EP0290423B1 - Vorrichtung zur kontinuierlichen Herstellung eines dünnen Metallbands - Google Patents

Vorrichtung zur kontinuierlichen Herstellung eines dünnen Metallbands Download PDF

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Publication number
EP0290423B1
EP0290423B1 EP19880870083 EP88870083A EP0290423B1 EP 0290423 B1 EP0290423 B1 EP 0290423B1 EP 19880870083 EP19880870083 EP 19880870083 EP 88870083 A EP88870083 A EP 88870083A EP 0290423 B1 EP0290423 B1 EP 0290423B1
Authority
EP
European Patent Office
Prior art keywords
metal
section
mould
wall
tube
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 - Lifetime
Application number
EP19880870083
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English (en)
French (fr)
Other versions
EP0290423A2 (de
EP0290423A3 (en
Inventor
Stéphan Wilmotte
Yves Hardy
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.)
Centre de Recherches Metallurgiques CRM ASBL
Original Assignee
Centre de Recherches Metallurgiques CRM ASBL
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
Priority claimed from BE8700525A external-priority patent/BE1000528A6/fr
Priority claimed from BE8701460A external-priority patent/BE1001298A6/fr
Application filed by Centre de Recherches Metallurgiques CRM ASBL filed Critical Centre de Recherches Metallurgiques CRM ASBL
Priority to AT88870083T priority Critical patent/ATE78733T1/de
Publication of EP0290423A2 publication Critical patent/EP0290423A2/de
Publication of EP0290423A3 publication Critical patent/EP0290423A3/fr
Application granted granted Critical
Publication of EP0290423B1 publication Critical patent/EP0290423B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/126—Accessories for subsequent treating or working cast stock in situ for cutting
    • 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
    • B22D11/006—Continuous casting of metals, i.e. casting in indefinite lengths of tubes

Definitions

  • the present invention relates to a device for the continuous production of a thin metal strip according to the preamble of claim 1.
  • thin metal strip is meant, within the meaning of the present invention, a metal strip whose thickness does not not exceed about 10 mm.
  • Document JP-A-60 261654 also discloses a device for manufacturing a strip by helical cutting of a tube cast by centrifugation.
  • the metal is poured in a horizontal direction and the device comprises a single rotary section, provided with cooling means and secured to a casting container which is also rotary.
  • the object of the present invention is to provide a particular device for implementing the process for the continuous production of a thin metal strip from a molten metal, into which said metal is poured by centrifugation into a tube having the desired thickness and in that said metal tube is cut along a helical line, in order to form a continuous strip.
  • a device for the continuous production of a thin metal strip from a molten metal which comprises a tubular mold for forming a layer of metal along the wall of the mold, with means cooling in which is applied to said layer of metal a cooling causing the complete solidification of said metal into a solid tube and with an apparatus for cutting said tube along a helical line, is characterized in that said mold is mounted in a vertical position and in what it comprises at least two successive sections in which the metal is forced to flow from top to bottom in a thin blade animated by a movement of gyration along the interior wall of said mold.
  • the molten metal successively passes through a tubular mold in which it is forced to flow from top to bottom in a thin blade animated by a movement of gyration along the interior wall of said mold, and in which there is applied a cooling which causes a partial solidification of said metal, then an element comprising secondary cooling means causing complete solidification of said metal into a solid tube, and finally an apparatus for cutting said tube along an inclined helical line of an angle appropriate to the desired width of the metal strip.
  • At least the second of said sections can rotate around its longitudinal axis.
  • the first section is advantageously equipped with means for distributing the molten metal on its interior wall as well as means for imparting to said molten metal a movement of gyration along said interior wall.
  • said first section has an internal section which increases in the direction of progression of the molten metal through said first section.
  • the internal section of said first section increases continuously over at least part of the length thereof; in particular, this continuous increase in the internal section can be regular, so as to give this first section a frustoconical shape over the corresponding part of its length.
  • said first section is made of a material which is a good conductor of heat, in particular copper. Therefore, the molten metal can undergo controlled cooling in this first section, so as to be in a pasty state, that is to say partially solidified, at the outlet of said first section. The vigorous stirring carried out during cooling ensures a sufficiently low viscosity of the pasty mixture.
  • the means for distributing the molten metal on the inner wall of said first section comprise a nozzle with closed end and having one or more lateral ducts for exit from the molten metal.
  • said outlet conduits can be oriented so as to give the molten metal which leaves therefrom a movement having a tangential component relative to the interior wall of said first section. It is thus possible to initiate the turning movement of the molten metal in said first section.
  • This tangential component can itself be inclined relative to a horizontal plane, in order to limit the dynamic effects of the impact of the molten metal against the interior wall of said first section.
  • the means for imparting to the molten metal a movement of gyration along the wall of said first section can be constituted by any mechanical drive device known per se.
  • the secondary cooling means are preferably fixed and produce a sheet of water which flows at high speed along the metal tube during solidification.
  • Downstream of said secondary cooling means is arranged a device for cutting said tube along a helical line.
  • This device comprises drive rollers imparting to the metal tube a combined movement of axial progression and rotation, as well as at least one cutting tool oriented so as to carry out the cutting along the desired helical line.
  • Figure I schematically shows a longitudinal section through a device according to the invention for the manufacture of a thin metal strip from molten steel.
  • the device of the invention is installed under a container, not shown, such as a ladle, equipped with a pouring nozzle 1.
  • This device essentially consists of a mold comprising a first section H1 and a second section H2, a cooling system H3 and a cutting device 9, 10.
  • the first section H1 consists of a tubular element 3 provided with a distributor plate 2 which ensures the formation of a film of molten steel and its flow on the interior surface of this tubular element 3; it also includes an inductor intended to impart to this steel film a rotational movement which ensures its good contact with the wall as well as its uniform distribution along this wall.
  • the inductor 4 is arranged around the tubular element 3; it goes without saying that this inductor 4 could, without departing from the scope of the invention, be arranged inside the tubular element 3 or even partly outside and partly inside said element.
  • the second section H2 of the mold consists of an ingot mold 6 made of copper, cooled with water and driven in a rotational movement around its longitudinal axis. This ingot mold is supported by a device 7 allowing its rotation.
  • the cooling system H3 comprises means for forming a sheet of homogeneous water flowing at high speed along the cast steel tube.
  • the cutting device comprises rollers 9 imparting to the cast steel tube a spiral movement which ensures both the rotation and the axial progression of the steel tube.
  • rollers 9 are followed by a cutting tool, for example a slitting disc 10, which operates the cutting of the steel tube along the desired helical line.
  • This cutting device can also be associated with a pipe 13 for injecting a neutral gas such as argon, inside the cast steel tube.
  • a neutral gas such as argon
  • the liquid steel flowing from the nozzle 1 is deflected by the distributor plate 2 so as to form a steel film on the inner wall of the refractory tubular element 3.
  • the inductor 4 prints this steel film a gyratory movement at a predetermined speed.
  • the steel film enters the ingot mold 6 which rotates about its longitudinal axis and which thus maintains the gyratory movement of the steel film.
  • a lubricant is added to the ingot mold at 5.
  • the cooling applied by the ingot mold 6 causes the steel film to solidify, which then leaves the ingot mold in the form of a tube in the pasty state. This tube is cooled vigorously, in the device 8, by a sheet of water which flows at high speed along its outer surface.
  • the argon blown through the pipe 13 also contributes to the cooling of the interior surface of this tube.
  • the solidified steel tube 11 is gripped by rollers 9 which impart to it a movement of rotation and axial progression, then the tube is cut by a disc 10 into a continuous strip 12 of width B.
  • the width B of the strip 12 can be modified by simply varying the angle ⁇ of inclination of the cutting propeller, that is to say the orientation of the disc 10 and the rollers 9, as well as the speed tube rotation 11.
  • the extraction speed of the tube was 0.5 m / s.
  • the strips obtained had a very fine solidification structure and homogeneous properties throughout their section. Their width was constant, and their edges were regular and without defects.
  • the method of the invention offers great flexibility of conduct, because of the ease with which it is possible to modify the width and the thickness of the metal strips produced.
  • the strips produced do not have any profile and flatness defects, which are common and difficult to avoid in the other processes.
  • Figure II illustrates the particular embodiment of the device of the invention, in which the first section of the mold has a frustoconical shape.
  • This figure shows a nozzle 1, fitted to a casting container, not shown, the end of which is introduced into a first section H1 of the casting mold.
  • This first section H1 consists of an element frustoconical 3 in copper, the section of which increases towards the second section H2.
  • the frustoconical element 3 is equipped with means, known per se and not shown, on the one hand to rotate it around its longitudinal axis and on the other hand to ensure its cooling.
  • the nozzle 1 has a closed end, and two lateral outlet conduits 14, inclined downwards in the direction of the internal wall of the frustoconical element 3.
  • the diameter of the outlet section of the frustoconical element 3 is slightly less than the diameter of the inlet section of the second section H2 of the casting mold.
  • the second section H2 of the casting mold and the cooling system H3 conform to those of the device shown in Figure I and described above.
  • This modality of the device of the invention operates as follows.
  • the pasty metal then enters the second section H2 of the mold, then in the cooling system H3, as described in the document cited in the introduction.
  • a frustoconical section H1 having a length of 0.35 m, an outlet section of 0.15 m in diameter and an opening angle of 30 °.
  • a steel having an initial overheating of 25 ° C. was poured, with a flow rate of 20 t / h; the frusto-conical element rotated at a speed of 1100 rpm. Under these conditions, the speed of the steel film at the outlet of the frustoconical element was 10 m / s and the solid fraction in the steel reached 30% there.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Claims (10)

1. Einrichtung zur kontinuierlichen Herstellung eines dünnen Metallstreifens aus einem geschmolzenen Metall, die eine rohrförmige Form zur Bildung einer Metallschicht an der Formwand entlang umfaßt, mit Kühlungsmitteln, in denen jene Metallschicht einer Kühlung unterzogen wird, durch die jenes Metall völlig zu einem festen Rohr erstarrt, und mit einem Apparat, mit dem jenes Rohr entlang einer schraubenförmigen Linie geschnitten werden kann, dadurch gekennzeichnet, daß jene Form in vertikaler Lage montiert ist und daß sie mindestens zwei aufeinanderfolgende Abschnitte (H1; H2; H3) umfaßt, in denen das Metall dazu gezwungen wird, als dünnes Blatt (15) unter einer kreisenden Bewegung an der Wand entlang im Innern der Form nach unten zu strömen.
2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der erste jener Abschnitte Mittel (2) zur Verteilung des geschmolzenen Metalls über die Innenwand jener Form umfaßt.
3. Einrichtung nach Anspruch 2, dadurch gekennzeichnet, daß jene Mittel zur Verteilung des geschmolzenen Metalls über die Innenwand jener Form eine Düse mit geschlossenem Ende (14) umfassen, die einen oder mehrere seitliche Auslaßkanäle für das geschmolzene Metall aufweist.
4. Einrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß mindestens der zweite (H1) jener Abschnitte sich an seine Längsachse drehen kann.
5. Einrichtung nach Anspruch 4, dadurch gekennzeichnet, daß der erste jener Abschnitte Mittel (4) umfaßt, mit denen dem geschmolzenen Metall eine kreisende Bewegung an dessen Innenwand entlang verliehen wird.
6. Einrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß mindestens einer jener Abschnitte jener Form mit Kühlungsmitteln (6) ausgestattet ist, damit jenes Metall teilweise erstarrt.
7. Einrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der erste jener Abschnitte einen inneren Querschnitt aufweist, der sich in Fortbewegungsrichtung des Metalls durch jenen ersten Abschnitt vergrößert.
8. Einrichtung nach Anspruch 7, dadurch gekennzeichnet, daß sich jener innere Querschnitt gemäß einer Gesetzmäßigkeit vergrößert, die jenem ersten Abschnitt über einen entsprechenden Teil seiner Länge ein parabolisches Innenprofil verleiht.
9. Einrichtung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß jener Schneideapparat Mitnahmerollen (9), die jenes Metallrohr in Drehung versetzen und in Axialrichtung fortbewegen, sowie mindestens ein Schneidwerkzeug (10) umfaßt, das so ausgerichtet ist, daß es jenen Schnitt entlang der gewünschten schraubenförmigen Linie ausführt.
10. Einrichtung nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß sie Mittel (13) zur Einführung eines Schutzgases in das Innere jenes erstarrten Metallrohres umfaßt.
EP19880870083 1987-05-08 1988-05-06 Vorrichtung zur kontinuierlichen Herstellung eines dünnen Metallbands Expired - Lifetime EP0290423B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88870083T ATE78733T1 (de) 1987-05-08 1988-05-06 Vorrichtung zur kontinuierlichen herstellung eines duennen metallbands.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
BE8700525A BE1000528A6 (fr) 1987-05-08 1987-05-08 Procede et dispositif de fabrication en continu d'une bande metallique mince.
BE8700525 1987-05-08
BE8701460 1987-12-17
BE8701460A BE1001298A6 (fr) 1987-12-17 1987-12-17 Dispositif de fabrication en continu d'une bande metallique mince.

Publications (3)

Publication Number Publication Date
EP0290423A2 EP0290423A2 (de) 1988-11-09
EP0290423A3 EP0290423A3 (en) 1989-10-18
EP0290423B1 true EP0290423B1 (de) 1992-07-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880870083 Expired - Lifetime EP0290423B1 (de) 1987-05-08 1988-05-06 Vorrichtung zur kontinuierlichen Herstellung eines dünnen Metallbands

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EP (1) EP0290423B1 (de)
DE (1) DE3873158D1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU87074A1 (de) * 1987-12-15 1989-07-07 Centrem Sa Verfahren und vorrichtung zur kontinuierlichen herstellung von metallprodukten

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE546497A (de) *
US2477030A (en) * 1947-07-24 1949-07-26 Fred H Wuetig Centrifugal strip casting machine
JPS60261654A (ja) * 1984-06-07 1985-12-24 Ishikawajima Harima Heavy Ind Co Ltd 帯板鋳造装置
US4573523A (en) * 1984-11-05 1986-03-04 Hatch Associates Ltd. Method of and apparatus for continuous centrifugal casting

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Publication number Publication date
EP0290423A2 (de) 1988-11-09
EP0290423A3 (en) 1989-10-18
DE3873158D1 (de) 1992-09-03

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