EP2841215B1 - Equalisation of belt properties by means of width-dependent preliminary belt cooling - Google Patents

Equalisation of belt properties by means of width-dependent preliminary belt cooling Download PDF

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Publication number
EP2841215B1
EP2841215B1 EP13718316.6A EP13718316A EP2841215B1 EP 2841215 B1 EP2841215 B1 EP 2841215B1 EP 13718316 A EP13718316 A EP 13718316A EP 2841215 B1 EP2841215 B1 EP 2841215B1
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EP
European Patent Office
Prior art keywords
strip
rolling
metal strip
values
property
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.)
Active
Application number
EP13718316.6A
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German (de)
French (fr)
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EP2841215A1 (en
Inventor
Klaus Weinzierl
Günther Winter
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Primetals Technologies Germany GmbH
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Primetals Technologies Germany GmbH
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Application filed by Primetals Technologies Germany GmbH filed Critical Primetals Technologies Germany GmbH
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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
    • B21B37/74—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
    • 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 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
    • C21D8/0247—Modifying the physical properties 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 by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following 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
    • 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
    • C21D8/0447—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 heat treatment
    • C21D8/0463—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 heat treatment following hot rolling
    • 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
    • B21B1/24—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 in a continuous or semi-continuous process
    • 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
    • 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
    • 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
    • B21B38/06—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring tension or compression
    • 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
    • B21B38/08—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring roll-force
    • 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

Definitions

  • the present invention further relates to a computer program comprising machine code which can be processed directly by a control computer for a rolling mill for rolling a metal strip and whose execution by the control computer causes the control computer to operate the rolling mill according to such a production method.
  • the present invention further relates to a control computer for a rolling mill for rolling a metal strip.
  • a generic method and a generic device are, for example DE 102007053523 A1 known.
  • pivoting means that in a rolling stand the effective roll gap is greater on one side than on the other. So it is given a non-uniform employment of the respective rolling mill.
  • Cooling device in which the coolant (usually water) can be adjusted individually across the width.
  • a rectangular cooling valve may be divided into three areas, namely a trapezoidal part in the middle and two triangular parts left and right. Each of the three parts is independently controllable with an individual amount of water.
  • the left side can be cooled more than the right side and vice versa.
  • any such temperature decrease which is composed of a plurality of straight pieces, can be achieved with such a cooling device within the scope of the adjustment limits.
  • a cooling device is state of the art.
  • the object of the present invention is to provide opportunities to develop the above-mentioned objects such that in a simple and reliable manner, a metal strip with over the bandwidth seen homogeneous properties can be produced.
  • the procedure according to the invention is particularly advantageous because in and behind the first rolling stand of the finishing train - in particular behind the last rolling stand of the finishing train - in a comparatively simple and reliable manner over the bandwidth spatially resolved actual sizes of a third property of the metal strip can be detected, the depend on the actual values of the second property or vice versa. By detecting the actual values of the third property, therefore, the quality of the rolling model can be easily checked and optionally tracked (adapted).
  • the first property of the metal strip is the temperature of the metal strip. Furthermore, in the simplest case beyond the temperature of the metal strip, no further property of the metal strip is used as the first property.
  • the initial values are respectively recorded for a band point of the metal strip, that the activation values of the cooling device for the respective strip point are determined, that the strip points are traced on their way from the roughing mill through the cooling device and the rolling stands of the finishing train, and that the cooling device is driven in each case at the time of passing through the respective band point with the control values determined for the respective band point.
  • the acquisition of the initial values, etc. can take place for one band point in each case.
  • the working cycle may in particular be between 0.2 s and 0.5 s, for example at about 0.3 s.
  • the number of tape points for a metal band may be greater than 100. Typical numerical values are between 200 and 500 band points. In individual cases, up to 1000 band points can be utilized.
  • the third property of the metal strip may include, for example, the temperature of the metal strip on its surface and / or its thickness.
  • the second property is the temperature of the metal strip.
  • the second property of the metal strip is the material strength.
  • At least one further cooling device is arranged downstream of the location for which the expected values are determined.
  • the further cooling device it is possible for the further cooling device to be spatially resolved in the bandwidth direction in such a way that the expected values of the second property of the metal strip in the bandwidth direction are matched to one another.
  • the temperature of the metal strip can be detected spatially resolved at the location for which the expected values are determined or behind this location, and for the location at which the temperature of the metal strip is detected spatially resolved in the bandwidth direction to be at least one more Subordinate cooling device is.
  • the at least one further cooling device can be controlled so as to be spatially resolved in the bandwidth direction in such a way that the temperatures of the metal strip are aligned with one another in the bandwidth direction.
  • the location for which the expected values are determined lies behind the last mill stand of the finishing train.
  • the object of the invention is further achieved by a computer program of the type mentioned.
  • the computer program is designed in this case such that the execution of the computer program by the control computer causes the control computer to operate the rolling mill according to a production method according to the invention.
  • the task is further solved by a correspondingly programmed control computer for the rolling mill.
  • the metal strip 1 may for example consist of steel, aluminum, brass, copper or another metal.
  • the mill For rough rolling of the metal strip 1, the mill has a roughing mill 2.
  • the roughing mill 2 may be formed Offsetrüstig. Often, however, the roughing mill 2, as shown in FIG FIG. 1 a single rolling mill, in which the metal strip 1 is reversibly rolled.
  • the rolling mill furthermore has a cooling device 3.
  • the cooling device 3 is designed in such a way that it can cool the pre-rolled metal strip 1 in a spatially resolved manner in the direction of the strip width, ie that the cooling effect varies seen across the strip width.
  • the cooling device 3 as shown in FIG. 2 have a plurality of juxtaposed spray nozzles 4, which are individually controlled and seen in the bandwidth direction each act on a portion of the metal strip 1.
  • the cooling device 3 as shown in FIG. 3 - As known in the art in heavy plate mills - have two triangular outlet openings 5 and a trapezoidal outlet opening 6, which are individually controlled via a respective valve 7. Other embodiments are possible.
  • the rolling mill also has a finishing train 8.
  • the finishing train 8 has a plurality of rolling stands 9.
  • the number of rolling stands 9 can be as needed. As a rule, five to eight rolling stands 9 are present, usually six or seven rolling stands 9. For reasons of clarity, in FIG. 1 only the first roll stand 9 and the last stand 9 shown.
  • the metal strip 1 is finished rolled after cooling in the cooling device 3.
  • the last rolling mill 9 of the finishing train 8 is followed by a temperature measuring station 10.
  • the surface temperature TO of the finished rolled metal strip 1 is detected metrologically.
  • the finishing train 8 is further downstream of a cooling section 11, in which the finished rolled metal strip 1 is subjected to a defined cooling process.
  • the cooling section 11 has for this purpose a plurality of further cooling devices 12, which can be controlled individually or in groups. In FIG. 1 For reasons of clarity, only a few of the further cooling devices 12 are shown.
  • finishing train 8 is usually followed by a reel assembly 13.
  • the reel assembly 13 has at least one reel 14, by means of which the metal strip 1 is reeled to a collar 15. If the cooling section 11 is present, the reel device 13 of the cooling section 11 is arranged downstream. The cooling section 11 is thus located in This case between the finishing train 8 and the reel assembly 13th
  • the rolling mill 2 is controlled by a control computer 16.
  • the control computer 16 is programmed with a computer program 17.
  • the computer program 17 includes machine code 18 which can be processed directly by the control computer 16.
  • the processing of the machine code 18 by the control computer 16 causes the control computer 16 to control the rolling mill according to a manufacturing process.
  • the control computer 16 may also control other components of the rolling mill, for example, a pre-rolling 2 upstream furnace 19 or the cooling section 11 and optionally also the reel assembly 13.
  • the manufacturing process will be described below in connection with FIG. 4 explained in more detail.
  • the control computer 16 may be a single control computer. But it is also possible that the control computer 16 consists of several, data-technically interconnected individual computers, each of which takes on only one or more specific subtasks.
  • the control computer 16 may consist of a single computer for the control of the aggregates, a single computer for the execution of arithmetic operations such as model calculations and a single computer for receiving operator inputs and displaying results. Another or additional distribution, for example with regard to the control of system components is possible.
  • the control computer 16 may alternatively or additionally be divided into a respective individual computer for controlling the rolling stand 2, the cooling device 3 and the finishing train 8.
  • the control computer 16 implements according to FIG. 4 in a step S1 first a rolling model 20 (see FIG. 1 ).
  • the rolling model 20 may be, for example based on mathematical-physical equations.
  • the equations may in particular be algebraic equations and / or differential equations.
  • the rolling model 20 determines, based on input data of the metal strip 1 in conjunction with influences to which the metal strip 1 is exposed, the resulting rolling stock, in particular its expected temperature and / or expected material strength such as tensile strength, yield strength, yield strength and the like.
  • the input data of the metal strip 1 are, for example, its chemical composition, its thickness and its temperature.
  • a step S2 the metal strip 1 is pre-rolled in the roughing mill 2.
  • the rough rolling takes place under the control of the control computer 16.
  • the control computer 16 detects initial values of a first property of the metal strip 1 in a step S3.
  • the control computer 16 detects the initial values in the bandwidth direction with spatial resolution.
  • at least two values are detected, namely for the left and the right side of the metal strip 1 or for the center and the lateral outer area of the metal strip 1. It is also possible to detect more than two values.
  • the detection of the initial values takes place at the latest at the time when the metal strip 1 enters the cooling device 11. It can also be done sooner, for example during roughing or before rough rolling.
  • the initial values as such may be determined as needed. For example, it may be at the initial values - see FIG. 5 the temperature T of the metal strip 1 as a function of the strip thickness d (ie the temperature as a function of the location in the strip thickness direction). These initial values are usually recorded before roughing. Alternatively, it can - see FIG. 6 - in addition to the temperature T as Function on the strip thickness d to the strip thickness d of the incoming in the roughing mill 2 metal strip 1 and the rolling forces occurring during roughing FV act. These values are detected - at least partially - during rough rolling of the metal strip 1. If the strip thickness d and the rolling forces FV during pre-rolling are detected, these values are also detected spatially resolved in the bandwidth direction.
  • step S2-depending on the configuration of the production method- can be carried out before step S3.
  • the step S2 may be executed simultaneously with the step S3 or after the step S3.
  • Mixed forms can also make sense.
  • the control computer 16 supplies the detected initial values to the rolling model 20 in a step S4.
  • the control computer 16 continues to feed the finishing pattern 8 to the rolling pattern 20 in step S4.
  • the keyway data include Sollwalzspalte, Sollstichab66, expected rolling forces, in the rolling operations before and / or behind the corresponding rolling stand 9 occurring trains and the like.
  • the stitch plan data may alternatively be spatially resolved over the bandwidth, uniformly or across the bandwidth. In the case of spatial resolution, the stitch plan data may alternatively be symmetric, antisymmetric or asymmetric.
  • the control computer 16 sets activation values S for the cooling device 3 in a step S5.
  • the drive values S are resolved in the bandwidth direction.
  • the control computer 16 determines expected values for a second property of the metal strip 1 in a step S6 by means of the rolling model 20.
  • the determined expected values depend, at least inter alia, on the initial values locally corresponding in the bandwidth direction and the drive values S locally locally corresponding in the bandwidth direction the cooling device 3 from.
  • the control computer 16 determines the expected values for a location at the first rolling stand 9 of the finishing train 8 or behind For example, for the location of the first, second, etc. rolling stand 9 of the finishing train 8 or for a place behind the finishing train 8, ie behind the last rolling stand 9 of the finishing train 8.
  • the corresponding location of the location of the temperature measuring station 10 may be.
  • the control computer 16 determines the expected values in the bandwidth direction with spatial resolution. For example, the control computer 16 as a second property, the temperature T of the metal strip 1 or a mechanical property of the metal strip 1 - for example, a material strength - determine. If the control computer 16 determines the temperature T, it usually determines it for the location of the temperature measuring station 10. If the control computer 16 determines mechanical properties, it usually determines them for the location of one of the rolling stands 9 of the finishing train 8 or for the locations several rolling stands 9 of the finishing train 8.
  • the control computer 16 compares the determined expected values in a step S7 with nominal values of the second properties of the metal strip 1.
  • the nominal values can be uniform across the bandwidth. Alternatively, they can vary across the bandwidth seen, so be spatially resolved. Regardless of whether the setpoint values vary over the bandwidth or not, the control computer 16 carries out the comparison, however, in a spatially resolved manner in the bandwidth direction. In accordance with the result of the comparison, the control computer 16 varies the activation values S in a step S8. The control computer 16 carries out the variation in such a way that the expected values-spatially resolved in the bandwidth direction-are approximated to the desired values.
  • control computer 16 it is possible for the control computer 16 to immediately set the activation values S in such a way that the expected values are brought as close as possible to the desired values. Alternatively, it is possible that the steps S6, S7 and S8 are iterated.
  • control computer 16 controls the cooling device 3 in a step S9 in accordance with the determined activation values S.
  • the control computer 16 detects according to FIG. 4 in a step S10 at the location for which he has determined the expected values of the second property, actual values of a third property of the metal strip 1. For example, the control computer 16 according to FIG. 5 at the temperature measuring station 10, the temperature TO of the metal strip 1 on its surface detect. Alternatively or additionally, the control computer 16 according to FIG. 6 during finish rolling, the trains Z occurring in front of and / or behind the rolling stands 9 of the finishing train 8 detect the rolling forces F occurring in the rolling stands 9 of the finishing train 3 and the jobs occurring in the rolling stands 9 of the finishing train 8.
  • the actual values of the detected third property depend on actual values of the second property.
  • the temperature TO of the metal strip 1 on its surface obviously depends on the temperature T of the metal strip 1.
  • the rolling forces F depend, for example, on the material hardening and on the temperature T. It is therefore possible for the control computer 16, in a step S11, to adapt the rolling model 20 on the basis of a comparison, the expectation values of the second property and the actual values of the third property being included in the comparison. It is possible, for the purpose of comparability on the basis of the expectation values of the second property, to determine corresponding expectation values of the third property and to make the comparison on the level of the third property. Alternatively, it is possible to determine the corresponding actual values of the second property from the actual values of the third property and to make the comparison at the level of the second property.
  • the adaptation of the rolling model 20 can be configured as needed.
  • the temperature T as a function of the strip thickness d in the context of the rolling model 20 is determined.
  • the determination rule for determining the temperature T as a function of the strip thickness d can be adapted. Regardless of how the adaptation is exactly realized, however, the adaptation is spatially resolved in the bandwidth direction.
  • the detection of the initial values can take place in each case.
  • each band point 21 corresponds to a portion of the metal band 1 defined by the respective transport speed v of the metal band 1 at the detection time and the power stroke.
  • the band points 21 may correspond to portions of the metal band 1 of predefined length, for example, a length of 10, 15, 20,... Cm.
  • the band points 21 may correspond to a predefined mass, for example 20, 30, 50, ... 100 kg.
  • the determination of the expected values also takes place individually for the respective belt point 21.
  • the belt points 21 are tracked on their way from the roughing mill 2 through the cooling device 3 and the rolling stands 9 of the finishing train 8 ,
  • the cooling device 3 is controlled in each case at the time of passing through the respective band point 21 with the control values S determined for the respective band point 21.
  • the implementation of a tracking including the timely control of the individual devices 2, 3, 9 of the rolling mill is well known to those skilled in the art.
  • the control of the rolling stands 9 of the finishing train 8 is done in this case individually for the respective band point 21. If actual values of at least one third property of the metal strip 1 are detected, this detection also takes place according to the tracking for the respective band point 21. This applies regardless of whether the surface temperature TO, the rolling forces F, the rolling stand positions s, the trains Z, etc. are detected as actual values of the third property.
  • further cooling devices 12 can be arranged downstream of the location for which the expected values are determined. If at least one of the further cooling devices 12 can be controlled in a spatially resolved manner in the bandwidth direction, this activation can be carried out in such a way that the expected values of the second properties in the bandwidth direction are approximated to one another. This embodiment can be realized independently of what the second property of the metal strip 1 is.
  • the temperature TO of the metal strip 1 can be detected spatially resolved at the location for which the expected values are determined or behind this location in the bandwidth direction.
  • the temperature measuring station 10 may be present regardless of whether the temperature T of the metal strip 1 or its material strength is used as a second property. In the former case, the temperature detection usually takes place at the location for which the expected values are determined. In the latter case, the temperature detection takes place behind the location for which the expected values are determined. Because in this case, the expected values are generally determined for the location of at least one rolling stand 9 of the finishing train 8, ie before the temperature measuring station 10.
  • At least one of the further cooling devices 12, that is to say a cooling device 12 of the cooling section 11, is controlled in a spatially resolved manner in the bandwidth direction.
  • the activation of the corresponding cooling device 12 can take place in such a way that the temperature T of the metal strip 1 is adjusted in the direction of the strip width.
  • the present invention has many advantages.
  • homogenization of material properties can be achieved by means of the width-dependent cooling of the metal strip 1 before the finish rolling.

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

Description

Die vorliegende Erfindung betrifft ein Herstellungsverfahren für ein Metallband,

  • wobei das Metallband in einem Vorwalzwerk vorgewalzt wird, sodann in einer Kühleinrichtung gekühlt wird und schließlich in einer Fertigstraße mit mehreren Walzgerüsten fertiggewalzt wird.
The present invention relates to a production method for a metal strip,
  • wherein the metal strip is pre-rolled in a rough rolling mill, then cooled in a cooling device and finally finish rolled in a finishing train with a plurality of rolling stands.

Die vorliegende Erfindung betrifft weiterhin ein Computerprogramm, das Maschinencode umfasst, der von einem Steuerrechner für ein Walzwerk zum Walzen eines Metallbandes unmittelbar abarbeitbar ist und dessen Abarbeitung durch den Steuerrechner bewirkt, dass der Steuerrechner das Walzwerk gemäß einem derartigen Herstellungsverfahren betreibt.The present invention further relates to a computer program comprising machine code which can be processed directly by a control computer for a rolling mill for rolling a metal strip and whose execution by the control computer causes the control computer to operate the rolling mill according to such a production method.

Die vorliegende Erfindung betrifft weiterhin einen Steuerrechner für ein Walzwerk zum Walzen eines Metallbandes.The present invention further relates to a control computer for a rolling mill for rolling a metal strip.

Die vorliegende Erfindung betrifft weiterhin ein Walzwerk zum Walzen eines Metallbandes,

  • wobei das Walzwerk ein Vorwalzwerk aufweist, in dem das Metallband vorgewalzt wird,
  • wobei das Walzwerk eine Kühleinrichtung aufweist, in der das Metallband nach dem Vorwalzen gekühlt wird,
  • wobei das Walzwerk eine Fertigstraße mit mehreren Walzgerüsten aufweist, in denen das Metallband nach dem Kühlen fertiggewalzt wird,
  • wobei das Walzwerk einen Steuerrechner aufweist.
The present invention further relates to a rolling mill for rolling a metal strip,
  • the rolling mill having a roughing mill in which the metal strip is pre-rolled,
  • the rolling mill having cooling means in which the metal strip is cooled after rough rolling,
  • wherein the rolling mill comprises a finishing train with a plurality of rolling mills, in which the metal strip is finish-rolled after cooling,
  • wherein the rolling mill has a control computer.

Ein gattungsgemäßes Verfahren sowie eine gattungsgemäße Vorrichtung sind z.B. aus DE 102007053523 A1 bekannt.A generic method and a generic device are, for example DE 102007053523 A1 known.

In einer Warmbandstraße entsteht ein schlechter Bandlauf häufig aufgrund einer oder mehrerer der folgenden Gegebenheiten:

  • Brammen werden in einem Ofen ungleichmäßig erwärmt. Insbesondere wird oftmals die näher an der Ofentür liegende Seite der Bramme nicht so stark aufgeheizt wie die von der Tür abgewandte Seite der Bramme. Dadurch ist die Durchwärmung der Bramme über die Bandbreite gesehen ungleichmäßig.
  • Die Bramme ist auf einer Seite dicker als auf der anderen. Dies kann insbesondere dann der Fall sein, wenn sogenannte Spaltbrammen verwendet werden. Spaltbrammen sind Brammen, bei denen eine gegossene Bramme nach dem Stranggießen noch einmal längs geteilt wird. Ist die gegossene Bramme in der Mitte etwas dicker als am Rand, sind die beiden Spaltbrammen auf einer Seite dicker als auf der anderen.
  • Materialeigenschaften sind in der Mitte des gegossenen Stranges anders als an den Seiten des gegossenen Stranges. Werden Spaltbrammen verwendet, ist beispielsweise in der Regel die Festigkeit auf einer Seite der Bramme größer als auf der anderen.
In a hot strip mill, poor striping often occurs due to one or more of the following conditions:
  • Slabs are heated unevenly in an oven. In particular, often the side closer to the oven door the slab was not heated as much as the side of the slab facing away from the door. As a result, the heating of the slab seen over the bandwidth is uneven.
  • The slab is thicker on one side than the other. This can be the case in particular when so-called split slabs are used. Slit slabs are slabs in which a cast slab is split once again after continuous casting. If the cast slab is slightly thicker in the middle than at the edge, the two split slabs are thicker on one side than on the other.
  • Material properties are different in the middle of the cast strand than on the sides of the cast strand. If slit slabs are used, for example, the strength is generally greater on one side of the slab than on the other.

Im Stand der Technik wird meist versucht, die Geometrie des Vorbandes in dem Vorwalzwerk so gut wie möglich zu beeinflussen. Zu diesem Zweck wird in dem Vorwalzwerk die Abnahme auf den beiden Seiten der Bramme geeignet eingestellt, um aus einer zunächst keilförmigen Bramme ein gleichmäßiges Vorband zu erzeugen. Dies führt jedoch zu einem Bandsäbel, sofern nicht dem Bandsäbel entgegen wirkende Maßnahmen ergriffen werden. Es ist jedoch bereits bekannt, durch von der Seite einwirkende Biegeeinrichtungen die Bramme wieder gerade zu biegen. Auf diese Weise kann ein gerades Vorband mit in Breitenrichtung konstanter Banddicke erzeugt werden.In the prior art, it is usually attempted to influence the geometry of the pre-strip in the roughing mill as well as possible. For this purpose, the decrease on the two sides of the slab is adjusted suitably in the roughing mill to produce a uniform pre-band from an initially wedge-shaped slab. However, this leads to a band saw, unless the bandsaw counteracting measures are taken. However, it is already known to bend the slab straight again by bending devices acting from the side. In this way, a straight pre-strip can be produced with widthwise constant strip thickness.

In der dem Vorwalzwerk nachgeordneten Fertigstraße wird der Bandlauf durch Schwenken einzelner, mehrerer oder aller Gerüste vergleichmäßigt. Der Begriff "schwenken" bedeutet, dass bei einem Walzgerüst der wirksame Walzspalt auf einer Seite größer ist als auf der anderen. Es ist also eine ungleichmäßige Anstellung des jeweiligen Walzgerüstes gegeben.In the downstream of the roughing mill finishing train of the tape is equalized by pivoting individual, several or all scaffolding. The term "pivoting" means that in a rolling stand the effective roll gap is greater on one side than on the other. So it is given a non-uniform employment of the respective rolling mill.

Weiterhin wird im Stand der Technik versucht, durch eine Kühleinrichtung hinter dem Vorwalzwerk die Temperatur des Vorbandes zu homogenisieren. Von Vorteil ist hierbei eine Kühleinrichtung, bei welcher das Kühlmittel (in der Regel Wasser) über die Breite individuell eingestellt werden kann. Beispielsweise kann ein rechteckförmiges Kühlventil in drei Bereiche unterteilt sein, nämlich einem trapezförmigen Teil in der Mitte und zwei dreieckförmige Teile links und rechts. Jeder der drei Teile ist mit einer individuellen Wassermenge unabhängig steuerbar. Mit einer derartigen Kühleinrichtung kann beispielsweise die linke Seite stärker gekühlt werden als die rechte Seite und umgekehrt. Allgemein gesprochen kann mit einer derartigen Kühleinrichtung im Rahmen der Stellbegrenzungen eine beliebige Temperaturabnahme, die sich aus mehreren geraden Stücken zusammensetzt, erzielt werden. Für Grobblech ist eine derartige Kühleinrichtung Stand der Technik.Furthermore, attempts are made in the prior art to homogenize the temperature of the pre-strip by means of a cooling device behind the pre-rolling mill. An advantage here is one Cooling device, in which the coolant (usually water) can be adjusted individually across the width. For example, a rectangular cooling valve may be divided into three areas, namely a trapezoidal part in the middle and two triangular parts left and right. Each of the three parts is independently controllable with an individual amount of water. With such a cooling device, for example, the left side can be cooled more than the right side and vice versa. Generally speaking, any such temperature decrease, which is composed of a plurality of straight pieces, can be achieved with such a cooling device within the scope of the adjustment limits. For heavy plate such a cooling device is state of the art.

Im Stand der Technik wird weiterhin die Temperatur zwischen der Vorbandkühlung und dem Einlauf der Fertigstraße erfasst, um die Kühlergebnisse zu verifizieren. Dies führt jedoch nur zu unbefriedigenden Ergebnissen. Weiterhin wirken im Stand der Technik bei gleichmäßigem Bandlauf in der Regel ungleichmäßige Walzkräfte über die Breite. Ungleichmäßige Materialeigenschaften über die Breite bleiben erhalten und können nachfolgende Prozessschritte (beispielsweise ein Kaltwalzen) stören.In the prior art, the temperature between the pre-strip cooling and the inlet of the finishing train is further detected in order to verify the cooling results. However, this only leads to unsatisfactory results. Furthermore, in the state of the art with uniform strip running, uneven rolling forces generally occur across the width. Uneven material properties across the width are retained and can interfere with subsequent process steps (for example, cold rolling).

Die Aufgabe der vorliegenden Erfindung besteht darin, Möglichkeiten zu schaffen, die oben genannten Gegenstände derart weiterzuentwickeln, dass auf einfache und zuverlässige Weise ein Metallband mit über die Bandbreite gesehen homogenen Eigenschaften hergestellt werden kann.The object of the present invention is to provide opportunities to develop the above-mentioned objects such that in a simple and reliable manner, a metal strip with over the bandwidth seen homogeneous properties can be produced.

Die Aufgabe wird durch ein Herstellungsverfahren für ein Metallband mit den Merkmalen des Anspruchs 1 gelöst. Vorteilhafte Ausgestaltungen des Herstellungsverfahrens sind Gegenstand der abhängigen Ansprüche 2 bis 11.The object is achieved by a production method for a metal strip with the features of claim 1. Advantageous embodiments of the manufacturing method are the subject of the dependent claims 2 to 11.

Erfindungsgemäß ist vorgesehen, ein Herstellungsverfahren der eingangs genannten Art dadurch auszugestalten,

  • dass spätestens beim Einlaufen des Metallbandes in die Kühleinrichtung in Bandbreitenrichtung ortsaufgelöst Anfangswerte einer ersten Eigenschaft des Metallbandes erfasst werden,
  • dass die erfassten Anfangswerte einem Walzmodell zugeführt werden,
  • dass mittels des Walzmodells für einen Ort, der bei dem oder hinter dem ersten Walzgerüst der Fertigstraße liegt, in Bandbreitenrichtung ortsaufgelöst Erwartungswerte einer zweiten Eigenschaft des Metallbandes ermittelt werden,
  • dass die Erwartungswerte von den jeweiligen Anfangswerten und von jeweiligen Ansteuerwerten der Kühleinrichtung abhängen,
  • dass die Ansteuerwerte der Kühleinrichtung mittels des Walzmodells in Bandbreitenrichtung ortsaufgelöst derart ermittelt werden, dass die Erwartungswerte in Bandbreitenrichtung ortsaufgelöst Sollwerten der zweiten Eigenschaft angenähert werden, und
  • dass die Kühleinrichtung entsprechend den ermittelten Ansteuerwerten angesteuert wird.
According to the invention, it is provided to design a production method of the type mentioned at the outset,
  • that, at the latest when the metal strip enters the cooling device, initial values of a first property of the metal strip are detected spatially resolved in the bandwidth direction,
  • that the recorded initial values are fed to a rolling model,
  • that expected values of a second property of the metal strip are determined spatially resolved in the bandwidth direction by means of the rolling model for a location located at or behind the first rolling stand of the finishing train,
  • that the expected values depend on the respective initial values and on the respective activation values of the cooling device,
  • that the drive values of the cooling device are determined spatially resolved in the bandwidth direction by means of the rolling model in such a way that the expected values in the bandwidth direction are approximated spatially resolved nominal values of the second property, and
  • the cooling device is activated in accordance with the determined activation values.

Die erfindungsgemäße Vorgehensweise ist insbesondere deshalb von Vorteil, weil bei dem und hinter dem ersten Walzgerüst der Fertigstraße - insbesondere hinter dem letzten Walzgerüst der Fertigstraße - auf vergleichsweise einfache und zuverlässige Weise über die Bandbreite ortsaufgelöst Istgrößen einer dritten Eigenschaft des Metallbandes erfasst werden können, die von den Istwerten der zweiten Eigenschaft abhängen oder umgekehrt. Durch Erfassen der Istwerte der dritten Eigenschaft kann daher die Qualität des Walzmodells ohne Weiteres überprüft und gegebenenfalls nachgeführt (adaptiert) werden.The procedure according to the invention is particularly advantageous because in and behind the first rolling stand of the finishing train - in particular behind the last rolling stand of the finishing train - in a comparatively simple and reliable manner over the bandwidth spatially resolved actual sizes of a third property of the metal strip can be detected, the depend on the actual values of the second property or vice versa. By detecting the actual values of the third property, therefore, the quality of the rolling model can be easily checked and optionally tracked (adapted).

Im einfachsten Fall ist die erste Eigenschaft des Metallbandes die Temperatur des Metallbandes. Weiterhin wird im einfachsten Fall über die Temperatur des Metallbandes hinaus keine weitere Eigenschaft des Metallbandes als erste Eigenschaft verwendet.In the simplest case, the first property of the metal strip is the temperature of the metal strip. Furthermore, in the simplest case beyond the temperature of the metal strip, no further property of the metal strip is used as the first property.

In manchen Fällen kann es ausreichen, globale Aussagen über die gesamte Länge des Metallbandes zu treffen. In diesem Fall ist es möglich, die ersten Eigenschaften nur einmal zu erfassen und die Erwartungswerte nur einmal zu ermitteln. Auch die Ansteuerung der Kühleinrichtung kann in diesem Fall einheitlich über die gesamte Bandlänge erfolgen. Vorzugsweise ist jedoch vorgesehen, dass die Anfangswerte jeweils für einen Bandpunkt des Metallbandes erfasst werden, dass die Ansteuerwerte der Kühleinrichtung für den jeweiligen Bandpunkt ermittelt werden, dass die Bandpunkte auf ihrem Weg von dem Vorwalzwerk durch die Kühleinrichtung und die Walzgerüste der Fertigstraße wegverfolgt werden und dass die Kühleinrichtung jeweils zum Zeitpunkt des Durchlaufens des jeweiligen Bandpunktes mit den für den jeweiligen Bandpunkt ermittelten Ansteuerwerten angesteuert wird. Beispielsweise kann mit einem Arbeitstakt, der zwischen 0,1 s und 1,0 s liegt, jeweils für einen Bandpunkt die Erfassung der Anfangswerte usw. erfolgen. Der Arbeitstakt kann insbesondere zwischen 0,2 s und 0,5 s liegen, beispielsweise bei ca. 0,3 s. Die Anzahl an Bandpunkten für ein Metallband kann größer als 100 sein. Typische Zahlenwerte liegen zwischen 200 und 500 Bandpunkten. In Einzelfällen können bis zu 1000 Bandpunkte verwertet werden.In some cases it may be sufficient to make global statements about the entire length of the metal strip. In this case it is possible to record the first properties only once and to determine the expected values only once. The control of the cooling device can be done uniformly over the entire band length in this case. Preferably, however, it is provided that the initial values are respectively recorded for a band point of the metal strip, that the activation values of the cooling device for the respective strip point are determined, that the strip points are traced on their way from the roughing mill through the cooling device and the rolling stands of the finishing train, and that the cooling device is driven in each case at the time of passing through the respective band point with the control values determined for the respective band point. For example, with a duty cycle of between 0.1 s and 1.0 s, the acquisition of the initial values, etc., can take place for one band point in each case. The working cycle may in particular be between 0.2 s and 0.5 s, for example at about 0.3 s. The number of tape points for a metal band may be greater than 100. Typical numerical values are between 200 and 500 band points. In individual cases, up to 1000 band points can be utilized.

Aufgrund des Umstands, dass der Ort, für den die Erwartungswerte ermittelt werden, bei dem oder hinter dem ersten Walzgerüst liegt, ist es möglich, dass mit hoher Genauigkeit in Bandbreitenrichtung ortsaufgelöst Istwerte mindestens einer dritten Eigenschaft des Metallbandes erfasst werden, dass die Istwerte der dritten Eigenschaft von Istwerten der zweiten Eigenschaft abhängen und dass das Walzmodell anhand eines Vergleichs in Bandbreitenrichtung ortsaufgelöst adaptiert wird. In den Vergleich gehen in diesem Fall die Erwartungswerte der zweiten Eigenschaft und die Istwerte der dritten Eigenschaft ein. Die dritte Eigenschaft des Metallbandes kann beispielsweise die Temperatur des Metallbandes an seiner Oberfläche und/oder dessen Dicke umfassen.Due to the fact that the location for which the expected values are determined lies at or behind the first mill stand, it is possible that actual values of at least one third property of the metal strip can be detected with high accuracy in the bandwidth direction in a spatially resolved manner, that the actual values of the third Property of actual values of the second property depend and that the rolling model is adapted spatially resolved based on a comparison in the bandwidth direction. In this case the expectation values of the second property and the actual values of the third property are included in the comparison. The third property of the metal strip may include, for example, the temperature of the metal strip on its surface and / or its thickness.

Mittels der bisher erläuterten Vorgehensweise ist es möglich, die Temperatur in Bandbreitenrichtung ortsaufgelöst an entsprechende Solltemperaturen anzugleichen. In diesem Fall ist also die zweite Eigenschaft die Temperatur des Metallbandes.By means of the procedure explained so far, it is possible to adjust the temperature in the bandwidth direction spatially resolved to corresponding desired temperatures. In this case, the second property is the temperature of the metal strip.

Ein Angleichen der Temperatur ist auch dann möglich, wenn

  • für die Bandpunkte zusätzlich zu den Anfangswerten der ersten Eigenschaft in Bandbreitenrichtung ortsaufgelöst jeweils die Dicke des in das Vorwalzwerk einlaufenden Metallbandes und die beim Vorwalzen auftretenden Walzkräfte erfasst werden,
  • die dritten Eigenschaften für die Bandpunkte jeweils beim Walzen des jeweiligen Bandpunktes in dem jeweiligen Walzgerüst der Fertigstraße erfasst werden und
  • die dritten Eigenschaften beim Fertigwalzen der Bandpunkte vor und/oder hinter den Walzgerüsten der Fertigstraße auftretende Züge, in den Walzgerüsten der Fertigstraße auftretende Walzkräfte und in den Walzgerüsten der Fertigstraße auftretende Anstellungen umfassen.
An adjustment of the temperature is possible even if
  • in addition to the initial values of the first property in the bandwidth direction, the thicknesses of the metal strip entering the roughing mill and the rolling forces occurring during roughing are detected spatially resolved in each case for the strip points,
  • the third properties for the band points are respectively detected during rolling of the respective band point in the respective rolling stand of the finishing train and
  • the third properties during finish rolling of the strip points before and / or behind the rolling stands of the finishing train occurring trains, occurring in the rolling stands of the finishing train rolling forces and occurring in the rolling stands of the finishing line jobs.

In diesem Fall ist es jedoch - alternativ zu einem Angleichen der Temperaturen - möglich, dass die zweite Eigenschaft des Metallbandes die Materialfestigkeit ist.In this case, however, it is possible - as an alternative to equalizing the temperatures - that the second property of the metal strip is the material strength.

Es ist möglich, dass dem Ort, für den die Erwartungswerte ermittelt werden, mindestens eine weitere Kühleinrichtung nachgeordnet ist. In diesem Fall ist es möglich, dass die weitere Kühleinrichtung in Bandbreitenrichtung ortsaufgelöst derart angesteuert wird, dass die Erwartungswerte der zweiten Eigenschaft des Metallbandes in Bandbreitenrichtung gesehen einander angeglichen werden.It is possible that at least one further cooling device is arranged downstream of the location for which the expected values are determined. In this case, it is possible for the further cooling device to be spatially resolved in the bandwidth direction in such a way that the expected values of the second property of the metal strip in the bandwidth direction are matched to one another.

Alternativ ist es möglich, dass an dem Ort, für den die Erwartungswerte ermittelt werden, oder hinter diesem Ort in Bandbreitenrichtung ortsaufgelöst die Temperatur des Metallbandes erfasst wird und dass dem Ort, an dem in Bandbreitenrichtung ortsaufgelöst die Temperatur des Metallbandes erfasst wird, mindestens eine weitere Kühleinrichtung nachgeordnet ist. In diesem Fall kann die mindestens eine weitere Kühleinrichtung in Bandbreitenrichtung ortsaufgelöst derart angesteuert werden, dass die Temperaturen des Metallbandes in Bandbreitenrichtung gesehen einander angeglichen werden.Alternatively, it is possible for the temperature of the metal strip to be detected spatially resolved at the location for which the expected values are determined or behind this location, and for the location at which the temperature of the metal strip is detected spatially resolved in the bandwidth direction to be at least one more Subordinate cooling device is. In this case, the at least one further cooling device can be controlled so as to be spatially resolved in the bandwidth direction in such a way that the temperatures of the metal strip are aligned with one another in the bandwidth direction.

Wie bereits erwähnt, ist es möglich, dass der Ort, für den die Erwartungswerte ermittelt werden, hinter dem letzten Walzgerüst der Fertigstraße liegt.As already mentioned, it is possible that the location for which the expected values are determined lies behind the last mill stand of the finishing train.

Die erfindungsgemäße Aufgabe wird weiterhin durch ein Computerprogramm der eingangs genannten Art gelöst. Das Computerprogramm ist in diesem Fall derart ausgestaltet, dass die Abarbeitung des Computerprogramms durch den Steuerrechner bewirkt, dass der Steuerrechner das Walzwerk gemäß einem erfindungsgemäßen Herstellungsverfahren betreibt.The object of the invention is further achieved by a computer program of the type mentioned. The computer program is designed in this case such that the execution of the computer program by the control computer causes the control computer to operate the rolling mill according to a production method according to the invention.

Die Aufgabe wird weiterhin durch einen entsprechend programmierten Steuerrechner für das Walzwerk gelöst.The task is further solved by a correspondingly programmed control computer for the rolling mill.

Die Aufgabe wird weiterhin dadurch gelöst, dass ein Walzwerk der eingangs genannten Art dadurch ausgestaltet wird,

  • dass von dem Steuerrechner spätestens beim Einlaufen des Metallbandes in die Kühleinrichtung in Bandbreitenrichtung ortsaufgelöst Anfangswerte einer ersten Eigenschaft des Metallbandes erfasst werden,
  • dass der Steuerrechner ein Walzmodell implementiert, dem die erfassten Anfangswerte zugeführt werden,
  • dass der Steuerrechner mittels des Walzmodells für einen Ort, der bei dem oder hinter dem ersten Walzgerüst der Fertigstraße liegt, in Bandbreitenrichtung ortsaufgelöst Erwartungswerte einer zweiten Eigenschaft des Metallbandes ermittelt,
  • dass die Erwartungswerte von den jeweiligen Anfangswerten und von jeweiligen Ansteuerwerten der Kühleinrichtung abhängen,
  • dass der Steuerrechner die Ansteuerwerte der Kühleinrichtung mittels des Walzmodells in Bandbreitenrichtung ortsaufgelöst derart ermittelt, dass die Erwartungswerte in Bandbreitenrichtung ortsaufgelöst Sollwerten der zweiten Eigenschaft angenähert werden, und
  • dass der Steuerrechner die Kühleinrichtung entsprechend den ermittelten Ansteuerwerten ansteuert.
The object is further achieved in that a rolling mill of the type mentioned is configured by
  • in that, at the latest when the metal strip enters the cooling device in the strip width direction, initial values of a first property of the metal strip are detected spatially resolved by the control computer,
  • that the control computer implements a rolling model to which the detected initial values are fed,
  • the control computer, by means of the rolling model for a location located at or behind the first rolling stand of the finishing train, determines location-resolved expected values of a second property of the metal strip in the bandwidth direction,
  • that the expected values depend on the respective initial values and on the respective activation values of the cooling device,
  • the control computer determines the activation values of the cooling device in a spatially resolved manner in the bandwidth direction by means of the rolling model such that the expected values in Bandwidth direction spatially resolved nominal values of the second property are approximated, and
  • the control computer controls the cooling device in accordance with the determined activation values.

Die oben beschriebenen Eigenschaften, Merkmale und Vorteile dieser Erfindung sowie die Art und Weise, wie diese erreicht werden, werden klarer und deutlicher verständlich im Zusammenhang mit der folgenden Beschreibung der Ausführungsbeispiele, die in Verbindung mit den Zeichnungen näher erläutert werden. Hierbei zeigen in schematischer Darstellung:

FIG 1
ein Walzwerk,
FIG 2 und 3
Kühleinrichtungen,
FIG 4
ein Ablaufdiagramm,
FIG 5 und 6
Ausgestaltungen von FIG 1 und
FIG 7
eine Draufsicht auf einen Teil eines Metallbandes.
The above-described characteristics, features and advantages of this invention, as well as the manner in which they are achieved, will become clearer and more clearly understood in connection with the following description of the embodiments, which will be described in more detail in conjunction with the drawings. Here are shown in a schematic representation:
FIG. 1
a rolling mill,
FIGS. 2 and 3
Cooling equipment,
FIG. 4
a flow chart,
FIGS. 5 and 6
Embodiments of FIG. 1 and
FIG. 7
a plan view of a portion of a metal strip.

Gemäß FIG 1 soll in einem Walzwerk ein Metallband 1 gewalzt werden. Das Metallband 1 kann beispielsweise aus Stahl, Aluminium, Messing, Kupfer oder einem anderen Metall bestehen.According to FIG. 1 to be rolled in a rolling mill, a metal strip 1. The metal strip 1 may for example consist of steel, aluminum, brass, copper or another metal.

Zum Vorwalzen des Metallbandes 1 weist das Walzwerk ein Vorwalzwerk 2 auf. Das Vorwalzwerk 2 kann mehrgerüstig ausgebildet sein. Oftmals weist das Vorwalzwerk 2 jedoch entsprechend der Darstellung in FIG 1 ein einzelnes Walzgerüst auf, in dem das Metallband 1 reversierend gewalzt wird.For rough rolling of the metal strip 1, the mill has a roughing mill 2. The roughing mill 2 may be formed mehrgerüstig. Often, however, the roughing mill 2, as shown in FIG FIG. 1 a single rolling mill, in which the metal strip 1 is reversibly rolled.

Das Walzwerk weist weiterhin eine Kühleinrichtung 3 auf. In der Kühleinrichtung 3 wird das Metallband 1 nach dem Vorwalzen gekühlt. Die Kühleinrichtung 3 ist derart ausgebildet, dass sie das vorgewalzte Metallband 1 in Bandbreitenrichtung ortsaufgelöst kühlen kann, d. h. dass die Kühlwirkung über die Bandbreite gesehen variiert. Beispielsweise kann die Kühleinrichtung 3 entsprechend der Darstellung in FIG 2 mehrere nebeneinander angeordnete Spritzdüsen 4 aufweisen, die individuell ansteuerbar sind und in Bandbreitenrichtung gesehen jeweils auf einen Teil des Metallbandes 1 wirken. Alternativ kann die Kühleinrichtung 3 entsprechend der Darstellung in FIG 3 - wie im Stand der Technik bei Grobblechstraßen bekannt - zwei dreieckförmige Auslassöffnungen 5 und eine trapezförmige Auslassöffnung 6 aufweisen, die über je ein Ventil 7 individuell ansteuerbar sind. Auch andere Ausgestaltungen sind möglich.The rolling mill furthermore has a cooling device 3. In the cooling device 3, the metal strip 1 is cooled after rough rolling. The cooling device 3 is designed in such a way that it can cool the pre-rolled metal strip 1 in a spatially resolved manner in the direction of the strip width, ie that the cooling effect varies seen across the strip width. For example, the cooling device 3 as shown in FIG FIG. 2 have a plurality of juxtaposed spray nozzles 4, which are individually controlled and seen in the bandwidth direction each act on a portion of the metal strip 1. Alternatively, the cooling device 3 as shown in FIG FIG. 3 - As known in the art in heavy plate mills - have two triangular outlet openings 5 and a trapezoidal outlet opening 6, which are individually controlled via a respective valve 7. Other embodiments are possible.

Das Walzwerk weist weiterhin eine Fertigstraße 8 auf. Die Fertigstraße 8 weist mehrere Walzgerüste 9 auf. Die Anzahl an Walzgerüsten 9 kann nach Bedarf sein. In der Regel sind fünf bis acht Walzgerüste 9 vorhanden, meist sechs oder sieben Walzgerüste 9. Aus Gründen der Übersichtlichkeit sind in FIG 1 lediglich das erste Walzgerüst 9 und das letzte Walzgerüst 9 dargestellt. In den Walzgerüsten 9 der Fertigstraße 8 wird das Metallband 1 nach dem Kühlen in der Kühleinrichtung 3 fertig gewalzt.The rolling mill also has a finishing train 8. The finishing train 8 has a plurality of rolling stands 9. The number of rolling stands 9 can be as needed. As a rule, five to eight rolling stands 9 are present, usually six or seven rolling stands 9. For reasons of clarity, in FIG. 1 only the first roll stand 9 and the last stand 9 shown. In the rolling stands 9 of the finishing train 8, the metal strip 1 is finished rolled after cooling in the cooling device 3.

In der Regel ist dem letzten Walzgerüst 9 der Fertigstraße 8 ein Temperaturmessplatz 10 nachgeordnet. Am Temperaturmessplatz 10 wird die Oberflächentemperatur TO des fertig gewalzten Metallbandes 1 messtechnisch erfasst.As a rule, the last rolling mill 9 of the finishing train 8 is followed by a temperature measuring station 10. At the temperature measuring station 10, the surface temperature TO of the finished rolled metal strip 1 is detected metrologically.

Oftmals ist der Fertigstraße 8 weiterhin eine Kühlstrecke 11 nachgeordnet, in der das fertig gewalzte Metallband 1 einem definierten Kühlverlauf unterzogen wird. Die Kühlstrecke 11 weist zu diesem Zweck eine Vielzahl weiterer Kühleinrichtungen 12 auf, die individuell oder gruppenweise ansteuerbar sind. In FIG 1 sind aus Gründen der Übersichtlichkeit nur einige wenige der weiteren Kühleinrichtungen 12 dargestellt.Often the finishing train 8 is further downstream of a cooling section 11, in which the finished rolled metal strip 1 is subjected to a defined cooling process. The cooling section 11 has for this purpose a plurality of further cooling devices 12, which can be controlled individually or in groups. In FIG. 1 For reasons of clarity, only a few of the further cooling devices 12 are shown.

Schließlich ist der Fertigstraße 8 in der Regel eine Haspelanordnung 13 nachgeordnet. Die Haspelanordnung 13 weist mindestens einen Haspel 14 auf, mittels dessen das Metallband 1 zu einem Bund 15 gehaspelt wird. Falls die Kühlstrecke 11 vorhanden ist, ist die Haspeleinrichtung 13 der Kühlstrecke 11 nachgeordnet. Die Kühlstrecke 11 befindet sich also in diesem Fall zwischen der Fertigstraße 8 und der Haspelanordnung 13.Finally, the finishing train 8 is usually followed by a reel assembly 13. The reel assembly 13 has at least one reel 14, by means of which the metal strip 1 is reeled to a collar 15. If the cooling section 11 is present, the reel device 13 of the cooling section 11 is arranged downstream. The cooling section 11 is thus located in This case between the finishing train 8 and the reel assembly 13th

Das Walzwerk 2 wird von einem Steuerrechner 16 gesteuert. Der Steuerrechner 16 ist mit einem Computerprogramm 17 programmiert. Das Computerprogramm 17 umfasst Maschinencode 18, der von dem Steuerrechner 16 unmittelbar abarbeitbar ist. Die Abarbeitung des Maschinencodes 18 durch den Steuerrechner 16 bewirkt, dass der Steuerrechner 16 das Walzwerk gemäß einem Herstellungsverfahren steuert. Insbesondere steuert der Steuerrechner 16 das Vorwalzwerk 2, die Kühleinrichtung 3 und die Fertigstraße 8. Gegebenenfalls kann der Steuerrechner 16 auch weitere Komponenten des Walzwerks steuern, beispielsweise einen dem Vorwalzwerk 2 vorgeordneten Ofen 19 oder die Kühlstrecke 11 und gegebenenfalls auch die Haspelanordnung 13. Das Herstellungsverfahren wird nachfolgend in Verbindung mit FIG 4 näher erläutert. Ergänzend wird in diesem Zusammenhang auch auf die FIG 1, 5 und 6 verwiesen.The rolling mill 2 is controlled by a control computer 16. The control computer 16 is programmed with a computer program 17. The computer program 17 includes machine code 18 which can be processed directly by the control computer 16. The processing of the machine code 18 by the control computer 16 causes the control computer 16 to control the rolling mill according to a manufacturing process. Optionally, the control computer 16 may also control other components of the rolling mill, for example, a pre-rolling 2 upstream furnace 19 or the cooling section 11 and optionally also the reel assembly 13. The manufacturing process will be described below in connection with FIG. 4 explained in more detail. In addition, in this context, on the FIG. 1 . 5 and 6 directed.

Der Steuerrechner 16 kann ein einzelner Steuerrechner sein. Es ist aber auch möglich, dass der Steuerrechner 16 aus mehreren, datentechnisch miteinander verbundenen Einzelrechnern besteht, von denen jeder nur eine oder mehrere bestimmte Teilaufgaben übernimmt. Beispielsweise kann der Steuerrechner 16 aus einem Einzelrechner für die Ansteuerung der Aggregate, einem Einzelrechner zur Ausführung von Rechenoperationen wie Modellberechnungen und einem Einzelrechner zur Entgegennahme von Bedienereingaben und Anzeige von Ergebnissen bestehen. Auch eine andere oder zusätzliche Aufteilung, beispielsweise hinsichtlich Steuerung von Anlagenteilen ist möglich. Beispielsweise kann der Steuerrechner 16 alternativ oder zusätzlich in je einen Einzelrechner zur Steuerung des Walzgerüstes 2, der Kühleinrichtung 3 und der Fertigstraße 8 aufgeteilt sein.The control computer 16 may be a single control computer. But it is also possible that the control computer 16 consists of several, data-technically interconnected individual computers, each of which takes on only one or more specific subtasks. For example, the control computer 16 may consist of a single computer for the control of the aggregates, a single computer for the execution of arithmetic operations such as model calculations and a single computer for receiving operator inputs and displaying results. Another or additional distribution, for example with regard to the control of system components is possible. For example, the control computer 16 may alternatively or additionally be divided into a respective individual computer for controlling the rolling stand 2, the cooling device 3 and the finishing train 8.

Aufgrund der Abarbeitung des Maschinencodes 18 implementiert der Steuerrechner 16 gemäß FIG 4 in einem Schritt S1 zunächst ein Walzmodell 20 (siehe FIG 1). Das Walzmodell 20 kann beispielsweise auf mathematisch-physikalischen Gleichungen basieren. Die Gleichungen können insbesondere algebraische Gleichungen und/oder Differentialgleichungen sein. Das Walzmodell 20 ermittelt anhand von Eingangsdaten des Metallbandes 1 in Verbindung mit Einflüssen, denen das Metallband 1 ausgesetzt ist, das sich ergebende Walzgut, insbesondere dessen erwartete Temperatur und/oder eine erwartete Materialfestigkeit wie die Zugfestigkeit, die Dehngrenze, die Streckgrenze und dergleichen mehr. Die Eingangsdaten des Metallbandes 1 sind beispielsweise dessen chemische Zusammensetzung, dessen Dicke und dessen Temperatur. Die Einflüsse, die auf das Metallband 1 ausgeübt werden, sind beispielsweise die einzelnen Walzvorgänge im Vorwalzwerk 2 und in den Walzgerüsten 9 der Fertigstraße 8 sowie die Kühlung in der Kühleinrichtung 3.Due to the execution of the machine code 18, the control computer 16 implements according to FIG. 4 in a step S1 first a rolling model 20 (see FIG. 1 ). The rolling model 20 may be, for example based on mathematical-physical equations. The equations may in particular be algebraic equations and / or differential equations. The rolling model 20 determines, based on input data of the metal strip 1 in conjunction with influences to which the metal strip 1 is exposed, the resulting rolling stock, in particular its expected temperature and / or expected material strength such as tensile strength, yield strength, yield strength and the like. The input data of the metal strip 1 are, for example, its chemical composition, its thickness and its temperature. The influences that are exerted on the metal strip 1, for example, the individual rolling operations in the roughing mill 2 and in the rolling stands 9 of the finishing train 8 and the cooling in the cooling device. 3

In einem Schritt S2 wird das Metallband 1 im Vorwalzwerk 2 vorgewalzt. Das Vorwalzen erfolgt unter Kontrolle des Steuerrechners 16.In a step S2, the metal strip 1 is pre-rolled in the roughing mill 2. The rough rolling takes place under the control of the control computer 16.

Der Steuerrechner 16 erfasst in einem Schritt S3 Anfangswerte einer ersten Eigenschaft des Metallbandes 1. Der Steuerrechner 16 erfasst die Anfangswerte in Bandbreitenrichtung ortsaufgelöst. Minimal werden somit zwei Werte erfasst, nämlich für die linke und die rechte Seite des Metallbandes 1 oder für die Mitte und den seitlichen Außenbereich des Metallbandes 1. Es ist auch eine Erfassung von mehr als zwei Werten möglich. Die Erfassung der Anfangswerte erfolgt spätestens zu dem Zeitpunkt, zu dem das Metallband 1 in die Kühleinrichtung 11 eintritt. Sie kann auch eher erfolgen, beispielsweise beim Vorwalzen oder vor dem Vorwalzen.The control computer 16 detects initial values of a first property of the metal strip 1 in a step S3. The control computer 16 detects the initial values in the bandwidth direction with spatial resolution. Thus, at least two values are detected, namely for the left and the right side of the metal strip 1 or for the center and the lateral outer area of the metal strip 1. It is also possible to detect more than two values. The detection of the initial values takes place at the latest at the time when the metal strip 1 enters the cooling device 11. It can also be done sooner, for example during roughing or before rough rolling.

Die Anfangswerte als solche können nach Bedarf bestimmt sein. Beispielsweise kann es sich bei den Anfangswerten - siehe FIG 5 - um die Temperatur T des Metallbandes 1 als Funktion über die Banddicke d (d. h. um die Temperatur als Funktion des Ortes in Banddickenrichtung) handeln. Diese Anfangswerte werden in der Regel vor dem Vorwalzen erfasst. Alternativ kann es sich - siehe FIG 6 - zusätzlich zur Temperatur T als Funktion über die Banddicke d um die Banddicke d des in das Vorwalzwerk 2 einlaufenden Metallbandes 1 und um die beim Vorwalzen auftretenden Walzkräfte FV handeln. Diese Werte werden - zumindest teilweise - beim Vorwalzen des Metallbandes 1 erfasst. Falls die Banddicke d und die Walzkräfte FV beim Vorwalzen erfasst werden, werden auch diese Werte in Bandbreitenrichtung ortsaufgelöst erfasst.The initial values as such may be determined as needed. For example, it may be at the initial values - see FIG. 5 the temperature T of the metal strip 1 as a function of the strip thickness d (ie the temperature as a function of the location in the strip thickness direction). These initial values are usually recorded before roughing. Alternatively, it can - see FIG. 6 - in addition to the temperature T as Function on the strip thickness d to the strip thickness d of the incoming in the roughing mill 2 metal strip 1 and the rolling forces occurring during roughing FV act. These values are detected - at least partially - during rough rolling of the metal strip 1. If the strip thickness d and the rolling forces FV during pre-rolling are detected, these values are also detected spatially resolved in the bandwidth direction.

Aus den obigen Ausführungen ist ersichtlich, dass der Schritt S2 - je nach Ausgestaltung des Herstellungsverfahrens - vor dem Schritt S3 ausgeführt werden kann. Alternativ kann der Schritt S2 simultan mit dem Schritt S3 oder nach dem Schritt S3 ausgeführt werden. Auch Mischformen können sinnvoll sein.From the above explanations, it can be seen that step S2-depending on the configuration of the production method-can be carried out before step S3. Alternatively, the step S2 may be executed simultaneously with the step S3 or after the step S3. Mixed forms can also make sense.

Der Steuerrechner 16 führt die erfassten Anfangswerte in einem Schritt S4 dem Walzmodell 20 zu. Der Steuerrechner 16 führt dem Walzmodell 20 im Schritt S4 weiterhin Stichplandaten der Fertigstraße 8 zu. Die Stichplandaten umfassen Sollwalzspalte, Sollstichabnahmen, erwartete Walzkräfte, bei den Walzvorgängen vor und/oder hinter dem entsprechenden Walzgerüst 9 auftretende Züge und dergleichen mehr. Die Stichplandaten können alternativ über die Bandbreite einheitlich oder über die Bandbreite ortsaufgelöst sein. Im Falle der Ortsauflösung können die Stichplandaten alternativ symmetrisch, antisymmetrisch oder asymmetrisch sein. Schließlich setzt der Steuerrechner 16 in einem Schritt S5 Ansteuerwerte S für die Kühleinrichtung 3 an. Die Ansteuerwerte S sind in Bandbreitenrichtung aufgelöst.The control computer 16 supplies the detected initial values to the rolling model 20 in a step S4. The control computer 16 continues to feed the finishing pattern 8 to the rolling pattern 20 in step S4. The keyway data include Sollwalzspalte, Sollstichabnahmen, expected rolling forces, in the rolling operations before and / or behind the corresponding rolling stand 9 occurring trains and the like. The stitch plan data may alternatively be spatially resolved over the bandwidth, uniformly or across the bandwidth. In the case of spatial resolution, the stitch plan data may alternatively be symmetric, antisymmetric or asymmetric. Finally, the control computer 16 sets activation values S for the cooling device 3 in a step S5. The drive values S are resolved in the bandwidth direction.

Anhand der genannten Werte ermittelt der Steuerrechner 16 mittels des Walzmodells 20 in einem Schritt S6 Erwartungswerte für eine zweite Eigenschaft des Metallbandes 1. Die ermittelten Erwartungswerte hängen also - zumindest unter anderem - von den in Bandbreitenrichtung örtlich korrespondierenden Anfangswerten und den in Bandbreitenrichtung örtlich korrespondierenden Ansteuerwerten S der Kühleinrichtung 3 ab. Der Steuerrechner 16 ermittelt die Erwartungswerte für einen Ort, der beim ersten Walzgerüst 9 der Fertigstraße 8 oder dahinter liegt, beispielsweise für den Ort des ersten, zweiten usw. Walzgerüsts 9 der Fertigstraße 8 oder für einen Ort hinter der Fertigstraße 8, d. h. hinter dem letzten Walzgerüst 9 der Fertigstraße 8. Beispielsweise kann der entsprechende Ort der Ort des Temperaturmessplatzes 10 sein.On the basis of the values mentioned, the control computer 16 determines expected values for a second property of the metal strip 1 in a step S6 by means of the rolling model 20. The determined expected values depend, at least inter alia, on the initial values locally corresponding in the bandwidth direction and the drive values S locally locally corresponding in the bandwidth direction the cooling device 3 from. The control computer 16 determines the expected values for a location at the first rolling stand 9 of the finishing train 8 or behind For example, for the location of the first, second, etc. rolling stand 9 of the finishing train 8 or for a place behind the finishing train 8, ie behind the last rolling stand 9 of the finishing train 8. For example, the corresponding location of the location of the temperature measuring station 10 may be.

Der Steuerrechner 16 ermittelt die Erwartungswerte in Bandbreitenrichtung ortsaufgelöst. Beispielsweise kann der Steuerrechner 16 als zweite Eigenschaft die Temperatur T des Metallbandes 1 oder eine mechanische Eigenschaft des Metallbandes 1 - beispielsweise eine Materialfestigkeit - ermitteln. Falls der Steuerrechner 16 die Temperatur T ermittelt, ermittelt er sie in der Regel für den Ort des Temperaturmessplatzes 10. Falls der Steuerrechner 16 mechanische Eigenschaften ermittelt, ermittelt er sie in der Regel für den Ort eines der Walzgerüste 9 der Fertigstraße 8 oder für die Orte mehrerer Walzgerüste 9 der Fertigstraße 8.The control computer 16 determines the expected values in the bandwidth direction with spatial resolution. For example, the control computer 16 as a second property, the temperature T of the metal strip 1 or a mechanical property of the metal strip 1 - for example, a material strength - determine. If the control computer 16 determines the temperature T, it usually determines it for the location of the temperature measuring station 10. If the control computer 16 determines mechanical properties, it usually determines them for the location of one of the rolling stands 9 of the finishing train 8 or for the locations several rolling stands 9 of the finishing train 8.

Der Steuerrechner 16 vergleicht die ermittelten Erwartungswerte in einem Schritt S7 mit Sollwerten der zweiten Eigenschaften des Metallbandes 1. Die Sollwerte können über die Bandbreite gesehen einheitlich sein. Alternativ können sie über die Bandbreite gesehen variieren, also ortsaufgelöst sein. Unabhängig davon, ob die Sollwerte über die Bandbreite variieren oder nicht, führt der Steuerrechner 16 den Vergleich jedoch in Bandbreitenrichtung ortsaufgelöst durch. Entsprechend dem Ergebnis des Vergleichs variiert der Steuerrechner 16 in einem Schritt S8 die Ansteuerwerte S. Der Steuerrechner 16 führt die Variierung derart durch, dass die Erwartungswerte - in Bandbreitenrichtung ortsaufgelöst - den Sollwerten angenähert werden.The control computer 16 compares the determined expected values in a step S7 with nominal values of the second properties of the metal strip 1. The nominal values can be uniform across the bandwidth. Alternatively, they can vary across the bandwidth seen, so be spatially resolved. Regardless of whether the setpoint values vary over the bandwidth or not, the control computer 16 carries out the comparison, however, in a spatially resolved manner in the bandwidth direction. In accordance with the result of the comparison, the control computer 16 varies the activation values S in a step S8. The control computer 16 carries out the variation in such a way that the expected values-spatially resolved in the bandwidth direction-are approximated to the desired values.

Es ist möglich, dass der Steuerrechner 16 die Ansteuerwerte S sofort derart ansetzen kann, dass die Erwartungswerte den Sollwerten soweit wie möglich angenähert werden. Alternativ ist es möglich, dass die Schritte S6, S7 und S8 iterativ durchlaufen werden.It is possible for the control computer 16 to immediately set the activation values S in such a way that the expected values are brought as close as possible to the desired values. Alternatively, it is possible that the steps S6, S7 and S8 are iterated.

Nach dem Ermitteln der Ansteuerwerte S steuert der Steuerrechner 16 in einem Schritt S9 die Kühleinrichtung 3 entsprechend den ermittelten Ansteuerwerten S an.After determining the activation values S, the control computer 16 controls the cooling device 3 in a step S9 in accordance with the determined activation values S.

In einer bevorzugten Ausgestaltung erfasst der Steuerrechner 16 gemäß FIG 4 in einem Schritt S10 an dem Ort, für den er die Erwartungswerte der zweiten Eigenschaft ermittelt hat, Istwerte einer dritten Eigenschaft des Metallbandes 1. Beispielsweise kann der Steuerrechner 16 gemäß FIG 5 am Temperaturmessplatz 10 die Temperatur TO des Metallbandes 1 an seiner Oberfläche erfassen. Alternativ oder zusätzlich kann der Steuerrechner 16 gemäß FIG 6 beim Fertigwalzen die vor und/oder hinter den Walzgerüsten 9 der Fertigstraße 8 auftretenden Züge Z, die in den Walzgerüsten 9 der Fertigstraße 3 auftretenden Walzkräfte F und die in den Walzgerüsten 9 der Fertigstraße 8 auftretenden Anstellungen s erfassen.In a preferred embodiment, the control computer 16 detects according to FIG. 4 in a step S10 at the location for which he has determined the expected values of the second property, actual values of a third property of the metal strip 1. For example, the control computer 16 according to FIG. 5 at the temperature measuring station 10, the temperature TO of the metal strip 1 on its surface detect. Alternatively or additionally, the control computer 16 according to FIG. 6 during finish rolling, the trains Z occurring in front of and / or behind the rolling stands 9 of the finishing train 8 detect the rolling forces F occurring in the rolling stands 9 of the finishing train 3 and the jobs occurring in the rolling stands 9 of the finishing train 8.

Die Istwerte der erfassten dritten Eigenschaft hängen von Istwerten der zweiten Eigenschaft ab. Beispielsweise hängt die Temperatur TO des Metallbandes 1 an seiner Oberfläche ersichtlich von der Temperatur T des Metallbandes 1 ab. Auch hängen die Walzkräfte F beispielsweise von der Materialverfestigung und von der Temperatur T ab. Es ist daher möglich, dass der Steuerrechner 16 in einem Schritt S11 das Walzmodell 20 anhand eines Vergleichs adaptiert, wobei in den Vergleich die Erwartungswerte der zweiten Eigenschaft und die Istwerte der dritten Eigenschaft eingehen. Es ist möglich, zum Zwecke der Vergleichbarkeit anhand der Erwartungswerte der zweiten Eigenschaft korrespondierende Erwartungswerte der dritten Eigenschaft zu ermitteln und den Vergleich auf der Ebene der dritten Eigenschaft vorzunehmen. Alternativ ist es möglich, anhand der Istwerte der dritten Eigenschaft die korrespondierenden Istwerte der zweiten Eigenschaft zu ermitteln und den Vergleich auf der Ebene der zweiten Eigenschaft vorzunehmen.The actual values of the detected third property depend on actual values of the second property. For example, the temperature TO of the metal strip 1 on its surface obviously depends on the temperature T of the metal strip 1. Also, the rolling forces F depend, for example, on the material hardening and on the temperature T. It is therefore possible for the control computer 16, in a step S11, to adapt the rolling model 20 on the basis of a comparison, the expectation values of the second property and the actual values of the third property being included in the comparison. It is possible, for the purpose of comparability on the basis of the expectation values of the second property, to determine corresponding expectation values of the third property and to make the comparison on the level of the third property. Alternatively, it is possible to determine the corresponding actual values of the second property from the actual values of the third property and to make the comparison at the level of the second property.

Die Adaptierung des Walzmodells 20 kann nach Bedarf ausgestaltet sein. Insbesondere ist es möglich, dass die Temperatur T als Funktion der Banddicke d im Rahmen des Walzmodells 20 ermittelt wird. In diesem Fall kann die Ermittlungsvorschrift für das Ermitteln der Temperatur T als Funktion der Banddicke d adaptiert werden. Unabhängig davon, wie die Adaption exakt realisiert ist, erfolgt die Adaption jedoch in Bandbreitenrichtung ortsaufgelöst.The adaptation of the rolling model 20 can be configured as needed. In particular, it is possible that the temperature T as a function of the strip thickness d in the context of the rolling model 20 is determined. In this case, the determination rule for determining the temperature T as a function of the strip thickness d can be adapted. Regardless of how the adaptation is exactly realized, however, the adaptation is spatially resolved in the bandwidth direction.

In einigen Ausgestaltungen der vorliegenden Erfindung ist es ausreichend, die Anfangswerte in Längsrichtung des Metallbandes 1 gesehen ohne Ortsauflösung zu erfassen. In diesen Fällen ist es in der Regel auch ausreichend, die Erwartungswerte in Längsrichtung des Metallbandes 1 gesehen nur einmal zu ermitteln und auch die Adaption gegebenenfalls nur einmal pro Metallband 1 durchzuführen. In anderen Ausgestaltungen der vorliegenden Erfindung ist es jedoch erforderlich, gemäß FIG 7 die Anfangswerte jeweils für einen Bandpunkt 21 des Metallbandes 1 zu erfassen. Ein Bandpunkt 21 kann in diesem Fall beispielsweise mit einem bestimmten Zeitmaß korrespondieren. Beispielsweise kann mit einem Arbeitstakt von ca. 0,2 bis ca. 0,5 s jeweils die Erfassung der Anfangswerte erfolgen. In diesem Fall entspricht jeder Bandpunkt 21 einem Abschnitt des Metallbandes 1, der durch die jeweilige Transportgeschwindigkeit v des Metallbandes 1 zum Erfassungszeitpunkt und den Arbeitstakt definiert ist. Alternativ können die Bandpunkte 21 mit Abschnitten des Metallbandes 1 vordefinierter Länge korrespondieren, beispielsweise einer Länge von 10, 15, 20, ... cm. Alternativ können die Bandpunkte 21 mit einer vordefinierten Masse korrespondieren, beispielsweise 20, 30, 50, ... 100 kg.In some embodiments of the present invention, it is sufficient to detect the initial values in the longitudinal direction of the metal strip 1 without spatial resolution. In these cases, as a rule, it is also sufficient to determine the expected values in the longitudinal direction of the metal strip 1 only once and, if appropriate, to carry out the adaptation only once per metal strip 1. In other embodiments of the present invention, however, it is necessary, according to FIG. 7 to detect the initial values respectively for a band point 21 of the metal strip 1. A band point 21 may in this case correspond, for example, to a specific time measurement. For example, with a working cycle of approximately 0.2 to approximately 0.5 s, the detection of the initial values can take place in each case. In this case, each band point 21 corresponds to a portion of the metal band 1 defined by the respective transport speed v of the metal band 1 at the detection time and the power stroke. Alternatively, the band points 21 may correspond to portions of the metal band 1 of predefined length, for example, a length of 10, 15, 20,... Cm. Alternatively, the band points 21 may correspond to a predefined mass, for example 20, 30, 50, ... 100 kg.

Wenn die Anfangswerte für die einzelnen Bandpunkte 21 erfasst werden, erfolgt auch die Ermittlung der Erwartungswerte individuell für den jeweiligen Bandpunkt 21. Weiterhin werden die Bandpunkte 21 in diesem Fall auf ihrem Weg vom Vorwalzwerk 2 durch die Kühleinrichtung 3 und die Walzgerüste 9 der Fertigstraße 8 wegverfolgt. Die Kühleinrichtung 3 wird jeweils zum Zeitpunkt des Durchlaufens des jeweiligen Bandpunktes 21 mit dem für den jeweiligen Bandpunkt 21 ermittelten Ansteuerwerten S angesteuert. Die Implementierung einer Wegverfolgung einschließlich der zeitrichtigen Ansteuerung der einzelnen Einrichtungen 2, 3, 9 des Walzwerks ist Fachleuten allgemein bekannt.If the initial values for the individual belt points 21 are detected, the determination of the expected values also takes place individually for the respective belt point 21. In this case, the belt points 21 are tracked on their way from the roughing mill 2 through the cooling device 3 and the rolling stands 9 of the finishing train 8 , The cooling device 3 is controlled in each case at the time of passing through the respective band point 21 with the control values S determined for the respective band point 21. The implementation of a tracking including the timely control of the individual devices 2, 3, 9 of the rolling mill is well known to those skilled in the art.

Auch die Ansteuerung der Walzgerüste 9 der Fertigstraße 8 erfolgt in diesem Fall individuell für den jeweiligen Bandpunkt 21. Falls Istwerte mindestens einer dritten Eigenschaft des Metallbandes 1 erfasst werden, erfolgt auch diese Erfassung entsprechend der Wegverfolgung für den jeweiligen Bandpunkt 21. Dies gilt unabhängig davon, ob als Istwerte der dritten Eigenschaft die Oberflächentemperatur TO, die Walzkräfte F, die Walzgerüstanstellungen s, die Züge Z usw. erfasst werden.The control of the rolling stands 9 of the finishing train 8 is done in this case individually for the respective band point 21. If actual values of at least one third property of the metal strip 1 are detected, this detection also takes place according to the tracking for the respective band point 21. This applies regardless of whether the surface temperature TO, the rolling forces F, the rolling stand positions s, the trains Z, etc. are detected as actual values of the third property.

Wie bereits erwähnt, können dem Ort, für den die Erwartungswerte ermittelt werden, weitere Kühleinrichtungen 12 nachgeordnet sein. Falls mindestens eine der weiteren Kühleinrichtungen 12 in Bandbreitenrichtung ortsaufgelöst ansteuerbar ist, kann diese Ansteuerung derart erfolgen, dass die Erwartungswerte der zweiten Eigenschaften in Bandbreitenrichtung gesehen einander angenähert werden. Diese Ausgestaltung ist unabhängig davon realisierbar, was die zweite Eigenschaft des Metallbandes 1 ist.As already mentioned, further cooling devices 12 can be arranged downstream of the location for which the expected values are determined. If at least one of the further cooling devices 12 can be controlled in a spatially resolved manner in the bandwidth direction, this activation can be carried out in such a way that the expected values of the second properties in the bandwidth direction are approximated to one another. This embodiment can be realized independently of what the second property of the metal strip 1 is.

Weiterhin kann an dem Ort, für den die Erwartungswerte ermittelt werden oder hinter diesem Ort in Bandbreitenrichtung ortsaufgelöst die Temperatur TO des Metallbandes 1 erfasst werden. Beispielsweise kann der Temperaturmessplatz 10 unabhängig davon vorhanden sein, ob als zweite Eigenschaft die Temperatur T des Metallbandes 1 oder dessen Materialfestigkeit herangezogen wird. Im erstgenannten Fall erfolgt die Temperaturerfassung in der Regel an dem Ort, für den die Erwartungswerte ermittelt werden. Im letztgenannten Fall erfolgt die Temperaturerfassung hinter dem Ort, für den die Erwartungswerte ermittelt werden. Denn in diesem Fall werden die Erwartungswerte in der Regel für den Ort mindestens eines Walzgerüsts 9 der Fertigstraße 8 ermittelt, also vor dem Temperaturmessplatz 10.Furthermore, the temperature TO of the metal strip 1 can be detected spatially resolved at the location for which the expected values are determined or behind this location in the bandwidth direction. For example, the temperature measuring station 10 may be present regardless of whether the temperature T of the metal strip 1 or its material strength is used as a second property. In the former case, the temperature detection usually takes place at the location for which the expected values are determined. In the latter case, the temperature detection takes place behind the location for which the expected values are determined. Because in this case, the expected values are generally determined for the location of at least one rolling stand 9 of the finishing train 8, ie before the temperature measuring station 10.

Auch in diesem Fall ist es möglich, dass mindestens eine der weiteren Kühleinrichtungen 12, also eine Kühleinrichtung 12 der Kühlstrecke 11, in Bandbreitenrichtung ortsaufgelöst ansteuerbar ist. In diesem Fall kann die Ansteuerung der entsprechenden Kühleinrichtung 12 derart erfolgen, dass die Temperatur T des Metallbandes 1 in Bandbreitenrichtung gesehen angeglichen wird.In this case, too, it is possible for at least one of the further cooling devices 12, that is to say a cooling device 12 of the cooling section 11, to be controlled in a spatially resolved manner in the bandwidth direction. In this case, the activation of the corresponding cooling device 12 can take place in such a way that the temperature T of the metal strip 1 is adjusted in the direction of the strip width.

Die vorliegende Erfindung weist viele Vorteile auf. Insbesondere kann mittels der breitenabhängigen Kühlung des Metallbandes 1 vor dem Fertigwalzen eine Vergleichmäßigung von Materialeigenschaften erreicht werden.The present invention has many advantages. In particular, homogenization of material properties can be achieved by means of the width-dependent cooling of the metal strip 1 before the finish rolling.

Obwohl die Erfindung im Detail durch das bevorzugte Ausführungsbeispiel näher illustriert und beschrieben wurde, so ist die Erfindung nicht durch die offenbarten Beispiele eingeschränkt und andere Varianten können vom Fachmann hieraus abgeleitet werden, ohne den durch die Ansprüche definierten Schutzumfang der Erfindung zu verlassen. Although the invention has been further illustrated and described in detail by the preferred embodiment, the invention is not limited by the disclosed examples, and other variants can be derived therefrom by those skilled in the art without departing from the scope of the invention as defined by the claims.

Claims (14)

  1. Manufacturing method for a metal strip (1),
    - wherein the metal strip (1) is roughed in a roughing mill (2), then cooled in a cooling device (3) and finally finish-rolled in a finishing train (8) with multiple rolling stands (9), characterised in that
    - at the latest on entry of the metal strip (1) into the cooling device (3), initial values of a first property of the metal strip (1) are recorded in a spatially resolved form in the direction of the width of the strip,
    - the recorded initial values are fed to a rolling model (20),
    - by means of the rolling model (20) for a location which lies at or behind the first rolling stand (9) of the finishing train (8), expected values of a second property of the metal strip (1) are determined in a spatially resolved form in the direction of the width of the strip,
    - the expected values depend on the respective initial values and on respective activation values (S) of the cooling device (3),
    - the activation values (S) of the cooling device (3) are determined by means of the rolling model (20) in a spatially resolved form in the direction of the width of the strip such that the expected values in a spatially resolved form in the direction of the width of the strip are approximated to desired values of the second property,
    - the cooling device (3) is activated in accordance with the determined activation values (S).
  2. Manufacturing method according to claim 1,
    characterised in that the first property of the metal strip (1) is the temperature (T) of the metal strip as a function over the strip depth (d).
  3. Manufacturing method according to claim 1 or 2,
    characterised in that the initial values are recorded in each case for a strip point (21) of the metal strip (1), that the activation values (S) of the cooling device (3) are determined for the respective strip point (21), that the strip points (21) are traced on their way from the roughing mill (2) through the cooling device (3) and the rolling stands (9) of the finishing train (8) and that the cooling device (3), at the point in time at which the respective strip point (21) passes through it, is activated with the activation values (S) determined for the respective strip point (21).
  4. Manufacturing method according to claim 1, 2 or 3,
    characterised in that, at the location for which the expected values are determined, actual values of a least one third property of the metal strip (1) are recorded in a spatially resolved form in the direction of the width of the strip, that the actual values of the third property depend on actual values of the second property and that the rolling model (20) is adapted on the basis of a comparison in a spatially resolved form in the direction of the width of the strip, in which the expected values of the second property and the actual values of the third property are included.
  5. Manufacturing method according to claim 4,
    characterised in that the third property of the metal strip (1) comprises the temperature (TO) of the metal strip (1) on its surface and/or its depth (d).
  6. Manufacturing method according to claim 1, 2, 3 and 4, characterised in that,
    - for the strip points (21), in addition to the initial values of the first property, the depth (d) of the metal strip (1) entering the roughing mill (2) and the rolling forces (FV) occurring during roughing are recorded in a spatially resolved form in the direction of the width of the strip,
    - the third properties for the strip points (21) are recorded in each case during rolling of the respective strip point (21) in the respective rolling stand (9) of the finishing train (8),
    - the third properties include tensions (Z) occurring during finishing of the strip points (21) before and/or after the rolling stands (9) of the rolling mill (8), rolling forces (F) occurring in the rolling stands (9) of the finishing train (8) and settings (s) made in the rolling stands (9) of the rolling mill (8).
  7. Manufacturing method according to claim 6,
    characterised in that the second property of the metal strip (1) is the material solidity.
  8. Manufacturing method according to one of claims 1 to 6,
    characterised in that the second property is the temperature (T) of the metal strip (1).
  9. Manufacturing method according to one of claims 1 to 8,
    characterised in that at least one further cooling device (12) is located after the location for which the expected values are determined and that the further cooling device (12) is activated in a spatially resolved form in the direction of the width of the strip such that the expected values of the second property of the metal strip (1), viewed in the direction of the width of the strip, are adapted to one another.
  10. Manufacturing method according to one of claims 1 to 8, characterised in that, at the location for which the expected values are determined, or behind this location, the temperature (TO) of the metal strip (1) is recorded in a spatially resolved form in the direction of the width of the strip, that a least one further cooling device (12) is located downstream from the location at which the temperature (TO) of the metal strip (1) is recorded in a spatially resolved form in the direction of the width of the strip and that the at least one further cooling device (12) is activated in a spatially resolved form in the direction of the width of the strip such that the temperatures (T) of the metal strip (1), viewed in the direction of the width of the strip, are adapted to one another.
  11. Manufacturing method according to one of the above claims, characterised in that the location for which the expected values are determined lies behind the last rolling stand (9) of the finishing train (8).
  12. Computer program comprising machine code (18), which is able to be processed directly by a control computer (16) for a rolling mill for rolling a metal strip (1) and the processing of which by the control computer (16) has the effect that the control computer (16) operates the rolling mill in accordance with a manufacturing method with all steps of a manufacturing method according to one of the above claims.
  13. Control computer for a rolling mill for rolling a metal strip (1), characterised in that the control computer is programmed such that it operates the rolling mill in accordance with a manufacturing method with all steps of a manufacturing method according to one of claims 1 to 11.
  14. Rolling mill for rolling a metal strip (1),
    - wherein the rolling mill has a roughing mill (2) in which the metal strip (1) is roughed,
    - wherein the rolling mill has a cooling device (3) in which the metal strip (1) is cooled after roughing,
    - wherein the rolling mill has a finishing train (8) with multiple rolling stands (9) in which the metal strip (1) is finish-rolled after cooling, characterised in that
    - the rolling mill has a control computer (16), by which, on entry of the metal strip (1) into the cooling device (3) at the latest, initial values of a first property of the metal strip (1) are recorded in a spatially resolved form in the direction of the width of the strip,
    - the control computer (16) implements a rolling model (20) to which the recorded initial values are supplied,
    - the control computer (16) determines by means of the rolling model (20) for a location, which lies at or behind the first rolling stand (9) of the finishing train (8), expected values of a second property of the metal strip (1) in a spatially resolved form in the direction of the width of the strip,
    - the expected values depend on the respective initial values and on respective activation values (S) of the cooling device (3),
    - the control computer (16) determines the activation values (S) of the cooling device (3) by means of the rolling model (20) in a spatially resolved form in the direction of the width of the strip such that the expected values, in a spatially resolved form in the direction of the width of the strip, are made to approximate to desired values of the second property,
    - the control computer (16) controls the cooling device (3) according to the determined activation values (S).
EP13718316.6A 2012-04-27 2013-04-17 Equalisation of belt properties by means of width-dependent preliminary belt cooling Active EP2841215B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13718316.6A EP2841215B1 (en) 2012-04-27 2013-04-17 Equalisation of belt properties by means of width-dependent preliminary belt cooling

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP12165879 2012-04-27
PCT/EP2013/057973 WO2013160166A1 (en) 2012-04-27 2013-04-17 Equalization of strip properties by width-dependent roughed-strip cooling
EP13718316.6A EP2841215B1 (en) 2012-04-27 2013-04-17 Equalisation of belt properties by means of width-dependent preliminary belt cooling

Publications (2)

Publication Number Publication Date
EP2841215A1 EP2841215A1 (en) 2015-03-04
EP2841215B1 true EP2841215B1 (en) 2016-05-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP13718316.6A Active EP2841215B1 (en) 2012-04-27 2013-04-17 Equalisation of belt properties by means of width-dependent preliminary belt cooling

Country Status (3)

Country Link
EP (1) EP2841215B1 (en)
CN (1) CN104254408B (en)
WO (1) WO2013160166A1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19963186A1 (en) 1999-12-27 2001-07-12 Siemens Ag Method for controlling and / or regulating the cooling section of a hot strip mill for rolling metal strip and associated device
WO2003045599A1 (en) 2001-11-15 2003-06-05 Siemens Aktiengesellschaft Control method for a production line for rolling hot-rolled metal strips disposed upstream of a cooling stretch
JP2008238241A (en) 2007-03-28 2008-10-09 Kobe Steel Ltd Manufacturing method of aluminum metal sheet
DE102007053523A1 (en) 2007-05-30 2008-12-04 Sms Demag Ag Device for influencing temperature distribution over width of slab or strip, particularly in one or multiple hot strip mill, has cooling device, which is provided with nozzles for applying cooling agent on slab or strip
EP2280323A1 (en) 2009-07-08 2011-02-02 Siemens Aktiengesellschaft Control method for a device that affects a milling product
JP2012040593A (en) 2010-08-20 2012-03-01 Jfe Steel Corp Device for controlling finishing temperature in hot rolling

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19963186A1 (en) 1999-12-27 2001-07-12 Siemens Ag Method for controlling and / or regulating the cooling section of a hot strip mill for rolling metal strip and associated device
WO2003045599A1 (en) 2001-11-15 2003-06-05 Siemens Aktiengesellschaft Control method for a production line for rolling hot-rolled metal strips disposed upstream of a cooling stretch
JP2008238241A (en) 2007-03-28 2008-10-09 Kobe Steel Ltd Manufacturing method of aluminum metal sheet
DE102007053523A1 (en) 2007-05-30 2008-12-04 Sms Demag Ag Device for influencing temperature distribution over width of slab or strip, particularly in one or multiple hot strip mill, has cooling device, which is provided with nozzles for applying cooling agent on slab or strip
EP2280323A1 (en) 2009-07-08 2011-02-02 Siemens Aktiengesellschaft Control method for a device that affects a milling product
JP2012040593A (en) 2010-08-20 2012-03-01 Jfe Steel Corp Device for controlling finishing temperature in hot rolling

Also Published As

Publication number Publication date
CN104254408B (en) 2016-11-09
EP2841215A1 (en) 2015-03-04
CN104254408A (en) 2014-12-31
WO2013160166A1 (en) 2013-10-31

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