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EP1030747B1 - Procede et installation de laminage a chaud de minces bandes d'acier - Google Patents

Procede et installation de laminage a chaud de minces bandes d'acier Download PDF

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Publication number
EP1030747B1
EP1030747B1 EP98962232A EP98962232A EP1030747B1 EP 1030747 B1 EP1030747 B1 EP 1030747B1 EP 98962232 A EP98962232 A EP 98962232A EP 98962232 A EP98962232 A EP 98962232A EP 1030747 B1 EP1030747 B1 EP 1030747B1
Authority
EP
European Patent Office
Prior art keywords
rolling
steel strip
hot
individuals
optimization algorithm
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98962232A
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German (de)
English (en)
Other versions
EP1030747A1 (fr
Inventor
Sven Kiriczi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19850492A external-priority patent/DE19850492A1/de
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP1030747A1 publication Critical patent/EP1030747A1/fr
Application granted granted Critical
Publication of EP1030747B1 publication Critical patent/EP1030747B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
    • 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
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/40—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling foils which present special problems, e.g. because of thinness
    • 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
    • B21B37/52—Tension control; Compression control by drive motor control

Definitions

  • the invention relates to a method and a device for hot rolling thin steel strips with a rolling mill at least one roll stand.
  • Hot and cold rolling mills are used to roll thin steel strips used, the cold rolling mills the hot rolling mills are subordinate.
  • EP 0 771 596 A1 describes a production plant for continuous or discontinuous known from hot strip, in the case of hot strip with a first roll stand group up to a thickness of about 2.5 mm is generated. With an intermediate heater can optionally by means of a second rolling group also hot strip with a thickness between 0.5 mm and 2.0 mm with austenitic and / or ferritic structure become. However, this is only possible if the hot strip between the two roll stand groups and between the Setting up the second roll stand group to the correct temperature is set, which is comparatively complex.
  • the object of the invention is reduce the cost of rolling thin steel strips or to optimize.
  • the rolling mill for hot rolling a thin steel strip by means of a rolling mill with at least one roll stand the rolling mill set so that the steel strip with a Outlet thickness, which is less than 0.75 mm, from the roll stand expires.
  • a cold rolling mill save.
  • the invention also drastically reduces the operating cost of a rolling mill reduced because of the energy consumption associated with cold rolling is saved. Furthermore, the Rolling operation.
  • the outlet thickness is smaller than 0.6 mm, which is the product range of the one Rolling mill designed according to the invention to be rolled Steel straps increased significantly again.
  • the embodiment of the invention is the outlet thickness larger than 0.5 mm.
  • the outlet thickness is greater than 0.4 mm.
  • An advantageous embodiment of the invention is the outlet thickness larger than 0.3 mm.
  • the invention is the inlet thickness with which Steel strip runs into the roll stand, larger than 1 mm.
  • the invention has the Rolling mill on several roll stands, with the inlet thickness in the first roll stand of a group of roll stands larger than 1 mm, and that the outlet thickness of the steel strip at outlet from the last rolling stand in this group smaller than 0.75 mm, in particular less than 0.6 mm.
  • the invention is the rolling mill before rolling the steel strip preset, with the default setting of the rolling mill depending on target values for profile and / or flatness for mill stands on the rolling mill, taking into account the profile is particularly advantageous.
  • a train regulation to regulate the train between the individual Roll stands a permissible speed limit and / or train limit value.
  • a control system 3 is provided, the control values ST for the actuators of the rolling mill 1, e.g. dependent on of belt parameters BP or framework parameters GP.
  • the control system 3 comprises a tension control and / or a Presetting of the rolling mill 1.
  • Input variables in the control system 3 include Process parameters VG, the output variables a pass schedule calculation 4.
  • an optimizer 5 is provided, the output variables OA determined as a function of input variables OE, which of the pass schedule calculation 4 can be specified.
  • the optimizer 2 shows a detailed illustration of the optimizer 5 with its input variables OE and its output variables OA.
  • 5 input values PR *, PL * and DI * for the profile, the flatness and the thickness of the metal strip 2 are provided as input variables OE of the optimizer when they leave the rolling mill 1.
  • 5 parameters MB of the steel strip are provided as input variables OE of the optimizer.
  • These parameters MB of the steel strip can include the geometric dimensions and the chemical properties and structural properties of the steel strip when it enters the rolling mill 1.
  • the combination of the target values PR * and DI * for profile and thickness, as well as the parameter MB of the steel strip, represents a particularly advantageous embodiment of the input variables OE of the optimizer 5.
  • the optimizer 5 determines target values PR * / i and / or PL * / i for profile and / or flatness behind the individual stands of rolling mill 1. It can be provided that only setpoints PR * / i and / or PL * / i for profile and / or flatness of the steel strip 2 behind the Roll stands of the rolling mill can be determined.
  • the output variables OA of the optimizer 5 also include a speed limit value VT and / or a tension limit value ⁇ T i for the tension in the steel strip 2 behind the i-th roll stand.
  • the speed limit value VT represents a minimum speed for the steel strip when it leaves the last stand of the rolling mill 1.
  • the tension limit value ⁇ T i represents a permissible maximum value for the train in the steel strip 2 behind the i-th roll stand.
  • the optimizer 5 outputs the degree of reduction ⁇ i for the individual i roll stands.
  • FIG. 3 shows a particularly advantageous alternative embodiment an optimizer.
  • additional Input values of the optimizer 6 setpoints GF * for the material or structural properties of the runout from the rolling mill 1 Steel strip 2 provided. These can include tensile strenght and hardness of the steel strip 2 include.
  • the combination from the setpoints PR *, GF * and DI * for profile, for Material or structure properties and the thickness, as well as the MB parameter of the steel strip represents a particularly advantageous one Design of the input variables OE of the optimizer 6 represents.
  • the control system 3 comprises the tension control 10 of the rolling mill 1 and the presetting 11 of the rolling mill 1.
  • the tension control 10 can be designed as a minimum tension control or as a tension control with loop lifters.
  • Input variables in the tension control include tension limit values ⁇ T i for the tension behind the i-th roll stands and a speed limit value VT for the speed of the steel strip 2 emerging from the rolling mill 1.
  • the output variable is a current setpoint I * / i for the current of the drive for the i-th roll stand.
  • a speed control is also implemented in the tension control 10.
  • the tension control 10 outputs speed and / or torque setpoints for a subordinate control.
  • a loop lifter angle ⁇ i of a loop lifter behind an i-th roll stand is an input variable in the tension control 10.
  • the factor k i is thus determined from analytical relationships into which certain properties of the rolling stand and the rolling stock are incorporated.
  • rolling mill properties such as the work roll diameter D i of the i-th roll stand or the load roll gap profile ⁇ i of the i-th roll stand are additional input variables OE of the options.
  • the load roll gap profile ⁇ i is advantageously determined by means of preprocessing (see, for example, DE 196 42 918).
  • the profile of a steel strip behind a roll stand is determined using equation (1) and k i using information processing based on neural networks in accordance with DE-OS 196 42 918. It is particularly advantageous to adapt the information processing based on neural networks.
  • the input variables OE are supplemented by variables that are necessary for the adaptation of the information processing based on neural networks. These can be the band parameters BP, for example. Details on the design and adaptation of the models can be found, for example, in DE 41 31 765, the article “Networks for Approximation and Learning", Proceedings of the IEEE, Vol. 78, No. 9, September 1990, and the article “Fast Learning in Networks of Locally-Tuned Processing Units", New Computation 1, pages 281 to 294, Massachussetts Institute of Technology, 1989.
  • the expected actual values for the material or structural properties of the steel strip 2 running out of the rolling mill 1 of the individual individuals are determined and compared with the target values GF * for the material or structural properties of the steel strip 2 running out of the rolling mill 1. From the size of the deviation between the actual values and the target values GF * for the material or structural properties of the steel strip 2 running out of the rolling mill 1, the individuals are assigned a probability of survival.
  • the individuals weighted with their survival probability are statistically selected into surviving individuals 42 and non-surviving individuals 31.
  • an initial thickness of less than 0.75 mm, in particular an initial thickness of 0.6 mm it is particularly advantageous to perform a simultaneous profile and structure optimization.
  • the procedure described above using genetic algorithms is only a particularly advantageous exemplary embodiment. However, other optimization methods for simultaneously optimizing the profile and structure are also possible.
  • Structural optimization includes, for example, the method described above or a method according to "An AI System for the Prediction of Flow Response in Hot Working" by JJM Too, K. Ide, P. Maheral, N. Pussegoda, EG Sherwood and T. Gomi, 37 th MWSP Conf.
  • flanking measure it is particularly advantageous to link the tension control and the profile setting, as is described, for example, in FIG. This means that the additional determination of a train limit value and / or a speed limit value is particularly advantageous. This feature is particularly advantageous as a flanking measure for the simultaneous optimization of the structure and profile. However, it also enables an outlet thickness of less than 0.75 mm to be achieved when hot rolling, that is to say in particular above a temperature of 800 ° C.
  • optimization criteria such as energy consumption or roller wear
  • the invention in particular by hot rolling on a Outlet thickness between 0.75 and 0.3 mm, there is a significant Cost advantage over known rolling mills. Especially the cost advantage of hot rolling is significant below 0.6 mm.
  • the invention is particularly advantageous to carry in a rolling mill with at least four Rolling mills. In this way, many are facing optimization Degrees of freedom available.

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

Claims (15)

  1. Procédé de laminage à chaud d'une bande (2) d'acier, au moyen d'un train (1) de laminoir comprenant plusieurs cages de laminoir, dans lequel on effectue avant le laminage de la bande (2) d'acier un préréglage du train (1) de laminoir à chaud et la bande (2) d'acier sort de la dernière cage de laminoir en ayant une épaisseur inférieure à 0,75 mm, caractérisé en ce que l'on utilise un algorithme d'optimisation, on utilise la valeur de consigne pour le profil et/ou la planéité de la bande (2) d'acier à la sortie de la dernière cage de laminoir comme grandeur d'entrée et on détermine des valeurs de consigne pour le profil et/ou pour la planéité après les diverses cages de laminoir en tant que grandeurs de sortie au moyen desquelles on effectue le préréglage.
  2. Procédé suivant la revendication 1, caractérisé en ce que l'algorithme d'optimisation prend en compte l'épaisseur de la bande (2) d'acier à la sortie du train (1) de laminoir comme grandeur d'entrée.
  3. Procédé suivant la revendication 1 ou 2, caractérisé en ce que l'algorithme d'optimisation prend en compte des paramètres de la bande (2) d'acier comme des dimensions géométriques, des propriétés chimiques et des propriétés de structure comme grandeurs d'entrée.
  4. Procédé suivant l'une des revendications précédentes, caractérisé en ce que l'algorithme d'optimisation détermine une vitesse minimum de la bande (2) d'acier à la sortie de la dernière cage de laminoir du train (1) de laminoir comme grandeur d'entrée.
  5. Procédé suivant l'une des revendications précédentes, caractérisé en ce que l'algorithme d'optimisation détermine une valeur maximum de la traction de la bande (2) d'acier à la sortie de la dernière cage du train (1) de laminoir comme grandeur d'entrée.
  6. Procédé suivant l'une des revendications précédentes, caractérisé en ce que l'algorithme d'optimisation détermine les degrés de réduction pour les diverses cages de laminoir comme grandeurs d'entrée.
  7. Procédé suivant l'une des revendications précédentes, caractérisé en ce que l'on optimise simultanément le profil et la structure de la bande (2) d'acier.
  8. Procédé suivant la revendication 7, caractérisé en ce que l'on optimise la structure de la bande (2) d'acier avec la condition secondaire d'un profil donné à l'avance.
  9. Procédé suivant l'une des revendications précédentes, caractérisé en ce que l'algorithme d'optimisation utilise un algorithme génétique.
  10. Procédé suivant la revendication 9, caractérisé en ce que l'algorithme d'optimisation comprend les stades suivants :
    a) on associe des valeurs pour les grandeurs de sortie à optimiser à des gènes auxquels sont associés des individus d'une population,
    b) on rassemble un certain nombre d'individus en une population initiale,
    c) on modifie d'une valeur aléatoire au moins certains valeurs des gènes et/ou on les recombine aux gènes d'autres individus,
    d) on rassemble des gènes allant ensemble en des chromosomes qui sont transmis en commun lors de la recombinaison,
    e) on évalue des individus par leurs gènes au moyen d'une fonction d'optimisation et on effectue sur la base de cette optimisation un choix d'individus pour une population nouvelle en préférant des individus qui satisfont mieux la fonction d'optimisation que d'autres individus,
    f) on ne tient pas compte davantage des individus restants,
    g) on répète itérativement le cycle d'optimisation avec la nouvelle population servant de population initiale jusqu'à obtenir une solution évaluée comme optimum.
  11. Procédé suivant l'une des revendications précédentes, caractérisé en ce que l'on utilise comme critère d'optimisation la consommation d'énergie ou l'usure des cylindres.
  12. Procédé suivant l'une des revendications précédentes, caractérisé en ce que la bande (2) d'acier sort de la cage de laminoir à une température qui est supérieure à 600°C.
  13. Procédé suivant la revendication 12, caractérisé en ce que la bande (2) d'acier sort de la cage de laminoir à une température qui est supérieure à 1000°C.
  14. Train (1) de laminoir à chaud pour le laminage à chaud d'une mince bande (2) d'acier, comprenant plusieurs cages de laminoir pour la mise en oeuvre d'un procédé suivant l'une des revendication 1 à 13, caractérisé en ce qu'au train (1) de laminoir à chaud est associé un moyen d'exécution d'un algorithme d'optimisation dont les grandeurs de sortie peuvent être envoyées à un système (13) de commande relié au train (1) de laminoir à chaud en tant que grandeurs de réglage pour le préréglage (11) des cages de laminoir.
  15. Train (1) de laminoir à chaud suivant la revendication 14, caractérisé en ce qu'il lui est associé une régulation (10) de traction coordonnée au moyen d'un algorithme d'optimisation.
EP98962232A 1997-11-10 1998-11-09 Procede et installation de laminage a chaud de minces bandes d'acier Expired - Lifetime EP1030747B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE19749614 1997-11-10
DE19749614 1997-11-10
DE19850492 1998-11-02
DE19850492A DE19850492A1 (de) 1997-11-10 1998-11-02 Verfahren und Einrichtung zum Warmwalzen dünner Stahlbänder
PCT/DE1998/003275 WO1999024180A1 (fr) 1997-11-10 1998-11-09 Procede et installation de laminage a chaud de minces bandes d'acier

Publications (2)

Publication Number Publication Date
EP1030747A1 EP1030747A1 (fr) 2000-08-30
EP1030747B1 true EP1030747B1 (fr) 2003-11-26

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Application Number Title Priority Date Filing Date
EP98962232A Expired - Lifetime EP1030747B1 (fr) 1997-11-10 1998-11-09 Procede et installation de laminage a chaud de minces bandes d'acier

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EP (1) EP1030747B1 (fr)
AT (1) ATE254968T1 (fr)
WO (1) WO1999024180A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8702050A (nl) * 1987-09-01 1989-04-03 Hoogovens Groep Bv Werkwijze en inrichting voor de vervaardiging van bandvormig vervormingsstaal met goede mechanische en oppervlakte-eigenschappen.
WO1992000817A1 (fr) * 1990-07-06 1992-01-23 The Broken Hill Proprietary Company Limited Controle de l'effort exerce sur une barre entre les montants d'un laminoir
WO1993000181A1 (fr) * 1991-06-28 1993-01-07 Siemens Aktiengesellschaft Systeme de regulation de la fabrication de feuillards lamines a chaud au moyen de laminoirs a chaud a cages multiples
DE19503363A1 (de) * 1994-02-15 1995-09-07 Siemens Ag Einrichtung und Verfahren zum Regeln der Planheit und/oder Spannungsverteilung von gewalzten Metallbändern
NL1000693C2 (nl) * 1995-06-29 1996-12-31 Hoogovens Staal Bv Inrichting voor het vervaardigen van een stalen band.
DE19540978A1 (de) * 1995-11-03 1997-05-07 Schloemann Siemag Ag Produktionsanlage zum kontinuierlichen- oder diskontinuierlichen Auswalzen von Warmband

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Publication number Publication date
EP1030747A1 (fr) 2000-08-30
ATE254968T1 (de) 2003-12-15
WO1999024180A1 (fr) 1999-05-20

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