EP4272884A1 - Determination of the lateral offset of a metal strip on the basis of the contour of a side face of the coil - Google Patents

Abstract

A rolling mill has at least one roll stand (1) and a decoiler (2) arranged upstream of the roll stand (1). A metal strip (4) coiled into a coil (3) is unwound from the uncoiler (2) and fed from there to the roll stand (1). The metal strip (4) is rolled in the rolling stand (1). A respective section (i) of the metal strip (4) has a respective lateral offset (V) at a predetermined distance in front of the rolling stand (1). A control device (8) for the roll stand (1) determines a respective manipulated variable (C) for at least one actuator (12) assigned to the roll stand (1) by utilizing the respective lateral offset (V) and controls the actuator (12) in accordance with the determined value respective manipulated variable (C). Before the metal strip (4) is uncoiled, the control device (8) is aware of a contour (K) of at least one end face (11) of the coil (3). The control device (8) determines the respective lateral offset (V) using the contour (K).

Description

field of technology

• wobei in der Walzanlage ein zu einem Coil gehaspeltes Metallband von dem Abhaspel abgehaspelt wird, von dort aus dem Walzgerüst zugeführt wird und in dem Walzgerüst gewalzt wird,
• wobei eine Steuereinrichtung für das Walzgerüst unter Verwertung eines jeweiligen seitlichen Versatzes, den ein jeweiliger Abschnitt des Metallbandes in einem vorbestimmten Abstand vor dem Walzgerüst aufweist, für mindestens ein dem Walzgerüst zugeordnetes Stellglied eine jeweilige Stellgröße ermittelt und das Stellglied entsprechend der ermittelten jeweiligen Stellgröße ansteuert.

The present invention is based on an operating method for a rolling mill which has at least one roll stand and an uncoiler arranged upstream of the roll stand,

• wherein in the rolling mill a metal strip coiled into a coil is uncoiled from the uncoiler, from there is fed to the rolling stand and is rolled in the rolling stand,
• wherein a control device for the roll stand, using a respective lateral offset that a respective section of the metal strip has at a predetermined distance in front of the roll stand, determines a respective manipulated variable for at least one actuator assigned to the roll stand and controls the actuator in accordance with the determined respective manipulated variable.

The present invention is further based on a control program for a control device of a rolling stand for rolling a metal strip, the control program comprising machine code that can be processed by the control device, the processing of the machine code by the control device causing the control device to be operated in accordance with such an operating method.

The present invention is further based on a control device for a roll stand of a rolling mill, the control device being programmed with such a control program so that the control device executes such a control program during operation.

The present invention is further based on a rolling mill which has at least one roll stand, an uncoiler arranged upstream of the roll stand and a control device for the roll stand.

State of the art

Such an operating procedure is, for example, from DE 34 13 269 C2 known.

Summary of the invention

When rolling a metal strip, the rolled metal strip often migrates laterally, i.e. it migrates in the width direction of the metal strip. Such migration can occur both on the input side of a roll stand and on the output side of a roll stand. As a result, in a multi-stand rolling train, it can also be done between the individual stands of the rolling train.

Small lateral movements are often unproblematic. However, in the case of larger lateral movements, it can occur that the metal strip hits a side guide and this causes a so-called high walk-up. Furthermore, the lateral migration movements influence quality parameters of the rolled metal strip such as the profile, the flatness and also a thickness wedge. This also applies to smaller lateral movements of the metal strip.

It is known in the prior art to detect the lateral offset of the metal strip on the outlet side of the roll stand - for example by means of a camera - and to set a manipulated variable for an actuator of the roll stand depending on the offset detected on the outlet side. As an example, you can refer to: EP 3 202 502 A1 to get expelled.

It is also already known to detect the lateral offset of the metal strip on the inlet side of the roll stand and to set a manipulated variable for an actuator of the roll stand depending on the offset detected on the inlet side. As a purely example, you can refer to the one already mentioned DE 34 13 269 C2 to get expelled.

At the DE 34 13 269 C2 On the inlet side of the roll stand, the lateral offset of this section of the metal strip is recorded for an individual section and used as part of a conventional control (for example a proportional control).

The procedure of the DE 34 13 269 C2 is only practical if the metal strip is in the form of a flat metal strip, i.e. not in the coiled state of the metal strip.

The object of the present invention is to create options by means of which it is possible to take the lateral offset of a respective section of the metal strip into account even when the metal strip has been coiled into a coil and is uncoiled in the rolling stand before the metal strip is rolled.

The task is solved by an operating method with the features of claim 1. Advantageous refinements of the operating method are the subject of dependent claims 2 to 4.

According to the invention, an operating method of the type mentioned at the outset is designed in that a contour of at least one end face of the coil is known to the control device before the metal strip is uncoiled and in that the control device determines the respective lateral offset using the contour.

The actuator can in particular be an actuator by means of which an asymmetrical adjustment of the roll gap is carried out can be. This means that the lateral belt movement can be influenced directly. A typical example of such an actuator is a wedge adjustment of the roll gap. Alternatively or additionally, manipulated variables can also be determined for other actuators, in particular for actuators which only have a local or a global but symmetrical influence on the profile and flatness of the metal strip. A typical example of an actuator that is only locally effective is a cooling device that only acts on a single section of a work roll when viewed in the width direction of the metal strip. A typical example of an actuator that acts globally but symmetrically is a roll bend. Another typical example is a roller shift.

In the simplest case, the manipulated variable is determined in the sense of a usual target/actual control, for example using a P controller, a PI controller or a PID controller. Due to the fact that the course of the lateral offset is already known in advance over the entire length of the metal strip due to the contour of the end face, more complex controls are also possible, for example a model-predictive control. Furthermore, other predictive consideration of the course of the lateral offset is also possible. For example, an offline optimization of the manipulated variable can be carried out in advance over the entire strip length.

As a rule, only the contour of a single end face of the coil is known to the control device. In this case, the control device can only determine the lateral offset - assuming that the width of the metal strip is constant over the length of the metal strip. Alternatively, however, it is also possible for the control device to become aware of the contours of both end faces of the coil. In this case, the control device can not only determine the respective lateral offset, but also, for example, for the individual sections of the metal strip determine the respective width of the metal strip and take it into account when controlling the roll stand. This is particularly advantageous if the width of the metal strip can be influenced by means of the actuator. In particular in this case, the actuator can be an actuator of the roll stand as such or an actuator assigned to the roll stand, for example a loop lifter arranged upstream or downstream of the roll stand or an upsetter arranged upstream or downstream of the roll stand.

In principle, the contour of the end face can be detected at any time after the metal strip has been coiled into the coil, in particular immediately after coiling or at another time between coiling and feeding to the uncoiler. Preferably, however, the contour of the end face is detected by means of a detection device assigned to the uncoiler while the coil is already in the uncoiler, and then fed to the control device. As a result, the execution of the operating method is tied to a smaller extent to data supplied or provided from outside.

The detection device can be, for example, a thermal imaging camera or a camera that works with light in the visible range, by means of which conventional two-dimensional images are captured. It can also be a camera that is used to capture depth images. It is also possible to design the detection device as a laser scanner, by means of which the contour of the end face is scanned. Other configurations are also possible. All of the types of detection devices mentioned are generally known to those skilled in the art.

In a preferred embodiment of the operating method, the contour of the end face of the coil is known to the control device in the form of a contour line running from radially inside to radially outside, based on the end face of the coil. The contour line thus indicates the lateral position of the captured Strip edge as a function of the distance from the eye of the coil. In this case, the control device determines the respective lateral offset using the contour line.

Alternatively, it is possible for the contour of the end face of the coil to be known to the control device in the form of a two-dimensional contour surface based on the end face of the coil. In this case, direct utilization of the two-dimensional contour surface is of course possible. In this case, however, the control device preferably uses the contour surface to determine a contour line that runs from radially inside to radially outside, based on the end face of the coil, and further determines the respective lateral offset using the contour line, but not the two-dimensional contour surface as such. As before, the contour line indicates the lateral position of the detected strip edge as a function of the distance from the eye of the coil.

By using the contour line, the computational effort required to determine the respective lateral offset is significantly reduced.

Due to the contour line, the control device initially knows the offset of a respective section of the metal strip at a current coil radius (= current location on the radial contour line). Seen in the longitudinal direction of the metal strip, this location corresponds to a support point. The distance to the next support point is determined by the current coil radius (multiplied by the factor 2π). The new coil radius is determined by the current coil radius and the thickness of the coiled metal strip. When working from the outside to the inside, the coil radius is reduced, so the thickness of the coiled metal strip is subtracted. When working from the inside to the outside, the coil radius increases, so the thickness of the coiled metal strip is added. The control device is therefore only able to offset the corresponding sections of the metal strip at support points through the contour line known, which follow one another in the longitudinal direction of the band. The support points are not equidistant because the coil radius varies. But this is of secondary importance.

It is possible that the sections of the metal strip are defined as such by the support points, i.e. a 1:1 assignment is made. Alternatively, it is also possible to carry out interpolation as required. The interpolation can be linear or non-linear as required.

As part of the operating method according to the invention, the metal strip can be rolled cold or hot in the rolling stand as required. Particularly during hot rolling, the rolling mill can be designed, for example, as a Steckelmill. In cold rolling, however, the roll stand can in particular be the front roll stand of a tandem train.

• dass der Steuereinrichtung vor dem Abhaspeln des Metallbandes von einem dem Walzgerüst vorgeordneten Abhaspel eine Kontur mindestens einer Stirnseite des Coils bekannt wird,
• dass die Steuereinrichtung unter Verwertung der Kontur für Abschnitte des Metallbandes einen jeweiligen seitlichen Versatz ermittelt, den der jeweilige Abschnitt in einem vorbestimmten Abstand vor dem Walzgerüst aufweist, und
• dass die Steuereinrichtung unter Verwertung des jeweiligen seitlichen Versatzes für mindestens ein dem Walzgerüst zugeordnetes Stellglied eine jeweilige Stellgröße ermittelt und das Stellglied entsprechend der ermittelten jeweiligen Stellgröße ansteuert.

The task is further solved by a control program with the features of claim 5. According to the invention, the processing of the control program by the control device causes

• that the control device becomes aware of a contour of at least one end face of the coil before the metal strip is uncoiled from an uncoiler arranged upstream of the roll stand,
• that the control device uses the contour for sections of the metal strip to determine a respective lateral offset that the respective section has at a predetermined distance in front of the rolling stand, and
• that the control device determines a respective manipulated variable by utilizing the respective lateral offset for at least one actuator assigned to the roll stand and controls the actuator in accordance with the determined respective manipulated variable.

The control program can also be designed in an advantageous manner. The configurations of the control program correspond to the advantageous configurations of the operating procedure. The same applies to the advantages achieved as a result.

The task is further solved by a control device with the features of claim 8. According to the invention, the control device is programmed with a control program according to the invention, so that the control device executes the control program according to the invention during operation.

The task is further solved by a rolling mill with the features of claim 9. According to the invention, in a rolling mill of the type mentioned at the outset, the control device is designed as a control device according to the invention.

Preferably, the uncoiler is assigned a detection device, by means of which the contour of the end face is detected while the coil is already in the uncoiler, and is then fed to the control device. As a result, the operation of the rolling mill according to the invention is tied to a smaller extent to data supplied or provided from outside.

The rolling stand of the rolling mill can be designed as a hot rolling stand or as a cold rolling stand as required. In the former case, the rolling mill can in particular be designed as a Steckelmill. In the latter case, the roll stand can in particular be the front roll stand of a multi-stand tandem train.

Brief description of the drawings

FIG 1

eine Walzanlage,

FIG 2

eine weitere Walzanlage,

FIG 3

ein Ablaufdiagramm,

FIG 4

einen Schnitt längs einer Linie IV-IV in den FIG 1 und 2,

FIG 5

ein Ablaufdiagramm,

FIG 6

eine perspektivische Darstellung einer Stirnfläche eines Coils und

FIG 7

ein Ablaufdiagramm.

The characteristics, features and advantages of this invention described above, as well as the manner in which these are achieved, will be more clearly and clearly understood in connection with the following description of the exemplary embodiments, which will be explained in more detail in connection with the drawings. This shows in a schematic representation:

FIG 1

a rolling mill,

FIG 2

another rolling mill,

FIG 3

a flowchart,

FIG 4

a cut along a line IV-IV in the FIGS. 1 and 2 ,

FIG 5

a flowchart,

FIG 6

a perspective view of an end face of a coil and

FIG 7

a flowchart.

Description of the embodiments

According to FIG 1 a rolling mill has a roll stand 1. Only the work rolls of the roll stand 1 are shown. In the design according to FIG 1 Roll stand 1 is the only roll stand in the rolling mill. A decoiler 2 is arranged upstream of the roll stand 1. A coil 3 is uncoiled from the uncoiler 2, i.e. a coiled metal strip 4. The uncoiled metal strip 4 is fed to the roll stand 1, starting from the uncoiler 2. The metal strip 4 is rolled in the rolling stand 1. The coil 3 can have been fed to the uncoiler 2 as such, i.e. as previously reeled onto the metal strip 4 elsewhere. Alternatively, the metal strip 4 can have been reeled into the coil 3 itself from the uncoiler 2 before unwinding.

In accordance with the design FIG 1 There is also a reel 5 downstream of the roll stand 1. The metal strip 4 is wound up from the reel 5 after rolling in the roll stand 1. As a rule, a rolling mill is operated in accordance with FIG 1 in such a way that the metal strip 4 is rolled in a reversing manner in the rolling stand 1, so that end pieces of the metal strip 4 are not also rolled. The uncoiler 2 and the reeler 5 therefore change their respective functionality with each rolling pass. In particular, in such an embodiment, the metal strip 4 is alternately wound up by one and the same reel 2, 5 and then unwound again.

The rolling mill according to FIG 1 can in particular be designed as a Steckelmill. The metal strip 4 is hot rolled in a Steckelmill. In this case, the roll stand 1 is designed as a hot roll stand. However, hot rolling of the metal strip 4 is also possible with other configurations of the rolling system. For example, hot rolling of the metal strip 4 can also take place in a multi-stand hot rolling train, in which the uncoiler 2 is arranged upstream of the hot rolling train. The rolling train can also be designed as in FIG 1 shown, the roll stand 1 can be a roughing stand.

FIG 2 shows an alternative design of a rolling mill. According to FIG 2 In addition to the rolling stand 1, the rolling mill has further rolling stands 6. In this case, the rolling stand 1 is the front rolling stand of a multi-stand rolling train. The rolling stands 1, 6 are analogous to FIG 1 only the work rolls shown.

Also in terms of design FIG 2 The roll stand 1 is preceded by a decoiler 2. A coil 3 is fed to the uncoiler 2, i.e. a previously coiled metal strip 4. The metal strip 4 is uncoiled from the uncoiler 2 and from there fed to the roll stand 1 (and then to the other roll stands 6). The metal strip 4 is rolled in the roll stand 1 (and also the other roll stands 6).

As already mentioned, the design can also be done according to FIG 2 the metal strip 4 is hot rolled. According to FIG 2 However, an S-roller set 7 is arranged between the uncoiler 2 and the roll stand 1. Such a configuration is particularly common in a multi-stand tandem line in which cold rolling of the metal strip 4 takes place. However, cold rolling of the metal strip 4 is also possible with other configurations of the rolling system.

Both in the rolling mill according to FIG 1 as well as in the rolling mill FIG 2 At least the rolling stand 1 (usually the entire rolling mill) is controlled by a control device 8 controlled. The control device 8 is programmed with a control program 9, so that the control device 8 executes the control program 9 during operation. The control program 9 includes machine code 10, which can be processed by the control device 8. The processing of the machine code 10 by the control device 8 causes the control device 8 to operate at least the rolling stand 1 - as already mentioned: usually the entire rolling mill - according to an operating method, which is described below in connection with FIG 3 is explained in more detail.

According to FIG 3 In a step S1, the control device 8 becomes aware of a contour K of at least one of the two end faces 11 of the coil 4. It is also possible for the control device 8 to become aware of the contours K of both end faces 11 of the coil 4 in step S1. As a rule, however, the contour K of one of the two end faces 11 is sufficient. This case is therefore assumed below. Step S1 is carried out by the control device 8 before the metal strip 4 is uncoiled.

In a step S2, the control device 8 determines a respective lateral offset V for sections i (i = 1, 2, 3, ...) of the metal strip 4. The respective offset V can therefore vary across sections i. The offset V, viewed in the width direction of the metal strip 4, corresponds to the deviation of the center line of the metal strip 4 from the center line of the roll stand 1. The offset V of the respective section i is determined for a predetermined distance that the respective section i has from the roll stand 1. He The offset V is determined using the contour K.

The predetermined distance can be determined as needed. In particular, it can be the place where the metal strip 4 detaches from the remaining part of the coil 3. This determination of the predetermined distance can be particularly useful if there is between the uncoiler 2 and the There are no devices in the roll stand 1 that influence or hinder lateral movements of the metal strip 1. But it could also be another location. For example, in the case of the design of FIG 2 The predetermined distance can be determined by the location of the S-roller set 7. Which location is chosen depends on the circumstances of the individual case.

In a step S3, the control device 8 determines a respective manipulated variable C for at least one actuator 12. The actuator 12 can be an actuator of the roll stand 1 as such, for example acting locally or globally on the roll gap. Alternatively, the actuator 12 can be arranged upstream or downstream of the roll stand 1. The determination of the respective manipulated variable C applies to the respective section i of the metal strip 4. The respective manipulated variable C is determined by the control device 8 using the respective lateral offset V. Suitable actuators 12, suitable manipulated variables C and suitable determination methods are known to those skilled in the art. In a step S4, the control device 8 controls the actuator 12 in accordance with the determined respective manipulated variable C.

Step S1 is carried out only once, namely once before the metal strip 4 is fed to the rolling stand 1. Step S4 is carried out iteratively again and again, namely for an individual section i of the metal strip 4. Steps S2 and S3 can either only be carried out once or be carried out iteratively again and again. Which approach is taken with regard to steps S2 and S3 is at the discretion of the person skilled in the art. It will often be advantageous to carry out step S2 together with step S1, i.e. once in advance, and to carry out step S3 together with step S4, i.e. iteratively over and over again.

The manner in which the contour K of the end face 11 becomes known to the control device 8 can be determined as required. For example, it is possible that the contour K the control device 8 is specified by an operator or by a higher-level control device. Preferably, however, the uncoiler 2 is assigned a detection device 13, by means of which the contour K of the end face 11 is detected while the coil 3 is already in the uncoiler 2. In this case, the detection device 13 supplies the detected contour K to the control device 8. The control device 8 receives the detected contour K from the detection device 13. In this way, the contour K of the control device 8 becomes known.

The following is in connection with the FIG 4 and 5 determines a preferred manner in which the contour K can be made available to the control device 8.

FIG 4 shows a section along a line IV-IV in the FIGS. 1 and 2 . According to FIG 4 the coil 3 has a coil eye 14. The coil eye 14 has a diameter D1. R1 = D1/2 is therefore the minimum radius of the coil 3. The coil 3 also has an outside diameter D2. R2 = D2/2 is therefore the maximum radius of the coil 3. The metal strip 4 has a thickness d. The individual turns 15 of the coil 3 are each spaced apart from one another by the thickness d of the metal strip 4 in the radial direction of the coil 3 (i.e. seen from the inside to the outside or, conversely, from the outside to the inside). Furthermore, the individual turns 15 of the coil 3 are slightly offset from one another laterally (i.e. seen in the width direction of the metal strip 4). The contours K of the end faces 11 follow the slight lateral offset of the turns 15. Along the cutting line IV-IV (see FIG 1 and FIG 2 ) seen, a contour line KL results with respect to the corresponding end face 11 of the coil 3, which describes the offset of the turns 15 as a function of the current coil radius r in the range from R1 to R2, i.e. from radially inside to radially outside (or vice versa). A completely analogous contour line KL would also result if the cutting line through the coil 3 were placed differently.

It is appropriate FIG 5 possible that the control device 8 receives the contour K of the end face 11 of the coil 3 in a step S11 in the form of such a contour line KL.

The location of the outermost turn 15 corresponds to the beginning of the metal strip 4. The value of the contour line KL at this point corresponds to the offset of the frontmost section i = 1 of the metal strip 4. The radius r for the next inner turn 15 can easily be obtained by subtracting the thickness d of the Metal strip 4 of radius r can be determined. At this point on the metal strip 4, the contour line KL can be evaluated again by the control device 8. This procedure can be repeated gradually for all turns 15 of the metal strip 4. Thus, in a step S12, the control device 8 can gradually determine the lateral offset of the metal strip 4 at this point for all turns 15 and thus for support points that are spaced apart from one another by a distance of 2nr (where the current coil radius r is variable). determine. This results in a functional course for the lateral offset of the metal strip 4 over the entire length of the metal strip 4. Based on this offset, the lateral offset V for the sections i can easily be determined.

In the simplest case, the sections i are determined by the support points. In this case, the sections i are not the same size. If the sections i should be the same size or should meet a different criterion, interpolation between neighboring support points can be carried out as required.

Steps S11 and S12 therefore correspond to a possible implementation of steps S1 and S2 FIG 3 .

The following is in connection with the FIG 6 and 7 Another preferred way determines the contour K can be made available to the control device 8.

FIG 6 shows a perspective view of an end face 11 of the coil 3. Using suitable detection devices 13, it is easily possible to determine a contour surface KF, which, so to speak, reflects the three-dimensional "offset mountains" over the entire end face 11. For example, if the detection device 13 is designed as a laser scanner, a two-dimensional scanning of the entire end face 11 can take place. However, other approaches are also possible.

It is appropriate FIG 7 It is possible for the control device 8 to receive the contour K of the end face 11 of the coil 3 in the form of such a contour surface KF in a step S21. In this case, the control device 8 can, for example, determine a contour line KL based on the contour surface KF in a step S22. In particular, the control device 8 can select and evaluate a narrow strip of the contour surface KF that runs from radially inside to radially outside. In a step S23, the control device 8 can then determine the respective lateral offset V of the sections i using the contour line KL. The contour surface KF itself is no longer required to carry out step S23. Thus, step S23 can be carried out by FIG 7 in terms of content, in particular with step S12 of FIG 5 correspond.

Steps S21 to S23 correspond to a further possible implementation of steps S1 and S2 FIG 3 .

The present invention has many advantages. By detecting the contour K of an end face 11, the information for the lateral offset V of the sections i is available in a simple manner over the entire length of the metal strip 4. This means that superior control algorithms in particular can be implemented. By recording directly at the unwinder 2 is an independent recording that is not based on external input. Furthermore, it is guaranteed that effects that occur before unwinding are reliably recognized and taken into account. The solutions according to the invention are simple, robust and reliable and can also be retrofitted into existing rolling mills.

Although the invention has been illustrated and described in detail by the preferred embodiment, the invention is not limited by the examples disclosed and other variations may be derived therefrom by those skilled in the art without departing from the scope of the invention.

Reference symbol list

1

Roll stand

2

Uncoiler

3

Coil

4

metal band

5

reel

6

further rolling stands

7

S roller set

8th

Control device

9

Tax program

10

Machine code

11

End faces

12

actuator

13

Detection device

14

Coil eye

15

convolutions

C

manipulated variable

D1, D2

diameter

d

Band thickness

i

Sections of metal strip

K

contour

KF

contour surface

KL

contour line

R1, R2, r

radii

S1 to S23

steps

v

offset

Claims (11)

Operating method for a rolling mill which has at least one roll stand (1) and a decoiler (2) arranged upstream of the roll stand (1), - whereby in the rolling mill a metal strip (4) coiled into a coil (3) is uncoiled from the uncoiler (2), from there it is fed to the rolling stand (1) and is rolled in the rolling stand (1), - wherein a control device (8) for the roll stand (1) using a respective lateral offset (V), which a respective section (i) of the metal strip (4) has at a predetermined distance in front of the roll stand (1), for at least one The actuator (12) assigned to the roll stand (1) determines a respective manipulated variable (C) and controls the actuator (12) in accordance with the determined respective manipulated variable (C), characterized,
that the control device (8) becomes aware of a contour (K) of at least one end face (11) of the coil (3) before the metal strip (4) is uncoiled and that the control device (8) determines the respective lateral offset (V) using the contour (K) determined. Operating method according to claim 1,
characterized,
that the contour (K) of the end face (11) is detected by means of a detection device (13) assigned to the uncoiler (2), while the coil (3) is already in the uncoiler (2), and then fed to the control device (8). becomes. Operating method according to claim 1 or 2,
characterized, - that the contour (K) of the end face (11) of the coil (3) of the control device (8) is in the form of a contour line (KL) running from radially inside to radially outside, based on the end face (11) of the coil (3). becomes known and that the Control device (8) determines the respective lateral offset (V) using the contour line (KL) or - that the contour (K) of the end face (11) of the coil (3) of the control device (8) in the form of a two-dimensional contour surface (KF) relative to the end face (11) of the coil (3) becomes known to the control device (8) uses the contour surface (KF) to determine a contour line (KL) that runs from radially inside to radially outside, based on the end face (11) of the coil (3), and that the control device (8) determines the respective lateral offset (V) determined using the contour line (KL), but not the two-dimensional contour surface (KF) as such. Operating method according to claim 1, 2 or 3,
characterized,
that the metal strip (4) is rolled cold or hot in the rolling stand (1). Control program for a control device (8) of a rolling stand (1) for rolling a metal strip (4), the control program comprising machine code (10) that can be processed by the control device (8), the processing of the machine code (10) being carried out by the control device (8) causes, - that the control device (8) becomes aware of a contour (K) of at least one end face (11) of the coil (3) before the metal strip (4) is uncoiled from an uncoiler (2) arranged upstream of the roll stand (1), - that the control device (8), using the contour (K), determines a respective lateral offset (V) for sections (i) of the metal strip (4), which the respective section (i) has at a predetermined distance in front of the rolling stand (1). has, and - that the control device (8) determines a respective manipulated variable (C) for at least one actuator (12) assigned to the roll stand (1) using the respective lateral offset (V) and the actuator (12) corresponds to the determined respective manipulated variable (C) controlled. Control program according to claim 5,
characterized,
that the processing of the machine code (10) by the control device (8) causes the control device (8) to receive the contour (K) of the end face (11) from a detection device (13) assigned to the unwinder (2) while the coil (3) is already in the uncoiler (2). Control program according to claim 5 or 6,
characterized,
that the processing of the machine code (10) by the control device (8) causes - that the control device (8) controls the contour (K) of the end face (11) of the coil (3) in the form of a contour line (KL) running from radially inside to radially outside, based on the end face (11) of the coil (3). receives and determines the respective lateral offset (V) using the contour line (KL) or - that the control device (8) receives the contour (K) of the end face (11) of the coil (3) in the form of a two-dimensional contour surface (KF) based on the end face (11) of the coil (3) and uses the contour surface ( KF) determines a contour line (KL) running from radially inside to radially outside, based on the end face (11) of the coil (3), and the respective lateral offset (V) using the contour line (KL), but not the two-dimensional contour surface (KF) determined. Control device for a roll stand (1) of a rolling mill, the control device being programmed with a control program (9) according to claim 5, 6 or 7, so that the control device executes the control program (9) during operation. Rolling plant, which has at least one roll stand (1), a decoiler (2) arranged upstream of the roll stand (1) and a control device (8) for the roll stand (1),
characterized,
that the control device (8) is designed as a control device according to claim 8. Rolling plant according to claim 9,
characterized,
that the uncoiler (2) is assigned a detection device (13), by means of which the contour (K) of the end face (11) is detected while the coil (3) is already in the uncoiler (2), and then the control device ( 8) is supplied. Rolling plant according to claim 9 or 10,
characterized,
that the rolling stand (1) is designed as a hot rolling stand, in particular the rolling mill is designed as a Steckelmill, or that the rolling stand (1) is designed as a cold rolling stand, in particular as the frontmost rolling stand of a multi-stand tandem train.

Images