EP0052598B1 - Device for horizontal continuous casting - Google Patents

Device for horizontal continuous casting Download PDF

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Publication number
EP0052598B1
EP0052598B1 EP81890169A EP81890169A EP0052598B1 EP 0052598 B1 EP0052598 B1 EP 0052598B1 EP 81890169 A EP81890169 A EP 81890169A EP 81890169 A EP81890169 A EP 81890169A EP 0052598 B1 EP0052598 B1 EP 0052598B1
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Prior art keywords
motor
strand
withdrawal
rom
microprocessor
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EP81890169A
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German (de)
French (fr)
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EP0052598A1 (en
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Max Ahrens
Manfred Dipl.-Ing. Haissig
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Boehler AG
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Boehler 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
    • B22D11/20—Controlling or regulating processes or operations for removing cast stock

Definitions

  • the invention relates to a device for horizontal continuous casting with a fixed sliding mold, one or more pairs of gripper rollers driven by a DC motor, which act directly on the strand, for gradually pulling the strand out of the mold according to the preamble of claim 1.
  • the strand which has not yet fully solidified is drawn off from a stationary or oscillating mold.
  • the strand withdrawal takes place discontinuously, i.e. step by step, depending on the process, a pause is made between the individual steps or the strand is pushed back a little, whereby the pushing back should take into account the thermal expansion on the one hand and on the other hand should cause the individual strand skin sections that form in the mold to be firmly welded together.
  • the first arrangement consists of jaws which grip the strand and move it a little, the fixation of the jaws on the strand being released and these returning to the starting position and engaging the strand again, whereupon the movement process is repeated.
  • This type of drive is inexact, because on the one hand large masses, etc. the jaws have to be moved so that appropriately dimensioned gears are used which have a relatively large clearance, and there is also the difficulty that the jaws do not always grasp the strand at exactly the same point, so that further inaccuracy occurs when the strand is pulled off.
  • a more precise control of the strand withdrawal can be achieved if gripper rollers directly engage the strand, since with this strand withdrawal there is constant contact between the strand and the gripper rollers, which is a prerequisite for the exact strand withdrawal.
  • a device for the batchwise conveying of a metallic casting strand wherein a pair of conveying rollers, which is driven by a gear, alternately acts on the strand and additionally executes a reciprocating movement along the strand axis.
  • a clamping device for the strand is additionally provided. This device is of a relatively complicated design and does not allow a completely exact movement sequence, so that the disadvantages already mentioned occur.
  • a device for horizontal continuous casting with a fixed slide mold and a pair of gripping rollers driven by a DC motor for gradually pulling the strand out of the mold is known, the DC motor being connected to a control unit and this in a program-dependent setting duration and sequence Outputs pulse trains, which are fed to the DC motor.
  • the actual power transmission is not carried out by the DC motor, but by an electrohydraulic stepper motor.
  • An electrohydraulic stepper motor is to be understood as a combination of a stepper motor and a hydraulic motor, the electric stepper motor driving a control valve which controls the pressure medium supply to the hydraulic motor, whereby regulation of the speed of the hydraulic motor can be achieved.
  • a device for the step-by-step pulling of a strand from a horizontal continuous casting mold in which the pair of gripper rollers is driven by a step-by-step DC motor.
  • the motor To control the motor, on the one hand its speed is determined analogously and the angle of rotation of the gripping rollers is determined digitally.
  • the movement of the gripper rollers cannot be directly deduced from the rotational speed of the motor, since the power transmission system between the motor and gripper rollers has a game. With the digital determination of the gripper roller movement, the movement of the strand can be determined, which in turn serves to regulate the rotational speed of the motor.
  • this device provides that a pause is maintained when a predetermined torque is exceeded, as a result of which waiting for the strand skin ring formed to be detached from the mold.
  • This device is complicated and prone to failure, so that in many cases the required Operational security is not given.
  • the aim of the invention is to avoid these disadvantages and to propose a device of the type mentioned at the outset which is distinguished by a simple structure and ensures a particularly exact deduction.
  • a device for horizontal continuous casting with a fixed sliding mold one or more pairs of gripper rollers, which are driven by a step-by-step DC motor and act directly on the strand, for gradually pulling the strand out of the mold, the motor being connected to a control unit , which issues control commands in program-dependent adjustable duration and sequence, wherein a pulse generator digitally monitoring the angle of rotation of the motor and a downstream up-down counter are provided, which is characterized in that at least one gripper roller and the DC motor have a common axis or the axes the same are coupled directly to one another and the up-down counter is connected to a microprocessor which in turn is connected to a ROM which stores the pulses specified for each sub-step of the motor, and which by means of the difference between the Counts and signals corresponding to the given pulses, preferably via a digital-to-analog converter, controls a pulse-length modulating DC amplifier which supplies the DC motor.
  • the combination of the direct coupling of the drive motor and the gripping roller with the new movement sequence control according to the invention allows a very precise control of the device to be achieved with relatively little effort, in which the lengths of the pulses per unit of time change in such a way that a pulse changes due to the pulse length modulating DC amplifier uniform change in the strand speed results, since each step is further divided into sub-steps, so that the desired speed profile is reproducibly maintained in each step.
  • An optimal strand surface can thus be obtained, in which no disruptive notches occur even in the region of the collision of the individual annular strand sections. Then there is the possibility that after each sub-step a correction of the draw-off distance can take place with the next sub-step, with which each step corresponds exactly to the conditions set.
  • ROM read only memory
  • RAM random access memory
  • Interface used here and later have the meanings as they come from Georg Franz: Technical Words of Electronics, Franzis-Verlag, Kunststoff (1980) pages 78 , 75 and 41.42 emerge.
  • encoder used later means encryption device, see also “encoded” and “encoding” in De Vries: Engish-German Technical and Engineering Dictionary, McGraw-Hill, New York, 1 edition (1960), page 294.
  • the microprocessor is connected to a further ROM which stores the sequence of steps of the starting process.
  • the microprocessor is further connected to a time interval generator serving to specify the withdrawal time via a timer .
  • FIG. 1 shows a block diagram
  • FIG. 2 shows a diagram of the speed sequence during a step.
  • the strand 1 is gradually pulled out of the mold 2, which is firmly connected to the melt container 3. It attacks the pair of gripping rollers 4a and 4b directly on the strand.
  • the gripping roller 4a sits on the axis of the DC motor 5.
  • the motor is connected to an encoder E, which delivers 20,000 pulses per motor revolution to the up or down counter Z.
  • the predetermined for each individual sub-step pulses are compared via the interface 1 1 and the microprocessor M to the ROM. 1
  • the microprocessor via the interface 1 2 and the digital-analog converter K and the pulse width modulating direct current amplifier V, the length of the motor 5 supplied pulses.
  • the microprocessor M is also connected to the time interval generator W via a timer T.
  • the withdrawal time which is specified depending on the alloy to be processed, can be set by the time interval generator W.
  • the exact movement sequence for the starting process is stored in ROM 2.
  • the number of sub-steps required forwards and backwards per step is stored in RAM.
  • the start-up takes place via the on-off switch S and the interface 1 3 , the program being predetermined by the program selector P.
  • the step-by-step DC motor does not have its own axis.
  • the rotor which has the winding, which is supplied with the current pulses via four brushes, has a cylindrical recess for the axis of the gripping roller 4a.
  • the outside diameter of the rotor is approx. 70 cm and the inside diameter is approx. 50 cm. This design of the engine enables a high torque to be achieved even when the engine is starting up.
  • the stator has the permanent magnet part.
  • the diagram shown in Fig. 2 shows the speed change of the strand withdrawal.
  • the strand is slowly moved until a maximum speed is reached, whereupon the speed is slowly reduced and then the strand is pushed back.
  • the entire step takes 1.1 seconds and the individual sub-steps are at least 1/20 seconds apart or less. Due to the constant change in the strand speed, a shock-like movement of the liquid metal in the strand shell, which is still very thin and thus mechanically unstable, is avoided, so that a homogeneous structure of the strand can be achieved.

Abstract

An apparatus for continuous horizontal casting with a stationary mold and the casting method accomplished with such apparatus contemplates employing at least one gripper roll pair which directly engages a casting which is then withdrawn in steps or incrementally from the mold. At least one roll of each roll pair is driven by a stepping DC-motor to which it is directly coupled. Each casting withdrawal step can be divided into substeps which are controllable to produce a uniform preset speed pattern during each step.

Description

Die Erfindung bezieht sich auf eine Vorrichtung zum horizontalen Stranggießen mit fest stehender Gleitkokille, einem oder mehreren, über Gleichstrommotor angetriebenen Greifrollenpaaren, die direkt am Strang angreifen, zum schrittweisen Ausziehen des Stranges aus der Kokille gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a device for horizontal continuous casting with a fixed sliding mold, one or more pairs of gripper rollers driven by a DC motor, which act directly on the strand, for gradually pulling the strand out of the mold according to the preamble of claim 1.

Beim horizontalen Stranggießen von Metallen, insbesondere von höher schmelzenden Legierungen wird der noch nicht vollständig verfestigte Strang aus einer fest stehenden bzw. oszillierend bewegten Kokille abgezogen. Der Strangabzug erfolgt hierbei diskontinuierlich, d.h. schrittweise, wobei je nach Verfahren zwischen den einzelnen Schritten eine Pause eingehalten wird oder der Strang ein Stück zurückgeschoben wird, wobei das Zurückschieben einerseits die Wärmedehnung berücksichtigen und andererseits ein festes Verschweißen der einzelnen sich jeweils bildenden Stranghautabschnitte in der Kokille bewirken soll.In the case of horizontal continuous casting of metals, in particular of higher-melting alloys, the strand which has not yet fully solidified is drawn off from a stationary or oscillating mold. The strand withdrawal takes place discontinuously, i.e. step by step, depending on the process, a pause is made between the individual steps or the strand is pushed back a little, whereby the pushing back should take into account the thermal expansion on the one hand and on the other hand should cause the individual strand skin sections that form in the mold to be firmly welded together.

Zum Abzug des Stranges aus der Kokille sind wieder zwei verschiedene prinzipielle Anordnungen bekannt. Die erste Anordnung besteht aus Backen, die an den Strang angreifen und diesen ein Stück bewegen, wobei die Fixierung der Backen am Strang aufgehoben wird und diese wieder in die Ausgangslage zurückkehren und erneut am Strang angreifen, worauf der Bewegungsvorgang wiederholt wird. Diese Art des Antriebes ist unexakt, da einerseits große Massen, u.zw. die Backen, bewegt werden müssen, sodaß entsprechend dimensionierte Getriebe Anwendung finden, die ein relativ großes Spiel aufweisen, wobei weiters die Schwierigkeit besteht, daß die Backen nicht immer exakt an derselben Stelle den Strang erfassen, sodaß eine weitere Ungenauigkeit beim Abzug des Stranges eintritt.Two different basic arrangements are again known for withdrawing the strand from the mold. The first arrangement consists of jaws which grip the strand and move it a little, the fixation of the jaws on the strand being released and these returning to the starting position and engaging the strand again, whereupon the movement process is repeated. This type of drive is inexact, because on the one hand large masses, etc. the jaws have to be moved so that appropriately dimensioned gears are used which have a relatively large clearance, and there is also the difficulty that the jaws do not always grasp the strand at exactly the same point, so that further inaccuracy occurs when the strand is pulled off.

Der genaue Bewegungsablauf beim Strangabzug ist jedoch nicht alleine aus Gründen der Produktionsgeschwindigkeit von besonderer Bedeutung, sondern auch für die Erreichung eines hochwertigen Stranggußproduktes bedeutsam. Erfolgt der Strangabzug derart, daß keine Verschweißung zwischen dem neu gebildeten Stranghautring und der restlichen Stranghaut stattfindet und wird die Stranghaut weiter abgezogen, so kommt es zu einem Austritt der Schmelze aus der Kokille, womit der Strangguß sofort abgebrochen werden muß.The exact sequence of movements when pulling off the strand is of particular importance not only for reasons of production speed, but also for achieving a high-quality continuous casting product. If the strand is drawn off in such a way that there is no welding between the newly formed strand skin ring and the remaining strand skin and if the strand skin is pulled off further, the melt escapes from the mold, with which the continuous casting must be stopped immediately.

Eine exaktere Regelung des Strangabzuges kann dann erreicht werden, wenn Greifrollen an den Strang direkt angreifen, da bei diesem Strangabzug ein ständiger Kontakt zwischen Strang und Greifrollen vorliegt, der eine Voraussetzung für den exakten Strangabzug darstellt.A more precise control of the strand withdrawal can be achieved if gripper rollers directly engage the strand, since with this strand withdrawal there is constant contact between the strand and the gripper rollers, which is a prerequisite for the exact strand withdrawal.

Aus der DE-PS 1 583 611 ist eine Vorrichtung zum absatzweisen Fördern eines metallischen Gießstranges bekannt, wobei ein Förderrollenpaar, das über ein Getriebe angetrieben wird, alternierend an den Strang angreift und zusatzlich eine hin- und hergehende Bewegung entlang der Strangachse ausführt. Um eine Reproduzierbarkeit der Strangbewegung zu erhalten, ist zusätzlich eine Klemmvorrichtung für den Strang vorgesehen. Diese Vorrichtung ist relativ kompliziert ausgeführt und erlaubt keinen vollkommen exakten Bewegungsablauf, sodaß die bereits angeführten Nachteile auftreten.From DE-PS 1 583 611 a device for the batchwise conveying of a metallic casting strand is known, wherein a pair of conveying rollers, which is driven by a gear, alternately acts on the strand and additionally executes a reciprocating movement along the strand axis. In order to maintain reproducibility of the strand movement, a clamping device for the strand is additionally provided. This device is of a relatively complicated design and does not allow a completely exact movement sequence, so that the disadvantages already mentioned occur.

Aus der DE-PS 1 783 032 wird eine Vorrichtung zum horizontalen Stranggießen mit einer fest stehenden Gleitkokille und einem mit Gleichstrommotor angetriebenen Greifrollenpaar zum schrittweisen Ausziehen des Stranges aus der Kokille bekannt, wobei der Gleichstrommotor mit einem Steuergerät verbunden ist und dieses in programmabhängiger Einstelldauer und Folge Impulsfolgen abgibt, welche dem Gleichstrommotor zugeführt werden. Die eigentliche Kraftübermittlung erfolgt jedoch nicht durch den Gleichstrommotor, sondern durch einen elektrohydraulischen Schrittmotor. Unter einem elektrohydraulischen Schrittmotor ist eine Kombination aus einem Schrittmotor und einem Hydraulikmotor zu verstehen, wobei der elektrische Schrittmotor ein Steuerventil antreibt, das die Druckmittelzufuhr zum Hydraulikmotor steuert, wodurch eine Regelung der Geschwindigkeit des Hydraulikmotors erreichbar ist. Diese Anordnung verfügt zwar über das entsprechende Drehmoment für den Strangabzug, jedoch auch hier ist die erforderliche Exaktheit des Abzuges nicht immer gegeben, da einerseits Flüssigkeiten nicht vollkommen inkompressibel sind, wodurch unexakte Schrittfolgen bedingt sind und weiters ist auch hier ein hoher apparativer Aufwand erforderlich.From DE-PS 1 783 032 a device for horizontal continuous casting with a fixed slide mold and a pair of gripping rollers driven by a DC motor for gradually pulling the strand out of the mold is known, the DC motor being connected to a control unit and this in a program-dependent setting duration and sequence Outputs pulse trains, which are fed to the DC motor. However, the actual power transmission is not carried out by the DC motor, but by an electrohydraulic stepper motor. An electrohydraulic stepper motor is to be understood as a combination of a stepper motor and a hydraulic motor, the electric stepper motor driving a control valve which controls the pressure medium supply to the hydraulic motor, whereby regulation of the speed of the hydraulic motor can be achieved. Although this arrangement has the appropriate torque for the strand take-off, the required accuracy of the take-off is not always given, since on the one hand liquids are not completely incompressible, which means that inexact step sequences are required and, furthermore, a high outlay on equipment is also required here.

Aus der, den Oberbegriff des Anspruchs 1 bildenden DE-PS 2 340 636 ist eine Einrichtung zum schrittweisen Ausziehen eines Stranges aus einer horizontalen Stranggießkokille bekannt, bei welcher das Greifrollenpaar von einem schrittweise arbeitenden Gleichstrommotor angetrieben wird. Zur Steuerung des Motors wird einerseits seine Drehzahl analog bestimmt und der Drehwinkel der Greifrollen digital bestimmt. Die Bewegung der Greifrollen läßt sich nicht direkt von der Umdrehungsgeschwindigkeit des Motors rückschließen, da das Kraftübertragungssystem zwischen Motor und Greifrollen ein Spiel aufweist. Mit der digitalen Bestimmung der Greifrollenbewegung kann die Bewegung des Stranges festgelegt werden, welche ihrerseits wieder zur Regelung der Umlaufgeschwindigkeit des Motors dient. Zusätzlich ist bei dieser Vorrichtung vorgesehen, daß beim Überschreiten eines vorgegebenen Drehmomentes eine Pause eingehalten wird, wodurch ein Ablösen des sich bildenden Stranghautringes von der Kokille jeweils abgewartet werden soll. Diese Vorrichtung ist kompliziert ausgestaltet und störungsanfällig, sodaß in vielen Fällen die erforderliche Betriebssicherheit nicht gegeben ist.From DE-PS 2 340 636, which forms the preamble of claim 1, a device for the step-by-step pulling of a strand from a horizontal continuous casting mold is known, in which the pair of gripper rollers is driven by a step-by-step DC motor. To control the motor, on the one hand its speed is determined analogously and the angle of rotation of the gripping rollers is determined digitally. The movement of the gripper rollers cannot be directly deduced from the rotational speed of the motor, since the power transmission system between the motor and gripper rollers has a game. With the digital determination of the gripper roller movement, the movement of the strand can be determined, which in turn serves to regulate the rotational speed of the motor. In addition, this device provides that a pause is maintained when a predetermined torque is exceeded, as a result of which waiting for the strand skin ring formed to be detached from the mold. This device is complicated and prone to failure, so that in many cases the required Operational security is not given.

Ziel der Erfindung ist es, diese Nachteile zu vermeiden und eine Vorrichtung der eingangs erwähnten Art vorzuschlagen, die sich durch einfachen Aufbau auszeichnet und einen besonders exakten Abzug gewährleistet.The aim of the invention is to avoid these disadvantages and to propose a device of the type mentioned at the outset which is distinguished by a simple structure and ensures a particularly exact deduction.

Erfindungsgemäß wird dies erreicht, durch eine Vorrichtung zum horizontalen Stranggießen mit fest stehender Gleitkokille, einem oder mehreren, über schrittweise arbeitenden Gleichstrommotor angetriebenen Greifrollenpaaren, die direkt am Strang angreifen, zum schrittweisen Ausziehen des Stranges aus der Kokille, wobei der Motor mit einem Steuergerät verbunden ist, das Steuerbefehle in programmabhängig einstellbarer Dauer und Folge abgibt, wobei ein den Drehwinkel des Motors digital überwachender Impulsgeber und ein diesem nachgeschalteter Vorwärts-Rückwärtszähler vorgesehen sind, die dadurch gekennzeichnet ist, daß zumindest eine Greifrolle und der Gleichstrommotor eine gemeinsame Achse aufweisen bzw. die Achsen derselben direkt miteinander gekuppelt sind und der Vorwärts-Rückwärtszähler mit einem Mikroprozessor verbunden ist, der seinerseits mit einem die für jeden Teilschritt des Motors vorgegebenen Impulse speichernden ROM verbunden ist, und der mittels des Unterschiedes zwischen dem Zählerstand und den vorgegebenen Impulsen entsprechenden Signalen, vorzugsweise über einen Digital-Analogwandler, eine Impulslängen modulierenden Gleichstromverstärker steuert, welcher den Gleichstrommotor versorgt. Bei der erfindungsgemäßen Vorrichtung ist ein direkter Zusammenhang zwischen dem Drehwinkel des Motors und der Bewegungsstrecke des Stranges gegeben, wodurch die letztere sehr einfach und exakt überwachbar ist und sich Regeleingriffe sehr exakt durchführen lassen bzw. sich diese stets reproduzierbar auswirken, wodurch eine wesentliche Voraussetzung für die Erzielung besonders exakter Schrittfolgen gegeben ist. Durch die erfindungsgemäße Kombination der direkten Kopplung von Antriebsmotor und Greifrolle mit der neuen Bewegungsablaufkontrolle läßt sich mit relativ geringem Aufwand eine sehr exakte Steuerung der Vorrichtung erzielen, bei der sich aufgrund des die Impulslängen modulierenden Gleichstromverstärkers die Längen der Impulse pro Zeiteinheit derart ändern, daß sich eine gleichmäßige Änderung der Stranggeschwindigkeit ergibt, da weiters jeder Schritt in Teilschritte zerteilt wird, sodaß das erwünschte Geschwindigkeitsprofil in jedem Schritt reproduzierbar eingehalten wird. Damit ist eine optimale Strangoberfläche zu erhalten, bei welcher auch im Bereich des Zusammenstoßes der einzelnen ringförmigen Strangabschnitte keine störenden Kerben entstehen. Sodann besteht die Möglichkeit, daß nach jedem Teilschritt eine Korrektur der Abzugstrecke mit dem nächsten Teilschritt erfolgen kann, womit jeder Schritt genau den gestellten Bedingungen entspricht.According to the invention, this is achieved by a device for horizontal continuous casting with a fixed sliding mold, one or more pairs of gripper rollers, which are driven by a step-by-step DC motor and act directly on the strand, for gradually pulling the strand out of the mold, the motor being connected to a control unit , which issues control commands in program-dependent adjustable duration and sequence, wherein a pulse generator digitally monitoring the angle of rotation of the motor and a downstream up-down counter are provided, which is characterized in that at least one gripper roller and the DC motor have a common axis or the axes the same are coupled directly to one another and the up-down counter is connected to a microprocessor which in turn is connected to a ROM which stores the pulses specified for each sub-step of the motor, and which by means of the difference between the Counts and signals corresponding to the given pulses, preferably via a digital-to-analog converter, controls a pulse-length modulating DC amplifier which supplies the DC motor. In the device according to the invention, there is a direct relationship between the angle of rotation of the motor and the path of movement of the strand, as a result of which the latter can be monitored very easily and precisely, and control interventions can be carried out very precisely or these can always be reproducible, which is an essential prerequisite for the Achieving particularly precise step sequences is given. The combination of the direct coupling of the drive motor and the gripping roller with the new movement sequence control according to the invention allows a very precise control of the device to be achieved with relatively little effort, in which the lengths of the pulses per unit of time change in such a way that a pulse changes due to the pulse length modulating DC amplifier uniform change in the strand speed results, since each step is further divided into sub-steps, so that the desired speed profile is reproducibly maintained in each step. An optimal strand surface can thus be obtained, in which no disruptive notches occur even in the region of the collision of the individual annular strand sections. Then there is the possibility that after each sub-step a correction of the draw-off distance can take place with the next sub-step, with which each step corresponds exactly to the conditions set.

Die hier und später gebrauchten Fachausdrücke "ROM" (read only memory) "RAM" (random access memory) sowie "Interface" haben die Bedeutung, wie sie aus Georg Franz: Fachwörter der Elektronik, Franzis-Verlag, München (1980) Seiten 78, 75 und 41,42 hervorgehen. Die später verwendete Bezeichnung "Encoder" bedeutet Verschlüsselungseinrichtung, siehe dazu "encoded" und "encoding" in De Vries: Engish-German Technical and Engineering Dictionary, McGraw-Hill, New York, 1 Ausgabe (1960), Seite 294.The technical terms "ROM" (read only memory), "RAM" (random access memory) and "Interface" used here and later have the meanings as they come from Georg Franz: Technical Words of Electronics, Franzis-Verlag, Munich (1980) pages 78 , 75 and 41.42 emerge. The term "encoder" used later means encryption device, see also "encoded" and "encoding" in De Vries: Engish-German Technical and Engineering Dictionary, McGraw-Hill, New York, 1 edition (1960), page 294.

Zur automatischen Steuerung des Anfahrvorganges ist es vorteilhaft, wenn der Mikroprozessor mit einem weiteren, die Schrittfolge des Anfahrvorganges speichernden ROM verbunden ist.For automatic control of the starting process, it is advantageous if the microprocessor is connected to a further ROM which stores the sequence of steps of the starting process.

Um die Vorrichtung auf einfache Weise für die Verarbeitung unterschiedlicher Legierungen zu adaptieren, wobei insbesondere ohne speziell geschultes Personal das Auslangen gefunden werden soll, ist nach einem weiteren Erfindungsmerkmal vorgesehen, daß der Mikroprozessor weiters mit einem zur Vorgabe der Abzugszeit dienenden Zeitintervallgeber über einen Zeitgeber verbunden ist.In order to adapt the device in a simple manner for processing different alloys, in particular without specially trained personnel, it is intended according to a further feature of the invention that the microprocessor is further connected to a time interval generator serving to specify the withdrawal time via a timer .

Damit läßt sich durch einfaches Einstellen einer legierungsspezifischen Abzugszeit die nötige Anpassung vornehmen, ohne daß hiezu größere Eingriffe in die Steuerung erforderlich wären.This allows the necessary adjustment to be made simply by setting an alloy-specific withdrawal time without major interventions in the control being necessary.

Im folgenden wird die Erfindung an Hand der Zeichnungen näher erläutert. Es zeigen Fig. 1 ein Blockschaltbild und Fig. 2 ein Diagramm über den Geschwindigkeitsablauf während eines Schrittes.The invention is explained in more detail below with reference to the drawings. 1 shows a block diagram and FIG. 2 shows a diagram of the speed sequence during a step.

Der Strang 1 wird schrittweise aus der Kokille 2, die mit dem Schmelzenbehälter 3 fest verbunden ist, herausgezogen. Es greift hierbei das Greifrollenpaar 4a und 4b an den Strang direkt an. Die Greifrolle 4a sitzt auf der Achse des Gleichstrommotors 5. Der Motor ist mit einem Encoder E verbunden, der 20.000 Impulse pro Motorumdrehung an den Vor- bzw. Rückwärtszähler Z abgibt. Die für jeden einzelnen Teilschritt vorgegebenen Impulse werden über das Interface 11 und den Mikroprozessor M mit dem ROM 1 verglichen. Je nachdem, ob die Bewegung im Vor- bzw. Rücklauf ist, vermindert oder erhöht der Mikroprozessor über das Interface 12 und den Digital-Analogumsetzer K und den Impulslängen modulierenden Gleichstromverstärker V die Länge der dem Motor 5 zugeführten Impulse. Der Mikroprozessor M ist weiters über einen Zeitgeber T mit dem Zeitintervallgeber W verbunden. Durch den Zeitintervallgeber W kann die Abzugzeit, welche je nach der zu verarbeitenden Legierung vorgegeben wird, eingestellt werden. Im ROM 2 ist der genaue Bewegungsablauf für den Anfahrvorgang gespeichert. Im RAM sind die Anzahl der nach vorwärts und nach rückwärts erforderlichen Teilschritte pro Schritt gespeichert.The strand 1 is gradually pulled out of the mold 2, which is firmly connected to the melt container 3. It attacks the pair of gripping rollers 4a and 4b directly on the strand. The gripping roller 4a sits on the axis of the DC motor 5. The motor is connected to an encoder E, which delivers 20,000 pulses per motor revolution to the up or down counter Z. The predetermined for each individual sub-step pulses are compared via the interface 1 1 and the microprocessor M to the ROM. 1 Depending on whether the movement in the forward or backward is decreased or increased, the microprocessor via the interface 1 2 and the digital-analog converter K and the pulse width modulating direct current amplifier V, the length of the motor 5 supplied pulses. The microprocessor M is also connected to the time interval generator W via a timer T. The withdrawal time, which is specified depending on the alloy to be processed, can be set by the time interval generator W. The exact movement sequence for the starting process is stored in ROM 2. The number of sub-steps required forwards and backwards per step is stored in RAM.

Das Ingangsetzen erfolgt über den Ein-Ausschalter S und das Interface 13, wobei das Programm durch den Programmwähler P vorgegeben ist.The start-up takes place via the on-off switch S and the interface 1 3 , the program being predetermined by the program selector P.

Der schrittweise arbeitende Gleichstrommotor hat keine eigene Achse. Der Rotor, welcher die Wicklung aufweist, die über vier Bürsten mit den Stromimpulsen versorgt werden, weist eine zylindrische Ausnehmung für die Achse der Greifrolle 4a auf. Der Außendurchmesser des Rotors beträgt ca. 70 cm und der Innendurchmesser ca. 50 cm. Durch diese Ausbildung des Motors kann auch im Anfahrvorgang des Motors ein hohes Drehmoment erreicht werden. Der Stator weist den Permanentmagnetteil auf.The step-by-step DC motor does not have its own axis. The rotor, which has the winding, which is supplied with the current pulses via four brushes, has a cylindrical recess for the axis of the gripping roller 4a. The outside diameter of the rotor is approx. 70 cm and the inside diameter is approx. 50 cm. This design of the engine enables a high torque to be achieved even when the engine is starting up. The stator has the permanent magnet part.

Das in Fig. 2 dargestellte Diagramm zeigt die Geschwindigkeitsveränderung des Strangabzuges. Der Strang wird langsam in Bewegung gesetzt, bis eine Maximalgeschwindigkeit erreicht ist, worauf die Geschwindigkeit langsam verringert und sodann der Strang zurückgeschoben wird. Der gesamte Schritt dauert 1,1 Sekunden und die einzelnen Teilschritte liegen in einem Abstand von zumindest 1/20 Sekunde oder weniger. Durch die stetige Änderung der Stranggeschwindigkeit wird eine schockartige Bewegung des flüssigen Metalls in der Strangschale, die noch sehr dünn und damit mechanisch instabil ist, vermieden, sodaß ein homogener Aufbau des Stranges erreicht werden kann.The diagram shown in Fig. 2 shows the speed change of the strand withdrawal. The strand is slowly moved until a maximum speed is reached, whereupon the speed is slowly reduced and then the strand is pushed back. The entire step takes 1.1 seconds and the individual sub-steps are at least 1/20 seconds apart or less. Due to the constant change in the strand speed, a shock-like movement of the liquid metal in the strand shell, which is still very thin and thus mechanically unstable, is avoided, so that a homogeneous structure of the strand can be achieved.

Claims (3)

1. A device for horizontal continuous casting with a stationary mould, one or a plurality of pairs of withdrawal rollers driven by a d.c. motor operating stepwise, which engage directly onto the billet, for stepwise withdrawal of the billet from the mould, the motor being connected to a control apparatus which transmits control commands adjustable in respect of duration and sequence dependent on a program, there being provided a pulse emitter for digitally monitoring the angle of rotation of the motor and a forward-reverse counter arranged downstream of the pulse emitter, characterised in that at least one withdrawal roller and the d.c. motor have a common shaft or have directly interconnected shafts, and the forward-reverse counter (Z) is connected to a microprocessor (M) connected to an ROM (ROM 1) storing preset pulses for each partial pitch of the motor and controlling by means of the difference between the counter count and the signals corresponding to the preset pulses, preferably via a digital analog transducer (K), a pulse length modulating d.c. amplifier (V), supplying the d.c. motor (5).
2. A device according to claim 1, characterised in that the microprocessor (M) is connected to an additional ROM (ROM 2) storing the step sequence of the starting billet.
3. A device according to claim 1 or 2, characterised in that the microprocessor is further connected to a time interval transmitter (W) for presetting the withdrawal time via a time signaltransmitter (T).
EP81890169A 1980-11-18 1981-10-19 Device for horizontal continuous casting Expired EP0052598B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0565180A AT381882B (en) 1980-11-18 1980-11-18 DEVICE FOR HORIZONTAL CONTINUOUS CASTING
AT5651/80 1980-11-18

Publications (2)

Publication Number Publication Date
EP0052598A1 EP0052598A1 (en) 1982-05-26
EP0052598B1 true EP0052598B1 (en) 1987-04-29

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EP81890169A Expired EP0052598B1 (en) 1980-11-18 1981-10-19 Device for horizontal continuous casting

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US (1) US4602669A (en)
EP (1) EP0052598B1 (en)
JP (1) JPS57109547A (en)
AT (2) AT381882B (en)
BR (1) BR8107428A (en)
CA (1) CA1171233A (en)
DE (1) DE3176144D1 (en)
ES (1) ES8205599A1 (en)
ZA (1) ZA816631B (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4523624A (en) * 1981-10-22 1985-06-18 International Telephone And Telegraph Corporation Cast ingot position control process and apparatus
JPS60148653A (en) * 1984-01-12 1985-08-05 Kobe Steel Ltd Prevention of flaw on inside surface of casting mold in horizontal and continuous casting installation
JPS6146364A (en) * 1984-08-09 1986-03-06 Nippon Kokan Kk <Nkk> Method for controlling stop of flow in waveform and stop control for drawing in horizontal continuous casting machine
JPS6163349A (en) * 1984-09-05 1986-04-01 Nippon Kokan Kk <Nkk> Method for controlling push back rate of billet in horizontal and continuous casting installation
DE3502703A1 (en) * 1985-01-28 1986-07-31 INRESA Schultheiss GmbH, 7543 Engelsbrand EXTRACTION DEVICE FOR A CONTINUOUS CASTING MACHINE
KR910009363A (en) * 1989-11-03 1991-06-28 원본미기재 Motion control system for horizontal continuous casting machine
US5293925A (en) * 1990-12-26 1994-03-15 Kawasaki Jukogyo Kabushiki Kaisha Method of and apparatus for withdrawing strand in horizontal continuous casting installation
ES2759779T3 (en) * 2011-07-08 2020-05-12 Primetals Technologies Germany Gmbh Procedure and apparatus for manufacturing long metal products in a continuous casting

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2815551A (en) * 1955-06-21 1957-12-10 British Iron Steel Research Method of and apparatus for the casting of metal
US3575230A (en) * 1968-03-07 1971-04-20 Albert Calderon Method of making steel
DE1783032C3 (en) * 1968-09-21 1974-01-03 Siemens Ag, 1000 Berlin U. 8000 Muenchen Device for controlling the step-by-step drawing of a strand from a horizontal continuous casting mold
GB1380582A (en) * 1971-01-19 1975-01-15 Davy Int Ltd Method of continuously casting metal and apparatus therefor
DE2110548C3 (en) * 1971-03-05 1975-03-27 Siemens Ag, 1000 Berlin Und 8000 Muenchen Device for controlling the step-by-step drawing of a strand from a horizontal continuous casting mold
US3726333A (en) * 1971-07-07 1973-04-10 Gen Motors Corp Control of continuous casting operation
DE2340636C3 (en) * 1973-08-10 1980-04-24 Siemens Ag, 1000 Berlin Und 8000 Muenchen Device for the step-by-step extraction of a strand from a horizontal continuous casting mold
DE2511913A1 (en) * 1975-03-19 1976-09-30 Sack Gmbh Maschf CONTINUOUS CASTING PLANT FOR SLABS
GB1524760A (en) * 1976-08-02 1978-09-13 Uss Eng & Consult Multistrand continuouscasting machine
JPS5424224A (en) * 1977-07-27 1979-02-23 Ishikawajima Harima Heavy Ind Intermittent and continuous driving apparatus in horizontal continuous casting machine

Also Published As

Publication number Publication date
JPH0134707B2 (en) 1989-07-20
US4602669A (en) 1986-07-29
ZA816631B (en) 1983-02-23
DE3176144D1 (en) 1987-06-04
EP0052598A1 (en) 1982-05-26
BR8107428A (en) 1982-08-10
CA1171233A (en) 1984-07-24
AT381882B (en) 1986-12-10
JPS57109547A (en) 1982-07-08
ES505708A0 (en) 1982-06-16
ATA565180A (en) 1986-05-15
ATE26807T1 (en) 1987-05-15
ES8205599A1 (en) 1982-06-16

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