DE102018111627A1 - Stretch-bending straightening system and method for its operation - Google Patents

Abstract

In a stretch-bending straightening machine and a method of operating the same, belt-shaped material is fed to a pull-up area (50) and pull-down area (52) with the pull-down area (52) downstream of the pull-up area (50), a bending-straightening unit is located in the hoist area (50). A measuring system determines first measured values in the high-tension range (50). A controller (C) is determined and suitable for determining a deviation of the first measured values from a target value of the bending straightening result and for determining at least one manipulated variable for the bending straightening aggregate as a function of the determined deviation within a first closed loop. By additionally providing at least one measuring system for determining second measured values in the low-pull range, a controller (C) for determining a deviation of the second measured values from the setpoint value of the bending-direction result and for determining the at least one manipulated variable as a function of the determined deviation is determined and suitable within a second closed loop, and in that selection means are provided which are intended and suitable for selecting the first or the second closed loop for reducing the deviation of the first and / or second measured values from the predetermined or predefinable setpoint , a stretch-bending straightening system and a method of actuating it are designed to increase the quality of the strips processed therewith.

Description

Field of the invention

The invention relates to a stretch-bending straightening system according to the preamble of claim 1 and a method for the actuation thereof according to the preamble of claim 10.

State of the art

Stretch-bending straightening machines, such as those in 3 schematically illustrated plant, are systems that are used to minimize iron stress in iron and non-ferrous metal bands and thereby achieve a better flatness. Metallic bands are understood to mean any band-shaped materials. The term "metallic" includes metals per se as well as their alloys. Since the bands after the previous rolling process have unevenness, the straightening process is performed. These imprecisions are caused by fibers of different lengths in the material and are shown by wavy deformations in the band. This is for explanation in the 4a . 4b such as 5a to 5d shown. Has the band-shaped material 10 according to 4a waves 12 , are different fiber lengths according to 4b responsible. With regard to the reference fiber length L ref the adjacent fibers have a different difference length .DELTA.L on. These wavy deformations can occur in the band-shaped material 10 as medium waves 13 according to 5a , as edge waves 14 according to 5b , as one-sided edge waves according to 5c or as a combination of edge waves 14 and medium waves 13 represent.

For the refining process, the in 3 shown stretch-bending straightening system of a arranged on a spool coil in the running direction 24 fed, band-shaped material 10 using a brake S block 16 and a train S block 18 produces a Hochzugbereich in which the band-shaped material 10 is stretched. (The designation "S" is used to make it clear that the belt is guided in an S-shape around rollers in these areas.) The occurring tension is transmitted via a measuring device 22 measured. In addition, the belt is in the bending-straightening aggregate 26 Subjected to alternating bends. Through these two measures, the shorter fibers are adjusted to the longer ones and reduced internal stresses. The so-directed band-shaped material is then on a recoiler 28 wound up again.

To the alternating bending in the bending-straightening aggregate 26 to generate, according to 6 . 7a . 7b precise straightening rolls 30 used from the top and bottom over the entire bandwidth. These straightening rollers 30 To avoid sagging, use shorter support rollers 32 supported. Because unevenness in the band-shaped material 10 occur partially, for example, in the edge region, are the supports of the lower straightening rollers 30 adjustable. This makes it possible, the straightening rollers 30 adjust a bending contour to produce a targeted stretching of the shorter fibers. For double-sided edge waves 14 For example, the inner supports are raised to stretch the shorter fibers in the center of the belt.

In addition, according to the state of the art, an unevenness measuring system (UMS), which can be obtained from Ungerer Technology GmbH, can be used for the straightening process 8th be used. This unevenness measuring system has been specially designed to measure the unevenness of tapes with relatively low specific tape counts. It determines the unevenness over the entire bandwidth of the product after the train S block 18 and is capable of supporting the individual supports of the bending / straightening aggregate 26 adjusted so that an optimal directional result is achieved. To detect the unevenness, the UMS uses sensitive force sensors, which are mounted on a fixed axle. Preferably, for a measuring role 36 used. About juxtaposed segments are different forces from the tape or band-shaped material 10 , which are caused by the unevenness, transmitted directly to the sensors. For each segment preferably two force sensors are used. These measured values are taken from an evaluation unit 34 processed and sent to the controller C passed. The controller C calculates the optimal parameters for the straightening process and thus regulates via a programmable logic controller SPS by means of a position control 38 the adjustment of the supports, so the support rollers 32 , The UMS is right after the train S block 18 in Niederzugbereich arranged as close to the straightening process to the Totstrecke 42 keep as low as possible. The dead-end is the distance that the material needs to go from the bending-straightening aggregate 26 to the measuring roller 36 to arrive before an imprecision can be determined on the measuring roller, which then starts a control process in a closed loop.

From the DE 10 2004 043 150 A1 is an in 9 illustrated measuring system known, which is used in the Hochzugbereich. Here is one after the bending straightening unit 26 arranged roller of the train S-block 18 - by a measuring roller 40 replaced. This roller consists of a massive body. The sensors are used on the circumference of the solid roller body and the entire running surface of the measuring roller 40 coated with a PU coating. The sensors are able to detect the smallest force differences in the belt. Subsequently, the determined force values become an evaluation as evaluation 34 transmitted there, processed accordingly and to a controller C for calculating optimal parameters for the straightening process in a closed loop. The advantage is a significantly shorter dead-end compared to the above-mentioned UMS system 42 ,

Presentation of the invention

Based on this prior art, the present invention has the object, a stretch-bending straightening system and a method for their operation in such a way that the quality of the processed tapes is increased.

This is achieved with a stretch-bending straightening system with the features of claim 1 and by a method for their actuation with the features of claim 10. Advantageous developments are the subject of the dependent claims. The features listed individually in the claims can be combined in a technologically meaningful manner and can be supplemented by explanatory facts from the description and by details from the figures, with further embodiments of the invention are shown.

For this purpose, the stretch-bending straightening system has a feed means for feeding a strip-shaped material into a pull-up region and a pull-down region, wherein the pull-down region is arranged downstream of the pull-up region in the direction of the strip-shaped material. In Hochzugbereich a bending-straightening unit is arranged. In addition, a measuring system for determining first measured values in the high-tension area and a measuring system for determining second measured values in the low-pull area are provided. A controller is provided for determining the deviation of the first measured values from a predefined or predefinable setpoint values of the bending straightening result, and a controller for determining the deviation of the second measured values from this setpoint value. Control variables are determined by the controller (s) in order to minimize the deviations within closed control loops. In other words, at least two measuring systems, once in a high-tension area and once in a low-pull area, are provided in order to optimize the quality of the material to be processed as needed. Via selection means it can be decided whether the first or the second closed loop is used for the optimization. Such a selection can be made according to certain criteria, which are based either on empirical values or material parameters, but can also be formed anew during the process, since measurements are carried out simultaneously in the respective closed loop in the pull-up area and in the pull-down area, so that based on the characteristics thus determined an optimization can be selected. This makes it easy and cheap way to produce a high quality tape.

It should be considered that a measuring device for the high-tension area has hitherto generally been used only in rolling mills, whereas the solutions known from the prior art detect measured values and in particular plane unevenness in the low-pull area on the material outside of rolling mills, which is determined by the bending in the high-tension area. Straightening unit was already coming from the coil. However, only the combination of the two measuring devices allows optimal influence depending on the conditions of the band, the requirements of the material to be manufactured and / or the material properties.

Preferably, a single controller is provided for the simultaneous determination of the deviation of the first and the second measured values from the desired value, so that the selection means alternatively selects the first or the second control loop. As a result, in the controller without further synchronization between different controllers and controls, an optimization can already be carried out with minor deviations to the effect that switching from one to the other control loop takes place.

An evaluation unit is advantageously provided for evaluating the first and / or the second measured values, that is, more than one evaluation unit may be provided. The selection means are thereby enabled to select the first or the second closed loop as a function of the evaluation. Both manual and semi-automatic or automatic selection may be considered as selection means, depending on which specifications are given to the controller and the evaluation unit.

Furthermore, it is advantageous if display means are provided for displaying the first and second measured values and / or the selection means are provided for manual selection by an operator. An operator is thus enabled to see at a glance, on the basis of the display, where the measured values of the two measuring devices are currently moving and thus to decide whether he prefers the first or the second control loop.

The measuring system in the Hochzugbereich is preferably formed by an arranged after the bending-straightening unit measuring roller. It is particularly advantageous if a roller of a train-S block, which is usually arranged after the bending-straightening unit, by a Measuring roller is replaced at the periphery of sensors are used and their tread is coated with an elastic coating. As a result, it can be determined almost immediately after the bending-straightening aggregate whether a qualitatively good result is established in the pull-up region, so that the dead-total distance between the bending-straightening aggregate and the measuring system is shortened. If the measuring roller is formed in a preferred embodiment as part of the train S block, no separate measuring system or separate storage for such a roller is required, instead the already present in the train S block roller can be replaced by the measuring device, which the cost of the entire structure further reduced.

The measuring system for determining the second measured values in the pull-down region is advantageously to be arranged after the train S block, wherein it is arranged as close as possible to this block. Such an arrangement helps to reduce the Totstrecke and thereby the reject for this measurement system.

It is particularly preferred if the measuring roller used for this purpose has juxtaposed measuring segments with at least one sensor, preferably with two force sensors, since it is important to detect the differences over the bandwidth as precisely as possible over the entire area, especially in the low-pull area. While some deformations are not perceptible in the high-tension area due to the forces occurring there, they increasingly occur again under lower tensile forces in the pull-down area after elastic recovery and can thus be clearly recognized there. For this purpose, a finer resolution of advantage, which can be achieved by the arrangement of the measuring segments.

It is advantageous if, in addition, storage means are provided for storing operating parameters in order to use once established operating parameters for future processes. In this respect, these operating parameters are stored in a database in which the operating parameters are stored together with data about the processed material. In this way, a database and possibly also supplemented by expert knowledge a record can be stored, which can be used with comparable materials from the outset to work with the best possible approximation from the start on the system. As a result, the result can be optimized faster and the rejection can be reduced.

According to the method, the band-shaped material is fed to the Hochzug- and Niederzugbereich. First and second measured values are determined in the high-voltage range as well as in the low-voltage range, and a deviation from a nominal value is determined. Due to this deviation, a manipulated variable for the bending-straightening aggregate is calculated for both measuring systems, which can contribute to an optimization of the result. On the basis of predetermined or predefinable criteria such as a deviation from the nominal value but also empirical values or material characteristics, it is then selected whether the first or second closed-loop control is used to achieve the desired result. Thus, both the advantages of a measurement in the high-voltage range and the advantages of a measurement in the low-voltage range can be considered simultaneously, so that it can be decided at any time in which control circuits a better result can be achieved. The system can then be switched manually, semi-automatically or automatically, depending on the information available and the equipment of the device to the respective control loop in order to achieve an optimal result.

The determination of the deviation of the first and second measured values by means of a single controller preferably takes place simultaneously for both measuring systems, so that alternatively the first or second closed control loop is selected. In accordance with the method, all the information is present at the same time in order to make an informed decision.

The first and second measured values are favorably evaluated with regard to the achievement of a good result according to predetermined criteria, wherein the corresponding control loop is selected depending on the evaluation. Such criteria may initially be specific requirements for the quality to be achieved of the strip to be processed, but it may also be material characteristics or empirical values that are predetermined by the operator or can be taken from expert knowledge that may be stored in a database.

For a manual selection, the first and second measured values are advantageously displayed to an operator at the same time, so that the latter has the optimum control loop for the result to be achieved via selection means 48 can choose. This allows the operator to decide at a glance what is currently the optimal solution. Since this can change over the course of time even with a coil, this process can also be automated and monitored so that, if necessary, an indication of a suitable switching time can be given to the operator.

Since the material to be processed in the direction first passes through the Hochzugbereich and then the Niederzugbereich, it is particularly of Advantage, when the method is first operated on the basis of the first measured values from the Hochzugbereich in a first closed loop until the directed band-shaped material reaches the measuring roller in Niederzugbereich, so then can be switched to the second closed loop in Niederzugbereich. Whether or not such switching is required at this moment can be determined from the measured values obtained. By such a configuration, the dead distance can be further reduced.

It is particularly advantageous if operating parameters already determined on the stretch-bending straightening system are stored together with data about the material to be processed in a database and can be reused at a later time for processing comparable materials. This reduces set-up time and set-up time and optimizes the process so that a good result can be achieved quickly. Optionally, expert knowledge can be superimposed on the knowledge available in the database, which contains knowledge of certain material properties and associated operating parameters for the stretch-bending straightening system.

Both the stretch-bending straightener and the method may be operated with a program that is set up and / or programmed with program code to achieve the desired results and advantages when the program code is directed to a computer, a processor, or a programmable controller Hardware component is executed.

Further advantages will become apparent from the subclaims and from the following description of a preferred embodiment.

list of figures

• 1 eine schematische Darstellung der erfindungsgemäßen Anordnung der Komponenten der Erfindung,
• 2 einen schematischen Ablauf des erfindungsgemäßen Verfahrens,
• 3 einen schematischen Aufbau einer Streck-Biege-Richtanlage nach dem Stand der Technik,
• 4a, 4b eine dreidimensionale Darstellung von Randwellen und zugehörigen Faserlängen an einem zu verarbeitenden Material,
• 5a bis 5d Darstellungen von Mittelwellen, Randwellen, einseitige Randwellen sowie einer Kombination von Rand- und Mittelwellen an einem zu verarbeitenden Material,
• 6 eine schematische Darstellung eines Richtprozess nach dem Stand der Technik,
• 7a, 7b eine stirnseitige Ansicht sowie eine Seitenansicht von Richtwalzen und Stützrollen bei einem Richtprozess gemäß 6,
• 8 eine schematische Darstellung eines Unplanheit-Mess-Systems für den Niederzugbereich nach dem Stand der Technik,
• 9 eine schematische Darstellung eines Planheits-Mess-Systems nach der DE 10 2004 043 150 A1 .

The invention will be explained in more detail below with reference to an embodiment of the invention shown in the figures. Show it:

• 1 a schematic representation of the inventive arrangement of the components of the invention,
• 2 a schematic sequence of the method according to the invention,
• 3 a schematic structure of a stretch-bending straightening system according to the prior art,
• 4a . 4b a three-dimensional representation of edge waves and associated fiber lengths on a material to be processed,
• 5a to 5d Representations of center waves, edge waves, one-sided edge waves and a combination of edge and center waves on a material to be processed,
• 6 a schematic representation of a straightening process according to the prior art,
• 7a . 7b an end view and a side view of straightening rollers and support rollers in a straightening process according to 6 .
• 8th a schematic representation of an unplanarity measuring system for the Niederzugbereich according to the prior art,
• 9 a schematic representation of a flatness measuring system according to the DE 10 2004 043 150 A1 ,

Description of preferred embodiments

Before describing the invention in detail, it should be noted that it is not limited to the respective components of the device and the respective method steps, since these components and methods may vary. The terms used herein are intended only to describe particular embodiments and are not intended to be limiting. In addition, if singular or indefinite articles are used in the specification or claims, this also applies to the majority of these elements unless the overall context clearly makes otherwise clear.

According to the invention, for the first time both measuring systems for the high and low tension areas are combined. This system is preferably characterized by the use of a single controller C In principle, several controllers can be used. This preferably a controller C is capable of measuring the flatness of the measuring roller 40 in the hoist area 50 and the measuring roller 36 in the Niederzugbereich 52 evaluate. Based on these values, the supports of the leveler are adjusted.

The evaluation units 34 The two measurement units are connected to the controller. This picks up the flatness values of the two units and uses the measured values of the active measuring unit to calculate the optimum parameters for the straightening process. The plant operator preferably determines according to which of the two measuring units the straightening process is to be regulated. He is therefore able, depending on the requirements and material, to use the more suitable measuring unit and can also change it during a process. In order to be able to compare the two units with each other for the respective process, it is possible to visualize the flatness measured values. The measured values of the measuring roller become 36 in the Niederzugbereich 52 and the measuring roller 40 in the hoist area 50 graphically and / or as numerical values, preferably simultaneously on a display unit 46 shown.

Thus, the system according to the invention achieves a more precise adaptation of the supports to the unevenness of the belt. It also makes it possible, depending on the material requirement, alloy and / or thickness, to use the more suitable system and thus to achieve optimum leveling results.

For very thin and soft materials such as aluminum, it could happen that uneven surfaces can not be detected clearly due to the high pull. This can be caused by the elastic properties of the bands. If the tape is stretched with the high draw so that it appears flat, unevenness could not be measurable at this moment and after a reduction of the pull by the elastic reversion again occur. In this case it would be possible to change the measuring system during the process and thus to improve the process.

Another advantage is that rejects on materials that have better straightening results with the measuring roller 36 in the Niederzugbereich 52 be achieved, can be permanently reduced. For this purpose, first the measuring roller 40 in the hoist area 50 activated and after the dead distance to the measuring roller 36 in the Niederzugbereich 52 switched.

The measuring roller 40 in the hoist area 50 however, it is suitable for high-strength materials, for example. Since the band is much firmer, the blanks are not distorted by the high train. Therefore, in this case, permanently the measuring roller 40 in the hoist area 50 used and thus the advantage of the much shorter dead zone be exploited.

After the band-shaped material 10 the system can be started. At first the controller works C with the values of the high tensile measuring roller 40 because their dead-end is significantly lower. Dead-end is understood to mean the length of material that, as a result of the controlled system, is controlled by an adjusting device, the bending-straightening aggregate 26 , is required to the measuring point before a detected unevenness by a controller intervention on the bending-straightening aggregate 26 leads to an influence on the detected unevenness. The controller C represents the bending-straightening aggregate 26 in accordance with the calculated parameters to achieve the optimal straightening result. After the straightened band the pull-down measuring roller 36 has reached, the controller turns off C independently from the high tension measuring roller 40 to the pull-down measuring roller 36 and regulates the support rollers 32 of the bending-straightening aggregate with the measured values of the pull-down measuring roller 36 unless otherwise adjusted by the operator via the input means 49 or by the stretch-bending straightening system, for example, due to the machine already known earlier results is given.

The plant operator can manually at any time via input means 49 intervene and the controller C change arbitrarily. About the input means 49 It can also enter and specify process data. Furthermore, the plant operator can create a database 44 For example, parameters for the process can be saved for predefined materials or materials that have already been assigned to the plant. This allows the controller C in the case of repetitive orders, the optimal measuring roller is the one hand 36 or measuring roller 40 choose.

In the database 44 In addition to the data about processes already carried out on the system, further data can also be stored, such as an assignment of certain operating parameters to specific materials or even expert knowledge. Expertise is information about how an experienced operator would operate the stretch-bend leveler and what parameters he would use to achieve a good result. Here also other physical properties can be incorporated, such as the operating speed or temperature-dependent properties.

Because both the measuring roller 40 in the hoist area 50 as well as the measuring roll 36 in the Niederzugbereich 52 are engaged and display their measured values, it is possible to interpolate the measured values of the two measuring devices and have them compared with each other by the software. This is made possible by, for example, forming an average value per measuring device and this with defined limits at an interval of eg. 50 Control cycles determined. Depending on the result and evaluation of the software, the controller may C then independently decide which measuring system is more suitable. This changeover can be automatic or a recommendation can be made to the plant operator.

2 schematically shows a procedure. In step 100 becomes band-shaped material 10 a pull-up area 50 and a down area 52 fed. The material thus supplied is in the step 101 Measured by means of a measuring device in the Hochzugsbereich, wherein flatness deviations are determined as the first measured values. After the pull-up area, the band-shaped material enters the pull-down area 52 and there in the step 102 also measuring the flatness deviations. This leads to the second measured values.

In step 103 a comparison of the flatness deviations with a setpoint for the flatness deviations takes place. If the flatness deviation is less than or equal to the nominal value, the stretch-bending straightening system is operated with these operating parameters. If the setpoint is not maintained, in step 104 Preferably selected on the basis of predetermined criteria, whether the controlled system in the high-tension area or in the low-pull area influence on the result and thus on the flatness deviation is taken. Depending on which route is selected, either in step 105 or in the step 106 the manipulated variable for the hoist area 50 or the Niederzugbereich 52 calculated. The manipulated variable is then in step 107 on the bending-straightening unit 26 then the procedure jumps back to step 101 and 102 to the flatness deviations in the Hochzugbereich 50 or in the Niederzugbereich 52 to eat. The procedure then starts again.

For the selection of the controlled system in step 104 and the determination of the manipulated variable in the steps 105 and 106 Also, information can be applied from a database 44 into which operating parameters from previous processes, material characteristics or even expert knowledge have found their way into.

LIST OF REFERENCE NUMBERS

10

band-shaped material

12

wave

13

medium wave

14

edge wave

16

Brake-S block

18

Train-S block

20

uncoiler

22

measuring device

24

direction

26

Bending-straightening unit

28

recoiler

30

straightening roll

32

supporting role

34

evaluation

36

measuring roller

36a

measurement segment

38

position control

40

Measuring roller in the high-tension area

42

Totstrecke

44

Database

46

display unit

48

selection means

49

input unit

50

Hochzugbereich

52

Niederzugbereich

L ref

reference length

.DELTA.L

length difference

C

controller

SPS

Programmed logic controller

100 to 108

steps

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been 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.

Cited patent literature

• DE 102004043150 A1 [0006, 0026]

Claims (16)

Stretch-bending-straightening system with - a feed means for feeding a strip-shaped material (10) along a running direction (24) in a Hochzugbereich (50) and a Niederzugbereich (52), wherein the Niederzugbereich (52) in the running direction (24) the Hochzugbereich ( 50) is arranged downstream, - a bending-straightening unit (26), which is arranged in the high-tension area (50), - at least one measuring system for determining first measured values in the high-tension area (50), - a controller (C), for the determination a deviation of the first measured values from a predetermined or predefinable setpoint value of the bending straightening result and for determining at least one manipulated variable for the bending straightening aggregate (26) as a function of the determined deviation is determined within a first closed loop and is suitable - an adjusting means for Influencing the manipulated variable, characterized in that in addition at least one measuring system for determining second measured values in the Niederzugbe is provided rich that a controller (C) for determining a deviation of the second measured values of the predetermined or predeterminable setpoint of the bending straightening result and for determining the at least one manipulated variable as a function of the determined deviation within a second closed loop is determined and suitable that Selection means (48) are provided which are intended and suitable for selecting the first or the second closed-loop control circuit for reducing the deviation of the first and / or second measured values from the predetermined or predefinable desired value. Stretch-bending straightening system after Claim 1 , characterized in that the controller is a single controller (C) which is determined and suitable for the simultaneous determination of the deviation of the first and the second measured values from the predetermined or predetermined desired value, and that the selection means (48) are intended and suitable for this purpose Alternatively, select the first or the second closed loop. Stretch-bending straightening system after Claim 1 or 2 , characterized in that at least one evaluation unit (34) is provided for evaluating the first and the second measured values, and that the selection means (48) are intended and suitable for selecting the first or the second closed control loop as a function of the evaluation. Yield-bending straightening system according to one of the preceding claims, characterized in that display means (46) are provided for displaying the first and the second measured values and / or that the selection means (48) are provided for manual selection by an operator. Yield-bending straightening system according to one of the preceding claims, characterized in that the at least one measuring system for determining the first measured values in the high-tensile region (50) is formed by a measuring roll (40) arranged after the bending-straightening aggregate (26). Stretch-bending straightening system after Claim 5 , characterized in that a roller of a train S block (18) is replaced by the measuring roller (40), at the periphery of which sensors are inserted and whose running surface is coated with an elastic coating. Yield-bending straightening system according to one of the preceding claims, characterized in that the at least one measuring system for determining the second measured values by one after the bending straightening aggregate (26) and after the train S block (18) in the low-pull area ( 52) arranged measuring roller (36) is formed Stretch-bending straightening system after Claim 7 , characterized in that the measuring roller (36) juxtaposed measuring segments (36a) with at least one sensor, preferably with two force sensors comprises. Yield-bending straightening system according to one of the preceding claims, characterized in that storage means are provided for storing the operating parameters set as a result of the first or second closed-loop control, and that a database (44) is provided which is intended and suitable for sharing these operating parameters with data about the material processed with these operating parameters. Method for operating a stretch-bending straightener according to one of the preceding claims, comprising the steps of: - feeding a strip-like material (10) along a running direction (24) into a pull-up region (50) and a pull-down region (52), wherein a bend -Stream unit (26) is arranged in the high-tension area (50) and wherein the pull-down area (52) is arranged downstream of the pull-up area (50) in the direction of travel (24) determining first measured values in the pull-up area (50), determining a deviation of the first Measured values of a predetermined or predefinable setpoint value of the bending straightening result, determining at least one manipulated variable for the bending straightening aggregate (26) as a function of determined deviation within a closed loop, characterized by - determining second measured values in the low-pull range (52), - determining a deviation of the second measured values from the predetermined or predefinable setpoint value of the bending-straightening result. - Determining the at least one manipulated variable as a function of the determined deviation within a second closed loop, - Selecting the first or the second closed loop to reduce the deviation of the first and / or second measured values of the predetermined or specifiable setpoint. Method according to Claim 10 , characterized in that the deviation of the first and the second measured values from the predetermined or predefinable setpoint value is simultaneously determined by means of a single controller (C) and that, alternatively, the first or the second closed-loop control system is selected. Method according to Claim 10 or 11 , characterized in that the first and the second measured values are evaluated with regard to the achievement of a bending straightening result according to predetermined criteria, and that the first or the second closed loop is selected as a function of the evaluation. Method according to one of Claims 10 to 12 , characterized in that the first and second measured values are simultaneously displayed to an operator and / or that the first or the second closed-loop control is manually selectable by an operator. Method according to one of the preceding claims, characterized in that the method is initially operated on the basis of the first measured values from the pull-up region (50) in the first closed loop until the directional strip-shaped material (10) engages the measuring roller (36) in the pull-down region (52). has reached, and that subsequently switched to the second closed loop in Niederzugbereich (52). Method according to one of the preceding claims, characterized by storing previously determined during operation of the stretch-bending straightening system operating parameters for the stretch bending straightening system together with data on the processed with these operating parameters material in a database (44) and using the stored data for the processing of comparable materials. Program with a program code set up and / or programmed to operate the stretch-bending straightening system according to one of Claims 1 to 9 and / or for carrying out the method according to one of Claims 10 to 15 if the program code is executed on a computer, a processor or a programmable hardware component.

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