EP0911096B1 - Giessdüse für Metallstranggiessvorrichtung, insbesondere für Walzgiessmaschine - Google Patents

Giessdüse für Metallstranggiessvorrichtung, insbesondere für Walzgiessmaschine Download PDF

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Publication number
EP0911096B1
EP0911096B1 EP98402543A EP98402543A EP0911096B1 EP 0911096 B1 EP0911096 B1 EP 0911096B1 EP 98402543 A EP98402543 A EP 98402543A EP 98402543 A EP98402543 A EP 98402543A EP 0911096 B1 EP0911096 B1 EP 0911096B1
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EP
European Patent Office
Prior art keywords
nozzle
metal
casting
vertical extensions
cylinders
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
EP98402543A
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English (en)
French (fr)
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EP0911096A1 (de
Inventor
Laurent Gacher
Jean-Michel Damasse
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.)
Thyssen Stahl AG
USINOR SA
Original Assignee
Thyssen Stahl AG
USINOR 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
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Application filed by Thyssen Stahl AG, USINOR SA filed Critical Thyssen Stahl AG
Publication of EP0911096A1 publication Critical patent/EP0911096A1/de
Application granted granted Critical
Publication of EP0911096B1 publication Critical patent/EP0911096B1/de
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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
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/064—Accessories therefor for supplying molten metal
    • B22D11/0642—Nozzles

Definitions

  • the invention relates to the continuous casting of metals. Specifically, it concerns the nozzles made of refractory material which bring the liquid metal into the space of casting continuous casting machines, especially those that are suitable for casting thin strips a few mm thick, especially steel.
  • nozzles are connected by their upper end to the container serving as tank of liquid metal, called a distributor, and their lower end plunges into the bath of liquid metal contained in the mold, where the solidification of the product must begin sank.
  • the primary role of these nozzles is to protect the jet of liquid metal on its path between the container and the mold. They also allow, thanks to appropriate configurations of their lower end, to orient favorably liquid metal flows into the mold so that the product solidifies takes place in the best possible conditions.
  • the casting of thin metal strips a few mm thick directly at from liquid metal can take place on a so-called installation of "casting between cylinders". It includes an ingot mold whose casting space is defined on its long sides by a pair of internally cooled cylinders with horizontal axes parallel and rotating around these axes in opposite directions, and on its short sides by closing plates (called side faces) of refractory material applied against ends of cylinders. Cylinders can also be replaced by bands endlessly cooled.
  • the first part consists of a tube cylindrical, the upper end of which is connected to an opening in the bottom of the distributor which constitutes the reserve of liquid steel supplying the ingot mold.
  • This orifice is can be closed at will by the operator, partially or completely, thanks to a stopper or a drawer system ensuring the regulation of the metal flow. From the section of this hole depends on the maximum metal flow that can flow inside the nozzle.
  • the second part fixed to the lower end of the preceding tube, for example by screwing, or being built-in construction, is intended to be immersed in the liquid metal bath present in the mold.
  • the interior space of this hollow element has a general shape more or less elongated according to the dimensions of the casting space of the machine on which the nozzle is to be mounted. It is oriented substantially perpendicular to the tube.
  • the hollow element When the nozzle is in service, the hollow element is placed parallel to the cylinders, and the liquid metal flows into the mold through gills made at each end of the hollow element.
  • the metal flows coming out of the nozzle are thus preferably oriented in the direction of the lateral faces, so to bring hot metal to their surfaces, and thus avoid the occurrence of unwanted solidifications of metal (called “parasitic solidifications”) which would disturb seriously the operation of the machine.
  • the gills can have an orientation horizontal or downward oblique.
  • Various holes of less importance than these gills can also be provided on the side walls and / or the bottom of the nozzle, so to directly supply hot metal to the regions of the mold located on the sides of the nozzle and / or under it. The aim is thus, in particular, to improve the thermal uniformity of the metal present in the mold.
  • a simple preferential orientation of the hot metal flows towards the faces lateral is often insufficient to permanently guarantee an absence of parasitic solidifications, in particular in the vicinity of the contact zones between the cylinders and the side faces. This results in degradations of the lateral faces which compromise the sealing of the casting space. Metal can then seep between the side faces and the cylinders and solidify there, which further aggravates the deterioration of the lateral faces, or even escape in a liquid state from the machine, with all the risks that this entails for installation and staff. In all cases, the quality of the edges of the strip is adversely affected.
  • the object of the invention is to provide a nozzle which, when used on a continuous casting installation between cylinders, allows better than existing nozzles of prevent the formation of parasitic solidifications on the lateral faces.
  • the subject of the invention is a nozzle for installation for the continuous casting of metals, in particular of casting between cylinders, of the type comprising at its lower end two openings made on its side wall opposite one another at the ends of a tubular portion of its interior space, characterized in that said vents comprise vertical extensions in their two upper angles.
  • said gills are shaped so as to give the liquid metal emerging from said vertical extensions an orientation substantially horizontal or ascending, and at least part of the remainder of the liquid metal a downward orientation.
  • the invention consists in modifying the configuration of the gills conventional nozzles, providing them with vertical extensions in their two angles higher.
  • the function of these vertical extensions is to provide greater speed of exit to the metal leaving the lateral parts of the gills, which is thus more likely directly reach areas of the casting space where it is desirable for the metal to be as hot as possible to avoid the appearance of parasitic solidifications on the faces side.
  • This is, in particular, the case for the upper parts of the casting space of the casting machines between cylinders close to the contact zones between the cylinders and the side faces.
  • the preferred configuration previously described, where the metal leaving the central part of the gills is oriented essentially towards the bottom of the casting space, also allows hot metal to be brought directly into the lower areas of casting space. In this way we seek to avoid the presence of parasitic solidifications on the side faces that would form just above the neck (the level where the surfaces of the cylinders are closest to each other).
  • Installation of continuous casting of thin metal strips between cylinders shown very schematically in Figure 1 comprises in known manner a pair of internally cooled cylinders 1, 1 'with horizontal axes. Their external surfaces 2, 2 ' ensure the solidification of the liquid metal that the nozzle 3, connected to a distributor not shown, brings into the casting space 4 thanks to its gills 5.
  • the casting space 4 is defined by said external surfaces 2, 2 'of the cylinders 1, 1' where they face each other. It is laterally closed by refractory side faces, including, to make the space visible casting 4, only one of them 6 is shown. They are applied against lateral ends 7, 7 'of the cylinders 1, 1'.
  • the minimum width "e" of the casting space 4 corresponds substantially to the desired thickness for the cast strip, and is encountered at level of the neck 8, that is to say where the external surfaces 2, 2 'of the cylinders 1, 1' are the most close to each other.
  • a too early end of solidification would oblige the cylinders 1, 1 'to exert a rolling force on the product, while they do not have the mechanical resistance necessary for this purpose.
  • an end of solidification located substantially below the neck 8 would cause the appearance of defects on the product, due in particular to its lack of rigidity at the outlet of the casting installation.
  • the risk of parasitic solidifications can be expected of metal on the side faces 6 are the largest in the area 9 located just above of the neck 8.
  • the neck 8 is, as we said, the level at which the solidification of the strip, and this zone 9 is therefore that where the temperature of the liquid metal in contact with the faces side 6 must reach its minimum value.
  • This zone 9 around the neck 8 is effectively sensitive to parasitic solidifications, but that two other places are also of great importance from this point of view.
  • FIG. 2 shows a first type 13 of nozzle made of refractory material according to the invention.
  • the geometry of this nozzle 13 is mainly calculated to avoid parasitic solidifications in the upper zones 10, 11 of the lateral faces 6 previously described.
  • this nozzle 13 is formed of two parts.
  • the first part is a tube 14 whose upper end not shown is intended to be connected to the distributor containing the liquid steel to be poured.
  • the second part is a head hollow 15 fixed to the tube 14, for example by screwing. Alternatively, both parties can be brought together in one piece.
  • the lower end of the hollow head 15 can, as shown, be slightly tapered to better fit the general shape of the space 4.
  • Its interior space has a cylindrical portion 16 extending the space inside the tube 14.
  • This cylindrical portion 16 opens into a tubular portion 17 which is substantially perpendicular to it, and whose cross section, in the example shown, has a generally rectangular shape.
  • Each end of this tubular portion 17 has a hole 18, 18 'intended, once the nozzle 13 mounted to be oriented towards one of the side faces 6 closing the casting space 4 of the casting machine.
  • the vents 18, 18 ' have in their upper corners 19, 19' vertical extensions 20, 20 ', 20 "whose width represents only a relatively small fraction of the total width of the hearing 18, 18 '.
  • the function of these vertical extensions 20, 20 ', 20 "and of these recesses 21, 21' will now be explained.
  • the presence of the vertical extensions 20, 20 ', 20 "located in the upper corners 19, 19 'of the openings 18, 18' and of the recesses 21, 21 'which there drive allows to take advantage of this phenomenon to reduce the risk of formation of parasitic solidifications on the upper zones 10, 11 of the lateral faces 6.
  • vents 18, 18 'higher in the casting space 4 without modifying their shape and their dimensions (by changing the geometry of the nozzle 13 or by decreasing the depth of its immersion in the casting space 4) would likely to deteriorate the circulation of liquid metal in the lower part of the space casting 4, and thus generate other parasitic solidifications.
  • the recesses 21, 21 'and the vertical extensions 20, 20 ', 20 “of the vents 18, 18' are directed horizontally and parallel to the general orientation of the tubular portion 17 of the interior space of the head 15.
  • the openings 18, 18 ′ have a general shape rectangular, but other shapes can be envisaged, in particular for their edges lower: triangular with point down, rounded ...
  • the essential, from the point of view of the invention resides in the presence of the vertical extensions 20, 20 ', 20 "in the corners upper gills 18,18 '.
  • the geometry of the nozzle 13 which has just been described aims at first place to solve the problem of parasitic solidifications which can occur in zones 10, 11 of the side faces 6 located in the upper part of the casting space 4, in the vicinity of the cylinders 1, 1 '. Its use supposes that one does not notice usually annoying parasitic solidifications in the zones 9 of the lateral faces 6 located just above the neck 8. This may be the case, in particular, if the nozzle 13 is submerged relatively deep into the casting space 4, or if the casting space 4 has a reduced depth because the cylinders 1, 1 ′ have a small diameter: in these conditions, the hot metal leaving the nozzle 13 has no difficulty reaching said zones 9. For cases where solidification problems also arise parasites in these zones 9, it is proposed to use a nozzle 23 as shown in the figure 3.
  • this nozzle 23 is the same as that of the nozzle 13 of FIG. 2, and the identical elements of these two nozzles 13, 23 are designated by the same references in FIGS. 2 and 3.
  • the essential modification resides in the fact that the tubular portion 17 of the interior space of the head 15 present, at least in its parts terminals 24, 24 'close to the vents 18, 18', an inclination of an angle ⁇ relative to the horizontal. This inclination makes it possible to orient the jets of liquid metal coming from the part central hearing 18, 18 'towards the lower part of the casting space 4, with for the purpose of ensuring the supply of hot metal in the vicinity of the lower zone 9 of the side face 6 which corresponds to it.
  • the value of the angle ⁇ (which can reach if necessary several tens of degrees) must be determined according to the shapes and dimensions respective of the pouring space 4 and the nozzle 23, as well as the depth nominal immersion of the nozzle 23.
  • the vents 18, 18 ' are, as in the nozzle 13 of Figure 2 and according to the invention, provided in their angles upper 19, 19 'of vertical extensions 20, 20', 20 "which constitute the orifices of outlet of recesses 21, 21 'opening into the tubular portion 17 of the interior space of the head 15.
  • said end portion 24, 24 'of the space inside 17 of head 15 is inclined downward by an angle ⁇ with respect to the horizontal. But this inclination only concerns the central parts of the interior space 17, those which lead to the lower portions 27, 27 'of the openings 18, 18'.
  • nozzles 13, 23, 25 which have been described and shown are not as examples of implementation of the invention.
  • provision may be made to fill the cylindrical interior spaces with the tube 14 and / or the hollow head 15, or of the tubular portion 17 of the interior space of the head 15 by one or more obstacles which stabilize the flows.
  • the aim would in particular be to improve the filling the louvers 18, 18 'with liquid metal: this would allow us to benefit more assuredly advantages of the invention.
  • Such obstacles are, for example, described in the document EP-A-0 765 702. This last document describes nozzles whose hollow head has a very elongated shape, which can also benefit from the invention.
  • the invention is also fully adaptable to nozzles whose side walls and / or the bottom of the hollow head 15 would be fitted with perforations allowing direct supply of hot metal to the areas of the pouring space 4 located along the nozzle or below it, such as the perforations described in document EP-A-0 771 600.
  • nozzles according to the invention can be installed on other continuous casting plants than thin strip casting plants between two cylinders, if their use gives liquid metal flows advantageous configurations.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Pipe Accessories (AREA)
  • Pipeline Systems (AREA)
  • Examining Or Testing Airtightness (AREA)

Claims (6)

  1. Düse für Metallstranggießvorrichtung, insbesondere für eine Walzgießvorrichtung vom Typ, umfassend einen ersten röhrenförmigen Teil (14), das zum Anschluß an den Zwischenbehälter der Gießvorrichtung bestimmt ist, und einem zweiten Teil, das einen Innenraum mit einem röhrenförmigen Anteil (17) hat, welcher wesentlich senkrecht zum ersten Teil (14) ausgerichtet ist, und an jedem seiner äußeren Enden zwei Auslassöffnungen (18, 18') umfaßt, dadurch gekennzeichnet, daß die Auslassöffnungen (18, 18') einzig und allein in ihren zwei oberen Ecken (19,19') senkrechte Verlängerungen (20, 20', 20") aufweisen.
  2. Düse nach Anspruch 1, dadurch gekennzeichnet, daß die senkrechten Verlängerungen (20, 20' und 20") horizontal und parallel zur allgemeinen Orientierung des röhrenförmigen Anteils (17) ausgerichtet sind.
  3. Düse nach Anspruch 1, dadurch gekennzeichnet, daß die senkrechten Verlängerungen (20, 20' und 20") in aufsteigender Art und Weise ausgerichtet sind.
  4. Düse nach Anspruch 1 oder 3, dadurch gekennzeichnet, daß die senkrechten Verlängerungen (20, 20' und 20") jeder Auslassöffnung (18, 18') nach zwei divergierenden Richtungen ausgerichtet sind.
  5. Düse (23, 25) nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Auslassöffnungen (18, 18'), außerhalb der senkrechten Verlängerungen (20, 20' und 20"), wenigstens auf einem Teil ihres Abschnitts abfallend ausgerichtet sind.
  6. Düse nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß ihr Innenraum mit einem Hindernis oder mit Hindernissen ausgestattet ist, die dazu bestimmt sind, das Ausfließen des schmelzflüssigen Metalls zu beruhigen.
EP98402543A 1997-10-20 1998-10-14 Giessdüse für Metallstranggiessvorrichtung, insbesondere für Walzgiessmaschine Expired - Lifetime EP0911096B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9713203A FR2769862B1 (fr) 1997-10-20 1997-10-20 Busette de coulee pour installation de coulee continue des metaux, notamment de coulee entre cylindres
FR9713203 1997-10-20

Publications (2)

Publication Number Publication Date
EP0911096A1 EP0911096A1 (de) 1999-04-28
EP0911096B1 true EP0911096B1 (de) 2003-05-07

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EP98402543A Expired - Lifetime EP0911096B1 (de) 1997-10-20 1998-10-14 Giessdüse für Metallstranggiessvorrichtung, insbesondere für Walzgiessmaschine

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EP (1) EP0911096B1 (de)
AT (1) ATE239570T1 (de)
DE (1) DE69814293T2 (de)
DK (1) DK0911096T3 (de)
ES (1) ES2198669T3 (de)
FR (1) FR2769862B1 (de)
PT (1) PT911096E (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111421118B (zh) * 2020-04-27 2023-07-21 贵州莹月帆铝制品有限公司 一种便于晶粒控制的铝合金铸轧机双铸嘴结构

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3951317A (en) * 1973-09-04 1976-04-20 Sumitomo Metal Industries, Ltd. Submerged tundish nozzle for continuous casting

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6021171A (ja) * 1983-07-16 1985-02-02 Nisshin Steel Co Ltd 幅広薄板連続鋳造装置
FR2739313B1 (fr) * 1995-09-28 1997-10-31 Usinor Sacilor Busette pour l'introduction d'un metal liquide dans une lingotiere de coulee continue des metaux
FR2740367B1 (fr) * 1995-10-30 1997-11-28 Usinor Sacilor Busette pour l'introduction d'un metal liquide dans une lingotiere de coulee continue de produits metalliques, dont le fond comporte des orifices

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3951317A (en) * 1973-09-04 1976-04-20 Sumitomo Metal Industries, Ltd. Submerged tundish nozzle for continuous casting

Also Published As

Publication number Publication date
ATE239570T1 (de) 2003-05-15
FR2769862B1 (fr) 1999-11-19
DE69814293T2 (de) 2004-04-08
ES2198669T3 (es) 2004-02-01
FR2769862A1 (fr) 1999-04-23
EP0911096A1 (de) 1999-04-28
PT911096E (pt) 2003-08-29
DE69814293D1 (de) 2003-06-12
DK0911096T3 (da) 2003-09-01

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