EP1043096B1 - Process of measuring the frictional force between the strand and the mould at continuous casting - Google Patents

Process of measuring the frictional force between the strand and the mould at continuous casting Download PDF

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Publication number
EP1043096B1
EP1043096B1 EP00106592A EP00106592A EP1043096B1 EP 1043096 B1 EP1043096 B1 EP 1043096B1 EP 00106592 A EP00106592 A EP 00106592A EP 00106592 A EP00106592 A EP 00106592A EP 1043096 B1 EP1043096 B1 EP 1043096B1
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EP
European Patent Office
Prior art keywords
friction
mould
mold
forces
continuous casting
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EP00106592A
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German (de)
French (fr)
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EP1043096A1 (en
Inventor
Albrecht Dr. Girgensohn
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SMS Siemag AG
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SMS Schloemann Siemag AG
Schloemann Siemag AG
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • 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
    • B22D11/166—Controlling or regulating processes or operations for mould oscillation
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/053—Means for oscillating the moulds

Definitions

  • the invention relates to a method for determining the friction between Strand shell and mold during continuous casting by means of an oscillating mold, whereby using regulated double-acting hydraulic cylinders the pressures each of both chambers of all oscillation cylinders.
  • the frictional force between the mold wall and the strand shell is determined by a normal force caused, which acts on the strand shell.
  • the normal force mainly arises as a result of the ferrostatic pressure that the steel melt has on the inside of the strand Strand shell exercises.
  • An additional portion of the frictional force is from the conical Employment of the mold narrow sides caused.
  • the direction of the frictional force changes periodically during the oscillation movement by 180 °.
  • conventional molds are stationary in both directions Condition about the same coefficient of friction reached.
  • the influence of the strand shell bending on the normal force is the frictional force in molds with a decreasing cross-section during the phase of the positive strip significantly higher than during the negative strip.
  • the measurement of the frictional relationships between the strand shell and Chill mold is also essential because the mold friction acts as a pulsating disturbance variable on the strand.
  • the document JP 61 052973 A describes a method for predicting breakthroughs in continuous casting with oscillating mold, the oscillation by double-acting hydraulic cylinders is produced.
  • the pressures of the pressure and traction chamber of the hydraulic cylinder are applied measured the feed lines.
  • the state of friction i.e. the frictional force between Strand shell and mold wall is from a change in the difference between these two Press known. From this, an upcoming breakthrough can be predicted, if these pressures are measured continuously.
  • the object of the invention to provide a method of the type mentioned in the preamble of claim 1, which while avoiding the aforementioned disadvantages and difficulties with comparatively little technical effort and without any noteworthy Modifications to the mold or oscillation device delivers clean measurement signals, no external sensors and / or vibration models required and continuously online for monitoring a trouble-free operating state necessary operating data, especially for determining the friction between Strand shell and mold supplies.
  • the method according to the invention for determining the friction between the strand shell and mold during continuous casting can be used with all continuous casting machines use that are equipped with a hydraulic mold oscillation.
  • This data is recorded at a specified measuring frequency. from that can be placed online and offline at any time between strand shell and calculate the mold friction force.
  • An embodiment of the method according to the invention provides that the determined Frictional forces are assigned to the current casting speed. In order to a change in the casting speed is sufficiently compensated as a disruptive factor.
  • a further embodiment of the method according to the invention provides that the Acceleration forces depending on the respective stroke position in the cold run is determined without friction forces, with corresponding acceleration forces including the frictional forces in intact casting operation compared TARGET values of the permissible frictional forces are derived.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Casting Devices For Molds (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Abstract

Strand skin friction is determined from data collected for regulating continuous casting mould oscillation. The friction between a strand skin and an oscillating continuous casting mould is determined by recording the pressure betw the two chambers of all the regulated double-acting hydraulic cylinders used as oscillation cylinders as well as the associated piston stroke positions with a predetermined measurement frequency and using the data for calculating the frictional force at ea instant.

Description

Die Erfindung betrifft ein Verfahren zur Bestimmung der Reibung zwischen Strangschale und Kokille beim Stranggießen mittels oszillierbarer Kokille, wobei unter Verwendung geregelter doppelt wirkender Hydraulikzylinder die Drücke jeweils beider Kammern aller Oszillationszylinder aufgenommen werden.The invention relates to a method for determining the friction between Strand shell and mold during continuous casting by means of an oscillating mold, whereby using regulated double-acting hydraulic cylinders the pressures each of both chambers of all oscillation cylinders.

Die Reibkraft zwischen Kokillenwand und Strangschale wird durch eine Normalkraft verursacht, welche auf die Strangschale wirkt. Bei konventionellen Kokillen mit planparallelen Kokillenplatten entsteht die Normalkraft hauptsächlich als Folge des ferrostatischen Drucks, den die Stahlschmelze im Stranginnem auf die Strangschale ausübt. Ein zusätzlicher Anteil der Reibkraft wird von der konischen Anstellung der Kokillenschmalseiten verursacht.The frictional force between the mold wall and the strand shell is determined by a normal force caused, which acts on the strand shell. With conventional molds with plane-parallel mold plates, the normal force mainly arises as a result of the ferrostatic pressure that the steel melt has on the inside of the strand Strand shell exercises. An additional portion of the frictional force is from the conical Employment of the mold narrow sides caused.

Bei Kokillen mit zum Kokillenaustritt abnehmendem Querschnitt, bspw. Trichterkokillen, entsteht eine zusätzliche Normalkraft aus der Rückbiegung der Strangschale beim Transport durch die Kokille.In the case of molds with a decreasing cross section to the mold outlet, for example funnel molds, there is an additional normal force from the bending back of the strand shell when transported through the mold.

Die Höhe der Reibkraft FR ist entsprechend Gleichung (1) sowohl von der Normalkraft Fn als vom Reibkoeffizienten µ abhängig. FR = Fn x µ The magnitude of the frictional force F R is dependent on the normal force F n and the coefficient of friction μ in accordance with equation (1). F R = F n x µ

Der Reibkoeffizient µ wird im wesentlichen von Schmierbedingungen zwischen Strang und Kokille bestimmt. Diese ergeben sich aus:

  • Wahl bzw. Qualität des Schmiermittels, bspw. Gießpulver oder Öl,
  • Aufgabemenge des Schmiermittels,
  • Zustand des Schmiermittels nach Viskosität, Zusammensetzung und Aufbau,
  • Wärmeabfuhr aus den Kokillenplatten,
  • Relativgeschwindigkeit zwischen Strangschale und Kokille.
The coefficient of friction µ is essentially determined by the lubrication conditions between the strand and the mold. These result from:
  • Choice or quality of the lubricant, for example casting powder or oil,
  • Feed quantity of the lubricant,
  • Condition of the lubricant according to viscosity, composition and structure,
  • Heat dissipation from the mold plates,
  • Relative speed between the strand shell and the mold.

Die Richtung der Reibkraft ändert sich während der Oszillationsbewegung periodisch um 180°. In konventionellen Kokillen werden in beiden Richtungen im stationären Zustand etwa die gleichen Reibwerte erreicht. Wegen des zusätzlichen Einflusses der Strangschalenbiegung auf die Normalkraft sind dagegen die Reibkräfte in Kokillen mit abnehmendem Querschnitt während der Phase des Positivstrips deutlich höher als während des Negativstrips.The direction of the frictional force changes periodically during the oscillation movement by 180 °. In conventional molds are stationary in both directions Condition about the same coefficient of friction reached. Because of the additional In contrast, the influence of the strand shell bending on the normal force is the frictional force in molds with a decreasing cross-section during the phase of the positive strip significantly higher than during the negative strip.

Moderne Stranggießverfahren erfordern ein Höchstmaß an Verfügbarkeit von Anlage und Prozeß, weil unerwartete schmierungsbedingte Änderungen im Gießprozeß sowohl eine erhebliche Qualitätsminderung des Gießprodukts wie auch Betriebsunterbrechungen zur Folge haben können. Infolgedessen ist für einen störungsfreien Betrieb eine möglichst vollständige Anlagenautomatisierung mit permanenter Online-Überwachung aller wesentlichen Betriebsdaten eine dringende Voraussetzung. Nur hierdurch können auftretende Fehler in der Entstehungstendenz frühzeitig genug erkannt und durch entsprechende Gegenmaßnahmen kompensiert werden.Modern continuous casting processes require the highest level of system availability and process because of unexpected lubrication-related changes in the casting process both a considerable reduction in the quality of the cast product and business interruptions can result. As a result, is for trouble-free Operation of a system automation that is as complete as possible with permanent Online monitoring of all essential operating data is an urgent Requirement. This is the only way to avoid errors in the development tendency recognized early enough and compensated by appropriate countermeasures become.

Hierzu bedarf es insbesondere einer kontinuierlichen Messung der Reibverhältnisse zwischen Strangschale und Kokille, um daraus Erkenntnisse über den Betriebszustand bzw. die Funktionsverhältnisse in der Kokille zu gewinnen, um nach Maßgabe dieser Informationen den Stranggießprozeß zu überwachen und betriebstechnisch zu optimieren.This requires in particular a continuous measurement of the friction conditions between the strand shell and the mold in order to gain knowledge about the operating status or to gain the functional relationships in the mold in order to Providing this information to monitor the continuous casting process and operational to optimize.

Die meßtechnische Erfassung der Reibverhältnisse zwischen Strangschale und Kokille ist auch deswegen von wesentlicher Bedeutung, weil die Kokillenreibkraft als pulsierende Störgröße auf den Strang wirkt.The measurement of the frictional relationships between the strand shell and Chill mold is also essential because the mold friction acts as a pulsating disturbance variable on the strand.

Ziel der Online-Überwachung sind dabei:

  • Verbesserung der Oberflächenqualität des Stranges durch Optimierung der Schmierbedingungen,
  • kontinuierliche Überwachung der Strangschmierung und der Oszillationsbedingungen mit der Möglichkeit einer Reaktion auf systematische Veränderungen,
  • rechtzeitige Warnung vor schädlichen Ereignissen, wie bspw. Durchbruch, die sich mit einer erkennbaren Tendenz zur Veränderung der Kokillenreibung ankündigen.
Online monitoring aims to:
  • Improving the surface quality of the strand by optimizing the lubrication conditions,
  • continuous monitoring of the line lubrication and the oscillation conditions with the possibility of a reaction to systematic changes,
  • Timely warning of harmful events, such as breakthrough, which announce themselves with a recognizable tendency to change the mold friction.

Verfahren zur Bestimmung der Reibkraft zwischen Strang und Kokille sind beim Stand der Technik bekannt. Sie unterscheiden sich vor allem in der Wahl des Meßortes und des angewandten Meßverfahrens.Methods for determining the frictional force between the strand and the mold are available at State of the art known. They differ mainly in the choice of Measurement site and the measurement method used.

Das Dokument Concast News 12, 1973, Seiten 6 bis 8, beschreibt in dem Bericht "Determination of frictional forces between strand and mould", Verfasser M. Schmid, ein Verfahren, bei welchem die Kokille auf zwei Kraftmeßdosen montiert wird. Um ein Auftreten von zusätzlichen Kräften, bspw. durch thermische Verformung, zu vermeiden, ist die Führung der Kokille in reibungsarmen Nadellagern erforderlich. Zusätzlich zu den Kräften werden die Gießgeschwindigkeit, die Kokillenbewegung, die Kokillengeschwindigkeit, die auftretenden Kräfte sowie die Kokillenbeschleunigung gemessen. Aus diesen Daten wird die Kokillenreibung berechnet.The document Concast News 12, 1973, pages 6 to 8, describes in the report "Determination of frictional forces between strand and mold", author M. Schmid, a process in which the mold is mounted on two load cells becomes. To prevent additional forces from occurring, e.g. due to thermal deformation, Avoid guiding the mold in low-friction needle bearings required. In addition to the forces, the casting speed, the mold movement, the mold speed, the forces and the Mold acceleration measured. The mold friction becomes from this data calculated.

Das Dokument "Fachberichte Hüttenpraxis" Metallweiterverarbeitung, Vol. 20, No. 4, 1982 stellt unter dem Titel On the Importance of Mould Friction Control in continuous Casting of Steel" ein Verfahren zur Reibungsmessung vor, welches auf Beschleunigungsmessungen an der Kokille beruht. Dafür wird ein Meßkopf, der an der Kokille befestigt wird, sowie eine aufwendige elektronische Signalverarbeitung benötigt.The document "Technical reports metallurgical practice" metal processing, Vol. 20, No. 4, 1982, entitled On the Importance of Mold Friction Control in continuous Casting of Steel "a method for measuring friction, which is based on Acceleration measurements based on the mold. For this, a measuring head is attached to the mold is attached, as well as complex electronic signal processing needed.

Das Dokument "Vortrag zur Veranstaltung 3. Duisburger Stranggießtage am 7.18. März 1991" berichtet unter dem Titel Einsatz fortgeschrittener Verfahren zur Zustandsüberwachung von Kokillenhub- und ―gießmaschine", Verfasser M. Perkuhn, E. Höffgen, H.J. Strodhoff und P.M. Frank" über ein Verfahren zur Kraftmessung an der Exzenter-Hubstange, bei welchem als Meßgröße für die Reibkraftmessung die Kraft in der Hubstange des Exzenters sowie der Motorstrom und die Drehzahl des Exzenterantriebs, Hubweg sowie Hubfrequenz und Kühlwasserdruck verwendet wird. Aus einem Modell-Ersatzsystem, das aus Massen, Federn und Dämpfern aufgebaut ist, werden parallel dazu die Kräfte berechnet, die ohne den Einfluß der Kokillenreibung allein aus der Oszillationsbewegung zu erwarten wären. Aus einem Vergleich der gemessenen mit den erwarteten Kräften in der Hubstange läßt sich dann die Kokillenreibung bestimmen.The document "Lecture on the event 3rd Duisburg Continuous Casting Days on 7.18. March 1991 "reports on the use of advanced condition monitoring techniques of mold lifting and casting machine ", author M. Perkuhn, E. Höffgen, H.J. Strodhoff and P.M. Frank "on a procedure for force measurement on the eccentric lifting rod, which is used as a measurement for measuring the friction force the force in the lifting rod of the eccentric as well as the motor current and the speed of the eccentric drive, stroke, stroke frequency and cooling water pressure becomes. From a model replacement system consisting of masses, springs and dampers the forces are calculated in parallel, which without the influence of the Mold friction would be expected from the oscillation movement alone. From a Comparison of the measured with the expected forces in the lifting rod lets then determine the mold friction.

Nachteile der zuvor beschriebenen Verfahren sind u.a.:

  • ein großer konstruktiver und meßtechnischer Aufwand, der erforderlich ist, um saubere Meßsignale zu gewinnen;
  • erforderliche Umbauten an Kokille und/oder Oszillationseinrichtung sowie Kokillenführung;
  • zusätzliche externe Applikation von Messaufnehmern, die gepflegt, gewartet und regelmäßig überprüft werden müssen;
  • ein erforderlicher Abgleich der Messwerte mit Schwingungsmodellen bzw. einer Interpretation mit Hilfe aufwendiger elektronischer Signalverarbeitung.
Disadvantages of the previously described methods include:
  • a great constructive and metrological effort that is required to obtain clean measurement signals;
  • necessary modifications to the mold and / or oscillation device and mold guide;
  • additional external application of sensors, which must be maintained, maintained and checked regularly;
  • a necessary comparison of the measured values with vibration models or an interpretation using complex electronic signal processing.

Das Dokument JP 61 052973 A beschreibt ein Verfahren zum Vorhersagen von Durchbrüchen beim Stranggießen mit oszillierender Kokille, wobei die Oszillation durch doppelt wirkende Hydraulikzylinder erzeugt wird.The document JP 61 052973 A describes a method for predicting breakthroughs in continuous casting with oscillating mold, the oscillation by double-acting hydraulic cylinders is produced.

Dazu werden die Drücke der Druck- und Zugkammer des Hydraulikzylinders an dessen Zuleitungen gemessen. Der Reibzustand, also die Reibkraft zwischen Strangschale und Kokillenwand ist aus einer Änderung der Differenz dieser beiden Drücke bekannt. Daraus lässt sich ein anbahnender Durchbruch vorhersehen, wenn diese Drücke kontinuierlich gemessen werden.For this purpose, the pressures of the pressure and traction chamber of the hydraulic cylinder are applied measured the feed lines. The state of friction, i.e. the frictional force between Strand shell and mold wall is from a change in the difference between these two Press known. From this, an upcoming breakthrough can be predicted, if these pressures are measured continuously.

Ausgehend vom vorgenannten Stand der Technik liegt der Erfindung die Aufgabe zugrunde, ein Verfahren der im Oberbegriff von Anspruch 1 genannten Art anzugeben, welches unter Vermeidung vorgenannter Nachteile und Schwierigkeiten mit vergleichsweise geringem messtechnischem Aufwand sowie ohne nennenswerte Umbauten an Kokille oder Oszillationseinrichtung saubere Messsignale liefert, keine externen Messaufnehmer und/oder Schwingungsmodelle erfordert und fortlaufend online die zur Überwachung eines störungsfreien Betriebszustandes erforderlichen Betriebsdaten, insbesondere für die Bestimmung der Reibung zwischen Strangschale und Kokille liefert.Starting from the aforementioned prior art, the object of the invention to provide a method of the type mentioned in the preamble of claim 1, which while avoiding the aforementioned disadvantages and difficulties with comparatively little technical effort and without any noteworthy Modifications to the mold or oscillation device delivers clean measurement signals, no external sensors and / or vibration models required and continuously online for monitoring a trouble-free operating state necessary operating data, especially for determining the friction between Strand shell and mold supplies.

Zur Lösung der Aufgabe ist bei einem Verfahren der eingangs genannten Art zur Bestimmung der Reibung zwischen Strangschale und Kokille entsprechend Anspruch 1 unter Verwendung geregelter doppelt wirkender Hydraulikzylinder vorgesehen, dass diesen Drücken entsprechende Hubpositionen der Kolben mittels vorgebbarer Messfrequenzen zugeordnet werden und für die Abhängigkeit der Beschleunigungskräfte von der jeweiligen Hubposition ermittelte Daten um die Störgrößen:

  • aktuelles Kokillengewicht
  • Beschleunigungskräfte aus der Kokillenbewegung
    korrigiert werden, und
aus diesen Daten die zu jedem Zeitpunkt zwischen der Strangschale und der Kokille wirkende Reibkraft berechnet wird.To achieve the object is provided in a method of the type mentioned for determining the friction between the strand shell and mold according to claim 1 using controlled double-acting hydraulic cylinders that these pressures corresponding stroke positions of the pistons are assigned by means of predetermined measurement frequencies and for the dependence of the acceleration forces of data determined for the respective stroke position around the disturbance variables:
  • current mold weight
  • Accelerating forces from the mold movement
    be corrected, and
From this data the frictional force acting at all times between the strand shell and the mold is calculated.

Das erfindungsgemäße Verfahren zur Bestimmung der Reibung zwischen Strangschale und Kokille beim Stranggießen läßt sich bei allen Stranggießmaschinen anwenden, die mit einer hydraulischen Kokillenoszillation ausgestattet sind.The method according to the invention for determining the friction between the strand shell and mold during continuous casting can be used with all continuous casting machines use that are equipped with a hydraulic mold oscillation.

Mit Vorteil werden zur Reibkraftbestimmung ausschließlich Messgrößen verwendet, die zur Steuerung und Regelung der Oszillationsbewegung ohnehin benötigt und mit ausreichender Genauigkeit aufgenommen werden. Es sind dies die im Hauptanspruch angegebenen Messdaten, nämlich:

  • die Oszilfations-Drücke in beiden Kammern aller Hydraulikzylinder und
  • die aktuelle erreichbare Position der Zylinderkolben nach Maßgabe der druckabhängigen Beschleunigungskräfte und diesen entgegenwirkenden Reibungskräften.
For the determination of the frictional force, it is advantageous to use only measurement variables which are required anyway for the control and regulation of the oscillation movement and which are recorded with sufficient accuracy. These are the measurement data specified in the main claim, namely:
  • the oscillation pressures in both chambers of all hydraulic cylinders and
  • the currently achievable position of the cylinder pistons in accordance with the pressure-dependent acceleration forces and these counteracting frictional forces.

Diese Daten werden mit einer vorgegebenen Messfrequenz aufgenommen. Daraus lässt sich online und offline die zu jedem Zeitpunkt zwischen Strangschale und Kokillenwand wirkende Reibkraft berechnen. This data is recorded at a specified measuring frequency. from that can be placed online and offline at any time between strand shell and calculate the mold friction force.

Dazu müssen die aus den gemessenen Zylinderdrücken und -positionen ermittelten Zylinderkräfte um die Hauptstörgrößen: aktuelles Kokillengewicht, sowie Beschleunigungskräfte aus der Kokillenbewegung korrigiert werden.To do this, the cylinder pressures and positions measured must be determined Cylinder forces around the main disturbance variables: current mold weight and acceleration forces be corrected from the mold movement.

Als Vorteile des Verfahrens nach der Erfindung sind zu nennen:

  • Es erfordert keinen konstruktiven bzw. meßtechnischen Aufwand zur Gewinnung der Messdaten, weil diese bereits für die Regelung der Oszillationsbewegung benötigt werden und deshalb mit ausreichender Genauigkeit vorliegen;
  • infolgedessen sind auch keine Umbauten an Kokillen und/oder Oszillationseinrichtungen erforderlich;
  • ebensowenig benötigt das erfindungsgemäße Verfahren extern zu applizierende Meddaufnehmer, wobei dann auch deren Pflege, Wartung und Überprüfung entfällt.
Advantages of the method according to the invention are:
  • It does not require any design or measurement technology to obtain the measurement data, because these are already required for the control of the oscillation movement and are therefore available with sufficient accuracy;
  • consequently, no modifications to molds and / or oscillation devices are required;
  • the method according to the invention does not need any external transducers either, and their care, maintenance and inspection are then also omitted.

Weitere Ausgestaltungen des Verfahrens nach der Erfindung sind entsprechend den Unteransprüchen vorgesehen.Further refinements of the method according to the invention are corresponding provided the subclaims.

Eine Ausgestaltung des Verfahrens nach der Erfindung sieht vor, dass die ermittelten Reibungskräfte der aktuellen Gießgeschwindigkeit zugeordnet werden. Damit ist eine Änderung der Gießgeschwindigkeit als Störfaktor ausreichend kompensiert. An embodiment of the method according to the invention provides that the determined Frictional forces are assigned to the current casting speed. In order to a change in the casting speed is sufficiently compensated as a disruptive factor.

Eine weitere Ausgestaltung des erfindungsgemäßen Verfahrens sieht vor, daß die Beschleunigungskräfte in Abhängigkeit von der jeweiligen Hubposition im Kaltdurchlauf ohne Reibungskräfte ermittelt wird, mit entsprechenden Beschleunigungskräften einschließlich der Reibungskräfte im intakten Gießbetrieb verglichen wird und daraus SOLL-Werte der zulässigen Reibungskräfte abgeleitet werden.A further embodiment of the method according to the invention provides that the Acceleration forces depending on the respective stroke position in the cold run is determined without friction forces, with corresponding acceleration forces including the frictional forces in intact casting operation compared TARGET values of the permissible frictional forces are derived.

Weiterhin ist vorgesehen, daß beim Stranggießen einer Charge die Meßdaten fortlaufend online beobachtet und registriert und dabei die zu jedem Zeitpunkt wirkende Reibungskraft online berechnet und bei erkennbaren Änderungen Gegenmaßnahmen eingeleitet bzw. bei erkennbarer Durchbruchsgefahr der Gießprozeß gestoppt wird.It is also provided that the measurement data during continuous casting of a batch continuously observed and registered online and the one that is active at all times Frictional force is calculated online and countermeasures are taken when changes become apparent initiated or if there is a recognizable breakthrough risk, the casting process is stopped.

Und schließlich kann mit dem Verfahren nach der Erfindung vorgesehen sein, daß bei steigender Tendenz der Reibkraft zwischen Strang und Kokille die Zugabe von Schmiermitteln überprüft und die Schmiermittelzugabe verändert wird.And finally it can be provided with the method according to the invention that with increasing tendency of the friction force between the strand and the mold, the addition of Lubricants checked and the lubricant addition is changed.

Die wichtigsten Merkmale des mit der Erfindung vorgeschlagenen Verfahrens zur Messung der Reibkraft zwischen Strang und Kokille sind:

  • Das Verfahren läßt sich bei allen Kokillenoszillationen, unabhängig von der Bauart, anwenden, wenn zur Erzeugung der Oszillationsbewegung geregelte Hydraulikzylinder verwendet werden;
  • zur Bestimmung der Reibkraft werden Meßgrößen verwendet, die zur Regelung der Oszillationsbewegung ebenfalls erforderlich sind, und deshalb bereits mit ausreichender Geschwindigkeit vorliegen;
  • die Meßdaten werden mit einer geeigneten vorzugebenden Meßfrequenz aufgenommen;
  • die Umrechnung der Meßdaten in aktuelle Kokillenreibung erfolgt über einfache mathematische Zusammenhänge und kann online erfolgen. Dabei wird das aktuelle Kokillengewicht sowie die Beschleunigungskräfte aus der Kokillenbewegung kompensiert;
  • es sind keine zusätzlichen Ein- bzw. Umbauten an Kokille und/oder Oszillationseinrichtung erforderlich.
The most important features of the method proposed by the invention for measuring the frictional force between the strand and the mold are:
  • The method can be used for all mold oscillations, regardless of the type, if controlled hydraulic cylinders are used to generate the oscillating movement;
  • To determine the friction force, measured variables are used which are also necessary for regulating the oscillation movement and which are therefore already available at a sufficient speed;
  • the measurement data are recorded with a suitable measurement frequency to be specified;
  • The conversion of the measurement data into current mold friction is done using simple mathematical relationships and can be done online. The current mold weight and the acceleration forces from the mold movement are compensated for;
  • no additional installations or conversions to the mold and / or oscillation device are required.

Claims (5)

  1. Method of determining the friction between strip skin and mould in continuous casting by means of an oscillatory mould, wherein with use of regulated double-acting hydraulic cylinders the pressures of in each instance two chambers of all oscillation cylinders are recorded, characterised in that corresponding stroke positions of the pistons are associated with these pressures by means of predeterminable measuring frequencies and data ascertained for the dependence of the acceleration forces on the respective stroke position are corrected by the disturbance variables of actual mould weight and acceleration forces from the mould movement, and the friction force acting at any instant between the strip skin and the mould is calculated from these data.
  2. Method according to claim 1, characterised in that the ascertained friction forces are continuously associated with the actual casting speed.
  3. Method according to claim 1 or 2, characterised in that the acceleration forces are ascertained in dependence on the respective stroke position in cold running without friction forces and compared with corresponding acceleration forces inclusive of friction forces in casting operation and target values of the permissible friction forces are derived therefrom.
  4. Method according to one or more of claims 1 to 3, characterised in that during continuous casting of a charge the measurement data of the friction force acting at any instant are continuously observed on-line and registered and that countermeasures are initiated in the case of recognisable changes or the casting process is stopped in the case of a recognisable risk of breakage.
  5. Method according to claim 4, characterised in that in the case of a tendency of the friction force between strip and mould to rise the feed of lubricant is examined and the feed is varied.
EP00106592A 1999-04-03 2000-03-28 Process of measuring the frictional force between the strand and the mould at continuous casting Expired - Lifetime EP1043096B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19915269A DE19915269A1 (en) 1999-04-03 1999-04-03 Procedure for determining the friction between the continuous shell and the mold during continuous casting
DE19915269 1999-04-03

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EP1043096A1 EP1043096A1 (en) 2000-10-11
EP1043096B1 true EP1043096B1 (en) 2004-05-12

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EP (1) EP1043096B1 (en)
JP (1) JP2000317596A (en)
KR (1) KR100704181B1 (en)
CN (2) CN1269271A (en)
AT (1) ATE266489T1 (en)
CA (1) CA2303641A1 (en)
DE (2) DE19915269A1 (en)
MX (1) MXPA00003247A (en)

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KR101204955B1 (en) 2010-07-29 2012-11-26 현대제철 주식회사 Apparatus for monitoring frictional force in mold and method therefor
WO2014003269A1 (en) * 2012-06-28 2014-01-03 현대제철 주식회사 Breakout prevention method in continuous casting
CN110579300B (en) * 2019-08-20 2022-10-25 北京数钰科技发展有限公司 Dynamic analysis method and device for friction force between crystallizer and casting blank and electronic equipment
CN110517240B (en) * 2019-08-22 2022-06-03 联峰钢铁（张家港）有限公司 Method and device for judging continuous casting machine state

Citations (1)

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JPS6152972A (en) * 1984-08-24 1986-03-15 Nippon Kokan Kk <Nkk> Method for predicting breakout in continuous casting

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GB1556616A (en) * 1976-06-18 1979-11-28 British Steel Corp Steelmaking
IT1117559B (en) * 1978-01-17 1986-02-17 Centre Rech Metallurgique PROCEDURE AND DEVICE FOR THE CONTROL AND REGULATION OF THE CONTINUOUS CASTING OF METALS
DE3005801C2 (en) * 1980-02-13 1983-11-10 Mannesmann AG, 4000 Düsseldorf Process to avoid breakthroughs in continuous casting plants
AT366607B (en) * 1980-07-11 1982-04-26 Voest Alpine Ag FURNISHING ON AN OSCILLATING CONTINUOUS CHILLING
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JPH0235622B2 (en) * 1984-08-24 1990-08-13 Nippon Kokan Kk RENZOKUCHUZONIOKERUBUREEKUAUTOYOCHIHOHO
JPS6152974A (en) * 1984-08-24 1986-03-15 Nippon Kokan Kk <Nkk> Method for predicting breakout in continuous casting
AT381878B (en) * 1984-09-10 1986-12-10 Voest Alpine Ag CONTINUOUS CHOCOLATE
DE3543790A1 (en) * 1985-12-09 1987-06-11 Mannesmann Ag OSCILLATION DEVICE
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LU88393A1 (en) * 1993-08-20 1995-03-01 Wurth Paul Sa Continuous casting ingot mold
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JPS6152972A (en) * 1984-08-24 1986-03-15 Nippon Kokan Kk <Nkk> Method for predicting breakout in continuous casting

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DE19915269A1 (en) 2000-10-26
CA2303641A1 (en) 2000-10-03
ATE266489T1 (en) 2004-05-15
DE50006374D1 (en) 2004-06-17
CN101391289A (en) 2009-03-25
CN1269271A (en) 2000-10-11
JP2000317596A (en) 2000-11-21
MXPA00003247A (en) 2004-10-28
EP1043096A1 (en) 2000-10-11
KR100704181B1 (en) 2007-04-06
US6487504B1 (en) 2002-11-26
KR20000071539A (en) 2000-11-25

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