EP3271092B1 - Verfahren zum herstellen von metallbändern - Google Patents

Verfahren zum herstellen von metallbändern Download PDF

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Publication number
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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Prior art keywords
metal strip
profile
adaptation
contour
values
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German (de)
English (en)
French (fr)
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EP3271092A1 (de
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Jürgen Seidel
Uwe BAUMGÄRTEL
Ralf Wachsmann
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SMS Group GmbH
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SMS Group GmbH
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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.
EP16709931.6A 2015-03-16 2016-03-15 Verfahren zum herstellen von metallbändern Active EP3271092B1 (de)

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DE102015204700 2015-03-16
PCT/EP2016/055525 WO2016146621A1 (de) 2015-03-16 2016-03-15 Verfahren zum herstellen von metallbändern

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EP (1) EP3271092B1 (zh)
JP (1) JP6704925B2 (zh)
KR (1) KR102122217B1 (zh)
CN (1) CN107530748B (zh)
RU (1) RU2690580C2 (zh)
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WO (1) WO2016146621A1 (zh)

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DE102018212074A1 (de) * 2018-07-19 2020-01-23 Sms Group Gmbh Verfahren zum Ermitteln von Stellgrößen für aktive Profil- und Planheitsstellglieder für ein Walzgerüst und von Profil- und Mittenplanheitswerten für warmgewalztes Metallband
CN109871590B (zh) * 2019-01-23 2020-11-06 燕山大学 一种热轧带材断面轮廓复现方法
CN110434172B (zh) * 2019-07-16 2020-05-08 北京科技大学 一种炉卷和精轧机组连轧的负荷分配计算方法
EP3943210A1 (de) * 2020-07-23 2022-01-26 Primetals Technologies Austria GmbH Giess-walz-verbundanlage zur herstellung eines warmgewalzten fertigbands aus einer stahlschmelze

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US20180056349A1 (en) 2018-03-01
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CN107530748B (zh) 2019-11-05
TW201641171A (zh) 2016-12-01
JP2018511483A (ja) 2018-04-26
EP3271092A1 (de) 2018-01-24
JP6704925B2 (ja) 2020-06-03
WO2016146621A1 (de) 2016-09-22
RU2017129842A3 (zh) 2019-04-16
CN107530748A (zh) 2018-01-02
RU2017129842A (ru) 2019-04-16
RU2690580C2 (ru) 2019-06-04
TWI627001B (zh) 2018-06-21

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