DE102021207947A1 - Method and device for producing a metallic strip - Google Patents

Abstract

The invention relates to a method for producing a metal strip, the strip being rolled out of a slab (3) in a rolling train (1) by means of a number of rolling stands (2), the slab (3) to be rolled consisting of individual partial slabs (3a , 3b) is assembled, the individual partial slabs (3a, 3b) being assembled in a slab connecting device (4), in which a section (5) of the partial slab (3a) lying at the front in the rolling direction (R) and a section of the (R) the partial slab (3b) at the rear is separated and the two partial slabs (3a, 3b) are joined at the separation point (6). In order to enable improved monitoring of the production process of the strip and to react as early as possible to defects in the preliminary product (slab or pre-strip), the invention provides that after the separation and before the joining of the two partial slabs (3a, 3b), at least one of the two partial slabs (3a, 3b) takes place at the separation point (6). Furthermore, the invention relates to a device for producing a metallic strip.

Description

The invention relates to a method for producing a metal strip, wherein the strip is rolled out of a slab in a rolling train by means of a number of roll stands, the slab to be rolled being assembled from individual partial slabs, the individual partial slabs being assembled in a slab connecting device, in which a section of the partial slab lying at the front in the rolling direction and a section of the partial slab lying at the rear in the rolling direction are separated and the two partial slabs are joined at the separation points. Furthermore, the invention relates to a device for producing a metallic strip.

For example from the WO 2017/140886 A1 it is known to produce steel strips in a casting-rolling plant in semi-endless rolling or in endless rolling by producing slabs in one or more casting machines, which are connected to one another before the rolling train. To this end, the document mentioned describes a slab connecting device with which two slabs arranged one behind the other can be connected to one another. This is done here by a friction welding process in which the two slabs to be connected oscillate relative to each other and are pressed against each other.

When slabs are mentioned here and below, this also includes pre-strips, which are connected to one another accordingly in order to be able to roll them out in a continuously operating rolling process.

When rolling a strip, it is always important that defined process conditions are maintained so that a high degree of process reliability can be ensured. Equally, the quality of the strip to be rolled can be guaranteed in this way. It is sometimes difficult to collect the relevant data in order to influence the rolling process accordingly, preferably in a controlled process.

The invention is based on the object of developing a method of the type mentioned at the outset and providing a corresponding device with which it is possible to enable improved monitoring of the manufacturing process of the strip and to detect defects in the preliminary product (slab or opening band) to react. This is intended to increase the quality of the tape produced.

The achievement of this object by the invention is characterized in that after the separation and before the joining of the two partial slabs, at least one of the two partial slabs is measured at the point of separation.

Rolling in the rolling train preferably takes place in a continuous process.

The measurement of the part slab can include a detection of geometric parameters of the part slab at the point of separation, in particular the detection of the cross-sectional profile and/or the wedge shape of the part slab.

Alternatively or additionally, the measurement of the part slab can also include a detection of properties of the surface of the part slab at the point of separation, in particular the detection of surface defects and/or the microstructure and/or the presence of scale.

Furthermore, the measurement of the partial slab can alternatively or additionally include a detection of the temperature and/or the temperature distribution of the partial slab at the point of separation.

Finally, the measurement of the part slab can alternatively or additionally also include a detection of the chemical composition of the part slab at the point of separation, in particular the solution state or precipitation state of elements.

The data obtained from the measurement are preferably fed to a controller, which generates control data for the rolling process from the measurement data and outputs them to the rolling train.

In this case, it is provided in particular that the control data output to the rolling train are those relating to heating elements or cooling elements upstream, in and/or downstream of the rolling train.

Alternatively or in addition, the control data output to the rolling train can be data relating to the rolling speed.

Alternatively or additionally, the control data output to the rolling train can also be data relating to the size of the passes (i.e. the size of the roll gap) in the individual roll stands.

Finally, as an alternative or in addition, the control data output to the rolling train can also be data that affects the settings of the actuators influencing the geometry of the strip, such as shifting positions of the rolls, bending forces on the rolls and relative positions of the work rolls to each other (geometry of the roll gap).

Comparative data can be stored in the controller, with the control data being generated by taking the comparative data into account. In particular, the use of methods of artificial intelligence is intended. Examples of such artificial intelligence methods are neural networks, adaptive algorithms, evolutionary algorithms, genetic algorithms, or the like. Are known in this regard and therefore do not need to be described further here, for example Bayesian reliability networks (Bayesian belief network), decision trees (decision tree), hidden Markov models, case-based reasoning (case-based reasoning), k-nearest neighbors, themselves self-organizing maps, case-oriented learning (instance-based learning), support vector machines (support vector machines), artificial neural networks (ANN: artificial neural network), recurrent neural networks (RNN: recurrent neural network), deep neural networks ( DNN: deep neural network) or convolutional neural networks (CNN: convolutional neural network). Combinations of these methods can also be used.

The device for producing a metallic strip, comprising a rolling train in which the strip can be rolled out of a slab by means of a number of rolling stands, and a slab connecting device with which the slab to be rolled can be assembled from individual partial slabs, the slab connecting device comprising cutting means , with which a section of the partial slab lying at the front in the rolling direction and a section of the partial slab lying at the rear in the rolling direction can be separated, as well as connecting means for joining the two partial slabs at the separation point is characterized according to the invention by measuring means with which a measurement of at least one of the two partial slabs is carried out the separation point can take place.

The measuring means can include at least one tactile measuring element, with which geometric variables of the partial slab can be detected at the point of separation. Alternatively or additionally, the measuring means can also include at least one non-contact measuring element, in particular a laser measuring means, with which geometric variables of the part slab can be detected at the separation point.

Provision can furthermore be made for the measuring means to be temperature measuring means, with which the temperature and/or the temperature distribution of the partial slab at the point of separation can be recorded.

The measuring device is preferably connected to a controller, the controller being designed to generate control data for the rolling process from the measurement data from the measuring device and to output this data to the rolling train. In this case, it is preferably provided that the controller is connected to at least one heating element, to at least one cooling element, to a means for adjusting the rolling speed and/or to at least one means for adjusting the roll gap of a roll stand.

At least one cutting device, in particular shears, can be arranged between the rolling train and a coiler that follows in the direction of rolling, with the at least one cutting device cutting off sections of the rolled strip that are scrap or that contain material that does not meet a predetermined specification. With the mentioned cutting device (scissors) a cut can be made in front of the coiler, with which waste can be minimized or material that is not according to specification can be removed.

The mentioned measurement in the area of the separation point of the partial slab can be carried out directly on the exposed (through the cut) cross section of the partial slab, which is present due to the cutting process before welding together; however, a further section of the partial slab adjoining it in the rolling direction can also be considered (e.g. when the temperature of the upper side and the underside of the partial slab is to be recorded).

According to the present concept, measuring instruments are installed in the area of the slab connecting device and there preferably in the immediate vicinity of the separating device and the joining device. In this way, the area of the slab that is not influenced by the joint (weld), in particular the thin slab or the pre-strip, can be considered. If the temperature distribution is measured in the area of the separation point, for example on the surface of the cutting plane, this also has a significant significance for the areas that are not in the immediate vicinity of the separation point. Thus, the proposed concept uses the possibility of acquiring measured values that would not be available without using the slab connecting device; on the contrary, said surface only becomes accessible for a measurement as a result of the separating cut.

According to the present proposal, an endless rolling method is thus made possible in which a slab joining device is used, it being possible to achieve homogeneous product properties in the finished strip through the proposed procedure.

Provision is therefore made for connecting (thin) partial slabs or pre-strips by means of the slab connecting device, with the use of additional measuring devices being able to record data in a particularly advantageous manner and then, if necessary, directly influencing the actuators of the rolling train in order to meet the technical requirement for sufficiently homogeneous product properties . The process can be used in conventional hot strip mills or in casting and rolling plants (CSP plants).

This makes it possible on the one hand to ensure an endless rolling process with the known advantages (such as increased uniformity, reproducibility and stability) and on the other hand to react to process disturbances by means of the measurements and subsequent calculations, controls or regulations, so that targeted process changes the desired and specified product properties can be reliably and reproducibly set or exceeded despite deviations during the previous process stages.

In particular, friction welding devices are used as the slab joining device, as in the above-mentioned WO 2017/140886 A1 are described.

With the slab joining device in a conventional hot strip mill or a casting and rolling plant, pre-strips or thin slabs can thus be joined and then rolled together.

• 1 schematisch eine Anlage zur Herstellung eines metallischen Bandes, wobei hinter zweier Tunnelöfen eine Brammenverbindungsvorrichtung angeordnet ist sowie hinter derselben eine Walzstraße, und
• 2 schematisch zwei Teilbrammen, die sich in der Brammenverbindungsvorrichtung befinden, wobei von der vorderen Teilbramme ein Abschnitt abgeschnitten wurde und an dieser Teilbramme ein Messvorgang vorgenommen wird.

In the drawing an embodiment of the invention is shown. Show it:

• 1 schematically shows a plant for the production of a metallic strip, with a slab connecting device being arranged behind two tunnel furnaces and a rolling train behind the same, and
• 2 schematically shows two partial slabs that are located in the slab connecting device, with a section being cut off from the front partial slab and a measurement process being carried out on this partial slab.

In 1 a system is shown schematically with which a steel strip can be produced.

First, a slab of a certain length is produced in each of two casting machines 10 . The slabs enter a tunnel furnace 11 in which they are kept at a defined temperature. Downstream in the rolling direction R is a rolling train 1 which has a number of rolling stands 2 . A slab connecting device 4 is located between the end of the tunnel furnace 11 and the rolling train 2. This serves to connect the slabs from the tunnel furnaces 11 to one another and to guide them into the rolling train 1, so that a continuous rolling process can take place in the rolling train, the is generally advantageous in terms of process stability and the quality of the strip to be produced.

• Zunächst kann im Batch-Modus gefahren werden (Einzelbrammenwalzen, einzelne Brammen aus einer oder mehreren Gießmaschinen).

In general, the following three production modes are possible when using the slab connecting device:

• Initially, batch mode can be used (single slab rolling, individual slabs from one or more casting machines).

It is also possible to run in semi-endless mode (multiple slab rolling, multiple slabs from one or more casting machines).

Finally, it is possible to run in endless rolling mode (welded slabs from two or more casting machines).

Irrespective of the relationship between the total speed of the existing strands and the rolling speed, the rolling of welded slabs is referred to as an endless rolling mode. Depending on the number of welded strips or slabs, only the length of the endless sequence changes. This is all the longer, the more the absolute value of the quotient of total casting speed and rolling speed approaches the value "1".

mit:

• i_ENDLOS: Anzahl der möglichen Brammen in einer Sequenz beim Endlos-Walzen
• i_MAX: Maximale Anzahl von Brammen im Tunnelofen (Start der Endlos-Walzsequenz)
• i_MIN: Minimale Anzahl von Brammen im Tunnelofen (Ende der Endlos-Walzsequenz)
• i_G: Anzahl der Gießmaschinen
• v_G: Gießgeschwindigkeit
• vw: Walzgeschwindigkeit

Here the mass flow condition can be used: $${\text{i}}_{\text{ENDLESS}}=\frac{{\text{i}}_{\text{MAX}}-{\text{i}}_{\text{MIN}}}{\left|1-{\text{i}}_{\text{G}}\frac{{\text{V}}_{\text{G}}}{{\text{V}}_{\text{W}}}\right|}$$

with:

• i _ENDLESS : Number of possible slabs in a sequence in endless rolling
• i _MAX : Maximum number of slabs in the tunnel furnace (start of the endless rolling sequence)
• i _MIN : Minimum number of slabs in the tunnel furnace (end of endless rolling sequence)
• i _G : number of casting machines
• v _G : pouring speed
• vw: rolling speed

In contrast to the casting-rolling concepts, there is no fixed link between the process stages of casting and rolling in endless rolling. It can thus be rolled endlessly without there being an additional endless process in which the rolled strip is connected to the slab of the casting machine.

From the point of view of the entire casting and rolling plant, only two operating modes are in use, namely the batch mode and the semi-endless mode.

In contrast to the semi-endless mode, as known from CSP plants, there is no reduction in the production volume in endless rolling after the slabs have been welded, because both casting strands can be operated at a high or unchanged high casting speed.

In general, the aim is for the strip to be produced to have as homogeneous a property as possible, both over its length, its width and its thickness.

Constant process conditions during hot rolling and thus constant properties after hot rolling are characteristic features of endless processes and generally lead to increased process stability in the subsequent processing steps and to higher product quality afterwards. This applies to geometry, surface quality and material properties, among other things. All of these properties are almost constant over the tape length, tape width and tape thickness, which also means that the usual large deviations at the tape head and tape end are avoided.

In order to ensure this according to the invention, the following is provided:

In 2 is shown schematically how in the slab connecting device 4 two slabs 3, namely a partial slab 3a at the front in the rolling direction R and a partial slab 3b at the rear in the rolling direction, are connected to one another in order to be fed to the continuous rolling process in the rolling train 1.

For this purpose, cutting means 8 are provided in the slab connecting device 4, in particular designed as punching shears, with which the rear end of the partial slab 3a and the front end of the partial slab 3b can be trimmed. For the partial slab 3a lying at the front, a section 5 is shown which was severed by means of the cutting means 8. As a result, there is now a smooth face 12 of the front partial slab 3a at the separation point 6 . The same applies to partial slab 3b, although this is 2 is not shown.

It is essential to the invention that after the separation and before the joining of the two partial slabs 3a, 3b, as in 2 shown, at least one of the two partial slabs 3a, 3b is measured at the separation point 6. For this purpose, reference is made to the schematically indicated measuring means 9 which, for example, can measure the end face 12 geometrically.

In a similar way, however, it is also possible for the measuring means to be in the form of temperature measuring means which record the course of the temperature over the width and the height of the partial slab 3a. This temperature profile is characteristic, in particular before the welding process that is still taking place, also for the area of the partial slab 3a that is further forward.

As shown in the figures, the measuring means 9 supply information to a controller 7, which in turn can influence the rolling train 1, as is shown in 1 is indicated.

The combination of high-resolution measurement methods and special calculation methods based on physical models and/or artificial intelligence offers the possibility of detecting, analyzing and eliminating deviations from the specified process conditions within the framework of a real-time analysis, i.e. unexpected continuous or discontinuous, regular or sporadic process disturbances to react immediately, so that through targeted process changes based on powerful controls and regulations, the specified product properties can be set reliably, reproducibly and constantly despite deviations during the previous process stages.

• Es kann die Geometrie der Dünnbramme oder des Vorbandes ermittelt werden, insbesondere das Profil und die Keiligkeit.

In particular, the following measured variables, which have an influence on the rolling stability on the one hand and the product quality on the other hand, can be recorded by measuring means 9:

• The geometry of the thin slab or the pre-strip can be determined, in particular the profile and the wedge shape.

The surface condition of the thin slab or the pre-strip can be recorded, in particular surface defects, the condition and the uniformity of scale.

The temperature distribution on the top and bottom of the thin slab or the pre-strip can be recorded.

The temperature distribution on the top and bottom of the thin slab or pre-strip can be recorded after descaling the surface.

The temperature distribution in the cutting plane (face) of the thin slab or the pre-strip can be recorded.

The chemical composition on the top and bottom and/or in the cutting plane (end face) of the thin slab or the pre-strip can be recorded.

The microstructure on the top and bottom and/or in the cutting plane (end face) of the thin slab or the pre-strip can be recorded.

The solution state or precipitation state of certain elements on the upper and lower side and/or in the cutting plane (end face) of the thin slab or the pre-strip can be recorded.

A probe can be used to inspect the area near the weld or at the point of separation, or a laser can be used, which is projected onto the surface and the cut surface. This allows differences to a reference state to be determined, particularly with regard to possible deformations.

As part of a detailed analysis of the measured values obtained in this way, conclusions can be drawn about the process, in particular using physical models and/or various methods of artificial intelligence; it is also possible to predict the effects on the strip properties and, as far as possible, on the later product properties and to assess the need for interventions.

• Betreffend die Geometrie: Wie wirken sich die gemessenen Anomalien hinsichtlich Profil und Keiligkeit und die daraus mittels Berechnungen abgeleiteten relevanten Größen, mit deren Hilfe der Zustand des Bands im Hinblick auf Profil und Planheit und teilweise auch Bandlauf und Walzstabilität umfassend charakterisiert werden kann, auf das Verhalten während der folgenden Prozessschritte und die Eigenschaften von Zwischen- und Endprodukt aus?
• Betreffend die Temperatur: Wie wirken sich die gemessenen Temperaturverteilungen und die daraus mittels Berechnungen abgeleiteten relevanten Größen, mit deren Hilfe der Zustand des Bands im Hinblick auf Profil und Planheit und teilweise auch Bandlauf und Walzstabilität umfassend charakterisiert werden kann, auf das Verhalten während der folgenden Prozessschritte und die Eigenschaften von Zwischen- und Endprodukt aus?
• Betreffend die Werkstoffeigenschaften: Wie wirken sich die gemessenen Abweichungen der Werkstoffeigenschaften und die daraus mittels Berechnungen abgeleiteten relevanten Größen, mit deren Hilfe der Zustand des Bands im Hinblick auf Umformfestigkeit und Verformbarkeit, auf Verfestigungs- und Entfestigungsverhalten und teilweise auch auf Bandlauf und Walzstabilität umfassend charakterisiert werden kann, auf das Verhalten während der folgenden Prozessschritte und die Eigenschaften von Zwischen- und Endprodukt aus?

In particular, answers to the following questions can be derived:

• Regarding the geometry: How do the measured anomalies with regard to profile and wedgeness and the relevant parameters derived from them by means of calculations, with the help of which the condition of the strip can be comprehensively characterized with regard to profile and flatness and sometimes also strip running and rolling stability, affect the behavior during the following process steps and the properties of the intermediate and end product?
• Regarding the temperature: How do the measured temperature distributions and the relevant variables derived from them by means of calculations, with the help of which the condition of the strip can be comprehensively characterized in terms of profile and flatness and sometimes also strip running and rolling stability, affect the behavior during the subsequent process steps and the properties of the intermediate and end products?
• Regarding the material properties: What is the effect of the measured deviations in the material properties and the relevant variables derived from them by means of calculations, with the help of which the condition of the strip can be comprehensively characterized in terms of formability and deformability, hardening and softening behavior and, in some cases, strip running and rolling stability can affect the behavior during the following process steps and the properties of the intermediate and end product?

If a surface defect is detected, the position at the time of a measurement can be determined by means of tracking when the coil is being unwound. Based on the analysis of the measurement, statements can be made about the origin or time of occurrence of the defect. This may only be possible after the analysis of numerous similar or related processes, so that at this point in particular suitable methods and algorithms from the field of artificial intelligence are used, which enable the derivation of suitable measures and interventions, provided that there are sufficiently large amounts of measured values are present and, as a result, increasingly recurring patterns can be recognized.

• Heizelemente (wie beispielsweise induktive Heizungen oder Strahlrohre) oder Kühlelemente wie beispielsweise Zwischengerüstkühlungen können dazu verwendet werden, Temperaturunterschiede über der Bandlänge auszugleichen und damit die Walzbedingungen möglichst konstant zu halten.

As already explained, the measured values recorded are routed from the measuring means 9 to the controller 7 and processed here. The following interventions in particular can then be carried out with the aid of the available actuators, which are acted upon by the controller 7:

• Heating elements (such as inductive heaters or radiant tubes) or cooling elements such as interstand cooling can be used to compensate for temperature differences over the strip length and thus keep the rolling conditions as constant as possible.

Heating elements (such as inductive heaters or radiant tubes) or cooling elements such as interstand cooling can be used to compensate for temperature deviations due to incorrect or incorrect setup.

Heating elements (such as inductive heaters or radiant tubes) or cooling elements such as interstand cooling can be used to compensate for or mitigate temperature deviations due to process deviations or process disturbances (e.g. furnace temperature, residence time in the furnace) or general process deviations (e.g. chemical composition, geometry).

Heating elements (such as inductive heaters or radiant tubes) or cooling elements such as interstand cooling can be used to compensate for regular or sporadic temperature discontinuities resulting from the upstream process steps (e.g. clamping when cutting and welding the two partial slabs 3a, 3b; support areas in the reheating furnace) or to mitigate

Heating elements (such as inductive heaters or radiant tubes) or cooling elements such as interstand coolers may be used to compensate for or mitigate variations in the amount and/or nature of the scale formed.

Increasing or reducing the rolling speed can compensate for temperature differences over the length of the strip and thus keep the rolling conditions as constant as possible or increase or decrease the overall temperature level.

If, for example, the temperature on the upper side and/or underside of the partial slab is found to be too low at the point of separation, or if the temperature averaged over the measured cross section of the end face of the partial slab is too low, this measurement result can be processed by the control unit 7 after it has been fed to it that the rolling speed is increased in order to prevent excessive cooling of the slab to be rolled. In the opposite case (temperature too high), the rolling speed can be reduced.

A change in the removal distribution in the finishing line can be carried out in order to influence the hardening and softening behavior and thus compensate for or mitigate the influence of deviations in temperature, chemical composition, microstructure and the solution state or precipitation state of certain elements.

Actuators such as shift positions of the rolls, bending forces on the rolls and relative positions of the work rolls to each other (geometry of the roll gap) can be used to influence the geometry of the strip in the roll gap and the mass flow conditions in the roll gap and consequently the stability of the rolling process to avoid deviations to compensate or mitigate, for example, with regard to profile and flatness.

The cutting means integrated into the slab joining device can also be used to cut material that either comes from process-related transition areas (e.g. change of geometry or material, start-up processes, etc.) or for other reasons does not meet the requirements and specifications (i.e. scrap). , to remove before rolling.

The cutting means (shears) in front of the coiler, which divides the finished strip into individual pieces after endless rolling in rolling train 1 and thus initiates a discontinuous process again, can be used in such a way that the area of the strip that is exposed as a result of the welding process shows the greatest deviations from the required properties, is located in that part of the coil which is later removed and not used, i.e. usually the outer turns. In addition, material that does not meet the respective requirements or cannot be used sensibly in the subsequent processes can be removed by these as well as by the shears arranged further forward.

Since casting and rolling are not tightly coupled in the present concept, the rolling speed can be increased or decreased if this is necessary to achieve the required product properties. Endless rolling is also possible if the rolling speed is higher or lower than the cumulative casting speed.

The following should also be noted with regard to the nomenclature with regard to the term slab used: This term is to be understood here in general terms.

The term "slab" is usually used for the material before the roughing stand, after which it is roughing strip. Belts are then spoken of in and after the finishing mill. Strips are made from thin slabs in a CSP plant. In the present case, the material before the finishing train is primarily meant. However, slabs in the actual sense can also be treated according to the invention.

Reference List

1

rolling mill

2

mill stand

3

slab or pre-strip

3a

partial slab

3b

partial slab

4

slab connecting device

5

Section of the front partial slab

6

separation point

7

steering

8th

Cutting agent (punching shears)

9

measuring equipment

10

casting machine

11

tunnel kiln

12

face

R

rolling direction

QUOTES INCLUDED IN DESCRIPTION

This list of the documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• WO 2017140886 A1 [0002, 0028]

Claims (18)

Method for producing a metal strip, the strip being rolled out of a slab (3) in a rolling train (1) by means of a number of rolling stands (2), the slab (3) to be rolled being composed of individual partial slabs (3a, 3b). the individual partial slabs (3a, 3b) are assembled in a slab connecting device (4), in which a section (5) of the partial slab (3a) lying at the front in the rolling direction (R) and a section of the partial slab (3a) at the rear in the rolling direction (R). lying partial slab (3b) is separated and the two partial slabs (3a, 3b) are joined at the separation point (6), characterized in that after the separation and before the joining of the two partial slabs (3a, 3b), at least one of the two partial slabs is measured (3a, 3b) takes place at the separation point (6). procedure after claim 1 , characterized in that the rolling in the rolling train (1) takes place in a continuous process. procedure after claim 1 or 2 , characterized in that the measurement of the part slab (3a, 3b) includes a detection of geometric parameters of the part slab (3a, 3b) at the separation point (6), in particular the detection of the cross-sectional profile and/or the wedge shape of the part slab (3a, 3b) . procedure after claim 1 or 2 , characterized in that the measurement of the part slab (3a, 3b) includes a detection of properties of the surface of the part slab (3a, 3b) at the separation point (6), in particular the detection of surface defects and/or the microstructure and/or the presence from Tinder. procedure after claim 1 or 2 , characterized in that the measurement of the partial slab (3a, 3b) comprises a detection of the temperature and/or the temperature distribution of the partial slab (3a, 3b) at the point of separation (6). procedure after claim 1 or 2 , characterized in that the measurement of the partial slab (3a, 3b) includes a detection of the chemical composition of the partial slab (3a, 3b) at the separation point (6), in particular the solution state or precipitation state of elements. Procedure according to one of Claims 1 until 6 , characterized in that the data obtained from the measurement are supplied to a controller (7) which generates control data for the rolling process from the measurement data and outputs them to the rolling train (1). procedure after claim 7 , characterized in that the control data output to the rolling train (1) are those relating to the heating elements or cooling elements in front of, in and/or behind the rolling train (1). procedure after claim 7 or 8th , characterized in that the control data output to the rolling train (1) are those relating to the rolling speed. Procedure according to one of Claims 7 until 9 , characterized in that the control data output to the rolling train (1) are those relating to the size of the passes in the individual roll stands (2). Procedure according to one of Claims 7 until 10 , characterized in that comparison data are stored in the controller (7) and that the control data are generated by taking the comparison data into account, in particular using methods of artificial intelligence. Procedure according to one of Claims 1 until 11 , characterized in that at least one cutting device, in particular shears, is arranged between the rolling train (1) and a coiler that follows in the rolling direction (R), with the at least one cutting device being used to cut off sections of the rolled strip that are scrap or which Contain material that does not meet a given specification. Device for producing a metallic strip, comprising a rolling train (1) in which the strip can be rolled out of a slab (3) by means of a number of rolling stands (2), and a slab connecting device (4) with which the slab ( 3) can be assembled from individual partial slabs (3a, 3b), the slab connecting device (4) comprising cutting means (8) with which a section (5) of the partial slab (3a) lying at the front in the rolling direction (R) and a section of the in Rolling direction (R) rear part slab (3b) can be separated, as well as connecting means for joining the two part slabs (3a, 3b) at the separation point (6), in particular for carrying out the method according to one of Claims 1 until 11 characterized by measuring means (9) with which at least one of the two partial slabs (3a, 3b) can be measured at the separation point (6). device after Claim 13 , characterized in that the measuring means (9) comprises at least one tactile measuring element, with which a detection of geometric variables of the partial slab (3a, 3b) at the separation point (6) can take place. device after Claim 13 , characterized in that the measuring means (9) comprises at least one non-contact measuring element, in particular a laser measuring means, with which geometric parameters of the partial slab (3a, 3b) can be detected at the separation point (6). device after Claim 13 , characterized in that the measuring means (9) are temperature measuring means with which the temperature and/or the temperature distribution of the partial slab (3a, 3b) at the point of separation (6) can be recorded. Device according to one of Claims 13 until 16 , characterized in that the measuring means (9) are connected to a controller (7), the controller (7) being designed to generate control data for the rolling process from the measured data of the measuring means (9) and to transmit these to the rolling train (1st ) to issue. device after Claim 17 , characterized in that the controller (7) is connected to at least one heating element, to at least one cooling element, to a means for adjusting the rolling speed and/or to at least one means for adjusting the roll gap of a roll stand (2).

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