WO2024078918A1 - Procédé de détermination de grandeurs manipulées d'une cage de laminage, programme de commande correspondant, dispositif de commande comprenant un tel programme de commande, et cage de laminage comprenant un tel dispositif de commande - Google Patents

Procédé de détermination de grandeurs manipulées d'une cage de laminage, programme de commande correspondant, dispositif de commande comprenant un tel programme de commande, et cage de laminage comprenant un tel dispositif de commande Download PDF

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Publication number
WO2024078918A1
WO2024078918A1 PCT/EP2023/077316 EP2023077316W WO2024078918A1 WO 2024078918 A1 WO2024078918 A1 WO 2024078918A1 EP 2023077316 W EP2023077316 W EP 2023077316W WO 2024078918 A1 WO2024078918 A1 WO 2024078918A1
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WO
WIPO (PCT)
Prior art keywords
rolling
rolls
value
initial
control device
Prior art date
Application number
PCT/EP2023/077316
Other languages
German (de)
English (en)
Inventor
Hubertus Grillmeier
Sven Schätzler
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
Publication of WO2024078918A1 publication Critical patent/WO2024078918A1/fr

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Classifications

    • 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
    • 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
    • B21B2269/02—Roll bending; vertical bending of rolls
    • B21B2269/06—Intermediate 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
    • B21B2269/16—Intermediate rolls

Definitions

  • the present invention is based on an operating method for a rolling stand for rolling a flat rolled metal product, wherein the rolling stand has work rolls, backup rolls and intermediate rolls arranged between the work rolls and the backup rolls,
  • control device determines, prior to rolling the flat rolling stock in the rolling stand, taking into account the actual variables, an intermediate roll setting value for an axial displacement of the intermediate rolls, an initial work roll control value for a work roll bending device for bending the work rolls and an initial intermediate roll control value for an intermediate roll bending device for bending the intermediate rolls, for which an expected contour and/or an expected flatness of the flat rolling stock are approximated as closely as possible to the target contour and/or target flatness described by the target variables,
  • control device adjusts the axial displacement of the intermediate rolls in accordance with the determined intermediate roll setting value before rolling the flat rolling stock in the rolling stand
  • control device adjusts the work roll bending device according to the determined initial work roll control value and the intermediate roll bending device according to the determined initial intermediate roll control value, at least at the beginning of the rolling of the flat rolling stock in the rolling stand.
  • the present invention is further based on a control program comprising machine code which can be processed by a control device for a rolling stand for rolling a flat metal rolling stock, said rolling stand comprising work rolls, backup rolls and intermediate rolls arranged between the work rolls and the backup rolls, wherein the processing of the machine code by the control device causes the control device
  • the actual values describe the flat rolling stock before rolling in the rolling stand and the target values describe a target contour and/or a target flatness of the flat rolling stock after rolling in the rolling stand, - before rolling the flat rolling stock in the rolling stand, taking into account the actual values, an intermediate roll setting value for an axial displacement of the intermediate rolls, an initial work roll control value for a work roll bending device for bending the work rolls and an initial intermediate roll control value for an intermediate roll bending device for bending the intermediate rolls are determined, for which an expected contour and/or an expected flatness of the flat rolling stock are approximated as closely as possible to the target contour and/or target flatness described by the target values,
  • the axial displacement of the intermediate rolls is adjusted according to the determined intermediate roll setting value by means of a displacement device (8),
  • the rolling stand has - like every rolling stand - two work rolls, which act directly and immediately (i.e. without other rolls arranged in between) on the flat rolled material.
  • the rolling stand also has two backup rolls, which counteract the deflection of the work rolls. If there were no other rolls, the rolling stand would be a so-called four-high stand. In this case, in addition to the work rolls and the backup rolls, there are two intermediate rolls, which are arranged between the two work rolls and the two backup rolls. The rolling stand is therefore a so-called six-high stand.
  • the actual values that describe the flat rolled stock before rolling in the rolling mill can be, for example, the width, thickness, profile, contour, flatness, temperature, chemical composition, history and others.
  • the flat rolled stock is often made of steel, sometimes of aluminum. In rare cases it can also be another metal, such as copper.
  • the flat rolled stock is usually a strip, in rare cases a heavy plate.
  • the rolling is usually cold rolling. In exceptional cases, however, it can also be hot rolling.
  • the present invention is further based on a control device for a rolling stand for rolling a flat rolled metal stock, wherein the rolling stand has work rolls, backup rolls and intermediate rolls arranged between the work rolls and the backup rolls, wherein the control device is programmed with such a control program so that when the machine code of the control program is processed, it operates the rolling stand according to such an operating method.
  • the present invention further relates to a rolling stand for rolling a flat rolled metal product,
  • the rolling stand comprises working rolls, backup rolls and intermediate rolls arranged between the working rolls and the backup rolls, an intermediate roll bending device (10) for bending the intermediate rolls (5) and a working roll bending device (9) for bending the working rolls (3),
  • the rolling stand has such a control device, by which the rolling stand is operated in operation according to such an operating method.
  • JPS6046804 A the use of a rolling mill equipped with a roll bending device between a work roll and an intermediate roll is shown to improve the accuracy of the sheet thickness in the longitudinal direction of a sheet to be rolled.
  • the sheet is rolled by controlling a bending force during rolling.
  • the resulting contour of the rolling stock and the resulting flatness of the rolling stock are important quality characteristics.
  • the influence of the contour and the flatness are - at least in the case of relatively thin rolling stock - inseparably linked.
  • the influence of the flatness and/or the contour can be achieved in various ways. and way.
  • the contour and/or the flatness of a six-high stand i.e. a rolling stand in which, in addition to the work rolls and the backup rolls, there are also intermediate rolls arranged between the work rolls and the backup rolls, usually referred to as a 6-high stand
  • the contour and/or the flatness can also be influenced by the opposite displacement of the intermediate rolls. This is particularly true for a so-called UCM (universal crown mill).
  • the object of the present invention is to provide possibilities by means of which the range within which high-quality rolling of a flat rolled product is possible can be increased.
  • an operating method of the type mentioned at the outset is designed in that the control device determines the intermediate roll setting value, the initial work roll control value and the initial intermediate roll control value in such a way that the initial work roll control value and/or the initial intermediate roll control value have a respective predetermined minimum distance from their minimum and maximum values.
  • the minimum distance can be determined as required. If the possible setting range, i.e. the range from the respective minimum value to the respective maximum value, is standardized to 100% and the respective minimum value is assigned the value 0%, the minimum distance can be, for example, 20%, 25%, 30%, 35% and even higher, for example 40% or 45% or even 50%. Of course, other values are also possible. It is even possible to to choose a different value for the minimum distance from the respective minimum value than for the minimum distance from the respective maximum value. For example, it can be specified that the initial work roll control value must be at least 30% away from its minimum value and at least 40% away from its maximum value. The sum of the two minimum distances can of course not exceed 100%.
  • the minimum distances for the initial work roll control value can be specified differently than for the initial intermediate roll control value. For example, it can be required that the initial work roll control value is at least 30% away from its minimum value and at least 40% away from its maximum value, while the initial intermediate roll control value is at least 20% away from its minimum value and at least 50% away from its maximum value.
  • the numerical values given are purely examples to explain the principle.
  • the minimum distances in such a way that at least one of the two initial control values is not in the middle between the limits of its respective setting range, but closer to its minimum or maximum value.
  • the intermediate rolls are usually designed the same and installed in the rolling stand inversely to one another.
  • the intermediate rolls also have a cone on one side within their running surface.
  • the control device determines the intermediate roll control value preferably as the signed distance of the cone from the side edge of the flat rolled stock. This procedure is particularly easy to implement.
  • the target values for the target contour and/or the target flatness can include, for example, a C2 value and a C4 value of a Chebyshev polynomial. Describing the target contour or the target flatness in this way is particularly simple. It is often completely sufficient if the target values only include these two values.
  • the operating method is preferably designed in such a way - that the control device implements a model by means of which the rolling of the flat rolling stock in the rolling stand is modelled based on mathematical-physical equations,
  • control device determines the intermediate roll setting value, the initial work roll control value and the initial intermediate roll control value by solving an optimization problem into which the model is incorporated.
  • the equations can be algebraic equations and differential equations.
  • the rolling stand also has a cooling device to influence the contour and/or flatness of the flat rolled stock, by means of which sections of the work rolls can be individually cooled across the barrel width of the work rolls.
  • the control device preferably also takes into account the individual cooling of the sections of the work rolls when determining the intermediate roll setting value, the initial work roll control value and the initial intermediate roll control value.
  • control program with the features of claim 6.
  • Advantageous embodiments of the control program are the subject of dependent claims 7 to 10.
  • the execution of the control program causes the control device to design an operating method of the type mentioned at the outset in that the control device determines the intermediate roll setting value, the initial work roll control value and the initial intermediate roll control value in such a way that the initial work roll control value and/or the initial intermediate roll control value have a respective predetermined minimum distance from their minimum and maximum values.
  • control program can also be designed in an advantageous manner.
  • the advantageous designs of the control program and the advantages achieved thereby correspond to those of the operating method according to the invention.
  • the object is further achieved by a control device with the features of claim 11.
  • the control device is programmed with a control program according to the invention, so that the control device operates the rolling stand according to an operating method according to the invention when executing the machine code of the control program.
  • the object is further achieved by a rolling stand for rolling a flat rolled metal product with the features of claim 12.
  • the control device of the rolling stand is designed as a control device according to the invention.
  • FIG 1 a rolling mill from the side
  • FIG 2 a rolling mill from above
  • FIG 3 a part of a rolling stand seen in the rolling direction
  • FIG 4 is a flow chart
  • FIG 5 a Chebyshev polynomial of degree 2
  • FIG 6 a Chebyshev polynomial of degree 4
  • FIG 7 Effectiveness of bending devices
  • FIG 8 another flow chart
  • FIG 9 a model.
  • a rolling stock 2 is to be rolled in a rolling stand 1.
  • the rolling stock 2 consists of metal, for example steel or aluminum.
  • the rolling stock 2 is a flat rolling stock, i.e. a strip (normal case) or a heavy plate (exception).
  • Rolling in the rolling stand 1 is usually cold rolling. In exceptional cases, however, it can also be hot rolling.
  • the rolling stand 1 has working rolls 3, which form a roll gap between them in which the rolling stock 2 is rolled.
  • FIGS 1 and 2 only the working rolls 3 of the rolling stand 1 are shown, i.e. in FIG 1 the upper and lower working rolls 3 and in FIG 2 only the upper working roll 3 (the lower working roll 3 is covered by the upper working roll 3).
  • FIG 3 shows the rolling stock 2 and the rolls 3 to 5 of the rolling stand 1 arranged above the rolling stock 2. Below the rolling stock 2 there is the same sequence of rolls 3 to 5, even if this is not shown in FIG 3 (or in FIG 1).
  • the rolling stand 1 has backup rolls 4 in addition to the work rolls 3, i.e. an upper and a lower backup roll 4.
  • the rolling stand 1 also has intermediate rolls 5.
  • the intermediate rolls 5 are arranged between the work rolls 3 and the backup rolls 4.
  • the upper intermediate roll 5 is arranged between the upper work roll 3 and the upper backup roll 4, so that above the rolling stock 2 there is a sequence of three rolls 3 to 5 arranged one above the other.
  • the lower intermediate roll 5 is arranged between the lower work roll 3 and the lower backup roll 4, so that below the rolling stock 2 there is also a sequence of three rolls 3 to 5 arranged one above the other.
  • the working rolls 3 and the backup rolls 4 are, as can be seen in FIG 3, generally symmetrical and identical to one another.
  • the intermediate rolls 5 are also generally identical to one another. However, they are often not symmetrical.
  • the intermediate rolls 5 can have a cone 7 on one side within their running surface 6.
  • Such a grinding of the intermediate rolls 5 is often referred to as a one-sided intermediate roll grinding.
  • the intermediate rolls 5 are generally installed inversely to one another in the rolling stand 1. If, as shown in FIG 3, the cone 7 of the upper intermediate roll 4 is located in the area of the right-hand side edge of the flat rolling stock 2 in FIG 3, the cone 7 of the lower intermediate roll 4 is therefore located in the area of the left-hand side edge of the flat rolling stock 2 in FIG 3.
  • the rolling stand 1 For the proper rolling of the flat rolling stock 2 in the rolling stand 1, in particular for adjusting the profile, contour and flatness, the rolling stand 1 according to FIG. 1 has various actuators 8 to 10, namely a sliding device 8, a work roll bending device 9 and an intermediate roll bending device 10.
  • profile is used as a purely scalar measure for the deviation of the thickness of the flat rolled stock 2 at a predetermined distance from the side edges of the flat rolled stock 2.
  • Cxx is common for the profile, where xx (in the unit “mm") stands for the predetermined distance from the side edges of the flat rolled stock 2.
  • contour is used for the progression of the thickness of the rolled stock 2 across the width of the rolled stock 2 minus the thickness of the rolled stock 2 in the middle of the rolled stock 2.
  • flatness in its literal sense, initially only includes visible distortions of the flat rolled stock 2. However, it is used as a synonym for the internal stresses prevailing in the flat rolled stock 2, regardless of whether these internal stresses lead to visible distortions of the flat rolled stock 2 or not.
  • An axial displacement of the intermediate rolls 5 can be set by means of the sliding device 8.
  • the axial displacement of the intermediate rolls 5 is generally in opposite directions to one another. If the upper intermediate roll 5 is therefore displaced to the left by a certain amount, the lower intermediate roll 5 is displaced to the right by the same amount.
  • the displacement of the intermediate rolls 5 is indicated in FIG. 3 by a double arrow within the upper intermediate roll 5.
  • the extent of the axial displacement is determined by an intermediate roll setting value UCA.
  • the intermediate roll setting value UCA can be determined in accordance with the illustration in FIG. 3 in particular as the signed distance of the cone 7 from the side edge of the flat rolling stock 2.
  • a bending force can be exerted on the work rolls 3 to bend the work rolls 3.
  • the bending of the work rolls 3 is indicated in FIG 3 by double arrows next to the upper work roll 3.
  • the associated work roll control value for the work roll bending device 9 is designated with the reference symbol B1.
  • a bending force can be exerted on the intermediate rolls 5 to bend the intermediate rolls 5 by means of the intermediate roll bending device 10.
  • the bending of the intermediate rolls 5 is indicated in FIG 3 by double arrows next to the upper intermediate roll 5.
  • the associated intermediate roll control value for the intermediate roll bending device 10 is designated with the reference symbol B2.
  • the rolling of the rolling stock 2 in the rolling stand 1 is controlled by a control device 11 of the rolling stand 1.
  • the control device 11 is usually software-programmable, as indicated within the control device 11 by the designation "pP" for "microprocessor".
  • the control device 11 is therefore programmed with a control program 12.
  • the control program 12 includes machine code 13 that can be processed by the control device 11.
  • the processing of the machine code 13 by the control device 11 causes the control device 11 to operate the rolling stand 1 according to an operating method that is explained in more detail below.
  • control device 11 first receives actual variables I and target variables Z in a step S1.
  • the actual values I describe the flat rolling stock 2 before rolling in the rolling stand 1.
  • the actual values I can, for example, be the geometric dimensions of the flat rolling stock 2. , in particular its width and its thickness.
  • the actual values I can also include other geometric parameters of the flat rolled stock 2, for example its profile, its contour and its flatness.
  • the actual values I can also include other properties of the flat rolled stock 2, for example its temperature, its chemical composition and possibly also its history.
  • the target variables Z can include variables that describe a target contour K* of the flat rolling stock 2 after rolling in the rolling stand 1.
  • the target variables Z for the target contour K* can include a C2 value k2 and a C4 value k4 of a Chebyshev polynomial, i.e. the coefficients for the Chebyshev functions of the 2nd and 4th degree.
  • a description of the target flatness is also possible.
  • the target flatness can, if necessary, be described analogously to the target contour K* by a corresponding C2 value and a corresponding 04 value.
  • Chebyshev polynomials and Chebyshev functions are well known to experts. Specifically, Chebyshev functions of the 2nd and 4th degree have the functional relationships
  • the value x 0 therefore stands for the center of the flat rolling stock 2, the values -1 and +1 for the left and right side edges of the flat rolling stock 2.
  • FIGS. 5 and 6 show the corresponding functions.
  • the C2 value k2 and the C4 value k4 are the coefficients with which the functions are included, for example, in the description of the target contour K*:
  • K* k2-C2 + k4-C4
  • the control device 11 determines the intermediate roll setting value UCA, an initial work roll control value B10 and an initial intermediate roll control value B20.
  • the determination is carried out taking into account the actual variables I. It is carried out in such a way that an expected contour KE of the flat rolling stock 2 is approximated as closely as possible to the target contour K* - as described by the target variables Z. Alternatively or additionally, the determination can also be carried out in such a way that an expected flatness of the flat rolling stock 2 is approximated as closely as possible to the target flatness described by the target variables Z.
  • step S2 is, as far as defined so far, not yet unambiguous. Therefore, several combinations of the intermediate roll setting value UCA, the initial work roll control value B10 and the initial intermediate roll control value B20 are possible, With each such combination, it is achieved that the expected contour KE and/or the expected flatness of the flat rolling stock 2 is approximated as closely as possible to the target contour K* and/or target flatness described by the target variables Z.
  • the control device 11 additionally takes into account the condition that the initial work roll control value B10 and/or the initial intermediate roll control value B20 have a respective predetermined minimum distance from their minimum values B1min, B2min and maximum values B1max, B2max when determining the above-mentioned values UCA, B10, B20. At least one of the two initial control values B10, B20 therefore meets the condition specified for it. In the simplest case, the determination is made such that the initial work roll control value B10 and/or the initial intermediate roll control value B20 are as far away as possible from their minimum values B1min, B2min and maximum values B1ax, B1max.
  • the control device 11 sets the axial displacement of the intermediate rolls 5 according to the determined intermediate roll setting value UCA.
  • the intermediate roll setting value UCA is thus specified to the shifting device 8.
  • the axial displacement of the intermediate rolls 5 is no longer changed during the rolling of the flat rolling stock 2 in the rolling stand 1.
  • the control device 11 sets the work roll control value B1 to the initial work roll control value B10 and the intermediate roll control value B2 to the initial intermediate roll control value B20.
  • step S1 to S4 are carried out by the control device 11 before the rolling of the flat rolling stock 2 in the rolling stand 1. From step S5 onwards, the rolling stock 2 is rolled in the rolling stand 1.
  • step S5 the rolling stand 1 is controlled during operation, i.e. while the rolling stock 2 is being rolled in the rolling stand 1.
  • the control device 11 controls, among other things, the two bending devices 9, 10 according to their respective control values B1, B2. It therefore sets the bending devices 9, 10 according to their respective control values B1, B2.
  • the control values B1, B2 have the initial control values B10, B20 at least at the start of the rolling of the flat rolling stock 2 in the rolling stand 1, so that the control device 11 sets the bending devices 9, 10 according to their respective initial control values B10, B20 at least at the start of the rolling of the flat rolling stock 2 in the rolling stand 1.
  • the initial control values B10, B20 are initially maintained until an actual value for the contour K can be recorded by means of a measuring device 14 arranged on the outlet side of the rolling stand 1.
  • the control device 11 therefore checks in a step S6 whether such an actual value is available to it. If and as long as this is not the case, the Control device 11 returns directly to step S5. In this case, the control device 11 in particular keeps the control of the bending devices 9, 10 unchanged according to their initial control values B10, B20. However, as soon as the control device 11 has an actual value for the contour K available, the control device 11 goes to step S7. In step S7, the control device 11 changes the control values B1, B2 with the aim of bringing the actual contour K given by the actual value closer to the target contour K*. The control device 11 then returns to step S5. The renewed control of the bending devices 9, 10 when step S5 is carried out again now takes place with the correspondingly changed control values B1, B2.
  • steps S5, S6 and S7 is continued until the flat rolling stock 2 has been completely rolled in the rolling stand 1.
  • the condition is taken into account that the initial work roll control value B10 and/or the initial intermediate roll control value B20 have a respective predetermined minimum distance from their minimum values B1min, B2min and maximum values B1max, B2max.
  • FIG 7 shows for several intermediate roll setting values UCA which C2 values k2 and C4 values k4 can be set by setting the work roll control value B1 and the intermediate roll control value B2.
  • each intermediate roll setting value UCA there is (exactly or at least approximately) a trapezoid 15 in the k2-k4 space.
  • the trapezoids 15 are each supplemented in FIG 7 by a small letter (a to e).
  • the addition of the respective small letter serves only to linguistically distinguish the trapezoids 15 from one another.
  • the small letters are only used below when a very specific reference is to be made to a very specific trapezoid 15. If the trapezoids 15 are referred to in general, the small letter is omitted.
  • the procedure is completely analogous with regard to the respective intermediate roll setting value UCA.
  • the edges of the trapezoids 15 correspond to the fact that one of the two control values
  • the target contour K* corresponds to a point 16 in the k2-k4 space
  • the target contour K* can indeed be set with the intermediate roll setting value UCAc.
  • the target contour K* can also be set with the intermediate roll setting value UCAe.
  • only a small control reserve is available for both an increase in the intermediate roll control value B2 and for a reduction in the C2 value k2 and for an increase in the C4 value k4.
  • the intermediate roll setting value UCAd is selected, not only the target contour K* can be set. Rather, a large control reserve is available for both a reduction and an increase in the intermediate roll control value B2 (and also the work roll control value B1). Correspondingly, a large control reserve is also available for both a reduction and an increase in the C2 value k2 and also for both a reduction and an increase in the C4 value k4.
  • the initial work roll control value B10 and/or the initial intermediate roll control value B20 in such a way that at least one of the two values B10, B20 is as far away as possible from its minimum value B1min, B2min and maximum value B1max, B2max.
  • a deviation from this rule can be justified by the fact that a later heating of the work rolls 3 occurs during the rolling of the rolling stock 2 in the rolling stand 1 and, correspondingly, a change in the contour of the work rolls 3 occurs.
  • a concrete determination of the intermediate roll setting value UCA can be made, for example, in such a way that a symmetrical convex geometric figure is defined in the k2-k4 space.
  • a suitable symmetrical convex geometric figure is, for example, a rectangle (special case: square), the edges of which are oriented parallel to the k2 or k4 axis and have a predetermined relationship to one another.
  • Another suitable symmetrical convex geometric figure is, for example, an ellipse (special case: circle), the main axes of which are oriented parallel to the k2 or k4 axis and have a predetermined relationship to one another.
  • the intermediate roll setting value UCA sought is clearly determined by the condition that when the symmetrical convex geometric figure is centered Figure relative to point 16, the area covered by the symmetrical convex geometric figure is maximized.
  • An exception only arises in the very unlikely case that the target contour K* is specified so unfavorably that it can "only just be achieved". An example of such a case would be if the target contour K* in the k2-k4 space could be described by point 16'. If the initial work roll control value B10 and/or the initial intermediate roll control value B20 are not to be in the middle between their minimum values B1min, B2min and maximum values B1max, B2max, this procedure can be modified by using distorted figures.
  • FIG 8 shows a schematic of a possible procedure for determining the intermediate roll setting value UCA.
  • FIG 8 corresponds to the result of an implementation of step S2 of FIG 4.
  • the control device 11 first determines an average value B1 M for the work roll control value B1 in a step S11.
  • the control device 11 forms the unweighted arithmetic mean of the minimum and maximum work roll control values B1min, B1 max in step S11.
  • the control device 11 determines an average value B2M for the intermediate roll control value B2 in a step S12.
  • control device 11 sets the intermediate roll setting value UCA to an initial value.
  • control device 11 determines the associated initial control values B10, B20 for which the expected contour KE corresponds as closely as possible to the target contour K* (alternatively or additionally: the expected flatness corresponds as closely as possible to the target flatness).
  • a step S15 the control device 11 checks whether the determined initial work roll control value B10 corresponds exactly or at least approximately to the associated average value B1M. If this is the case, the control device 11 proceeds to a step S16. If this is not the case, the control device 11 checks in a step S17 whether the determined initial intermediate roll control value B20 corresponds exactly or at least approximately to the associated average value B2M. If this is the case, the control device 11 also proceeds to step S16. If this is not the case, the control device 11 varies the intermediate roll setting value UCA in a step S18 and from there returns to step S14.
  • step S16 the control device 11 checks whether the variation of the intermediate roll setting value UCA should be terminated.
  • the check in step S16 can, for example, consist of an evaluation of the symmetrical convex geometric figure explained above. If the variation of the intermediate roll setting value UCA is not to be terminated, the control device 11 proceeds to step S18. Otherwise, the procedure of FIG. 8 is completed.
  • the last determined values UCA, B10, B20 are then used in steps S3 and S4 of FIG. 4.
  • the control device 11 can implement a model 17 as shown in FIG. 9.
  • the rolling of the flat rolling stock 2 in the rolling stand 1 is modeled using the model 17.
  • the model 17 is based on mathematical-physical equations. In particular, it can comprise differential equation systems that are locally resolved in two or three dimensions and coupled to one another.
  • the actual variables I and the target variables Z are included in the mathematical-physical equations.
  • the intermediate roll setting value UCA, the initial work roll control value B10 and the initial intermediate roll control value B20 are also included in the mathematical-physical equations.
  • the model 17 supplies the expected contour KE (alternatively or additionally the expected flatness) as an output variable.
  • a corresponding model 17 as such is known to those skilled in the art.
  • control device 11 can, for example, determine the intermediate roll setting value UCA, the initial work roll control value B10 and the initial intermediate roll control value B20 in the context of step S2 or step S14 by solving an optimization problem in which the model 17 is included.
  • the actuators 8 to 10 mentioned i.e. the sliding device 8, the work roll bending device 9 and the intermediate roll bending device 10, are the only actuators by means of which the contour K and/or the flatness of the flat rolling stock 2 can be influenced.
  • the rolling stand 1 additionally has a cooling device 18 for influencing the contour K and/or the flatness of the flat rolling stock 2 as shown in FIG. 2.
  • sections of the work rolls 3 can be individually cooled by means of the cooling device 18 across the barrel width of the work rolls 3.
  • the control device 11 also takes into account an individual cooling B3 of the sections of the work rolls 3 when determining the intermediate roll setting value UCA, the initial work roll control value B10 and the initial intermediate roll control value B20.
  • the individual cooling B3 of the sections of the work rolls 3 can be taken into account by the control device 11 as part of the execution of steps S2 or S14 of FIGS. 4 or 8, or the individual cooling B3 of the sections of the work rolls 3 can be an additional input variable of the model 17 and taken into account accordingly in the model 17.
  • the present invention has many advantages.
  • the influence of the specific intermediate roll setting value UCA has essentially no influence on the setting range of the two Bending devices 9, 10. However, it has a significant influence on the resulting effect of the associated control values B1, B2 on the roll gap and thus on the contour K and the flatness of the rolled rolling stock 2.
  • the procedure according to the invention in the rolling stand 1 allows a very wide range of different flat rolling stock 2 to be rolled properly. This applies both to the strength of the flat rolling stock 2 and to its dimensions as well as to the requirements for profile, contour K and flatness.
  • a costly and time-intensive exchange of the work rolls 3 for other work rolls 3 with an adapted crown is not necessary in many cases.
  • the individual cooling B3 of the work rolls 3 can be used. However, this is usually not necessary. This is an advantage in particular because the individual cooling B3 of the work rolls 3 is very slow on the one hand and only has a small adjustment range on the other.

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

Abstract

L'invention concerne un procédé de détermination de grandeurs manipulées d'une cage de laminage, ainsi qu'une cage de laminage (1) destinée au laminage d'un matériau à laminer métallique plat (2), ladite cage de laminage comprenant des cylindres de travail (3), des cylindres d'appui et des cylindres intermédiaires. Un dispositif de commande (11) pour la cage de laminage (1) reçoit des grandeurs réelles (I) et des grandeurs cibles (Z). Les grandeurs réelles (I) décrivent le matériau à laminer plat (2) avant d'être laminé dans la cage de laminage (1), et les grandeurs cibles (Z) décrivent un contour cible et/ou une planéité cible du matériau à laminer plat (2) après avoir été laminé dans la cage de laminage (1). Avant que le matériau à laminer plat (2) ne soit laminé, et en tenant compte des grandeurs réelles (I), le dispositif de commande (11) détermine une valeur de réglage de cylindre intermédiaire pour un déplacement axial des cylindres intermédiaires et des valeurs de commande initiales pour un dispositif de cintrage (9, 10) pour cintrer les cylindres de travail (3) et les cylindres intermédiaires, pour lesquels un contour attendu et/ou une planéité attendue du matériau à laminer plat (2) sont rapprochés le plus possible du contour cible et/ou de la planéité cible décrite par les grandeurs cibles (Z). Le dispositif de commande (11) règle le déplacement axial des cylindres intermédiaires en fonction de la valeur de réglage de cylindre intermédiaire (UCΔ) déterminée avant le laminage du matériau à laminer plat (2) dans la cage de laminage (1) et, au moins lorsque le laminage du matériau à laminer plat (2) commence, règle les dispositifs de cintrage (9, 10) en fonction des valeurs de commande initiales déterminées. Le dispositif de commande (11) détermine la valeur de réglage de cylindre intermédiaire (UCΔ) et les valeurs de commande initiales de telle sorte que la valeur de commande de cylindre de travail initiale et/ou la valeur de commande de cylindre intermédiaire initiale aient une différence minimale prédéfinie par rapport à leurs valeurs minimale et maximale.
PCT/EP2023/077316 2022-10-11 2023-10-03 Procédé de détermination de grandeurs manipulées d'une cage de laminage, programme de commande correspondant, dispositif de commande comprenant un tel programme de commande, et cage de laminage comprenant un tel dispositif de commande WO2024078918A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP22200877.3A EP4353375A1 (fr) 2022-10-11 2022-10-11 Procédé de détermination de variables de réglage d'une cage de laminoir, programme de commande correspondant, dispositif de commande muni d'un tel programme de commande et cage de laminoir muni d'un tel dispositif de commande
EP22200877.3 2022-10-11

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WO2024078918A1 true WO2024078918A1 (fr) 2024-04-18

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EP (1) EP4353375A1 (fr)
WO (1) WO2024078918A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0094104A2 (fr) * 1979-10-04 1983-11-16 Hitachi, Ltd. Laminoir et méthode pour laminer des tôles
JPS6046804A (ja) 1983-08-24 1985-03-13 Hitachi Ltd 圧延機の形状制御方法
JPS62158512A (ja) * 1986-01-07 1987-07-14 Nippon Steel Corp 板圧延における形状制御方法
EP1481742A2 (fr) * 2003-05-30 2004-12-01 Siemens Aktiengesellschaft Ordinateur de commande et procédé de détermination assistée par ordinateur pour le control de la planéité et du profile pour une cage de laminoir
EP3536411A1 (fr) * 2018-03-09 2019-09-11 Primetals Technologies Germany GmbH Prévention des bords d'usure lors du laminage d'un produit plat à laminer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0094104A2 (fr) * 1979-10-04 1983-11-16 Hitachi, Ltd. Laminoir et méthode pour laminer des tôles
JPS6046804A (ja) 1983-08-24 1985-03-13 Hitachi Ltd 圧延機の形状制御方法
JPS62158512A (ja) * 1986-01-07 1987-07-14 Nippon Steel Corp 板圧延における形状制御方法
EP1481742A2 (fr) * 2003-05-30 2004-12-01 Siemens Aktiengesellschaft Ordinateur de commande et procédé de détermination assistée par ordinateur pour le control de la planéité et du profile pour une cage de laminoir
EP3536411A1 (fr) * 2018-03-09 2019-09-11 Primetals Technologies Germany GmbH Prévention des bords d'usure lors du laminage d'un produit plat à laminer

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
EYRING H ET AL: "NEUBAU EINES ZWEIGERUESTIGEN NACHWALZWERKES FUER DAS DRESSIEREN UND REDUZIEREN VON FEINSTBLECH", STAHL UND EISEN,, vol. 112, no. 4, 15 April 1992 (1992-04-15), pages 73 - 81, 154, XP000274132, ISSN: 0340-4803 *
QING-LONG WANG ET AL.: "Numerical Analysis of Intermediate Roll Shifting-Induced Rigidity Characteristics of UCM Cold Rolling Mill", STEEL RESEARCH INTERNATIONAL, no. 1700454, 2018
QING-LONG WANG ET AL.: "Numerical and experimental analysis of strip cross-directional control and flatness prediction for UCM Cold Rolling Mill", JOURNAL OF MANUFACTURING PROCESSES, vol. 34, 2018, pages 637 - 649, XP085431748, DOI: 10.1016/j.jmapro.2018.07.008

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