EP3271092B1 - Method for producing metal strips - Google Patents
Method for producing metal strips Download PDFInfo
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- EP3271092B1 EP3271092B1 EP16709931.6A EP16709931A EP3271092B1 EP 3271092 B1 EP3271092 B1 EP 3271092B1 EP 16709931 A EP16709931 A EP 16709931A EP 3271092 B1 EP3271092 B1 EP 3271092B1
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- metal strip
- profile
- adaptation
- contour
- values
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- 239000002184 metal Substances 0.000 title claims description 173
- 238000004519 manufacturing process Methods 0.000 title claims description 16
- 230000006978 adaptation Effects 0.000 claims description 162
- 238000000034 method Methods 0.000 claims description 52
- 238000005096 rolling process Methods 0.000 claims description 41
- 238000004364 calculation method Methods 0.000 claims description 27
- 239000011324 bead Substances 0.000 claims description 26
- 230000008569 process Effects 0.000 claims description 20
- 238000004393 prognosis Methods 0.000 claims description 20
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- 238000009434 installation Methods 0.000 claims 7
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- 238000013459 approach Methods 0.000 description 7
- 238000013213 extrapolation Methods 0.000 description 4
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Images
Classifications
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- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2263/00—Shape of product
- B21B2263/02—Profile, e.g. of plate, hot strip, sections
Definitions
- the invention relates to a method for producing metal strips in a rolling mill with a desired profile contour according to the preamble of patent claim 1 or 3.
- Background of the present invention is the fact that the requirements for the setting accuracy of a profile of a metal strip increase at least at individual predetermined bandwidth positions, so-called reference positions, as well as the dimensional accuracy of the profile contour of the metal strip.
- box sections may be required, d.
- H. Metal bands with a flat cross-section in the middle, which decreases more towards the band edges; This requirement is made for example on metal bands, which are to be divided later in the longitudinal direction.
- concave band profiles i. H. Band profiles, which have thicker or raised edges compared to their middle region, and metal bands with Kantenwulsten usually not desired.
- the international patent application discloses WO 1995/034388 a detection system for detecting the profile of a metal strip at the exit of a finishing train.
- the band profile K detected there is compared with a predetermined target profile at this position, and the use of profile actuators is proposed in order to minimize the deviation of the measured profile from the target profile in subsequent bands.
- the EP 0 618 020 B1 aims to adapt the profile of a metal strip at the exit of a hot strip mill to a predetermined target contour.
- mechanical actuators are used so that a possibly determined deviation between a calculated, ie predicted band shape and the predetermined target contour is minimized.
- a measured band profile C40 (at the position 40 mm from the band edge) is used for correction or adjustment of control systems.
- a prediction value for the band profile and setting values for profile actuators when rolling an nth metal band at a predetermined reference position are simulated and calculated with the aid of a mathematical-physical process model. If necessary, the simulation takes into account restrictions and the use of different profile actuators.
- an adaptation value is calculated on the basis of the difference between said prediction value and a measured actual value for the strip profile of the nth metal strip at said reference position.
- the reference position is a predetermined bandwidth position measured from the natural edge of the metal strip, for example 25 or 40 mm.
- said prediction value and the said adaptation value are determined or predefined only at a single reference position in order to define individual target values for the band profile of the metal band on this basis.
- the invention has the object, a known method for producing metal strips in one To further develop rolling plant to the effect that - in the future production of metal strips - a more accurate forecast of the profile contour of the metal strip across the width and a more accurate adjustment of profile actuators of the rolling mill is possible.
- the prognosis value for the profile contour is calculated in the context of the simulation of the rolling process before the rolling of the metal strip.
- the prediction value according to the method of claim 3 is not calculated in the simulation before rolling, but by a recalculation after the rolling of the metal strip.
- the aim in both methods is that the calculated forecast values coincide with the predetermined target values; However, due to process- or analgen-specific peculiarities, it may happen that the forecast values do not exactly match, but only approximately with the target values.
- metal strip also includes metal sheet.
- roller mill includes both single scaffolding, such as heavy plate scaffolding, Steckel or Twin Steckel scaffolding, etc., but also whole finishing mills with a.
- reference position bi preferably designates a subjacent of the general positions m in the width direction of the metal strip. While normal bandwidth positions are defined by their respective distance from the center of the metal strip in the width direction, reference positions are defined by a respective predetermined distance from the belt edge or natural edge of the metal strip. For standardized reference positions, eg. B. 25 mm, 40 mm or another reference position, z. B. 100 mm from the natural edge of the metal strip are typically given values for the profile contour, z. As C25, C40 or C100 values. The reference positions are preferably the same for different bandwidths or for all metal bands. Whether the C ... values are target values, forecast values or adaptation values is determined from the context.
- process model means a mathematical / physical model for simulating a rolling process. In particular, it is suitable to calculate prognosis values and profile contours for the metal strip as well as the setting values of profile actuators.
- the process model is also referred to as "Profile Contour and Flatness Control” PCFC.
- later production or “future production” means a manufacturing or rolling time after the determination of the new adaptation value for the at least n'te metal strip. Later manufacturing can be further Obtain longitudinal sections of the same nth metal strip or a completely new metal strip n + x.
- n + 2 denotes the second metal strip to be produced after the nth metal strip, in particular to be rolled.
- the respective future to be rolled band is thus generally designated for the corresponding preset calculation each n + x.
- the previously calculated adaptation values are used here.
- profile contour and “band profile”, each seen in the width direction of the metal strip, are used synonymously.
- the core idea of the claimed claimed invention is that an adaptation value as the difference between a measured actual value and a calculated, ie predicted value for the profile contour of the metal strip not only, as usual in the prior art, at only one (number) determined Reference position, but at a plurality of reference positions is determined.
- This advantageously a Bandkonturadaption is possible.
- This plurality of determined adaptation values over the bandwidth can be taken into account in the calculation and adjustment of the profile actuators and in the calculation of the profile contour or in the calculation of the prognosis values for the metal strips to be rolled in the future.
- the profile actuators can advantageously be more accurate with regard to the desired target values for a long longitudinal section of the nth metal strip or for the profile contour of the n + x'ten metal strip or the profile contour in the future to be rolled metal bands. Also the calculation of Forecast values for the profile contour is therefore more accurate for the n + x'th metal strip, ie for metal strips to be rolled in the future.
- the short term adaptation value is then calculated as the sum of the initial value and the difference between the actual value C actual (n) bi for the profile contour and the prediction value C P (n) bi of the nth metal band at the reference position bi.
- the long-term adaptation value ⁇ C L bi is optionally taken from the corresponding adaptation group to which the metal band n + x belongs.
- the long-term adaptation value may also result from an averaging of the total adaptation values (long-term and short-term adaptation value) of j bands that have been rolled in the same adaptation group in the past.
- the maximum number used in the past rolled bands j can e.g. 100 or 50 and is freely definable.
- the difference in a band thus affects the long-term adaptation value only for a jth part.
- the determined long-term adaptation value can be used in the PCFC preset calculation to 100% or only partially, depending on freely definable boundary conditions.
- the definition and the calculation of the long-term adaptation value ⁇ C L (n) bi may presuppose the knowledge of the short-term adaptation value ⁇ C K (n) bi.
- the Kurzzeitadaptionswert can also be used alone.
- the long-term and / or short-term adaptation value it is also possible to determine a total adaptation value for determining the setting values of the profile actuators and for determining the contour of the band at the reference points bi according to claim 6. This total adaptation value is then calculated as the sum of the short-term adaptation value and the long-term adaptation value in each case at a reference position bi.
- the determined short-term adaptation value, the determined long-term adaptation value or the determined sum adaptation value can be used in the calculation for presetting the profile actuators either to 100% or only to a desired part.
- the desired proportion can be selected depending on freely definable boundary conditions.
- z. B. 33 or 50% the adaptation effect is attenuated or smoothed.
- the change of short-term adaptation values from band to band may be limited by a maximum value, e.g. B. 10 microns, are limited to not weight any individual measurement errors too high.
- the short term adaptation value may be furnace dependent or dependent on other process variables.
- the Kurzzeitadaptionswert usually refers to the profile differences of the last band n. In exceptional cases, z. B. the Profile difference be related to the penultimate band. Then n corresponds to the band n-1 or generally nx.
- the adaptation values calculated according to the invention at the individual width positions bi of the metal strip can advantageously also be used to determine the adaptation contour of the metal strip by connecting the individual existing adaptation values with one another to at least one suitable attachment function.
- the adaptation contour can be guided by the adaptation values ⁇ C ( n + x ) bi determined for the metal band n + x, or the adaptation contour runs close to the adaptation values depending on the approach function or smoothing function (approximation).
- An approach function is thus used to connect adaptation values, interpolation, smoothing, extrapolation or approximation and is for example so designated.
- adaptation values are present at at least two reference positions bi, and preferably at least one further adaptation contour value is present at a further bandwidth position m, which is not a reference position.
- bandwidth positions are typically dictated by the process model.
- the adaptation contour can be determined either only over a limited section or area or over the entire width of the metal strip.
- the density of the known adaptation values may be different in individual regions over the width of the metal strip.
- the adaptation contour can also be determined without further determination by an interpolation function; In this case, the adaptation contour simply exists in the adjacent sequence the plurality of adaptation values.
- the maximum number I of bandwidth positions, in particular reference positions is less than 10.
- the said and determined adaptation contour for the n + x'th metal band is added to a non-adapted calculated profile contour predicted by the process model in order to obtain an adapted profile contour for the n + x'th metal band.
- a first width section may be, for example, in the middle width area and second width section or further width sections may be, for example, in the edge area, also called edge area of the metal strip.
- the attachment functions or the adaptation contour or the adapted profile contour over the two width sections are preferably selected such that the contour progressions are continuously differentiable at the border from one band section to another, in particular have the same pitch. This condition avoids that the contours at the boundary between the two band sections have a kink; instead, they go smoothly together.
- the adaptation contour or the adapted profile contour over a width section of the metal strip can be extrapolated into an adjacent width section for determining an extrapolated adapted adaptation contour or an extrapolated adapted profile contour over the adjacent width region, in particular if no adaptation values or measured profile contour values are known there.
- the said at least one starting function or approximation function or interpolation function for connecting individual adaptation or profile contour values or the said extrapolation function can be formed from a linear function, a polynomial function of any order, an exponential function, a trigonometric function, a spline function or a combination of different functions.
- the starting functions or interpolation functions can also be different for different width sections of the metal strip.
- the imaginary plane also called the width plane, acts as a mirror plane at half the width or width of the metal strip, which extends in the longitudinal direction of the metal strip.
- the adapted profile contour values or the adapted profile contour can initially only for a band half, z. B. the band half can be determined on the operating side and below for the other band half, z. B. mirrored for the band half on the drive side.
- the measured actual value of the profile contour can be used as a direct measured value at the reference position bi or as a profile measured value smoothed by a compensation function across the width, for example a measured value interpolation function.
- the measured actual values C ist (n) bi in the profile contour can be determined at a defined tape length position or averaged over a tape segment length or averaged over an entire tape length.
- the adapted profile contour determined according to the invention is determined with regard to profile anomalies, such as, for example, band bulges, d. H. unwanted thickening in the band edge region, or steep band profile waste, especially in the edge region of the metal strip analyzed.
- profile anomalies such as, for example, band bulges, d. H. unwanted thickening in the band edge region, or steep band profile waste, especially in the edge region of the metal strip analyzed.
- the analysis is preferably carried out online or in a real-time mode.
- the profile actuators can be suitably adjusted to actively combat or reduce said profile anomalies in subsequently rolled sections in the longitudinal direction of the same metal strip or subsequently rolled metal strips.
- the band profile level 40 mm away from the natural edge of the metal strip automatically by the process model within allowable predetermined profile level limits between, for example, C40 target min and C40 target max set to a value, usually raised, so that the maximum allowable bead height is not exceeded or reduced or / and there is a targeted use of profile actuators (eg roller displacement, etc.) to reduce the bead height.
- C40 target min and C40 target max set to a value, usually raised, so that the maximum allowable bead height is not exceeded or reduced or / and there is a targeted use of profile actuators (eg roller displacement, etc.) to reduce the bead height.
- the body band profile ie the profile contour in the middle region of the metal band
- the edge band profile using the contour adaptation can be adjusted more precisely in two steps.
- the profile actuators for the rear scaffolds or last stitches are set so that the nominal profile is also set at the edge of the strip or so that an overall contour is shaped.
- target profile values for different width positions can be specified, all of which are set or / and which are kept or monitored within certain limits.
- a target profile value C25 30 ⁇ m can be set in the edge region or the deviation can be minimized and at the same time the limit C100> 15 ⁇ m can be maintained for a target profile value in the bodyband region.
- the profile value in the band edge region may be e.g. C25 or alternatively the bodyband profile value e.g. C100 as the primary target variable and given differently from band to band.
- the band contour values or the band contours are adapted (as described) at these reference points.
- the adapted profile contour function consisting of m max profile contour values C (n + x) m, is advantageously analyzed with respect to band profile anomalies, and by means of the process model the information of the analyzed finished band contour errors is transmitted to the calculation of the interstitial or intermediate stitch contours by means of transfer functions or weighting factors not described in detail.
- the determined adaptation values at the positions bi are transmitted to the calculation of the interstand or intersection contours by means of transfer functions or weighting factors not described in greater detail.
- band contour anomalies bead height, bead width, edge drop between two defined profile points (eg C25-C100) as well as profile deviations in the middle band range (or at C100, C125, C150 or C200) thus allow a targeted analysis of whether band contour errors occur at the edge, in the middle range or in both ranges.
- profile actuators of the different frameworks are iteratively used in a more targeted manner in order to avoid or reduce band profile anomalies.
- profile actuators e.g. variable work roll cooling systems, zone cooling or local roll heating for influencing the thermal crown, a work roll displacement in conjunction with roll grinding ("anti-bead roller” or “tapered roll”, CVC roller coiling) Rollers, higher order polynomial or trigonometric functions), band edge heaters, band zone cooling, work roll bends, and / or scaffolds with pair-cross function.
- roll grinding anti-bead roller” or “tapered roll”, CVC roller coiling
- band edge heaters band zone cooling
- work roll bends e.g. variable work roll cooling systems, zone cooling or local roll heating for influencing the thermal crown
- band edge heaters e.g. variable work roll cooling systems, zone cooling or local roll heating for influencing the thermal crown
- work roll bends e.g. variable work roll cooling systems, zone cooling or
- FIG. 1 shows a cross section, ie the profile contour of a metal strip registered in a coordinate system, wherein the abscissa the band width position m and bi and the ordinate a profile value for the profile contour is applied.
- the coordinate system is designed to the curved profile contour so that it is placed in the middle of the width of the curved profile contour.
- Positive values for the bandwidth position extend in FIG. 1 to the right and negative values for the bandwidth position extend in FIG. 1 to the left, respectively in the width direction of the metal band.
- the profile values are accordingly ablated perpendicularly from the abscissa and indicated with positive signs.
- the profile values describe, in particular, the curvature of the metal strip at a specific bandwidth position in relation to the center of the metal strip.
- FIG. 1 are initially two profile contours to recognize, namely on the one hand a measured profile contour, in FIG. 1 shown as a dashed line. In addition, as a solid line z.
- B Predictive profile contour without adaptation, which was calculated using a process model.
- the predicted profile contour, as in FIG. 1 is not yet adapted in the context of the invention, as will be described below.
- the predicted profile contour corresponds to a juxtaposition of calculated profile contour values or the profile contour or prognosis values connected to one another via an approach or interpolation function.
- Essential for the adaptation according to the invention is the determination of a corresponding adaptation value ⁇ C (n) bi, which determines the profile deviation, ie the difference between the actual value C actual (n) bi and the associated prognostic value C P (n) bi at the plurality of bandwidth positions b1 to b4 describes.
- the bandwidth positions bi are arbitrary positions in the width direction of the metal strip; Usually, latitude positions are defined by their positive or negative distance from the mid-band. In some standardized cases, however, these bandwidth positions can advantageously also be defined by their distance from the respective natural edge of the metal strip on the drive side or / and on the operating side of the metal strip, then respectively in the direction of the strip center.
- the bandwidth positions thus defined are typically referred to as reference positions. These normalized reference positions are then typically associated with specific profile values, which are then referred to as C40 or C100, for example become. The figure behind the C then corresponds to the distance of the bandwidth position of the respective natural edge of the metal strip.
- FIG. 1 the profile contour is shown over the entire width of the metal strip from the drive side to the operating side.
- Figures 2 and 5 For reasons of simplification, only the right half of the profile contour of the metal strip is shown in each case. In this half determined adaptation values or differences between predicted and measured profile contour can be assumed at least approximately by mirroring for the left half of the profile contour.
- a smoothing function is preferably applied by the entire measured band contour in order to suppress any noise of the band contour signals.
- the calculation of the profile contour and the corresponding adaptation according to the invention can be symmetrical only for one band half or asymmetrically over the entire width.
- FIG. 2 illustrates the inventive method for producing a metal strip or in particular for adapting the profile contour of the metal strip.
- Figure 2.1 first describes the determination according to the invention of the adaptation values on an n-th metal band, shown in simplified form only for the right-hand band half and on the example of only two adaptation points.
- Figure 2.1 can on the previous description of the FIG. 1 to get expelled; this applies to the Figure 2.1 alike.
- the bandwidth positions or the points in the width direction where a calculation of a profile value takes place are generally numbered consecutively with the parameter m, in particular if they are counted from the center of the band CL.
- the reference positions bi are equally bandwidth positions, which are not defined by the band center but by their distance from the natural edge of the metal band.
- the parameter m is also used as an indication of the entire contour or total number of contour calculation points in contrast to the parameter bi, which is to be understood regularly only as an indication of discrete values (reference positions).
- Fig. 2.2 illustrates the determination of an adaptation contour according to the invention.
- the adaptation contour is determined for the following band n + x. On the band n can z. For example, the width may be different than for band n + x. Only the adaptation values bi at the band n or / and long-term daptation are used Averaging is determined for a number of bands j and used for a following band n + x.
- the adaptation contour and the point sequence ⁇ C (n + x) m (with the index m) is always used only in connection with the band n + x.
- the adaptation contour can be determined by extrapolation.
- the interpolation or extrapolation is used to interpolate or extrapolate on the profile values at other bandwidth positions m based on the given profile values at the reference positions.
- Figure 2.3 illustrates how the previously according to Figure 2.2 For the n + 1'te metal strip determined adaptation contour can now be considered in the forecast and subsequent production to be rolled n + 1'ten metal strip.
- Figure 2.3 shows, inter alia, the calculated adapted profile contour C p (n + 1) m and the calculated adapted predicted values C P (n + 1) b1 and C P (n + 1) b2 and a related calculated predicted profile contour C P (n + 1) m OA , with oA: without adaptation, here by way of example for the n + 1'th metal strip, ie here as an example for the next metal strip to be rolled.
- Adaptation values ⁇ C (n) b1 and ⁇ C (n) b2 determined for the nth metal band can be added to the prediction values at the corresponding reference positions in order to obtain improved adaptive prognosis values for the predicted adapted profile values or profile contour there.
- the new adapted prognosis values or the new profile contour obtained in this way can advantageously be used to set the profile actuators even more precisely with respect to desired target values and / or target contours in the production of the n + 1'th, in general the n + x'ten metal band to be able to.
- the width position m may also be reference positions bi.
- the difference or adaptation .DELTA.C (n) m between measured and calculated correction is at the in Figure 2.2 shown example for ease of description / illustration shown only for a metal band.
- this difference is formed on the last rolled metal strip and / or on the penultimate rolled metal strip and / or on a plurality of metal strips of the same type, optionally with different weighting, and in this way a sum adaptation value is determined.
- FIG. 3 shows an application example for the use of the contour adaptation according to the invention for reducing or avoiding unwanted beads in the edge region of a metal strip.
- contour adaptation Without the use of contour adaptation, it may happen that bands with supposedly normal profile contours are calculated or predicted; see the dashed output contour after the first calculation step without contour adaptation in FIG. 3 .
- FIG. 3 shown adapted profile contour C P (n + x) m are determined for the n + x'te metal strip.
- the advantage of the profile contour C P (n + x) m adapted according to the invention over the non-adapted predicted profile contour C P (n + x) m OA is in FIG.
- the profile adaptation according to the invention provides an improved calculation result for determining a more accurate profile contour and opens up new possibilities for improving the profile contour, here in particular for reducing the bead height. For example, for the metal strip according to FIG. 3 calculates an edge bead height W1, which is higher than a threshold value for an allowable bead height, then the process model within given allowable limits z. B.
- C40 target min and C40 target max the profile value at the corresponding edge position, here 40 mm from the natural edge of the metal strip away, automatically set to a new value, raised here, so that the maximum allowable bead height is not exceeded or reduced.
- a raised force level within the limits of the process and equipment limits in the rear stands of a finishing train or in a reversing stand in the later back stitches can be used. This can be achieved by a rolling force redistribution, ie a relief of the front scaffolds or earlier stitches and a greater load on the rear scaffolding or later stitches and / or by driving up one or more scaffolds (last scaffold or last stitch or scaffolding within the finishing train or middle stitch) happen.
- Figure 4.1 shows examples of advantageous Walktkraftumveranderen to the bead height W1 (see Figure 4.2 ) to reduce.
- the knowledge of the expected profile contour due to the physical modeling of the relationships and the said adapted profile contour a plurality of width positions bi across the width of the metal strip is further actively utilized to assist in setting a nominal strip profile at the strip edge, e.g. B. at position C25, in addition, the band profile in the band center area - expressed by CBody or C100 - in allowable minimum and maximum limits C100 min , C100 max to hold, as is an example in FIG. 5 is shown.
- additional process limits are introduced and the minimum and maximum band profile limits for multiple band contour points, eg. C25 and C100.
- the improved result (2nd calculation section) represents the band contour with the solid line.
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Description
Die Erfindung betrifft ein Verfahren zum Herstellen von Metallbändern in einer Walzanlage mit einer gewünschten Profilkontur gemäß dem Oberbegriff des Patentanspruchs 1 oder 3.The invention relates to a method for producing metal strips in a rolling mill with a desired profile contour according to the preamble of
Hintergrund der vorliegenden Erfindung ist die Tatsache, dass die Anforderungen an die Setzgenauigkeit eines Profils eines Metallbandes zumindest an einzelnen vorgegebenen Bandbreitenpositionen, sogenannten Referenzpositionen, sowie auch an die Maßhaltigkeit der Profilkontur des Metallbandes steigen. Je nach geplantem Einsatzgebiet eines Metallbandes werden z. B. parabelförmige Warmbandprofilkonturen mit einer vorbestimmten Profilhöhe an einer bestimmten Referenzposition erwartet, um die Weiterverarbeitung in einem nachgeschalteten Kaltwalzwerk (Tandemstraße) zu vereinfachen. Alternativ können auch Kastenprofile gefordert sein, d. h. Metallbänder mit einem in der Mitte flachen Querschnitt, welcher zu den Bandkanten hin stärker abfällt; diese Forderung wird beispielsweise an Metallbänder gestellt, welche später in Längsrichtung geteilt werden sollen. Dagegen werden konkave Bandprofile, d. h. Bandprofile, welche dickere bzw. erhöhte Kanten im Vergleich zu ihrem Mittenbereich haben, sowie Metallbänder mit Kantenwulsten üblicherweise nicht gewünscht.Background of the present invention is the fact that the requirements for the setting accuracy of a profile of a metal strip increase at least at individual predetermined bandwidth positions, so-called reference positions, as well as the dimensional accuracy of the profile contour of the metal strip. Depending on the planned application of a metal strip z. B. parabolic hot strip profile contours expected with a predetermined profile height at a certain reference position to facilitate further processing in a downstream cold rolling mill (tandem mill). Alternatively, box sections may be required, d. H. Metal bands with a flat cross-section in the middle, which decreases more towards the band edges; This requirement is made for example on metal bands, which are to be divided later in the longitudinal direction. Conversely, concave band profiles, i. H. Band profiles, which have thicker or raised edges compared to their middle region, and metal bands with Kantenwulsten usually not desired.
Um die gewünschten Bandprofile möglichst präzise herstellen zu können werden im Stand der Technik bereits verschiedene Ansätze vorgeschlagen.In order to produce the desired band profiles as precisely as possible, various approaches have already been proposed in the prior art.
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Weiterhin ist das Vorgehen gemäß dem Oberbegriff des Patentanspruchs 1 oder/und 3 im Stand der Technik bekannt. Demnach werden ein Prognosewert für das Bandprofil und Einstellwerte für Profilstellglieder beim Walzen eines n'ten Metallbandes an einer vorbestimmten Referenzposition mit Hilfe eines mathematisch physikalischen Prozess-Modells simuliert und berechnet. Die Simulation erfolgt gegebenenfalls unter Berücksichtigung von Restriktionen und Einsatz von verschiedenen Profil-Stellgliedern. Nach einem erfolgten Walzen des n'ten Metallbandes wird ein Adaptionswert berechnet auf Basis der Differenz zwischen dem besagten Prognosewert und einem gemessenen Ist-Wert für das Bandprofil des n'ten Metallbandes an der besagten Referenzposition. Bei der Referenzposition handelt es sich um eine vorbestimmte Bandbreitenposition gemessen von der Naturkante des Metallbandes, beispielsweise 25 oder 40 mm. Nach dem Stand der Technik wird der besagte Prognosewert und der besagte Adaptionswert lediglich an einer einzigen Referenzposition bestimmt bzw. vorgegeben, um auf dieser Basis einzelne Zielvorgaben für das Bandprofil des Metallbandes zu definieren.Furthermore, the procedure according to the preamble of
Ausgehend von diesem Stand der Technik liegt der Erfindung die Aufgabe zugrunde, ein bekanntes Verfahren zum Herstellen von Metallbändern in einer Walzanlage dahingehend weiterzubilden, dass - bei der zukünftigen Herstellung von Metallbändern - eine genauere Prognose der Profilkontur des Metallbandes über der Breite sowie eine genauere Einstellung von Profilstellgliedern der Walzanlage möglich ist.Based on this prior art, the invention has the object, a known method for producing metal strips in one To further develop rolling plant to the effect that - in the future production of metal strips - a more accurate forecast of the profile contour of the metal strip across the width and a more accurate adjustment of profile actuators of the rolling mill is possible.
Diese Aufgabe wird durch das in Patentanspruch 1 und 3 beanspruchte Verfahren gelöst.This object is achieved by the method claimed in
Beim dem Verfahren nach Anspruch 1 wird der Prognosewert für die Profilkontur im Rahmen der Simulation des Walzprozesses vor dem Walzen des Metallbandes berechnet. Im Unterschied dazu wird der Prognosewert gemäß dem Verfahren nach Anspruch 3 nicht in der Simulation vor dem Walzen, sondern durch eine Nachberechnung nach dem erfolgten Walzen des Metallbandes berechnet.In the method according to
Anders ausgedrückt: Alternativ kann es sich bei der Adaptionswertberechnung je nach Adaptionsphilosophie bei dem Prognosewert gemäß Anspruch 1 um den im Rahmen der Simulation des Walzprozesses errechneten Wert des Profils mit Verwendung von Presetwerten (erwartete Walzkraft etc.) oder gemäß Anspruch 3 um das Ergebnis einer Nachrechnung mit Ist-Bedingungen (gemessene Walzkräfte etc.) handeln.In other words, alternatively, the adaptation value calculation depending on the adaptation philosophy in the prognosis value according to
Grundsätzlich wird bei beiden Verfahren angestrebt, dass die berechneten Prognosewerte mit den vorgegebenen Zielwerten übereinstimmen; aufgrund von prozess- oder analgenspezifischen Besonderheiten kann es jedoch vorkommen, dass die Prognosewerte nicht genau, sondern nur näherungsweise mit den Zielwerten übereinstimmen.In principle, the aim in both methods is that the calculated forecast values coincide with the predetermined target values; However, due to process- or analgen-specific peculiarities, it may happen that the forecast values do not exactly match, but only approximately with the target values.
Die Berechnung der Prognosewerte für die Bandprofile an den verschiedenen Referenzpositionen bi erfolgt bei gleicher Einstellung der Profilstellglieder. Dies gilt in beiden beanspruchten Verfahren.The calculation of the prediction values for the band profiles at the different reference positions bi is carried out with the same setting of the profile actuators. This applies in both claimed methods.
Der Begriff "Metallband" schließt auch Metallblech mit ein.The term "metal strip" also includes metal sheet.
Der Begriff "Walzanlage" schließt sowohl Einzelgerüste, beispielsweise Grobblechgerüste, Steckel- oder Twin-Steckel-Gerüste etc., aber auch ganze Fertigwalzstraßen mit ein.The term "rolling mill" includes both single scaffolding, such as heavy plate scaffolding, Steckel or Twin Steckel scaffolding, etc., but also whole finishing mills with a.
Der Begriff "Referenzposition bi" bezeichnet vorzugsweise einen Unterfall der allgemeinen Positionen m in Breitenrichtung des Metallbandes. Während normale Bandbreitenpositionen durch ihren jeweiligen Abstand von der Mitte des Metallbandes in Breitenrichtung definiert werden, werden Referenzpositionen durch einen jeweils vorgegebenen Abstand von der Bandkante oder Naturkante des Metallbandes definiert. Für genormte Referenzpositionen, z. B. 25 mm, 40 mm oder eine andere Referenzposition, z. B. 100 mm von der Naturkante des Metallbandes werden typischerweise Werte für die Profilkontur vorgegeben, z. B. als C25-, C40- oder C100-Werte. Die Referenzpositionen sind für verschiedene Bandbreiten bzw. für alle Metallbänder vorzugsweise gleich. Ob es sich bei den C...-Werten um Zielwerte, Prognosewerte oder Adaptionswerte handelt, ergibt sich jeweils aus dem Zusammenhang.The term "reference position bi" preferably designates a subjacent of the general positions m in the width direction of the metal strip. While normal bandwidth positions are defined by their respective distance from the center of the metal strip in the width direction, reference positions are defined by a respective predetermined distance from the belt edge or natural edge of the metal strip. For standardized reference positions, eg. B. 25 mm, 40 mm or another reference position, z. B. 100 mm from the natural edge of the metal strip are typically given values for the profile contour, z. As C25, C40 or C100 values. The reference positions are preferably the same for different bandwidths or for all metal bands. Whether the C ... values are target values, forecast values or adaptation values is determined from the context.
Der Begriff "Prozessmodell" meint ein mathematisches / physikalisches Modell zur Simulation eines Walzprozesses. Es ist insbesondere geeignet, Prognosewerte und Profilkonturen für das Metallband sowie die Einstellwerte von Profilstellgliedern zu berechnen. Das Prozessmodell wird auch als "Profile Contour and Flatness Control" PCFC bezeichnet.The term "process model" means a mathematical / physical model for simulating a rolling process. In particular, it is suitable to calculate prognosis values and profile contours for the metal strip as well as the setting values of profile actuators. The process model is also referred to as "Profile Contour and Flatness Control" PCFC.
Der Begriff "berechneter Wert" meint "Prognosewert". Analog meint "berechnete Kontur" "prognostizierte Kontur".The term "calculated value" means "forecast value". Similarly, "calculated contour" means "predicted contour".
Der Begriff "späteres Herstellen" oder "zukünftiges Herstellen" meint ein Herstellen bzw. Walzen zeitlich nach der Ermittlung des neuen Adaptionswertes für das mindestens n'te Metallband. Das spätere Herstellen kann sich auf weitere Längsabschnitte desselben n'ten Metallbandes oder auf ein komplett neu herzustellendes Metallband n+x beziehen.The term "later production" or "future production" means a manufacturing or rolling time after the determination of the new adaptation value for the at least n'te metal strip. Later manufacturing can be further Obtain longitudinal sections of the same nth metal strip or a completely new metal strip n + x.
Der Begriff "n+x" mit x=1, 2, 3, ... etc x∈ bezeichnet ein zukünftig nach dem n'ten Metallband hergestelltes bzw. herzustellendes Metallband. So bezeichnet beispielsweise n+2 das zweite nach dem n'ten Metallband herzustellende, insbesondere zu walzende Metallband.The term "n + x" with x = 1, 2, 3, ... etc x∈ refers to a future produced after the n'ten metal strip or metal strip. For example, n + 2 denotes the second metal strip to be produced after the nth metal strip, in particular to be rolled.
Das jeweils zukünftig zu walzende Band wird also allgemein für die entsprechende Preset-Berechnung jeweils n+x bezeichnet. Hierbei werden die zuvor berechneten Adaptionswerte verwendet.The respective future to be rolled band is thus generally designated for the corresponding preset calculation each n + x. The previously calculated adaptation values are used here.
Die Begriffe "Profilkontur" und "Bandprofil", jeweils in Breitenrichtung des Metallbandes gesehen, werden gleichbedeutend verwendet.The terms "profile contour" and "band profile", each seen in the width direction of the metal strip, are used synonymously.
Der Kerngedanke der vorliegenden beanspruchten Erfindung besteht darin, dass ein Adaptionswert als Differenz zwischen einem gemessenen Ist-Wert und einem errechneten, d. h. prognostizierten Wert für die Profilkontur des Metallbandes nicht nur, wie im Stand der Technik bisher üblich, an nur einer (Zahlwert) bestimmten Referenzposition, sondern an einer Mehrzahl von Referenzpositionen ermittelt wird. Hiermit ist vorteilhafterweise eine Bandkonturadaption möglich. Diese Mehrzahl von ermittelten Adaptionswerten über der Bandbreite kann/können bei der Berechnung und Einstellung der Profilstellglieder und bei der Berechnung der Profilkontur bzw. bei der Berechnung der Prognosewerte für die zukünftig zu walzende Metallbänder berücksichtigt werden. Durch das Vorsehen der Mehrzahl von Adaptionswerten und aufgrund genauerer Kenntnis der Profilkontur können die Profilstellglieder vorteilhafterweise genauer im Hinblick auf die angestrebten Zielwerte für einen weiten Längsabschnitt des n'ten Metallbandes oder für die Profilkontur des n+x'ten Metallbandes bzw. die Profilkontur bei zukünftig zu walzenden Metallbändern eingestellt werden. Auch die Berechnung von Prognosewerten für die Profilkontur ist damit für das n+x'te Metallband, d. h. für zukünftig zu walzende Metallbänder genauer möglich.The core idea of the claimed claimed invention is that an adaptation value as the difference between a measured actual value and a calculated, ie predicted value for the profile contour of the metal strip not only, as usual in the prior art, at only one (number) determined Reference position, but at a plurality of reference positions is determined. This advantageously a Bandkonturadaption is possible. This plurality of determined adaptation values over the bandwidth can be taken into account in the calculation and adjustment of the profile actuators and in the calculation of the profile contour or in the calculation of the prognosis values for the metal strips to be rolled in the future. By providing the plurality of adaptation values and due to more accurate knowledge of the profile contour, the profile actuators can advantageously be more accurate with regard to the desired target values for a long longitudinal section of the nth metal strip or for the profile contour of the n + x'ten metal strip or the profile contour in the future to be rolled metal bands. Also the calculation of Forecast values for the profile contour is therefore more accurate for the n + x'th metal strip, ie for metal strips to be rolled in the future.
Gemäß einem vorteilhaften Ausführungsbeispiel wird bei der Ermittlung der Adaptionswerte an den Referenzpunkten bi zwischen Kurzzeitadaptionswerten und Langzeitadaptionswerten unterschieden. Dies ermöglicht es vorteilhafterweise, dass das an mindestens einem Band n Gelernte für ein später zu walzendes Band n+x genutzt wird, denn gleiche Profilkonturabweichungen zwischen gemessenen und prognostizierten Profilkonturwerten treten bei einem Folgeband oder bei einem später unter ähnlichen Bedingungen gewalzten Band immer wieder recht häufig auf.According to an advantageous embodiment, a distinction is made in the determination of the adaptation values at the reference points bi between short-term adaptation values and long-term adaptation values. This advantageously makes it possible to use the learned at at least one band n n for a later to be rolled band n + x, because the same profile contour deviations between measured and predicted profile contour values occur again and again quite frequently in a follower band or at a later rolled under similar conditions on.
Die Berechnung des Kurzzeitadaptionswertes erfolgt gemäß der Formel:
- mit K: Kurzzeitadaption und
- ΔCK (n-x)bi : Alter Kurzzeitadaptionswert
- CIst (n)bi: Gemessener Ist-Wert für die Profilkontur des n'ten Bandes
- CP (n)bi: Errechneter Prognosewert bzw. errechnetes Bandprofil
- x=1, 2, 3 ...
- n: betreffendes Metallband
- with K: short-term adaptation and
- Δ C K ( nx ) bi : age short term adaptation value
- C Is ( n ) bi : Measured actual value for the profile contour of the nth band
- C P ( n ) bi: Calculated forecast value or calculated band profile
- x = 1, 2, 3 ...
- n: concerned metal band
Bei Anwendung dieser Formel für den Kurzzeitadaptionswert wird der Summand ΔCK(n-x)bi bei Neustart eines Walzprozesses, z. B. nach einem Arbeitswalzenwechsel, mit z. B. 0 oder einem anderen typischen Anfangswert vorbesetzt. Der Kurzzeitadaptionswert berechnet sich dann als Summe aus dem Anfangswert und der Differenz zwischen dem Ist-Wert CIst(n)bi für die Profilkontur und dem Prognoswert CP(n)bi des n'ten Metallbandes an der Referenzposition bi.Using this formula for the short term adaptation value, the summand ΔC K (nx) bi at restart of a rolling process, e.g. B. after a work roll change, with z. 0 or another typical initial value. The short-term adaptation value is then calculated as the sum of the initial value and the difference between the actual value C actual (n) bi for the profile contour and the prediction value C P (n) bi of the nth metal band at the reference position bi.
Der Langzeitadaptionswert ΔCL bi an einer Referenzposition bi ergibt sich durch Ausführen folgender Schritte:
- Ermitteln der Adaptionswerte durch Wiederholen der Schritte a) bis f)
nach Anspruch 1 oder 3 an der Mehrzahl I von Referenzpositionen bi für eine Mehrzahl von vordem n+x'ten Metallband gewalzten Metallbändern einer Adaptionsgruppe; und - Berechnen der Langzeitadaptionswerte ΔCLbi durch Bildung der Mittelwerte der Adaptionswerte oder Bildung der Mittelwerte der Differenzen zwischen Ist-Werten und Prognosewerten für die Profilkontur für die Mehrzahl von Metallbändern jeweils an einer der Referenzpositionen bi.
- Determining the adaptation values by repeating steps a) to f) according to
1 or 3 at the plurality I of reference positions bi for a plurality of metal bands of an adaptation group rolled prior to n + x th metallic strip; andclaim - Calculating the long-term adaptation values ΔC L bi by forming the average values of the adaptation values or forming the mean values of the differences between actual values and prognosis values for the profile contour for the plurality of metal bands, each at one of the reference positions bi.
Für die Bestimmung des Prognosewertes CP(n+x)bi des Metallbandes n+x gemäß Anspruch 1 oder 3 wird gegebenenfalls der Langzeitadaptionswert ΔCLbi aus der entsprechenden Adaptionsgruppe entnommen, zu der das Metallband n+x gehört.For the determination of the prognosis value C P (n + x) bi of the metal strip n + x according to
Anders ausgedrückt kann sich auch der Langzeitadaptionswert aus einer Mittelwertebildung der Gesamtadaptionswerte (Langzeit- und Kurzzeitadaptionswert) von j Bändern, die der gleichen Adaptionsgruppe in der Vergangenheit gewalzt worden sind, ergeben.In other words, the long-term adaptation value may also result from an averaging of the total adaptation values (long-term and short-term adaptation value) of j bands that have been rolled in the same adaptation group in the past.
Die maximal herangezogene Anzahl in der Vergangenheit gewalzter Bänder j kann z.B. 100 oder 50 betragen und ist frei festlegbar. Die Differenz bei einem Band wirkt sich auf den Langzeitadaptionswert also nur zu einem j-ten Teil aus. Der ermittelte Langzeitadaptionswert kann bei der PCFC-Preset-Berechnung zu 100% oder nur zu einem Teil, abhängig von frei festlegbaren Randbedingungen, verwendet werden.The maximum number used in the past rolled bands j can e.g. 100 or 50 and is freely definable. The difference in a band thus affects the long-term adaptation value only for a jth part. The determined long-term adaptation value can be used in the PCFC preset calculation to 100% or only partially, depending on freely definable boundary conditions.
Die Definition und die Berechnung des Langzeitadaptionswertes ΔCL(n)bi können die Kenntnis des Kurzzeitadaptionswertes ΔCK(n)bi voraussetzen. Demgegenüber kann in Ausnahmefällen der Kurzzeitadaptionswert auch alleine verwendet werden.The definition and the calculation of the long-term adaptation value ΔC L (n) bi may presuppose the knowledge of the short-term adaptation value ΔC K (n) bi. In contrast, in exceptional cases, the Kurzzeitadaptionswert can also be used alone.
Alternativ zu dem Langzeit- und/oder Kurzzeitadaptionswert kann auch ein Gesamtadaptionswert zur Ermittlung der Einstellwerte der Profilstellglieder und zur Bandkonturbestimmung an den Referenzpunkten bi gemäß Anspruch 6 ermittelt werden. Dieser Gesamtadaptionswert berechnet sich dann als Summe aus dem Kurzzeitadaptionswert und dem Langzeitadaptionswert jeweils an einer Referenzposition bi.As an alternative to the long-term and / or short-term adaptation value, it is also possible to determine a total adaptation value for determining the setting values of the profile actuators and for determining the contour of the band at the reference points bi according to claim 6. This total adaptation value is then calculated as the sum of the short-term adaptation value and the long-term adaptation value in each case at a reference position bi.
Wie sich die Adaptionswerte, gerechneten Profilwerte und Messwerte etc. an einer Referenzposition von Band zu Band für 4 Bänder der gleichen Langzeitadaptionsgruppe verhalten können, wird in dem nachfolgenden Beispiel verdeutlicht:
Gemäß einem weiteren Ausführungsbeispiel können der ermittelte Kurzzeitadaptionswert, der ermittelte Langzeitadaptionswert oder der ermittelte Summenadaptionswert bei der Berechnung zur Voreinstellung der Profilstellglieder entweder zu 100 % oder nur zu einem gewünschten Teil verwendet werden. Der gewünschte Anteil kann abhängig von frei festlegbaren Randbedingungen gewählt werden. Je nach gewählter Gewichtung, z. B. 33 oder 50 % wird der Adaptionseffekt gedämpft bzw. geglättet. Die Änderung des Kurzzeitadaptionswerte von Band zu Band kann durch einen Maximalwert, z. B. 10 µm, begrenzt werden, um eventuelle einzelne Messfehler nicht zu hoch zu gewichten. Auch kann der Kurzzeitadaptionswert ofenabhängig oder abhängig von anderen Prozessgrößen sein. Der Kurzzeitadaptionswert bezieht sich i. d. R. auf die Profildifferenzen des letztens Bandes n. In Ausnahmefällen kann z. B. die Profildifferenz auf das vorletzte Band bezogen sein. Dann entspricht n dem Band n-1 bzw. allgemein n-x.According to a further embodiment, the determined short-term adaptation value, the determined long-term adaptation value or the determined sum adaptation value can be used in the calculation for presetting the profile actuators either to 100% or only to a desired part. The desired proportion can be selected depending on freely definable boundary conditions. Depending on the selected weighting, z. B. 33 or 50%, the adaptation effect is attenuated or smoothed. The change of short-term adaptation values from band to band may be limited by a maximum value, e.g. B. 10 microns, are limited to not weight any individual measurement errors too high. Also, the short term adaptation value may be furnace dependent or dependent on other process variables. The Kurzzeitadaptionswert usually refers to the profile differences of the last band n. In exceptional cases, z. B. the Profile difference be related to the penultimate band. Then n corresponds to the band n-1 or generally nx.
Die erfindungsgemäß berechneten Adaptionswerte an den einzelnen Breitenpositionen bi des Metallbandes können vorteilhafterweise auch dazu verwendet werden, die Adaptionskontur des Metallbandes zu ermitteln, indem die einzelnen vorhandenen Adaptionswerte mit mindestens einer geeigneten Ansatzfunktion miteinander zur Adaptionskontur verbunden werden. Die Adaptionskontur kann durch die I für das Metallband n+x ermittelten Adaptionswerte ΔC(n+x)bi geführt werden oder die Adaptionskontur läuft je nach Ansatzfunktion bzw. Glättungsfunktion dicht an den Adaptionswerten vorbei (Approximation). Eine Ansatzfunktion wird also zur Verbindung von Adaptionswerten, Interpolation, Glättung, Extrapolation oder Approximation verwendet und beispielsweise so bezeichnet. Adaptionswerte liegen in der Regel an mindestens zwei Referenzpositionen bi vor, und vorzugsweise liegt mindestens ein weiterer Adaptionskonturwert an einer weiteren Bandbreitenposition m vor, bei der es sich nicht um eine Referenzposition handelt. Weitere Bandbreitenpositionen werden typischerweise durch das Prozessmodell vorgegebenen. Je nachdem für welche Bandbreitenpositionen die Adaptionswerte bekannt sind, kann die Adaptionskontur entweder nur über einem begrenzten Abschnitt bzw. Bereich oder über der gesamten Breite des Metallbandes ermittelt werden. Die Dichte der bekannten Adaptionswerte kann in einzelnen Bereichen über der Breite des Metallbandes unterschiedlich sein. Vorzugsweise ist die Dichte der bekannten Adaptionswerte im Randbereich des Metallbandes, dort vorzugsweise an den Referenzpositionen, größer als in dem Mittenbereich, auch Bodybereich genannt. Dies liegt darin begründet, dass die Anforderungen an die Genauigkeit der Profilkontur im Randbereich oftmals höher sind als im Mittenbereich. Ist für einen extremen Sonderfall jeder geglättete Messpunkt, den ein Profilmessgerät liefert, ein Adaptionspunkt bi, so kann die Adaptionskontur auch ohne weitere Bestimmung von einer Interpolationsfunktion ermittelt werden; in diesem Fall besteht die Adaptionskontur einfach in der benachbarten Abfolge der Vielzahl von Adaptionswerten. Im Regelfall beträgt die maximale Anzahl I von Bandbreitenpositionen, insbesondere Referenzpositionen, jedoch weniger als 10.The adaptation values calculated according to the invention at the individual width positions bi of the metal strip can advantageously also be used to determine the adaptation contour of the metal strip by connecting the individual existing adaptation values with one another to at least one suitable attachment function. The adaptation contour can be guided by the adaptation values Δ C ( n + x ) bi determined for the metal band n + x, or the adaptation contour runs close to the adaptation values depending on the approach function or smoothing function (approximation). An approach function is thus used to connect adaptation values, interpolation, smoothing, extrapolation or approximation and is for example so designated. As a rule, adaptation values are present at at least two reference positions bi, and preferably at least one further adaptation contour value is present at a further bandwidth position m, which is not a reference position. Other bandwidth positions are typically dictated by the process model. Depending on which bandwidth positions the adaptation values are known for, the adaptation contour can be determined either only over a limited section or area or over the entire width of the metal strip. The density of the known adaptation values may be different in individual regions over the width of the metal strip. Preferably, the density of the known adaptation values in the edge region of the metal strip, there preferably at the reference positions, greater than in the central region, also called body region. This is due to the fact that the requirements for the accuracy of the profile contour in the edge region are often higher than in the middle region. If, for an extreme special case, every smoothed measuring point supplied by a profilometer has an adaptation point bi, then the adaptation contour can also be determined without further determination by an interpolation function; In this case, the adaptation contour simply exists in the adjacent sequence the plurality of adaptation values. As a rule, the maximum number I of bandwidth positions, in particular reference positions, is less than 10.
Gemäß einem vorteilhaften Ausführungsbeispiel der Erfindung wird die besagte und ermittelte Adaptionskontur für das n+x'te Metallband mit einer von dem Prozessmodel prognostizierten, nicht adaptierten berechneten Profilkontur addiert, um im Ergebnis eine adaptierte Profilkontur für das n+x'te Metallband zu erhalten.According to an advantageous exemplary embodiment of the invention, the said and determined adaptation contour for the n + x'th metal band is added to a non-adapted calculated profile contour predicted by the process model in order to obtain an adapted profile contour for the n + x'th metal band.
Die Ermittlung der Ansatzfunktionen bzw. Interpolationsfunktionen der Adaptionskontur oder der adaptierten Profilkontur kann unterschiedlich für unterschiedliche Breitenabschnitte des Metallbandes erfolgen. Ein erster Breitenabschnitt kann beispielsweise in dem mittleren Breitenbereich und zweiter Breitenabschnitt oder weitere Breitenabschnitte können beispielsweise im Randbereich, auch genannt Kantenbereich des Metallbandes liegen.The determination of the approach functions or interpolation functions of the adaptation contour or of the adapted profile contour can be carried out differently for different width sections of the metal strip. A first width section may be, for example, in the middle width area and second width section or further width sections may be, for example, in the edge area, also called edge area of the metal strip.
Bei zwei Breitenabschnitten, die in Breitenrichtung aneinandergrenzen, werden die Ansatzfunktionen bzw. wird die Adaptionskontur oder die adaptierte Profilkontur über den beiden Breitenabschnitten vorzugsweise so gewählt, dass die Konturverläufe an der Grenze von einem zum anderen Bandabschnitt stetig differenzierbar sind, insbesondere eine gleiche Steigung haben. Durch diese Bedingung wird vermieden, dass die Konturen an der Grenze zwischen den beiden Bandabschnitten einen Knick aufweisen; stattdessen gehen sie dann glatt ineinander über.In the case of two width sections adjoining in the width direction, the attachment functions or the adaptation contour or the adapted profile contour over the two width sections are preferably selected such that the contour progressions are continuously differentiable at the border from one band section to another, in particular have the same pitch. This condition avoids that the contours at the boundary between the two band sections have a kink; instead, they go smoothly together.
Die Adaptionskontur oder die adaptierte Profilkontur über einem Breitenabschnitt des Metallbandes können in einen benachbarten Breitenabschnitt hinein extrapoliert werden zum Ermitteln einer extrapolierten adaptierten Adaptionskontur oder einer extrapolierten adaptierten Profilkontur über dem benachbarten Breitenbereich, insbesondere wenn dort keine Adaptionswerte oder gemessenen Profilkonturwerte bekannt sind.The adaptation contour or the adapted profile contour over a width section of the metal strip can be extrapolated into an adjacent width section for determining an extrapolated adapted adaptation contour or an extrapolated adapted profile contour over the adjacent width region, in particular if no adaptation values or measured profile contour values are known there.
Die besagte mindestens eine Ansatzfunktion bzw. Approximationsfunktion oder Interpolartionsfunktion zur Verbindung einzelner Adaptions- oder Profilkonturwerte oder die besagte Extrapolationsfunktion können aus einer linearen Funktion, einer Polynomfunktion beliebiger Ordnung, einer Exponentialfunktion, einer trigonometrischen Funktion, einer Splinefunktion oder einer Kombination von verschiedenen Funktionen gebildet sein. Auch die Ansatzfunktionen bzw. Interpolartionsfunktionen können für verschiedene Breitenabschnitte des Metallbandes unterschiedlich sein.The said at least one starting function or approximation function or interpolation function for connecting individual adaptation or profile contour values or the said extrapolation function can be formed from a linear function, a polynomial function of any order, an exponential function, a trigonometric function, a spline function or a combination of different functions. The starting functions or interpolation functions can also be different for different width sections of the metal strip.
Anstelle des gemessenen Ist-Wertes der Profilkontur des Metallbandes an der Referenzposition bi kann auch ein Mittelwert aus gemessenen Ist-Werten an den spiegelbildlichen Referenzpositionen bi auf der rechten und linken Hälfte des Metallbandes - in Walzrichtung gesehen - verwendet werden. Dabei fungiert die fiktive Ebene, auch Breitenebene genannt, auf halber Breite bzw. Breitenhöhe des Metallbandes, die sich in Längsrichtung des Metallbandes erstreckt, als Spiegelebene.Instead of the measured actual value of the profile contour of the metal strip at the reference position bi, it is also possible to use an average of measured actual values at the mirror-image reference positions bi on the right and left half of the metal strip, as viewed in the rolling direction. The imaginary plane, also called the width plane, acts as a mirror plane at half the width or width of the metal strip, which extends in the longitudinal direction of the metal strip.
Die adaptierten Profilkonturwerte oder die adaptierte Profilkontur können zunächst auch nur für eine Bandhälfte, z. B. die Bandhälfte auf der Bedienseite ermittelt werden und nachfolgend für die andere Bandhälfte, z. B. für die Bandhälfte auf der Antriebsseite gespiegelt werden.The adapted profile contour values or the adapted profile contour can initially only for a band half, z. B. the band half can be determined on the operating side and below for the other band half, z. B. mirrored for the band half on the drive side.
Der gemessene Ist-Wert der Profilkontur kann als direkter Messwert an der Referenzposition bi oder als ein durch eine Ausgleichsfunktion über der Breite, beispielsweise eine Messwert-Interpolationsfunktion, geglätteter Profilmesswert verwendet werden.The measured actual value of the profile contour can be used as a direct measured value at the reference position bi or as a profile measured value smoothed by a compensation function across the width, for example a measured value interpolation function.
Die gemessenen Ist-Werte CIst(n)bi bei der Profilkontur können an einer definierten Bandlängenposition ermittelt oder über einer Bandsegmentlänge gemittelt oder über einer gesamten Bandlänge gemittelt werden.The measured actual values C ist (n) bi in the profile contour can be determined at a defined tape length position or averaged over a tape segment length or averaged over an entire tape length.
Vorteilhafterweise wird die erfindungsgemäß ermittelte adaptierte Profilkontur im Hinblick auf Profilanomalien, wie beispielsweise Bandwulste, d. h. unerwünschte Verdickungen im Bandkantenbereich, oder steile Bandprofilabfälle, insbesondere im Kantenbereich des Metallbandes analysiert. Die Analyse erfolgt vorzugsweise online bzw. in einem Echtzeitbetrieb. Dann können die Profilstellglieder geeignet eingestellt werden, um die besagten Profilanomalien bei nachfolgend gewalzten Abschnitten in Längsrichtung desselben Metallbandes oder bei nachfolgend gewalzten Metallbändern aktiv zu bekämpfen bzw. zu reduzieren.Advantageously, the adapted profile contour determined according to the invention is determined with regard to profile anomalies, such as, for example, band bulges, d. H. unwanted thickening in the band edge region, or steep band profile waste, especially in the edge region of the metal strip analyzed. The analysis is preferably carried out online or in a real-time mode. Then, the profile actuators can be suitably adjusted to actively combat or reduce said profile anomalies in subsequently rolled sections in the longitudinal direction of the same metal strip or subsequently rolled metal strips.
Ohne Nutzung der erfindungsgemäßen Adaptionskontur kann es vorkommen, dass Metallbänder mit normalen Profilkonturen errechnet werden, und dass sich aber in der Praxis dennoch Bandwulste an den Kanten ausbilden. Die erfindungsgemäß ermöglichte Ermittlung der Adaptionskontur und die dadurch ermöglichte Ermittlung einer präziseren adaptierten Profilkontur eröffnet neue Möglichkeiten der verbesserten Ermittlung der Profilkontur. Wird z. B. für ein Metallband eine Kantenwulsthöhe errechnet, die höher ist als ein zulässiger Schwellenwert, so wird von dem Prozessmodell im Rahmen von zulässigen vorgegebenen Profilniveaugrenzen zwischen beispielsweise C40-Zielmin und C40-Zielmax das Bandprofilniveau 40 mm entfernt von der Naturkante des Metallbandes automatisch auf einen Wert gesetzt, in der Regel angehoben, so dass die maximale zulässige Wulsthöhe nicht überschritten bzw. reduziert wird oder/und es erfolgt ein gezielter Einsatz von Profilstellgliedern (z. B. Walzenverschiebung etc.) um die Wulsthöhe zu vermindern.Without the use of the adaptation contour according to the invention, it may happen that metal bands are calculated with normal profile contours, and that, however, in practice, band bulges form on the edges. The inventively made possible determination of the adaptation contour and the thus made possible determination of a more precise adapted profile contour opens up new possibilities of improved determination of the profile contour. If z. B. calculated for a metal band an edge bead height which is higher than an allowable threshold, the
Weitere vorteilhafte Ausgestaltungen des erfindungsgemäßen Verfahrens sind Gegenstand der abhängigen Ansprüche, insbesondere der Ansprüche 21 bis 23.Further advantageous embodiments of the method according to the invention are the subject matter of the dependent claims, in particular of claims 21 to 23.
Unter Ausnutzung des Materialquerflussverhaltens kann ergänzend in zwei Schritten das Bodybandprofil, d. h. die Profilkontur im Mittenbereich des Metallbandes, und das Kantenbandprofil unter Nutzung der Konturadaption genauer eingestellt werden. Zunächst werden die Profilstellglieder im vorderen Bereich der Walzanlage bzw. bei den ersten Stichen eines Reversierwalzwerkes so eingesetzt, dass sich das Bodyprofil einstellt. Im zweiten Schritt werden die Profilstellglieder für die hinteren Gerüste oder letzten Stiche so eingestellt, dass das nominelle Profil an der Bandkante ebenfalls eingestellt bzw. so eine Gesamtkontur geformt (designed) wird.Taking advantage of the material transverse flow behavior, the body band profile, ie the profile contour in the middle region of the metal band, and the edge band profile using the contour adaptation can be adjusted more precisely in two steps. First, the profile actuators in the front Area of the rolling mill or in the first stitches of a reversing mill used so that adjusts the body profile. In the second step, the profile actuators for the rear scaffolds or last stitches are set so that the nominal profile is also set at the edge of the strip or so that an overall contour is shaped.
Es sind also mehrere Zielprofilwerte für verschiedene Breitenpositionen vorgebbar, die alle eingestellt oder/und die in bestimmten Grenzen gehalten bzw. überwacht werden. Beispielsweise kann durch ein erweitertes Prozessmodell ein Zielprofilwert C25 = 30µm im Randbereich eingestellt oder die Abweichung minimiert werden und gleichzeitig für einen Zielprofilwert im Bodybandbereich die Grenze C100 > 15µm einhalten werden.Thus, several target profile values for different width positions can be specified, all of which are set or / and which are kept or monitored within certain limits. For example, by an extended process model, a target profile value C25 = 30 μm can be set in the edge region or the deviation can be minimized and at the same time the limit C100> 15 μm can be maintained for a target profile value in the bodyband region.
Es kann bei der Setzstrategie der Profilwert im Bandkantenbereich z.B. C25 oder alternativ der Bodybandprofilwert z.B. C100 als primäres Ziel variabel und von Band zu Band unterschiedlich vorgegeben werden. Zweckmäßigerweise werden (wie beschrieben) an diesen Referenzpunkten die Bandkonturwerte bzw. die Bandkonturen adaptiert.In the setting strategy, the profile value in the band edge region may be e.g. C25 or alternatively the bodyband profile value e.g. C100 as the primary target variable and given differently from band to band. Appropriately, the band contour values or the band contours are adapted (as described) at these reference points.
Die adaptierte Profilkonturfunktion, bestehend aus mmax Profilkonturwerten C(n+x)m wird vorteilhafterweise bezüglich Bandprofilanomalien analysiert, und mittels des Prozessmodells wird die Information der analysierten Fertigbandkonturfehler mittels nicht näher beschriebenen Übertragungsfunktionen oder Wichtungsfaktoren auf die Berechnung der Zwischengerüst- oder Zwischenstichkonturen übertragen. Alternativ oder zusätzlich werden die ermittelten Adaptionswerte an den Positionen bi mittels nicht näher beschriebenen Übertragungsfunktionen oder Wichtungsfaktoren auf die Berechnung der Zwischengerüst- oder Zwischenstichkonturen übertragen.The adapted profile contour function, consisting of m max profile contour values C (n + x) m, is advantageously analyzed with respect to band profile anomalies, and by means of the process model the information of the analyzed finished band contour errors is transmitted to the calculation of the interstitial or intermediate stitch contours by means of transfer functions or weighting factors not described in detail. Alternatively or additionally, the determined adaptation values at the positions bi are transmitted to the calculation of the interstand or intersection contours by means of transfer functions or weighting factors not described in greater detail.
Die genaue quantitative Kenntnis des Ortes der Bandkonturanomalien (Wulsthöhe, Wulstbreite, Kantenabfall zwischen zwei definierten Profilpunkten (z.B. C25-C100) sowie Profilabweichungen in dem mittleren Bandbereich (bzw. an C100, C125, C150 oder C200) erlauben also eine gezielte Analyse, ob Bandkonturfehler an der Kante, im mittleren Bereich oder in beiden Bereichen auftreten. Mit dieser Kenntnis werden in einer Profil- und Planheitsberechnung iterativ die Profilstellglieder der verschiedenen Gerüste gezielter eingesetzt, um Bandprofilanomalien zu vermeiden oder zu reduzieren.The exact quantitative knowledge of the location of the band contour anomalies (bead height, bead width, edge drop between two defined profile points (eg C25-C100) as well as profile deviations in the middle band range (or at C100, C125, C150 or C200) thus allow a targeted analysis of whether band contour errors occur at the edge, in the middle range or in both ranges. With this knowledge, in a profile and flatness calculation, the profile actuators of the different frameworks are iteratively used in a more targeted manner in order to avoid or reduce band profile anomalies.
Hierdurch lassen sich Profilstellglieder, wie z.B. variable Arbeitswalzenkühlsysteme, Zonenkühlung oder lokale Walzenerwärmung zur Beeinflussung des thermischen Crowns, eine Arbeitswalzenverschiebung in Verbindung mit Walzenschliffen (Spezial-Walzenschliffe zur Bekämpfung von Bandwulsten ("Anti-Wulst-Walze") oder zur Bekämpfung von Bandkantenabfällen ("Tapered Roll"), CVC-Walzen, CVC-Walzen mit einem Schliff höherer Ordnung bzw. Polynom n-ter Ordnung bzw. trigonometrische Funktionen), Bandkantenheizungen, Bandzonenkühlungen, Arbeitswalzenbiegungen und/oder Gerüste mit Pair-Cross-Funktion einsetzen. Neben den mechanischen und thermischen Profilstellgliedern wird ggf. auch die Walzkraftumverteilung zur Konturbeeinflussung gezielt verwendet.This allows profile actuators, e.g. variable work roll cooling systems, zone cooling or local roll heating for influencing the thermal crown, a work roll displacement in conjunction with roll grinding ("anti-bead roller" or "tapered roll", CVC roller coiling) Rollers, higher order polynomial or trigonometric functions), band edge heaters, band zone cooling, work roll bends, and / or scaffolds with pair-cross function. In addition to the mechanical and thermal profile actuators, the rolling force redistribution for influencing the contour may also be used selectively.
Der Beschreibung sind insgesamt 5 Figuren beigefügt, wobei
Figur 1- die Profilkontur eines Metallbandes mit zum Verständnis der Erfindung wesentlichen Begriffsdefinition;
- Figuren 2.1, 2.2 und 2.3
- eine Veranschaulichung des erfindungsgemäßen Verfahrens;
Figur 3- eine erste Möglichkeit zur Reduzierung eines unerwünschten Wulstes am Rand des Metallprofils auf Basis des erfindungsgemäßen Verfahrens;
- Figuren 4.1 und 4.2
- eine zweite Möglichkeit zur Reduzierung von unerwünschten Wulsten am Rand des Metallbandes; und
- Figur 5
- die Einstellung der Profilkontur des Metallbandes durch Vorgabe von Zielwerten an mehreren Referenzpositionen
- FIG. 1
- the profile contour of a metal strip with essential for the understanding of the invention definition of terms;
- Figures 2.1, 2.2 and 2.3
- an illustration of the method according to the invention;
- FIG. 3
- a first possibility for reducing an undesirable bead on the edge of the metal profile based on the method according to the invention;
- Figures 4.1 and 4.2
- a second possibility for reducing unwanted beads on the edge of the metal strip; and
- FIG. 5
- the setting of the profile contour of the metal strip by specifying target values at several reference positions
Die Erfindung wird nachfolgend unter Bezugnahme auf die genannten Figuren in Form von Ausführungsbeispielen detailliert beschrieben.The invention will be described in detail below with reference to the said figures in the form of embodiments.
In
Kerngedanke der vorliegenden Erfindung ist eine Adaption der prognostizierten Profilkontur bzw. eine Adaption der Profilkonturwerte, auch Prognosewerte CP(n)bi genannt, des n'ten Metallbandes, jeweils an einer Mehrzahl von Bandbreitenpositionen bi mit i=1,2,3 usw., in
Grundsätzlich handelt es sich bei den Bandbreitenpositionen bi um beliebige Positionen in Breitenrichtung des Metallbandes; normalerweise werden Breitenpositionen durch ihren positiven oder negativen Abstand von der Bandmitte definiert. In einigen genormten Fällen können diese Bandbreitenpositionen jedoch vorteilhafterweise auch über ihren Abstand von der jeweiligen Naturkante des Metallbandes an der Antriebsseite oder/und an der Bedienseite des Metallbandes, dann jeweils in Richtung Bandmitte gemessen, definiert werden. Die so definierten Bandbreitenpositionen werden typischerweise als Referenzpositionen bezeichnet. Diesen normierten Referenzpositionen sind dann typischerweise auch konkrete Profilwerte zugeordnet, die dann beispielsweise als C40 oder C100 bezeichnet werden. Die Zahlenangabe hinter dem C entspricht dann dem Abstand der Bandbreitenposition von der jeweiligen Naturkante des Metallbandes.Basically, the bandwidth positions bi are arbitrary positions in the width direction of the metal strip; Usually, latitude positions are defined by their positive or negative distance from the mid-band. In some standardized cases, however, these bandwidth positions can advantageously also be defined by their distance from the respective natural edge of the metal strip on the drive side or / and on the operating side of the metal strip, then respectively in the direction of the strip center. The bandwidth positions thus defined are typically referred to as reference positions. These normalized reference positions are then typically associated with specific profile values, which are then referred to as C40 or C100, for example become. The figure behind the C then corresponds to the distance of the bandwidth position of the respective natural edge of the metal strip.
In
Alternativ können die gemessenen und berechneten Werte für die Profilkontur auch durch Mittelwertbildung der Konturwerte an den spiegelbildlichen Positionen i=1, i=-1; i=2, i=-2; i=3, i=-3 und/oder i=4, i=-4 auf der Antriebs- und Bedienseite gebildet werden. Negative Indexwerte sollen nur verdeutlichen, dass es sich um eine gegenüberliegende Seite handelt. Vorzugsweise wird hierbei durch die gesamte gemessene Bandkontur eine Glättungsfunktion gelegt um ein eventuelles Rauschen der Bandkontursignale zu unterdrücken. Die Berechnung der Profilkontur und die entsprechende erfindungsgemäße Adaption können symmetrisch nur für eine Bandhälfte oder asymmetrisch über der gesamten Breite erfolgen.Alternatively, the measured and calculated values for the profile contour can also be obtained by averaging the contour values at the mirror-image positions i = 1, i = -1; i = 2, i = -2; i = 3, i = -3 and / or i = 4, i = -4 are formed on the drive and operator side. Negative index values are only intended to make it clear that this is an opposite page. In this case, a smoothing function is preferably applied by the entire measured band contour in order to suppress any noise of the band contour signals. The calculation of the profile contour and the corresponding adaptation according to the invention can be symmetrical only for one band half or asymmetrically over the entire width.
Die
Nicht nur in
Die Abstände dieser Referenzpositionen bi von der Bandkante sind in
In
Die Adaptionskontur ΔC(n+1) m für das n+1'te Metallband ergibt sich dann, wie in
Die Bildung einer Ansatz- bzw. Interpolationsfunktion und die Interpolation zwischen der Bandmitte und dem Referenzpunkt b1 sowie die entsprechende Bildung und Interpolation zwischen dem Referenzpunkt b1 und dem Referenzpunkt b2 können grundsätzlich separat und unabhängig voneinander in den jeweiligen Bandbreitenabschnitten erfolgen. Um einen Knick an einer Übergangsstelle von zwei Interpolationsfunktionen, in
Von dem letzten Adaptionswert, in
Die zuvor gemäß
Alternativ oder zusätzlich kann die zuvor gemäß
Die auf diese Weise gewonnenen neuen adaptierten Prognosewerte oder die neue Profilkontur können vorteilhafterweise verwendet werden, um die Profilstellglieder bei der Herstellung des n+1'ten, allgemein des n+x'ten Metallbandes noch genauer im Hinblick auf gewünschte Zielwerte oder/und Zielkonturen einstellen zu können.The new adapted prognosis values or the new profile contour obtained in this way can advantageously be used to set the profile actuators even more precisely with respect to desired target values and / or target contours in the production of the n + 1'th, in general the n + x'ten metal band to be able to.
Mathematisch ausgedrückt berechnen sich die adaptierten Bandkonturwerte bzw. die adaptierte Bandkontur für das zu walzende beispielsweise n+1'te Metallband gemäß folgender Formel:
- CP(n+1)m
- korrigierte bzw. adaptierte Profilkontur des n+1'ten Metallbandes über der Bandbreite m;
- CP(n+1)mOA
- eine berechnete bzw. prognostizierte Profilkontur des n+1'ten Metallbandes über der Bandbreite m ohne Adaption;
- ΔC(n+1)m
- Adaptionskontur: Werte der Adaptionskontur an der Position m für das
Metallband n+ 1
- C P (n + 1) m
- corrected or adapted profile contour of the n + 1'th metal band over the bandwidth m;
- C P (n + 1) m OA
- a calculated or predicted profile contour of the n + 1'th metal band over the bandwidth m without adaptation;
- .DELTA.C (n + 1) m
- Adaptation contour: values of the adaptation contour at the position m for the metal
strip n + 1
Bei der Breitenposition m kann es sich auch um Referenzpositionen bi handeln.The width position m may also be reference positions bi.
Die Differenz bzw. die Adaption ΔC(n)m zwischen gemessener und errechneter Korrektur wird bei dem in
Ohne Nutzung der Konturadaption kann es vorkommen, dass Bänder mit vermeintlich normalen Profilkonturen errechnet bzw. prognostiziert werden; siehe die gestrichelte Ausgangskontur nach dem ersten Rechenschritt ohne Konturadaption in
Alternativ oder ergänzend kann für die gleichen Bedingungen und die gleiche Profilkontur wie gemäß
Die Kenntnis der zu erwartenden Profilkontur aufgrund der physikalischen Modellierung der Zusammenhänge und der besagten adaptierten Profilkontur an mehreren Breitenpositionen bi über der Breite des Metallbandes wird weiterhin aktiv genutzt, um bei der Einstellung eines nominellen Bandprofils an der Bandkante, z. B. an der Position C25, zusätzlich auch das Bandprofil im Bandmittenbereich - ausgedrückt durch CBody bzw. C100 - in zulässigen minimalen und maximalen Grenzen C100min, C100max zu halten, wie dies für ein Beispiel in
Claims (24)
- Method for producing metal strips in a rolling installation with a desired profile contour, comprising the following steps:a) presetting a target value for the profile contour at at least one reference position bi in width direction for at least an nth metal strip;b) simulating a rolling process at the rolling installation for producing the metal strip with the aid of a process model, wherein setting values for profile setting elements and a prognosis value CP(n)bi for the profile contour of the nth metal strip at the reference position bi are so calculated that the target value is achieved as far as possible - sofar as present - with consideration of old adaptation values at the reference position bi and possible restrictions;c) setting the profile setting elements by the calculated setting values;d) rolling the nth metal strip;e) measuring the actual value Cist(n)bi of the profile contour of the rolled nth metal strip at the reference position bi; andf) determining a new adaptation value ΔC(n)bi on the basis of the difference between the actual value Cist(n)bi and the prognosis value CP(n)bi for the profile contour of the nth metal strip at the reference position bi;
characterised in that
the steps a), b) and c) are carried out before the rolling of the at least nth metal strip for a plurality I, wherein I ≥ 2, of reference positions bi, wherein 1 ≤ i ≤ I in at least one width section of the at least nth metal strip and that the steps e) and f) are carried out after rolling of the at least nth metal strip for the plurality I of reference positions bi in order to determine the new adaptation values ΔC(n)bi at the plurality I of the reference positions bi in the at least one width section of the at least nth metal strip; andg) during later production of a further longitudinal section of the nth metal strip or of an n + xth metal strip, wherein x = 1, 2, etc., at least the steps a) to d) are repeated, wherein n = n + x, wherein the new adaptation values ΔC(n)bi determined previously according to step f) at least for the nth metal strip are taken into account for the plurality I of the reference positions bi in the calculation of the settings of the profile setting elements and the calculation of the prognosis values according to step b) for the n + xth metal strip as old adaptation values. - Method according to claim 1, characterised by determination of the new adaptation values ΔC(n)bi according to step f) at the reference positions bi of the nth metal strip at least partly in the form of a short-term adaptation value ΔCK(n)bi according to the following formula:K: short-term adaptation;x=1,2,3...;ΔCK(n-x)bi: old short-term adaptation value;Cist(n)bi: measured actual value for the profile contour of the nth metal strip at the reference position bi; andCP(n)bi: calculated prognosis value or calculated strip profile.
- Method for producing metal strips in a rolling installation with a desired profile contour, comprising the following steps:a) presetting a target value for the profile contour at at least one reference position bi in width direction for at least an nth metal strip;b) simulating a rolling process at the rolling installation for producing the metal strip with the aid of a process model, wherein setting values for profile setting elements - sofar as present with configuration of old adaptation values at the reference position bi and possible restrictions - are so calculated that the target value is achieved as far as possible;c) setting the profile setting elements by the calculated adjustment values;d) rolling the nth metal strip;e) measuring the actual value Cist(n)bi of the profile contour of the rolled nth metal strip at the reference position bi;e') calculating a recalculated prognosis value C'P(n)bi for the profile contour of the nth metal strip at the reference position bi on the basis of the rolling installation conditions and current processing positions, such as they were present during rolling of the nth metal strip according to step d); andf) determining a new adaptation value ΔC(n)bi on the basis of the difference between the actual value Cist(n)bi and the recalculated prognosis value C'P(n)bi for the profile contour of the nth metal strip at the reference position bi;
characterised in that
the steps a), b) and c) are carried out before the rolling of the at least nth metal strip for a plurality I, wherein I ≥ 2, of reference positions bi, wherein 1 ≤ i ≤ I, in at least one width section of the at least nth metal strip and that the steps e), e') and f) are carried out after rolling of the at least nth metal strip for the plurality I of reference positions bi in order to determine the new adaptation values ΔC(n)bi at the plurality I of the reference positions bi in the at least one width section of the at least nth metal strip; andg) during later production of a further length section of the nth metal strip or of an n + xth metal strip, wherein x = 1, 2, etc., at least the steps a) to d) are repeated, wherein n = n + x, wherein the new adaptation values ΔC(n)bi determined previously according to step f) at least for the nth metal strip are taken into account for the plurality I of the reference positions bi in the calculation of the settings of the profile setting elements and in the calculation of the prognosis values according to step b) for the n + xth metal strip as old adaptation values. - Method according to claim 3,
characterised by
determination of the new adaptation values ΔC(n)bi according to step f) at the reference positions bi of the nth metal strip at least partly in the form of a short-term adaptation value ΔCK(n)bi according to the following formula:K: short-term adaptation,x=1, 2, 3 ...;ΔCK(n-x)bi: old short-term adaptation value;Cist(n)bi: measured actual value for the profile contour of the nth metal strip at the reference position bi; andCP(n)bi: recalculated prognosis value or recalculated strip profile. - Method according to any one of the preceding claims,
characterised by
determination of the new adaptation values ΔC(n)bi according to step f) in claim 1) or 3) at the reference positions bi at least partly in the form of long-term adaptation values ΔCLbi by carrying out the following steps:determining the adaptation values by repeating the steps a) to f) according to claim 1 or 3 at the plurality I of reference positions bi for a plurality of metal strips, which are rolled before the n + xth metal strip, of an adaptation group; andcalculating the long-term adaptation values ΔCLbi by formation of the mean values of the adaptation values or formation of the mean values of the differences between actual values and prognosis values for the profile contour for the plurality of metal strips in each instance at one of the reference positions bi. - Method according to claim 2, 4 and 5,
characterised by
determination of the adaptation values ΔC(n)bi according to step f) each time in the form of the sum adaptation value ΔCs(n)bi as a sum of the short-term adaptation value ΔCK(n)bi and the long-term adaptation value ΔCLbi for use for the metal strip n + x. - Method according to any one of claims 2, 4, 5 and 6,
characterised by
determination of the adaptation value ΔC(n)bi according to step f) and/or use of the adaptation value ΔC(n)bi in the form of a short-term adaptation value, long-term adaptation value or sum adaptation value, the value being weighted by a weighting factor g, wherein 0 ≤ g ≤ 1, or by a weighting function. - Method according to any one of the preceding claims,
characterised by
determination of an adaptation contour ΔC(n+ x)m for the n + xth metal strip in the form of a set-up function, which is preferably conducted by the adaptation values, which are determined at the at least nth metal strip, at at least two of the reference positions bi and preferably additionally by at least one further calculation point - calculated/predetermined by the process model - at at least one further strip width position m. - Method according to claim 8,
characterised by
determination of an adapted profile contour CP(n + x)m for the n + xth metal strip by the addition of a non-adapted calculated profile contour CP(n+x)moA - forecast by the process model - for the n + xth metal strip and the calculated adaptation contour ΔC(n+x)m for the n + xth metal strip. - Method according to claim 8 or 9,
characterised in that
determination of the adaptation contour or of the adapted profile contour for ≥ 2 width sections of the metal strip is carried out, wherein the first width section of the metal strip lies in, for example, the central region and the second width section or further width sections lies or lie in, for example, the edge region of the metal strip. - Method according to claim 34,
characterised in that
in the case of two sections adjoining one another in width direction the adaptation contour or the adapted profile contour over the two width sections is preferably selected so that the contour courses can be continuously differentiated at the boundary of one strip section to the other strip section, in particular so that they have the same gradients. - Method according to one of claims 10 and 11,
characterised in that
the set-up function is formed over at least one of the width sections from a linear function, a polynomial function, an exponential function, a trigonometric function, a spline function or a combination of different functions. - Method according to claim 12, characterised in that the set-up functions are different for the different adjacent width sections.
- Method according to claim 8 or 9,
characterised in that
the adaptation contour or the adapted profile contour over one width section of the metal strip is extrapolated to an adjacent width section for determination of an extrapolated adaptation contour or an extrapolated adapted profile contour over the adjacent width region. - Method according to any one of the preceding claims,
characterised in that
instead of the measured actual value Cist(n)bi of the profile contour of the metal strip at the reference position bi a mean value from the measured actual values at the mirror-image reference positions bi on the righthand half and lefthand half of the metal strip seen in rolling direction is used. - Method according to one of claims 1 and 9,
characterised in that
the prognosis values CP(n + x)bi or/and the adapted profile contour CP(n + x)m is or are initially determined for only one strip half, for example the strip half on the control side, and subsequently mirrored for the other strip half, for example the strip half on the drive side, at the strip centre plane extending in longitudinal direction of the metal strip. - Method according to any one of the preceding claims,
characterised in that
the measured actual value Cist(n)bi of the profile contour is used as a direct measured value at the reference position bi or as a profile measurement value smoothed by an equalising function. - Method according to any one of claims 9 to 17,
characterised in that
the adapted profile contour CP(n+x)m is analysed with respect to profile anomalies, such as strip beads or steep edge drops, particularly in the edge region of the metal strip. - Method according to claim 18,
characterised in that
when calculated strip beads are present the adapted profile contour CP(n+x)m is iteratively improved by means of the process model by successively increasing a value of the profile contour at at least one of the reference positions bi within the scope of the allowable profile setting limits and by appropriate resetting of the profile setting elements in order to reduce the height of the strip bead. - Method according to claim 18,
characterised in that
calculated strip beads are reduced or avoided by increasing the load in the last roll stand (run-out stand) or the last roll stands of a rolling train or in the last rolling passes of a stand of the rolling installation by redistributing the load from the front to the rear or by deselecting at least one roll stand or rolling pass within the scope of the processing and installation limits. - Method according to any one of the preceding claims,
characterised in that for production of the n + xth metal strip:the profile setting elements are so set in step b) that the target values predetermined for a plurality of reference positions bi or calculated prognosis values CP(n + x)bi for the profile contour are achieved within allowable minimum or maximum profile limits; orthe profile setting elements are so set in step b) that the target value predetermined for a reference position bi is achieved or the deviation from the target value is minimal and at the same time the strip profile is maintained at at least one further strip width position within allowable minimum or maximum profile limits. - Method according to any one of the preceding claims,
characterised in that
the determined adaptation values at the positions bi and/or the adapted profile contour and/or the adaptation contour in the process model is or are taken into account - particularly transferred to the preceding rolling passes or stands with weighting factors or transfer functions - for calculation of the intermediate stand contours or intermediate pass contours of the front stands or the preceding passes and for optimised adjustment of the profile setting elements. - Method according to any one of the preceding claims,
characterised in that
the reference position bi is defined by way of its spacing from the edge of the metal strip. - Method according to any one of the preceding claims,
characterised in that
for the setting of the target contour, with use of the strip contour adaptation, the following profile setting elements are employed: variable working roll cooling systems or zonal cooling means or local roll heating means for influencing the thermal crown and/or working roll displacements in conjunction with roll grinding (special roll grinds for combatting strip beads or strip edge drops, "tapered roll", CVC rolls, CVC rolls with a grind of higher order or polynomial nth order or trigonometric functions), strip edge heating means, strip zone cooling means, working roll bending means and/or stands with a roll pair cross function.
Applications Claiming Priority (2)
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DE102015204700 | 2015-03-16 | ||
PCT/EP2016/055525 WO2016146621A1 (en) | 2015-03-16 | 2016-03-15 | Method for producing metal strips |
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EP3271092A1 EP3271092A1 (en) | 2018-01-24 |
EP3271092B1 true EP3271092B1 (en) | 2019-06-19 |
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EP16709931.6A Active EP3271092B1 (en) | 2015-03-16 | 2016-03-15 | Method for producing metal strips |
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US (1) | US10625317B2 (en) |
EP (1) | EP3271092B1 (en) |
JP (1) | JP6704925B2 (en) |
KR (1) | KR102122217B1 (en) |
CN (1) | CN107530748B (en) |
RU (1) | RU2690580C2 (en) |
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EP3479916A1 (en) | 2017-11-06 | 2019-05-08 | Primetals Technologies Germany GmbH | Selected adjustment of contour by setting specifications |
DE102018212074A1 (en) * | 2018-07-19 | 2020-01-23 | Sms Group Gmbh | Method for determining manipulated variables for active profile and flatness actuators for a roll stand and for profile and central flatness values for hot-rolled metal strip |
CN109871590B (en) * | 2019-01-23 | 2020-11-06 | 燕山大学 | Hot rolled strip section profile reproduction method |
EP3917694B1 (en) | 2019-01-28 | 2023-08-09 | Primetals Technologies Germany GmbH | Local varying of the roll gap in the area of the edges of a rolled strip |
CN110434172B (en) * | 2019-07-16 | 2020-05-08 | 北京科技大学 | Load distribution calculation method for continuous rolling of furnace coil and finishing mill group |
EP3943210A1 (en) * | 2020-07-23 | 2022-01-26 | Primetals Technologies Austria GmbH | Casting rolling composite system for the production of a hot rolled strip from a steel melt |
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US20180056349A1 (en) | 2018-03-01 |
KR102122217B1 (en) | 2020-06-12 |
WO2016146621A1 (en) | 2016-09-22 |
CN107530748B (en) | 2019-11-05 |
JP2018511483A (en) | 2018-04-26 |
KR20170117147A (en) | 2017-10-20 |
US10625317B2 (en) | 2020-04-21 |
RU2017129842A3 (en) | 2019-04-16 |
TWI627001B (en) | 2018-06-21 |
JP6704925B2 (en) | 2020-06-03 |
TW201641171A (en) | 2016-12-01 |
RU2690580C2 (en) | 2019-06-04 |
EP3271092A1 (en) | 2018-01-24 |
RU2017129842A (en) | 2019-04-16 |
CN107530748A (en) | 2018-01-02 |
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