EP0028761A1 - 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
EP0028761A1
EP0028761A1 EP80106596A EP80106596A EP0028761A1 EP 0028761 A1 EP0028761 A1 EP 0028761A1 EP 80106596 A EP80106596 A EP 80106596A EP 80106596 A EP80106596 A EP 80106596A EP 0028761 A1 EP0028761 A1 EP 0028761A1
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EP
European Patent Office
Prior art keywords
stirrer
phase
stirring
phases
current
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.)
Granted
Application number
EP80106596A
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German (de)
English (en)
Other versions
EP0028761B1 (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
Original Assignee
ASEA AB
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Publication date
Application filed by ASEA AB filed Critical ASEA AB
Publication of EP0028761A1 publication Critical patent/EP0028761A1/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
    • B22D11/12—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 stirring of the non-solidified areas of a casting strand is already known in various designs. It is known, inter alia, to stir these areas at one or more points transversely to the casting direction by means of an electromagnetic stirrer.
  • One reason for this stirring is that cavities (so-called mini-ingots) and segregations in the finished casting (blank) are to be avoided and that the solidification front is as uniform as possible.
  • a problem with this type of stirring is that so-called white tapes, ie tapes with negative segregation, are formed when the melt is suddenly set into an all-too strong stirring movement. When steel solidifies, crystals, so-called dendrites, form between which there is an accumulation of sulfur and carbon.
  • the frequency / multi-phase current can be in the range 0 ⁇ f 10 10 Hz, usually when stirring in so-called slabs (plates) that 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 normally a stirring in the longitudinal direction, that is, in the pouring direction.
  • a disadvantage of the type of asymmetrical stirring mentioned is the relatively poor utilization of the stirrer; Iron core and winding of the stirrer are underused here.
  • One way to solve this problem is known from the Swedish patent application 7902317-2; Thereafter, either two or more stirrers or a stirrer and a separate coil are used, in the former case both or all stirrers being fed with multiphase current and the stirring being carried out symmetrically by at least one of the stirrers, while the stirring by at least one of the another is carried out asymmetrically in that either the phase current in one phase deviates by at least 10% from the phase current in another phase and / or in that the phase coils are designed correspondingly asymmetrically with respect to one another.
  • a stirrer in the casting strand on the one hand creates one in the longitudinal direction of the stirring rers wandering, shaped according to the square of a sine function, running between zero and a maximum stirring force, which, when integrated at a fixed location on the casting strand for a certain time, results in a stirring force resulting in the longitudinal direction of the stirrer, and on the other hand a substantially sinusoidal , shear force migrating in the longitudinal direction of the stirrer, running between an absolutely equal positive maximum and negative minimum, acting transversely to the surface of the stirrer or the corresponding pole piece, the integral of which at a fixed point on the casting strand gives the value zero over a certain time and thus provides no resulting force, and a (superposed) stationary, temporally and spatially associated longitudinal force of the stirrer which changes periodically between 0 and a maximum and acts transversely to the surface of the stirrer or the corresponding pole piece put together, whereby this superposed transverse force produces a strong increase in the
  • the first and / or second stirrer can be fed by a phase-asymmetrical current source, wherein the stirrer (s) can be designed 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 established, 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.
  • FIG. 5 shows the current vector diagram of a three-phase current system R, S, T, in which a 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 correspondingly reduced by cr °, ⁇ 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.
  • 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. 1 and 2.
  • both stirring in the transverse direction and stirring in the longitudinal direction can be provided for the two stirrers 1 and 2, as is indicated in FIG. 3.
  • the aim is to adapt the stirring forces between the stirrers 1 and 2 so that the stirring extends into the mold, ie the stirring flow should reach 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
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
SE7909163A SE430223B (sv) 1979-11-06 1979-11-06 Forfaringssett for omroring vid strenggjutning
SE7909163 1979-11-06

Publications (2)

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

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2578767A1 (fr) * 1985-03-15 1986-09-19 Mitsubishi Heavy Ind Ltd Agitateur electromagnetique pour installations de moulage en regime continu
GB2184674A (en) * 1985-12-19 1987-07-01 Ti Stirring of molten metal during continuous casting
US4699205A (en) * 1984-04-06 1987-10-13 Voest-Alpine Aktiengesellschaft Method of establishing a turbulent motion of molten steel within a strand guide
EP0317789A1 (fr) * 1987-11-02 1989-05-31 Asea Brown Boveri Ab Procédé et dispositif pour traiter les parties non solidifiées d'une barre de coulée
US4852635A (en) * 1981-11-06 1989-08-01 Kabushiki Kaisha Kobe Seiko Sho Method of electromagnetic stirring in continuous metal casting process
US4867786A (en) * 1987-05-19 1989-09-19 Sumitomo Metal Industries, Ltd. Electromagnetic stirring method
US4909306A (en) * 1983-11-04 1990-03-20 Voest-Alpine International Corporation Stirring provision for a continuous casting plant
EP2268431A4 (fr) * 2008-03-25 2017-07-12 ABB Inc. Brassage électromagnétique modulé de métaux à un stade avancé de solidification
AT518460A1 (de) * 2016-03-21 2017-10-15 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 (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2401145A1 (de) * 1973-04-18 1974-10-31 Nippon Steel Corp Verfahren und vorrichtung zum kontinuierlichen giessen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH627956A5 (de) * 1977-02-03 1982-02-15 Asea Ab Elektromagnetische mehrphasige ruehrvorrichtung an einer stranggiessmaschine.
LU76942A1 (fr) * 1977-03-14 1978-10-18
DE2965366D1 (en) * 1978-07-28 1983-06-16 Concast Holding Ag Method for continuously casting metal in a mould and influence of an electro-magnetic field
CH632431A5 (de) * 1978-10-06 1982-10-15 Concast Ag Verfahren zum stranggiessen von stahl.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2401145A1 (de) * 1973-04-18 1974-10-31 Nippon Steel Corp Verfahren und vorrichtung zum kontinuierlichen giessen

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4852635A (en) * 1981-11-06 1989-08-01 Kabushiki Kaisha Kobe Seiko Sho Method of electromagnetic stirring in continuous metal casting process
US4909306A (en) * 1983-11-04 1990-03-20 Voest-Alpine International Corporation Stirring provision for a continuous casting plant
US4699205A (en) * 1984-04-06 1987-10-13 Voest-Alpine Aktiengesellschaft Method of establishing a turbulent motion of molten steel within a strand guide
FR2578767A1 (fr) * 1985-03-15 1986-09-19 Mitsubishi Heavy Ind Ltd Agitateur electromagnetique pour installations de moulage en regime continu
GB2184674A (en) * 1985-12-19 1987-07-01 Ti Stirring of molten metal during continuous casting
US4867786A (en) * 1987-05-19 1989-09-19 Sumitomo Metal Industries, Ltd. Electromagnetic stirring method
EP0317789A1 (fr) * 1987-11-02 1989-05-31 Asea Brown Boveri Ab Procédé et dispositif pour traiter les parties non solidifiées d'une barre de coulée
EP2268431A4 (fr) * 2008-03-25 2017-07-12 ABB Inc. Brassage électromagnétique modulé de métaux à un stade avancé de solidification
AT518460A1 (de) * 2016-03-21 2017-10-15 Primetals Technologies Austria GmbH Einen Metallstrang partiell umgreifende Rührspule
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

Also Published As

Publication number Publication date
DE3070220D1 (en) 1985-03-28
SE430223B (sv) 1983-10-31
SE7909163L (fr) 1981-05-07
JPH0131979B2 (fr) 1989-06-28
JPS5686661A (en) 1981-07-14
EP0028761B1 (fr) 1985-02-20

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