EP0350431B1 - Procédé de coulée continue pour la fabrication de brames avec une épaisseur réduite en présence d'état brut de coulée - Google Patents

Procédé de coulée continue pour la fabrication de brames avec une épaisseur réduite en présence d'état brut de coulée Download PDF

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Publication number
EP0350431B1
EP0350431B1 EP89730142A EP89730142A EP0350431B1 EP 0350431 B1 EP0350431 B1 EP 0350431B1 EP 89730142 A EP89730142 A EP 89730142A EP 89730142 A EP89730142 A EP 89730142A EP 0350431 B1 EP0350431 B1 EP 0350431B1
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EP
European Patent Office
Prior art keywords
rollers
billet
speed
strand
rotation speed
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 - Lifetime
Application number
EP89730142A
Other languages
German (de)
English (en)
Other versions
EP0350431A2 (fr
EP0350431B2 (fr
EP0350431A3 (fr
Inventor
Armin Dipl.-Ing. Burau
Rainer Lenk
Hans-Georg Dipl.-Ing. Eberhardt
Manfred Pfluger
Hans Jürgen Dipl.-Ing. Ehrenberg
Werner Dr.Ing. Rahmfeld
Hans Uwe Dipl.-Ing. Franzen
Lothar Dipl.-Ing. Parschat
Fritz-Peter Dr.-Ing. Pleschiutschnigg
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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
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Priority claimed from DE3822939A external-priority patent/DE3822939C1/de
Application filed by Mannesmann AG filed Critical Mannesmann AG
Priority to AT89730142T priority Critical patent/ATE90014T1/de
Publication of EP0350431A2 publication Critical patent/EP0350431A2/fr
Publication of EP0350431A3 publication Critical patent/EP0350431A3/fr
Application granted granted Critical
Publication of EP0350431B1 publication Critical patent/EP0350431B1/fr
Publication of EP0350431B2 publication Critical patent/EP0350431B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/14—Plants for continuous casting
    • 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
    • B21B1/46—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 metal immediately subsequent to continuous casting
    • B21B1/463—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 metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
    • 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
    • B21B37/62—Roll-force control; Roll-gap control by control of a hydraulic adjusting device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/20—Controlling or regulating processes or operations for removing cast stock
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2201/00—Special rolling modes
    • B21B2201/14—Soft reduction

Definitions

  • the invention relates to a continuous casting method according to the preamble of claim 1.
  • Slabs are the starting material for the production of sheets and strips. If slabs with a thickness of> 100 mm are produced in continuous casting plants, segregation problems arise. According to DE-OS 24 44 443, the problem is to be solved in that, within the continuous casting installation, a deformation is exerted on the strand within the solidification section, as shortly before the solidification point as possible, with a degree of reduction of 0.1 to 2%.
  • the invention is based on the object of specifying a method by means of which a continuous casting system is already used to provide a product with a high proportion (80 80%) of roll structure which can be coiled with the thickness dimension leaving the casting system.
  • the invention is based on a continuous casting process for the production of slabs with a reduced thickness compared to the cast state.
  • Steel is poured into a continuous mold and a strand that has partially solidified in cross-section is drawn off from it.
  • the strand is guided between pairs of rollers. Some pairs of roles can be combined into segments.
  • Some of the rollers can be driven for the strand transport of the strand.
  • the rollers or the segments can be hydraulically adjusted against the strand.
  • the rollers or some of the rollers or roller segments, both within the solidification section and in the area of the solidified strand, have a deforming effect on the strand.
  • the degree of deformation is either adjustable via the hydraulic pressure of the adjusting device or limited by stops (spacers) on the rollers.
  • each adjustable, driven roller is now assigned a controller which detects the speed and the contact pressure of the rollers and the current consumption of the roller drives and controls them according to predetermined target values; Furthermore, each controller is connected to a higher-level controller, the position of the bottom of the sump (end of the solidification section) being known as the actual value.
  • This controller adjusts the individually adjustable roller pairs and the strand speed in such a way that the bottom of the sump lies in or just before a pair of rollers, which can be adjusted against its stops against stops and thus the final dimension and the pull-off speed of the strand, as well as the degree of deformation in the solidified state Area.
  • the position of the bottom of the sump can be seen from the different speeds, the current consumption of the drives of two adjacent pairs of rollers and the reaction forces of the strand, since the speed of the strand changes between the solidification section and the solidified area during strand deformation.
  • the reaction force of the strand can be determined from the differences between the deformation force - e.g. can be determined by measuring the pressure of the hydraulic medium or using pressure transducers on the roller journals - and the deformation work performed (adjustment of the rollers).
  • the higher-level controller also receives information about the steel temperature, quality, take-off speed of the strand and the position of the rollers from the machine data of the continuous casting installation due to the freely occurring stick removal in the respective roller pairs. This data is also incorporated into the setpoints of the individual controllers.
  • the advantages of the control method according to the invention can be seen in a freely adjustable distribution of the strand deformation over the area of the solidification section and the solidified area, a quality-adapted deformation treatment of the strand, less stress on the rolls causing the deformation and the production of a product with a high degree of roller structure. The latter also improves the mechanical properties of the end product compared to conventional manufacturing methods.
  • the speed of each roller was increased or decreased until the current consumption of all drives is the same. This is achieved by the higher-level controller, which forms the average current value from the sum of the motor currents of the individual drives. Deviations in the motor currents of the drives from the mean value are compensated for by correcting the speed setpoint of each controller.
  • the speed of the rolls can be checked and corrected according to a further embodiment of the invention on the basis of an average value which is formed from the speed of a first and third roll of Triplets combined, driven, immediately successive roles, the speed of the middle role corresponding to this mean within a tolerance range that is not greater than the difference in speed of the first and third roles.
  • Liquid steel is poured into a mold 1 with a thickness of approx. 60 mm (distance of the broad sides of the mold from one another).
  • the mold 1 is followed by rollers 2 for supporting the still thin strand shell of the partially solidified strand 3.
  • the rollers 2 are followed by a section in which the rollers are combined to form a segment 4.
  • Individual rollers 5 of the segment 4 are driven.
  • the rollers 5 can be adjusted against each other individually or as a segment by means of hydraulic cylinders 6. Even under the resulting deformation of the strand, the sump tip is held in the area of segment 4 by influencing the speed of the rollers.
  • This section of the roller guide (segment 4) is followed by a section 7 in which rollers 8 are driven and can be adjusted against one another to a certain extent against stops, not shown, in order to achieve a certain decrease in the thickness of the strand and a certain final thickness of the strand.
  • the speeds of the rollers change in accordance with the embroidery acceptance carried out between the individual pairs of rollers. Since the rollers are only spaced to the final dimension of approx. 20 to 15 mm, the speed must be able to be varied over a wide range.
  • the speeds of the individual rollers are determined and set from the current consumption of the drives of the respective roller, the hydraulic pressure and the distance between the rollers.
  • the strand 3 emerging from the mold reaches a first pair of rollers 9, 9 '.
  • the roller 9 can be adjusted by means of a hydraulic cylinder 11.
  • a roller 10 is assigned to the roller 9, which detects the pressure of the hydraulic medium and compares it with a predetermined target value and adjusts the contact pressure of the roller 9 to the strand 3 in accordance with a target value 1.
  • the speed is determined from the roller 9 'and fed to a controller 10' which regulates the speed according to a desired value.
  • a deformation of the strand 3 can be controlled via the contact pressure of the roller 9. After a first slight deformation, the strand 3 reaches a next pair of rollers 12, 12 '.
  • This pair of rollers 12, 12 ' also has adjusting means 11 and its own controllers 13, 13', corresponding to the pair of rollers 9, 9 '.
  • the roller pairs 9, 9 'and 12, 12' are in the area of the solidification section, that is, before the solidification point (sump tip) 14, so that the rollers 9, 9 'and 12, 12' are operated at the same speed.
  • the deformation takes place in the solidified part of the strand 3.
  • the deformation work performed is determined via a displacement sensor 16 and fed to the controller 17.
  • the deformation work is also controlled here via the contact pressure of the hydraulic cylinder 11.
  • the deformation that occurred in the solidified region of the strand 3 is noticeable in an elongation of the strand and thus an increase in the strand speed in the further pair of rollers 18, 18 '.
  • the final thickness of the strand 3 leaving the system is determined at the same time.
  • the final thickness can take place both with the aid of the hydraulic cylinder 11 and a controller 19 and also by means of spacers (not shown) which define the distance between the rollers 18, 18 'from one another.
  • a controller 19 'ensures the necessary speed of the pair of rollers 18, 18'.
  • All controllers 10, 10 ', 13, 13', 17 and 19, 19 ' are connected to a higher-level controller 20. All relevant data of the respective casting, such as steel analysis, steel temperature and casting speed, as well as the data recorded via the individual controllers, such as contact pressure of the rolls, speed of the rolls and current consumption of the roll drives, are recorded in the controller 20 and returned to the respective individual controllers as setpoints.
  • the setpoints specified for the individual controllers can be modified in such a way that with a given final thickness of the strand, the deformation work is distributed as evenly as possible with the least possible load on the individual rollers; the higher-level controller also sets the speeds depending on the degree of deformation and the size of the solidified area and the Area of the solidification section. It is possible to keep the bottom of the sump in a certain area of the system depending on the final thickness and the starting dimension of the strand. This makes it possible to produce a strand that has a high degree of roll structure.
  • the specified regulation also makes it possible to carry out the deformation work within the guide section in which the rollers can be set against stops and over a solidified area extend the strand to divide.
  • the final dimension of the strand can already be achieved with a first pair of rollers.
  • Roller pairs following in the strand withdrawal direction are then regulated in the sense of an agreement of the rotational speed with this roller pair determining the final dimension, that is to say kept constant.
  • one of the following pairs of rollers takes over the "thickness determination" of the strand, so that upstream roller pairs not against the stops, but because of the Regulation are freely "distanced". The speed of upstream or downstream roles is accordingly.
  • FIG. 3 shows a schematic diagram for the control device according to claim 5, which has the advantage that slippage of a driven roller on the strand is avoided and the roller is kept in its intended use by the control circuit.
  • the system is also able to compensate for deviations in the roll diameter and to automatically adjust to a new nominal speed.
  • rollers n, n + 1, n + 2 of a group of three are each driven by motors M, the speed being determined by the tachometer TD.
  • a role that is not in contact with the slab, that is to say has slip can run into the limit speed.
  • a slipping roll can on the one hand cause surface damage, and on the other hand it is possible that the re-engaging roll briefly accelerates the strand so that the strand is torn from the mold. If you only look at the speeds of three adjacent rolls, the middle roll can assume the speed of the first or last roll depending on the degree of deformation. The speed can never, given contact with the slab, be faster than the last roll of the triple and never slower than the first roll of the triple. A blocking role will run into the current limit and will be reported as faulty.
  • the slipping roll is not recognized by the individual controller as being involved in the transport, but if the speed of the middle roll is greater than that of the last roll of the group of three, it can only have lost contact with the slab, it has slip.
  • a slipping role which is recognized by the speed comparison, can therefore be reported as faulty, it can also be reduced to the average speed of the group of three by intervening in the controller, so that when the contact is restored, it can take part in the transport again.
  • the rollers are adjusted or the roller spacing is adjusted using hydraulic cylinders.
  • the necessary pressure is generated in a pressure-controlled hydraulic station.
  • the maximum pressure is only determined by the strength of the mechanical part of the system.
  • a path measurement must be installed on each hydraulic cylinder. Only with the help of distance measurements can jamming of the employment and other errors be recognized.
  • the adjustment is controlled by servo valves.
  • the distance measurement serves as an actual value transmitter.
  • each driven roller is driven by a controller acting as a speed controller.
  • the higher-level controller assigned to several roles has the task of compensating for minor disturbances.
  • the mean value is formed from the sum of the motor currents of each drive.
  • the deviation of the motor current of each roll from the mean value is applied to the setpoint as a correction variable.
  • the correction controller has to calculate a considerably larger correction range.
  • each run is recalculated based on the last correction value. Since the correction of the speed can be very large depending on the difference between the individual current and the mean current value, the motor can go into the limit speed when the roll is slipping (not in contact with the line). These slipping roles are then recognized by the monitoring.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Metal Rolling (AREA)

Claims (5)

1. Procédé de coulée continue pour fabriquer des brames ayant une épaisseur réduite par rapport à l'état de coulée, de l'acier étant coulé dans une coquille continue (1) et une barre, partiellement solidifiée en section transversale, étant guidée entre des paires de rouleaux (9,9',12,12'), et extraite au moyen de rouleaux entraînés (5;8), et des rouleaux individuels (9,12,15,18) de paires de rouleaux étant réglables hy- drauliquement pour déformer la barre, caractérisé en ce que la vitesse de rotation, la consommation de courant des rouleaux entraînés, et la pression de pressage des rouleaux sont détectées et amenées, chacune, à un régulateur (10,10',13,13',17,19,19'), en ce que chaque régulateur, déterminant la vitesse de rotation des rouleaux entraînés individuels, peut être réglé par un régulateur associé (20), de sorte que la cote finale et la vitesse d'extraction de la barre sont déterminées par au moins une paire de rouleaux (15,15',18,18') réglables contre des butées, déterminant l'épaisseur de la barre, et agissant en déformant une partie déjà complètement solidifiée de la barre, et en ce que la vitesse de rotation de rouleaux disposés en amont et/ou en aval et la consommation de courant de leurs entraînements sont réglées selon la modification de forme de la barre, engendrée par les rouleaux réglables contre des butées.
2. Procédé selon la revendication 1, caractérisé en ce que le régulateur associé est un calculateur qui, à partir des valeurs de mesure détectées de l'installation de coulée continue d'acier, détermine les valeurs de consigne à affecter aux régulateurs individuels et les prédéfinit dans le sens d'une charge la plus faible possible des rouleaux de déformation et de très faibles pressions de pressage des rouleaux.
3. Procédé selon les revendications 1 et 2, caractérisé en ce que, à partir des valeurs de mesure, consommation de courant, force de réaction de la barre, et écartement des rouleaux, la position de la fin de l'étendue de solidification est déterminée et les pression de pressage des rouleaux réglables sont réglées de sorte que la fin de l'étendue de solidification se trouve avant au moins une paire de rouleaux réglables à un écartement prédéterminé contre des butées.
4. Procédé selon la revendication 2, caractérisé en ce que le calculateur détermine, à partir des valeurs de mesure de l'installation de coulée continue, comme la vitesse de coulée, la température de l'acier, et la qualité de l'acier du bain de fusion à couler, les valeurs de consigne à affecter aux régulateurs individuels.
5. Procédé selon la revendication 1, caractérisé en ce que la vitesse de rotation des rouleaux est surveillée et corrigée en référence à une valeur moyenne, qui est formée à partir de la vitesse de rotation d'un premier rouleau et d'un troisième rouleau de rouleaux directement successifs, entraînés, et rassemblés en groupes de trois, la vitesse de rotation du rouleau central corrrespondant à cette valeur moyenne à l'intérieur d'une zone de tolérance qui n'est pas plus grande que la différence des vitesses de rotation des premier et troisième rouleaux.
EP89730142A 1988-07-04 1989-06-12 Procédé de coulée continue pour la fabrication de brames avec une épaisseur réduite en présence d'état brut de coulée Expired - Lifetime EP0350431B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89730142T ATE90014T1 (de) 1988-07-04 1989-06-12 Stranggiessverfahren fuer die erzeugung von brammen mit einer gegenueber dem gusszustand verringerten dicke.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3822939 1988-07-04
DE3822939A DE3822939C1 (en) 1988-07-04 1988-07-04 Continuous casting method for the production of slabs with a reduced thickness relative to the cast condition
DE3907905 1989-03-08
DE3907905A DE3907905C2 (de) 1988-07-04 1989-03-08 Stranggießverfahren

Publications (4)

Publication Number Publication Date
EP0350431A2 EP0350431A2 (fr) 1990-01-10
EP0350431A3 EP0350431A3 (fr) 1991-03-27
EP0350431B1 true EP0350431B1 (fr) 1993-06-02
EP0350431B2 EP0350431B2 (fr) 2000-08-02

Family

ID=25869813

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89730142A Expired - Lifetime EP0350431B2 (fr) 1988-07-04 1989-06-12 Procédé de coulée continue pour la fabrication de brames avec une épaisseur réduite en présence d'état brut de coulée

Country Status (9)

Country Link
US (1) US5018569A (fr)
EP (1) EP0350431B2 (fr)
JP (1) JP3023114B2 (fr)
KR (1) KR970001551B1 (fr)
CN (1) CN1048669C (fr)
BR (1) BR8903264A (fr)
CA (1) CA1330615C (fr)
DE (2) DE3907905C2 (fr)
ES (1) ES2042057T5 (fr)

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DE3907905C2 (de) 1999-01-21
CN1039370A (zh) 1990-02-07
ES2042057T5 (es) 2000-11-16
CA1330615C (fr) 1994-07-12
EP0350431A2 (fr) 1990-01-10
US5018569A (en) 1991-05-28
DE58904550D1 (de) 1993-07-08
KR970001551B1 (ko) 1997-02-11
EP0350431B2 (fr) 2000-08-02
KR900001443A (ko) 1990-02-27
BR8903264A (pt) 1990-02-13
ES2042057T3 (es) 1993-12-01
EP0350431A3 (fr) 1991-03-27
JP3023114B2 (ja) 2000-03-21
DE3907905A1 (de) 1990-09-13
JPH0252159A (ja) 1990-02-21
CN1048669C (zh) 2000-01-26

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