EP0350431B2 - 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
EP0350431B2
EP0350431B2 EP89730142A EP89730142A EP0350431B2 EP 0350431 B2 EP0350431 B2 EP 0350431B2 EP 89730142 A EP89730142 A EP 89730142A EP 89730142 A EP89730142 A EP 89730142A EP 0350431 B2 EP0350431 B2 EP 0350431B2
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EP
European Patent Office
Prior art keywords
rollers
speed
continuous casting
adjustable
rotation
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EP89730142A
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German (de)
French (fr)
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EP0350431B1 (en
EP0350431A2 (en
EP0350431A3 (en
Inventor
Armin Dipl.-Ing. Burau
Hans-Georg Dipl.-Ing. Eberhardt
Hans Jürgen Dipl.-Ing. Ehrenberg
Hans Uwe Dipl.-Ing. Franzen
Rainer Lenk
Lothar Dipl.-Ing. Parschat
Manfred Pfluger
Fritz-Peter Dr.-Ing. Pleschiutschnigg
Werner Dr.Ing. Rahmfeld
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Vodafone GmbH
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Mannesmann AG
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Priority to DE3822939 priority Critical
Priority to DE3822939A priority patent/DE3822939C1/en
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
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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

Die Erfindung betrifft ein Stranggießverfahren gemäß Gattungsbegriff des Anspruches 1.The invention relates to a continuous casting method according to the generic term of Claim 1.

Brammen sind das Ausgangsmaterial für die Erzeugung von Blechen und Bändern. Werden Brammen mit einer Dicke von > 100 mm in Stranggießanlagen erzeugt, treten Seigerungsprobleme auf. Gemäß der DE-OS 24 44 443 soll das Problem dadurch gelöst werden, daß innerhalb der Stranggießanlage auf den Strang innerhalb der Erstarrungsstrecke, möglichst kurz vor dem Durcherstarrungspunkt, eine Verformung ausgeübt wird mit einem Reduktionsgrad von 0,1 bis 2 %.Slabs are the starting material for the production of sheet metal and Tapes. Are slabs with a thickness of> 100 mm in Continuous casting plants produced, segregation problems occur. According to the DE-OS 24 44 443 the problem is to be solved by the fact that within the continuous caster on the strand within the solidification section, Deformed as soon as possible before the solidification point with a degree of reduction of 0.1 to 2%.

In jüngster Zeit ist man bestrebt, die Dickenabmessung der stranggegossenen Bramme immer mehr dem zu erzeugenden Fertigprodukt anzupassen. Hierfür stehen Begriffe wie endabmessungsnahes Gießen, Erzeugung von Dünnbrammen oder Vorbändern. Hierbei wird in der Stranggießanlage eine Dünnbramme bzw. ein Vorband mit einer Dicke zwischen 40 bis 50 mm erzeugt. Die so erzeugten Vorbänder oder Dünnbrammen weisen eine Gußstruktur auf. Nach Verlassen der Stranggießanlage (Transportrollen) wird der Strang abgelängt und die Teilstücke der Dünnbrammen werden einem Ausgleichsofen zugeführt und anschließend gewalzt (s. Stahl u. Eisen 1988, Nr. 3, Seite 99ff).In recent times, efforts have been made to measure the thickness of the continuously cast slab more and more the finished product to be produced adapt. This includes terms such as casting close to final dimensions, Production of thin slabs or pre-strips. Here is in the Continuous caster a thin slab or a preliminary strip with a thickness generated between 40 to 50 mm. The opening tapes or Thin slabs have a cast structure. After leaving the Continuous caster (transport rollers) the strand is cut to length and the Portions of the thin slabs are fed to a compensation furnace and then rolled (see Stahl and Eisen 1988, No. 3, page 99ff).

Nachteilig bei diesen Verfahren ist der erhebliche maschinentechnische Aufwand und im Fall der Dünnbrammen außerdem das Gußgefüge. The disadvantage of this method is the considerable mechanical engineering Effort and in the case of thin slabs also the casting structure.

Der Erfindung liegt die Aufgabe zugrunde ein Verfahren anzugeben, mit dem bereits mit der Stranggießanlage ein Produkt mit hohem Anteil (≧ 80 %) an Walzgefüge zur Verfügung gestellt wird, das mit der die Gießanlage verlassender Dickenabmessung coilfähig ist.The invention has for its object to provide a method with a product with a high proportion (≧ 80 %) is made available to the roll structure with which the casting plant leaving thickness dimension is coilable.

Die Erfindung geht aus von einem Stranggießverfahren für die Erzeugung von Brammen mit einer gegenüber dem Gußzustand verringerten Dicke. Dabei wird Stahl in eine Durchlaufkokille gegossen und aus dieser ein im Querschnitt teilweise erstarrter Strang abgezogen. Der Strang wird zwischen Rollenpaaren geführt. Einige Rollenpaare können dabei zu Segmenten zusammengefaßt werden. Für den Strangtransport des Stranges sind einige der Rollen antreibbar. Die Rollen oder auch die Segmente sind gegen den Strang hydraulisch anstellbar. Die Rollen bzw. einige der Rollen bzw. Rollensegmente, sowohl innerhalb der Erstarrungsstrecke als auch im Bereich des durcherstarrten Stranges wirken verformend auf den Strang ein. Der Verformungsgrad ist entweder über den Hydraulikdruck der Anstelleinrichtung einstellbar oder durch Anschläge (Distanzhalter) an den Rollen begrenzt.The invention is based on a continuous casting process for production of slabs with a reduced thickness compared to the as-cast state. Here steel is poured into a continuous mold and an in Cross-section of partially solidified strand subtracted. The strand will performed between pairs of rollers. Some pairs of roles can Segments are summarized. For the strand transport of the strand some of the rollers can be driven. The roles or the segments are hydraulically adjustable against the strand. The roles or some of the Rolls or roll segments, both within the solidification section and also in the area of the solidified strand have a deforming effect on the Strand one. The degree of deformation is either via the hydraulic pressure Adjusting device adjustable or by stops (spacers) limited to the roles.

Die gestellte Aufgabe wird bei einem Stranggießverfahren der einleitend genannten Art durch die Kennzeichnenden Merkmale des Anspruche 1 gelöst.The task is introduced in a continuous casting process mentioned type solved by the characterizing features of claim 1.

Gemäß der Erfindung ist nun jeder anstellbaren, angetriebenen Rolle ein Regler zugeordnet, der die Drehzahl und den Anpreßdruck der Rollen und die Stromaufnahme der Rollenantriebe erfaßt und nach vorgegebenen Sollwerten regelt; ferner ist jeder Regler mit einem übergeordneten Regler verbunden, dem als Istwert die Lage der Sumpfspitze (Ende der Erstarrungsstrecke) bekannt ist. Dieser Regler stellt die einzeln anstellbaren Rollenpaare und die Stranggeschwindigkeit derart an, daß die Sumpfspitze in oder kurz vor einem Rollenpaar liegt, das gegen Anschläge auf seinen Abstand einstellbar ist und damit das Endmaß und die Abzugsgeschwindigkeit des Stranges, als auch den Grad der Verformung im durcherstarrten Bereich festlegt. Die Lage der Sumpfspitze kann aus den unterschiedlichen Drehzahlen, der Stromaufnahme der Antriebe zweier benachbarter Rollenpaare und den Reaktionskräften des Stranges entnommen werden, da sich die Geschwindigkeit des Stranges zwischen Erstarrungsstrecke und durcherstarrtem Bereich bei einer Strangverformung ändert. Die Reaktionskraft des Stranges kann aus den Differenzen zwischen der Verformungskraft - z.B. durch Druckmessung des Hydraulikmediums oder über Druckmeßdosen an den Rollenzapfen - und der geleisteten Verformungsarbeit (Verstellung der Rollen) ermittelt werden.According to the invention, each adjustable, driven roller is now one Controller assigned to the speed and the contact pressure of the rollers and the current consumption of the roller drives recorded and according to predetermined Regulates setpoints; each controller also has a higher-level one Controller connected, to which the position of the sump tip (end of the Solidification distance) is known. This controller sets them individually adjustable roller pairs and the strand speed in such a way that the swamp tip is in or just in front of a pair of rollers that oppose Stops on its distance is adjustable and thus the gauge block and the withdrawal speed of the strand, as well as the degree of deformation in the solidified area. The location of the swamp tip can be changed the different speeds, the current consumption of the drives of two neighboring pairs of rollers and the reaction forces of the strand be taken as the speed of the strand between solidification distance and solidified area at one Strand deformation changes. The reaction force of the strand can be the differences between the deformation force - e.g. by Pressure measurement of the hydraulic medium or via pressure transducers at the Roller pin - and the deformation work performed (adjustment of roles) can be determined.

Der übergeordnete Regler erhält in weiterer Ausgestaltung der Erfindung ferner aus den Maschinendaten der Stranggießanlage Informationen über Stahltemperatur, Qualität, Abzugsgeschwindigkeit des Stranges und die Lage der Rollen aufgrund der sich frei einstellenden Stichabnahme in den jeweiligen Rollenpaaren. Diese Daten werden ebenfalls in die Sollwerte der Einzelregler eingearbeitet. Der Vorteil des erfindungsgemäßen Regelverfahrens ist in einer frei einstellbaren Aufteilung der Strangverformung auf den Bereich der Erstarrungsstrecke und des durcherstarrten Bereiches, einer qualitätsangepaßten Verformungsbehandlung des Stranges, geringerer Belastung der die Verformung bewirkenden Rollen und der Erzeugung eines Produktes mit einem hohen Grad an Walzgefüge zu sehen. Durch letzteres wird auch eine Verbesserung der mechanischen Eigenschaften des Endproduktes gegenüber herkömmlichen Herstellungsmethoden erzielt.In a further embodiment, the higher-level controller receives the Invention also from the machine data of the continuous caster Information about steel temperature, quality, Pulling speed of the strand and the position of the rolls due to the freely occurring stitch acceptance in the respective pairs of roles. This data is also stored in the Setpoints of the individual controllers incorporated. The advantage of control method according to the invention is in a freely adjustable Distribution of strand deformation over the area of Solidification distance and the solidified area, one quality-adjusted deformation treatment of the strand, less Load on the roles causing the deformation and the production of a product with a high degree of rolling structure. By the latter will also improve the mechanical Properties of the end product compared to conventional ones Manufacturing methods achieved.

Bei den vorstehenden Ausgestaltungen wurde die Drehzahl jeder Rolle so lange erhöht oder erniedrigt, bis die Stromaufnahme aller Antriebe gleich ist. Dies bewirkt der übergeordnete Regler, der aus der Summe der Motorströme der einzelnen Antriebe den Strommittelwert bildet. Abweichungen der Motorströme der Antriebe vom Mittelwert werden über die Korrektur des Drehzahlsollwertes jedes Reglers ausgeglichen. In the above configurations, the speed of each was Roll up or down until everyone's power draw Drives is the same. This is achieved by the higher-level controller, the from the sum of the motor currents of the individual drives Forms current average. Deviations in the motor currents of the drives from the mean value via the correction of the speed setpoint each regulator balanced.

Im Fall der gegen Anschläge eingestellten Rollen könnte das bedeuten, daß eine Rolle, die nicht hinreichend Kontakt mit der Bramme hat, in die Grenzdrehzahl "läuft", ohne am Transport der Bramme teilzunehmen. Um nun fehlenden Kontakt einer Rolle mit der Bramme, also Schlupf, zu erkennen und auszuschließen, kann nach einer weiteren Ausgestaltung der Erfindung die Drehzahl der Rollen anhand eines Mittelwertes überprüft und korrigiert werden, der gebildet ist aus der Drehzahl einer ersten und dritten Rolle von zu Dreiergruppen zusammengefaßten, angetriebenen, unmittelbar aufeinanderfolgenden Rollen, wobei die Drehzahl der mittleren Rolle diesem Mittelwert innerhalb eines Toleranzbereiches entspricht, der nicht größer ist als die Differenz der Drehzahl der ersten und dritten Rolle.In the case of casters set against attacks, this could mean a role that is not in sufficient contact with the The slab has "running" at the limit speed without transporting the Slab to participate. To prevent a roll from coming into contact with the slab, i.e. slippage, to recognize and exclude, can after a Another embodiment of the invention, the speed of the rollers be checked and corrected using an average value, the is formed from the speed of a first and third roll of into groups of three, driven, immediate successive roles, the speed of the middle Role of this mean within a tolerance range corresponds to, which is not greater than the difference in speed the first and third roles.

Anhand eines Ausführungsbeispieles und den Zeichnungen soll die Erfindung näher erläutert werden.

Figur 1
zeigt den prinzipiellen Aufbau einer Stranggießanlage,
Figur 2
zeigt eine Regeleinrichtung gemäß der Erfindung,
Figur 3
zeigt eine abgewandelte Regeleinrichtung (Anspruch 4).
The invention will be explained in more detail using an exemplary embodiment and the drawings.
Figure 1
shows the basic structure of a continuous caster,
Figure 2
shows a control device according to the invention,
Figure 3
shows a modified control device (claim 4).

In der nachfolgenden Beschreibung sind gleiche Teile mit gleichen Bezugsziffern versehen.In the following description, the same parts are the same Provide reference numbers.

Flüssiger Stahl wird in eine Kokille 1 mit ca. 60 mm Dicke (Abstand der Breitseiten der Kokille voneinander) gegossen. Der Kokille 1 nachgeordnet sind Rollen 2 zur Stützung der noch dünnen Strangschale des teilweise erstarrten Stranges 3 vorgesehen. Den Rollen 2 folgt ein Abschnitt, in dem die Rollen zu einem Segment 4 zusammengefaßt sind. Einzelne Rollen 5 des Segmentes 4 sind angetrieben. Die Rollen 5 sind einzeln oder als Segment mittels Hydraulikzylinder 6 gegeneinander anstellbar. Auch unter der hierdurch hervorgerufenen Verformung des Stranges wird die Sumpfspitze im Bereich des Segmentes 4 durch Beeinflussung der Drehzahl der Rollen gehalten. Diesem Abschnitt der Rollenführung (Segment 4) folgt ein Abschnitt 7, in dem Rollen 8 angetrieben und gegen nicht dargestellte Anschläge auf ein bestimmtes Maß gegeneinander zur Erzielung einer bestimmten Dickenabnahme des Stranges und einer bestimmten Enddicke des Stranges anstellbar sind. Durch die Verformung im durcherstarrten Bereich des Stranges ändern sich die Drehzahlen der Rollen entsprechend der zwischen den einzelnen Rollenpaaren vorgenommenen Stichabnahme. Da die Rollen nur auf das Endmaß von ca. 20 bis 15 mm distanziert sind, muß die Drehzahl in einem weiten Bereich verändert werden können. Die Drehzahlen der einzelnen Rollen werden aus der Stromaufnahme der Antriebe der jeweiligen Rolle, dem Hydraulikdruck und dem Abstand der Rollen bestimmt und eingestellt. Um diese Verfahrensweise durchzuführen, wird der in Figur 2 dargestellte Regelkreis benutzt. Der aus der Kokille austretende Strang 3 erreicht ein erstes Rollenpaar 9, 9'. Die Rolle 9 ist mittels eines Hydraulikzylinders 11 anstellbar. Der Rolle 9 ist ein Regler 10 zugeordnet, der den Druck des Hydraulikmediums erfaßt mit einem vorgegebenen Sollwert vergleicht und den Anpreßdruck der Rolle 9 an den Strang 3 entsprechend einem Sollwert 1 einstellt. Von der Rolle 9' wird die Drehzahl ermittelt und einem Regler 10' zugeführt, der die Drehzahl entsprechend einem Sollwert regelt. Über den Anpreßdruck der Rolle 9 ist eine Verformung des Stranges 3 steuerbar. Nach einer ersten geringen Verformung erreicht der Strang 3 ein nächstes Rollenpaar 12, 12'. Auch dieses Rollenpaar 12, 12' verfügt entsprechend dem Rollenpaar 9, 9' über Anstellmittel 11 und eigene Regler 13, 13'. Im vorliegenden Fall liegen die Rollenpaare 9, 9' und 12, 12' im Bereich der Erstarrungsstrecke, also vor dem Durcherstarrungspunkt (Sumpfspitze) 14, so daß die Rollen 9, 9' und 12, 12' mit gleichen Drehzahlen betrieben werden.Liquid steel is placed in a mold 1 with a thickness of approx. 60 mm (distance of the Broad sides of the mold from each other) poured. The mold 1 downstream are rollers 2 to support the still thin strand shell of the partially solidified strand 3 is provided. Rolls 2 follow Section in which the roles are combined into a segment 4. Individual rollers 5 of the segment 4 are driven. The roles 5 are individually or as a segment by means of hydraulic cylinders 6 against each other employable. Even under the deformation of the Strands the bottom of the swamp in the area of segment 4 through Influencing the speed of the rollers kept. This section of the Roller guide (segment 4) is followed by a section 7 in which rollers 8 driven and against not shown attacks on a certain Measure against each other to achieve a specific decrease in thickness Strand and a certain final thickness of the strand are adjustable. Change due to the deformation in the solidified area of the strand the speeds of the rollers correspond to those between the individual ones Pair of rolls taken from the stitch. Because the roles only on that 20 to 15 mm, the speed must be in one wide range can be changed. The speeds of each Rollers are derived from the current consumption of the drives of the respective roll, the hydraulic pressure and the distance between the rollers determined and adjusted. In order to carry out this procedure, the method shown in FIG shown control loop used. The strand emerging from the mold 3 reaches a first pair of rollers 9, 9 '. The role 9 is by means of a Hydraulic cylinder 11 adjustable. The roller 9 is a controller 10 assigned, which detects the pressure of the hydraulic medium with a predetermined Setpoint value compares and the contact pressure of the roller 9 to the strand 3 sets 1 according to a setpoint. From the roll 9 ' Speed determined and fed to a controller 10 ', the speed regulates according to a setpoint. About the contact pressure of the roller 9 is a deformation of the strand 3 controllable. After a first one little deformation, the strand 3 reaches a next pair of rollers 12, 12 '. This pair of rollers 12, 12 'also corresponds to the pair of rollers 9, 9 'via adjusting means 11 and their own controllers 13, 13'. In the present In this case, the roller pairs 9, 9 'and 12, 12' are in the range of Solidification section, i.e. before the solidification point (swamp tip) 14, so that the rollers 9, 9 'and 12, 12' at the same speed operate.

Bei einem in Strangrichtung folgenden Rollenpaar 15, 15' erfolgt die Verformung im durcherstarrten Teil des Stranges 3. Hier wird die geleistete Verformungsarbeit über einen Wegaufnehmer 16 ermittelt und dem Regler 17 zugeführt. Die Verformungsarbeit wird hier ebenfalls über den Anpreßdruck des Hydraulikzylinders 11 gesteuert. Die in dem durcherstarrten Bereich des Stranges 3 erfolgte Verformung macht sich in einer Streckung des Stranges und damit einer Erhöhung der Stranggeschwindigkeit im weiteren Rollenpaar 18, 18' bemerkbar. Mit dem Rollenpaar 18, 18' wird gleichzeitig die Enddicke des die Anlage verlassenden Stranges 3 festgelegt. Ein Regler 19' sorgt für die notwendige Drehzahl des Rollenpaares 18, 18'. Alle Regler 10, 10', 13, 13', 17 und 19, 19' sind mit einem übergeordneten Regler 20 verbunden. In dem Regler 20 werden alle relevanten Daten des jeweiligen Gusses, wie Stahlanalyse, Stahltemperatur und Gießgeschwindigkeit sowie die über die einzelnen Regler erfaßten Daten, wie Anpreßdruck der Rollen, Drehzahl der Rollen und Stromaufnahme der Rollenantriebe erfaßt und als Sollwerte an die jeweiligen einzelnen Regler zurückgegeben. Die den einzelnen Reglern vorgegebenen Sollwerte sind dadurch derart modifizierbar, dass bei vorgegebener Enddicke des Stranges eine möglichst gleichmässige Verteilung der Verformungsarbeit bei geringstmöglicher Belastung der einzelnen Rollen erfolgt, ferner stellt der übergeordnete Regler die Drehzahlen in Abhängigkeit vom Verformungsgrad und der Größe der auf den durcherstarrten Bereich und der im Bereich der Erstarrungsstrecke vorgenommenen Verformung fest. Dabei ist es möglich, in Abhängigkeit von der Enddicke und dem Ausgangsmaß des Stranges die Sumpfspitze in einem bestimmten Bereich der Anlage zu halten. Dadurch ist es möglich, einen Strang zu erzeugen, der ein hohes Maß an Walzgefüge aufweist.In the case of a pair of rollers 15, 15 'following in the strand direction, this takes place Deformation in the solidified part of the strand 3. Here the performed deformation work on a displacement transducer 16 and fed to the controller 17. The deformation work is also over here the contact pressure of the hydraulic cylinder 11 controlled. The one in the through solidified area of the strand 3 deformation takes place in stretching the strand and thus increasing the Line speed noticeable in the further pair of rollers 18, 18 '. With the Roll pair 18, 18 'becomes the final thickness of the system leaving strand 3 set. A controller 19 'ensures that 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 rollers, Speed of the rollers and current consumption of the roller drives recorded and as Setpoints are returned to the individual controllers. The the Setpoints given to individual controllers are thus such Modifiable that with a given final thickness of the strand one possible Even distribution of the deformation work with the least possible The individual roles are charged, and the higher one also provides Control the speeds depending on the degree of deformation and the size that on the solidified area and that in the area of Solidification section made deformation. It is possible depending on the final thickness and the initial dimension of the strand Keep marsh tip in a certain area of the facility. Thereby it is possible to create a strand that has a high degree of Has rolling structure.

Die angegebene Regelung gestattet es ferner, die Verformungsarbeit auch innerhalb derjenigen Führungsstrecke, in der die Rollen gegen Anschläge anstellbar sind und sich über einen durcherstarrten Bereich des Stranges erstrecken, aufzuteilen. Dabei kann, je nach Betriebsverhältnissen, das Endmaß des Stranges bereits mit einem ersten Rollenpaar erzielt werden. In Strangabzugsrichtung nachfolgende Rollenpaare werden dann im Sinne einer Übereinstimmung der Drehzahl mit diesem, das Endmaß bestimmenden Rollenpaar geregelt, also konstant gehalten. Sollte aufgrund eines erhöhten Verformungswiderstandes des Stranges, z.B. durch abgesenkte Temperatur, eine Aufteilung der Verformungsarbeit auf mehrere Rollenpaare notwendig sein, so übernimmt eines der folgenden Rollenpaare die "Dickenfestlegung" des Stranges, so daß in Strangrichtung vorgeordnete Rollenpaare nicht gegen die Anschläge, sondern aufgrund der Regelung frei "distanziert" sind. Die Drehzahl vor- bzw. nachgeordneter Rollen erfolgt entsprechend. The specified regulation also allows the deformation work within the guideway in which the rollers against stops are adjustable and over a solidified area of the strand extend to split. Depending on the operating conditions, the Gauge of the strand can already be achieved with a first pair of rollers. The following pairs of rollers in the strand withdrawal direction are then in the sense a coincidence of the speed with this, determining the final dimension Controlled pair of rollers, i.e. kept constant. Should be due to a increased resistance to deformation of the strand, e.g. by lowered Temperature, a distribution of the deformation work over several Role pairs are necessary, one of the following pairs of roles takes over the "thickness determination" of the strand, so that in the strand direction upstream roller pairs not against the attacks, but because of the Regulation are freely "distanced". The speed upstream or downstream Rolling is done accordingly.

Die Figur 3 zeigt eine Prinzipskizze für die Regeleinrichtung nach Anspruch 5, die den Vorteil hat, daß ein Schlupf einer angetriebenen Rolle am Strang vermieden und die Rolle durch den Regelkreis in ihrer vorgesehenen Zweckbestimmung gehalten wird. Außerdem ist das System in der Lage, Abweichungen des Rollendurchmessers abzufangen und eine selbsttätige Einregelung auf eine neue Nenndrehzahl vorzunehmen.FIG. 3 shows a schematic diagram for the control device Claim 5, which has the advantage that a slip one avoided driven role on the strand and the role by the Control loop is kept in its intended purpose. The system is also able to detect deviations from the Intercept roll diameter and an automatic adjustment to a new nominal speed.

Die Rollen n, n+1, n+2 einer Dreiergruppe werden jeweils über Motoren M angetrieben, wobei die Drehzahl durch die Tachometer TD ermittelt wird.The roles n, n + 1, n + 2 of a group of three become each driven by motors M, the speed is determined by the tachometer TD.

Bei dem vorgesehenen Regelkonzept kann eine Rolle, die nicht in Kontakt mit der Bramme ist, die also Schlupf hat, in die Grenzdrehzahl laufen. Eine schlupfende Rolle kann zum einen Oberflächenschäden bewirken, zum anderen ist es möglich, daß die wieder greifende Rolle kurzzeitig den Strang so beschleunigt, daß der Strang aus der Kokille gerissen wird. Wenn man nur die Drehzahlen dreier benachbarter Rollen betrachtet, so kann die mittlere Rolle je nach Verformungsgrad die Drehzahl der ersten oder der letzten Rolle annehmen. Die Drehzahl kann nie, Kontakt mit der Bramme vorausgesetzt, schneller als die letzte Rolle der Dreiergruppe und nie langsamer als die erste Rolle der Dreiergruppe werden. Eine blockierende Rolle wird in die Stromgrenze laufen und als gestört gemeldet. Die schlupfende Rolle wird vom Einzelregler nicht als am Transport beteiligt erkannt, aber wenn die Drehzahl der mittleren Rolle größer ist als die der letzten Rolle der Dreiergruppe, kann sie nur den Kontakt mit der Bramme verloren haben, sie hat Schlupf.In the proposed control concept, a role that is not in contact with the slab, which is slipping has to run in the limit speed. A slipping Roller can cause surface damage on the one hand others it is possible that the re-engaging role briefly accelerates the strand so that the strand is pulled out of the mold. If only you Speeds of three neighboring roles considered, see above can the middle role depending on the degree of deformation Accept the speed of the first or last roll. The speed can never contact the slab provided faster than the last role of the Triple and never slower than the first role of the Triple. A blocking role is in the current limit is running and reported as faulty. The Slipping role is not considered by the individual controller as Transport involved detected, but when the speed of the middle role is larger than that of the last role the triple, it can only make contact with the Lost slab, it has slip.

Eine schlupfende Rolle, die durch den Drehzahlvergleich erkannt wird, kann also als gestört gemeldet werden, sie kann auch durch Eingriffe in den Regler auf die mittlere Drehzahl der Dreiergruppe zurückgeführt werden, um dann, wenn der Kontakt wieder hergestellt ist, am Transport wieder teilzunehmen. A slipping role by the speed comparison is recognized, can be reported as faulty, it can also be done by intervening in the controller on the average speed of the group of three to then when contact is restored is to participate in the transport again.

Die Anstellung der Rollen bzw. das Einstellen des Rollenabstandes erfolgt über Hydraulikzylinder. Der notwendige Druck wird in einer druckgeregelten Hydraulikstation erzeugt. Der maximale Druck ist nur von der Festigkeit des maschinellen Teiles der Anlage bestimmt. Wie oben bereits beschrieben, muß an jedem Hydraulikzylinder eine Wegmessung eingebaut werden. Nur mit Hilfe der Wegmessungen lassen sich Verklemmen der Anstellung und andere Fehler erkennen. Die Anstellung erfolgt weggeregelt über Servoventile. Die Wegmessung dient als Istwertgeber.The employment of the roles or the adjustment of the Roll spacing takes place via hydraulic cylinders. The necessary pressure is regulated in a pressure Hydraulic station generated. The maximum pressure is only on the strength of the mechanical part of the system certainly. As already described above, must be on everyone Hydraulic cylinder a distance measurement can be installed. Just with the help of the path measurements, the Recognize employment and other mistakes. The job is controlled by servo valves. The distance measurement serves as an actual value transmitter.

Zu der Antriebsregelung sei noch erwähnt, daß jede angetriebene Rolle über einen Regler als Drehzahlregler wirkend angetrieben wird. Der mehreren Rollen zugeordnete übergeordnete Regler hat bei einer konventionellen Stranggießanlage die Aufgabe, kleine Störungen auszugleichen. Dazu wird der Mittelwert aus der Summe der Motorströme jedes Antriebes gebildet. Die Abweichung des Motorstromes jeder Rolle vom Mittelwert wird als Korrekturgröße auf den Sollwert aufgeschaltet. Mit dieser Anordnung werden die Einflüsse verschiedener Rollendurchmesser und andere Störeinflüsse ausgeregelt. Die notwendige Korrektor ist nur klein.Regarding the drive control, it should be mentioned that each driven roller via a controller as a speed controller is actively driven. The multiple roles assigned higher-level controller has one conventional continuous caster the job, small Compensate for disturbances. To do this, the mean is taken from the sum of the motor currents of each drive. The Deviation of the motor current of each roll from the mean is applied as a correction variable to the setpoint. With this arrangement, the influences are different Roll diameter and other interferences regulated. The necessary corrector is only small.

Beim Dünnbrammengießwalzen im Bereich der Verformung mit durcherstarrtem Kern (Gießwalzen) hat der Korrekturregler einen erheblich größeren Korrekturbereich zu berechnen. Hier wird bei jedem Durchgang ausgehend vom letzten Korrekturwert neu berechnet. Da die Korrektur der Drehzahl abhängig von der Differenz des Einzelstromes zum Strommittelwert sehr groß sein kann, kann der Motor bei schlupfender (nicht in Kontakt mit dem Strang) laufender Rolle in die Grenzdrehzahl gehen. Diese schlupfenden Rollen werden dann durch die Überwachung erkannt.For thin slab casting in the area of deformation with solidified core (casting rolls) Correction controller a much larger one Calculate correction range. Here is with everyone Continuity starting from the last correction value calculated. Since the correction of the speed depends on the difference of the single current to the current average can be very large, the engine can slip (not in contact with the strand) role in progress the limit speed go. These slipping roles are then recognized by the monitoring.

Claims (4)

  1. Continuous casting process for the production of slabs with a reduced thickness compared to the cast state, whereby steel is poured into a continuous casting chill (1) and a continuous casting partly solidified in cross-section is guided between pairs of rollers (9, 9'; 12, 12') and withdrawn by means of driven rollers (5; 8), and individual rollers (9, 12, 15, 19) of pairs of rollers are adjustable hydraulically so as to have a deforming action on the continuous casting, characterised in that for production of a product with a high level of rolling texture which is coilable, the speed of rotation, the current consumption of the driven rollers and the contact pressure of the rollers are detected and each fed to a controller (10, 10', 13, 13', 17, 19, 19'), in that each controller determining the speed of rotation of individual driven rollers is adjustable by means of a superordinate controller (20) such that the final dimension and the speed of withdrawal of the continuous casting are determined by at least one pair of rollers (15, 15', 18, 18') adjustable against stops and determining the thickness of the continuous casting and having a deforming action on an already completely solidified part of the continuous casting, and superordinate and subordinate rollers are adjusted in the speed of rotation and the current consumption of their drives according to the change of shape of the continuous casting produced by the rollers adjustable against stops, whereby the position of the end of the liquid phase (end of the solidified part) is determined from the measured values for the current consumption, reaction force of the continuous casting and roller spacing, and the contact pressures of the adjustable rollers are adjusted such that the end of the liquid phase lies in front of at least one pair of rollers adjustable against stops to a predetermined spacing.
  2. Process according to claim 1, characterised in that the superordinate controller is a computer which determines the nominal values to be defined for the individual controllers from the detected measured values of the continuous casting installation and defines these with a view to the lowest possible roller loading of the deforming rollers and the lowest possible contact pressures of the rollers.
  3. Process according to claim 2, characterised in that the computer processes the nominal values to be defined for the individual controller from the measured values of the continuous casting installation such as casting speed, steel temperature and steel grade of the melt to be cast.
  4. Process according to claim 1, characterised in that the speed of rotation of the rollers is checked and corrected with reference to a mean value which is formed from the speed of rotation of a first and third roller of groups of three consecutive driven rollers, whereby the speed of rotation of the middle roller corresponds to this mean value within a tolerance range which is not greater than the difference between the speed of rotation of the first and the 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
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
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)

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

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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 (2) DE3907905C2 (en)
ES (1) ES2042057T5 (en)

Families Citing this family (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2089317T3 (en) * 1991-09-19 1996-10-01 Schloemann Siemag Ag Procedure and installation for the manufacture of steel belt.
US5488987A (en) * 1991-10-31 1996-02-06 Danieli & C. Officine Meccaniche Spa Method for the controlled pre-rolling of thin slabs leaving a continuous casting plant, and relative device
IT1252847B (en) * 1991-10-31 1995-06-28 Danieli Off Mecc Controlled pre-rolling unit for thin slabs coming out of continuous casting
US5343934A (en) * 1993-02-01 1994-09-06 Southwire Company Multiple pinch roll apparatus and method for advancing a continuous rod
AT398396B (en) * 1993-02-16 1994-11-25 Voest Alpine Ind Anlagen Method for producing a tape, pre-strip or a lam
US5490555A (en) * 1994-05-25 1996-02-13 Voest-Alpine Services and Technologies Corp. Method of controlling forces applied to a continuously cast product
JP3008821B2 (en) * 1994-07-29 2000-02-14 住友金属工業株式会社 Continuous casting method and apparatus for thin slab
TW297788B (en) * 1994-12-15 1997-02-11 Sumitomo Metal Ind
IT1280171B1 (en) * 1995-05-18 1998-01-05 Danieli Off Mecc Vertical casting line for slabs
CN1156979A (en) * 1995-06-21 1997-08-13 住友金属工业株式会社 Continuous casing of thin cast pieces
ES2128816T3 (en) * 1995-11-28 1999-05-16 Danieli Off Mecc Method for previous passing by rollers of thin plates.
DE19627336C1 (en) * 1996-06-28 1997-09-18 Mannesmann Ag Guiding a cast strip in e.g. steel strip casting units
DE19639297C2 (en) * 1996-09-25 2000-02-03 Schloemann Siemag Ag Method and device for high-speed continuous casting plants with a reduction in strand thickness during solidification
DE19849603C2 (en) * 1997-11-21 2002-11-07 Sms Demag Ag Process and continuous caster for casting slabs with a continuous mold and a strand guide from rolls
AT243586T (en) 1997-11-21 2003-07-15 Sms Demag Ag Method and plant for continuously shoeing
US5934536A (en) * 1998-03-04 1999-08-10 Morgan Construction Company Adjustable turndown apparatus
DE19817034A1 (en) 1998-04-17 1999-10-21 Schloemann Siemag Ag Continuous casting of thin metal slabs
DE10236367A1 (en) * 2002-08-08 2004-02-19 Sms Demag Ag Dynamic control of a casting strand made from steel on both sides of roll segments used in a continuous casting installation comprises using the roll segments in a cold strand, hot strand and/or soft reduction region
DE10302265A1 (en) * 2003-01-22 2004-07-29 Sms Demag Ag Manufacture of continuously-cast steel slab, includes stage of high-energy deformation at high temperature to reduce depth of vibration markings in product
DE102004010038A1 (en) * 2004-03-02 2005-09-15 Sms Demag Ag Driving the safety rolls (7c) of a continuous casting machine useful for casting molten metals, especially molten steels
DE102004054296A1 (en) * 2004-11-09 2006-05-11 Sms Demag Ag Control and / or regulating device for a support roll stand of a continuous casting apparatus for metals, in particular for steel materials
CN1329146C (en) * 2005-01-31 2007-08-01 宝山钢铁股份有限公司 Thin band continuous-casting sticking-roll on-line forecasting method
CN100396391C (en) * 2005-09-01 2008-06-25 中冶东方工程技术有限公司 Thin steel belt casting and rolling production process
WO2007115140A2 (en) * 2006-03-31 2007-10-11 Alaka'i Technologies Aircraft-engine trend monitoring methods and systems
DE102007004053A1 (en) 2007-01-22 2008-07-31 Siemens Ag Casting plant for casting a cast product and method for guiding a cast material from a casting container of a casting plant
AU2008100847A4 (en) * 2007-10-12 2008-10-09 Bluescope Steel Limited Method of forming textured casting rolls with diamond engraving
DE102008014524A1 (en) * 2007-12-28 2009-07-02 Sms Demag Ag Continuous casting plant with a device for determining solidification states of a cast strand and method therefor
CN101239358B (en) * 2008-03-06 2010-06-30 张明 Double-roller casting rolling-hot continuous rolling method and equipment
DE102008050393A1 (en) * 2008-10-02 2010-04-08 Sms Siemag Aktiengesellschaft Arrangement and method for detecting an operating state of a strand guide
DE102009031651A1 (en) * 2009-07-03 2011-01-05 Sms Siemag Aktiengesellschaft Method for determining the position of the sump tip of a cast metal strand and continuous casting plant
JP2012223809A (en) * 2011-04-22 2012-11-15 Sumitomo Metal Ind Ltd Method for continuously casting steel
US10155263B2 (en) 2012-09-28 2018-12-18 Ati Properties Llc Continuous casting of materials using pressure differential
GB2522873A (en) * 2014-02-07 2015-08-12 Siemens Vai Metals Tech Gmbh A method of forming tailored cast blanks
CN104128583B (en) * 2014-08-14 2016-07-06 中冶南方工程技术有限公司 A kind of continuous casting crystallizer for plate billet on-line width adjustment method and device
KR101697671B1 (en) * 2015-04-23 2017-01-18 주식회사 포스코 Apparatus for inspecting roll
KR101736574B1 (en) * 2015-06-04 2017-05-17 주식회사 포스코 Solidifying apparatus
CN105774021B (en) * 2016-04-03 2018-01-05 合肥博雷电子信息技术有限公司 A kind of production of construction materials system for automating regulation briquetting pressure
EP3338914A1 (en) * 2016-12-22 2018-06-27 Primetals Technologies Austria GmbH Method for the endless manufacture of a coiled hot rolled sheet in a combined casting and rolling installation, method for starting up a combined casting and rolling installation, and a combined casting and rolling installation
CN107685141B (en) * 2017-09-11 2019-04-16 中冶赛迪工程技术股份有限公司 A kind of continuous caster driving roller control method
DE102017219464A1 (en) * 2017-10-30 2019-05-02 Sms Group Gmbh Continuous casting plant with single roll adjustment
US10850322B2 (en) 2017-10-30 2020-12-01 Nucor Corporation Casting stand control system with radius roll feedback and method of use
CN109434056A (en) * 2018-12-05 2019-03-08 东北大学 A kind of double single-point weight soft reduction process of continuous casting billet solidifying end
CN109465415A (en) * 2018-12-07 2019-03-15 东北大学 Fan-shaped section roll array structure under a kind of double single-point weight in continuous casting and solidifying end

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3358743A (en) * 1964-10-08 1967-12-19 Bunker Ramo Continuous casting system
JPS5422777B2 (en) * 1973-09-17 1979-08-09
US4148349A (en) * 1976-05-08 1979-04-10 Yutaka Sumita Method for controlling slippage between rolls and a slab in a continuous compression casting apparatus
SU685420A1 (en) * 1978-04-20 1979-09-15 Всесоюзный Научно-Исследовательский Институт Автоматизации Черной Металлургии Continuous metal-casting plant automatic control method
JPS6225064B2 (en) * 1979-04-06 1987-06-01 Hitachi Ltd
JPS58184052A (en) * 1982-04-23 1983-10-27 Hitachi Ltd Control device for compression in continuous casting machine
JPS6130272A (en) * 1984-07-24 1986-02-12 Toshiba Corp Speed control device for pinch roll group for continuous casting installation
JPH0436778B2 (en) * 1985-07-02 1992-06-17 Sumitomo Metal Ind
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

Also Published As

Publication number Publication date
JP3023114B2 (en) 2000-03-21
KR900001443A (en) 1990-02-27
EP0350431B1 (en) 1993-06-02
ES2042057T5 (en) 2000-11-16
US5018569A (en) 1991-05-28
EP0350431A3 (en) 1991-03-27
DE3907905A1 (en) 1990-09-13
CA1330615C (en) 1994-07-12
KR970001551B1 (en) 1997-02-11
EP0350431A2 (en) 1990-01-10
JPH0252159A (en) 1990-02-21
ES2042057T3 (en) 1993-12-01
DE58904550D1 (en) 1993-07-08
CN1048669C (en) 2000-01-26
CN1039370A (en) 1990-02-07
BR8903264A (en) 1990-02-13
DE3907905C2 (en) 1999-01-21

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