阅读说明：本技术 轧机机架的调整的得出 (Obtaining adjustments of roll stands ) 是由 克劳斯·洛赫 马蒂亚斯·库尔茨 于 2020-02-27 设计创作，主要内容包括：板坯(2)沿输送方向(y)穿过炉(1)并在那里被加热到轧制温度。在炉(1)中分别存在多个板坯(2)。在加热后,板坯(2)在至少一个轧机机架(4、6)中在至少一个轧制道次中被轧制。得出装置(8)接收信息(I1、I2、I3),该信息表明板坯(2)沿正交于输送方向(y)的至少一个方向(x、z)穿过炉(1)时相对彼此占据哪些区域。得出装置根据信息(I1、I2、I3)在没有事先得出相应的板坯(2)的相应的温度分布的情况下或在没有利用相应的板坯(2)的所得出的温度的情况下对于相应的板坯(2)的至少一个轧制道次得出执行轧制道次的轧机机架(4、6)的调整(A)。得出装置(8)在得出对于相应的板坯(2)的调整(A)的情况下考虑由在输送方向(y)上相对于相应的板坯(2)相应之前和/或之后的板坯(2)所占据的区域。得出装置将轧机机架(4、6)的相应的所得出的调整(A)输送给控制装置(5、7),控制装置在轧制相应的板坯(2)时在考虑相应的调整(A)的情况下控制轧机机架(4、6)。(The slab (2) is passed through the furnace (1) in a conveying direction (y) and is heated there to a rolling temperature. A plurality of slabs (2) are present in the furnace (1). After heating, the slab (2) is rolled in at least one rolling pass in at least one rolling stand (4, 6). The deriving means (8) receive information (I1, I2, I3) indicating which areas the slabs (2) occupy with respect to each other when they pass through the furnace (1) along at least one direction (x, z) orthogonal to the conveying direction (y). The deriving device derives from the information (I1, I2, I3) an adjustment (A) of the rolling stand (4, 6) performing the rolling pass for at least one rolling pass of the respective slab (2) without previously deriving a respective temperature distribution of the respective slab (2) or without using the derived temperature of the respective slab (2). The determining device (8) takes into account the regions occupied by the slabs (2) preceding and/or following in the transport direction (y) relative to the respective slab (2) when determining the adjustment (A) for the respective slab (2). The derivation device transmits the respective derived adjustment (A) of the roll stands (4, 6) to a control device (5, 7), which controls the roll stands (4, 6) while taking into account the respective adjustment (A) when rolling the respective slab (2).)

1. A method for determining an adjustment (A) for at least one rolling stand (4, 6) during the rolling of a slab (2) in at least one rolling pass, wherein the slab (2) is passed through a furnace (1) in a conveying direction (y) such that a plurality of slabs (2) are present in each case in the furnace (1), wherein the slab (2) is heated to a final temperature during the passage through the furnace (1),

-wherein deriving means (8) receive information (I1, I2, I3) indicative of the areas occupied by the slabs (2) with respect to each other when they pass through the furnace (1) along at least one direction (x, z) orthogonal to the conveying direction (y),

-wherein the deriving means (8) derive the adjustment (A) of the rolling stand (4, 6) carrying out the rolling pass for at least one rolling pass of the respective slab (2) from the information (I1, I2, I3) received by the deriving means without previously deriving a respective temperature distribution of the respective slab (2) or without using the derived temperature of the respective slab (2),

-wherein the deriving means (8) take into account, in deriving the adjustment (A) for the respective slab (2), the area occupied by slabs (2) preceding and/or (2) following each relative to the respective slab (2) in the transport direction (y),

-wherein the deriving means (8) deliver the respective derived adjustment (a) of the roll stands (4, 6) to a control means (5, 7) which, when rolling the respective slab (2), controls the roll stands (4, 6) taking into account the respective adjustment (a).

2. The derivation method as claimed in claim 1,

it is characterized in that the preparation method is characterized in that,

the determining device (8) additionally receives information (pi) indicating the distances (a, a ') that the slabs (2) adjacent to one another in the conveying direction (y) have from one another when passing through the furnace (1) in the conveying direction (y), and the determining device (8) takes into account the distances (a, a') of the slabs (2) adjacent to one another in the conveying direction (y) when determining the adjustment (A) of the rolling stands (4, 6) carrying out the rolling pass.

3. The derivation method according to claim 1 or 2,

it is characterized in that the preparation method is characterized in that,

the respective adjustment (A) is spatially resolved in the width direction of the respective slab (2).

4. The derivation method as claimed in claim 1, 2 or 3,

it is characterized in that the preparation method is characterized in that,

the determining device (8) determines the adjustment (A) of the roll stands (4, 6) as a function of the position in the longitudinal direction in relation to the respective slab (2) or as a function of time.

5. Derivation method according to any one of the preceding claims,

it is characterized in that the preparation method is characterized in that,

the derivation device (8) receives a further parameter (P) which describes the slab (2) itself and takes it into account when deriving the adjustment (A) of the rolling stands (4, 6) which carry out the rolling pass.

6. Derivation method according to any one of the preceding claims,

it is characterized in that the preparation method is characterized in that,

the determination device (8) receives a furnace temperature (T) and/or a residence time (Δ T) of the slab (2) in the furnace (1), and the determination device (8) takes into account the furnace temperature (T) and/or the residence time (Δ T) of the slab (2) when determining the adjustment (A) of the roll stands (4, 6) carrying out the rolling pass.

7. The derivation method according to any one of claims 1 to 6,

it is characterized in that the preparation method is characterized in that,

the deriving device (8) receives charging data (B1) of the furnace (1), which describes the charging of the furnace (1) with the slab (2), and the deriving device (8) takes into account the charging data (B1) of the furnace (1) when deriving the adjustment (A) of the rolling stand (4, 6) to carry out the rolling pass.

8. The derivation method according to any one of claims 1 to 6,

it is characterized in that the preparation method is characterized in that,

the derivation means (8) receive data (D) detected by sensors, which are characteristic of the areas respectively occupied by the slabs (2) in the furnace (1).

9. Derivation method according to any one of the preceding claims,

it is characterized in that the preparation method is characterized in that,

the derivation device (8) derives the adjustment (A) of the rolling stands (4, 6) by means of multidimensional linear regression, by means of a non-linear approximation by means of multidimensional polynomials or splines, or by means of a neural network.

10. A computer program comprising machine code (10) that is processable by a deriving means (8), wherein processing the machine code (10) by the deriving means (8) causes the deriving means (8) to implement the deriving method according to any one of the preceding claims.

11. Derivation device, wherein the derivation device is programmed with a computer program (9) according to claim 10 such that, in operation, the derivation device implements a derivation method according to any one of claims 1 to 9.

12. A combination of the derivation means (8) and the control means (5, 7) according to claim 11,

-wherein the derivation means (8) and the control means (5, 7) are connected to one another in terms of data technology such that the derivation means (8) transmits the settings (A) of the roll stands (4, 6) derived therefrom to the control means (5, 7),

-wherein the control device (5, 7) controls the rolling stand (4, 6) when rolling the respective slab (2),

-wherein the control device (5, 7) takes into account the adjustment (A) of the rolling stand (4, 6) transmitted to the control device when rolling the slab (2).

13. A rolling plant for rolling slabs (2), wherein the rolling plant has at least one furnace (1) through which the slab (2) is passed in a conveying direction (y) and by means of which the slab (2) can be heated to a final temperature, wherein the furnace (1) is dimensioned such that a plurality of slabs (2) are simultaneously located in the furnace (1) as viewed in the conveying direction (y), wherein the rolling plant also has at least one rolling stand (4, 6) to which the slab (2) is conveyed, wherein the rolling plant has a combination according to claim 12, wherein the at least one rolling stand (4, 6) is controlled by the control device (5, 7) of the combination.

Technical Field

The invention relates to the development of an adjustment of a roll stand for the purpose of conveying a blank plate for rolling.

Background

The slab is hot rolled in a mill stand. As the respective slab exits the mill stand, it causes a curvature or hook formation. The curvature or hook occurs when the slab is rolled stronger in the mill stand on one side thereof than on the other side thereof.

Both curvature and hooking are disadvantageous and should therefore be avoided as much as possible. If the cause of the occurrence of the camber or hook is known, the camber or hook formation can be suppressed or at least positively influenced (usually reduced) by correcting the adjustment of the roll stand, in particular by setting the roll gap asymmetrically.

The curvature or hook formation can already occur in the first rolling pass of the slab, i.e. the first rolling pass to which the slab is subjected after leaving the furnace that heats the slab to the rolling temperature.

It is known from WO 2012/159849 a1 that in particular a temperature wedge (temputerkeil) has an influence on the arc or hook formation. It is also mentioned that the asymmetrical adjustment of the roll stand can be derived from a temperature wedge or from a strength wedge (Festigkeitskeil) corresponding thereto. However, it is not derivable from WO 2012/159849 a1 in what way and method such a temperature wedge can be derived. However, it is known to form a local temperature wedge in a reinforced manner in the non-overlapping region of two slabs adjacent in the furnace.

A Model-based method is known from the specialized article "Control of press Furnaces for Steel Slab recycling Using a Numerical Model", published by p.marino et al in Latin American Applied Research, bd.34, pages 249 to 255 (2004), by means of which the temperature of the Slab can be derived as a function of the Slab length. The document does not explicitly consider the dependence of temperature on width.

It is known from the Applied Thermal Engineering, 27(5-6), pages 1105 to 1114, specialized article "on line Simulation model of the slab-speaking process in a extruder-type furnace", published by Anton _ Jaklic et al, 4.2007, to derive three-dimensional heat distribution of slabs in a pusher furnace on-line by means of a Simulation model.

In a similar manner, it is also possible for the profile to be changed during the rolling of the slab, with which the slab exits from the rolling stand that carries out the respective rolling pass. A possible reason for this is that the two sides of the slab are heated differently in the head region and/or in the tail region thereof by means of the furnace than in the intermediate region between the head and the tail thereof. Such a change in profile is also disadvantageous and should be avoided as far as possible.

Disclosure of Invention

The temperature distribution in the slab can be determined by means of the model and then used in determining the adjustment of the roll stand. For this purpose, a model for deriving the temperature distribution must be explicitly implemented. Furthermore, the model must be implemented such that the temperature distribution can be derived online by means of the model. This is associated with significant costs and with significant difficulties and is also very computationally intensive.

The object of the invention is to create a possibility for reliably avoiding or at least reducing curvature formation or hook formation during rolling of a slab in a simple manner. In particular, it should be possible to determine the temperature distribution in the slab without the need to implement a temperature model. Variations in the profile of the slab should also be counteracted, if possible.

This object is achieved by a derivation method having the features of claim 1. Advantageous embodiments of the method are the subject matter of the dependent claims 2 to 9.

According to the invention, a method is created for setting at least one rolling stand when rolling a slab in at least one rolling pass, wherein the slab is passed through a furnace in a transport direction such that in each case a plurality of slabs are present in the furnace, wherein the slabs are heated to a final temperature during the passage through the furnace,

-wherein information is derived which areas the device indicates with respect to each other which areas the slabs occupy when passing through the furnace in at least one direction orthogonal to the conveying direction,

wherein the deriving means derive, on the basis of the information received therefrom, the adjustment of the rolling stand carrying out the rolling pass for at least one rolling pass of the respective slab without prior deriving a respective temperature profile of the respective slab or without using the derived temperature of the respective slab,

wherein the deriving means take into account, in the case of deriving an adjustment for a respective slab, the area occupied by a respective preceding slab relative to the respective slab in the conveying direction and/or the area occupied by a respective following slab relative to the respective slab in the conveying direction,

the control device is configured to control the rolling stands in such a way that the rolling stands are positioned in a rolling position, in which the rolling position of the rolling stands is determined by the position of the rolling stands.

The invention is based first of all on the recognition that the temperature profile is ultimately not important for the operator of the roll stand. The operator only has to know that he has to set up his roll stand. Thus, it is possible to "skip" or not to make use of the derivation of the temperature profile itself. This can significantly simplify the derivation of the adjustment.

The invention is based on the recognition, inter alia, that it is important for the formation of the hooks or arcs to see how much or not adjacent slabs overlap, viewed orthogonally to the conveying direction. The same applies, if necessary, to the case of a change in the profile of the slab viewed in the longitudinal direction of the slab.

Usually, the superimposition of the slabs is obtained in particular in the longitudinal direction of the slabs. However, in individual cases it may be expedient to obtain a superposition of the slabs in the thickness direction of the slabs. If such a derivation in the thickness direction is performed, the derivation in the thickness direction is usually performed in addition to the superimposition of the slabs in the longitudinal direction of the slabs. However, in individual cases, the determination in the thickness direction can also be carried out instead of determining a slab overlap in the slab longitudinal direction.

Typically, after the first rolling pass, the respective slab is subjected to at least one further rolling pass. At least one further rolling pass can be carried out (in the case of a reversible stand) in the rolling stand in which the first rolling pass is carried out. Alternatively, at least one further rolling pass (in the case of a multi-stand rolling pass) can be carried out in at least one further rolling stand. The device for determining preferably determines the adjustment of the rolling stand at least for the first rolling pass, to which the respective slab is subjected after leaving the furnace. In this way, it is possible to counteract the curvature or hook formation and/or also the profile change in the first rolling pass, no previous rolling being carried out and therefore no values from the previous rolling pass being available. However, it is also possible (in individual cases alternatively, in general additionally) to derive an adjustment for at least one further rolling pass.

Preferably, the determining device additionally receives information from which the distance between the slabs adjacent in the transport direction from one another during the passage through the furnace in the transport direction is determined and takes into account the distance between the slabs adjacent in the transport direction during the determination of the adjustment of the roll stand performing the rolling pass.

This procedure is advantageous in particular in a walking beam furnace, since slabs adjacent in the conveying direction in a walking beam furnace are spaced apart from one another. The spacing is, though, generally constant during transport of the respective slabs through the furnace. However, the pitch does not have to be constant from one pair of slabs adjacent to each other to another pair of slabs adjacent to each other. In contrast, in the case of a pusher furnace, adjacent slabs usually lie directly against one another (spacing 0).

In general, the respective adjustment derived by the deriving means is spatially resolved in the width direction of the respective slab. For example, the deriving means can derive a pivot value for asymmetric wedge adjustment or a bending value for roll bending.

Preferably, the deriving means derive the adjustment of the roll stand as a function of the position attributed to the respective slab in the longitudinal direction or as a function of time. Thus, the arc formation and the hook formation can be more favorably offset. This is not absolutely necessary in order to be able to counteract the profile change.

The spatial resolution in the longitudinal direction of the respective slab can be determined as desired. For example, in the simplest case, it is only possible to distinguish between the rolling for the head of the slab and the rolling of the remainder of the slab or the adjustment of the rolling for the tail of the slab and the rolling of the remainder of the slab. It is also possible to distinguish between the rolling for the head of the slab, the rolling of the middle part of the slab (Filet) and the adjustment of the rolling of the tail of the slab. It is also possible to distinguish between rolling for the head of the slab, rolling of the transition from the head of the slab to the body of the slab, rolling of the transition from the body of the slab to the tail of the slab, and rolling of the tail of the slab. Other spatial resolutions are also possible. It is also possible to provide a continuous transition, for example in the form of a ramp, in the transition from the adjustment for one section of the slab to the adjustment for the next section of the slab. A similar embodiment is applicable to determining the adjustment as a function of time.

The deriving device preferably receives further parameters describing the slab itself and takes them into account when deriving the adjustment of the rolling stand in which the rolling pass is carried out. Hereby, the curvature or hook formation or profile change can also be counteracted better.

In particular, the width of the respective slab, its chemical composition and, if appropriate, its temperature during the transfer into the furnace are taken into consideration as further parameters. Although the length and thickness of the slab are also important parameters. However, they are not described together in this point, since they are already (directly or indirectly) included in the information that determines which areas the individual slabs occupy with respect to each other when passing through the furnace in at least one direction orthogonal to the conveying direction.

Preferably, the determination device receives the furnace temperature and/or the residence time of the slab in the furnace and takes the furnace temperature and/or the residence time of the slab into account in determining the adjustment of the roll stand which performs the rolling pass. This also enables the curvature or hook formation to be better offset.

The determining device preferably receives charging data of the furnace, which describes the charging of the furnace with the slab and which is taken into account when determining the adjustment of the roll stand for carrying out the rolling pass. The charge thus describes how the respective slabs are arranged in the furnace when they are transferred to the furnace. Thus, the charge describes the initial position of the slab in the furnace.

For example, in the case of a step furnace, the loading data can indirectly determine the spacing of adjacent slabs in the conveying direction. Furthermore, the loading data enable the arrangement of the slabs relative to one another in the longitudinal direction of the slabs to be determined, and thus, in conjunction with the length of the slabs, a conclusion to be drawn as to which regions the slabs occupy orthogonally to the conveying direction.

Alternatively, the determination device receives data detected by the sensors, which are characteristic for the respective areas occupied by the slabs in the furnace. Corresponding sensors are generally known to the person skilled in the art. Purely by way of example, a camera, a laser sensing device and an ultrasound sensing device are listed. In the case of sensor detection data, the area occupied by the slab orthogonal to the conveying direction (or by means of additionally using the thickness of the slab) is derived from the data detected by the sensor.

The derivation of the adjustment can be done in different ways and methods. For example, it is possible for the determining device to determine the adjustment of the roll stand by means of a multidimensional linear regression, by means of a non-linear approximation by means of multidimensional polynomials or splines, or by means of a neural network.

The object is also achieved by a computer program having the features of claim 10. According to the invention, the computer program comprises a machine code which can be processed by the deriving means, wherein processing the machine code by the deriving means causes the deriving means to carry out the deriving method according to the invention.

The object is also achieved by a deriving device having the features of claim 11. According to the invention, the derivation means is programmed with a computer program according to the invention, such that the derivation means implements the derivation method according to the invention in operation.

This object is also achieved by the combination of the deriving means according to the invention and the control means having the features of claim 12. According to the invention, the control device and the derivation device are connected to one another in terms of data, so that the derivation device transmits the adjustment of the rolling stand derived by the derivation device to the control device. Furthermore, the control device controls the roll stands during the rolling of the respective slab. The control device takes into account the settings of the rolling stand transmitted to the control device when rolling the slab.

The object is also achieved by a rolling plant for rolling slabs having the features of claim 13. According to the invention, the rolling installation has at least one furnace through which the slab is passed in the conveying direction and by means of which the slab can be heated to a final temperature. The furnace is dimensioned such that a plurality of slabs are simultaneously in the furnace, viewed in the conveying direction. The rolling plant also has at least one rolling stand to which the slab is fed for rolling. Finally, the rolling plant has a combination according to the invention (see above), wherein at least one rolling stand is controlled by a combined control device.

Drawings

The above features, characteristics and advantages of the present invention and how to implement them are explained in detail in the following description of embodiments with reference to the accompanying drawings. Here, it is shown in a schematic view:

figure 1 shows a rolling plant in which,

FIGS. 2 to 5 show flowcharts, and

fig. 6 and 7 show the rolling stand as seen in the rolling direction.

Detailed Description

According to fig. 1, a rolling plant has at least one furnace 1. The furnace 1 can be designed, for example, as a pusher furnace (Sto β ofen) or as a walking beam furnace. The furnace is dimensioned according to the illustration of fig. 1 such that, viewed in the conveying direction y, a plurality of slabs 2 are simultaneously located in the furnace. The slabs 2 thus have, viewed in the conveying direction y, a preceding slab 2 and a following slab 2, respectively. However, the illustration in fig. 1 is purely exemplary, in which a total of five slabs 2 are in the furnace 1.

The slabs 2 are successively fed to the furnace 1 at the furnace inlet 1a and are transported through the furnace 1 in the transport direction y by means of a corresponding conveyor 1 b. The slabs 2 are supplemented in fig. 1 with lower case letters a, b, etc. according to the order in which they are fed to the furnace 1. During transport through the furnace 1, the slab 2 is heated to its rolling temperature by means of the respective heating device 1 c. After heating, the slab 2 is transported out of the furnace 1 at the furnace outlet 1 d. The furnace inlet la, the conveying device lb, the heating device lc and the furnace outlet ld are components of the furnace 1.

The slab 2 is typically made of steel. Alternatively, the slab can be made of other metals (for example, aluminum). As fig. 1 shows by way of example for a slab 2, the slab 2 has a length 1 and a width b, respectively. The slab also has a thickness d. However, the thickness d is not recognizable in fig. 1 as well as in other figures. The length 1 is typically in the range between 10m and 25 m. The width b is typically in the range between 50cm and 3.0 m. The thickness d is typically in the range between 50mm and 300 mm. The length 1 and the width b as well as the thickness d can be different from slab 2 to slab 2. The rolling temperature (i.e. the temperature with which rolling is started after the respective slab 2 has been carried out of the furnace 1) is typically between 950 ℃ and 1200 ℃ in the case of steel, and correspondingly higher or lower in the case of other metals. The final temperature at which the slab 2 exits from the furnace 1 is therefore at or slightly above the rolling temperature. The furnace 1 is controlled by a control device 3, which is referred to below as furnace controller 3.

After the respective slab 2 has been removed from the furnace 1, the respective slab 2 is fed to a roll stand 4. The rolling stand 4 is referred to hereinafter as the first rolling stand 4, if necessary, since it is the rolling stand that performs the first rolling pass after the respective slab 2 has been transported out of the furnace 1. In the rolling stand 4, the respective slab 2 is thus rolled. The roll stands 4 are controlled by a control device 5, which is referred to below as a first stand controller 5, if necessary. The first roll stand 4 is also only controlled by the first stand controller 5 when the respective slab 2 is rolled in the first roll stand 4.

In addition to the first roll stand 4, further roll stands 6 are usually present. The other roll stands 6 are controlled by corresponding control devices 7, which are referred to below as further stand controllers 7 if required. Only one of the other roll stands 6 is shown in fig. 1. The same applies to the other rack controllers 7. Whether and how many additional roll stands 6 can be present can vary from case to case. The rack controllers 5, 7 can be constructed as separate units from each other or combined into a common unit as desired. The rolling of the slab 2 takes place in the first rolling stand 4 and also in the other rolling stands 6 in the rolling direction x at a rolling speed v. The rolling direction x is generally uniform for all rolling stands 4, 6. The rolling speed v is usually different at the roll stands 4, 6 from the roll stands 4, 6.

If the slab 2 is rolled in the first rolling stand 4 and/or the further rolling stand 6 in the opposite direction, the rolling of the slab 2 in the rolling stands 4, 6 also takes place in the opposite direction to the rolling direction indicated by x in fig. 1. Usually, for example, the slab 2 is first pre-rolled in a plurality of passes in the first rolling stand 4 and then finish-rolled in the other rolling stands 6 in one pass each of the other rolling stands 6. In any case, the rolling direction x is orthogonal to the transport direction y and extends in the longitudinal direction of the slab 2.

For the sake of clarity, it is mentioned that the illustration in fig. 1 is purely schematic. In particular, the pitch and pitch ratio are not drawn to scale. Thus, for example, the first roll stand 4 is usually at a considerably greater distance from the other roll stands 6 than the other roll stands 6. The spacing between the respective other roll stands 6 is typically between 4m and 7 m. The spacing from the first roll stand 4 to the next roll stand 6 is typically 50m or more. Usually, the slabs 2 are rolled in the first rolling stand 4 in the opposite direction before the rolling of the respective slab 2 in the other rolling stand 6 begins.

At least one of the rack controllers 5, 7 is connected to the output device 8 in a data-technical manner. In particular, at least the first rack controller 5 is usually connected to the output device 8 in a data-technical manner. Due to the data-related connection, it is possible for the deriving device 8 to transmit the settings a of the respective rolling stand 4, 6 of the respective rolling pass of the respective slab 2, which settings a are derived by the deriving device, to the respective stand controller 5, 7. The respective stand controller 5, 7 takes into account the respective adjustment a transmitted to the stand controller when rolling the respective slab 2.

In order to be able to derive the adjustment a, the deriving means 8 are programmed with a computer program 9. The computer program 9 comprises machine code 10 that can be processed by the deriving means 8. The processing of the machine code 10 by the deriving means 8 causes the deriving means 8 to carry out a deriving method, which is explained below purely by way of example for the sheet metal blank 2 c. Similar embodiments apply to other slabs 2.

According to fig. 2, it follows that the device 8 receives in step S1 information I1 for a particular slab 2 (i.e. the slab 2c according to this example) indicating which areas the slab 2c occupies in at least one direction x, z orthogonal to the conveying direction y. Here, the longitudinal direction of the slab 2c is represented by x, and the thickness direction is represented by z. For example, the derivation means 8 can preset at which position the respective slab 2c starts, and how long it is or where it ends, viewed in the longitudinal direction x. Alternatively or additionally, the deriving means 8 can preset the thickness of the slab 2 c.

Subsequently, in step S2, it is derived that the device 8 receives information I2 for the preceding slab 2 (i.e. the slab 2b according to this example) indicating which areas the slab 2b occupies in at least one direction x, z orthogonal to the conveying direction y. The information I2 can in particular be of the same type as the information I1, starting from its type. However, the specific value is separate for the slab 2 b.

Subsequently, in step S3, it is derived that the device 8 receives, for the subsequent slab 2 (i.e. the slab 2d according to this example), information I3 indicating which areas the slab 2d occupies in at least one direction x, z orthogonal to the conveying direction y. The information I3 can also be of the same type as the information I1, starting from its type. However, the specific values are also individual here for the slab 2 b.

In step S4, the deriving device 8 derives the adjustment a of the rolling stand 4, 6 carrying out the rolling pass for at least one rolling pass of the slab 2c from the information I1, I2 received thereby. In step S4, the adjustment a is derived without achieving the temperature distribution of the slab 2 c. However, the deriving means 8 take into account the area occupied by the slab 2b with respect to the slab 2c when deriving the adjustment a of the slab 2 c. Alternatively or additionally, the deriving means 8 take into account the area occupied by the slab 2d with respect to the slab 2 c. In step S5, the deriving device 8 sends the derived adjustment a to the control devices 5, 7 of the rolling stands 4, 6 that are performing the rolling pass.

Purely theoretically, it is of course also possible to derive a temperature profile for the respective slab 2. However, if this is done, the resulting temperature distribution is not taken into account or utilized in the context of deriving adjustment a.

In order to be able to carry out the derivation of the respective adjustment a without the prior derivation of the temperature distribution, the derivation device 8 must in particular know which adjustment a (output variable) is required for the superimposition of the respective slab 2c with the preceding and/or following slabs 2b, 2d (input variables) in order to roll the respective slab 2c as desired (for example, while avoiding curvature or hooking or while compensating for profile changes that may occur). For example, the correlation can be derived by means of an evaluation performed offline on the data, wherein the data are detected over a longer period of time. Alternatively or additionally, the association can be derived by means of a suitable learning algorithm (if appropriate also online). The detection required for the learning process in this case is generally known, for example, by formed hooks or formed arcs, contours or spirals.

For example, the deriving device 8 can derive the adjustment a of the rolling stand 4 or the rolling stand 6 for the rolling slab 2c by means of multidimensional linear regression. The regressive input variable can be, for example, the leading and/or trailing portion of a slab 2c exceeding the (positive or negative) excess portion of the preceding slab 2b, and in a similar manner can be the leading and/or trailing portion of a slab 2c exceeding the (positive or negative) excess portion of the following slab 2 d. In a similar manner, the thickness d of the slabs 2c, 2b, 2d can also be accepted. Alternatively, it can be derived by means of a non-linear approximation by means of multidimensional polynomials or splines. The input variables for the non-linear approximation can be the same as in the case of regression. Alternatively, the derivation can also be carried out by means of a neural network. The output variable is in each case the respective adjustment a of the respective rolling stand 4, 6 for rolling the slab 2c in the respective rolling pass.

Due to the fact that the stand controllers 5, 7 take into account the transmitted adjustment a when rolling the respective slab 2c, the boundary conditions are obtained that the device 8 has to carry out the processing of fig. 2 on-line and in real time. In particular, the derivation of the adjustment a must be carried out and ended at the latest when the respective slab 2c is transported out of the furnace 1.

Fig. 3 shows the design from fig. 2. In the context of the embodiment of fig. 3, steps S11 and S12 are additionally present. Further, step S4 is replaced by step S13.

In step S11, the derivation means 8 additionally receive the information I4, from which it is derived what distance a the slab 2b has from the slab 2c, viewed in the conveying direction y. In a similar manner, the deriving device 8 receives in step S12 information I5 indicating what distance a' the slab 2d has from the slab 2c, viewed in the conveying direction y. In general, there is step S12 in addition to step S11. In individual cases, an alternative to step S11 can exist. In step S13, the deriving means 8 derive (based on the method previously in step S4) the adjustment a for the respective rolling pass. However, the derivation means additionally also takes into account the distance a, a 'or at least one of the distances a, a'. The required associated learning can be derived (as before) by means of data evaluation performed offline or online, wherein the data are detected over a longer period of time.

The process of fig. 2 can also be supplemented by further embodiments, wherein the embodiments can also be combined with one another or with the embodiment of fig. 3, if desired.

For example, it is possible, for example, according to the illustration in fig. 4, that the derivation means 8 can receive a further parameter P in an additional step S21, which further parameter describes the respective slab 2c itself. Examples of such parameters P are, in particular, the width b of the respective slab 2C, its chemical composition C and the initial temperature T0 at which the respective slab 2C is fed to the furnace 1. In this case, by step S22 instead of step S4, in step S22 (in addition to the measures of step S4), the deriving means 8 also consider the parameter P in common when deriving the adjustment a. If necessary, the deriving means 8 can also take into account the respective parameters P of the preceding slab 2b and of the subsequent slab 2d when deriving the adjustment a.

It is also possible, according to the diagram in fig. 5, to conclude that the device 8 receives the furnace temperature T and/or the residence time Δ T of the slab 2 in the furnace 1 in an additional step S31. In this case, by step S32 instead of step S4, it is derived in step S32 that the device 8 takes into account the furnace temperature T and/or the dwell time Δ T together when deriving the adjustment a (in addition to the measures of step S4).

The adjustment a can be an absolute value ("the rolling stand 4, 6" should be set to this adjustment) or a relative value ("the adjustment of the rolling stand 4, 6 should change this value with respect to the adjustment for the slab 2 to be pre-rolled"). In both cases, however, the adjustment a derived by the deriving means 8 is typically spatially resolved in the width direction of the respective slab 2. In particular, the resulting adjustment a can define a wedge adjustment δ s (i.e. an asymmetric setting of the roll gap) and/or a roll bending B.

In order to convert the resulting adjustment a into a manipulated variable for the roll stands 4, 6, the stand controllers 5, 7 can derive from the adjustment a the roll bending B, the wedge adjustment δ s, the total rolling force F and the rolling force difference δ F. From the illustration in fig. 6, the roll bending B describes the degree of symmetrical bending of the work rolls 11 of the respective roll stand 4, 6. According to the diagram in fig. 7, the wedge adjustment δ s describes the degree of asymmetrical arrangement of the working rolls 11 of the respective roll stand 4, 6. According to the diagrams in fig. 6 and 7, the total rolling force F is evenly distributed on the operating side and on the drive side of the respective rolling stand 4, 6, the rolling force difference δ F being fed to the side with the positive sign and to the side with the negative sign. The processing modes of fig. 6 and 7 can be combined with each other. The processing modes are shown separately from one another in fig. 6 and 7 only for clarity. With regard to the derivation of the manipulated variables from the adjustment A itself, reference can be made to WO 2012/159849A 1 already mentioned.

Alternatively or additionally, other actuators can also be influenced accordingly, for example roll shifting or roll staggering or local cooling in the width direction of the respective roll stand 4, 6 and/or heating of the working rolls 11 of the respective roll stand 4, 6 or the temperature influence on the respective slab 2c shortly before or shortly after the respective roll stand 4, 6, for example by means of sectional cooling or by means of edge heating.

Preferably, the deriving means 8 derive the adjustment a of the rolling stands 4, 6 as a function of position in the longitudinal direction of the respective slab 2c or as a function of time. In this case, the stand controllers 5, 7 can accordingly take into account the adjustment a of the respective rolling stand 4, 6 transmitted to the stand controllers. In principle, the same variables as explained before in connection with fig. 6 and 7 can be derived. However, the difference is that the resulting adjustment a is now spatially resolved in the longitudinal direction of the respective slab 2. Furthermore, since the respective slab 2c is fed to the respective roll stand 4, 6 at a speed v according to the diagram in fig. 1, the respective adjustment a of the respective roll stand 4, 6 can also be defined as a function of time. This is equivalent to a spatial resolution in the longitudinal direction of the respective slab 2c, given the known velocity v.

Different processing methods are possible for presetting the information I1, I2, I3 and possibly I4, I5 and/or P for the deriving means 8. Thus, for example, it is possible to implement steps S1 to S3 and, if appropriate, steps S11, S12 and/or S21 in such a way that the charging data B1 of the furnace 1, which describes the charging of the furnace 1 with slabs 2, is received by the tapping device 8. In this case, at least the area occupied by the respective slab 2 orthogonal to the transport direction y is derived from the loading data B1. For example, the charging data B1 can indicate whether the respective slab 2 is fed to the furnace 1 horizontally, horizontally or centrally, viewed transversely to the direction of feed. If necessary, further information can also be derived from the filling data B1, such as the width B of the slab 2, its chemical composition C, its initial temperature T0 and its spacing a, a' from one another in the transport direction y. Alternatively, a sensor 12 can be present according to the representation in fig. 1, which detects the sensor data D and feeds the data D to the derivation means 8. In this case, the deriving means 8 are able to derive the corresponding information I1, I2, I3 and possibly also I4, I5 from the data D. Suitable sensors 12 are generally known to those skilled in the art. Purely exemplary are a camera, an ultrasonic sensor and a laser sensor.

The present invention has many advantages. It is possible in particular to counteract the formation of hooks or arcs in the first rolling pass of the slab 2 and also from the beginning. Furthermore, when a spatially resolved course in the longitudinal direction of the blank 2 is obtained for the adjustment a, it is possible to very effectively counteract hook formation or curvature formation and, if appropriate, profile changes. The derived method can be easily integrated into the real-time operation of the furnace 1 and of the roll stands 4, 6.

It is even possible to carry out the respective derivation beforehand purely arithmetically with the charging of the furnace 1 beforehand and then to purely arithmetically change the charging of the furnace 1 with slabs 2 for the purpose of optimization. In this case, the subsequent actual charging of the furnace 1 with the slabs 2 takes place according to the values previously found as optimal. For example, the sequence of slabs 2 can be changed in the filling phase. For example, the optimization objective can be an approximation of the smallest possible wedge adjustment δ s for at least one rolling pass and/or the target value of the roll bending B of the work roll 11 in at least one rolling pass.

Furthermore, it is readily possible for the post-learning or adaptation derivation means 8 to derive the corresponding method of adjustment a. For this purpose, it is merely necessary to detect the resulting hook or curvature or profile change, for example in a measurement-related manner, on the exit side of the respective roll stand 4, 6 and to supply it to the learning algorithm.

Although the invention has been illustrated and described in detail by means of preferred embodiments, the invention is not limited by the disclosed examples and other variants can be derived therefrom by the person skilled in the art without departing from the scope of protection of the invention.

List of reference numerals

1 furnace

1a furnace entrance

1b conveying device

1c heating device

1d furnace outlet

2. 2a to 2e slabs

3 furnace controller

4. 6 rolling mill frame

5. 7 rack controller

8 derive the device

9 computer program

10 machine code

11 work roll

12 sensor

A adjustment

a. a' spacing

B roll bending

b width of

Bl charge data

C chemical component

D data

d thickness

F total rolling force

I1 to I5 messages

1 length

P parameter

S1-S32 steps

T furnace temperature

T0 initial temperature

Direction of x rolling

y direction of conveyance

z thickness direction

Delta F rolling force difference

Delta s wedge adjustment

At dwell time.