EP0000454B1 - Verfahren zum Steuern der Walzgutspannung zwischen aufeinanderfolgenden Walzgerüsten beim Warmwalzen von dickem Walzgut. - Google Patents

Verfahren zum Steuern der Walzgutspannung zwischen aufeinanderfolgenden Walzgerüsten beim Warmwalzen von dickem Walzgut. Download PDF

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Publication number
EP0000454B1
EP0000454B1 EP19780400031 EP78400031A EP0000454B1 EP 0000454 B1 EP0000454 B1 EP 0000454B1 EP 19780400031 EP19780400031 EP 19780400031 EP 78400031 A EP78400031 A EP 78400031A EP 0000454 B1 EP0000454 B1 EP 0000454B1
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EP
European Patent Office
Prior art keywords
speed
product
slip
cages
value
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
Application number
EP19780400031
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English (en)
French (fr)
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EP0000454A1 (de
Inventor
Philippe Millamon
Pierre Petit
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.)
Institut de Recherches de la Siderurgie Francaise IRSID
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Institut de Recherches de la Siderurgie Francaise IRSID
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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

Definitions

  • the invention relates to the hot rolling of thick, flat or long products in trains fitted with tandem cages and, more specifically, to the control of the tension between successive cages.
  • looping For hot products which are not very thick, the control of the tension between cages is well resolved by the so-called “looping” method which consists in bending the product in the form of a loop between the cages and in regulating the speeds of the latter so as to maintain constant the length of the loop.
  • the tension between cages can be measured directly, by means of a tensiometer and, on the other hand, the control of metal flow rates does not need to be as precise because the tensile strength is high and the band can withstand significant stresses without the necking appear.
  • the present invention proposes to allow the control of the rolling of thick hot products, by indirectly determining and continuously adjusting the tension of the product.
  • the invention uses the basic relationships already known between the speeds of rotation of the working cylinders of consecutive cages and product flow speeds upstream and downstream of each cage, during rolling. These relationships are described, for example, in the review “Tech- nische Mitteilungen AEG-Telefunken •, vol. 66, n ° 6, June 1976, page 257. However, they were not considered to be exploitable by the experts in rolling to carry out the indirect measurement and the adjustment of the tension of the products, which used torque measurements. or the drive current of the cage motors to carry out this regulation.
  • the setpoint value chosen is equal to the value of the slip in the absence of traction increased by 2 to 5%.
  • the speed of the product is measured by the so-called “correlation” method, known per se, which will be recalled below.
  • the values of the rotational speeds of the rolls corresponding, for a product, to rolling under low tension can be used as preset values for a subsequent blank of similar characteristics.
  • the method according to the invention is based on an indirect determination of the traction between cages, using the measurement of the slip.
  • sliding is meant the difference between the speed of the product and the peripheral speed of the cylinder, reduced to the speed of the cylinder.
  • a backward sliding if we refer to the speed of the product at the entry of the cage
  • a forward sliding if we consider the speed of exit of the product.
  • product 1 during rolling is represented at the moment when, engaged in a cage, referenced 2, it will enter the next cage 3.
  • the two cages have been shown diagrammatically by their working rolls only.
  • the blank At the entry of the cage 2 the blank has a speed V e , it emerges therefrom, after reduction of thickness, with the speed Vg.
  • the cylinders having a linear speed V c , the forward sliding of the cage 2 is given by the formula:
  • the product 1 not yet being engaged in the cage 3, g o is the value of the slip without traction.
  • the speeds of the cylinder and of the product are measured continuously, the first for example using a tachometric dynamo, for the second any sufficiently precise means can obviously be used, but the applicant preferably recommends the process and the device described in French Patent No. 2,161,757.
  • This method consists in calculating the speed by detection and correlation of two similar random signals, shifted in time and linked to the moving product.
  • Two optical detectors 4 and 5, for example photoelectric receivers, are placed between the cages, above of the product, and are located at a well-defined distance from each other with respect to the direction of travel of the rolled product.
  • the signals emitted by the detectors 4 and 5 are sent to a time-correlated correlator: the latter, not forming part of the invention, has not been shown here and, for more details on this apparatus, reference may be made to the aforementioned patent.
  • a time-correlated correlator the latter, not forming part of the invention, has not been shown here and, for more details on this apparatus, reference may be made to the aforementioned patent.
  • the signals supplied by the passage in front of the detectors of the head of the product are used, therefore the average speed of movement of the head of the product. This method thus makes it possible to know, at all times, the real speed of the blank with great precision.
  • the signals corresponding to the speeds of the cylinders and of the product are sent to a device making it possible to calculate the value of the slip.
  • This value is continuously compared with a setpoint value equal, in the example considered, to the value of the slip without traction increased by 3%.
  • the comparator When the actual slip value becomes lower or higher than the set value, the comparator generates an error signal.
  • the latter is transmitted to the control computer of the rolling line which immediately triggers an action on the speed of the stands, so as to reduce the error signal to zero.
  • This modification can be carried out on cage 2, on cage 3 or on both simultaneously.
  • the speed of the cage 2 can be increased until the error signal is canceled.
  • the values of the rotational speeds determined during the rolling of the first blank using the method according to the invention can be used as preset values before the engagement of the following ones.
  • the method according to the invention can very well be implemented on a manually controlled rolling mill, the information collected then being used directly and the corrective actions carried out by the personnel responsible for conducting operations.
  • the error signal then becomes one of the parameters controlling the speed regulation of the cages.
  • the application of the method according to the invention is not limited to single tandem cages, but can easily be generalized to three and then to any number of cages where the product is taken simultaneously.
  • a first approximation generally sufficient, consists in considering the cages as independent two by two.
  • the last has been incorrectly preset it appears at the engagement of the product a variation in the slip between the first two cages and a value different from the reference between the last two.
  • a satisfactory result is then obtained by considering the last two cages as isolated from the first and by only modifying the speed of rotation of the third to bring the slip back to the set value.
  • the method according to the invention making it possible to detect traction or compression as soon as it appears and to take immediate corrective action, appreciably reduces the number of blanks rejected because of their bad geometry and presents , therefore, a certain economic interest.

Landscapes

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

Claims (4)

1. Verfahren zum Steuern der Walzgutspannung zwischen zwei aufeinanderfolgenden, Arbeitswalzen aufweisenden Walzgerüsten beim Warmwalzen von dickem Walzgut, dadurch gekennzeichnet, daß der aus einer fortlaufenden Messung der Walzgutgeschwindigkeit Vs zwischen den Gerüsten und aus einer fortlaufenden Messung der Umfangsgeschwindigkeit Vc der Arbeitswalzen eines Gerüstes für dieses Gerüst sich ergebende Gleitwert go durch Einstellung der Rotationsgeschwindigkeit der Arbeitswalzen mindestens eines der beiden Gerüste im wesentlichen auf einem einer geringen Zugspannung entsprechenden Soll-Wert gehalten wird.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß durch den fortlaufenden Vergleich des durch Anwendung der Formel go = Vs - Vc Vc ermittelten Gleitwertes go mit dem Sollgleitwert ein Fehlersignal erzeugt und dieses Fehlersignal durch Einstellung der Rotationsgeschwindigkeit der Arbeitswalzen mindestens eines Gerüstes auf den Wert 0 gebracht wird.
3. Verfahren nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß der SollGleitwert einem Gleitwert entspricht, der sich ohne eine Erhörung der Zugspannung um 2 bis 5 % ergibt.
. 4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Walzgutgeschwindigkeit durch den Vergleich zweier von dem Walzgut ausgehender, gleicher, gegeneinander phasenverschobener Signale gemessen wird, wobei der Vergleich mittels eines Korrelations-Rechners mit vorgegebener Verzögerung erfolgt und der Anfangswert der Verzögerung der mittleren Geschwindigkeit des Walzgutkopfes vor den die Signale liefernden Meßpunkten entspricht.
EP19780400031 1977-06-24 1978-06-22 Verfahren zum Steuern der Walzgutspannung zwischen aufeinanderfolgenden Walzgerüsten beim Warmwalzen von dickem Walzgut. Expired EP0000454B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7719710 1977-06-24
FR7719710A FR2395086A1 (fr) 1977-06-24 1977-06-24 Procede de controle de la tension de produits epais lamines a chaud en prise entre deux cages successives

Publications (2)

Publication Number Publication Date
EP0000454A1 EP0000454A1 (de) 1979-01-24
EP0000454B1 true EP0000454B1 (de) 1982-02-24

Family

ID=9192646

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19780400031 Expired EP0000454B1 (de) 1977-06-24 1978-06-22 Verfahren zum Steuern der Walzgutspannung zwischen aufeinanderfolgenden Walzgerüsten beim Warmwalzen von dickem Walzgut.

Country Status (3)

Country Link
EP (1) EP0000454B1 (de)
DE (1) DE2861644D1 (de)
FR (1) FR2395086A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2815341A1 (de) * 1978-04-10 1979-10-18 Bbc Brown Boveri & Cie Verfahren und schaltungsanordnung zur regelung der laengskraft zwischen walzgeruesten einer kontinuierlichen walzstrasse mit einzelantrieben
FR2898523B1 (fr) * 2006-03-14 2009-02-27 Alstom Power Conversion Sa Procede de laminage d'une bande de tole.
JP6725269B2 (ja) * 2016-03-09 2020-07-15 本田技研工業株式会社 オーバーヘッドカムシャフト式エンジン

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1323176A (fr) * 1961-04-20 1963-04-05 Schloemann Ag Procédé et montage pour mesurer et régler la traction ou la compression entre deux ou plusieurs cages de trains de laminoir continus comprenant des cages successives et destinés notamment à la production de laminés rigides
FR1355412A (fr) * 1962-05-11 1964-03-13 Schloemann Ag Procédé pour mesurer des contraintes de traction et de compression dans la matière laminée, entre les cages d'un groupe de plusieurs cages d'un train de laminoir continu
DE1284922B (de) * 1963-03-14 1968-12-12 Schloemann Ag Verfahren zum Nachstellen von Walzgeruesten in kontinuierlichen Walzstrassen, insbesondere in Mittelstahlstrassen
GB1163274A (en) * 1965-12-28 1969-09-04 British Iron Steel Research Improvements in and relating to Rolling Mills
DE1527702A1 (de) * 1966-11-12 1970-06-04 Siemens Ag Verfahren und Einrichtung zur Erfassung von Rutschvorgaengen in einer Umkehrwalzenstrasse
BE790341A (de) * 1971-10-29 1973-04-20 Siderurgie Fse Inst Rech
US3807208A (en) * 1972-07-31 1974-04-30 Westinghouse Electric Corp Interstand tension-compression control system
JPS5147146B2 (de) * 1972-09-06 1976-12-13

Also Published As

Publication number Publication date
EP0000454A1 (de) 1979-01-24
FR2395086A1 (fr) 1979-01-19
DE2861644D1 (en) 1982-03-25
FR2395086B1 (de) 1980-04-04

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