EP0000855A1 - 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
EP0000855A1
EP0000855A1 EP78400073A EP78400073A EP0000855A1 EP 0000855 A1 EP0000855 A1 EP 0000855A1 EP 78400073 A EP78400073 A EP 78400073A EP 78400073 A EP78400073 A EP 78400073A EP 0000855 A1 EP0000855 A1 EP 0000855A1
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EP
European Patent Office
Prior art keywords
speed
product
model
cage
upstream
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Application number
EP78400073A
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English (en)
French (fr)
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EP0000855B2 (de
EP0000855B1 (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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    • 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 we want 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 the engagement of the blank, 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 pre-adjusting the latter, that is to say by giving it a speed compatible with that of the product leaving the upstream cage.
  • a presetting method has already been proposed which consists in calculating the expected thickness reductions and, by equalizing the flow rates, in deducing 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 loopbacks appear if the calculated flow is insufficient, or even more traction. dangerous 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.
  • one carries out also measurements of product inlet and outlet thickness and rolling force measurements in order to more precisely correct the coefficients of the model.
  • the speed of product exit is measured by the so-called correlation method, known per se, which will be recalled later.
  • 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 patent application No. 77 / 19,710.
  • recent progress made in the knowledge of deformation phenomena in rolling turns has made it possible to develop a certain number of models, connecting quantities such as thicknesses of entry and exit, forces of rolling, variations of product temperature, inlet and outlet speeds, 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 patent application n ° 77 / 19.710.
  • the detectors and the signal processing means which they supply may be common to the two 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 bad 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 time-delayed correlator; 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 patent application No. 77 / 19.710 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 cylinders of each of the cages are calculated. ..In fact, to obtain the same result several adjustments are possible because the parameter to take into account is the ratio of the speeds of the two cages.
  • the speed of the product 1 is represented 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 '
  • V S its output speed
  • the speed of the product must increase slightly since it is preferable to laminate under light traction, as the applicant has explained in patent application No. 77 /19.710.
  • the product is only engaged in the downstream cage and its speed increases again.
  • 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. However, if the rolling model is sufficiently developed, it can be taken into account more rigorously that the speed variation between the last two stands is partly due to the traction which is established between the first two at the time of engagement. in the third. Gradually, we can therefore preset any number of 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 process of continuous control of the traction between cages is of definite economic interest by substantially 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)
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
FR7724457 1977-08-08
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

Publications (3)

Publication Number Publication Date
EP0000855A1 true EP0000855A1 (de) 1979-02-21
EP0000855B1 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 (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
WO2018220296A1 (fr) 2017-05-31 2018-12-06 Lionel Vandenbulcke Composite à matrice céramique résistant à la corrosion et procédé de fabrication

Families Citing this family (4)

* 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
DE59003705D1 (de) * 1990-02-02 1994-01-13 Siemens Ag Verfahren zum Steuern einer kontinuierlichen, mehrgerüstigen Walzstrasse.
US5103662A (en) * 1990-05-01 1992-04-14 Allegheny Ludlum Corporation Tandem rolling mill tension control with speed ratio error discrimination
JPH05200420A (ja) * 1992-01-28 1993-08-10 Toshiba Corp マットロール圧延用板厚制御装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1505873A (fr) * 1965-12-22 1967-12-15 Kloeckner Werke Ag Procédé permettant d'éviter les malformations de la tête de la matière laminéedans des trains de laminoir continus pour profilés et fers moyens
FR1514209A (fr) * 1965-12-28 1968-02-23 British Iron Steel Research Perfectionnements aux laminoirs
FR2161757A1 (de) * 1971-10-29 1973-07-13 Siderurgie Fse Inst Rech
FR2190537A1 (de) * 1972-06-28 1974-02-01 Gen Electric
US4003229A (en) * 1972-09-06 1977-01-18 Nippon Steel Corporation Method for compensating tail end
FR2323463A1 (fr) * 1975-09-15 1977-04-08 Siemens Ag Procede et dispositif de laminage en continu

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1505873A (fr) * 1965-12-22 1967-12-15 Kloeckner Werke Ag Procédé permettant d'éviter les malformations de la tête de la matière laminéedans des trains de laminoir continus pour profilés et fers moyens
FR1514209A (fr) * 1965-12-28 1968-02-23 British Iron Steel Research Perfectionnements aux laminoirs
FR2161757A1 (de) * 1971-10-29 1973-07-13 Siderurgie Fse Inst Rech
FR2190537A1 (de) * 1972-06-28 1974-02-01 Gen Electric
US4003229A (en) * 1972-09-06 1977-01-18 Nippon Steel Corporation Method for compensating tail end
FR2323463A1 (fr) * 1975-09-15 1977-04-08 Siemens Ag Procede et dispositif de laminage en continu

Cited By (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
WO2018220296A1 (fr) 2017-05-31 2018-12-06 Lionel Vandenbulcke Composite à matrice céramique résistant à la corrosion et procédé de fabrication

Also Published As

Publication number Publication date
FR2399883A1 (fr) 1979-03-09
EP0000855B2 (de) 1987-04-29
DE2860375D1 (en) 1981-03-19
EP0000855B1 (de) 1981-01-28
FR2399883B1 (de) 1980-04-18

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