DE2815341A1 - PROCEDURE AND CIRCUIT ARRANGEMENT FOR REGULATING THE LONGITUDINAL FORCE BETWEEN ROLLING STANDS OF A CONTINUOUS ROLLING MILL WITH INDIVIDUAL DRIVES - Google Patents

Description

Mp.no. 527/78 Mannheim, 6. April 1978

ZFE / P3-Pn / Ha.

"Method and circuit arrangement for regulating the longitudinal force between rolling stands of a continuous rolling mill Individual drive "

The invention relates to a method and a circuit arrangement for regulating the longitudinal force in a rolling stock between rolling stands of a continuous rolling train with individual drives .

Located in a continuous rolling mill with individual drives the rolling stock is in several roll stands at the same time and passes through them successively, with a specific one at each stand Pass decrease, i.e. a reduction of the material cross-section takes place. The individual roll stands are above the rolling stock mechanically coupled with each other. The speeds of the drives of the roll stands must be coordinated so that that no tensile or compressive forces arise in the rolling stock, or that a specified tensile or compressive force is maintained So once given longitudinal forces during the passage of the

9098A2 / 0273

Rolling material are preserved, whereby these longitudinal forces have a certain

may have the correct value or the value IJuIl. i

; In the case of thin rolled stock, freedom from tension and pressure is intentionally achieved Causes the formation of a loop of rolling stock between two roll stands. A loop control adjusts the speed of the roll stands so that the loop training is retained. However, this is no longer possible with larger material cross-sections.

■ Excessive pressure in the rolling stock leads to a lateral _training: breaking of the material. Too much tension leads to a constriction of the material and disadvantageously results in cross-sectional tolerances that are too large.

A well-known "synchronization device for multi-motor drives a continuous rolling mill "(DE-PS 1 201 466) sets in with the entry of the rolling stock into the rolling stands at this moment a rotational speed structure free of longitudinal forces between the scaffolding,

\ where the reference value for the freedom from longitudinal forces in the rolled stock is | ^: the armature currents of the respective drives are used.

Another well-known "device for mutual coordination the drive speeds of a multi-stand rolling mill with individual drives "(DE-AS 2 413 492) uses changes to the

■ Drive torque on the already threaded frame as a measure for j the longitudinal forces in the rolling stock.

In these known devices it is disadvantageous that the speed structure of the rolling train, once set, is not changed if, due to disturbance variables, for example deviations in material cross-section at the inlet, longitudinal forces occur during the passage of the rolling stock. In particular, the reference values depend on the current or,

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909842/0273

Drive torque - viewed over longer periods of time - too much from the temperature of the rolling stock to be used as a measure for

a longitudinal force control over the entire cycle period ^; of the rolling stock could serve. ;

For this reason, according to a further known "method for the regulation of continuously working roller mills " (DE-AS 1 279 589) is the quotient of the rolling torque to the roller compressive force Suggested as a reference value for a temperature-independent longitudinal force control. ,

The disadvantage of this known method, however, is that the measurement of the roller pressure force is very complex and expensive It is difficult to convert existing systems to it. In addition, the quotient of the rolling torque to the roll compressive force is determined by Material cross-section deviations changed, so that this quotient is only used to a limited extent as a measure for a longitudinal force control can be.

The invention is based on the object of a method for regulating the longitudinal force between rolling stands of a continuous one To develop rolling train with individual drives, with the help of which the speeds of the rolling stands among each other during the entire rolling stock can be coordinated so that no or a defined constant longitudinal force between the Scaffolding occurs.

Another object of the invention is to provide a circuit arrangement to develop this procedure.

According to the invention, this object is achieved in that the speed of the rolling stock on the outlet side of a rolling stand and the peripheral speed or the rotational speed of the

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9 0 9 8 Ä 2/0 2 7 3

.Roll of this roll stand are measured and a mathematical Linking value from these two - values as; Reference value used to regulate a specified longitudinal force will.

The advance

^v u

can be used, where ν is the speed of the rolling stock at the outlet side of the roll stand and ν is the peripheral speed the roll of this roll stand represents-v ». '

Furthermore, the difference from the speed of the VJaIzc'Utes on the outlet side of the Roll stand and the peripheral speed of the roll of this roll stand are used.

Furthermore, the quotient is off as a mathematical linkage value the speed of the rolling stock on the exit side of the roll stand and the peripheral speed of the roll of this roll stand usable.

Advantageous further developments of the invention and the circuit arrangements for carrying out the method are set out in the subclaims specified. .

The advantages associated with the invention exist in particular in that the rolling stock is independent of temperature and material cross-section on a given longitudinal force between the roll stands during the whole; Pass s through the rolling mill can be regulated. This advantageously results in small cross-sectional tolerances in the rolling stock.

■ - ■ '- ■ "" ■■ - ■.' ■. ■■. '■ - 12 -

909842/0273

The method according to the invention and exemplary embodiments in this regard are explained below with reference to the drawings. Show it:

! 1 shows a circuit arrangement according to the invention for regulating the longitudinal force,

2 'shows an alternative circuit arrangement to this.

Fig. 3 and

4 possibilities of coupling between the individual roll stand control arrangements.

In Fig. 1, a circuit arrangement according to the invention is for Regulation of the longitudinal force between rolling stands in a continuous Rolling train shown with individual drives - From the rolling train even here, for example, two roll stands 1 and 2 with individual drives 3 and 4 are shown. The rolling mill can be any have many other roll stands.

The rolling stock 5 passes through the individual roll stands 1 or 2, with a material cross-section in each roll stand 1 or 2

'Reduction and a run-out speed' increase. The material cross-sections of the Pialzgutes 5 in front of the roll stand 1, after the roll stand 1 and after the roll stand 2 are Aq, A ^ and Α- denotes. The exit speeds of the rolling stock 5 in front of the roll stand 1, after the roll stand 1 and after the roll stand

_: arm 2 are denoted by Vq, v-, and V ₂ .

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

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909842/027 3

The current converters 12 and 13 are each connected to current regulators 17 and 18, the current signals I and I being fed to "the current regulators: 17 and 18 with a negative sign." 20, with a negative supply of the corresponding signals - here speed signals η, b-tu. Η - also taking place.

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

The speed signals η- and n "also act on the lead actual value generator 21 and 22. These actual value generators 21 and 22 are also inputted with speed signals v · and V2 from the speed measuring devices 15 and 16, respectively. The signals °° · are on the output side. , or ^ - ■ , ~ the actual value generator 21 or 22 stores 23 and 24 respectively. Furthermore, the output signals x ·. or ^ c. the actual value generator 21 or 22 in a negated manner at addition points 25 and 26, respectively.

The memories 23 and 24 are on the output side with advance command value generators 27 and 28 connected. The output signals χ ,,, or ^ c 11 7 this setpoint generator 27 and 28 act on the Addition points 25 and 26. The setpoint generators 27, 28 each have a further input for correcting the input signals on .

The output signals of the addition points 25 and 26 are longitudinal force controllers 2 9 or 3 0 supplied. The output values of the longitudinal force controller 29 and 30 are connected to the inputs of the speed controller and 20.

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

9 0984 2/027 3 ■

In the method according to the invention and the circuit arrangements for this purpose, the lead cc is used as a reference variable for a longitudinal force control. The lead ¹ X- itself is calculated from the two variables of the exit speed ν of the rolling stock 5 behind a roll stand 1 or 2 and the roller circumferential speed ν of the roll itself and is defined as:

CC = ^ ~ uV , where

^v uV
V = 1, 2, 3 ...

v _v = s run-out speed of the rolling stock 5, e.g. v-,, V ₂ , ···

V = roller peripheral speed of the roller of the individual drive, _{e.g. v ul} , v u2, ...

Other possible definitions of the lead are

- ^v uv

or

• x =

^v uv

Why the lead x. can be used as a measure of the longitudinal force, is explained below. When the rolling stock 5 runs through the rolling train, the law of volume-

, constant for the rolling stock 5, ie during a certain point in time t = t "is the product of the run-out speed v _y

'■ and the material cross-section Ay constant at every point of the rolled stock (where ^ = I, 2, 3 ...), so

v, · A. = v "· A ~ = V-. * A, = Vy · Ay = constant.

For example, if the rotational speed n, of the rolling stand 1 is too small, contact longitudinal forces imWalzgut 5 on which the rolled stock with ^5: Pull larger overfeed X Tialzgerüst from 1, and there the

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j Material cross-section of the rolling stock 5 according to the law of .Volume

j constancy: constrict. As a result, the ! Position GC- for tensile forces between two roll stands, vice versa - it decreases with pressure forces between two roll stands,

The roller circumferential speed ν is determined from the speeds n _{v of} the individual drives determined by the tachometer generators 8 and 9; to

ry = radius of the roller of the individual drive ny = speed of the individual drive.

For the method according to the invention or the circuit arrangements for this purpose, it is unimportant at which point on the roller the circumferential speed v _{uV is} determined or via the speed n _y , 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 rollers for which the specification. If a clear circumferential roll speed v _{u is} not possible or is only possible with difficulty, the radius r of the roll of the individual drive can be chosen so that the same values for the circumferential speed of the roll and the exit speed of the rolling stock are obtained in the period before the rolling stock enters the subsequent roll stand result from this roller. This procedure is of course also possible with non-calibrated rolls.

The outlet speed Vy of the rolling stock 5 is through the Speed measuring devices 14, 15, 16 determined. As an exact Speed measuring device can, for example, be a contactless one Laser speed measuring device or a non-contact one Find correlation speed measuring device application.

:; __. ■ '■ "■■■". "." -:. - - 16 -; V ν-909842/0273

A laser speed measuring device is, for example, under the name Laser-Velemeter der Meßmetallurgie, 5802 Wetter (Ruhr), ^ riedrichstrasse 40 known. The measurement of the speed is ■ follows according to the difference Doppler method, i.e. it becomes : exploited the Dopller effect caused by moving material.

A correlation speed meter 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 of optical intercorrelation. It is assumed that the surface of a product has irregularities that can be identified by an optical System can be recorded and evaluated, i.e. the characteristics of the natural radiation of the moving rolled material can be used for speed measurement.

i The formation of the actual values of the lead oc 'or ^ C- .

is 1 is 2

takes place by the lead actual value generator 21 or 22 from the • input speed signals η ^ or n ₂ and the input. Exit speed signals V ₁ and V ₂ . In the actual value generator 21 and 22, the actual values of the lead "X. And ^.

is 1 is 2, for example from the formula

¹ ~~> = ^Vv - ^V u v (Υ = 1,2.-),

^v uv

I calculated.

The actual values of the advance ^; - + ι or 3C formed for the period before the rolling stock 5 enters the subsequent roll stands. are fed to the memories 23 and 24 and are used

IS u Z

then for further regulation of the longitudinal forces in the rolling stock. 5 during

90 9842/0273

. ■ - ι ! A ! IH ■ · ■ "-." U!

of the entire passage of the rolling stock 5 through the rolling train as setpoint values; the advance De _should or X _{g χι} .

¹ For this purpose, the memories 23 and 24 transmit this fourth in the lead X to the setpoint generators 27 and 28, with the! Setpoint generators ^ 27 or 28 added certain correction amounts; that correspond to a given longitudinal force. ¹ In addition parts 25 and 2.6, the differences between [the setpoints and the respective actual values of the lead ^ c ^ _t and-> £. , formed and fed to the longitudinal force regulators 29 and 30, respectively, the stored values for the lead 3C can also be fed directly from the memories 23 and 24 to the addition points 25 and 26, if rolling is to be carried out without longitudinal force. ;. ".". _: _. ". ■ .-." ■ --'--: '-

. The longitudinal force controllers 29 and 30 and the downstream speed controllers 19 and 20 convert the changes in advance into speed changes, ie a change in the speed quotient ηj7n £ is effected. For this purpose, the speed - -i regulators .19 or 20 in addition to the correction signals of the longitudinal force regulator 29 or 30, the speeds n- ^ or n ₂ in a negated way. - '-_ ■ .ν-' . '.: _ ■ / "_ ^: -: - ''.-''_' ^:

I The output signals of the speed controllers 19 and 20 act on downstream current controllers 17 and 18. The current controllers 17 and.; s control the flow converters 10 and 11 depending on the flowing motor currents I ₁ , 1 ₂ and the output signals of the speed controller 19 and 20, respectively.

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SÖ9842 / Ö273

The circuit arrangement according to FIG. 1, expanded by the components and connections shown in dashed lines, is shown below

; considered. The speed _{signals V 0} and v of the speed measuring devices 14 and 15 are fed to a stitch reduction generator 31, while the speed signals ν and v ~ of the speed measuring devices 15 and 16 act on a stitch reduction generator 32. On the output side, these stitch reduction formers 31 i> sw. 32 is connected to the memories 23 and 24 and the lead setpoint formers 27 and 28, respectively. The further circuit arrangement already described according to FIG. 1 remains unchanged.

By inserting stitch decrease formers 31 and 32, the Fact taken into account that the advance χ of the material cross-section of the incoming Ualzgutes 5 is dependent, i.e. changes in the material cross-section are recorded that occur during ■ the passage of the Ualzgutes 5 occur through the rolling train . and these changes in the material cross-section are reflected in the Regulation included.

to

'The stitch decrease σ is defined

! Vi

j where _v = 1,2, 3 ....

: Due to the already mentioned constant volume, the Stitch decrease / * also formulate to

The stitch decrease is therefore based on the speeds of the Ualzgood at the inlet into the and'at the outlet from the Ualze.

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909842/0273

The stitch decrease O ^ is calculated by the stitch decrease formers 31 and. _{For this purpose, the speed signals v Q} and V ₁ are applied to the stitch decrease generator 31, the speed signals v and v- to the stitch decrease generator 32 on the input side.

The pass decrease & y is fed to the corresponding storage device 23 or 24 in the period before the rolling stock 5 enters the respective subsequent roll stand. A change in the pass decrease S while the rolling stock 5 is running through the rolling train is transmitted directly to the advance setpoint generator 27 and 28, respectively. In this way, ie by correcting the advance value X which is dependent on the stitch decrease, the disruptive influence of the stitch decrease E _{on the advance OC ß,} which is used as a measure for the longitudinal force, is eliminated. - ·.

Another possibility of including a change in the material cross-section of the rolling stock 5 in the longitudinal force control is the direct measurement of the material cross-section of the rolling stock 5 at _{: the} respective entry into a rolling stand 1 or 2.Since during the rolling process, changes in cross-section preferably result in a change in the length of a dimension make noticeable of the rolling stock 5, the material cross-section can be inferred by contactless and continuous milling of this length. So-called diode line cameras, for example, are suitable for measuring the length of a dimension of the rolling stock 5.

Furthermore, other generally known methods can be used to determine changes in cross-section of the rolling stock. for example the eddy current method can be used.

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909842/0273

In Fig. 2 is an alternative circuit arrangement for regulation the longitudinal force between rolling stands of a continuous

¹ rolling mill shown with individual drives. In contrast to the arrangement according to FIG. 1, the output values of the longitudinal force controllers 29 and 30 are not directly at the inputs of the speed controllers 19 and 20, but are fed to speed controllers 33 and 34, respectively. On the input side, the speed

■ regulate 33 and 34 furthermore the speed signals v or Vy in negated form. On the output side, the speed controllers 33 and 34 act on the speed controllers 19 and 20, respectively.

¹ The further wiring of the arrangement according to Fig. 2 is as below; Fig. 1 described. In particular, even when the control arrangement j acc. Fig. 2 is an optional correction of the advance on the χ 'pass reduction formers 31 or (shown in phantom) 32 possible.

i By using the speed controllers 33 and 34, I the speeds n- or n ~ of the roll stands 1 and 2 not only \ as a function of the lead χ, but also as a function of the exit-side speeds v or v " of the rolling stock 5 'regulated. The speeds n- or n ~ are adjusted in such a way that • the prescribed; Set speed values V ₁ or v _o . The speed

I J- ^

· 'Setpoint for the roll stand 1 is, for example, through ! a superimposed lead control formed in such a way that the ge. measured and shortly before the entry of the rolling stock 5 into the downstream ! following roll stand 2 stored lead value 5C to a

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909842/0273

Value is controlled, which is a given longitudinal force between ^!

the roll stand 1 and the subsequent roll stand 2 corresponds. j

This lead value can be used in the case of changing stub down |

took ο corrected. The same applies mutatis mutandis to the. · Additional roll stands 2 and the following, so that after passage of the rolled stock 5 small throughout the entire rolling mill Qüerschnitts-

j tolerances of the rolling stock 5 result. ■.:

In FIGS. 3 and 4, possibilities of coupling between] r individual scales control arrangements are shown with one another; Circuit arrangement according to FIG. 1 and FIG. 4 a coupling possibility for the circuit arrangement according to FIG

In Fig. 3 there is a continuous rolling train with the rolling stands 1 and 2 and further roll stands 35 and 36 are shown.

j Each roll stand has the one described in detail under FIG

j control arrangement. Of these rule arrangements are for the sake of simplicity only the speed controller 19, 20 and further j speed controller 37, 38 and the Lähgskraft controller 29, 30 and

j further longitudinal force controllers 39 , 40 are shown.

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

In detail, the output signal of the longitudinal force controller is 29 an addition part 44 · supplied, the input side further with the coupler 41 and on the output side. with the speed controller 19 connected is.

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"• ■. ■ 90 9842 / 0-27-3" -

. /IT-.T '4 F i tr> /': COG Kl. J

The coupler 41 is also located at an addition point 45 which j on the input side with signals from the longitudinal force controller 30 and from the I. Coupler 42 is acted upon and on the output side at the speed

{controller 20 is located. :

i!

j The coupler 42 is connected to an addition point 46 which;

j the output values from longitudinal force controller 39 and coupler 43 are assigned

! leads and which act on the speed controller 37 itself. '

; The coupler 43 is connected to an addition point 47 which -

j on the input side of the longitudinal force controller 40 and on the output side of the ■

I speed controller 38 applied. . '\

! In Fig. 4 is a coupling option between the individual
: Roll stand control arrangements shown in FIG. 2.
; In contrast to the arrangement shown in FIG
^: Addition points between the longitudinal force regulator and the speed regulator.

! In detail in Fig. 4, the roll stands 1, 2, 35 and 36 and
ι the speed associated with their control arrangements
^! speed controller 33, 34, 48 and 49 as well as the longitudinal force controller 29, 30,; 39 and 40 shown. The other circuitry, not shown
; is as described under FIG. 2. Between the rules
Couplers 41, 42 and 43 are attached to the individual roll stands.

I arrange-!

j The longitudinal force controller 29 and the coupler 41 are equipped with a:

ι addition point 50 connected, the output side at the speed. • speed controller 33 is. The coupler 41 is furthermore with a
, Addition point 51 connected, the input side the signals
^; of longitudinal force controller 30 and coupler 42 are present and the output side is connected to speed controller 34. j ι '

; r

- 23 - ί

909842/0273

The coupler 42 is also connected to an addition point 52, the input side the signals from longitudinal force Reglej and coupler 43 are supplied and the output side at the device

j speed regulator 48 is located. The coupler 43 is also connected to an addition point 53 which has the

The signal from the longitudinal force controller 40 is present and the!

the speed controller 49 is applied. |

The insertion of these couplers 41, 42, 43 between the ■

the individual roll stands 1, 2, 35, 36 associated Regelan- \ orders is not absolutely necessary, but contributes to the encryption! improvement of the control behavior of the entire system. If an impermissible longitudinal force occurs between two roll stands,; 'For example, between the roll stands 35 and 36, would at; If the couplers 41, 42, 43 are absent, the speeds of the rolls of these roll stands 35 and 36 are changed so that the 'prescribed longitudinal force between the stands 35 and 36 results, but this would result in an impermissible longitudinal force

■ between the other roll stands 1 and 2 or, between 2 and 35 result.

This would have the consequence that the speeds of these roll stands ! would have to be changed, but this in turn has a retroactive effect on the rotational speeds of the roll stands 35 and 36 that have already been regulated f has influence. Until the prescribed longitudinal force is set.

A multitude of rules would exist between all scaffolding went to play what the Kachteil brings with it, that the rolling stock 5 not optimal during this settling period, i.e.; ! with the prescribed longitudinal force, could be rolled. i

I ι I

'By inserting the coupling members 41, 42, 43 this disadvantage 'eliminated. If, for example, an impermissible longitudinal -

■ force between the roll stands 35 and 36, then \

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9098Λ2 / 0273

only the speeds of the roll stands 35 and 36 changed accordingly, but at the same time also - via the coupling links 41, 42, 43 - the speeds of all stands in front of the roll stand 35 adjusted so that there is no inadmissible longitudinal force.

Eei in the direction of action indicated in FIGS. 3 and 4 between the addition points 44, 45, 46, 47! And the couplers 41, 42, 43 (FIG. 3) and between the addition points 50, 51, 52, 53 and the couplers 41, 42, 43 (FIG. 4), there is thus a change in tensile force

■ between two roll stands all controllers of the one in front Roll stands communicated, i.e. the speeds of all preceding roll stands are changed. However, it is a reversal

ι this direction of action conceivable in such a way that a change in tensile force between two roll stands all controllers of the following Roll stands is communicated, i.e. the speeds of all subsequent roll stands are then changed.

909842/0273

Claims (1)

, =: ·, -: ·. '. "■'·." : ·: Ί '. C: · "· ν, TiKf ₁ IGlSLlLSCi ';, FV Mp.no. 527/78 Mannheim, April 6, 1978 ZFE / P3-Pn / Ha. Claims (1,! Procedure for regulating the longitudinal force in a rolling stock between rolling stands of a continuous rolling train with individual drives, d a d u r c h g e k e η η ζ ei c h η e t, that the speed of the rolling stock on the outlet side
of a roll stand and the peripheral speed or the The speed of the roll of this roll stand can be measured and a mathematical link value from these two values is used as a reference variable for regulating a given longitudinal force. 2. The method according to claim 1, characterized in that as mathematical link value the lead v - v
X = _u ^v u .Is used, where ν is the speed of the rolling stock 909842/0273 on the outlet side of the Vialzgerüstes and v _u the circumferential ^! represent the speed of the roll of this roll stand. j ! j • I ; 3. Method according to claim 1, characterized in that as: mathematical link value the difference from the ge; '' speed of the rolling stock on the outlet side of the rolling mill ^: ; rüstes and the peripheral speed of the roll of this rolling | armor is used. 4. The method according to claim I _1, characterized in that as
mathematical linking value of the quotient of the speed of the rolling stock on the outlet side of the rolling stand and the circumferential speed of the roll of this rolling ^: scaffolding is used. 5. The method according to one or more of the preceding claims,
'characterized in that for the formation of the mathematical j link value of the radius of the roller is chosen so that
; in the side area before the rolling stand enters the subsequent roll stand at a given speed of this roll
a roller circumferential speed results, the value of which is equal the speed of the rolling stock on the outlet side of this
; Roller is I - 09842/0273 6. Verfahrea according to one or more of the preceding claims; characterized in that the mathematical linkage ^ -. ' · {--_ ■. value in the period before the rolling stock enters the downstream ; the following roll stand is formed and stored and as a sol i ■ "■ - - ^: """ - "" ■ ^; ■ "-""""■ - - ■ - ■ ^; · ; value / for the subsequent regulation during the entire period 'serves the course of the rolling stock. "" .- .. "" ^: , 7, method according to claim 6, characterized in that the 'stored mathematical linkage value is changed by a certain amount which corresponds / corresponds to a predetermined longitudinal force. - "■""" -.-- ■. . .- "." . ".-.- .." ■ ---- "" - " ^: ." ■ -: 8. Procedure according to the. Claims 5, 6 and / or 7, 'thereby marked ! indicates that during the entire passage of the rolling stock : Deviations of the mathematical link value from the actual ; stored "setpoint the speed of the rollers of each ■:.!; Roll stands are steepened with each other so that the i saved setpoint results. . -. "- ..!. i ^: ~ '- .. """■■" ■: "" ■ "■ - .--- ■ - ■ -". "_-- ■ -,. ■ -', - '■ - "-..-- '■'■" ■ -. ' .9. The method according to one or more of the preceding claims, ; characterized in that the speeds of the rollers of the; i individual roll stands by a superimposed advance control j and a subordinate rolling stock speed control so veri is that at the outlet of the rolling stock 'V. - SCS842 / O273 \: '. " sets a prescribed speed value of the rolling stock from a roller. 10. The method according to one or more of the preceding claims, characterized in that the mathematical linkage value is dependent on changes in cross-section that occur of the rolling stock is corrected. 11. The method according to claim 10, characterized in that the cross-sectional changes occurring due to the rolling stock can be determined by measurements of the speeds of the rolling stock at the entry into and at the exit from the roll. 12. The method according to claim 11, characterized in that the cross-sectional changes of the rolling stock by forming the Pass decrease according to the formula S = ^ " ^Yv -1 (where V = 1, _2/3 ...) Vy can be determined, where v _v the speed of the rolling stock ■ at the exit from the roller, Vy _{-1 the} speed of the rolling stock at the entry into the roller and S represent the decrease in stitching. 909842/0273 . '; ■ f.i ι · ·; 13. The method according to claim 10, characterized in that the ί occurring cross-sectional changes of the rolling stock by a direct Kessung a cross-section dependent size of the rolling u good can be determined at the inlet into the roller. ; 14. Circuit arrangement for carrying out the method according to one or more of the preceding claims, characterized in that a lead actual value generator (21,22) of a roll stand (1,2) on the input side a speed signal (η ,, η *) of the roll and an exit speed signal (ν ,, v ") of the rolling stock are supplied, the actual advance value forming (21,22) on the output side a memory (23, 24) and an addition point (25,26) applied that the Memory (23, 24) via a lead setpoint generator (27, 28) is connected to the addition point (25,26) that the addition point (25,26) on the output side via a longitudinal force controller (29,30) is an'einem speed controller (19,20), the Furthermore, on the input side, the speed signal (n ,, n ~) is fed to the roller and that the speed controller (19, 20) intervenes in the speed control of the drive motor (6, 7) of the roller via a current controller (17, 18), the current controller ( .17,18) a current signal (I ₁ , I ₂ ) of the drive motor (6,7) is present on the input side. 909842/0273 15. Circuit arrangement according to claim 14, characterized in that ι that the output of the longitudinal force regulator (29,30) with a Ge speed controller (33,34) is connected, the input side of the speed controller (33,34) furthermore being acted upon by the run-out speed signal (v-,, v _? ) of the rolling stock and the output side being at the speed controller (19,20). 16. Circuit arrangement according to claims 14 and / or 15, characterized in that a stitch reduction device (31, 32) is acted upon on the _{input side with inlet-side and outlet-side speed signals (Vq, v ,; v ,, V 2) of the roller} and acted upon on the output side the lead setpoint generator (27,28) and the memory (23,24). 17. Circuit arrangement according to claims 14 and / or 16, characterized characterized in that between the speed controller (19, 20, 37, 38) and longitudinal force controller (29, 30, 39, 40) of each rolling stand (1, 2, 35, 36) an addition point (44, 45, 46, 47) is inserted, which is connected to signals from couplers (41, 42, 43) can be acted upon, these couplers (41, 42, 43) each Connect adjacent roll stands (1, 2, 35, 36) of a continuous rolling train. 9 09842/0273 18 ,. Circuit arrangement according to Claims 14 and / or 15 and / or 16, characterized in thati. between speed controller (33, 34, 48, 49) and longitudinal force regulator (29, 30, 39, 40) of each roll stand (1, 2, 35, 36) an addition part (50, 51, 52, 53) is inserted, which with Signals from couplers (41, 42, 43) can be acted upon, with these couplers (41, 42, 43) each adjacent roll stands (1, 2, 35, 36) connect a continuous rolling train. 909842/0273