WO2005042186A1 - Dispositif et procede d'agitation ou de freinage electromagnetique de coulee de metaux, en particulier de coulee continue d'acier - Google Patents

Dispositif et procede d'agitation ou de freinage electromagnetique de coulee de metaux, en particulier de coulee continue d'acier Download PDF

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Publication number
WO2005042186A1
WO2005042186A1 PCT/EP2004/012143 EP2004012143W WO2005042186A1 WO 2005042186 A1 WO2005042186 A1 WO 2005042186A1 EP 2004012143 W EP2004012143 W EP 2004012143W WO 2005042186 A1 WO2005042186 A1 WO 2005042186A1
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WO
WIPO (PCT)
Prior art keywords
stirring
frequency
current
converter
changed
Prior art date
Application number
PCT/EP2004/012143
Other languages
German (de)
English (en)
Inventor
Werner Czerny
Klaus Pronold
Hans-Herbert Welker
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2005042186A1 publication Critical patent/WO2005042186A1/fr

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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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/122—Accessories for subsequent treating or working cast stock in situ using magnetic fields
    • 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

  • stirring coils are often used, with which electromagnetic stirring of cast metal or continuous steel casting is made possible.
  • the internal properties, the surface and the area near the edge of the cast metal, in particular the steel, are to be improved.
  • Stirring devices are used for molds, but also in the strand area. Electromagnetic stirring can be used not only with steel, but also when casting other metals or metal alloys such as Copper, brass or bronze can be carried out.
  • stirring coils can also be used to dampen and brake the existing movements and vibrations of the liquid metal.
  • Electromagnetic stirring coils are known which either comprise the partially solidified strand as a rotating stirring coil or are arranged as a linear stirring coil on one side of the strand.
  • the working principle of the stirring coils corresponds to that of an electric induction motor, the stirring coil corresponding to the stator or stator of the motor and the liquid metal in the strand to the armature or rotor.
  • the stirring coils are fed by inverters. With the help of the converter, when stirring in the mold, a strong stirring movement in the area of the bathroom mirror realized. The required rotational movement is generated by the electromagnetic forces induced by the stirring coil. Conversely, the induced forces can also be used to brake existing movements in the metal bath.
  • the invention is therefore based on the problem of specifying a device for the electromagnetic stirring of cast metal, in particular continuous steel casting, which does not have a disadvantageous effect on the liquid core of the partially solidified strand.
  • the frequency of the current generated by the converter and the current flowing through the at least one stirring coil is adjustable.
  • the device according to the invention provides an adjustment option for the current frequency generated by the converter. Accordingly, the frequency can be set so that it does not adversely affect the liquid core and flow turbulence can be avoided. Since there is no undesired turbulence, tearing of the covering powder layer in the pouring area of the dip tube is also avoided.
  • the current intensity is additionally adjustable. This creates another possibility for making the necessary settings so that no disturbances in the liquid metal or steel occur, or these are minimized to such an extent that they are tolerable.
  • the frequency and / or the starome strength can or can be changed in a pulsating manner in order to generate a non-constant stirring or braking device.
  • this creates an additional movement in the mold or in the partially solidified strand, in that the current intensity is preferably changed in a pulsating manner.
  • the degree of change in the chromium thickness can be selected depending on the inertia of the cast material.
  • the frequency can be adjusted smoothly in the device according to the invention.
  • the jerk-free adjustment leads to a stepless adjustment of the frequency or the current, so that the change in the induction forces acting on the liquid metal does not occur suddenly, but gradually, whereby flow turbulence is avoided.
  • the frequency possibly also the current strength
  • the frequency can be changed via a ramp function. It is particularly preferred that the individual sections of the ramp function merge smoothly and smoothly into one another. Instead of a "digital" transition from a first frequency or current value to a second, different value, there is a gradual transition via a ramp.
  • a further improvement is achieved by stepless transitions of the individual sections of the ramp function, so that the transition from the first to the second setting value occurs continuously.
  • the advantage of the device according to the invention is particularly evident when one or more stirring coils are switched on or off via the converter or converters, since the setting values for the frequency or the current can be started up smoothly and gently without undesired flow effects.
  • the converter is designed to generate a non-sinusoidal voltage and / or a non-sinusoidal current waveform.
  • these can be sawtooth-shaped, for example, which leads to advantageous effects when stirring.
  • At least one first stirring coil is arranged in the area of the mold and at least one second stirring coil is arranged in the area of the partially solidified strand. It is expedient to provide two converters in such an arrangement.
  • the frequency if appropriate also the current strength, can be changed as a function of at least one process parameter.
  • the pulling speed of the strand can be selected as the process parameter so that the current strength or the frequency can be changed depending on the pull-out speed. In this way, for example, the stirring speed can be reduced if the strand moves more slowly.
  • each converter is connected to a control device on which operating parameters can be entered and / or changed. Provision can also be made to store and / or call up the operating parameters of the converter as a sequence program in the control device.
  • the invention also relates to a method for electromagnetic stirring or braking of cast metal, in particular continuous steel casting, with at least one stirring coil connected to a converter for generating induction forces acting on the liquid core of the partially solidified strand.
  • the frequency of the current generated by the converter and flowing through the at least one stirring coil is adjusted.
  • the device and method according to the invention can also be used to brake movements in the liquid core of the partially solidified strand.
  • the existing movements of the melt can be dampened and broken down into smaller movements or vibrations in order to calm the metal bath.
  • Non-sinusoidal forces are particularly suitable for this.
  • FIG. 1 shows a device according to the invention for electro-magnetic stirring or braking of cast metal with several stirring coils in a partially sectioned view
  • Fig. 3 shows the change in frequency with a stepless ramp function.
  • Fig. 1 shows a device for electromagnetic stirring or braking of cast metal with several stirring coils in a partially sectioned view.
  • the liquid steel passes through a dip tube 1 into the mold 2, which consists of copper in this area.
  • Cover powder 4 is sprinkled on the liquid steel bath 3, which acts, among other things, as a release agent and prevents the steel from adhering to the mold 2.
  • a second set of stirring coils 7 is arranged below the first stirring coils 6 for the mold in the region of the partially solidified steel strand 5. As shown in FIG. 1, the exemplary embodiment shown is two stirring coils arranged on the side of the steel strand 5, alternatively However, it is also possible to use only a single stirring coil at this point.
  • the stirring coils 7 are connected to a converter 9 which can be controlled via the central control device 10.
  • At least one stirring coil is required, which is designed either as a rotating stirring coil or as a linear stirring coil.
  • An electric rotating field is generated by a rotary stirring coil, whereas a magnetic traveling field is generated by a linear coil, through which the rotating or linear forces are inductively transmitted to the liquid core of the steel strand 5.
  • the size and direction of the generated inductive electromagnetic forces is influenced by the current that flows through the stirring coils 6, 7. This current is supplied by the converters 8, 9, which are controlled by the control device 10.
  • the stirring has a positive effect on the internal structure of the steel. If a steel strand solidifies without stirring, the impurities that are always present tend to move in the middle of the steel strand in front of the solidification front, which means that profiles rolled out of the steel strand have a weak point in the middle. This effect can even break the rolled steel profiles.
  • the inductively generated stirring movement results in a more uniform distribution and a homogeneous structure, so that the steel cast and solidified in this way has improved properties. Furthermore, an improvement in the surface can be achieved.
  • stirring can be carried out with constant current.
  • the current intensity is adjusted while stirring, so that it e.g. pulsates, which results in pulsating induction forces.
  • a non-sinusoidal current intensity curve is generated, which can in particular be sawtooth-shaped.
  • the frequency can also be changed in a pulsating manner.
  • an existing movement of the liquid metal within the mold or the steel strand can be dampened in a controlled manner. This makes it particularly easy to eliminate vibrations in steel strands that can cause standing waves to form, which are reflected on the side surfaces. These movements are braked and damped by breaking them down into smaller vibrations or shaking movements, which are generated by the non-sinusoidal current curve.
  • FIG. 2 shows a diagram of the change in frequency over time by means of a ramp function. The time is entered on the abscissa, the frequency on the ordinate.
  • the frequency does not change suddenly from an initial value 11 to an end value 12, but via a ramp 13, as a result of which smooth, stepless adjustment is achieved. Accordingly, the inductive electromagnetic generated by the stirring coils 6, 7 is also changed Fields jerk-free, so that the undesirable turbulence in the flow of the steel bath 3 and in the not yet solidified inner area of the steel strand 5 can be advantageously avoided.
  • FIG. 3 is a diagram similar to FIG. 2 and shows the change in frequency over time by means of a stepless ramp function.
  • the transition from the initial value 11 to the ramp 13 takes place via a continuously increasing transition area 15, so that the frequency is not adjusted abruptly, but smoothly and continuously. In this way, the influences of the change in the induction forces are further reduced and the problem of poor structural properties is largely avoided.
  • the current strength can also be controlled using the ramp functions shown in FIGS. 2 and 3. It is also possible to adjust and change frequency and current at the same time.
  • standard converters can be used in the device according to the invention, which are parameterized accordingly.
  • the changes are made during operation by setting the frequency and current separately.
  • the parameters for the operation can be stored in the control device 10, modified and called up again, so that for different applications, for example different steel compositions, because individual parameter sets can be saved in the form of driving programs.
  • only a re-parameterization is required, but not an exchange of the complete firmware or the automation control. Since it is possible to use standard devices, there are cost advantages compared to the previously customary special solutions for the converters.

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

Abstract

L'invention concerne un dispositif d'agitation ou de freinage de coulée de métaux, en particulier de coulée continue d'acier, comprenant au moins une bobine d'agitation (6, 7) connectée à un convertisseur (8, 9), pour la production de forces d'induction agissant sur le noyau liquide de la barre (5) partiellement solidifiée, dispositif caractérisé en ce que la fréquence du courant produit par le convertisseur (8, 9) et circulant à travers au moins la bobine d'agitation (6, 7) est réglable.
PCT/EP2004/012143 2003-10-27 2004-10-27 Dispositif et procede d'agitation ou de freinage electromagnetique de coulee de metaux, en particulier de coulee continue d'acier WO2005042186A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2003150076 DE10350076A1 (de) 2003-10-27 2003-10-27 Vorrichtung und Verfahren zum elektromagnetischen Rühren oder Bremsen von Metallguss, insbesondere Stahlstrangguss
DE10350076.6 2003-10-27

Publications (1)

Publication Number Publication Date
WO2005042186A1 true WO2005042186A1 (fr) 2005-05-12

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PCT/EP2004/012143 WO2005042186A1 (fr) 2003-10-27 2004-10-27 Dispositif et procede d'agitation ou de freinage electromagnetique de coulee de metaux, en particulier de coulee continue d'acier

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DE (1) DE10350076A1 (fr)
WO (1) WO2005042186A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106536087A (zh) * 2014-04-25 2017-03-22 蒂森克虏伯钢铁欧洲股份公司 用于薄扁坯连铸的方法和设备
TWI693978B (zh) * 2018-02-26 2020-05-21 日商新日鐵住金股份有限公司 鑄模設備
TWI699247B (zh) * 2018-03-08 2020-07-21 日商日本製鐵股份有限公司 連續鑄造方法、平板鑄片、及連續鑄造機

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006032640B4 (de) * 2006-07-13 2010-07-01 Ema Indutec Gmbh Umrichter, insbesondere zur Erzeugung von Wirkleistung für die induktive Erwärmung und Verfahren zum induktiven Schmelzen und Rühren

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58100953A (ja) * 1981-12-08 1983-06-15 Toshiba Corp 電磁「かく」伴制御装置
JPS61206550A (ja) * 1985-03-12 1986-09-12 Nippon Steel Corp 鋼の連続鋳造法
JPH105945A (ja) * 1996-06-27 1998-01-13 Nkk Corp 連続鋳造鋳型内の溶鋼流動制御方法
WO1999044770A1 (fr) * 1998-03-02 1999-09-10 Abb Ab Procede de coulage en continu et dispositif de mise en oeuvre du procede
WO2003041893A1 (fr) * 2001-09-27 2003-05-22 Abb Ab Dispositif et procede de coulee en continu

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU680154B2 (en) * 1994-08-23 1997-07-17 Nippon Steel & Sumitomo Metal Corporation Method of continuously casting molten metal and apparatus therefor
IT1295164B1 (it) * 1997-07-10 1999-04-30 Danieli Off Mecc Procedimento di agitazione elettromagnetica per cristallizzatore e relativo cristallizzatore

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58100953A (ja) * 1981-12-08 1983-06-15 Toshiba Corp 電磁「かく」伴制御装置
JPS61206550A (ja) * 1985-03-12 1986-09-12 Nippon Steel Corp 鋼の連続鋳造法
JPH105945A (ja) * 1996-06-27 1998-01-13 Nkk Corp 連続鋳造鋳型内の溶鋼流動制御方法
WO1999044770A1 (fr) * 1998-03-02 1999-09-10 Abb Ab Procede de coulage en continu et dispositif de mise en oeuvre du procede
WO2003041893A1 (fr) * 2001-09-27 2003-05-22 Abb Ab Dispositif et procede de coulee en continu

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 007, no. 203 (M - 241) 8 September 1983 (1983-09-08) *
PATENT ABSTRACTS OF JAPAN vol. 011, no. 039 (M - 559) 5 February 1987 (1987-02-05) *
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 05 30 April 1998 (1998-04-30) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106536087A (zh) * 2014-04-25 2017-03-22 蒂森克虏伯钢铁欧洲股份公司 用于薄扁坯连铸的方法和设备
CN106536087B (zh) * 2014-04-25 2020-07-24 蒂森克虏伯钢铁欧洲股份公司 用于薄扁坯连铸的方法和设备
TWI693978B (zh) * 2018-02-26 2020-05-21 日商新日鐵住金股份有限公司 鑄模設備
TWI699247B (zh) * 2018-03-08 2020-07-21 日商日本製鐵股份有限公司 連續鑄造方法、平板鑄片、及連續鑄造機

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