EP2135690A1 - Conti-mill train with integration/deintegration of roller frameworks in active operation - Google Patents

Abstract

The method involves controlling a circumferential speed (vU'') of a working roll (3'') of a roll stand (1'') up to a complete release such that coasting speed of a rolling good (2) produced by rolling of the rolling good into the roll stand corresponds to a predetermined reference coasting speed. The roll stand is controlled after complete release under retention of a correspondence of the circumferential speed of the working roll with the reference coasting speed such that the working roll of the roll stand is raised from the rolling good, and the roll stand is set in a quiescent condition. Independent claims are also included for the following: (1) a computer program including instructions for performing a method for operating a conti-rolling train (2) a data carrier for performing a method for operating a conti-rolling train (3) a control device for a conti-rolling train (4) a conti-rolling train.

Description

The present invention relates to operating methods for a continuous rolling mill comprising a number of rolling stands wherein rolling stock passing through the continuous rolling mill is successively rolled in a plurality of the rolling stands so that the rolling stock has predetermined end properties when leaving the rolling line.

The present invention further relates to a computer program comprising machine code which is directly executable by a controller of a continuous rolling mill and whose execution by the controller causes the controller to operate the continuous rolling mill in accordance with such an operating method.

The present invention further relates to a data carrier on which such a computer program is stored in machine-readable form.

The present invention further relates to a control device of a continuous rolling mill programmed with such a computer program, such that the control means operates the continuous rolling mill in accordance with an operating method of the kind explained above.

Finally, the present invention relates to a continuous rolling train with a number of rolling stands and a control device of the type described above, wherein the rolling stands are controlled by the control device.

An operating method of the type mentioned is, for example, from the US 2008/060403 A1 known. It explains how to proceed to maintain continuous operation of the continuous rolling mill, although this is the continuous rolling mill continuous rolling has a critical transition area, which can not be safely rolled. At its core is the doctrine of US 2008/060403 A1 in making a tracing of the transitional area through the continuous rolling mill and driving up each of the rolling stands of the continuous rolling mill when the critical transition area reaches the respective rolling mill and recommencing the rolling stock and resuming the rolling process as soon as the critical transition area reaches the respective rolling stand happened. The rolling stock is therefore rolled in the rolling stands of the continuous rolling mill only outside the critical transition area. The critical transition area itself as well as parts of the rolling stock adjacent to the critical transition area pass through the entire continuous rolling mill without being rolled.

In continuous rolling mills, rolling stock should be rolled as smoothly as possible (just continuously). Therefore, on the input side of the continuous rolling mill individual coils are attached to one another and, as a rule, connected by welding. This procedure is taken in particular during cold rolling of sheet metal, ie a strip-shaped rolling stock.

By rolling the rolling stock wear the rollers of the rolling stands. The strongest wear occurs here, based on one of the rolling stands, in the work rolls of the respective rolling stand. Back-up rolls and, if present, intermediate rolls wear to a lesser extent. With respect to the continuous rolling mill overall, the wear increases towards the outlet side of the continuous rolling mill.

It is known in the prior art to set the continuous rolling mill for changing rolls of a roll stand, wherein the rolling stock remains in the continuous rolling mill, that is, it is only stopped. Stopping causes rolling defects at the stands of the rolling stock. The rolling defects may include, in particular, dimensional errors and surface defects. at higher demands on the quality of the rolling stock, therefore, the part of the rolling stock in which the rolling defects occur, must be scrapped. The part of the rolling stock to be scrapped can in this case have a considerable length, for example 50 to 100 m. Furthermore, because of the temporary shutdown of the continuous rolling mill, its operating efficiency decreases.

It would be possible to both avoid the rolling defects and to increase the operating efficiency if it were possible to smoothly disassemble and integrate a rolling stand of the continuous rolling mill during continuous operation of the continuous rolling mill from the continuous rolling mill. The object of the present invention is to provide such possibilities.

• Eine Steuereinrichtung der Konti-Walzstraße steuert das auszugliedernde Walzgerüst derart an, dass das auszugliedernde Walzgerüst gemäß einem definierten zeitlichen Entlastungsverlauf vollständig entlastet wird,
• die Steuereinrichtung steuert örtlich simultan zum Entlasten des auszugliedernden Walzgerüsts mindestens ein anderes der Walzgerüste der Konti-Walzstraße derart an, dass das mindestens eine andere Walzgerüst gemäß einem definierten zeitlichen Belastungsverlauf belastet wird, wobei der Entlastungsverlauf des auszugliedernden Walzgerüsts und der Belastungsverlauf des mindestens einen anderen Walzgerüsts derart aufeinander abgestimmt sind, dass die Endeigenschaften des Walzguts erhalten bleiben,
• die Steuereinrichtung steuert eine Umfangsgeschwindigkeit von Arbeitswalzen des auszugliedernden Walzgerüsts bis zu dessen vollständigem Entlasten derart, dass eine durch das Walzen des Walzguts in dem auszugliedernden Walzgerüst bewirkte Auslaufgeschwindigkeit des Walzguts jederzeit mit einer vorbestimmten Sollauslaufgeschwindigkeit korrespondiert,
• die Steuereinrichtung steuert das auszugliedernde Walzgerüst nach dessen vollständigem Entlasten unter Beibehaltung einer Korrespondenz der Umfangsgeschwindigkeit der Arbeitswalzen mit der Sollauslaufgeschwindigkeit derart an, dass die Arbeitswalzen des auszugliedernden Walzgerüsts vom Walzgut abgehoben werden, und setzt sodann das auszugliedernde Walzgerüst still.

As far as it relates to the bumpless outsourcing of one of the rolling mill rolling mill stands from the continuous rolling mill, it is provided according to the invention that during the rolling of the rolling stock the following measures are taken:

• A control device of the continuous rolling train controls the ausliedernde mill stand such that the ausliedernde mill stand is fully relieved according to a defined time relief curve,
• The control device locally controls at least one other of the rolling mills of the continuous rolling train simultaneously to relieve the haul-off rolling stand in such a way that the at least one other rolling stand is loaded according to a defined time load curve, wherein the relief curve of the auszollernden rolling stand and the load profile of at least one other rolling stand are matched to one another such that the final properties of the rolling stock are maintained,
• the control device controls a peripheral speed of work rolls of the ausliedernden mill stand until its complete unloading such that a caused by the rolling of the rolling stock in the ausliedernden mill stand exit speed of the rolling always with corresponds to a predetermined target discharge speed,
• the control device controls the ausliedernde mill stand after its complete unloading while maintaining a correspondence of the peripheral speed of the work rolls with the target discharge speed such that the work rolls of the auszollernden rolling stand are lifted from the rolling stock, and then sets the ausliedernde mill stand still.

The term "locally simultaneous" is here meant in the sense that the ausliedernde roll stand rolls during the discharge course a certain portion of the rolling stock and the at least one other rolling mill is controlled such that during the load history, the at least one other rolling stand one and the same section of the rolling stock rolls. This correspondence can be easily reached by tracking. Tracing is well known to those skilled in the art.

In the context of the present invention, it is possible for the at least one other roll stand to be arranged upstream of the roll stand to be removed. However, it is also possible for the at least one other roll stand to be arranged downstream of the roll stand to be removed.

In a preferred embodiment of the present invention, it is provided that the control device loads a single other rolling stand locally simultaneously for relieving the outsourcing roll stand.

This property is not meant in the sense that there can be no changes in the other stands, but in the sense that the reduction of the stitch loss, which occurs by relieving the auszollernden mill stand, by a corresponding increase in the Stichabnahme in a single other Rolling mill is compensated.

In a particularly preferred embodiment of the present invention, it is provided that the control device locally simultaneously integrates the at least one other roll stand into the continuous rolling mill, in order to relieve the roll stand to be split off. In this case, so takes place a rolling stand change.

It is possible that the control device for relieving the ausliedernden mill stand a nip of the ausliedernden mill by appropriate predetermining a speed relation relative to the ausliedernden rolling mill upstream, rolling also rolling mill stand of Konti-Walzstraße in conjunction with acting on the employment of ausliedernden mill stand Tension control for a running into the ausliedernde rolling mill section of the rolling stock leads.

Alternatively, it is possible that the control device for relieving the auszollernden rolling stand a roll gap of the ausliedernden rolling mill position-controlled or force-controlled.

When the control means for relieving the ausliedernden mill performs a position or force control of the ausliedernden stand, it is possible that the control means prevailing in a rolling into the ausliedernde rolling mill section train of the rolling stock during the unloading of the auszollernden mill stand by tracking the peripheral speed of the work rolls of the spin-off rolling mill. In this case, the control device preferably takes into account the tracking of the peripheral speed of the work rolls of the take-off roll stand in at least one roll stand of the continuous rolling mill downstream of the rolling stand to be cast-off.

Alternatively, it is possible for the control device to have a section which enters into the rolling mill to be dismantled of the rolling stock prevailing train during the unloading of ausliedernden roll stand by tracking a peripheral speed of work rolls of the ausliedernden rolling mill immediately upstream, the rolling stock also rolling mill stands the continuous rolling mill. In this case, the control device preferably takes into account the tracking of the peripheral speed of the work rolls of the rolling mill immediately upstream, the rolling stock also rolling mill in at least one of the ausliedernden mill indirectly upstream, rolling also rolling mill stand of Konti-rolling mill.

• Eine Steuereinrichtung der Konti-Walzstraße steuert das einzugliedernde Walzgerüst derart an, dass eine Umfangsgeschwindigkeit von Arbeitswalzen des einzugliedernden Walzgerüsts mit einer Sollauslaufgeschwindigkeit des Walzguts am Ort des einzugliedernden Walzgerüsts korrespondiert, und steuert sodann das einzugliedernde Walzgerüst derart an, dass die Arbeitswalzen an das Walzgut angestellt werden, das Walzgut in dem einzugliedernden Walzgerüst aber noch nicht gewalzt wird,
• die Steuereinrichtung steuert das zu einzugliedernde Walzgerüst nach dem Anstellen der Arbeitswalzen des einzugliedernden Walzgerüsts an das Walzgut derart an, dass das einzugliedernde Walzgerüst in einem definierten zeitlichen Belastungsverlauf belastet wird,
• die Steuereinrichtung steuert örtlich simultan zum Belasten des einzugliedernden Walzgerüsts mindestens ein anderes der Walzgerüste der Konti-Walzstraße derart an, dass das mindestens eine andere Walzgerüst in einem definierten zeitlichen Entlastungsverlauf entlastet wird, wobei der Belastungsverlauf des einzugliedernden Walzgerüsts und der Entlastungsverlauf des mindestens einen anderen Walzgerüsts derart aufeinander abgestimmt sind, dass die Endeigenschaften des Walzguts erhalten bleiben,
• die Steuereinrichtung steuert die Umfangsgeschwindigkeit der Arbeitswalzen des einzugliedernden Walzgerüsts ab dem Belasten derart, dass eine durch das Walzen des Walzguts in dem einzugliedernden Walzgerüst bewirkte Auslaufgeschwindigkeit des Walzguts am Ort des einzugliedernden Walzgerüsts jederzeit mit der Sollauslaufgeschwindigkeit korrespondiert.

The bumpless incorporation of a roll stand is essentially inverse for bumpless outsourcing of a roll stand. Insofar as it concerns the bumpless incorporation of a roll stand not rolling the rolling stock into the continuous rolling train during the rolling of the rolling stock, it is therefore provided according to the invention that the following measures are taken during the rolling of the rolling stock:

• A control device of the continuous rolling mill controls the rolling mill to be incorporated such that a peripheral speed of work rolls of the rolling mill to be incorporated corresponds to a target run speed of the rolling stock at the location of the rolling mill to be incorporated, and then controls the rolling mill to be incorporated such that the work rolls are set against the rolling stock However, the rolling stock in the einzugliedernden mill is not yet rolled,
• the control device controls the roll stand to be incorporated after setting the work rolls of the roll stand to be integrated into the rolling stock in such a way that the roll stand to be incorporated is loaded in a defined time load course,
• the control device locally controls at least one other of the rolling mills of the continuous rolling train simultaneously to load the rolling mill to be integrated such that the at least one other rolling mill stands in a defined time frame Relief curve is relieved, wherein the load profile of einzugliedernden mill stand and the relief curve of the at least one other rolling stand are coordinated so that the final properties of the rolling stock are maintained,
• the control device controls the peripheral speed of the work rolls of the rolling mill to be incorporated from the loading such that a run-out speed of the rolling stock caused by the rolling of the rolling stock in the rolling mill to be integrated corresponds at all times to the target run-out speed at the location of the rolling mill to be incorporated.

The term "locally simultaneous" is to be understood in the same sense as when outsourcing a rolling mill from the continuous rolling mill. Analogous to the outsourcing of a roll stand, it is also possible when incorporating a roll stand that the at least one other roll stand is arranged upstream of the rolling mill to be incorporated. However, it is also possible that the at least one other rolling stand is arranged downstream of the rolling mill to be incorporated.

In a preferred embodiment it is provided that the control device relieves a single other rolling stand locally simultaneously to load the rolling mill to be incorporated. Analogous to the relieving of a take-off roll stand, the statement is to be understood in such a way that the stitch decrease occurring as a result of the loading of the roll stand to be integrated leads to a corresponding reduction in the pass decrease of a single other unloaded roll stand.

It is particularly preferred if the control device spatially simultaneously outsources the at least one other roll stand from the continuous rolling mill to load the rolling mill to be incorporated.

Analogous to the outsourcing of a roll stand, it is also possible when integrating a roll stand that the control device for loading the rolling mill to be incorporated joins a rolling gap of the rolling mill to be integrated by correspondingly specifying a speed relation relative to a rolling stand of the continuous rolling mill upstream of the rolling mill to be incorporated with a train control acting on the employment of the rolling mill to be incorporated for a section of the rolling stock entering the rolling mill to be incorporated. Likewise, it is alternatively possible that the control device for loading the einzugliedernden rolling stand a roll gap of einzugliedernden rolling mill position-controlled or force-controlled.

Analogous to the outsourcing of a roll stand, it is possible in the case of a position or force control that the control device controls a train in a rolling into the einzugliedernde section of the rolling stock during the loading of einzugliedernden roll stand by tracking the peripheral speed of the work rolls of einzugliedernden mill stand. In this case, the control device preferably takes into account the tracking of the peripheral speed of the work rolls of the rolling mill to be incorporated into at least one rolling stand of the continuous rolling mill which is arranged downstream of the rolling mill to be integrated into the rolling mill.

Alternatively, it is possible for the control device to control a train prevailing in a section of the rolling stock to be incorporated into the rolling stock to be incorporated during the loading of the roll stand to be integrated by tracking a peripheral speed of work rolls of a rolling stand of the rolling mill immediately preceding the roll rolling of the continuous rolling mill rolling the rolling stock , In this case, the control device preferably takes into account the tracking of the peripheral speed of the work rolls of the roll stand immediately preceding the roll-in to be incorporated, the rolling mill rolling mill in at least one of the einzugliedernden roll stand indirectly upstream, the rolling stock also rolling mill stand of Konti-rolling mill.

The computer program according to the invention has machine code whose execution by the control device causes the control device to operate the continuous rolling mill in accordance with an operating method according to the invention. On the disk is stored in machine-readable form such a computer program. The control device of the continuous rolling mill is programmed with a computer program according to the invention. The continuous rolling mill has such a control device.

FIG 1

schematisch eine Konti-Walzstraße,

FIG 2 bis 6

Ablaufdiagramme,

FIG 7 bis 9

mögliche Entlastungsverläufe und Belastungsverläufe und

FIG 10 bis 12

mögliche Ausgestaltungen eines Ausschnitts der Konti-Walzstraße von FIG 1.

Further advantages and details will become apparent from the following description of exemplary embodiments in conjunction with the drawings. In a schematic representation:

FIG. 1

schematically a continuous rolling mill,

FIGS. 2 to 6

Flowcharts,

FIGS. 7 to 9

possible relief processes and load profiles and

FIGS. 10 to 12

possible embodiments of a section of the continuous rolling mill of FIG. 1 ,

According to FIG. 1 For example, only work rolls 3, 3 ', 3 "of rolling mills 1, 1', 1" are shown however, have further rolls, for example back-up rolls and intermediate rolls. A rolling stock 2 passes through the continuous rolling mill. As a rule, the rolling stock 2 is strip-shaped, for example a sheet metal. In principle, however, the rolling stock 2 could have a different cross-sectional shape.

The rolling stock 2 is rolled successively in several of the rolling stands 1, 1 ', 1 "of the continuous rolling mill as it passes through the continuous rolling mill of the rolling stock 2. In principle, however, a hot rolling of the rolling stock 2 is possible. Due to the rolling of the rolling stock 2, the rolling stock 2 when leaving the continuous rolling mill on predetermined end properties, for example, predetermined final dimensions and a predetermined surface finish (in particular surface roughness). The final properties of the rolling stock 2 are different here from the initial properties of the rolled stock 2. The initial properties of the rolled stock 2 are the properties that the rolled stock 2 has when entering the continuous rolling mill.

It is possible for the rolling stock 2 to be rolled in all rolling mills 1, 1 ', 1 "of the continuous rolling mill FIG. 1 However, the rolling stand 1 'is not engaged. The work rolls 3 'of this roll stand 1' are thus spaced from the rolling stock 2. It will be described below, inter alia, how the rolling stand 1 'smoothly during operation of Konti-rolling mill (ie while the rolled material 2 is rolled in the continuous rolling mill) can be incorporated into the continuous rolling mill. Likewise, it will be described how the roll stand 1 ", which according to FIG. 1 is engaged, bum-free can be spun off during the ongoing operation of the continuous rolling mill from the continuous rolling mill.

According to FIG. 1 For example, the rolling mill 1 'to be incorporated is the second of six rolling stands 1, 1', 1 "of the cold rolling mill The rolling stand 1" to be dismantled is the fifth of the rolling stands 1, 1 ', 1 "of the continuous rolling mill. It may be both the einzugliedernden and auszollernden mill stand 1 ', 1 "to any of the rolling stands 1, 1', 1" of the continuous rolling mill, ie to the first, second, third, etc. rolling stand 1, 1 ', 1 "of the continuous rolling mill. In addition, the roll stand 1 'to be incorporated can, as seen in the running direction x of the rolling stock 2, alternatively be arranged in front of or behind the roll stand 1 "to be removed of six rolling stands also have more or less rolling stands 1, 1 ', 1 ".

The continuous rolling mill has a control device 4 which controls the rolling stands 1, 1 ', 1 ", ie the control device 4 determines how the continuous rolling mill is operated from, with the controller 4 is programmed.

The computer program 5 has according to FIG. 1 Machine code 6, which is directly executable by the control device 4. The execution of the machine code 6 by the control device 4 causes the control device 4 to operate the continuous rolling mill in accordance with modes of operation which will be explained in more detail below in connection with the further FIG.

The computer program 5 can be supplied to the control device 4 in various ways. For example, it is possible to supply the computer program 5 to the control device 4 via a computer-computer connection 7. The computer-computer connection 7 can be, for example, the World Wide Web or a local computer network (LAN). Alternatively, the computer program 5 can be supplied to the control device 4 via a data carrier 8, on which the computer program 5 is stored in machine-readable form-usually digital. Purely by way of example is here in FIG. 1 as a disk 8 a CD-ROM shown schematically. However, the data carrier 8 could be designed differently, for example as a USB memory stick or as an SD memory card.

In operation, the controller 4 controls the continuous rolling mill in accordance with an operating method which will be described below in connection with FIG FIG. 2 is explained.

According to FIG. 2 In a step S1, the control device 4 checks whether one of the rolling stands 1, 1 ', 1 "is to be outsourced, and if so, it is determined in a step S2 which For example, the control device 4 can receive a corresponding input from an operator 9 for this purpose.

In an analogous manner, the control device 4 checks in steps S3 and S4 whether one of the rolling mills 1, 1 ', 1 "is to be incorporated in the continuous rolling mill. If this is the case, the control device 4 determines in steps S5 or S6, which of the rolling stands 1, 1 ', 1 "to be incorporated. Again, a corresponding input of the operator 9 is possible again.

Depending on the result of the tests of steps S1, S3 and S4, one of the steps S7 to S10 is then executed. In step S7, a roll stand change takes place, ie the integration of the roll stand 1 'to be integrated into it and the locally simultaneous outsourcing of the roll stand 1 "to be split. In step S9, incorporation of the roll stand 1 'to be integrated takes place. In step S10, a normal rolling operation is carried out, as is well known for continuous rolling mills.

It is possible, instead of the procedure of FIG. 2 to carry out a simplified method, which will be described below in connection with FIG. 3 is explained. The main difference between the approaches of 2 and FIG. 3 is that in the approach of FIG. 3 unlike the approach of FIG. 2 the isolated incorporation of a roll stand 1 'to be incorporated and the isolated outsourcing of a roll stand 1 "to be taken apart are not permitted, but instead a rolling stand change takes place FIG. 3 therefore contains only the steps S1, S2, S5, S7 and S10 of FIG. 2 ,

In the context of step S8, so to outsource the ausliedernden mill stand 1 "without simultaneous Eingliedern another rolling mill 1 ', according to FIG. 4 proceed as follows:

In a step S11, the control device 4 starts to relieve the roll stand 1 "to be taken out locally. At the same time, the control device 4 starts to load at least one other rolling stand 1, 1 'in step S11 the rolling stand 1 'is not loaded, it is (theoretically) possible to load the rolling stand 1', which is not yet loaded at the beginning, but generally only the other rolling stands 1 already in mesh and rolling the rolling stock 2 will be loaded loaded.

In a step S12, the control device 4 continues the unloading of the roll stand 1 "to be taken out according to a defined time relief curve The control device 4 controls a peripheral speed vU" of the work rolls 3 "of the roll stand 1" to be split-off such that a discharge speed v "of the rolled stock 2 , which is caused by the rolling of the rolling stock 2 in the ausliedernden mill stand 1 ", at any time with a predetermined target discharge speed v" * corresponds to the target discharge speed v "* may be alternatively constant in time or temporally variable. As part of the determination of the required circumferential speed vU ", the control device 4 takes into account in particular the change in the overfeed that results in the roll stand 1" to be removed by relieving the roll stand 1 "to be taken apart US 2008/060403 A1 ,

Locally simultaneously sets the control device 4 in a step S13 according to a defined temporal load course, the load of at least one other rolling stand 1, 1 'continues. In this case too, circumferential speeds vU, vU 'of the work rolls 3, 3' of the corresponding rolling mills 1, 1 'always correspond to the changing overfeed in the respective rolling stand 1, 1 ', so that respective local exit speeds v, v' correspond to a respective target exit speed v *, v '*.

The load profiles of the other roll stands 1, 1 'are matched to the relief curve of the roll stand 1 "to be removed in such a way that the end properties of the rolled stock 2 remain. Relieving the roll stand to be split off and loading the other rolling stands 1, 1' thus has no effects the quality of the rolled stock 2.

In a step S14, the control device 4 checks whether the unloading of the roll stand 1 "to be removed is already complete.If this is not the case, the control device 4 returns to step S12, ie sets the unloading of the roll stand 1" to be taken off and the one corresponding thereto Loading the at least one other rolling mill 1, 1 'continued.

When the unloading of the detachable rolling mill 1 "is completed, the control device 4 proceeds to a step S15 In step S15, the control device 4 drives the rolling stand 1" to be taken out such that the correspondence of the peripheral speed vU "of the work rolls 3" of the rolling stand to be split 1 "with the target discharge speed v" * is maintained. The control device 4 then controls the roll stand 1 "to be split-off in such a way that the work rolls 3" of the roll stand 1 "to be removed are lifted off the rolling stock 2. After the work rolls 3" of the roll stand 1 to be split off, the control device 4 sets the roll stand 1 "to be split-off. silent in a step S17.

At the end of the discharge of the ausliedernden mill stand 1 "trains ZA, ZB, which occur in the rolling stock 2 immediately before and immediately behind the auszollernden mill stand 1" must be the same. Otherwise, the rolling stock would be 2 along Slips 3 "of the dismantling roll stand 1" slip. The lines ZA, ZB before and after the roll stand 1 "to be dismantled must therefore be aligned with one another.The matching can take place alternatively at the beginning of the step S11, between the steps S11 and S12 or in the course of the step S12 from the already mentioned US 2008/060403 A1 known.

As part of the approach of FIG. 4 the additional load occurring is usually distributed to several other rolling stands 1. In individual cases, however, it is possible that the control device 4 in the context of the execution of the method of FIG. 4 only a single other rolling mill 1 loaded.

For incorporating a rolling mill 1 'to be incorporated without local simultaneous outsourcing of another rolling stand 1 ", ie for implementing step S9 of FIG FIG. 2 , according to FIG. 5 proceed as follows:

Initially, the control device 4 controls the roll stand 1 'to be incorporated in a step S21 in such a way that a peripheral speed vU' of the work rolls 3 'of the roll stand 1' to be incorporated corresponds to a set exit speed v '* of the rolled stock 2 at the location of the roll stand 1' to be integrated. Then controls the controller 4 einzugliedernde roll stand 1 'in a step S22 such that the work rolls 3' of einzugliedernden roll stand 1 'are employed on the rolling stock 2, the rolling stock 2 in the einzugliedernden roll stand 1' but not yet rolled. Thus, the work rolls 3 'of the roll stand 1' to be integrated roll off only on the rolling stock 2 without rolling (i.e., forming) the rolled stock 2.

In a step S23, the control device 4 begins to load the roll stand 1 'to be integrated into a defined time load course. Locally simultaneously to load the einzugliedernden rolling mill starts the

Control device 4, to relieve at least one other rolling stand 1, 1 "of the continuous rolling mill according to a defined time relief curve End properties of the rolling stock 2 are maintained.

In a step S24, the control device 4 continues the loading of the roll stand 1 'to be integrated into the system according to the defined time load profile. In this case, the control device 4 controls the peripheral speed vU 'of the work rolls 3' of the roll stand 3 'to be incorporated such that a discharge speed v' of the rolled stock 2 at the location of the rolling stand 1 'to be incorporated corresponds to the target discharge speed v' *. In this case, the target discharge speed v '* may alternatively be constant in time or variable in time.

In a step S25, the control device 4 continues the unloading of the other rolling stands 1, 1 "analogously to the loading of the rolling mill 1 'to be integrated in. In this case too, the control device 4 takes into account the determination of peripheral speeds vU, vU" of the work rolls 3, 3 ". the corresponding rolling mills 1, 1 "according to the respective momentary relief changing overruns of the rolling stock. 2

In a step S26, the control device 4 checks whether the roll stand 1 'to be incorporated is already fully loaded. If this is not the case, the control device 4 returns to step S24, thus continuing the loading operation of the rolling mill 1 'to be integrated and the corresponding unloading operation of the other rolling stands 1, 1. Otherwise, the starting point is the incorporation of the rolling mill to be incorporated If necessary, however, in one additional step S27 one may be possible remaining speed error can be eliminated.

If no rolling stand 1 "is simultaneously spun off locally for the integration of the rolling mill 1 'to be incorporated, the relief to be effected is generally distributed among a plurality of other rolling stands 1, 1". In individual cases, however, it is possible that only a single other rolling stand 1, 1 "is relieved.

For rolling stand change, ie for the implementation of step S7 of FIG. 2 or. FIG. 3 , the procedure is as described below in connection with FIG. 6 is explained. FIG. 6 This is essentially a combination of the procedures of FIG. 4 and FIG. 5 , In detail:

Steps S31 and S32 correspond to steps S21 and S22 of FIG FIG. 5 , Steps S33 and S34 correspond to steps S11 to S13 of FIG FIG. 4 or S23 to S25 of FIG. 5 , A step S35 corresponds to the step S14 of FIG FIG. 4 , A step S36 corresponds to the step S27 of FIG FIG. 5 , Steps S37 to S39 correspond to steps S15 to S17 of FIG FIG. 4 ,

The main difference between the approach of FIG. 4 and 5 on the one hand and FIG. 6 On the other hand, it is that in the approach of FIG. 6 both the einzugliedernde mill stand 1 'is incorporated as well as the ausliedernde roll stand 1 "is spun off, while in the FIG. 4 and 5 only one of these measures is carried out.

As a rule, the procedure of FIG. 6 a one-to-one correspondence between the members of the rolling mill 1 'to be integrated and the outsourcing of the rolling stand 1 ". but additionally at least one of the rolling stands 1 is charged. Likewise, it is conversely possible that in addition to the outsourcing of auszlemmernden roll stand 1 "in addition to one of the rolling stands 1 is relieved when integrating the einzugliedernden roll stand 1.

It is possible for the control device 4 to position-control a roll gap of the roll stand 1 "to be split-off, in order to relieve the roll stand 1" to be split-off. In this case, the relief curve of the ausliedernden mill stand 1 "corresponds accordingly FIG. 7 a time course of a roll gap setpoint value p * for the roll stand 1 "to be taken off, which is raised as a function of the time t from an initial value corresponding to the predetermined time course to a final value. At the end value, the work rolls 3 "of the spin-off roll stand 1" no longer roll the rolling stock 2, but still roll on the rolling stock 2.

In an analogous manner, it is possible that the control device 4 for controlling the einzugliedernden rolling stand 1 'a roll gap of einzugliedernden rolling stand 1' position controlled leads. In this case, the loading course of the rolling mill 1 'to be incorporated runs essentially inversely to the relief course of the rolling stand 1 "to be removed.

The start and end values of the nip setpoint p * may be framework specific. In particular, the value at which the work rolls 3 ', 3 "only roll off depends on the thickness of the rolled stock 2 at the location of the respective rolling stand 1', 1". The value at which the rolling stock 2 is actively rolled, that is, a forming of the rolled stock 2, may be dependent on the stitch plan.

As an alternative to a position control, it is possible for the control device 4, in order to relieve the roll stand 1 to be split off, to perform force-controlled the roll gap of the rolling stand 1 "to be split-off. In this case, a target rolling force becomes F *, with which the ausliedernde roll stand 1 "rolls the rolling stock 2, according to FIG. 8 lowered according to a defined time course from a relatively high initial value to a relatively low final value (zero or near zero). At the high value, an active rolling (forming) of the rolling stock 2 takes place. At the low value, no plastic forming of the rolled stock 2 takes place.

In an analogous manner, the control device 4 to load the einzugliedernden roll stand 1 'the roll gap of einzugliedernden mill stand 1' force-controlled lead. The temporal load history is according to FIG. 8 essentially inversely to the relief curve of the spin-off roll stand 1 ".

Again alternatively it is according to the FIG. 9 and 10 possible that the control device 4 for relieving the ausliedernden rolling mill 1 "the rolling gap of ausliedernden roll stand 1" by corresponding predetermining a speed relation r * relative to a rolling stand 1 leads. In this case, the rolling stand 1 in question is arranged upstream of the roll stand 1 "to be cast-off and likewise rolls the rolling stock 2. It is therefore not a rolling stand 1 'still to be integrated in. In this case, the control device 4 implements accordingly FIG. 10 a control block 10, on the one hand, the speed ratio r * as a function of time t and on the other hand, the (measured or modeled) outlet speeds v, v "of the upstream rolling mill 1 and the auszollernden mill stand 1" are given. In the control block 10, the target peripheral speed vU * for the work rolls 3 of the upstream rolling stand 1 and / or the target peripheral speed vU "* for the work rolls 3" of the detachable rolling stand 1 "are determined on the basis of the speed ratio r * and the exit speeds v, v", the ratio of the outlet velocities v, v "becomes equal to the speed ratio r *. The nominal circumferential velocities vU, vU" * are set correspondingly, directly or for example by means of speed regulators 11. Alternatively to the outlet velocities v, v " It is also possible to use the corresponding target outlet speeds v *, v "*.

As part of the approach of FIG. 10 In addition, the train ZA must be regulated to a predetermined reference train Z * in front of the dismantling rolling stand 1 "This is effected by the control device 4 realizing a draft regulator 12 which acts by means of a corresponding correction signal δs * on the setting of the rolling mill 1" to be split. The detection of the train ZA takes place here by means of a suitable detection element 13.

For relieving the ausliedernden rolling mill 1 ", the speed ratio r * according to FIG. 9 gradually decreased from a value greater than one to the value one according to the predetermined time course. In conjunction with the tension control, which acts on the employment of the ausliedernden mill stand 1 "results in this case, the degree of deformation by itself. The corresponding procedure is known to those skilled in cold rolling of strips per se.

In an analogous manner, the incorporation of the einzugliedernden mill stand 1 'can take place. Only the temporal course of the speed relation r * must according to FIG. 9 be inverted accordingly.

As a rule, the roll stand 1 'to be integrated in and the roll stand 1 "to be split-off are inserted or removed in one and the same way, ie either both position-controlled or both controlled by force or both regulated by the speed relation r * to be integrated rolling stand 1 'and the ausliedernde roll stand 1 "in different ways to regulate. However, the coordination in detail is more complicated in this case.

Even if the unloading of the ausliederernden rolling stand 1 "or the incorporation of the einzugliedernden roll stand 1 'positional or force-controlled, the tension ZA must be controlled in the section of the rolling stock 2 immediately upstream of the respective rolling stand 1 ', 1 ", this being done by switching to a rolling speed a correction value δv * FIG. 11 be switched, that the control device 4, the peripheral speed vU ', vU "of the einzugliedernden rolling mill 1' and the spin-off rolling mill 1" controls. In this case, the control device 4 takes into account the tracking of the peripheral speed vU ', vU "of the work rolls 3', 3" of the roll stand 1 'to be incorporated or of the roll stand 1 "to be cast-off in at least one rolling stand 1, which also rolls the rolled stock 2, the part to be incorporated or ausliedernden mill stand 1 ', 1 ", however, is arranged downstream.

Alternatively, it is possible for the control device 4 to regulate the tension ZA in the section of the rolling stock 2 entering the corresponding roll stand 1 ', 1 "by virtue of the correction value δv * of the peripheral speed vU of the work rolls 3 of the respective rolling stand 1'. , 1 "directly upstream, the rolling stock 2 also rolling mill 1 tracks and thus corrects its peripheral speed vU. In this case, the control device 4 takes into account the tracking of the peripheral speed vU of the work rolls 3 of the immediately upstream roll stand 1 in at least one further roll stand 1, in which the rolling stock 2 is also rolled, the latter rolling stand 1, however, the rolling stand 1 to be integrated or detached ', 1 "is only indirectly upstream.

The present invention has many advantages. In particular, it is possible to insert and remove rolling stands 1, 1 ', 1 "during continuous operation of the continuous rolling mill, so that the desired high availability of the continuous rolling mill is retained despite the fact that it is inserted and removed no rolling defects Final dimensions and surface properties are retained. No waste is produced.

The above description is only for explanation of the present invention. The scope of the present invention, however, is intended to be determined solely by the appended claims.

Claims (18)

Operating method for a continuous rolling mill comprising a number of rolling stands (1, 1 ', 1 "), wherein a rolling stock (2) passing through the continuous rolling mill is successively formed in a plurality (1,1'") of the rolling stands (1, 1 '). , 1 ") is rolled so that the rolling stock (2) when leaving the rolling mill has predetermined end properties, wherein for outsourcing a (1") of the rolling stock (2) rolling mill stands (1, 1 ") from the continuous rolling mill during Rolling of the rolled stock (2), the following measures are taken: A control device (4) of the continuous rolling train controls the roll stand (1 ") to be split-off in such a way that the roll stand (1") to be removed is completely relieved in accordance with a defined time relief curve, - The control device (4) controls locally simultaneously for relieving the ausliedernden mill stand (1 ") at least one other of the rolling stands (1, 1 ') of Konti-rolling mill such that the at least one other rolling stand (1, 1') according to a the load history of the rolling mill (1 ") to be taken apart and the load course of the at least one other rolling stand (1, 1 ') are coordinated with one another such that the end properties of the rolling stock (2) are preserved, - The control device (4) controls a peripheral speed (vU ") of work rolls (3") of the ausliedernden rolling stand (1 ") until its complete unloading such that a by the rolling of the rolling stock (2) in the ausliedernden mill stand (1". ) caused output speed (v ") of the rolling stock (2) at any time with a predetermined target discharge speed (v" *) corresponds, - The control device (4) controls the ausliedernde mill stand (1 ") after its complete unloading while maintaining a correspondence of the peripheral speed (vU") of the work rolls (3 ") with the target discharge speed (v" *) such that the work rolls (3 ") of the ausliedernden mill stand (1") lifted from the rolling stock (2) be, and then sets the ausliedernde mill stand (1 "). Operating method according to claim 1,
characterized in that the control device (4) locally simultaneously to relieve the ausliedernden rolling mill (1 "), a single other rolling stand (1 ') charged. Operating method according to claim 1 or 2,
characterized in that the control device (4) locally simultaneously to relieve the ausliedernden mill stand (1 ") integrates the at least one other rolling stand (1 ') in the continuous rolling mill. Operating method according to claim 1, 2 or 3,
characterized in that the control device (4) for relieving the ausliedernden rolling mill (1 ") a rolling gap of the ausliedernden rolling stand (1") by appropriate predetermining a speed relation (r *) relative to the ausliedernden rolling mill (1 ") upstream, the rolling stock (2) Rolling rolling stand (1) of the continuous rolling mill in conjunction with a tension control acting on the setting of the roll stand (1 ") for a section of the rolling stock (2) entering the roll stand (1") to be removed. Operating method according to claim 1, 2 or 3,
characterized in that the control device (4) for relieving the ausliedernden rolling stand (1 ") a roll gap of the ausliedernden rolling mill (1") position-controlled or force-controlled. Operating method according to claim 5,
characterized, - That the control device (4) in a in the ausliedernde mill stand (1 ") incoming portion of the rolling stock (2) prevailing train (ZA) during the unloading of ausliedernden rolling mill (1") by tracking the peripheral speed (vU ") of the work rolls (3") of the spin-off roll stand (1 ") regulates and - that the control device (4) tracking the peripheral speed (vU ") of the work rolls (3") of the ausliedernden mill (1 ") in at least one of the ausliedernden rolling mill (1") downstream, the rolling stock (2) also rolling mill stand (1 ) of the continuous rolling mill. Operating method according to claim 5,
characterized, in that the control device (4) transmits a train (ZA) prevailing in a section of the rolling stock (2) running into the dismantling rolling stand (1) during the unloading of the roll stand (1 ") by tracking a peripheral speed (vU) of work rolls (FIG. 3) of the rolling mill (1 "), which is to be removed, which directly adjusts the rolling stock (2) and which also rolls rolling mill (1) of the continuous rolling mill, and - that the control device (4) the tracking of the peripheral speed (vU) of the work rolls (3) of the ausliedernden roll stand (1 ") immediately upstream, the rolling stock (2) also rolling mill stand (1) in at least one ausliedernden the roll stand (1". ) indirectly upstream, the rolling stock (2) also rolling mill stand (1) considered the continuous rolling mill. Operating method for a continuous rolling mill comprising a number of rolling stands (1, 1 ', 1 "), wherein a rolling stock (2) passing through the continuous rolling mill is successively formed in a plurality (1,1'") of the rolling stands (1, 1 '). , 1 "), so that the rolling stock (2) has predetermined final properties when leaving the rolling line, in particular operating method according to one of the above claims, wherein for integrating a rolling mill (1) which does not roll the rolling stock (2) into the continuous Walzstraße during rolling of the rolling stock (2) the following measures are taken: - A control device (4) of the continuous rolling mill controls the einzugliedernde mill stand (1 ') such that a peripheral speed (vU') of work rolls (3 ') of einzugliedernden rolling mill (1') with a target discharge speed (v '*) of the Walzguts (2) at the place of einzugliedernden mill stand (1 ') corresponds, and then controls the einzugliedernde mill stand (1') such that the work rolls (3 ') are employed on the rolling stock (2), the rolling stock (2) in However, the rolling mill (1 ') to be incorporated is not yet rolled, - The control device (4) controls the einzugliedernde roll stand (1 ') after hiring the work rolls (3') of einzugliedernden roll stand (1 ') to the rolling stock (2) such that the einzugliedernde mill stand (1') according to a burdened with a defined temporal load course, - The control device (4) controls locally simultaneously to load the einzugliedernden roll stand (1 ') at least one other of the rolling stands (1, 1 ") of Konti-rolling mill such that the at least one other roll stand (1, 1") according to a defined load relief curve is relieved, wherein the load profile of einzugliedernden rolling stand (1 ') and the relief curve of the at least one other rolling stand (1, 1 ") are coordinated such that the end properties of the rolling stock (2) are preserved - The control device (4) controls the peripheral speed (vU ') of the work rolls (3') of einzugliedernden roll stand (1 ') from the loading such that one by the rolling of the rolling stock (2) in the einzugliedernden mill stand (1') caused Outlet speed (v ') of the rolling stock (2) at the location of einzugliedernden mill stand (1) at any time with the target discharge speed (v' *) corresponds. Operating method according to claim 8,
characterized in that the control device (4) locally simultaneously to load the einzugliedernden rolling stand (1 ') relieves a single other rolling stand (1 "). Operating method according to claim 8 or 9,
characterized in that the control device (4) spatially simultaneously to load the einzugliedernden rolling mill (1 '), the at least one other rolling mill (1 ") outsourced from the continuous rolling mill. Operating method according to claim 8, 9 or 10,
characterized in that the control device (4) for loading the rolling mill to be incorporated (1 ') a rolling gap of einzugliedernden roll stand (1') by appropriate predetermining a speed relation (r *) relative to a einzugliedernden rolling mill (1 ') upstream, the rolling stock (2) rolling rolling stand (1) of the continuous rolling mill in conjunction with an on the employment of einzugliedernden rolling stand (1 ') acting tension control for a einzugliedernde in the roll stand (1') incoming portion of the rolling stock (2). Operating method according to claim 8, 9 or 10,
characterized in that the control device (4) for loading the einzugliedernden rolling mill (1 ') a roll gap of einzugliedernden rolling stand (1') position-controlled or force-controlled. Operating method according to claim 12,
characterized, in that the control device (4) has a train (ZA) prevailing in a section of the rolling stock (2) to be incorporated into the rolling mill (1 ') to be incorporated during the loading of the rolling mill (1') to be incorporated by tracking the peripheral speed (vU ') of the rolling mill Work rolls (3 ') of the einzugliedernden roll stand (!') Controls and - that the control device (4) the tracking of the peripheral speed (vU ') of the work rolls (3') of einzugliedernden rolling stand (1 ') in at least one einzugliedernden roll stand (1') downstream, the rolling stock (2) rolling mill stand (1) considered the continuous rolling mill. Operating method according to claim 12,
characterized, - That the control device (4) in a in the einzugliedernde rolling mill (1 ') incoming portion of the rolling stock (2) prevailing train (ZA) during the loading of einzugliedernden roll stand (1') by tracking a peripheral speed (vU) of work rolls (3) a roll stand (1) of the continuous rolling mill which is directly upstream of the rolling mill (1) to be integrated into the rolling stock (2) and controls - that the control device (4) the tracking of the peripheral speed (vU) of the work rolls (3) of the einzugliedernden roll stand (1 ') immediately upstream, the rolling stock (2) rolling mill stand (1) in at least one einzugliedernden rolling mill (1') indirectly upstream, the rolling stock (2) also rolling mill stand (1) considered the continuous rolling mill. A computer program comprising machine code (6) directly executable by a control means (4) of a continuous rolling mill and the execution thereof by the control means (4) causing the control means (4) to drive the continuous rolling mill according to an operating method of any one of above claims. Data carrier on which in machine-readable form a computer program (5) according to claim 15 is stored. A continuous rolling mill controller programmed with a computer program (5) according to claim 15, such that the control means operates the continuous rolling mill according to an operating method according to any one of claims 1 to 14. Continuous rolling mill with a number of rolling stands (1, 1 ', 1 ") and a control device (4) according to claim 17, wherein the rolling stands (1, 1', 1") are controlled by the control device (4).

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