EP0041025B1 - Verfahren und Vorrichtung zum Walzen von Metall ohne Walzgutspannung - Google Patents

Verfahren und Vorrichtung zum Walzen von Metall ohne Walzgutspannung Download PDF

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Publication number
EP0041025B1
EP0041025B1 EP81400827A EP81400827A EP0041025B1 EP 0041025 B1 EP0041025 B1 EP 0041025B1 EP 81400827 A EP81400827 A EP 81400827A EP 81400827 A EP81400827 A EP 81400827A EP 0041025 B1 EP0041025 B1 EP 0041025B1
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EP
European Patent Office
Prior art keywords
order
stand
metal
circuit
rolling
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
EP81400827A
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English (en)
French (fr)
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EP0041025A1 (de
Inventor
Jacques Fromont
Marcel Plançon
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Jeumont Schneider SA
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Jeumont Schneider SA
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Publication date
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Application filed by Jeumont Schneider SA filed Critical Jeumont Schneider SA
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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
    • 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
    • B21B1/08—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 structural sections, i.e. work of special cross-section, e.g. angle steel
    • B21B1/12—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 structural sections, i.e. work of special cross-section, e.g. angle steel in a continuous process, i.e. without reversing stands
    • 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
    • B21B2275/00—Mill drive parameters
    • B21B2275/10—Motor power; motor current
    • B21B2275/12—Roll torque

Definitions

  • the present invention relates to the unconstrained rolling of metals and, more specifically, a method and a device for such rolling applicable to a continuous rolling train including at least two non-reversible cages whose respective drive motors are controlled by means of '' a circuit connected to a cruise control.
  • the speed sensors which must be used are generally either imprecise, such as the tachogenerators, or expensive, such as the electronic correlators, and are practically unusable for certain measurements, because of the ambient conditions of temperature.
  • this process does not take into account variations in the parasites of the rolling focus and in particular the volume flow rate of the rolled product. This results in a certain imprecision in the calculation of the slip value which is, therefore, maintained at a value such that each cage exerts a traction on the metal, it being understood that a very slight traction on the metal is entirely preferable to compression of the metal, or even at the sole risk of possible compression.
  • the object of the present invention is to obviate all of the aforementioned drawbacks.
  • the invention relates to a method for the unconstrained rolling of metals applicable to at least two successive non-reversible stands of a continuous rolling train comprising, for each stand, a torque regulator and a speed regulator acting respectively on a control circuit for the motor driving said cages, and comprising a first step, just before the introduction of the metal into the order cage (n + 1) during which the value of the rolling torque of the cage order (n) is determined and recorded, then a second step, starting from the introduction of the metal into the order cage (n + 1), during which the value of the rolling torque of the cage order (n) is kept constant by acting on the speed regulator of the order cage (n).
  • the second step continues until the moment preceding the introduction of the metal into the order cage (n + 2) and is followed by a third step continuing until the end of the operation.
  • FIG. 1 represents the block diagram of operation of two successive non-reversible stands of a continuous rolling train for long products, in accordance with the invention, and FIG. 2 represents more precisely the detail of one of the control units represented figure 1.
  • the non-reversible continuous rolling trains generally comprise several successive stands designated here symbolically by their date, for example (n), (n + 1) in which n is an integer at least equal to 1.
  • Each cage is provided with a drive motor, respectively 4 and 5, coupled to a pulse generator 6, 7, the frequency of which is proportional to the speed of rotation of a motor to which it is coupled.
  • an electric photo cell 8, 9 for example makes it possible to detect the immediate introduction of the metal into the cage, while a strain gauge 10, 11, placed in the cage, makes it possible to generate a signal representative of the rolling effort of the corresponding cage.
  • the drive motors 4, 5 are supplied from the mains line 12 by means of converters 13, 14, in particular with thyristors.
  • Each control unit for example 15 associated with the order cage (n) receives at its input terminal 20 the information relating to the control unit 16 associated with the immediately higher order cage (n + 1) , and, at its input terminals 21, 22, 23, 24 and 25, the signals respectively from the photoelectric cell 9 disposed at the input of the order cage (n + 1), of the gauge constraint 10 placed in the cage 2 of order (n), of the sensor 17 of the intensity of the current flowing in the converter 13 which it controls, of the pulse generators 6, 7 coupled to the order cages (n) and (n + 1).
  • a general speed reference signal 18 of all the cages is applied to the input terminal 26 of all the control units so as to uniformly vary the rolling speed of the entire train under consideration.
  • each control unit 15 has at least two output terminals 27 and 28, one connected to the downstream control unit and the other to the converter 13 which it controls.
  • control unit 15 of the order cage (n) is shown in more detail in FIG. 2 with the same references.
  • This control unit 15 essentially comprises, in addition to the logic 30, a speed regulator 31 the output of which is connected to a current regulator 32 itself connected to the input terminal 23 of the unit, a terminal which is connected to the sensor 17.
  • the regulator 32 is connected to the output terminal 28 of the unit 15, itself connected to the converter 13.
  • the signal from the pulse generator 6 is applied, via the input terminal 24 of the unit 15, to a converter 33 at the output of which is generated a digital signal representative of the frequency of the pulses.
  • This output is connected, on the one hand, to the speed regulator 31, on the other hand, to a circuit for determining the rolling torque 34 which is also connected to the output of the speed regulator 31, and finally, to a circuit divider 35 which reports the speeds of the order cages (n) and (n + 1), and to the other input of which is applied the digital signal from a converter 36 identical to the converter 33 but connected to the terminal input 25 of the unit 15 itself connected to the pulse generator 7 coupled to the motor 5 of the cage 3 of order (n + 1).
  • One of the outputs of the circuit 34 for determining the rolling torque is connected to one of the inputs of the speed regulator 31 by means of a loop for regulating the rolling torque of the order cage (n) .
  • This loop includes, in known manner, a first memory 37, a comparator 38 and a regulation circuit 39, operating during the first step of the method according to the invention, and a second memory 40 used during the second step of the method.
  • This torque determination circuit 34 also has an output connected to an input of a circuit 41 for developing a multiplier coefficient, another input of which is connected to the input terminal 22 of the unit 15, which even connected to the strain gauge 10 disposed in the order cage (n).
  • This processing circuit 41 is connected to a multiplier circuit 42, to the other input from which the signal from the divider circuit 35 is applied.
  • the output of the multiplier circuit 42 is connected to one of the inputs of the speed regulator 31 by means of a loop for regulating the flow of the rolled metal operating during the third step of the process.
  • This last loop includes a memory 43, a comparator 44 and a regulator 45.
  • the speed regulator 31 has an input terminal connected to the input terminal 26 of the unit 15 to which the general speed reference signal 18 is applied.
  • the logic input terminals 30 are respectively connected to the input terminals 24, 22, 21 and 20 of the unit 15 and to an output terminal of the circuit 34 for determining the rolling torque, while its terminals outputs are connected on the one hand to the output terminal 26 of the unit 15 connected to the control cage control unit (n - 1), and respectively to the control terminals of the memories 37 and 40 and of the circuit 39 of the torque regulation loop, as well as to the memory control terminals 43 and of regulator 45 of the flow regulation loop.
  • the operation of the device is as follows: the taking over of the cage 2 of order (n) is detected by the appearance of a rolling torque in the motor 4, or by means of the strain gauge 10.
  • the value of the rolling torque is determined by the circuit 34 and is recorded in the memory 37.
  • the precise moment can be determined for example, either by means of a photoelectric cell 9 disposed at the input of the cage 3 as shown in FIG. 1, or by means of a counter connected to the output of the pulse generator 6 it being understood that the distance separating the two successive cages is well known.
  • the value of the torque rolling in the cage 2 of order (n) is kept constant by means of the regulation loop connected to the speed regulator 31 controlled in a known manner by the logic 30.
  • the correction signal from comparator 38 is stored in memory 40, and remains permanently applied until the end of rolling or cruise control 31.
  • the logic 30 which has already controlled the succession of above operations, then orders the commissioning of the flow control loop until the end of the rolling carried out by the order cage (n). This flow regulation is obtained by applying a corrective term to the gear ratio.
  • This corrective term is a multiplying coefficient which has the form of the expression 1 + k in which k is a function, inter alia, of the force of separation of the cylinders of the cage considered, of the coefficient of yielding of this same cage, of radius of the cylinders and also the thickness of the slot between the cylinders, in particular at the neutral point.
  • This corrective term is developed by the circuit 41 and is applied to the ratio of the speeds of the cages of order (n) and (n + 1) by means of the multiplier circuit 42. The signal from this latter circuit 42 is then processed in a loop identical to a speed control loop for cages.
  • Such a process is favorably implemented for the rolling of long products such as rails, profiles, beams, it being understood that the product is simultaneously during rolling, engaged in several successive non-reversible cages.
  • the pulls or the compression of the product between two successive cages causes deformations in the desired profile of the finished product and the method according to the invention makes it possible to avoid such drawbacks.

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

Claims (3)

1. Verfahren zum beanspruchungsfreien Walzen von Metallen, welches anwendbar ist auf wenigstens zwei aufeinanderfolgende, nicht reversible Gerüste eines kontinuierlichen Walzwerks, das für jedes Gerüst einen Drehmomentregler und einen Geschwindigkeitsregeler umfaßt, die jeweils auf eine Schaltung zur Steuerung des Antriebsmotors der Gerüste einwirken, und mit einer ersten Stufe unmittelbar vor der Einführung des Metalls in das Gerüst der Ordnungszahl (n + 1), in deren Verlauf der Wert des Walzmomentes des Gerüstes der Ordnungszahl (n) bestimmt und gespeichert wird, ferner einer zweiten Stufe, die unmittelbar bei Einführung des Metalles in das Gerüst der Ordnungszahl (n + 1) beginnt und in deren Verlauf der Wert des Walzmomentes des Gerüstes der Ordnungszahl (n) konstant gehalten wird, indem auf den Geschwindigkeitsregler des Gerüstes der Ordnungszahl (n) eingewirkt wird, dadurch gekennzeichnet, daß die zweite Stufe fortgeführt wird bis zu dem Moment, welcher der Einführung des Metalls in das Gerüst der Ordnungszahl (n + 2) vorausgeht, und auf sie eine dritte Stufe folgt, die bis zum Ende des Walzvorganges des Gerüstes der Ordnungszahl (n) fortgesetzt wird und in deren Verlauf der Volumendurchsatz des Metalles in der Senkrechten jedes Gerüstes trotz eventueller Veränderungen des Querschnittes des genannten Metalles konstantgehalten wird, indem ein variabler Multiplikationskoeffizient auf das Signal angewendet wird, welches das Verhältnis der Geschwindigkeiten der Gerüste der Ordnungszahlen (n) und (n + 1) darstellt.
2. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1, dadurch gekennzeichnet, daß die Steuereinheit (15) des Umformers (13) für die Versorgung des Antriebsmotors (4) der Zylinder des Gerüstes (2) der Ordnungszahl (2) insbesondere eine Schaltung (34) zur Bestimmung des Walzmomentwertes des Gerüstes der Ordnungszahl (n), eine Teilerschaltung (35), welche ein Signal erzeugt, das das Geschwindigkeitsverhältnis zwischen dem Gerüst der Ordnungszahl (n) und dem Gerüst der Ordnungszahl (n + 1) darstellt und einen Geschwindigkeitsregler (31) für die Regelung der Geschwindigkeit des Motors des Gerüstes der Ordnungszahl (n) umfaßt, wobei die Schaltung (34) zur Bestimmung des Walzmomentes über einen ihrer Ausgangsanschlüsse mit dem genannten Geschwindigkeitsregeler (31) über eine Drehmomentregelschleife verbunden ist, und über einen weiteren Ausgangsanschluß mit einer Schaltung (41) zur Erzeugung des genannten Multiplikationskoeffizienten verbunden ist, wovon ein weiterer Eingangsanschluß mit einem Beanspruchungsmesser (10) verbunden ist, der in dem Gerüst der Ordnungszahl (n) angeordnet ist, wobei die Teilerschaltung (35) mit einer Multiplizierschaltung (42) verbunden ist, an die ferner das Signal angelegt ist, welches von der Schaltung (41) zur Erzeugung des genannten Multiplikationskoeffizienten abgegeben wird, und deren Ausgang mit dem genannten Geschwindigkeitsregler (31) über eine Regelschleife verbunden ist, welche dann auf ein Signal einwirkt, das den Volumendurchsatz des Metalles in dem Gerüst der Ordnungszahl (n) darstellt.
3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß zwei Impulsgeneratoren (6, 7), die an den Antriebsmotor (4, 5) des Gerüstes der Ordnungszahl (n) bzw. (n + 1) angekoppelt sind, mit den Eingangsanschlüssen der genannten Teilerschaltung (35) verbunden sind, das Verhältnis der Geschwindigkeiten der genannten Gerüste über zwei Umformer (33, 36) bestimmend, an deren Ausgang ein digitales Signal erzeugt wird, welches die Frequenz der von den genannten Generatoren (6, 7) erzeugten Impulse darstellt.
EP81400827A 1980-05-28 1981-05-25 Verfahren und Vorrichtung zum Walzen von Metall ohne Walzgutspannung Expired EP0041025B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8011796 1980-05-28
FR8011796A FR2483268A1 (fr) 1980-05-28 1980-05-28 Procede et dispositif pour le laminage sans ccontrainte de metaux

Publications (2)

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EP0041025A1 EP0041025A1 (de) 1981-12-02
EP0041025B1 true EP0041025B1 (de) 1985-01-09

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ID=9242404

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EP81400827A Expired EP0041025B1 (de) 1980-05-28 1981-05-25 Verfahren und Vorrichtung zum Walzen von Metall ohne Walzgutspannung

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US (1) US4408470A (de)
EP (1) EP0041025B1 (de)
JP (1) JPS5736007A (de)
DE (1) DE3168119D1 (de)
FR (1) FR2483268A1 (de)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1218614B (it) * 1987-05-15 1990-04-19 Denieli E C Officine Meccanich Procedimento di regolazione tiro nei treni di laminazione in continuo e treno di laminazione adottante tale procedimento
KR950009138B1 (ko) * 1987-10-09 1995-08-16 가부시끼가이샤 히다찌 세이사꾸쇼 판재 열간 압연 설비의 제어장치
US5101650A (en) * 1990-05-01 1992-04-07 Allegheny Ludlum Corporation Tandem mill feed forward gage control with speed ratio error compensation
AU7935594A (en) * 1993-10-18 1995-05-08 Jack-Eric Vandenbroucke Quick automated tool changer roll forming apparatus
DE4430550A1 (de) * 1994-08-27 1996-02-29 Licentia Gmbh Verfahren zur Steuerung von Bahngeschwindigkeiten in einer Einrichtung für den Transport oder die Streckung einer Materialbahn
US5806357A (en) * 1996-01-23 1998-09-15 Siemens Aktiengesellschaft System and method for rolling tapered slabs
WO1997027012A1 (en) * 1996-01-23 1997-07-31 Siemens Aktiengesellschaft System and method for rolling slabs
FR2788233B1 (fr) * 1999-01-11 2001-02-23 Alstom Procede de regulation des tractions/compressions dans un laminoir multicage a chaud et systeme de commande correspondant
RU2198753C1 (ru) * 2002-03-22 2003-02-20 Общество с ограниченной ответственностью "СЛОТ" Способ задания скоростного режима непрерывной группы прокатных клетей стана горячей прокатки металла с обеспечением минимального натяжения в межклетевых промежутках
US10363590B2 (en) 2015-03-19 2019-07-30 Machine Concepts, Inc. Shape correction leveler drive systems
IT201700107113A1 (it) * 2017-09-25 2019-03-25 Danieli Off Mecc Procedimento di regolazione del tiro di una barra e relativo dispositivo

Family Cites Families (11)

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Publication number Priority date Publication date Assignee Title
US3688532A (en) * 1970-11-24 1972-09-05 Antonio Vicente Silva Control system for tandem rolling mill based on the constant volume principle
JPS5334588B2 (de) * 1974-01-21 1978-09-21
JPS5121555A (en) * 1974-08-16 1976-02-20 Hitachi Ltd Katakoatsuen niokeru choryokuseigyosochi
JPS5224146A (en) * 1975-08-20 1977-02-23 Tokyo Shibaura Electric Co Device for controlling tension between stands in continuous rolling mill
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
JPS52116761A (en) * 1976-03-26 1977-09-30 Hitachi Ltd System for controlling thickness of rolled plate
FR2354154A1 (fr) * 1976-06-11 1978-01-06 Jeumont Schneider Procede pour le laminage sans contrainte de metaux et dispositif pour la mise en oeuvre de ce procede
JPS53134757A (en) * 1977-04-28 1978-11-24 Toshiba Corp Apparatus for controlling rolling mill
DE2834102C2 (de) * 1978-08-03 1982-11-18 Siemens AG, 1000 Berlin und 8000 München Vorrichtung zur Regelung der im Walzgut übertragenenZugkraft in einer m Gerüste enthaltenden Walzstraße
JPS5561306A (en) * 1978-11-01 1980-05-09 Mitsubishi Electric Corp Changing system for rolling schedule while running rolling stand
JPS55112111A (en) * 1979-02-23 1980-08-29 Hitachi Ltd Controller for continuous rolling mill

Also Published As

Publication number Publication date
JPS5736007A (de) 1982-02-26
US4408470A (en) 1983-10-11
FR2483268B1 (de) 1984-01-27
DE3168119D1 (en) 1985-02-21
FR2483268A1 (fr) 1981-12-04
EP0041025A1 (de) 1981-12-02

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