WO2019170381A1

WO2019170381A1 - Preventing worn edges when rolling flat rolled products

Info

Publication number: WO2019170381A1
Application number: PCT/EP2019/053618
Authority: WO
Inventors: Andrea Schmidt; Alexander Thekale
Original assignee: Primetals Technologies Germany Gmbh
Priority date: 2018-03-09
Filing date: 2019-02-14
Publication date: 2019-09-12
Also published as: EP3536411B1; US20210046529A1; CN111801173A; CN111801173B; EP3536411A1

Abstract

The invention relates to a roll stand (1) having at least one pair of rollers (4, 5) between which the flat rolled product (2) is located. The rollers (4, 5) can be moved axially in opposite directions. The roll stand (1) additionally has a bending system (6) for the rollers (4, 5). A controller (8) of the roll stand (1) uses the bending and the axial movement of the rollers (4, 5) in order to regulate the roll gap contour as an adjustment mechanism. Prior to rolling a respective rolled product (2), the controller determines a respective axial position (x) as the resulting axial position (x) and sets the axial position as the axial position (x) of the rollers (4, 5) for the roll stand (1) in order to roll the next flat rolled product (2). For this purpose, the controller (8) ascertains how far a specified target roll gap contour can be approximated for a plurality of axial positions (x) of the rollers (4, 5) by actuating the adjustment mechanism (6, 7) while taking into consideration technological boundary conditions and classifies the axial positions (x) at which a deviation of the resulting roll gap contour from the target roll gap contour lies below a specified limit as being permissible. The controller then removes the axial positions (x) excluded from the plurality of axial positions (x) classified as being permissible as long as at least one axial position (x) classified as being permissible still remains after the excluded axial positions (x) are removed. The controller (8) determines one of the remaining axial positions (x) as the resulting axial position (x).

Description

description

Name of the invention

Avoiding wear edges when rolling flat roll well

Field of engineering

The present invention is based on a method for rolling a flat rolled stock in a roll stand, wherein the roll stand has at least one pair of rolls, wherein the flat rolled material is located between the two rolls, where the rolls are axially displaceable in opposite directions, wherein the rolling stand a Bending system for the rollers,

wherein a control device of the roll stand for controlling the roll gap contour as adjusting mechanisms, the bending and the axial displacement of the rollers,

- Wherein the control device before rolling a respective rolling determines a respective axial position as a resultant axial position and the rolling stand as the axial position of the rollers for rolling the next flat rolled material before.

The present invention is further based on a control program for a control device for controlling a rolling stand, the control program comprising machine code that can be executed by the control device, wherein the processing of the machine code by the control device causes the control device to carry out such a method ,

The present invention is further based on a control device for a rolling stand, wherein the control device is designed in such a way that it carries out such a method during operation, in particular with such a control program. The present invention is further based on a rolling stand for rolling a flat rolled stock,

wherein the roll stand has at least one pair of rolls,

the flat rolling stock being between the two rolls,

- wherein the rollers are axially displaceable in opposite directions,

- wherein the roll stand has a bending system for the rolls,

- The rolling mill is controlled by such a control device.

State of the art

From WO 2006/000 290 Al a method of the type mentioned ge is known. In this method, the bending of the rollers or the displacement of the rollers are cyclically vari iert.

Summary of the invention

The quality of the surface and the contour of the rolling stock transverse to the rolling direction are decisive parameters for a flat rolling stock. As a rule, further processing steps which take place after rolling make certain demands on the observance in particular of a desired contour of the flat rolled good, i. the thickness profile as a function of the width of the flat rolling stock.

An essential influencing factor for the contour of the flat rolled stock is the contour of the surfaces of the rolls of the rolling stand. This contour consists essentially of three Be constituents together, namely on the one hand, the roll grinding ei ner respective roller, on the other hand, the thermal expansion of the respective roller and finally the wear of each respective roller. In particular, the wear on the rolling stock edge of the strip (ie at the edges of the flat rolled stock) often leads to step-like patterns in the roll surface. Therefore, measures must often be taken to prevent avoid that such steps are embossed into the flat rolling.

In the prior art, various approaches are known be to avoid a stamping such stages in the flat roll well.

In the simplest case, the production is adjusted. In this case, a few rolls are first rolled in the course of a roll trip, which are gradually wider. The Wal zen these rolled goods is used to warm up the roller. Thereafter, only rolled goods are rolled, whose width gradually decreases. This procedure is known in professional circles as so-called coffin lid driving. It has the advantage that the flat rolled goods can be rolled between the wear edges of their predecessors.

Another approach is to mechanically abrade the wear edges during the rolling process. Such a process is known, for example, from WO 2006/059 667 A1.

Another approach is to smear the wear edge characterized in that the corresponding rollers currency end of the rolling process - are moved axially - in particular between the rolling of successively rolled rolling stock. This procedure is generally known for "normal" rolls which have a substantially cylindrical roll grinding, but WO 2006/000 290 A1 discloses this approach for rolls which are provided with a flange-like curved contour.

The well-known from WO 2006/000 290 Al approach is already an advance over a procedure in which the displacement of the rolls for rolling a certain flat rolled material without taking into account the displacement advertising of the rolls during rolling of previously rolled flat rolled goods is determined , However, the procedure known from WO 2006/000 290 A1 can also be improved. In particular, in the case of the procedure known from WO 2006/000 290 A1, too, an undesirable accumulation of wear can occur at those points of the rolls which lie in the region of the rolling stock edges.

The object of the present invention is to create possi possibilities, by means of which in particular the United wear in the direction of the axis of rotation of the rolls seen reliably distributed over a sufficiently large area who can and thus at the same time an accumulation of the wear at individual points of the rollers can be reliably counteracted.

The object is achieved by a method having the features of claim 1. Advantageous embodiments of the proceedings are the subject of the dependent claims 2 to 8.

According to the invention, a method of the type mentioned is configured by

- That the control device determines before rolling of the respective rolling stock for a plurality of axial positions of the rollers, how far can be approximated by controlling the adjusting mechanisms, taking into account technological constraints a pre-specified target roll gap contour,

- That the control device classifies those axial positions as permissible, in which a deviation of the erge ing roll gap contour of the desired roll gap contour is below half a predetermined barrier,

- That the control device ent from the set of axial positions classified as permissible locked ent removed, provided that after removal of the locked axial positions still remains at least one classified as permissible axial position, and

- That the controller determines the resulting axial position one of the remaining axial positions. It is possible that the rolling stand is a stand-up frame, that is to say a rolling stand in which, apart from the rolls mentioned, there are no further rolls. In the case, the rollers according to the invention are the work rolls of the rolling stand. In general, however, the rolling stand in addition to the rollers at least supporting rollers, wherein the rollers are each arranged between the support rollers and the rolling stock is. In this case, the rolling stand is usually a quarto scaffolding or a sexto scaffolding. A quarto scaffolding is a rolling stand with a total of four superimposed rolls. In this case, only backup rolls are present in addition to the inventive Shen rollers. Alternatively, it is possible, please include, that it is in the rolling stand to a hexagonal scaffolding han delt, so to a rolling mill, that in addition to the support rollers and the work rolls has two intermediate rollers, which are arranged beitswalzen between each of the support rollers and one of Ar. In this case, the rollers according to the invention may also be the work rolls of the rolling stand. Alternatively, it may be the inter mediate rolls. It is even possible in the case of a Sextogerüsts that both the work rolls and the intermediate rollers are axially displaceable, so that both the working rollers and the intermediate rollers rollers in the sense of the prior invention are.

It is possible that the rollers are provided with a cylindrical Kon structure. However, the present invention shows its full advantages when the rollers are provided with a bottle neck-like curved contour.

As part of the determination of the permissible axial positions be taken into account, the control device in particular technologi cal boundary conditions of the rolling stand. Such Randbedingun conditions are, for example, by the limits of Stellme mechanisms and determined by the maximum Verstellgeschwin speeds of the adjusting mechanisms. The setting limits of the setting mechanisms and the maximum possible adjustment speed This may be due to technical reasons or may be restricted by an operator according to the requirements.

The nip contour corresponds to the thickness of the flat rolled stock after rolling, spatially resolved over the bandwidth. The thickness of the flat rolling stock is determined over the Bandbrei te at least 5 points, better at least 10 points, for example, at 20 digits or more.

The manner in which the controller then determines the actual axial position taken from the remaining axial positions may be as needed.

For example, it is possible that the controller agrees the resulting axial position on a stochastic basis be. Already by this procedure is particularly avoided that - no matter for what reasons - certain axial positions are disproportionately often used and there is zen with wear in particular at the points of further Wal where the resulting rolling stock edges are when rolling the flat rolling stock.

Alternatively, it is possible that the control device at least the remaining axial positions on the basis of a Bewer rating criterion assigns a rating and that the control device determines the resulting axial position based on the Bewer device. As a result, the optimum axial position for rolling the respective flat rolling stock can be used in each case - in accordance with the evaluation. The control device can determine the evaluation in particular based on technological Krite rien.

The locking of axial positions can also be done as needed.

For example, it is possible for the control device to receive a blocking command from an operator and for the control device then to specify in the blocking command specified axial position. alpositionen locks. As a result, the operator is able, for example due to higher-level technological knowledge, which is not present in the control device, be certain adverse axial positions to lock.

As already mentioned, arise when rolling the flat rolling goods in the rollers wear edges. The location of these wear edges Ver the control device is usually known, because the control device is usually known, which flat rolling stock (with which width) at which axial position of the other rolls has already been rolled, ie where the United wear edges have arisen. In addition, it is possible to take into account as necessary the cut and the thermal crown of a respective roll. As a result, it is possible that the control device, taking into account a grinding, a thermal crowning and / or wear of the rollers determines a resultant edge of one of the rollers and locks those axial positions in which the resulting edge of one of the rollers on a Walzgutkante of flat rolling stock would be positioned.

Preferably, the control device further locks the gene axial positions whose distance are in a certain vorbe vorbe area around that axial position around, in which the immediately previously rolled flat rolled material is rolled. This ensures that when rolling several fla cher rolling the other rollers are positioned in a relatively large displacement area, so that the wear of the other rollers over a wide range of width of the other rollers is distributed. This increases the service life of the other rollers. In the simplest case, the vorbe-agreed range is symmetrical with respect to the axial position, in which the immediately previously rolled flat rolled material is rolled. In this case, the axial position at which the immediately previously rolled flat rolled material is rolled is in the middle of the predetermined range. The area can also be arranged asymmetrically. It is possible that the control means locks those axial positions which are in the predetermined range, only for the respective next to be rolled flat rolling stock. Alternatively, the control device can lock the corresponding axial positions for a plurality of subsequently rolled rolled goods. Furthermore, the control device blocks the corresponding axial positions for a number of flat rolled goods. Thereafter, if so the corresponding number has been rolled on other flat rolled goods, but the Steuerein direction lifts the lock again. This is true regardless of whether the number of flat rolled goods for which the lock has been made is 1 or greater than 1.

The blocking of actually classified as permissible Axialpo positions is, as already mentioned, only made if after locking still at least one permissible as a stepped axial position remains. As a rule, the control device blocks at least the current axial position at which the flat rolling stock rolled immediately before is rolled. However, other criteria are possible that for example the blocking of axial positions by the operator has priority. The prioritization can be fixed or specified by the operator.

The object is further achieved by a control program having the features of claim 11. According to the invention causes the execution of the control program that the Steuereinrich device performs an inventive method.

The object is further achieved by a control device with the features of claim 12. According to the invention, the control device is designed such that it carries out a method according to the invention. In particular, the control device can be programmed with a control program according to the invention.

The object is further achieved by a roll stand for rolling a flat rolling stock having the features of claim 13. solves. According to the invention, the rolling stock is controlled by a control device according to the invention.

Brief description of the drawings

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

1 shows a roll stand from the side,

2 shows the rolling stand of FIG. 1 from the front,

3 shows another rolling mill from the side,

4 shows the rolling stand of FIG. 3 from the front,

5 shows a pair of rollers,

6 shows a flow chart,

7 shows a course of a quality measure as a function of

Axial position and

8 shows a pair of work rolls and a flat rolling stock.

Description of the embodiments

According to FIGS. 1 to 4, a flat rolling stock 2 is to be rolled in a rolling stand 1. The rolling mill 1 has at least one pair of rollers 4, 5, between which the flat rolling stock 2 is located. In principle, it is possible that only the rollers 4, 5 are present, that the rolling stand 1 is thus formed as Duogerüst. In general, however, a pair of backup rollers 3 is also available. In this case, the rollers 4, 5 between the support rollers 3 and the flat roller 2 are well arranged. In particular, according to the presen- tation in FIGS 1 to 4 usually at least work rolls 4 are present, ie rollers that are in operation in direct contact with the flat rolling stock 2. If, as shown in Figures 1 and 2, except the back-up rolls 3, only the work rolls 4 are present, it is in the rolling stand 1 to a High stand. If, as shown in Figures 3 and 4, in addition to the support rollers 3 and the work rolls 4 and intermediate rolls 5 are present, it is in the roll stand 1 to a Sextogerüst.

The present invention will be explained below in connection with embodiments in which - both for a quarto scaffolding as well as for a Sextogerüst - the work rolls 4 are axially displaced in opposite directions. In the case of a sexto-scaffold, however, it is also possible - be it alternative, in addition to the work rolls 4 - that the intermediate rolls 5 are axially displaceable.

Furthermore, a distinction is made in the context of the following explanation of the invention between different rolling stock 2. In this case, it is possible for the different rolled products 2 to be physically separated rolling products 2, so that between the rolling of a rolling stock 2 and the rolling of the following rolling stock 2, a longer or shorter rolling break is compulsory. However, it is also possible that the Un distribution in different rolling stock 2 is purely fictitious type, that is, a longer rolling stock 2 is divided only mentally in different dene shorter rolling stock 2.

According to Figures 2 and 4, as already mentioned, the working rollers 4 axially displaceable in opposite directions. The corresponding shift state is subsequently characterized as axial position x be. "Axial position" is in the context of the present invention, therefore, not used in the sense of a specific point along a roll bale of a roll 3, 4, 5 or over the width of the flat rolled stock 2, but in the sense of a certain sliding position of a work roll 4 against the other work roll 4.

The work rolls 4 can be provided with a certain contour as required. For example, you can be provided with a zy-cylindrical contour. According to the presen- tation in FIG 5, the work rolls 4 are on their bale length provided with a bottle neck curved contour. The like bottle neck contours are in professional circles for example as CVC grinding and SmartCrown grinding be known. The contours of the work rolls 4 complement each other in the load-free state of the roll stand 1 as a rule at ei ner (1) axial position x complementary. However, embodiments are also possible in which the supplement is not complementary and / or occurs only in the loaded state of the rolling stand 1. Furthermore, the curved contours may have chamfers or gradual transitions at their axial ends. Regardless of the specific configuration of the contours of the work rolls 4, the work rolls 4 but each form a parabolic roller gap, the extent of parabolicity in the case of bottle neck-like contours depends on the extent of the axial displacement of the work rolls 4.

The rolling mill 1, as shown in FIGS. 1 to 4, furthermore has a bending system 6. By means of the bending system 6, the work rolls 4 can be bent in a defined manner in a manner known per se. Also by the bending system 6, in particular the nip a parabola shape can be impressed. Within certain limits, therefore, since the effect of the axial displacement of the work rolls 4 on the one hand and the effect of the bending system 6 on the other side mutually reinforce or gegensei tig compensate, depending on the nature and extent of each control to a sliding system 7, with the work rolls 4 can be moved, and the bending system 6. By means of both systems 6, 7 can thus be adjusted in particular the Walzspaltkon structure.

The rolling mill 1 is controlled by a control device 8. In particular, the bending system 6 and the sliding system 7 are controlled by the control device 8. The Steuerein device 8 is designed such that it carries out a method in operation, which will be explained in more detail below. In particular, the control device 8 can be programmed for this purpose with a control program 9. The control program includes in this case machine code 10, the device 8 can be processed by the control. The execution of the machine code 10 by the controller 8 causes in this case that the controller 8 executes the corresponding procedural ren, which includes in particular the control of the bending system 6 and the sliding system 7.

According to FIG. 6, the control device 8 determines in one

Step S1 for a plurality of axial positions x of the Ar beitswalzen 4 (defined by a respective control of the sliding system 7), through which respective control of the bending system 6, the roll gap contour of a predetermined nominal roll gap contour is approximated optimally. At the same time, it also determines a quality measure A for the correspondence of the resulting roll gap contour with the desired roll gap contour. The corresponding situation is shown in FIG 7 by a corre sponding quality measure A as a function of the axial positions x. The control device 8 can determine the quality measure A, for example, by means of a cost function. In this case, the respective local deviation of the roll gap contour from the set roll gap contour enters into the cost function, in particular at a number of support points across the width of the flat rolled stock 2. The number of supporting points over the width of the flat rolled stock 2, at which the control device 8 determines the respective local deviation of the roll gap contour from the nominal roll gap contour, is generally at least 5 points, better at least 10 points.

In many cases, the comparison is even carried out at a considerably larger number, for example at 20, 50 or even more interpolation points.

In addition, further variables can be included in the cost function, for example an extent and / or a speed with which the axial position x, based on a current axial positioning - ie the positioning of the corre sponding actuating system 6, 7 at the time of rolling of the un previously rolled flat rolled stock 2 (hereinafter referred to as rolling stock 2A) -, must be adjusted. The control device 8 can set the axial positions x discretely-for example within the possible displacement range of the work rolls 4 every 5 mm, every 10 mm or every 20 mm-or continuously. In the latter case, as a rule, a determination of the quality measure A is made only for supporting the axial position x. Between the interpolation points, the control device 8 polishes the quality measure A.

The controller 8 executes step S1 before rolling the respective flat rolled stock 2 (hereinafter referred to as rolling 2B). In general, the control device 8 continues to execute the step S1 after rolling the rolling stock 2A rolled immediately before.

The control device 8 observes technological boundary conditions in the context of the execution of step S1. Such boundary conditions may consist in particular of the extent to which the bending system 6 and / or the sliding system 7 can be controlled via the main, ie the maximum possible sliding stroke and the maximum possible bending stroke. Alternatively and in particular, the boundary conditions may be be that, taking into account a maximum adjustment speed for the sliding system 7, the possible range of axial positions x is limited and / or taking into account a maximum adjustment for the bending system 6 made a restriction on the achievable nip contour becomes.

In a step S2, the control device 8 determines those axial positions x, at which the quality measure A (based essentially on the deviation of the resulting roll gap contour from the target roll gap contour) is below a predetermined limit MAX. These axial positions x represent the total amount of the allowable axial positions x. In a step S3, the control device 10 then removes axial positions x blocked from the set of permissible axial positions x.

For example, in the context of step S3, the control device 8 can receive a locking command C from an operator 11 (see FIGS. 1 and 3). In this case, the controller 8 inhibits the axial positions x specified in the lock command C. For example, due to the specification of the operator 11, the control device 8 can block the axial position x supplemented with the letter A in FIG.

Alternatively or additionally, it is possible that the control device 8 as shown in FIG 8 (mind least) a resultant edge 12 of the work rolls 4 ermit mined and checks at which axial position x beitswalzen one of the Ar 4, the resulting edge 12 on a rolling stock edge 13 of the rolling stock 2B to be rolled would be positioned. In this case, the control device 8 blocks according to the representation in FIG 7, for example, the supplemented in Figure 7 with the letter B axial position x. It is possible that the control device 8 in the context of determining the resul animal edge 12 only the wear of the work rolls 4 be taken into account. However, the control device 8 preferably determines the resulting edge 12, taking into account the cut, the thermal crowning and / or the wear of the work rolls 4.

Alternatively or additionally, it is possible that the control device 8 as shown in FIG 7 diejeni conditions axial positions x blocks that are in a predetermined range around that axial position x around, in which the immediately previously rolled flat rolling stock 2A - here flat rolling stock 2A - is rolled. For example, the control device 8 can block those axial position x whose distance a is below a minimum distance amin from that axial position x at which the immediately previously rolled flat rolling 2 is rolled. In FIG. 7, these are the axial positions x supplemented with the letter C.

In the latter case - that is, the lock as a function of the predetermined range - it is possible that the lock applies only to the flat rolling stock 2 to be rolled next-that is, the flat rolling stock 2B. Alternatively, it is possible to maintain the lock for a predetermined number of flat rolled products 2, for example for the flat rolled material 2B and the next two flat rolled goods 2. Thereafter, however, the controller 8 automatically releases the lock again. Furthermore, the duration of the lock may be a function of the sign and / or amount of the distance a, in particular decreasing with increasing distance a.

The extent to which the controller 8 inhibits axial positions x in step S3 may be determined as needed. Irrespective of the extent of the locks, however, the locking is only carried out so far that even after removing the locked axial positions x from the set of permitted axial positions x x remains at least one axial position x, ie at least one axial position x, both allowed as well as not locked. In other words:

If only a single axial position x is permissible, the axial position x x must not be blocked in step S3, since otherwise no axial position x that would be too loose for the rolling of the flat rolled stock 2 would be available. If, however, the number of permissible axial positions x is greater than 1, at least one (in principle permissible) axial position x is blocked in step S3. However, the locking of axial positions x is performed only to the extent that even then at least one axial position x remains permissible. In the priority case, the axial position x is usually blocked during the locking, in which the flat rolling stock 2, which is rolled immediately before, is rolled - in this case, the flat rolling stock 2A. In principle, however, other prioritizations are possible. Furthermore, the locking of axial positions x is not simply optional, but mandatory, if at all the possibility for blocking axial positions x exists. The Steuereinrich device 8 checks in the context of step S3 so always, whether the number of permissible axial positions x is greater than 1. If this is the case, at least one axial position x ge is blocked. If this is not the case - but only then - the locking of the only permissible axial position x in this case is omitted.

In a step S4, the controller 8 determines the per spective axial position x, in which the rolling now to be rolled fla che rolling 2 - according to example so the rolling stock 2B - to be rolled. This axial position x is referred to below as re-descending axial position x. The determination of the resulting axial position x is carried out by selecting one of the permissible and at the same time not locked axial positions x. Also, the step S4 is performed before rolling the corresponding rolling stock 2.

The manner in which the control device 8 determines the re-increasing axial position x, for example, can be done on a stochastic basis. Alternatively, the Steuerein device 8 for the axial positions x based on a rating criterion determine a rating and assign the axial positions x. In this case, the controller 8 determines the resultant axial position x from the evaluation. It is sufficient to carry out the determination and assignment of the evaluation only for the remaining axial positions x, ie the permissible and at the same time not locked axial positions x. For even the determination of the resulting axial position x is only taking into account these axial positions x.

The rating can be determined as needed. The control device 8 preferably determines the evaluation on the basis of tech nological criteria, in particular the quality measure A. In a step S5, the control device 8 is finally the rolling stand 1 as the axial position x for rolling the flat rolled material 2 - according to example of the rolling stock 2B - the resulting axial position x before x. The corresponding rolling stock 2 is thus with this axial position x of the work rolls 4 and the corresponding thereto, be in the context of step S1 be true state of the bending system 6 in the roll stand 1 ge rolls.

The present invention has been explained above in the manner that the work rolls 4 are the axially displaceable rolls. In the case of a Sextogerüsts, however, it is possible that the intermediate rollers 5 are axially displaceable. In this case, the execution of the inventive method with respect to the intermediate rolls 5. in the case of a Sextogerüsts it is even possible that both the work rolls 4 and the intermediate rolls 5 are axially displaceable. In this case, the execution of the method according to the invention can be done so well with respect to the work rolls 4 as well as with respect to the intermediate rolls 5.

The present invention has many advantages. In particular, it can be ensured in a simple and reliable manner that the wear of the work rolls 4 and / or the intermediate rolls 5 is smeared over a large portion of its axial extension He, so that nowhere can form a significant wear edge wear. If necessary, it is even possible to determine the axial position x sequentially one after the other in such a way that work is very deliberate on a desired roll wear. Due to the various possibilities of locking axial positions x and the various possibilities of determining the resulting axial position x from the remaining axial positions, a high degree of flexibility results, so that the procedure according to the invention can be used without further modifications in the multiplicity of rolling stands , 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 variants may be derived by those skilled in the art without departing from the scope of the invention.

LIST OF REFERENCE NUMBERS

1 rolling stand

2 flat rolled goods

3 back-up rolls

4 work rolls

5 intermediate rolls

6 bending system

7 sliding system

8 control device

9 control program

10 machine code

11 operators

12 resulting edge 13 rolling stock edge a distance

Minimum distance

A quality measure

MAX barrier

S1 to S5 steps

x, xA, xB, xC axial positions

Claims

claims

1. A method for rolling a flat rolled stock (2) in a rolling stand (1), wherein the rolling stand (1) at least a pair of rollers (4, 5), wherein the flat rolling stock (2) between the two rollers (4, 5), wherein the rollers (4, 5) are axially displaceable in opposite directions, wherein the Walzge scaffold (1) has a bending system (6) for the rollers (4, 5),

- wherein a control device (8) of the roll stand (1) for controlling the roll gap contour as adjusting mechanisms, the Bie movement and the axial displacement of the rollers (4, 5) zoom,

- wherein the control device (8) before rolling a jewei time rolling stock (2) determines a respective axial position (x) as re sultierende axial position (x) and the rolling stand (1) as the axial position (x) of the rollers (4, 5) Pretending rolling of the next flat rolling stock (2),

characterized ,

- That the control device (8) before rolling the respec conditions rolling stock (2) for a plurality of axial positions (x) of the rollers (4, 5) determines how far by driving the adjusting mechanisms (6, 7) under consideration of technological constraints predetermined target roll gap contour can be approached,

- that the control device (8) classifies those axial positions (x) as permissible, in which a deviation of the resulting roll gap contour from the nominal roll gap contour lies below a predetermined barrier,

- That the control device (8) from the set of axial positions classified as zuläs sig (x) locked Axialpositi onen (x) away, if even after removing the ge locked axial positions (x) at least one as too casual classified axial position (x) remains, and

- That the control device (8) as a resultant Axialposi tion (x) one of the remaining axial positions (x) be true.

2. The method according to claim 1,

characterized ,

that the roll stand in addition to the rollers (4, 5) Stützwal zen (3), wherein the rollers (4, 5) respectively between the support rollers (3) and the rolling stock (2) are arranged.

3. The method according to claim 1 or 2,

characterized ,

the rollers (4, 5) are provided with a bottle-neck-like curved contour.

4. The method according to claim 1, 2 or 3,

characterized ,

in that the control device (8) determines the resulting axial position (x) on a stochastic basis.

5. The method according to claim 1, 2 or 3,

characterized ,

in that the control device (8) assigns a rating to at least the remaining axial positions (x) on the basis of a rating criterion, and that the control device (8) determines the resulting axial position (x) on the basis of the rating.

6. The method according to claim 5,

characterized ,

the control device (8) determines the evaluation on the basis of technological criteria.

7. Method according to one of the above claims,

characterized ,

in that the control device (8) receives a locking command (C) from an operator (11) and that the control device (8) blocks axial positions (x) specified in the locking command (C).

8. The method according to any one of the above claims,

characterized ,

in that the control device (8) takes into account a Ground, a thermal crowning and / or a wear of the rollers Ver (4, 5) a resultant edge (12) egg ner of the rollers (4, 5) determined and that the Steuereinrich device (8) locks those axial positions (x) at in which the resulting edge (12) of one of the rollers (4, 5) is positioned on a rolling-material edge (13) of the flat rolling stock (2).

9. Method according to one of the above claims,

characterized ,

in that the control device (8) blocks those axial positions (x) which are located in a predetermined range around the axial position (x) at which the flat rolled stock (2A) rolled immediately before is rolled.

10. The method according to claim 9,

characterized ,

in that the control device (8) has those axial positions (x) whose distance (a) is below the minimum distance (amin) from the axial position (x) at which the flat rolled stock (2A) rolled in advance is rolled for a predetermined number of flat rolling stock (2) locks and then picks up the lock again.

11. Control program for a control device (8) for controlling a rolling stand (1), wherein the control program comprises machine code (10) which can be processed by the control device (8), wherein the processing of the machine code (10) by the control device (8). causes the control device (8) to carry out a method according to one of the above claims.

12. Control device for a roll stand (1), wherein the STEU ereinrichtung is designed such that it carries out a method according to one of claims 1 to 8 in operation, in particular special with a control program (9) according to claim 11 is programmed.

13. rolling stand for rolling a flat rolled stock (2),

- wherein the roll stand comprises a pair of rollers (4, 5),

wherein the flat rolling stock 2 is located between the two rolls 4, 5,

- wherein the rollers (4, 5) are axially displaceable in opposite directions,

- wherein the roll stand has a bending system (6) for the rolls (4, 5),

- Wherein the rolling mill is controlled by a control device (8) according to claim 12.