EP0004598B1 - Verfahren und Schaltungsanordnung zur Regelung der Längskraft zwischen Walzgerüsten einer kontinuierlichen Walzstrasse mit Einzelantrieben - Google Patents

Verfahren und Schaltungsanordnung zur Regelung der Längskraft zwischen Walzgerüsten einer kontinuierlichen Walzstrasse mit Einzelantrieben Download PDF

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Publication number
EP0004598B1
EP0004598B1 EP19790100851 EP79100851A EP0004598B1 EP 0004598 B1 EP0004598 B1 EP 0004598B1 EP 19790100851 EP19790100851 EP 19790100851 EP 79100851 A EP79100851 A EP 79100851A EP 0004598 B1 EP0004598 B1 EP 0004598B1
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EP
European Patent Office
Prior art keywords
roll
speed
rolled stock
longitudinal force
regulator
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
EP19790100851
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German (de)
English (en)
French (fr)
Other versions
EP0004598A3 (en
EP0004598A2 (de
Inventor
Ernst Wild
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.)
BBC Brown Boveri AG Germany
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BBC Brown Boveri AG Germany
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BBC Brown Boveri AG Germany filed Critical BBC Brown Boveri AG Germany
Publication of EP0004598A2 publication Critical patent/EP0004598A2/de
Publication of EP0004598A3 publication Critical patent/EP0004598A3/de
Application granted granted Critical
Publication of EP0004598B1 publication Critical patent/EP0004598B1/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

Definitions

  • the invention relates to a method and a circuit arrangement for regulating the longitudinal force in a rolling stock between rolling stands of a continuous rolling train with individual drives.
  • the rolling stock is simultaneously in several rolling stands and passes through them successively, with a certain pass reduction, i.e. a reduction in the material cross-section, taking place on each stand.
  • the individual rolling stands are mechanically coupled to one another via the rolling stock.
  • the speeds of the drives of the roll stands must be coordinated with one another in such a way that no tensile or compressive forces arise in the rolling stock, or that a predetermined tensile or compressive force is maintained.
  • Predetermined longitudinal forces must therefore be maintained once during the passage of the rolling stock, these longitudinal forces being able to have a specific value or the value zero.
  • Draft and pressure freedom is achieved with thin rolling stock by deliberately forming a rolling stock loop between two rolling stands.
  • a loop control adjusts the speeds of the roll stands so that the loop formation is retained. However, this is no longer possible with larger material cross-sections.
  • a known "synchronous device for the multi-motor drive of a continuous rolling mill” (DE-C-1 201 466) establishes a longitudinal force-free speed structure between the stands at the moment when the rolling stock enters the rolling stands, the armature currents being used as a reference value for the freedom from longitudinal forces in the rolling stock serve the respective drives.
  • a further known “device for coordinating the drive speeds of a multi-stand rolling mill with individual drives” uses changes in the drive torque on the already threaded stand as a measure of the longitudinal forces in the rolling stock.
  • the longitudinal force is influenced by means of a minimum tension control.
  • a stored value of the armature current (or of the torque) is compared with the current value and, depending on a difference, a correction value is given to the speed control of the second scaffold.
  • the minimum train control loop then shoots over the two speed-controlled drives and the rolling process in both stands.
  • an actuating signal for the speed sensor of one of the two stands is formed, it being possible to choose between an armature current or a torque control.
  • correlations between the speed in the rolling stock are mentioned, the torque control with the difficulty of detecting the torque is retained.
  • a disadvantage of this known method is that the measurement of the roller pressure force is very complex and existing systems are difficult to convert to it.
  • the quotient from the rolling torque to the roll pressure force is changed by material cross-section deviations, so that this quotient can only be used to a limited extent as a measure for a longitudinal force control.
  • the invention has for its object to develop a method for controlling the longitudinal force between rolling stands of a continuous rolling train with individual drives, with the help of which the speeds of the rolling stands can be coordinated with one another during the entire rolling stock pass so that no or a defined constant longitudinal force between the Scaffolding occurs.
  • This object is achieved in that the speed of the rolling stock at the outlet side of a roll stand and the peripheral speed or the speed of the roll of this roll stand are measured and a mathematical link value from these two values is used as a reference variable for controlling a predetermined longitudinal force.
  • the lead can be used as a mathematical logic value are used, where v represents the speed of the rolling stock on the outlet side of the roll stand and v u the peripheral speed of the roll of this roll stand.
  • the difference between the speed of the rolling stock on the outlet side of the roll stand and the peripheral speed of the roll of this roll stand can be used as the mathematical linkage value.
  • the quotient of the speed of the rolling stock on the outlet side of the roll stand and the peripheral speed of the roll of this roll stand can be used as the mathematical linkage value.
  • the rolling stock can be regulated independently of the temperature and material cross-section independently of the predetermined longitudinal force between the roll stands during the entire passage through the rolling train. This advantageously results in small cross-sectional tolerances of the rolling stock.
  • FIG. 1 shows a circuit arrangement according to the invention for regulating the longitudinal force between roll stands of a continuous rolling train with individual drives.
  • Two rolling stands 1 and 2 with individual drives 3 and 4, for example, are shown here from the rolling mill itself.
  • the rolling mill can have any number of other roll stands.
  • the rolling stock 5 passes through the individual roll stands 1 and 2, whereby it undergoes a reduction in the material cross-section and an increase in the outlet speed in each roll stand 1 and 2.
  • the material cross sections of the rolling stock 5 in front of the roll stand 1, after the roll stand 1 and after the roll stand 2 are denoted by A 0 , A 1 and A 2 .
  • the outlet speeds of the rolling stock 5 before the roll stand 1, after the roll stand 1 and after the roll stand 2 are denoted by v 0 , v 1 and v 2 .
  • the individual drives 3 and 4 have the speeds n and n 2 and have drive motors 6 and 7 and tachometer generators 8 and 9.
  • the roller peripheral speeds of the rollers of the individual drives 3 and 4 are denoted by v u1 and v u2 .
  • the drive motors 6 and 7 are fed via converters 10 and 11, respectively.
  • current transformers 12 and 13 are arranged between drive motor 6 and converter 10 or between drive motor 7 and converter 11.
  • 2 speed measuring devices 14, 15 and 16 are provided in front of the roll stand 1, after the roll stand 1 and after the roll stand 2.
  • the current transformers 12 and 13 are each connected to current regulators 17 and 18, the current signals I 1 and I 2 being supplied to the current regulators 17 and 18 with a negative sign.
  • the tachometer generators 8 and 9 are connected to speed regulators 19 and 20, respectively, with a negative supply of the corresponding signals ⁇ here speed signals n or n 2 ⁇ .
  • the outputs of the speed controllers 19 and 20 are connected to the inputs of the current controllers 17 and 18 on the output side, the current controllers 17 and 18 are fed to the converters 10 and 11.
  • the speed signals n and n 2 also act on the actual advance value generator 21 and 22.
  • these actual value formers 21 and 22 also have speed signals v 1 and v 2 from the speed measuring devices 15 and 16, respectively.
  • the signals x IST1 and IST2 the x Istwertsentner 21 and 22 store 23 and supplied to 24th Furthermore, the output signals x ist1 and x ist2 of the actual value generator 21 and 22 are negatively connected to addition points 25 and 26.
  • the memories 23 and 24 are connected on the output side to advance setpoint formers 27 and 28, respectively.
  • the output signals x soll1 and x soll2 of these setpoint formers 27 and 28 act on the addition points 25 and 26.
  • the setpoint formers 27, 28 each have a further input for correcting the input signals.
  • the output signals of the addition points 25 and 26 are fed to longitudinal force controllers 29 and 30, respectively.
  • the output values of the longitudinal force controllers 29 and 30 are at inputs of the speed controllers 19 and 20.
  • the radius r of the roll of the individual drive can be selected so that the same values for the Circumferential speed of the roller and the outlet speed of the rolling stock result from this roller. This procedure is of course also possible with non-calibrated rolls.
  • the outlet speed vy of the rolling stock 5 is determined by the speed measuring devices 14, 15, 16.
  • a contactless laser speed measuring device or also a contactless correlation speed measuring device can be used as an accurate speed measuring device.
  • a laser speed measuring device is known, for example, under the name Laser Velemeter der Meßmetallurgie, 5802 Wetter (Ruhr), Friedrichstrasse 40.
  • the speed is measured using the differential Doppler method, i.e. the Doppler effect, which is caused by moving material, is used.
  • a correlation speed measuring device is known, for example, from notice technique TU 22 der Trindel, Siege Social, 44, Rue de Portugalne, 75008 Paris.
  • the speed measurement is based on the principle of optical intercorrelation. It is assumed that the surface of a product has irregularities that can be detected and evaluated by an optical system, i.e. the characteristic of the intrinsic radiation of the rolling stock can be used for speed measurement.
  • the actual values of the lead x ist1 or x ist2 are formed by the lead actual value formers 21 or 22 from the input speed signals n or n 2 and the input run-out speed signals v 1 or v 2 .
  • the actual values of the advance x actual1 and x actual2 are , for example, from the formula calculated.
  • the actual values of the advance formed with the period prior to entry of the rolled material 5 in the subsequent roll stands x IST1 and x ist2 are supplied to the memories 23 and 24, respectively, and then used to further control the longitudinal forces in the rolled material 5 during the entire passage of the rolled product 5 by the rolling mill as setpoints for the lead x soll1 or x soll2 .
  • the memories 23 and 24 transmit these values of the advance x to the setpoint formers 27 and 28, wherein certain correction amounts can be added in the setpoint formers 27 and 28, which correspond to a predetermined longitudinal force.
  • the differences between the target values and the respective actual values are the overfeed x to x and formed st and 29 and 30, fed to the longitudinal force regulators.
  • the stored values for the lead x can be fed directly from the stores 23 and 24 to the addition points 25 and 26, respectively, if rolling is to be carried out without longitudinal force.
  • the longitudinal force regulators 29 and 30 and the downstream wire number regulators 19 and 20 set the advance changes in speed changes, ie a change in the speed quotient n, / n 2 is brought about.
  • the speed controllers 19 and 20, in addition to the correction signals of the longitudinal force controllers 29 and 30, have the speeds n 1 and n 2 negatively applied.
  • the output signals of the speed controllers 19 and 20 act on subordinate current controllers 17 and 18.
  • the current controllers 17 and 18 control the converters 10 and 11 depending on the flowing motor currents 1 1 , 1 2 and the output signals of the speed controllers 19 and 20 .
  • the insertion of the stitch removal formers 31 and 32 takes into account the fact that the lead x is dependent on the material cross section of the incoming rolling stock 5, that is to say changes in the material cross section are detected which occur during the passage of the rolling stock 5 through the rolling train and these changes in the material cross-section are included in the regulation.
  • the stitch decrease 8 can also be formulated
  • the stitch decrease is therefore dependent on the speeds of the rolling stock at the inlet into and at the outlet from the roller.
  • the stitch decrease ⁇ ⁇ is calculated by the stitch decrease formers 31 and 32.
  • the speed decrease signals v o and v l are applied to the stitch decrease generator 31, and the speed signals v l and v 2 are applied to the stitch decrease generator 32 on the input side.
  • the pass reduction 8y is fed to the corresponding store 23 or 24 in the period before the rolling stock 5 enters the respective subsequent rolling stand.
  • a change in the pass reduction 8 during the passage of the rolling stock 5 through the rolling mill is immediately transmitted to the lead setpoint formers 27 and 28, respectively. In this way, i.e. by correcting the advance value x dependent on the stitch acceptance, the interference of the stitch decrease 8 on the advance x, which is used as a measure of the longitudinal force, is eliminated.
  • Another possibility to include a change in the material cross section of the rolling stock 5 in the longitudinal force control is the direct measurement of the material cross section of the rolling stock 5 at the respective inlet into a roll stand 1 or 2. Since changes in cross section in the rolling process preferably result in a change in the length of a dimension of the Making rolling stock 5 noticeable can be deduced from the material cross section by contactless and continuous measurement of this length. So-called diode line cameras are suitable, for example, for measuring the length of a dimension of the rolling stock 5.
  • FIG. 2 shows an alternative circuit arrangement for regulating the longitudinal force between roll stands of a continuous rolling train with individual drives.
  • the output values of the longitudinal force controllers 29 and 30 are not directly at the inputs of the speed controllers 19 and 20, but are supplied to speed controllers 33 and 34.
  • speed controllers v 1 and V2 are also present in negated form.
  • the speed controllers 33 and 34 act on the speed controllers 19 and 20.
  • FIG. 2 The further wiring of the arrangement according to FIG. 2 is as described under FIG. 1.
  • an optional correction of the advance x by means of the stitch decrease generator 31 or 32 is possible (shown in dashed lines).
  • the speeds n 1 and n 2 of the roll stands 1 and 2 are regulated not only as a function of the advance x, but also as a function of the outlet speeds v and V2 of the rolling stock 5.
  • the speeds n 1 and n 2 are adjusted so that prescribed speed values v 1 and v 2 are set at the outlet of the rolling stock 5 from the roll.
  • the speed setpoint for the roll stand 1 is formed, for example, by a superimposed advance control in such a way that the measured advance value x and stored shortly before the rolling stock 5 enters the subsequent roll stand 2 is regulated to a value which corresponds to a predetermined longitudinal force between the roll stand 1 and corresponds to the subsequent mill stand 2.
  • This advance value can be corrected in the event of changing stitch decreases 8.
  • FIG. 3 and 4 show coupling possibilities between individual mill stand control arrangements with one another, namely FIG. 3 shows a coupling possibility for the circuit arrangement according to FIG. 1 and FIG. 4 shows a coupling possibility for the circuit arrangement according to FIG. 2.
  • FIG. 3 shows a continuous rolling train with the roll stands 1 and 2 and further roll stands 35 and 36.
  • Each roll stand has the control arrangement described in detail in FIG. 1. Of these control arrangements, only the speed regulators 19, 20 and further speed regulators 37, 38 and the longitudinal force regulators 29, 30 and further longitudinal force regulators 39, 40 are shown for simplification.
  • the individual control arrangements of the roll stands 1, 2, 35, 36 are connected to one another via couplers 41, 42, and 43. To connect the couplers, the connections between speed controllers and longitudinal force controllers each have addition points.
  • the output signal of the longitudinal force controller 29 is fed to an addition point 44, which is further connected on the input side to the coupler 41 and on the output side to the speed controller 19.
  • the coupler 41 is also located at an addition point 45 which is acted upon on the input side by signals from the longitudinal force controller 30 and by the coupler 42 and on the output side of the speed controller 20.
  • the coupler 42 is connected to an addition point 46, to which the output values of the longitudinal force controller 39 and coupler 43 are fed and which itself acts on the speed controller 37.
  • the coupler 43 is connected to an addition point 47, on the input side of the longitudinal force regulator 40 and on the output side of the wire number regulator 38.
  • FIG. 4 shows a coupling possibility between the individual mill stand control arrangements corresponding to FIG. 2.
  • FIG. 3 shows a coupling possibility between the individual mill stand control arrangements corresponding to FIG. 2.
  • the roll stands 1, 2, 35 and 36 and the speed controllers 33, 34, 48 and 49 associated with their control arrangements as well as the longitudinal force controllers 29, 30, 39 and 40 are shown.
  • the further circuit, not shown, is as described under FIG. 2.
  • the couplers 41, 42 and 43 are arranged between the control arrangements of the individual roll stands.
  • the longitudinal force controller 29 and the coupler 41 are connected to an addition point 50, which is located on the output side of the speed controller 33.
  • the coupler 41 is also connected to an addition point 51 which has the signals from the longitudinal force controller 30 and the coupler 42 applied to it on the input side and which is connected to the speed controller 34 on the output side.
  • the coupler 42 is also connected to an addition point 52 which receives the signals on the input side of longitudinal force controller 39 and coupler 43 are supplied and which is on the output side of the speed controller 48.
  • the coupler 43 is also connected to an addition point 53, which has the signal of the longitudinal force controller 40 on the input side and which acts on the speed controller 49 on the output side.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
EP19790100851 1978-04-10 1979-03-21 Verfahren und Schaltungsanordnung zur Regelung der Längskraft zwischen Walzgerüsten einer kontinuierlichen Walzstrasse mit Einzelantrieben Expired EP0004598B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2815341 1978-04-10
DE19782815341 DE2815341A1 (de) 1978-04-10 1978-04-10 Verfahren und schaltungsanordnung zur regelung der laengskraft zwischen walzgeruesten einer kontinuierlichen walzstrasse mit einzelantrieben

Publications (3)

Publication Number Publication Date
EP0004598A2 EP0004598A2 (de) 1979-10-17
EP0004598A3 EP0004598A3 (en) 1979-10-31
EP0004598B1 true EP0004598B1 (de) 1983-03-09

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Application Number Title Priority Date Filing Date
EP19790100851 Expired EP0004598B1 (de) 1978-04-10 1979-03-21 Verfahren und Schaltungsanordnung zur Regelung der Längskraft zwischen Walzgerüsten einer kontinuierlichen Walzstrasse mit Einzelantrieben

Country Status (4)

Country Link
EP (1) EP0004598B1 (enrdf_load_stackoverflow)
AT (1) AT371029B (enrdf_load_stackoverflow)
DE (1) DE2815341A1 (enrdf_load_stackoverflow)
ES (1) ES479449A1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3841367A1 (de) * 1988-12-08 1990-06-13 Asea Brown Boveri Prozessleitverfahren fuer eine kontinuierliche walzstrasse

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60102220A (ja) * 1983-11-07 1985-06-06 Mitsubishi Electric Corp タンデム圧延制御装置
AT381250B (de) * 1984-09-21 1986-09-10 Voest Alpine Ag Verfahren und vorrichtung zur regelung des walzgutdurchlaufes in kontinuierlichen walzstrassen

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1201466B (de) * 1959-10-02 1965-09-23 Licentia Gmbh Gleichlaufeinrichtung fuer den Mehrmotorenantrieb einer kontinuierlichen Walzenstrasse od. dgl.
DE1279589B (de) * 1962-04-03 1968-10-10 Max Planck Inst Eisenforschung Verfahren zur Regelung kontinuierlich arbeitender Walzenstrassen
DE1284922B (de) * 1963-03-14 1968-12-12 Schloemann Ag Verfahren zum Nachstellen von Walzgeruesten in kontinuierlichen Walzstrassen, insbesondere in Mittelstahlstrassen
DE1452051A1 (de) * 1964-06-30 1969-07-10 Schloemann Ag Steuerung von zwei oder mehr Walzgeruesten,insbesondere zum Walzen von Profilen
GB1158586A (en) * 1965-12-16 1969-07-16 British Iron Steel Research Improvements in and relating to Multi-Stand Mills
GB1163274A (en) * 1965-12-28 1969-09-04 British Iron Steel Research Improvements in and relating to Rolling Mills
SE333601B (enrdf_load_stackoverflow) * 1966-09-15 1971-03-22 Asea Ab
US3762194A (en) * 1972-06-28 1973-10-02 Gen Electric Constant speed driven continuous rolling mill
US3807208A (en) * 1972-07-31 1974-04-30 Westinghouse Electric Corp Interstand tension-compression control system
JPS5147146B2 (enrdf_load_stackoverflow) * 1972-09-06 1976-12-13
AU475854B2 (en) * 1972-09-06 1976-09-02 Mitsubishi Electric Corporation System for controlling rolling mills
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
FR2395086A1 (fr) * 1977-06-24 1979-01-19 Siderurgie Fse Inst Rech Procede de controle de la tension de produits epais lamines a chaud en prise entre deux cages successives
FR2399883A1 (fr) * 1977-08-08 1979-03-09 Siderurgie Fse Inst Rech Procede de prereglage d'un train continu a cages tandem pour le laminage a chaud de produits metalliques

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3841367A1 (de) * 1988-12-08 1990-06-13 Asea Brown Boveri Prozessleitverfahren fuer eine kontinuierliche walzstrasse

Also Published As

Publication number Publication date
DE2815341A1 (de) 1979-10-18
AT371029B (de) 1983-05-25
ATA255579A (de) 1982-10-15
DE2815341C2 (enrdf_load_stackoverflow) 1990-02-01
ES479449A1 (es) 1980-01-01
EP0004598A3 (en) 1979-10-31
EP0004598A2 (de) 1979-10-17

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