JP7691230B2 - Improved fit of role models - Google Patents

Description

The invention starts from a storage device for two rolls of the same type in a roll stand, which is either a constituent part of the roll stand or can be positioned relative to the roll stand in such a way that the rolls can be transferred from the roll stand to the storage device or vice versa.

The present invention further features a method of operating a roll stand, comprising:
- the flat rolling stock passing through the roll stand is rolled between two rolls of the same type within the roll stand,
the automation unit controlling the roll stand repeatedly determines the temperature and/or diameter of the roll at least at a specific predefined position, as viewed in the direction of the roll axis, with the aid of a roll model using operational data of the roll stand for rolls of the same type, and determines the activation of the functions of the roll stand on the basis of the determined temperature and/or diameter, so that the rolling gap of the roll stand is set during the rolling of the flat rolling stock, as far as possible in accordance with the setpoint inputs;
- Rolls of the same type are removed from the roll stand from time to time and transferred to a roll change carriage.

During the rolling of metallic flat rolling stock, the rolling gap is usually calculated in the context of "Level-2" automation. Complex models are used to calculate the rolling gap, which take into account, for example, roll settings, roll bending, roll flattening, roll camber, roll wear, roll temperature, rolling stock temperature, and other factors. Some of the variables mentioned are specified as individual characteristics across the width of the roll barrel. Thus, for example, the higher the temperature of the roll at each location, the greater the thickness of the roll locally (the term "local" refers to the location as viewed in the direction of the roll axis). Conversely, the greater the wear or abrasion of the roll at each location, the thinner the roll locally becomes.

The smaller the rolling gap, the greater the absolute precision with which it must be calculated. For example, in the case of a rolling gap of 3 cm, an accuracy of 20 μm or 50 μm may be perfectly acceptable. In contrast, for example, in the case of a rolling gap of 1.2 mm, this type of precision is generally no longer acceptable.

As already mentioned, the rolling gap is influenced, inter alia, by the local temperature of the rolls. Moreover, the rolling gap is also influenced by the wear that the rolls are subjected to during operation. In addition, the temperature of the material of the flat rolling stock also depends, within certain limits, inter alia, on the temperature of the rolls during processing. The temperature of the rolling stock is an important criterion, for example, for the accurate determination of the rolling force. This applies both to hot rolling and to cold rolling.

Neither the temperature nor the wear or abrasion of the working rolls can be measured directly during rolling. For this reason, a roll model is used, which makes it possible to use otherwise measurable and known roll stand operating parameters and, with the aid of the model, to determine the temperature of the working rolls and the wear of the working rolls. A similar procedure may be adopted for other pairs of rolls in the roll stand, for example for the support rolls of a 4-high stand or for the intermediate rolls of a 6-high stand, which are located between the support rolls and the working rolls.

The models used to model the rolls and the rolling gap are prone to errors. The aim of the person skilled in the art is therefore to optimise the model. This applies in particular to the roll model.

The patent US 2005/0133993 discloses a method that allows for the determination of both the roll temperature and the roll wear in the case of rolls in a roll stand. The determination is carried out by determining the location in the direction of the roll axis.

U.S. Patent No. 5,393,633 and U.S. Patent No. 5,393,633 disclose procedures that allow the rolls in process in a roll stand to be changed while flat rolled stock is passing through the roll stand.

International Patent Publication No. 2012/025266 International Patent Publication No. 2017/144227 International Patent Publication No. 2011/124585

The object of the present invention is to provide the possibility of optimizing in a simple and reliable manner a roll model, which allows the determination of the temperature of the roll and its wear, and thus its diameter, from the determination of its location in the direction of the roll axis.

This object is achieved by means of a storage device having the features of claim 1. Advantageous improvements of the storage device form the subject matter of the dependent claims from claim 2 to claim 8.

According to the invention, a storage device of the type mentioned at the outset has at least one measuring system, with the aid of which the temperature and/or the diameter of the roll can be detected individually and independently of one another, at least at predefined detection positions, as viewed in the direction of the roll axis.

This makes it possible to detect the actual temperature and/or the actual diameter of the roll by measurement and thus compare them with the corresponding values determined with the help of the model and also to adapt the roll model based on this comparison.

As already mentioned, it is also possible, only as an exception, for the storage device to be an integral part of the roll stand. However, this configuration is generally only suitable in specific embodiments. Generally, however, the storage device is designed as a roll change carriage. In such a case, it is possible in a simple manner to ensure, inter alia, that the measuring system is not exposed to the rough movements of the roll stand, such as occur when rolling flat rolled stock.

For each roll, the measuring system has a number of measuring devices whose location is fixed relative to the body of the storage device, thereby making it possible to detect the temperature and/or diameter of the respective roll at one of the detection positions, which are in each case predefined, when viewed in the direction of the roll axis, using the measuring devices. In the case of such an embodiment, measuring devices capable of detecting the temperature and/or diameter of the respective roll at each position, when viewed in the direction of the roll axis, can be provided, for example, every 10 cm or every 20 cm.

As an alternative, for each roll, the measuring system has a number of measuring devices that are movable in the direction of the roll axis relative to the body of the storage device, thereby making it possible to detect, with the aid of the measuring devices, the temperature and/or the diameter of each roll in a respective subsection, as viewed in the direction of the roll axis, which in each case comprises at least one of the predefined detection positions. For example, the measuring devices may be movable to the left and right by in each case 5 cm, 8 cm, 12 cm or 15 cm from the central position of the respective measuring device, as viewed in the direction of the roll axis. In this case, the temperature and/or the diameter of each roll can be detected in a respective sub-area of 10 cm, 16 cm, 24 cm or 30 cm, in each case with the aid of one of the measuring devices. Again, the mentioned numerical values are merely exemplary. Depending on the size of the sub-areas and the offset between them, which is for example 10 cm or 20 cm, the sub-areas may overlap each other or be separated with respect to each other.

As another alternative, for each roll, the measuring system has a single measuring device, with which the temperature and/or diameter of the respective roll can be detected at least at all predefined detection positions as viewed in the direction of the roll axis. This embodiment has the advantage that only a minimum number of measuring devices are required.

In the latter case, two alternative embodiments are again possible.

On the one hand, the measuring device is arranged on the body of the storage device in such a way that it is movable when viewed in the direction of the roll axis, thereby making it possible to move the measuring device over the entire effective barrel length of the roll. In this case, the roll is first placed in the body of the storage device. The measuring device is then moved along the roll. Such a movement may be repeatedly interrupted for individual measurement processes, during which the temperature and/or diameter of the roll is detected.

On the other hand, the measuring device can also be arranged at a fixed location on the body of the storage device in such a way that the respective roll is moved past the measuring device during the transfer from the roll stand to the roll change carriage or vice versa. This embodiment is particularly simple, since it does not require any other moving parts besides the parts that must be present in both cases to transfer the roll from the roll stand to the roll change carriage or vice versa. More specifically, this embodiment can furthermore be implemented not only in the roll change carriage, but also in the roll stand itself. In particular, in this case it is possible to arrange the measuring device in a protected area of the stand housing on the operator side.

It is possible to manually send the detected measured values to an automation unit which controls the roll stand. Preferably, however, there is a data link between the measuring system and said automation unit, which automatically transfers the detected temperature and/or diameter to the automation unit, thus enabling the automation unit to associate the detected temperature and/or diameter with a predefined detection position. For this purpose, in addition to the temperature and/or diameter, it may also be necessary to transfer the detection position to the automation unit.

This object is further achieved by means of an operating method for a roll stand having the features of claim 9. According to the invention, an operating method of the type mentioned at the beginning comprises the steps of:
- with the aid of a measuring system arranged on the roll stand or on the roll changing carriage, the temperature and/or the diameter of the two rolls is detected in an automated manner at least at predefined detection positions, viewed in the direction of the roll axis, during or immediately after the removal of the roll from the roll stand and the transfer of the roll to the roll changing carriage,
the detected temperature and/or diameter are automatically transferred to an automation unit, thereby enabling the automation unit to associate the detected temperature and/or diameter with a predefined detection position,
The automation unit is embodied in such a way that it compares the temperature of the roll determined using the roll model with the temperature of the roll determined using the measurement system and/or it compares the diameter of the roll determined using the roll model with the diameter of the roll determined using the measurement system and uses this comparison to adapt the roll model.

The above-mentioned characteristics, features and advantages of the present invention, as well as the manner in which they are achieved, will become more clearly and distinctly understood in conjunction with the following description of exemplary embodiments, which will be described in more detail in conjunction with the drawings.

FIG. 1 is a schematic diagram showing a multi-stand roll row during rolling of rolled stock. FIG. 2 is a schematic diagram showing a model of the rolling gap and the identification of the roll stand function activation. FIG. 13 is a schematic diagram showing removal of a roll from the roll stand. FIG. 2 is a schematic diagram showing the roll train of FIG. 1 during a rolling stop. FIG. 1 is a schematic diagram showing the measurement system and automation equipment. 1 is a flow chart. FIG. 1 is a schematic diagram showing one possible embodiment of a roll changing carriage. FIG. 8 is a schematic diagram showing a modification of the roll changing carriage of FIG. 7; FIG. 6 is a schematic diagram showing a further modification of the roll changing carriage of FIG. 5 . FIG. 13 is a schematic diagram showing another possible embodiment of the roll changing carriage. FIG. 2 is a schematic diagram showing one possible embodiment of a roll stand.

According to FIG. 1, a metallic flat rolling stock 1 passes through the roll stands 2 of the roll train and is rolled during the process. The rolling takes place in each case between two rolls 3 of the same type in the respective roll stand 2. The flat rolling stock 1 can be a strip or a plate. The metal constituting the flat rolling stock 1 can be, for example, steel or aluminum. In principle, the flat rolling stock 1 can be hot rolled. However, the invention can be used to advantage, in particular when the rolling is cold rolling. The two rolls 3 of the same type are generally the two working rolls of the respective roll stand 2, i.e. the rolls acting directly and in direct contact with the flat rolling stock 1. Alternatively, they can be rolls acting directly or indirectly on the working rolls, for example the supporting rolls in the case of the 4-high stand or 6-high stand, or intermediate rolls arranged between the supporting rolls and the working rolls in the case of the 6-high stand. In each case, the rolls 3 are of the same type functionally and in the sense that one of the two rolls 3 acts on the rolling stock 1 from above and one from below.

The roll train is controlled by an automation unit 4, which in detail also controls the roll stands 2. The control of one of the roll stands 2 by the automation unit 4 is explained in more detail below in combination with FIG. 2 as a representative example of all roll stands 2. First, attention is drawn to the fact that this type of control is per se widely known to those skilled in the art. Specific implementation details are therefore not required.

According to FIG. 2, the automation unit 4 implements a roll model 5. The automation unit 4 sends operational data BD of the roll stand 2 to the roll model 5. Generally, the operational data BD includes the actual properties of the flat rolled stock 1 as it advances into the roll stand 2, such as its width, its thickness, its chemical composition, and its temperature. Generally, the operational data BD also includes setpoint properties of the flat rolled stock 1 as it advances out of the roll stand 2, such as its thickness together with its associated profile, associated contour and/or associated flatness. The automation unit 4 further sets, even if only temporarily, control data SD for the roll stand 2. The control data SD are also sent to the roll model 5. The control data SD can include, for example, settings, rolling forces, bending forces and other factors. With the aid of the roll model 5, the control device determines, for two rolls 3 of the same type, the temperature T of the respective roll 3 and/or the diameter D of the respective roll 3. Furthermore, the control device also determines the characteristics of the resulting rolling gap as the flat rolled stock 1 advances out of the roll stand 2 and, based on the latter, determines the predicted actual characteristics of the flat rolled stock 1. In all cases, the determination is made by determining the location as seen in the direction of the roll axis. It is thus performed at least at predefined specific positions p. However, the distance of 20 cm indicated in FIG. 2 between adjacent specific positions p should be understood as merely exemplary.

The automation unit 4 then compares the predicted actual characteristics of the flat rolled stock 1 as it leaves the roll stand 2, determined with the help of the roll model 5, with the desired setpoint characteristics of the flat rolled stock 1 as it leaves the roll stand 2. If necessary, the automation unit 4 then changes the control data SD in order to bring the predicted actual characteristics of the flat rolled stock 1 as it leaves the roll stand 2 as close as possible to the desired setpoint characteristics of the flat rolled stock 1 as it leaves the roll stand 2. If necessary, this involves an iterative procedure. The change in the control data SD is illustrated in FIG. 2 by the fact that the operating data BD are sent by the automation unit 4 only to the roll model 5, whereas the control data SD can be transmitted in both directions.

As already mentioned, the described procedure is already widely known to the person skilled in the art and is well known as such. It is repeatedly carried out during the rolling of the flat rolled stock 1, for example for new sections of the flat rolled stock 1 or for subsequent flat rolled stock 1. As a result, the automation unit 4 thereby repeatedly determines the temperature T and/or the diameter D of the roll 3 and, based thereon (among other factors and from the determination of the location as viewed in the direction of the roll axis), determines the activation SD, i.e. the control data SD, of the respective functions of the roll stands 2. The determination of the diameter D encompasses both the temperature-induced expansion of the roll 3 and the wear-related changes of the diameter D. The corresponding model is known to the person skilled in the art under the term TWC (thermal wear crown). As part of the modeling, the temperature of the flat rolled stock 1 is often also determined, which is also widely known and well known to the person skilled in the art.

After rolling a certain number of flat rolling stocks 1, for example 20 or 25 flat rolling stocks 1, the roll 3 needs to be changed. For this purpose, according to the illustration in FIG. 3, a roll change carriage 6 is positioned next to the roll stand 2 in which the roll 3 is to be changed. In detail, the roll stand 2 has a stand housing 2' on the operator side and a stand housing 2'' on the drive side. The roll change carriage 6 is arranged next to the stand housing 2' on the operator side. The roll 3 is then removed from the roll stand 2 and transferred to the roll change carriage 6 as indicated by the corresponding arrow in FIG. 3. The removed roll 3 is shown in dotted lines in FIG. 3.

Typically, rolling interruptions are introduced into the process during which the flat rolled stock 1 is not rolled in the roll train. Figure 4 shows the corresponding state of the roll train. However, there are also known procedures that allow the rolls 3 to be changed while the flat rolled stock 1 is passing through the roll stand 2. In the context of the present invention, it is of minor importance which procedure is adopted.

The removal of the rolls 3 and the transfer of the rolls 3 to the roll exchange carriage 6 can be carried out in a conventional and widely known manner. However, it is important that the temperature T and/or the diameter D of the two rolls 3 are detected during the removal of the rolls 3 from the roll stand 2 and the transfer of the rolls 3 to the roll exchange carriage 6 or immediately after said procedure. The detection is therefore carried out before the roll exchange carriage 6 is moved away from the roll stand 2.

The detection is carried out automatically by means of a measuring system 7, which is arranged on the roll stand 2 or on the roll change carriage 6. Furthermore, the detection is carried out by determining the location as seen in the direction of the roll axis, i.e. at least at predefined detection positions p'. Directly adjacent detection positions p' can have a distance of, for example, 8 cm, 10 cm, 12 cm, 15 cm or 20 cm from each other.

Furthermore, the temperature T and/or the diameter D can be detected individually and independently of each other by means of the measurement system 7. Thus, it is not possible or not easily possible to draw conclusions about the temperature T for another detection position p' from the temperature T detected for a particular detection position p'. A similar situation applies with respect to the detected diameter D. A possible implementation of this procedure is described below.

The detected temperature T and/or diameter D are automatically transferred from the measuring system 7 to the automation unit 4. For this purpose, the measuring system 7 has a data link with the automation unit 4. Wired or wireless transfer are possible options here. To implement wireless transfer, the measuring system 7 and the automation unit 4 can implement a wireless link via the antenna 8, for example according to the illustration of FIG. 5.

The detected temperature T and/or diameter D are transferred in such a way that the automation unit 4 is able to associate the detected temperature T and/or diameter D with a predefined detection position p'. For example, the detection positions p' may be transferred simultaneously. The automation unit 4 can also know in advance at which detection positions p' the temperature T and/or diameter D are detected and in which order the temperature T and/or diameter D are transferred from the measuring system 7 to the automation unit 4.

The automation unit 4 receives the transferred temperature T and/or diameter D in step S1 according to FIG. 6. In step S2, the automation unit 4 performs coordinate matching. The detected temperature T and/or diameter D for the detection position p' can be used to determine the corresponding temperature T and/or diameter D for the specific position p, for example by linear interpolation or by any other type of interpolation method. As an alternative, it is possible to transform the temperature T and/or diameter D determined with the help of the model for the specific position p in step S2 to the detection position p' by linear interpolation or by any other type of interpolation method. If the detection position p' and the specific position p correspond directly to each other, step S2 can be omitted.

In step S3, the automation unit 4 compares the temperature T and/or the corresponding diameter D of the roll 3 determined using the roll model 5 with the temperature T and/or the diameter D of the roll 3 detected using the measurement system 7. In particular, in step S3, the automation unit 4 is able to determine a first correction value δk1 for a first model parameter k1 of the roll model 5 based on the comparison of the temperature T and to determine a second correction value δk2 for a second model parameter k2 of the roll model 5 based on the comparison of the diameter D. Using the determined correction values δk1, δk2, the automation unit 4 can then correct the model parameters k1, k2 in step S4, thereby adapting the roll model 5. Naturally, the model parameters k1, k2 are part of the determination of the temperature T and/or the diameter D of the roll 3, which is performed using the roll model 5.

Next, possible embodiments in which the detection of temperature T and/or diameter D can be performed are described below in combination with Figures 7 to 11.

In all embodiments, there is a storage device for the two rolls 3. In most of the embodiments, the storage device is designed as a roll change carriage 6 according to the illustrations of Figs. 7 to 10. In such cases, the storage device (i.e. the roll change carriage 6) can be positioned relative to the roll stand 2 in such a way that the roll 3 can be transferred from the roll stand 2 to the storage device or vice versa. In individual cases, however, the storage device can also be a constituent part of the roll stand 2 itself, as illustrated in Fig. 11.

Thus, for example, according to the illustration in FIG. 7, the measuring system 7 can have several measuring devices 9 for each roll 3. In the embodiment according to FIG. 7, the measuring device 9 is arranged at a fixed location with respect to the body 10 of the roll changing carriage 6. With the aid of the measuring device 9, the temperature T and/or the diameter D of the respective roll 3 is detected in each case at one of the predefined detection positions p', as viewed in the direction of the roll axis. In the context of the embodiment according to FIG. 7, the roll 3 is thereby first removed from the roll stand 2 and transferred to the roll changing carriage 6. After this, each measuring device 9 detects the temperature T and/or the diameter D of the associated roll 3 for its respective detection position p'. The detection of the temperature T can be achieved both by contact and without contact. The detection of the temperature T by contact can be achieved, for example, by means of a sensing probe. For this purpose, the sensing probe can implement, for example, a PT100 element. It is also possible to carry out the detection of the diameter D by contact, if applicable, by means of the same sensing probe or some other sensing probe. To detect the diameter D, a corresponding sensing probe may, for example, resemble in design a micrometer screw. As an alternative, non-contact detection of the temperature T can be performed, for example, by means of an infrared camera. It is likewise possible to perform non-contact detection of the diameter D, for example, by means of a laser distance measurement or an ultrasonic distance measurement.

Figure 8 shows an embodiment similar to that of Figure 7. In the case of the embodiment shown in Figure 8, the measuring system 7 also has a number of measuring devices 9 for each roll 3. In contrast to the embodiment of Figure 7, however, the measuring devices 9 in the embodiment according to Figure 8 are arranged to be movable individually or together in the direction of the roll axis relative to the body 10. The mobility is indicated by a corresponding double-headed arrow in Figure 8. With the aid of the measuring devices 9, the temperature T and/or the diameter D of each roll 3 can be detected in each case in a respective subsection comprising at least one of the predefined detection positions p', as viewed in the direction of the roll axis. In other respects, the expressions relating to Figure 7 continue to apply.

In the case of the embodiments shown in Figures 7 and 8, the measuring system 7 in each case has several measuring devices 9 for each roll 3. However, it is also possible for the measuring system 7 to have only a single measuring device 9 for each roll 3. In such a case, it must be possible to detect the temperature T and/or the diameter D of the respective roll 3 with the aid of an individual measuring device 9 at least at all predefined detection positions p' as viewed in the direction of the roll axis.

To enable such a detection, for example, the embodiment of FIG. 9 can be adopted, which is essentially the embodiment of FIG. 8. The difference is that, in contrast to the embodiment of FIG. 8, there is only a single measuring device 9 for each roll 3, but this is compensated for by the correspondingly larger area over which this measuring device 9 can be moved, viewed in the direction of the roll axis, so that it is possible to move the measuring device 9 at least over the entire effective barrel length of the roll 3. In FIG. 9, as in FIG. 8, the mobility is indicated by a corresponding double-headed arrow.

As a result, for each roll 3, the only important factor for data acquisition at all predefined detection positions p' using a single measuring device 9 is the relative movement of the measuring device 9 with respect to the roll 3. Therefore, it is not important during data acquisition whether the roll 3 is stationary in the body 10 of the roll exchange carriage 6 and the measuring device 9 is moved, or conversely, whether the measuring device 9 is stationary and the roll 3 is moved. Thus, according to the illustration of FIG. 10, it is possible to kinematically reverse the procedure of FIG. 9 and place the measuring device 9 at a fixed location on the body 10 of the roll exchange carriage 6.

In such a case, the measuring device 9 only needs to be arranged in such a way that the respective roll 3 is moved past the measuring device 9 during its transfer from the roll stand 2 to the roll change carriage 6 or vice versa. This can be easily implemented.

Precisely this embodiment, i.e. the embodiment in which the measuring device 9 is arranged at a fixed location and the respective roll 3 is moved past the measuring device 9 during the transfer from the roll stand 2 to the roll change carriage 6 or vice versa, can also be implemented in such a way that, according to the illustration of FIG. 11, the measuring device 9 is not arranged at a fixed location on the roll change carriage 6 but on the roll stand 2 itself, in particular on the stand housing 2' on the operator side. In such a case, the storage device is therefore a constituent part of the roll stand 2.

The invention has many advantages. In particular, continuous correction of the model parameters k1, k2 of the roll model 5 is possible in a simple and reliable manner. Improved modeling also allows for improved quality in the rolling of the rolled stock 1. In particular, the quality of the thickness, flatness and profile can be increased. The modeling of the temperature of the rolled stock 1 can also be improved. Furthermore, improved predictions in the rolling of new materials are possible.

Although the present invention has been illustrated and described in more detail using preferred exemplary embodiments, the present invention is not limited to the disclosed examples, and other variations may be derived therefrom by those skilled in the art without exceeding the scope of protection of the present invention.

REFERENCE SIGNS LIST 1 ... Rolling stock 2 ... Roll stand 2', 2'' ... Stand housing 3 ... Roll 4 ... Automation unit 5 ... Roll model 6 ... Roll change carriage 7 ... Measurement system 8 ... Antenna 9 ... Measurement device 10 ... Body BD ... Operation data D ... Diameter k1, k2 ... Model parameters p ... Specific position p' ... Detection position S1 to S4 ... Steps SD ... Control data T ... Temperature δk1, δk2 ... Correction values

Claims (4)

A storage device for two rolls (3) of the same type in a roll stand (2), said storage device being a constituent part of said roll stand (2) or capable of being positioned relative to said roll stand (2) in such a way that said rolls (3) can be transferred from said roll stand (2) to said storage device or vice versa,
said storage device having at least one measuring system (7) by means of which the temperature (T) and/or the diameter (D) of said roll (3) can be detected individually and independently of one another, at least at predefined detection positions (p'), when viewed in the direction of the roll axis ,
for each roll (3), said measuring system (7) comprises a single measuring device (9) by means of which the temperature (T) and/or the diameter (D) of each said roll (3) can be detected at least at all of said predefined detection positions (p') when viewed in the direction of the roll axis,
The measuring device (9) is arranged at a fixed location on the body (10) of the storage device in such a way that each roll (3) is moved past the measuring device (9) during its transfer from the roll stand (2) into the roll change carriage (6) or vice versa.
A storage device comprising: The storage device according to claim 1, characterized in that the storage device is designed as a roll change carriage (6). 3. Storage device according to claim 1 or 2, characterized in that there is a data link between the measuring system (7) and an automation unit (4) controlling the roll stand (2) and that the measuring system (7) automatically transfers the detected temperature (T) and/or diameter (D) to the automation unit (4), thereby enabling the automation unit (4) to associate the detected temperature (T) and/or diameter ( D ) with the predefined detection position (p'). A method for operating a roll stand (2), comprising the steps of:
- the flat rolling stock (1) passing through said roll stand (2) is rolled between two rolls (3) of the same type in said roll stand (2),
an automation unit (4) controlling said roll stand (2) using a roll model (5) using operational data (BD) of said roll stand (2) for said rolls (3) of the same type repeatedly determines the temperature (T) and/or the diameter (D) of said rolls (3) at least at specific predefined positions (p) as viewed in the direction of the roll axis and determines the activation (SD) of the function of said roll stand (2) based on the determined temperature (T) and/or diameter (D), so that the rolling gap of said roll stand (2) is set during the rolling of said flat rolling stock (1) as far as possible according to setpoint inputs,
a method of operating the roll stand (2), in which the rolls (3) of the same type are removed from the roll stand (2) from time to time and transferred into a roll change carriage (6),
- with the aid of a measuring system (7) arranged on the roll-changing carriage (6) according to claim 2 , the temperature (T) and/or the diameter (D) of the two rolls (3) are automatically detected during or immediately after the removal of the rolls (3) from the roll stand (2) and their transfer into the roll-changing carriage (6), as viewed in the direction of the roll axis, at least at predefined detection positions (p'),
the detected temperature (T) and/or diameter (D) are automatically transferred to the automation unit (4), thereby enabling the automation unit (4) to associate the detected temperature (T) and/or diameter (D) with a predefined detection position (p');
- the automation unit (4) compares the temperature (T) of the roll (3) determined by means of the roll model (5) with the temperature (T) of the roll (3) determined by means of the measurement system (7) and/or compares the diameter (D) of the roll (3) determined by means of the roll model (5) with the diameter (D) of the roll (3) determined by means of the measurement system (7) and uses this comparison to adapt the roll model (5).

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