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EP2162245A1 - Rolling of a strip in a rolling train using the last stand of the rolling train as a tension reducer - Google Patents

Rolling of a strip in a rolling train using the last stand of the rolling train as a tension reducer

Info

Publication number
EP2162245A1
EP2162245A1 EP08774590A EP08774590A EP2162245A1 EP 2162245 A1 EP2162245 A1 EP 2162245A1 EP 08774590 A EP08774590 A EP 08774590A EP 08774590 A EP08774590 A EP 08774590A EP 2162245 A1 EP2162245 A1 EP 2162245A1
Authority
EP
European Patent Office
Prior art keywords
rolling
main
control device
main rolling
strip
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP08774590A
Other languages
German (de)
French (fr)
Other versions
EP2162245B1 (en
Inventor
Berthold Botta
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Siemens Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to PL08774590T priority Critical patent/PL2162245T3/en
Publication of EP2162245A1 publication Critical patent/EP2162245A1/en
Application granted granted Critical
Publication of EP2162245B1 publication Critical patent/EP2162245B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • B21B37/58—Roll-force control; Roll-gap control
    • 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
    • B21B37/48—Tension control; Compression control
    • 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
    • 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
    • B21B1/28—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 by cold-rolling, e.g. Steckel cold mill
    • 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
    • B21B1/30—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 non-continuous process
    • B21B1/32—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 non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
    • 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
    • B21B1/30—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 non-continuous process
    • B21B1/32—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 non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
    • B21B1/36—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 non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work by cold-rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B2015/0057—Coiling the rolled product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/02—Tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/02—Tension
    • B21B2265/04—Front or inlet tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/02—Tension
    • B21B2265/08—Back or outlet tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/12—Rolling load or rolling pressure; roll force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/14—Reduction rate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/02—Speed
    • B21B2275/04—Roll speed

Definitions

  • the present invention relates to an operating method for a rolling line for rolling a strip, in particular a metal strip,
  • the rolling train has a plurality of main rolling stands and a reel downstream of the main rolling stands
  • main rolling stands each have work rolls and at least back-up rolls
  • a control device of the rolling train is supplied with data of the belt, which determine at least a non-zero total stitch decrease, by which an initial thickness of the belt in the rolling train is to be reduced,
  • control device determines single-stitch decreases on the basis of the data supplied to it for the main rolling stands
  • control device controls the main rolling stands and the reel in such a way that the strip is rolled in the main rolling stands in accordance with the determined single-stitch decreases and then reeled by the reel,
  • the present invention further relates to a rolling mill control program of the type described above, the control program comprising machine code, the execution of which by the control means causes the control means to operate the rolling mill in accordance with an operating method of the above type.
  • the present invention relates to a data carrier on which such a control program is stored in machine-readable form.
  • the present invention relates to a control device for a rolling train of the type described above, wherein the control device is designed such that it operates the mill train according to an operating method of the type described above.
  • the present invention relates to a rolling mill with a plurality of main rolling stands, a main rolling mill downstream reel and a control device, wherein the main rolling stands each have work rolls and backup rolls and the control device is designed such that it operates the rolling mill according to an operating method of the type described above.
  • the main rolling mills are usually quarto or sexto scaffolds. This is also the main design case in the context of the present invention. However, other embodiments are possible. Excluded are only pure duo-scaffoldings, which have no further rolls apart from the work rolls.
  • a Steckel mill which has two rolling stands, which are preceded by a coiler furnace and a further coiler oven downstream.
  • Each of the Waiz scaffolds is designed as a quarto scaffolding. To adjust the temperature of the coiled tape, the tape is rewound with the lowest possible stitch loss - if possible with stitch loss zero.
  • the pull in front of the reel should in some cases be as low as possible, since otherwise there is a risk that the individual layers of the reeled coil (coil) stick together.
  • the tape Before and behind the last rolling stand where the belt is rolled (ie, in the thickness is reduced), the tape should, however, for reasons of rolling technics have a strip tension.
  • one known measure is to provide an S-roll set between the last main roll stand in which the strip is rolled and the reel.
  • Another known measure is, for example, to provide a driver instead of the S-roller set.
  • the driver can be designed in individual cases as a duo-scaffolding, the tape is not rolled in the duo-scaffolding, but only driven.
  • the object of the present invention is to provide articles, by means of which a decoupling of the train in the belt in front of the reel and the train, with which the belt from the last main roll stand in which the strip is rolled, can be achieved.
  • the decoupling should - at least in terms of approach - also be feasible in existing systems in which the known measures of the prior art are not feasible.
  • the control device determines the single-stitch decreases such that the single-stitch decrease of the main rolling stand immediately preceding the reel is zero. Furthermore, the control device controls the reel main upstream main roll stand such that - based on this main rolling stand - the outlet side train in the band is smaller than the inlet side train, but the band passes through this main rolling mill at least one side without deformation.
  • the band may be any bandwidth, for example broadband (bandwidth 1200 mm and more). As a rule, however, it is a narrow band (width 800 mm and less). Often, the band is formed by splitting a broadband (for example, a broadband of 1500 mm width is divided into two narrow bands of 750 mm width each). In particular, in this case, the band often already before rolling in the rolling mill on a spline.
  • broadband bandwidth 1200 mm and more
  • the band is a narrow band (width 800 mm and less).
  • the band is formed by splitting a broadband (for example, a broadband of 1500 mm width is divided into two narrow bands of 750 mm width each). In particular, in this case, the band often already before rolling in the rolling mill on a spline.
  • the control device preferably controls the main rolling stand arranged directly upstream of the reel in such a way that the
  • the tape should continue to run out of the reel immediately upstream main rolling mill.
  • the straight off Running out of this main rolling stand is particularly important here, as long as the reel has not yet reached the band.
  • the correct running direction of the belt can also be achieved by pivoting the work rolls of the relevant main rolling stand counter to one another or by working them in a wedge profile.
  • the band is often made of steel. Steel can alternatively be cold rolled or hot rolled. In some cases, the present invention can be applied to hot rolling. As a rule, however, the strip is cold rolled in the rolling mill.
  • the number of main rolling stands is in principle arbitrary. At least it is two. As a rule, it is between four and seven.
  • the control device preferably controls the main rolling stand, which is directly preceded by the reel, with rolling force control.
  • the control device determines a nominal rolling force of this main rolling stand such that the strip passes through this main rolling stand without deformation.
  • FIG. 1 shows a rolling mill with main rolling stands, a reel and a control device
  • FIG. 2 shows a main rolling stand and a strip in the strip running direction
  • a rolling mill according to the invention has a plurality of main rolling stands 1, 1 ', a reel 2 and a control unit. direction 3.
  • the main rolling stands 1, 1 ' are successively passed through by a belt 4 and then reeled by the reel 2.
  • the control device 3 controls the main rolling stands 1, 1 'and the reel.
  • the number of main rolling stands 1, 1 ' is usually four to seven. At least it is two.
  • the main rolling stands 1, 1 ' are generally formed (see also FIG. 1) as quarto stands. So they each have work rolls 5, 5 'and back-up rolls 6, 6'. Alternatively, they may additionally have additional rollers, for example in the case of training as a six-high scaffolding intermediate rolls.
  • the reel 2 is the last main rolling stand 1 'immediately downstream.
  • the term "immediately downstream” in this case means that there is no element between the last main rolling stand 1 'and the reel 2, with which a train Z prevailing in the belt 4 can be influenced to a significant degree Reel 2, however, one or more pulleys 7 may be arranged.
  • the last main rolling stand 1 ' is of particular importance in the context of the present invention. For this reason, it was - in contrast to the other main rolling stands 1 - provided with its own reference numeral, namely the reference numeral 1 '. Other sizes, insofar as they relate specifically to the last main rolling stand 1 ', are subsequently provided with an apostrophe. A further significance is not the distinction.
  • the rolled strip 4 in the rolling train is usually a metal strip, for example a steel strip.
  • the band 4 may be a band 4 of any width b, for example broadband, ie a band 4 having a bandwidth b of at least 1200 mm.
  • the band 4 according to FIG. 2 is a narrow band. band whose maximum width b is 800 mm. In most cases, the bandwidth b is even less than 600 mm or less than 700 mm.
  • the band 4 may have a spline already before rolling in the rolling mill. It is thus possible that the band 4 on one side has a larger band thickness dl than on the other side, where it has a smaller band thickness d2.
  • the illustration in FIG. 2 is exaggerated here.
  • the band 4 is cold rolled in the rolling mill usually. In some cases, however, hot rolling is also possible.
  • control device 3 controls, as already mentioned, the main rolling stands 1, 1 'and the reel 2.
  • control is to be understood in a comprehensive sense, ie in the sense of influencing the operating state of the rolling train. not to be understood as opposed to the term “rules”.
  • the controller 3 comprises basic automation (i.e., simple controllers for, for example, roller speeds, nips, rolling forces, etc.) and a superimposed control system. In the context of the present invention, it depends on the superimposed control system.
  • the control device 3 is usually designed as a software programmable device. It is fed to a control program 8.
  • the feeding of the control program 8 can take place, for example, via a network connection (LAN, Internet,...) Or via a data carrier 9 on which the control program 8 is stored.
  • a disk 9 for example, a CD-ROM (see FIG 1), a USB memory stick or a memory card in question.
  • the control program 8 comprises machine code 10, ie program instructions which can be executed directly and directly by the control device 3.
  • the control program 8 can - at- For example, be called by an operator 11 of the rolling mill - in the usual way (mouse click, etc.). Due to the call, it is executed by the controller 3.
  • the execution of the control program 8 by the control device 3 causes the control device 3 to operate the rolling mill in accordance with an operating method which will be explained in more detail below in conjunction with FIG.
  • the control device 3 accepts data of the belt 4 in a step S 1, which data are fed to the control device 3.
  • the data include, for example, information on the bandwidth b, the initial strip thickness d-in, a target final thickness d-out, an initial temperature T and a chemical composition of the strip 4.
  • the data supplied to the control device 3 implicitly or explicitly imposes an overall stitch decrease A by which the initial thickness d-in of the strip 4 in the rolling train is to be reduced.
  • the total decrease A is - of course - greater than zero.
  • the total stitch loss A, the initial strip thickness d-in, and the target final thickness d-out are here according to the relationship
  • the control device 3 uses the data d-in, d-out, b, T supplied to it for the main rolling stands 1, 1 'to determine single-stitch decreases a, a'.
  • the single stitch decreases a, a 'are defined analogously to the total stitch decrease A, but the input and output thicknesses refer to the respective main roll stand 1, 1'.
  • the single stitch decreases a, a 'are of course determined by the control device 3 in the context of step S2 such that they correspond in total to the total stitch decrease A.
  • the control device 3 sets the single-stitch decrease a 'for the last main rolling stand 1' to the value zero. This is in contrast to what is known as skin pass mills. In the case of skin pass mills, the single-cut decrease a 'of the last main rolling stand 1' is relatively small (for example, only 1%), but greater than zero.
  • the other single-stitch decreases a determines the control device 3 in the context of step S2 as needed. In principle, the determination of the other single-stitch decreases a such as if the last main roll stand 1 'simply would not exist.
  • step S2 is always and always carried out as described above. It may alternatively be modified in that the control device 3 first tries to distribute the total stitch decrease A to the main rolling stands 1 with the exception of the last main rolling stand 1 '. If this is possible, step S2 is executed as explained above. Otherwise, the band 4 can only be properly rolled if the single stitch decrease a 'of the last roll stand 1' is greater than zero. In such a case, either the single-stitch decrease a 'may be chosen as small as possible or determined in the usual way.
  • a step S3 the control device 3 controls the main rolling stands 1, 1 'and the reel 2.
  • the control takes place in such a way that the strip 4 is rolled in the main rolling stands 1, 1 'in accordance with the determined single-stitch decreases a, a' and then reeled up by the reel 2.
  • the control device 3 controls the last main rolling stand 1 'in such a way that, with reference to the last main rolling stand 1', the outlet-side pull Za in the strip 4 is smaller than the inlet-side pull Ze.
  • the drive continues to be such that the belt 4 passes through the last main rolling stand 1 'at least one side without deformation.
  • the control device 3 5-to actuate the work rolls 5 'of the last main rolling stand 1' by means of the control device 3 in such a way that the work rolls 5 'are pivoted relative to one another as viewed in the strip running direction x.
  • the work rolls 5 'seen in the strip thickness direction can be employed in a spline (see FIG 4).
  • a rolling force F' which is applied to the last roll stand 1 'by the strip 4, must not be too large.
  • the rolling force F 'must therefore be below an upper limit S.
  • the rolling force F 'must lie above a lower barrier S'.
  • the control device 3 therefore preferably controls the last rolling stand 1 'with rolling force control.
  • the target rolling force F '* for the last main rolling stand 1' is determined here by the control device 3 such that it lies between the lower barrier S 'and the upper barrier S.
  • the belt 4 is rolled on the one hand in the main rolling stands 1, 1 'and on the other hand is uncoiled by the reel 2.
  • start of the rolling process refers to the time until the time when the reel 2 grips the band 4.
  • the control device 3 controls the last main rolling stand 1 'accordingly.
  • Control device 3 the last main rolling mill 1 'drive such that the work rolls 5' of this main rolling stand 1 'seen in the tape running direction x are pivoted against each other.
  • the control device 3 it is possible for the control device 3 to actuate the last main rolling stand 1 'in such a way that the work rolls 5' of this main rolling stand 1 'form a wedge profile viewed in the strip thickness direction.
  • the embodiments according to the invention have many advantages.

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

Abstract

A rolling train for rolling a strip (4) has a number of main rolling stands (1, 1') and a coiler (2) arranged downstream of the main rolling stands (1, 1'). The main rolling stands (1, 1') respectively have work rolls (5, 5') and at least backing rolls (6, 6'). Data (d-in, d-out, b, T) of the strip (4), which establish at least an overall pass reduction other than zero by which an initial thickness (d-in) of the strip (4) is to be reduced in the rolling train, are fed to a control device (3) of the rolling train. The control device (3) determines individual pass reductions for the main rolling stands (1, 1') on the basis of the data (d-in, d-out, b, T) fed to it. It controls the main rolling stands (1, 1') and the coiler (2) in such a way that the strip (4) is rolled in the main rolling stands (1, 1') in accordance with the individual pass reductions determined and is then coiled up by the coiler (2). The control device (3) determines the individual pass reductions in such a way that the individual pass reduction of the main rolling stand (1') arranged directly upstream of the coiler (2) is zero. It controls the main rolling stand (1') arranged directly upstream of the coiler (2) in such a way that - with respect to this main rolling stand (1') - the tension (Za) in the strip (4) on the outlet side is less than the tension (Ze) on the inlet side, but the strip (4) runs through this main rolling stand (1') without undergoing any forming, at least on one side.

Description

Beschreibungdescription

Walzen eines Bandes in einer Walzstraße unter Nutzung des letzen Gerüsts der Walzstraße als ZugverringererRolling of a strip in a rolling train using the last stand of the rolling train as Zugverringerer

Die vorliegende Erfindung betrifft ein Betriebsverfahren für eine Walzstraße zum Walzen eines Bandes, insbesondere eines Metallbandes,The present invention relates to an operating method for a rolling line for rolling a strip, in particular a metal strip,

- wobei die Walzstraße mehrere Hauptwalzgerüste und einen den Hauptwalzgerüsten nachgeordneten Haspel aufweist,wherein the rolling train has a plurality of main rolling stands and a reel downstream of the main rolling stands,

- wobei die Hauptwalzgerüste jeweils Arbeitswalzen und zumindest Stützwalzen aufweisen,wherein the main rolling stands each have work rolls and at least back-up rolls,

- wobei einer Steuereinrichtung der Walzstraße Daten des Bandes zugeführt werden, die zumindest eine von Null verschie- dene Gesamtstichabnahme festlegen, um welche eine Anfangsdicke des Bandes in der Walzstraße reduziert werden soll,wherein a control device of the rolling train is supplied with data of the belt, which determine at least a non-zero total stitch decrease, by which an initial thickness of the belt in the rolling train is to be reduced,

- wobei die Steuereinrichtung anhand der ihr zugeführten Daten für die Hauptwalzgerüste Einzelstichabnahmen ermittelt,wherein the control device determines single-stitch decreases on the basis of the data supplied to it for the main rolling stands,

- wobei die Steuereinrichtung die Hauptwalzgerüste und den Haspel derart steuert, dass das Band in den Hauptwalzgerüsten entsprechend den ermittelten Einzelstichabnahmen gewalzt und sodann vom Haspel aufgehaspelt wird,the control device controls the main rolling stands and the reel in such a way that the strip is rolled in the main rolling stands in accordance with the determined single-stitch decreases and then reeled by the reel,

Die vorliegende Erfindung betrifft weiterhin ein Steuerpro- gramm für eine Walzstraße der obenstehend beschriebenen Art, wobei das Steuerprogramm Maschinencode umfasst, dessen Ausführung durch die Steuereinrichtung bewirkt, dass die Steuereinrichtung die Walzstraße gemäß einem Betriebsverfahren der obigen Art betreibt.The present invention further relates to a rolling mill control program of the type described above, the control program comprising machine code, the execution of which by the control means causes the control means to operate the rolling mill in accordance with an operating method of the above type.

Weiterhin betrifft die vorliegende Erfindung einen Datenträger, auf dem in maschinenlesbarer Form ein derartiges Steuerprogramm gespeichert ist.Furthermore, the present invention relates to a data carrier on which such a control program is stored in machine-readable form.

Weiterhin betrifft die vorliegende Erfindung eine Steuereinrichtung für eine Walzstraße der obenstehend beschriebenen Art, wobei die Steuereinrichtung derart ausgebildet ist, dass sie die Walzstraße gemäß einem Betriebsverfahren der obenstehend beschriebenen Art betreibt.Furthermore, the present invention relates to a control device for a rolling train of the type described above, wherein the control device is designed such that it operates the mill train according to an operating method of the type described above.

Schließlich betrifft die vorliegende Erfindung eine Walzstra- ße mit mehreren Hauptwalzgerüsten, einem den Hauptwalzgerüsten nachgeordneten Haspel und einer Steuereinrichtung, wobei die Hauptwalzgerüste jeweils Arbeitswalzen und Stützwalzen aufweisen und die Steuereinrichtung derart ausgebildet ist, dass sie die Walzstraße gemäß einem Betriebsverfahren der obenstehend beschriebenen Art betreibt.Finally, the present invention relates to a rolling mill with a plurality of main rolling stands, a main rolling mill downstream reel and a control device, wherein the main rolling stands each have work rolls and backup rolls and the control device is designed such that it operates the rolling mill according to an operating method of the type described above.

Die obenstehend beschriebenen Gegenstände sind allgemein bekannt .The objects described above are well known.

Die Hauptwalzgerüste sind in der Regel Quarto- oder Sexto- Gerüste. Dies ist auch im Rahmen der vorliegenden Erfindung der hauptsächliche Ausgestaltungsfall. Es sind jedoch auch andere Ausgestaltungen möglich. Ausgeschlossen sollen lediglich reine Duo-Gerüste sein, die außer den Arbeitswalzen kei- ne weiteren Walzen aufweisen.The main rolling mills are usually quarto or sexto scaffolds. This is also the main design case in the context of the present invention. However, other embodiments are possible. Excluded are only pure duo-scaffoldings, which have no further rolls apart from the work rolls.

Aus der WO 99/51368 Al ist ein Steckelwalzwerk bekannt, das zwei Walzgerüste aufweist, denen ein Haspelofen vorgeordnet und ein weiterer Haspelofen nachgeordnet ist. Jedes der WaIz- gerüste ist als Quartogerüst ausgebildet. Zur Temperatureinstellung des gehaspelten Bandes wird das Band mit möglichst geringer Stichabnahme - möglichst mit Stichabnahme Null - umgehaspelt .From WO 99/51368 Al a Steckel mill is known which has two rolling stands, which are preceded by a coiler furnace and a further coiler oven downstream. Each of the Waiz scaffolds is designed as a quarto scaffolding. To adjust the temperature of the coiled tape, the tape is rewound with the lowest possible stitch loss - if possible with stitch loss zero.

Aus der DE 42 43 045 Al ist bekannt, zwischen den Walzgerüsten einer Walzstraße untereinander und zwischen den Walzgerüsten und den Haspeln einen geregelten Bandzug einzustellen.From DE 42 43 045 Al is known to set between the rolling stands of a rolling train with each other and between the rolling stands and the reels a regulated strip tension.

Beim Walzen von Bändern nebst nachfolgendem Aufhaspeln soll in manchen Fällen der Zug vor dem Haspel möglichst niedrig sein, da andernfalls die Gefahr besteht, dass die einzelnen Lagen des aufgehaspelten Bundes (coil) aneinander kleben. Vor und auch hinter dem letzten Walzgerüst, in dem das Band ge- walzt wird (d. h. in der Dicke reduziert wird), soll das Band hingegen aus walztechnischen Gründen einen Bandzug aufweisen.When rolling tapes together with subsequent coiling, the pull in front of the reel should in some cases be as low as possible, since otherwise there is a risk that the individual layers of the reeled coil (coil) stick together. Before and behind the last rolling stand where the belt is rolled (ie, in the thickness is reduced), the tape should, however, for reasons of rolling technics have a strip tension.

Im Stand der Technik sind zur Entkopplung des Zuges im Band vor dem Haspel und des Zuges im Band hinter dem letztenIn the prior art are for decoupling of the train in the band before the reel and the train in the band behind the last

Hauptwalzgerüst, in dem das Band gewalzt wird, verschiedene Maßnahmen bekannt.Main mill in which the strip is rolled, various measures known.

Eine bekannte Maßnahme besteht beispielsweise darin, zwischen dem letzten Hauptwalzgerüst, in dem das Band gewalzt wird, und dem Haspel einen S-Rollensatz vorzusehen. Eine weitere bekannte Maßnahme besteht beispielsweise darin, anstelle des S-Rollensatzes einen Treiber vorzusehen. Der Treiber kann in Einzelfällen auch als Duo-Gerüst ausgebildet sein, wobei das Band in dem Duo-Gerüst nicht gewalzt wird, sondern nur getrieben wird.For example, one known measure is to provide an S-roll set between the last main roll stand in which the strip is rolled and the reel. Another known measure is, for example, to provide a driver instead of the S-roller set. The driver can be designed in individual cases as a duo-scaffolding, the tape is not rolled in the duo-scaffolding, but only driven.

Die obenstehend genannten, bekannten Maßnahmen lassen sich sehr einfach realisieren, wenn eine Walzstraße neu gebaut wird. Bei bestehenden Walzstraßen hingegen sind die Maßnahmen - insbesondere aus Platzgründen - nur mit Schwierigkeiten, nur mit größeren Umbauten (einschließlich der damit verbundenen Kosten) oder gar nicht realisierbar.The above-mentioned, known measures can be realized very easily when a rolling mill is rebuilt. In existing rolling mills, however, the measures - especially for reasons of space - only with difficulty, only with larger conversions (including the associated costs) or not feasible.

Die Aufgabe der vorliegenden Erfindung besteht darin, Gegenstände zu schaffen, auf Grund derer eine Entkopplung des Zuges im Band vor dem Haspel und des Zuges, mit dem das Band aus dem letzten Hauptwalzgerüst, in dem das Band gewalzt wird, ausläuft, erreicht werden kann. Die Entkopplung soll hierbei - zumindest vom Ansatz her - auch bei bestehenden Anlagen realisierbar sein, bei denen die bekannten Maßnahmen des Standes der Technik nicht realisierbar sind.The object of the present invention is to provide articles, by means of which a decoupling of the train in the belt in front of the reel and the train, with which the belt from the last main roll stand in which the strip is rolled, can be achieved. In this case, the decoupling should - at least in terms of approach - also be feasible in existing systems in which the known measures of the prior art are not feasible.

Die Aufgabe wird durch ein Betriebsverfahren mit den Merkma- len des Anspruchs 1, ein Steuerprogramm mit den Merkmalen des Anspruchs 9, einen Datenträger, auf dem ein derartiges Steuerprogramm gespeichert ist, eine Steuereinrichtung für eine Walzstraße mit den Merkmalen des Anspruchs 11 und eine Walz- Straße mit den Merkmalen des Anspruchs 12 gelöst. Vorteilhafte Ausgestaltungen sind Gegenstand der abhängigen Ansprüche 2 bis 8.The object is achieved by an operating method having the features of claim 1, a control program having the features of claim 9, a data carrier on which such a control program is stored, a rolling mill control device having the features of claim 11 and a rolling mill. Road solved with the features of claim 12. Advantageous embodiments are the subject of the dependent claims 2 to 8.

Erfindungsgemäß ermittelt die Steuereinrichtung die Einzelstichabnahmen derart, dass die Einzelstichabnahme des dem Haspel unmittelbar vorgeordneten Hauptwalzgerüsts Null ist. Weiterhin steuert die Steuereinrichtung das dem Haspel unmittelbar vorgeordnete Hauptwalzgerüst derart, dass - bezogen auf dieses Hauptwalzgerüst - der auslaufseitige Zug im Band kleiner als der einlaufseitige Zug ist, das Band jedoch dieses Hauptwalzgerüst zumindest einseitig umformungsfrei durchläuft.According to the invention, the control device determines the single-stitch decreases such that the single-stitch decrease of the main rolling stand immediately preceding the reel is zero. Furthermore, the control device controls the reel main upstream main roll stand such that - based on this main rolling stand - the outlet side train in the band is smaller than the inlet side train, but the band passes through this main rolling mill at least one side without deformation.

Das Band kann eine beliebige Bandbreite aufweisen, beispielsweise ein Breitband sein (Bandbreite 1200 mm und mehr) . In der Regel ist es jedoch ein Schmalband (Breite 800 mm und weniger) . Oftmals entsteht das Band durch ein Teilen eines Breitbandes (beispielsweise wird ein Breitband von 1500 mm Breite in zwei Schmalbänder von je 750 mm Breite geteilt) . Insbesondere in diesem Fall weist das Band oftmals bereits vor dem Walzen in der Walzstraße ein Keilprofil auf.The band may be any bandwidth, for example broadband (bandwidth 1200 mm and more). As a rule, however, it is a narrow band (width 800 mm and less). Often, the band is formed by splitting a broadband (for example, a broadband of 1500 mm width is divided into two narrow bands of 750 mm width each). In particular, in this case, the band often already before rolling in the rolling mill on a spline.

Vorzugsweise steuert die Steuereinrichtung das dem Haspel un- mittelbar vorgeordnete Hauptwalzgerüst derart an, dass dasThe control device preferably controls the main rolling stand arranged directly upstream of the reel in such a way that the

Band dieses Hauptwalzgerüst über seine gesamte Breite umformungsfrei durchläuft. Bei Bändern mit - über die Bandbreite gesehen - gleichmäßigem bzw. zumindest symmetrischem Dickenverlauf ist dies ohne weiteres möglich. Die letztgenannte Vorgehensweise ist jedoch auch dann anzustreben, wenn das Band ein Keilprofil aufweist. In diesem Fall können beispielsweise die Arbeitswalzen des betreffenden Hauptwalzgerüsts in Bandlaufrichtung gesehen gegeneinander verschwenkt werden und/oder in Banddickenrichtung gesehen in einem Keil- profil angestellt werden.Band this main rolling mill passes through its entire width without deformation. For bands with - over the bandwidth seen - even or at least symmetrical thickness course this is easily possible. However, the latter approach is also desirable if the band has a spline. In this case, for example, the work rolls of the respective main rolling stand can be pivoted relative to one another as viewed in the direction of strip travel and / or be employed in a wedge profile as seen in the strip thickness direction.

Das Band sollte weiterhin aus dem dem Haspel unmittelbar vorgeordneten Hauptwalzgerüst gerade auslaufen. Das gerade Aus- laufen aus diesem Hauptwalzgerüst ist hierbei besonders wichtig, solange der Haspel das Band noch nicht gegriffen hat. Auch die korrekte Laufrichtung des Bandes kann dadurch erreicht werden, dass die Arbeitswalzen des betreffenden Haupt- walzgerüsts entsprechend gegeneinander verschwenkt werden oder in einem Keilprofil angestellt werden.The tape should continue to run out of the reel immediately upstream main rolling mill. The straight off Running out of this main rolling stand is particularly important here, as long as the reel has not yet reached the band. The correct running direction of the belt can also be achieved by pivoting the work rolls of the relevant main rolling stand counter to one another or by working them in a wedge profile.

Das Band besteht oftmals aus Stahl. Stahl kann alternativ kalt- oder warmgewalzt werden. In manchen Fällen kann die vorliegende Erfindung beim Warmwalzen angewendet werden. In der Regel jedoch wird das Band in der Walzstraße kaltgewalzt.The band is often made of steel. Steel can alternatively be cold rolled or hot rolled. In some cases, the present invention can be applied to hot rolling. As a rule, however, the strip is cold rolled in the rolling mill.

Die Anzahl an Hauptwalzgerüsten ist prinzipiell beliebig. Minimal beträgt sie zwei. In der Regel liegt sie zwischen vier und sieben.The number of main rolling stands is in principle arbitrary. At least it is two. As a rule, it is between four and seven.

Vorzugsweise steuert die Steuereinrichtung das dem Haspel unmittelbar vorgeordnete Hauptwalzgerüst walzkraftgeregelt . Die Steuereinrichtung ermittelt in diesem Fall eine Sollwalzkraft dieses Hauptwalzgerüsts derart, dass das Band dieses Hauptwalzgerüst umformungsfrei durchläuft.The control device preferably controls the main rolling stand, which is directly preceded by the reel, with rolling force control. In this case, the control device determines a nominal rolling force of this main rolling stand such that the strip passes through this main rolling stand without deformation.

Weitere Vorteile und Einzelheiten ergeben sich aus der nachfolgenden Beschreibung von Ausführungsbeispielen in Verbin- düng mit den Zeichnungen. Es zeigen in Prinzipdarstellung:Further advantages and details will become apparent from the following description of exemplary embodiments in conjunction düng with the drawings. In a schematic representation:

FIG 1 eine Walzstraße mit Hauptwalzgerüsten, einem Haspel und einer Steuereinrichtung,1 shows a rolling mill with main rolling stands, a reel and a control device,

FIG 2 ein Hauptwalzgerüst und ein Band in Bandlaufrichtung gesehen,FIG. 2 shows a main rolling stand and a strip in the strip running direction, FIG.

FIG 3 ein Ablaufdiagramm,3 shows a flow chart,

FIG 4 das letzte Hauptwalzgerüst in Bandlaufrichtung gesehen und4 shows the last main rolling mill seen in the direction of tape travel and

FIG 5 das letzte Hauptwalzgerüst in perspektivischer Darstellung.5 shows the last main rolling mill in a perspective view.

Gemäß FIG 1 weist eine erfindungsgemäße Walzstraße mehrere Hauptwalzgerüste 1, 1', einen Haspel 2 und eine Steuerein- richtung 3 auf. Die Hauptwalzgerüste 1, 1' werden nacheinander von einem Band 4 durchlaufen und sodann vom Haspel 2 aufgehaspelt. Die Steuereinrichtung 3 steuert die Hauptwalzgerüste 1, 1' und den Haspel.According to FIG. 1, a rolling mill according to the invention has a plurality of main rolling stands 1, 1 ', a reel 2 and a control unit. direction 3. The main rolling stands 1, 1 'are successively passed through by a belt 4 and then reeled by the reel 2. The control device 3 controls the main rolling stands 1, 1 'and the reel.

Die Anzahl an Hauptwalzgerüsten 1, 1' beträgt in der Regel vier bis sieben. Minimal liegt sie bei zwei. Die Hauptwalzgerüste 1, 1' sind in der Regel (siehe auch FIG 1) als Quarto- Gerüste ausgebildet. Sie weisen also jeweils Arbeitswalzen 5, 5' und Stützwalzen 6, 6' auf. Sie können alternativ zusätzlich weitere Walzen aufweisen, beispielsweise im Falle der Ausbildung als Sexto-Gerüste Zwischenwalzen.The number of main rolling stands 1, 1 'is usually four to seven. At least it is two. The main rolling stands 1, 1 'are generally formed (see also FIG. 1) as quarto stands. So they each have work rolls 5, 5 'and back-up rolls 6, 6'. Alternatively, they may additionally have additional rollers, for example in the case of training as a six-high scaffolding intermediate rolls.

Der Haspel 2 ist dem letzten Hauptwalzgerüst 1' unmittelbar nachgeordnet. Der Begriff „unmittelbar nachgeordnet" bedeutet in diesem Fall, dass sich zwischen dem letzten Hauptwalzgerüst 1' und dem Haspel 2 kein Element befindet, mit dem ein im Band 4 herrschender Zug Z in nennenswertem Umfang beeinflussbar ist. Zwischen dem letzten Hauptwalzgerüst 1' und dem Haspel 2 können jedoch eine oder mehrere Umlenkrollen 7 angeordnet sein.The reel 2 is the last main rolling stand 1 'immediately downstream. The term "immediately downstream" in this case means that there is no element between the last main rolling stand 1 'and the reel 2, with which a train Z prevailing in the belt 4 can be influenced to a significant degree Reel 2, however, one or more pulleys 7 may be arranged.

Das letzte Hauptwalzgerüst 1' ist im Rahmen der vorliegenden Erfindung von besonderer Bedeutung. Aus diesem Grund wurde es - im Gegensatz zu den anderen Hauptwalzgerüsten 1 - mit einem eigenen Bezugszeichen versehen, nämlich dem Bezugszeichen 1'. Auch andere Größen, soweit sie sich speziell auf das letzte Hauptwalzgerüst 1' beziehen, sind nachfolgend mit einem Apostroph versehen. Eine weitergehende Bedeutung kommt der Unterscheidung nicht zu.The last main rolling stand 1 'is of particular importance in the context of the present invention. For this reason, it was - in contrast to the other main rolling stands 1 - provided with its own reference numeral, namely the reference numeral 1 '. Other sizes, insofar as they relate specifically to the last main rolling stand 1 ', are subsequently provided with an apostrophe. A further significance is not the distinction.

Das in der Walzstraße gewalzte Band 4 ist in der Regel ein Metallband, beispielsweise ein Stahlband. Es kann sich bei dem Band 4 um ein Band 4 beliebiger Breite b handeln, bei- spielsweise um Breitband, also um ein Band 4, das eine Bandbreite b von mindestens 1200 mm aufweist. In der Regel handelt es sich bei dem Band 4 jedoch gemäß FIG 2 um ein Schmal- band, dessen Bandbreite b maximal 800 mm beträgt. Meist liegt die Bandbreite b sogar unter 600 mm oder unter 700 mm.The rolled strip 4 in the rolling train is usually a metal strip, for example a steel strip. The band 4 may be a band 4 of any width b, for example broadband, ie a band 4 having a bandwidth b of at least 1200 mm. As a rule, however, the band 4 according to FIG. 2 is a narrow band. band whose maximum width b is 800 mm. In most cases, the bandwidth b is even less than 600 mm or less than 700 mm.

Insbesondere im Falle von Schmalband kann das Band 4 bereits vor dem Walzen in der Walzstraße ein Keilprofil aufweisen. Es ist also möglich, dass das Band 4 auf der einen Seite eine größere Banddicke dl aufweist als auf der anderen Seite, wo es eine kleinere Banddicke d2 aufweist. Die Darstellung in FIG 2 ist hierbei übertrieben.Especially in the case of narrow band, the band 4 may have a spline already before rolling in the rolling mill. It is thus possible that the band 4 on one side has a larger band thickness dl than on the other side, where it has a smaller band thickness d2. The illustration in FIG. 2 is exaggerated here.

Das Band 4 wird in der Walzstraße in der Regel kaltgewalzt. In Einzelfällen ist jedoch ein Warmwalzen ebenfalls möglich.The band 4 is cold rolled in the rolling mill usually. In some cases, however, hot rolling is also possible.

Die Steuereinrichtung 3 steuert, wie bereits erwähnt, die Hauptwalzgerüste 1, 1' und den Haspel 2. Der Begriff „Steuern" ist hierbei im umfassenden Sinne zu verstehen, d.h. im Sinne eines Beeinflussens des Betriebszustandes der Walzstraße. Hingegen soll der Begriff „Steuern" nicht als Gegensatz zum Begriff „Regeln" zu verstehen sein.The control device 3 controls, as already mentioned, the main rolling stands 1, 1 'and the reel 2. The term "control" is to be understood in a comprehensive sense, ie in the sense of influencing the operating state of the rolling train. not to be understood as opposed to the term "rules".

Die Steuereinrichtung 3 umfasst eine Basisautomatisierung (d.h. einfache Regler beispielsweise für Walzendrehzahlen, Walzspalte, Walzkräfte usw.) und ein überlagertes Leitsystem. Im Rahmen der vorliegenden Erfindung kommt es auf das überla- gerte Leitsystem an.The controller 3 comprises basic automation (i.e., simple controllers for, for example, roller speeds, nips, rolling forces, etc.) and a superimposed control system. In the context of the present invention, it depends on the superimposed control system.

Die Steuereinrichtung 3 ist in der Regel als softwareprogrammierbare Einrichtung ausgebildet. Ihr wird ein Steuerprogramm 8 zugeführt. Das Zuführen des Steuerprogramms 8 kann bei- spielsweise über eine Netzwerkanbindung (LAN, Internet, ...) oder über einen Datenträger 9 erfolgen, auf dem das Steuerprogramm 8 gespeichert ist. Als Datenträger 9 kommen beispielsweise eine CD-ROM (siehe FIG 1), ein USB-Memorystick oder eine Speicherkarte in Frage.The control device 3 is usually designed as a software programmable device. It is fed to a control program 8. The feeding of the control program 8 can take place, for example, via a network connection (LAN, Internet,...) Or via a data carrier 9 on which the control program 8 is stored. As a disk 9, for example, a CD-ROM (see FIG 1), a USB memory stick or a memory card in question.

Das Steuerprogramm 8 umfasst Maschinencode 10, also Programmanweisungen, die von der Steuereinrichtung 3 direkt und unmittelbar ausführbar sind. Das Steuerprogramm 8 kann - bei- spielsweise von einem Bediener 11 der Walzstraße - auf übliche Weise (Mausklick usw.) aufgerufen werden. Auf Grund des Aufrufens wird es von der Steuereinrichtung 3 ausgeführt. Das Ausführen des Steuerprogramms 8 durch die Steuereinrichtung 3 bewirkt, dass die Steuereinrichtung 3 die Walzstraße gemäß einem Betriebsverfahren betreibt, das nachfolgend in Verbindung mit FIG 3 näher erläutert wird.The control program 8 comprises machine code 10, ie program instructions which can be executed directly and directly by the control device 3. The control program 8 can - at- For example, be called by an operator 11 of the rolling mill - in the usual way (mouse click, etc.). Due to the call, it is executed by the controller 3. The execution of the control program 8 by the control device 3 causes the control device 3 to operate the rolling mill in accordance with an operating method which will be explained in more detail below in conjunction with FIG.

Gemäß FIG 3 nimmt die Steuereinrichtung 3 in einem Schritt Sl Daten des Bandes 4 entgegen, die der Steuereinrichtung 3 zugeführt werden. Die Daten umfassen beispielsweise Angaben über die Bandbreite b, die anfängliche Banddicke d-in, eine Soll-Enddicke d-out, eine Anfangstemperatur T und eine chemische Zusammensetzung des Bandes 4. Insbesondere legen die der Steuereinrichtung 3 zugeführten Daten implizit oder explizit eine Gesamtstichabnahme A fest, um welche die Anfangsdicke d-in des Bandes 4 in der Walzstraße reduziert werden soll. Die Gesamtstichabnahme A ist - selbstverständlich - größer als Null. Die Gesamtstichabnahme A, die anfängliche Banddicke d-in und die Soll-Enddicke d-out sind hierbei gemäß der BeziehungAccording to FIG. 3, the control device 3 accepts data of the belt 4 in a step S 1, which data are fed to the control device 3. The data include, for example, information on the bandwidth b, the initial strip thickness d-in, a target final thickness d-out, an initial temperature T and a chemical composition of the strip 4. In particular, the data supplied to the control device 3 implicitly or explicitly imposes an overall stitch decrease A by which the initial thickness d-in of the strip 4 in the rolling train is to be reduced. The total decrease A is - of course - greater than zero. The total stitch loss A, the initial strip thickness d-in, and the target final thickness d-out are here according to the relationship

. Λ d -out, Λ d -out

A = 1 d -inA = 1 d -in

miteinander verknüpft.linked together.

In einem Schritt S2 ermittelt die Steuereinrichtung 3 anhand der ihr zugeführten Daten d-in, d-out, b, T für die Hauptwalzgerüste 1, 1' Einzelstichabnahmen a, a' . Die Einzelstich- abnahmen a, a' sind hierbei analog zur Gesamtstichabnahme A definiert, wobei sich jedoch die Eingangs- und Ausgangsdicken auf das jeweilige Hauptwalzgerüst 1, 1' beziehen. Die Einzelstichabnahmen a, a' werden von der Steuereinrichtung 3 im Rahmen des Schrittes S2 selbstverständlich derart ermittelt, dass sie insgesamt mit der Gesamtstichabnahme A korrespondieren . Erfindungsgemäß setzt die Steuereinrichtung 3 die Einzelstichabnahme a' für das letzte Hauptwalzgerüst 1' auf den Wert Null. Dies stellt einen Gegensatz zu sogenannten Dressiergerüsten dar. Denn bei Dressiergerüsten ist die Einzel- stichabnahme a' des letzten Hauptwalzgerüsts 1' zwar relativ klein (beispielsweise nur 1 %) , jedoch größer als Null.In a step S2, the control device 3 uses the data d-in, d-out, b, T supplied to it for the main rolling stands 1, 1 'to determine single-stitch decreases a, a'. The single stitch decreases a, a 'are defined analogously to the total stitch decrease A, but the input and output thicknesses refer to the respective main roll stand 1, 1'. The single stitch decreases a, a 'are of course determined by the control device 3 in the context of step S2 such that they correspond in total to the total stitch decrease A. According to the invention, the control device 3 sets the single-stitch decrease a 'for the last main rolling stand 1' to the value zero. This is in contrast to what is known as skin pass mills. In the case of skin pass mills, the single-cut decrease a 'of the last main rolling stand 1' is relatively small (for example, only 1%), but greater than zero.

Die anderen Einzelstichabnahmen a ermittelt die Steuereinrichtung 3 im Rahmen des Schrittes S2 nach Bedarf. Im Prinzip erfolgt die Ermittlung der anderen Einzelstichabnahmen a derart, als ob das letzte Hauptwalzgerüst 1' schlichtweg nicht vorhanden wäre.The other single-stitch decreases a determines the control device 3 in the context of step S2 as needed. In principle, the determination of the other single-stitch decreases a such as if the last main roll stand 1 'simply would not exist.

Es ist möglich, dass der Schritt S2 immer und stets so ausge- führt wird, wie dies obenstehend beschrieben wurde. Er kann alternativ dahingehend modifiziert sein, dass die Steuereinrichtung 3 zunächst versucht, die Gesamtstichabnahme A auf die Hauptwalzgerüste 1 mit Ausnahme des letzten Hauptwalzgerüstes 1' zu verteilen. Wenn dies möglich ist, wird der Schritt S2 so ausgeführt, wie er obenstehend erläutert wurde. Anderenfalls ist das Band 4 nur dann ordnungsgemäß walzbar, wenn die Einzelstichabnahme a' des letzten Walzgerüsts 1' größer als Null ist. In einem derartigen Fall kann entweder die Einzelstichabnahme a' so klein wie möglich gewählt werden oder aber auf übliche Weise bestimmt werden.It is possible that step S2 is always and always carried out as described above. It may alternatively be modified in that the control device 3 first tries to distribute the total stitch decrease A to the main rolling stands 1 with the exception of the last main rolling stand 1 '. If this is possible, step S2 is executed as explained above. Otherwise, the band 4 can only be properly rolled if the single stitch decrease a 'of the last roll stand 1' is greater than zero. In such a case, either the single-stitch decrease a 'may be chosen as small as possible or determined in the usual way.

In einem Schritt S3 steuert die Steuereinrichtung 3 die Hauptwalzgerüste 1, 1' und den Haspel 2 an. Die Ansteuerung erfolgt derart, dass das Band 4 in den Hauptwalzgerüsten 1, 1' entsprechend den ermittelten Einzelstichabnahmen a, a' gewalzt und sodann vom Haspel 2 aufgehaspelt wird. Die Steuereinrichtung 3 steuert hierbei das letzte Hauptwalzgerüst 1' derart, dass - bezogen auf das letzte Hauptwalzgerüst 1' der auslaufseitige Zug Za im Band 4 kleiner als der einlaufseiti- ge Zug Ze ist. Die Ansteuerung erfolgt jedoch weiterhin derart, dass das Band 4 das letzte Hauptwalzgerüst 1' zumindest einseitig umformungsfrei durchläuft. Der Fall, dass das Band 4 das letzte Hauptwalzgerüst 1' nur einseitig, nicht aber über seine gesamte Breite b umformungsfrei durchläuft, kann in Einzelfällen erforderlich sein, wenn das Band 4 ein Keilprofil aufweist. Wenn das Band 4 hingegen kein derartiges Keilprofil aufweist, ist es ohne weiteres möglich, dass die Steuereinrichtung 3 das letzte Walzgerüst 1' derart ansteuert, dass das Band 4 das letzte Hauptwalzgerüst 1' über seine gesamte Breite b umformungsfrei durchläuft (vergleiche FIG 4) . Bevorzugt ist diese Vorgehensweise auch dann, wenn das Band 4 das obenstehend erwähnte Keilprofil aufweist. Um diesen Zustand zu erreichen, kann es - siehe FIG 5 - erforderlich sein, die Arbeitswalzen 5' des letzten Hauptwalzgerüsts 1' mittels der Steuereinrichtung 3 derart anzusteuern, dass die Arbeitswalzen 5' in Bandlaufrichtung x gesehen gegeneinander verschwenkt werden. Alternativ oder zusätzlich können die Arbeitswalzen 5' in Banddickenrichtung gesehen in einem Keilprofil angestellt werden (siehe FIG 4) .In a step S3, the control device 3 controls the main rolling stands 1, 1 'and the reel 2. The control takes place in such a way that the strip 4 is rolled in the main rolling stands 1, 1 'in accordance with the determined single-stitch decreases a, a' and then reeled up by the reel 2. In this case, the control device 3 controls the last main rolling stand 1 'in such a way that, with reference to the last main rolling stand 1', the outlet-side pull Za in the strip 4 is smaller than the inlet-side pull Ze. However, the drive continues to be such that the belt 4 passes through the last main rolling stand 1 'at least one side without deformation. The case that the band 4 passes through the last main rolling stand 1 'only on one side, but not over its entire width b without deformation, may be required in individual cases, when the band 4 has a spline. On the other hand, if the belt 4 does not have such a spline, it is readily possible for the control device 3 to drive the last rolling stand 1 'in such a way that the belt 4 passes through the last main rolling stand 1' over its entire width b (see FIG. 4). This procedure is also preferred if the band 4 has the above-mentioned spline profile. To achieve this state, it may be necessary-see FIG. 5-to actuate the work rolls 5 'of the last main rolling stand 1' by means of the control device 3 in such a way that the work rolls 5 'are pivoted relative to one another as viewed in the strip running direction x. Alternatively or additionally, the work rolls 5 'seen in the strip thickness direction can be employed in a spline (see FIG 4).

Um zu erreichen, dass das Band 4 das letzte Walzgerüst 1' um- formungsfrei durchläuft, darf eine Walzkraft F' , mit der das letzte Walzgerüst 1' das Band 4 beaufschlagt, nicht zu groß sein. Die Walzkraft F' muss also unter einer oberen Schranke S liegen. Um andererseits erreichen zu können, dass der aus- laufseitige Zug Za vom einlaufseitigen Zug Ze entkoppelt ist, muss die Walzkraft F' oberhalb einer unteren Schranke S' liegen. Vorzugsweise steuert die Steuereinrichtung 3 daher das letzte Walzgerüst 1' walzkraftgeregelt . Die Sollwalzkraft F'* für das letzte Hauptwalzgerüst 1' wird hierbei von der Steuereinrichtung 3 derart ermittelt, dass sie zwischen der unte- ren Schranke S' und der oberen Schranke S liegt.In order to ensure that the band 4 passes through the last roll stand 1 'without deformation, a rolling force F', which is applied to the last roll stand 1 'by the strip 4, must not be too large. The rolling force F 'must therefore be below an upper limit S. On the other hand, in order to be able to achieve that the discharge-side pull Za is decoupled from the inlet-side pull Ze, the rolling force F 'must lie above a lower barrier S'. The control device 3 therefore preferably controls the last rolling stand 1 'with rolling force control. The target rolling force F '* for the last main rolling stand 1' is determined here by the control device 3 such that it lies between the lower barrier S 'and the upper barrier S.

Obenstehend wurde der stabile Betrieb der Walzstraße beschrieben, in dem das Band 4 einerseits in den Hauptwalzgerüsten 1, 1' gewalzt wird und andererseits vom Haspel 2 ge- haspelt wird. Nachfolgend wird der Fall behandelt, der zu Beginn des Walzvorgangs auftritt. Als „Beginn des Walzvorgangs" ist hierbei die Zeitspanne bis zu dem Zeitpunkt gemeint, zu dem der Haspel 2 das Band 4 greift. Während der oben genannten Zeitspanne ist es möglich, dass das aus dem letzten Hauptwalzgerüst 1' auslaufende Band 4 seitlich auswandert. Um ein derartiges seitliches Auswandern zu verhindern, steuert die Steuereinrichtung 3 das letzte Hauptwalzgerüst 1' entsprechend an. Insbesondere kann dieThe stable operation of the rolling train has been described above, in which the belt 4 is rolled on the one hand in the main rolling stands 1, 1 'and on the other hand is uncoiled by the reel 2. The following is the case that occurs at the beginning of the rolling process. In this case, the term "start of the rolling process" refers to the time until the time when the reel 2 grips the band 4. During the above period, it is possible that the expiring from the last main rolling stand 1 'band 4 migrates laterally. In order to prevent such lateral emigration, the control device 3 controls the last main rolling stand 1 'accordingly. In particular, the

Steuereinrichtung 3 das letzte Hauptwalzgerüst 1' derart ansteuern, dass die Arbeitswalzen 5' dieses Hauptwalzgerüsts 1' in Bandlaufrichtung x gesehen gegeneinander verschwenkt werden. Alternativ oder zusätzlich ist es möglich, dass die Steuereinrichtung 3 das letzte Hauptwalzgerüst 1' derart ansteuert, dass die Arbeitswalzen 5' dieses Hauptwalzgerüsts 1' in Banddickenrichtung gesehen ein Keilprofil bilden. Durch eine und auch durch beide Maßnahmen kann bewirkt werden, dass das Band 4 aus dem letzten Hauptwalzgerüst 1' gerade aus- läuft.Control device 3, the last main rolling mill 1 'drive such that the work rolls 5' of this main rolling stand 1 'seen in the tape running direction x are pivoted against each other. Alternatively or additionally, it is possible for the control device 3 to actuate the last main rolling stand 1 'in such a way that the work rolls 5' of this main rolling stand 1 'form a wedge profile viewed in the strip thickness direction. By one and also by both measures can be made that the belt 4 from the last main rolling mill 1 'straight running.

Die erfindungsgemäßen Ausgestaltungen weisen viele Vorteile auf. Insbesondere ist es möglich, auch bestehende Walzstraße so nachzurüsten, dass sie zumindest in einer Vielzahl von Fällen (nämlich dann, wenn die Gesamtstichabnahme A klein genug ist) auf die erfindungsgemäße Weise betreibbar sind.The embodiments according to the invention have many advantages. In particular, it is also possible to retrofit existing rolling mills in such a way that they can be operated in the manner according to the invention, at least in a large number of cases (namely, when the total stitch loss A is small enough).

Die obige Beschreibung dient ausschließlich der Erläuterung der vorliegenden Erfindung. Der Schutzumfang der vorliegenden Erfindung soll hingegen ausschließlich durch die beigefügten Ansprüche bestimmt sein. The above description is only for explanation of the present invention. The scope of the present invention, however, is intended to be determined solely by the appended claims.

Claims

Patentansprüche claims 1. Betriebsverfahren für eine Walzstraße zum Walzen eines Bandes (4), insbesondere eines Metallbandes (4), - wobei die Walzstraße mehrere Hauptwalzgerüste (1, 1') und einen den Hauptwalzgerüsten (1, 1') nachgeordneten Haspel (2) aufweist,1. Operating method for a rolling train for rolling a belt (4), in particular a metal strip (4), - wherein the rolling mill has a plurality of main rolling stands (1, 1 ') and a main rolling stands (1, 1') downstream reel (2), - wobei die Hauptwalzgerüste (1, 1') jeweils Arbeitswalzen- Wherein the main rolling stands (1, 1 ') each work rolls (5, 5') und zumindest Stützwalzen (6, 6') aufweisen, - wobei einer Steuereinrichtung (3) der Walzstraße Daten(5, 5 ') and at least supporting rollers (6, 6'), - wherein a control device (3) of the rolling mill data (d-in, d-out, b, T) des Bandes (4) zugeführt werden, die zumindest eine von Null verschiedene Gesamtstichabnahme (A) festlegen, um welche eine Anfangsdicke (d-in) des Bandes (4) in der Walzstraße reduziert werden soll, - wobei die Steuereinrichtung (3) anhand der ihr zugeführten Daten für die Hauptwalzgerüste (1, 1') Einzelstichabnahmen (a, a' ) ermittelt,(d-in, d-out, b, T) of the strip (4) are set, which determine at least a non-zero total die decrease (A) by which an initial thickness (d-in) of the strip (4) in the rolling train to be reduced, - whereby the control device (3) determines single-stitch decreases (a, a ') on the basis of the data supplied to it for the main rolling stands (1, 1'), - wobei die Steuereinrichtung (3) die Hauptwalzgerüste (1, 1') und den Haspel (2) derart steuert, dass das Band (4) in den Hauptwalzgerüsten (1, 1') entsprechend den ermittelten Einzelstichabnahmen (a, a' ) gewalzt und sodann vom Haspel (2) aufgehaspelt wird, dadurch gekennzeichnet,wherein the control device (3) controls the main rolling stands (1, 1 ') and the reel (2) in such a way that the strip (4) in the main rolling stands (1, 1') is rolled in accordance with the determined single-stitch decreases (a, a ') and then reeled by the reel (2), characterized - dass die Steuereinrichtung (3) die Einzelstichabnahmen (a, a' ) derart ermittelt, dass die Einzelstichabnahme (a' ) des dem Haspel (2) unmittelbar vorgeordneten Hauptwalzgerüsts (1') Null ist, und- That the control device (3) determines the single stitch decreases (a, a ') such that the single stitch decrease (a') of the reel (2) immediately upstream main rolling stand (1 ') is zero, and - dass die Steuereinrichtung (3) das dem Haspel (2) unmittelbar vorgeordnete Hauptwalzgerüst (1') derart steuert, dass - bezogen auf dieses Hauptwalzgerüst (1') - der auslaufsei- tige Zug (Za) im Band (4) kleiner als der einlaufseitige Zug (Ze) ist, das Band (4) jedoch dieses Hauptwalzgerüst (1') zumindest einseitig umformungsfrei durchläuft.- That the control device (3) the main reel stand (1 ') directly upstream of the reel (2) controls such that - related to this main rolling stand (1') - the outgoing train (Za) in the band (4) is smaller than that inlet-side train (Ze) is, the band (4) but this main roll stand (1 ') at least on one side passes through without deformation. 2. Betriebsverfahren nach Anspruch 1, dadurch gekennzeichnet, dass das Band (4) ein Schmalband ist. 2. Operating method according to claim 1, characterized in that the band (4) is a narrow band. 3. Betriebsverfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Band (4) vor dem Walzen in der Walzstraße ein Keilprofil aufweist.3. Operating method according to claim 1 or 2, characterized in that the strip (4) before rolling in the rolling train has a spline. 4. Betriebsverfahren nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, dass die Steuereinrichtung (3) das dem Haspel (2) unmittelbar vorgeordnete Hauptwalzgerüst (1') derart ansteuert, dass das Band (4) dieses Hauptwalzgerüst (1') über seine gesamte Breite (b) umformungsfrei durchläuft.4. Operating method according to claim 1, 2 or 3, characterized in that the control device (3) that the reel (2) immediately upstream main rolling stand (1 ') controls such that the band (4) of this main rolling stand (1') on his entire width (b) passes without deformation. 5. Betriebsverfahren nach einem der obigen Ansprüche, dadurch gekennzeichnet, dass die Steuereinrichtung (3) das dem Haspel (2) unmittelbar vorgeordnete Hauptwalzgerüst (1') zumindest zu Beginn des Walzens des Bandes (4) derart ansteuert, dass zumindest die Arbeitswalzen (5') dieses Hauptwalzgerüsts (1') in Bandlaufrichtung (x) gesehen derart gegeneinander verschwenkt und/oder in Banddickenrichtung gesehen in einem Keilprofil derart angestellt werden, dass das Band (4) aus diesem Hauptwalzgerüst (1') gerade ausläuft.5. Operating method according to one of the above claims, characterized in that the control device (3) the reel (2) immediately upstream main rolling stand (1 ') at least at the beginning of the rolling of the belt (4) such that at least the work rolls (5 ') of this main rolling stand (1') in the strip running direction (x) as seen pivoted against each other and / or seen in the strip thickness direction in a spline be made such that the strip (4) from this main roll stand (1 ') just expires. 6. Betriebsverfahren nach einem der obigen Ansprüche, dadurch gekennzeichnet, dass das Band (4) in der Walzstraße kaltgewalzt wird.6. Operating method according to one of the above claims, characterized in that the strip (4) is cold rolled in the rolling mill. 7. Betriebsverfahren nach einem der obigen Ansprüche, dadurch gekennzeichnet, dass die Anzahl an Hauptwalzgerüsten (1, 1') mindestens vier beträgt .7. Operating method according to one of the above claims, characterized in that the number of main rolling stands (1, 1 ') is at least four. 8. Betriebsverfahren nach einem der obigen Ansprüche, dadurch gekennzeichnet, dass die Steuereinrichtung (3) das dem Haspel (2) unmittelbar vorgeordnete Hauptwalzgerüst (1') walzkraftgeregelt steuert und dass die Steuereinrichtung (3) eine Sollwalzkraft (F'*) dieses Hauptwalzgerüsts (1') derart ermittelt, dass das Band (4) dieses Hauptwalzgerüst (1') umformungsfrei durchläuft.8. Operating method according to one of the above claims, characterized in that the control device (3) controls the reel (2) directly upstream main rolling stand (1 ') with rolling force control and that the control device (3) a Sollwalzkraft (F' *) of this main rolling stand (1 ') determined such that the band (4) of this main rolling stand (1') passes through without deformation. 9. Steuerprogramm für eine Steuereinrichtung (3) einer WaIz- Straße, wobei die Walzstraße mehrere Hauptwalzgerüste (1, 1') und einen den Hauptwalzgerüsten (1, 1') nachgeordneten Haspel (2) aufweist und die Hauptwalzgerüste (1, 1') jeweils Arbeitswalzen (5, 5') und zumindest Stützwalzen (6, 6') aufweisen, wobei das Steuerprogramm Maschinencode (10) umfasst, dessen Ausführung durch die Steuereinrichtung (3) bewirkt, dass die Steuereinrichtung (3) die Walzstraße gemäß einem Betriebsverfahren nach einem der obigen Ansprüche betreibt.9. control program for a control device (3) of a WaIz- road, said rolling mill having a plurality of main rolling stands (1, 1 ') and a main rolling stands (1, 1') downstream reel (2) and the main rolling stands (1, 1 ') Work rolls (5, 5 ') and at least back-up rolls (6, 6'), the control program comprising machine code (10) whose execution by the control device (3) causes the control device (3) to move the rolling mill in accordance with an operating method operates one of the above claims. 10. Datenträger, auf dem in maschinenlesbarer Form ein Steu- erprogramm (8) nach Anspruch 9 gespeichert ist.10. Data carrier on which a control program (8) according to claim 9 is stored in machine-readable form. 11. Steuereinrichtung für eine Walzstraße, wobei die Walzstraße mehrere Hauptwalzgerüste (1, 1') und einen den Hauptwalzgerüsten (1, 1') nachgeordneten Haspel (2) aufweist und die Hauptwalzgerüste (1, 1') jeweils Arbeitswalzen (5, 5') und zumindest Stützwalzen (6, 6') aufweisen, wobei die Steuereinrichtung derart ausgebildet ist, dass sie die Walzstraße gemäß einem Betriebsverfahren nach einem der Ansprüche 1 bis 8 betreibt.11. Control device for a rolling train, wherein the rolling mill has a plurality of main rolling stands (1, 1 ') and a main rolling stands (1, 1') downstream reel (2) and the main rolling stands (1, 1 ') each work rolls (5, 5' ) and at least supporting rollers (6, 6 '), wherein the control device is designed such that it operates the rolling train according to an operating method according to one of claims 1 to 8. 12. Walzstraße mit mehreren Hauptwalzgerüsten (1, 1' ) , einem den Hauptwalzgerüsten (1, 1') nachgeordneten Haspel (2) und einer Steuereinrichtung (3), wobei die Hauptwalzgerüste (1, 1') jeweils Arbeitswalzen (5, 5') und zumindest Stützwalzen (6, 6') aufweisen, wobei die Steuereinrichtung (3) gemäß Anspruch 11 ausgebildet ist. 12. rolling mill with several main rolling mills (1, 1 '), a main mills (1, 1') downstream reel (2) and a control device (3), wherein the main mills (1, 1 ') each work rolls (5, 5' ) and at least support rollers (6, 6 '), wherein the control device (3) is designed according to claim 11.
EP08774590.7A 2007-07-05 2008-07-01 Rolling of a strip in a rolling train using the last stand of the rolling train as a tension reducer Not-in-force EP2162245B1 (en)

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* Cited by examiner, † Cited by third party
Title
See references of WO2009004005A1 *

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PL2162245T3 (en) 2013-09-30
EP2162245B1 (en) 2013-04-24
CN101687235B (en) 2012-07-04
WO2009004005A1 (en) 2009-01-08
US8676371B2 (en) 2014-03-18
US20100193623A1 (en) 2010-08-05
RU2010103790A (en) 2011-08-10
CN101687235A (en) 2010-03-31
BRPI0814648A2 (en) 2015-03-10
DE102007031333A1 (en) 2009-01-15
RU2461435C2 (en) 2012-09-20

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