EP4594028A1 - Verfahren zum betrieb einer warmbandproduktionsanlage computerprogrammprodukt und warmbandproduktionsanlage zur herstellung eines warmbandes - Google Patents
Verfahren zum betrieb einer warmbandproduktionsanlage computerprogrammprodukt und warmbandproduktionsanlage zur herstellung eines warmbandesInfo
- Publication number
- EP4594028A1 EP4594028A1 EP24829483.7A EP24829483A EP4594028A1 EP 4594028 A1 EP4594028 A1 EP 4594028A1 EP 24829483 A EP24829483 A EP 24829483A EP 4594028 A1 EP4594028 A1 EP 4594028A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hot
- hot strip
- strip
- temperature
- equal
- 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
Links
Classifications
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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
- B21B37/76—Cooling control on the run-out table
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/42—Induction heating
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
- C21D1/667—Quenching devices for spray quenching
-
- 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
- C21D11/00—Process control or regulation for heat treatments
-
- 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
- C21D11/00—Process control or regulation for heat treatments
- C21D11/005—Process control or regulation for heat treatments for cooling
-
- 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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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
- 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
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/573—Continuous furnaces for strip or wire with cooling
-
- 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
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/60—Continuous furnaces for strip or wire with induction heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/225—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by hot-rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0057—Coiling the rolled product
-
- 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
- B21B2261/21—Temperature profile
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
-
- 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
Definitions
- Hot strip production plants known in the prior art heat a metallic hot-rolled stock, in particular a slab, using a gas-fired furnace, in particular a walking beam furnace. After hot rolling into a hot strip, the hot strip is cooled using a cooling device, in particular a laminar cooling device, and wound into a coil.
- a cooling device in particular a laminar cooling device
- the objective of known hot strip production plants is to produce a hot strip which, before being wound into a coil, has a temperature that is as constant as possible in the length direction, in the width direction and in the thickness direction.
- this objective can only be achieved to a limited extent because, among other things, when heating the metallic hot-rolled stock in the furnace, local temperature inhomogeneity can occur due to the contact surfaces of the slabs within the furnace.
- the reason for the above-described objective of achieving the most constant temperature possible for the hot strip before winding is that this also aims to achieve the most homogeneous material properties of the hot strip before winding.
- hot-rolled strip is further processed in a downstream strip treatment plant into cold-rolled strip and/or coated strip, wherein the strip undergoes heat treatment, particularly depending on the respective metal composition.
- a treatment plant can be a continuous galvanizing line (CGL).
- the invention is based on the object of providing an improvement or an alternative to the prior art.
- the object is achieved by a method for operating a hot strip production plant for producing a hot strip, wherein the hot strip production plant has a hot rolling device for hot rolling the hot strip from the metallic hot rolling stock; a reel for winding the hot strip onto a coil; and at least one dynamic temperature control element; wherein the method has the following method steps:
- the hot strip production plant may comprise a heating device for heating and/or homogenizing the metallic hot rolled stock, wherein the method may comprise the preferred method step:
- Heating and/or homogenizing the metallic hot-rolled stock with the heating device Heating and/or homogenizing the metallic hot-rolled stock with the heating device.
- the material properties of a metallic product depend not only on the material composition but also on the microstructure of the metal, particularly if the metal contains an iron and a carbon content and can therefore also be referred to as steel.
- the course of the phase transformation of steel influences the microstructure of steel, in particular the ferrite content and/or the pearlite content and/or the bainite content and/or the martensite content and/or the austenite content of the steel microstructure.
- the microstructure of steel influences the properties of steel.
- a locally deviating cooling curve of steel leads to correspondingly locally different material properties.
- a low pearlite content can be achieved by rapid cooling and leads to a lower hardness and/or a better formability.
- Cooling leads to greater hardness.
- the hot-rolled strip is generally coiled at a temperature at which the structural transformation of the metal is not yet complete.
- the temperature at which the hot-rolled strip is typically coiled is between 300°C and 750°C.
- the above temperature range is merely an example and is intended to clarify the usual temperature range.
- the exact temperature at which the hot-rolled strip is coiled depends on the alloy and/or the quality of the hot-rolled strip.
- Temporing is understood to mean the adjustment of the temperature of the metallic hot-rolled stock and/or the hot strip by means of at least one dynamic temperature control element, in particular the adjustment of the temperature of the metallic hot-rolled stock and/or the hot strip in the longitudinal direction of the metallic hot-rolled stock and/or the hot strip, in particular the adjustment of the temperature of the metallic hot-rolled stock and/or the hot strip as a function of a coordinate in the longitudinal direction of the metallic stock.
- the metallic hot-rolled stock and/or the hot strip can be tempered in such a way that a temperature varying in the longitudinal direction of the metallic hot-rolled stock and/or the hot strip is set in the metallic hot-rolled stock and/or the hot strip. In this way, a different temperature that is variable over the length of the metallic hot-rolled stock and/or the hot strip can be set.
- a “dynamic temperature control element” is understood to mean a device which is designed to generate a varying temperature profile which corresponds to a varying temperature profile of the hot strip in front of the coiler per 1 m length of the hot strip and per 1 mm thickness of the hot strip of greater or equal to 0.1 K/(m*mm) (Kelvin per 1 m length of the hot strip and per 1 mm thickness of the hot strip), preferably greater than or equal to 0.2 K/(m*mm) or greater than or equal to 0.4 K/(m*mm) and particularly preferably greater than or equal to 0.8 K/(m*mm).
- the dynamic temperature control element can achieve the above values for the varying temperature profile by heating and/or cooling.
- Tempering makes it possible to set different and/or variable temperatures over the length of the metallic hot-rolled stock and/or the hot strip.
- tempering can take place before hot rolling, i.e., in conjunction with a metallic hot-rolled stock, and/or between two rolling stands and/or after hot rolling, i.e., in conjunction with a hot strip. Since the result of tempering is always retained in the hot-rolled hot strip, tempering of a hot strip in the context of this application can be understood as tempering before hot rolling, during hot rolling, and/or after hot rolling.
- Tempering can be understood as a partial or complete cooling of the metallic hot-rolled stock and/or the hot strip and/or a partial maintenance of the temperature of the metallic hot-rolled stock and/or the hot strip and/or a partial or complete heating of the metallic hot-rolled stock and/or the hot strip.
- a "varying temperature profile” is understood to mean a temperature profile which cannot be achieved by aiming for the most homogeneous temperature profile possible, as this would result in inhomogeneity in the material properties.
- a planned varying temperature profile has a continuous connection between at least one maximum value and one minimum value for a designated temperature and/or a high point and a low point for a designated temperature of the hot strip before coiling.
- the precipitation behavior and/or the grain growth and/or different phase proportions of the hot strip can be changed locally in such a way that this targeted change, together with another unavoidable or deliberately induced local change in the precipitation behavior and/or the grain growth and/or the phase proportions as a result of inhomogeneous temperature control, can lead to overall homogeneous material properties up to the cooled hot strip or up to the cooled further processed strip, in particular cold strip, or up to the finished product.
- material properties can be understood as one, two, three, four or more than four of the following parameters: yield strength, tensile strength, elongation at break, r value, n value, brittle fracture transition temperature, phase fractions (austenite, ferrite, pearlite, bainite, martensite), electrical properties and/or core losses or the like.
- yield strength tensile strength
- elongation at break r value
- n value brittle fracture transition temperature
- phase fractions austenite, ferrite, pearlite, bainite, martensite
- electrical properties and/or core losses or the like can be understood as one, two, three, four or more than four of the following parameters: yield strength, tensile strength, elongation at break, r value, n value, brittle fracture transition temperature, phase fractions (austenite, ferrite, pearlite, bainite, martensite), electrical properties and/or core losses or the like.
- a “heating device” is understood to mean a device which is designed to heat and/or homogenise and/or anneal and/or maintain the temperature of a metallic hot-rolled stock.
- a heating device can be designed to condition and/or prepare a metallic hot-rolled stock for processing by means of a hot-rolling device. In this way, the temperature in a metallic hot-rolled stock can be adjusted for hot rolling by means of a heating device.
- a heating device can thus be understood as a link between an upstream process step and a hot-rolling device.
- a heating device can be designed as an inductor. Furthermore, a heating device can also be gas-fired, in particular using hydrogen and/or a fossil fuel.
- a metallic hot-rolled stock can be heated by a heating device starting at a low temperature or room temperature to a hot-rolling temperature.
- a metallic hot-rolled product can be transferred directly with first heat from a casting device for metallic hot-rolled products into a heating device and heated there to a hot-rolling temperature.
- a metallic hot-rolled product can be annealed by a heating device at a constant temperature.
- a temperature distribution in a metallic rolling stock can be homogenized using a heating device.
- a temperature distribution in a metallic hot-rolled stock can be equalized within a heating device.
- heating devices can also be used to heat the metallic hot-rolled stock without departing from the present aspect of the invention.
- the process proposed here can be carried out on a Steckei mill. Therefore, the term "hot strip production plant” can also be understood to mean a Steckei mill.
- a varying temperature profile is preferably provided, the maximum temperature of which in the longitudinal direction of the hot strip is at least 1% higher than the minimum temperature of the temperature profile in the longitudinal direction of the hot strip. Furthermore, the maximum temperature is preferably greater than or equal to 2% higher than the minimum temperature, preferably greater than or equal to 3% and particularly preferably greater than or equal to 5%. Preferably, the maximum temperature is greater than or equal to 4% higher than the minimum temperature, preferably greater than or equal to 6% and particularly preferably greater than or equal to 7%.
- the maximum temperature is less than or equal to 11% higher than the minimum temperature, preferably less than or equal to 9% and particularly preferably less than or equal to 7%.
- a temperature profile can be provided whose maximum temperature is greater than or equal to 5 ° C higher than the minimum temperature, preferably greater than or equal to 10 ° C and particularly preferably greater than or equal to 25 ° C.
- the maximum temperature is greater than or equal to 15 ° C higher than the minimum temperature, preferably greater than or equal to 20 ° C and particularly preferably greater than or equal to 30 ° C.
- the maximum temperature is less than or equal to 45 ° C higher than the minimum temperature, preferably less than or equal to 40 ° C and particularly preferably less than or equal to 35 ° C .
- a dynamic temperature actuator is required, wherein a higher temperature dynamic can be achieved with the dynamic temperature actuator than with a heating device of the hot strip production plant, in particular with a gas-fired heating device of the hot strip production plant. It is understood that a plurality of dynamic temperature actuators can also be used to achieve the object, in particular a cooling device and an inductive heating device.
- a control system can comprise a continuous linear controller, in particular a PD controller or a PID controller.
- a dynamic temperature controller can have a cooling device, in particular a laminar cooling device and/or a transfer bar cooling system (also TBC for transfer bar cooling) and/or a compact cooling system having coolant nozzles for allowing a coolant to escape and/or an inter-stand cooling system.
- a cooling device can be arranged between the hot rolling device and the coiler. Cooling devices are known to have a cooling rate of 50 K/s, so that the hot strip can be cooled by means of such a cooling device from a thickness-average temperature of 1,150 K to a thickness-average temperature of 650 K in a cooling time of 10 s.
- This cooling rate or in other words the rate at which the temperature profile in the hot strip can be changed, is particularly fast compared to a gas-fired heating device and can - as has been shown - sufficiently influence the precipitation behavior and/or grain growth and/or different phase proportions corresponding to the overall objective.
- a control or regulation system can be coupled to a cooling device and the cooling device can be adjusted accordingly with the objective of the varying temperature profile proposed here.
- a dynamic temperature control element may comprise a heating device, in particular an inductive heating device.
- An inductive heating device may preferably be arranged upstream of the coiler.
- Such a heating device can have a nominal power density in
- a heating device can be arranged in function as a component of a dynamic temperature control element between the hot rolling device and the coiler, in particular before or after a cooling device.
- a heating device functioning as a component of a dynamic temperature control element can preferably be arranged between the heating device and an outlet end of the hot rolling device, in particular in front of one of the rolling stands of the hot rolling device.
- a heating device functioning as a component of a dynamic temperature control element can be arranged between two rolling stands of the hot rolling device.
- a dynamic temperature control element cannot be understood as a reel heating device which is designed to temper a coil, such as a reel heating device known from a Steckei Mill.
- An “outlet end” is understood to be the side of a hot rolling device at which the hot strip is designated to run out of the hot rolling device. In other words, this means the end of the hot rolling device which, with regard to a designated material flow of the hot strip on the
- the tempering of the metallic hot-rolled stock and/or the hot-rolled strip takes place over a length of greater than or equal to 95% of the metallic hot-rolled stock and/or the hot-rolled strip, preferably over a length of greater than or equal to 97.5% or over a length of greater than or equal to 99% and particularly preferably over the entire length.
- Particularly homogeneous material properties for the finished product and/or for the cooled, further processed strip, in particular cold-rolled strip, and/or for the cooled hot-rolled strip can be achieved if the varying temperature profile has a continuous profile, in particular a continuous profile over a length of greater than or equal to 50% of the metallic hot-rolled stock and/or the hot-rolled strip, preferably over a length of greater than or equal to 95% or over a length of greater than or equal to 98% and particularly preferably over the entire length of the metallic hot-rolled stock and/or the hot-rolled strip.
- continuous progression means a continuous progression in the mathematical sense.
- the tempering of the metallic hot-rolled stock and/or the hot-rolled strip is carried out by means of the dynamic temperature control element over a length of greater than or equal to 95% of the metallic hot-rolled stock and/or the hot- strip, preferably over a length of greater than or equal to 97.5% or over a length of greater than or equal to 99% and particularly preferably over the entire length of the metallic hot-rolled stock and/or the hot strip.
- the varying temperature profile has, at least in some regions, a temperature difference per 1 m length of the hot strip and per 1 mm thickness of the hot strip of greater than or equal to 0.1 K/(m * mm) (Kelvin per 1 m length of the hot strip and per 1 mm thickness of the hot strip), preferably of greater than or equal to 0.2 K/(m * mm) or of greater than or equal to 0.4 K/(m * mm) and particularly preferably of greater than or equal to 0.8 K/(m * mm).
- the above values correspond to a varying temperature profile of the hot strip in front of the coiler, regardless of the arrangement of the dynamic temperature control element within the hot strip production plant.
- a maximum temperature at one end of the hot strip and a minimum temperature in a middle area of the hot strip can be provided for the varying temperature profile.
- End of the hot strip a maximum temperature and a minimum temperature temperature in a middle area of the hot strip.
- a minimum temperature and a maximum temperature in a central region of the hot strip can be provided at each end of the hot strip.
- the varying, continuous temperature profile can have a bathtub function, the profile of which is designed analogously to a wall profile of a bathtub in cross section, with the maximum temperatures being found at the respective end of the profile and the minimum temperature in the middle area.
- the middle area is arranged between the ends of the hot strip in the longitudinal direction of the hot strip.
- At least two or at least three high points away from the ends of the hot strip are optionally provided for the varying temperature profile.
- the contact surfaces of the metallic hot-rolled stock may locally lower the temperature of the metallic hot-rolled stock and, after hot rolling, also of the hot strip. This can lead to locally inhomogeneous precipitation behavior and/or grain growth and/or phase fractions, an associated locally deviating microstructure, and thus also to different material properties throughout the entire temperature control process until the hot strip is coiled or until the hot strip has completely cooled to ambient temperature.
- Some strip processing plants operate continuously, with a plurality of wound hot strips being joined together at the input side and continuously processed by the strip processing plant.
- a varying temperature profile is proposed here, which provides a maximum temperature and a minimum temperature at opposite ends of the hot strip.
- this makes it possible to trim the precipitation in the hot strip and/or the grain growth and/or the formation of different phase fractions in such a way that, when the hot strip is further processed in a strip processing plant at successive different annealing temperatures of successively treated material grades, a strip with largely homogeneous material properties can be produced.
- data in particular data of at least one material property, of a hot strip already produced can be used to control and/or regulate the dynamic temperature control element for a hot strip still to be produced. optimize.
- the measured data obtained in this way can be compared with the desired target data. If differences are identified, a change to a control and/or regulation specification can be derived, in particular in such a way that an existing deviation in at least one mechanical property is reduced to a minimum or avoided.
- the dynamic temperature actuator is controlled or regulated using a process model, in particular using a non-linear process model.
- the dynamic temperature actuator can be controlled using a model-based controller, in particular using a model-based controller based on a non-linear process model.
- Precise and reliable control or regulation can be advantageous in improving the dynamic behavior of thermal processes.
- mechanisms influencing the precipitation behavior and/or dynamic grain growth and/or the dynamic formation of different phase fractions can be used to construct a process model, which can be used as a substitute system within the framework of control or regulation.
- Such a process model can contain linear or non-linear model components and be supported by data, in particular by measurement data.
- a process model can be modeled continuously in time using differential equations to reproduce the dynamics. Regardless of whether the process model is used for open-loop or closed-loop control, it can represent the precipitation process considered here and/or the grain size formation process and/or the formation process of different phase fractions with greater accuracy than is possible with linear control or using a continuous linear controller, in particular a P controller, a PD controller or a PID controller.
- the process model when directly compared to a continuous linear controller, can enable cross-coupling of various variables as well as explicit compliance with process-related boundary conditions, since continuous linear controllers are determined solely by a conservative choice of setting parameters that is suitable in the optimal case.
- the use of a process model allows the control or regulation of the tempering of the metallic rolling stock and/or the hot strip in the direction of an advantageous varying temperature profile.
- a process model in the context of controlling the temperature of the metallic rolling stock and/or the hot strip also allows for model-predictive control, as the process model can also be used as a prediction model. In this way, with appropriate modeling of the precipitation behavior and/or grain growth and/or the dynamic formation of different phase fractions, it is possible to control the varying temperature profile such that the cooled hot strip exhibits homogeneous material properties.
- the process model can also include the further treatment of the hot strip in a downstream strip processing plant, so that the model-predictive control of the varying temperature profile is possible in such a way that the hot strip further processed into a strip in a strip processing plant has the desired, most homogeneous material properties. properties after it has completely cooled down to ambient temperature.
- the process model can also include logistical relationships between the hot strip and the strip processing plant as well as the process planning of the strip processing plant.
- homogeneous material properties can also be achieved if the process model includes a physical and/or chemical model, in particular a metallurgical model.
- data from a database can be used to control or regulate the dynamic temperature actuator, in particular data comprising metallurgical information and/or process planning information.
- the link to a database can also simplify the control or regulation of the dynamic temperature actuator, so that, among other things, a behavior dependent on the composition of the metal can be taken into account using data from a database and/or an improvement in the homogeneity of the target material properties can be achieved.
- a semi-empirical process model can be considered, which can use data from a database as well as a model on a physical and/or chemical basis, in particular on a metallurgical basis.
- Data can refer to data from the current process, a previous process and/or a downstream processing process.
- values of at least one measured variable can be used to control or regulate the dynamic temperature control element, in particular a temperature measured variable, a metallurgical measured variable, a microstructure component variable, a material property variable, a metal structure variable, a process variable and/or a geometric variable, in particular a casting thickness.
- a process variable can be understood as, among other things, the casting speed and/or an operating condition of the hot strip production plant and/or a strip treatment plant.
- the use of a measured value allows, among other things, an adjustment of the varying temperature profile for the next hot strip to be produced depending on an actual value of a previously produced hot strip.
- measured variables allows the consideration of cross-coupling between measured variables within the process model.
- Consideration of measured variables within a process model can also be used to improve the modeling of the process model, especially when using a self-learning process model, especially when using a neural network.
- a particularly advantageous empirical or semi-empirical process model can be achieved if the process model is a self-learning one, in particular using machine learning, which allows the mapping quality and model depth of the process model to be continuously developed in a comparatively simple way.
- setpoints can also be used to control or regulate the dynamic temperature actuator, in particular for a thickness reduction of the hot strip in a rolling stand, a final rolling temperature, a coiler temperature, a cooling strategy, an intermediate strip thickness, a cold forming degree, an annealing temperature and/or a cooling stop temperature after annealing.
- a determination of material values in the laboratory can also be regarded as a measured value of a measurand, provided that this is fed into the database and/or otherwise returned to the process model.
- the hot-rolled strip can be divided in the longitudinal direction into at least three segments, preferably at least five segments, and particularly preferably at least seven segments, wherein target values for the material properties can be specified at least implicitly for each segment.
- Each segment can have different target values.
- a continuous or a continuous and differentiable modeling for a target value can take place.
- a loss of hot strip in the form of scrap at the head end and/or foot end can be taken into account.
- the material quality in the longitudinal direction of the hot strip does not leave a defined tolerance range, whereby the hot strip is finally released after examination of a material sample.
- this traditional process would lead to an undesirable devaluation of the hot strip.
- a measuring technology e.g. Impulse Magnetic Process Online Controller (IMPOC)
- IMPOC Impulse Magnetic Process Online Controller
- a computer program product comprising program code means suitable for carrying out the steps of a method according to the first aspect of the invention when the computer program product is executed on a computing device.
- a hot strip production plant for producing a hot strip, comprising: a hot rolling device for hot rolling the hot strip from a metallic hot-rolled stock; at least one dynamic temperature actuator; a reel for winding the hot strip onto a coil; and a control device which is data-coupled to the dynamic temperature actuator for transmitting control signals; wherein the control device is designed to carry out a method according to the first aspect of the invention.
- the invention can extend directly to a hot strip production plant for producing a hot strip comprising a control device suitable for carrying out a method according to the first aspect of the invention.
- the hot strip production plant comprises a heating device for heating and/or homogenizing the metallic hot rolled stock.
- the hot strip production plant has a measuring device for recording a measured variable, wherein the measuring device is data-coupled to the control device, in particular an IMPOC (Impulse Magnetic Process Online Controller).
- IMPOC Impulse Magnetic Process Online Controller
- Figure 1 schematically shows temperature profiles (a), (c) and a corresponding material property (b), (d) for a hot strip according to a first embodiment
- Figure 2 schematically shows temperature profiles (a), (c) and a corresponding material property (b), (d) for a hot-rolled strip according to a second embodiment
- Figure 3 schematic temperature curves (a), (c) and a corresponding material property (b), (d) for a hot strip according to a third embodiment.
- a hot strip 10 (not explicitly shown) has a longitudinal extension 12, a longitudinal extension direction 14 and two ends 16 each.
- Figs. 1 to 3 each show, in a schematic illustration, two temperature profiles 30, 31, 33 in the figure sections (a) and (c) as well as the figure sections (b) and (d) in a schematic illustration a material property 50, 55 corresponding to the respective temperature profile 30, 31, 33, in particular a tensile strength of the hot strip 10.
- a hot strip production plant has the objective of maintaining a temperature 30 that is as constant as possible over the longitudinal extent 12 of the hot strip 10.
- the hot strip 10 After coiling, however, the hot strip 10 cools at different speeds along its longitudinal extension 12. While the outer and inner coils cool comparatively quickly, the heat accumulates inside the coil, so that cooling inside the bundle progresses more slowly.
- the varying temperature profile 33 has the shape of a bathtub function, with a minimum temperature 40 being found in a central region and a maximum temperature 42 at the ends 16 of the hot strip 10.
- the second embodiment according to Fig. 2 shows an inhomogeneity of a material property 55 as a result of a temperature profile 31 when a metallic hot-rolled stock, which is later hot-rolled to form a hot strip 10, runs out of the heating device. Since this temperature distribution 31 only stretches in length during hot rolling, In the figure section ( a ) the temperature profile 31 has already been transferred to a hot strip 10 .
- the temperature distribution 31 has three low points which correspond to the beams of a walking beam heating device, by means of which the metallic hot-rolled stock in the heating device has not been heated homogeneously.
- the varying temperature profile 33 has three high points 44 corresponding to the low points of the temperature profile 31.
- the third embodiment according to Fig. 3 shows an inhomogeneity of a material property 55 after the strip 20 leaves a continuous strip processing plant. During the production of the hot strip 10, this was produced according to the temperature profile 30 in the hot strip production plant before coiling.
- the temperature control of the heating device of the strip treatment plant leads in the present case to the course 55 of the material property after the strip 20 has left the strip treatment plant, since the heating device of the treatment plant at one end of the strip is used to adjust to a different temperature required for a quality of an adjacent strip.
- the dynamics of this temperature change in the continuously operated strip processing plant can be seen in the course of material property 55.
- the varying temperature profile 33 has a minimum temperature 40 at one end 16 of the hot strip 10 and a maximum temperature 42 at the opposite end 16 of the hot strip 10, wherein the temperature profile in the central region of the hot strip 10 corresponds to the dynamics of the heating device of the downstream continuous strip processing plant.
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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)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Control Of Heat Treatment Processes (AREA)
- Metal Rolling (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102023135965.7A DE102023135965A1 (de) | 2023-12-20 | 2023-12-20 | Verfahren zum Betrieb einer Warmbandproduktionsanlage und Warmbandproduktionsanlage zur Herstellung eines Warmbandes |
| PCT/EP2024/086726 WO2025132310A1 (de) | 2023-12-20 | 2024-12-17 | Verfahren zum betrieb einer warmbandproduktionsanlage computerprogrammprodukt und warmbandproduktionsanlage zur herstellung eines warmbandes |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP4594028A1 true EP4594028A1 (de) | 2025-08-06 |
| EP4594028C0 EP4594028C0 (de) | 2025-12-10 |
| EP4594028B1 EP4594028B1 (de) | 2025-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| EP24829483.7A Active EP4594028B1 (de) | 2023-12-20 | 2024-12-17 | Verfahren zum betrieb einer warmbandproduktionsanlage computerprogrammprodukt und warmbandproduktionsanlage zur herstellung eines warmbandes |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4594028B1 (de) |
| DE (1) | DE102023135965A1 (de) |
| WO (1) | WO2025132310A1 (de) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2507641A1 (de) * | 1975-02-21 | 1976-09-02 | Sp K Bjuro Uraltschermetwtomat | Regelverfahren zur temperaturkonstanthaltung beim kuehlen warmgewalzten bandes vor dessen aufspulen und vorrichtung zur durchfuehrung des verfahrens |
| DE19632448A1 (de) * | 1996-08-05 | 1998-02-12 | Mannesmann Ag | Verfahren und Anlage zur Herstellung von Band aus niedriggekohlten und ultraniedriggekohlten Stählen |
| DE10327383C5 (de) * | 2003-06-18 | 2013-10-17 | Aceria Compacta De Bizkaia S.A. | Anlage zur Herstellung von Warmband mit Dualphasengefüge |
| 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 |
| DE102020214643A1 (de) * | 2020-11-20 | 2022-05-25 | Sms Group Gmbh | Verfahren zur Einstellung der Eigenschaften eines Warmbandes mit einer bestimmten chemischen Zusammensetzung in einer Warmwalzstraße |
| DE102021212902A1 (de) * | 2021-11-17 | 2023-05-17 | Sms Group Gmbh | Verfahren zum Herstellen eines Warmbandes aus einem Feinkornstahlwerkstoff |
-
2023
- 2023-12-20 DE DE102023135965.7A patent/DE102023135965A1/de active Pending
-
2024
- 2024-12-17 EP EP24829483.7A patent/EP4594028B1/de active Active
- 2024-12-17 WO PCT/EP2024/086726 patent/WO2025132310A1/de active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2025132310A1 (de) | 2025-06-26 |
| EP4594028C0 (de) | 2025-12-10 |
| EP4594028B1 (de) | 2025-12-10 |
| DE102023135965A1 (de) | 2025-06-26 |
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