WO1997021511A1 - Ajutage doseur - Google Patents

Ajutage doseur Download PDF

Info

Publication number
WO1997021511A1
WO1997021511A1 PCT/GB1996/003031 GB9603031W WO9721511A1 WO 1997021511 A1 WO1997021511 A1 WO 1997021511A1 GB 9603031 W GB9603031 W GB 9603031W WO 9721511 A1 WO9721511 A1 WO 9721511A1
Authority
WO
WIPO (PCT)
Prior art keywords
insert
refractory
nozzle
component
composite
Prior art date
Application number
PCT/GB1996/003031
Other languages
English (en)
Inventor
Michael Anthony Roberts
Original Assignee
Flogates Limited
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 Flogates Limited filed Critical Flogates Limited
Priority to AU10692/97A priority Critical patent/AU1069297A/en
Publication of WO1997021511A1 publication Critical patent/WO1997021511A1/fr

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

Definitions

  • This invention relates to metering nozzles, and is more particularly concerned in one aspect with a metering nozzle for a tundish.
  • a conventional tundish for example, of the type used in continuous metal casting, will have a refractory lining and a metering nozzle located within a well nozzle or a seating block in or adjacent the lining of the tundish bottom.
  • the metering nozzle In use, the metering nozzle is subjected to very severe thermal and mechanical stresses during teeming, and erosion of the bore or flow passage of the nozzle is very rapid, leading to frequent replacement of the nozzle.
  • a nozzle change device which comprises a slide gate mechanism situated adjacent to the base of the tundish.
  • the nozzle change device is a simple form of slide gate valve which provides the facility to eject the metering nozzle (also called a collector nozzle) and replace it with a new metering nozzle.
  • the metering nozzle may be attached to, or integrally cast or moulded with, a fixed plate or a sliding plate of the nozzle change device, to permit controlled pouring of molten metal in a compact stream.
  • the metering nozzle is provided with an insert of a refractory material, which, though more expensive than the alumina used for the tundish lining, is more resistant to the thermal and'mechanical stresses involved in teeming.
  • inserts can be formed, for example, from zirconia, magnesite, or an alumina-earth composition.
  • the insert is separately produced, and the body of the nozzle moulded or cast therearound, and directly against the outer wall of the insert, such that the body of the nozzle surrounds the insert.
  • GB 1196993 discloses a refractory nozzle such as are used with a refractory stopper that is raised and lowered to start, stop and control the flow of molten metal from a ladle or from a tundish in continuous casting.
  • the nozzle comprises a liner extending over the whole length of the bore of a body. Interposed between the liner and body is a layer manufactured from a material having a degree of wear which is between that of the liner and the body.
  • a disadvantage of the present metering nozzles is the expense of the insert, since, in current designs, the insert is not replaceable. It would therefore be a great improvement if a metering nozzle could be produced wherein the worn insert could be replaced without the need to discard the entire nozzle.
  • an insert for a metering nozzle is provided with an outer refractory sheath component which permits more accurate control of the outer dimensions of the insert.
  • the invention provides a composite refractory insert for a melt containment vessel metering nozzle, which comprises a refractory inner component defining a flow passage for the melt, and a refractory outer component defining the outer diameter of the insert.
  • the invention provides a metering nozzle for a melt containment vessel, which comprises a refractory body provided with a hollow recess and a composite refractory insert positioned therein, the insert comprising a refractory inner component defining a flow passage for the melt, and a refractory outer component defining an outer dimension of the insert.
  • the invention provides a method for the manufacture of a metering nozzle for a melt containment vessel, which comprises forming a refractory nozzle body provided with a hollow recess, forming a composite refractory insert for the metering nozzle by providing an inner refractory component defining a flow passage for the melt and forming a refractory outer component therearound to define an outer dimension of the insert, such that the insert is a tight fit into the hollow recess, and cementing the insert into the hollow recess.
  • the invention provides a nozzle change device provided with a metering nozzle according to the invention.
  • the refractory outer component of the insert is cast around the inner refractory component in the form of a sheath, such that, on drying and curing, it exerts a shrinkage force on the inner refractory component.
  • the refractory inner 'component of the insert is selected from a first refractory material that has a high resistance to thermal and mechanical stresses. Zirconia is preferred, although other refractory materials, such as, magnesite and various refractory alumina-earth compositions are not excluded from the invention.
  • the inner component has a relatively constant wall thickness, and preferably a bell-shaped mouth and a corresponding bell-shaped outer periphery.
  • the refractory outer component can be formed from any suitable second refractory material, but usually comprises a refractory material different from that of the inner component.
  • the outer component is preferably formed from an alumina casting composition, or similar inexpensive casting or moulding material and is preferably cast or moulded as a sheath around the inner component, the outer wall of the outer component of the insert is preferably tapered, at least for part of its length, and is preferably provided with a step or shoulder positioned at a point or region along the length thereof.
  • the refractory inner component comprises zirconia, which has been formed by a pressing technique, for example, isostatic pressing, and the outer sheath component comprises a cast alumina composition.
  • a pressing technique for example, isostatic pressing
  • the outer sheath component comprises a cast alumina composition.
  • the metering nozzle body is preferably cast from a refractory alumina, or similar casting or moulding composition, using an appropriately shaped mandrel to form the hollow recess.
  • the casting technique enables a very good control of the dimensional tolerances of the hollow recess in the pre-formed body to be maintained.
  • the hollow recess of the nozzle body and the outer wall of the insert outer component are provided with cooperating shoulders which, when the insert is positioned in the recess, are spaced apart by a distance or from, for example, 2mm to 6mm, in order to provide a reservoir for the cement or mortar joining the nozzle body and the insert.
  • cement or mortar can be placed around the shoulder region and the components pressed together, forcing the cement from the shoulder region along the interface between the body and the composite insert.
  • the insert wears with usage.
  • a preferred embodiment provides a nozzle wherein said refractory body and said composite insert are arranged so as to be separable.
  • an embodiment provides a nozzle wherein said composite insert is replaceable.
  • Figures 1(a) and (b) show a prior art metering nozzle provided with a zirconia insert, respectively in sectional side elevation and end elevation.
  • Figures 2(a) and (b) show an insert for a metering nozzle according to the invention respectively in sectional side elevation and end elevation;
  • Figures 3(a) and (b) show a body for a metering nozzle according to the invention respectively in sectional side elevation and plan view;
  • Figures 4(a) and (b) show an assembled metering nozzle according to the invention respectively in sectional side elevation and plan view.
  • FIG. 1 there is shown a prior art metering nozzle illustrated generally at 1, having a tubular zirconia 'insert 2, with a melt flow passage or bore 3, and a nozzle body 4 formed from a castable alumina composition. Integrally formed with the nozzle body 4 is a base or plate 5, which is surrounded by a metal bush or bottom can 6.
  • FIG. 1 shows a composite insert according to the invention, illustrated generally at 10.
  • the insert comprises an inner zirconia component 11, having a bore 12 and an outer alumina sheath 13.
  • the inner component 11 is again formed by isostatic pressing of zirconia, and has a rather more bell-shaped mouth region, internally and externally, than the conventional zirconia insert.
  • the outer sheath component 13 is formed from a castable alumina composition and is cast directly onto the inner zirconia component of the insert 11. By casting in this way, it is possible to obtain very accurate outer dimensions for the outer sheath component 13, and, because the outer sheath component is cast directly onto the inner zircbnia component, on drying and curing it exerts a shrinkage force upon the inner zirconia component giving a tight joint and an improved thermal shock resistance.
  • the outer wall 17 of the sheath 13 is tapered from the mouth to the outlet, which enables the entire composite insert 10 to be knocked or pushed out of the nozzle body as will be described hereinbefore.
  • a suitable taper is from 89° to 80°, for example about 85°.
  • the outer wall 17 of the sheath 13 is also provided with a shoulder or step 16, having an angle of from about 110° to 140°, for example 120°, the function of which will also be described hereinafter.
  • the body 20 of the metering nozzle comprises a generally tubular portion 21 integrally formed with a rectangular plate 22, the latter being surrounded by a metal bottom can 23.
  • a tubular recess 24 in the nozzle body 20 is shaped to receive the composite insert 10 of Figure 2, having a tapering region 25 and a shoulder 26.
  • the body 20 can readily be formed by casting an alumina castable composition using a mandrel of outer configuration of, for example, approximately 2mm greater than the configuration of the composite insert 10.
  • the assembled metering nozzle is shown in Figure 4 and illustrated generally at 30.
  • the composite insert 10 is positioned within the recess 24 of the nozzle body 20, and, due to the tapering of the inner wall 25 of the body recess 24 and the outer wall 17 of the sheath 13, the insert 10 is a tight fit in the body 20.
  • Shoulders 16 and 26, respectively on the composite insert 10 and the body 20 are arranged such that, when the insert and body are assembled together, a small annular gap 31 remains between them.
  • mortar or cement Prior to assembly, mortar or cement is placed around either or both of shoulders 16 and 26 such that, on assembly of the composite insert and body, the mortar or cement is compressed in the annular gap 31 and spreads along the interface between the insert 10 and the body 20, forming a good bond and seal to prevent metal ingress.
  • the assembled metering nozzle can be placed in a nozzle change device as described hereinbefore. Whilst this is the preferred method of implementing the invention, it will be recognised that, in suitable circumstances, it would be possible to form a metering nozzle which could be located, for example, within the lining of a tundish bottom.

Abstract

Cet élément d'insertion réfractaire composite, destiné à un ajutage doseur d'une cuve contenant un bain de fusion, comprend un élément intérieur réfractaire délimitant un passage d'écoulement du bain de fusion, ainsi qu'un élément extérieur réfractaire délimitant une dimension extérieure de l'élément d'insertion. On peut placer cet élément d'insertion dans un évidement creux ménagé dans le corps d'un ajutage doseur, réfractaire et préformé.
PCT/GB1996/003031 1995-12-09 1996-12-09 Ajutage doseur WO1997021511A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU10692/97A AU1069297A (en) 1995-12-09 1996-12-09 Metering nozzle

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9525247.4 1995-12-09
GB9525247A GB2307876A (en) 1995-12-09 1995-12-09 Metering nozzle for a tundish

Publications (1)

Publication Number Publication Date
WO1997021511A1 true WO1997021511A1 (fr) 1997-06-19

Family

ID=10785223

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1996/003031 WO1997021511A1 (fr) 1995-12-09 1996-12-09 Ajutage doseur

Country Status (4)

Country Link
AU (1) AU1069297A (fr)
GB (1) GB2307876A (fr)
WO (1) WO1997021511A1 (fr)
ZA (1) ZA9610365B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19831983A1 (de) * 1998-07-16 2000-01-20 Lech Stahlwerke Gmbh Verfahren und Vorrichtung zum Befestigen eines Verschleißteils in einer Wechseldüse für einen Schiebeverschluß an metallurgischen Gefäßen

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI20060649L (fi) * 2006-07-04 2008-01-05 Indref Oy Metallisulan valutussuojaputki
FI122542B (fi) 2009-01-15 2012-03-15 Indref Oy Liukusuljinlevyn ja alasuutiilen yhdistelmä ja menetelmä liukusuljinlevyn ja alasuutiilen yhdistelmän korjaamiseksi
CN104829251B (zh) * 2015-04-21 2017-10-31 西安建筑科技大学 氧化铈微粉制备氧化锆质定径水口的方法及设备

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1196993A (en) * 1968-05-11 1970-07-01 Dyson Ltd J & J Improvements in Refractory Nozzles
US4497473A (en) * 1981-11-05 1985-02-05 Glaverbel Composite refractory articles and method of manufacturing them
GB2157210A (en) * 1984-04-03 1985-10-23 Didier Werke Ag Refractory immersion nozzles
GB2220875A (en) * 1988-01-27 1990-01-24 Vesuvius France Sa Integral slide-valve member and casting tube member
FR2643001A1 (fr) * 1989-01-05 1990-08-17 Vesuvius Sa Organe de coulee comportant une surface plane de glissement pour une plaque tiroir associee
US4951929A (en) * 1989-04-06 1990-08-28 Didier-Taylor Refractories Corporation Refractory assembly including inner and outer refractory members with interference shrink fit therebetween and method of formation thereof
EP0492231A2 (fr) * 1990-12-19 1992-07-01 Didier-Werke Ag Busette de coulée immergée

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3395840A (en) * 1966-07-15 1968-08-06 Vesuvius Crucible Co Nozzle for a bottom pour ladle for molten metal
GB2065517B (en) * 1979-12-15 1984-07-11 Steetley Refractories Ltd Assemblies for uphill teeming
JPS5785658A (en) * 1980-11-14 1982-05-28 Nippon Steel Corp Nozzle for casting
IT1172313B (it) * 1983-07-27 1987-06-18 Centro Speriment Metallurg Perfezionamento negli scaricatori per il colaggio di acciai calmati all'alluminio
US4568007A (en) * 1984-01-23 1986-02-04 Vesuvius Crucible Company Refractory shroud for continuous casting
AU593997B2 (en) * 1987-09-03 1990-02-22 Sumitomo Metal Industries Ltd. A nozzle for discharging molten metal used in a casting device
US5137189A (en) * 1989-09-20 1992-08-11 North American Refractories Company Porous refractory nozzle and method of making same
US5186886A (en) * 1991-09-16 1993-02-16 Westinghouse Electric Corp. Composite nozzle assembly for conducting a flow of molten metal in an electromagnetic valve
JP2721775B2 (ja) * 1992-11-10 1998-03-04 品川白煉瓦 株式会社 溶鋼鋳造用下ノズル

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1196993A (en) * 1968-05-11 1970-07-01 Dyson Ltd J & J Improvements in Refractory Nozzles
US4497473A (en) * 1981-11-05 1985-02-05 Glaverbel Composite refractory articles and method of manufacturing them
GB2157210A (en) * 1984-04-03 1985-10-23 Didier Werke Ag Refractory immersion nozzles
GB2220875A (en) * 1988-01-27 1990-01-24 Vesuvius France Sa Integral slide-valve member and casting tube member
FR2643001A1 (fr) * 1989-01-05 1990-08-17 Vesuvius Sa Organe de coulee comportant une surface plane de glissement pour une plaque tiroir associee
US4951929A (en) * 1989-04-06 1990-08-28 Didier-Taylor Refractories Corporation Refractory assembly including inner and outer refractory members with interference shrink fit therebetween and method of formation thereof
EP0492231A2 (fr) * 1990-12-19 1992-07-01 Didier-Werke Ag Busette de coulée immergée

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19831983A1 (de) * 1998-07-16 2000-01-20 Lech Stahlwerke Gmbh Verfahren und Vorrichtung zum Befestigen eines Verschleißteils in einer Wechseldüse für einen Schiebeverschluß an metallurgischen Gefäßen

Also Published As

Publication number Publication date
ZA9610365B (en) 1997-09-23
AU1069297A (en) 1997-07-03
GB2307876A (en) 1997-06-11
GB9525247D0 (en) 1996-02-07

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