EP0028761B1 - Verfahren zum Umrühren beim Stranggiessen - Google Patents
Verfahren zum Umrühren beim Stranggiessen Download PDFInfo
- 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
- Authority
- 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
Links
- 238000003756 stirring Methods 0.000 title claims description 42
- 238000000034 method Methods 0.000 title claims description 12
- 238000009749 continuous casting Methods 0.000 title claims description 5
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 238000005266 casting Methods 0.000 description 12
- 239000013598 vector Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000013019 agitation Methods 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000035508 accumulation Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Images
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
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)
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 EP0028761A1 (de) | 1981-05-20 |
EP0028761B1 true EP0028761B1 (de) | 1985-02-20 |
Family
ID=20339257
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP80106596A Expired EP0028761B1 (de) | 1979-11-06 | 1980-10-27 | Verfahren zum Umrühren beim Stranggiessen |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0028761B1 (ja) |
JP (1) | JPS5686661A (ja) |
DE (1) | DE3070220D1 (ja) |
SE (1) | SE430223B (ja) |
Families Citing this family (10)
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)
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 (de) * | 1978-07-28 | 1980-03-05 | Concast Holding Ag | Verfahren zum Stranggiessen von Metall in eine Kokille und Einwirkung eines elektromagnetischen Feldes |
EP0009803A1 (de) * | 1978-10-06 | 1980-04-16 | Concast Holding Ag | Verfahren zum Stranggiessen von Stahl |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5252895Y2 (ja) * | 1973-04-18 | 1977-12-01 |
-
1979
- 1979-11-06 SE SE7909163A patent/SE430223B/sv not_active IP Right Cessation
-
1980
- 1980-10-27 EP EP80106596A patent/EP0028761B1/de not_active Expired
- 1980-10-27 DE DE8080106596T patent/DE3070220D1/de not_active Expired
- 1980-11-04 JP JP15511480A patent/JPS5686661A/ja active Granted
Patent Citations (4)
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 (de) * | 1978-07-28 | 1980-03-05 | Concast Holding Ag | Verfahren zum Stranggiessen von Metall in eine Kokille und Einwirkung eines elektromagnetischen Feldes |
EP0009803A1 (de) * | 1978-10-06 | 1980-04-16 | Concast Holding Ag | Verfahren zum Stranggiessen von Stahl |
Also Published As
Publication number | Publication date |
---|---|
EP0028761A1 (de) | 1981-05-20 |
JPS5686661A (en) | 1981-07-14 |
SE7909163L (ja) | 1981-05-07 |
DE3070220D1 (en) | 1985-03-28 |
SE430223B (sv) | 1983-10-31 |
JPH0131979B2 (ja) | 1989-06-28 |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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