EP3536411B1 - Avoidance of wearing edges when rolling flat rolled products - Google Patents

Avoidance of wearing edges when rolling flat rolled products Download PDF

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Publication number
EP3536411B1
EP3536411B1 EP18160879.5A EP18160879A EP3536411B1 EP 3536411 B1 EP3536411 B1 EP 3536411B1 EP 18160879 A EP18160879 A EP 18160879A EP 3536411 B1 EP3536411 B1 EP 3536411B1
Authority
EP
European Patent Office
Prior art keywords
control device
rollers
rolling
axial positions
axial position
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP18160879.5A
Other languages
German (de)
French (fr)
Other versions
EP3536411A1 (en
Inventor
Andrea Schmidt
Alexander Thekale
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Primetals Technologies Germany GmbH
Original Assignee
Primetals Technologies Germany GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Primetals Technologies Germany GmbH filed Critical Primetals Technologies Germany GmbH
Priority to EP18160879.5A priority Critical patent/EP3536411B1/en
Priority to CN201980018241.XA priority patent/CN111801173B/en
Priority to PCT/EP2019/053618 priority patent/WO2019170381A1/en
Priority to US16/970,078 priority patent/US20210046529A1/en
Publication of EP3536411A1 publication Critical patent/EP3536411A1/en
Application granted granted Critical
Publication of EP3536411B1 publication Critical patent/EP3536411B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/40—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling foils which present special problems, e.g. because of thinness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B21B37/165—Control of thickness, width, diameter or other transverse dimensions responsive mainly to the measured thickness of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • B21B37/42—Control of flatness or profile during rolling of strip, sheets or plates using a combination of roll bending and axial shifting of the rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/42—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for step-by-step or planetary rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/14—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls
    • B21B13/142—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls by axially shifting the rolls, e.g. rolls with tapered ends or with a curved contour for continuously-variable crown CVC
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/02—Transverse dimensions
    • B21B2261/04—Thickness, gauge
    • B21B2261/046—Different thickness in width direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/14—Roughness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2269/00—Roll bending or shifting
    • B21B2269/02—Roll bending; vertical bending of rolls
    • B21B2269/04—Work roll bending
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2269/00—Roll bending or shifting
    • B21B2269/12—Axial shifting the rolls

Definitions

  • the present invention is further based on a control program for a control device for controlling a roll stand, the control program comprising machine code that can be processed by the control device, the processing of the machine code by the control device causing the control device to carry out such a method.
  • the present invention is also based on a control device for a roll stand, the control device being designed such that it executes such a method during operation, in particular is programmed with such a control program.
  • the quality of the surface and the contour of the rolling stock transverse to the rolling direction are decisive parameters for flat rolling stock.
  • further processing steps that take place after rolling place certain demands on compliance, in particular with a desired contour of the flat rolling stock, i.e. the thickness profile as a function of the width of the flat rolled stock.
  • a major influencing factor for the contour of the flat rolling stock is the contour of the surfaces of the rolls of the rolling stand.
  • This contour is essentially composed of three components, namely on the one hand the roll grinding of a respective roll, on the other hand the thermal expansion of the respective roll and finally the wear and tear of the respective roll.
  • the wear on the edge of the strip edge of the rolling stock ie on the edges of the flat rolling stock
  • Measures must therefore often be taken to avoid that such steps are impressed in the flat rolling stock.
  • the production is adjusted.
  • a few rolled goods are first rolled, which gradually become wider.
  • the rolling of these rolling stock serves to warm up the roll.
  • only rolled goods are rolled whose width is gradually decreasing.
  • This procedure is known in specialist circles as what is known as the coffin lid operation. It has the advantage that the flat rolling stock can be rolled between the wear edges of its predecessors.
  • Another approach is to mechanically grind away the wear edges during the rolling process.
  • Such a method is for example from WO 2006/059 667 A1 known.
  • the object of the present invention is to create possibilities by means of which in particular the wear, viewed in the direction of the axis of rotation of the rolls, can be reliably distributed over a sufficiently large area and, at the same time, an accumulation of wear at individual points on the rolls can be reliably counteracted.
  • the roll stand is a duo stand, that is to say a roll stand in which there are no other rolls apart from the rolls mentioned.
  • the rolls according to the invention are the work rolls of the roll stand.
  • the roll stand has at least back-up rolls, the rolls each being arranged between the back-up rolls and the rolling stock.
  • the roll stand is usually a four-high stand or a six-high stand.
  • a four-high stand is a roll stand with a total of four rolls arranged one above the other. In this case, there are only backup rolls in addition to the rolls according to the invention.
  • the roll stand is a six-high stand, i.e.
  • a roll stand that, in addition to the back-up rolls and the work rolls, has two intermediate rolls that are each arranged between one of the back-up rolls and one of the work rolls.
  • the rolls according to the invention can also be the work rolls of the roll stand.
  • it can be the intermediate rolls.
  • both the work rolls and the intermediate rolls it is even possible for both the work rolls and the intermediate rolls to be axially displaceable, so that both the work rolls and the intermediate rolls are rolls within the meaning of the present invention.
  • rollers are provided with a cylindrical contour.
  • the present invention shows its full advantages, however, when the rollers are provided with a contour that is curved in the manner of a bottle neck.
  • the control device When determining the permissible axial positions, the control device takes into account, in particular, technological boundary conditions of the roll stand. Such boundary conditions are determined, for example, by the setting limits of the setting mechanisms and by the maximum possible adjustment speeds of the setting mechanisms. The adjustment limits of the adjustment mechanisms and the maximum possible adjustment speed can be due to technical reasons or restricted by an operator.
  • the roll gap contour corresponds to the thickness of the flat rolled stock after rolling, spatially resolved over the strip width.
  • the thickness of the flat rolled stock is determined over the strip width at at least 5 points, better at at least 10 points, for example at 20 points or more.
  • control device determines the axial position actually used from the remaining axial positions.
  • control device determines the resulting axial position on a stochastic basis. This procedure in particular avoids that - regardless of the reasons - certain axial positions are used disproportionately and thus results in wear in particular at the points of the further rollers at which the resulting edges of the rolled stock are located when the flat rolled stock is rolled.
  • control device assigns an evaluation to at least the remaining axial positions on the basis of an evaluation criterion and that the control device determines the resulting axial position on the basis of the evaluation.
  • the optimal axial position for rolling the respective flat rolled stock can be used, in accordance with the assessment.
  • the control device can determine the evaluation in particular on the basis of technological criteria.
  • the locking of axial positions can also be done as required.
  • control device it is possible for the control device to receive a locking command from an operator and for the control device to then receive axial positions specified in the locking command locks.
  • the operator is able, for example, on the basis of higher-level technological knowledge that is not available in the control device, to block certain disadvantageous axial positions.
  • wear edges occur in the rolls.
  • the position of these wear edges is usually known to the control device because the control device usually knows which flat rolling stock (with what width) has already been rolled at which axial position of the further rolls, i.e. where the wear edges have arisen.
  • the control device determines a resulting edge of one of the rollers taking into account a grinding, thermal crowning and / or wear of the rollers and to block those axial positions in which the resulting edge of one of the rollers is on a rolling stock edge of the flat Rolled stock would be positioned.
  • the control device preferably also blocks those axial positions whose spacing is in a predetermined range around that axial position in which the flat rolled stock that was rolled immediately before is rolled. This ensures that when several flat rolled goods are rolled, the further rolls are positioned in a relatively large displacement area, so that the wear on the further rolls is distributed over a large area of the width of the further rolls. This increases the service life of the other rollers.
  • the predetermined area is symmetrical with respect to the axial position in which the flat rolled material that was rolled immediately before is rolled. In this case, the axial position at which the flat material rolled immediately before is rolled is in the center of the predetermined range. However, the area can also be arranged asymmetrically.
  • control device it is possible for the control device to block those axial positions which lie in the predetermined range only for the flat rolling stock to be rolled next.
  • control device can block the corresponding axial positions for several subsequently rolled products.
  • the control device locks the corresponding axial positions for a number of flat rolled products. Afterwards, however, when the corresponding number of further flat rolled products has been rolled, the control device cancels the lock again. This applies regardless of whether the number of flat rolled products for which the block has been made is 1 or greater than 1.
  • the locking of axial positions actually classified as permissible is, as already mentioned, only carried out if at least one axial position classified as permissible remains after the locking.
  • the control device blocks at least the current axial position in which the flat rolled material that was rolled immediately before is rolled.
  • other criteria are also possible, such that, for example, the blocking of axial positions by the operator has priority.
  • the prioritization can be fixed or specified by the operator.
  • control program with the features of claim 11.
  • processing of the control program has the effect that the control device executes a method according to the invention.
  • control device having the features of claim 12.
  • the control device is designed such that it executes a method according to the invention.
  • the control device can be programmed with a control program according to the invention.
  • the object is also achieved by a roll stand for rolling flat rolling stock with the features of claim 13.
  • the rolling stock is controlled by a control device according to the invention.
  • a flat rolling stock 2 is to be rolled in a roll stand 1.
  • the roll stand 1 has at least one pair of rolls 4, 5, between which the flat rolling stock 2 is located.
  • the rolls 4, 5 are arranged between the backup rolls 3 and the flat rolling stock 2.
  • at least work rolls 4 are present, ie rolls which are in direct contact with the flat rolling stock 2 during operation. If, as in the FIGS.
  • the roll stand 1 is a Quarto scaffolding. If, as in the FIGS 3 and 4 shown, in addition to the backup rolls 3 and the work rolls 4 and intermediate rolls 5 are present, the roll stand 1 is a six-high stand.
  • the work rolls 4 axially displaceable in opposite directions.
  • the corresponding displacement state is referred to below as the axial position x.
  • "Axial position" is not used in the context of the present invention in the sense of a specific point along a roll barrel of a roll 3, 4, 5 or across the width of the flat rolling stock 2, but in the sense of a specific shift position of one work roll 4 relative to the other work roll 4th
  • the work rolls 4 can be provided with a specific contour as required. For example, they can be provided with a cylindrical contour. According to the representation in FIG 5 are the work rolls 4 over their barrel length provided with a bottle neck-like curved contour. Such bottle neck-like contours are known in specialist circles, for example, as CVC cuts and SmartCrown cuts.
  • the contours of the work rolls 4 complement each other in the load-free state of the roll stand 1, as a rule, at one (1) axial position x.
  • the curved contours can have chamfers or gradual transitions at their axial ends. Regardless of the specific design of the contours of the work rolls 4, however, the work rolls 4 form a parabolic roll gap, the extent of the parabolism in the case of the bottle neck-like contours depending on the extent of the axial displacement of the work rolls 4.
  • the roll stand 1 has, as shown in FIGS. 1 to 4 furthermore a bending system 6.
  • the work rolls 4 can be bent in a defined manner in a manner known per se.
  • a parabolic shape can also be impressed in particular on the roll gap by the bending system 6. Therefore, within certain limits, 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 hand can mutually reinforce or compensate each other, depending on the type and extent of the respective control of a sliding system 7 with which the work rolls 4 can be moved, and the bending system 6.
  • both systems 6, 7, in particular, the roll gap contour can be adjusted.
  • the roll stand 1 is controlled by a control device 8.
  • the bending system 6 and the sliding system 7 are controlled by the control device 8.
  • the control device 8 is designed in such a way that it executes a method during operation that is explained in more detail below.
  • the control device 8 can be programmed with a control program 9 for this purpose.
  • the control program in this case comprises machine code 10 which can be processed by the control device 8.
  • the processing of the machine code 10 by the control device 8 causes the control device 8 to carry out the corresponding method, which in particular includes the control of the bending system 6 and the sliding system 7.
  • the control device 8 determines for a large number of axial positions x of the work rolls 4 (defined by a respective control of the sliding system 7), by means of which control of the bending system 6 the roll gap contour is optimally approximated to a predetermined desired roll gap contour. At the same time, it also determines a quality measure A for the conformity of the resulting roll gap contour with the target roll gap contour.
  • the relevant facts are in FIG 7 represented by a corresponding 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.
  • the respective local deviation of the roll gap contour from the desired roll gap contour is included in the cost function, in particular at a number of support points over the width of the flat rolling stock 2.
  • the number of support points across the width of the flat rolling stock 2, at which the control device 8 determines the respective local deviation of the roll gap contour from the target roll gap contour is usually at least 5 places, better at least 10 places. In many cases, the comparison is even carried out on a considerably larger number, for example with 20, 50 or even more support points.
  • rolling stock 2A an extent and / or a speed with which the axial position x, based on a current axial positioning - that is, the positioning of the corresponding positioning system 6, 7 at the time of rolling the flat rolled stock that was rolled immediately before 2 (hereinafter referred to as rolling stock 2A) - must be adjusted.
  • the control device 8 can determine 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, the quality measure A is usually only determined for support points of the axial position x. The control device 8 interpolates the quality measure A between the support points.
  • the control device 8 executes the step S1 before the rolling of the respective flat rolling stock 2 (hereinafter referred to as rolling stock 2B). As a rule, the control device 8 continues to carry out step S1 after the rolling stock 2A that was rolled immediately before has been rolled.
  • the control device 8 observes technological boundary conditions in the course of executing step S1.
  • boundary conditions can in particular consist of the extent to which the bending system 6 and / or the sliding system 7 can be controlled at all, that is to say the maximum possible sliding stroke and the maximum possible bending stroke.
  • the boundary conditions can 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 the achievable roll gap contour is restricted, taking into account a maximum adjustment speed for the bending system 6.
  • 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 permissible axial positions x.
  • control device 10 then removes blocked axial positions x from the set of permissible axial positions x.
  • control device 8 can receive a blocking command C from an operator 11 as part of step S3 (see FIG FIG 1 and 3 ). In this case, the control device 8 blocks the axial positions x specified in the blocking command C.
  • the control device 8 can, based on the specification of the operator 11, the in FIG 7 Block axial position x supplemented with the letter A.
  • control device 8 according to the representation in FIG 8 (At least) one resulting edge 12 of the work rolls 4 is determined and checks at which axial position x one of the work rolls 4 the resulting edge 12 would be positioned on a rolling stock edge 13 of the rolling stock 2B to be rolled.
  • the control device 8 locks as shown in FIG FIG 7 for example the in FIG 7 Axial position x supplemented with the letter B. It is possible that the control device 8 only takes into account the wear of the work rolls 4 when determining the resulting edge 12.
  • the control device 8 preferably determines the resulting edge 12, however, taking into account the cut, the thermal crown and / or the wear of the work rolls 4.
  • the control device 8 blocks those axial positions x which are located in a predetermined area around that axial position x at which the flat rolling stock 2A rolled immediately before - in this case the flat rolling stock 2A - is rolled.
  • the control device 8 can block that 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 stock 2 is rolled.
  • the lock as a function of the predetermined range - it is possible that the lock only applies to the flat rolling stock 2 to be rolled next - that is, the flat rolling stock 2B.
  • the control device 8 then automatically releases the lock again.
  • the duration of the block can be a function of the sign and / or amount of the distance a, in particular decrease with increasing distance a.
  • the extent to which the control device 8 blocks axial positions x in step S3 can be determined as required. Regardless of the extent of the blocking, the blocking is only carried out to the extent that after removing the blocked axial positions x from the set of axial positions x classified as permissible, at least one axial position x remains, i.e. at least one axial position x that is both permissible and not Is blocked. In other words, if only a single axial position x is permissible, this axial position x must not be blocked in step S3, since otherwise no more permissible axial position x would be available for the rolling of the flat rolling stock 2.
  • step S3 If, on the other hand, the number of permissible axial positions x is greater than 1, at least one (principally permissible) axial position x is blocked in step S3.
  • the blocking of axial positions x is only carried out to the extent that at least one axial position x still remains permissible.
  • the axial position x at which the flat rolling stock 2 rolled immediately beforehand - that is to say here the flat rolling stock 2A - is rolled is still primarily blocked. In principle, however, other prioritizations are also possible.
  • the locking of axial positions x is not simply optional, but compulsory if there is any possibility of locking axial positions x.
  • the control device 8 therefore always checks in the context of step S3 whether the number of permissible axial positions x is greater than 1. If this is the case, at least one axial position x is blocked. If, on the other hand, this is not the case - but only then - the blocking of the only permissible axial position x in this case does not occur.
  • a step S4 the control device 8 determines the respective axial position x at which the flat rolling stock 2 that is now to be rolled - that is to say the rolling stock 2B according to the example - is to be rolled.
  • This axial position x is referred to below as the resulting axial position x.
  • the resulting axial position x is determined by selecting one of the permissible and at the same time unlocked axial positions x. Step S4 is also carried out before the rolling stock 2 is rolled.
  • control device 8 determines the resulting axial position x can for example take place on a stochastic basis.
  • the control device 8 can determine an evaluation for the axial positions x on the basis of an evaluation criterion and assign it to the axial positions x.
  • the control device 8 determines the resulting axial position x on the basis of the evaluation. It is sufficient to determine and assign the evaluation only for the remaining axial positions x, that is, the permissible and at the same time not blocked axial positions x. This is because the resulting axial position x is only determined 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 technological criteria, in particular the quality measure A.
  • step S5 the control device 8 finally specifies the resulting axial position x for the rolling stand 1 as the axial position x for rolling the flat rolling stock 2 - according to the example of the rolling stock 2B.
  • the corresponding rolling stock 2 is thus rolled in the rolling stand 1 with this axial position x of the work rolls 4 and the corresponding state of the bending system 6 determined in the context of step S1.
  • the present invention has been explained above in the manner that the work rolls 4 are the axially displaceable rolls.
  • the intermediate rolls 5 it is possible for the intermediate rolls 5 to be axially displaceable.
  • the method according to the invention is carried out with respect to the intermediate rolls 5.
  • the method according to the invention can be carried out both with respect to the work rolls 4 and with respect to the intermediate rolls 5.
  • the present invention has many advantages. In particular, it can be ensured in a simple and reliable way that the wear of the work rolls 4 and / or the intermediate rolls 5 is smeared over a large area of their axial extent, so that a significant wear edge cannot develop anywhere. If necessary, it is even possible to determine the axial position x sequentially one after the other in such a way that work is carried out in a very targeted manner towards a desired roller wear.
  • the various options for locking axial positions x and the various options for determining the resulting axial position x from the remaining axial positions x result in a high degree of flexibility, so that the procedure according to the invention can be applied to the large number of roll stands without further modifications.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)

Description

Gebiet der TechnikField of technology

Die vorliegende Erfindung geht aus von einem Verfahren zum Walzen eines flachen Walzguts in einem Walzgerüst, wobei das Walzgerüst mindestens ein Paar Walzen aufweist, wobei das flache Walzgut sich zwischen den beiden Walzen befindet, wobei die Walzen axial gegenläufig verschiebbar sind, wobei das Walzgerüst ein Biegesystem für die Walzen aufweist,

  • wobei eine Steuereinrichtung des Walzgerüsts zur Regelung der Walzspaltkontur als Stellmechanismen die Biegung und die axiale Verschiebung der Walzen heranzieht,
  • wobei die Steuereinrichtung vor dem Walzen eines jeweiligen Walzguts eine jeweilige Axialposition als resultierende Axialposition bestimmt und dem Walzgerüst als Axialposition der Walzen zum Walzen des nächsten flachen Walzguts vorgibt.
The present invention is based on a method for rolling a flat rolling stock in a roll stand, the roll stand having at least one pair of rollers, the flat rolling stock being between the two rollers, the rollers being axially displaceable in opposite directions, the rolling stand having a bending system for the rollers,
  • wherein a control device of the roll stand to regulate the roll gap contour uses the bending and the axial displacement of the rolls as adjusting mechanisms,
  • wherein the control device determines a respective axial position as the resulting axial position before the rolling of a respective rolled stock and specifies the roll stand as the axial position of the rolls for rolling the next flat rolled stock.

Die vorliegende Erfindung geht weiterhin aus von einem Steuerprogramm für eine Steuereinrichtung zum Steuern eines Walzgerüsts, wobei das Steuerprogramm Maschinencode umfasst, der von der Steuereinrichtung abarbeitbar ist, wobei die Abarbeitung des Maschinencodes durch die Steuereinrichtung bewirkt, dass die Steuereinrichtung ein derartiges Verfahren ausführt.The present invention is further based on a control program for a control device for controlling a roll stand, the control program comprising machine code that can be processed by the control device, the processing of the machine code by the control device causing the control device to carry out such a method.

Die vorliegende Erfindung geht weiterhin aus von einer Steuereinrichtung für ein Walzgerüst, wobei die Steuereinrichtung derart ausgebildet ist, dass sie im Betrieb ein derartiges Verfahren ausführt, insbesondere mit einem derartigen Steuerprogramm programmiert ist.The present invention is also based on a control device for a roll stand, the control device being designed such that it executes such a method during operation, in particular is programmed with such a control program.

Die vorliegende Erfindung geht weiterhin aus von einem Walzgerüst zum Walzen eines flachen Walzguts,

  • wobei das Walzgerüst mindestens ein Paar Walzen aufweist,
  • wobei das flache Walzgut sich zwischen den beiden Walzen befindet,
  • wobei die Walzen axial gegenläufig verschiebbar sind,
  • wobei das Walzgerüst ein Biegesystem für die Walzen aufweist,
  • wobei das Walzgerüst von einer derartigen Steuereinrichtung gesteuert wird.
The present invention is also based on a roll stand for rolling flat rolled stock,
  • wherein the roll stand has at least one pair of rolls,
  • the flat rolling stock is between the two rolls,
  • the rollers can be moved axially in opposite directions,
  • wherein the roll stand has a bending system for the rolls,
  • wherein the roll stand is controlled by such a control device.

Stand der TechnikState of the art

Aus der WO 2006/000 290 A1 ist ein Verfahren der eingangs genannten Art bekannt. Bei diesem Verfahren werden die Biegung der Walzen oder die Verschiebung der Walzen zyklisch variiert.From the WO 2006/000 290 A1 a method of the type mentioned is known. In this process, the bending of the rollers or the displacement of the rollers are varied cyclically.

Zusammenfassung der ErfindungSummary of the invention

Die Güte der Oberfläche und die Kontur des Walzgutes quer zur Walzrichtung sind bei einem flachen Walzgut entscheidende Kenngrößen. In der Regel stellen weitere Verarbeitungsschritte, die nach dem Walzen erfolgen, gewisse Ansprüche an die Einhaltung insbesondere einer Soll-Kontur des flachen Walzguts, d.h. des Dickenverlaufs als Funktion über die Breite des flachen Walzguts.The quality of the surface and the contour of the rolling stock transverse to the rolling direction are decisive parameters for flat rolling stock. As a rule, further processing steps that take place after rolling place certain demands on compliance, in particular with a desired contour of the flat rolling stock, i.e. the thickness profile as a function of the width of the flat rolled stock.

Ein wesentlicher Einflussfaktor für die Kontur des flachen Walzguts ist die Kontur der Oberflächen der Walzen des Walzgerüsts. Diese Kontur setzt sich im wesentlichen aus drei Bestandteilen zusammen, nämlich zum einen dem Walzenschliff einer jeweiligen Walze, zum anderen der thermischen Ausdehnung der jeweiligen Walze und schließlich dem Verschleiß der jeweiligen Walze. Besonders der Verschleiß an der Walzgutkante Bandkante (d.h. an den Rändern des flachen Walzguts) führt oftmals zu stufenartigen Mustern in der Walzenoberfläche. Es müssen daher oftmals Maßnahmen ergriffen werden, um zu vermeiden, dass derartige Stufen in das flache Walzgut eingeprägt werden.A major influencing factor for the contour of the flat rolling stock is the contour of the surfaces of the rolls of the rolling stand. This contour is essentially composed of three components, namely on the one hand the roll grinding of a respective roll, on the other hand the thermal expansion of the respective roll and finally the wear and tear of the respective roll. In particular, the wear on the edge of the strip edge of the rolling stock (ie on the edges of the flat rolling stock) often leads to step-like patterns in the roll surface. Measures must therefore often be taken to avoid that such steps are impressed in the flat rolling stock.

Im Stand der Technik sind verschiedene Vorgehensweisen bekannt, um ein Einprägen derartiger Stufen in das flache Walzgut zu vermeiden.Various procedures are known in the prior art for avoiding such steps from being impressed in the flat rolled stock.

Im einfachsten Fall wird die Produktion angepasst. In diesem Fall werden im Lauf einer Walzenreise zunächst einige wenige Walzgüter gewalzt, die nach und nach breiter werden. Das Walzen dieser Walzgüter dient dem Aufwärmen der Walze. Danach werden immer nur Walzgüter gewalzt, deren Breite nach und nach abnimmt. Diese Vorgehensweise ist in Fachkreisen als sogenannte Sargdeckel-Fahrweise bekannt. Sie hat den Vorteil, dass die flachen Walzgüter zwischen den Verschleißkanten ihrer Vorgänger gewalzt werden können.In the simplest case, the production is adjusted. In this case, in the course of a rolling journey, a few rolled goods are first rolled, which gradually become wider. The rolling of these rolling stock serves to warm up the roll. Thereafter, only rolled goods are rolled whose width is gradually decreasing. This procedure is known in specialist circles as what is known as the coffin lid operation. It has the advantage that the flat rolling stock can be rolled between the wear edges of its predecessors.

Ein weiterer Ansatz besteht darin, die Verschleißkanten während des Walzprozesses mechanisch wegzuschleifen. Ein derartiges Verfahren ist beispielsweise aus der WO 2006/059 667 A1 bekannt.Another approach is to mechanically grind away the wear edges during the rolling process. Such a method is for example from WO 2006/059 667 A1 known.

Ein weiterer Ansatz besteht darin, die Verschleißkante dadurch zu verschmieren, dass die entsprechenden Walzen während des Walzprozesses - insbesondere zwischen dem Walzen von aufeinanderfolgend gewalzten Walzgütern - axial verschoben werden. Diese Vorgehensweise ist für "normale" Walzen, die einen im wesentlichen zylindrischen Walzenschliff aufweisen, allgemein bekannt. In der WO 2006/000 290 A1 ist diese Vorgehensweise jedoch für Walzen erläutert, die mit einer flaschenhalsartig gekrümmten Kontur versehen sind.Another approach is to smear the wear edge by axially displacing the corresponding rolls during the rolling process - in particular between the rolling of successively rolled products. This procedure is generally known for "normal" rolls which have an essentially cylindrical roll cut. In the WO 2006/000 290 A1 however, this procedure is explained for rollers which are provided with a contour that is curved like a bottle neck.

Die aus der WO 2006/000 290 A1 bekannte Vorgehensweise stellt bereits einen Fortschritt gegenüber einer Vorgehensweise dar, bei welcher die Verschiebung der Walzen zum Walzen eines bestimmten flachen Walzguts ohne Berücksichtigung der Verschiebung der Walzen beim Walzen von zuvor gewalzten flachen Walzgütern ermittelt wird.The ones from the WO 2006/000 290 A1 known procedure already represents an advance over a procedure in which the displacement of the rolls for rolling a certain flat rolled stock is determined without taking into account the displacement of the rolls when rolling previously rolled flat rolled stock.

Auch die aus der WO 2006/000 290 A1 bekannte Vorgehensweise ist jedoch verbesserungsfähig. Insbesondere kann es auch bei der aus der WO 2006/000 290 A1 bekannten Vorgehensweise zu einer unerwünschten Akkumulation von Verschleiß an denjenigen Stellen der Walzen kommen, die im Bereich der Walzgutkanten liegen.Also from the WO 2006/000 290 A1 known procedure, however, can be improved. In particular, it can also be used for the WO 2006/000 290 A1 known procedure lead to an undesirable accumulation of wear at those points of the rollers which are in the area of the edges of the rolled material.

Die Aufgabe der vorliegenden Erfindung besteht darin, Möglichkeiten zu schaffen, mittels derer insbesondere der Verschleiß in Richtung der Rotationsachse der Walzen gesehen zuverlässig über einen hinreichend großen Bereich verteilt werden kann und damit gleichzeitig einer Akkumulation des Verschleißes an einzelnen Stellen der Walzen zuverlässig entgegengewirkt werden kann.The object of the present invention is to create possibilities by means of which in particular the wear, viewed in the direction of the axis of rotation of the rolls, can be reliably distributed over a sufficiently large area and, at the same time, an accumulation of wear at individual points on the rolls can be reliably counteracted.

Die Aufgabe wird durch ein Verfahren mit den Merkmalen des Anspruchs 1 gelöst. Vorteilhafte Ausgestaltungen des Verfahrens sind Gegenstand der abhängigen Ansprüche 2 bis 8.The object is achieved by a method with the features of claim 1. Advantageous refinements of the method are the subject matter of the dependent claims 2 to 8.

Erfindungsgemäß wird ein Verfahren der eingangs genannten Art dadurch ausgestaltet,

  • dass die Steuereinrichtung vor dem Walzen des jeweiligen Walzguts für eine Vielzahl von Axialpositionen der Walzen ermittelt, wie weit durch Ansteuerung der Stellmechanismen unter Beachtung technologischer Randbedingungen eine vorgegebene Soll-Walzspaltkontur angenähert werden kann,
  • dass die Steuereinrichtung diejenigen Axialpositionen als zulässig einstuft, bei denen eine Abweichung der sich ergebenden Walzspaltkontur von der Soll-Walzspaltkontur unterhalb einer vorgegebenen Schranke liegt,
  • dass die Steuereinrichtung aus der Menge der als zulässig eingestuften Axialpositionen gesperrte Axialpositionen entfernt, sofern auch nach dem Entfernen der gesperrten Axialpositionen noch mindestens eine als zulässig eingestufte Axialposition verbleibt, und
  • dass die Steuereinrichtung als resultierende Axialposition eine der verbleibenden Axialpositionen bestimmt.
According to the invention, a method of the type mentioned at the outset is designed by
  • that the control device determines, for a large number of axial positions of the rolls, before the rolling of the respective rolling stock, how far a specified target roll gap contour can be approximated by activating the adjusting mechanisms, taking technological boundary conditions into account,
  • that the control device classifies those axial positions as permissible in which a deviation of the resulting roll gap contour from the target roll gap contour is below a specified limit,
  • that the control device removes blocked axial positions from the set of axial positions classified as permissible, provided that at least one axial position classified as permissible still remains after the blocked axial positions have been removed, and
  • that the control device determines one of the remaining axial positions as the resulting axial position.

Es ist möglich, dass es sich bei dem Walzgerüst um ein Duogerüst handelt, also um ein Walzgerüst, bei dem außer den genannten Walzen keine weiteren Walzen vorhanden sind. In diesem Fall sind die erfindungsgemäßen Walzen die Arbeitswalzen des Walzgerüsts. In der Regel weist das Walzgerüst zusätzlich zu den Walzen jedoch zumindest Stützwalzen auf, wobei die Walzen jeweils zwischen den Stützwalzen und dem Walzgut angeordnet sind. In diesem Fall ist das Walzgerüst in der Regel ein Quartogerüst oder ein Sextogerüst. Ein Quartogerüst ist ein Walzgerüst mit insgesamt vier übereinander angeordneten Walzen. In diesem Fall sind zusätzlich zu den erfindungsgemäßen Walzen nur Stützwalzen vorhanden. Alternativ ist es möglich, dass es sich bei dem Walzgerüst um ein Sextogerüst handelt, also um ein Walzgerüst, dass zusätzlich zu den Stützwalzen und den Arbeitswalzen zwei Zwischenwalzen aufweist, die jeweils zwischen einer der Stützwalzen und einer der Arbeitswalzen angeordnet sind. In diesem Fall kann es sich bei den erfindungsgemäßen Walzen ebenfalls um die Arbeitswalzen des Walzgerüsts handeln. Alternativ kann es sich um die Zwischenwalzen handeln. Es ist im Falle eines Sextogerüsts sogar möglich, dass sowohl die Arbeitswalzen als auch die Zwischenwalzen axial verschiebbar sind, dass also sowohl die Arbeitswalzen als auch die Zwischenwalzen Walzen im Sinne der vorliegenden Erfindung sind.It is possible that the roll stand is a duo stand, that is to say a roll stand in which there are no other rolls apart from the rolls mentioned. In this case, the rolls according to the invention are the work rolls of the roll stand. As a rule, however, in addition to the rolls, the roll stand has at least back-up rolls, the rolls each being arranged between the back-up rolls and the rolling stock. In this case, the roll stand is usually a four-high stand or a six-high stand. A four-high stand is a roll stand with a total of four rolls arranged one above the other. In this case, there are only backup rolls in addition to the rolls according to the invention. Alternatively, it is possible that the roll stand is a six-high stand, i.e. a roll stand that, in addition to the back-up rolls and the work rolls, has two intermediate rolls that are each arranged between one of the back-up rolls and one of the work rolls. In this case, the rolls according to the invention can also be the work rolls of the roll stand. Alternatively, it can be the intermediate rolls. In the case of a six-high stand, it is even possible for both the work rolls and the intermediate rolls to be axially displaceable, so that both the work rolls and the intermediate rolls are rolls within the meaning of the present invention.

Es ist möglich, dass die Walzen mit einer zylindrischen Kontur versehen sind. Ihre vollen Vorteile zeigt die vorliegende Erfindung jedoch dann, wenn die Walzen mit einer flaschenhalsartig gekrümmten Kontur versehen sind.It is possible that the rollers are provided with a cylindrical contour. The present invention shows its full advantages, however, when the rollers are provided with a contour that is curved in the manner of a bottle neck.

Im Rahmen der Ermittlung der zulässigen Axialpositionen berücksichtigt die Steuereinrichtung insbesondere technologische Randbedingungen des Walzgerüsts. Derartige Randbedingungen sind beispielsweise durch die Stellgrenzen der Stellmechanismen und durch die maximal möglichen Verstellgeschwindigkeiten der Stellmechanismen bestimmt. Die Stellgrenzen der Stellmechanismen und die maximal möglichen Verstellgeschwindigkeit können technisch bedingt sein oder durch entsprechende Vorgaben von einem Bediener beschränkt werden.When determining the permissible axial positions, the control device takes into account, in particular, technological boundary conditions of the roll stand. Such boundary conditions are determined, for example, by the setting limits of the setting mechanisms and by the maximum possible adjustment speeds of the setting mechanisms. The adjustment limits of the adjustment mechanisms and the maximum possible adjustment speed can be due to technical reasons or restricted by an operator.

Die Walzspaltkontur korrespondiert mit der Dicke des flachen Walzguts nach dem Walzen, ortsaufgelöst über die Bandbreite. Die Dicke des flachen Walzguts ist hierbei über die Bandbreite an mindestens 5 Stellen bestimmt, besser an mindestens 10 Stellen, beispielsweise an 20 Stellen oder mehr.The roll gap contour corresponds to the thickness of the flat rolled stock after rolling, spatially resolved over the strip width. The thickness of the flat rolled stock is determined over the strip width at at least 5 points, better at at least 10 points, for example at 20 points or more.

Die Art und Weise, auf welche die Steuereinrichtung aus den verbleibenden Axialpositionen dann die tatsächlich herangezogene Axialposition bestimmt, kann nach Bedarf sein.The manner in which the control device then determines the axial position actually used from the remaining axial positions can be as required.

Beispielsweise ist es möglich, dass die Steuereinrichtung die resultierende Axialposition auf stochastischer Basis bestimmt. Bereits durch diese Vorgehensweise wird insbesondere vermieden, dass - egal aus welchen Gründen - bestimmte Axialpositionen überproportional oft verwendet werden und sich damit Verschleiß insbesondere an den Stellen der weiteren Walzen ergibt, an denen sich beim Walzen des flachen Walzguts die ergebenden Walzgutkanten befinden.For example, it is possible for the control device to determine the resulting axial position on a stochastic basis. This procedure in particular avoids that - regardless of the reasons - certain axial positions are used disproportionately and thus results in wear in particular at the points of the further rollers at which the resulting edges of the rolled stock are located when the flat rolled stock is rolled.

Alternativ ist es möglich dass die Steuereinrichtung zumindest den verbleibenden Axialpositionen anhand eines Bewertungskriteriums eine Bewertung zuordnet und dass die Steuereinrichtung die resultierende Axialposition anhand der Bewertung bestimmt. Dadurch kann jeweils die - entsprechend der Bewertung - optimale Axialposition zum Walzen des jeweiligen flachen Walzguts herangezogen werden. Die Steuereinrichtung kann die Bewertung insbesondere anhand technologischer Kriterien ermitteln.Alternatively, it is possible that the control device assigns an evaluation to at least the remaining axial positions on the basis of an evaluation criterion and that the control device determines the resulting axial position on the basis of the evaluation. As a result, the optimal axial position for rolling the respective flat rolled stock can be used, in accordance with the assessment. The control device can determine the evaluation in particular on the basis of technological criteria.

Das Sperren von Axialpositionen kann ebenfalls nach Bedarf erfolgen.The locking of axial positions can also be done as required.

Beispielsweise ist es möglich, dass die Steuereinrichtung von einem Bediener einen Sperrbefehl entgegennimmt und die Steuereinrichtung daraufhin in dem Sperrbefehl spezifizierte Axialpositionen sperrt. Dadurch ist der Bediener in der Lage, beispielsweise aufgrund von übergeordnetem technologischem Wissen, das in der Steuereinrichtung nicht vorhanden ist, bestimmte nachteilige Axialpositionen zu sperren.For example, it is possible for the control device to receive a locking command from an operator and for the control device to then receive axial positions specified in the locking command locks. As a result, the operator is able, for example, on the basis of higher-level technological knowledge that is not available in the control device, to block certain disadvantageous axial positions.

Wie bereits erwähnt, entstehen beim Walzen der flachen Walzgüter in den Walzen Verschleißkanten. Die Lage dieser Verschleißkanten ist der Steuereinrichtung in der Regel bekannt, weil der Steuereinrichtung in der Regel bekannt ist, welches flache Walzgut (mit welcher Breite) bei welcher Axialposition der weiteren Walzen bereits gewalzt wurde, wo also die Verschleißkanten entstanden sind. Zusätzlich ist es möglich, nach Bedarf den Schliff und die thermische Balligkeit einer jeweiligen Walze mit zu berücksichtigen. Im Ergebnis ist es daher möglich, dass die Steuereinrichtung unter Berücksichtigung eines Schliffs, einer thermischen Balligkeit und/oder eines Verschleißes der Walzen eine resultierende Kante einer der Walzen ermittelt und diejenigen Axialpositionen sperrt, bei denen die resultierende Kante einer der Walzen auf einer Walzgutkante des flachen Walzguts positioniert würde.As already mentioned, when the flat rolled goods are rolled, wear edges occur in the rolls. The position of these wear edges is usually known to the control device because the control device usually knows which flat rolling stock (with what width) has already been rolled at which axial position of the further rolls, i.e. where the wear edges have arisen. In addition, it is possible, if required, to take into account the cut and the thermal crown of a respective roll. As a result, it is therefore possible for the control device to determine a resulting edge of one of the rollers taking into account a grinding, thermal crowning and / or wear of the rollers and to block those axial positions in which the resulting edge of one of the rollers is on a rolling stock edge of the flat Rolled stock would be positioned.

Vorzugsweise sperrt die Steuereinrichtung weiterhin diejenigen Axialpositionen, deren Abstand die sich in einem vorbestimmten Bereich um diejenige Axialposition herum befinden, bei der das unmittelbar zuvor gewalzte flache Walzgut gewalzt wird. Dadurch wird erreicht, dass beim Walzen mehrerer flacher Walzgüter die weiteren Walzen in einem relativ großen Verschiebebereich positioniert werden, so dass der Verschleiß der weiteren Walzen über einen großen Bereich der Breite der weiteren Walzen verteilt wird. Dadurch wird die Standzeit der weiteren Walzen erhöht. Im einfachsten Fall ist der vorbestimmte Bereich symmetrisch bezüglich der Axialposition, bei der das unmittelbar zuvor gewalzte flache Walzgut gewalzt wird. In diesem Fall liegt die Axialposition, bei der das unmittelbar zuvor gewalzte flache Walzgut gewalzt wird, in der Mitte des vorbestimmten Bereichs. Der Bereich kann aber auch asymmetrisch angeordnet sein.The control device preferably also blocks those axial positions whose spacing is in a predetermined range around that axial position in which the flat rolled stock that was rolled immediately before is rolled. This ensures that when several flat rolled goods are rolled, the further rolls are positioned in a relatively large displacement area, so that the wear on the further rolls is distributed over a large area of the width of the further rolls. This increases the service life of the other rollers. In the simplest case, the predetermined area is symmetrical with respect to the axial position in which the flat rolled material that was rolled immediately before is rolled. In this case, the axial position at which the flat material rolled immediately before is rolled is in the center of the predetermined range. However, the area can also be arranged asymmetrically.

Es ist möglich, dass die Steuereinrichtung diejenigen Axialpositionen, die in dem vorbestimmten Bereich liegen, nur für das jeweils als nächstes zu walzende flache Walzgut sperrt. Alternativ kann die Steuereinrichtung die entsprechenden Axialpositionen für mehrere nachfolgend gewalzte Walzgüter sperren. Weiterhin sperrt die Steuereinrichtung die entsprechenden Axialpositionen zwar für eine Anzahl an flachen Walzgütern. Danach, wenn also die entsprechende Anzahl an weiteren flachen Walzgütern gewalzt worden ist, hebt die Steuereinrichtung die Sperre jedoch wieder auf. Dies gilt unabhängig davon, ob die Anzahl an flachen Walzgütern, für welche die Sperre erfolgt ist, 1 ist oder größer als 1 ist.It is possible for the control device to block those axial positions which lie in the predetermined range only for the flat rolling stock to be rolled next. Alternatively, the control device can block the corresponding axial positions for several subsequently rolled products. Furthermore, the control device locks the corresponding axial positions for a number of flat rolled products. Afterwards, however, when the corresponding number of further flat rolled products has been rolled, the control device cancels the lock again. This applies regardless of whether the number of flat rolled products for which the block has been made is 1 or greater than 1.

Das Sperren von eigentlich als zulässig eingestuften Axialpositionen wird, wie bereits erwähnt, nur dann vorgenommen, wenn nach dem Sperren noch mindestens eine als zulässig eingestufte Axialposition verbleibt. In der Regel sperrt die Steuereinrichtung zumindest die aktuelle Axialposition, bei der das unmittelbar zuvor gewalzte flache Walzgut gewalzt wird. Es sind jedoch auch andere Kriterien möglich, dass beispielsweise das Sperren von Axialpositionen durch den Bediener Vorrang hat. Die Priorisierung kann fest vorgegeben sein oder vom Bediener vorgegeben werden.The locking of axial positions actually classified as permissible is, as already mentioned, only carried out if at least one axial position classified as permissible remains after the locking. As a rule, the control device blocks at least the current axial position in which the flat rolled material that was rolled immediately before is rolled. However, other criteria are also possible, such that, for example, the blocking of axial positions by the operator has priority. The prioritization can be fixed or specified by the operator.

Die Aufgabe wird weiterhin durch ein Steuerprogramm mit den Merkmalen des Anspruchs 11 gelöst. Erfindungsgemäß bewirkt die Abarbeitung des Steuerprogramms, dass die Steuereinrichtung ein erfindungsgemäßes Verfahren ausführt.The object is also achieved by a control program with the features of claim 11. According to the invention, the processing of the control program has the effect that the control device executes a method according to the invention.

Die Aufgabe wird weiterhin durch eine Steuereinrichtung mit den Merkmalen des Anspruchs 12 gelöst. Erfindungsgemäß ist die Steuereinrichtung derart ausgebildet, dass sie ein erfindungsgemäßes Verfahren ausführt. Insbesondere kann die Steuereinrichtung mit einem erfindungsgemäßen Steuerprogramm programmiert sein.The object is also achieved by a control device having the features of claim 12. According to the invention, the control device is designed such that it executes a method according to the invention. In particular, the control device can be programmed with a control program according to the invention.

Die Aufgabe wird weiterhin durch ein Walzgerüst zum Walzen eines flachen Walzguts mit den Merkmalen des Anspruchs 13 gelöst. Erfindungsgemäß wird das Walzgut von einer erfindungsgemäßen Steuereinrichtung gesteuert.The object is also achieved by a roll stand for rolling flat rolling stock with the features of claim 13. According to the invention, the rolling stock is controlled by a control device according to the invention.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Die oben beschriebenen Eigenschaften, Merkmale und Vorteile dieser Erfindung sowie die Art und Weise, wie diese erreicht werden, werden klarer und deutlicher verständlich im Zusammenhang mit der folgenden Beschreibung der Ausführungsbeispiele, die in Verbindung mit den Zeichnungen näher erläutert werden. Hierbei zeigen in schematischer Darstellung:

FIG 1
ein Walzgerüst von der Seite,
FIG 2
das Walzgerüst von FIG 1 von vorne,
FIG 3
ein weiteres Walzgerüst von der Seite,
FIG 4
das Walzgerüst von FIG 3 von vorne,
FIG 5
ein Paar Walzen,
FIG 6
ein Ablaufdiagramm,
FIG 7
einen Verlauf eines Qualitätsmaßes als Funktion der Axialposition und
FIG 8
ein Paar Arbeitswalzen und ein flaches Walzgut.
The above-described properties, features and advantages of this invention as well as the manner in which they are achieved will become more clearly and clearly understood in connection with the following description of the exemplary embodiments, which are explained in more detail in connection with the drawings. Here show in a schematic representation:
FIG 1
a roll stand from the side,
FIG 2
the roll stand of FIG 1 from the front,
FIG 3
another roll stand from the side,
FIG 4
the roll stand of FIG 3 from the front,
FIG 5
a pair of rollers,
FIG 6
a flow chart,
FIG 7
a course of a quality measure as a function of the axial position and
FIG 8
a pair of work rolls and a flat rolling stock.

Beschreibung der AusführungsformenDescription of the embodiments

Gemäß den FIG 1 bis 4 soll in einem Walzgerüst 1 ein flaches Walzgut 2 gewalzt werden. Das Walzgerüst 1 weist zumindest ein Paar von Walzen 4, 5 auf, zwischen denen sich das flache Walzgut 2 befindet. Prinzipiell ist es möglich, dass nur die Walzen 4, 5 vorhanden sind, dass das Walzgerüst 1 also als Duogerüst ausgebildet ist. In der Regel ist jedoch zusätzlich ein Paar Stützwalzen 3 vorhanden. In diesem Fall sind die Walzen 4, 5 zwischen den Stützwalzen 3 und dem flachen Walzgut 2 angeordnet. Insbesondere sind entsprechend der Darstellung in den FIG 1 bis 4 in der Regel zumindest Arbeitswalzen 4 vorhanden, d.h. Walzen, die im Betrieb im direkten Kontakt mit dem flachen Walzgut 2 stehen. Wenn, wie in den FIG 1 und 2 dargestellt, außer den Stützwalzen 3 nur die Arbeitswalzen 4 vorhanden sind, handelt es sich bei dem Walzgerüst 1 um ein Quartogerüst. Wenn, wie in den FIG 3 und 4 dargestellt, zusätzlich zu den Stützwalzen 3 und den Arbeitswalzen 4 auch Zwischenwalzen 5 vorhanden sind, handelt es sich bei dem Walzgerüst 1 um ein Sextogerüst.According to the FIGS. 1 to 4 a flat rolling stock 2 is to be rolled in a roll stand 1. The roll stand 1 has at least one pair of rolls 4, 5, between which the flat rolling stock 2 is located. In principle, it is possible that only the rolls 4, 5 are present, that the roll stand 1 is designed as a dual stand. As a rule, however, there is also a pair of backup rollers 3. In this case, the rolls 4, 5 are arranged between the backup rolls 3 and the flat rolling stock 2. In particular, as shown in FIGS. 1 to 4 as a rule, at least work rolls 4 are present, ie rolls which are in direct contact with the flat rolling stock 2 during operation. If, as in the FIGS. 1 and 2 shown, except for the backup rolls 3 only the work rolls 4 are present, the roll stand 1 is a Quarto scaffolding. If, as in the FIGS 3 and 4 shown, in addition to the backup rolls 3 and the work rolls 4 and intermediate rolls 5 are present, the roll stand 1 is a six-high stand.

Die vorliegende Erfindung wird nachfolgend in Verbindung mit Ausgestaltungen erläutert, bei denen - sowohl für ein Quartogerüst als auch für ein Sextogerüst - die Arbeitswalzen 4 axial gegenläufig verschiebbar sind. Im Falle eines Sextogerüsts ist es jedoch - sei es alternativ, sei es zusätzlich zu den Arbeitswalzen 4 - ebenso möglich, dass die Zwischenwalzen 5 axial verschiebbar sind.The present invention is explained below in connection with embodiments in which - both for a four-high stand and for a six-high stand - the work rolls 4 can be axially displaced in opposite directions. In the case of a six-high stand, however, it is also possible - be it as an alternative or in addition to the work rolls 4 - for the intermediate rolls 5 to be axially displaceable.

Weiterhin wird im Rahmen der nachfolgenden Erläuterung der Erfindung zwischen verschiedenen Walzgütern 2 unterschieden. Hierbei ist es möglich, dass die verschiedenen Walzgüter 2 physikalisch voneinander getrennte Walzgüter 2 sind, so dass zwischen dem Walzen eines Walzgut 2 und dem Walzen des nachfolgenden Walzguts 2 zwangsweise eine längere oder kürzere Walzpause liegt. Es ist jedoch ebenso möglich, dass die Unterteilung in verschiedene Walzgüter 2 rein fiktiver Art ist, dass also ein längeres Walzgut 2 nur gedanklich in verschiedene kürzere Walzgüter 2 unterteilt wird.Furthermore, in the context of the following explanation of the invention, a distinction is made between different rolling stock 2. It is possible here for the different rolled goods 2 to be physically separate rolling goods 2, so that there is necessarily a longer or shorter rolling pause between the rolling of a rolling stock 2 and the rolling of the subsequent rolling stock 2. However, it is also possible that the subdivision into different rolled products 2 is of a purely fictitious nature, that is to say that a longer rolled product 2 is only conceptually subdivided into various shorter rolled products 2.

Gemäß den FIG 2 und 4 sind, wie bereits erwähnt, die Arbeitswalzen 4 axial gegenläufig verschiebbar. Der entsprechende Verschiebezustand wird nachfolgend als Axialposition x bezeichnet. "Axialposition" wird im Rahmen der vorliegenden Erfindung also nicht im Sinne einer bestimmten Stelle entlang eines Walzenballens einer Walze 3, 4, 5 oder über die Breite des flachen Walzguts 2 verwendet, sondern im Sinne einer bestimmten Schiebeposition der einen Arbeitswalze 4 gegenüber der anderen Arbeitswalze 4.According to the FIG 2 and 4th are, as already mentioned, the work rolls 4 axially displaceable in opposite directions. The corresponding displacement state is referred to below as the axial position x. "Axial position" is not used in the context of the present invention in the sense of a specific point along a roll barrel of a roll 3, 4, 5 or across the width of the flat rolling stock 2, but in the sense of a specific shift position of one work roll 4 relative to the other work roll 4th

Die Arbeitswalzen 4 können nach Bedarf mit einer bestimmten Kontur versehen sein. Beispielsweise können Sie mit einer zylindrischen Kontur versehen sein . Entsprechend der Darstellung in FIG 5 sind die Arbeitswalzen 4 über ihre Ballenlänge mit einer flaschenhalsartig gekrümmten Kontur versehen. Derartige flaschenhalsartige Konturen sind in Fachkreisen beispielsweise als CVC-Schliff und als SmartCrown-Schliff bekannt. Die Konturen der Arbeitswalzen 4 ergänzen sich im belastungsfreien Zustand des Walzgerüsts 1 in der Regel bei einer (1) Axialposition x komplementär. Es sind jedoch auch Ausgestaltungen möglich, bei denen die Ergänzung nicht komplementär ist und/oder erst im belasteten Zustand des Walzgerüsts 1 auftritt. Weiterhin können die gekrümmten Konturen an ihren axialen Enden Anfasungen oder allmähliche Übergänge aufweisen. Unabhängig von der konkreten Ausgestaltung der Konturen der Arbeitswalzen 4 bilden die Arbeitswalzen 4 jedoch einen parabelförmigen Walzspalt, wobei das Ausmaß der Parabolizität im Falle der flaschenhalsartigen Konturen vom Ausmaß der axialen Verschiebung der Arbeitswalzen 4 abhängt.The work rolls 4 can be provided with a specific contour as required. For example, they can be provided with a cylindrical contour. According to the representation in FIG 5 are the work rolls 4 over their barrel length provided with a bottle neck-like curved contour. Such bottle neck-like contours are known in specialist circles, for example, as CVC cuts and SmartCrown cuts. The contours of the work rolls 4 complement each other in the load-free state of the roll stand 1, as a rule, at one (1) axial position x. However, configurations are also possible in which the addition is not complementary and / or only occurs when the roll stand 1 is under load. Furthermore, the curved contours can have chamfers or gradual transitions at their axial ends. Regardless of the specific design of the contours of the work rolls 4, however, the work rolls 4 form a parabolic roll gap, the extent of the parabolism in the case of the bottle neck-like contours depending on the extent of the axial displacement of the work rolls 4.

Das Walzgerüst 1 weist entsprechend der Darstellung in den FIG 1 bis 4 weiterhin ein Biegesystem 6 auf. Mittels des Biegesystems 6 können in an sich bekannter Weise die Arbeitswalzen 4 in definierter Weise gebogen werden. Auch durch das Biegesystem 6 kann insbesondere dem Walzspalt eine Parabelform aufgeprägt werden. Innerhalb gewisser Grenzen können daher die Wirkung der axialen Verschiebung der Arbeitswalzen 4 auf der einen Seite und die Wirkung des Biegesystems 6 auf der anderen Seite sich gegenseitig verstärken oder gegenseitig kompensieren, je nach Art und Ausmaß der jeweiligen Ansteuerung eines Schiebesystems 7, mit dem die Arbeitswalzen 4 verschoben werden können, und des Biegesystems 6. Mittels beider Systeme 6, 7 kann somit insbesondere die Walzspaltkontur eingestellt werden.The roll stand 1 has, as shown in FIG FIGS. 1 to 4 furthermore 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. A parabolic shape can also be impressed in particular on the roll gap by the bending system 6. Therefore, within certain limits, 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 hand can mutually reinforce or compensate each other, depending on the type and extent of the respective control of a sliding system 7 with which the work rolls 4 can be moved, and the bending system 6. By means of both systems 6, 7, in particular, the roll gap contour can be adjusted.

Das Walzgerüst 1 wird von einer Steuereinrichtung 8 gesteuert. Insbesondere das Biegesystem 6 und das Schiebesystem 7 werden von der Steuereinrichtung 8 gesteuert. Die Steuereinrichtung 8 ist derart ausgebildet, dass sie im Betrieb ein Verfahren ausführt, das nachstehend näher erläutert wird. Insbesondere kann die Steuereinrichtung 8 zu diesem Zweck mit einem Steuerprogramm 9 programmiert sein. Das Steuerprogramm umfasst in diesem Fall Maschinencode 10, der von der Steuereinrichtung 8 abarbeitbar ist. Die Abarbeitung des Maschinencodes 10 durch die Steuereinrichtung 8 bewirkt in diesem Fall, dass die Steuereinrichtung 8 das entsprechende Verfahren ausführt, welches insbesondere die Steuerung des Biegesystems 6 und des Schiebesystems 7 umfasst.The roll stand 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 control device 8 is designed in such a way that it executes a method during operation that is explained in more detail below. In particular, the control device 8 can be programmed with a control program 9 for this purpose. The control program in this case comprises machine code 10 which can be processed by the control device 8. In this case, the processing of the machine code 10 by the control device 8 causes the control device 8 to carry out the corresponding method, which in particular includes the control of the bending system 6 and the sliding system 7.

Gemäß FIG 6 ermittelt die Steuereinrichtung 8 in einem Schritt S1 für eine Vielzahl von Axialpositionen x der Arbeitswalzen 4 (definiert durch eine jeweilige Ansteuerung des Schiebesystems 7), durch welche jeweilige Ansteuerung des Biegesystems 6 die Walzspaltkontur einer vorgegebenen Soll-Walzspaltkontur optimal angenähert wird. Sie ermittelt zugleich auch ein Qualitätsmaß A für die Übereinstimmung der sich ergebenden Walzspaltkontur mit der Soll-Walzspaltkontur. Der entsprechende Sachverhalt ist in FIG 7 durch ein entsprechendes Qualitätsmaß A als Funktion über die Axialpositionen x dargestellt. Die Steuereinrichtung 8 kann das Qualitätsmaß A beispielsweise mittels einer Kostenfunktion ermitteln. In diesem Fall gehen in die Kostenfunktion insbesondere an einer Anzahl von Stützstellen über die Breite des flachen Walzguts 2 die jeweilige lokale Abweichung der Walzspaltkontur von der Soll-Walzspaltkontur ein. Die Anzahl an Stützstellen über der Breite des flachen Walzguts 2, an denen die Steuereinrichtung 8 jeweils die jeweilige lokale Abweichung der Walzspaltkontur von der Soll-Walzspaltkontur ermittelt, liegt in der Regel bei mindestens 5 Stellen, besser bei mindestens 10 Stellen. In vielen Fällen wird der Vergleich sogar an einer noch erheblich größeren Anzahl durchgeführt, beispielsweise bei 20, 50 oder noch mehr Stützstellen.According to FIG 6 In a step S1, the control device 8 determines for a large number of axial positions x of the work rolls 4 (defined by a respective control of the sliding system 7), by means of which control of the bending system 6 the roll gap contour is optimally approximated to a predetermined desired roll gap contour. At the same time, it also determines a quality measure A for the conformity of the resulting roll gap contour with the target roll gap contour. The relevant facts are in FIG 7 represented by a corresponding 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 desired roll gap contour is included in the cost function, in particular at a number of support points over the width of the flat rolling stock 2. The number of support points across the width of the flat rolling stock 2, at which the control device 8 determines the respective local deviation of the roll gap contour from the target roll gap contour, is usually at least 5 places, better at least 10 places. In many cases, the comparison is even carried out on a considerably larger number, for example with 20, 50 or even more support points.

Zusätzlich können in die Kostenfunktion weitere Größen eingehen, beispielsweise ein Ausmaß und/oder eine Geschwindigkeit, mit der die Axialposition x, ausgehend von einer aktuellen axialen Positionierung - also der Positionierung des entsprechenden Stellsystems 6, 7 zum Zeitpunkt des Walzens des unmittelbar zuvor gewalzten flachen Walzguts 2 (nachfolgend als Walzgut 2A bezeichnet) -, verstellt werden muss.In addition, other 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 - that is, the positioning of the corresponding positioning system 6, 7 at the time of rolling the flat rolled stock that was rolled immediately before 2 (hereinafter referred to as rolling stock 2A) - must be adjusted.

Die Steuereinrichtung 8 kann die Axialpositionen x diskret - beispielsweise innerhalb des möglichen Verschiebebereichs der Arbeitswalzen 4 alle 5 mm, alle 10 mm oder alle 20 mm - oder kontinuierlich festlegen. Im letztgenannten Fall erfolgt in der Regel eine Ermittlung des Qualitätsmaßes A nur für Stützstellen der Axialposition x. Zwischen den Stützstellen interpoliert die Steuereinrichtung 8 das Qualitätsmaß A.The control device 8 can determine 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, the quality measure A is usually only determined for support points of the axial position x. The control device 8 interpolates the quality measure A between the support points.

Die Steuereinrichtung 8 führt den Schritt S1 vor dem Walzen des jeweiligen flachen Walzguts 2 aus (nachfolgend als Walzgut 2B bezeichnet). In der Regel führt die Steuereinrichtung 8 den Schritt S1 weiterhin nach dem Walzen des unmittelbar zuvor gewalzten Walzguts 2A aus.The control device 8 executes the step S1 before the rolling of the respective flat rolling stock 2 (hereinafter referred to as rolling stock 2B). As a rule, the control device 8 continues to carry out step S1 after the rolling stock 2A that was rolled immediately before has been rolled.

Die Steuereinrichtung 8 beachtet im Rahmen der Ausführung des Schrittes S1 technologische Randbedingungen. Derartige Randbedingungen können insbesondere darin bestehen, in welchem Ausmaß das Biegesystem 6 und/oder das Schiebesystem 7 überhaupt angesteuert werden können, also der maximal mögliche Schiebehub und der maximal mögliche Biegehub. Alternativ und insbesondere zusätzlich können die Randbedingungen darin bestehen, dass unter Berücksichtigung einer maximalen Verstellgeschwindigkeit für das Schiebesystem 7 der mögliche Bereich an Axialpositionen x beschränkt wird und/oder unter Berücksichtigung einer maximalen Verstellgeschwindigkeit für das Biegesystem 6 eine Beschränkung der erreichbaren Walzspaltkontur vorgenommen wird.The control device 8 observes technological boundary conditions in the course of executing step S1. Such boundary conditions can in particular consist of the extent to which the bending system 6 and / or the sliding system 7 can be controlled at all, that is to say the maximum possible sliding stroke and the maximum possible bending stroke. Alternatively and in particular in addition, the boundary conditions can 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 the achievable roll gap contour is restricted, taking into account a maximum adjustment speed for the bending system 6.

In einem Schritt S2 ermittelt die Steuereinrichtung 8 diejenigen Axialpositionen x, bei denen das (im wesentlichen auf der Abweichung der sich ergebenden Walzspaltkontur von der Soll-Walzspaltkontur basierenden) Qualitätsmaß A unterhalb einer vorgegebenen Schranke MAX liegt. Diese Axialpositionen x stellen die Gesamtmenge der zulässigen Axialpositionen x dar.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 permissible axial positions x.

In einem Schritt S3 entfernt die Steuereinrichtung 10 sodann aus der Menge der zulässigen Axialpositionen x gesperrte Axialpositionen x.In a step S3, the control device 10 then removes blocked axial positions x from the set of permissible axial positions x.

Beispielsweise kann die Steuereinrichtung 8 im Rahmen des Schrittes S3 von einem Bediener 11 einen Sperrbefehl C entgegennehmen (siehe FIG 1 und 3). In diesem Fall sperrt die Steuereinrichtung 8 die in dem Sperrbefehl C spezifizierten Axialpositionen x. Beispielsweise kann die Steuereinrichtung 8 aufgrund der Vorgabe des Bedieners 11 die in FIG 7 mit dem Buchstaben A ergänzte Axialposition x sperren.For example, the control device 8 can receive a blocking command C from an operator 11 as part of step S3 (see FIG FIG 1 and 3 ). In this case, the control device 8 blocks the axial positions x specified in the blocking command C. For example, the control device 8 can, based on the specification of the operator 11, the in FIG 7 Block axial position x supplemented with the letter A.

Alternativ oder zusätzlich ist es möglich, dass die Steuereinrichtung 8 entsprechend der Darstellung in FIG 8 (mindestens) eine resultierende Kante 12 der Arbeitswalzen 4 ermittelt und prüft, bei welcher Axialposition x einer der Arbeitswalzen 4 die resultierende Kante 12 auf einer Walzgutkante 13 des zu walzenden Walzguts 2B positioniert würde. In diesem Fall sperrt die Steuereinrichtung 8 entsprechend der Darstellung in FIG 7 beispielsweise die in FIG 7 mit dem Buchstaben B ergänzte Axialposition x. Es ist möglich, dass die Steuereinrichtung 8 im Rahmen der Ermittlung der resultierenden Kante 12 nur den Verschleiß der Arbeitswalzen 4 berücksichtigt. Vorzugsweise ermittelt die Steuereinrichtung 8 die resultierende Kante 12 jedoch unter Berücksichtigung des Schliffs, der thermischen Balligkeit und/oder des Verschleißes der Arbeitswalzen 4.Alternatively or additionally, it is possible that the control device 8 according to the representation in FIG 8 (At least) one resulting edge 12 of the work rolls 4 is determined and checks at which axial position x one of the work rolls 4 the resulting edge 12 would be positioned on a rolling stock edge 13 of the rolling stock 2B to be rolled. In this case, the control device 8 locks as shown in FIG FIG 7 for example the in FIG 7 Axial position x supplemented with the letter B. It is possible that the control device 8 only takes into account the wear of the work rolls 4 when determining the resulting edge 12. The control device 8 preferably determines the resulting edge 12, however, taking into account the cut, the thermal crown and / or the wear of the work rolls 4.

Alternativ oder zusätzlich ist es möglich, dass die Steuereinrichtung 8 entsprechend der Darstellung in FIG 7 diejenigen Axialpositionen x sperrt, die sich in einem vorbestimmten Bereich um diejenige Axialposition x herum befinden, bei der das unmittelbar zuvor gewalzte flache Walzgut 2A - hier also das flache Walzgut 2A - gewalzt wird. Beispielsweise kann die Steuereinrichtung 8 diejenigen Axialposition x sperren, deren Abstand a unterhalb eines Minimalabstands amin von derjenigen Axialposition x liegt, bei der das unmittelbar zuvor gewalzte flache Walzgut 2 gewalzt wird. In FIG 7 sind dies die mit dem Buchstaben C ergänzten Axialpositionen x.Alternatively or additionally, it is possible that the control device 8 according to the representation in FIG 7 blocks those axial positions x which are located in a predetermined area around that axial position x at which the flat rolling stock 2A rolled immediately before - in this case the flat rolling stock 2A - is rolled. For example, the control device 8 can block that 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 stock 2 is rolled. In FIG 7 these are the axial positions x supplemented with the letter C.

Im letztgenannten Fall - also der Sperre in Abhängigkeit von dem vorbestimmten Bereich - ist es möglich, dass die Sperre nur für das als nächstes zu walzende flache Walzgut 2 - also das flache Walzgut 2B - gilt. Alternativ ist es möglich, die Sperre für eine vorbestimmte Anzahl von flachen Walzgütern 2 - beispielsweise für das flache Walzgut 2B und die nächsten beiden flachen Walzgüter 2 - aufrechtzuerhalten. Danach hebt die Steuereinrichtung 8 jedoch die Sperre selbsttätig wieder auf. Weiterhin kann die Dauer der Sperre eine Funktion von Vorzeichen und/oder Betrag des Abstands a sein, insbesondere mit zunehmendem Abstand a abnehmen.In the latter case - that is, the lock as a function of the predetermined range - it is possible that the lock only applies 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 flat rolled products 2B and the next two flat rolled products 2. However, the control device 8 then automatically releases the lock again. Furthermore, the duration of the block can be a function of the sign and / or amount of the distance a, in particular decrease with increasing distance a.

Das Ausmaß, in dem die Steuereinrichtung 8 im Schritt S3 Axialpositionen x sperrt, kann nach Bedarf bestimmt sein. Unabhängig vom Ausmaß der Sperren wird das Sperren jedoch nur soweit durchgeführt, dass auch nach dem Entfernen der gesperrten Axialpositionen x aus der Menge der als zulässig eingestuften Axialpositionen x noch mindestens eine Axialposition x verbleibt, also mindestens eine Axialposition x, die sowohl zulässig als auch nicht gesperrt ist. Anders ausgedrückt: Wenn nur eine einzige Axialposition x zulässig ist, darf diese Axialposition x im Schritt S3 nicht gesperrt werden, da anderenfalls für das Walzen des flachen Walzguts 2 keine zulässige Axialposition x mehr zur Verfügung stünde. Wenn die Anzahl an zulässigen Axialpositionen x hingegen größer als 1 ist, wird im Schritt S3 mindestens eine (prinzipiell zulässige) Axialposition x gesperrt. Das Sperren von Axialpositionen x wird jedoch nur in dem Umfang durchgeführt, dass auch dann immer noch mindestens eine Axialposition x zulässig bleibt. Vorrangig wird beim Sperren weiterhin in der Regel diejenige Axialposition x gesperrt, bei welcher das unmittelbar zuvor gewalzte flache Walzgut 2 - hier also das flache Walzgut 2A - gewalzt wird. Es sind prinzipiell aber auch andere Priorisierungen möglich.The extent to which the control device 8 blocks axial positions x in step S3 can be determined as required. Regardless of the extent of the blocking, the blocking is only carried out to the extent that after removing the blocked axial positions x from the set of axial positions x classified as permissible, at least one axial position x remains, i.e. at least one axial position x that is both permissible and not Is blocked. In other words, if only a single axial position x is permissible, this axial position x must not be blocked in step S3, since otherwise no more permissible axial position x would be available for the rolling of the flat rolling stock 2. If, on the other hand, the number of permissible axial positions x is greater than 1, at least one (principally permissible) axial position x is blocked in step S3. The blocking of axial positions x is only carried out to the extent that at least one axial position x still remains permissible. When locking, the axial position x at which the flat rolling stock 2 rolled immediately beforehand - that is to say here the flat rolling stock 2A - is rolled is still primarily blocked. In principle, however, other prioritizations are also possible.

Weiterhin ist das Sperren von Axialpositionen x nicht einfach optional, sondern zwingend, sofern überhaupt die Möglichkeit zum Sperren von Axialpositionen x besteht. Die Steuereinrichtung 8 prüft im Rahmen des Schrittes S3 also stets, ob die Anzahl an zulässigen Axialpositionen x größer als 1 ist. Wenn dies der Fall ist, wird mindestens eine Axialposition x gesperrt. Wenn dies hingegen nicht der Fall ist - aber auch nur dann -, unterbleibt das Sperren der in diesem Fall einzigen zulässigen Axialposition x.Furthermore, the locking of axial positions x is not simply optional, but compulsory if there is any possibility of locking axial positions x. The control device 8 therefore always checks in the context of step S3 whether the number of permissible axial positions x is greater than 1. If this is the case, at least one axial position x is blocked. If, on the other hand, this is not the case - but only then - the blocking of the only permissible axial position x in this case does not occur.

In einem Schritt S4 bestimmt die Steuereinrichtung 8 die jeweilige Axialposition x, bei der das nunmehr zu walzende flache Walzgut 2 - gemäß Beispiel also das Walzgut 2B - gewalzt werden soll. Diese Axialposition x wird nachfolgend als resultierende Axialposition x bezeichnet. Die Bestimmung der resultierenden Axialposition x erfolgt durch Auswahl einer der zulässigen und zugleich nicht gesperrten Axialpositionen x. Auch der Schritt S4 wird vor dem Walzen des entsprechenden Walzguts 2 durchgeführt.In a step S4, the control device 8 determines the respective axial position x at which the flat rolling stock 2 that is now to be rolled - that is to say the rolling stock 2B according to the example - is to be rolled. This axial position x is referred to below as the resulting axial position x. The resulting axial position x is determined by selecting one of the permissible and at the same time unlocked axial positions x. Step S4 is also carried out before the rolling stock 2 is rolled.

Die Art und Weise, auf welche die Steuereinrichtung 8 die resultierende Axialposition x bestimmt, kann beispielsweise auf stochastischer Basis erfolgen. Alternativ kann die Steuereinrichtung 8 für die Axialpositionen x anhand eines Bewertungskriteriums eine Bewertung ermitteln und den Axialpositionen x zuordnen. In diesem Fall bestimmt die Steuereinrichtung 8 die resultierende Axialposition x anhand der Bewertung. Es ist ausreichend, die Bestimmung und Zuordnung der Bewertung nur für die verbleibenden Axialpositionen x durchzuführen, also die zulässigen und zugleich nicht gesperrten Axialpositionen x. Denn auch die Bestimmung der resultierenden Axialposition x erfolgt nur unter Berücksichtigung dieser Axialpositionen x.The manner in which the control device 8 determines the resulting axial position x can for example take place on a stochastic basis. Alternatively, the control device 8 can determine an evaluation for the axial positions x on the basis of an evaluation criterion and assign it to the axial positions x. In this case, the control device 8 determines the resulting axial position x on the basis of the evaluation. It is sufficient to determine and assign the evaluation only for the remaining axial positions x, that is, the permissible and at the same time not blocked axial positions x. This is because the resulting axial position x is only determined taking into account these axial positions x.

Die Bewertung kann nach Bedarf bestimmt sein. Vorzugsweise ermittelt die Steuereinrichtung 8 die Bewertung anhand technologischer Kriterien, insbesondere des Qualitätsmaßes A.The rating can be determined as needed. The control device 8 preferably determines the evaluation on the basis of technological criteria, in particular the quality measure A.

In einem Schritt S5 gibt die Steuereinrichtung 8 schließlich dem Walzgerüst 1 als Axialposition x zum Walzen des flachen Walzguts 2 - gemäß Beispiel des Walzguts 2B - die resultierende Axialposition x vor. Das entsprechende Walzgut 2 wird somit mit dieser Axialposition x der Arbeitswalzen 4 und dem hiermit korrespondierenden, im Rahmen des Schrittes S1 bestimmten Zustand des Biegesystems 6 in dem Walzgerüst 1 gewalzt.In a step S5, the control device 8 finally specifies the resulting axial position x for the rolling stand 1 as the axial position x for rolling the flat rolling stock 2 - according to the example of the rolling stock 2B. The corresponding rolling stock 2 is thus rolled in the rolling stand 1 with this axial position x of the work rolls 4 and the corresponding state of the bending system 6 determined in the context of step S1.

Die vorliegende Erfindung wurde obenstehend der Art erläutert, dass die Arbeitswalzen 4 die axial verschiebbaren Walzen sind. Im Falle eines Sextogerüsts ist es jedoch möglich, dass die Zwischenwalzen 5 axial verschiebbar sind. In diesem Fall erfolgt die Ausführung des erfindungsgemäßen Verfahrens bezüglich der Zwischenwalzen 5. im Falle eines Sextogerüsts ist es sogar möglich, dass sowohl die Arbeitswalzen 4 als auch die Zwischenwalzen 5 axial verschiebbar sind. In diesem Fall kann die Ausführung des erfindungsgemäßen Verfahrens sowohl bezüglich der Arbeitswalzen 4 als auch bezüglich der Zwischenwalzen 5 erfolgen.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 six-high stand, however, it is possible for the intermediate rolls 5 to be axially displaceable. In this case, the method according to the invention is carried out with respect to the intermediate rolls 5. In the case of a six-high stand, it is even possible for both the work rolls 4 and the intermediate rolls 5 to be axially displaceable. In this case, the method according to the invention can be carried out both with respect to the work rolls 4 and with respect to the intermediate rolls 5.

Die vorliegende Erfindung weist viele Vorteile auf. Insbesondere kann auf einfache und zuverlässige Weise gewährleistet werden, dass der Verschleiß der Arbeitswalzen 4 und/oder der Zwischenwalzen 5 über einen großen Bereich ihrer axialen Erstreckung verschmiert wird, so dass sich nirgends eine signifikante Verschleißkante ausbilden kann. Bei Bedarf ist es sogar möglich, die Axialposition x sequenziell nacheinander derart zu bestimmen, dass ganz gezielt auf einen gewünschten Walzenverschleiß hin gearbeitet wird. Durch die verschiedenen Möglichkeiten, Axialpositionen x zu sperren, und die verschiedenen Möglichkeiten, aus den verbleibenden Axialpositionen x die resultierende Axialposition x zu bestimmen, ergibt sich eine hohe Flexibilität, so dass die erfindungsgemäße Vorgehensweise ohne weitergehende Modifikationen bei der Vielzahl von Walzgerüsten anwendbar ist.The present invention has many advantages. In particular, it can be ensured in a simple and reliable way that the wear of the work rolls 4 and / or the intermediate rolls 5 is smeared over a large area of their axial extent, so that a significant wear edge cannot develop anywhere. If necessary, it is even possible to determine the axial position x sequentially one after the other in such a way that work is carried out in a very targeted manner towards a desired roller wear. The various options for locking axial positions x and the various options for determining the resulting axial position x from the remaining axial positions x result in a high degree of flexibility, so that the procedure according to the invention can be applied to the large number of roll stands without further modifications.

Obwohl die Erfindung im Detail durch das bevorzugte Ausführungsbeispiel näher illustriert und beschrieben wurde, so ist die Erfindung nicht durch die offenbarten Beispiele eingeschränkt und andere Varianten können vom Fachmann hieraus abgeleitet werden, ohne den Schutzumfang der Erfindung zu verlassen.Although the invention has been illustrated and described in more detail by the preferred exemplary embodiment, the invention is not restricted by the disclosed examples and other variants can be derived therefrom by the person skilled in the art without departing from the scope of protection of the invention.

BezugszeichenlisteList of reference symbols

11
WalzgerüstRoll stand
22
flache Walzgüterflat rolled goods
33
StützwalzenBackup rolls
44th
ArbeitswalzenWork rolls
55
ZwischenwalzenIntermediate rolls
66
BiegesystemBending system
77th
SchiebesystemSliding system
88th
SteuereinrichtungControl device
99
SteuerprogrammControl program
1010
MaschinencodeMachine code
1111
Bedieneroperator
1212
resultierende Kanteresulting edge
1313th
WalzgutkanteRolled edge
aa
Abstanddistance
aminamine
MinimalabstandMinimum distance
AA.
QualitätsmaßQuality measure
MAXMAX
SchrankeCabinets
S1 bis S5S1 to S5
Schrittesteps
x, xA, xB, xCx, xA, xB, xC
AxialpositionenAxial positions

Claims (13)

  1. Method for rolling a flat rolled product (2) in a rolling stand (1), wherein the rolling stand (1) has at least one pair of rollers (4, 5), wherein the flat rolled product (2) is situated between the two rollers (4, 5), wherein the rollers (4, 5) are axially displaceable in opposite directions, wherein the rolling stand (1) has a bending system (6) for the rollers (4, 5),
    - wherein a control device (8) of the rolling stand (1) for controlling the rolling gap contour uses as adjusting mechanisms the bending and the axial displacement of the rollers (4, 5),
    - wherein, prior to the rolling of a respective rolled product (2), the control device (8) determines a respective axial position (x) as the resulting axial position (x) and prescribes it for the rolling stand (1) as axial position (x) of the rollers (4, 5) for rolling the next flat rolled product (2),
    characterized
    - in that, prior to the rolling of the respective rolled product (2), the control device (8) determines for a multiplicity of axial positions (x) of the rollers (4, 5) how far a predetermined target rolling gap contour can be approximated by actuating the adjusting mechanisms (6, 7) while taking account of technological boundary conditions,
    - in that the control device (8) classifies those axial positions (x) as permissible in which a deviation of the resulting rolling gap contour from the target rolling gap contour lies below a predetermined limit,
    - in that the control device (8) removes blocked axial positions (x) from the set of the axial positions (x) classified as permissible insofar as at least one axial position (x) classified as permissible still remains even after the removal of the blocked axial positions (x), and
    - in that the control device (8) determines one of the remaining axial positions (x) as the resulting axial position (x).
  2. Method according to Claim 1,
    characterized
    in that the rolling stand has backup rollers (3) in addition to the rollers (4, 5), wherein the rollers (4, 5) are in each case arranged between the backup rollers (3) and the rolled product (2).
  3. Method according to Claim 1 or 2,
    characterized
    in that the rollers (4, 5) are provided with a contour which is curved in the manner of a bottleneck.
  4. 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. Method according to Claim 1, 2 or 3,
    characterized
    in that the control device (8) assigns an evaluation to at least the remaining axial positions (x) on the basis of an evaluation criterion, and in that the control device (8) determines the resulting axial position (x) on the basis of the evaluation.
  6. Method according to Claim 5,
    characterized
    in that 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 blocking command (C) from an operator (11), and in that the control device (8) blocks axial positions (x) specified in the blocking command (C).
  8. Method according to one of the above claims,
    characterized
    in that the control device (8) determines a resulting edge (12) of one of the rollers (4, 5) while taking into consideration a camber, a thermal crown and/or a wear of the rollers (4, 5), and in that the control device (8) blocks those axial positions (x) in which the resulting edge (12) of one of the rollers (4, 5) would be positioned on a rolled product edge (13) of the flat rolled product (2).
  9. Method according to one of the above claims,
    characterized
    in that the control device (8) blocks those axial positions (x) which are situated in a predetermined region around that axial position (x) in which the flat rolled product (2A) that was rolled immediately beforehand is rolled.
  10. Method according to Claim 9,
    characterized
    in that the control device (8) blocks those axial positions (x) whose spacing (a) is situated below the minimum spacing (amin) from that axial position (x) in which the flat rolled product (2A) that was rolled immediately beforehand is rolled, for a predetermined number of flat rolled products (2) and then cancels the block 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) has the effect that the control device (8) carries out a method according to one of the above claims.
  12. Control device for a rolling stand (1), wherein the control device is designed in such a way that in operation it carries out a method according to one of Claims 1 to 8, in particular is programmed with a control program (9) according to Claim 11.
  13. Rolling stand for rolling a flat rolled product (2),
    - wherein the rolling stand has a pair of rollers (4, 5),
    - wherein the flat rolled product (2) is situated between the two rollers (4, 5),
    - wherein the rollers (4, 5) are axially displaceable in opposite directions,
    - wherein the rolling stand has a bending system (6) for the rollers (4, 5),
    - wherein the rolling stand is controlled by a control device (8) according to Claim 12.
EP18160879.5A 2018-03-09 2018-03-09 Avoidance of wearing edges when rolling flat rolled products Active EP3536411B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP18160879.5A EP3536411B1 (en) 2018-03-09 2018-03-09 Avoidance of wearing edges when rolling flat rolled products
CN201980018241.XA CN111801173B (en) 2018-03-09 2019-02-14 Edge wear prevention during rolling of flat rolling stock
PCT/EP2019/053618 WO2019170381A1 (en) 2018-03-09 2019-02-14 Preventing worn edges when rolling flat rolled products
US16/970,078 US20210046529A1 (en) 2018-03-09 2019-02-14 Preventing worn edges when rolling flat rolled products

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18160879.5A EP3536411B1 (en) 2018-03-09 2018-03-09 Avoidance of wearing edges when rolling flat rolled products

Publications (2)

Publication Number Publication Date
EP3536411A1 EP3536411A1 (en) 2019-09-11
EP3536411B1 true EP3536411B1 (en) 2020-11-18

Family

ID=61616902

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18160879.5A Active EP3536411B1 (en) 2018-03-09 2018-03-09 Avoidance of wearing edges when rolling flat rolled products

Country Status (4)

Country Link
US (1) US20210046529A1 (en)
EP (1) EP3536411B1 (en)
CN (1) CN111801173B (en)
WO (1) WO2019170381A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4353375A1 (en) * 2022-10-11 2024-04-17 Primetals Technologies Germany GmbH Method for determining actuated variables of a roll stand, corresponding control program, control device with such control program, and rolling stand with such control device

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Publication number Priority date Publication date Assignee Title
DE3620197A1 (en) * 1986-06-16 1987-12-17 Schloemann Siemag Ag ROLLING MILL FOR PRODUCING A ROLLING GOOD, ESPECIALLY A ROLLING STRIP
JPH0620562B2 (en) * 1988-12-28 1994-03-23 住友金属工業株式会社 Sheet crown control method during hot rolling
JPH0615322A (en) * 1992-07-03 1994-01-25 Sumitomo Metal Ind Ltd Sheet crown control method at time of hot rolling
WO1995019591A1 (en) * 1994-01-13 1995-07-20 Siemens Aktiengesellschaft Method and device for running a process
JP3348503B2 (en) * 1994-02-25 2002-11-20 石川島播磨重工業株式会社 Work rolls and roll shift mills for rolling mills
JP2002066608A (en) * 2000-08-30 2002-03-05 Hitachi Ltd Cold rolling mill and rolling method
AT410904B (en) * 2001-03-14 2003-08-25 Voest Alpine Ind Anlagen METHOD AND DEVICE FOR CALCULATING THE ROLLER CONTOUR
CN2698479Y (en) * 2003-11-12 2005-05-11 一重集团大连设计研究院 Working roll bidirectional movement type four rolls cold rolling machine
DE102004031354A1 (en) * 2004-06-28 2006-01-19 Sms Demag Ag Method for rolling strips in a roll stand
JP4447440B2 (en) 2004-12-02 2010-04-07 新日本製鐵株式会社 Online grinding method for work rolls
CN104096712B (en) * 2013-04-12 2016-01-13 张家港浦项不锈钢有限公司 The using method of high-speed steel roll on steekle mill
CN103639201B (en) * 2013-12-04 2015-06-03 武汉科技大学 Method for rolling ultra-thin titanium belt
CN107030112A (en) * 2017-03-07 2017-08-11 重庆市科学技术研究院 A kind of milling method of magnesium alloy ultrathin plate

Non-Patent Citations (1)

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Title
None *

Also Published As

Publication number Publication date
EP3536411A1 (en) 2019-09-11
US20210046529A1 (en) 2021-02-18
CN111801173A (en) 2020-10-20
WO2019170381A1 (en) 2019-09-12
CN111801173B (en) 2022-06-14

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