Method for operating a rolling mill

Abstract

Method for operating a rolling mill (1) comprising the steps: a) Recording at least one operating parameter as a measured actual value; and b) Identifying at least one volume or mass segment of a continuous rolled material (3) using the measured operating parameter and other operating parameters by integration; where at a given measuring point (M O , M1, M2, M3, M4, ..., M n ) at least one of the operating parameters is from the group rolled stock thickness, rolled stock width, rolled stock speed, rolled stock density and cross-sectional area of ​​the rolled stock (3) and is included in the identification as an unmeasured target value, characterized in that, after a segment has passed through at least one rolling stand (2) of the rolling plant (1) and the segment has been tracked by means of a measuring point (M) located downstream of the stand (2) in the direction of travel of the rolled material O , M1, M2, M3, M4, ..., M n) the effect of the rolling stand (2) on the segment is determined, and this determined effect of the rolling stand (2) is taken into account for a subsequently rolled segment or a subsequently rolled product.

Description

Technical field

[0001] The invention relates to a method for operating a preferably multi-stand rolling mill, in particular for tracking the material of a rolled product transported through the mill. State of the art

[0002] During the operation of rolling mills, properties of the rolled material are often recorded at various points using measuring sensors. To assign the measured values ​​to individual physical areas of the rolled material, a time-based segmentation of the material can be performed. In this process, the measurement data is sorted according to a time-controlled schedule, meaning that the data acquisition takes place within a fixed time grid. However, with this method, a correct assignment to physical segments is not guaranteed under all operating conditions. In particular, if changes in speed or geometric changes occur, such as a change in strip thickness, a correct physical assignment is not possible with this method.

[0003] The publication “Modeling and Simulation of Run-Out Table Cooling Control Using Feedforward-Feedback and Element Tracking System” in IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, VOL. 33, NO. 2, March / April 1997, pp. 304-311 by Remn-Min GUO discloses a method for tracking tape segments according to the preamble of claim 1. In particular, the position of a tape segment is determined by means of integration from an estimated tape velocity.

[0004] The object of the invention is to provide an efficient method for tracking selectable sections (segments) of a rolled material, such as a strip, during its passage through a rolling mill, with respect to the time and location of a segment within the mill. The terms rolled material and strip are used synonymously for the material to be rolled.

[0005] Preferably, the method should be applicable to different measurement equipment of rolling mills, especially for cost reduction in the face of increasing efficiency requirements.

[0006] Furthermore, it is advantageous to adjust the accuracy of the belt section / segment tracking to the desired or required precision, also taking into account the subsequent addition of operating parameters. The identification of the belt segments is supported by a mathematical procedure that evaluates measured values ​​and / or target values.

[0007] Further advantages of the invention lie in the possibility of initiating operating parameters, creating a warning system for downstream units, i.e., adapting the plant setting, facilitating the detection of defects and the analysis of process errors in a pre-unit, and supporting the adaptive learning of a higher-level program unit responsible for setting the rolling mill. Disclosure of the invention

[0008] The aforementioned problem is solved by the method according to claim 1.

[0009] Identification within the meaning of the invention is understood to mean the temporal assignment of a band segment to a location within the system; detection within the meaning of the invention is understood to mean the temporal assignment of a measurement or a target value to a measuring point within the system.

[0010] By using at least one unmeasured target value at a given measuring point, a corresponding measurement of that value can be omitted. Tests have shown that volume or mass segmentation still occurs with sufficient accuracy when using such target values ​​or reference values.

[0011] In the context of the invention, a setpoint is understood to be any value used to identify the volume segment that is not a direct measured value, for example, fixed parameters of the system or setpoints that can be preselected depending on the work process, or calculated setpoints such as roll thickness. In particular, a setpoint at a measuring point, as defined in the invention, can be a value that was measured at a previous measuring point. The term setpoint can be considered equivalent to a predetermined value or other operating parameter.

[0012] The invention may be directed to the following features of a method for operating a rolling mill: Identifying a volume segment at at least one measuring point by capturing and integrating at least one of the following combinations of measured and / or predefined operating parameters i) to v2): i) Measured cross-sectional area of ​​the belt, measured belt speed; ii) Target value for the cross-sectional area of ​​the belt, measured belt speed; iii) Target value for the cross-sectional area of ​​the belt, target value for belt speed; iv 1) Target bandwidth, measured tape thickness, measured tape speed; iv 2) Target bandwidth, measured tape thickness, target tape speed; v1) Target value tape thickness, measured tape width, measured tape speed. v2) Target value tape thickness, measured tape width, target value tape speed.

[0013] This method can therefore either be carried out on its own or understood as a preferred embodiment of the first-mentioned method.

[0014] The methods mentioned i)-v2) differ essentially in the number of signals or measured values ​​required for segmentation.

[0015] Measuring the operating parameters at multiple measuring points increases the accuracy of segment tracking, but at the cost of high equipment costs.

[0016] According to one embodiment, the cross-sectional area and speed of the belt can be measured at a first measuring point, and the belt speed can also be measured at further measuring points passed by the belt at a later time. Alternatively, the cross-sectional area can also be calculated simply by multiplying the material thickness by a constant belt width.

[0017] In another embodiment, in addition to the speed measurements, the measured values ​​of all cross-sectional areas at the subsequent measuring points are also required.

[0018] The latter two implementations require a corresponding increase in equipment complexity. If speed measurements are not available or intended for use at every measuring point, measured values ​​can be replaced by target values.

[0019] According to another embodiment, several of the aforementioned combinations i)- v2) are used to identify a volume or mass segment.

[0020] This creates redundancy, which can be used, for example, to check the quality of the segmentation by comparing the identification using the different methods.

[0021] Alternatively or additionally, in the event of a failure of one of the methods i)- v2), it can be automatically switched to another of these methods to ensure the tracking of the segment.

[0022] According to a further embodiment, at a first measuring point of the rolling mill, the strip is segmented into several mass or volume segments by integration, with the segment data being shifted through the rolling mill by an automation system, in particular by means of shift registers. This approach using an automation system can significantly reduce the number of required measured values ​​or measuring points. This embodiment can also be understood as independent of the aforementioned method for operating a rolling mill.

[0023] According to a further embodiment of the method, segmentation into mass or volume segments is performed by integration at several measuring points, and the measuring points following the first measuring point in the direction of belt travel are synchronized by the first measuring point. The synchronization can be passed on to the subsequent measuring points by means of shift registers. Synchronization or initial synchronization means, in particular, that a start signal or the start time for the beginning of the integration is given at a measuring point.

[0024] According to a further embodiment of the method, segmentation into mass or volume segments is carried out by integration at several measuring points, and corresponding measured or further operating parameters from one of the preceding or subsequent measuring points are used as operating parameters at one of the measuring points.

[0025] According to another embodiment of the method, initial synchronization at a measuring point is achieved by detecting (the position or presence of) the strip head and / or by detecting a portion of the strip following the strip head. Detection of the strip head is not necessarily required at every measuring point. Other parts of the strip that can also be used for synchronization include, for example, surface features of the rolled material or weld seams.

[0026] In a further embodiment of the invention, a strip head entry signal is acquired as a measured operating parameter. This signal can serve as a start signal for the integration of volume segments at the respective measuring point. Since the strip head entry signal is regularly acquired for safety reasons and for other functions of the rolling mill, it is particularly well suited for simplifying the identification of volume segments. When using the strip head entry signal, the method according to the invention segments with very high accuracy.

[0027] In another embodiment of the invention, the entry-side strip speed is incorporated into the identification process as a measured operating parameter. This is also a frequently recorded measurement variable that is also required for other functions of the rolling mill. For a particularly simple and sufficiently accurate identification of volume segments, it can be provided, for example, that only the strip head signals and a strip speed are used as measured variables for identifying the volume segments, whereby the preservation of strip mass is taken into account when identifying or calculating the volume segments at various measuring points along the rolling mill. The entry-side strip speed can be determined in one or more ways, e.g., by a laser beam, by a sensor on an entry-side deflection roller, and / or by measuring the unwinding process of a reel.When measuring the unwinding process of a reel, for example, the diameter and angular velocity of the reel can be continuously determined in order to calculate the infeed belt speed.

[0028] To further simplify a method according to the invention, it is provided that the bandwidth is measured only in front of the first rolling stand.

[0029] Alternatively, for further simplification, it may also be provided that the bandwidth is included in the identification of the volume segments as an unmeasured target value.

[0030] A reduction in the number of measuring points and sensors is advantageous, for example, if the strip thickness is measured at no more than three points. A first measuring point can be located before the first rolling stand, a second immediately after the first rolling stand, and a third after the last rolling stand. The location of the measuring points is not limited to the areas before or after a stand; one or more measuring points can be located on one or more stands. Overall, this ensures very precise identification of the volume segments without using an excessive number of measuring sensors.

[0031] The above-mentioned embodiments or methods can be combined in any way possible, so that variable optimization between high accuracy requirements and lower measurement effort can be achieved.

[0032] In a further development of the invention, it is provided that the identification of the volume segments takes place in a higher-level program unit responsible for setting the rolling mill. This can be done by assigning further measurement data to the volume segments.

[0033] Further advantages and features of the invention will become apparent from the exemplary embodiments described below and from the dependent claims. Brief description of the characters

[0034] The figures in the application relate to exemplary embodiments of the invention and are not to be understood as limiting. Further embodiments are disclosed in the subsequent detailed description of the exemplary embodiments. They show: Fig. 1 an exemplary scheme of a rolling mill for carrying out the method according to the invention; Fig. 2 an exemplary flowchart with possible combinations of an inventive volume segmentation; Fig. 3 a comparative analysis of errors between the method according to the invention and a method according to the prior art; Fig. 4 an exemplary output of a volume integrator; Fig. 5 an exemplary flow diagram of a volume segmentation according to an embodiment of the invention. Detailed description of the exemplary implementations

[0035] In one embodiment of the inventive method, the Fig. Figure 1 shows a rolling mill 1 with four rolling stands 2. Possible measuring equipment is also shown in the Fig. Figure 1 shows the following. Before the first rolling stand 2, the speed of the incoming strip 3 is measured by means of a speed measuring device 4, and the thickness of the incoming strip 3 is measured by means of a thickness measuring device 5, preferably continuously. The speed measurement is carried out, for example, by means of a deflection roller and / or non-contact with a laser speed measuring system. The thickness measurement can be carried out, for example, by absorption of X-rays. Other speed or thickness measuring devices 4, 5 can also be used.

[0036] In general, it is assumed that the conservation of mass flow of band 3 is valid, where the relationship M=∫A pv dt=const. applies, where A denotes the cross-sectional area of ​​the band, p the density of the band, v the speed of the band and M the mass of the band.

[0037] In other words, the following applies to each of the individual segments i at each measuring point: Mi=∫Ai pi vi dt=const.(i);i=0,…,n.

[0038] The mass of each segment i of strip 3 is assumed to be constant as it passes through the rolling mill 1. The masses M i However, different values ​​can be chosen for different segments i. Integration over time t continues until the constant or predetermined mass M is reached. i of the respective segment i. Subsequently, the integration of segment i+1 with its respective associated mass M can be performed. i+1 take place.

[0039] The density p can be assumed to be constant for the rolled material and all segments i. Therefore, the equation above can be transformed into an equation for volume conservation, such that: Vi=∫Ai vi dt=const.(i);i=0,…,n

[0040] This means that each volume segment V iby integrating over time over the product of its cross-sectional area A i and its speed v i can be determined.

[0041] In the case of a rolling mill 1 with strip-shaped rolled material 3, the strip width b (corresponding to a target value) can be considered constant. Neglecting the change in material density p, the above-mentioned basic relationship can be written concisely as follows: Vi=b∫di vi dt=const.(i);i=1,..,n

[0042] By integrating the measured thickness d multiplied by the target bandwidth b, which is considered constant, and the measured material velocity, the volume flow at a possible measuring point M is calculated. O , M1, M2, M3, M4...M n as an operating parameter. The integration is started, for example, when the tape head is detected at the respective measuring point.

[0043] The integrations mentioned above can be performed at any measuring point MO , M1, M2, M3, M4 ...M n The following steps are to be carried out. Which of the quantities cross-section A, thickness d, width b, velocity v, density p are used as measured values ​​or as target values ​​(specified operating parameters or operating parameters measured elsewhere) depends on the desired degree of accuracy of the process, any desired redundancy, or the technical equipment of the rolling mill 1.

[0044] The volume flow can be calculated by integrating the measured thickness d multiplied by the target bandwidth b, which is considered constant, and the measured material velocity at a first measuring point M. O These are determined as operating parameters. The integration is started, for example, when the tape head is at the first measuring point M. O is detected (see also Fig. 2).

[0045] Behind the first rolling stand 2, the strip speed is measured, for example, by means of a deflection roller and / or optically. One or more shift registers transport the respective segment boundary with the physical strip speed, for example, to measuring point M2. The integration at measuring point M2 is started when a value at measuring point M O The segment boundary formed at measuring point M2 is reached and / or the passage of the belt head is detected at measuring point M2. The bandwidth b (considered constant), the measured thickness behind the first stand 2, and the measured belt speed behind the first stand 2 are available as measured operating parameters for calculating the volume of segment i.

[0046] Behind the second rolling stand 2, in this example, there is no thickness measurement, but only a measurement of the strip speed, for example by means of a deflection roller.

[0047] When a segment boundary formed in M2 and / or the belt head is detected at measuring point M4, the integration starts in M4. To calculate the volume at this point, the bandwidth (considered constant), the measured thickness behind the first frame 2, and the belt velocity measured behind the first frame 2 are used.

[0048] As in Fig. As shown in Figure 2, the previously described embodiment can be extensively modified. For example, if no thickness measurement is available, the volume can also be calculated using the respective target thickness, or integration can be performed after the first measuring point M. OThe system dispenses with strip thickness measurement and shifts the segment boundary to the next measuring point using only a shift register when strip speed measurement is available. If neither strip thickness nor strip speed measurement is available at a particular measuring point or is to be used for identification, an existing value pair (material thickness and material speed) from another measuring point can be used, as mass continuity in the rolling mill is ensured. For example, only strip head detection is required to start the integration process. The choice of segmentation method can be dynamically adjusted based on the condition and availability of the measuring instruments.

[0049] Each band segmentation method provides a counter value Z for the currently measured band segment and a signal for the associated measuring point, e.g., M. O, M2, M4. The volume segment size can be changed during ongoing rolling operations. An adjustment of the segment volume can be made immediately after a segment boundary. The count value of the first segment with the new segmentation size, volume segment V', is sent to all other measuring points.

[0050] In Fig. Figure 3 presents a comparison between segmentation according to an embodiment of the inventive method (volume segmentation) and the time-controlled method, as described above in the prior art. Various measuring points M are shown. O Up to M5, the correct physical segmentation (Vol) is counted up in the upper part, and the segmentation corresponding to a constant time base (Iso) is shown below.

[0051] This shows that when speeds change, the time-based segmentation no longer corresponds to the physically correct segmentation. For example, the band position of segment 11 shifts at the different measuring points from the time-based segment 8 at the first measuring point M. O into segment 5 at measuring point M5.

[0052] Simulation revealed that the segmentation exhibits discretization errors of varying sizes depending on the method used in the present invention. Depending on the combination, this error can, for example, be on the order of the basic cycle time of the automation system and, in this case, is the same for all measuring points.

[0053] An integrator is used to calculate volume segmentation. Using one of the preceding equations, it determines the segment boundaries for a given volume size. Once the desired segment size is reached, the integrator is reset. The output of such a function block might, for example, look like this: Fig. The curve shown in Figure 4 follows. Once the target volume (in the case shown: 3 segment volume units) is reached, a rising edge at the integrator output triggers an incremental counting signal Z.

[0054] Volume segmentation can be performed particularly at a first measuring point or measuring position M OThe input values ​​for segmentation would be the material velocity, the cross-sectional area, the material density, and, in particular, the volume segment size to be divided, which can be variably specified. The material velocity can be determined in one or more ways, as described above. Target values ​​can also be used for all measured operating parameters.

[0055] Volume segmentation can be performed behind the first measuring point M OFor example, the process can be functionally identical to that at the first measuring position. Here too, measured operating parameters can be replaced by target values. Provided mass or volume is conserved (assuming a constant density), the measured operating parameters from other measuring points can also be used as predefined operating parameters. The counting can be synchronized by shifting the segment boundaries as soon as the required operating parameters are met, or by detecting the rolled material at the measuring point. The target segment volume or mass, along with the corresponding segment count Z, is determined, for example, from the first measuring position M. O or supplied from another previous measurement position.

[0056] The output of the volume segmentation at the first measuring point can be passed on to a cascade or series of displacement registers between the subsequent measuring points. The measured operating parameter can be the material velocity.

[0057] Segmentation depends on the operating parameters required for segmentation. If individual required operating parameters are invalid, for example due to faulty or failed measurement signals, then segmentation at the corresponding measuring point can either be carried out using a different method or the relevant operating parameters can be replaced by the corresponding target values.

[0058] Multiple segmentation methods can be used simultaneously, resulting in redundancy. This redundancy will be discussed in more detail below.

[0059] If segmentation over constant masses or volumes is performed at all measuring points using integration, this method exhibits the smallest discretization error (Method B). However, it requires additional measured and / or predefined operating parameters. To achieve precise initial synchronization, integration over mass or volume segments is performed at the first measuring point (Method B), whereby this segmentation is shifted through the rolling mill via shift registers (Method A). If the segmentation performed (Method B) fails at one or more measuring points after initial synchronization, the method of integration over mass or volume segments at the first measuring point and shifting through the rolling mill via shift registers (Method A) can be automatically reverted to, so that Method A represents a replacement function.Once the required operating parameters are available again, the system switches back to method B, in which integration is performed at each measuring point. The new meter reading is synchronized via the corresponding value from the shift register. If a required measurement fails, setpoint values ​​can be used.

[0060] To further validate the validity of a measuring point, the deviation between the individual methods can be used.

[0061] Various measures can be taken for synchronization. For example, initial synchronization can be achieved using the tape head entry signal. This detection can be accomplished, for instance, using force sensors, optical sensors, or other detection methods. The position of the tape head can be determined over time. This can be done at one or more measuring points.

[0062] After determining the strip head position at a measuring point, the automation system can calculate the position of the strip head. For all methods, the integration of additional synchronization measuring points increases the positional accuracy of the rolled material.

[0063] Alternatively, initial synchronization takes place behind the tape head. For this purpose, intermediate setup speeds are preferably available as measured and / or predefined operating parameters.

[0064] Preferably, as described above, the identification of the volume segments takes place in a higher-level program unit responsible for setting the rolling mill. This can be done by assigning further measurement data to the mass or volume segments. To optimize automation tasks, the identified volume segmentation can also be transferred to the higher-level program unit responsible for setting the rolling mill.

[0065] The higher-level program unit responsible for setting the rolling mill can be designed to be adaptively learning.

[0066] Within the higher-level program unit, the additional operating parameters that occurred during the rolling process can be assigned to the respective identified volume segment of the strip in order to enable, for example, optimization and / or improved error control of the rolling mill. These additional operating parameters can be various material properties such as flatness, tensile stress distribution, lead (differential speed) during rolling, etc.

[0067] According to one embodiment of the method according to the invention, a rolling mill with several rolling stands is provided, wherein a reeling unit is arranged on the inlet side and a coiling unit on the outlet side (not shown).

[0068] Between the uncoiler and the first rolling stand, the incoming strip is guided, according to this embodiment, over a first deflecting roller, the rotational speed of which is preferably measured continuously by a pulse generator. From this, the actual strip speed on the incoming side at a first measuring point M is derived, preferably directly. O as a first measured operating parameter.

[0069] Furthermore, a device is located in front of or on the first stand that detects the entry of a strip head at the beginning of the rolling process. This measurement is called the MIS (Measurement Information System). O is a Boolean measurement quantity of a first measuring point M O and represents a second measured operating parameter of the rolling mill.

[0070] Furthermore, according to the exemplary embodiment, there are additional means for detecting the passing strip head in the further course of the rolling mill, which are designated as additional measuring points M1, M2,..., M n boolean values ​​MIS M1 , MISM2 , ..., MIS Mn to generate for the passage of the tape head.

[0071] At each of the measuring points M O , M1, M2... the passage of the tape head causes an initial synchronization, which serves as a start signal for an integration process.

[0072] As in Fig. As shown in Figure 5 of this embodiment, the time integration begins with the product of a target strip thickness and a target strip width as reference values ​​or unmeasured parameters and the strip speed measured at M0. The volume integrated over time controls a volume segment counter as soon as it reaches a predetermined size, after which the integration of the next volume segment begins. Fig. This is represented by the sawtooth curves in the volume-time diagrams. The time axes of the three diagrams shown one below the other are identical, i.e., they all start at the same time.

[0073] The incoming belt speed M0 is known at each measuring point, and thus which volume segment passes through which measuring point at what time.

[0074] It is important to emphasize that the deviations are limited to the same segment and are propagated through the system along with that segment. This allows for a sufficiently precise assignment of further operating parameters to a respective volume segment. Such further operating parameters could include, for example, local strip tension distribution or measured values ​​for strip flatness. The volume segments are preferably recorded by a higher-level program unit responsible for setting the rolling mill and linked to the other measured and / or additional operating parameters.

[0075] The features of the described embodiments can be combined with each other or exchanged for one another. Reference symbol list 1 rolling mill 2 Rolling mill Volume 3 4 Speed ​​measuring device 5 Thickness gauge M O Measuring point M1 measuring point M2 measuring point M3 measuring point M4 measuring point M n Measuring point MIS tape head entry signal Volume t time Z Counter value of the segments

Claims

Method for operating a rolling mill (1), comprising the steps: a) recording at least one operating parameter as a measured actual value; and b) identifying at least one volume or mass segment of a passing rolled stock (3) using the measured operating parameter and further operating parameters by integration; wherein at a given measuring point (MO, M1, M2, M3, M4, ..., Mn) at least one of the operating parameters is taken from the group rolled stock thickness, rolled stock width, rolled stock speed, rolled stock density and cross-sectional area of ​​the rolled stock (3) and is included in the identification as an unmeasured target value, characterized in that after a segment has passed through at least one rolling stand (2) of the rolling mill (1) and the segment has been tracked by means of a measuring point (MO, M1, M2, M3, M4, ...) downstream of the stand (2) in the direction of travel of the rolled stock,, Mn) the effect of the rolling stand (2) on the segment is determined, and this determined effect of the rolling stand (2) is taken into account for a subsequent rolled material segment or a subsequently rolled material. The method according to claim 1, wherein the at least one volume or mass segment of a continuous rolled stock (3) is detected and integrated at at least one of the measuring points (MO, M1, M2, M3, M4, ..., Mn) by at least one of the following combinations of operating parameters i) to v2): i) Measured cross-sectional area of ​​the rolled stock (3), measured rolling stock velocity; ii) Target value for the cross-sectional area of ​​the rolled stock (3), measured rolling stock velocity; iii) Target value for the cross-sectional area of ​​the rolled stock (3), target value rolling stock velocity; iv1) Target value rolled stock width, measured rolled stock thickness, measured rolling stock velocity; iv2) Target value rolled stock width, measured rolled stock thickness, target value rolling stock velocity; v1) Target value rolled stock thickness, measured rolled stock width, measured rolling stock velocity. v2) Target value rolled stock thickness, measured rolled stock width, target value rolling stock velocity. Method according to claim 2, wherein several of the combinations of i) to v2) are used to identify the volume segment, and / or the quality of the segmentation is monitored by comparing the identification by different combinations i) to v2). Method according to claim 2 or 3, wherein, in the event of failure of one of the combinations i) to v2), the system automatically switches to another of these combinations to ensure the tracking of the segment. Method according to one of the preceding claims, wherein at a first measuring point (MO) the rolled material (3) is segmented into several mass or volume segments by integration and the segment data are shifted through the rolling mill (1) by an automation system, in particular by means of shift registers. Method according to claim 5, wherein segmentation into mass or volume segments is carried out by integration at several measuring points (MO, M1, M2, M3, M4, ..., Mn) and the segments formed in the first measuring point (MO) are first synchronized in the direction of rolling of the material at subsequent measuring points (MO, M1, M2, M3, M4, ..., Mn) by the first measuring point (MO). Method according to claim 5, wherein segmentation into mass or volume segments is carried out by integration at several measuring points (MO, M1, M2, M3, M4, ..., Mn) and operating parameters corresponding to one of the preceding or subsequent measuring points (MO, M1, M2, M3, M4, ..., Mn) are used as measured and / or further operating parameters of one of the measuring points (MO, M1, M2, M3, M4, ..., Mn). Method according to claim 5, wherein segmentation into mass or volume segments is carried out by integration at several measuring points (MO, M1, M2, M3, M4, ..., Mn) and setpoint values ​​of operating parameters are used as measured and / or further operating parameters at at least one of the measuring points (MO, M1, M2, M3, M4, ..., Mn). Method according to claim 5, which additionally comprises the steps of at least two of claims 6 to 8 for forming a redundancy of the segmentation of the mass or volume segments. Method according to one of the preceding claims, wherein initial synchronization at a measuring point (MO, M1, M2, M3, M4, ..., Mn) is carried out by detecting the roll head entry signal and / or by detecting a part of the roll (3) following the roll head. Method according to one of the preceding claims, characterized by the step: capturing a rolling stock head entry signal (MISMO, MISM1, MISM2,...,MISMn) as a measured operating parameter, in particular as a start signal for the integration of the mass or volume segments. Method according to one of the preceding claims, characterized in that an inlet-side rolling material velocity is included in the identification as a measured operating parameter. Method according to claim 12, characterized in that the rolling material speed is measured by measuring the unwinding process of a reel. Method according to claim 1 or 2 wherein the rolled material width is measured only in front of a first rolling stand (2) of the rolling plant (1) or the rolled material width is included in the identification only as an unmeasured target value. Method according to claim 1 or 2, characterized in that the rolled material thickness is measured at no more than three measuring points, in particular before a first rolling stand (2), immediately after the first rolling stand (2) and after a last rolling stand (2), wherein several rolling stands (2) are provided. Method according to one of the preceding claims, characterized by the step: identifying the mass or volume segments in a higher-level program unit responsible for setting the rolling mill (1), in particular by assigning measured and / or other operating parameters to the mass or volume segments.

Images