EP1466675A1 - Verfahren und Vorrichtung zur Dickenregelung eines gewalzten Produktes - Google Patents

Verfahren und Vorrichtung zur Dickenregelung eines gewalzten Produktes Download PDF

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Publication number
EP1466675A1
EP1466675A1 EP04300199A EP04300199A EP1466675A1 EP 1466675 A1 EP1466675 A1 EP 1466675A1 EP 04300199 A EP04300199 A EP 04300199A EP 04300199 A EP04300199 A EP 04300199A EP 1466675 A1 EP1466675 A1 EP 1466675A1
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EP
European Patent Office
Prior art keywords
cage
thickness
speed
cages
installation
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.)
Granted
Application number
EP04300199A
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English (en)
French (fr)
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EP1466675B1 (de
Inventor
Michel Abi-Karam
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.)
Clecim SAS
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VAI Clecim SA
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Filing date
Publication date
Application filed by VAI Clecim SA filed Critical VAI Clecim SA
Publication of EP1466675A1 publication Critical patent/EP1466675A1/de
Application granted granted Critical
Publication of EP1466675B1 publication Critical patent/EP1466675B1/de
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B21B37/18—Automatic gauge control
    • B21B37/20—Automatic gauge control in tandem mills
    • 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
    • B21B37/46—Roll speed or 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
    • B21B37/48—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
    • B21B37/58—Roll-force control; Roll-gap control

Definitions

  • the subject of the invention is a method for regulating the final thickness. a rolled product, at the exit of a tandem rolling installation, allowing in particular to optimize the productivity of such an installation by balancing the currents of the drive motors of the different cages, so as to allow an increase in the general rolling speed, without risk of overloading either motor.
  • the invention covers also a regulating device allowing the implementation of such process.
  • the invention is intended especially for the cold rolling of metal strips, for example steel, but can be applied in one way general, for any installation comprising several rolling stands operating in tandem for progressive thickness reduction of a product passing successively between the working rolls of said cages.
  • a rolling mill generally comprises at least two working rolls mounted inside a support cage and defining an air gap for the product to be laminated, the cage carrying means application of an adjustable clamping force between the cylinders.
  • Number of cylinders can vary depending on the type of rolling mill, for example duo, quarto, sexto Or other.
  • mass flow control also called “mass flow”.
  • the thickness of the strip at the constant is maintained at a constant value exit from the first cage, and on the other hand, the speed ratio between the first and last cage.
  • the thickness regulation at the exit of the first cage is generally ensured, on a modern rolling mill, by the clamping means which are controlled by a thickness gauge located downstream of this cage. Some more sophisticated systems also include a gauge thick upstream of this cage. Such a system for regulating the rolling mill tandem is commonly called “automatic gage control" or AGC.
  • a preset system for calculating rolling patterns taking into account all the characteristics of installation such as powers of drive motors, motor intensities and maximum speeds, maximum forces possible on rolling stands, etc.
  • This preset system should also take into account the geometrical and metallurgical characteristics of the product to be laminated and the product / rolling mill interface to establish parameters of rolling adapted to each format and type of strip making up the annual production of the rolling mill. These parameters are, in particular, the inlet thickness and the outlet thickness, possibly the temperature, the hardness, or the flow stress and the variation of this stress as the thickness is reduced, as well as the coefficient of friction of the sheet / cylinder interface.
  • This presetting system can be in the form of tables with multiple inputs giving the settings to be displayed for each cage in depending on the input parameters.
  • the operators enter the characteristics of the strips to be laminated in advance according to the planned production program and it is then enough to validate these data at the arrival of the head of the tape of the product considered in the rolling plant.
  • the means for rotating the cylinders are electric motors having a basic speed for which they give their nominal torque. Therefore, in the design of the rolling mill train, with an average thickness reduction for each cage.
  • the motors being, in general constructed to have the same basic speed, a speed reducer is often installed between the engine and the cage whose reduction ratio is different for each cage so that obtain the same speed on the high speed shaft of the reducer.
  • the object of the invention is to solve such a problem, and, in particular, to optimize the productivity of the installation, thanks to a process allowing improve the efficiency of the regulatory system without excessive complication of it.
  • the method according to the invention can, in fact, be implemented by simple and relatively inexpensive means that are simply added to the usual means of regulation.
  • the invention therefore relates, in general, to a method of regulation of the final thickness of a rolled product at the exit of a tandem rolling plant associated with a general system of control of the different cages determining a progressive increase in the speed of rotation of the cylinders as a function of the progressive variation from one cage to the next, and to a system for regulating the reduction of thickness and tension of the product in each space between two successive cages.
  • the regulation system realizes, in real time, dynamic balancing, between the different cages, torques applied in each cage on the working rolls, without significant disturbance of the final thickness of the product at the outlet of installation.
  • the regulatory system controls a variation of the rolling speed in at least one of the cages and changes the distribution of the thickness reduction accordingly and the staggering of the speeds between the different cages in order to distribute substantially equal, on all the driving means, the effort to apply for training the product at a given speed at the outlet of installation with maintenance of the final thickness at a determined value.
  • the overall thickness reduction to be carried out between the input and the output of the installation is distributed according to a diagram of rolling, by a presetting system.
  • this potential thickness defect is compensated in advance by ordering a variation in the opposite direction of the speed of all the cages located in upstream of said most loaded cage, capable of reducing the reduction of thickness made in said upstream cages, in order to carry out a transfer of load on the cages placed downstream of said most loaded cage.
  • the speed is increased rolling in the previous stand located immediately upstream, so to reduce the thickness of the product before it arrives in the most loaded.
  • Such an increase in speed in the previous cage determines a corresponding increase in speed in the most loaded which could cause a thickness defect at the outlet of installation during a transitional period.
  • this defect potential thickness is compensated in advance by ordering a increased rolling speed in cages still in upstream of said previous cage, so as to transfer loads on all the cages placed upstream of the most loaded cage, in increasing the thickness reduction carried out in each of them.
  • Such a process allows, after carrying out dynamic balancing loads applied to all cages, to increase the speed of rolling in one of the cages serving as a pivot cage, the regulation then varying the speeds of the other cages accordingly, so as to increase the speed of the product leaving the installation without disturbance of the final thickness and maintaining the dynamic balancing between all the cages.
  • the means for driving the cylinders are, generally, electric motors.
  • the regulation according to the invention enables dynamic balancing of currents without exceeding the rated current in each motor.
  • the invention also covers an improved regulation device. for the implementation of the method and comprising, for this purpose, a circuit in closed dynamic balancing loop, between the different cages, torques applied by the drive means of each cage to obtain the desired final thickness and keeping it at a value substantially constant.
  • the regulation device being associated, in a conventional manner, with a system for presetting the reduction in thickness allocated to each cage and the corresponding rolling speed
  • the dynamic balancing circuit according to the invention comprises means for correcting, on each cage, the speed setpoint determined by the preset system, so that modify the distribution of the thickness reduction between the different cages.
  • the balancing circuit dynamic includes a transient control module acting in closed loop on the drive means of the cylinders, so as to make, in advance, an additional correction to the speed during a transitional period of product advancement between a cage whose speed reference has been corrected and the next cage.
  • this transient control module is associated with a device for constantly monitoring the variation in product thickness during of its scroll between the entry and exit of the installation, which determines the instants of the start and end of the transitional period during which a additional correction is made to the speed setpoint of at least one of the cages.
  • Figure 1 shows schematically a rolling installation in tandem equipped with a thickness and traction control system according to the prior art.
  • FIG. 2 schematically represents a rolling installation in tandem equipped with a thickness and traction control system according to the invention.
  • FIG. 3 schematically illustrates the distribution of the currents of the motors of a tandem rolling installation according to the prior art.
  • FIG. 1 the whole of a tandem rolling plant with five rolling mill stands marked from 1 to 5.
  • Such an installation provided, for example for the cold rolling of sheets, works continuously, and is associated with a input traction device.
  • Each rolling stand for example of the quarto type, has two working cylinders T, T 'defining an air gap for the passage of the product to laminate B and bearing on two support cylinders S, S 'between which a rolling force is applied by clamping means such as hydraulic cylinders 11,21,31,41,51.
  • a rotary drive means such as an electric motor 12, 22, 32, 42, 52 applies, directly or indirectly, a rolling torque on at least one of the working cylinders T, T '.
  • the strength and torque of rolling depends on the nature of the product to be rolled, as well as the thickness reduction to be carried out in each cage.
  • the thickness of the product is kept constant at the exit from the cage 1.
  • a thickness gauge 13 which will ensure this function by action on the hydraulic clamping 11.
  • This regulation can also be improved by measuring the gross thickness h o of the strip B at the inlet of the installation using another thickness gauge 13 ′ installed at the entrance of the cage 1 and also acting on the hydraulic clamping 11 thereof.
  • a rolling scheme established in advance allows, in depending on the characteristics of the product to be laminated and the possibilities of the installation, to distribute the reduction in thickness between the different cages and the resulting staggering of speeds in order to respect the law of conservation of the masses.
  • a regulation system allows, from the indications given by tensiometers 15, 25, 35, 45 installed at the outlet, respectively, cages 1, 2, 3, 4 to act on the clamping means hydraulic, respectively 21, 31, 41, 51 of the following cages 2, 3, 4, 5 in order to correct the reduction in thickness and, therefore, the torque applied, so as to maintain constant traction in each space 10, 20, 30, 40 between two successive cages, without changing the relationship between the drive speeds of the respective cylinders.
  • the tensiometer 15 installed at the outlet of the cage 1 acts on the tightening 21 of the cage 2
  • the tensiometer 25 installed at the outlet of the cage 2 acts on the hydraulic clamping 31 of the cage 3 and so on. So we are assured that at all times the speed of the tape entering a cage is equal to the speed of the strip at the exit from the previous cage.
  • the presetting system determines, according to the rolling scheme, the thickness reduction to be carried out in each cage and the corresponding motor speed to satisfy equation (1).
  • the blood pressure monitor 15 installed in the inter-cage space 10 at the outlet of the cage 1 acts on the hydraulic clamping 21 of the cage 2
  • the tensiometer 25 installed in the space 20 at the outlet of the cage 2 acts on the tightening hydraulic 31 of the cage 3 and so on. Thanks to this regulation of traction, at all times the speed of the strip at the entrance of a cage is maintained equal to the speed of the strip at the exit from the previous cage.
  • all intermediate reductions are set by a preset system which determines the setpoints of intermediate thicknesses hi * of each cage on which the torque of rotation to be applied by each of the motor means 12, 22, 32, 42, 52.
  • Such a preset system can simply consist of preset tables indicating the intermediate thicknesses for each cage, but can also use a mathematical model capable of calculating the intermediate thicknesses h i * according to the characteristics of the product. to laminate, from databases periodically updated by measurements on the rolling mill.
  • equation (2) only allows the speeds to be adjusted in relative value with respect to each other.
  • the presetting system determines all the thickness setpoints h i * as a function of the characteristics of the product to be laminated and of the power available on the mill stands, with a certain degree of optimization which depends on the performance of the model. mathematics used.
  • the part of the control system of a tandem rolling mill that manages the set of speeds around that of a cage taken as a pivot and allows to control acceleration and deceleration ramps is commonly called the "master speed”.
  • cage 3 can be used as a pivot cage.
  • the speeds of the other cages are then calculated according to equations (2) and it comes assuming V 3 available for the general speed adjustment:
  • V 4 * h 3 * / h 4 * V 3 *;
  • V 2 * h 3 * / h 2 * .V 3 * and
  • V 1 * h 3 * / h 1 * .V 3 * is :
  • V 2 * h 3 * / h 2 * .
  • a final thickness control is ensured by the gauge 53 installed in output from cage 5, so as to correct the residual errors by modifying the speed of the last stand of the rolling facility, or both last cages.
  • the invention makes it possible to solve this problem by performing, at each moment, a dynamic balancing, between all the cages, couples to apply by motors.
  • the idea of the invention is to reduce in real time the reduction rate of the overloaded cage by modifying the speeds of the cages so as to change, by a device acting in a closed loop, all the values h i * without disturbing the keeping the outlet thickness h 5 at a constant value. If we consider the example given in Figure 3, it is possible to reduce the reduction of the cage 3, by increasing the outlet thickness h 3 *. Therefore, to maintain constant the final thickness h 5 at the outlet 50 of the installation, it is necessary to request more reduction in the cage 4 but, precisely, this has available power. This therefore results in a balancing of the currents by a transfer of power to the cages situated downstream of the overloaded cage.
  • a decrease in the speed setpoint of the cage 3 therefore causes an increase in the outlet thickness h 3 and, consequently, a decrease in the torque to be applied by the motor 13, which makes it possible to achieve the desired effect.
  • this potential thickness defect can be compensated for by anticipation by creating it in advance by a simultaneous gear change cages 1 and 2, in the example chosen.
  • the thickness h 3 has increased and, when the speed of the cage 3 is simultaneously lowered by replacing the speeds of the cages 1 and 2 to their initial value, the increased value of h 3 is retained and the flow h 3 V 3 is constant at the inlet of the stand 4.
  • the thickness h 4 is therefore kept constant as well as the outlet thickness h 5 .
  • the potential thickness defect resulting from this instantaneous variation in speed can be compensated for in advance so as to keep the outlet thickness h 5 constant, thanks to the method of the invention which makes it possible to control in real time and during the transient interval, instantaneous variations in thickness, by means of a temporary modification in the opposite direction of the speeds of the cages situated upstream of the overloaded cage.
  • Equations (2) show that this result can be obtained by increasing the speed of the cage 2. Indeed, since the thickness h 1 at the outlet of the cage 1 is kept constant by the regulation of the cage 1, a increasing the speed of the cage 2 will result in a decrease in the thickness h 2 , which is the aim sought. This increase in the reduction rate of thickness in the cage 2 causes an increase in the power consumed by the motor 12. There is therefore a transfer of power to the cages located upstream of the most loaded cage.
  • a reduction in the speed setpoint V 1 * will therefore induce a reduction in the thickness h 2 which is the aim sought. Then, when the reduced thickness h 2 reaches the cage 3, the thickness monitoring device, working in real time and in a closed loop, makes it possible to increase the speeds of the cages 1 and 2 at the same time to obtain the desired effect. without causing a variation in the thickness h 5 at the outlet of the rolling installation.
  • the invention thus makes it possible to carry out a power transfer from the overloaded cage on all the cages located upstream, while now constant the output thickness.
  • the invention also covers a device for implementing the process shown by way of example in FIG. 2.
  • This representation is purely schematic because such an installation can appeal, not only to conventional electronic circuit technologies using basic circuits of comparators, amplifiers, controllers, themselves comprising proportional action gain settings, integral and differential, but also to more recent technologies of digital control based on computers and microprocessors, from then on that they act in a closed loop, with response times short enough to execute an action in real time, with respect to other response times of other parts of the rolling plant.
  • Level 6 dynamic balancing includes a measurement of currents consumed by cage motors using transformers intensity 16, 26, 36 46, 56.
  • the dynamic balancing system 6 also contains comparison circuits capable of selecting the most loaded cage at all times, as well as the transfer function and the gains necessary for converting the load differences into a variation of the thickness setpoints. , which will be the new references of thickness h i * of the cages leading, in steady state, to the equilibrium of the currents.
  • Circuit 6 will generate the variations necessary to control the inter-cage thicknesses, using gain control controllers proportional, integral and differential, so as to reduce the reduction rates of the most loaded cages as described in the method of the invention.
  • the thickness section 7 comprises the circuits necessary for the transformation of variations in inter-cage thicknesses into instructions for speed of the drive motors, as well as those of the management of transients and, in particular, the band B advance monitoring system in the rolling plant.
  • transients 7 Taking into account product monitoring and variations in instructions developed by the dynamic balancing circuit 6, the control of transients 7 will develop transient and anticipatory variations in cage speed which will allow balancing of the currents, without causing even transitory variation of the outlet thickness. All of these circuits act in real time, in regulation and in closed loop between the measurement differences in motor currents, sort of taken as error signal at the input of the loop, and the variations in setpoints of the speeds of the drive motors, which constitute its signals exit.
  • Such a device, according to the invention, for balancing the currents of the drive motors operating in real time and in closed loop, can adapt to any device for regulating the outlet thickness and is part of integral to it.
  • the invention is not limited to the embodiment which has just been described as a simple example and can be applied to any set of rolling stands operating in tandem and comprising at least minus two successive cages.
  • the invention is not limited to cold rolling and can as well to apply to a tandem hot rolling mill such as for example the finishing train of a hot strip train.
  • the briefly described AGC control system can be of any type allowing control of the final thickness of the product the mine. Indeed, the fact that the invention is based on compliance with the law of "Mass flow”, it would be possible to imagine variants in the thickness regulation operation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
EP04300199A 2003-04-11 2004-04-08 Verfahren und Vorrichtung zur Dickenregelung eines gewalzten Produktes Expired - Fee Related EP1466675B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0304583 2003-04-11
FR0304583A FR2853570B1 (fr) 2003-04-11 2003-04-11 Procede et dispositif de regulation de l'epaisseur d'un produit lamine

Publications (2)

Publication Number Publication Date
EP1466675A1 true EP1466675A1 (de) 2004-10-13
EP1466675B1 EP1466675B1 (de) 2006-12-20

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EP04300199A Expired - Fee Related EP1466675B1 (de) 2003-04-11 2004-04-08 Verfahren und Vorrichtung zur Dickenregelung eines gewalzten Produktes

Country Status (6)

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US (1) US7086260B2 (de)
EP (1) EP1466675B1 (de)
JP (1) JP2005095975A (de)
DE (1) DE602004003734T2 (de)
ES (1) ES2278288T3 (de)
FR (1) FR2853570B1 (de)

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DE102007031333A1 (de) * 2007-07-05 2009-01-15 Siemens Ag Walzen eines Bandes in einer Walzstraße unter Nutzung des letzen Gerüsts der Walzstraße als Zugverringerer
DE102007050891A1 (de) * 2007-10-24 2009-04-30 Siemens Ag Auf der Streuung einer Istgröße eines Walzguts basierende Adaptierung eines Reglers in einem Walzwerk
JP4538088B2 (ja) * 2007-11-02 2010-09-08 新日本製鐵株式会社 板圧延機およびその制御方法
US8893537B2 (en) * 2007-11-07 2014-11-25 The Bradbury Company, Inc. Methods and apparatus to drive material conditioning machines
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EP2340133B2 (de) † 2008-10-30 2023-07-19 Primetals Technologies Germany GmbH Verfahren zum einstellen einer antriebslast für eine mehrzahl an antrieben einer walzstrasse zum walzen von walzgut, steuer- und/oder regeleinrichtung, speichermedium, programmcode und walzanlage
IT1400550B1 (it) * 2010-06-09 2013-06-11 Danieli Automation Spa Procedimento e dispositivo per il controllo dimensionale della sezione di un prodotto laminato.
AU2011311892B2 (en) * 2010-10-06 2016-03-17 The Bradbury Company, Inc. Apparatus and methods to increase the efficiency of roll-forming and leveling systems
EP2460597A1 (de) * 2010-12-01 2012-06-06 Siemens Aktiengesellschaft Verfahren zum Ansteuern einer Tandemwalzstrasse, Steuer- und/oder Regeleinrichtung für eine Tandemwalzstrasse, maschinenlesbarer Programmcode, Speichermedium und Tandemwalzstrasse
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Also Published As

Publication number Publication date
FR2853570A1 (fr) 2004-10-15
DE602004003734D1 (de) 2007-02-01
EP1466675B1 (de) 2006-12-20
US20040221633A1 (en) 2004-11-11
ES2278288T3 (es) 2007-08-01
DE602004003734T2 (de) 2007-10-04
FR2853570B1 (fr) 2005-07-01
US7086260B2 (en) 2006-08-08
JP2005095975A (ja) 2005-04-14

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