CN102123800B - Method for adjusting the tensile stress of a strip, control and/or adjustment device and industrial plant for processing a strip - Google Patents

Abstract

The invention relates to an industrial device and a method for controlling the tensile stress of a strip (B), in particular a metal strip, wherein the strip (B) is guided simultaneously by means of a first composite roller (2) and by means of a second composite roller (3), wherein an actual tension conversion ratio is determined (24, 25) for each of the first and second composite rollers (2, 3). The operation of the device for processing strip-shaped material, in particular metal strip, can be improved in that the actual tension conversion ratios of the first and second composite rolls (2, 3) are set by means of a change in the tensile stress of the strip between the composite rolls (2, 3) in such a way that the respective actual tension conversion ratio approaches (26) the respective predetermined nominal tension conversion ratio of the first and second composite rolls.

Description

Method, control and/or regulating device for adjusting the tensile stress of a strip, and industrial plant for processing strip

technical field

The invention relates to a method for adjusting the tensile stress of a strip. Furthermore, the invention relates to a control and/or regulating device for carrying out the method, a program code, a storage medium and an industrial plant for processing strip, in particular metal strip. the

Background technique

The composite rolls as used in the invention are used, for example, in the rolling of metal strips, in particular in cold rolling, and in processing lines such as coating, pickling, heating or similar process treatments of metal strips. These composite rolls are used to adjust the strip stress for the metal strip to be processed. Strip stresses, for example, significantly influence the reduction in thickness during processing, for example when rolling a rolled stock. These composite rolls are also frequently referred to as tension roll sets. the

However, these composite rollers can also be used, for example, in the textile industry for fabric belts or in the plastics industry for plastic belts and thus also use the above-mentioned methods. the

Contamination of the roller surface by the rollers of the composite roller, overloading of the drive or unfavorable drive load distribution of the drive for driving the rollers of the composite roller, for example, individual rollers or multiple rollers of the composite roller may The strip slides underneath. Undesirable relative movements thus occur between the roller surfaces of the one or more rollers and the strip which is guided by the composite roller or by the rollers of the composite roller. the

In the case of strip slippage in plants for processing metal strips, such as rolling mill trains, the operators of the rolling mill train and maintenance personnel are empirically incapable of recognizing the strip slippage and interpreting the strip slippage from the corresponding messages from the plant. Effects arising from this in for example backward running equipment, cracking messages in the metal strip or very high coatings in the metal strip. It is also difficult for said personnel to visually spot slipping rolls at the site of the composite rolls. the

However, slippage of the strip, in particular a metal strip, entails other disadvantages in addition to the process defects that occur during rolling. For example, if the metal strip slides over the rollers without being noticed for a long time, wear of the usually present special coating of the sliding rollers will occur. As a result, the coefficient of friction on the outer sides of the rolls is reduced and problems occurring during the rolling process become more serious. Furthermore, damaged rollers - after discovery - must be replaced. This leads to additional costs, since, if necessary, plant shutdowns are required due to the need to replace damaged rollers. the

Sliding rollers can lead to serious quality losses for the metal strip being produced or processed or to be processed. The surface of the metal strip can be damaged by the metal strip sliding over the rollers, but this can at least lead to defective products, which in turn lead to economic losses for the operator. the

All these effects are undesirable for the economical operation of plants for processing metal strips, such as rolling mills and/or processing lines. It is known from JP 60231517 A to measure the strip tension between the first tension roll and the rolling stand in the flow direction and between the rolling stand and the second tension roll arranged behind and to compare the measured signal with the reference value for comparison. In the event of a deviation between the corresponding measurement signal and the reference value, the strip tension is adjusted via the rolling stand. the

Contents of the invention

The object of the present invention is to provide a method, a device and a program code by means of which slippage of the strip can be reduced or avoided in a strip processing plant. the

The method part of this task is solved by a method for adjusting the tensile stress of a strip, in particular a metal strip, wherein the strip is simultaneously guided by means of a first composite roller and by means of a second composite roller, Wherein, the actual tension conversion ratios are respectively obtained for the first and second composite rollers, wherein, the absolute actual tension conversion ratios and the relative actual tension conversion ratios are respectively obtained for the first and second composite rollers in this way: The absolute actual tension conversion ratio is stated as the quotient of the higher actual strip tension and the lower actual strip tension or as the quotient of the higher nominal strip tension and the lower nominal strip tension to find; as a scale for the relative tension conversion ratio, use the numerator formed by the product of the first factor and the second factor 100 and the denominator of the quotient formed by subtracting one from the largest absolute tension conversion ratio , wherein the first factor is formed by subtracting one from the absolute tension conversion ratio, wherein the first and second composite The actual tension conversion ratios of the rolls are such that the respective actual tension conversion ratios approach the respectively predeterminable setpoint tension conversion ratios of the first and second composite rolls. the

The setpoint tension conversion ratio can be predetermined statically or dynamically. Preferably, the nominal tension conversion ratio used is dynamic, that is to say at least correspondingly adapted to the material passing through the device. In particular, the setpoint tension conversion ratio can be realized as a function of the design of the composite rollers used with regard to the tension conversion ratio and/or as a function of the drives assigned to the composite rollers. the

On the one hand, overloading of the drives assigned to the respective compound rolls is thereby avoided as far as possible. In addition, the adjustment according to the invention of the tension conversion ratio of the composite rollers completely avoids a sliding movement of the strip for one or more rollers, or only when the overall load of the drive device driving the composite rollers is significantly higher. A sliding movement of the strip occurs. This significantly improves the operation of industrial plants that process strip-shaped materials. the

Composite rolls generally refer to a spatially adjacent collection or arrangement of at least two rollers, which all have a strip meshing state (banding riff) during the adjusting operation of the composite rolls. As an alternative, the concept of tensioning roller sets is also used for the concept of composite rollers. the

The rollers of the composite roller accordingly have a wrap angle of at least 30° during adjustment operation. The rollers are not used for plastic deformation of the strip, such as occurs during rolling with rolls. The web engagement of the composite rollers usually takes place at specific points only from one side of the web and not simultaneously from the opposite web side. the

Additional units to be passed through by the strip can be arranged between the composite rollers, such as a strip store, or it is also possible to simply transport the strip between the composite rollers, and for the device in addition to the changeover of the strip tension There are no other functions other than the conveying of the strip. the

In particular the method can be used for more than two composite rolls. However, the method described can already be used advantageously when using two compound rolls. the

In particular, the method can advantageously be implemented as a control and/or regulation method. In particular, the method can also be used outside the metal industry, for example in the paper industry, the textile industry and the plastics industry, especially in all those places where strip-shaped materials have to be processed in industry. the

The method is simple to implement for existing plants and thus contributes to a considerable improvement in the operation of old plants within the scope of plant modernization. the

In a particularly advantageous refinement of the invention, the tensile stress is varied such that the nominal tension conversion ratios of the first and second composite rollers are substantially the same. This distributes the total load on the drives of the composite rolls, which distribution is particularly advantageous. With such a configuration, slippage of the strip can be avoided particularly well. the

In a further advantageous embodiment of the invention, absolute and/or relative tension conversion ratios are used as tension conversion ratios. The absolute pull conversion ratio is the quotient of the higher nominal strip tension set for a composite roll and the lower nominal strip tension set for the same composite roll or the ratio of the higher load on the composite roll The quotient of the actual strip tension on the top and the lower actual strip tension loaded on the same compound roll. Within the scope of the present application, the relative tension conversion ratio means a quotient which links the absolute tension conversion ratio of the composite roll to the maximum absolute tension conversion ratio of the composite roller. For example, the following relationship can be used for the relative actual tension conversion ratio/nominal tension conversion ratio:

Relative actual tension conversion ratio/rated tension conversion ratio=((absolute actual tension conversion ratio/rated tension conversion ratio-1)*100)/(absolute maximum tension conversion ratio-1).

The maximum absolute tension conversion ratio is a property of the compound roll used and is usually specified by the supplier or manufacturer of the compound roll. In particular, the use of the relative tension conversion ratios is advantageous for the procedure described above. the

In another advantageous embodiment of the invention, the relative actual tension conversion ratio of the first and second composite rollers and/or the strip loaded on the first and/or second composite rollers Change the tensile stress based on the tensile force. This makes it possible to set as favorable a tension conversion ratio as possible for the respective composite roller during the entire processing of the metal strip passing through the composite roller. Depending on the relative actual tension conversion ratio of the first and second composite rollers, the tensile stress between the composite rollers is adjusted as directly as possible, thereby increasing the process reliability and rapidity of the method. the

In a preferred design solution of the present invention, for the substantially same maximum absolute tension conversion ratio of the first and second composite rollers, the tensile stress of the strip between the composite rollers is changed to One is substantially the same as the strip tension on the feed side of the first compound roll arranged in front of the second compound roll in the direction of mass flow and the discharge side of the second compound roll arranged behind the first compound roll in the direction of mass flow The strip tension forms the same value as the geometric mean. This makes it possible in a particularly simple manner to provide a tensile stress which achieves an improved distribution of the tension conversion ratio of the first and second composite rollers and thereby avoids the disadvantages mentioned in the introduction to the description. . In this case, an advantageous tension conversion ratio for the first and second composite roller and thus an advantageous load distribution for the drives assigned to the composite roller can be achieved in a particularly simple manner. the

In an alternative embodiment of the invention, for different maximum absolute tension conversion ratios of the first and second composite rollers, at opposite sides of the first and second composite rollers The tensile stress of the strip between the composite rollers is changed based on the deviation of the actual tension conversion ratio. It is particularly advantageous if the tensile stress is varied in such a way that the deviation of the relative actual tension conversion ratios of the first and second composite rolls is reduced and preferably approaches zero. An advantageous tension conversion ratio and thus an advantageous load distribution for the drives assigned to the composite rollers can thus be achieved for the first and second composite rollers having very different designs. This ensures that the first and second composite rollers have essentially the same tension conversion ratio, whereby the advantages of the invention are taken into account to a certain extent. the

In a further advantageous refinement of the invention, the change in the tensile stress is brought about by means of a redistribution of the drive load between the drives distributed to the first and second composite rollers. As a result, the tensile stress between the composite rolls can be changed particularly easily and automatically. In particular, no additional mechanisms are required for adjusting the tension conversion ratio for the two composite rollers. As a result, the method can be implemented in an especially simple manner for existing installations. the

The device-wise part of the task is solved by means of a control and/or regulation device for an industrial plant, especially a rolling mill and/or a processing line, the control and/or regulation device having a machine-readable program code, The program code includes control instructions which, when executed, cause the control and/or regulating device to carry out the method according to one of claims 1 to 7 . the

The part of the task corresponding to the program code is solved by a machine-readable program code for a control and/or regulation device for processing a strip, in particular a metal strip Composite rolls of industrial equipment such as rolling mills and/or processing lines, wherein said program code has control instructions which cause said control and/or regulating means to implement the method according to any one of claims 1 to 7 method. the

The device part of the problem is solved by a storage medium having stored thereon a machine-readable program code according to claim 9 . the

Finally, the device-wise part of the problem is also solved by an industrial plant, in particular a rolling mill and/or a processing line, which has a first compound roll and a second compound roll and has the A control and/or adjustment device, wherein the first composite roller and the second composite roller are respectively used to adjust the strip stress of the strip simultaneously guided by it, wherein the control and/or adjustment device is the same as the first composite roller The one and/or the second composite roller is operatively connected for the control and/or regulation thereof, in particular for the control and/or regulation of the drives assigned to the respective composite roller. the

Description of drawings

Further advantages of the invention are obtained from the following exemplary embodiments, which are explained in detail below with the aid of schematic drawings. The accompanying drawings show:

Fig. 1 is suitable for implementing the industrial plant by the method of the present invention,

FIG. 2 is a schematic flow chart for an exemplary illustration of an embodiment of the method according to the invention.

Detailed ways

FIG. 1 shows a section of an industrial plant 1 , in particular a processing line for processing a metal strip B . the

The plant comprises a rolling area 5 with a rolling stand 5' to which strip stress measuring devices 7 in the form of measuring rolls are attached. The strip stress of the strip conveyed out of the rolling zone is detected by means of measuring rolls 7 . Usually high strip tensions are required for rolling in the rolling zone 5 in order to avoid problems during the handling of the metal strip B. the

According to FIG. 1 , the section under investigation of the metal strip B is guided in the direction of mass flow after passing the first strip stress measuring device 7 through the first composite roller 2 , with which the metal strip B can be adjusted. Tensile stress of strip B. After passing through the first compound roll 2 , the strip stress is detected again with a further strip stress measuring device 7 . the

The studied section of the metal strip B then passes in the direction of the mass flow through a strip store 4 in which the metal strip B can be stored if necessary in order to be able to control the device. Different processing speeds in different parts are compensated. The strip storage 4 is an exemplary unit arranged between the first composite roll 2 and a second composite roll 3 arranged behind the strip storage 4 . the

A further strip stress measuring device 7 is arranged between the strip store 4 and the second composite roll 3 . As a result, the strip stress or strip tension of the metal strip B entering the second compound roll 3 can be detected. the

The metal strip B is guided through a second composite roll 3 , downstream of which a further strip stress measuring device 7 is arranged. This strip stress measuring device 7 allows detection of the strip stress of the metal strip B emerging from said second composite roll 3 . This arrangement of the strip stress measuring device 7 according to FIG. 1 is advantageous because the actual tension conversion ratio for the first and second compound roll 2 or 3 can thus be easily determined. the

After the section of the metal strip B under consideration has been removed and passed the measuring roll 7 arranged downstream of the second composite roll, this section is, for example, introduced into the furnace region 6 . There, the metal strip B is heat-treated with a lower strip tension. the

Since the metal strip B exits the rolling zone 5 with a higher strip tension and enters the furnace zone 6 with a lower strip tension, a strip is required in the region between them of the processing line 1 Pull conversion. This is done according to FIG. 1 with the first and second compound rolls 2 and 3 shown. the

Furthermore, the section of the processing line 1 shown in FIG. 1 shows a control and regulation device 8 which is connected to the above-mentioned strip stress measuring device 7 and to the first and second The drives of the two compound rolls 2 or 3 are functionally connected. the

In order to carry out an exemplary embodiment of the method, a machine-readable program code 10 is supplied to the control and regulation device 8 by means of a storage medium 9 and the machine can A read program code 10 is stored in the stored programming, which program code 10 has control instructions which, when the program code is executed, cause the control and regulating device 8 to carry out the method. the

The strip tension detected by means of the strip tension measuring device 7 is supplied to the control and regulation device 8 before and after the first or second composite roll 2 or 3 . The control and regulating device 8 then ascertains therefrom the absolute and relative actual tension conversion ratios for the first and second compound rolls 2 and 3 . the

The absolute actual tension conversion ratio is, for example, a quotient of the higher actual strip tension and the lower actual strip tension or as a quotient of the higher nominal strip tension and the lower nominal strip tension. Quotient to obtain. the

As a measure for the relative tension conversion ratio, the numerator formed by the product of the first factor and the second factor 100 and the denominator of the quotient formed by the maximum absolute tension conversion ratio minus one can advantageously be used A quotient, wherein the first factor is formed by subtracting one from the absolute tension conversion ratio. the

It follows from this that at an absolute actual tension conversion ratio of one, that is to say with no tension difference loaded on the composite rolls, the relative tension conversion ratio is equal to zero, and at an absolute actual tension conversion ratio of maximum absolute When the actual pull force conversion ratio is the size, the relative pull force conversion ratio is equal to 100. the

If the relative actual tension conversion ratios of the first and second composite rolls 2 or 3 are not substantially the same, then the control and/or regulation device is oriented towards the desired tension for the corresponding composite roll 2 or 3 The direction of the relative nominal tension conversion ratio changes the relative actual tension conversion ratio. the

If the absolute actual tension conversion ratio of the composite roller 2 or 3 is greater than the maximum absolute tension conversion ratio, that is to say the relative tension conversion ratio is greater than 100, then it will exceed the composite of the maximum absolute tension conversion ratio. The strip slips inside the roll 2 or 3. the

In order to prevent the strip from slipping, the tension conversion ratios of the first and second composite rollers 2 and 3 are adjusted in such a way that the relative tension conversion ratios of the first and second composite rollers are correspondingly substantially the same. As a result, the distribution of the drive load to the drive of the respective compound roll 2 or 3 is provided with a load distribution that is as favorable as possible without slippage of the strip. the

Since the rolling zone 5 shown in FIG. 1 is a high-tension zone, a high strip tension must be maintained in this rolling zone 5 in order to be able to carry out pre-rolling. If a reduction in the strip stress occurs in the high-tension area for adjusting the relative tension conversion ratio of the compound roll 2 or 3 , this can trigger various problems such as strip deviation and tension oscillations. the

Likewise, the strip stress cannot be increased arbitrarily in the region of low tension shown in FIG. 1 in the form of the furnace region 6 . If the strip stress is increased here to adjust the tension conversion ratio of the composite rollers 2 or 3 relative to one another, this can lead to scratches on the strip or mechanical damage to the installation. the

Therefore, according to the invention, the relative tension conversion ratio for the first and second compound rolls 2 or 3 is adjusted by adjusting the metal strip between the first compound roll 2 and the second compound roll 3 of tensile stress. the

The tensile stresses for the strip sections arranged between the rollers are preferably varied such that the relative tension conversion ratios of the first and second compound rollers 2 and 3 are set to substantially the same value. This ensures the best possible distribution of the total load between the drive loads of the motor 11 or drive driving the composite rollers, so that slippage of the strip can be avoided. the

FIG. 2 shows a flow chart for schematically illustrating the sequence of an embodiment of the method according to the invention. The starting point for the flow chart shown in FIG. 2 is that the industrial plant 1 of FIG. 1 is in operation and the metal strip B is guided through the industrial plant 1 . If device names with reference signs are to be mentioned next, these refer to the device shown in FIG. 1 . the

In the four method steps 20 , 21 , 22 or 23 which are carried out in parallel in time, by means of the respectively present strip stress measuring device 7 on the feed side and the discharge side of the respective compound roll 2 or 3 Detects the strip tension of the strip. the

From the strip tension detected on the infeed side and the outfeed side for the respective composite roller 2 or 3, the relative tension for the respective composite roller 2 or 3 is determined in method step 24 or 25 conversion ratio. the

For this purpose, the absolute actual tension conversion ratio for the respective composite roller 2 or 3 is first ascertained by dividing the higher or actual strip tension on the respective composite roller 2 or 3 by The lower strip tension detected in method steps 20 , 21 , 22 or 23 or the actual strip tension applied to the respective compound roll 2 or 3 . the

The absolute actual tension conversion ratio currently present for the respective compound roll 2 or 3 is now compared with the maximum absolute tensile force conversion for the respective compound roll that can reliably be present at the highest on the compound roll 2 or 3 Than link up. the

The maximum absolute tension conversion ratio for the first compound roll 2 and the second compound roll 3 may be of different magnitudes or of the same magnitude. This is the technical design and dimension of the corresponding compound roll 2 or 3 . the

The variable now obtained is a measure for the relative actual tension conversion ratio of the first composite roller 2 and the relative actual tension conversion ratio of the second composite roller 3 . the

It is now checked in method step 26 whether the ascertained relative actual tension conversion ratio deviates from the predetermined relative target tension conversion ratio. The relative target tension conversion ratios for composite roll 2 or 3 are preferably predetermined such that they are the same for first and second composite roll 2 or 3 . the

If there is no deviation between the actual tension conversion ratio of the composite roll 2 or 3 and the relative nominal tension conversion ratio, the method is restarted, that is to say, the detection of the tension for the corresponding composite roller is carried out by means of the strip stress measuring device 7 . Strip tension on the infeed and outfeed side of roll 2 or 3. the

If, on the contrary, there is a deviation between the relative actual tension conversion ratio of the corresponding composite roller 2 or 3 and the relative nominal tension conversion ratio, then in method step 27, the belt between the composite rollers 2 or 3 is determined. The tensile stress of the material, thereby reducing the deviation between the actual tension conversion ratio and the rated tension conversion ratio. the

Especially advantageous. The tensile stress is determined by means of which the actual tension conversion ratios of the first and second compound roll 2 or 3 are equal to one another. This is because a particularly favorable distribution of the overall load of the drive or motor 11 for driving the compound roll 2 or 3 can thus be provided. This prevents, in particular, the occurrence of strip slippage that occurs when the total load is relatively small, that is to say the sum of the loads formed by the drive loads distributed to the drives of the first and second compound rollers is relatively small, and said strip slips through the total load to a disadvantage. Distributed to the drive of the composite roll 2 or 3. the

Depending on the maximum absolute tension conversion ratio of the first and second composite rollers 2 or 3, the tensile stress to be adjusted between the composite rollers 2 or 3 can be ascertained differently in method step 27 Or the change to be adjusted of the tensile stress between the composite rollers 2 or 3 . the

If, for example, the first composite roller 2 and the second composite roller 3 have the same maximum absolute tension conversion ratio, then the tensile stress for the strip region arranged between the composite rollers 2 or 3 can be obtained according to FIG. 1 It is particularly easy to determine as a geometric mean value of the current feed-side strip tension of the first roller 2 and the current discharge-side strip tension of the second composite roll 3 . the

If the first composite roller 2 and the second composite roller 3 have different maximum absolute tension conversion ratios, for example due to structural differences, then the adjustment between the composite rollers 2 or 3 can preferably be performed by means of a PI regulator. changes in tensile stress. the

The input value for this PI controller is, for example, a measure for the deviation of the relative actual tension conversion ratios of the two compound rolls 2 or 3 . the

The PI controller then preferably regulates the variation of the tensile stress between the composite rollers 2 or 3 in such a way that the relative actual tension conversion ratios of the first and second composite rollers 2 or 3 are identical to one another. the

In method step 28 , the tensile stress of the strip B in the strip region between the composite rollers 2 or 3 is adjusted by varying the distribution of the drive load distributed to the composite roller drive or motor 11 . the

It is then usually rechecked whether the relative actual tension conversion ratio of the composite roller 2 or 3 still has the desired value, that is to say whether it is converted to the desired relative nominal tension of the composite roller 2 or 3 than the same. the

The method is carried out until the end of the processing of the metal strip B in the processing line 1 of FIG. 1 . the

In the exemplary embodiment, after each implementation of the method, it is asked in method step 29 whether the method should be terminated. the

Preferably, in method steps 20 to 24, the strip tension is detected continuously and temporally parallel to the processing of the previously detected strip tension and is further processed, thus ensuring the highest possible measurement of the method density and thus ensures a corresponding adjustment accuracy of the method. the

By means of the method disclosed within the scope of the present application, it is possible to distribute the total load to the drives or motors of the composite rollers as best as possible, so that even in the total load assigned to the drives or motors of the composite rollers Even when the load is high, it is possible to prevent the strip from slipping on one or more rollers of at least one of the composite rollers. As a result, the operation of the plant is improved, the wear of the rolls of the composite roll is reduced and the process stability is increased. the

In a variant of the explained exemplary embodiment, the method can also be advantageously used in industrial plants for processing strip-shaped materials. the

Claims (13)

1. be used for the method for the tension of adjusting band (B), wherein, simultaneously come the described band of delivery (B) by means of the first compound roller (2) and by means of the second compound roller (3), wherein, be so the described first and second compound rollers (2, 3) try to achieve respectively (24, 25) absolute actual pulling force is changed when relative actual pulling force conversion ratio: described absolute actual pulling force conversion is compared to the quotient or the conduct that are made of higher actual band pulling force and lower actual band pulling force and is tried to achieve by the quotient that higher specified band pulling force and lower specified band pulling force consist of, as the yardstick that is used for relative pulling force conversion ratio, the molecule that use is formed by the product with the first factor and the second factor 100 and the quotient that is consisted of than the denominator that deducts a quotient that forms by the absolute pulling force conversion of maximum, wherein said the first factor is formed than deducting one by absolute pulling force conversion, wherein, by means of described compound roller (2, the described first and second compound rollers (2 are regulated in the variation of the tension of the band 3), 3) actual pulling force conversion ratio, make actual pulling force conversion ratio separately compare near the specified pulling force conversion that the phase of (26) described first and second compound rollers should be able to be given in advance.

2. press method claimed in claim 1,

It is characterized in that, change (27) described tension, make the specified pulling force conversion of the described first and second compound rollers (2,3) than substantially the same.

3. press the described method of claim 1 or 2,

It is characterized in that, described band (B) is sheet metal strip.

4. press the described method of claim 1 or 2,

It is characterized in that, the relative actual pulling force conversion of described the first and second compound rollers than and/or be carried on the basis of the band pulling force on the described first and/or second compound roller and change (27) tension.

5. press method claimed in claim 4,

It is characterized in that, absolute pulling force conversion for the substantially the same maximum of the described first and second compound rollers (2,3) is compared, tension that will the band (B) between described compound roller (2,3) change to (27) basically with by the band pulling force of the feed side of the first compound roller (2) that is arranged in the described second compound roller (3) front along the mass flow direction be arranged in the identical numerical value of the geometrical mean of band pulling force formation of exit side of the second compound roller (3) of the described first compound roller (2) back along the mass flow direction.

6. press method claimed in claim 4,

It is characterized in that, absolute pulling force conversion for the different maximum of the described first and second compound rollers (2,3) is compared, and changes (27) described tension on the basis of the deviation of the relative actual pulling force conversion ratio of the described first and second compound rollers (2,3).

7. press the described method of claim 1 or 2,

It is characterized in that, cause the change of (28) described tension by means of the redistribution of the load of the driving between the drive unit (11) of distributing to the described first and second compound rollers (2,3).

8. press method claimed in claim 4,

It is characterized in that, cause the change of (28) described tension by means of the redistribution of the load of the driving between the drive unit (11) of distributing to the described first and second compound rollers (2,3).

9. press method claimed in claim 5,

It is characterized in that, cause the change of (28) described tension by means of the redistribution of the load of the driving between the drive unit (11) of distributing to the described first and second compound rollers (2,3).

10. press method claimed in claim 6,

It is characterized in that, cause the change of (28) described tension by means of the redistribution of the load of the driving between the drive unit (11) of distributing to the described first and second compound rollers (2,3).

11. industrial equipment (1), have the first compound roller (2) and the second compound roller (3) and have for control and/or the adjusting device (8) implemented by the described method of claim 1 to 10 any one, wherein, the described first compound roller (2) and the second compound roller (3) are respectively used to regulate the web stress by the band (B) of its delivery simultaneously, wherein, described control and/or adjusting device (8) have been carried out effect with the described first and/or second compound roller (2,3) and have been connected, and are used for it is controlled and/or regulates.

12. by the described industrial equipment of claim 11 (1), this industrial equipment (1) is milling train and/or processes line.

13. by the described industrial equipment of claim 11 (1), described control and/or adjusting device (8) have been carried out effect with the drive unit (11) of distributing to the described first and/or second compound roller (2,3) and have been connected, and are used for it is controlled and/or regulates.

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