EP1192019B1 - Verfahren und vorrichtung zur messung und reguliering der fliessgeschwindigkeit eines flüssigen metalls in einer stranggiesskokille - Google Patents

Verfahren und vorrichtung zur messung und reguliering der fliessgeschwindigkeit eines flüssigen metalls in einer stranggiesskokille Download PDF

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Publication number
EP1192019B1
EP1192019B1 EP00936984A EP00936984A EP1192019B1 EP 1192019 B1 EP1192019 B1 EP 1192019B1 EP 00936984 A EP00936984 A EP 00936984A EP 00936984 A EP00936984 A EP 00936984A EP 1192019 B1 EP1192019 B1 EP 1192019B1
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EP
European Patent Office
Prior art keywords
current
inductor
voltage
speed
electromagnetic brake
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
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EP00936984A
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English (en)
French (fr)
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EP1192019A1 (de
Inventor
Marcel Garnier
Roland Ernst
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Centre National de la Recherche Scientifique CNRS
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Centre National de la Recherche Scientifique CNRS
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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
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/114—Treating the molten metal by using agitating or vibrating means
    • B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields

Definitions

  • the present invention relates to the field of installations metallurgical and, more particularly, installations continuous casting of a liquid metal in an ingot mold.
  • Figure 1 shows, very schematically and partially by a perspective view, the entrance section a mold 1 for metallurgical continuous casting.
  • the ingot mold essentially includes a mold 2, open to both ends in the case of continuous casting.
  • Liquid metal is brought into the mold by a submerged nozzle 3, plunging in the mold 2.
  • the nozzle 3 has lateral openings 4 which have aim to give a horizontal component at the speed of liquid metal at the outlet of the nozzle 3.
  • Figure 2 is a schematic sectional view of a conventional mold 1 illustrating, by arrows, the movements of the molten metal in the inlet section of the mold 2.
  • the horizontal component given by the vents 4 of the nozzle 3 at the speed of the liquid metal, has the effect of limiting the vertical depth of penetration of the metal supply jet into the mold 2.
  • the liquid metal 1 comes, for example, from a crucible 5 (for example, of the blast furnace type).
  • the crucible 5 comprises, in its lower part, an orifice 6 associated with a controllable closure means 7 for controlling the pouring of the liquid metal into the nozzle 3.
  • the speed of the liquid metal leaving the nozzle 3 can reach several meters per second.
  • a first type of electromagnetic brake uses a continuous magnetic field in a direction perpendicular to the metal flow speed, which gives rise to induced currents. These induced currents interact with the applied magnetic field and generate an electromagnetic force which is a braking force aimed at canceling the speed at the origin of induced currents.
  • Such magnetic field systems continuous are usually made up of an electromagnet completely or partially surrounding the ingot mold, and which produces a magnetic field transverse to the liquid metal.
  • Such systems have the disadvantage of being passive, i.e. the magnetic field is of geometry and position fixed once for all, which means that any deviation from an operating point given reduces the braking efficiency. Therefore, this braking is ineffective when the supply conditions (speed, nozzle shape, depth of immersion of nozzle openings, etc.) change.
  • a second category of electromagnetic brakes so-called sliding field uses an alternating magnetic field produced by a polyphase supply applied to inductors with an adapted spatial distribution.
  • the magnetic field is thus driven by a rotational or translational movement depending on whether the shape of the inductor is cylindrical or planar.
  • Of such magnetic fields make it possible to accelerate or brake liquid metal flows in metallurgical continuous casting.
  • the system is active here since the mechanical effect induced in the liquid metal is independent of the liquid velocity and is is therefore controlled by the operator.
  • the present invention relates, more particularly, continuous casting installations equipped with a electromagnetic brake with sliding magnetic field.
  • a sliding magnetic field brake In practice, in industrial installations of metallurgical continuous casting, a sliding magnetic field brake consists of four associated sliding field inductors in pairs on each side of the mold 2 of the mold. In the figure 1, two of these inductors have been illustrated schematically and designated by the reference 9. In FIG. 2, these two inductors have been shown in dotted lines. On the same side of the mold, the two inductors are, as illustrated in figure 1, arranged symmetrically with respect to the axis of the nozzle 3 on the one hand and other of it to balance the distribution of the metal.
  • a classic method for adjusting the electromagnetic field sliding in an ingot mold of the type illustrated by figures 1 and 2 consists in modeling the flow in a test structure using, for example, water for set the excitation frequency of the inductors. Such a method is described in particular in the patent application European N ° 0550785 already mentioned.
  • a first solution to know this speed would be to use strain gauges attached to rods immersed in the liquid steel of the ingot mold. By measuring a signal related to the hydrodynamic force exerted by the steel liquid on the stems, we can then detect any asymmetry flow and, therefore, if necessary correct it by modification of the power injected into the inductors 9.
  • rods for example of alumina, poses several problems.
  • a first problem is that these rods constitute a intrusive element in the mold which is likely to introduce pollution in the product obtained, in particular, by erosion of the stems linked to the pouring of liquid metal.
  • the present invention aims to overcome the drawbacks conventional metallurgical continuous casting installations.
  • the invention aims, more particularly, to allow an order individualized inductors of an electromagnetic brake to sliding field of such an installation.
  • the present invention also aims to provide a solution which does not cause any pollution of the liquid metal in casting course.
  • the invention also aims to propose a solution which is particularly economical and requires no maintenance in consumable material.
  • the present invention further aims to provide a solution which is particularly suitable for a servo individualized powers injected into the inductors generating the sliding magnetic field.
  • the present invention provides a method of measuring the flow rate of a metal molten liquid in an ingot mold equipped with an electromagnetic brake sliding field, consisting of measuring the voltage or the current of at least one power source of the electromagnetic brake and extract the flow velocity from this information.
  • speed measurement is used to control the excitation of inductors on a predetermined value.
  • the present invention also provides a method of regulation of a continuous casting speed of a molten metal in an ingot mold, consisting supplying the electromagnetic brake with current, respectively with voltage, by at least one constant power source; to control the voltage respectively the current from said power source on a measure of the voltage respectively of the current in each inductor.
  • the present invention also provides an installation for continuous casting of the type using an electromagnetic brake sliding field to organize the flow of a liquid metal delivered by two vents from a nozzle, characterized in that each electromagnetic brake inductor is powered by a circuit individual; and in that the installation includes means for regulate the current, respectively the supply voltage of each inductor from a measurement of the variations of the current, respectively of the supply voltage of the inductors in order to maintain the flow rates of the liquid metal balanced between the two gills.
  • each supply circuit of each inductor includes its own means of regulating the excitation power electromagnetic of this inductor.
  • the installation includes a circuit control center supply of the different inductors to regulate the speed liquid metal flow.
  • a feature of the present invention is take advantage of an individual diet of different electromagnetic sliding field brake inductors for extract electrical characteristics from this power supply inductors, information relating to the flow velocity liquid metal in the mold.
  • the fact that the currents induced by the conductive liquid metal in the field magnetic field created by inductors depend, among other things, on the liquid metal flow speed.
  • any disturbance that causes a variation of this speed results in a variation of the impedance of the inductors sensitive to the corresponding induced current.
  • the inductors a constant power source either with current or in tension, and we examine the possible variation of the other quantity (voltage or current) to deduce a variation of the liquid metal flow speed.
  • this speed can be located from the moment the inductors are powered separately from each other.
  • This information can, in a preferred embodiment, be used in feedback a control system for feeding the different inductors to control the flow speed of the metal on an equilibrium point corresponding to a set point of given speed, for example, calculated from modeling as described in European patent application No. 0550785.
  • FIG. 3 very schematically illustrates the position of four inductors in a continuous casting installation. For simplification, only the inductors 9 and a parallelogram symbolizing the liquid metal 1 between these inductors have been shown.
  • each inductor 9 is made up of several nested amps / turns capable of being respectively supplied by different phases.
  • Each inductor 9 therefore comprises two circuits, respectively 10 and 11, of conducting ampere-turns nested in a magnetic yoke 12 opposite the metal l with respect to the plane xz in which the conducting circuits 10 and 11 are inscribed.
  • a first conducting circuit 11 corresponding to a first phase consists of three packages of conductors 13, 14, 15.
  • the number of conductors of the central package 15 corresponds to twice the number of conductors of the packages 13 and 14 which surround two packages 16, 17 of conductors of the second circuit 10 intended to be supplied by the second phase of the two-phase supply.
  • the bundles of conductors are directly connected in phase at one of their ends and, via the power source (not shown in FIG. 3), at their other respective ends.
  • the bundles of conductors of the different inductors are in the vertical direction z . They are, for example, connected directly by their respective lower ends.
  • the organization of the current flows as illustrated in FIG. 3 is perfectly conventional and will not be detailed further. It will simply be noted that the invention can be implemented in a system comprising a greater number of phases, for example in a three-phase or polyphase system of greater number while respecting the usual nesting of the phases to obtain a polyphase sliding field system. . It will also be noted that, as illustrated by the representations of the directions of current flow in FIG. 3, the x axis corresponds to an axis of longitudinal symmetry which is in fact an anti-symmetry axis for the inductors 9 which are face two by two.
  • the vector potential A, the current density j , and the electric field E have a single component along the vertical axis z
  • the speed of the induced metal v has a single component along the longitudinal axis x
  • the magnetic induction B has two components along the horizontal axes x and y .
  • the speed of synchronism v s of the sliding electromagnetic field is equal to the product of the operating frequency f of the alternating excitation of the two phases by the wavelength ⁇ of the sliding field wave. It will be noted that the real speed v of the metal is opposite to this synchronism speed which also includes only one component along the longitudinal axis x .
  • the density current is 6.75.10 6 effective amps per m 2 .
  • the wavelength ⁇ of the sliding field is then about 1.3 m.
  • the synchronism speed v s is then 84.5 cm / s.
  • ⁇ 100.10 -8 ⁇ m
  • the respective values of the total voltage for the bundles of conductors For example, for bundles 16 and 17 of 40 conductors of square section of 20x20 mm 2 in series, which amounts to considering bundles of 40 turns in each of which passes an effective current of 2700 A, we obtain voltages of 38, 66 volts and 36.74 volts in module for, respectively, 10 cm / s and 9 cm / s. Consequently, the voltage of the corresponding phase decreases in modulus by approximately 2/38, or approximately 5%. On the impedance of the corresponding phrase, the variation is also of the order of 5% for the same variation in speed of the metal.
  • FIG. 4 illustrates, by a top view of an ingot mold, the respective electrical connections according to the invention two-phase inductors illustrated in Figure 3.
  • the direct connections between different packets of conductors, for example, in the lower part of the system, have been symbolized by dotted lines.
  • the nozzle 3 has been shown schematically in Figure 4 in the center of the mold 2.
  • Each inductor 9 has been symbolized by its magnetic yoke 12 and its two conducting circuits 10, 11 formed, in the direction vertical, respectively of two packages 16, 17 of the same number of conductors and three packages 13, 14, 15, the central package 15 with double the number of conductors end 13 and 14.
  • each circuit 10 is connected directly, for example, by a cable 18 in the lower part.
  • packets 13 and 14 are each connected to the package 15, for example, by cables, 19 and 20 respectively.
  • the conducting circuits 10 and 11 of each inductor 9 are connected individually to a supply circuit 21 specific to the inductor concerned. So, packages 13 and 14, package 15, package 16 and the package 17 are connected to a circuit 21 by respective cables 22, 23, 24 and 25.
  • all the circuits 21 have a structure identical which will be described later in relation to the figure 5.
  • Each circuit is individually connected to a central 26, for example, by cables 27.
  • the cables 27 have been illustrated as comprising several independent conductors to bring, to each supply circuit 21, the different phases of alternative power required as well that, where appropriate, appropriate control signals provided via the control unit 26. Note, however, that only the signals of command could be individualized and that drivers polyphase power supply could be common to different circuits 21, these then being responsible for adapting the powers to provide to each of the inductors.
  • FIG. 5 very schematically represents the constitution of a supply circuit 21 of an inductor according to the present invention.
  • circuit 21 of FIG. 5 comprises two current sources 31 and 32 supplying, for example, cables 23 and 25 respectively associated with bundles of conductors 15 and 16 as illustrated in relationship with FIG. 4.
  • the current sources 31 and 32 are, according to the invention, controllable, respectively, by signals 33 and 34 delivered by regulation circuits, respectively 35 and 36.
  • Each circuit 35, 36 measures the voltage between, respectively, conductors 22 and 23 and conductors 24 and 25. These voltage measurements are intended to assess the speed of the liquid metal next to the corresponding inductor.
  • each regulator 35, 36 receives a setpoint 37, 38 from the central 26 ( Figure 4) and is responsible for controlling the current delivered by sources 31 and 32 to allow a speed regular and balanced in the mold.
  • control unit 26 we can also provide for regulation to be carried out directly by control unit 26, or that a voltage measurement is used to calculate the speed so that it can be used by the central 26.
  • the inductors are supplied with a voltage of predetermined value controllable and use a current measurement whose variations will then be a function of speed, thus allowing to react on the supply voltage source.
  • An advantage of the present invention is that it allows a measurement of the speed of the liquid metal in the ingot mold without physical contact with liquid metal.
  • Another advantage of the present invention is that it lends itself particularly well to the control of systems continuous casting since it is very easy to react on the current or the voltage in the inductors.
  • Another advantage of the present invention is that it does not require any modification of conventional installations of electromagnetic sliding field continuous casting, with the exception of the control circuits of the various inductors.
  • the present invention is capable of various variants and modifications which will appear to the man of art.
  • the adaptation of the process according to the number of phases of electromagnetic field brake systems sliding is within the reach of those skilled in the art depending on the application and functional indications given above.
  • the numerical values indicated in the description above were only to show the feasibility industrial invention and have only illustrative value.
  • the present invention can be implementation in any continuous casting system whatever either the shape of the ingot mold, provided that it uses an active electromagnetic sliding field brake system.

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

Claims (7)

  1. Verfahren zum Messen der Strömungsgeschwindigkeit eines flüssigen geschmolzenen Metalls (1) in einer Kokille (1), die mit einer elektromagnetischen Gleitfeldbremse ausgestattet ist,
    gekennzeichnet durch: Versorgen der elektromagnetischen Bremse mit Strom bzw. Spannung durch zumindest eine konstante Energiequelle; Messen der Spannung bzw. des Stroms der Energiequelle (31, 32) und Ableiten der Strömungsgeschwindigkeit aus den Veränderungen dieser Messung.
  2. Verfahren nach Anspruch 1, das an einer elektromagnetischen Bremse angewandt wird, wobei zumindest ein Induktor (9) zwei Bündel (16, 17) aus mehreren Leitern in einer vertikalen Richtung (z) umfaßt, dadurch gekennzeichnet, daß das Verfahren für jeden Leiter.die folgende Beziehung anwendet: gradV=-i(ω-vk)A-ρj, wobei ω den Wechselstrom-Erregungsimpuls des Gleitfeldes, v die Metallgeschwindigkeit, k die Wellenzahl des induktiven magnetischen Gleitfeldes, A das Vektorpotential, ρ den spezifischen Widerstand des Metalls, j die Stromdichte des Erregungsstroms des Leiters, V die an dem Induktor anliegende Spannung und i den imaginären Teil einer komplexen Zahl bedeuten.
  3. Verfahren nach den Ansprüchen 1 oder 2, dadurch gekennzeichnet, daß das Messen der Geschwindigkeit dazu benutzt wird, die Erregung der Induktoren (9) auf einen vorbestimmten Wert mit Hilfskraft zu regeln.
  4. Verfahren zum Regulieren der kontinuierlichen Gießgeschwindigkeit eines geschmolzenen Metalls in einer Kokille (1), die mit einer elektromagnetischen Gleitfeldbremse ausgestattet ist, welche mehrere Leiter (9) umfaßt, gekennzeichnet durch: Versorgen der elektromagnetischen Bremse mit Strom bzw. Spannung durch zumindest eine konstante Energiequelle, Regeln der Spannung bzw. des Stroms der Energiequelle (31, 32) mit Hilfe der Messung von Spannung bzw. Strom in jedem Induktor.
  5. Anordnung zum kontinuierlichen Gießen mit einer elektromagnetischen Gleitfeldbremse zur Steuerung der Strömung eines flüssigen Metalls 1, welches durch zwei Öffnungen (4) einer Düse (3) ausströmt, dadurch gekennzeichnet, daß jeder Induktor (9) der elektromagnetischen Bremse durch eine eigene Schaltung (21) versorgt wird und daß die Anordnung Mittel (26, 35, 36) zum Regeln des Versorgungsstroms bzw. der Versorgungsspannung jedes Induktors ausgehend von einer Messung der Veränderungen des Stroms bzw. der Spannung der Versorgung der Induktoren umfaßt, um die Strömungsgeschwindigkeiten des flüssigen Metalls durch die beiden Öffnungen ausgeglichen zu halten.
  6. Anordnung nach Anspruch 5, dadurch gekennzeichnet, daß jede Versorgungsschaltung (21) jedes Induktors (9) eigene Mittel (35, 36) zum Regeln der elektromagnetischen Erregungsleistung dieses Induktors umfaßt.
  7. Anordnung nach Anspruch 5, dadurch gekennzeichnet, daß sie eine Zentraleinheit zum Regeln der Versorgungsschaltung (21) der verschiedenen Induktoren (9), um die Strömungsgeschwindigkeit des flüssigen Metalls zu regulieren.
EP00936984A 1999-05-31 2000-05-30 Verfahren und vorrichtung zur messung und reguliering der fliessgeschwindigkeit eines flüssigen metalls in einer stranggiesskokille Expired - Lifetime EP1192019B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9907021 1999-05-31
FR9907021A FR2794042B1 (fr) 1999-05-31 1999-05-31 Mesure de vitesse d'une coulee metallurgique
PCT/FR2000/001485 WO2000072996A1 (fr) 1999-05-31 2000-05-30 Procede et installation de mesure et de regulation de la vitesse d'ecoulement d'un metal liquide dans une lingotiere de coulee continue

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Publication Number Publication Date
EP1192019A1 EP1192019A1 (de) 2002-04-03
EP1192019B1 true EP1192019B1 (de) 2003-07-30

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EP00936984A Expired - Lifetime EP1192019B1 (de) 1999-05-31 2000-05-30 Verfahren und vorrichtung zur messung und reguliering der fliessgeschwindigkeit eines flüssigen metalls in einer stranggiesskokille

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EP (1) EP1192019B1 (de)
JP (1) JP2003500218A (de)
AT (1) ATE246061T1 (de)
CA (1) CA2375661C (de)
DE (1) DE60004232T2 (de)
FR (1) FR2794042B1 (de)
WO (1) WO2000072996A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008055034A1 (de) 2008-12-19 2010-07-01 Forschungszentrum Dresden - Rossendorf E.V. Verfahren und Anordnung zur kontaktlosen Bestimmung von Geschwindigkeitsverteilungen eines flüssigen Metalls in einer Stranggießkokille
DE102019105628B3 (de) * 2019-03-06 2020-03-19 Helmholtz-Zentrum Dresden - Rossendorf E.V. Anordnung zur berührungslosen Bestimmung der Geschwindigkeitsverteilung eines Schmelzvolumens in einer Stranggusskokille

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3415251A1 (de) * 2017-06-16 2018-12-19 ABB Schweiz AG Elektromechanisches bremssystem und verfahren zur steuerung eines elektromechanischen bremssystems
BR112020019226B1 (pt) * 2018-07-17 2024-01-23 Nippon Steel Corporation Equipamento de molde e método de lingotamento contínuo
KR102310701B1 (ko) * 2019-12-27 2021-10-08 주식회사 포스코 주조 설비 및 주조 방법

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE459401B (sv) * 1986-10-20 1989-07-03 Asea Ab Saett och anordning foer bromsning och/eller omroerning av de icke stelnade partierna av en gjutstraeng
JP2898355B2 (ja) * 1989-06-09 1999-05-31 新日本製鐵株式会社 鋳型内溶鋼流動制御方法
CA2059030C (en) * 1992-01-08 1998-11-17 Jun Kubota Method for continuous casting of slab

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008055034A1 (de) 2008-12-19 2010-07-01 Forschungszentrum Dresden - Rossendorf E.V. Verfahren und Anordnung zur kontaktlosen Bestimmung von Geschwindigkeitsverteilungen eines flüssigen Metalls in einer Stranggießkokille
DE102019105628B3 (de) * 2019-03-06 2020-03-19 Helmholtz-Zentrum Dresden - Rossendorf E.V. Anordnung zur berührungslosen Bestimmung der Geschwindigkeitsverteilung eines Schmelzvolumens in einer Stranggusskokille
WO2020178319A1 (de) 2019-03-06 2020-09-10 Helmholtz-Zentrum Dresden - Rossendorf E. V. Anordnung zur berührungslosen bestimmung der geschwindigkeitsverteilung eines schmelzvolumens in einer stranggusskokille

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FR2794042B1 (fr) 2001-08-24
DE60004232T2 (de) 2004-04-22
ATE246061T1 (de) 2003-08-15
CA2375661C (en) 2008-10-07
FR2794042A1 (fr) 2000-12-01
WO2000072996A1 (fr) 2000-12-07
JP2003500218A (ja) 2003-01-07
DE60004232D1 (de) 2003-09-04
EP1192019A1 (de) 2002-04-03
CA2375661A1 (en) 2000-12-07

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