EP1781436A1 - Assembly of a pouring nozzle and collector nozzle - Google Patents

Assembly of a pouring nozzle and collector nozzle

Info

Publication number
EP1781436A1
EP1781436A1 EP05778484A EP05778484A EP1781436A1 EP 1781436 A1 EP1781436 A1 EP 1781436A1 EP 05778484 A EP05778484 A EP 05778484A EP 05778484 A EP05778484 A EP 05778484A EP 1781436 A1 EP1781436 A1 EP 1781436A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
collector
collector nozzle
pouring
assembly according
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.)
Withdrawn
Application number
EP05778484A
Other languages
German (de)
French (fr)
Inventor
Derek James Chalmers
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.)
Vesuvius Crucible Co
Original Assignee
Vesuvius Crucible Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vesuvius Crucible Co filed Critical Vesuvius Crucible Co
Priority to EP05778484A priority Critical patent/EP1781436A1/en
Publication of EP1781436A1 publication Critical patent/EP1781436A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B22D41/502—Connection arrangements; Sealing means therefor

Definitions

  • the present invention relates to the casting of molten metal and more particularly to an assembly of a pouring nozzle for casting a molten metal from an upstream metallurgical vessel and of a collector nozzle for said upstream metallurgical vessel; other embodiments of the invention relates to particular pouring nozzles and collector nozzles.
  • Liquid metal in particular liquid steel
  • liquid metal is often poured from one vessel to another.
  • liquid metal may be poured from a furnace into a ladle, and then from a ladle into a tundish and from a tundish into a mold.
  • liquid is poured into the tundish from a ladle, it is normally poured into the tundish through an outlet in the bottom of the ladle.
  • the stream of metal from the ladle is metered by a valve and the outlet stream may be enclosed in a ceramic tube, called a ladle shroud, which extends downward from the ladle bottom.
  • a typical tundish is a trough or box-shaped vessel having a generally horizontal or flat bottom with vertically arranged walls.
  • the stream of metal poured from the ladle i.e., incoming ladle stream or flow, enters the tundish and is then poured into the mold through an outlet in the bottom of the tundish.
  • the stream of metal from the tundish into the mold may be enclosed in a ceramic tube, called a submerged entry nozzle.
  • the present invention relates to an assembly of a pouring nozzle (for example a ladle shroud or a submerged entry nozzle) and of a collector nozzle (or more generally, a nozzle conveying the molten metal from the bottom of the upstream metallurgical vessel to the pouring nozzle discharging the molten metal into the downstream metallurgical vessel).
  • a pouring nozzle for example a ladle shroud or a submerged entry nozzle
  • collector nozzle or more generally, a nozzle conveying the molten metal from the bottom of the upstream metallurgical vessel to the pouring nozzle discharging the molten metal into the downstream metallurgical vessel.
  • connection There are two well known kinds of connection which will be described with reference to Figs. 1 and 2 between a pouring nozzle and a collector nozzle (2): a conical connection (Fig. 2) or a butt connection (Fig. 1).
  • the conical connection (Fig. 2) has a truncated conical collector nozzle (2) fitting into a tapered pouring nozzle throat (12) formed into the inner part of the pouring nozzle entry portion (11).
  • This offers the advantage of providing a large coupling surface between the two refractory nozzles, this allows some movements of the upstream metallurgical vessel or of the pouring nozzle during the casting operations and help keeping a good sealing.
  • the conical connection is self-centering. This property comes from the conical design itself.
  • the coupling operation is simple because the smaller dimension of the collector nozzles matches the bigger bore of the pouring nozzle.
  • the pouring nozzle is brought into place and maintained during the casting operation through a pouring nozzle manipulator. If the collector nozzle penetration into the pouring nozzle is too deep, disengagement after casting can become difficult.
  • the butt connection provides the connection between the pouring nozzle and the collector nozzle (2) through a flat surface; i.e. the annulus on the bottom of the collector nozzle tip seats against a surface (12) formed into the inner part (11 ) of the pouring nozzle entry portion which is orthogonal to the pouring axis (1) (defined by the collector nozzle (2) and pouring nozzle).
  • the inner part of the pouring nozzle entry portion comprises
  • the respective first surfaces of the pouring and collector nozzles permit the guiding of the collector nozzle within the pouring nozzle and damage to the inner wall of the pouring nozzle is avoided.
  • the distance between the respective first surfaces of the pouring and collector nozzles is chosen to ensure proper guiding..
  • the respective first surfaces of the pouring and collector nozzles have substantially matching frusto-conical surfaces.
  • the collector nozzle While it is not intended to have the collector nozzle seating against the pouring nozzle at that level, this will control the maximum angle of tilt of the pouring nozzle when connected. In particular, this will stiffen the connection between the pouring nozzle and collector nozzle and will authorize some movements of the pouring nozzle during the casting operations without impacting on the connection or the sealing.
  • the frusto-conical surface of the inner part of the pouring nozzle entry portion will have an angle of a few degrees (preferably 3 to 8°) more than the outer surface of the collector nozzle to allow an easy engagement of the nozzles.
  • the respective second surfaces of the pouring and collector nozzles are spaced apart and adapted to receive a sealing gasket.
  • the distance between the respective second surfaces of the pouring and collector nozzles is chosen to give a predetermined compression to the sealing gasket and ensure a good sealing when the nozzles are engaged.
  • Another important advantage of the invention is that the coupling of the pouring and collector nozzles is achieved on a significant length of the nozzles so that small movements of the upstream metallurgical vessel will only have a relatively limited impact on the seal, contrarily to what was previously observed with the butt connection. It is also important to note that since there is no need to introduce another body (for example a gasket) at the level of the third or abutment surfaces, disengagement of the nozzles at the end of the casting operations can be performed very easily.
  • the third surface is comprised in a plan orthogonal to the pouring axis, the steel is more likely to infiltrate between the respective third surfaces. Third surfaces frusto-conical or concave are thus prefered.
  • the second surfaces are spaced away from the third surfaces.
  • the respective third surfaces can be located upstream or downstream from the second surface.
  • the respective third surfaces are located downstream from the second surfaces of the pouring and collector nozzle.
  • this allows the second surface to be as remote as possible from the portions of the nozzle which will contact the molten metal.
  • the second surface or the sealing gasket, positioned on the second surface remains clean, the disengagement of the nozzles at the end of the casting operations can be performed very easily and the pouring nozzle can be used again for another casting operation.
  • the corresponding second surfaces of the collector and pouring nozzle can have any appropriate shape provided that their shapes form a complementary matching combination.
  • the second surfaces can be formed by frusto-conical surfaces. It is however preferred to have the second surfaces of the pouring nozzle and collector nozzle located in a plan orthogonal to the pouring axis, for example when these second surfaces are annular flat surfaces extending respectively all around the pouring nozzle bore and the collector nozzle. This will provide substantially horizontal sealing surfaces. In addition, this will authorize the use of an annular flat sealing gasket if this is required by the application. In the scope of the present invention, annular means not only circular but also oval. [0017] According to a particularly advantageous embodiment of the invention, a sealing gasket is inserted between the respective second surfaces of the pouring nozzle and collector nozzle. The tightness of the seal will thereby be greatly improved.
  • the sealing gasket will, according to the invention, be held in a contained internal chamber (formed by the second surface of the collector nozzle, the collector nozzle outer surface just downstream the second surface, the pouring nozzle second surface and the pouring nozzle inner surface just upstream from the second surface) to form good airtight seal.
  • Any gasket material suitable for high temperature applications can be used according to the invention, for example ceramic or fiber gaskets can be used.
  • a sealing gasket made from graphite will be used.
  • the sealing gasket has a frusto-conical or flat annular shape depending on the shape of the respective second surfaces of the pouring nozzle and collector nozzle.
  • the sealing gasket is pre- positioned on the collector nozzle before its assembly with the pouring nozzle.
  • the collector nozzle comprises retaining means or a retainer for the sealing gasket to prevent it from falling down when the collector nozzle is maintained in casting position or during a manipulation of the collector nozzle.
  • the sealing gasket can be fixedly attached to the collector nozzle, for example glued with any appropriate glue.
  • the sealing gasket will be retained by a particular design or shape formed on the collector nozzle, at the level of the sealing surface. Such a shape can for example be a circular groove formed all around the collector nozzle or just a cylindrical portion allowing the sealing gasket to be forced into position.
  • connection between the pouring nozzle and the collector nozzle is formed by the respective third or abutment surfaces of the pouring nozzle and collector nozzle.
  • the third or abutment surfaces of the pouring nozzle and of the collector nozzle can form a conical, butt or swivel connection.
  • they form a swivel connection; i.e. the external shape of the collector nozzle is convex rounded or curved (for example hemispherical) and engages into a substantially matching corresponding portion of the inner shape of the pouring nozzle entry portion which is thus also rounded or curved (for example hemispherical) but concave.
  • the swivel connection will provide a very large clearance when engaging the collector nozzle into the pouring nozzle. It will also allow the pouring nozzle to center during engagement; it is also to be noted that the manufacturing tolerances of rounded or curved (particularly spherical or hemispherical) articles (and especially the impact of such manufacturing tolerances on the positioning of the connection) is very low.
  • the bottom end of the collector nozzle engages into the corresponding matching portion of the pouring nozzle before the sealing gasket enters the pouring nozzle; thereby the collector nozzle engagement is guided by its outer surface sliding into the pouring nozzle corresponding surface and consequently, any damage of the sealing gasket which could otherwise occur due to impact against the pouring nozzle top end surface is efficiently prevented.
  • the bore of the collector nozzle matches substantially the bore of the pouring nozzle so that a substantially continuous bore is formed between the collector and pouring nozzles. If necessary, the bore of the pouring nozzle can be reduced at the level of the connection to match the bore of the collector nozzle. Thereby, the bottom end of the collector nozzle is contained within the pouring nozzle body and does not enter into contact with molten metal. Consequently, the bottom and outer surfaces of the collector nozzle remain clean so that the collector nozzle can be reused without substantial cleaning or maintenance operations.
  • the collector nozzle can be provided with a metal envelope. The above-described arrangement efficiently prevents deteriorating the metal envelope with molten metal sticking thereon.
  • the invention relates to a pouring nozzle for use in an assembly forming a butt connection wherein the inner part of the pouring nozzle entry portion comprises:
  • a third surface comprised in a plan orthogonal to the pouring axis.
  • the invention also relates to a pouring nozzle used in an assembly forming a swivel connection wherein the inner part of the pouring nozzle entry portion comprises:
  • first surface (115) essentially frusto-conical, and - dowstream from the first surface with respect to the molten metal flow, a second surface, and
  • the second surface of these pouring nozzles is an annular flat surface extending respectively all around the pouring nozzle bore.
  • the invention relates to a collector nozzle for use in the above described assembly wherein the collector nozzle comprises:
  • the collector nozzle comprises retaining means or a retainer for the sealing gasket so that the collector nozzle can be manipulated or even held in position without risk for the sealing gasket to fall down.
  • the sealing gasket can be fixedly attached to the collector nozzle, for example glued with an appropriate glue.
  • the sealing gasket will be retained by a particular design or shape formed on the collector nozzle, at the level of the sealing surface. Such a shape can for example be a circular groove formed all around the collector nozzle or just a cylindrical portion allowing the sealing gasket to be forced in position.
  • the invention relates to a collector nozzle for use in an assembly forming a butt connection.
  • the third surafce of the collector nozzle is comprised in a plan orthogonal to the pouring axis.
  • the invention also relates to a collector nozzle used in an assembly forming a swivel connection wherein the collector nozzle comprises:
  • the sealing surface of these collector nozzles is an annular flat surface extending respectively all around the collector nozzle.
  • Fig. 1 and 2 show cross-sectional views of prior art assemblies of a pouring nozzle and a collector nozzle
  • Figs. 3, 8 and 9 show cross-sectional views of pouring nozzles for use in an assembly according to the invention (the bottom portion of the pouring nozzles is not shown);
  • Figs. 4 show an assembly according to the invention (with the pouring nozzle of Fig. 3 and the collector nozzle of Fig. 6);
  • Figs. 5, 6, 7 and 10 show cross-sectional views of collector nozzles for use in an assembly according to the invention (the top portion of the collector nozzles is not shown); Figs. 11 and 12 show perspective views of sealing gaskets which can be used in assemblies according to the invention.
  • FIGs. 1 and 2 show thus prior art pouring nozzle and collector nozzle assemblies wherein the collector nozzle 2 is seen engaging the inner part of the pouring nozzle entry portion 11 which has shape 12 matching and complementary to the outer surface of the collector nozzle 2.
  • Such assemblies can form butt (Fig. 1) or conical (Fig. 2) connections.
  • pouring nozzles entry portion of the inner part of which 11 being adapted for matching engagement with a corresponding collector nozzle 20,30,40,50 outer shape.
  • the inner part of the pouring nozzle entry portion 11 comprises a third surface or abutment surface 12,102,112 for a matching third surface or abutment surface 22,32,42,52 of the collector nozzle 20,30,40,50, and a second surface 13,103,113 matching a corresponding second surface 23,33,43,53 of the collector nozzle 20,30,40,50.
  • Fig. 4 shows an assembly according to the invention wherein the pouring nozzle of Fig. 3 has been assembled with the collector nozzle of Fig. 6.
  • a sealing gasket 8 has been inserted between the collector nozzle 30 and the pouring nozzle at the level of their respective second surfaces 13,33.
  • the downstream end of the collector nozzle 30 engages into the pouring nozzle until a certain point wherein its third surface 32 abuts against the third surface 12 of the pouring nozzle.
  • the sealing gasket 8 is subjected to a predetermined pressure by the respective second surfaces 13,33 of the pouring nozzle and collector nozzle.
  • the frusto-conical first surface 15 of the pouring nozzle minimises the frusto-conical first surface 15 of the pouring nozzle
  • Figs. 8 and 9 show different embodiments of the collector nozzle 20,30,40,50. Their common features are the presence of the third or abutment surface 22,32,42,52 and the second surface 23,33,43,53. Also visible on these figures are the following optional features:
  • FIG. 12 shows a perspective view of an annular sealing gasket (as also depicted on Fig. 4) which can be used for example with the collector nozzles 20,30,40 of Figs. 5 to 7 while Fig. 11 shows a perspective view of a frusto- conical sealing gasket (as also depicted on Fig. 10) which can be used for example with the collector nozzle 50 of Fig. 10.

Abstract

The invention relates to an assembly of a pouring nozzle and of a collector nozzle (20,30,40,50), the inner shape of the pouring nozzle entry portion (11) being adapted for matching engagement with said collector nozzle outer shape. According to the invention, the inner part of the pouring nozzle entry portion comprises an abutment surface (12,102,112) for a matching abutment surface (22,32,42,52) of the collector nozzle (20,30,40,50) and a second surface (13,103,113) matching corresponding second surface (23,33,43,53) of the collector nozzle (20,30,40,50); the abutment surface being located downstream from the second surface. This assembly presents the following : a)a better seal between the pouring nozzle and collector than that achieved with a butt connection or a conical connection; b) a controlled compression of the sealing gasket(if present); c)an easy alignment of the pouring nozzle and collector nozzle allowing an easy coupling without damaging the gasket (if present); c) a controlled engagement of the collector nozzle into the pouring nozzle which does not depend upon the manipulator force or upon the positioning of the gasket (if present); d) a self -centering of the collector nozzle into the pouring nozzle.

Description

ASSEMBLY OF A POURING NOZZLE AND A COLLECTOR NOZZLE
Description.
[0001] The present invention relates to the casting of molten metal and more particularly to an assembly of a pouring nozzle for casting a molten metal from an upstream metallurgical vessel and of a collector nozzle for said upstream metallurgical vessel; other embodiments of the invention relates to particular pouring nozzles and collector nozzles.
[0002] Liquid metal, in particular liquid steel, is often poured from one vessel to another. For example, liquid metal may be poured from a furnace into a ladle, and then from a ladle into a tundish and from a tundish into a mold. When liquid is poured into the tundish from a ladle, it is normally poured into the tundish through an outlet in the bottom of the ladle. The stream of metal from the ladle is metered by a valve and the outlet stream may be enclosed in a ceramic tube, called a ladle shroud, which extends downward from the ladle bottom. [0003] A typical tundish is a trough or box-shaped vessel having a generally horizontal or flat bottom with vertically arranged walls. The stream of metal poured from the ladle, i.e., incoming ladle stream or flow, enters the tundish and is then poured into the mold through an outlet in the bottom of the tundish. The stream of metal from the tundish into the mold may be enclosed in a ceramic tube, called a submerged entry nozzle.
[0004] The present invention relates to an assembly of a pouring nozzle (for example a ladle shroud or a submerged entry nozzle) and of a collector nozzle (or more generally, a nozzle conveying the molten metal from the bottom of the upstream metallurgical vessel to the pouring nozzle discharging the molten metal into the downstream metallurgical vessel).
[0005] There are two well known kinds of connection which will be described with reference to Figs. 1 and 2 between a pouring nozzle and a collector nozzle (2): a conical connection (Fig. 2) or a butt connection (Fig. 1). The conical connection (Fig. 2) has a truncated conical collector nozzle (2) fitting into a tapered pouring nozzle throat (12) formed into the inner part of the pouring nozzle entry portion (11). This offers the advantage of providing a large coupling surface between the two refractory nozzles, this allows some movements of the upstream metallurgical vessel or of the pouring nozzle during the casting operations and help keeping a good sealing. In addition, the conical connection is self-centering. This property comes from the conical design itself. The coupling operation is simple because the smaller dimension of the collector nozzles matches the bigger bore of the pouring nozzle. In general, the pouring nozzle is brought into place and maintained during the casting operation through a pouring nozzle manipulator. If the collector nozzle penetration into the pouring nozzle is too deep, disengagement after casting can become difficult. [0006] The butt connection provides the connection between the pouring nozzle and the collector nozzle (2) through a flat surface; i.e. the annulus on the bottom of the collector nozzle tip seats against a surface (12) formed into the inner part (11 ) of the pouring nozzle entry portion which is orthogonal to the pouring axis (1) (defined by the collector nozzle (2) and pouring nozzle). The coupling is not so easy to achieve as for a conical connection and high upward clamping force is required from the manipulator since any relative movement of the pouring nozzle with respect to the upstream metallurgical vessel will affect the seal of the connection. [0007] In both cases, a sealing gasket can be introduced between the collector nozzle and the pouring nozzle. The addition of a gasket provides indeed a better seal, but the gasket becomes then a part of the method of coupling the pouring nozzle with the collector nozzle. Variable locations of the gasket or manipulator forces cause different gasket compressions and therefore variable seal quality. Another problem that often occurs when a sealing gasket is used is that the gasket can be damaged during the engagement of the collector nozzle into the pouring nozzle.
[0008] It is therefore an object of the present invention to provide a pouring nozzle and collector nozzle connection which presents the following advantages: a) a better seal between the pouring nozzle and collector nozzle than that achieved with a butt connection or a conical connection; b) a controlled compression of the sealing gasket (if present); c) an easy alignment of the pouring nozzle and collector nozzle allowing an easy coupling without damaging the gasket (if present); c) a controlled engagement of the collector nozzle into the pouring nozzle which does not depend upon the manipulator force or upon the positioning of the gasket (if present); d) a self-centering of the collector nozzle into the pouring nozzle; e) an easy disengagement of the pouring nozzle at the end of the casting operations. [0009] It has been found than some or all of these advantages (and others) can be obtained with an assembly of a pouring nozzle and of a collector nozzle, the inner shape of the pouring nozzle entry portion being adapted for matching engagement with said collector nozzle outer shape. According to the invention, the inner part of the pouring nozzle entry portion comprises
- a first surface matching a first surface of the collector nozzle, and
- downstream from the first surface with respect to the molten metal flow, a second surface matching a corresponding second surface of the collector nozzle, and
- dowstream from the second surface with respect to the molten metal flow, a third surface matching a third surface of the collector nozzle,
- the first surface of the pouring nozzle being spaced apart from the first surface of collector nozzle, the second surface of the pouring nozzle being spaced apart from the second surface of collector nozzle and the third surface of the pouring nozzle abutting the third surface of the collector nozzle. [0010] The respective first surfaces of the pouring and collector nozzles permit the guiding of the collector nozzle within the pouring nozzle and damage to the inner wall of the pouring nozzle is avoided. The distance between the respective first surfaces of the pouring and collector nozzles is chosen to ensure proper guiding.. [0011] According to an advantageous embodiment of the invention, the respective first surfaces of the pouring and collector nozzles have substantially matching frusto-conical surfaces. While it is not intended to have the collector nozzle seating against the pouring nozzle at that level, this will control the maximum angle of tilt of the pouring nozzle when connected. In particular, this will stiffen the connection between the pouring nozzle and collector nozzle and will authorize some movements of the pouring nozzle during the casting operations without impacting on the connection or the sealing. In general, the frusto-conical surface of the inner part of the pouring nozzle entry portion will have an angle of a few degrees (preferably 3 to 8°) more than the outer surface of the collector nozzle to allow an easy engagement of the nozzles. [0012] The respective second surfaces of the pouring and collector nozzles are spaced apart and adapted to receive a sealing gasket. When a gasket is used, the distance between the respective second surfaces of the pouring and collector nozzles is chosen to give a predetermined compression to the sealing gasket and ensure a good sealing when the nozzles are engaged. [0013] Thanks to the matching third or abutments surfaces, the positioning of the pouring and collector nozzles is precisely defined, whatever the force applied by the manipulator. Therefore, by selecting an appropriate distance between the respective third and second surfaces of the pouring and collector nozzles, a good seal can be achieved.
[0014] Another important advantage of the invention, is that the coupling of the pouring and collector nozzles is achieved on a significant length of the nozzles so that small movements of the upstream metallurgical vessel will only have a relatively limited impact on the seal, contrarily to what was previously observed with the butt connection. It is also important to note that since there is no need to introduce another body (for example a gasket) at the level of the third or abutment surfaces, disengagement of the nozzles at the end of the casting operations can be performed very easily. When the third surface is comprised in a plan orthogonal to the pouring axis, the steel is more likely to infiltrate between the respective third surfaces. Third surfaces frusto-conical or concave are thus prefered.
[0015] It is clear that according to the invention, the second surfaces are spaced away from the third surfaces. The respective third surfaces can be located upstream or downstream from the second surface. Preferably however, the respective third surfaces are located downstream from the second surfaces of the pouring and collector nozzle. Advantageously, this allows the second surface to be as remote as possible from the portions of the nozzle which will contact the molten metal. This way, the second surface or the sealing gasket, positioned on the second surface, remains clean, the disengagement of the nozzles at the end of the casting operations can be performed very easily and the pouring nozzle can be used again for another casting operation. [0016] The corresponding second surfaces of the collector and pouring nozzle can have any appropriate shape provided that their shapes form a complementary matching combination. For example, the second surfaces can be formed by frusto-conical surfaces. It is however preferred to have the second surfaces of the pouring nozzle and collector nozzle located in a plan orthogonal to the pouring axis, for example when these second surfaces are annular flat surfaces extending respectively all around the pouring nozzle bore and the collector nozzle. This will provide substantially horizontal sealing surfaces. In addition, this will authorize the use of an annular flat sealing gasket if this is required by the application. In the scope of the present invention, annular means not only circular but also oval. [0017] According to a particularly advantageous embodiment of the invention, a sealing gasket is inserted between the respective second surfaces of the pouring nozzle and collector nozzle. The tightness of the seal will thereby be greatly improved. It is remarkable that the sealing gasket will, according to the invention, be held in a contained internal chamber (formed by the second surface of the collector nozzle, the collector nozzle outer surface just downstream the second surface, the pouring nozzle second surface and the pouring nozzle inner surface just upstream from the second surface) to form good airtight seal. Any gasket material suitable for high temperature applications can be used according to the invention, for example ceramic or fiber gaskets can be used. Preferably, a sealing gasket made from graphite will be used. The sealing gasket has a frusto-conical or flat annular shape depending on the shape of the respective second surfaces of the pouring nozzle and collector nozzle.
[0018] According to a preferred embodiment of the invention, the sealing gasket is pre- positioned on the collector nozzle before its assembly with the pouring nozzle. To this end, the collector nozzle comprises retaining means or a retainer for the sealing gasket to prevent it from falling down when the collector nozzle is maintained in casting position or during a manipulation of the collector nozzle. The sealing gasket can be fixedly attached to the collector nozzle, for example glued with any appropriate glue. Preferably however, the sealing gasket will be retained by a particular design or shape formed on the collector nozzle, at the level of the sealing surface. Such a shape can for example be a circular groove formed all around the collector nozzle or just a cylindrical portion allowing the sealing gasket to be forced into position. [0019] As discussed herebelow, the connection between the pouring nozzle and the collector nozzle is formed by the respective third or abutment surfaces of the pouring nozzle and collector nozzle. The third or abutment surfaces of the pouring nozzle and of the collector nozzle can form a conical, butt or swivel connection. Preferably, they form a swivel connection; i.e. the external shape of the collector nozzle is convex rounded or curved (for example hemispherical) and engages into a substantially matching corresponding portion of the inner shape of the pouring nozzle entry portion which is thus also rounded or curved (for example hemispherical) but concave. The swivel connection will provide a very large clearance when engaging the collector nozzle into the pouring nozzle. It will also allow the pouring nozzle to center during engagement; it is also to be noted that the manufacturing tolerances of rounded or curved (particularly spherical or hemispherical) articles (and especially the impact of such manufacturing tolerances on the positioning of the connection) is very low. According to a particular embodiment, the bottom end of the collector nozzle engages into the corresponding matching portion of the pouring nozzle before the sealing gasket enters the pouring nozzle; thereby the collector nozzle engagement is guided by its outer surface sliding into the pouring nozzle corresponding surface and consequently, any damage of the sealing gasket which could otherwise occur due to impact against the pouring nozzle top end surface is efficiently prevented.
[0020] According to another advantageous embodiment of the invention, the bore of the collector nozzle matches substantially the bore of the pouring nozzle so that a substantially continuous bore is formed between the collector and pouring nozzles. If necessary, the bore of the pouring nozzle can be reduced at the level of the connection to match the bore of the collector nozzle. Thereby, the bottom end of the collector nozzle is contained within the pouring nozzle body and does not enter into contact with molten metal. Consequently, the bottom and outer surfaces of the collector nozzle remain clean so that the collector nozzle can be reused without substantial cleaning or maintenance operations. In particular, the collector nozzle can be provided with a metal envelope. The above-described arrangement efficiently prevents deteriorating the metal envelope with molten metal sticking thereon. [0021] According to another of its aspects, the invention relates to a pouring nozzle for use in an assembly forming a butt connection wherein the inner part of the pouring nozzle entry portion comprises:
- a first surface essentially frusto-conical, and
- dowstream from the first surface with respect to the molten metal flow, a second surface, and
- downstream from the second surface with respect to the molten metal flow, a third surface comprised in a plan orthogonal to the pouring axis.
[0022] According to yet another of its aspects, the invention also relates to a pouring nozzle used in an assembly forming a swivel connection wherein the inner part of the pouring nozzle entry portion comprises:
- a first surface (115) essentially frusto-conical, and - dowstream from the first surface with respect to the molten metal flow, a second surface, and
- downstream from the second surface with respect to the molten metal flow, a third surface, the third surface being concave.
[0023] Advantageously, the second surface of these pouring nozzles is an annular flat surface extending respectively all around the pouring nozzle bore. [0024] According to another of its aspects, the invention relates to a collector nozzle for use in the above described assembly wherein the collector nozzle comprises:
- a first surface essentially frusto-conical, and
- dowstream from the first surface with respect to the molten metal flow, a second surface, and
- downstream from the second surface with respect to the molten metal flow, a third surface and in that the collector nozzle is provided with a sealing gasket at the level of the second surface.
[0025] Preferably, the collector nozzle comprises retaining means or a retainer for the sealing gasket so that the collector nozzle can be manipulated or even held in position without risk for the sealing gasket to fall down. The sealing gasket can be fixedly attached to the collector nozzle, for example glued with an appropriate glue. Preferably however, the sealing gasket will be retained by a particular design or shape formed on the collector nozzle, at the level of the sealing surface. Such a shape can for example be a circular groove formed all around the collector nozzle or just a cylindrical portion allowing the sealing gasket to be forced in position. [0026] According to another embodiment, the invention relates to a collector nozzle for use in an assembly forming a butt connection. In this case, the third surafce of the collector nozzle is comprised in a plan orthogonal to the pouring axis.
[0027] According to yet another of its aspects, the invention also relates to a collector nozzle used in an assembly forming a swivel connection wherein the collector nozzle comprises:
- a first surface essentially frusto-conical, and - dowstream from the first surface with respect to the molten metal flow, a second surface and
- downstream from the second surface with respect to the molten metal flow, a third surface, the third surface being convex.
[0028] Advantageously, the sealing surface of these collector nozzles is an annular flat surface extending respectively all around the collector nozzle. [0029] With a view to better define the invention, it will now be described with reference to the Figs. 1 to 12 wherein:
Fig. 1 and 2 show cross-sectional views of prior art assemblies of a pouring nozzle and a collector nozzle;
Figs. 3, 8 and 9 show cross-sectional views of pouring nozzles for use in an assembly according to the invention (the bottom portion of the pouring nozzles is not shown);
Figs. 4 show an assembly according to the invention (with the pouring nozzle of Fig. 3 and the collector nozzle of Fig. 6);
Figs. 5, 6, 7 and 10 show cross-sectional views of collector nozzles for use in an assembly according to the invention (the top portion of the collector nozzles is not shown); Figs. 11 and 12 show perspective views of sealing gaskets which can be used in assemblies according to the invention.
[0030] Figs. 1 and 2 show thus prior art pouring nozzle and collector nozzle assemblies wherein the collector nozzle 2 is seen engaging the inner part of the pouring nozzle entry portion 11 which has shape 12 matching and complementary to the outer surface of the collector nozzle 2. Such assemblies can form butt (Fig. 1) or conical (Fig. 2) connections.
[0031] Visible on Figs. 3, 4, 8 and 9 are pouring nozzles; entry portion of the inner part of which 11 being adapted for matching engagement with a corresponding collector nozzle 20,30,40,50 outer shape. The inner part of the pouring nozzle entry portion 11 comprises a third surface or abutment surface 12,102,112 for a matching third surface or abutment surface 22,32,42,52 of the collector nozzle 20,30,40,50, and a second surface 13,103,113 matching a corresponding second surface 23,33,43,53 of the collector nozzle 20,30,40,50.
[0032] Fig. 4 shows an assembly according to the invention wherein the pouring nozzle of Fig. 3 has been assembled with the collector nozzle of Fig. 6. A sealing gasket 8 has been inserted between the collector nozzle 30 and the pouring nozzle at the level of their respective second surfaces 13,33. As can be seen, the downstream end of the collector nozzle 30 engages into the pouring nozzle until a certain point wherein its third surface 32 abuts against the third surface 12 of the pouring nozzle. At that point, the sealing gasket 8 is subjected to a predetermined pressure by the respective second surfaces 13,33 of the pouring nozzle and collector nozzle. It can also be noted that thanks to the frusto-conical first surface 15 of the pouring nozzle
(upstream from the second surface), the collector nozzle 30 cannot tilt beyond a predetermined angle due to the corresponding frusto-conical first surface 35 of the collector nozzle. Other forms of frusto-conical surfaces are shown on Figs. 8 and 9 as depicted by references 105 and 115. [0033] Figs. 5 to 7 and 10 show different embodiments of the collector nozzle 20,30,40,50. Their common features are the presence of the third or abutment surface 22,32,42,52 and the second surface 23,33,43,53. Also visible on these figures are the following optional features:
- the frusto-conical first surface 25,35,45,55 extending upstream from the second surface;
- the retainers 34 (cylindrical portion) or 44 (circular groove extending all around the collector nozzle 40 at the level of its second surface 43).
[0034] Also visible on Figs. 4 and 10 is a sealing gasket 8. Fig. 12 shows a perspective view of an annular sealing gasket (as also depicted on Fig. 4) which can be used for example with the collector nozzles 20,30,40 of Figs. 5 to 7 while Fig. 11 shows a perspective view of a frusto- conical sealing gasket (as also depicted on Fig. 10) which can be used for example with the collector nozzle 50 of Fig. 10.

Claims

Claims.
1. Assembly of a pouring nozzle for casting a molten metal from an upstream metallurgical vessel and of a collector nozzle (20,30,40,50) for said upstream metallurgical vessel, the inner shape of the pouring nozzle entry portion (11 ) being adapted for matching engagement with said collector nozzle (20,30,40,50) outer shape, characterized in that the inner part of the pouring nozzle entry portion (11) comprises
- a first surface (15) essentially frusto-conical matching a first surface (25,35,45,55,105,115) of the collector nozzle, and - downstream from the first surface with respect to the molten metal flow, a second surface (13,103,113) matching a corresponding second surface (23,33,43,53) of the collector nozzle (20,30,40,50), and
- dowstream from the second surface with respect to the molten metal flow, a third surface (12,102,112) matching a third surface (22,32,42,52) of the collector nozzle (20,30,40,50), and in that the first surface (15) of the pouring nozzle is spaced apart from the first surface (25,35,45,55,105,115) of collector nozzle (20,30,40,50), and in that the second surface (13,103,113) of the pouring nozzle is spaced apart from the second surface (23,33,43,53) of collector nozzle (20,30,40,50) and in that the third surface (12,102,112) of the pouring nozzle abuts the third surface (22,32,42,52) of the collector nozzle
(20,30,40,50),
2. Assembly according to claim 1 , characterized in that the corresponding second surfaces (103;53) of the pouring nozzle and collector nozzle (50) are frusto-conical.
3. Assembly according to claim 1, characterized in that the corresponding second surfaces (13,113;23,33,43) of the pouring nozzle and collector nozzle (20,30,40) are located in a plan orthogonal to the pouring axis (1).
4. Assembly according to claim 3, characterized in that the corresponding second surfaces (13,113,23,33,43) of the pouring nozzle and collector nozzle (20,30,40) are annular flat surfaces extending respectively all around the pouring nozzle bore and the collector nozzle.
5. Assembly according to any one of claims 1 to 4, characterized in that a sealing gasket (8) is inserted between the corresponding second surfaces (13,103,113;23,33,43,53) of the pouring nozzle and collector nozzle (20,30,40,50).
6. Assembly according to claim 5, characterized in that the sealing gasket (8) is made from graphite.
7. Assembly according to claim 5 or 6, characterized in that the collector nozzle (20,30,40,50) comprises a retainer for the sealing gasket (8).
8. Assembly according to claim 7, characterized in that the sealing gasket (8) is fixedly attached to the sealing surface of the collector nozzle (20,30,40,50).
9. Assembly according to claim 8, characterized in that the sealing gasket (8) is retained by a shape (34,44) formed in the outer surface of the collector nozzle (30,40).
10. Assembly according to any one of claims 1 to 9, characterized in that the third surfaces (12,22,32) of the pouring nozzle and of the collector nozzle (20,30) form a conical connection.
11. Assembly according to any one of claims 1 to 10, characterized in that the third surfaces (102;52) of the pouring nozzle and of the collector nozzle (50) form a butt connection.
12. Assembly according to any one of claims 1 to 11 , characterized in that the third surfaces (112;42) of the pouring nozzle and of the collector nozzle form a swivel connection.
13. Nozzle for use in an assembly according to claim 11 , characterized in that the inner part of the pouring nozzle entry portion (11 ) comprises
- a first surface (105) essentially frusto-conical, and
- dowstream from the first surface with respect to the molten metal flow, a second surface (103), and
- downstream from the second surface with respect to the molten metal flow, a third surface (102) comprised in a plan orthogonal to the pouring axis (1 ).
14. Nozzle for use in an assembly according to claim 12, characterized in that the inner part of the pouring nozzle entry portion (11 ) comprises
- a first surface (115) essentially frusto-conical, and
- dowstream from the first surface with respect to the molten metal flow, a second surface (113), and
- downstream from the second surface with respect to the molten metal flow, a third surface (112), the third surface being concave.
15. Nozzle according to any one of claims 13 to 14, characterized in that the second surface (103,113) is an annular flat surface extending respectively all around the pouring nozzle bore.
16. Collector nozzle (20,30,40,50) for use in an assembly according to any one of claims 1 to 12, characterized in that the collector nozzle comprises
- a first surface (25,35,45,55,105,115) essentially frusto-conical, and
- dowstream from the first surface with respect to the molten metal flow, a second surface (23,33,43,53), and
- downstream from the second surface with respect to the molten metal flow, a third surface (22,32,42,52) and in that the collector nozzle (20,30,40,50) is provided with a sealing gasket (8) at the level of the second surface (23,33,43,53).
17. Collector nozzle according to claim 16, characterized in that the collector nozzle (20,30,40,50) comprises a retainer for the sealing gasket (8).
18. Collector nozzle according to claim 17, characterized in that the sealing gasket (8) is fixedly attached, for example glued, to the sealing surface of the collector nozzle (20,30,40,50).
19. Collector nozzle according to claim 18, characterized in that the sealing gasket (8) is retained by a shape (34,44) formed in the outer surface of the collector nozzle (30,40).
20. Collector nozzle for use in an assembly according to claim 11 , characterized in that the collector nozzle (50) comprises
- a first surface (55) essentially frusto-conical, and
- dowstream from the first surface with respect to the molten metal flow, a second surface (53) and - downstream from the second surface with respect to the molten metal flow, a third surface (52), the third surface (52) being comprised in a plan orthogonal to the pouring axis (1 ) and in that the collector nozzle (50) is provided with a sealing gasket (8) at the level of the second surface (53).
21. Collector nozzle for use in an assembly according to claim 12, characterized in that the collector nozzle (40) comprises
- a first surface (45) essentially frusto-conical, and
- dowstream from the first surface with respect to the molten metal flow, a second surface (43) and
- downstream from the second surface with respect to the molten metal flow, a third surface (42), the third surface (42) being convex.
22. Collector nozzle according to any one of claims 16 to 21 , characterized in that the second surface (23,33,43) of the collector nozzle (20,30,40) is an annular flat surface extending all around the collector nozzle.
EP05778484A 2004-08-11 2005-08-05 Assembly of a pouring nozzle and collector nozzle Withdrawn EP1781436A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05778484A EP1781436A1 (en) 2004-08-11 2005-08-05 Assembly of a pouring nozzle and collector nozzle

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP04447185 2004-08-11
EP05778484A EP1781436A1 (en) 2004-08-11 2005-08-05 Assembly of a pouring nozzle and collector nozzle
PCT/BE2005/000125 WO2006015460A1 (en) 2004-08-11 2005-08-05 Assembly of a pouring nozzle and collector nozzle

Publications (1)

Publication Number Publication Date
EP1781436A1 true EP1781436A1 (en) 2007-05-09

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FI122541B (en) * 2009-01-15 2012-03-15 Indref Oy Alasuutiili
EP2444177A1 (en) * 2010-10-20 2012-04-25 Vesuvius Group S.A Pouring tube for liquid metal
EP2792433A1 (en) * 2013-04-16 2014-10-22 Refractory Intellectual Property GmbH & Co. KG A sealing system preferably in a slide gate on the spout of a metallurgical vessel and a spout casing
TWI633956B (en) * 2016-08-09 2018-09-01 Ａｋ鋼鐵資產公司 Tundish funnel,collector and casting machine
KR102171088B1 (en) * 2018-10-31 2020-10-28 주식회사 포스코 Molten metal supplying apparatus and method

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GB2094454B (en) * 1981-03-03 1984-09-19 Flogates Ltd Improvements in the pouring of molten metals
JP2860884B2 (en) * 1994-10-26 1999-02-24 東芝セラミックス株式会社 Refractory for controlling molten steel flow rate and sealing method thereof
JP4547556B2 (en) * 2002-09-27 2010-09-22 黒崎播磨株式会社 Immersion nozzle for continuous casting
JP2004268112A (en) * 2003-03-11 2004-09-30 Toshiba Ceramics Co Ltd Immersion nozzle for continuous casting

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