EP0000855B1 - Verfahren zum Vorsteuern von einer kontinuierlichen Tandemstrasse beim Warmwalzen von Metall - Google Patents

Verfahren zum Vorsteuern von einer kontinuierlichen Tandemstrasse beim Warmwalzen von Metall Download PDF

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Publication number
EP0000855B1
EP0000855B1 EP19780400073 EP78400073A EP0000855B1 EP 0000855 B1 EP0000855 B1 EP 0000855B1 EP 19780400073 EP19780400073 EP 19780400073 EP 78400073 A EP78400073 A EP 78400073A EP 0000855 B1 EP0000855 B1 EP 0000855B1
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EP
European Patent Office
Prior art keywords
product
speed
stand
rotational speed
rolling
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Expired
Application number
EP19780400073
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English (en)
French (fr)
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EP0000855B2 (de
EP0000855A1 (de
Inventor
Philippe Millamon
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Institut de Recherches de la Siderurgie Francaise IRSID
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Institut de Recherches de la Siderurgie Francaise IRSID
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Application filed by Institut de Recherches de la Siderurgie Francaise IRSID filed Critical Institut de Recherches de la Siderurgie Francaise IRSID
Publication of EP0000855A1 publication Critical patent/EP0000855A1/de
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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
    • B21B37/48—Tension control; Compression control
    • B21B37/52—Tension control; Compression control by drive motor control
    • 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
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions

Definitions

  • the invention relates to the hot rolling of flat or long products, in particular thick products, in rolling mills with tandem cages and, more specifically, the presetting of the cages before engagement of the product.
  • tandem cages which has long been established for finishing trains, is beginning to gain importance for the hot rolling of thick products. It allows, in fact, a significant saving on the dimensioning of the halls and the length of the transport tables, a gain in heating by reduction of the cooling times and a shorter rolling time, therefore better productivity.
  • the problems encountered are much more complex, due to the large thicknesses and low mechanical characteristics, than for cold rolling or even hot rolling of thin products.
  • control, within relatively narrow limits, of the tension (traction or compression) between the cages is essential if one wishes to avoid, on too many blanks, geometry or surface defects.
  • a tension can, of course, appear at any time during the rolling of the product, the characteristics of which are not always strictly constant, but the greatest risk of appearance lies at the time of engagement of the debouche, already in engagement in one cage, in the next. It is, of course, possible to take the necessary measures as soon as voltage is detected, but it is clearly preferable to act before the product even reaches the downstream cage by presetting the latter, that is to say by giving it a speed compatible with that of the product leaving the upstream cage.
  • a method of presetting has already been proposed before engagement of the product in the corresponding cage consisting in calculating the expected thickness reductions and, by equalizing the flow rates, in deducing therefrom the speeds of the product and of the cylinders. But this method can only give a very rough approximation: the thicknesses obtained in practice are rarely those calculated. There is therefore a risk of seeing looping appear if the calculated flow is insufficient, or even more dangerous pulling because, except for very high values, it does not result in a phenomenon visible to the operator during rolling.
  • the object of the present invention is precisely, in the case where there are rolling models using the speed of the product as a reference quantity, to provide a finer pre-setting of the cages.
  • measurements of inlet and outlet thickness of the product and measurements of rolling force are also carried out and the coefficients of the model are corrected more precisely by recalculating them from the value measured from the exit speed of the product from the upstream stand and from the measured values of the thicknesses and the rolling force.
  • the speed of exit of the product from the upstream cage is measured by the so-called correlation method, known per se, which will be recalled below.
  • the method according to the invention can be applied to a rolling mill where the product is engaged in more than two successive stands. A sufficient approximation is then obtained by considering the cages as independent two by two and by presetting them successively.
  • the method according to the invention essentially consists in ensuring the compatibility of the speed ratio of two successive cages with the flow rates of metal having to pass through them even before the product has reached the downstream cage.
  • the only possible preset mode is the use, for a rough draft, of the values obtained for a previous rough draft of similar characteristics, rolled under satisfactory conditions, using for example of the process described in FR-A-2 395 086.
  • recent progress made in the knowledge of deformation phenomena during rolling has made it possible to develop a certain number of models, linking quantities such as input and output speeds and thicknesses, rolling forces and torques, product temperature dimensions and variations, input and output pulls, models which are currently available in the literature.
  • it is necessary to use a model where the reference quantity is the speed in order to be able to recalculate all the coefficients from a simple measurement of product exit speed.
  • the process according to the invention can, of course, be used alone or followed by any tension control process when the product has entered the downstream cage, but it is particularly advantageous to associate it with the tension control process continuously exposed in FR-A-2 395 086.
  • the detectors and the signal processing means which they supply may be common to both methods. It is thus possible to ensure complete control of the tension to which the product is subjected, from its entry into the upstream cage to its exit from the downstream cage, and, consequently, appreciably reducing the number of blanks discarded for . poor geometry due to excessive traction or compression.
  • the product considered is a thick flat product, but it is very clear that the transposition to any long product can be done immediately, by replacing the concept of thickness by that of section.
  • the signals emitted by detectors 4 and 5 are sent to a delay correlator enslaved; to determine the initial value of the delay, the signals supplied by the passage in front of the detectors of the head of the product are used.
  • This device is identical to that recommended in FR-A-2 395 086 and it is moreover advantageous to use a single pair of detectors judiciously placed between each cage to implement the two methods together.
  • the desired thickness reductions are determined and, using the model, the speeds V 2 and V 3 to be imposed on the working rolls of each of the cages are calculated. .
  • the parameter to take into account is the ratio of the speeds of the two cages.
  • FIG. 2 shows the speed of the product 1 as a function of its position relative to the cages 2 and 3 marked on the abscissa axis by the points C 2 and C 3 .
  • the curve a corresponds to the optimal preset which has just been described
  • the curve b on the other hand translates an incorrect preset, with appearance of a traction too strong with the engagement in the cage 3, traction caused by a rotation speed too high from this cage.
  • the presetting method according to the invention can easily be extended to a higher number of cages where the product will be taken simultaneously. Indeed, according to a first generally sufficient approximation, we consider the cages as independent two by two. The first two cages having been preset in the manner described above, the second and the third are then considered in isolation and the latter is preset by the method according to the invention, keeping however constant the speed ratio of the first two cages.
  • the method according to the invention therefore makes it possible to optimally preset the cages of a rolling mill and its association with a method for continuously monitoring the traction between cages is of definite economic interest by significantly reducing the number of products discarded for defects in geometry.

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

Claims (5)

1. Verfahren zum Voreinstellen einer fortlaufend Tandestraße zum Warmwalzen insbesondere von dickem Walzgut mittels eines Modells, das Beziehungen zwischen den Werten einzelner Parameter - z.B. der Eintritts- und Austrittsgeschwindigkeit, der Abmessungen und der Temperaturänderungen des Walzgutes, der Walzdruckkräfte und -kräftepaare, des Gleitverhaltens, der Eintritts- und der Austrittszugkräfte - vermittelt, wobei die Geschwindigkeit des Walzgutes als Bezugsgröße dient und die Rotationsgeschwindigkeit der Walzen gesteuert wird, dadurch gekennzeichnet, daß man
- bei für jedes Gerüst wahlweise vorbe-, stimmter Dickenabnahme des Walzgutes mittels des Modells das Verhältnis der Walzenrotationsgeschwindigkeiten des vorderen und des hinteren Gerüstes und die Austrittsgeschwindigkeit des Walzgutes beim Verlassen des vorderen Gerüstes berechnet;
- die Austrittsgeschwindigkeit des Walzgutes beim Verlassen des vorderen, allein mit dem Walzgut im Eingriff befindlichen Gerüstes mißt;
-die gemessene Geschwindigkeit mit der errechneten Geschwindigkeit vergleicht;
-falls notwendig die von dem Modell gelieferten, die einzelnen zueinander in Beziehung gesetzten Parameter betreffenden Koeffizienten nach Maßgabe der gemessenen Walzgutgeschwindigkeit korrigiert;
-mittels der korigierten Modellkoeffizienten das neue Verhältnis der Rotationsgeschwindigkeiten der Walzen der beiden Gerüste errechnet;
-die Rotationsgeschwindigkeit mindestens eines Gerüstes nach Maßgabe des neuen Verhältnisses vor dem Eintritt des Walzgutes in das hintere Gerüst ändert.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß man die neue Rotationsgeschwindigkeit des hinteren Gerüstes nach Maßgabe des neuen Verhältnisses der Rotationsgeschwindigkeiten der beiden Gerüste errechnet, wobei Rotationsgeschwindigkeit des vorderen Gerüstes konstant gehalten wird.
3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß man die neue Rotationsgeschwindigkeit des vorderen Gerüstes nach Maßgabe des neuen Verhältnisses der Rotationsgeschwindigkeiten der beiden Gerüste errechnet, wobei Rotationsgeschwindigkeit des hinteren Gerüstes konstant gehalten wird.
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß man die Dicke des Walzgutes am Eintritt und am Austritt und die Walzdruckkraft mißt und die Modellkoeffizienten nach Maßgabe der am vorderen Gerüst gemessenen Austrittsgeschwindigkeit des Walzgutes, der gemessenen Dickenwerte und der Walzdruckkraft neu errechnet und ändert.
5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß man die Austrittsgeschwindigkeit des Walzgutes am vorderen Gerüst durch den Vergleich zweier von dem Walzgut ausgehender, zufälligen Schwankungen unterworfener, gleicher, gegeneinander phasenverschobener Signale mißt, wobei der Vergleich mittels eines Korrelators mit gesteuerter Verzögerung erfolgt und der Anfangswert der Verzögerung der mittleren Durchgangsgeschwindigkeit des Walzgutkopfes vor den Empfängern entspricht.
EP19780400073 1977-08-08 1978-08-04 Verfahren zum Vorsteuern von einer kontinuierlichen Tandemstrasse beim Warmwalzen von Metall Expired EP0000855B2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7724457A FR2399883A1 (fr) 1977-08-08 1977-08-08 Procede de prereglage d'un train continu a cages tandem pour le laminage a chaud de produits metalliques
FR7724457 1977-08-08

Publications (3)

Publication Number Publication Date
EP0000855A1 EP0000855A1 (de) 1979-02-21
EP0000855B1 true EP0000855B1 (de) 1981-01-28
EP0000855B2 EP0000855B2 (de) 1987-04-29

Family

ID=9194386

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19780400073 Expired EP0000855B2 (de) 1977-08-08 1978-08-04 Verfahren zum Vorsteuern von einer kontinuierlichen Tandemstrasse beim Warmwalzen von Metall

Country Status (3)

Country Link
EP (1) EP0000855B2 (de)
DE (1) DE2860375D1 (de)
FR (1) FR2399883A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0004598A2 (de) * 1978-04-10 1979-10-17 BROWN, BOVERI & CIE Aktiengesellschaft Mannheim Verfahren und Schaltungsanordnung zur Regelung der Längskraft zwischen Walzgerüsten einer kontinuierlichen Walzstrasse mit Einzelantrieben
EP0439663A1 (de) * 1990-02-02 1991-08-07 Siemens Aktiengesellschaft Verfahren zum Steuern einer kontinuierlichen, mehrgerüstigen Walzstrasse
EP0455381A1 (de) * 1990-05-01 1991-11-06 Allegheny Ludlum Corporation Verfahren zur Regelung der Spannung in einem Metallwalzwerk
AU636545B1 (en) * 1992-01-28 1993-04-29 Kabushiki Kaisha Toshiba System for controlling strip thickness in rolling mills

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004022334A1 (de) * 2004-05-06 2005-12-01 Siemens Ag Verfahren zum Walzen eines Walzgutes mit Übergangsbereich
FR3067026A1 (fr) 2017-05-31 2018-12-07 Lionel Gerard Vandenbulcke Composite a matrice ceramique resistant a la corrosion et procede de fabrication

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1427926C3 (de) * 1965-12-22 1975-05-22 Kloeckner-Werke Ag, 4100 Duisburg Drehzahlregelung fur die Walzen eines Walzgerüstes
GB1163274A (en) * 1965-12-28 1969-09-04 British Iron Steel Research Improvements in and relating to Rolling Mills
BE790341A (de) * 1971-10-29 1973-04-20 Siderurgie Fse Inst Rech
US3762194A (en) * 1972-06-28 1973-10-02 Gen Electric Constant speed driven continuous rolling mill
JPS5147146B2 (de) * 1972-09-06 1976-12-13
DE2541071C3 (de) * 1975-09-15 1984-07-12 Siemens AG, 1000 Berlin und 8000 München Vorrichtung zur Regelung der im Walzgut übertragenen Zugkraft in einer mehrgerüstigen kontinuierlichen Walzstraße

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0004598A2 (de) * 1978-04-10 1979-10-17 BROWN, BOVERI & CIE Aktiengesellschaft Mannheim Verfahren und Schaltungsanordnung zur Regelung der Längskraft zwischen Walzgerüsten einer kontinuierlichen Walzstrasse mit Einzelantrieben
EP0004598A3 (en) * 1978-04-10 1979-10-31 Brown, Boveri & Cie Aktiengesellschaft Mannheim Process and circuit for interstand tension control in a continuous rolling mill having individual drives
EP0439663A1 (de) * 1990-02-02 1991-08-07 Siemens Aktiengesellschaft Verfahren zum Steuern einer kontinuierlichen, mehrgerüstigen Walzstrasse
EP0455381A1 (de) * 1990-05-01 1991-11-06 Allegheny Ludlum Corporation Verfahren zur Regelung der Spannung in einem Metallwalzwerk
AU636545B1 (en) * 1992-01-28 1993-04-29 Kabushiki Kaisha Toshiba System for controlling strip thickness in rolling mills

Also Published As

Publication number Publication date
EP0000855B2 (de) 1987-04-29
FR2399883A1 (fr) 1979-03-09
DE2860375D1 (en) 1981-03-19
EP0000855A1 (de) 1979-02-21
FR2399883B1 (de) 1980-04-18

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