EP0911096A1 - Busette de coulée pour installation de coulée continue des métaux, notamment de coulée entre cylindres - Google Patents
Busette de coulée pour installation de coulée continue des métaux, notamment de coulée entre cylindres Download PDFInfo
- Publication number
- EP0911096A1 EP0911096A1 EP98402543A EP98402543A EP0911096A1 EP 0911096 A1 EP0911096 A1 EP 0911096A1 EP 98402543 A EP98402543 A EP 98402543A EP 98402543 A EP98402543 A EP 98402543A EP 0911096 A1 EP0911096 A1 EP 0911096A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nozzle
- casting
- metal
- cylinders
- space
- 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.)
- Granted
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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
- B22D11/06—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. More specifically, it concerns the nozzles made of refractory material which bring the liquid metal into the space of casting continuous casting machines, especially those suitable for the 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 solidification of the product should begin sunk.
- the primary role of these nozzles is to protect the jet of atmospheric oxidation.
- 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 is composed 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 integrated 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 (so-called "parasitic solidifications”) which would disturb seriously the operation of the machine.
- the gills can have an orientation horizontal or oblique downward.
- 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 to improve the thermal homogeneity 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 infiltrate 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 the existing nozzles of prevent the formation of parasitic solidifications on the lateral faces.
- the invention relates to a nozzle for continuous casting installation 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, by providing them with vertical extensions in their two angles superiors.
- 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 of 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 openings 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 lateral faces which 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 ' solidify the liquid metal as the nozzle 3, connected to a non-distributor 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 notably its lack of rigidity at the outlet of the casting installation.
- FIG. 2 shows a first type 13 of nozzle made of refractory material according to the invention.
- the geometry of this nozzle 13 is calculated mainly 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 casting 4.
- Its interior space includes 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 substantially rectangular shape.
- Each end of this tubular portion 17 includes a hole 18, 18 ′ intended, once the nozzle 13 is 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 '.
- each vertical extension 20, 20 ', 20 has a width of 10 mm and a height of 10 mm about. They constitute the outlets of recesses 21, 21 'which themselves extend the tubular portion 17 of the interior space of the hollow head 15 on at least the portion terminal of its length, or even over its whole as shown in Figure 2a.
- 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.
- about its usual flow and flow mode with the main flow of liquid metal coming out of the central part of the openings 18, 18 'since the shape and the surface of the openings 18, 18' are only slightly modified.
- 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 essentials, 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 the 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 areas 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 casting 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 vents 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 provided with perforations allowing direct supply of hot metal to the areas of the casting 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)
- Examining Or Testing Airtightness (AREA)
- Pipe Accessories (AREA)
- Pipeline Systems (AREA)
Abstract
Description
- la figure 1 qui représente très schématiquement une installation de coulée continue entre cylindres vue de côté, montrant les zones où des solidifications parasites sont les plus susceptibles de se produire contre les faces latérales;
- la figure 2, qui montre vue de face en coupe selon IIb-IIb (figure 2a) et de profil (figure 2b) un premier exemple de busette selon l'invention;
- la figure 3, qui montre vue de face en coupe selon IIIb-IIIb (figure 3a) et de profil (figure 3b) un deuxième exemple de busette selon l'invention;
- la figure 4, qui montre vue de face en coupe selon IVb-IVb (figure 4a) et de profil (figure 4b) un troisième exemple de busette selon l'invention.
- une portion 26, 26' de forme générale rectangulaire s'étendant sur toute la largeur de l'ouïe 18, 18', munie dans ses angles supérieurs 19, 19' de prolongements verticaux 20, 20', 20" qui constituent les orifices de sortie d'évidements 21, 21' sensiblement horizontaux comme représenté (ils peuvent aussi être ascendants, et éventuellement divergents) débouchant dans la portion tubulaire 17 de l'espace intérieur de la tête 15;
- une portion 27, 27' située sous la précédente et constituant la partie inférieure de l'orifice de sortie de la partie terminale 24, 24' de l'espace intérieur 17 de la tête 15; cette portion 27, 27' a une largeur plus faible que la précédente (par exemple de moitié), et est centrée sur l'axe de symétrie vertical de l'ouïe 18, 18'.
Claims (6)
- Busette pour installation de coulée continue des métaux, notamment de coulée entre cylindres, du type comportant à son extrémité inférieure deux ouïes (18, 18') ménagées sur sa paroi latérale à l'opposé l'une de l'autre aux extrémités d'une portion tubulaire (17) de son espace intérieur, caractérisée en ce que lesdites ouïes (18, 18') comportent des prolongements verticaux (20, 20', 20") dans leurs deux angles supérieurs (19, 19').
- Busette selon la revendication 1, caractérisée en ce que lesdits prolongements verticaux (20, 20', 20") sont dirigés horizontalement et parallèlement à l'orientation générale de ladite portion tubulaire (17).
- Busette selon la revendication 1, caractérisée en ce que lesdits prolongements verticaux (20, 20', 20") sont dirigés de manière ascendante.
- Busette selon la revendication 1 ou 3, caractérisée en ce que lesdits prolongements verticaux (20, 20', 20") de chaque ouïe (18, 18') sont dirigés dans deux directions divergentes.
- Busette (23, 25) selon l'une des revendications 1 à 4, caractérisée en ce que, en dehors desdits prolongements verticaux (20, 20', 20"), lesdites ouïes (18, 18') sont orientées sur au moins une portion de leur section selon une direction descendante.
- Busette selon l'une des revendications 1 à 5, caractérisée en ce,que son espace intérieur comporte un ou des obstacles destinés à calmer les écoulements du métal liquide coulé.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9713203 | 1997-10-20 | ||
FR9713203A FR2769862B1 (fr) | 1997-10-20 | 1997-10-20 | Busette de coulee pour installation de coulee continue des metaux, notamment de coulee entre cylindres |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0911096A1 true EP0911096A1 (fr) | 1999-04-28 |
EP0911096B1 EP0911096B1 (fr) | 2003-05-07 |
Family
ID=9512493
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98402543A Expired - Lifetime EP0911096B1 (fr) | 1997-10-20 | 1998-10-14 | Busette de coulée pour installation de coulée continue des métaux, notamment de coulée entre cylindres |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0911096B1 (fr) |
AT (1) | ATE239570T1 (fr) |
DE (1) | DE69814293T2 (fr) |
DK (1) | DK0911096T3 (fr) |
ES (1) | ES2198669T3 (fr) |
FR (1) | FR2769862B1 (fr) |
PT (1) | PT911096E (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111421118A (zh) * | 2020-04-27 | 2020-07-17 | 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 (3)
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 |
EP0765702A1 (fr) * | 1995-09-28 | 1997-04-02 | USINOR SACILOR Société Anonyme | Busette pour l'introduction d'un métal liquide dans une lingotière de coulée continue des métaux |
EP0771600A1 (fr) * | 1995-10-30 | 1997-05-07 | Usinor Sacilor | Busette pour l'introduction d'un métal liquide dans une lingotière de coulée continue de produits métalliques, dont le fond comporte des orifices |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1472449A (en) * | 1973-09-04 | 1977-05-04 | Sumitomo Metal Ind | Nozzle for a continuous metal casting tundish |
-
1997
- 1997-10-20 FR FR9713203A patent/FR2769862B1/fr not_active Expired - Fee Related
-
1998
- 1998-10-14 DK DK98402543T patent/DK0911096T3/da active
- 1998-10-14 DE DE69814293T patent/DE69814293T2/de not_active Expired - Fee Related
- 1998-10-14 PT PT98402543T patent/PT911096E/pt unknown
- 1998-10-14 ES ES98402543T patent/ES2198669T3/es not_active Expired - Lifetime
- 1998-10-14 AT AT98402543T patent/ATE239570T1/de not_active IP Right Cessation
- 1998-10-14 EP EP98402543A patent/EP0911096B1/fr not_active Expired - Lifetime
Patent Citations (3)
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 |
EP0765702A1 (fr) * | 1995-09-28 | 1997-04-02 | USINOR SACILOR Société Anonyme | Busette pour l'introduction d'un métal liquide dans une lingotière de coulée continue des métaux |
EP0771600A1 (fr) * | 1995-10-30 | 1997-05-07 | Usinor Sacilor | Busette pour l'introduction d'un métal liquide dans une lingotière de coulée continue de produits métalliques, dont le fond comporte des orifices |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 009, no. 142 (M - 388) 18 June 1985 (1985-06-18) * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111421118A (zh) * | 2020-04-27 | 2020-07-17 | 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 |
Also Published As
Publication number | Publication date |
---|---|
DE69814293D1 (de) | 2003-06-12 |
EP0911096B1 (fr) | 2003-05-07 |
DK0911096T3 (da) | 2003-09-01 |
ES2198669T3 (es) | 2004-02-01 |
PT911096E (pt) | 2003-08-29 |
FR2769862A1 (fr) | 1999-04-23 |
DE69814293T2 (de) | 2004-04-08 |
ATE239570T1 (de) | 2003-05-15 |
FR2769862B1 (fr) | 1999-11-19 |
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