EP1365873B1 - Procede pour determiner les caracteristiques d'un systeme d'oscillation d'une coquille oscillante pour coulee continue - Google Patents

Procede pour determiner les caracteristiques d'un systeme d'oscillation d'une coquille oscillante pour coulee continue Download PDF

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Publication number
EP1365873B1
EP1365873B1 EP02719905A EP02719905A EP1365873B1 EP 1365873 B1 EP1365873 B1 EP 1365873B1 EP 02719905 A EP02719905 A EP 02719905A EP 02719905 A EP02719905 A EP 02719905A EP 1365873 B1 EP1365873 B1 EP 1365873B1
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EP
European Patent Office
Prior art keywords
determined
stroke
oscillation
hysteresis loop
oscillation system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02719905A
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German (de)
English (en)
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EP1365873A1 (fr
Inventor
Peter Müller
Horst Von Wyl
Thomas Fest
Frank Weissbuch
Michael Schwarz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Salzgitter AG
SMS Siemag AG
Original Assignee
Salzgitter AG
SMS Demag AG
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Publication of EP1365873A1 publication Critical patent/EP1365873A1/fr
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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
    • B22D11/166—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
    • 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
    • B22D11/165—Controlling or regulating processes or operations for the supply of casting powder
    • 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
    • B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould

Definitions

  • the invention relates to a method for determining characteristic data of an oscillation system of an oscillating continuous casting mold, which can be moved by means of a stroke drive over a stroke path x, the stroke path x of the oscillating mold and the driving force F A for the mold stroke movement being detected.
  • the melt jet is introduced in a known manner from a Pour ladle over a shadow pipe, a distributor and a dip pipe into the mold.
  • a lubricating film between the mold walls and the one in solidification conceived strand used special casting powder are used for production of a lubricating film between the mold walls and the one in solidification conceived strand used special casting powder.
  • the mold oscillation is therefore an essential part of the continuous casting process of metals. It enables the required lubricating effect of the Lubricant and thus reduces the coefficient of friction or the between of the strand shell and the mold walls, the frictional force and thus sticking the strand shell to the mold walls. insufficient Frictional conditions reduce the quality of the strand product, which is especially noticeable in longitudinal cracks and irregular and deep lifting marks makes.
  • a mathematical calculation based on a vibration system lies, for example, in the method for determining the frictional force according to WO 96/33035 based. It is proposed for the reconstruction of the frictional force the mold lifting movement and the driving force for the mold movement to measure continuously and the measurement results in a special Computing circuit to process the frictional force as an absolute variable to calculate.
  • JP 610 52 972 is used to predict the breakdown of a strand in a mold proposed to increase the amplitude of the oscillation movement measure up. It becomes an inhibiting influence of the frictional force on the mold stroke assumed.
  • EP 0 992 302 A1 also describes a device for continuous control of the basic setting and oscillation parameters Continuous casting.
  • the mold is arranged in a lifting table and is vibrated by four hydraulic cylinders.
  • the on the hydraulic cylinders actually acting oscillation forces are measured, i.e. all force components (including the friction forces) are considered.
  • the invention is based on the object of a method to provide after. Characteristics of the Oscillation system, especially the actual friction force, with high
  • this object is achieved in that a hysteresis curve of the stroke as a function of the driving force - or a hysteresis curve the driving force as a function of the stroke - determined over a stroke cycle and that current characteristic data about this hysteresis curve the oscillation system can be determined.
  • a hysteresis curve can be used here determined over a stroke cycle or the curves over several stroke cycles become. The values of the driving force and the stroke in the sense of respective stroke position are recorded synchronously by measurement.
  • the loss work W R is preferably determined as characteristic data by the area of the hysteresis curve.
  • the actual frictional force F R between the mold walls and the strand shell can be determined from this work of loss W R or the determined area enclosed by the hysteresis curve.
  • the invention takes advantage of the phenomenon that the acceleration-proportional mass or inertial force as well as the path-proportional spring force of the oscillation or oscillation system describe a reversible process and are completely balanced during each individual stroke cycle. This is not the case with friction. It is an irreversible process in which the mechanical energy is irretrievably converted into heat. This loss of energy can be visualized using the hysteresis curve. In this case, the area enclosed by the hysteresis curve in the coordinate system driving force-stroke or stroke-driving force corresponds to the work dissipation W R of the process, which is used as a measure of the friction force F R.
  • the stroke amplitude value y x becomes a stroke amplitude mean value y x averaged, preferably by means of a moving averaging within a stroke amplitude.
  • the determined frictional force values F Ry should be subjected to a smooth smoothing - over several lifting cycles. This eliminates errors due to electrical interference that could distort the minimum and maximum values.
  • the heat loss as the area enclosed by the hysteresis curve or the frictional force can further characteristic data from the individual Curve profile of the hysteresis curve.
  • the individual Curve profile of the hysteresis curve can be determined.
  • information about the state of wear of the oscillation system there is particularly one here comparative method of visualized hysteresis curves, with hysteresis curves one without play and one with play due to wear Differentiate drivetrain significantly. Quantitative differences can be determined using an image recognition method.
  • characteristic data from the - preferably average - gradient or inclination of the hysteresis curve can be determined; in particular hereby obtained information about the mold suspension.
  • the reason for this is that in the middle slope of the hysteresis curve the shift of the parts of superimposed force components from acceleration and spring forces received.
  • one or more articulations can be broken of the oscillation system in a proportional rotation of the hysteresis slope detect.
  • the inclinations can also be compared several successive hysteresis curves for qualitative statements via the oscillation system.
  • the drive force and the stroke or the oscillation position of the stroke drive must be detected, preferably by measurement.
  • This measurement should be carried out at measuring frequencies f mess of 2-100 times the oscillation frequency f. At the longest, a measurement is required after half a stroke cycle of the oscillation to be assessed. In practice, sampling frequencies of 10-100 times the oscillation frequency have proven their worth.
  • an idle measurement is carried out.
  • An idle measurement is therefore carried out to determine the mechanical friction losses to be determined in advance and later from the total value determined subtract to determine an effective value of the frictional force. in this connection is a calculation using single value differences, mean value differences or Difference hysteresis curves possible. It is recommended to take various idle measurements of the oscillation system with different oscillation parameters to be carried out before the start of pouring and / or during a pouring break. The determined values can also be processed statistically.
  • the determined characteristic data and / or the hysteresis curves are visualized and registered, and there are control data to change the current oscillation parameters accordingly, such as Negative strip, healing time, i.e. the time the lubricant is in the gap between Strand shell and mold wall penetrates, stroke amplitude and stroke frequency as well as the vibration norm, as well as for changing the current casting parameters, such as cooling parameters and casting powder, to achieve target conditions determined.
  • control data to change the current oscillation parameters accordingly such as Negative strip, healing time, i.e. the time the lubricant is in the gap between Strand shell and mold wall penetrates, stroke amplitude and stroke frequency as well as the vibration norm, as well as for changing the current casting parameters, such as cooling parameters and casting powder, to achieve target conditions determined.
  • a corresponding continuous caster comprises a computer unit for determining a hysteresis curve from the stroke as a function of the driving force over a stroke cycle as well as to determine current characteristic data via the oscillation system based on this hysteresis curve.
  • this continuous casting direction further comprises signal lines which connect devices for measuring the driving force F A and the stroke x with the computer unit, the computer unit calculating corresponding control signals from the determined characteristic data, and command lines between the computer unit and control devices for controlling the Oscillation system and / or the casting parameters depending on the determined characteristic data and calculated control data.
  • the respective driving force is preferably from the measured Chamber pressures of the respective hydraulic cylinders of the drive train are determined.
  • the device for determining the stroke path includes position sensors for measuring the current position of the respective cylinder piston of a cylinder unit of the hydraulic drive unit. There are hysteresis curves each formed for the separate cylinder units or possibly over several cylinder units averaged.
  • the drive forces can determined by strain gauges or load cells on the connecting rods the stroke distances are calculated back from the angles of rotation.
  • the proposed method for resonance molds i.e. in Spring packs of molds stored, used.
  • FIG. 1 schematically gives an overview of a mold 1, here shown with two walls 1a, b, with strand 2 solidifying therein, and an overview of the forces acting on it.
  • the mold 1 is set into an oscillating or oscillating movement (according to the direction of the arrow) and for this purpose a driving force F A is applied.
  • the oscillating movement of the mold causes the friction force F R in this oscillating system between the strand shell and the mold walls 1a, b.
  • FIG. 2 shows an illustration of an oscillation system 3 and a continuous casting device according to the invention.
  • the oscillation system 3 comprises a lifting table 4 which receives the mold 1 in a positive and non-positive manner.
  • This lifting table 4 is freely swingably mounted on hydraulic cylinders - one of these hydraulic cylinders is shown here as a cylinder unit 5 as an example - and is guided by a spring system 6 in a vertical direction of vibration.
  • Each cylinder unit 5 has a working piston 9 which is movably arranged between an upper pressure chamber 7 with a pressure p o and a lower pressure chamber 8 with a pressure p u , the upper and lower working surfaces of which can be acted upon by the working medium of the upper or lower pressure chamber 7, 8.
  • These pressures p o and p u are measured using appropriate measuring devices 10, 11 and corresponding signals are fed via signal lines 12, 13 directly into a central computer unit 14 in order to calculate the resulting driving force F A for the respective cylinder.
  • the stroke x is determined by means of a position meter 15 in synchronism with the pressures p o and p u .
  • the measured values are also fed into the central computer unit 14 via a corresponding signal line 16.
  • This computer unit 14 uses the drive forces F A and the respective stroke position x to determine a hysteresis curve over a stroke cycle, specifically for each hydraulic cylinder.
  • control signals are calculated which are sent via command lines 17 for controlling control devices for the oscillation system 3 or for setting the casting parameters are transmitted to the corresponding control devices.
  • the control device 18 for setting the casting speed v is shown here by way of example. The casting speed should be reduced if there is a risk of breakage, so that the strand shell becomes thicker and more stable again.
  • Knowledge of the frictional force can also be used for process control and process monitoring with regard to an automated pouring of powder or lubricant or with regard to a taper adjustment of the side walls in the case of adjustable molds, by the supply of casting powder when the friction increases and the taper of the side walls in the case of abnormal friction conditions is adjusted.
  • the continuous casting device shown here is only one example for determining the driving force of the oscillating movement of continuous casting molds. Measurements by means of strain gauges, load cells in mechanical drives and the measurement of motor currents in electrical drives are of course also conceivable.
  • FIG. 3 shows the determined hysteresis curves H 1 , H 2 of two lifting cylinders by plotting the respective measured stroke in mm over the respective, synchronously measured, driving force F A.
  • the area enclosed by the respective hysteresis curve corresponds to the loss work W R due to friction losses. From this, the frictional force can be determined based on a stroke value.
  • the mold is moved approximately between + 2.5mm and -2.5mm.
  • the period or one stroke cycle is 0.466 seconds or reciprocally a frequency of 2.146 Hz.
  • the slope of the left hysteresis curve is 3.84 kN / mm, that of the right hysteresis curve 3.27 kN / mm.
  • the hysteresis is 5.70 kN on the left hysteresis curve and 4.94 kN on the right hysteresis curve.
  • Characteristic data in particular for determining the actual frictional force F R, can be determined both from the area enclosed by the hysteresis curves, from the special curve shape and from the slope or inclination of the individual curves.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Claims (14)

  1. Procédé pour déterminer les caractéristiques d'un système d'oscillation d'une lingotière oscillante pour coulée continue, qui est déplaçable au moyen d'une propulsion de levage sur une course de levage x, la course de levage x de la lingotière oscillante (1) et la force de propulsion FA pour le mouvement de levage de la lingotière étant enregistrées,
    caractérisé en ce qu'on détermine une courbe d'hystérésis (H1, H2) de la course de levage en tant que fonction de la force de propulsion sur un cycle de levage et
    qu'au moyen de cette courbe d'hystérésis, on détermine les caractéristiques actuelles par le biais du système d'oscillation.
  2. Procédé selon la revendication 1,
    caractérisé en ce qu'on détermine en tant que caractéristiques le travail de perte WR au moyen de la surface de la courbe d'hystérésis.
  3. Procédé selon la revendication 2,
    caractérisé en ce qu'on détermine, à partir de la surface déterminée de la courbe d'hystérésis, la force de frottement FR entre les parois de la lingotière (1a, b) et la croûte solidifiée.
  4. Procédé selon la revendication 3,
    caractérisé en ce qu'une valeur de force de frottement FRy est déterminée à partir du rapport entre le travail de perte WR et la valeur d'amplitude de levage yx.
  5. Procédé selon la revendication 4,
    caractérisé en ce que
    la valeur d'amplitude de levage yx par rapport à une valeur moyenne d'amplitude yx de levage et la valeur de force de frottement FRy par rapport à une valeur moyenne de force de frottement FRy sont ramenées à une moyenne.
  6. Procédé selon l'une quelconque des revendications 1 à 5,
    caractérisé en ce que
    les caractéristiques sont déterminées à partir de l'évolution de courbe individuelle de la courbe d'hystérésis.
  7. Procédé selon la revendication 6,
    caractérisé en ce qu'on obtient, à l'aide des caractéristiques déterminées à partir de l'évolution de courbe individuelle de la courbe d'hystérésis, des informations sur l'état d'usure du système d'oscillation (3).
  8. Procédé selon l'une quelconque des revendications 1 à 7,
    caractérisé en ce que
    les caractéristiques sont déterminées à partir de la pente de la courbe d'hystérésis.
  9. Procédé selon la revendication 8,
    caractérisé en ce qu'on obtient, à l'aide des caractéristiques déterminées à partir de la pente de la courbe d'hystérésis, des informations sur la suspension de la lingotière.
  10. Procédé selon l'une quelconque des revendications 6 à 9,
    caractérisé en ce qu'on réalise une comparaison des évolutions de courbes individuelles et/ou de la pente de plusieurs courbes d'hystérésis.
  11. Procédé selon l'une quelconque des revendications 1 à 10,
    caractérisé en ce qu'on effectue une mesure de la force de propulsion FA ainsi que de la course de levage x avec des fréquences de mesure fmes de 2 à 100 fois, de préférence 10 à 100 fois, la fréquence d'oscillation.
  12. Procédé selon l'une quelconque des revendications 1 à 11,
    caractérisé en ce que,
    pour définir les pertes en course à vide du système d'oscillation (3), on réalise une mesure en course à vide.
  13. Procédé selon la revendication 12,
    caractérisé en ce qu'on réalise différentes mesures en course à vide du système d'oscillation (3) pendant une pause de coulée avec différents paramètres d'oscillation.
  14. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce qu'on visualise et qu'on enregistre les caractéristiques déterminées et/ou les courbes d'hystérésis et qu'on détermine les données de commande pour la modification correspondante des paramètres d'oscillation actuels et des paramètres de coulée actuels afin d'atteindre les conditions théoriques.
EP02719905A 2001-03-02 2002-02-23 Procede pour determiner les caracteristiques d'un systeme d'oscillation d'une coquille oscillante pour coulee continue Expired - Lifetime EP1365873B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10110081 2001-03-02
DE10110081A DE10110081A1 (de) 2001-03-02 2001-03-02 Verfahren zum Ermitteln von Kenndaten eines Oszillationssystems einer oszillierenden Stranggießkokille
PCT/EP2002/001926 WO2002070172A1 (fr) 2001-03-02 2002-02-23 Procede pour determiner les caracteristiques d'un systeme d'oscillation d'une coquille oscillante pour coulee continue

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Publication Number Publication Date
EP1365873A1 EP1365873A1 (fr) 2003-12-03
EP1365873B1 true EP1365873B1 (fr) 2004-07-14

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EP02719905A Expired - Lifetime EP1365873B1 (fr) 2001-03-02 2002-02-23 Procede pour determiner les caracteristiques d'un systeme d'oscillation d'une coquille oscillante pour coulee continue

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EP (1) EP1365873B1 (fr)
DE (2) DE10110081A1 (fr)
WO (1) WO2002070172A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10219287A1 (de) * 2002-04-30 2003-11-13 Sms Demag Ag Verfahren und Einrichtung zum Erkennen des Maschinenzustandes von Elementen oder Baugruppen einer Oszillationsvorrichtung in Stranggießanlagen für flüssige Metalle, insbesondere für flüssigen Stahl
DE102008006189A1 (de) * 2008-01-26 2009-07-30 Sms Demag Ag Einrichtung und Verfahren zum Regeln von Kokillenoszillationen
CN109954855B (zh) * 2017-12-26 2024-04-26 有研工程技术研究院有限公司 真空电子束炉用自动铸锭控制系统及其控制方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3893502A (en) * 1974-05-31 1975-07-08 United States Steel Corp Method and mechanism for indicating mold friction in a continuous-casting machine
US4615375A (en) * 1983-04-18 1986-10-07 United States Steel Corporation Continuous casting mold friction monitor
US4532975A (en) * 1983-04-28 1985-08-06 United States Steel Corporation Continuous casting mold oscillator load indication system
DE19515316C1 (de) * 1995-04-19 1996-08-29 Mannesmann Ag Verfahren zum Betreiben einer Kokille
DE19845357A1 (de) * 1998-10-02 2000-04-06 Schloemann Siemag Ag Verfahren und Vorrichtung zur kontinuierlichen Kontrolle der Grundeinstellung und Oszillationsparameter einer Stranggießkokille

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Publication number Publication date
WO2002070172A1 (fr) 2002-09-12
EP1365873A1 (fr) 2003-12-03
DE50200631D1 (de) 2004-08-19
DE10110081A1 (de) 2002-09-05

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