EP1043096A1 - 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
EP1043096A1
EP1043096A1 EP00106592A EP00106592A EP1043096A1 EP 1043096 A1 EP1043096 A1 EP 1043096A1 EP 00106592 A EP00106592 A EP 00106592A EP 00106592 A EP00106592 A EP 00106592A EP 1043096 A1 EP1043096 A1 EP 1043096A1
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Prior art keywords
mold
friction
forces
strand
casting
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EP00106592A
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German (de)
French (fr)
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EP1043096B1 (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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    • 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 using an oscillating mold.
  • 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 arises mainly 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 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 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 provide clean measurement signals, no external sensors and / or vibration models required and continuously online to monitor a trouble-free operating status required operating data, in particular for determining the friction between Strand shell and mold supplies.
  • the invention provided that using regulated double acting Hydraulic cylinders the pressures of both chambers of all oscillation cylinders, as well as the stroke positions of the pistons that can be assigned to these pressures with a predefinable one Measuring frequency recorded and from this data at any time friction force acting between the strand shell and the mold walls is calculated becomes.
  • 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.
  • An embodiment of the method according to the invention provides that the determined Frictional forces assigned to the current casting speed and with it be continuously compared. This is a change in the casting speed adequately 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 and the TARGET values of the permissible friction forces are derived from it.
  • Another embodiment of the method according to the invention provides that as further influencing parameter parameters for steel quality, casting temperature, casting speed be taken into account when calculating the friction force.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Casting Devices For Molds (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (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.The invention relates to a method for determining the friction between Strand shell and mold during continuous casting using an oscillating mold.

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 Stranginnern 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 arises mainly 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 friction force F R is dependent on the normal force F n and on the friction coefficient 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,
  • Quantity of 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 reached about the same coefficient of friction. 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.
The aim of online monitoring is:
  • 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

Figure 00030001
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
Figure 00030001
Determination of frictional forces between strand and mold ", author M. Schmid, a method in which the mold is mounted on two load cells. In order to avoid the occurrence of additional forces, for example due to thermal deformation, the mold must be guided in In addition to the forces, the casting speed, the mold movement, the mold speed, the forces occurring and the mold acceleration are measured, and the mold friction is calculated from this data.

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 provides under the title On the Importance of Mold Friction Control in continuous Casting of Steel "a method for friction measurement based on acceleration measurements on the mold. For this a measuring head, which is attached to the mold, and complex electronic signal processing are required.

Das Dokument Vortrag zur Veranstaltung 3. Duisburger Stranggießtage am 7./8. 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 March 1991 "reports under the title Use of advanced methods for condition monitoring of mold lifting and ießgießmaschine ", author M. Perkuhn, E. Höffgen, HJ Strodhoff and PM Frank" on a method for force measurement on the eccentric lifting rod, in which the force in the Stroke of the eccentric and the motor current and speed of the eccentric drive, stroke and stroke frequency and cooling water pressure is used. From a model replacement system, which is made up of masses, springs and dampers, the forces are calculated in parallel that would be expected from the oscillation movement without the influence of mold friction alone. The mold friction can then be determined from a comparison of the measured forces with the expected forces in the lifting rod.

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 regularly checked;
  • a necessary comparison of the measured values with vibration models or an interpretation using complex electronic signal processing.

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 provide clean measurement signals, no external sensors and / or vibration models required and continuously online to monitor a trouble-free operating status required operating data, in particular for determining the friction between Strand shell and mold supplies.

Zur Lösung der Aufgabe ist bei einem Verfahren der eingangs genannten Art mit der Erfindung vorgesehen, daß unter Verwendung geregelter doppelt wirkender Hydraulikzylinder die Drücke jeweils beider Kammern aller Oszillationszylinder, sowie die diesen Drücken zuordenbaren Hubpositionen der Kolben mit einer vorgebbaren Meßfrequenz aufgenommen und aus diesen Daten die zu jedem Zeitpunkt zwischen der Strangschale und den Kokillenwänden wirkende Reibkraft berechnet wird.To solve the problem is with a method of the type mentioned the invention provided that using regulated double acting Hydraulic cylinders the pressures of both chambers of all oscillation cylinders, as well as the stroke positions of the pistons that can be assigned to these pressures with a predefinable one Measuring frequency recorded and from this data at any time friction force acting between the strand shell and the mold walls is calculated becomes.

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 Drücke in beiden Kammern aller Hydraulikzylinder der Oszillation und
  • die aktuelle Position der Zylinderkolben.
For the determination of the frictional force, it is advantageous to use only measurement quantities 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 pressures in both chambers of all hydraulic cylinders of the oscillation and
  • the current position of the cylinder pistons.

Diese Daten werden mit einer vorgegebenen Meßfrequenz aufgenommen. Daraus läßt sich mit geringem mathematischen Aufwand online und offline die zu jedem Zeitpunkt zwischen Strangschale und Kokillenwand wirkende Reibkraft berechnen.These data are recorded with a predetermined measuring frequency. Out of it can be done online and offline with little mathematical effort Calculate the moment of friction between the strand shell and the mold wall.

Dazu müssen jedoch die aus den gemessenen Zylinderdrücken ermittelten Zylinderkräfte um die Hauptstörgrößen: aktuelles Kokillengewicht, sowie Beschleunigungskräfte aus der Kokillenbewegung korrigiert werden.However, this requires the cylinder forces determined from the measured cylinder pressures around the main disturbance variables: current mold weight and acceleration forces can 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 Meßaufnehmer, 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;
  • as a result, no modifications to molds and / or oscillation devices are required;
  • the method according to the invention also does not require measuring sensors to be applied externally, in which case their care, maintenance and checking are also omitted.

Eine Ausgestaltung des Verfahrens nach der Erfindung sieht vor, daß die ermittelten Reibungskräfte der aktuellen Gießgeschwindigkeit zugeordnet und mit dieser laufend verglichen 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 assigned to the current casting speed and with it be continuously compared. This is a change in the casting speed adequately 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 and the TARGET values of the permissible friction forces are derived from it.

Eine weitere Ausgestaltung des Verfahrens nach der Erfindung sieht vor, daß als weitere Einflußgröße Parameter für die Stahlqualität, Gießtemperatur, Gießgeschwindigkeit bei der Berechnung der Reibkraft mit berücksichtigt werden.Another embodiment of the method according to the invention provides that as further influencing parameter parameters for steel quality, casting temperature, casting speed be taken into account when calculating the friction force.

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 detected when changes are detected 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 frictional 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 (7)

Verfahren zur Bestimmung der Reibung zwischen Strangschale und Kokille beim Stranggießen mittels oszillierbarer Kokille,
dadurch gekennzeichnet,
daß unter Verwendung geregelter doppelt wirkender Hydraulikzylinder die Drücke jeweils beider Kammern aller Oszillationszylinder, sowie die diesen Drücken zugeordneten Hubpositionen der Kolben mit einer vorgebbaren Meßfrequenz aufgenommen und aus diesen Daten die zu jedem Zeitpunkt zwischen der Strangschale und den Kokillenwänden wirkende Reibkraft berechnet wird.Method for determining the friction between the strand shell and the mold during continuous casting using an oscillatable mold,
characterized,
that using regulated double-acting hydraulic cylinders, the pressures of both chambers of all oscillation cylinders, as well as the stroke positions of the pistons assigned to these pressures, are recorded with a predeterminable measuring frequency, and from this data the frictional force acting at all times between the strand shell and the mold walls is calculated. Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
daß die für die Abhängigkeit der Beschleunigungskräfte von der jeweiligen Hubposition ermittelten Daten um die Störgrößen aktuelles Kokillengewicht Beschleunigungskräfte aus der Kokillenbewegung korrigiert werden. Method according to claim 1,
characterized,
that the data determined for the dependence of the acceleration forces on the respective stroke position about the disturbance variables current mold weight Accelerating forces from the mold movement Getting corrected. Verfahren nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß die ermittelten Reibungskräfte der aktuellen Gießgeschwindigkeit zugeordnet und mit dieser laufend verglichen werden.The method of claim 1 or 2,
characterized,
that the determined frictional forces are assigned to the current casting speed and are continuously compared with this. Verfahren nach einem oder mehreren der Ansprüche 1 bis 3,
dadurch gekennzeichnet,
daß die Beschleunigungskräfte in Abhängigkeit von der jeweiligen Hubposition im Kaltdurchlauf ohne Reibungskräfte ermittelt und mit entsprechenden Beschleunigungskräften einschließlich der Reibungskräfte im Gießbetrieb verglichen und daraus SOLL-Werte der zulässigen Reibungskräfte abgeleitet werden.Method according to one or more of claims 1 to 3,
characterized,
that the acceleration forces are determined as a function of the respective stroke position in the cold run without friction forces and compared with corresponding acceleration forces including the friction forces in the casting operation, and target values of the permissible friction forces are derived therefrom. Verfahren nach einem oder mehreren der Ansprüche 1 bis 4,
dadurch gekennzeichnet,
daß als weitere Einflußgrößen Parameter für die Stahlqualität Gießtemperatur Gießgeschwindigkeit bei der Berechnung der Reibkraft mit berücksichtigt werden.Method according to one or more of claims 1 to 4,
characterized,
that as further influencing parameters for the Steel quality Casting temperature Casting speed be taken into account when calculating the friction force. Verfahren nach einem oder mehreren der Ansprüche 1 bis 5,
dadurch gekennzeichnet,
daß beim Stranggießen einer Charge die Meßdaten fortlaufend online beobachtet und registriert werden und dabei die zu jedem Zeitpunkt wirkende Reibkraft online berechnet und bei erkennbaren Änderungen Gegenmaßnahmen eingeleitet werden bzw. bei erkennbarer Durchbruchsgefahr der Gießprozeß gestoppt wird. Method according to one or more of claims 1 to 5,
characterized,
that during continuous casting of a batch, the measurement data are continuously monitored and registered online, and the frictional force acting at all times is calculated online and countermeasures are initiated if there are any noticeable changes or the casting process is stopped if there is a recognizable risk of breakthrough. Verfahren nach Anspruch 6,
dadurch gekennzeichnet,
daß bei steigender Tendenz der Reibkraft zwischen Strang und Kokille die Zugabe von Schmiermitteln überprüft und die Schmiermittelzugabe verändert wird.Method according to claim 6,
characterized,
that with increasing tendency of the frictional force between the strand and the mold, the addition of lubricants is checked and the addition of lubricant is changed.
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

Publications (2)

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

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EP (1) EP1043096B1 (en)
JP (1) JP2000317596A (en)
KR (1) KR100704181B1 (en)
CN (2) CN101391289A (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

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GB2012637A (en) * 1978-01-17 1979-08-01 Centre Rech Metallurgique Controlling the continuous casting of metals
GB1556616A (en) * 1976-06-18 1979-11-28 British Steel Corp Steelmaking
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JPS6152974A (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
GB2012637A (en) * 1978-01-17 1979-08-01 Centre Rech Metallurgique Controlling the continuous casting of metals
DE3005801A1 (en) * 1980-02-13 1981-08-20 Mannesmann AG, 4000 Düsseldorf METHOD FOR AVOIDING BREAKTHROUGH IN CONTINUOUS CASTING PLANTS
EP0044291A1 (en) * 1980-07-11 1982-01-20 VOEST-ALPINE Aktiengesellschaft Means for measuring the frictional force between the mould and the strand at continuous casting
JPS6152973A (en) * 1984-08-24 1986-03-15 Nippon Kokan Kk <Nkk> Method for predicting breakout in continuous casting
JPS6152974A (en) * 1984-08-24 1986-03-15 Nippon Kokan Kk <Nkk> Method for predicting breakout in continuous casting
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US6487504B1 (en) 2002-11-26
CA2303641A1 (en) 2000-10-03
ATE266489T1 (en) 2004-05-15
DE19915269A1 (en) 2000-10-26
DE50006374D1 (en) 2004-06-17
CN1269271A (en) 2000-10-11
MXPA00003247A (en) 2004-10-28
EP1043096B1 (en) 2004-05-12
CN101391289A (en) 2009-03-25
KR100704181B1 (en) 2007-04-06
KR20000071539A (en) 2000-11-25
JP2000317596A (en) 2000-11-21

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