EP4176985B1 - Procédé de prédiction d'une situation d'apparition imminente d'une bande laminée dans un train de laminage - Google Patents

Procédé de prédiction d'une situation d'apparition imminente d'une bande laminée dans un train de laminage Download PDF

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Publication number
EP4176985B1
EP4176985B1 EP22201775.8A EP22201775A EP4176985B1 EP 4176985 B1 EP4176985 B1 EP 4176985B1 EP 22201775 A EP22201775 A EP 22201775A EP 4176985 B1 EP4176985 B1 EP 4176985B1
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Prior art keywords
strip
point
roll stand
looper
speed
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German (de)
English (en)
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EP4176985A1 (fr
Inventor
Julian Belz
Matthias Tuschhoff
Markus Koch
Christian Mengel
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SMS Group GmbH
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SMS Group GmbH
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Priority claimed from DE102021214588.4A external-priority patent/DE102021214588A1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B41/00—Guiding, conveying, or accumulating easily-flexible work, e.g. wire, sheet metal bands, in loops or curves; Loop lifters
    • B21B41/08—Guiding, conveying, or accumulating easily-flexible work, e.g. wire, sheet metal bands, in loops or curves; Loop lifters without overall change in the general direction of movement of the work
    • B21B41/10—Loop deflectors
    • 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
    • B21B37/48—Tension control; Compression control
    • B21B37/50—Tension control; Compression control by looper control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product

Definitions

  • the invention relates to a method and a computer program product for predicting an impending breakout situation (or an impending "rise”) of a rolled strip, in particular a metal strip, between a first and a subsequent second rolling stand of a rolling train with a looper installed between the two rolling stands .
  • [5] refers to the evaluation of a belt control system, but not to the evaluation of the mass flow.
  • [6] is considered the closest state of the art and shows a method for predicting an impending breakout situation of a rolled strip, using historical values or based on recorded strip parameters such as thickness, a width, a thickness profile, a flatness , a temperature or the like.
  • first roll stand and second roll stand do not indicate the positions of the roll stands within the rolling train. On the contrary, the terms first/second roll stand are only used to distinguish two successive active roll stands, which can be located at any position i, i+1 within the rolling line.
  • the active rolling stands exert a force on the strip, regardless of any intermediate passive/inactive rolling stands that do not exert a force on the strip.
  • tape storage length means an (additional) tape length that is stored in a tape storage, here the looper, in particular between two successive roll stands.
  • breakout means a storage situation for a rolled strip in front of a rolling stand, whereby the rolled strip leaves the horizontal fitting line between two successive rolling stands and goes into the vertical, i.e. H. moves up or down.
  • the order of the two calculation steps is not important. Their order can be changed, or the two calculation steps can be performed simultaneously.
  • the claimed method is generally used to assess the stability of a rolling process.
  • the claimed method which is also referred to below as the physical model according to the invention, requires process data from the finishing train as well as data on the kinematics of the loop lifter.
  • the necessary information includes: the thickness of the metal strip, speeds of the main drives, loop lifter angles and the lever arms of the loop lifters.
  • the early detection of unavoidable rolling breaks through the claimed method makes it possible to minimize the resulting downtimes of the finishing rolling line or at least of the individual roll stand in question.
  • the timely completion of the rolling process leads to a reduction in the scrap to be removed in the area of the intermediate stand and to a possible reduction in the risk of damage to system components within the finishing rolling mill. This means time-consuming and costly repair work can be avoided.
  • the exit speed and/or the entry speed of the belt is measured with a sensor or determined as an estimate thereof.
  • the application of the method according to the invention provides the operator of a finish rolling line with suitable diagrams and key figures that support the monitoring of the mass flow status of the entire finish rolling plant.
  • These diagrams and key figures consolidate information from all subsystems involved in the mass flow and are able to indicate the intermediate stand area within the rolling train, especially a finishing rolling train, where a problem is emerging. In addition to an indication of unavoidable rolling breaks, the operator is also informed about an increased potential for danger.
  • FIG. 1 shows a looper kinematics with a looper 10 between two rolling stands Fi, Fi+1 and important geometric dimensions.
  • the points P, E and Q are in Figure 1 shown.
  • the integration begins, for example, 300 ms after the signal "strip in stand" Fi+1, denoted here by t0, and ends when the strip leaves the roll stand Fi, denoted by t1.
  • the tape entry and exit speeds are calculated using advance setup values.
  • the strip exit thicknesses of the rolling stands Fi and Fi+1 are also used to calculate the strip entry speed. Alternatively, the belt speeds can also be measured.
  • the first way provides details of a visual approach. By plotting the two values for the tape lengths Dskin and Dsint against each other, a so-called correlation diagram is created. This diagram provides a quick visual assessment of mass flow conditions.
  • the second option which is described in the following section 2.2, is the calculation of the so-called mass flow evaluation values (MFAV). This quantitative measure summarizes all available information about the mass flow between two consecutive rolling stands and can be used to create alerts to direct the operator's attention to the right location.
  • MFAV mass flow evaluation values
  • the information coming from different sensors the information about the looper kinematics and the lead value (either estimated or measured) are combined to obtain a single correlation diagram. Tracking all of this information for up to six stand intermediate areas in a rolling train is quite impossible for a single operator to do so explicitly. In contrast, the use of six correlation diagrams according to the invention appears to be manageable.
  • the Figures 3 and 4 show the two calculated tape storage lengths (Axis 1), the actual and target looper angles (Axis 2), the signals indicating "tape in the framework" for Fi and Fi+1 (Axis 3), and the correlation diagram of Ds kin . against Ds int. (Axis 4). Both figures show signals from one and the same band with low-frequency, high-amplitude loop oscillations.
  • the correlation curve in axis 4 could be of Fig. 3 can be (mis)interpreted as an indication of an impending outbreak situation, which would be wrong here.
  • the application of the bandpass filter helps to merge the two lengths of tape storage.
  • the correlation plot in axis 4 of Figure 4 shows all data points for the entire time range. It can be seen that the data is relatively close to the gray line (angle bisector) with slope 1, indicating a positive Correlation between the two strip material lengths indicates. “Close” to the gray line means that the data points lie within an ⁇ neighborhood around the bisector.
  • the lower and upper limit frequency of the bandpass is e.g. B. 0.5 or 25 Hz.
  • the points for the entire time range are recorded at once. Therefore, in some cases it may be difficult to distinguish the breakout situation from the successfully wrapped strip. The reason for this may be that the selected time interval is too long. If the correlation diagram is only for a short time interval, e.g. B. the last five seconds, problems with the mass flow become visible, see Fig. 5 . At this point in time, the drawn points line up vertically and exceed the ⁇ -environment around the bisector. In this case, an impending outbreak situation can be expected.
  • the correlation diagrams explained in Section 2.1 form the basis for the MFAV calculation.
  • the vertical distance of each point in the correlation diagram to the angle bisector is calculated.
  • the mean value preferably the arithmetic mean value of all these distances, is then calculates and gives the MFAV.
  • Settings that can be used to customize the MFAV calculation include the amount of time (duration) that is taken into account and the update time (how much time there is between updating the MFAV).
  • Reasonable limits for MFAV must be established at which warnings are displayed to the operator. Specific values for these limits must be established for each facility.
  • Fig. 6 and 7 the time course of the mass flow evaluation values for the various intermediate areas between the rolling stands F1 ... F7 of a (finishing) rolling train is shown.
  • the mass flow assessment value does not exceed the respective limit value, also called the MFAV threshold value, in any intermediate range at any time.

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

Claims (13)

  1. Procédé de prédiction d'une situation d'éclatement imminent d'une bande laminée, en particulier d'une bande métallique, entre une première cage de laminoir et une seconde cage de laminoir suivante (Fi, Fi+1) d'un train de laminage avec un boucleur installée entre les deux cages de laminoir, comprenant les étapes consistant à :
    a) calculer une première longueur de stockage de bande sur la base de l'angle du boucleur et de la cinématique du boucleur ;
    b) calculer une seconde longueur de stockage de bande sur la base d'une intégration de la différence de vitesse de la bande entre la vitesse de la bande à la sortie de la première cage de laminoir et la vitesse de la bande à l'entrée de la seconde cage de laminoir ;
    c) comparer les résultats des étapes a) et b) et évaluer les écarts entre ces deux longueurs de stockage de bande afin d'indiquer une situation d'éclatement imminente.
  2. Procédé selon la revendication 1, caractérisé en ce que la première longueur de stockage de bande est calculée selon l'équation suivante : D s kin . = PE ‾ + EQ ‾ − PQ ‾
    Figure imgb0010
     où
    PE = distance euclidienne entre le point de sortie (P) de la bande de la première cage de laminoir (Fi) et le point de contact (E) de la bande avec la roulette du boucleur ;
    EQ = distance euclidienne entre le point de contact (E) de la bande avec le boucleur et le point d'entrée (Q) de la bande dans la seconde cage de laminoir (Fi+1) ;
    PQ = distance euclidienne entre le point de sortie (P) de la bande de Fi et le point d'entrée (Q) de la bande dans la seconde cage de laminoir (Fi+1).
  3. Procédé selon la revendication 2, caractérisé en ce que la première longueur de stockage de bande (Dskin.) est déterminée au moyen d'un procédé d'imagerie basé sur une caméra orientée vers l'espace entre les cages de laminoir.
  4. Procédé selon la revendication 3, caractérisé en ce que le procédé d'imagerie comprend des procédés de reconnaissance d'objets et d'images, qui reposent éventuellement sur des méthodes d'intelligence artificielle et/ou des évaluations statistiques.
  5. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la seconde longueur de stockage de bande est calculée selon l'équation suivante : D s int . = ∫ t 0 t 1 v x − v e dt .
    Figure imgb0011
     où
    vx = vitesse de sortie de la bande de la première cage de laminoir ; et
    ve = vitesse d'entrée de la bande dans la seconde cage de laminoir.
  6. Procédé selon la revendication 5,
    caractérisé en ce qu'un filtrage passe-bande de la différence de vitesse vx-ve ou du résultat de l'intégrale ∫ t 0 t 1 v x − v e dt
    Figure imgb0012
     est effectué selon la formule (3).
  7. Procédé selon la revendication 6, caractérisé en ce que les fréquences de coupure du passe-bande sont choisies de telle sorte qu'elles soient, par exemple de 0,5 Hz (fréquence de coupure inférieure) et 25 Hz (fréquence de coupure supérieure).
  8. Procédé selon l'une des revendications 5 à 7, caractérisé en ce que la vitesse de sortie et/ou la vitesse d'entrée sont mesurées par un capteur ou déterminées comme une estimation de l'avance.
  9. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'évaluation de l'écart entre les premières et secondes longueurs de stockage de bande est effectuée en appliquant les premières et secondes longueurs de stockage de bande l'une par rapport à l'autre dans un diagramme de corrélation, la corrélation étant représentée à un moment discret par un point unique dans le diagramme de corrélation ; et
    le point unique est utilisé comme indicateur de la situation d'éclatement imminent s'il se trouve suffisamment à l'extérieur d'une bissectrice pour qu'une valeur seuil prédéterminée soit dépassée.
  10. Procédé selon la revendication 9,
    caractérisé en ce que l'étape de détermination de la corrélation est répétée pour une pluralité de points temporels discrets dans une période de temps
    donnée afin d'obtenir une pluralité de points individuels dans le graphique de corrélation ; et
    caractérisé par l'utilisation de la pluralité de points individuels comme indicateur de la situation d'éclatement imminent, lorsque la pluralité de points individuels s'écarte sensiblement de la bissectrice, de sorte que la valeur seuil prédéterminée est dépassée.
  11. Procédé selon la revendication 10, caractérisé par les étapes consistant à calculer toute mesure de distance entre chaque point de la courbe de corrélation et la bissectrice, par exemple la distance perpendiculaire ;
    calculer une valeur moyenne, de préférence la moyenne arithmétique, de toutes ces distances, ce qui donne une valeur d'évaluation de débit massique MFAV qui évalue l'écart entre les première et seconde longueurs de stockage de bande ; et
    utiliser la MFAV comme indicateur de la situation d'éclatement imminent lorsque la MFAV dépasse une valeur de seuil de MFAV représentée par une valeur pour la MFAV.
  12. Procédé selon les revendications 9 ou 10, caractérisé en ce que la valeur de seuil est représentée par un certain environnement ε autour de la bissectrice dans le diagramme de corrélation ; et
    ledit au moins un point individuel dans le graphique de corrélation est utilisé comme indicateur de la situation d'éclatement imminent lorsque le point individuel ou une majorité des points individuels se trouve en dehors de l'environnement ε.
  13. Produit de programme informatique pouvant être chargé directement dans la mémoire interne d'un ordinateur et comprenant des sections de code logiciel pour l'exécution des étapes du procédé selon l'une quelconque des revendications précédentes lorsque le produit de programme informatique est exécuté sur l'ordinateur.
EP22201775.8A 2021-11-08 2022-10-17 Procédé de prédiction d'une situation d'apparition imminente d'une bande laminée dans un train de laminage Active EP4176985B1 (fr)

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DE102021212512 2021-11-08
DE102021214588.4A DE102021214588A1 (de) 2021-11-08 2021-12-17 Verfahren zur Vorhersage einer bevorstehenden Ausbruch-Situation eines gewalzten Bandes in einer Walzstrasse

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CN116652526B (zh) * 2023-05-23 2026-02-13 广西广盛新材料科技有限公司 金属卷材加工方法、装置、设备及介质

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DE102009053859A1 (de) * 2009-11-19 2011-05-26 Sms Siemag Aktiengesellschaft Schlingenheber
DE102020205120A1 (de) * 2020-04-22 2021-10-28 Sms Group Gmbh Verfahren zum Betreiben einer Metallbandbearbeitungsanlage sowie Metallbandbearbeitungsanlage

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