DE2815341C2 - - Google Patents

Description

The invention relates to a method and a Circuit arrangement for regulating the longitudinal force in one Rolled stock between rolling stands of a continuous Rolling mill with individual drives, the speed of the rolling stock on the outlet side of a roll stand measured and to form a mathematical link value is used, which in turn over the change in the speed of the rollers of the one stand keeps the longitudinal force constant, with the additional mathematical linkage value depending on occurring Corrected changes in cross-section of the rolling stock becomes.

In a continuous rolling mill with individual drives the rolling stock is in several rolling stands at the same time and it goes through this successively, with everyone Framework a certain stitch acceptance, d. H. a reduction of the material cross section. The single ones Roll stands are mechanically connected to each other via the rolling stock coupled. The speeds of the drives of the roll stands  must be coordinated so that in the rolling stock no tensile or compressive forces arise, or that one specified tensile or compressive force is observed. It So once given longitudinal forces during the Pass through the rolling stock are maintained, this Longitudinal forces a certain value or also the value Can have zero.

A current control of drives for roll stands with a speed controller, which is a setpoint for a Current regulator forms is known from DE-OS 16 02 020.

Draft and pressure freedom is achieved with thin rolling stock deliberate formation of a rolled material loop between two Roll stands causes. A loop regulation adjusted the speeds of the roll stands so that the loop formation preserved. With larger material cross sections however, this is no longer possible.

Excessive pressure in the rolling stock then leads to a lateral pressure Breaking out of the material and has in a sustainable manner too large cross-sectional tolerances result.

A known "synchronous device for multi-motor drive a continuous rolling mill "(DE-PS 12 01 466) with the entry of the rolling stock into the Roll stands at this moment free of longitudinal force Speed structure between the stands, taking as a reference value the armature currents for freedom from longitudinal forces in the rolling stock serve the respective drives.  

Another well known "mutual facility Coordinating the drive speeds of a multi-stand Rolling mill with individual drives "(DE-AS 24 13 492) used Changes to the drive torque on the already threaded Framework as a measure of the longitudinal forces in the rolling stock.

In these known devices, it is disadvantageous that the once set speed structure of the rolling mill is not changed if by disturbances, for example Material cross-section deviations at the inlet Longitudinal forces occur during the passage of the rolling stock. In particular, the reference values depend on armature current or drive torque - viewed over long periods of time - too much on the temperature of the rolling stock than that it as a measure of a longitudinal force control over the entire Throughput period of the rolling stock could serve.

For this reason, according to one of the further known "Process for controlling continuously operating roller mills" (DE-AS 12 79 589) the quotient of the rolling torque to roller pressure force as a reference value for a temperature-independent Longitudinal force control proposed.

However, a disadvantage of this known method is that that the measurement of the roller pressure force is very complex and poorly convert existing systems to let. In addition, the quotient of the rolling torque increases Roll pressure force due to material cross-section deviations changed, so that this quotient is only conditionally used as a measure can be used for longitudinal force control.  

From DE-OS 14 52 051, which is based on the preamble of claim 1, is a procedure for regulation the longitudinal force at which the speed of the Rolled stock measured on the outlet side of a roll stand and is used to form a reference variable. This is used to calculate the setpoint of the belt speed the belt speed on the outlet side on the inlet side and the cross-sectional decrease used. A consideration of cross-sectional deviations at the inlet is a cross-section measuring device reached. In this regulatory procedure for Determination of the target speed of the rolling stock only the rolling speed in front of and behind each stand measured and with cross sections of the inlet and outlet rated.

The invention has for its object a method of the type mentioned at the beginning (DE-OS 14 52 051) to regulate the longitudinal force between rolling stands one to develop a continuous rolling mill with individual drives, with the help of which the speeds of the roll stands with each other during the entire rolling process can be coordinated that none or a defined constant longitudinal force occurs between the scaffolding.

Furthermore, it is an object of the invention to provide a circuit arrangement to carry out this procedure develop.

This task is combined with the generic term according to the invention in the characterizing part of the claim 1 mentioned features solved. Advantageous further training of the invention and the circuit arrangement to carry out the method are in the subclaims specified.  

The advantages associated with the invention are in particular in that the rolling stock is independent of temperature and material cross-section to specified Longitudinal force between the roll stands throughout Pass through the rolling mill can be regulated can. This advantageously has small cross-sectional tolerances of the rolling stock.

The method and exemplary embodiments according to the invention for this purpose are explained below with reference to the drawings.

It shows

Fig. 1 shows a circuit arrangement of the invention for regulating the longitudinal force,

Fig. 2 is an alternative to this circuit arrangement,

FIGS. 3 and 4 coupling possibilities between the individual rolling stand control arrangements.

In Fig. 1, a circuit arrangement according to the invention for regulating the longitudinal force between the roll stands is shown a continuous rolling mill with individual drives. Two rolling stands 1 and 2 with individual drives 3 and 4 , for example, are shown here from the rolling mill itself. The rolling mill can have any number of other roll stands.

The rolling stock 5 passes through the individual roll stands 1 and 2 , whereby it undergoes a reduction in the material cross section and an increase in the outlet speed in each roll stand 1 and 2 . The material cross sections of the rolling stock 5 in front of the roll stand 1 , after the roll stand 1 and after the roll stand 2 are denoted by A ₀, A ₁ and A ₂. The outlet speeds of the rolling stock 5 before the roll stand 1 , after the roll stand 1 and after the roll stand 2 are denoted by v ₀, v ₁ and v ₂.

The individual drives 3 and 4 have the speeds n ₁ and n ₂ and have drive motors 6 and 7 and tachometer generators 8 and 9, respectively. The roller circumferential speeds of the rollers of the individual drives 3 and 4 are denoted by v _{u 1} and v _{u 2} . The drive motors 6 and 7 are fed via converters 10 and 11 , respectively. For motor current measurement, current transformers 12 and 13 are arranged between drive motor 6 and converter 10 or between drive motor 7 and converter 11 . To measure the speed of the rolling stock 5 , 2 speed measuring devices 14, 15 and 16 are provided in front of the roll stand 1 , after the roll stand 1 and after the roll stand.

The current transformers 12 and 13 are each connected to current regulators 17 and 18 , respectively, the current signals I ₁ and I ₂ being supplied to the current regulators 17 and 18 with a negative sign. The tachometer generators 8 and 9 are connected to speed controllers 19 and 20 , with a negative supply of the corresponding signals - here speed signals n 1 and n 2 - also taking place.

The outputs of the speed controllers 19 and 20 are at the inputs of the current controllers 17 and 18 . On the output side, the current regulators 17 and 18 are fed to the converters 10 and 11, respectively.

The speed signalsn₁ orn₂ act further Lead actual value generator21st respectively.22. These actual value formers 21st respectively.22 speed signals are also on the input side v₁ orv₂ the speed measuring devices 15 respectively.16 at. The signals are on the output side _{is 1} respectively. _{is 2} the actual value generator21st respectively.22  to save23 respectively.24th fed. Furthermore, the Output signals _{is 1} respectively. _{is 2} the actual value generator 21st respectively.22 negatively at addition points25th  respectively.26.

The stores23 respectively.24th are on the output side with advance Setpoint formers27 respectively.28 connected. The output signals _{should 1} respectively. _{should 2} this setpoint generator 27 respectively.28 act on the addition points25th  respectively.16. The setpoint generator27, 28 each have one another input to correct the input signals.

The output signals of the addition points 25 and 26 are fed to longitudinal force controllers 29 and 30, respectively. The output values of the longitudinal force controllers 29 and 30 are at inputs of the speed controllers 19 and 20 .

The components and connections shown in dashed lines in FIG. 1 are initially disregarded for the description of the functioning of the circuit arrangement according to the invention.

In the inventive method and the circuit arrangements this is the lead  as a reference used for a longitudinal force control. The advance    itself is calculated from the two sizes Outlet speedv of the rolling stock5 behind one Mill stand1 respectively.2nd and roll peripheral speedv _u  the roller itself and is defined as:

in which
ν = 1, 2, 3 ,. . . the number of the respective mill stand,
v _ν = outlet speed of the rolling stock 5 , z. B. v ₁, v ₂,. . ., and
v _{u ν} = roller circumferential speed of the roller of the individual drive, e.g. B. v _{u 1} , v _{u 2,.} . .

means.

Other possible definitions of the lead are:

 =v _ν  -v _{u ν}

or

Why the advance  apply as a measure of the longitudinal force can be explained below. When going through of the rolling stock5 through the rolling mill applies at every point the law of volume constancy for the rolling stock5, d. H. during a certain timet =t₀ it is Product from the outlet speedv _ν  and the material cross section A _ν  at every point of the rolling stock5 constant (in whichν = 1, 2, 3,. . .), so

v ₁ · A ₁ = v ₂ · A ₂ = v ₃ · A ₃ = v _ν · A _ν = constant.

For example, is the speedn₁ of the roll stand1 to small, so longitudinal forces occur in the rolling stock5 on who the Rolling stock5 with greater lead  from the mill stand 1 pull, or there the material cross section of the rolling stock 5 constrict according to the law of constant volume. As a result, the advance increases  with tensile forces between two roll stands, vice versa reduced the pressure forces between two roll stands.

The circumferential roller speed v _{u ν} is determined from the speeds n of the individual drives determined by the tachogenerators 8 and 9, respectively

v _{u ν} = 2 π · r _ν · n _ν

in which
r _ν = radius of the roller of the single drive,
n _ν = speed of the individual drive.

For the method according to the invention or the circuit arrangements for this, it is insignificant at which point on the roller the peripheral speed v _{u ν is} determined or determined via the speed n _ν , since ultimately it is not absolute values but changes in these values that are decisive for the control.

In particular, in the case of calibrated rolls in which it is difficult or impossible to specify a clear roll circumferential speed v _u , the radius r of the roll of the individual drive can be selected such that the same values for the roll are obtained in the period before the rolling stock enters the subsequent roll stand Circumferential speed of the roller and the outlet speed of the rolling stock result from this roller. This procedure is of course also possible with non-calibrated rolls.

The outlet speed v _{ν of} the rolling stock 5 is determined by the speed measuring devices 14, 15, 16 . For example, a contactless laser speed measuring device or a contactless correlation speed measuring device can be used as the precise speed measuring device.

A laser speed measuring device is for example under the name Laser Velemeter of measurement metallurgy, 5802 Wetter (Ruhr), Friedrichstrasse 40 known. The The speed is measured according to the difference Doppler method, i. H. it becomes the Doppler effect exploited, the moving material caused.

A correlation speed measuring device is for example from the notice technique TU 22 der Trindel, Siege Social, 44, Rue de Lisbonne, 75008 Paris. The speed measurement is based on the principle the optical intercorrelation. It is assumed, that the surface of a product is irregular has, which is detected by an optical system and can be evaluated, d. H. the characteristic of Natural radiation from the rolling stock can be used to measure speed be used.  

The formation of the actual values of the advance _{is 1} respectively. _{is 2} is done by the advance actual value generator21st  respectively.22 from the entered speed signalsn₁ or n₂ and the entered exit speed signals v₁ orv₂. In the actual value formers21st respectively.22 will the Actual values of the advance _{is 1} respectively. _{is 2} doing so, for example from the formula

calculated.

At the time before the rolling stock comes in5 in the subsequent roll stands formed actual values of Advance _{is 1} respectively. _{is 2} be saving23  respectively.24th fed and then serve for further regulation the longitudinal forces in the rolling stock5 throughout the run of the rolling stock5 through the rolling mill as target values the advance _{should 1} respectively. _{should 2}.

For this purpose, the memory transmit23 respectively.24th these Leading values  the setpoint formers27 respectively. 28, being in the setpoint formers27 respectively.28 certain Correction amounts can be added to one correspond to the given longitudinal force. In the addition points 25th respectively.26 the differences between the Setpoints and the respective actual values of the advance _should  and _is  formed and the longitudinal force regulators29  respectively.30th fed. It is also a direct feed the stored values for the advance  of the to save23 respectively.24th to the addition points25th respectively.26  possible if rolling is to be carried out without longitudinal force.  

The longitudinal force controller 29 and 30 and the downstream speed controller 19 and 20 convert the advance changes into speed changes, ie a change in the speed quotient n ₁ / n ₂ is effected. For this purpose, the speed controllers 19 and 20 are in addition to the correction signals of the longitudinal force controller 29 and 30, the speeds n ₁ and n ₂ in a negated manner.

The output signals of the speed controllers 19 and 20 act on subordinate current controllers 17 and 18 . The current regulators 17 and 18 control the converters 10 and 11 depending on the flowing motor currents I 1 , I 2 and the output signals of the speed regulators 19 and 20 .

In the following, the circuit arrangement according to FIG. 1 expanded by the dashed-line components and connections is considered. The speed signals v ₀ and v ₁ of the speed measuring devices 14 and 15 are fed to a stitch decrease generator 31 , while the speed signals v ₁ and v ₂ of the speed measuring devices 15 and 16 act on a stitch decrease generator 32 . On the output side, these stitch acceptance formers 31 and 32 are connected to the memories 23 and 24 and the advance setpoint formers 27 and 28 , respectively. The further circuit arrangement already described according to FIG. 1 remains unchanged.

Through the insertion of the stitch acceptance creator31 and32  account is taken of the fact that the advance  from the material cross section of the incoming rolling stock5  is dependent, d. i.e. there will be changes in the material cross section detected during the passage of the Rolled good5 occur through the rolling mill and this  Changes in the material cross section are included in the regulation involved.

The stitch decrease δ is defined as too

where ν = 1, 2, 3 ,. . .

Due to the constant volume mentioned above, the stitch decrease δ can also be formulated

The stitch decrease is therefore from the speeds of the Rolled goods at the inlet into and at the outlet from the roller dependent.

The stitch decrease δ _ν is calculated by the stitch decrease formers 31 and 32 . For this purpose, the stitch-off generator 31, the speed signals v ₀ and v ₁, the stitch-off generator 32, the speed signals v ₁ and v ₂.

The pass reduction δ _ν is fed to the corresponding store 23 or 24 in the period before the rolling stock 5 enters the respective subsequent rolling stand. A change in the stitch decrease δ during the passage of the rolling stock 5 through the rolling mill is immediately transmitted to the lead setpoint generator 27 or 28 .

In this way, i.e. H. by correcting the stitch-dependent Advance value  becomes the interference the stitch acceptanceδ on the lead that as a measure used for the longitudinal force.

Another possibility of incorporating a change in the material cross section of the rolling stock 5 into the longitudinal force control is to measure the material cross section of the rolling stock 5 directly at the respective entry into a rolling stand 1 or 2 . Since changes in cross-section in the rolling process are preferably noticeable in a change in the length of a dimension of the rolling stock 5 , the material cross-section can be inferred from contactless and continuous measurement of this length. So-called diode line cameras are suitable, for example, for measuring the length of a dimension of the rolling stock 5 .

Furthermore, cross-section changes can be determined other generally known rolling stock Processes, for example the eddy current process, be applied.

In FIG. 2, an alternative circuit arrangement for regulating the longitudinal force between the roll stands is shown a continuous rolling mill with individual drives. In contrast to the arrangement according to FIG. 2, the output values of the longitudinal force controller 29 or 30 are not directly at the inputs of the speed controller 19 or 20 , but are supplied to speed controllers 33 or 34 . On the input side, the speed controllers 33 and 34 also have the speed signals v ₁ and v ₂ present in negated form. On the output side, the speed controllers 33 and 34 act on the speed controllers 19 and 20 .

The further wiring of the arrangement accordingFig. 2 is as belowFig. 1 described. In particular, at according to the rule arrangementFig. 2 an optional correction the advance  about the stitch acceptance trainer31 respectively. 32 possible (shown in dashed lines).

By using the speed controller33 respectively.34  are the speedsn₁ orn₂ of the roll stands1 respectively. 2nd not only depending on the advance , rather also depending on the speeds on the outlet side v₁ orv₂ of the rolling stock5 regulated. The speeds n₁ orn₂ are adjusted so that the outlet of the Rolled good5 prescribed speed values from the roller v₁ orvSet ₂. The speed setpoint for the roll stand1 for example formed by a superimposed advance control in such a way that the measured and shortly before the arrival of the Rolled good5 in the subsequent mill stand2nd saved Lead value  is regulated to a value that of a predetermined longitudinal force between the roll stand 1 and the subsequent mill stand2nd corresponds. This lead value can change with changing Stitch acceptanceδ Getting corrected. The same goes for analogously for the other roll stands2nd and the following, so that after passing through the rolling stock5 through the entire rolling mill small cross-sectional tolerances of the Rolled good5 surrender.  

In FIGS. 3 and 4, coupling possibilities are shown between each rolling mill control arrangements with each other, namely, Figs. 3, a coupling possibility for the circuit of FIG. 1 and FIG. 4 is a coupling possibility for the circuit arrangement of FIG. 2.

FIG. 3 shows a continuous rolling train with the roll stands 1 and 2 and further roll stands 35 and 36 . Each roll stand has the control arrangement described in detail in FIG. 1. Of these control arrangements, only the speed regulators 19, 20 and further speed regulators 37, 38 and the longitudinal force regulators 29, 30 and further longitudinal force regulators 39, 40 are shown for simplification.

The individual control arrangements of the roll stands 1, 2, 35, 36 are connected to one another via couplers 41, 42 and 43 . To connect the couplers, the connections between speed controllers and longitudinal force controllers each have addition points.

In particular, the output signal of the longitudinal force controller 29 is fed to an addition point 44 , which is further connected on the input side to the coupler 41 and on the output side to the speed controller 19 .

The coupler 41 is also located at an addition point 45, which is supplied with signals from the longitudinal force controller 30 and from the coupler 42 on the input side and is connected to the speed controller 20 on the output side.

The coupler 42 is connected to an addition point 46 , to which the output values of the longitudinal force controller 39 and coupler 43 are fed and which itself acts on the speed controller 37 . The coupler 43 is connected to an addition point 47 , on the input side of the longitudinal force controller 40 and on the output side of the speed controller 38 .

FIG. 4 shows a coupling possibility between the individual mill stand control arrangements corresponding to FIG. 2. In contrast to the arrangement shown in FIG. 3, there are addition points between the longitudinal force regulators and the speed regulators.

In detail, in Fig. 4, the rolling stands 1, 2, 35 and 36 and the respectively associated to their control arrangements speed regulator 33, 34, 48 and 49 and the longitudinal force regulator 29, 30, 39 and 40 shown. The further circuit, not shown, is as described under FIG. 2. The couplers 41, 42 and 43 are arranged between the control arrangements of the individual roll stands.

The longitudinal force controller 29 and the coupler 41 are connected to an addition point 50 , which is located on the output side of the speed controller 33 . The coupler 41 is also connected to an addition point 51 which has the signals from the longitudinal force controller 30 and the coupler 42 applied to it on the input side and is connected to the speed controller 34 on the output side.

The coupler 42 is also connected to an addition point 52 , to which the signals from the longitudinal force controller 39 and coupler 43 are fed on the input side and which is connected to the speed controller 48 on the output side. The coupler 43 is also connected to an addition point 53 , which receives the signal of the longitudinal force controller 40 on the input side and which acts on the speed controller 49 on the output side.

The insertion of these couplers 41, 42, 43 between the control arrangements assigned to the individual roll stands 1, 2, 35, 36 is not absolutely necessary, but does contribute to improving the control behavior of the overall system. If an inadmissible longitudinal force occurs between two roll stands, for example between the roll stands 35 and 36 , the speed of the rolls of these roll stands 35 and 36 would be changed in the absence of the couplers 41, 42, 43 so that the prescribed longitudinal force between the stands 35 and 36 results, however, there would be an inadmissible longitudinal force between the further rolling stands 1 and 2 or between 2 and 35 as a result.

This would have the consequence that the speeds of these roll stands would also have to be changed, which, however, has a retrospective influence on the already set speeds of the roll stands 35 and 36 . Up to the setting of the prescribed longitudinal force between all stands, a large number of control processes would take place, which has the disadvantage that the rolling stock 5 could not be rolled optimally, ie with the prescribed longitudinal force, during this settling period.

This disadvantage is eliminated by inserting the coupling elements 41, 42, 43 . If, for example, an inadmissible longitudinal force occurs between the roll stands 35 and 36 , not only will the speeds of the roll stands 35 and 36 be changed accordingly, but at the same time the speeds of all the stands in front of the roll stand 35 will be - via the coupling members 41, 42, 43 adjusted so that there is no impermissible longitudinal force.

At the indicated in Figs. 3 and 4 effect direction between the summation points 44, 45, 46, 47 and the couplers 41, 42, 43 (Fig. 3) and between the summation points 50, 51, 52, 53 and the couplers 41, 42, 43 ( FIG. 4), a change in tensile force between two roll stands is communicated to all controllers of the roll stands in front, ie the speeds of all roll stands in front are changed. However, a reversal of this direction of action is conceivable in such a way that a change in tensile force between two roll stands is communicated to all controllers of the subsequent roll stands, ie the speeds of all subsequent roll stands are then changed.

Claims (14)

1. Method for controlling the longitudinal force in a rolling stock between rolling stands of a continuous rolling train with individual drives, the speed of the rolling stock being measured at the outlet side of a rolling stand and used to form a mathematical linkage value, which in turn is based on the change in the speed of the rolls of the one stand the longitudinal force remains constant, the mathematical linkage value being additionally corrected as a function of cross-sectional changes in the rolling stock, characterized in that the peripheral speed or the speed of the roll of the one rolling stand is measured and used to form the mathematical linkage value and that the cross-section changes in the rolling stock by forming the stitch decrease δ according to the formula (where ν = 1, 2, 3,... = No. of the respective mill stand)
are determined, where v _{ν represents} the speed of the rolling stock at the outlet from the roll and v _{ν -1 represents} the speed of the rolling stock at the inlet into the roll of the roll stand ν . 2. The method according to claim 1, characterized in that the lead as the mathematical logic value is used, where v represents the speed of the rolling stock on the outlet side of the roll stand and v _u the peripheral speed of the roll of this roll stand. 3. The method according to claim 1, characterized in that as the mathematical logic value the difference from the speed of the rolling stock on the outlet side of the roll stand and the peripheral speed the roll of this roll stand is used. 4. The method according to claim 1, characterized in that as the mathematical logic value the quotient from the speed of the rolling stock on the outlet side of the roll stand and the peripheral speed of the roll this Roll stand is used. 5. The method according to any one of claims 1 to 4, characterized in that for a given drive speed ( s) for a roll stand, a roll is selected with a diameter such that the roll peripheral speed (Vu) in the period before the rolling stock enters the roll stand ( 1 or 2 ) and the speed of the rolling stock (v) on the outlet side of the roll stand form the mathematical link value. 6. The method according to any one of claims 1 to 5, characterized characterized that the mathematical logic value in the period before the rolling stock comes in the subsequent rolling stand was formed and saved and as a setpoint for the subsequent control during of the entire pass of the rolling stock. 7. The method according to claim 6, characterized in that that the stored mathematical logic value is changed by a certain amount that a predetermined Longitudinal force corresponds. 8. The method according to claims 5, 6 and / or 7, characterized in that during the entire run of the rolling stock in the event of deviations in the mathematical Linking value from the stored setpoint the speed the rolls of the individual roll stands with each other be adjusted so that the stored setpoint results. 9. The method according to any one of claims 1 to 8, characterized g indicates that the speeds of the rollers of the individual roll stands through a superimposed advance control and a subordinate rolling stock speed control be adjusted so that at the outlet of the Rolled goods from a roll have a prescribed speed value of the rolling stock.   10. Circuit arrangement for carrying out the method according to one or more of the preceding claims, characterized in that a pre-actual value generator ( 21, 22 ) of a roll stand ( 1, 2 ) on the input side a speed signal (n ₁, n ₂ ) of the roller and an exit speed signal (v ₁, v ₂ ) of the rolling stock are supplied, the advance value generator ( 21, 22 ) on the output side having a memory ( 23, 24 ) and an addition point ( 25, 26 ) that the memory ( 23, 24 ) via a Leading setpoint generator ( 27, 28 ) is connected to the addition point ( 25, 26 ) that the addition point ( 25, 26 ) is on the output side via a longitudinal force controller ( 29, 30 ) on a speed controller ( 19, 20 ), whereby a Speed control of the drive motor ( 6, 7 ) of the roller takes place. 11. Circuit arrangement according to claim 10, characterized in that the output of the longitudinal force controller ( 29, 30 ) is connected to a speed controller ( 33, 34 ), the speed controller ( 33, 34 ) on the input side further with the exit speed signal (v ₁ , v ₂ ) of the rolling stock and the output side of the speed controller ( 19, 20 ). 12. Circuit arrangement according to claims 10 and / or 11, characterized in that a stitch-off-forming ( 31, 32 ) on the input side with the inlet-side and outlet-side speed signals (v ₀, v ₁; v ₁, v ₂ ) of the roller is acted upon and on the output side the advance setpoint generator ( 27, 28 ) and the memory ( 23, 24 ) are acted upon. 13. Circuit arrangement according to claims 10 and / or 12, characterized in that between the speed controller ( 19, 20, 37, 38 ) and the longitudinal force controller ( 29, 30, 39, 40 ) of each roll stand ( 1, 2, 35, 36 ) an addition point ( 44, 45, 46, 47 ) is inserted, to which signals from couplers ( 41, 42, 43 ) can be applied, these couplers ( 41, 42, 43 ) each having adjacent roll stands ( 1, 2, 35 , 36 ) connect a continuous rolling mill. 14. Circuit arrangement according to claims 10 and / or 11 and / or 12, characterized in that between the speed controller ( 33, 34, 48, 49 ) and the longitudinal force controller ( 29, 30, 39, 40 ) of each roll stand ( 1, 2, 35, 36 ) an addition point ( 50, 51, 52, 53 ) is inserted, to which signals from couplers ( 41, 42, 43 ) can be applied, these couplers ( 41, 42, 43 ) each having adjacent roll stands ( 1 , 2, 35, 36 ) of a continuous rolling mill.