EP1812181B1 - Procede et programme informatique pour la commande d'une operation de laminage - Google Patents

Procede et programme informatique pour la commande d'une operation de laminage Download PDF

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Publication number
EP1812181B1
EP1812181B1 EP06829190A EP06829190A EP1812181B1 EP 1812181 B1 EP1812181 B1 EP 1812181B1 EP 06829190 A EP06829190 A EP 06829190A EP 06829190 A EP06829190 A EP 06829190A EP 1812181 B1 EP1812181 B1 EP 1812181B1
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Prior art keywords
neutral point
strip
rolling process
metal strip
roll
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EP06829190A
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German (de)
English (en)
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EP1812181A1 (fr
Inventor
Hartmut Pawelski
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SMS Siemag AG
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SMS Siemag AG
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/02—Transverse dimensions
    • B21B2261/04—Thickness, gauge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/02—Tension
    • B21B2265/04—Front or inlet tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/20—Slip
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2267/00—Roll parameters
    • B21B2267/10—Roughness of roll surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/02—Speed
    • B21B2275/04—Roll speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/06—Lubricating, cooling or heating rolls
    • B21B27/10—Lubricating, cooling or heating rolls externally
    • 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
    • B21B38/04—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product
    • 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
    • B21B38/06—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring tension or compression
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0239—Lubricating
    • B21B45/0245—Lubricating devices
    • B21B45/0248—Lubricating devices using liquid lubricants, e.g. for sections, for tubes
    • B21B45/0251—Lubricating devices using liquid lubricants, e.g. for sections, for tubes for strips, sheets, or plates

Definitions

  • the invention relates to a method and a computer program for controlling a rolling process, in which a metal strip is flat-rolled by means of at least two rolls.
  • the invention basically relates to all types of rolling processes, such as cold rolling, hot rolling or finish rolling; however, it finds favored use in quay rolling processes.
  • the calculation of the position of the neutral point is only trivial for ideal plastic material and can only be determined for such materials from measurable parameters of the rolling process.
  • the use of the traditionally calculated (relative) position of the neutral point as a criterion for the stability of a rolling process is therefore only possible to a limited extent in non-ideal plastic material, that is to say in particular in the case of elastic-plastic material, such as real metals.
  • the reason for this is that the (relative) position of the neutral point for rolling processes of real metals with the help of measurable rolling parameters can traditionally only be determined quite inaccurately.
  • the invention has the object, a known method and computer program for controlling a rolling process in accordance with the relative position of the neutral point between a roller and a metal strip to be rolled in view of the real behavior of the metal strip during the rolling process TO IMPROVE.
  • the relative position of the neutral point can be calculated much more precisely, that is more realistic and more accurate, than has been the case in the past. This is especially true because with the consideration of the hydrostatic pressure, the volume compression of the metal strip during the rolling process is included in the calculation of the position of the neutral point. In addition, the springback of the band is considered after passing through the narrowest point of the roll gap. This consideration is especially important for values of the zero lead parameter.
  • the present invention more realistic information about the actual position of the neutral point allows a control device or an operator who observes or controls the rolling process, faster and Intervene more efficiently in the rolling process to ensure its stability.
  • the parameters yield stress and hydrostatic pressure in the neutral point are required for more precise calculation of the relative position of the neutral point, but are not easily measurable as measurement parameters during the rolling process, they are inventively using a mathematical model, which can be individually adapted to each individual rolling process is, simulated and preferably calculated in real time to be available in time for the calculation of the real position of the neutral point.
  • a mathematical model which can be individually adapted to each individual rolling process is, simulated and preferably calculated in real time to be available in time for the calculation of the real position of the neutral point.
  • process parameters which can be measured during the rolling process are used as the input variable for the mathematical model.
  • the rolling process is considered stable when the calculated value ⁇ for the relative position of the neutral point is between a lower threshold of about 0.12 and an upper threshold of about 0.4. If the value ⁇ is below the lower threshold, this is an indication that the rolling process is unstable; he is then by appropriate measures, such as increasing the strip tension at the exit, to stabilize a reduction of the strip tension at the entrance or an increase in the friction in the nip again.
  • the relative position of the neutral point calculated according to the invention is preferably stored over its passage of time. Regardless of this, it is advantageous for rapid initiation of measures to stabilize the rolling process or for removal of excessively high frictional forces in the nip if the relative position of the neutral point calculated according to the invention is illustrated on a display device, preferably in real time, for an operator.
  • the above object of the invention is further achieved by a computer program for a control device for controlling a rolling process according to the method described above.
  • FIG. 1 shows a rolling stand with a pair of rollers, in which the rollers 200 are arranged vertically one above the other and wherein between the two rollers 200, a roll gap is formed.
  • a metal strip 100 is pushed through the nip while being flat-rolled.
  • Both the upper and the lower (working) roller 200 touches the metal strip 100 in a contact arc, which is represented in the upper roller 200 by the arc length of the angle ⁇ .
  • the neutral point is denoted by the reference numeral N by way of example.
  • the neutral point indicates the position on the circumference of a roller at which the peripheral speed the roller coincides with the speed of the rolled material, in particular the rolled metal strip.
  • the material flow direction is in FIG. 1 indicated by the horizontal arrows; it runs from left to right there.
  • the parameter R denotes the radius of the roller 200
  • the parameter v E denotes the speed of the metal strip 100 at the entrance of the roll gap
  • the parameter v A denotes the speed of the metal strip at the exit of the roll gap
  • the parameter v N denotes the speed of the metal strip 100 Height of the neutral point N. All others in FIG. 1 shown parameters are explained in more detail below.
  • An assessment of the stability of a rolling process and a decision to initiate measures to stabilize the rolling process can be made the more accurate the closer or closer to reality the current position of the neutral point is known.
  • the calculation of the relative position ⁇ of the neutral point takes place in FIG. 2 in block A.
  • the above parameters used in the calculation of ⁇ are in FIG. 2 also shown. From these parameters form the lead f slip , the height h E of the metal strip at the entrance of the nip, the height h A at the exit of the nip and the belt tension ⁇ A at the exit of the nip a first group of mitparametem, which at any time during a rolling process directly measurable are.
  • the flat elastic modulus E * of the metal strip 100 and the compressibility K of the metal strip are known in principle.
  • the values required for the calculation according to the invention of the relative position ⁇ of the neutral point for the plane yield stress k e and the pressure p N H in the roll gap in the neutral point are perpendicular, ie normal to the metal band. Because the latter two parameters are not directly measurable, they are estimated according to the invention on the basis of the first group of parameters and on the basis of a second group of parameters, using a mathematical model for the individual rolling process.
  • the second group of process parameters comprises the strip input voltage ⁇ E at the entrance of the roll gap, the roll force F, the width of the metal strip b, the radius R 0 of the (working) roll 200 and the flat elastic modulus E * R of the roll.
  • the process parameters of the second group can also be measured individually during a rolling process so that the sought values for the plane yield stress k e and for the pressure p N H in the nip in the neutral point perpendicular to the metal strip can be calculated solely from measurable parameters.
  • the calculation is preferably carried out in real time so that the values for ⁇ are as up-to-date as possible, in order to enable a targeted and effective intervention in the rolling process, if necessary.
  • FIG. 3 For example, various ranges for possible relative positions ⁇ of the neutral point in the nip between the two rollers 200 are illustrated.
  • a hatched area is identified, which is limited by a lower threshold value of approx. 0.12 and an upper threshold value of 0.4 for the value of ⁇ . If ⁇ is in the shaded area, that is, in terms of value between the upper and lower threshold, then the rolling process is classified as stable; then no measures need to be taken to intervene stabilizing in the rolling process.
  • a stabilization of the rolling process can be achieved by increasing the strip tension ⁇ A at the exit of the roll gap, by reducing the strip tension ⁇ E at the entrance of the roll gap and / or by increasing the friction in the roll gap.
  • the latter can be achieved, for example, by increasing the roughness of the roller 200, be achieved by reducing the amount of lubricant and / or by reducing the rolling speed.
  • a remedy here can be appropriate measures, such as a reduction of the strip tension ⁇ A at the exit of the roll gap, an increase of the strip tension ⁇ E at the entrance of the roll gap and / or a reduction of the friction between roll 200 and metal strip 100.
  • a reduction in friction can be realized by reducing the roughness of the roll, by increasing the amount of lubricant and / or by increasing the rolling speed.
  • the measures referred to in this paragraph may also be used individually or in combination, depending on the intensity required.
  • the measures just discussed may be initiated either automatically or by an operator according to the calculated value for the neutral point position ⁇ . If the intervention is to be initiated by an operator, it is helpful if the respective current position of the neutral point in a representation similar to FIG. 3 is visualized for the operator on a display device. The operator can then immediately recognize on the basis of the illustrated current position ⁇ of the neutral point, whether the rolling process is currently stable, unstable or unstable and, depending on appropriate cause appropriate measures.
  • the inventive calculation of the value ⁇ for the neutral position of the point is realized in a computer program for a control device for controlling a rolling process.

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

Claims (8)

  1. Procédé pour commander un processus de laminage, dans lequel une bande de métal (100) est laminée à plat à l'aide d'au moins un cylindre (200), comprenant les étapes suivantes :
    détection de la position relative (N) du point neutre dans un arc de contact entre la bande de métal (100) et le cylindre (200) ; et si nécessaire, stabilisation du processus de laminage en fonction de la position ξ (N) du point neutre par intervention avec des mesures techniques appropriées dans le processus de laminage ;
    caractérisé en ce que
    l'amplitude de la contrainte d'écoulement à plat ke de la bande de métal et l'amplitude de la pression hydrostatique pN H au point neutre sont estimées à titre de paramètres de processus qui ne sont pas directement mesurables respectivement à l'aide d'un modèle mathématique pour le processus de laminage individuel en se basant sur un premier groupe et un second groupe de paramètres de processus mesurables, le premier groupe comprenant les paramètres que sont l'avance fslip, l'épaisseur de la bande à l'entrée hE, l'épaisseur de la bande à la sortie hA, et la contrainte de sortie σA de la bande de métal (100), et le second groupe comprenant la contrainte d'entrée σE de la bande, la force de laminage F, la largeur de bande b, le rayon R0 du cylindre, et le module d'élasticité plan E*R du cylindre ; et
    la position relative ξ (N) du point neutre est calculée en se basant sur les valeurs estimées pour la contrainte d'écoulement à plat ke et la pression hydrostatique pN H, en se basant sur le premier groupe de paramètres de processus mesurables ainsi qu'en se basant sur le module d'élasticité plan E* de la bande de métal et sur la compressibilité K de la bande de métal.
  2. Procédé selon la revendication 1,
    caractérisé en ce que la position relative du point neutre ξ est calculée d'après la formule suivante : ξ = f slip + 1 ⁢ 1 - σ A 3 ⁢ K - p N + q N 2 ⁢ K + k e - σ A E * - 1 h E / h A ⁢ 1 + k e - σ A E * - 1
    Figure imgb0005
    dans laquelle
    fslip représente l'avance;
    σA représente la contrainte de la bande à la sortie
    K représente la compressibilité de la bande de métal (100);
    pN représente la pression dans l'emprise de laminage au point neutre, perpendiculairement (normale) à la bande de métal ;
    qN représente la pression dans l'emprise de laminage au point neutre en direction longitudinale de la bande de métal ;
    ke représente la contrainte d'écoulement à plat ;
    E* représente le module d'élasticité à plat de la bande de métal (100) ;
    hE représente l'épaisseur de la bande à l'entrée ; et
    hA représente l'épaisseur de la bande à la sortie.
  3. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que le processus de laminage se déroule de manière stable et aucune intervention de stabilisation avec des mesures techniques appropriées n'est nécessaire quand la valeur calculée ξ pour la position relative (N) du point neutre est située entre une valeur seuil inférieure d'environ 0,12 et une valeur seuil supérieure d'environ 0,40.
  4. Procédé selon l'une des revendications 1 ou 2,
    caractérisé en ce que le processus de laminage est stabilisé par des mesures techniques appropriées, comme l'augmentation de la traction de la bande à la sortie, la réduction de la traction de la bande à l'entrée ou l'augmentation de la friction dans l'emprise de laminage, par exemple par augmentation de la rugosité du cylindre, réduction de la quantité de lubrifiant et/ou réduction de la vitesse de laminage, quand la valeur ξ pour la position relative du point neutre est située entre zéro et une valeur seuil inférieure d'environ 0,12.
  5. Procédé selon l'une des revendications 1 ou 2,
    caractérisé en ce que le processus de laminage est amélioré par des mesures techniques appropriées, comme la réduction de la traction de la bande à la sortie, l'augmentation de la traction de la bande à l'entrée, ou la réduction de la friction, par exemple par réduction de la rugosité du cylindre, par augmentation de la quantité de lubrifiant et/ou augmentation de la vitesse de laminage, quand la valeur ξ pour la position relative du point neutre est située au-dessus d'une valeur seuil supérieure d'environ 0,4.
  6. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que la stabilisation du processus de laminage a lieu en fonction de la position calculée du point neutre, automatiquement ou en raison d'une intervention d'un opérateur dans le processus de laminage.
  7. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que la position relative calculée (N) du point neutre est de préférence mémorisée dans son évolution temporelle et/ou représentée sur un dispositif d'affichage, de préférence en temps réel, pour un opérateur.
  8. Programme d'ordinateur pour un dispositif de commande destiné à commander un processus de laminage,
    caractérisé en ce que le programme d'ordinateur est conçu pour mettre en oeuvre le procédé selon l'une des revendications précédentes.
EP06829190A 2005-12-14 2006-11-30 Procede et programme informatique pour la commande d'une operation de laminage Active EP1812181B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005059653A DE102005059653A1 (de) 2005-12-14 2005-12-14 Verfahren und Computerprogramm zum Steuern eines Walzprozesses
PCT/EP2006/011486 WO2007068359A1 (fr) 2005-12-14 2006-11-30 Procede et programme informatique pour la commande d'une operation de laminage

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EP1812181A1 EP1812181A1 (fr) 2007-08-01
EP1812181B1 true EP1812181B1 (fr) 2009-10-21

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US (1) US7854154B2 (fr)
EP (1) EP1812181B1 (fr)
JP (1) JP5022232B2 (fr)
KR (1) KR101146932B1 (fr)
CN (1) CN101098763A (fr)
AT (1) ATE446147T1 (fr)
AU (1) AU2006326732C1 (fr)
BR (1) BRPI0605912A2 (fr)
CA (1) CA2594794C (fr)
DE (2) DE102005059653A1 (fr)
ES (1) ES2333261T3 (fr)
RU (1) RU2359767C2 (fr)
TW (1) TWI358331B (fr)
WO (1) WO2007068359A1 (fr)
ZA (1) ZA200705235B (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2527052A1 (fr) * 2011-05-24 2012-11-28 Siemens Aktiengesellschaft Procédé de fonctionnement pour une voie de laminage
CN104324951B (zh) * 2013-07-22 2016-08-24 宝山钢铁股份有限公司 单机架启动轧制力设定和控制方法
EP3517228A1 (fr) 2018-01-29 2019-07-31 Primetals Technologies Austria GmbH Règles d'un processus de laminage
CN114074118B (zh) * 2021-11-18 2022-10-14 东北大学 一种六辊冷轧机的轧制稳定性预测方法

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JPS5561309A (en) 1978-10-31 1980-05-09 Toshiba Corp Controller for rolling mill
JPS5568101A (en) 1978-11-17 1980-05-22 Kawasaki Steel Corp Stabilizing method for unsymmetric rolling work
JPS57115909A (en) 1981-01-09 1982-07-19 Toshiba Corp Rolling mill controller
JPS59166310A (ja) 1983-03-14 1984-09-19 Toshiba Corp 異速圧延制御方法
JPS60148608A (ja) * 1984-01-11 1985-08-05 Hitachi Ltd 異周速圧延制御におけるセツトアツプ方法
AU557122B2 (en) * 1984-07-24 1986-12-04 Kawasaki Steel Corp. Coiling a thin strip
JPH0659483B2 (ja) * 1985-09-17 1994-08-10 石川島播磨重工業株式会社 圧延板変形抵抗の計測方法
JPH0659486B2 (ja) 1986-02-05 1994-08-10 株式会社日立製作所 圧延設備の制御方法
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JPH09239417A (ja) * 1996-03-11 1997-09-16 Toshiba Corp 熱間圧延機の制御装置

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CN101098763A (zh) 2008-01-02
AU2006326732C1 (en) 2010-02-11
DE102005059653A1 (de) 2007-06-21
BRPI0605912A2 (pt) 2009-05-26
JP2008521621A (ja) 2008-06-26
RU2359767C2 (ru) 2009-06-27
US20080127696A1 (en) 2008-06-05
KR20080078778A (ko) 2008-08-28
TW200732056A (en) 2007-09-01
ZA200705235B (en) 2008-05-28
AU2006326732B2 (en) 2009-04-02
JP5022232B2 (ja) 2012-09-12
TWI358331B (en) 2012-02-21
CA2594794C (fr) 2010-06-29
ATE446147T1 (de) 2009-11-15
US7854154B2 (en) 2010-12-21
WO2007068359A1 (fr) 2007-06-21
KR101146932B1 (ko) 2012-05-23
AU2006326732A1 (en) 2007-06-21
DE502006005172D1 (de) 2009-12-03
ES2333261T3 (es) 2010-02-18
RU2007118157A (ru) 2008-11-20
CA2594794A1 (fr) 2007-06-21
EP1812181A1 (fr) 2007-08-01

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