EP0028766B1 - Method and device for changing the dimensions of a strand during continuous casting - Google Patents

Method and device for changing the dimensions of a strand during continuous casting Download PDF

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Publication number
EP0028766B1
EP0028766B1 EP80106617A EP80106617A EP0028766B1 EP 0028766 B1 EP0028766 B1 EP 0028766B1 EP 80106617 A EP80106617 A EP 80106617A EP 80106617 A EP80106617 A EP 80106617A EP 0028766 B1 EP0028766 B1 EP 0028766B1
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Prior art keywords
movement
during
strand
displacement
rotational movement
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German (de)
French (fr)
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EP0028766A1 (en
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Hans Gloor
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SMS Concast AG
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Concast Holding AG
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    • 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
    • B22D11/168—Controlling or regulating processes or operations for adjusting the mould size or mould taper

Definitions

  • the invention relates to a method for changing the dimensions of a strand during continuous casting while a casting is in progress, wherein at least one movable mold wall is moved by means of two movement devices arranged one behind the other in the longitudinal axis running direction about a pivot axis running transversely to the longitudinal axis and parallel to the mold wall and displaced transversely to the longitudinal axis axis and one Device for performing the method.
  • JP-A-50 152 9266 a method for reducing the width of a slab strand during a casting operation.
  • the three steps mentioned - pivoting, parallel displacement, pivoting back of the narrow side - are also used in this method.
  • the invention is therefore based on the object of providing a method and a device which overcome the disadvantages mentioned, enable shorter adjustment times and short transition pieces and produce larger format differences without increasing the risk of breakthrough. Furthermore, the mold wear caused by friction of the strand crust on the mold wall should be kept small.
  • this object is achieved in that the mutual ratio of the displacement speeds of the two movement devices changes and the position of the pivot axis is shifted parallel to its starting position at least during a period of the pivoting movement of the mold wall.
  • each of the two movement devices is provided with a controller for setting the displacement speed and that this controller is connected to a programmable computer.
  • the invention recommends that the movement device closer to the mold injection side is moved at a linearly decreasing speed during the swiveling movement from the start of swiveling backwards, while the movement device closer to the mold exit side at the beginning of the swing back movement initially at a constant speed during a first section of the swing back time and during a second section of the swing back time is moved at a linearly decreasing speed.
  • Additional improvements with regard to reducing the air gap and / or reducing the deformation of the strand crust can be achieved if at least the displacement speed of a movement device is changed during the pivoting movement according to a higher-order transition curve.
  • discontinuously change the displacement speed of at least one movement device during the pivoting movement can also be advantageous to discontinuously change the displacement speed of at least one movement device during the pivoting movement.
  • the discontinuous change in displacement speed for example, can be coupled with mold oscillation or with other casting parameters, such as pulling force of the strand, friction between strand and mold, heat transfer between the strand and the moving mold wall, adjusting force measured on the drive of the movement device, etc.
  • the invention recommends a simultaneous expiry of the sales. pivoting movement with a movement of the mold wall directed approximately transversely to the longitudinal axis of the strand. During the entire displacement movement, the mold wall can also perform pivoting movements transversely to the longitudinal axis of the mold during the known phase of parallel displacement of the mold wall, the position of the pivot axis being continuously shifted.
  • At least one of the movable mold walls is pivoted in the form of spindles by means of two movement devices provided one behind the other in the strand running direction. In most cases, two mold walls are adjusted at the same time.
  • the pivoting speed 5 of the spindle closer to the mold exit side is smaller than the pivoting speed 6 of the spindle closer to the mold injection side.
  • the swivel axis is often placed on the exit-side edge of the mold wall.
  • the second method step is shown between 1 and 2, which is characterized by a parallel displacement of the mold wall.
  • the two spindles have the same adjustment speed.
  • the casting cone correction adapted to the strand width change can also be superimposed.
  • the third process step which involves swiveling back, takes place in the period between 2 and 3.
  • the spindle closer to the mold exit side moves at a constant speed 7 during the pivoting-back movement, while the other spindle moves at a linearly decreasing speed 8 during this period.
  • the mutual ratio of the displacement speeds of the two spindles changes during the entire period of the pivoting-back movement of the mold wall. Furthermore, the position of the pivot axis is continuously shifted throughout the entire period.
  • FIG. 2 Another swing-back characteristic is shown in FIG. 2 in a further speed-time diagram.
  • the movement sequences in the first and second time period are unchanged compared to FIG. 1.
  • the two spindles move at different linearly decreasing speeds according to lines 12 and 13 during the swiveling back movement 3 moved at a steadily decreasing speed 12.
  • a swiveling speed 14 is shown during the swiveling back movement according to a curve 14 of a higher order.
  • the ratio of the air gap to the deformation of the strand crust can be changed and optimized according to the casting parameters.
  • transition curves 21 and 22 for the speed increase are also shown in the first period during the pivoting movement. shown.
  • the movement device closer to the mold pouring side is moved at a linearly decreasing speed along the line 23 during the return swing from the beginning of the return swing, while the other movement device at the beginning of the return swing initially at a constant speed 24 during a first part of the return swing time and during a second part of the swing back time is moved at a linearly decreasing speed 25.
  • the displacement speed can also change discontinuously, for example in a step-like manner, during the movement of the mold wall.
  • two moving devices 32, 33 for changing the format are articulated on an adjustable transverse wall 30 of a plate mold arranged between two longitudinal walls 34.
  • These movement devices 32, 33 are designed as spindles, the movement device 32 representing the movement device closer to the mold injection side and 33 the movement device closer to the mold exit side.
  • the movement devices 32, 33 are provided with drives 36, 37, which in turn are provided with controls 38, 39 for adjusting the displacement speed.
  • the predetermined displacement speeds of the two independently driven movement devices are controlled by a programmable computer 40.
  • the computer 40 can be provided with a control device 41 which, as a guide variable for the computer program, has at least one casting parameter input, such as the friction value 42 between the strand and the mold, cooling capacity 43 of the moving mold wall, adjusting force 44 measured on the drive of the movement devices and / or gap size 45 between moving mold wall and strand, evaluates.
  • a control device 41 which, as a guide variable for the computer program, has at least one casting parameter input, such as the friction value 42 between the strand and the mold, cooling capacity 43 of the moving mold wall, adjusting force 44 measured on the drive of the movement devices and / or gap size 45 between moving mold wall and strand, evaluates.
  • the spindles 32, 33 other movement devices, such as path-controlled hydraulic cylinders etc., can also be used.
  • the movable mold wall is moved about a pivot axis running transversely to the longitudinal axis of the strand and parallel to the mold wall.
  • the position of the fictitious pivot axis 50 is shifted parallel to its starting position at least during a period of the pivoting back movement.
  • Pivotal axes 50 are conceivable which coincide with the boundary surface of the mold cavity of the movable mold wall or which lie outside the mold wall.
  • the process for changing the dimensions of a strand includes both enlarging and reducing the size of the strand.

Abstract

To obtain a short adjustment time with small risk of metal break-out, it is intended during the changing of the dimensions of a continuously cast strand to alter during the casting operation i.e. while the pour or teeming operation is in progress, at least during a time interval of the pivotal movement of the mold wall, the mutual relationship of the displacement speeds of two devices for moving the mold wall and the position of the pivot axis of the mold wall is shifted parallel to its starting position.

Description

Die Erfindung betrifft ein Verfahren zum Verändern der Abmessungen eines Stranges beim Stranggiessen während eines laufenden Gusses, wobei mindestens eine bewegbare Kokillenwand mittels zwei in Stranglängsachsenlaufrichtung hintereinander angeordneten Bewegungseinrichtungen um eine quer zur Stranglängsachse und parallel zur Kokillenwand verlaufende Schwenkachse bewegt und quer zur Stranglängsachse verschoben wird und eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a method for changing the dimensions of a strand during continuous casting while a casting is in progress, wherein at least one movable mold wall is moved by means of two movement devices arranged one behind the other in the longitudinal axis running direction about a pivot axis running transversely to the longitudinal axis and parallel to the mold wall and displaced transversely to the longitudinal axis axis and one Device for performing the method.

Bei diesem bekannten Verfahren zum Vergrössern der Abmessungen eines Stranges während eines laufenden Gusses, d. h. ohne Unterbrechung der Stahlzufuhr, (DE-A 27 43 025). Wird mindestens eine der beiden bewegbaren Querwände von Plattenkokillen mittels zwei in Stranglaufrichtung hintereinander angeordneten Spindeln bewegt, wobei die axiale Verstellgeschwindigkeit der Spindeln in einem bestimmten, konstanten Verhältnis zueinander stehen. Die Schmalseite wird dabei in einem ersten Schritt verschwenkt, anschliessend in einem zweiten Schritt in der verschwenkten Lage quer zur Stranglängsachse parallel verschoben und in einem dritten Schritt wieder in eine Lage, die dem gewünschten Giesskonus entspricht, zurückverschwenkt. Beim ersten Schritt wird die Schmalseite um eine Verschwenkachse bewegt, die mit der Kokillenausgangskante der Schmalseite zusammenfällt. Beim dritten Schritt liegt die Verschwenkachse im Bereich des Badspiegels oder fällt mit der Kokilleneingangskante der Schmalseite zusammen.In this known method for enlarging the dimensions of a strand during a running casting, i. H. without interrupting the steel supply, (DE-A 27 43 025). At least one of the two movable transverse walls of plate molds is moved by means of two spindles arranged one behind the other in the strand running direction, the axial adjustment speed of the spindles being in a specific, constant relationship to one another. The narrow side is pivoted in a first step, then in a second step in the pivoted position, displaced parallel to the longitudinal axis of the strand, and in a third step, pivoted back into a position that corresponds to the desired casting cone. In the first step, the narrow side is moved about a pivot axis that coincides with the mold exit edge of the narrow side. In the third step, the pivot axis lies in the area of the bath level or coincides with the mold entrance edge on the narrow side.

Es ist aber auch ein Verfahren bekannt (JP-A-50 152 926), während eines laufenden Gusses die Breite eines Brammenstranges zu verkleinern. Auch bei diesem Verfahren werden die drei genannten Schritte - Verschwenken, Parallelverschieben, Zurückschwenken der Schmalseite - angewendet.However, a method is also known (JP-A-50 152 926) for reducing the width of a slab strand during a casting operation. The three steps mentioned - pivoting, parallel displacement, pivoting back of the narrow side - are also used in this method.

Bei beiden genannten Verfahren entstehen während der Verschwenkbewegung Luftspalte zwischen der Strangkruste und der Kokillenwand und/oder unzulässige Verformungen an der noch dünnen Strangkruste mit entsprechender Reibung und Kokillenverschleiss. Diese Umstände zwingen zu sehr niedrigen Verschwenkgeschwindigkeiten, wenn das Durchbruchrisiko klein gehalten werden soll. Kleine Verschwenkwinkel ergeben im weiteren niedrige Verstellgeschwindigkeiten und neben einer geringen Giessleistung zusätzlich lange, konische Uebergangsstücke zwischen dem alten und dem neuen Strangformat, die unerwünscht sind, weil sie durch Besäumen mittels Brennschneiden korrigiert werden müssen.In both of the methods mentioned, air gaps between the strand crust and the mold wall and / or inadmissible deformations on the still thin strand crust with corresponding friction and mold wear occur during the pivoting movement. These circumstances force very low swiveling speeds if the risk of breakthrough is to be kept low. Small pivoting angles also result in low adjustment speeds and, in addition to a low casting performance, also long, conical transition pieces between the old and the new strand format, which are undesirable because they have to be corrected by trimming using flame cutting.

Der Erfindung liegt deshalb die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zu schaffen, die die genannten Nachteile überwinden, kürzere Verstellzeiten und kurze Uebergangsstücke und die Erzeugung grösserer Formatunterschiede ermöglichen, ohne das Durchbruchrisiko zu erhöhen. Im weitern soll der Kokillenverschleiss, hervorgerufen durch Reibung der Strang kruste an der Kokillenwand, klein gehalten werden.The invention is therefore based on the object of providing a method and a device which overcome the disadvantages mentioned, enable shorter adjustment times and short transition pieces and produce larger format differences without increasing the risk of breakthrough. Furthermore, the mold wear caused by friction of the strand crust on the mold wall should be kept small.

Nach der Erfindung wird diese Aufgabe dadurch gelöst, dass mindestens während eines Zeitabschnittes der Verschwenkbewegung der Kokillenwand das gegenseitige Verhältnis der Verschiebegeschwindigkeiten der beiden Bewegungseinrichtungen verändert und die Lage der Schwenkachse parallel zu ihrer Ausgangslage verschoben wird.According to the invention, this object is achieved in that the mutual ratio of the displacement speeds of the two movement devices changes and the position of the pivot axis is shifted parallel to its starting position at least during a period of the pivoting movement of the mold wall.

Die Vorrichtung zur Durchführung des Verfahrens zeichnet sich dadurch aus, dass jede der beiden Bewegungseinrichtungen mit einer Steuerung zur Einstellung der Verschiebegeschwindigkeit versehen ist und dass diese Steuerung mit einem programmierbaren Rechner verbunden ist.The device for carrying out the method is characterized in that each of the two movement devices is provided with a controller for setting the displacement speed and that this controller is connected to a programmable computer.

Bei Anwendung des erfindungsgemässen Verfahrens ist es möglich, während der Verschwenkbewegung sowohl entstehende Luftspalte zwischen der Strangkruste und der Kokillenwand als auch Verformungen der Strangkruste durch die Kokillenwand minimal zu halten. Es sind Werte für Veränderungen der Strangbreite durch Verformen und Luftspalte bei Kokillen mit 600 mm Nutzlänge von beispielsweise 0,5 mm erreichbar. Die Giessgeschwindigkeit kann auf einem hohen Wert gehalten werden. Die erreichbare hohe Verschwenkgeschwindigkeit ermöglicht es, dass während eines kurzen Zeitabschnittes grosse Verschwenkwinkel einstellbar sind. Bei der anschliessenden Parallelverschiebung erlauben grosse Verschwenkwinkel eine hohe Verschiebegeschwindigkeit der bewegbaren Kokillenwand quer zur Stranglängsachse. Daraus resultieren kurze Verstellzeiten und kurze Uebergangsstücke. Im weitern kann das Durchbruchrisiko und der Kokillenverschleiss bei im Stranggiessen bekannten Durchschnittswerten gehalten werden.When using the method according to the invention, it is possible to keep air gaps between the strand crust and the mold wall as well as deformations of the strand crust through the mold wall to a minimum during the pivoting movement. Values for changes in the strand width due to deformation and air gaps in molds with a useful length of 600 mm, for example 0.5 mm, can be achieved. The casting speed can be kept at a high value. The high pivoting speed that can be achieved enables large pivoting angles to be set during a short period of time. In the subsequent parallel displacement, large swivel angles allow the movable mold wall to move at high speed transversely to the longitudinal axis of the strand. This results in short adjustment times and short transition pieces. Furthermore, the risk of breakthrough and mold wear can be kept at the average values known in continuous casting.

Es sind viele unterschiedliche Variationen der Bewegungscharakteristik der beiden Bewegungseinrichtungen bezüglich Beschleunigungen und Verzögerungen im Rahmen der Erfindung möglich. Als ein besonders vorteilhaftes Verhältnis der Verschiebegeschwindigkeit der beiden Bewegungseinrichtungen zueinander zum Zurückschwenken der bewegbaren Kokillenwand vor der Beeindigung einer Kokillenhohlraumvergrösserung empfiehlt die Erfindung, dass die der Kokilleneingiesseite nähere Bewegungseinrichtung während der Rückschwenkbewegung ab Rückschwenkbeginn mit einer linear abnehmenden Geschwindigkeit bewegt wird, während die der Kokillenaustrittseite nähere Bewegungseinrichtung bei Rückschwenkbeginn vorerst mit einer konstanten Geschwindigkeit während eines ersten Abschnittes der Rückschwenkzeit bewegt und während eines zweiten Abschnittes der Rückschwenkzeit mit einer linear abnehmenden Geschwindigkeit bewegt wird.Many different variations of the movement characteristics of the two movement devices with regard to accelerations and decelerations are possible within the scope of the invention. As a particularly advantageous ratio of the displacement speed of the two movement devices to one another for swiveling back the movable mold wall before an enlargement of the mold cavity is involved, the invention recommends that the movement device closer to the mold injection side is moved at a linearly decreasing speed during the swiveling movement from the start of swiveling backwards, while the movement device closer to the mold exit side at the beginning of the swing back movement initially at a constant speed during a first section of the swing back time and during a second section of the swing back time is moved at a linearly decreasing speed.

Zusätzliche Verbesserungen bezüglich Luftspaltverkleinerung und/oder Verringerung der Verformungen der Strang kruste sind erreichbar, wenn mindestens die Verschiebegeschwindigkeit einer Bewegungseinrichtung während der Verschwenkbewegung gemäss einer Uebergangskurve höherer Ordnung verändert wird.Additional improvements with regard to reducing the air gap and / or reducing the deformation of the strand crust can be achieved if at least the displacement speed of a movement device is changed during the pivoting movement according to a higher-order transition curve.

In bestimmten Fällen kann es aber auch vorteilhaft sein, die Verschiebegeschwindigkeit mindestens einer Bewegungseinrichtung während der Verschwenkbewegung diskontinuierlich zu verändern. Dabei kann die diskontinuierlich verlaufende Verschiebegeschwindigkeitsänderung, beispielsweise mit der Kokillenoszillation oder mit weiteren Giessparametern, wie Ausziehkraft des Stranges, Reibung zwischen Strang und Kokille, Wärmeübergang zwischen Strang und der bewegten Kokillenwand, Verstellkraft gemessen am Antrieb der Bewegungseinrichtung etc., gekoppelt werden.In certain cases, however, it can also be advantageous to discontinuously change the displacement speed of at least one movement device during the pivoting movement. The discontinuous change in displacement speed, for example, can be coupled with mold oscillation or with other casting parameters, such as pulling force of the strand, friction between strand and mold, heat transfer between the strand and the moving mold wall, adjusting force measured on the drive of the movement device, etc.

Als weitere vorteilhafte Lösung empfiehlt die Erfindung einen gleichzeitigen Ablauf der Ver- . schwenkbewegung mit einer etwa quer zur Stranglängsachse gerichteten Verschiebebewegung der Kokillenwand. Während der ganzen Verschiebebewegung kann dabei die Kokillenwand auch während der bekannten Phase der Parallelverschiebung der Kokillenwand quer zur Stranglängsachse Verschwenkbewegungen ausführen, wobei die Lage der Schwenkachse laufend verschoben wird.As a further advantageous solution, the invention recommends a simultaneous expiry of the sales. pivoting movement with a movement of the mold wall directed approximately transversely to the longitudinal axis of the strand. During the entire displacement movement, the mold wall can also perform pivoting movements transversely to the longitudinal axis of the mold during the known phase of parallel displacement of the mold wall, the position of the pivot axis being continuously shifted.

Die Bewegungseinrichtungen können beispielsweise mit Steuerungen versehen sein, die gemäss einem vorbestimmten Programm die Verschiebegeschwindigkeiten steuern. Ein solches Programm berücksichtigt keine Führungsgrösse eines Giessparameters. Gemäss einem weiteren Merkmal der Erfindung ist es von besonderem Vorteil, wenn die Steuerung mit einer Regeleinrichtung verbunden ist und diese Regeleinrichtung als Führungsgrösse mindestens einen Giessparametereingang, wie Reibung zwischen Strang und Kokille, Kühlleistung der bewegten Kokillenwand, Verstellkraft gemessen am Antrieb der Bewegungseinrichtungen, Spaltgrösse zwischen bewegter Kokillenwand und Strang etc., - aufweist.The movement devices can, for example, be provided with controls which control the displacement speeds according to a predetermined program. Such a program does not take into account the reference variable of a casting parameter. According to a further feature of the invention, it is particularly advantageous if the control is connected to a control device and this control device is used as a guide variable for at least one casting parameter input, such as friction between the strand and mold, cooling capacity of the moving mold wall, adjusting force measured on the drive of the movement devices, gap size between moving mold wall and strand etc., - has.

Im nachfolgenden werden anhand von Figuren Verfahrens- und Vorrichtungsbeispiele beschrieben. Dabei zeigen :

  • Figuren 1-3 Geschwindigkeits-Zeitdiagramme verschiedener Verfahrensbeispiele und
  • Figur 4 einen Schnitt durch eine teilweise dargestellte Plattenkokille.
Process and device examples are described below with the aid of figures. Show:
  • Figures 1-3 speed-time diagrams of various process examples and
  • Figure 4 shows a section through a partially shown plate mold.

In Fig. 1 ist auf der Abszisse 10 die Zeit und auf der Ordinate 11 die Verschiebegeschwindigkeit aufgetragen. Die beim Verändern der Abmessungen eines Stranges während eines laufenden Gusses üblicherweise vorgesehenen drei Verfahrensschritte sind wie folgt dargestellt:1 shows the time on the abscissa 10 and the displacement speed on the ordinate 11. The three process steps usually provided when changing the dimensions of a strand during a running casting are shown as follows:

Zwischen Null und 1 wird mindestens eine der bewegbaren Kokillenwände mittels zwei in Stranglaufrichtung hintereinander vorgesehenen Bewegungseinrichtungen in Form von Spindeln verschwenkt. In den meisten Fällen werden zwei Kokillenwände gleichzeitig verstellt. Die Verschwenkgeschwindigkeit 5 der der Kokillenaustrittseite näheren Spindel ist kleiner als die Verschwenkgeschwindigkeit 6 der der Kokilleneingiesseite näheren Spindel. Die Schwenkachse wird während dieser Verschwenkbewegung vielfach an die austrittseitige Kante der Kokillenwand gelegt. Zwischen 1 und 2 ist der zweite Verfahrensschritt dargestellt, welcher sich durch eine Parallelverschiebung der Kokillenwand kennzeichnet. Die beiden Spindeln weisen die gleiche Verstellgeschwindigkeit auf. Während der Parallelverschiebung kann zusätzlich die der Strangbreitenänderung angepasste Giesskonuskorrektur überlagert werden.Between zero and 1, at least one of the movable mold walls is pivoted in the form of spindles by means of two movement devices provided one behind the other in the strand running direction. In most cases, two mold walls are adjusted at the same time. The pivoting speed 5 of the spindle closer to the mold exit side is smaller than the pivoting speed 6 of the spindle closer to the mold injection side. During this pivoting movement, the swivel axis is often placed on the exit-side edge of the mold wall. The second method step is shown between 1 and 2, which is characterized by a parallel displacement of the mold wall. The two spindles have the same adjustment speed. During the parallel shift, the casting cone correction adapted to the strand width change can also be superimposed.

Der dritte Verfahrensschritt, welcher das Zurückschwenken beinhaltet, findet im Zeitraum zwischen 2 und 3 statt. Die der Kokillenaustrittseite nähere Spindel bewegt sich während der Rückschwenkbewegung mit konstanter Geschwindigkeit 7, während sich die andere Spindel in diesem Zeitraum mit einer linear abnehmenden Geschwindigkeit 8 bewegt. Dabei ändert sich während des ganzen Zeitabschnittes der Rückschwenkbewegung der Kokillenwand das gegenseitige Verhältnis der Verschiebegeschwindigkeiten der beiden Spindeln. Im weiteren wird auch die Lage der Verschwenkachse während des ganzen Zeitabschnittes stetig verschoben.The third process step, which involves swiveling back, takes place in the period between 2 and 3. The spindle closer to the mold exit side moves at a constant speed 7 during the pivoting-back movement, while the other spindle moves at a linearly decreasing speed 8 during this period. The mutual ratio of the displacement speeds of the two spindles changes during the entire period of the pivoting-back movement of the mold wall. Furthermore, the position of the pivot axis is continuously shifted throughout the entire period.

In Fig. 2 ist in einem weiteren Geschwindigkeits-Zeitdiagramm eine andere Rückschwenkcharakteristik dargestellt. Die Bewegungsabläufe im ersten und zweiten Zeitabschnitt sind gegenüber Fig. 1 unverändert. Im dritten Zeitabschnitt zwischen 2 und 3 bewegen sich die beiden Spindeln während der Rückschwenkbewegung mit unterschiedlich linear abnehmender Geschwindigkeit nach den Linien 12 und 13. Die der Kokilleneingiesseite nähere Spindel kommt dabei beim Zeitpunkt 3' zum Stillstand, während die andere Spindel sich noch bis zum Zeitpunkt 3 mit stetig abnehmender Geschwindigkeit 12 weiterbewegt. Als Variante zur Linie 12 ist eine Verschwenkgeschwindigkeit 14 während der Rückschwenkbewegung nach einer Kurve 14 höherer Ordnung dargestellt. Je nach Lage und Charakteristik der Kurve kann das Verhältnis LuftspaltNerformung der Strangkruste verändert und entsprechend den Giessparametern optimiert werden.Another swing-back characteristic is shown in FIG. 2 in a further speed-time diagram. The movement sequences in the first and second time period are unchanged compared to FIG. 1. In the third time period between 2 and 3, the two spindles move at different linearly decreasing speeds according to lines 12 and 13 during the swiveling back movement 3 moved at a steadily decreasing speed 12. As a variant of line 12, a swiveling speed 14 is shown during the swiveling back movement according to a curve 14 of a higher order. Depending on the position and characteristics of the curve, the ratio of the air gap to the deformation of the strand crust can be changed and optimized according to the casting parameters.

In Fig. 3 sind auch im ersten Zeitabschnitt während der Verschwenkbewegung Uebergangskurven 21 und 22 für die Geschwindigkeitszu-. nahme dargestellt. Im dritten Zeitabschnitt wird die der Kokilleneingiessseite nähere Bewegungseinrichtung während der Rückschwenkung ab Rückschwenkbeginn mit einer linear abnehmenden Geschwindigkeit nach der Linie 23 bewegt, während die andere Bewegungseinrichtung bei Rückschwenkbeginn vorerst mit einer konstanten Geschwindigkeit 24 während eines ersten Teiles der Rückschwenkzeit und während eines zweiten Teiles der Rückschwenkzeit mit einer linear abnehmenden Geschwindigkeit 25 bewegt wird. Diese Rückschwenkcharakteristik ergab bei einer Kokille mit 600 mm Nutzlänge, einer Giessgeschwindigkeit von 1 m/min und einer Gesamtzeit für die drei Verfahrensschritte von 2,5 min für einen Verstellweg von 50 mm ein störungsfreies Verändern der Strangabmessungen. In der Regel werden mit Vorteil bei Plattenkokillen gleichzeitig beide Schmalseiten bewegt.In FIG. 3, transition curves 21 and 22 for the speed increase are also shown in the first period during the pivoting movement. shown. In the third period, the movement device closer to the mold pouring side is moved at a linearly decreasing speed along the line 23 during the return swing from the beginning of the return swing, while the other movement device at the beginning of the return swing initially at a constant speed 24 during a first part of the return swing time and during a second part of the swing back time is moved at a linearly decreasing speed 25. With a mold with a useful length of 600 mm, a casting speed of 1 m / min and a total time for the three process steps of 2.5 min for an adjustment path of 50 mm, this swing-back characteristic resulted in a trouble-free change in the strand dimensions. As a rule, both narrow sides are advantageously moved simultaneously with plate molds.

Neben den beschriebenen Geschwindigkeitsverläufen kann die Verschiebegeschwindigkeit während der Bewegung der Kokillenwand sich auch diskontinuierlich, beispielsweise treppenförmig, verändern.In addition to the speed profiles described, the displacement speed can also change discontinuously, for example in a step-like manner, during the movement of the mold wall.

In Fig. 4 sind an einer zwischen zwei Längswänden 34 angeordneten, verstellbaren Querwand 30 einer Plattenkokille zwei in Stranglängsachse 31 hintereinander angeordnete Bewegungseinrichtungen 32, 33 für die Formatveränderung angelenkt. Diese Bewegungseinrichtungen 32, 33 sind als Spindeln ausgebildet, wobei die Bewegungseinrichtung 32 die der Kokilteneingiessseite nähere und 33 die der Kokillenaustrittseite nähere Bewegungseinrichtung darstellt. Die Bewegungseinrichtungen 32, 33 sind mit Antrieben 36, 37 versehen, die ihrerseits mit Steuerungen 38, 39 zum Einstellen der Verschiebegeschwindigkeit versehen sind. Die vorbestimmten Verschiebegeschwindigkeiten der beiden unabhängig angetriebenen Bewegungseinrichtungen werden über einen programmierbaren Rechner 40 gesteuert. Zusätzlich zu dieser vorprogrammierbaren Steuerung kann der Rechner 40 mit einer Regeleinrichtung 41 versehen sein, die als Führungsgrösse zum Rechenprogramm mindestens einen Giessparametereingang, wie Reibungswert 42 zwischen Strang und Kokille, Kühlleistung 43 der bewegten Kokillenwand, Verstellkraft 44 gemessen am Antrieb der Bewegungseinrichtungen und/oder Spaltgrösse 45 zwischen bewegter Kokillenwand und Strang, auswertet. Anstelle der Spindeln 32, 33 können auch andere Bewegungseinrichtungen, wie weggesteuerte Hydraulikzylinder etc., verwendet werden.In FIG. 4, two moving devices 32, 33 for changing the format are articulated on an adjustable transverse wall 30 of a plate mold arranged between two longitudinal walls 34. These movement devices 32, 33 are designed as spindles, the movement device 32 representing the movement device closer to the mold injection side and 33 the movement device closer to the mold exit side. The movement devices 32, 33 are provided with drives 36, 37, which in turn are provided with controls 38, 39 for adjusting the displacement speed. The predetermined displacement speeds of the two independently driven movement devices are controlled by a programmable computer 40. In addition to this preprogrammable control, the computer 40 can be provided with a control device 41 which, as a guide variable for the computer program, has at least one casting parameter input, such as the friction value 42 between the strand and the mold, cooling capacity 43 of the moving mold wall, adjusting force 44 measured on the drive of the movement devices and / or gap size 45 between moving mold wall and strand, evaluates. Instead of the spindles 32, 33, other movement devices, such as path-controlled hydraulic cylinders etc., can also be used.

Während der Verschwenk- bzw. Rückschwenkbewegung wird die bewegbare Kokillenwand um eine quer zur Stranglängsachse und parallel zur Kokillenwand verlaufende Schwenkachse bewegt. Für die Abläufe gemäss den Figuren 1-3 wird dabei mindestens während eines Zeitabschnittes der Rückschwenkbewegung die Lage der fiktiven Verschwenkachse 50 parallel zu ihrer Ausgangslage verschoben. Es sind Verschwenkachsen 50 denkbar, die mit der Begrenzungsfläche des Formhohlraumes der bewegbaren Kokillenwand zusammenfallen oder die ausserhalb der Kokillenwand liegen.During the pivoting or backward pivoting movement, the movable mold wall is moved about a pivot axis running transversely to the longitudinal axis of the strand and parallel to the mold wall. For the processes according to FIGS. 1-3, the position of the fictitious pivot axis 50 is shifted parallel to its starting position at least during a period of the pivoting back movement. Pivotal axes 50 are conceivable which coincide with the boundary surface of the mold cavity of the movable mold wall or which lie outside the mold wall.

Das Verfahren zum Verändern der Abmessungen eines Stranges beinhaltet sowohl das Vergrösseren als auch das Verkleinern des Strangformates.The process for changing the dimensions of a strand includes both enlarging and reducing the size of the strand.

Claims (9)

1. A method of changing the dimensions of a strand in continuous casting while casting is proceeding, wherein at least one movable mould wall is displaced about an axis of rotation, extending transversely of the longitudinal axis of the strand and parallel to the mould wall, and is pushed transversely of the longitudinal axis of the strand by means of at least two displacement devices arranged one behind the other in the direction in which the strand moves, characterized in that, at least during part of the time in which rotational movement of the mould wall takes place, the mutual relationship between the speeds of movement of the two displacement devices is altered, so that the position of the axis of rotation (50) is displaced parallel to its initial position.
2. A method according to Claim 1, characterized in that one of the two displacement devices is moved at constant speed during the rotational movement, and the other displacement device is moved at a linearly varying speed during the rotational movement.
3. A method according to Claim 1, characterized in that the two displacement devices are moved at different linearly varying speeds during the totational movement.
4. A method according to Claim 1, characterized in that the displacement device nearer to the inlet end of the mould is moved at a linearly diminishing speed during return rotational movement as from the commencement of this movement, whereas the displacement device nearer to the outlet end of the mould is first moved, upon commencement of the return rotational movement, at a constant speed during a first part of the time required for the return rotational movement, and, during a second part of the time required for the return rotational movement, is moved at a linearly diminishing speed.
5. A method according to Claim 1, characterized in that the speed of movement of at least one displacement device is varied during the rotational movement in accordance with a transition curve of higher order.
6. A method according to Claim 1, characterized in that the speed of movement of at least one displacement device is intermittently varied during the rotational movement.
7. A method according to any one of Claims 1-6, characterized in that a displacement movement of the mould wall, approximately transverse of the direction of movement of the strand, is superposed upon the rotational movement.
8. Apparatus for performing the method of any one of Claims 1-7, wherein the movable mould wall is provided with two displacement devices for altering the shape of product, which are arranged one behind the other in the direction of movement of the strand, characterized in that each of the two displacement devices (32, 33) is provided with a control means (36, 37) for setting the speeds of movement, and in that this control means (36, 37) is connected to a programmable computer (40).
9. Apparatus according to Claim 8, characterized in that the control means (36, 37) is connected to an additional regulating device (41) and this regulating device has at least one casting parameter forming a control variable.
EP80106617A 1979-11-02 1980-10-29 Method and device for changing the dimensions of a strand during continuous casting Expired EP0028766B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80106617T ATE3103T1 (en) 1979-11-02 1980-10-29 METHOD AND DEVICE FOR CHANGING THE DIMENSIONS OF A STRAND DURING CONTINUOUS CASTING.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH983679A CH643763A5 (en) 1979-11-02 1979-11-02 METHOD AND DEVICE FOR CHANGING CROSS-SECTION DIMENSIONS OF A STRAND IN CONTINUOUS CASTING.
CH9836/79 1979-11-02

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EP0028766A1 EP0028766A1 (en) 1981-05-20
EP0028766B1 true EP0028766B1 (en) 1983-04-20

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US (1) US4356862A (en)
EP (1) EP0028766B1 (en)
JP (1) JPS5674354A (en)
AT (1) ATE3103T1 (en)
BR (1) BR8006995A (en)
CA (1) CA1158831A (en)
CH (1) CH643763A5 (en)
DE (1) DE3062844D1 (en)
ES (1) ES496908A0 (en)
MX (1) MX154223A (en)
ZA (1) ZA806725B (en)

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JPS5973155A (en) * 1982-10-20 1984-04-25 Nippon Steel Corp Quick changing method of slab width
FR2548059A1 (en) * 1983-06-28 1985-01-04 Fives Cail Babcock Method for increasing the width of a continuously-cast slab without interrupting casting
JPS6012256A (en) * 1983-07-01 1985-01-22 Nippon Steel Corp Continuous casting method with variable width
JPS6068137A (en) * 1983-08-30 1985-04-18 Nippon Steel Corp Continuous casting method of steel with variable width
AU551521B2 (en) * 1983-08-11 1986-05-01 Nippon Steel Corporation Method for reducing or widening mould width during continuous casting
FR2552692B1 (en) * 1983-10-04 1985-11-08 Fives Cail Babcock METHOD FOR MODIFYING THE WIDTH OF A CONTINUOUS CASTING SLAME WITHOUT INTERRUPTING THE CASTING
FR2555079B1 (en) * 1983-11-23 1986-03-28 Fives Cail Babcock PROCESS FOR MODIFYING THE WIDTH OF A SLAB PRODUCED IN CONTINUOUS CASTING WITHOUT INTERRUPTING THE CASTING
AU554019B2 (en) * 1984-11-09 1986-08-07 Nippon Steel Corporation Changing slab width in continuous casting
DE3501716A1 (en) * 1985-01-19 1986-07-24 Mannesmann AG, 4000 Düsseldorf METHOD AND DEVICE FOR ADJUSTING THE NARROW SIDE PANELS OF A CONTINUOUS CHOCOLATE IN CONTINUOUSLY CASTING METALS, ESPECIALLY STEEL
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Also Published As

Publication number Publication date
ZA806725B (en) 1981-10-28
ATE3103T1 (en) 1983-05-15
MX154223A (en) 1987-06-19
JPS5674354A (en) 1981-06-19
JPS6229139B2 (en) 1987-06-24
US4356862A (en) 1982-11-02
EP0028766A1 (en) 1981-05-20
ES8201862A1 (en) 1982-01-01
CA1158831A (en) 1983-12-20
CH643763A5 (en) 1984-06-29
ES496908A0 (en) 1982-01-01
DE3062844D1 (en) 1983-05-26
BR8006995A (en) 1981-05-05

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