WO2023088703A1 - Dispositif et procédé de production d'une bande métallique laminée - Google Patents

Dispositif et procédé de production d'une bande métallique laminée Download PDF

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Publication number
WO2023088703A1
WO2023088703A1 PCT/EP2022/080914 EP2022080914W WO2023088703A1 WO 2023088703 A1 WO2023088703 A1 WO 2023088703A1 EP 2022080914 W EP2022080914 W EP 2022080914W WO 2023088703 A1 WO2023088703 A1 WO 2023088703A1
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WO
WIPO (PCT)
Prior art keywords
measuring
metal strip
measuring point
flatness
cooling
Prior art date
Application number
PCT/EP2022/080914
Other languages
German (de)
English (en)
Inventor
Ingo Schuster
Stephan Schulze
Uwe Köppel
Kirill TOMAKOV
Original Assignee
Sms Group Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sms Group Gmbh filed Critical Sms Group Gmbh
Publication of WO2023088703A1 publication Critical patent/WO2023088703A1/fr

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Classifications

    • 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
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • B21B37/44—Control of flatness or profile during rolling of strip, sheets or plates using heating, lubricating or water-spray cooling of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2263/00—Shape of product
    • B21B2263/04—Flatness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/006—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/02—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring flatness or profile of strips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B39/02—Feeding or supporting work; Braking or tensioning arrangements, e.g. threading arrangements
    • B21B39/08—Braking or tensioning arrangements
    • B21B39/082—Bridle devices

Definitions

  • the invention relates to a device and a method for producing a rolled metal strip, preferably a hot-rolled metal strip.
  • a general optimization goal for rolling a metal strip in a rolling mill, especially in a hot strip mill, is to maximize the flatness of the metal strip in order to ensure trouble-free further processing and the desired product quality.
  • the cooling of the rolled products following a hot rolling train can be influenced in a targeted manner, whereby for example the tendency for the metal strip to edge up and/or buckle can be influenced. If the metal strip is bent or arched too much, it may not be possible to correct this in a subsequent roller table or a straightening machine in order to ensure quality. The consequences are tape errors and an associated increased reject rate.
  • An object of the invention is to provide an improved device and an improved method for producing a rolled metal strip, in particular to improve the product quality and/or productivity.
  • the device according to the invention is used to produce rolled, in particular hot-rolled, metal strips, with all (hot) rolled flat products, including intermediate products such as slabs, heavy plate, finished plate and the like, collectively falling under the term “metal strip”.
  • Products made of a metal, in particular a metal alloy, preferably steel, are processed.
  • the device comprises a rolling train that is set up to deform the metal strip plastically by rolling during transport along a conveying direction.
  • the device is preferably part of a hot strip mill.
  • the rolling train preferably functions as a roughing train that is set up to roll a rolling stock, for example a slab coming from a continuous casting plant, into a heavy plate.
  • the rolling train can comprise one or more roll stands in the usual way, each of which is preferably designed as a four-roll stand (four-high roll stand), each comprising two parallel, opposite work rolls which form a roll gap, and two associated back-up rolls which are correspondingly connected to the Work rolls are in contact to support the work rolls.
  • the apparatus further comprises a cooling device with a variable cooling capacity, which is arranged downstream (i.e. downstream) of the rolling train and is arranged to cool the metal strip.
  • the cooling capacity of the cooling device is variable; the cooling capacity can preferably be regulated in sections along the cooling section defined by the cooling device.
  • the cooling device has one or more nozzle arrangements, each with a plurality of nozzles.
  • the nozzle arrangements define a continuous cooling section in which the metal strip is specifically cooled by applying a cooling medium, preferably water or a water mixture.
  • the nozzles are preferably set up to spray the cooling medium onto the metal strip, in particular the two strip surfaces.
  • the nozzles are suitably positioned and aligned in order to apply a variable amount of cooling medium to the metal strip.
  • the cooling characteristics can be influenced by adjusting the height of the nozzle arrangement(s) or by other technical means for manipulating the amount of coolant and/or coolant distribution.
  • the device also has a straightening machine which is arranged behind (ie downstream) the cooling device in the conveying direction and is set up to straighten the metal strip, ie to bend it into a desired shape, preferably to straighten it to improve flatness.
  • the straightening machine is preferably used to eliminate topological distortions, internal stresses or deformations in the metal strip, which can result from rolling processes, thermal and/or other loads, for example.
  • the metal strip runs through the straightening machine in the conveying direction, in which the material is preferably guided through a group of upper and lower straightening rollers and is plastically deformed by adjusting the straightening rollers accordingly.
  • the device also includes a first measuring point, arranged between the rolling train and the cooling device, with a flatness measuring device for measuring topological properties of the metal strip.
  • the topological properties in particular the profile or the flatness of the metal strip, are preferably measured without contact.
  • the device also includes a second measuring point, arranged between the cooling device and the straightening machine, with a further flatness measuring device for measuring topological properties of the metal strip.
  • the topological properties in particular the profile or the flatness of the metal strip, are also measured at the second measuring point, preferably without contact.
  • the device also includes a controller that is in communication with the rolling train, the cooling device, the straightening machine and with the first and second measuring point and is set up to receive topological information from the first and second measuring point and the rolling train and/or the cooling device and/or to control the straightening machine depending on the topological information received from the first and second measuring point.
  • information here includes both analog or digital data that has already been pre-processed by the measuring points and represents a measured variable, as well as pure measurement signals, the evaluation of which is carried out completely or partially in the controller.
  • the controller is in communication with the corresponding components of the device to be controlled and with the measuring points, i.e. corresponding probes/sensors. Communication can be wireless or wired, digital or analog. Furthermore, a data or signal exchange in only one direction is subsumed herein under the term "communication".
  • the control does not necessarily have to be implemented by a central computing device, but decentralized and/or multi-level and hierarchical systems, control networks, cloud systems and the like are included.
  • the controller can also be an integral part of a higher-level system controller or communicate with one.
  • the device allows verification of any deviations from the desired topology of the metal strip, in particular the flatness, and automatic correction in an in-line cooling and straightening process.
  • a manual flatness assessment by an operator can be omitted. This relieves the operating personnel and standardizes the process, which means that less expertise is required on site to use and operate the device.
  • the automation of the cooling and straightening process presented here contributes to an improvement in the quality of the rolling stock, in particular with regard to flatness.
  • the improvement of the flatness of the metal strip in the cooling process has an improvement in the homogeneity of the material properties throughout rolled plate result. Overall, the device enables a significant increase in the degree of automation.
  • the controller preferably implements a control circuit for controlling the rolling train and/or the cooling device and/or the straightening machine, the control circuit using the topological information received from the first and/or second measuring point as a reference variable.
  • a control circuit for controlling the rolling train and/or the cooling device and/or the straightening machine, the control circuit using the topological information received from the first and/or second measuring point as a reference variable.
  • Such an integral measurement and control structure allows the use of machine learning methods in the manufacturing process by processing the measured flatness values.
  • optimal adjustment values for the leveler can be derived automatically and straightening passes can be saved, which is important for the production of steel sheets from certain materials (e.g. TRIP steels or other steels with retained austenite) in order to stimulate the hardening process as little as possible after cooling in the cooling section .
  • the first measuring point preferably has a temperature measuring device for measuring a surface temperature of the metal strip and/or the second measuring point has a temperature measuring device for measuring a surface temperature of the metal strip.
  • the controller is also set up to receive temperature information from the first and/or second measuring point and to control the rolling train and/or the cooling device and/or the straightening machine depending on the temperature information received from the first and/or second measuring point, whereby the degree of automation and a self-sufficient, independent optimization of the device are further promoted.
  • the temperature measuring device(s) each have at least one temperature sensor.
  • the temperature measuring device(s) are preferably set up to detect the temperature in each case in the middle of the metal strip, seen in the width direction, and/or the temperature distribution over the width of the metal strip.
  • the temperature distribution in the width direction of the metal strip usually has a higher gradient than the strip profile, especially at the strip edges before cooling or also in central areas of the metal strip shortly after leaving the cooling section.
  • a temperature measuring device is preferably installed both in the first and in the second measuring point.
  • the temperature sensors preferably work without contact, for example implemented by an infrared line scanner. If the surface temperature of the metal strip is known at one or more points in the processing line, for example through other measurements or model calculations, temperature measuring devices can be dispensed with.
  • the control circuit of the controller if present, preferably uses the temperature information received from the first and/or second measuring point as a reference variable.
  • a straightening machine is preferably arranged between the rolling mill train and the first measuring device and is set up to straighten the metal strip, i.e. to bend it into a desired shape, preferably to straighten it to improve flatness.
  • the controller is also set up to control the device as a function of the topological information received from the first and second measuring points and, if applicable, temperature information.
  • the control of the pre-leveling machine can be included in the control loop of the controller, if available.
  • a pre-leveler integrated in this way contributes to the careful straightening of the metal strip, especially in the case of sensitive strip materials, by optimally distributing the mechanical load over the cooling process. Automatic adjustment of the process to a stable state and automatic optimization with regard to product quality and/or productivity is promoted.
  • a third measuring point is preferably arranged behind the straightening machine, with the third measuring point being a further flatness measuring device for measuring has topological properties of the metal strip and can also include a further temperature measuring device.
  • the controller is also in communication with the third measuring point and is set up to receive topological information and, if applicable, temperature information from the third measuring point and the rolling train and/or the cooling device and/or the straightening machine and/or the pre-straightening machine, if present , depending on the information received from the third measuring point.
  • the topological information and, if applicable, temperature information from the third measuring point can be included as a reference variable in the control loop of the controller, if available, whereby the result after the final straightening by the straightening machine is included in the control/regulation and thus improves the entire control or regulation loop becomes.
  • the flatness measuring device of the first measuring point and/or the flatness measuring device of the second measuring point and/or the flatness measuring device of the third measuring point each have a plurality of laser-based distance sensors that are mounted across a width direction of the metal strip, whereby the corresponding flatness measuring device sends distance values to the controller several measuring points as topological information.
  • the use of laser-based distance sensors allows a particularly precise and flexible measurement.
  • the surveying grid can be adapted to different circumstances, for example changed materials or dimensions of the metal strip, without a great deal of mechanical engineering effort. A number of tasks/optimizations can be performed on the software side without having to redesign the measuring point.
  • the distance sensors and, if applicable, temperature sensors of the measuring points are preferably mounted such that they can be adjusted spatially, for example, they can be slid on a rail and/or rotated, tilted, and the like. Particularly preferably, the distance sensors and optionally the temperature sensors can be manually or automatically adjusted or relocated at least in the width direction of the metal strip.
  • the controller is preferably set up to convert the received distance values of the several measuring points into relative height differences of the measuring points, to synchronize them with positions of the measuring points in a local coordinate system of the rolled strip to determine measuring tracks and to use the measuring tracks with a predefined function to determine a topological image of the metal strip to interpolate.
  • the basic idea of such processing of the topological data is based on the assumption that the shape of the metal strip can be described by a continuous and smooth function, preferably a polynomial function or spline function. In this way, the measuring points of the distance sensors can be further processed to produce a topological image of the metal strip that can be visualized and used in other ways.
  • the controller is preferably also set up to evaluate the topological image of the metal strip using self-learning algorithms and/or neural networks, which means that in addition to quantitative measurement results, qualitative statements can be made fully automatically and used for automated optimization of the overall process.
  • the controller is preferably set up to detect and correct topological defects, preferably flatness defects, from the topological information of the first and/or second and/or third measuring point, in particular using self-learning algorithms and/or neural networks.
  • a method for producing a rolled metal strip comprising: deforming the metal strip by rolling in a rolling train while the metal strip is being transported along a conveying direction; detecting topological properties of the metal strip formed by the rolling train by means of a flatness measuring device at a first measuring point; then cooling the metal strip by means of a cooling device with variable cooling capacity; Detecting topological properties of the through the cooling device cooled metal strip by means of a flatness measuring device at a second measuring point; then straightening the metal strip, preferably improving the flatness of the metal strip, by means of a straightening machine; receiving topological information from the first and second measurement site by a controller; and controlling the rolling train and/or the cooling device and/or the straightening machine as a function of the topological information received from the first and second measuring point.
  • the controller preferably implements a control loop, with the control controlling the rolling train and/or the cooling device and/or the leveler and/or pre-leveler, if present, with the data from the first and/or second measuring point and/or or third measuring point, if available, includes received topological information as a reference variable.
  • the first measuring point includes a temperature measuring device that detects a surface temperature of the metal strip before cooling by the cooling device
  • the second measuring point includes a temperature measuring device that detects a surface temperature of the metal strip after cooling by the cooling device
  • the controller in this case Receives temperature information from the first and/or second measuring point and controls the rolling train and/or the cooling device and/or the leveler and/or the pre-leveler, if present, depending on the temperature information received from the first and/or second measuring point.
  • the measurements of a possible third measuring point behind the straightening machine can be included.
  • the temperature information from one or more of the measuring points can act as a reference variable in a control loop of the controller.
  • the flatness measuring device of the first measuring point and/or the flatness measuring device of the second measuring point each comprise a plurality of laser-based distance sensors that are mounted across a width direction of the metal strip, as a result of which the corresponding flatness measuring device provides the controller with distance values at a number of measuring points as topological information.
  • the controller preferably carries out the following data processing: converting the received distance values of the plurality of measurement points into relative height differences of the measurement points; synchronizing the measurement with positions of the measurement points in a local coordinate system of the rolled strip to determine measurement tracks; and interpolating the measurement tracks with a predefined function to determine a topological image of the metal strip.
  • the controller preferably also evaluates the topological image using self-learning algorithms and/or neural networks.
  • FIG. 1 shows a schematic representation of a device for producing a rolled metal strip
  • FIG. 2 shows a schematic view of a measuring point with a flatness and temperature measuring device.
  • the device 1 shows a device 1 for producing a rolled metal strip B.
  • the device 1 has a rolling train 10 with one or more roll stands 11 and a cooling/straightening device 20 for cooling and straightening the metal strip B, which is connected to the rolling train 10.
  • the device 1 is preferably part of a hot strip mill.
  • the metal strip B is transported along a conveying direction F through the rolling train 10 and the cooling/straightening device 20 .
  • Designations of spatial relations such as “before”, “behind”, “first”, “last”, “upstream”, “downstream”, “between”, “transverse” etc. refer to the conveying direction F.
  • the metal strip B is on transported in the usual way over a roller table 90 (see FIG. 2) and guided along the conveying direction F.
  • the metal strip B is used here as the rolling stock, with all intermediate products such as slabs, heavy plate, finished plate and the like collectively falling under the term “metal strip”.
  • the term “metal strip” also includes all metals and alloys in sheet form that are suitable for rolling, in particular steel and non-ferrous metals such as aluminum or nickel alloys.
  • the device 1 is particularly preferably used for steel sheet production, ie it can primarily be used on all steel sheets whose material properties are adjusted in an in-line continuous cooling process after the rolling process. However, the device 1 is also applicable to metal strips B that are not subject to an in-line continuous cooling process; in this case, it serves to improve profile and flatness regulation in the rolling process.
  • the roll stands 11 are preferably each designed as a four-high stand (four-high roll stand), comprising two parallel, opposite work rolls 11a, which form a roll gap, and two associated back-up rolls 11b, which are correspondingly in contact with the work rolls 11a in order to to support work rolls 11a.
  • the rolling train 10 preferably functions as a roughing train that is set up to roll a rolling stock, for example a slab coming from a continuous casting plant, into a heavy plate.
  • the heavy plate then passes through the cooling/levelling device 20, in which it is cooled and leveled to produce the desired flatness, and can then be finish-rolled to a desired final gauge in a finishing train (not shown).
  • the cooling/straightening device 20 comprises a cooling device 30 which has one or more nozzle arrangements 31 each with a plurality of nozzles 31a.
  • the nozzle arrangements 31 define a continuous cooling section in which the metal strip B is cooled in a targeted manner and which, apart from any measuring points/sensors, preferably begins immediately behind the rolling train 10 or behind a pre-leveling machine 40, as shown in the exemplary embodiment in FIG.
  • other units such as a descaler, a thermal insulation hood, shears and the like, can certainly also be installed.
  • the nozzle arrangements 31 comprise a fluid system with pump(s), distribution line(s), valve(s) and the like, not shown in detail in FIG. 1, around the nozzles 31a with a fluid cooling medium, preferably water or a water mixture.
  • the nozzles 31a are set up to spray the cooling medium onto the metal strip B, in particular the two strip surfaces.
  • the nozzles 31a are suitably positioned and aligned in order to apply a variable amount of cooling medium to the metal strip B, preferably controllable in sections along the cooling section and/or over the width of the cooling section.
  • the cooling characteristics can be influenced by adjusting the height of the nozzle arrangement(s) 31 or by other technical means for manipulating the amount of coolant and/or coolant distribution.
  • the cooling capacity can preferably be regulated by width masking and/or divided cooling units with adjustable water flows for inner and outer zones along the cooling section and/or across the width of the cooling section. In this way, it is possible to react extremely flexibly to any unevenness measured in the cooling section.
  • a straightening machine 50 is arranged behind the cooling device 30, which is set up to bend the metal strip B, in particular its profile in the width direction b (cf. FIG. 2), i.e. transversely to the conveying direction F, into a desired shape, in particular to optimize the flatness to straighten.
  • the leveling machine 50 and any pre-leveling machine 40 eliminate, for example, distortions, internal stresses or deformations on the metal strip B, which can result from rolling processes, thermal and/or other loads.
  • the metal strip B runs through the straightening machine(s) 40, 50, in which the material is guided through a group of upper and lower straightening rollers 41, 51 and is plastically deformed by adjusting the straightening rollers 41, 51 accordingly.
  • the cooling/straightening device 20 has at least two measuring points 60, 70 in order to be able to specifically control or regulate the cooling capacity in the cooling section and the straightening machine(s) 40, 50, as explained in detail below.
  • a first measuring point 60 is arranged in front of the cooling device 30, preferably between the pre-leveling machine 40 and the cooling device 30, and a second measuring point 70 is arranged behind the cooling device 30.
  • the measuring points 60, 70 each include at least one flatness measuring device 61, 71, which is explained further below with reference to FIG.
  • the measuring points 60, 70 also each have at least one temperature measuring device 62, 72 (cf. FIG. 2), it also being possible for the temperature measurement to be carried out by separate devices.
  • a third measuring point 80 with an analog structure can be installed behind the straightening machine 50 .
  • the device 1 also has a controller 100 which is set up to control and/or regulate the processing of the metal strip B, in particular the rolling, cooling and straightening process.
  • the controller 100 is in communication with the components of the device 1 to be controlled and/or regulated, as well as with the measuring points 60, 70, 80 and any other probes/sensors. Communication can be wireless or wired, digital or analog. Furthermore, a data or signal exchange in only one direction is subsumed herein under the term "communication".
  • the controller 100 does not necessarily have to be implemented by a central computing device, but rather includes decentralized and/or multi-level and hierarchical systems, control networks, cloud systems and the like.
  • the control 100 can also be an integral part of a higher-level system control or communicate with such.
  • a flatness measurement of the metal strip B takes place at least before and after the cooling section, defined by the cooling device 30, by means of the first and second measuring point 60, 70 instead.
  • a third measuring point 80 can be installed behind the straightening machine 50 .
  • FIG. 1 An exemplary embodiment of a measuring point 60, 70, 80 is shown in FIG.
  • the first and second measuring points 60, 70 and the optional third measuring point 80 are constructed essentially identically, so that the description of FIG. 2 does not differentiate between the first, second and third measuring points 60, 70, 80.
  • the measuring points 60, 70, 80 can also differ structurally depending on requirements.
  • the measuring point 60, 70, 80 has a flatness measuring device 61, 71, 81, which is set up to measure the profile of the metal strip B in the width direction b.
  • the flatness measuring device 61, 71, 81 preferably works without contact, in particular using laser-based distance sensors 61a, 71a, 81a.
  • seven distance sensors 61a, 71a, 81a are installed above the metal strip B. More or fewer distance sensors 61a, 71a, 81a can be installed as required.
  • the distance sensors 61a, 71a, 81a are mounted across the width of the roller table 90, preferably symmetrically to the middle of the roller table.
  • the statistical distribution of the rolled product widths can be used for the optimal positioning of the distance sensors 61a, 71a, 81a, in which the largest possible number of metal strips B is detected with a number of measuring tracks.
  • the distance sensors 61a, 71a, 81a have an absolute accuracy of about 1 mm at a maximum measuring frequency of 200 Hz, for example.
  • the distance to the surface of the metal strip B is determined by evaluating the phase shift of the reflected laser beam.
  • the measuring point 60, 70, 80 also has a temperature measuring device 62, 72, 82, each with at least one temperature sensor 62a, 72a, 82a.
  • the temperature measuring device 62, 72, 82 is preferably set up to Temperature in the middle of the metal strip B, seen in width direction b, and / or to detect the temperature distribution across the width of the metal strip B.
  • the temperature sensor 62a, 72a, 82a is preferably installed centrally with respect to the roller table 90.
  • the temperature distribution in the width direction b of the metal strip B generally has a higher gradient than the strip profile, in particular at the strip edges before cooling or also in central areas of the metal strip B shortly after leaving the cooling section.
  • a temperature measuring device 62, 72, 82 is preferably installed in all measuring points 60, 70, 80.
  • the temperature sensor 62a, 72a, 82a preferably works in a non-contact manner, for example implemented by an infrared line scanner, and is generally designed in such a way that it essentially determines the surface temperature of the metal strip B.
  • the temperature range of the temperature sensor 62a, 72a, 82a is, for example, in the range of 200° C. to 1500° C., and it measures, for example, at a frequency of up to 150 Hz for 1000 points over the scanned area. If the surface temperature of the metal strip B is known at one or more points in the processing line, for example through other measurements or model calculations, temperature measuring devices 62, 72, 82 in the measuring points 60, 70, 80 may be dispensed with.
  • the distance sensors 61a, 71a, 81a and temperature sensors 62a, 72a, 82a are preferably spatially adjustable, for example mounted on a rail 63, 73, 83 so that they can be moved.
  • the installation allows the distance sensors 61a, 71a, 81a and temperature sensors 62a, 72a, 82a to be manually or automatically displaced at least in the width direction of the roller table 90.
  • the distance sensors 61a, 71a, 81a and temperature sensors 62a, 72a, 82a are mounted (possibly via the rail 63, 73, 83) on a frame 64, 74, 84, which extends over the roller table 90 like a bridge.
  • the frame 64, 74, 84 is at a certain distance from the cooling section, defined by the cooling device 30, installed to avoid errors in measurement due to possible leaking coolant.
  • the frame 64, 74, 84 has, for example, a width of about 9 meters and a height of about 6 meters above the roller table level.
  • Controller 100 is responsible for evaluating and further processing the measurement signals from distance sensors 61a, 71a, 81a and temperature sensors 62a, 72a, 82a.
  • the first measuring point 60 is installed in front of the cooling device 30, preferably behind the pre-leveling machine 40, if present.
  • the flatness measuring device 61 and/or temperature measuring device 62 can be mounted on the pre-leveling machine 40 on the side of the cooling section via a carrier.
  • the first and second measuring point 60, 70 as well as the optional third measuring point 80 and a correspondingly designed control 100 enable a process-related integration of a flatness measurement into the in-line cooling and straightening process, as well as retrospectively into the profile and flatness control of the device 1 .
  • Any flatness defects can be detected automatically, including a classification of flatness defects, and can be corrected, preferably using machine learning or AI algorithms.
  • the optional third measuring point 80 allows an additional flatness measurement after the final straightening in order to check the straightening result and to improve the entire control or regulation loop.
  • the measured temperature and profile traces are stored, for example, in a database with a metal strip number, a time stamp, conveying speed and any other process parameters.
  • the flatness measurement requires more extensive data pre-processing, which is described in more detail below:
  • Flat products are not only evaluated and qualified according to quality parameters such as mechanical properties, surface defects and cross-section geometry, but also according to flatness.
  • the edge and medium waves are the most frequently registered errors.
  • the cause may be excessive residual stresses in the cross section, which can be caused by uneven expansion during the forming steps and also due to uneven cooling.
  • the flatness of the metal strip B can be influenced by changing the internal stress distribution.
  • straightening after the cooling process can eliminate any flatness errors; however, this can lead to a deterioration in the mechanical properties due to the hardening of the material.
  • the avoidance or reduction of internal stresses during cooling also poses an enormous challenge for the cooling technology.
  • the in-line measurement of the topology of the metal strip B presented here opens up the possibility of controlling and optimizing the forming processes in the rolling train 10, the cooling in the cooling device 30, the straightening in the straightening machines 40, 50 and any heat treatment with regard to the quality of the flatness.
  • a measuring point 60, 70, 80 comprises a plurality of distance sensors 61a, 71a, 81a, which are preferably mounted symmetrically to the center of the roller table 90 in accordance with the statistical distribution of the product widths over the roller table 90.
  • the statistical distribution serves for the optimal positioning of the distance sensors 61a, 71a, 81a, in which the largest possible number of different metal strips B can be detected with as many measuring tracks as possible over the strip width b.
  • the measurement preferably runs continuously, with the metal strip B to be measured moving under the flatness measuring device 61 , 71 , 81 .
  • the basic idea of such a structure is based on the assumption that the shape of the metal Iband B can be described by a continuous and smooth function.
  • the strength and thickness of the rolled products mean that the curvature function over the strip width b usually appears as a polynomial function or spline function of a smaller order.
  • a preferred method for measuring the flatness or topology of the metal strip B and processing the measurement data by the controller 100 comprises the following steps: a) measuring distances to the surface of the metal strip B at discrete positions over the strip width b using the distance sensors 61a, 71a, 81a; b) converting the distances into relative height differences of the measuring points; c) synchronizing the measurement with positions of the measurement points in a local coordinate system of the rolled strip B via the position of the rolled strip B relative to the position of the flatness measuring device 61, 71, 81 for determining measuring tracks; d) interpolating the measurement traces with a predefined function to determine a topological image or another measure of the flatness and optionally visualizing the image or the flatness; e) Optional storage of the topological image in the form of an image for classification using self-learning algorithms, preferably using neural networks with several intermediate layers (“deep learning” algorithms) in order to be able to make fully automatic qualitative statements in addition to quantitative measurement results
  • the data processing of the measured distances can be carried out fully automatically and by using statistical methods, for example the so-called “Gaussian Mixture Models” (GMM method).
  • GMM method Gaussian Mixture Models
  • the statistical processing of the measurement data can be used to assess the quality of the measurements, for example taking into account the variance of the distribution, and can thus be used synergistically as an indicator for the state of the measuring point(s) 60, 70, 80, which, for example, indicates the need for a Cleaning and/or repairing the distance sensors 61a, 71, 81a and temperature sensors 62a, 72a, 82a.
  • the controller 100 preferably implements a control loop that uses the temperature and profile data obtained in this way as reference variable(s) for automated straightening and/or cooling.
  • the device 1 presented here and the method for producing a rolled metal strip B allow verification of any deviations from the flatness of the metal strip B that occur during the in-line cooling and straightening process. This enables optimization of the cooling strategies to reduce flatness deviations in the metal strip B on the basis of statistical analysis and correlations of process settings and flatness values determined.
  • the flatness measurements carried out in this way can be fed into the system automation of the cooling device 30, straightening machine(s) 40, 50, rolling train 10 and any profile and flatness control of a finishing rolling stand.
  • the integral measurement and control structure allows the use of machine learning methods in the manufacturing process by processing the measured flatness values.
  • setting values for the leveling machine(s) 40, 50 can be derived automatically and leveling passes can be saved, which is important for the production of steel sheets from certain materials (e.g. TRIP steels or other steels with retained austenite) in order to start the hardening process after cooling to stimulate as little as possible in the cooling section. This also applies, for example, to pipe steels with specific yield point/tensile strength ratios.
  • a manual flatness assessment by an operator can be omitted. This relieves the operating personnel and standardizes the process, which means that less expertise is required to use and operate the device 1 .
  • the automation of the cooling and straightening process presented here contributes to an improvement in the quality of the rolling stock, in particular with regard to flatness.
  • the improvement in the flatness of the metal strip B in the cooling process results in an improvement in the homogeneity of the material properties throughout the rolled plate.
  • the automation of the cooling and straightening process also contributes to improving the reliability and durability of the device 1, for example by reducing the risk of damage to the straightening rollers 41, 51 through correct adjustment of the front rollers 41, 51 of the Leveler(s) 40, 50 based on information about the shape of the metal strip head.

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

Abstract

L'invention concerne un dispositif (1) et un procédé de production d'une bande métallique laminée (B), de préférence une bande métallique laminée à chaud (B). Le dispositif (1) comprend : une ligne de laminage (10) qui est conçue pour former de manière plastique la bande métallique (B) pendant un transport le long d'une direction de convoyage (F) par laminage ; une unité de refroidissement (30) avec une puissance de refroidissement variable, qui est disposée en aval de la ligne de laminage (10) dans la direction de transport (F) et est conçue pour refroidir la bande métallique (B) ; une machine à redresser (50) qui est disposée en aval de l'unité de refroidissement (30) dans la direction de convoyage (F) et conçue pour plier la bande métallique (B) en une forme souhaitée, de préférence en la redressant pour améliorer la planéité ; un premier point de mesure (60) disposé entre la ligne de laminage (10) et l'unité de refroidissement (30), avec une unité de mesure de planéité (61) pour mesurer des propriétés topologiques de la bande métallique (B) ; un second point de mesure (70), disposé entre l'unité de refroidissement (30) et la machine à redresser (50), avec une autre unité de mesure de planéité (71) pour mesurer des propriétés topologiques de la bande métallique (B) ; et un dispositif de commande (100) qui est en communication avec la ligne de laminage (10), l'unité de refroidissement (30), la machine à redresser (50) et avec les premier et second points de mesure (60, 70) et qui est conçu pour recevoir des informations topologiques provenant des premier et second points de mesure (60, 70) et pour commander la ligne de laminage (10) et/ou l'unité de refroidissement (30) et/ou la machine à redresser (50) en fonction des informations topologiques reçues du premier et du second point de mesure (60, 70). Drawing_references_to_be_translated:
PCT/EP2022/080914 2021-11-16 2022-11-07 Dispositif et procédé de production d'une bande métallique laminée WO2023088703A1 (fr)

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DE102021212881.5A DE102021212881A1 (de) 2021-11-16 2021-11-16 Vorrichtung und Verfahren zur Herstellung eines gewalzten Metallbandes
DE102021212881.5 2021-11-16

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KR20130068709A (ko) * 2011-12-16 2013-06-26 주식회사 포스코 후판 롤러 교정기를 이용한 후판 압연재 평탄도 제어방법 및 그 시스템
KR20130125268A (ko) * 2012-05-08 2013-11-18 주식회사 포스코 강판 종단부 변형 방지 장치
KR101482460B1 (ko) * 2013-12-20 2015-01-13 주식회사 포스코 데이터베이스를 이용한 후판의 평탄도 제어 장치 및 방법
DE102013214344A1 (de) 2013-07-23 2015-01-29 Sms Siemag Ag Kühlstrecke und Verfahren zum Kühlen von warmgewalztem Metallband
WO2020162004A1 (fr) * 2019-02-07 2020-08-13 Ｊｆｅスチール株式会社 Procédé de commande de refroidissement pour tôle d'acier épaisse, dispositif de commande de refroidissement et procédé de production de tôle d'acier épaisse
US10994316B2 (en) 2015-12-23 2021-05-04 Posco Straightening system and straightening method

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Publication number Priority date Publication date Assignee Title
GB2472196A (en) 2009-07-27 2011-02-02 Siemens Vai Metals Tech Ltd Integral Ultrasound Flatness Gauge for Cooling Machine
DE102017212529A1 (de) 2017-07-20 2019-01-24 Sms Group Gmbh Verfahren zur Herstellung eines metallischen Bandes

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130068709A (ko) * 2011-12-16 2013-06-26 주식회사 포스코 후판 롤러 교정기를 이용한 후판 압연재 평탄도 제어방법 및 그 시스템
KR20130125268A (ko) * 2012-05-08 2013-11-18 주식회사 포스코 강판 종단부 변형 방지 장치
DE102013214344A1 (de) 2013-07-23 2015-01-29 Sms Siemag Ag Kühlstrecke und Verfahren zum Kühlen von warmgewalztem Metallband
KR101482460B1 (ko) * 2013-12-20 2015-01-13 주식회사 포스코 데이터베이스를 이용한 후판의 평탄도 제어 장치 및 방법
US10994316B2 (en) 2015-12-23 2021-05-04 Posco Straightening system and straightening method
WO2020162004A1 (fr) * 2019-02-07 2020-08-13 Ｊｆｅスチール株式会社 Procédé de commande de refroidissement pour tôle d'acier épaisse, dispositif de commande de refroidissement et procédé de production de tôle d'acier épaisse

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