WO2013110399A1 - Method for processing rolling stock in a hot-rolling mill - Google Patents

Description

description

The invention relates to a method for processing of rolling stock in a hot rolling mill

Rolling stock in a hot rolling mill with a rolling mill with at least two consecutive rolling stands.

In hot rolling in a hot rolling mill, a rolling stock, e.g. Steel or various metals in the form of so-called slabs or cast strands, heated in an oven to a temperature above the respective recrystallization temperature. The hot slab then passes through a rolling mill with several rolling mills, in which it is rolled into ribbons or slabs in several passes. For each pass, the rolling stock is to be rolled to a specific target thickness.

In order to obtain the desired target thickness on each roll stand, the roll gaps on the roll stands must be suitably adjusted. This is done with the aid of Anstell systems, which usually adjust the upper set of rolls with respect to the pass line of the rolling mill. The adjustment systems are e.g. operated with hydraulic cylinders or electromechanical screws or a combination of both.

The nominal values for the roll nip are usually specified from a pass schedule, which is calculated from a model of the rolling train or selected from a list. Before the roughing of the rolling stock, ie the impact of the rolling stock on the roll stand or the roll, the roll gaps are set to the corresponding set values. After the initial cut, a load roll gap controller, a so-called Gaugemeter, calculates the current roll gap taking into account the position of the positioning system, the forces and the framework parameters. If the current gap and target value of the roll gap deviate from one another, the load roll gap controller regulates the roll gap and thus the rolling stock thickness on the basis of its framework model. An improved way to control the roll gap is to use a mass flow controller. The default setting of the roll gap is as above based on a stitch plan. At each rolling stand Wi, the rolling stock enters at a certain inlet-pickled rolling stock speed v and inlet-silted rolling stock thickness hi_i, and leaves the rolling stand with an outlet-silting rolling stock speed v ± and effluent-silted stock thickness hi. The mass flow law applies to every rolling mill:

By measuring the inlet and outlet wet rolling speeds and the inlet-soaking rolling stock thicknesses, the current outlet-side rolling stock thickness can be determined. The calculated outflow-side rolling stock thickness is then regulated by the mass flow controller to its target thickness, a target outflow thickness hi, _So ii. The mass flow controller acts on the Anstellsystem of the respective rolling mill and thus replaced in principle the Lastwalzspaltspaltregler, which, however, additional borrowed can be maintained.

The inlet-side rolling stock thickness h ₀ on the first rolling stand is determined from a known initial value, for example a thickness measurement in the roughing mill or from a constant value in a slab. For the respective downstream rolling stands, a renewed thickness measurement can be carried out or the outlet side rolling stock thickness of the preceding rolling stand can be used. The measurement of the rolling stock speeds v, can for example take place via a direct measurement on the rolling stock with a rolling stock speed measuring device. In this case, it is measured with which speed the rolling stock passes a fixed location or a checkpoint of the rolling train. For this purpose, for example, laser or pulser on rollers with Walzgutkontakt known . Another possibility would be to determine the speed over the time required for a certain rolling stock section, eg the head of the rolling stock, to travel a set distance, for example between two rolling stands.

At the beginning of a rolling process, however, no measured values are available and even during processing it is often difficult to measure the process parameters, in particular the rolling stock speeds _x , with sufficient reliability. Therefore, any necessary adaptation or optimization of the process parameters is possible only after some time. The object of the invention is to provide an improved method for processing rolling stock in a hot rolling mill, in which the above-mentioned disadvantages are avoided.

According to the invention the object is achieved by a method having the features of claim 1.

The processing of rolling stock in a hot rolling mill with a rolling mill comprising at least two successive rolling stands, each stand Wi having at least one roll driven by a rolling drive at a roll speed v _Wl and the rolling stock from the rolling stand Wi with a maturation seizure Walzgutgeschwindigkeit Vi, via an overfeed s, with the roller speed v _Hi related exits, takes place with the following steps:

In a first step a) outgoing side target thickness hi of the rolling stock for each rolling stand Wi are specified. These setpoint values for the auslaufseifigen Walzgutdicken hi, _So n are determined using a model for the machining process in the hot rolling mill model or taken from a stitch plan or a list. In a second step b) setpoint values for the outlet-side rolling speeds i _(So n are ascertained in accordance with the mass flow law from the outlet-side target thicknesses hi This again takes place with the aid of a model or a pass plan.

Subsequently, a model value for the lead si is selected in step c). The modeled lead s, is intended to simulate the real overfeed as accurately as possible and is calculated by a rolling mill model or taken from a list.

In the next step d), setpoint values for the roll speeds v _W i, _So n are determined from the model value of the lead-in si and the target values of the outlet-side rolling stock speeds Vi, s _o ii.

In a last step e), the roller speeds v _W i are adjusted to the setpoint values for the roller speeds v _Wl , s _o ii. This results in the desired outfeed-side rolling speeds Vi, _3o n. By specifying and adhering to the outlet-side rolling material speeds or the outlet-side belt speeds, the outlet-side rolling stock thicknesses hi and thus the required target thicknesses hi after the individual rolling stands Wi set with high accuracy.

The invention is based on the recognition that the roller speed v _Wl can be calculated from the outlet-side rolling material speed Vi and the associated overfeed s ± as follows:

^{Vm =} (Ϊ)

In a rolling process, the rolling stock is to be rolled to a specific target thickness hi. For this purpose, it is necessary that the respective target thickness hi after the individual rolling Prepare Wi. In other words, a target thickness hi is specified after the last rolling stand Wi, and based on a model, the remaining target thicknesses hi, namely those for the individual rolling stands Wi of the rolling train, are determined and thus likewise predetermined. The target thickness hi is therefore to be understood as the thickness with which the rolling stock is to leave the rolling stand Wi. From these target thicknesses hi or so that they are adjusted according to the respective rolling stands, the associated outward-side rolling stock speeds v 1 are also modeled based on a model and set values for the outgoing-side rolling speeds Vi, _B on are determined. The basis for these model-based calculations is the mass flow law. Also, the associated lead s, is determined by a model in such a way that it corresponds as closely as possible to the real lead. The lead s, is very low, experience has shown that it is in the single-digit percentage range, and therefore according to the above formula has only a minor effect on the ratio of expiring Walzgutgeschwindigkeit Vi and roller speed v _Wl . It is therefore sufficient to set the lead s, at the beginning of the rolling process on the basis of a model to a value or to take a list.

From the model-based values for the outlet-side rolling stock speed Vi, soii and overfeed s, are now according to the above formula setpoints for the roll speeds

v _Wl , soii determined. The roller speeds v _Wl are then adjusted to the setpoint values for the roller speeds i, soii. In other words, these setpoint values for the roller speeds v _w i, _So ii are actually set at the respective rolling stands Wi or rollers. This is done via pulse generators on the rolling drives.

An advantage of this method is that the roller speeds v _H i via pulser on the rolling drives with high accuracy. In comparison to the rolling speed vi, the roller speeds v _H i can also be measured and regulated much more simply and accurately. In addition, the outgoing side rolling speeds v, therefore, also remain approximately constant, and the target thicknesses h 1, which are established according to the mass flow law, are therefore subject to less fluctuations. This ensures that the rolling velocities v _class are calculated using model-based calculated setpoints for rolling speeds VFLI, soi i, which in turn s, calculated over a likewise model-based calculated advance, adjusted, it is also not necessary to measure the Walzgutgeschwindigkeiten v ±, which has sometimes shows as problematic. According to a preferred embodiment of the method, a mass flow controller is used which hi the target thickness hi from the measured values for the inlet side rolling material speed v _{0 (M} , the inlet side rolling stock thickness h ₀ , _M and the roller speed v _{wi of} the first rolling stand Wi using the lead Si adjusts.

In a further preferred variant of the method, a mass flow controller is used on each rolling stand, which adjusts the target thickness hi from the incoming silted material velocity ν, -ι, the inlet soapy stock thickness hi_i and the roll speed v «i of the rolling stand Wi using the lead Si. These mass flow controllers act on the positioning system and the roller speed _w i of the respective rolling stand Wi.

In an advantageous embodiment of the process target thickness error l \ h _± having Walzgutabschnitte be detected,

Tapping times Ί ₊ ι the Walzgutabschnitte determined in the rolling stand Wi ₊ i and at time Ti + i, the roller speed v _W i of the rolling stand Wi adjusted so that adjusts the target thickness hi ₊ i according to the mass flow law in the rolling stand W ₁₊ i. In other words, the position or position of a detected or to thin Walzgutabschnitts and determines the time Ti ₊ i, to which this hits a rolling stand Wj_ ₊ i determined. This can be determined, for example, via the rolling stock speed vi of this rolling stock section and a route, for example between two rolling stands Wi. To this

Time Ύ ₊₁ then the roller speed v _{Wl of} the previous rolling stand Wi is changed in order to restore the validity of the mass flow law on the rolling stand Wi + i. If a rolling stock section is too thick, the roller speed v _{Wl of} the preceding rolling stand Wi is reduced, but if the rolling section is too thin, it is increased. Thus, thickness errors of the rolling stock can be pre-controlled and corrected quickly. This leads to an improvement in the thickness quality, in particular in the extended head region of the rolling stock. The head of the rolled material refers to the front end of the rolling stock seen in the direction of movement.

In one possible embodiment of the method, the model value for the lead s, is set constant. As already described above, a change in the lead s, has only a small influence on the roller speed v _Wl . Therefore, in the simplest case it is sufficient to calculate the lead s ± from the model or to extract it from a list and to maintain this value during the entire machining process. The roll speeds v _Wl are then set only at the beginning of the rolling process on the basis of the calculated in the model setpoint values for the roll speeds v _Wl , _So n. In a preferred embodiment of the method, the overfeed s, model-adapted during the entire processing. For this, additional variables, such as measured values determined during the rolling process, are input into the model. As a result, it is constantly being updated and the lead determined on the basis of the repeatedly adapted model s, thus steadily refined or better adapted to the real overfeed. The modeled lead s, is formed from a base value s _G i and a correction value s _Kl after si - ^s Gi + ^s Ki. The correction value is determined here on the basis of a measured value during the rolling process.

As a starting value for the lead s _lr that is, as a basic value s _G i, can again in a known manner a corresponding

Leading value to a rolling model or a list are taken. According to the invention, the predetermined lead in the form of the basic value is determined by means of measurements - i. in the form of the correction value - corrected or fine-tuned and closer to the actual existing lead Si better. This allows the determination of a constantly updated

Lead factor. In other words, the lead is thus improved by adaptively adapting a standard value based on the measured values. In accordance with the method, therefore, there is a corrected overfeed: For example, a correction value is determined per rolling cycle in order to be used for subsequent, for example, similar rolling operations. Also in the next rolling process, a new correction value is then determined, which can then be used for the next but one rolling process. Thus, a continuous optimization and tracking of the accuracy of the advance is achieved. This has a direct effect on the accuracy of the determined roller speed v _H i and thus on the auslaufseifigen Walzgutgeschwindigkeiten vi and target thicknesses hi. In a further preferred embodiment of the method, the overfeed s, during the processing of the rolling stock, is constantly tracked on the basis of the measured value of the rolling stock speed v _{1> M.} In addition, a rolling stock speed measured value v _{1> M} behind a rolling stand Wi is determined by known measuring methods. This measured rolling stock speed v _{1> M} is measured together with the lead determined according to the invention Si processed in a further correction value s _Kl and a further corrected overrun s, determining control device with a Voreilungsadaptionsregler. In other words, the rolling speed measured value v 1, _M 2 and the overfeed s corrected in accordance with the invention enter the control device. Here, in particular, a certain weighting between the measured value and the advance value can be selected. In other words, by the

Advance adaption controller, although it uses a rolling material speed measured according to the rolling stand or between rolling stands. However, the use is made to increase the robustness of the mass flow control only indirectly, namely on the roller speed v _Kl together with the inventively determined lead O s in the control device.

In this embodiment of rolling stock speed control, an optimal compromise is achieved between robust dynamics and high stationary accuracy. The roller speed measurement via the pulse generators on the roller drives forms the dynamic components, such as, for example, Acceleration of the rolling train, speed changes due to speed corrections of the controls or load actions, robust.

The desired roller speed v _W i, _So n is set via the modeled and tracked over the control lead over factor so that adjusts the desired outlet side rolling material speed behind each rolling mill. Thus, the rolling stock speed control achieves the high dynamics of the roller speed control.

The conversion of the rolling stock to the roll speed takes place via an overfeed, which is modeled and adapted by means of a reading-filtering control. The measured actual advance or estimate determined by the advance or advance adaptation direction is a direct indication of the modeling quality of the overfeed and thus can be used ideally for the adaptation of the process models.

The adaptation of the modeled lead can also be simply limited in the controller: e.g. is in a known incorrect measurement of the rolling stock of the

Correction controller determined correction value for the lead s i frozen, i. the value of the override is retained and will not be further adjusted. This allows undisturbed further rolling in fault measurement of the rolling stock speed, in which the advance adaptation regulator is frozen, i. at the time of the incorrect measurement

 Leading factor is not further corrected, but is constantly being used. This can be done, for example, until a valid measured value is measured again. The adjustment of the lead can then be continued to obtain even more accurate lead values.

In a further advantageous embodiment of the method, the expansion of the rolling stock is taken into account in the determination of the rolling stock speeds vi and the roll speeds v _Wl . The ratio of run-in width Bi_i of the rolling stock to run-off width Bi of the rolling stock has an influence on the target thickness hi after the respective rolling stand. In other words, the target thickness hi and the ratio of inlet-sissential width Bi_i of the rolling stock to the outlet-sissential width Bi of the rolling stock are proportional to one another:

If the expansion of the rolling stock is taken into account in the method according to the invention, this takes place in the form of this correction term, which is taken into account in the mass flow law. ^ ί-ι ß; - hi = - h _i _ _l

As a result, the accuracy of Walzgut- or belt speeds, which are necessary for the required Walzgutdicken, even further increased. The spread of the rolling stock is known from a rolling model or a list.

According to a preferred embodiment form, a strip tension regulator is in each case arranged between two rolling stands Wi_i, Wi, which regulates the strip pulls i_i, i between two rolling stands via the setting of the roll gaps. The bands Z i_ i, i are detected and regulated by means of the setting system of the rolling stand Wi in each case in the rolling direction. If the strip tension _i, i, for example, too large, the nip of the following rolling stand Wi is set closer to the force on the

Rolling stock acts to increase. If the strip tension zuι_ι, ι, the roll gap is widened, so that a smaller force acts. Without such a band tension control there is an increased risk that the rolling stock breaks, too large a strip tension, or form loops in the rolling stock when the strip tension is too low.

If such a strip tension regulator is used, the strip tension or the rolling stock can be detected by means of loop levers. These move in a position-controlled manner after the roll stand Wi, which follows in the rolling direction, to a desired position above the pass line. The strip or rolling load is calculated by the force with which the rolling stock presses on the respective position-controlled loop lifter. Known methods are load cells or indirect calculations on the restoring forces of the sling lifter control. From the time at which the ski lift gets Walzgutkontakt, the Walzgutzugregelung is active on the Anstellsystem of rolling mill stand Wi in the rolling direction. Advantageous in the use of loop lifters for the detection of strip tension is that these are already present in the rolling mill and only position-controlled with a fixed angle, ie static and not dynamic, must be operated. Alternatively, the complex loop lifter can be replaced by a simpler tension measuring roller, which detects the rolling stock, eg via integrated load cells. The tension measuring roller is advantageously designed to be retractable: For threading, it lies in an end position below the pass line. After the mill stands in the rolling stock direction, it is moved far enough over the pass line to ensure a sufficient wrap angle for the rolling load measurement. In comparison to the loop lifter, the detection of the strip tension can be realized more cost-effectively with a tension measuring roller.

The above-described characteristics, features, and advantages of this invention, as well as the manner in which they are achieved, will become clearer and more clearly understood in connection with the following description of the embodiments, which will be described in connection with the drawings.

For a further description of the invention reference is made to the embodiments of the drawings. Each of them shows in a schematic outline sketch:

Fig. 1 shows a detail of a hot rolling mill with three successive rolling stands, Fig. 2 is a schematic representation of a control device

Fig. 1 shows a section of a hot rolling mill 2 with a rolling mill 3 with any number of successive roll stands Wi and rolls 4 for machining the rolled material 6. In Fig. 1, for example, three successive roll stands W-, represented W ₂ and W _3, which two rollers 4 exhibit. At each rolling stand Wi, the rolling stock 6, here in the form of a slab, runs with an inlet-silty material thickness hi_i and an incoming silted material velocity ν, -i, and leaves it with an outlet-silty material thickness hi and an outlet-silting material speed Vi.

The rolling stock 6 is the first roll stand W i with a ^¬ laufseifigen rolling stock thickness h ₀ and v ₀ einlaufseifigen rolling stock supplied. In each rolling stand Wi, the rolling stock 6 is to be rolled to a predetermined run-off target thickness hi, in the case of the first rolling stand Wi to a target thickness hi. Auslaufseifige Walzgutgeschwindigkeiten Vi, s _o ii are determined for each rolling mill according to the mass flow law from these effluent sifigen target thicknesses hi. According to the exemplary embodiment illustrated in FIG. 1, in a first step a) of the method according to the invention, hi, h ₂ and h _{3 of} the rolling stock for each rolling stand Wi, in this case W _x , W ₂ and W ₃ , are determined on the basis of a model predetermined and determined in a second step b) according to the Massenflussge- set setpoints for the expiring Walzgutgeschwindigkeiten i, _So ii, v ₂ , soii and ν ₃ , _5ο ιι.

In the third step c), a model value for the lead Si is selected. In a simple embodiment of this method, this model value is taken from a list or selected on the basis of a rolling model and remains constant throughout the rolling process.

According to FIG. 1, the same value s is selected for each rolling stand Wi, W ₂ and W ₃ as a model value for the lead s, and this value is kept constant during the entire rolling process. Another possibility is model-based adaptation of the model value for the lead during the rolling process, the modeled lead Si being taken from a base value s _G i, which is taken from a list or rolling model, for example, and a correction value s _Kl based on a measured value is determined. The predefined lead s _G i is thereby corrected or fine-tuned on the basis of measurements - ie in the form of the correction value s _Kl - and more closely approximated to the actually existing lead s. The accuracy can be further increased by constantly tracking this modified lead s, during the processing of the rolling stock 6, on the basis of the measured value of the rolling stock speed v _{1 (M )} The measured value for the rolling stock speed v _{1) M} is determined by means of a suitable Measuring device 18 determined.

Are from the model value for the overfeed s, and the target values for the auslaufseifigen Walzgutgeschwindigkeiten _I, n in the next process step d) is now a model-based set values for the roll speeds v _{Wl, soue,} based on the three illustrated rolling stands Wi, W ₂ and W ₃ Setpoint values for the roll speeds v _w i, s _o u, v _H2 , s _o ii and v _w3 , _So n determined.

During the machining process, the rollers 4 of a rolling stand Wi rotate at a roller speed v _vl . The roller speed v _Wl is set via a rolling drive 8. In a final step e), the rolls 4 of the rolling stands Wi, W ₂ and W _{3 are} here adjusted to the setpoint values for the _{roll speeds} v _H i, g _e n, v _w2 , _{3 o} ii and v _w3 , _So ii.

By specifying and maintaining the roll speeds v _w i, _So ii, v _W2 , so _ll and v _{w3 (S} oii are the spilling

Wal zgutgeschwindigkeiten Vi, _So n, v ₂ , s _o ii and v ₃ , _So n and thus the ausseseigen target thicknesses h _x , h ₂ and h ₃ with great accuracy. The first rolling stand Wi is associated with a mass flow controller 10. During the rolling process, measured values are recorded for the entry-side rolling material speed v ₀ , _M and the inlet-pickled rolling stock thickness h ₀ , M of the first rolling stand Wi. From these measured values and the roll speed v _{wi of} the first roll stand W _x , the mass flow controller 10 sets the target thickness hi using the lead s _x . For this purpose, controls the mass flow controller 10 via a AnstellSystem 12 of Rolling 4 and the first stand Wi, the setting of the variable roll gap. In principle, such a mass flow regulator 10, which is not shown here, can also be used on the rolling stands W ₂ and W ₃ .

Between two rolling stands Wi_i, Wi, a strip tension regulator 14 is further arranged, which controls the strip tension Zi_i, i between the two rolling stands Wi_i, Wi via the setting of the roll gaps. According to FIG. 1, a strip tension regulator 14 is arranged both between the rolling stands Wi and W ₂ and between the rolling stands W ₂ , W _3, which adjusts the strip tension Zi, ₂ or Z _2f3 via the setting of the rolling _{gaps of} the rolling stands W ₂ and W, respectively ₃ regulates.

The strip tension is detected in the illustrated embodiment via a loop lifter 16, which is operated position-controlled at a fixed angle. Alternatively, instead of the loop lifter 16 and a tension measuring roller - not shown - are used. The strip tension Ζ, -ι ,, is calculated by means of the respective force F with which the rolling stock 6 presses on the loop lifter 16. The strip tension regulator 14 regulates the strip tension Zi_i, i via the setting system 12 of the respective rolling stand W in the rolling direction.

During the processing of rolling stock 6, it may happen that it does not have the predetermined target thickness hi when leaving a rolling stand Wi and thus has a target thickness error Ah _x . Such a rolling stock section 6 is detected during the rolling process, its tapping point in time Ί \ ₊ ι in the rolling stand Wi ₊ i determined and at time Ti ₊ i, the roller speed v _{Wl of} the rolling stand Wi is adjusted so that according to the mass flow law in the rolling stand Wi ₊ i sets the target thickness hi ₊ i. In Fig. 1 by way of example a Walzgutabschnitt 6 is shown, which after the first rolling stand Wi a target thickness error Ah _l , in this case a too thick Walzgutabschnitt 6 ^Λ - shown here by a hatched area - has. This excessively thick rolling stock section 6 ^x strikes the rolling stand W ₂ at time T ₂ . To this At the time, the roller speed _w i of the first rolling stand Wi is reduced to such an extent that the correct target thickness h _{2 is} established in the rolling stand W ₂ in accordance with the law of mass flow. As already mentioned above, it is possible to constantly track the modeled lead s during the entire rolling process. FIG. 2 shows a schematic representation of a control device 20 for controlling the rolling stock speed vi via the roller speed v _W1 by means of which a continuous tracking of the modeled overfeed si takes place. The overfeed is thus tracked by adaptive adaptation of the overfeed s, on the basis of further measured values, in the exemplary embodiment according to FIG. 2 on the basis of measured values of the rolling stock speed Vi, _M. This rolling stock speed value V ,, _M is determined with a measuring device 18 behind a rolling stand Wi.

This control device 20 comprises a

 Vo lungsadaptionsregie 22 and a Limitations- and Plau- sibilisierungsstufe 24. On Walzgut 6 is using a

Measuring device 18 an actual outlet side rolling material Vi, _M measured. This outlet-side rolling material speed v _{1 (M)} , which is actually measured behind a rolling stand Wi, and the setpoint value for the outlet-side rolling speed i, _So n, are supplied to the advance adaptation controller 22. From these variables, a correction value for the advance s _{Kl is} determined.

Subsequently, this correction value for the advance s _K i is supplied together with the basic value of the lead s _{Gl to} a limitation and plausibility step 24. This results in a further corrected and again finely tuned lead si. This is then used in an inverse line model 26 to adapt the setpoint values for the roll speeds v _Wl , _So n. In other words, the model-based adjusted lead s, by the lead adaptation controller 22 and the Limitation and plausibility stage 24 again fine-tuned, in contrast, under certain circumstances, again to produce a better adapted modeled lead s s. This better adapted modeled lead s, is again used in the model to determine the setpoint values for the _{roll speeds} v _Ml , _SG ii, which are then adjusted via the rolling drives. As a result, the outlet-saturated target thicknesses hi are set with ever greater accuracy. In other words, the rolling stock speed measured value v _{1 / M} and the override s _lr corrected according to the invention, namely the basic value s _G i and the correction value s, enter the control device 20. Here, in particular, a certain weighting between the measured value, in this case the rolling stock velocity measured value v _{1> M} , and the override value si can be selected. In other words, a rolling stock speed measured according to the rolling stand Wi or between rolling stands is used by the regulating device 20. However, in order to increase the robustness of the mass flow control, it is used only indirectly, namely together with the lead s determined in accordance with the invention, in the control device 20.

Although the invention has been further illustrated and described in detail by the preferred embodiment, the invention is not limited by the disclosed examples, and other variations can be derived therefrom by those skilled in the art without departing from the scope of the invention.

Claims

claims A method of processing rolling stock (6) in a hot rolling mill (2) having a rolling line (3) comprising at least two successive rolling stands (Wi), each one Rolling stand (Wi) has at least one roller (4) driven by a rolling drive (8) with a roller speed (v _Wl ) and the rolling stock (6) from the rolling stand (Wi) with an outlet-ready rolling speed (v _x ) which is above a ne advance (si) with the roller speed (v _Wl ) depends, with the following steps: a) outgoing side target thicknesses (h _x ) of the rolling stock (6) for each rolling stand (W _x ) are given, b) according to the mass flow law from the auslaufseifigen target thicknesses _(hj.) setpoints for the auslaufseifigen Walzgutgeschwindigkeiten (i, _So n) is determined, c) providing a model value for the advance (si) is selected, d) from the model value of the advance (si) and the desired values of auslaufseifigen Rolling speeds (vi, _So ii) become set values for the roll speeds (v _wi , _So .n) is determined, e) the roll speeds (v _Wl ) are set to the setpoint values for the roll speeds (v _Wl , _So n)  adjusted. 2. The method of claim 1, wherein a mass flow controller (10) from the measured values for the inlet side rolling stock speed (v ₀ , M), the inlet side rolling stock thickness {h _0fM ) and the roller speed (v _w i) of the first rolling stand Wi using the Lead (si) sets the target thickness (hi). 3. The method of claim 1 or 2, wherein a Massenfluss- controller (10) on each rolling mill (Wj _. ) From the inlet-silty Walzgutgeschwindigkeit (ν, -ι), the einlaufseifigen Walzgutdicke (hi_i) and the roller speed (v _Kl ) of Roll stand (Wi) using the lead (s,) sets the target thickness (hi). 4. The method according to any one of the preceding claims, wherein the target thickness error (Ah _l ) having Walzgutabschnitte (6 ^λ ) recorded, tapping times of Walzgutabschnitte (6 ^r ) in Rolling stand (W ₁₊ i) are determined and at the time the roll speed (v _Wl ) of the roll stand (W _x ) is adjusted so that the target thickness (hi + i) adjusts according to the mass flow law in the rolling stand (i ₊ i). 5. The method according to any one of the preceding claims, wherein the model value for the lead (si) is set constant. 6. The method according to any one of the preceding claims, wherein the overfeed (s _x ) is adjusted model-based throughout the processing. 7. The method according to any one of the preceding claims, wherein the overfeed (si) during the processing of the rolling stock (6} is constantly tracked on the basis of the measured value of the rolling stock speed (Vi, _M ). 8. The method according to any one of the preceding claims, in which the expansion of the rolling stock (6) in the determination of the rolling speed (v,) and the roll speeds (v _w i) is taken into account. 9. The method according to any one of the preceding claims, wherein in each case between two rolling stands (W _x ) a strip tension regulator (14) is arranged, which controls the band tension (Ζ, -ι ,,) on the setting of the roll nips. 10. The method of claim 9, wherein the strip tension (i_i, i) is detected by means of a Schiingenhebers (16). 11. The method according to claim 9, wherein the strip tension (Ζι_ι, ι) is detected by means of a tension measuring roller.