EP0094340B1 - Coquille pour la coulée continue avec agitateur électromagnétique - Google Patents

Coquille pour la coulée continue avec agitateur électromagnétique Download PDF

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Publication number
EP0094340B1
EP0094340B1 EP19830710026 EP83710026A EP0094340B1 EP 0094340 B1 EP0094340 B1 EP 0094340B1 EP 19830710026 EP19830710026 EP 19830710026 EP 83710026 A EP83710026 A EP 83710026A EP 0094340 B1 EP0094340 B1 EP 0094340B1
Authority
EP
European Patent Office
Prior art keywords
continuous casting
stirrer
mould
plates
slots
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
EP19830710026
Other languages
German (de)
English (en)
Other versions
EP0094340A1 (fr
Inventor
Jan-Erik Dipl.-Ing. Eriksson
Curt Ing. Holmgren
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
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 ASEA AB filed Critical ASEA AB
Publication of EP0094340A1 publication Critical patent/EP0094340A1/fr
Application granted granted Critical
Publication of EP0094340B1 publication Critical patent/EP0094340B1/fr
Expired legal-status Critical Current

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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
    • B22D11/10—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 invention relates to a continuous casting mold with an electromagnetic stirrer according to the preamble of claim 1.
  • the mold When stirring in the cast strand in the mold during continuous casting, for example of steel, the mold often consists of copper or copper alloy plates which laterally surround the cast strand.
  • the stirrers have to be arranged outside the plates for reasons of space and for other reasons, the problem being that the magnetic field of the stirrers always has to pass through the plates, and it is strongly dampened due to the low penetration depth. This damping is based on eddy currents that occur in the plates. Care must also be taken to ensure that the heat flow from the cast strand can pass through the plates as freely as possible.
  • a continuous casting mold is known from DE-A-1 558 312, in which the mold walls contain cooling channels open to the outside, but which are covered by thick supporting plates and a supporting frame adjoining them. Stirrers are not used here either. A stirrer could not be brought close to the mold wall because of the support frame, and the magnetic field of a stirrer would be strongly damped by the relatively thick support plates.
  • the invention has for its object to develop a continuous casting mold of the type mentioned, in which the problems outlined at the outset are largely eliminated.
  • a continuous casting mold In a continuous casting mold according to the invention, the eddy currents that occur are relatively small. As a result, only slight eddy current losses occur in the plates, and at the same time the heat flow can pass through the plates relatively easily.
  • a multi-phase arrangement results in a rotating agitation transverse to the pouring direction, whereby the desired agitation effect is achieved.
  • This type of mold can be used for slabs (slabs), blooms (blooms) and billets (billets). For example, with a two-phase stirrer feed, a good rotating stirrer can be obtained in a slab, bloom, etc.
  • the frequency in the stirring of slabs is, for example, 0.5 to 4 Hz, preferably 1 to 2 Hz, in the stirring of blooms 3 to 15 Hz and in the stirring of billets 5 to 50 Hz.
  • the copper plate causes the is normally present between the stirrer and the melt, without the grooves according to the invention a very strong damping of the magnetic field.
  • the grooves are made laterally and closed to the outside by other parts of the plates (closed grooves), or they are open to the stirrer side and by a plate or several separate plates made of non-magnetic material, e.g. stainless steel, covered.
  • a coolant e.g. Water
  • coolant flows from the bottom to the top edge of the plates.
  • the grooves are thus combined with cooling channels and, at the same time, good cooling of the mold, low damping of the magnetic field and a considerable reduction in the eddy currents flowing in the copper plates are obtained.
  • Figure 1 shows an electromagnetic stirrer 1 with winding 2 and iron core 3, which is arranged on the side of a mold 4, of which only a wall section is shown.
  • the mold is part of the system for continuous To water.
  • the wall section consists of a plate 5, one of for example four plates, which form the side walls of the continuous casting mold.
  • the pouring direction in Figure 1 runs parallel to the plane of the drawing from top to bottom.
  • the plate In order to dampen the eddy currents described above, which occur during the feeding of the stirrer 1, possibly the stirrer, the plate is provided with grooves 6 on its side facing the stirrer, the bottom of which is a distance 7 from the other side of the plate 5 has at least 2 to 4 mm. Most of the plate thickness 8 is traversed by grooves 6 which have a damping effect on the eddy currents which arise when the magnetic field of the stirrer penetrates the plate 5.
  • the penetration depth of the magnetic field into the material in this case copper
  • Q means the specific resistance of the material in ohmmeters, ⁇ the angular frequency of the feeding current, I l o the absolute permeability and I l r the relative permeability of the material mentioned.
  • the penetration depth 8 results in meters.
  • the penetration depth 8 in copper is 12 to 14 mm.
  • the distance between the grooves 6 should be approximately equal to the depth of penetration.
  • the plates are made of copper or a copper alloy and the grooves are normally directed outwards from the melt 9.
  • the grooves may also be used as channels for coolant, e.g. Water, serve. They are then closed on the side; for example, they can be machined into the plate as closed grooves or, as shown in Figure 1, open grooves can be provided with an outer sealing plate 10 made of non-magnetic material, e.g. stainless steel, be sealed.
  • coolant e.g. Water
  • open grooves can be provided with an outer sealing plate 10 made of non-magnetic material, e.g. stainless steel, be sealed.
  • the direction of the induced eddy currents is indicated by arrow 11.
  • stirrer is only arranged on one side of the mold, it may be sufficient to build the mold only on this side with a grooved plate 5.
  • all the plates of the mold lying in front of a stirrer are to be provided with grooves. The grooves are usually directed outwards.
  • the grooves 6 normally run perpendicular to the eddy current direction 11, and the cooling channels should run from the upper edge 12 to the lower edge 13 of the plate (see FIG. 2).
  • the plate 5 is cooled by flowing coolant, which normally flows from the lower edge 13 to the upper edge 12. So the eddy current damping grooves are combined with the cooling channels.
  • the eddy current damping grooves on the one hand and the cooling channels on the other hand can also be arranged completely or partially separated from one another.
  • the cooling channels / grooves 6 run diagonally across the plate 5. This results in improved suppression of the eddy currents.
  • the angle 14 between the groove 6 and the lower edge 13 is preferably in the range from 30 to 60 °.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Food-Manufacturing Devices (AREA)

Claims (6)

1. Lingotière de coulée continue ayant un ou plusieurs dispositifs électromagnétiques de brassage, cette lingotière (4) étant formée de plusieurs plaques de lingotière (5) en cuivre ou en alliages de cuivre, par exemple de quatre plaques, entourant la barre de coulée, chaque dispositif de brassage (1) étant disposé directement devant le côté extérieur d'une plaque de lingotière (5), caractérisée en ce qu'au moins la (les) plaque(s) de lingotière se trouvant devant le (les) dispositif(s) de brassage est (sont) munie(s) de gorges (6) qui sont ouvertes vers le dispositif de brassage, qui s'étendent de manière à couper les chemins des courants de Foucault induits par le champ du dispositif de brassage, et dont la profondeur est inférieure à l'épaisseur (8) des plaques de lingotière (5).
2. Lingotière de coulée continue suivant la revendication 1, caractérisée en ce que les gorges (6) s'étendent sensiblement perpendiculairement aux surfaces latérales de la barre de coulée.
3. Lingotière de coulée continue suivant la revendication 1 ou 2, caractérisée en ce que les gorges de la plaque de lingotière (5) peuvent être recouvertes d'une manière étanche, du côté de la lingotière de coulée (5) qui est tourné vers le dispositif de brassage, d'une ou de plusieurs plaques auxiliaires (10) non portantes, en matériau amagnétique par exemple en acier inoxydable.
4. Lingotière de coulée continue suivant la revendication 3, caractérisée en ce que les gorges sont raccordées à un système pour un agent de refroidissement, dans lequel circule un agent de refroidissement.
5. Lingotière de coulée continue suivant l'une des revendications précédentes, caractérisée en ce qu'au moins une partie des gorges (6) va du bord supérieur (12) au bord inférieur (13) de la plaque de lingotière (5), et cela de préférence en faisant un angle (14) par rapport au bord (13) mentionné qui, de préférence, est compris entre 30 et 60 grade.
6. Lingotière de coulée continue suivant l'une des revendications précédentes, caractérisée en ce que la distance entre le fond des gorges (6) et le côté opposé de la plaque de lingotière (5) est d'au moins 2 à 4 mm.
EP19830710026 1982-05-12 1983-05-05 Coquille pour la coulée continue avec agitateur électromagnétique Expired EP0094340B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8202989A SE8202989L (sv) 1982-05-12 1982-05-12 Strenggjutningskokill med elektromagnetisk omrorare
SE8202989 1982-05-12

Publications (2)

Publication Number Publication Date
EP0094340A1 EP0094340A1 (fr) 1983-11-16
EP0094340B1 true EP0094340B1 (fr) 1986-09-17

Family

ID=20346794

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830710026 Expired EP0094340B1 (fr) 1982-05-12 1983-05-05 Coquille pour la coulée continue avec agitateur électromagnétique

Country Status (4)

Country Link
EP (1) EP0094340B1 (fr)
JP (1) JPS58205651A (fr)
DE (1) DE3366218D1 (fr)
SE (1) SE8202989L (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE501322C2 (sv) * 1993-01-19 1995-01-16 Asea Brown Boveri Anordning vid stränggjutning i kokill

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2007587C3 (de) * 1970-02-19 1974-10-17 Demag Ag, 4100 Duisburg Kühlplattenzone unterhalb einer Metall-Stranggießkokille
AT359225B (de) * 1978-03-23 1980-10-27 Voest Alpine Ag Drehfeld-stranggiesskokille

Also Published As

Publication number Publication date
DE3366218D1 (en) 1986-10-23
EP0094340A1 (fr) 1983-11-16
JPS58205651A (ja) 1983-11-30
SE8202989L (sv) 1983-11-13

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