EP2991789B1 - Immersion pipe for producing cast metal strand parts, and strand casting method - Google Patents

Immersion pipe for producing cast metal strand parts, and strand casting method Download PDF

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Publication number
EP2991789B1
EP2991789B1 EP13719262.1A EP13719262A EP2991789B1 EP 2991789 B1 EP2991789 B1 EP 2991789B1 EP 13719262 A EP13719262 A EP 13719262A EP 2991789 B1 EP2991789 B1 EP 2991789B1
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EP
European Patent Office
Prior art keywords
bell
immersion tube
refractory mantle
immersion
dip tube
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EP13719262.1A
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German (de)
French (fr)
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EP2991789A1 (en
Inventor
Edgar Schumacher
Renata Franzky
Rudolf Köhl
Hubert Brenner
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Techcom GmbH
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Techcom GmbH
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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

Definitions

  • the present invention relates to a dip tube for continuous casting plants for the production of metallic castings in forms, in particular with the lower part of the dip tube, which is surrounded by a bell-shaped jacket.
  • Such a device is known in the art both from EP 1 854 571 A1 as well as from the EP 2 172 290 A1 known.
  • These documents show a dip tube for continuous casting plants for the casting of liquid metal, eg. As steel, consisting of at least two parts, in the end region at least one outlet opening is arranged. Around the outlet opening a bell-shaped refractory shell is permanently attached to the surface in the lower part of the dip tube.
  • a dip tube known.
  • This document discloses, inter alia, a one-piece underwater nozzle, which is surrounded in the lower part of an oval skirt, which has two plane-parallel walls and is firmly connected to the supply pipe of the nozzle.
  • the liquid metal emerging from the nozzle flows in a laminar flow at a predetermined angle and spreads in the mold provided.
  • a pouring tube with a closed bottom and opposed openings has become known, in which the lower part of the pouring tube is surrounded by four substantially flat deflection surfaces which are integrally connected to the Gellorohrunterteil.
  • the front-side deflection surfaces serve to trap the kinetic energy of the outflowing liquid metal and lead to turbulence within the flow of the liquid metal.
  • casting molds are frequently requested for which the cross-section of the casting mold does not have to be round or oval, but polygonal, in order to have a reference edge or corner, which is important for the further processing of the blank.
  • the immersion tube for continuous casting plants for casting liquid metal in molds consisting of at least two parts, in whose end region at least one outlet opening is arranged, characterized in that in the end region of the dip tube, a bell-like refractory shell is arranged, which is releasably attached to the surface in lower portion of the dip tube is attached.
  • the inventive method for continuous casting of liquid metal for. As steel in a mold with a dip tube, which is surrounded in the lower part of a bell-shaped jacket, is characterized in that the prefabricated bell-shaped jacket is releasably secured only at the place of use at the bottom of the dip tube.
  • the bell-shaped shell in the contact region to the liquid metal surface has a layer whose material is resistant to covering powder on the surface of the liquid metal.
  • At least the lower part of the bell-shaped shell is formed in cross section in different shapes, e.g. round, oval or polygonal.
  • the bell-shaped jacket has at least one bore at a predetermined location.
  • a further advantage resides in the fact that at least one outlet opening is arranged in the end region of the dip tube, whose center axis encloses a predetermined acute angle ( ⁇ ) with the lateral surface of the bell-shaped jacket, the values for the angle ⁇ being between approximately 10 ° and 80 °, preferably between about 20 ° and 45 °.
  • the central bore of the bell-shaped shell which accommodates the lower part of the dip tube, has means for fixing the bell-shaped shell, e.g. a thread or a predetermined roughness to increase the friction or for receiving an adhesive or a mortar or elongated slots with or without a bayonet closure seconded at a suitable location.
  • the central bore in the bell-shaped shell is conically shaped at least in a partial region.
  • At least the surface of the bell-shaped shell comprises a material containing, for example, about 59% AL203 and about 10% SiO 2 and about 29% C.
  • At least the surface of the bell-shaped shell comprises a material, e.g. about 79% Zr02 and about 4.5% Si02 and about 29% C includes.
  • the at least one outlet opening in the lower region of the dip tube is slightly conical, with the larger diameter (D) of the outlet opening facing outward.
  • the bottom has at least one bore at the end of the dip tube.
  • the Fig. 1 shows a cross section through the lower part 2 of the dip tube 1, which has at least one lateral outlet opening 3 in the end and a further bore 4 in the bottom of the dip tube 1.
  • the lower portion of the dip tube 1 is surrounded by a bell-shaped jacket 5, which is mounted and secured only at the point of use.
  • the liquid metal flows through the tube 6 and exits through the lateral outlet openings 3, as well as through the at least one lower outlet opening 4 in the bottom of the dip tube 1 in a laminar flow and first strikes the inner walls 7 of the bell-shaped shell 5, then to in the appropriate mold.
  • the intrinsic kinetic energy of the liquid metal is converted into a type of rotational energy which only becomes completely zero during the solidification process of the metal.
  • the overlying part 2 extends with a conical surface 8, which has predetermined fastening means, which are further explained below.
  • the lateral surface 8 at the upper end has an edge with a shoulder 9 which is frictionally and positively engaged with the upper end of the jacket 5.
  • the Fig. 2 shows a cross section along the section line A - A perpendicular to the central axis of the dip tube 1.
  • a bore 4 which essentially serves to equalize the pressure on the bottom of the dip tube 1 in the continuous casting process.
  • Tangential to the bore 6 of the dip tube 1 extend in the present embodiment with a side 10, 10 ', 10 "star-shaped three conical outlet openings 3, 3'3", whose central axes 11, 11 ', 11 "are rotated by 120 ° Graduations are also depending on the application and the type the shape, as well as the metal possible.
  • the position of the outlet openings 3, 3 ', 3 "plays only a minor role because of the rotational symmetry of the casting mold and the jacket 5.
  • the number of outlet openings and the shape of the bell-shaped shell 5 are to vary according to the number of sides to ensure a laminar flow of the outflowing liquid metal It is important that the angle between the central axis 11 of the outlet opening 3 and the surface of the shell wall, on which the liquid metal impinges, is an acute angle.
  • the Fig. 3 shows the lower part 2 'of the dip tube 1 in cross section, whose view by 90 ° relative to the sectional view Fig. 2 is turned. It can be seen from this illustration that the cross-section of the outlet openings 3, 3 'is not round, but rather rectangular, with at least one edge being rounded. Furthermore, the diameters of the outlet openings 3, 3 ', 3 "widen in the flow direction.
  • the bore 4 in the bottom of the dip tube 1 is also conical, the diameter increasing in the flow direction.
  • the Fig. 4 shows a schematic sectional view of an embodiment of the refractory bell-shaped shell 5 of the present invention.
  • the refractory and heat-resistant bell-shaped shell 5 is at least partially made of a material such as Al 2 O 3 (59.113%) Al 2 O 3 (59.113%) and SiO 2 (10.327%), and C (29.02%) carbon as essential constituents.
  • This composition has a density of 2.416 g / cm3 and a porosity of 19.2 vol% and a modulus of rupture of 8.7 N / mm2.
  • Another material could also be a composition of ZrO 2 (79.253%) SiO 2 (4.558%) and C (15.56%).
  • This composition has a density of 3.663 g / cm 3 and a porosity of 14.4 vol% and a modulus of rupture of 10.9 N / mm 2.
  • a cover powder at least the outer walls of the shell 5, a layer 12 which is chemically resistant to the cover powder used.
  • Layer 12 can be applied in the form of a thin glaze of different composition depending on the requirement profile.
  • the upper part 13 of the bell-shaped jacket 5 is shaped trapezoidal in its outer shape and has centrally a conical bore 14 for receiving the dip tube 1.
  • the side walls 15 of the substantially conical bore 14 serve to attach the bell-shaped shell 5 to the outer surface 8 of the dip tube 1.
  • the outer surfaces 8 of the dip tube 1 and the outer surfaces of the side walls 15 of the conical bore 14 are adapted to each other so that they have a releasable connection form.
  • a simple embodiment of the detachable connection between the dip tube 1 and the bell-shaped jacket 5 is to be seen in that at least the surfaces of the walls are coated with a 2 mm thick ceramic layer 16,16 'whose roughness is determined so that only the friction between makes the walls a sufficient connection.
  • Another releasable connection is a thread that is incorporated both on the outer wall of the dip tube 1 in the region of contact and in the inner walls 15 of the conical bore 14 of the jacket 5.
  • Another fastener is made with grooves in the sidewalls 15 of the conical bore 14 and mating studs on the outer wall of the dip tube 1 with a lateral, 90 ° rotated groove in the wall 15 as a securing at a convenient location, with a pin - Not shown here - is in operative connection, so that a secure releasable connection between the two surfaces is made.
  • the upper end face 17 of the bell-shaped shell 5 is formed in the present embodiment as a flat surface which is positively and positively in operative connection with the recessed paragraph 9 in the dip tube 1.
  • the lower, substantially cylindrical part 18 of the bell-shaped shell 5 adjoins the upper trapezoidal part 13 and can optionally be made separately, so that the bell-shaped shell 5 is formed at least in two parts and is fastened to the parting line 19 with a corresponding connection mechanism.
  • a particularly important feature for the life of the bell-shaped shell 5 is at least one opening or bore 20 which completely penetrates the shell wall, wherein the longitudinal cross-sectional shape is freely selectable, eg cylindrical or conical.
  • the height of the central axis of the bore depends primarily on the seat of the outlet openings 3, 3 ', 3 "in the dip tube 1.
  • the Fig. 5 shows a schematic plan view of three typical cross-sectional shapes a) - c) of a mold 21 or mold into which the liquid metal is introduced.
  • the outer shape of the bell-shaped shell 5 depends essentially on the mold 21, 21 ', 21 "with walls 22, 22', 22", so that at the outlet of the liquid metal, if possible, a uniform propagation velocity is achieved at all points of the mold, which then ensures little turbulence in the flow.
  • a dip tube 1 is presented for the continuous casting of liquid metals, which is surrounded in the lower part of a releasably secured refractory bell-shaped jacket 5.
  • the detachable connection 16 of the bell-shaped shell 5 on the surface of the lower part 2 of the dip tube 1 can be effected by various technical means in various ways, for. B. by means of a thread or a simple plug connection.
  • the outer shape of the bell-shaped shell 5 is arbitrary, z. B. round, oval or polygonal and depends on the nature of the application.

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

Description

Die vorliegende Erfindung befasst sich mit einem Tauchrohr für Stranggussanlagen zur Herstellung von metallischen Gussteilen in Formen, insbesondere mit dem unteren Teil des Tauchrohres, der von einem glockenartigen Mantel umgeben ist.The present invention relates to a dip tube for continuous casting plants for the production of metallic castings in forms, in particular with the lower part of the dip tube, which is surrounded by a bell-shaped jacket.

Eine derartige Vorrichtung ist im Stand der Technik sowohl aus der EP 1 854 571 A1 als auch aus der EP 2 172 290 A1 bekannt. Diese Druckschriften zeigen ein Tauchrohr für Stranggussanlagen zum Gießen von flüssigem Metall, z. B. Stahl, bestehend aus mindestens zwei Teilen, in deren Endbereich mindestens eine Auslassöffnung angeordnet ist. Um die Auslassöffnung ist ein glockenartiger feuerfester Mantel unlösbar an der Oberfläche im unteren Bereich des Tauchrohres befestigt.Such a device is known in the art both from EP 1 854 571 A1 as well as from the EP 2 172 290 A1 known. These documents show a dip tube for continuous casting plants for the casting of liquid metal, eg. As steel, consisting of at least two parts, in the end region at least one outlet opening is arranged. Around the outlet opening a bell-shaped refractory shell is permanently attached to the surface in the lower part of the dip tube.

Ferner ist im Stand der Technik aus der RU 2359782 C2 ein Tauchrohr bekannt. Diese Druckschrift offenbart u.a. eine einteilige Unterwasserdüse, die im unteren Bereich von einer ovalen Schürze umgeben ist, die zwei planparallele Wände aufweist und mit dem Zuführungsrohr der Düse fest verbunden ist. Das aus der Düse austretende flüssige Metall fließt in einer laminaren Strömung unter einem vorgegeben Winkel aus und breitet sich in der vorgesehenen Kokille aus.Furthermore, in the prior art from the RU 2359782 C2 a dip tube known. This document discloses, inter alia, a one-piece underwater nozzle, which is surrounded in the lower part of an oval skirt, which has two plane-parallel walls and is firmly connected to the supply pipe of the nozzle. The liquid metal emerging from the nozzle flows in a laminar flow at a predetermined angle and spreads in the mold provided.

Ferner ist aus der DE 24 42 915 ein Gießrohr mit geschlossenem Boden und einander gegenüber liegenden Öffnungen bekannt geworden, bei dem der untere Teil des Gießrohres von vier im Wesentlichen ebenen Umlenkflächen umgeben ist, die integral mit dem Gießrohrunterteil zusammenhängen. Die stirnseitigen Umlenkflächen dienen zum Abfangen der kinetischen Energie des ausströmenden flüssigen Metalls und führen zu Verwirbelungen innerhalb der Strömung des flüssigen Metalls.Furthermore, from the DE 24 42 915 a pouring tube with a closed bottom and opposed openings has become known, in which the lower part of the pouring tube is surrounded by four substantially flat deflection surfaces which are integrally connected to the Gießrohrunterteil. The front-side deflection surfaces serve to trap the kinetic energy of the outflowing liquid metal and lead to turbulence within the flow of the liquid metal.

Weiterhin ist aus der RU 2 236 326 C2 ein Tauchrohr mit einer am Ende des Tauchrohres angeordneten Düse zu entnehmen, die von einer untrennbaren, mit dem Ende des Tauchrohres verbundenen Glocke umgeben ist.Furthermore, from the RU 2 236 326 C2 to take a dip tube with a arranged at the end of the dip tube nozzle, which is surrounded by an inseparable, connected to the end of the dip tube bell.

Diese bekannte Ausführungsform eines Tauchrohres mit einer Düse mit einer festen Schürze hat den Nachteil, dass die Schürze unlösbar mit dem Tauchrohr und der Düse verbunden ist und somit nicht separat geliefert oder transportiert werden kann, so dass nicht die Möglichkeit besteht, die Schürze bzw. den glockenartigen Mantel bei Bedarf auszuwechseln. In der Herstellung bei deren Produktion (Schürze) ist ein presstechnischer Mehraufwand von Nöten und bindet die Anwender an die Produktionsmöglichkeiten eines Herstellers. Die wesentlich einfachere Presstechnologie für die mindestens zweigeteilte Ausführung eröffnet dem Endanwender die Freiheit in der Wahl des Produzenten für derartige feuerfeste glockenartige Mäntel.This known embodiment of a dip tube with a nozzle with a fixed skirt has the disadvantage that the skirt is permanently connected to the dip tube and the nozzle and thus can not be supplied separately or transported, so that there is no possibility of the skirt or the replace bell-shaped sheath if necessary. In the production of their production (apron) is a prespecification of additional costs and binds the user to the production capabilities of a manufacturer. The much simpler press technology for the at least two-part design gives the end user the freedom to choose the manufacturer for such refractory bell-shaped coats.

Das Risiko, die Schürze beim Transport des kompletten Tauchrohres mit befestigter Schürze zu beschädigen, ist nicht gering und kann nur mit großem technischen Aufwand repariert und wieder gebrauchsfertig gemacht werden, so dass es allein aus diesem Grunde sinnvoll erscheint, die Schürze am Tauchrohr lösbar zu befestigen, um die beiden Teile einzeln zu transportieren und in den Verkehr zu bringen.The risk of damaging the apron when transporting the entire dip tube with attached apron, is not low and can only be repaired with great technical effort and made ready for use again, so that it seems sensible for this reason alone to attach the apron to the dip tube to transport the two parts individually and place them on the market.

Ein weiterer Nachteil wird darin gesehen, dass es in bestimmten Anwendungsfällen für bestimmte Metalle vorteilhaft ist, den Gießvorgang in die dafür vorgesehenen Formen ohne die Schürze durchzuführen, da für bestimmte Stahl/Metallsorten der Reinheitsgrad für den Guss mit herkömmlichen Tauchrohren ausreicht. Dies bringt zusätzlich einen wirtschaftlichen Vorteil, da durch die zwei oder mehrteilige Ausführung der Schürze ein Anpassen an die erforderlichen Stahl/Metallgüte, vor Ort durch Befestigen oder Weglassen der Schürze, erreicht wird.Another disadvantage is seen in the fact that it is advantageous in certain applications for certain metals, the casting process in the molds intended for this purpose without the apron, since for certain types of steel / metal, the degree of purity is sufficient for casting with conventional immersion tubes. This also brings an economic advantage, since the two or more parts design of the apron, an adaptation to the required steel / metal grade, locally by attaching or omitting the skirt is achieved.

Ferner werden häufig Gussformen gefragt, für die der Querschnitt der Gussform weder rund noch oval, sondern mehreckig sein muss, um dadurch eine Referenzkante oder Ecke zu haben, was für die Weiterverarbeitung des Rohlings von Bedeutung ist.Furthermore, casting molds are frequently requested for which the cross-section of the casting mold does not have to be round or oval, but polygonal, in order to have a reference edge or corner, which is important for the further processing of the blank.

Daher ist es Aufgabe der vorliegenden Erfindung, eine Vorrichtung zur Herstellung von metallischen Stranggussteilen bereitzustellen, die in der Lage ist, die Nachteile aus dem Stand der Technik zu beseitigen, einfach und kostengünstig in der Herstellung ist und eine verbesserte Standzeit gewährleistet.It is therefore an object of the present invention to provide an apparatus for the production of continuous metal castings, which is able to eliminate the disadvantages of the prior art, is simple and inexpensive to manufacture and ensures an improved service life.

Diese Aufgabe wird mit den kennzeichnenden Merkmalen der Hauptansprüche gelöst. Weitere erfindungsgemäße Merkmale sind den Unteransprüchen und der Beschreibung zu entnehmen.This object is achieved with the characterizing features of the main claims. Further features according to the invention can be taken from the subclaims and the description.

Erfindungsgemäß ist das Tauchrohr für Stranggussanlagen zum Gießen von flüssigem Metall in Formen, bestehend aus mindestens zwei Teilen, in deren Endbereich mindestens eine Auslassöffnung angeordnet ist, dadurch gekennzeichnet, dass im Endbereich des Tauchrohres ein glockenartiger feuerfester Mantel angeordnet ist, der lösbar an der Oberfläche im unteren Bereich des Tauchrohres befestigt ist. Das erfindungsgemäße Verfahren zum Stranggießen von flüssigem Metall, z. B. Stahl in eine Gussform mit einem Tauchrohr, das im unteren Bereich von einem glockenartigen Mantel umgeben ist, ist dadurch gekennzeichnet, dass der vorgefertigte glockenförmige Mantel erst am Einsatzort am unteren Bereich des Tauchrohres lösbar befestigt wird.According to the invention, the immersion tube for continuous casting plants for casting liquid metal in molds consisting of at least two parts, in whose end region at least one outlet opening is arranged, characterized in that in the end region of the dip tube, a bell-like refractory shell is arranged, which is releasably attached to the surface in lower portion of the dip tube is attached. The inventive method for continuous casting of liquid metal, for. As steel in a mold with a dip tube, which is surrounded in the lower part of a bell-shaped jacket, is characterized in that the prefabricated bell-shaped jacket is releasably secured only at the place of use at the bottom of the dip tube.

Dabei ist es auch vorteilhaft, dass der glockenartige Mantel im Berührungsbereich zur flüssigen Metalloberfläche eine Schicht aufweist, dessen Material resistent gegen Abdeckpulver auf der Oberfläche des flüssigen Metalls ist.It is also advantageous that the bell-shaped shell in the contact region to the liquid metal surface has a layer whose material is resistant to covering powder on the surface of the liquid metal.

Vorteilhaft ist es ferner, dass zumindest der untere Teil des glockenartigen Mantels im Querschnitt in verschiedenen Formen ausgebildet ist, z.B. rund, oval oder mehreckig.It is also advantageous that at least the lower part of the bell-shaped shell is formed in cross section in different shapes, e.g. round, oval or polygonal.

Ferner ist es vorteilhaft, dass der glockenartige Mantel an vorbestimmter Stelle mindestens eine Bohrung aufweist.Furthermore, it is advantageous that the bell-shaped jacket has at least one bore at a predetermined location.

Ein weiterer Vorteil wird darin gesehen, dass im Endbereich des Tauchrohres mindestens eine Auslassöffnung angeordnet ist, deren Mittelachse einen vorbestimmten spitzen Winkel (α) mit der Mantelfläche des glockenartigen Mantels einschließt, wobei die Werte für den Winkel α zwischen etwa 10° und 80°, vorzugsweise zwischen etwa 20° und 45° liegen.A further advantage resides in the fact that at least one outlet opening is arranged in the end region of the dip tube, whose center axis encloses a predetermined acute angle (α) with the lateral surface of the bell-shaped jacket, the values for the angle α being between approximately 10 ° and 80 °, preferably between about 20 ° and 45 °.

Vorteilhaft ist es auch, dass die Mittelbohrung des glockenförmigen Mantels, die den unteren Teil des Tauchrohres aufnimmt, Mittel zur Befestigung des glockenartigen Mantels aufweist, z.B. ein Gewinde oder eine vorbestimmte Rauhigkeit zur Vergrößerung der Reibung oder zur Aufnahme eines Klebers oder eines Mörtels oder längliche Schlitze mit oder ohne an geeigneter Stelle abgeordneten Bajonettverschluss.It is also advantageous that the central bore of the bell-shaped shell, which accommodates the lower part of the dip tube, has means for fixing the bell-shaped shell, e.g. a thread or a predetermined roughness to increase the friction or for receiving an adhesive or a mortar or elongated slots with or without a bayonet closure seconded at a suitable location.

Vorteilhaft ist es ferner, dass die Mittelbohrung in dem glockenartigen Mantel mindestens in einem Teilbereich konisch ausgeformt ist.It is also advantageous that the central bore in the bell-shaped shell is conically shaped at least in a partial region.

Ein weiterer Vorteil besteht darin, dass zumindest die Oberfläche des glockenförmigen Mantels ein Material aufweist, das z.B. ca. 59% AL203 und ca. 10% Si02 und ca. 29% C beinhaltet.Another advantage is that at least the surface of the bell-shaped shell comprises a material containing, for example, about 59% AL203 and about 10% SiO 2 and about 29% C.

Ferner ist es vorteilhaft, dass zumindest die Oberfläche des glockenförmigen Mantels ein Material aufweist, das z.B. ca. 79% Zr02 und ca. 4,5% Si02 und ca. 29% C beinhaltet.Furthermore, it is advantageous that at least the surface of the bell-shaped shell comprises a material, e.g. about 79% Zr02 and about 4.5% Si02 and about 29% C includes.

Vorteilhaft ist es auch, dass die mindestens eine Auslassöffnung im unteren Bereich des Tauchrohres leicht konisch ausgebildet ist, wobei der größere Durchmesser (D) der Auslassöffnung nach außen weist.It is also advantageous that the at least one outlet opening in the lower region of the dip tube is slightly conical, with the larger diameter (D) of the outlet opening facing outward.

Ein weiterer Vorteil besteht darin, dass der Boden am Ende des Tauchrohres mindestens eine Bohrung aufweist.Another advantage is that the bottom has at least one bore at the end of the dip tube.

Im nun Folgenden wird die Erfindung anhand von Zeichnungen näher erläutert. Es zeigt

Fig. 1:
einen Querschnitt des unteren Teils (2, 2') des Tauchrohres (1) mit einem glockenartigen Mantel (5);
Fig. 2:
einen Querschnitt entlang der Schnittlinie A - A im unteren Bereich (2) des Tauchrohres (1) aus Fig. 1;
Fig. 3:
einen Querschnitt durch den unteren Bereich (2, 2') des Tauchrohres (1) senkrecht zur Schnittlinie A - A mit mindestens einer Auslassöffnungen (3);
Fig. 4:
eine schematische Querschnittsdarstellung durch den glockenartigen Mantel (5);
Fig. 5:
die schematische Draufsicht auf drei verschiedene Gussformen 21, 21', 21" bzw. Kokillen, in die das Tauchrohr (1) eingesetzt wird.
In the following, the invention will be explained in more detail with reference to drawings. It shows
Fig. 1:
a cross-section of the lower part (2, 2 ') of the dip tube (1) with a bell-shaped jacket (5);
Fig. 2:
a cross section along the section line A - A in the lower region (2) of the dip tube (1) Fig. 1 ;
3:
a cross section through the lower portion (2, 2 ') of the dip tube (1) perpendicular to the section line A - A with at least one outlet openings (3);
4:
a schematic cross-sectional view through the bell-shaped shell (5);
Fig. 5:
the schematic plan view of three different molds 21, 21 ', 21 "or molds, in which the dip tube (1) is used.

Die Fig. 1 zeigt einen Querschnitt durch den unteren Teil 2 des Tauchrohres 1, das im Endbereich mindestens eine seitliche Auslassöffnung 3 und im Boden des Tauchrohres 1 eine weitere Bohrung 4 aufweist. Der untere Bereich des Tauchrohres 1 ist von einem glockenartigen Mantel 5 umgeben, der erst am Gebrauchsort aufmontiert und befestigt wird. Beim Gießen eines Gussteiles wird das Ende des Tauchrohres 1 mit dem montierten glockenförmigen Mantel 5 in eine Gießform - hier nicht gezeigt - eingeführt und das flüssige Metall im bekannten Stranggießverfahren in die Form eingeleitet. Dabei strömt das flüssige Metall durch die Röhre 6 und tritt durch die seitlichen Auslassöffnungen 3, sowie durch die mindestens eine untere Auslassöffnung 4 im Boden des Tauchrohres 1 in einer laminaren Strömung aus und trifft zunächst auf die Innenwände 7 des glockenförmigen Mantels 5, um sich dann in der entsprechenden Gussform auszubreiten. Bei diesem Austrittsprozess des flüssigen Metalls wird die immanente kinetische Energie des flüssigen Metalls infolge der besonderen Stellung der Auslassdüsen 3 in eine Art Rotationsenergie umwandelt, die erst im Laufe des Erstarrungsprozesses des Metalls vollständig zu Null wird. Während der untere Teil 2' am Ende des Tauchrohres 1 eher eine zylindrische Mantelfläche aufweist, erstreckt sich der darüber liegende Teil 2 mit einer konusförmigen Mantelfläche 8, die vorbestimmte Befestigungsmittel aufweist, die weiter unter näher erläutert werden. Um die Auftriebskräfte, die auf den glockenförmigen Mantel 5 während des Gießprozesses einwirken, abzufangen, weist die Mantelfläche 8 am oberen Ende eine Kante mit einem Absatz 9 auf, der mit dem oberen Ende des Mantels 5 kraft- und formschlüssig in Wirkverbindung steht.The Fig. 1 shows a cross section through the lower part 2 of the dip tube 1, which has at least one lateral outlet opening 3 in the end and a further bore 4 in the bottom of the dip tube 1. The lower portion of the dip tube 1 is surrounded by a bell-shaped jacket 5, which is mounted and secured only at the point of use. When casting a casting, the end of the dip tube 1 with the assembled bell-shaped shell 5 in a mold - not shown here - introduced and introduced the liquid metal in the known continuous casting in the mold. In this case, the liquid metal flows through the tube 6 and exits through the lateral outlet openings 3, as well as through the at least one lower outlet opening 4 in the bottom of the dip tube 1 in a laminar flow and first strikes the inner walls 7 of the bell-shaped shell 5, then to in the appropriate mold. In this liquid metal exit process, due to the particular position of the discharge nozzles 3, the intrinsic kinetic energy of the liquid metal is converted into a type of rotational energy which only becomes completely zero during the solidification process of the metal. While the lower part 2 'at the end of the dip tube 1 has more of a cylindrical surface, the overlying part 2 extends with a conical surface 8, which has predetermined fastening means, which are further explained below. In order to absorb the buoyancy forces which act on the bell-shaped jacket 5 during the casting process, the lateral surface 8 at the upper end has an edge with a shoulder 9 which is frictionally and positively engaged with the upper end of the jacket 5.

Die Fig. 2 zeigt einen Querschnitt entlang der Schnittlinie A - A senkrecht zur Mittelachse des Tauchrohres 1. In dieser Draufsicht auf die Schnittfläche ist mittig im Boden des Tauchrohres 1 eine Bohrung 4 angeordnet, die im Wesentlichen dem Druckausgleich auf den Boden des Tauchrohre 1 beim Stranggussvorgang dient. Tangential an die Bohrung 6 des Tauchrohres 1 erstrecken sich im vorliegenden Ausführungsbeispiel mit einer Seite 10, 10', 10" sternförmig drei konische Austrittsöffnungen 3, 3' 3", deren Mittelachsen 11, 11', 11" um 120° gedreht sind. Andere Gradteilungen sind ebenfalls je nach Anwendungsfall und Art der Form, sowie des Metalls möglich. Bei einer runden Gießform oder Kokille - die hier nicht gezeigt sind - sowie eines runden glockenförmigen Mantels 5 spielt die Stellung der Auslassöffnungen 3, 3', 3" wegen der Rotationssymmetrie der Gießform und des Mantels 5 nur eine untergeordnete Rolle. Bei einer ovalen Gießform bzw. Mantels sind dagegen nur zwei sich gegenüber stehende Auslassöffnungen 3, 3' erforderlich, und bei mehreckigen Gießformen sind entsprechend der Anzahl der Seiten die Anzahl der Auslassöffnungen und die Form des glockenförmigen Mantels 5 zu variieren, um eine laminare Strömung des ausströmenden flüssigen Metalls zu gewährleisten. Wichtig ist, dass der Winkel zwischen der Mittelachse 11 der Auslassöffnung 3 und der Fläche der Mantelwand, auf die das flüssige Metall auftrifft, ein spitzer Winkel ist.The Fig. 2 shows a cross section along the section line A - A perpendicular to the central axis of the dip tube 1. In this plan view of the cutting surface is centrally located in the bottom of the dip tube 1 a bore 4, which essentially serves to equalize the pressure on the bottom of the dip tube 1 in the continuous casting process. Tangential to the bore 6 of the dip tube 1 extend in the present embodiment with a side 10, 10 ', 10 "star-shaped three conical outlet openings 3, 3'3", whose central axes 11, 11 ', 11 "are rotated by 120 ° Graduations are also depending on the application and the type the shape, as well as the metal possible. In the case of a round casting mold or mold - which are not shown here - and a round bell-shaped jacket 5, the position of the outlet openings 3, 3 ', 3 "plays only a minor role because of the rotational symmetry of the casting mold and the jacket 5. In the case of an oval casting mold or mold Mantels on the other hand only two opposing outlet ports 3, 3 'required, and in polygonal molds, the number of outlet openings and the shape of the bell-shaped shell 5 are to vary according to the number of sides to ensure a laminar flow of the outflowing liquid metal It is important that the angle between the central axis 11 of the outlet opening 3 and the surface of the shell wall, on which the liquid metal impinges, is an acute angle.

Die Fig. 3 zeigt den unteren Teil 2' des Tauchrohres 1 im Querschnitt, dessen Ansicht um 90° gegenüber der Schnittdarstellung aus Fig. 2 gedreht ist. Aus dieser Darstellung ist ersichtlich, das der Querschnitt der Auslassöffnungen 3, 3' nicht rund, sondern eher rechteckig ist, wobei mindestens eine Kante abgerundet ist. Ferner verbreitern sich die Durchmesser der Auslassöffnungen 3, 3', 3" in Strömungsrichtung. Die Bohrung 4 im Boden des Tauchrohres 1 ist ebenfalls konisch ausgebildet, wobei sich der Durchmesser in Strömungsrichtung vergrößert.The Fig. 3 shows the lower part 2 'of the dip tube 1 in cross section, whose view by 90 ° relative to the sectional view Fig. 2 is turned. It can be seen from this illustration that the cross-section of the outlet openings 3, 3 'is not round, but rather rectangular, with at least one edge being rounded. Furthermore, the diameters of the outlet openings 3, 3 ', 3 "widen in the flow direction. The bore 4 in the bottom of the dip tube 1 is also conical, the diameter increasing in the flow direction.

Die Fig. 4 zeigt eine schematische Schnittdarstellung einer Ausführungsform des feuerfesten glockenartigen Mantels 5 der vorliegenden Erfindung. Der feuer- und hitzebeständige glockenartige Mantel 5 besteht zumindest teilweise aus einem Material, wie beispielsweise Al2O3 (59,113 %) Al2O3 (59,113 %) und Si02 (10,327%), sowie C (29,02%) Kohlenstoff als wesentliche Bestandteile beinhaltet. Diese Zusammensetzung weist eine Dichte von 2,416 g/cm3 und eine Porosität von 19,2 vol% sowie einem Bruchmodul von 8,7 N/mm2 auf. Ein weiteres Material könnte auch eine Zusammensetzung aus Zr02 (79,253%) Si02 (4,558%) und C (15,56%) sein. Diese Zusammensetzung weist eine Dichte von 3,663 g/cm3 und eine Porosität von 14,4, vol% sowie einen Bruchmodul von 10,9 N/mm2 auf. Da in der Regel während des Gießvorgangs des flüssigen Metalls in die Gussform auf die flüssige Metalloberfläche ein Abdeckpulver aufgebracht wird, weisen zumindest die Außenwände des Mantels 5 eine Schicht 12 auf, die für das verwendete Abdeckpulver chemisch resistent ist. Schicht 12 kann je nach Anforderungsprofil in Form einer dünnen Glasur unterschiedlicher Zusammensetzung aufgebracht werden. Der obere Teil 13 des glockenförmigen Mantels 5 ist in seiner äußeren Form trapezförmig ausgeformt und weist mittig eine konische Bohrung 14 zur Aufnahme des Tauchrohres 1 auf. Die Seitenwände 15 der im Wesentlichen konischen Bohrung 14 dienen der Befestigung des glockenförmigen Mantels 5 an der Außenfläche 8 des Tauchrohres 1. Die Außenflächen 8 des Tauchrohres 1 und die Außenflächen der Seitenwände 15 der konischen Bohrung 14 sind so aneinander angepasst, dass sie eine lösbare Verbindung bilden. Ein einfaches Ausführungsbeispiel der lösbaren Verbindung zwischen dem Tauchrohr 1 und dem glockenartigen Mantel 5 ist darin zu sehen, dass zumindest die Oberflächen der Wände mit einer 2 mm dicken Keramikschicht 16,16' beschichtet sind, deren Rauigkeit so bestimmt ist, dass allein die Reibung zwischen den Wänden eine ausreichende Verbindung herstellt. Eine andere lösbare Verbindung stellt ein Gewinde dar, dass sowohl auf der Außenwand des Tauchrohres 1 im Bereich der Berührung als auch in die Innenwände 15 der konischen Bohrung 14 des Mantel 5 eingearbeitet ist. Ein weiteres Befestigungsmittel wird mit Nuten in den Seitenwänden 15 der konischen Bohrung14 und passenden Zapfen auf der Außenwand des Tauchrohres 1 hergestellt, wobei als Sicherung an einer passenden Stelle eine seitliche, um 90° gedrehte Nut in der Wand 15 angeordnet ist, mit der ein Zapfen - hier nicht gezeigt - in Wirkverbindung steht, so dass eine sichere lösbare Verbindung zwischen den beiden Oberflächen hergestellt wird. Die obere Stirnfläche 17 des glockenartigen Mantels 5 ist im vorliegenden Ausführungsbeispiel als ebene Fläche ausgebildet, die mit dem eingelassenen Absatz 9 im Tauchrohr 1 kraft- und formschlüssig in Wirkverbindung steht. Der untere, im Wesentlichen zylindrische Teil 18 des glockenförmigen Mantels 5 schließt sich an den oberen trapezförmigen Teil 13 an und kann wahlweise getrennt hergestellt werden, so dass der glockenförmige Mantel 5 mindestens zweiteilig ausgebildet ist und an der Trennlinie 19 mit einem entsprechenden Verbindungsmechanismus befestigt wird. Ein für die Standzeit des glockenförmigen Mantels 5 besonders wichtiges Merkmal ist mindestens eine Öffnung oder Bohrung 20, die die Mantelwand vollständig durchdringt wobei die longitudinale Querschnittsform frei wählbar ist, z.B. zylindrisch oder konisch. Die Höhe der Mittelachse der Bohrung richtet sich primär nach dem Sitz der Auslassöffnungen 3, 3', 3" im Tauchrohr 1.The Fig. 4 shows a schematic sectional view of an embodiment of the refractory bell-shaped shell 5 of the present invention. The refractory and heat-resistant bell-shaped shell 5 is at least partially made of a material such as Al 2 O 3 (59.113%) Al 2 O 3 (59.113%) and SiO 2 (10.327%), and C (29.02%) carbon as essential constituents. This composition has a density of 2.416 g / cm3 and a porosity of 19.2 vol% and a modulus of rupture of 8.7 N / mm2. Another material could also be a composition of ZrO 2 (79.253%) SiO 2 (4.558%) and C (15.56%). This composition has a density of 3.663 g / cm 3 and a porosity of 14.4 vol% and a modulus of rupture of 10.9 N / mm 2. As a rule, during the casting process of the liquid metal in the mold the liquid metal surface is applied a cover powder, at least the outer walls of the shell 5, a layer 12 which is chemically resistant to the cover powder used. Layer 12 can be applied in the form of a thin glaze of different composition depending on the requirement profile. The upper part 13 of the bell-shaped jacket 5 is shaped trapezoidal in its outer shape and has centrally a conical bore 14 for receiving the dip tube 1. The side walls 15 of the substantially conical bore 14 serve to attach the bell-shaped shell 5 to the outer surface 8 of the dip tube 1. The outer surfaces 8 of the dip tube 1 and the outer surfaces of the side walls 15 of the conical bore 14 are adapted to each other so that they have a releasable connection form. A simple embodiment of the detachable connection between the dip tube 1 and the bell-shaped jacket 5 is to be seen in that at least the surfaces of the walls are coated with a 2 mm thick ceramic layer 16,16 'whose roughness is determined so that only the friction between makes the walls a sufficient connection. Another releasable connection is a thread that is incorporated both on the outer wall of the dip tube 1 in the region of contact and in the inner walls 15 of the conical bore 14 of the jacket 5. Another fastener is made with grooves in the sidewalls 15 of the conical bore 14 and mating studs on the outer wall of the dip tube 1 with a lateral, 90 ° rotated groove in the wall 15 as a securing at a convenient location, with a pin - Not shown here - is in operative connection, so that a secure releasable connection between the two surfaces is made. The upper end face 17 of the bell-shaped shell 5 is formed in the present embodiment as a flat surface which is positively and positively in operative connection with the recessed paragraph 9 in the dip tube 1. The lower, substantially cylindrical part 18 of the bell-shaped shell 5 adjoins the upper trapezoidal part 13 and can optionally be made separately, so that the bell-shaped shell 5 is formed at least in two parts and is fastened to the parting line 19 with a corresponding connection mechanism. A particularly important feature for the life of the bell-shaped shell 5 is at least one opening or bore 20 which completely penetrates the shell wall, wherein the longitudinal cross-sectional shape is freely selectable, eg cylindrical or conical. The height of the central axis of the bore depends primarily on the seat of the outlet openings 3, 3 ', 3 "in the dip tube 1.

Die Fig. 5 zeigt eine schematische Draufsicht von drei typischen Querschnittsformen a) - c) einer Gussform 21 bzw. Kokille, in die das flüssige Metall eingeführt wird. Die äußere Form des glockenartigen Mantels 5 richtet sich im Wesentlichen nach der Gussform 21, 21', 21" mit Wandungen 22, 22', 22", damit beim Austritt des flüssigen Metalls nach Möglichkeit an allen Stellen der Gussform eine gleichmäßige Ausbreitungsgeschwindigkeit erzielt wird, die dann für geringe Verwirbelungen in der Strömung sorgt. Somit ist es für eine runde Gussform 21 zweckmäßig, einen im Querschnitt runden glockenartigen Mantel 5 einzusetzen und entsprechend für eine ovale Gussform 21' einen ovalen glockenartigen Mantel, sowie für eine mehreckige Gussform 21" einen entsprechenden mehreckigen glockenförmigen Mantel 5.The Fig. 5 shows a schematic plan view of three typical cross-sectional shapes a) - c) of a mold 21 or mold into which the liquid metal is introduced. The outer shape of the bell-shaped shell 5 depends essentially on the mold 21, 21 ', 21 "with walls 22, 22', 22", so that at the outlet of the liquid metal, if possible, a uniform propagation velocity is achieved at all points of the mold, which then ensures little turbulence in the flow. Thus, it is useful for a round mold 21 to use a round bell-shaped shell 5 in cross-section and corresponding to an oval mold 21 'an oval bell-shaped jacket, and for a polygonal mold 21 "a corresponding polygonal bell-shaped jacket. 5

Zusammenfassend ist festzustellen, dass mit der vorliegenden Erfindung ein Tauchrohr 1 zum Stranggießen von flüssigen Metallen vorgestellt wird, das im unteren Bereich von einem lösbar befestigten feuerfesten glockenförmigen Mantel 5 umgeben ist. Die lösbare Verbindung 16 des glockenförmige Mantels 5 an der Oberfläche des unteren Teils 2 des Tauchrohres 1 kann mit verschiedenen technischen Mitteln auf verschiedene Art und Weise bewirkt werden, z. B. mittels eines Gewindes oder einer einfachen Steckverbindung. Die äußere Form des glockenartigen Mantels 5 ist frei wählbar, z. B. rund, oval oder mehreckig und richtet sich nach der Art des Anwendungsfalls.In summary, it should be noted that with the present invention, a dip tube 1 is presented for the continuous casting of liquid metals, which is surrounded in the lower part of a releasably secured refractory bell-shaped jacket 5. The detachable connection 16 of the bell-shaped shell 5 on the surface of the lower part 2 of the dip tube 1 can be effected by various technical means in various ways, for. B. by means of a thread or a simple plug connection. The outer shape of the bell-shaped shell 5 is arbitrary, z. B. round, oval or polygonal and depends on the nature of the application.

Claims (12)

  1. An immersion tube (1) for continuous casting liquid metal, for example steel, consisting of at least two parts (2, 5), at least one outlet opening (3, 4) being arranged in the end region (2), characterized in that a bell-like refractory mantle (5) is arranged in the end region (2) of the immersion tube (1) wich is releasably attached to the surface (8) in the lower region of the immersion tube (1).
  2. An immersion tube according to claim 1, wherein the bell-like refractory mantle (5) has a layer (12) in the area of contact with the liquid metal surface, the material of which is resistant to covering powder.
  3. An immersion tube according to claim 1, characterized in that at least the lower part (18) of the bell-like refractory mantle (5) is formed in the cross-section in various forms, e.g. round, oval or polygonal.
  4. An immersion tube according to claim 1, wherein the bell-like refractory mantle (5) has at least one bore.
  5. An immersion tube according to claim 1, wherein at least one outlet opening is arranged in the end region of the immersion tube (1), and the middle axis encloses a predetermined acute angle α with the outer surface of the bell-like refractory mantle (5), wherein the values for the angle α being between 10° and 80°, preferably between about 20° and 45°.
  6. An immersion tube according to claim 1, characterized in that the central bore (14) of the bell-like refractory mantle (5) which takes up the lower part of the immersion tube (1) has a surface (16) for fastening the bell-like refractory mantle (5), e.g. a thread, or a predetermined roughness for increasing the friction, or for receiving an adhesive or mortar, or elongated slots with or without a plug and rotation lock.
  7. An immersion tube according to one of the preceding claims, characterized in that the central bore is conically shaped in at least one partial region.
  8. An immersion tube according to claim 1, characterized in that at least the surface of the bell-like refractory mantle (5) comprises a material which containes e.g. about 59% AL203 and about 10% Si02 and about 29% C.
  9. Device according to one of the preceding claims, characterized in that at least the surface of the bell-like refractory mantle (5) comprises a material which is e.g. about 79% Zr02 and about 4.5% Si02 and about 29% C.
  10. Device according to one of the preceding claims, characterized in that at least one outlet opening is slightly conically shaped in the lower region of the immersion tube (1), whereas the larger diameter (D) of the outlet opening (3) pointing outwards.
  11. Device according to one of the preceding claims, characterized in that the bottom has at least one bore (4) at the end of the immersion pipe (1).
  12. A method for continuous casting of liquid metal, for example steel, into a casting mold (21, 21', 21") with an immersion pipe (1) which is surrounded by a bell-like refractory mantle (5) which is prefabricated in a detachable manner at the lower region (2, 2') of the immersion pipe (1) only at the site of use.
EP13719262.1A 2013-02-20 2013-02-20 Immersion pipe for producing cast metal strand parts, and strand casting method Not-in-force EP2991789B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE2013/000094 WO2014127754A1 (en) 2013-02-20 2013-02-20 Immersion pipe for producing cast metal strand parts, and strand casting method

Publications (2)

Publication Number Publication Date
EP2991789A1 EP2991789A1 (en) 2016-03-09
EP2991789B1 true EP2991789B1 (en) 2017-05-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP13719262.1A Not-in-force EP2991789B1 (en) 2013-02-20 2013-02-20 Immersion pipe for producing cast metal strand parts, and strand casting method

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EP (1) EP2991789B1 (en)
WO (1) WO2014127754A1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE7409971L (en) 1973-09-11 1975-03-12 Voest Ag
RU2236326C2 (en) 2002-11-04 2004-09-20 Хлопонин Виктор Николаевич Method for continuous casting of steel from intermediate ladle to mold and submersible nozzle for performing the same
ATE450332T1 (en) * 2006-05-11 2009-12-15 Giovanni Arvedi IMMERSION CASTING TUBE FOR CONTINUOUS CASTING OF STEEL
RU2359782C2 (en) 2007-07-04 2009-06-27 Техком Гмбх Immersible sleeve

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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EP2991789A1 (en) 2016-03-09
WO2014127754A1 (en) 2014-08-28

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