to further develop the known open-loop or closed-loop control of a hot strip mill in such a way that the setpoint specifications for the individual units are optimized across all 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, online with at least two controls or regulators of the units.
  • the higher-level process model determines on the basis of the exchanged setpoints 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 for at least one point before the coiling of the hot strip online.
  • the higher-level process model determines new target value specifications of the units at this point, transfers the target value specifications to the control or regulation of the unit in order to maintain the target value specifications for the temperature of the steel strip.
  • the new target value specifications are determined with the aid of an optimization algorithm that includes at least one subordinate process model.
  • the higher-level process model maps a current production status of the steel strip on the basis of the setpoint and / or actual values of the units.
  • suitable process models such as B. Energy and material balances for one
  • the higher-level process model determines the development of a temperature profile before, for example, reeling into the future. In this way, 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 superordinate optimization model can optimize target value specifications in such a way that the target value specification of the hot strip is undershot before it is reeled
  • optimization goals specified in advance can be, for example, production goals, in particular energy quantities, production quantities or quality goals.
  • the intermediate product is a slab with a thickness d ß ⁇ 1 mm to d ß ⁇ 300 mm, preferably d ß > 50 mm to d B ⁇ 160 mm from a casting machine and that
  • the higher-level process model has 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 TGE ⁇ 800 ° C , the slab taken into account when determining the target specifications.
  • the optimization target includes the energy consumption, the production quantity, the process reliability, product properties, production costs and / or the system wear, these targets, the preferred reference variables in the steel production area.
  • 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 structure development is decisive for the further material properties and / or processing of the steel strip. The more precise control or regulation of the structure development in the course of the process makes it possible to react early to deviations and the reject quantities and / or
  • a roughing stand and a finishing stand are used, according to claim 5.
  • advantageous temperature distributions and sequences can be set and these can also be better mapped through a larger number of measurement and control points. This enables the higher-level process model to react better to deviations. Furthermore, this gives more options for intervening in the setpoint specifications for hot rolling.
  • a temperature target value of TFS ⁇ 850 ° C to TFS ⁇ 1050 ° C preferably TFS ⁇ 900 ° C to TFS ⁇ 1000 ° C, even more preferably TFS ⁇ 900 ° C to TFS ⁇ 950 ° C is specified by the higher-level process model.
  • TFE ⁇ 800 ° C to TFE ⁇ 850 ° C is specified by the higher-level process model.
  • a target speed value 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 Tvs ⁇ 1150 ° C is specified by the higher-level process model for the setpoint of the inlet temperature in 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 TVE ⁇ 950 ° C to TVE ⁇ 1100 ° C.
  • a target value of Ü FS ⁇ 20 mm to Ü FS ⁇ 70 mm is specified by the higher-level process model.
  • the nominal value of the flask temperature is preferably specified by the process model in the range from TH ⁇ 30 ° C to TVE ⁇ 750 ° C, more preferably TH ⁇ 450 ° C to TH ⁇ 550 ° C.
  • the alloying element C has a content of 0.03% by weight to 0.15% by weight and / or manganese has a content of 0.50% by weight to 2.00 %
  • the optimized target value specifications for the production of a subsequent hot strip are the same Production goals, especially mechanical property are used.
  • a higher-level process model, setpoint and / or actual values comprising times, speeds, temperature, cooling rates and / or heating rates, with at least two controls or regulators of the units, is preferably exchanged online - and / or storable.
  • the higher-level process model determines the temperature of the steel strip online for at least one point before the hot strip is wound up on the basis of the exchanged setpoint and / or actual values and / or stored values and with the help of subordinate process models and determines the temperature of the predefined temperature deviations from a setpoint specification at this point new setpoint specifications of 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 target value specifications are determined with the aid of an optimization algorithm that includes at least one subordinate process model.
  • Figure 1 System diagram for the hot strip mill
  • FIG. 1 shows a possible system scheme of a hot strip mill for the production of a hot strip in which the method according to the invention is used.
  • the hot strip mill consists of a casting plant 1, two shears 2, 10, two furnaces 3, 6, two roughing stands 4, a transfer bar cooling 5, an inductive heating system 7, three finishing stands 8, a cooling section 9 and a flasher 11 for winding 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 are stored, for example, in the form of a database.
  • FIG. 2 shows a flow chart 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 setpoint values to the higher-level process model II of the hot strip mill. From these setpoint values, for example a strength, the superordinate process model II determines a number of setpoint values or setpoint ranges, for example a temperature profile with min. And max.temperature, which are transferred to the subordinate process models lila, b.
  • the subordinate process models III a, b derive specific setpoint values for the respective unit from this. For example, a setpoint for a burner control in an oven 3 or a setpoint for controlling the amount of water in a cooling section 9 is derived from a predefined temperature curve with assigned times.
  • the subordinate process model III a, b can adjust the target value.
  • An automatic optimization of the process model III a, b can also take place here by means of a self-learning algorithm. If the target actual value deviates from the target value specification V of the superordinate process model II, the setpoint values are recalculated on the superordinate level II and, if necessary, adjusted.
  • FIG. 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 at the end of the casting plant 1 and describes the curve up to the reel 11.
  • the actual values are plotted from the end of the casting plant 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 various points in the hot strip mill in advance. On the basis of this temperature curve, different setpoints can be specified anew at different points in order to correct the temperature deviation. Different
  • Process models, material or microstructure models and / or optimization algorithms can be used to determine the best adaptation strategy.

Landscapes

  • 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)

Abstract

the invention relates to a method for the open-loop or closed-loop control of the temperature of a steel strip during hot working in a hot strip mill. A higher-level open-loop or closed-loop control involves a process model which predicts the temperature development of the hot strip. The target values of the individual units are adjusted on the basis of this predicted temperature development.

Description

Verfahren zum Steuern oder Regeln der Temperatur eines Stahlbandes bei der Warmumformung in einer Warmbandstraße Method for controlling or regulating the temperature of a steel strip during hot forming in a hot strip mill

Gebiet: Die Erfindung betrifft ein Verfahren zum Steuern oder Regeln der Temperatur eines Stahlbandes bei der Warmumformung in einer Warmbandstraße. Field: The invention relates to a method for controlling or regulating the temperature of a steel strip during hot forming in a hot strip mill.

Stand der Technik: State of the art:

Die Warmumformung eines Stahlbandes findet üblicherweise in einer Warmbandstraße statt. Diese besteht aus unterschiedlichen einzelnen Aggregaten wie z. B. Öfen, Walzgerüsten, Antrieben, Ab- und Aufwickeleinrichtungen des Stahlbandes oder Kühlstrecken. Für die Steuerung bzw. Regelung derartiger Aggregate ist eine Vielzahl von unterschiedlichen Vorrichtung oder Verfahren bekannt. Diese Steuerungen bzw. Regelung basieren im Wesentlichen auf einem Soll-Ist-Wertvergleich und einem Ableiten von entsprechenden Korrekturmaßnahmen zum Einhalten des Sollwertes. Dabei werden die einzuhaltenden Sollwerte auf Basis von Erfahrungswissen und / oder vorhergehenden Prozessanalysen definiert. Weiterhin wird üblicherweise im Vorfeld ein Zusammenhang zwischen Produkteigenschaften des Stahlbandes und den einzustellenden Sollwerten des Aggregates gebildet. Üblicherweise ist bei der Herstellung des Stahlbandes ein komplexer Zusammenhang zwischen verschiedensten Sollwerten und anzustrebenden Produkteigenschaften gegeben. The hot forming of a steel strip usually takes place in a hot strip mill. This consists of different individual units such as B. furnaces, rolling stands, drives, unwinding and winding devices for the steel strip or cooling lines. A large number of different devices or methods are known for controlling or regulating such units. These controls or regulation are essentially based on a target / actual value comparison and a derivation of appropriate corrective measures for maintaining the target value. The setpoints to be adhered to are defined on the basis of experience and / or previous process analyzes. Furthermore, a connection is usually established in advance between the product properties of the steel strip and the setpoint values to be set for the unit. During the production of the steel strip, there is usually a complex relationship between the most varied of setpoints and the desired product properties.

Durch die zunehmende Digitalisierung der Anlagentechnik werden für die Entwicklung geeigneter Sollwerte die zu den gewünschten Produkteigenschaften führen, aggregatbezogene Prozessmodelle verwendet. In Abhängigkeit vom Datenstand, Komplexität der Zusammenhäng und / oder Aufwand werden dafür beispielsweise statistische Modelle, analytische Modelle oder neuronale Netze für diese aggregatbezogenen Prozessmodelle verwendet. Nachteilig bei derartigen Regelungskonzepten für Warmbandstraßen aufweisend mehrere Aggregate ist, dass Wechselwirkungen bei Änderung von Sollwert- Vorgaben oder Ist-Werten über die verschiedenen Aggregate nicht durch die aggregatbezogenen Prozessmodelle und / oder Steuerungen bzw. Regelungen der Aggregate abgebildet werden. Insbesondere bei der Herstellung von Stahlbändern mit hohen Anforderungen an die Werkstoffgüte kann die komplexe Wechselwirkung von Zeit, Temperatur, Gefügeentwicklung und durch diese quasistatischen Einzelaggregatregelungen schwer optimiert werden. Weiterhin ist die Steuerung bzw. Regelung von Einzelaggregaten einer Warmbandstraße dahingehend von Nachteil, dass eine Optimierung der Prozessführung des Einzelaggregates nicht immer zwingend zur Optimierung des gesamten Herstellungsprozesses führt. Insbesondere in kombinierten Anlagen mit beispielsweise Stranggussanlagen können durch dynamischere Prozessführungen Energie- und Herstellungskosten eingespart werden. Due to the increasing digitalization of plant technology, unit-related process models are used to develop suitable setpoints that lead to the desired product properties. Depending on the data status, the complexity of the interrelationship and / or effort, for example statistical models, analytical models or neural networks are used for these unit-related process models. A disadvantage of such control concepts for hot strip mills having multiple units is that interactions when changing target values or actual values are not mapped across the various units by the unit-related process models and / or controls or regulations of the units. Particularly in the production of steel strips with high demands on the material quality, it is difficult to optimize the complex interaction of time, temperature, structure development and these quasi-static individual unit controls. Furthermore, the control or regulation of individual units of a hot strip mill is disadvantageous in that an optimization of the process control of the individual unit does not always necessarily lead to the optimization of the entire production process. In particular in combined systems with, for example, continuous casting systems, energy and manufacturing costs can be saved through more dynamic process control.

Aufgabe der Erfindung: Object of the invention:

Aufgabe der Erfindung ist es, die bekannte Steuerung bzw. Regelung einer Warmbandstraße dahingehend weiterzuentwickeln, dass anlagenübergreifend die Sollwert-Vorgaben für die Einzelaggregate im Hinblick auf beispielsweise Produkteigenschaften eines Stahlbandes optimiert werden. The object of the invention is to further develop the known open-loop or closed-loop control of a hot strip mill in such a way that the setpoint specifications for the individual units are optimized across all systems with regard to, for example, product properties of a steel strip.

Erfindung: Die Aufgabe der Erfindung wird mit einem Verfahren mit den Merkmalen des Anspruchs 1 gelöst. Auf einem einer Warmbandstraße zugeordneten Datenverarbeitungssystem speichert und / oder tauscht ein übergeordnetes Prozessmodell Soll- und / oder Ist-Wert, aufweisend Zeiten, Geschwindigkeiten, Temperatur, Abkühlraten und/oder Aufheizraten, mit zumindest zwei Steuerungen oder Regelungen der Aggregate online aus. Das übergeordnete Prozessmodel bestimmt auf Basis der ausgetauschten Soll- und / oder Istwerte und / oder gespeicherten Werten und mit Hilfe von untergeordneten Prozessmodellen, wie beispielsweise ein Temperaturmodell des Ofens, Temperaturmodell der Kühlstrecke oder ein Modell der Umformung in der Warmbandstraße, die Temperatur des Stahlbandes für zumindest einen Punkt vor dem Aufhaspeln des Warmbandes online voraus. Das übergeordnete Prozessmodell ermittelt bei Abweichungen der vorausbestimmten Temperatur von einer Sollwert-Vorgabe an diesem Punkt neue Sollwert-Vorgaben der Aggregate, übergibt die Sollwert- Vorgaben an die Steuerung oder Regelung des Aggregates, um die Sollwert- Vorgabe für die Temperatur des Stahlbandes einzuhalten. Die Ermittlung der neuen Sollwert-Vorgaben erfolgt mit Hilfe von einem zumindest ein untergeordnetes Prozessmodell einschließenden Optimierungsalgorithmus. Invention: The object of the invention is achieved with a method having the features of claim 1. On a data processing system assigned to a hot strip mill, a higher-level process model stores and / or exchanges target and / or actual values, including times, speeds, temperatures, cooling rates and / or heating rates, online with at least two controls or regulators of the units. The higher-level process model determines on the basis of the exchanged setpoints 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 for at least one point before the coiling of the hot strip online. If the predetermined temperature deviates from a target value specification, the higher-level process model determines new target value specifications of the units at this point, transfers the target value specifications to the control or regulation of the unit in order to maintain the target value specifications for the temperature of the steel strip. The new target value specifications are determined with the aid of an optimization algorithm that includes at least one subordinate process model.

Das übergeordnete Prozessmodell bildet auf Basis der Soll- und/oder Istwerte der Aggregate einen aktuellen Produktionszustand des Stahlbandes ab. Durch geeignete Prozessmodelle, wie z. B. Energie- und Stoffbilanzen für einenThe higher-level process model maps a current production status of the steel strip on the basis of the setpoint and / or actual values of the units. Using suitable process models, such as B. Energy and material balances for one

Homogenisierungsofen oder ein statistisches Modell für diejenigeHomogenizing furnace or a statistical model for that

Gefügeentwicklung eines Stahlbandes, bestimmt das übergeordnete Prozessmodell die Entwicklung eines Temperaturverlaufes vor beispielsweise dem Aufhaspeln in die Zukunft. Hierdurch kann ein Unterschied zwischen Sollwert- Vorgabe für dieses Einzelaggregat und einer möglichen Abweichung frühzeitig erkannt werden. Ein im übergeordneten Optimierungsmodell ablaufender Optimierungsalgorithmus kann Sollwert-Vorgaben dahingehend optimieren, dass die Sollwert-Vorgabe des Warmbandes vor dem Aufhaspeln unterStructural development of a steel strip, the higher-level process model determines the development of a temperature profile before, for example, reeling into the future. In this way, 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 superordinate optimization model can optimize target value specifications in such a way that the target value specification of the hot strip is undershot before it is reeled

Berücksichtigung im Vorfeld festgelegter Optimierungsziele erreicht wird. Die im Vorfeld festgelegten Optimierungsziele können beispielsweise Produktionsziele, insbesondere Energiemengen, Produktionsmengen oder Qualitätsziele sein. Consideration of previously defined optimization goals is achieved. The optimization goals specified in advance can be, for example, production goals, in particular energy quantities, production quantities or quality goals.

Bevorzugte Ausprägungen des Verfahrens sind in den Merkmalen der Ansprüche 2 bis 14 dargestellt. Gemäß dem Anspruch 2 ist es bevorzugt, dass das Vorprodukt einer Bramme mit einer Dicke dß ^ 1 mm bis dß < 300 mm, bevorzugt dß > 50 mm bis dB < 160 mm aus einer Gießmaschine ist und dass das übergeordnete Prozessmodell eine Gießgeschwindigkeit, vorzugsweise zwischen VG — 4 m/min und VG ^ 6 m/min, mehr bevorzugt VG ^ 5 m/min und VG ^ 6 m/min und eine Gießmaschinenauslauftemperatur, vorzugsweise TGE ^ 800°C, der Bramme bei der Bestimmung der Soll-Vorgaben berücksichtigt. Preferred versions of the method are shown in the features of claims 2 to 14. According to claim 2, it is preferred that the intermediate product is a slab with a thickness d ß ^ 1 mm to d ß <300 mm, preferably d ß > 50 mm to d B <160 mm from a casting machine and that The higher-level process model has 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 TGE ^ 800 ° C , the slab taken into account when determining the target specifications.

Bevorzugt umfasst, gemäß dem Anspruch 3, das Optimierungsziel den Energieverbrauch, die Produktionsmenge, die Prozesssicherheit, Produkteigenschaften, Produktionskosten und/oder den Anlagenverschleiß diese Ziele, die bevorzugten Führungsgrößen im Stahlherstellungsbereich ab. Preferably, according to claim 3, the optimization target includes the energy consumption, the production quantity, the process reliability, product properties, production costs and / or the system wear, these targets, the preferred reference variables in the steel production area.

Weiterhin ist es, gemäß dem Anspruch 4, bevorzugt, wenn ein untergeordnetes Prozessmodell die Gefügeentwicklung des Stahlbandes in der Warmbandstraße für zumindest einen Punkt, vorzugsweise vor dem Haspeln des Warmbandes, bestimmt. Neben der optimierten Temperaturführung ist die daraus resultierende Gefügeentwicklung für die weiteren Werkstoffeigenschaften und / oder Verarbeitung des Stahlbandes entscheidend. Die genauere Steuerung bzw. Regelung der Gefügeentwicklung im Prozessverlauf ermöglicht es, frühzeitig auf Abweichungen zu reagieren und die Ausschussmengen und / oderFurthermore, according to claim 4, it is preferred if 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. In addition to the optimized temperature control, the resulting structure development is decisive for the further material properties and / or processing of the steel strip. The more precise control or regulation of the structure development in the course of the process makes it possible to react early to deviations and the reject quantities and / or

Nachbehandlungen zu reduzieren. Reduce follow-up treatments.

Bei der Warmumformung werden, gemäß dem Anspruch 5, idealerweise ein Vorgerüst und ein Fertiggerüst verwendet. Durch die Aufteilung der Warmumformung in ein Vorgerüst und ein Fertiggerüst können vorteilhafte Temperaturverteilungen und -abfolgen eingestellt werden und diese auch durch eine größere Anzahl von Mess- und Regelpunkten besser abgebildet werden. Dadurch kann das übergeordnete Prozessmodell besser auf Abweichungen reagieren. Weiterhin sind dadurch mehr Möglichkeiten zum Eingriff in Sollwert- Vorgaben des Warmwalzens gegeben. Bevorzugt ist es, gemäß dem Anspruch 6 und 7, dass für den Sollwert der Einlauftemperatur in das Fertiggerüst ein Temperatursollwert von TFS ^ 850°C bis TFS ^ 1050°C, vorzugsweise TFS ^ 900°C bis TFS ^ 1000°C, noch mehr bevorzugt TFS ^ 900°C bis TFS ^ 950°C durch das übergeordnete Prozessmodell vorgegeben wird. Weiterhin ist es bevorzugt, wenn für den Sollwert der Auslauftemperatur aus dem Fertiggerüst ein Temperatursollwert innerhalb von TFE ^ 750°C bis TFE ^ 950°C, vorzugsweise TFE ^ 750°C bis TFE ^ 900°C, noch mehr bevorzugtIn the case of hot forming, ideally a roughing stand and a finishing stand are used, according to claim 5. By dividing the hot forming into a roughing stand and a finishing stand, advantageous temperature distributions and sequences can be set and these can also be better mapped through a larger number of measurement and control points. This enables the higher-level process model to react better to deviations. Furthermore, this gives more options for intervening in the setpoint specifications for hot rolling. It is preferred, according to claims 6 and 7, that for the target value of the inlet temperature in the finishing stand, a temperature target value of TFS ^ 850 ° C to TFS ^ 1050 ° C, preferably TFS ^ 900 ° C to TFS ^ 1000 ° C, even more preferably TFS ^ 900 ° C to TFS ^ 950 ° C is specified by the higher-level process model. Furthermore, it is preferred if a temperature setpoint within TFE ^ 750 ° C to TFE ^ 950 ° C, preferably TFE ^ 750 ° C to TFE ^ 900 ° C, even more preferred for the setpoint of the outlet temperature from the finishing stand

TFE ^ 800°C bis TFE ^ 850°C durch das übergeordnete Prozessmodell vorgegeben wird. TFE ^ 800 ° C to TFE ^ 850 ° C is specified by the higher-level process model.

Für den Sollwert der Einlaufgeschwindigkeit in das Fertiggerüst wird, gemäß dem Anspruch 8, bevorzugt ein Geschwindigkeitssollwert von VF ^ 0,4 m/s bis VF ^ 1 m/s durch das übergeordnete Prozessmodell vorgegeben. For the target value of the entry speed into the finishing stand, according to claim 8, a target speed value of V F ^ 0.4 m / s to V F ^ 1 m / s is preferably specified by the higher-level process model.

Gemäß dem Anspruch 9 und 10 ist für den Sollwert der Einlauftemperatur in das Vorgerüst ein Temperatursollwert von Tvs ^ 1000°C bis Tvs ^ 1150°C durch das übergeordnete Prozessmodell vorgegeben. Der Sollwert für die Auslauftemperatur aus dem Vorgerüst wird durch das übergeordnete Prozessmodel in einem Temperaturbereich von TVE ^ 950°C bis TVE ^ 1100°C vorgegeben. According to claims 9 and 10, a temperature setpoint of Tvs ^ 1000 ° C to Tvs ^ 1150 ° C is specified by the higher-level process model for the setpoint of the inlet temperature in 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 TVE ^ 950 ° C to TVE ^ 1100 ° C.

Idealerweise wird, gemäß dem Anspruch 11 und 12, für den Sollwert der Einlaufdicke in das Fertiggerüst ein Sollwert von ÜFS ^ 20 mm bis ÜFS ^ 70 mm durch das übergeordnete Prozessmodell vorgegeben. Der Sollwert der Flaspeltemperatur wird bevorzugt durch das Prozessmodell in dem Bereich von TH ^ 30°C bis TVE ^ 750°C, mehr bevorzugt TH ^ 450°C bis TH ^ 550°C vorgegeben. Ideally, according to claims 11 and 12, for the target value of the inlet thickness in the finishing stand, a target value of Ü FS ^ 20 mm to Ü FS ^ 70 mm is specified by the higher-level process model. The nominal value of the flask temperature is preferably specified by the process model in the range from TH ^ 30 ° C to TVE ^ 750 ° C, more preferably TH ^ 450 ° C to TH ^ 550 ° C.

Gemäß dem Anspruch 13 ist es bevorzugt, wenn das Legierungselement C auf einen Gehalt von 0,03 Gew.-% bis 0,15 Gew.-% und/oder Mangan auf einen Gehalt von 0,50 Gew.-% bis 2,00 Gew.-% im Stahlband beschränkt ist. Gemäß dem Anspruch 14 ist es bevorzugt, wenn die optimierten Sollwert- Vorgaben für die Herstellung eines nachfolgenden Warmbandes mit gleichen Produktionszielen, insbesondere mechanischen Eigenschaft verwendet werden. Flierdurch können bereits existierende optimierte Prozessabläufe, die durch die entsprechenden Sollwert-Vorgaben beschrieben sind, auf Weiterproduktion des gleichen Werkstoffes oder Stahlbandtyps bezogen werden. Dies spart Optimierungszeit und ermöglicht es, auf schleichende Anlagenänderungen im Vorfeld zu reagieren. According to claim 13, it is preferred if the alloying element C has a content of 0.03% by weight to 0.15% by weight and / or manganese has a content of 0.50% by weight to 2.00 % By weight in the steel strip is limited. According to claim 14, it is preferred if the optimized target value specifications for the production of a subsequent hot strip are the same Production goals, especially mechanical property are used. Through this, already existing optimized process sequences, which are described by the corresponding target value specifications, can be related to further production of the same material or steel strip type. This saves optimization time and makes it possible to react to creeping system changes in advance.

Bevorzugt ist, gemäß dem Anspruch 15, auf einem der Warmbandstraße zugeordneten Datenverarbeitungssystem, ein übergeordnetes Prozessmodell Soll- und / oder Ist-Werten, aufweisend Zeiten, Geschwindigkeiten, Temperatur, Abkühlraten und / oder Aufheizraten, mit zumindest zwei Steuerungen oder Regelungen der Aggregate online austausch- und / oder speicherbar. Das übergeordnete Prozessmodell bestimmt auf Basis der ausgetauschten Soll- und / oder Ist-Werten und / oder gespeicherten Werten und mit Hilfe von untergeordneten Prozessmodellen die Temperatur des Stahlbandes für zumindest einen Punkt vor dem Aufhaspeln des Warmbandes online voraus und ermittelt bei Abweichungen der vorausbestimmten Temperatur von einer Sollwertvorgabe an diesem Punkt neue Sollwertvorgaben der jeweiligen Aggregate. Die neuen Sollwertvorgaben werden vom übergeordneten Prozessmodell an die Steuerung oder Regelung des jeweiligen Aggregates übergeben, um die Sollwertvorgabe für die Temperatur des Stahlbandes einzuhalten. Dabei erfolgt die Ermittlung der neuen Sollwertvorgaben mit Hilfe von einem zumindest ein untergeordnetes Prozessmodell einschließenden Optimierungsalgorithmus. According to claim 15, on a data processing system assigned to the hot strip mill, a higher-level process model, setpoint and / or actual values, comprising times, speeds, temperature, cooling rates and / or heating rates, with at least two controls or regulators of the units, is preferably exchanged online - and / or storable. The higher-level process model determines the temperature of the steel strip online for at least one point before the hot strip is wound up on the basis of the exchanged setpoint and / or actual values and / or stored values and with the help of subordinate process models and determines the temperature of the predefined temperature deviations from a setpoint specification at this point new setpoint specifications of 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 target value specifications are determined with the aid of an optimization algorithm that includes at least one subordinate process model.

Das erfindungsgemäße Verfahren wird nachfolgend unter Bezugnahme auf die genannten Figuren in Form von Ausführungsbeispielen detailliert beschrieben. In allen Figuren sind gleiche technische Elemente mit gleichen Bezugszeichen bezeichnet. The method according to the invention is described in detail below in the form of exemplary embodiments with reference to the figures mentioned. In all figures, the same technical elements are denoted by the same reference symbols.

Der Beschreibung sind die folgenden drei Figuren beigefügt: Figur 1 : Anlagenschema Warmbandstraße The following three figures are attached to the description: Figure 1: System diagram for the hot strip mill

Figur 2: Regelungsschema mit übergeordnetem ProzessmodellFigure 2: Control scheme with a higher-level process model

Figur 3: Vergleich Temperaturverlauf Sollwert, Ist-Wert Figure 3: Comparison of temperature curve setpoint and actual value

Figur 1 zeigt ein mögliches Anlagenschema einer Warmbandstraße zur Fierstellung eines Warmbandes bei dem das erfindungsgemäße Verfahren angewendet wird. Die Warmbandstraße besteht aus einer Gießanlage 1, zwei Scheren 2, 10, zwei Öfen 3, 6, zwei Vorgerüsten 4, einer Transferbarkühlung 5, einer induktiven Fleizung 7, drei Fertiggerüsten 8, einer Kühlstrecke 9 und einer Flaspel 11 zum Aufwickeln des Warmbandes. Ein übergeordnetes Datenverarbeitungssystem 12 weist ein integriertes Temperatur- und Gefügemodell auf. Soll- und Istwerte werden mit den unterschiedlichen Anlagen bzw. zugeordneten Regelungen, Steuerungen und / oder Messeinrichtungen ausgetauscht und beispielsweise in Form einer Datenbank gespeichert. FIG. 1 shows a possible system scheme of a hot strip mill for the production of a hot strip in which the method according to the invention is used. The hot strip mill consists of a casting plant 1, two shears 2, 10, two furnaces 3, 6, two roughing stands 4, a transfer bar cooling 5, an inductive heating system 7, three finishing stands 8, a cooling section 9 and a flasher 11 for winding 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 are stored, for example, in the form of a database.

Figur 2 stellt ein Ablaufdiagramm mit einer beispielhaften Vernetzung von zwei Aggregaten bzw. Regelungen der zwei Aggregate mit den jeweiligen Prozessmodellen dar. Das übergeordnete Datenverarbeitungssystem I übergibt Sollwerte an das übergeordnete Prozessmodell II der Warmbandstraße. Aus diesen Sollwerten, beispielsweise eine Festigkeit, ermittelt das übergeordnete Prozessmodell II eine Anzahl von Sollwerten oder Sollwertbereichen, beispielsweise ein Temperaturverlauf mit jeweils min. und max. Temperaturen, die an die untergeordneten Prozessmodelle lila, b übergeben werden. Die untergeordneten Prozessmodelle III a, b leiten daraus spezifische Sollwerte für das jeweilige Aggregat ab. Beispielsweise wird aus einer vorgegebenen Temperaturkurve mit zugeordneten Zeitpunkten eine Sollvorgabe für eine Brennersteuerung in einem Ofen 3 oder eine Sollvorgabe für die Steuerung der Wassermenge in einer Kühlstrecke 9. Diese werden an die entsprechenden Regelungen der jeweiligen Aggregate weitergegeben. Falls die Werte innerhalb des Aggregates nicht erreicht werden, kann das untergeordnete Prozessmodell III a, b die Sollvorgabe anpassen. Ebenfalls kann hier auch eine automatische Optimierung des Prozessmodells III a, b mittels eines selbstlernenden Algorithmus erfolgen. Weicht die Ziel-Istgröße von den Zielwertvorgabe V des übergeordneten Prozessmodells II ab, wird auf der übergeordneten Ebene II die Sollwerte neu berechnet und ggf. angepasst. FIG. 2 shows a flow chart 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 setpoint values to the higher-level process model II of the hot strip mill. From these setpoint values, for example a strength, the superordinate process model II determines a number of setpoint values or setpoint ranges, for example a temperature profile with min. And max.temperature, which are transferred to the subordinate process models lila, b. The subordinate process models III a, b derive specific setpoint values for the respective unit from this. For example, a setpoint for a burner control in an oven 3 or a setpoint for controlling the amount of water in a cooling section 9 is derived from a predefined temperature curve with assigned times. These are passed on to the corresponding controls of the respective units. If the values are not achieved within the unit, the subordinate process model III a, b can adjust the target value. An automatic optimization of the process model III a, b can also take place here by means of a self-learning algorithm. If the target actual value deviates from the target value specification V of the superordinate process model II, the setpoint values are recalculated on the superordinate level II and, if necessary, adjusted.

Figur 3 zeigt ein Diagramm mit einem Solltemperaturverlauf B und einem gemessenen sowie vorausberechneten Temperaturverlauf A. Der Solltemperaturverlauf B beginnt mit dem Ende der Gießanlage 1 und beschreibt den Verlauf bis zur Haspel 11. Die Istwerte sind vom Ende der Gießanlage 1 bis zum Vorgerüst 4 aufgetragen. Dabei ist die gemessene Temperatur oberhalb der Solltemperatur. Das übergeordnete Prozessmodell II berechnet ab diesem Punkt die Temperaturen an den unterschiedlichen Stellen in der Warmbandstraße voraus. Auf Basis dieser Temperaturkurve können an unterschiedlichen Stellen unterschiedliche Sollwerte neu vorgegeben werden, um die Temperaurabweichung zu korrigieren. Dabei können unterschiedlicheFIG. 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 at the end of the casting plant 1 and describes the curve up to the reel 11. The actual values are plotted from the end of the casting plant 1 to the roughing stand 4. The measured temperature is above the target temperature. From this point on, the higher-level process model II calculates the temperatures at the various points in the hot strip mill in advance. On the basis of this temperature curve, different setpoints can be specified anew at different points in order to correct the temperature deviation. Different

Prozessmodelle, Werkstoff- bzw. Gefügemodelle und / oder Optimierungsalgorithmen verwendet werden, um die beste Anpassungsstrategie zu bestimmen. Process models, material or microstructure models and / or optimization algorithms can be used to determine the best adaptation strategy.

Tabelle 1: Bezugszeichen Table 1: Reference symbols

Claims

Patentansprüche: Patent claims: 1. Verfahren zum Steuern oder Regeln der Temperatur eines Stahlbandes mit den Legierungselementen in Gew-% 1. Method for controlling or regulating the temperature of a steel strip with the alloying elements in% by weight Min Max C 0 1 Min Max C 0 1 Mn 0 2,5 bei der Warmumformung von einem Vorprodukt mit einer Dicke zwischen dv ^ 1 mm und dv ^ 300 mm zu einem Warmband mit einer Warmbanddicke dwß ^ 25 mm und einer Warmbandbreite zwischen bwB ^ 900 mm und bwB ^ 2100 mm, einer Zielhaspeltemperatur TH ^ 30°C bis TH ^ 750°C in einer Warmbandstraße, insbesondere TH ^ 400°C bis TH ^ 750°C , aufweisend zumindest einen Ofen zur Erwärmung und / oder Temperaturhomogenisierung des Vorproduktes, mindestens ein Walzgerüst zum Warmwalzen des Vorproduktes, eine Kühlstrecke zur gezielten Abkühlung des Warmbandes nach dem Umformen sowie eine Haspel zum Aufwickeln des Warmbandes zu einem Coil, wobei das jeweilige einzelne Aggregat eine eigene Steuerung oder Regelung für die vorgegebenen Sollwerte aufweist, dadurch gekennzeichnet, dass Mn 0 2.5 in the hot forming of a preliminary product with a thickness between dv ^ 1 mm and dv ^ 300 mm to a hot strip with a hot strip thickness dw ß ^ 25 mm and a hot strip width between bw B ^ 900 mm and bw B ^ 2100 mm , a target reel temperature TH ^ 30 ° C to TH ^ 750 ° C in a hot strip mill, in particular TH ^ 400 ° C to TH ^ 750 ° C, having at least one furnace for heating and / or temperature homogenization of the preliminary product, at least one roll stand for hot rolling the Pre-product, a cooling section for targeted cooling of the hot strip after forming and a reel for winding the hot strip into a coil, the respective individual unit having its own control or regulation for the specified setpoints, characterized in that - auf einem der Warmbandstraße zugeordneten Datenverarbeitungssystem ein übergeordnetes Prozessmodell Soll- und / oder Ist-Werten, aufweisend Zeiten, Geschwindigkeiten, Temperatur, Abkühlraten und / oder Aufheizraten, mit zumindest zwei Steuerungen oder Regelungen der Aggregate online austauscht und / oder speichert; - on a data processing system assigned to the hot strip mill, exchanges and / or stores a higher-level process model setpoint and / or actual values, including times, speeds, temperature, cooling rates and / or heating rates, online with at least two controls or regulators of the units; - das übergeordnete Prozessmodell auf Basis der ausgetauschten Soll- und / oder Ist-Werte und / oder gespeicherten Werte und mit Hilfe von untergeordneten Prozessmodellen die Temperatur des Stahlbandes für zumindest einen Punkt vor dem Aufhaspeln des Warmbandes online vorausbestimmt; und - The superordinate process model based on the exchanged setpoint and / or actual values and / or stored values and, with the help of subordinate process models, the temperature of the Steel strip predetermined online for at least one point before the coiling of the hot strip; and - das übergeordnete Prozessmodell bei Abweichungen der vorausbestimmten Temperatur von einer Sollwertvorgabe an diesem Punkt neue Sollwertvorgaben der Aggregate ermittelt, sowie an die Steuerung oder Regelung des Aggregates übergibt, um die Sollwertvorgabe für die Temperatur des Stahlbandes einzuhalten; und - If the predetermined temperature deviates from a setpoint specification, the higher-level process model determines new setpoint specifications for the units at this point and transfers them to the control or regulation of the unit in order to maintain the setpoint specifications for the temperature of the steel strip; and - die Ermittlung der neuen Sollwertvorgaben mit Hilfe von einem zumindest ein untergeordnetes Prozessmodell einschließenden Optimierungsalgorithmus erfolgt. the determination of the new target value specifications takes place with the aid of an optimization algorithm that includes at least one subordinate process model. 2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass 2. The method according to claim 1, characterized in that - das Vorprodukt eine Bramme mit einer Dicke dß ^ 50 mm bis dß < 160 mm aus einer Gießmaschine ist; und - The intermediate product is a slab with a thickness d ß ^ 50 mm to d ß <160 mm from a casting machine; and - das übergeordnete Prozessmodell eine Gießgeschwindigkeit, vorzugsweise zwischen VG ^ 4 m/min und VG ^ 6 m/min, mehr bevorzugt VG ^ 5 m/min und VG ^ 6 m/min und eine Gießmaschinenauslauftemperatur, vorzugsweise TGE ^ 800°C, der Bramme bei der Bestimmung der Sollvorgaben berücksichtigt. the superordinate process model has 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 TGE ^ 800 ° C, the slab is taken into account when determining the target values. 3. Verfahren nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, dass das Optimierungsziel den Energieverbrauch, die Produktionsmenge, die Prozesssicherheit, Produkteigenschaften, Produktionskosten und / oder Anlagenverschleiß umfasst. 3. The method according to any one of the preceding claims, characterized in that the optimization target includes the energy consumption, the production volume, the process reliability, product properties, production costs and / or system wear. 4. Verfahren nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, dass ein untergeordnetes Prozessmodell die Gefügeentwicklung des Stahlbandes in der Warmbandstraße für zumindest einen Punkt, vorzugsweise vor dem Flaspeln des Warmbandes, bestimmt. 4. The method according to any one of the preceding claims, characterized in that 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 flipped. 5. Verfahren nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, dass bei der Warmumformung ein Vorgerüst und ein Fertiggerüst verwendet werden. 5. The method according to any one of the preceding claims, characterized in that a roughing stand and a finishing stand are used in the hot forming. 6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass für den Sollwert der Einlauftemperatur in das Fertiggerüst ein Temperatursollwert von TFS = 850°C bis TFS = 1050°C, vorzugsweise6. The method according to claim 5, characterized in that for the setpoint of the inlet temperature in the finishing stand, a temperature setpoint of TFS = 850 ° C to TFS = 1050 ° C, preferably TFS = 900°C bis TFS = 1000°C, noch mehr bevorzugt TFS = 900°C bis TFS = 950°C durch das übergeordnete Prozessmodell vorgegeben wird. TFS = 900 ° C to TFS = 1000 ° C, even more preferably TFS = 900 ° C to TFS = 950 ° C, is specified by the higher-level process model. 7. Verfahren nach einem der Ansprüche 5 bis 6, dadurch gekennzeichnet, dass für den Sollwert der Auslauftemperatur aus dem Fertiggerüst ein Temperatursollwert innerhalb von TFE ^ 750°C bis TFE ^ 950°C, vorzugsweise TFE ^ 750°C bis TFE ^ 900°C, noch mehr bevorzugt TFE ^ 800°C bis TFE ^ 850°C durch das übergeordnete7. The method according to any one of claims 5 to 6, characterized in that for the setpoint of the outlet temperature from the finishing stand, a temperature setpoint within TFE ^ 750 ° C to TFE ^ 950 ° C, preferably TFE ^ 750 ° C to TFE ^ 900 ° C, even more preferably TFE ^ 800 ° C to TFE ^ 850 ° C by the parent Prozessmodell vorgegeben wird. Process model is specified. 8. Verfahren nach einem der Ansprüche 5 bis 7, dadurch gekennzeichnet, dass für den Sollwert der Einlaufgeschwindigkeit in das Fertiggerüst ein Geschwindigkeitssollwert von VF ^ 0,4 m/s bis VF ^ 1 m/s durch das übergeordnete Prozessmodell vorgegeben wird. 8. The method according to any one of claims 5 to 7, characterized in that for the setpoint of the entry speed into the finishing stand, a speed setpoint of V F ^ 0.4 m / s to V F ^ 1 m / s is specified by the higher-level process model. 9. Verfahren nach einem der Ansprüche 5 bis 8, dadurch gekennzeichnet, dass für den Sollwert der Einlauftemperatur in das Vorgerüst ein Temperatursollwert von Tvs 000°C bis Tvs ^ 1150°C durch das übergeordnete Prozessmodell vorgegeben wird. 9. The method according to any one of claims 5 to 8, characterized in that a temperature setpoint of Tvs 000 ° C to Tvs ^ 1150 ° C is specified by the higher-level process model for the setpoint of the inlet temperature in the roughing stand. 10. Verfahren nach einem der Ansprüche 5 bis 9, dadurch gekennzeichnet, dass für den Sollwert der Auslauftemperatur aus dem Vorgerüst ein Temperatursollwert von TVE ^ 950°C bis TVE ^ 1 100°C, durch das übergeordnete Prozessmodell vorgegeben wird. 10. The method according to any one of claims 5 to 9, characterized in that for the setpoint of the outlet temperature from the roughing stand a temperature setpoint of TVE ^ 950 ° C to TVE ^ 1 100 ° C, is specified by the higher-level process model. 11. Verfahren nach einem der Ansprüche 5 bis 10, dadurch gekennzeichnet, dass für den Sollwert der Einlaufdicke in das Fertiggerüst ein Sollwert innerhalb von ÜFS ^ 20 mm bis ÜFS ^ 70 mm durch das übergeordnete Prozessmodell vorgegeben wird. 11. The method according to any one of claims 5 to 10, characterized in that for the target value of the inlet thickness in the finishing stand, a target value within Ü FS ^ 20 mm to Ü FS ^ 70 mm is specified by the higher-level process model. 12. Verfahren nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, dass für den Sollwert der Flaspeltemperatur ein Temperatursollwert von TH ^ 30°C bis TVE ^ 750°C, bevorzugt TH ^ 450°C bis TH ^ 550°C, durch das übergeordnete Prozessmodell vorgegeben wird. 12. The method according to any one of the preceding claims, characterized in that for the setpoint of the flask temperature, a temperature setpoint of TH ^ 30 ° C to TVE ^ 750 ° C, preferably TH ^ 450 ° C to TH ^ 550 ° C, by the higher-level process model is specified. 13. Verfahren nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, dass das Legierungselement C auf einen Gehalt von 0,03 Gew.-% bis 0,15 Gew.-% und / oder Mn auf einen Gehalt von 0,50 Gew.-% bis 2,00 Gew.-% im Stahlband beschränkt ist. 13. The method according to any one of the preceding claims, characterized in that the alloying element C is limited to a content of 0.03% by weight to 0.15% by weight and / or Mn to a content of 0.50% by weight to 2.00% by weight in the steel strip. 14. Verfahren nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, dass die optimierten Sollwertvorgaben für die Herstellung eines nachfolgenden Warmbandes mit gleichen Produktionszielen, insbesondere der mechanischen Eigenschaften, verwendet werden. 14. The method according to any one of the preceding claims, characterized in that the optimized target value specifications are used for the production of a subsequent hot strip with the same production goals, in particular the mechanical properties. 15. Vorrichtung für das Steuern oder Regeln der Temperatur eines Stahlbandes gemäß einem der Ansprüche 1 bis 14, dadurch gekennzeichnet, dass 15. Device for controlling or regulating the temperature of a steel strip according to one of claims 1 to 14, characterized in that - auf einem der Warmbandstraße zugeordneten Datenverarbeitungssystem, ein übergeordnetes Prozessmodell Soll- und / oder Ist-Werten, aufweisend Zeiten, Geschwindigkeiten, Temperatur, Abkühlraten und / oder Aufheizraten, mit zumindest zwei Steuerungen oder Regelungen der Aggregate online austausch- und / oder speicherbar ist; - on a data processing system assigned to the hot strip mill, a superordinate process model setpoint and / or actual values, having times, speeds, temperature, cooling rates and / or heating rates, can be exchanged and / or stored online with at least two controls or regulators of the units; - das übergeordnete Prozessmodell auf Basis der ausgetauschten Soll- und / oder Ist-Werten und / oder gespeicherten Werten und mit Hilfe von untergeordneten Prozessmodellen die Temperatur des Stahlbandes für zumindest einen Punkt vor dem Aufhaspeln des Warmbandes online vorausbestimmbar ist; und - The higher-level process model based on the exchanged setpoint and / or actual values and / or stored values and with the aid of subordinate process models, the temperature of the steel strip can be predicted online for at least one point before the hot strip is reeled; and - das übergeordnete Prozessmodell bei Abweichungen der vorausbestimmten Temperatur von einer Sollwertvorgabe an diesem Punkt neue Sollwertvorgaben der jeweiligen Aggregate ermittelt, sowie an die Steuerung oder Regelung des jeweiligen Aggregates übergibt, um die Sollwertvorgabe für die Temperatur des Stahlbandes einzuhalten; und - If the predetermined temperature deviates from a setpoint specification, the higher-level process model determines new setpoint specifications for the respective units at this point, and transfers them to the control or regulation of the respective unit in order to maintain the setpoint specification for the temperature of the steel strip; and - die Ermittlung der neuen Sollwertvorgaben mit Hilfe von einem zumindest ein untergeordnetes Prozessmodell einschließenden Optimierungsalgorithmus erfolgt. the determination of the new target value specifications takes place with the aid of an optimization algorithm that includes at least one subordinate process model.
EP21716283.3A 2020-05-05 2021-03-25 Method for the open-loop or closed-loop control of the temperature of a steel strip during hot working in a hot strip mill Active EP4146414B1 (en)

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US12492442B2 (en) 2025-12-09
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