EP3107666B1 - Simple advance control of a wedge position of an advance frame - Google Patents

Description

• wobei einer Anzahl von Walzgerüsten der Walzanlage über einen ersten Zuführweg nacheinander mehrere erste flache Walzgüter aus Metall zugeführt werden,
• wobei die ersten flachen Walzgüter mittels der Anzahl von Walzgerüsten gewalzt werden,
• wobei das jeweilige erste flache Walzgut in der Anzahl von Walzgerüsten zunächst in mindestens einem Vorwalzstich mit einer ersten Keilanstellung vorgewalzt wird und sodann in Fertigstichen fertiggewalzt wird,
• wobei nach dem Fertigwalzen des jeweiligen ersten flachen Walzguts ein im fertiggewalzten jeweiligen ersten flachen Walzgut vorhandener erster Dickenkeil messtechnisch erfasst wird,
• wobei der im fertiggewalzten jeweiligen ersten flachen Walzgut vorhandene erste Dickenkeil mit einem ersten Zielkeil verglichen wird,
• wobei anhand einer Abweichung des vorhandenen ersten Dickenkeils von dem ersten Zielkeil und der ersten Keilanstellung eine neue erste Keilanstellung für den mindestens einen Vorwalzstich ermittelt wird und
• wobei die erste Keilanstellung bei dem mindestens einen Vorwalzstich für das als nächstes zu walzende erste flache Walzgut entsprechend dem neu ermittelten Wert der ersten Keilanstellung eingestellt wird, so dass das als nächstes zu walzende erste flache Walzgut in dem mindestens einen Vorwalzstich mit dem neu ermittelten Wert der ersten Keilanstellung vorgewalzt wird.

The present invention relates to an operating method for a rolling mill,

• wherein a number of rolling stands of the rolling mill are fed in succession a plurality of first flat rolled metal goods via a first feed path,
• wherein the first flat rolled goods are rolled by means of the number of rolling stands,
• wherein the respective first flat rolling stock in the number of rolling stands is first rough-rolled in at least one roughing pass with a first wedge setting and then finish-rolled in finishing passes,
• wherein, after the finish rolling of the respective first flat rolling stock, a first thickness wedge present in the finish-rolled respective first flat rolling stock is detected by measurement,
• wherein the first thickness wedge present in the finish-rolled respective first flat rolling stock is compared with a first target wedge,
• wherein based on a deviation of the existing first thickness wedge of the first target wedge and the first wedge adjustment a new first wedge position for the at least one roughing pass is determined, and
• wherein the first wedge position in the at least one roughing pass is set for the next flat first rolling stock to be rolled according to the newly determined value of the first wedge adjustment, so that the first flat rolled stock to be rolled next in the at least one roughing pass has the newly determined value of first wedge adjustment is pre-rolled.

The present invention further relates to a control program for a control device of a rolling mill, wherein the control program comprises machine code, which can be processed by the control device, wherein the processing of the machine code caused by the control device, that the control device operates the rolling mill according to such an operating method.

The present invention further relates to a control device of a rolling mill, wherein the control device is programmed with such a control program.

• wobei die Walzanlage einen ersten Zuführweg aufweist, über den einer Anzahl von Walzgerüsten der Walzanlage nacheinander mehrere erste flache Walzgüter aus Metall zugeführt werden,
• wobei die Walzanlage eine Anzahl von Walzgerüsten aufweist, mittels derer die ersten flachen Walzgüter gewalzt werden,
• wobei das jeweilige erste flache Walzgut in der Anzahl von Walzgerüsten zunächst in mindestens einem Vorwalzstich mit einer ersten Keilanstellung vorgewalzt wird und sodann in Fertigstichen fertiggewalzt wird,
• wobei die Walzanlage eine Dickenmesseinrichtung aufweist, mittels derer nach dem Fertigwalzen des jeweiligen ersten flachen Walzguts ein im fertiggewalzten jeweiligen ersten flachen Walzgut vorhandener erster Dickenkeil messtechnisch erfasst wird.

The present invention further relates to a rolling mill,

• wherein the rolling mill has a first feed path via which a plurality of rolling stands of the rolling mill are successively supplied with a plurality of first flat rolled metal goods,
• wherein the rolling mill comprises a number of rolling stands by means of which the first flat rolled goods are rolled,
• wherein the respective first flat rolling stock in the number of rolling stands is first rough-rolled in at least one roughing pass with a first wedge setting and then finish-rolled in finishing passes,
• wherein the rolling mill has a thickness measuring device, by means of which, after the finish rolling of the respective first flat rolling stock, a first thickness wedge present in the finish-rolled respective first flat rolling stock is detected metrologically.

A quality feature when rolling flat rolled stock is the size of a wedge, i. an asymmetric thickness distribution of the flat rolled material over the width of the flat rolled material seen. As a rule, a thickness wedge is undesirable.

To avoid or eliminate a thickness wedge, various approaches are known.

For example, from the JP H11-010 215 A the above-mentioned objects are known.

From the WO 2006/063 948 A1 is an operating method for a rolling mill with at least one rolling stand for rolling a Bandes in several rolling operations known. In the context of this method of operation, a computer determines mill stand settings for each rolling process on the basis of a rolling mill model for each rolling process, based on input parameters of the strip expected for this rolling operation, and transmits these settings to the mill stand performing this rolling operation. The rolling stand adjusts according to the transmitted settings and rolls the belt accordingly. As part of the rolling mill model, the computer also determines an outlet-side thickness wedge expected during this rolling process. By means of a measuring device dependent on the actual outlet side thickness wedge of the tape measured variable is detected and transmitted to the computer. On the basis of the measured variable and the expected outlet-side thickness wedge, the computer adapts the model of the rolling train. As a rule, one of the input parameters is an inlet-side thickness wedge expected during the respective rolling process.

From the WO 2012/159 849 A1 Also, an operating method for a rolling mill with at least one rolling stand for rolling a strip is known. In this operating method, a control computer for the rolling mill is given framework parameters which describe the rolling stand. Within the scope of a passplan calculation, the control computer sets quantities which describe the rolling of the flat rolling stock in the rolling mill stand. The sizes used, in conjunction with the framework parameters and sizes describing the flat stock prior to rolling in the mill stand, describe the nip and its asymmetry that results from rolling the stock in the mill. As part of the stitch plan calculation, the control computer determines a discharge-side thickness wedge and / or a discharge-side saber by means of a model of the rolling train, which are expected for the flat rolling stock during rolling in the rolling mill stand. The control computer is given a wedge strategy from the outside, ie criteria by means of which the control computer can determine what the outlet-side thickness wedge should be. Determined according to the wedge strategy the control computer optimized control variables for the rolling stand.

From the WO 2006/119 984 A1 is a method for hot rolling of slabs known, wherein the slabs are rolled in at least one roughing to Vorbändern. In this method, the Vorbandgeometrie is specifically influenced to reshape a saber or wedge slab in a straight and wedge-free Vorband. As part of this process, side guides are arranged in front of and behind the roughing stand, which can be employed on the rolling stock and by means of which transverse forces are exerted on the rolling stock in order to prevent the formation of a saber in the rolling stock.

especially the WO 2006/119 984 A1 represents an advance since, according to the doctrine of WO 2006/119 984 A1 at least a straight and wedge-free opening band can be generated. The doctrine of WO 2006/119 984 A1 But only leads to a significant success, if not for other reasons in the finishing line the straight and wedge-free opening band again a wedge and / or a saber are imprinted.

From the WO 2013/174 602 A1 is an additional embodiment of the doctrine of WO 2006/119 984 A1 known, in which the side guides additionally have a roller which can be made in the transverse direction of the rolling stock, so that by means of the roller, a transverse force can be exerted on the rolling stock.

From the WO 2009/016086 A1 It is known to influence the wedging of a Vorbandes while maintaining the Saber freedom during rough rolling by using upsets in conjunction with the rough rolling.

The object of the present invention is to provide opportunities by means of which avoided in a simple manner, a thickness wedge in finish-rolled flat rolling or can at least be reduced, at the same time a saber formation should be avoided.

The object is achieved by an operating method with the features of claim 1. Advantageous embodiments of the operating method according to the invention are the subject of the dependent claims 2 to 4.

• dass während des Vorwalzens des jeweiligen ersten flachen Walzguts in dem den mindestens einen Vorwalzstich ausführenden Walzgerüst vor und/oder hinter diesem Walzgerüst Seitenführungen und/oder Staucher an das Walzgut angestellt werden,
• dass die Seitenführungen und/oder Staucher Querkräfte auf das jeweilige erste flache Walzgut ausüben, welche eine Säbelbildung beim Vorwalzen verhindern, und
• dass eine Änderung der ersten Keilanstellung zumindest bis zu einem bestimmten Grenzwert der Änderung der ersten Keilanstellung proportional zur Abweichung des im fertiggewalzten jeweiligen ersten flachen Walzgut vorhandenen ersten Dickenkeils vom ersten Zielkeil ist.

According to the invention, an operating method of the initially mentioned type is configured by

• in that during the pre-rolling of the respective first flat rolling stock in the rolling stand executing the at least one rough-rolling pass before and / or behind this rolling stand, side guides and / or stufferers are set against the rolling stock,
• that the side guides and / or upsets exert lateral forces on the respective first flat rolling stock, which prevent saber formation during rough rolling, and
• a change in the first wedge adjustment, at least up to a certain limit value of the change in the first wedge position, is proportional to the deviation of the first thickness wedge present in the finish-rolled respective first flat rolling stock from the first target wedge.

The present invention is thus based, first, on the knowledge that it is irrelevant whether there is a thickness wedge deviating from the target wedge in intermediate stages, for example in the opening band. It is only decisive that the target wedge is achieved in the final product, ie in the flat rolling stock after finish rolling. On the other hand, the present invention is based on the finding that in the event that the thickness wedge deviates from the target wedge, this deviation for the next, not yet rolled flat rolling stock can be counteracted by appropriate adjustment of the roll stand during rough rolling. In this case, no elaborate modeling of the rolling process is required. It is sufficient if the deviation of the thickness wedge from the target wedge tends to be counteracted. This is ensured by the procedure according to the invention.

Although the procedure according to the invention presupposes that the results, in particular the resulting thickness wedge, can be reproduced from rolling stock to rolling stock. However, this is the case in practice, at least within uniform flat rolled goods. This often applies even if wedge adjustments are made during finish rolling during the respective finishing passes. Such Keilanstellungen can be made for example manually by an operator of the rolling mill to make the tape low. Because the decisive factor is only the reproducibility of the thickness wedge, which is still given in this case.

The first target wedge may be determined as needed. Often, the first target wedge will be zero. However, it is also possible that the first target wedge has a value other than zero.

It is preferably provided that the change in the first wedge setting increases monotonically with the ratio of a mean rolling stock thickness of the respective first flat rolled stock after roughing and after finish rolling. This makes it possible to track the first wedge adjustment even if different Endwalzdicken to be rolled.

It is preferably provided that a RAC takes place during the rolling of the respective first flat rolling stock. The term "RAC" stands for "roll alignment control". Roll alignment control means that during rolling, reaction is made to differential rolling forces that occur between the operating side and the drive side and / or lateral migration of the rolling stock. As part of the roll alignment control, an additional wedge adjustment of the corresponding roll stand is determined in order to counteract the differential rolling forces and / or the migration of the rolling stock. The roll alignment control will take effect during the respective rolling process.

When rolling flat rolled stock, in some cases, the number of rolling stands in addition to the first flat rolled goods are successively supplied with a second second flat rolling stock via a second feeding path. For example, a multi-stand finishing train with upstream roughing slabs can be supplied on the one hand directly from a continuous casting plant and on the other hand from a further continuous casting plant and / or via a slab bearing. In such a case, the second flat rolled goods are also rolled by the number of rolling stands. Here, analogously to the first flat rolled products, the respective second flat rolled stock in the number of rolling stands is first pre-rolled in at least one roughing pass with a second wedge setting and then finish-rolled into finishing passes. Again, after the finish rolling of the respective second flat rolling stock, a second thickness wedge present in the finish-rolled respective second flat rolling stock is detected by measurement. Furthermore, the second thickness wedge is here compared with a second target wedge and determined on the basis of a deviation of existing in finish-finished second flat rolling stock second thickness wedge of the second target wedge and the second wedge adjustment a new second wedge position for the at least one roughing pass. Finally, here too the second wedge adjustment is set in the at least one roughing pass for the second flat rolling stock to be rolled next according to the newly determined value of the second wedge setting, so that the second flat rolling stock to be rolled next in the at least one roughing pass with the newly determined one Value of the second wedge adjustment is pre-rolled. Due to the separate treatment of the first rolling stock and the respective change of the wedge adjustment determined on the one hand and the second rolling stock and the respective change of the wedge adjustment determined for these rolling goods, the optimum wedge adjustments can be achieved be determined separately for the first and second rolled goods.

The second target wedge may be determined as needed. Often the second target wedge will have the value zero, analogous to the first target wedge. However, again analogous to the first target wedge, it is also possible for the second target wedge to have a value other than zero.

With regard to the second rolling goods, of course, the advantageous embodiments are possible, which are possible with respect to the first rolling stock.

The procedure can also be extended to other delivery routes.

The object is further achieved by a control program having the features of claim 5. According to the invention, a control program of the type mentioned above is configured in that the processing of the machine code by the control device causes the control device to operate the rolling mill in accordance with an operating method according to the invention.

The object is further achieved by a control device with the features of claim 6. According to the invention, a control device of the type mentioned above is programmed with a control program according to the invention.

• dass die Walzanlage vor und/oder hinter dem den mindestens einen Vorwalzstich ausführenden Walzgerüst Seitenführungen und/oder Staucher aufweist, die während des Vorwalzens des jeweiligen ersten flachen Walzguts an dieses Walzgerüst angestellt werden und Querkräfte auf das jeweilige erste flache Walzgut ausüben, welche eine Säbelbildung beim Vorwalzen verhindern, und
• dass die Walzanlage eine erfindungsgemäße Steuereinrichtung aufweist, welche die Walzanlage gemäß einem erfindungsgemäßen Betriebsverfahren betreibt.

The object is further achieved by a rolling mill with the features of claim 7. According to the invention, a rolling mill of the type mentioned is configured by

• in that the rolling mill has side guides and / or upsweeters in front of and / or behind the rolling stand which carries out the at least one roughing pass, which are set against this rolling stand during roughing of the respective first flat rolled stock and lateral forces on the respective first flat To exert rolling, which prevent saber formation during roughing, and
• that the rolling mill has a control device according to the invention, which operates the rolling mill according to an operating method according to the invention.

FIG 1

eine Walzanlage,

FIG 2

einen Walzspalt eines Vorgerüsts,

FIG 3

einen Querschnitt durch ein flaches Walzgut,

FIG 4

einen Abschnitt der Walzanlage von oben und

FIG 5

eine weitere Walzanlage.

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

FIG. 1

a rolling mill,

FIG. 2

a nip of a roughing stand,

FIG. 3

a cross section through a flat rolling stock,

FIG. 4

a section of the rolling mill from above and

FIG. 5

another rolling mill.

FIG. 1 shows an embodiment of a rolling mill, in which a single roughing stand 1 and several finishing stands 2 - usually between four and seven finishing stands 2 - are present. At least the finishing stands 2 are passed through flat rolling stock 3 in succession. The flat rolled goods 3 are rolled in the finishing stands 2 each in a single rolling pass (finish stitch). The flat rolled goods 3 are made of metal, for example steel or aluminum. However, other metals are possible, such as copper.

In the embodiment according to FIG. 1 Thus, each finishing stand 2 performs a single roll pass. It is possible that the roughing stand 1 reversingly performs several rolling passes (Vorwalzstiche). In connection with this frequently encountered embodiment - that is, a single roughing stand 1 and several finishing stands 2 are present, the roughing stand 1 performs reversing multiple rolling passes and each finishing stand 2 executes a single rolling pass - is the present Invention explained below. However, the present invention is not limited to this embodiment.

Thus, for example, several roughing scaffolds 1 may be present, which are passed through in succession by the flat rolled goods 3. In this case, it is possible for each roughing stand 1 to execute one roughing pass each. Alternatively, in this case, too, the roughing stands 1 can be reversed several times by the flat rolled goods 3. Also, in individual cases, a single roughing stand 1 could be present, which is traversed by the flat rolling stock 3 in a single roll pass. In both cases, the finished scaffolds 2 would continue to be passed successively by the flat rolling stock 3, with each finishing scaffold 2 each performing a single rolling pass. Furthermore, it is possible that in the case of several roughing passes per respective flat rolling stock 3, the respective flat rolling stock 3 is not rolled in individual ones of the roughing passes, that is, it is not reduced in thickness.

But it is also possible that a total of only one rolling mill is present, which is repeatedly reversed by the flat rolling stock 3. In this case, all rolling passes - ie both the pre-stitches and the finished stitches - would be carried out from one and the same rolling stand.

The rolling stands 1, 2, the flat rolled goods 3 are successively fed via a Zuführweg 4. The Zuführweg 4 may be formed, for example, as a continuous casting with downstream compensation furnace. Alternatively, the Zuführweg 4 may be designed as a ferry with downstream furnace (for example, a tunnel furnace). Also, the Zuführweg 4 may be formed as a slab store with downstream furnace. Other embodiments are possible.

gegeben ist. sDS und sOS sind in Gleichung 1 der Walzspalt sDS an der Antriebsseite und der Walzspalt sOS an der Bedienseite des Vorgerüsts 1. Die Keilanstellung ds ist in FIG 2 aus Gründen der besseren Veranschaulichung deutlich übertrieben dargestellt.After feeding one of the flat rolled goods 3 to the first rolling mill 1 of the rolling mill - according to the embodiment of FIG. 1 So after feeding to the Vorgerüst 1 - is the respective flat rolling stock 3 in the rolling stands 1, 2 in each rolling passes (reversing the Vorgerüst 1 in several Vorwalzstichen, in the finishing stands 2 in a respective finish stitch) first pre-rolled and then finish rolled. In particular, the rough rolling in the roughing stand 1 takes place with a wedge setting ds of the roughing stand 1. The roughing stand 1 is thus adjusted during the respective roughing pass such that the rolling gap s of the roughing stand 1 as shown in FIG FIG. 2 Seen over the width b of the roughing stand 1 extends wedge-shaped. The nip s of the roughing stand 1 thus has a wedge engagement ds, wherein the wedge engagement ds by the relationship $$\mathrm{ds}=\mathrm{SDS}-\mathrm{SOS}$$

given is. In equation 1 sDS and sOS are the rolling gap sDS on the drive side and the rolling gap sOS on the operating side of the roughing stand 1. The wedge engagement ds is in FIG. 2 clearly exaggerated for better illustration.

The wedge adjustment ds can be the same for all roughing passes. Alternatively, the wedge adjustment ds can be determined individually from roughing pass to roughing pass. For example, the wedge setting ds of the respective roughing pass can be correlated with the outlet-side desired thickness of the respective roughing pass, in particular be proportional to the outlet-side desired thickness of the respective roughing pass. Other approaches are possible.

After performing the roughing passes, the finished stitches are executed. The respective flat rolling stock 3 is therefore finish-rolled in the finishing stands 2 in the finishing passes. If necessary, the finished scaffold 2 can be acted upon during the execution of the respective finishing stitch - for example in the context of roll alignment control - with a respective wedge adjustment.

gegeben. dDS und dOS sind in Gleichung 2 die Walzgutdicke dDS an der Antriebsseite und die Walzgutdicke sOS an der Bedienseite des flachen Walzguts 3 auslaufseitig des den letzten Fertigstich ausführenden Fertiggerüsts 2. Der Dickenkeil dd ist in FIG 3 - analog zur Keilanstellung ds - aus Gründen der besseren Veranschaulichung deutlich übertrieben dargestellt. Es ist ebenso möglich, den Dickenkeil dd anhand anderer Größen zu bestimmen. Beispielsweise ist es üblich, die Walzgutdicken dDS und dOS nicht unmittelbar an den Seitenrändern des flachen Walzguts 3 zu messen, sondern in einem Abstand von den Seitenrändern. Der Abstand kann beispielsweise 25 mm oder 40 mm betragen. Auch ein anderer sinnvoller Wert kann als Abstand von den Seitenrändern herangezogen werden. Auch ist es möglich, die Walzgutdicke an mehreren Stellen über die Walzgutbreite zu erfassen und anhand der erfassten Walzgutdicken beispielsweise eine parametrisierte Beschreibung der Walzgutdicke als Funktion des Ortes in Breitenrichtung gesehen zu optimieren. In diesem Fall kann einer der Parameter der parametrisierten Beschreibung, der für die Asymmetrie der Walzgutdicke charakteristisch ist, zur Ermittlung des Dickenkeils dd herangezogen werden. Auch andere Vorgehensweisen sind möglich.The finished scaffolding 2 - more precisely: the finishing screed 2 executing the last finishing pass - is followed by a thickness measuring device 5. By means of the thickness measuring device 5, after the finish rolling of the respective flat rolling stock 3, a thickness wedge dd, which is present in the finish-rolled respective flat rolling stock 3, is measured. The thickness wedge dd is according to FIG. 3 - Analogous to the wedge ds - for example, by the relationship $$\mathrm{dd}=\mathrm{DDS}-\mathrm{DOS}$$

given. dDS and dOS in equation 2 are the rolling stock thickness dDS on the drive side and the rolling stock thickness sOS on the operating side of the flat rolled stock 3 on the outgoing side of the final finishing stitch finishing screed 2. The thickness key dd is in FIG. 3 - Analogously to the wedge ds - for reasons of better illustration clearly exaggerated. It is also possible to determine the thickness wedge dd on the basis of other variables. For example, it is common to measure the rolling stock thickness dDS and dOS not directly on the side edges of the flat rolled stock 3, but at a distance from the side edges. The distance may be 25 mm or 40 mm, for example. Another meaningful value can be used as a distance from the page margins. It is also possible to detect the rolled stock thickness at several points over the rolling stock width and, based on the detected rolling stock thickness, to optimize, for example, a parameterized description of the rolling stock thickness as a function of the location in the width direction. In this case, one of the parameters of the parameterized description, which is characteristic for the asymmetry of the rolling stock thickness, can be used to determine the thickness wedge dd. Other approaches are possible.

The thickness measuring device 5 is according to FIG. 1 connected to a control device 6 data technology. The control device 6 is programmed with a control program 7. The control program 7 comprises machine code 8 supplied by the control device 6 is workable. The processing of the machine code 8 by the control device 6 causes the control device 6 to operate the rolling mill according to the operating method described above and also explained below. In particular, the control device 6 controls the rolling stands 1, 2 and the transport of the flat rolled goods 3 through the rolling mill. Preferably, the controller 6 continues to perform a RAC during rolling of the respective flat rolled stock 3.

erfolgen. Die neu ermittelte Keilanstellung ds gilt für das als nächstes zu walzende flache Walzgut 3. Das als nächstes zu walzende flache Walzgut 3 wird also in dem Vorwalzstich - allgemein: in dem mindestens einen Vorwalzstich - mit der neuen Keilanstellung ds - beispielsweise gemäß Gleichung 3 - vorgewalzt.As part of processing the machine code 8, the control device 6 receives its measured values from the thickness measuring device 5, in particular the thickness wedge dd or the rolling stock thicknesses dDS, dWS on the drive side and the operating side. Based on the deviation of the thickness wedge dd of a target wedge dZ, optionally with additional utilization of other variables such as the wedge ds and / or a Walzgutbreite, determines the controller 6 a change dds of the wedge engagement ds. Then, the controller 6 changes the wedge position ds by the change dds of the wedge engagement ds. The control device 6 thus determines a (new) wedge engagement ds. For example, a determination according to the relationship $$\mathrm{ds}=\mathrm{ds}+\mathrm{dds}$$

respectively. The newly determined wedge engagement ds applies to the flat rolling stock 3 to be rolled next. The flat rolling stock 3 to be rolled next is therefore pre-rolled in the roughing pass - generally: in the at least one roughing pass - with the new wedge setting ds, for example according to Equation 3 ,

The purpose of the explained procedure is that for the next rolled flat rolling stock 3, the deviation of the thickness wedge dd from the target wedge dZ has at least a smaller value than for the last already rolled flat rolled stock 3. In the optimal case, the thickness wedge dd is the next rolled flat rolled stock 3 even equal to the target wedge dZ. The control device 6 therefore determines the change dds of the wedge engagement ds such that the change dds of the wedge engagement ds counteracts the deviation.

In the simplest case, the control device 6 determines the change dds of the wedge engagement ds according to the relationship $$\mathrm{dds}=\mathrm{k}\left(\mathrm{dd}-\mathrm{dZ}\right)$$

In the simplest case, therefore, the change dds of the wedge engagement ds is proportional to the deviation of the thickness wedge dd of the target wedge dZ present in the finish-rolled respective flat rolling stock 3. k is a proportionality factor chosen according to magnitude and sign.

k' ist in Gleichung 5 ein weiterer, von den beiden Walzgutdicke D, d unabhängiger Proportionalitätsfaktor.Furthermore, with the same deviation of the thickness wedge dd from the target wedge dZ, the change dds of the wedge engagement ds increases monotonically with the ratio of a mean rolling stock thickness D, d of the respective flat rolled stock 3 after the rough rolling and after the finish rolling. D is here the average rolling stock thickness of the respective flat rolling stock 3 after the rough rolling, d the average rolling stock thickness after the finish rolling. In the simplest case, there is a simple proportionality ratio. In this case, the proportionality factor k is added $$\mathrm{k}=\mathrm{k}\text{'}D/\mathrm{d}$$

k 'is in Equation 5 another, proportional to the two rolling stock D, d proportionality factor.

A combination of equations 4 and 5 thus gives - see also FIG. 1 - the relationship $$\mathrm{dds}=\mathrm{k}\text{'}D\left(\mathrm{dd}-\mathrm{dZ}\right)/\mathrm{d}$$

To implement the last-mentioned procedure, ie the monotonous increase of the change dds of the wedge engagement ds with the ratio of the average rolling stock D, d of the respective flat rolled stock 3 after roughing and after finish rolling, it is necessary that the two Walzgutdicken D, d the control device 6 are known. With regard to the average rolling stock thickness D of the respective flat rolling stock 3 after rough rolling, the control device 6 may be aware of this rolling stock thickness D, for example due to the setting of the roughing stand 1 during the execution of the last roughing pass of the respective flat rolled stock. With regard to the average rolling stock thickness d of the respective flat rolling stock 3 after the finish rolling, preferably a detection by the thickness measuring device 5 or another, in FIG FIG. 1 not shown further thickness measuring device.

According to the invention, the above in connection with the 1 to 3 explained the procedure accordingly FIG. 4 modified.

According to FIG. 4 the rolling mill additionally has side guides 9. The side guides 9 are according to FIG. 4 arranged in front of and behind the roughing stand 1. The side guides 9 are made during the pre-rolling of the flat rolled material 3 to the sides of the flat rolled material 3. The side guides 9 exert on the input side and on the output side transverse forces FE, FA on the flat rolling stock 3. The transverse forces FE, FA prevent both the inlet side and outlet side saber formation of the flat rolled stock 3 during roughing. The side guides 9, as shown in FIG FIG. 4 be elongated. Alternatively or additionally, the side guides 9 - analogous to that in the WO 2013/174 602 A1 described procedure - have a role or a similar element which can be made in the transverse direction to the respective flat rolling stock 3, so that by means of the roller, a transverse force can be exerted on the respective flat rolling stock 3.

In the embodiment according to FIG. 4 1 side guides 9 are arranged both before and behind the roughing stand. In individual cases it may be sufficient to arrange a side guide 9 only in front of or behind the roughing stand 1. The other side guide 9 is not available in this case. Furthermore, it is possible to replace the front and / or the rear side guide 9 - regardless of whether the respective other side guide 9 is present or not - by a stuffer.

The embodiment of the rolling mill according to FIG. 5 corresponds over long distances with the design of the rolling mill according to FIG. 1 , According to FIG. 5 However, the rolling mill not only the Zuführweg 4, but additionally a further Zuführweg 10. The two Zuführwege 4, 10 are hereinafter referred to as the first Zuführweg 4 and second Zuführweg 10. Also via the second Zuführweg 10, the number of rolling stands 1, 2 successively a plurality of flat rolling stock 11 is supplied. The flat rolling stock 3, 11 fed to the rolling stands 1, 2 via the respective feed path 4, 10 are referred to below as first flat rolled goods 3 and second flat rolled goods 11.

The second flat rolled goods 11 are rolled in the rolling mill in a completely analogous manner as the first rolled goods 3. In particular, the second flat rolled goods 11 are rolled by means of the number of rolling stands 1, 2, wherein the respective second flat rolling stock 11 is pre-rolled by means of the number of rolling stands 1, 2 first in at least one roughing pass with a respective second wedge setting ds and then in finishing passes finish rolled.

Furthermore, after the finish rolling of the respective second flat rolling stock 11, a second thickness wedge dd present in the finish-rolled respective second flat rolling stock 11 is also metrologically detected for the second flat rolled goods 11 and supplied to the control device 6. The control device 6 compares the second thickness wedge dd with a second one Target wedge dZ and determined for the respective second flat rolling stock 11 based on the deviation of the second thickness wedge dd from the second target wedge dZ and the second wedge ds a new second wedge ds for the at least one roughing pass. The determination can be made in a completely analogous manner as for the first flat rolled goods 3. In this way, as for the first flat rolled products 3 also, the second wedge adjustment ds is changed in the at least one roughing pass for the second flat rolling stock 11 to be rolled next. The second flat rolling stock 11 to be rolled next is thus pre-rolled in the at least one roughing pass with the new value of the second wedge setting ds.

The decisive fact is thus that the determination of the new wedge adjustment ds and, associated therewith, the tracking of the wedge adjustment ds for the first and second flat rolled products 3, 11 takes place independently of one another. Therefore, even if the first and second flat rolled goods 3, 11 have completely different properties (for example, different chemical compositions, different temperatures, different widths, different rolling stock thicknesses before roughing, etc.), reliable tracking of the respective wedge attitude ds may be next for Rolling respective flat rolling 3, 10 take place.

The distinction between the first supply path 4 and the second supply path 10 may be made as needed. In individual cases, it is even possible that the flat rolled products 3, 11 originate from the same source - for example, from a common slab store - but before they are fed to the rolling mill, they pass different paths, for example different furnaces.

The present invention stands out above all for its simplicity. Because no complex modeling of the rolling mill is required. Furthermore, there is no detection of a Any thickness wedge in the rolling stock 3, 11 before the rough rolling or between the rough rolling and the finish rolling required. It is only necessary, after the finish rolling, to grasp the thickness wedge dd then present in the rolling stock 3, 11 and to track the wedge setting ds of the at least one roughing pass on the basis of this thickness wedge dd.

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

Claims (7)

1. Operating method for a rolling mill,

   - wherein several first flat items of rolling stock (3) made of metal are fed in succession to a number of roll stands (1, 2) of the rolling mill via a first feed path (4),

   - wherein the first flat items of rolling stock (3) are rolled by means of the number of roll stands (1, 2),

   - wherein the respective first flat item of rolling stock (3) is firstly roughed down in the number of roll stands (1, 2) in at least one roughing pass with a first wedge setting (ds) and is then finish-rolled in finishing passes,

   - wherein after the finish-rolling of the respective first flat item of rolling stock (3) a first thickness wedge (dd) existing in the finish-rolled respective first flat item of rolling stock (3) is registered by applied metrology,

   - wherein the first thickness wedge (dd) existing in the finish-rolled respective first flat item of rolling stock (3) is compared with a first target wedge (dZ),

   - wherein on the basis of a deviation of the existing first thickness wedge (dd) from the first target wedge (dZ) and from the first wedge setting (ds) a new first wedge setting (ds) for the at least one roughing pass is ascertained and

   - wherein the first wedge setting (ds) in the course of the at least one roughing pass is adjusted, in accordance with the newly ascertained value of the first wedge setting (ds), for the first flat item of rolling stock (3) to be rolled next, so that the first flat item of rolling stock (3) to be rolled next is roughed down in the at least one roughing pass with the newly ascertained value of the first wedge setting (ds),

   characterized

   - in that, during the roughing down of the respective first flat item of rolling stock (3) in the roll stand (1) carrying out the at least one roughing pass, lateral guides (9) and/or edgers are placed against the rolling stock (3) in front of and/or behind this roll stand (1),

   - in that the lateral guides (9) and/or edgers exert transverse forces (FE, FA) on the respective first flat item of rolling stock (3), which prevent a saber-type formation in the course of roughing down, and

   - in that a change (dds) of the wedge setting (ds) is proportional to the thickness wedge (dd) existing in the finish-rolled respective first flat item of rolling stock (3) .
2. Operating method according to Claim 1,
   characterized
   in that the change (dds) of the wedge setting (ds) increases monotonically with the ratio of a mean rolling-stock thickness (D, d) of the respective first flat item of rolling stock (3) after the roughing down and after the finish-rolling.
3. Operating method according to one of the above claims, Characterized in that a roll alignment control is undertaken during the rolling of the respective first flat item of rolling stock (3).
4. Operating method according to one of the above claims, characterized

   - in that several second flat items of rolling stock (11) are fed in succession to the number of roll stands (1, 2) via a second feed path (10),

   - in that the second flat items of rolling stock (11) are rolled by means of the number of roll stands (1, 2),

   - in that the respective second flat item of rolling stock (11) is firstly roughed down by means of the number of roll stands (1, 2) in at least one roughing pass with a second wedge setting (ds) and is then finish-rolled in finishing passes,

   - in that after the finish-rolling of the respective second flat item of rolling stock (11) a second thickness wedge (dd) existing in the finish-rolled respective second flat item of rolling stock (11) is registered by applied metrology,

   - in that the thickness wedge (dd) existing in the finish-rolled respective second flat item of rolling stock (11) is compared with a second target wedge (dZ),

   - in that on the basis of a deviation of the existing second thickness wedge (dd) from the second target wedge (dZ) and from the second wedge setting (ds) a new second wedge setting (ds) for the at least one roughing pass is ascertained and

   - in that the second wedge setting (ds) in the course of the at least one roughing pass for the second flat item of rolling stock (11) to be rolled next is adjusted in accordance with the newly ascertained value of the second wedge setting (ds), so that the second flat item of rolling stock (11) to be rolled next is roughed down in the at least one roughing pass with the newly ascertained value of the second wedge setting (ds).
5. Control program for a control device (6) of a rolling mill, wherein the control program comprises machine code (8) that can be executed by the control device (6), wherein the execution of the machine code (8) by the control device (6) causes the control device (6) to operate the rolling mill in accordance with an operating method according to one of the above claims.
6. Control device of a rolling mill, wherein the control device has been programmed with a control program (7) according to Claim 5.
7. Rolling mill,

   - wherein the rolling mill exhibits a first feed path (4), via which several first flat items of rolling stock (3) made of metal are fed in succession to a number of roll stands (1, 2) of the rolling mill,

   - wherein the rolling mill exhibits a number of roll stands (1, 2), by means of which the first flat items of rolling stock (3) are rolled,

   - wherein the respective first flat item of rolling stock (3) is firstly roughed down in the number of roll stands (1, 2) in at least one roughing pass with a first wedge setting (ds) and is then finish-rolled in finishing passes,

   - wherein the rolling mill exhibits a thickness-measuring device (5), by means of which, after the finish-rolling of the respective first flat item of rolling stock (3), a first thickness wedge (dd) existing in the finish-rolled respective first flat item of rolling stock (3) is registered by applied metrology,

   characterized in that

   - wherein the rolling mill exhibits, in front of and/or behind the roll stand (1) carrying out the at least one roughing pass, lateral guides (9) and/or edgers which during the roughing down of the respective first flat item of rolling stock (3) are placed against this roll stand (1) and exert transverse forces (FE, FA) on the respective first flat item of rolling stock (3), which prevent a saber-type formation in the course of roughing down, and

   - in that the rolling mill exhibits a control device (6) according to Claim 6, which operates the rolling mill in accordance with an operating method according to one of Claims 1 to 5.

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