EP2293889B1 - Conti-mill train with integration/deintegration of roller frameworks in active operation - Google Patents

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. document JP-A 62101309 discloses a method according to the preambles of claims 1 and 8, respectively

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, so dass das auszugliedernde Walzgerüst während des Entlastungsverlaufs einen bestimmten Abschnitt des Walzguts walzt,
• die Steuereinrichtung steuert 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 während des Belastungsverlaufs das mindestens eine andere Walzgerüst ein- und denselben Abschnitt des Walzguts walzt wie das auszugliedernde Walzgerüst während des Entlastungsverlaufs und 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, so that the ausliedernde rolling stand during the relief curve rolls a certain portion of the rolling stock,
• the control device controls at least one other of the rolling mills of the continuous rolling mill in such a way that the at least one other rolling stand is loaded in accordance with a defined time load curve, wherein the relief curve of the auszollernden rolling mill and the load profile of the at least one other rolling mill are coordinated such that during the load curve, the at least one other roll stand rolls one and the same section of the rolled stock as the roll stand to be split during the relief process and that the end properties of the rolled stock are preserved,
• the control means controls a peripheral speed of work rolls of the roll stand to be split up to its complete unloading in such a way that an outflow speed of the rolling stock caused by the rolling of the rolling stock in the roll stand to be split corresponds at all times to a predetermined set exit 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 fact that the ausliederernde roll stand during the discharge course rolls a certain portion of the rolling stock and the at least one other rolling stand is controlled such that during the load history, the at least one other rolling mill on and rolling the same portion of the rolling stock, hereinafter also referred to as "local Simultaneity ". Local simultaneity can be easily achieved 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 to compensate for the relief of the auszollernden mill stand.

This property is not meant here in the sense that in the other rolling stands no changes can occur, but in the sense that the reduction of the stitch loss, by relieving the ausliedernden mill stand occurs, is compensated by a corresponding increase in the stitch loss in a single other rolling mill.

In a particularly preferred embodiment of the present invention, it is provided that the control device for compensating for the relief of the auszollernden mill stand incorporates the at least one other rolling stand in the continuous rolling mill. 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 rolling stand in at least one of the auszuliedernden Rolling mill downstream, the rolling stock also rolling mill stand of Konti rolling mill.

Alternatively, it is possible for the control device to regulate a train prevailing in a section of the rolling stock that is to be taken apart from the rolling stock to be separated by tracking a peripheral speed of work rolls of a roll stand immediately preceding the roll stand to be rolled, also rolling the rolling stand of 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, so dass das einzugliedernde Walzgerüst während des Belastungsverlaufs einen bestimmten Abschnitt des Walzguts walzt,
• die Steuereinrichtung steuert 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 während des Entlastungsverlaufs das mindestens eine andere Walzgerüst ein- und denselben Abschnitt des Walzguts walzt wie das einzugliedernde Walzgerüst während des Belastungsverlaufs und 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 rolling mill 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 rolling stand to be integrated into a defined time load course is loaded, so that the einzugliedernde rolling mill during the load course rolls a certain portion of the rolling stock,
• the control device controls at least one other of the rolling mills of the continuous rolling mill in such a way that the at least one other rolling stand is relieved in a defined time relief curve, wherein the load course of the rolling mill to be incorporated and the discharge course of the at least one other rolling stand are coordinated such that during the unloading process, the at least one other rolling mill on and rolling the same portion of the rolling stock as the einzollernde rolling stand during the load history and 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.

Again, the term "local simultaneity" is used. 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 roll stand to compensate for the load of the rolling mill to be incorporated. Analogous to relieving a ausliedernden rolling stand here the statement is to be understood such that the By reducing the einzugliedernden rolling stand occurring Stichabnahme leads to a corresponding reduction in the loss of a single other unloaded mill stand.

It is particularly preferred if the control device for compensating the load of the rolling stock to be incorporated separates the at least one other rolling stand from the continuous rolling mill.

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 to be integrated directly into the rolling mill rolling mill rolling in at least one of the rolling mill einzugliedernden indirectly upstream, the rolling stock also rolling mill stand of the continuous 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 one of the work rolls 3, 3 ', 3 "of the rolling stands 1, 1', 1" is shown 1, 1 ', 1 ", however, may comprise further rolls, for example back-up rolls and intermediate rolls A rolling stock 2 passes through the continuous rolling mill 2. As a rule, the rolling stock 2 is strip-shaped, for example a sheet metal exhibit.

The rolling stock 2 is rolled successively in several of the rolling mills 1, 1 ', 1 "of the continuous rolling mill as it passes through the continuous rolling mill, in which case cold rolling of the rolled stock 2 is generally carried out. Due to the rolling of the rolling stock 2, the rolling stock 2 has predetermined final properties when exiting the continuous rolling mill, for example predetermined final dimensions and a predetermined surface finish (in particular surface roughness) Rolling 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 the rolling mill 1 'to be integrated is the second of six rolling stands 1, 1', 1 "of the cold rolling mill. The rolling mill 1" to be taken apart is the fifth of the rolling stands 1, 1 ', 1 "of the continuous rolling mill, but this illustration is purely by way of example: The rolling mill 1', 1" to be incorporated as well as to be dismantled can be any of the rolling stands 1, 1 ', 1 "of the continuous rolling mill , ie around the first, second, third, etc. rolling stand 1, 1 ', 1 "of the continuous rolling mill. Alternatively, the roll stand 1 'to be incorporated can, as seen in the running direction x of the rolled stock 2, alternatively be arranged in front of or behind the roll stand 1 "to be taken out Finally, the continuous rolling line can also have more or fewer rolling stands 1, 1', 1" instead of six rolling stands.

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. The disk However, 8 could be designed differently, for example as a USB memory stick or 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 spun off. 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 incorporation of the roll stand 1 'to be integrated into it and the local simultaneous definition (see above) of the roll stand 1 "to be split off. 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 member to be incorporated Roll stand 1 'and the isolated outsourcing of ausliedernden roll stand 1 "are not permitted, but always takes place a roll stand change FIG. 3 therefore contains only the steps S1, S2, S5, S7 and S10 of FIG. 2 ,

In the context of step S8, that is, for the outsourcing of ausliedernden roll stand 1 "without simultaneous incorporation of another roll stand 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 peripheral speed vU ", the control device 4 takes into account, in particular, the change in the overfeed which results in the roll stand 1" to be removed by relieving the roll stand 1 "to be split appropriate procedure is known per se, for example from the already mentioned 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. Here, too, circumferential speeds vU, vU 'of the work rolls 3, 3' of the corresponding rolling stands 1, 1 'are always determined in accordance with the changing lead in the respective rolling stand 1, 1', so that respective local exit speeds v, v 'with a respective target discharge speed v *, v '* correspond.

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. Then, the control device 4 controls the ausliedernde mill stand 1 "such that the work rolls 3" of the spin-off rolling stand 1 "from Walzgut 2 are lifted. After lifting off the work rolls 3 "of the spin-off roll stand 1", the control device 4 sets the roll stand 1 "to be split-off 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 2 would slide along the work rolls 3 "of the roll stand 1 to be split off". 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.

• Zunächst steuert die Steuereinrichtung 4 das einzugliedernde Walzgerüst 1' in einem Schritt S21 derart an, dass eine Umfangsgeschwindigkeit vU' der Arbeitswalzen 3' des einzugliedernden Walzgerüsts 1' mit einer Sollauslaufgeschwindigkeit v'* des Walzguts 2 am Ort des einzugliedernden Walzgerüsts 1' korrespondiert. Sodann steuert die Steuereinrichtung 4 das einzugliedernde Walzgerüst 1' in einem Schritt S22 derart an, dass die Arbeitswalzen 3' des einzugliedernden Walzgerüsts 1' an das Walzgut 2 angestellt werden, das Walzgut 2 in dem einzugliedernden Walzgerüst 1' aber noch nicht gewalzt wird. Die Arbeitswalzen 3' des einzugliedernden Walzgerüsts 1' rollen also lediglich auf dem Walzgut 2 ab, ohne das Walzgut 2 zu walzen (d.h. umzuformen).

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 the einzugliedernden rolling stand 1 'are employed on the rolling stock 2, the rolling stock 2 in the einzugliedernden Roll stand 1 'but not yet rolled. The work rolls 3 'of the einzugliedernden mill stand 1' roll so only on the rolling stock 2, without rolling the rolling stock 2 (ie reshape).

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 with the loading of the rolling mill to be integrated, the control device 4 begins to relieve at least one other rolling stand 1, 1 "of the continuous rolling mill according to a defined time relief curve "are matched to one another in such a way that the 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 an additional step S27, a possibly 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.

• Schritte S31 und S32 korrespondieren mit den Schritten S21 und S22 von FIG 5. Schritte S33 und S34 korrespondieren mit den Schritten S11 bis S13 von FIG 4 bzw. S23 bis S25 von FIG 5. Ein Schritt S35 korrespondiert mit dem Schritt S14 von FIG 4. Ein Schritt S36 korrespondiert mit dem Schritt S27 von FIG 5. Schritte S37 bis S39 korrespondieren mit den Schritten S15 bis S17 von FIG 4.

For rolling stand change, ie for the implementation of step S7 of FIG. 2 respectively. 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 roll stand 1 'is incorporated as well as the ausliedernde roll stand 1 "is spun off, while at the FIG. 4 and 5 only one of these measures is carried out.

As a rule, the procedure of FIG. 6 however, in individual cases it is possible that, on the one hand, the roll stand 1 'to be incorporated is incorporated, but in addition at least one is involved in the outsourcing of the roll stand 1 to be split the rolling stands 1 is loaded. Likewise, it is conversely possible that in addition to outsourcing the ausliederernden roll stand 1 "in addition to one of the rolling stands 1 is relieved when incorporating the einzugliedernden mill 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 depends the work rolls 3 ', 3 "only unroll, from the thickness of the rolling stock 2 at the location of the respective rolling mill 1', 1" from. 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 F *, with which the roll stand 1 "to be split off, rolls the rolling stock 2, according to FIG 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 are based on the velocity relation r * and the outgoing speeds v, v "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 extractable rolling stand 1" determined such that the ratio of the outlet velocities v, v "equal The desired circumferential speeds vU, vU "* are set correspondingly, directly or for example by means of speed controllers 11. As an alternative to the exit speeds v, v ", the corresponding target exit speeds v *, v" * can also be used.

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 rolling mill 1 'to be integrated in and the rolling stand 1 "to be split-off are switched on and off in one and the same way, ie either are position-controlled or both controlled by force or both regulated by the speed relation r *. Theoretically, however, it is possible to regulate the roll stand 1 'to be incorporated and the roll stand 1 "to be taken apart in different ways from one another, but the coordination in detail is more complicated in this case.

Even if the unloading of the ausliedernden roll stand 1 "or the incorporation of einzugliedernden roll stand 1 'position or force controlled, the train ZA in the respective rolling mill 1', 1" immediately upstream section of the rolling stock 2 must be controlled. This is preferably done by switching to a rolling speed a correction value δv *. The correction value δv * can according to 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 roll stand 1 However, the incoming or ausliedernden rolling mill 1 ', 1 "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 The desired final dimensions and surface properties are retained and no rejects are 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)

1. Operating method for a continuous rolling train which has a number of roll stands (1, 1' , 1''), with a rolling stock (2) passing through the continuous rolling train being rolled in a plurality (1, 1'') of the roll stands (1, 1', 1'') in succession, such that the rolling stock (2) has predetermined final properties when it leaves the rolling train, characterized in that to remove one (1'') of the roll stands (1, 1'') rolling the rolling stock (2) from the continuous rolling train during the rolling of the rolling stock (2), the following measures are taken:

   - a control device (4) of the continuous rolling train controls the roll stand (1") to be removed such that the roll stand (1") to be removed is completely relieved of load according to a defined temporal load relief profile, such that the roll stand (1") to be removed rolls a certain section of the rolling stock (2) during the load relief profile,

   - the control device (4) controls at least one other of the roll stands (1, 1') of the continuous rolling train such that the at least one other roll stand (1, 1') has load applied to it according to a defined temporal load application profile, wherein the load relief profile of the roll stand (1") to be removed and the load application profile of the at least one other roll stand (1, 1') are coordinated with one another such that, during the load application profile, the at least one other roll stand (1, 1') rolls one and the same section of the rolling stock (2) as the roll stand (1") to be removed during the load relief profile, and such that the final properties of the rolling stock (2) are maintained,

   - the control device (4) controls a rotational speed (vU'') of working rolls (3'') of the roll stand (1") to be removed until the latter is completely relieved of load, in such a way that an exit speed (v") of the rolling stock (2) effected by the rolling of the rolling stock (2) in the roll stand (1") to be removed corresponds at all times to a predetermined setpoint exit speed (v''*),

   - the control device (4) controls the roll stand (1") to be removed, after the latter has been completely relieved of load, and so as to maintain a correspondence of the rotational speed (vU") of the working rolls (3'') with the setpoint exit speed (v''*), such that the working rolls (3'') of the roll stand (1") to be removed are lifted off the rolling stock (2), and said control device (4) then brings the roll stand (1") to be removed to a stop.
2. Operating method according to Claim 1,
   characterized in that, to compensate the relief of load of the roll stand (1") to be removed, the control device (4) applies load to a single other roll stand (1').
3. Operating method according to Claim 1 or 2,
   characterized in that, to compensate the relief of load of the roll stand (1") to be removed, the control device (4) integrates the at least one other roll stand (1') into the continuous rolling train.
4. Operating method according to Claim 1, 2 or 3,
   characterized in that, to relieve the roll stand (1") to be removed of load, the control device (4) controls a rolling gap of the roll stand (1") to be removed by correspondingly predefining a speed relationship (r*) relative to a roll stand (1), which is positioned upstream of the roll stand (1") to be removed and is likewise rolling the rolling stock (2), of the continuous rolling train in conjunction with tension regulation, which acts on the screw-down of the roll stand (1") to be removed, for a section of the rolling stock (2) running into the roll stand (1") to be removed.
5. Operating method according to Claim 1, 2 or 3,
   characterized in that, to relieve the roll stand (1") to be removed of load, the control device (4) controls a rolling gap of the roll stand (1") to be removed by position regulation or force regulation.
6. Operating method according to Claim 5,
   characterized

   - in that, during the relief of load of the roll stand (1") to be removed, the control device (4) regulates a tension (ZA) prevailing in a section of the rolling stock (2) running into the roll stand (1") to be removed by adjusting the rotational speed (vU") of the working rolls (3'') of the roll stand (1") to be removed, and

   - in that the control device (4) takes the adjustment of the rotational speed (vU") of the working rolls (3'') of the roll stand (1") to be removed into consideration in at least one roll stand (1), which is positioned downstream of the roll stand (1") to be removed and is likewise rolling the rolling stock (2), of the continuous rolling train.
7. Operating method according to Claim 5,
   characterized

   - in that, during the relief of load of the roll stand (1") to be removed, the control device (4) regulates a tension (ZA) prevailing in a section of the rolling stock (2) running into the roll stand (1") to be removed by adjusting the rotational speed (vU) of working rolls (3) of a roll stand (1), which is positioned directly upstream of the roll stand (1") to be removed and is likewise rolling the rolling stock (2), of the continuous rolling train and

   - in that the control device (4) takes the adjustment of the rotational speed (vU) of the working rolls (3) of the roll stand (1), which is positioned directly upstream of the roll stand (1") to be removed and is likewise rolling the rolling stock (2), into consideration in at least one roll stand (1), which is positioned indirectly upstream of the roll stand (1") to be removed and is likewise rolling the rolling stock (2), of the continuous rolling train.
8. Operating method for a continuous rolling train which has a number of roll stands (1, 1' , 1''), with a rolling stock (2) passing through the continuous rolling train being rolled in a plurality (1, 1'') of the roll stands (1, 1', 1") in succession, such that the rolling stock (2) has predetermined final properties when it leaves the rolling train, in particular an operating method according to one of the above claims, characterized in that to integrate a roll stand (1') which is not rolling the rolling stock (2) into the continuous rolling train during the rolling of the rolling stock (2), the following measures are taken:

   - a control device (4) of the continuous rolling train controls the roll stand (1') to be integrated such that a rotational speed (vU') of working rolls (3') of the roll stand (1') to be integrated corresponds to a setpoint exit speed (v'*) of the rolling stock (2) at the location of the roll stand (1') to be integrated, and then controls the roll stand (1') to be integrated such that the working rolls (3') are screwed down on the rolling stock (2) but the rolling stock (2) is not yet rolled in the roll stand (1') to be integrated,

   - after the screw-down of the working rolls (3') of the roll stand (1') to be integrated on the rolling stock (2), the control device (4) controls the roll stand (1') to be integrated such that the roll stand (1') to be integrated has load applied to it according to a defined temporal load application profile, such that the roll stand (1') to be integrated rolls a certain section of the rolling stock (2) during the load application profile,

   - the control device (4) controls at least one other of the roll stands (1, 1'') of the continuous rolling train such that the at least one other roll stand (1, 1'') is relieved of load according to a defined temporal load relief profile, wherein the load application profile of the roll stand (1') to be integrated and the load relief profile of the at least one other roll stand (1, 1'') are coordinated with one another such that, during the load relief profile, the at least one other roll stand (1, 1'') rolls one and the same section of the rolling stock (2) as the roll stand (1") to be integrated during the load application profile, and such that the final properties of the rolling stock (2) are maintained,

   - after the application of load, the control device (4) controls the rotational speed (vU') of the working rolls (3') of the roll stand (1') to be integrated such that an exit speed (v'), effected by the rolling of the rolling stock (2) in the roll stand (1') to be integrated, of the rolling stock (2) at the location of the roll stand (1) to be integrated corresponds at all times to the setpoint exit speed (v'*).
9. Operating method according to Claim 8,
   characterized in that, to compensate the application of load to the roll stand (1') to be integrated, the control device (4) relieves a single other roll stand (1") of load.
10. Operating method according to Claim 8 or 9,
    characterized in that, to compensate the application of load to the roll stand (1') to be integrated, the control device (4) removes the at least one other roll stand (1") from the continuous rolling train.
11. Operating method according to Claim 8, 9 or 10,
    characterized in that, to apply load to the roll stand (1') to be integrated, the control device (4) controls a rolling gap of the roll stand (1') to be integrated by correspondingly predefining a speed relationship (r*) relative to a roll stand (1), which is positioned upstream of the roll stand (1') to be integrated and is rolling the rolling stock (2), of the continuous rolling train in conjunction with tension regulation, which acts on the screw-down of the roll stand (1') to be integrated, for a section of the rolling stock (2) running into the roll stand (1') to be integrated.
12. Operating method according to Claim 8, 9 or 10,
    characterized in that, to apply load to the roll stand (1') to be integrated, the control device (4) controls a rolling gap of the roll stand (1') to be integrated by position regulation or force regulation.
13. Operating method according to Claim 12,
    characterized

    - in that, during the application of load to the roll stand (1') to be integrated, the control device (4) regulates a tension (ZA) prevailing in a section of the rolling stock (2) running into the roll stand (1') to be integrated by adjusting the rotational speed (vU') of the working rolls (3') of the roll stand (1') to be integrated, and

    - in that the control device (4) takes the adjustment of the rotational speed (vU') of the working rolls (3') of the roll stand (1') to be integrated into consideration in at least one roll stand (1), which is positioned downstream of the roll stand (1') to be integrated and is rolling the rolling stock (2), of the continuous rolling train.
14. Operating method according to Claim 12,
    characterized

    - in that, during the application of load to the roll stand (1') to be integrated, the control device (4) regulates a tension (ZA) prevailing in a section of the rolling stock (2) running into the roll stand (1') to be integrated by adjusting a rotational speed (vU) of working rolls (3) of a roll stand (1), which is positioned directly upstream of the roll stand (1') to be integrated and is rolling the rolling stock (2), of the continuous rolling train, and

    - in that the control device (4) takes the adjustment of the rotational speed (vU) of the working rolls (3) of the roll stand (1), which is positioned directly upstream of the roll stand (1') to be integrated and is rolling the rolling stock (2), into consideration in at least one roll stand (1), which is positioned indirectly upstream of the roll stand (1') to be integrated and is likewise rolling the rolling stock (2), of the continuous rolling train.
15. Computer program which has machine code (6) which can be executed directly by a control device (4) of a continuous rolling train and the execution of which by the control device (4) has the effect that the control device (4) operates the continuous rolling train according to an operating method according to one of the above claims.
16. Data carrier on which a computer program (5) according to Claim 15 is stored in machine-readable form.
17. Control device of a continuous rolling train, which control device is programmed with a computer program (5) according to Claim 15 such that the control device operates the continuous rolling train according to an operating method according to one of Claims 1 to 14.
18. Continuous rolling train having a number of roll stands (1, 1', 1'') and having a control device (4) according to Claim 17, with the roll stands (1, 1', 1'') being controlled by the control device (4).

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