EP0030910B1 - Tauchrohre für elektrorotierendes Stranggiessen von Metallen - Google Patents

Tauchrohre für elektrorotierendes Stranggiessen von Metallen Download PDF

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Publication number
EP0030910B1
EP0030910B1 EP80630055A EP80630055A EP0030910B1 EP 0030910 B1 EP0030910 B1 EP 0030910B1 EP 80630055 A EP80630055 A EP 80630055A EP 80630055 A EP80630055 A EP 80630055A EP 0030910 B1 EP0030910 B1 EP 0030910B1
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EP
European Patent Office
Prior art keywords
vanes
nozzles according
central tube
nozzles
metal
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
EP80630055A
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English (en)
French (fr)
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EP0030910A1 (de
Inventor
Paul Metz
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.)
Arcelor Luxembourg SA
Original Assignee
Arbed SA
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 Arbed SA filed Critical Arbed SA
Priority to AT80630055T priority Critical patent/ATE4965T1/de
Publication of EP0030910A1 publication Critical patent/EP0030910A1/de
Application granted granted Critical
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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
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B22D41/507—Pouring-nozzles giving a rotating motion to the issuing molten metal
    • 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 present invention relates to plunging nozzles used in electrorotative continuous casting of liquid metals, in particular steel.
  • the rotation of the liquid metal has certain advantages compared to static casting, in particular that of bringing a favorable modification to the solidification structure by eliminating the basaltic zone in favor of a finer solidification structure.
  • the most rational way to carry out the stirring or the rotation of the metal not yet solidified, as well at the level of the ingot mold as in the zone of the secondary cooling, consists in putting the metal in movement by mechanical, pneumatic way or with l using an electromagnetic field.
  • the latter can be created by one or more inductors that are positioned around the mold or even below it, to generate fields of specific configurations.
  • the inclusions tend to collect in the area of the axis of the bar and to be sucked into the liquid metal under the effect of the vortex. creates. This produces a product having an axial zone with too high a concentration of inclusions.
  • the object of the invention therefore consisted in imagining and developing a device allowing the conduct of a continuous electrorotative casting with protection of the metal surface by slag, while avoiding the risks described which are linked to the vortex effect due when the metal rotates in the mold.
  • plunging nozzles which consist in particular of a central tube comprising an upper part in which the pouring jet ends and a lower part which plunges into the liquid metal and which are characterized in that they include external blades to the central tube, radial with respect to the axis of the ingot mold, which blades press against the central tube and plunge at least partially under the surface of the liquid metal.
  • the idea is at the base of the present invention consists in using a device which does not significantly hamper the actual rotation of the liquid metal continuously cast, while opposing a mechanical brake to the zone which comprises the surface of the metal on which floats a slag or protective slag.
  • This mechanical brake therefore acts in particular on the area of the metal-slag interface in the sense that it immobilizes the latter, which prevents the formation of a vortex due to the rotation of the liquid metal, and thereby eliminates the entrainment within the metal of non-metallic particles.
  • a nozzle which has 4 blades extending either towards the middle of the 4 walls of the mold, or towards the 4 corners of the latter.
  • the dimensions of the blades are chosen according to the arrangement of the nozzle in the ingot mold so that the ends of the blades approach substantially the walls respectively of the corners of the ingot mold, without however touching them. It has proven to be advantageous to size the blades so that the length of the assembly (2 blades + diameter of the nozzle tube) corresponds to 50-95% of the length, respectively of the width or even to the diagonal of the mold. It is understood that the length of the blades will be limited according to the flowability of the metal, to avoid solidification of the latter in the area of the surface of the bath.
  • a first embodiment of the nozzles according to the invention provides blades in the form of a parallelepiped, while according to a second embodiment the blades may have fins which touch the central tube of the nozzle and which are directed towards the bottom. These fins help to slow down the rotation of the metal in the critical zone i.e. at the metal-slag interface as well as below said zone.
  • a third embodiment provides fins which have a helical shape directed upside down in the direction of the rotary movement which is printed on the liquid metal.
  • the nozzles can also be provided, according to a particularly advantageous embodiment, with a mechanical drive system which imparts to them a rotational movement in the opposite direction to that which is caused to be carried out with liquid metal. .
  • the nozzles according to the invention may on the one hand be in one piece. On the other hand it is it is it is possible to mount the blades individually on a ring which surrounds the central tube of a conventional nozzle. This second possibility brings a certain flexibility and savings since it allows the use of ordinary known nozzles.
  • FIG. 1 shows a view from above on a nozzle according to the invention
  • FIG. 2 shows a side section through the same nozzle
  • FIGS. 3 and 4 show side sections of nozzles which have blades with straight fins resp. helical.
  • FIG. 1 In fig. 1 is shown the section of an ingot mold (1 a) resp. (1 b) in which there is a nozzle according to the invention, which comprises a central pipe (2) and 4 blades (3).
  • the distance from the end of a blade facing a wall of the mold (1 a) can be less than the distance between the end of a blade and a corner of the mold (1 b) , due to the fact that there can be less eddy in the areas of the corners of the molds than in the areas along the middle parts of the walls.
  • Fig. 4 shows a nozzle having blades (3) with fins (5) of helical shape. This helical shape is usefully directed upside down in the direction of rotation (R) of the metal, so that the slag particles are pushed up during the rotation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Claims (10)

1. Tauchausgüsse für elektrorotierendes Stranggiessen von flüssigen Metallen, insbesondere Stahl, welche im wesentlichen aus einem Zentral-Rohr (2) bestehen welches einen oberen Teil hat in den der Giess-strahl endet sowie einen unteren Teil der in das flüssige Metall taucht, dadurch gekennzeichnet, dass sie Schaufeln (3) aufweisen, die aussen am Zentral- rohr (2) angeordnet und radial zur KokillenAchse ausgerichtet sind, wobei die Schaufeln (3) an das Zentralrohr (2) angelehnt sind und zumindest teilweise unter den flüssigen Metallspiegel ragen.
2. Tauchausgüsse gemässe Anspruch 1, dadurch gekennzeichnet, dass wenigstens vier Schaufeln (3) sich gegen die Wandmitten der Kokille ausbreiten.
3. Tauchausgüsse gemäss Anspruch 1, dadurch gekennzeichnet, dass wenigstens vier Schaufeln (3) sich gegen die Ecken der Kokille ausbreiten.
4. Tauchausgüsse gemäss den Ansprüchen 1-3, dadurch gekennzeichnet, dass die Strecke bestehend aus der Länge von zwei Schaufeln und dem Durchmesser des Zentralrohrs (2), 50-95% des Durchmessers bzw. der Diagonale der Kokille beträgt.
5. Tauchausgüsse gemäss den Ansprüchen 1-4, dadurch gekennzeichnet, dass die Schaufeln (3) die Form eines Parallelepipeds aufweisen.
6. Tauchausgüsse gemäss den Ansprüchen 1-5, dadurch gekennzeichnet, dass die Schaufeln (3) Flügel (4, 5) aufweisen, welche sich an das Zentral-Rohr lehnen und nach unten ausgerichtet sind.
7. Tauchausgüsse gemäss Anspruch 6, dadurch gekennzeichnet, dass die Flügel (5) schraubenförmig, entgegen der Drehrichtung des flüssigen Metalls, ausgebildet sind.
8. Tauchausgüsse gemäss den Ansprüchen 1-7, dadurch gekennzeichnet, dass sie mit einer mechanischen Antriebsvorrichtung versehen sind, welche ihnen eine Drehbewegung auferlegt deren Drehrichtung der dem flüssigen Metall aufgezwungenen Drehrichtung (R) entgegengesetzt ist.
9. Tauchausgüsse gemäss den Ansprüchen 1-8, dadurch gekennzeichnet, dass sie aus einem Stück bestehen.
10. Tauchausgüsse gemäss den Ansprüchen 1-8, dadurch gekennzeichnet, dass die Schaufeln (3) individuell an einem Ring befestigt sind, welcher das Zentralrohr (2) eines herkömmlichen Tauchausgusses umgibt.
EP80630055A 1979-12-17 1980-11-26 Tauchrohre für elektrorotierendes Stranggiessen von Metallen Expired EP0030910B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80630055T ATE4965T1 (de) 1979-12-17 1980-11-26 Tauchrohre fuer elektrorotierendes stranggiessen von metallen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU82001A LU82001A1 (fr) 1979-12-17 1979-12-17 Busettes plongeantes utilisees en coulee continue electrorotative de metaux
LU82001 1979-12-17

Publications (2)

Publication Number Publication Date
EP0030910A1 EP0030910A1 (de) 1981-06-24
EP0030910B1 true EP0030910B1 (de) 1983-10-12

Family

ID=19729313

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80630055A Expired EP0030910B1 (de) 1979-12-17 1980-11-26 Tauchrohre für elektrorotierendes Stranggiessen von Metallen

Country Status (6)

Country Link
US (1) US4387761A (de)
EP (1) EP0030910B1 (de)
AT (1) ATE4965T1 (de)
CA (1) CA1153864A (de)
DE (1) DE3065321D1 (de)
LU (1) LU82001A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MX395171B (es) * 2015-07-02 2025-03-19 Vesuvius U S A Corp Modificador de salida de artesa.
CN108247033B (zh) * 2018-01-17 2020-07-21 武汉科技大学 一种连铸中间包用旋流上水口
EP3900855A1 (de) 2020-04-21 2021-10-27 Refractory Intellectual Property GmbH & Co. KG Drehbarer einsatz und tauchdüse

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB748709A (en) * 1953-06-22 1956-05-09 Siegfried Junghans Improvements in or relating to a method of continuously casting metals by means of cooled throughflow moulds
FR2150723A1 (en) * 1971-09-01 1973-04-13 Centrifugation Et Continuous casting of circular bars - rotation of molten metal in mould improves properties of cast bar
FR2156373A1 (en) * 1971-10-16 1973-05-25 Nippon Steel Corp Spin caster mechanism - for molten metal
FR2156751A1 (de) * 1971-10-21 1973-06-01 Voest Ag

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1802884B2 (de) * 1968-10-12 1973-04-05 Demag Ag, 4100 Duisburg Verfahren zum zufuehren des giessmetalls in die stranggiess-kokille einer metall-, insbesondere stahl-stranggiessanlage
CA887556A (en) * 1968-12-12 1971-12-07 Exothermic Company Of Canada Limited Method and apparatus for providing slag for continuous casting molds

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB748709A (en) * 1953-06-22 1956-05-09 Siegfried Junghans Improvements in or relating to a method of continuously casting metals by means of cooled throughflow moulds
FR2150723A1 (en) * 1971-09-01 1973-04-13 Centrifugation Et Continuous casting of circular bars - rotation of molten metal in mould improves properties of cast bar
FR2156373A1 (en) * 1971-10-16 1973-05-25 Nippon Steel Corp Spin caster mechanism - for molten metal
FR2156751A1 (de) * 1971-10-21 1973-06-01 Voest Ag

Also Published As

Publication number Publication date
US4387761A (en) 1983-06-14
DE3065321D1 (en) 1983-11-17
LU82001A1 (fr) 1981-07-23
ATE4965T1 (de) 1983-10-15
CA1153864A (fr) 1983-09-20
EP0030910A1 (de) 1981-06-24

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