EP0028761B1 - Procédé de brassage lors de la coulée continue - Google Patents

Procédé de brassage lors de la coulée continue Download PDF

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Publication number
EP0028761B1
EP0028761B1 EP80106596A EP80106596A EP0028761B1 EP 0028761 B1 EP0028761 B1 EP 0028761B1 EP 80106596 A EP80106596 A EP 80106596A EP 80106596 A EP80106596 A EP 80106596A EP 0028761 B1 EP0028761 B1 EP 0028761B1
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EP
European Patent Office
Prior art keywords
stirrer
phase
stirring
current
phases
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
Application number
EP80106596A
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German (de)
English (en)
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EP0028761A1 (fr
Inventor
Sten Dipl.Ing. Kollberg
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.)
ABB Norden Holding AB
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ASEA AB
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Publication date
Application filed by ASEA AB filed Critical ASEA AB
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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
    • B22D11/12—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

Definitions

  • the invention relates to a method for stirring during continuous casting according to the preamble of claim 1. Such a method is known from DE-A-2911842.
  • the frequency f of the multiphase current can be in the range 0 ⁇ f ⁇ 10 Hz, normally when stirring in so-called slabs (plates) which have a large cross section.
  • it is usually a stirring in the transverse direction, the stirring direction being approximately perpendicular to the pouring direction, while in the other case it is usually a stirring in the longitudinal direction, that is, in the pouring direction.
  • a disadvantage of the aforementioned type of asymmetrical stirring is the relatively poor utilization of the stirrer, since the iron core and the winding of the stirrer are not fully used.
  • a stirrer in the casting strand creates, on the one hand, a stirring force which migrates in the longitudinal direction of the stirrer and is shaped according to the square of a sine function and runs between zero and a maximum and which, when integrated at a fixed location on the casting strand for a certain time, creates a stirring force results in the longitudinal direction of the stirrer resulting stirring force, and on the other hand a substantially sinusoidal, in the longitudinal direction of the stirrer wandering, between an absolutely equal positive maximum and negative minimum, transverse force acting across the surface of the stirrer or the corresponding pole piece, the integral of which at a fixed Position of the casting strand over a certain period of time gives the value zero and therefore does not provide any resulting force, and a (superposed) stationary, temporally and spatially associated in the longitudinal direction of the stirrer, which periodically changes between 0 and a maximum, transverse force acting essentially transversely to the surface of the stirrer or the corresponding pole piece, this superposed trans
  • the last-mentioned force is generated by the asymmetric stirring, while the two first-mentioned forces in the 'essentially by the symmetrical stirrer, however partially also generated by the asymmetric stirrer.
  • the symmetrical agitation is therefore essentially responsible for the motor agitation, while the asymmetric agitation is essentially responsible for the turbulence that occurs, which reduces the viscosity of the melt and contributes to avoiding the so-called white bands.
  • the invention has for its object to develop a method for stirring in continuous casting, in which the stirrers are better used and with which the turbulence in the liquid region of the strand can be adjusted very well.
  • the first and / or second stirrer are / are fed by a phase-asymmetrical current source, wherein the stirrer (s) can be constructed symmetrically or asymmetrically.
  • the stirrer (s) can also be supplied with a different current intensity in one phase relative to at least one other phase.
  • the asymmetry of the stirrer and the current source should correspond to a current difference of 10% (with a pure current asymmetry).
  • the vector diagram according to FIG. 4 shows a three-phase current system R, S, T, the current asymmetry being produced, for example, by the current vector of phase T being smaller than the current vectors of phases R and S, which are of equal size.
  • Figure 5 shows the current vector diagram of a three-phase current system R, S, T in which phase asymmetry has been introduced.
  • the phase angle between the phases R and T is increased by ⁇ ° compared to the symmetrical value of 120 ° and the phase angle between the phases T and S is reduced accordingly by ⁇ °.
  • a is preferably more than 5 °.
  • This phase asymmetry can be achieved, for example, by later ignition of the thyristor feeding the phase T.
  • the phase-asymmetrical feed causes an asymmetrical stirring, which results in a better casting structure, for example in the case of an asymmetrical stirrer 1 (see FIG. 1) which stirs the non-solidified region of a casting strand 3 in accordance with the invention.
  • Figure 1 shows the stirring in the transverse or longitudinal direction of the strand in billets, blooms or slabs with, for example, an electromagnetic, multi-phase-fed stirrer 1, which is designed for asymmetrical stirring, that the supply is either two-phase with a deviation of 90 ° between the two phases or three-phase with a shift between the phases deviating from 120 °.
  • the second stirrer 2 is fed with the same phase system as the first stirrer, but either symmetrically or with a different type of asymmetry than the first stirrer.
  • the stirrers can possibly face each other and both can be designed for stirring in the transverse direction or both for stirring in the longitudinal direction. In special cases, the arrangement angle between the stirrer and the pouring direction can be different for the two stirrers 1 and 2. In both cases, the two stirrers 1, 2 can also be supplied with a phase-asymmetrical stirrer.
  • FIG. 2 shows two three-phase stirrers 1, 2 which are arranged opposite one another on the casting strand 3 emerging from the casting mold 4. Both stirrers have the same direction of stirring. The course of the stirring is indicated by the arrows 5.
  • the second stirrer 2 can work with a mutual phase shift, and with an asymmetry in the phase currents such that the current of one phase deviates by at least 10% from the current of another phase. So a stirrer is used here, in which two options for creating an asymmetry are used simultaneously.
  • the second stirrer 2 can also work with a mutual displacement of the phase currents and an asymmetrical configuration of the phase windings with one another, so that a combination of phase asymmetry and amplitude asymmetry arises.
  • FIG. 3 shows two stirrers 1 and 2 which are arranged one behind the other along the casting strand, for example when pouring billets; here too the same deviations between the two stirrers 1 and 2 can be provided as in the arrangements according to FIGS.
  • both stirring in the transverse direction and stirring in the longitudinal direction can be provided for the two stirrers 1 and 2, as indicated in FIG. 3.
  • Efforts are made to adapt the stirring forces between the stirrers 1 and 2 so that the stirring extends into the mold, ie the stirring flow should extend high into the mold and the white bands should disappear. It is necessary to adjust the stirring force of the stirrer 1 relative to the stirring force of the stirrer 2 so that one of the two stirrers does not dominate too much, which worsens the stirring effect.
  • the ampere turns number for at least one phase deviates by at least 10% from the ampere turn number in another phase.
  • a magnetic traveling wave and a stationary field are thus obtained, and the stirrers are linear and straight.
  • a greater turbulence is obtained under the stirrer, which can be achieved with the various combinations which have been explained above and are shown in the figures.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)

Claims (3)

1. Procédé pour brasser les régions non solidifiées d'une barre de coulée sortant d'une machine de coulée continue, la barre étant formée dans une lingotière (4) et le brassage s'effectuant de manière asymétrique au moyen de dispositifs électromagnétiques de brassage, carac-térisé en ce qu'il consiste à effectuer le brassage avec au moins un premier et un second dispositif de brassage, le premier dispositif de brassage (1) fonctionnant de manière asymétrique par le fait que son alimentation est biphasée avec un déphasage différent de 90° entre les deux phases ou est triphasée avec un déphasage différent de 120° entre les phases, tandis que le second dispositif de brassage (2) fonctionne avec le même nombre de phases que le premier dispositif de brassage, mais d'une manière symétrique ou avec un autre type d'asymétrie que le premier dispositif de brassage; par exemple avec un courant dans une phase qui diffère d'au moins 10% du courant das une autre phase ou avec des bobines de phase montées asymétriquement de manière correspondante.
2. Procédé suivant la revendication 1, carac- térisé en ce qu'il consiste à effectuer le brassage asymétrique des phases avec un déphasage mutuel des phases qui diffère d'au moins 5% du déphasage du système de phases symétriques.
3. Procédé suivant la revendication 1 ou 2, caractérisé en ce qu'il consiste à alimenter le premier et/ou le second dispositif de brassage d'une manière asymétrique aussi bien du point de vue de la phase que du point de vue du courant, l'asymétrie du courant étant obtenue par le fait que le courant dans une phase, diffère d'au moins 10% du courant dans une autre phase et/ou par le fait que les bobines des phases sont formées avec une asymétrie correspondante.
EP80106596A 1979-11-06 1980-10-27 Procédé de brassage lors de la coulée continue Expired EP0028761B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE7909163 1979-11-06
SE7909163A SE430223B (sv) 1979-11-06 1979-11-06 Forfaringssett for omroring vid strenggjutning

Publications (2)

Publication Number Publication Date
EP0028761A1 EP0028761A1 (fr) 1981-05-20
EP0028761B1 true EP0028761B1 (fr) 1985-02-20

Family

ID=20339257

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80106596A Expired EP0028761B1 (fr) 1979-11-06 1980-10-27 Procédé de brassage lors de la coulée continue

Country Status (4)

Country Link
EP (1) EP0028761B1 (fr)
JP (1) JPS5686661A (fr)
DE (1) DE3070220D1 (fr)
SE (1) SE430223B (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5890358A (ja) * 1981-11-06 1983-05-30 Kobe Steel Ltd 溶融金属の連続鋳造における電磁誘導撹拌方法
AT378138B (de) * 1983-11-04 1985-06-25 Voest Alpine Ag Ruehreinrichtung an einer stranggiessanlage
AT379976B (de) * 1984-04-06 1986-03-25 Voest Alpine Ag Ruehreinrichtung an einer stranggiessanlage
JPS61212456A (ja) * 1985-03-15 1986-09-20 Mitsubishi Heavy Ind Ltd 連続鋳造設備における電磁撹拌装置
GB2184674A (en) * 1985-12-19 1987-07-01 Ti Stirring of molten metal during continuous casting
JPS63286257A (ja) * 1987-05-19 1988-11-22 Sumitomo Metal Ind Ltd 電磁撹拌方法
SE465306B (sv) * 1987-11-02 1991-08-26 Asea Ab Saett och anordning foer omroering i gjutstraeng
US20090242165A1 (en) * 2008-03-25 2009-10-01 Beitelman Leonid S Modulated electromagnetic stirring of metals at advanced stage of solidification
AT518460B1 (de) * 2016-03-21 2021-07-15 Primetals Technologies Austria GmbH Einen Metallstrang partiell umgreifende Rührspule
IT202100012824A1 (it) * 2021-05-18 2022-11-18 Ergolines Lab S R L Metodo e dispositivo di agitazione per lingottiera per alluminio o leghe e lingottiera e macchina di colata comprendenti tale dispositivo

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2803503A1 (de) * 1977-02-03 1978-08-10 Asea Ab Zwei- oder mehrphasiger umruehrer
DE2810876A1 (de) * 1977-03-14 1978-09-21 Arbed Verfahren und vorrichtung zum umruehren von im schmelzzustand befindlichen metallen waehrend des kontinuierlichen giessens von brammen
EP0008376A1 (fr) * 1978-07-28 1980-03-05 Concast Holding Ag Procédé de coulée continue de métal dans une lingotière et action d'un champ électro-magnétique
EP0009803A1 (fr) * 1978-10-06 1980-04-16 Concast Holding Ag Procédé de coulée continue d'acier

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5252895Y2 (fr) * 1973-04-18 1977-12-01

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2803503A1 (de) * 1977-02-03 1978-08-10 Asea Ab Zwei- oder mehrphasiger umruehrer
DE2810876A1 (de) * 1977-03-14 1978-09-21 Arbed Verfahren und vorrichtung zum umruehren von im schmelzzustand befindlichen metallen waehrend des kontinuierlichen giessens von brammen
EP0008376A1 (fr) * 1978-07-28 1980-03-05 Concast Holding Ag Procédé de coulée continue de métal dans une lingotière et action d'un champ électro-magnétique
EP0009803A1 (fr) * 1978-10-06 1980-04-16 Concast Holding Ag Procédé de coulée continue d'acier

Also Published As

Publication number Publication date
SE7909163L (fr) 1981-05-07
SE430223B (sv) 1983-10-31
JPS5686661A (en) 1981-07-14
EP0028761A1 (fr) 1981-05-20
JPH0131979B2 (fr) 1989-06-28
DE3070220D1 (en) 1985-03-28

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