EP0350431B1 - Continuous casting method for production slabs compared to cast condition with a reduced thickness - Google Patents

Continuous casting method for production slabs compared to cast condition with a reduced thickness 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
adjustable
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)
French (fr)
Other versions
EP0350431A3 (en
EP0350431A2 (en
EP0350431B2 (en
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
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Filing date
Publication date
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Priority to DE3822939A priority Critical patent/DE3822939C1/en
Priority to DE3822939 priority
Priority to DE3907905A priority patent/DE3907905C2/en
Priority to DE3907905 priority
Application filed by Mannesmann AG filed Critical Mannesmann AG
Priority claimed from AT89730142T external-priority patent/AT90014T/en
Publication of EP0350431A2 publication Critical patent/EP0350431A2/en
Publication of EP0350431A3 publication Critical patent/EP0350431A3/en
Publication of EP0350431B1 publication Critical patent/EP0350431B1/en
Application granted granted Critical
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Publication of EP0350431B2 publication Critical patent/EP0350431B2/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B1/00Metal-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
    • B21B1/46Metal-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
    • B21B1/463Metal-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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B37/00Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/48Tension control; Compression control
    • B21B37/52Tension control; Compression control by drive motor control
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B37/00Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/58Roll-force control; Roll-gap control
    • B21B37/62Roll-force control; Roll-gap control by control of a hydraulic adjusting device
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12Accessories for subsequent treating or working cast stock in situ
    • B22D11/1206Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B2201/00Special rolling modes
    • B21B2201/14Soft reduction

Description

  • 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%.
  • In recent times, efforts have been made to adapt the thickness dimension of the continuously cast slab more and more to the finished product to be produced. This includes terms such as casting close to final dimensions, production of thin slabs or pre-strips. Here, a thin slab or a preliminary strip with a thickness between 40 and 50 mm is produced in the continuous caster. The pre-strips or thin slabs produced in this way have a cast structure. After leaving the continuous casting plant (transport rollers), the strand is cut to length and the sections of the thin slabs are fed to a compensating furnace and then rolled (see Stahl and Eisen 1988, No. 3, page 99ff).
  • A disadvantage of these processes is the considerable mechanical outlay and, in the case of thin slabs, the casting structure.
  • 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.
  • The object is achieved in a continuous casting method of the type mentioned by the characterizing features of claim 1.
  • According to the invention, 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).
  • In a further embodiment of the invention, 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.
  • In the above embodiments, 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.
  • In the case of roles set against attacks, this could mean that a role that is not sufficient has contact with the slab, "runs" in the limit speed without participating in the transport of the roll. In order to detect and rule out missing contact of a roll with the slab, i.e. slip, 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.
  • The invention will be explained in more detail using an exemplary embodiment and the drawings.
    • FIG. 1 shows the basic structure of a continuous caster,
    • FIG. 2 shows a control device according to the invention,
    • Figure 3 shows a modified control device (claim 5).
  • In the following description, the same parts are provided with the same reference numbers.
  • 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. Due to the deformation in the solidified area 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 control loop shown in FIG. 2 is used to carry out this procedure. 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 '. In the present case, 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.
  • In the case of a pair of rollers 15, 15 'following in the strand direction, the deformation takes place in the solidified part of the strand 3. Here, 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 '. With the 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. Depending on the operating conditions, 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. Should it be necessary to distribute the deformation work over several pairs of rollers due to an increased resistance to deformation of the strand, e.g. due to reduced temperature, 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.
  • The 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.
  • With the proposed control concept, 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. As already described above, 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.
  • Regarding the drive control, it should also be mentioned that each driven roller is driven by a controller acting as a speed controller. In a conventional continuous caster, the higher-level controller assigned to several roles has the task of compensating for minor disturbances. For this purpose, 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. With this arrangement, the influences of different roller diameters and other disturbing influences are corrected. The necessary corrector is only small.
  • With thin slab casting rolls in the area of deformation with solidified core (casting rolls), the correction controller has to calculate a considerably larger correction range. Here, 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.

Claims (5)

1. A continuous casting process for the production of slabs with a thickness reduced compared to the cast state, wherein steel is poured into a continuous-flow mould (1) and a billet which is partially solidified in cross-section is guided between pairs of rollers (9, 9'; 12, 12') and is withdrawn by means of driven rollers (5; 8), and individual rollers (9, 12, 15, 19) of pairs of rollers are hydraulically adjustable exerting a defor- mative influence upon the billet, characterised in that the rotation speed, the current consumption of the driven rollers and the contact pressure of the rollers are detected and conveyed to a respective regulating device (10, 10'; 13, 13', 17, 19, 19'), that each regulating device which determines the rotation speed of individual driven rollers is adjustable via a superordinate regulating device (20) in such manner that the final dimension and the withdrawal speed of the billet are determined by at least one pair of rollers (15, 15', 19, 19') which are adjustable against stop means, define the thickness of the billet, and exert a de- formative influence upon an already completely solidified part of the billet, and preceding and/or following rollers are adjusted in respect of their rotation speed and the current consumption of their drive means in dependence upon the change in shape of the billet produced by the rollers which are adjustable against stop means.
2. A process as claimed in Claim 1, characterised in that the superordinate regulating device is a computer by which the theoretical values to be imposed upon the individual regulating devices are determined from the detected measured values of the steel continuous casting plant and are defined in accordance with the lowest possible loading of the deforming rollers and the least possible contact pressures of the rollers.
3. A process as claimed in Claims 1 and 2, characterised in that the position of the end of the liquid phase (end of the solidification stage) is determined from the measured values, current consumption, reaction force of the billet and spacing between the rollers, and that the contact pressures of the adjustable rollers are adjusted in such manner that the end of the liquid phase is located in advance of at least one pair of rollers which is adjustable, against stop means, to a predetermined spacing.
4. A process as claimed in Claim 2, characterised in that the computer processes the theoretical values to be imposed upon the individual regulating device from the measured values of the continuous casting plant, such as casting speed, steel temperature and steel quality of the melt which is to be cast.
5. A process as claimed in Claim 1, characterised in that the rotation speed of the rollers is checked and connected on the basis of a mean value which is formed from the rotation speed of a first and third roller of driven, directly consecutive rollers assembled to form groups of three, where the rotation speed of the middle roller corresponds to this mean value within a tolerance range which is no greater than the difference between the rotation speeds of the first and third rollers.
EP89730142A 1988-07-04 1989-06-12 Continuous casting method for production slabs compared to cast condition with a reduced thickness Expired - Lifetime EP0350431B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
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
DE3822939 1988-07-04
DE3907905A DE3907905C2 (en) 1988-07-04 1989-03-08 Continuous casting process
DE3907905 1989-03-08

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT89730142T AT90014T (en) 1988-07-04 1989-06-12 Continuous method for the production of slabs with a thickness than reduced from the casting condition.

Publications (4)

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

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ID=25869813

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89730142A Expired - Lifetime EP0350431B2 (en) 1988-07-04 1989-06-12 Continuous casting method for production slabs compared to cast condition with a reduced thickness

Country Status (9)

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

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JPS62130759A (en) * 1985-12-02 1987-06-13 Sumitomo Metal Ind Ltd Method for controlling leveling roll for continuously cast steel ingot
FR2606137B1 (en) * 1986-10-30 1989-02-03 Clecim Sa Method and device for verifying the alignment of the rollers of a continuous casting installation
JPS63242452A (en) * 1987-03-30 1988-10-07 Nkk Corp Method for casting by light rolling reduction

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2456119C2 (en) * 2007-01-22 2012-07-20 Сименс Акциенгезелльшафт Method of guiding fused metal from casting machine chamber and casting machine

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

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