EP0453079A1 - Dispositif de canal de coulée avec une buse de coulée - Google Patents

Dispositif de canal de coulée avec une buse de coulée Download PDF

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Publication number
EP0453079A1
EP0453079A1 EP91301900A EP91301900A EP0453079A1 EP 0453079 A1 EP0453079 A1 EP 0453079A1 EP 91301900 A EP91301900 A EP 91301900A EP 91301900 A EP91301900 A EP 91301900A EP 0453079 A1 EP0453079 A1 EP 0453079A1
Authority
EP
European Patent Office
Prior art keywords
launder
nozzle
filter
assembly
molten metal
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Withdrawn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
EP91301900A
Other languages
German (de)
English (en)
Inventor
Paul Wellington Lake
Gordon John Spencer Higginbotham
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.)
Rolls Royce PLC
Original Assignee
Rolls Royce PLC
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 Rolls Royce PLC filed Critical Rolls Royce PLC
Publication of EP0453079A1 publication Critical patent/EP0453079A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • B22C9/086—Filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D35/00—Equipment for conveying molten metal into beds or moulds
    • 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

  • the present invention relates to launder systems for supplying molten metal from a source of molten metal to a casting mould or a secondary process, and is particularly concerned with the launder nozzle.
  • One way of achieving this is to provide one or more dams or weirs in the launder to trap the inclusions. However, some inclusions can still be carried through to the casting mould or secondary process.
  • Another way of achieving this is to provide a fixed filter in the launder. This is more efficient at cleaning the molten metal than the dams.
  • the provision of the filter in the launder increases the possibility of blockages occurring which can result in the scrapping and remaking of the launder.
  • a ceramic lining is cemented into the launder, and is normally replaced after each casting operation.
  • a ceramic lining is provided, and it is usual practice with such crucibles to have a wash out melt which cleans the surface of the ceramic lining and removes any loose debris.
  • the present invention seeks to provide a launder system in which the launder may be used more than once to gain benefit from their ceramic linings and to incorporate a filter.
  • the present invention provides a launder system for supplying molten metal from a source of molten metal to a casting mould or a secondary process comprising a nozzle arranged, in operation, to supply the molten metal from the launder to the casting mould or the secondary process, and a filter arranged within the nozzle to filter the molten metal as it flows through the nozzle, the nozzle and filter assembly being removably attached to the launder.
  • a changing means may be arranged to remove a first used nozzle and filter assembly from the launder and to install a second unused nozzle and filter assembly into the launder.
  • the filter is a reticulated foam filter.
  • the launder and nozzle having mating faces, the mating faces may have sealing mean to prevent the leakage of molten metal.
  • the sealing means may comprise interengaging grooves and lands on the mating faces.
  • the sealing means may comprise a refractory wadding on either of the mating surfaces.
  • the launder may have a ceramic lined channel.
  • the filter may be integral with the nozzle.
  • Heating means may be provided to heat the nozzle and filter assembly.
  • the heating means comprises an at least one electrical induction coil.
  • an electrically conducting ring is located within the electrical induction coil, and is arranged around the nozzle.
  • the present invention also provides a launder nozzle comprising a filter arranged such that in use it filters molten metal as it flows through the nozzle.
  • the filter is a reticulated foam filter.
  • the filter may be integral with the nozzle.
  • Figure 1 a crucible 10 which contains molten metal 14.
  • the crucible 10 has a lining 12 of ceramic material.
  • the crucible 10 is arranged to supply the molten metal 14 to one or more casting moulds or a secondary process via a launder system 16.
  • the secondary process may be an atomisation process for coating articles or depositing the atomised particles on a former to create an article or to create metallic powder.
  • the launder system 16 comprises one or more channel members 18 which have linings 20 of ceramic material.
  • the launder system 16 also comprises one or more nozzles 22 which supply the molten metal from the launder channel members 18 to the casting moulds or secondary process.
  • Each nozzle 22 has a ceramic lining 24 and is provided with a filter 26 which is positioned within the nozzle 22.
  • the filter 26 is arranged to filter the molten metal as it flows through the nozzle 22 from the launder channel members 18 to the casting mould or secondary process.
  • the nozzle 22 and filter 26 assembly is removably attachable to the launder channel member 18 by suitable means, so that after the nozzle and filter assembly has been used once it is then replaced by a new nozzle and filter assembly.
  • the provision of the removable nozzle and filter assembly allows efficient cleaning of the molten metal without the disadvantage of an increased possibility of blockage. This reduces the scrapping rate and hence allows the launder assembly to be used many times to gain maximum benefit from the ceramic lining.
  • An electrical induction heating coil 38 is located coaxially around the nozzle 22 and filter 26 assembly, to directly heat the molten metal as it flows through the nozzle 22 and filter 26 assembly to reduce the possibility of the metal solidifying in the nozzle 22 or filter 26. It may be desirable to use several induction heating coils positioned coaxially around the nozzle and filter assembly, especially induction coils of different diameters to correspond with portions of the nozzle 22 having different outer diameters.
  • An electrically conducting ring 40, a susceptor is located coaxially within the induction heating coil 38, and coaxially around the nozzle 22 and filter 26 assembly. The electrically conducting ring 40 is heated by the electrical induction coil 38, and then the electrically conducting ring 40 radiates heat to heat the nozzle 22 and filter 26 assembly.
  • the induction coil used together with the susceptor may be used to preheat the nozzle and filter assembly, before molten metal flows therethrough, whereas the induction coil alone cannot preheat the nozzle and filter assembly.
  • the electrically conducting ring 40 in this example is a graphite ring.
  • the electrically conducting ring 40 contacts the nozzle 22 in Figure 1, however the ring 40 may be spaced from the nozzle 22.
  • an electrical induction heating coil has been shown in the figure, a radiant heater, for example an electrical resistance heater, may be used to heat the nozzle and filter assembly. Radiant heaters may also be used to preheat the nozzle and filter assembly before molten metal flows therethrough, to prevent or reduce the possibility of the molten metal solidifying in the nozzle and filter assembly.
  • the nozzle 22 is manufactured using appropriate ceramic moulding technology, for example isostatic pressing or injection moulding followed by sintering, although other suitable methods may be used, for example shell moulding, and the filter 26 is a reticulated foam filter although other suitable filters may be used.
  • a mechanism to allow quick changing of the nozzle and filter assemblies may be provided to remove a used nozzle and filter assembly and to install a new unused nozzle and filter assembly.
  • the quick change mechanism may comprise an arm which has first and second ends.
  • the arm is pivotally mounted at its first end about a vertical axis, and the second end is arranged to releasably hold the nozzle and filter assembly.
  • the arm is simply rotated about its pivotal axis between a first position and a second position. In the first position a new unused nozzle and filter assembly is located in the second end of the arm, the arm is then rotated to the second position to position the new nozzle and filter assembly underneath the launder for use. The arm is then rotated back to the first position, to allow the used nozzle and filter assembly to be removed and, to allow a further new nozzle and filter assembly to be used.
  • the quick change mechanism could equally well comprise a number of arms pivotally mounted at their first ends about the same vertical axis, each of the arms has a second end to releasably hold a nozzle and filter assembly.
  • the quick change mechanism could alternately comprise a reciprocatory arm.
  • FIG. 2 A portion of the launder channel member 18 and the nozzle 22 is shown in figure 2, the mating face of the launder channel member 18 has lands 32 and grooves 34 which interengage with grooves 28 and lands 30 respectively on the mating face of the nozzle 22 to form a seal.
  • the upper end of the nozzle 22 fits into a recess 19 on the underside of the launder 18.
  • the nozzle 22 is pushed into the recess 19 to be located with respect to the launder 18, and is pulled out of the recess 19 for removal.
  • the nozzle 22 is held stationary by the clamping action between the launder 18 and the arm of the changing mechanism.
  • FIG. 3 An alternative seal is shown in figure 3, in which a refractory wadding 36 is positioned between the mating surfaces of the launder channel member 18 and the nozzle 22.
  • the filter is a separate element from the nozzle as shown in the Figures, it may alternatively be formed integrally with the nozzle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
EP91301900A 1990-04-17 1991-03-07 Dispositif de canal de coulée avec une buse de coulée Withdrawn EP0453079A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB909008538A GB9008538D0 (en) 1990-04-17 1990-04-17 A launder system for supplying molten metal and a launder nozzle
GB9008538 1990-04-17

Publications (1)

Publication Number Publication Date
EP0453079A1 true EP0453079A1 (fr) 1991-10-23

Family

ID=10674481

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91301900A Withdrawn EP0453079A1 (fr) 1990-04-17 1991-03-07 Dispositif de canal de coulée avec une buse de coulée

Country Status (3)

Country Link
EP (1) EP0453079A1 (fr)
JP (1) JPH04228257A (fr)
GB (1) GB9008538D0 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
EP2462250A4 (fr) * 2009-08-06 2013-10-09 Rolls Royce Corp Dispositif à filtre pour liquide

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011087392A1 (fr) * 2010-01-18 2011-07-21 Kobzar-Dernovskiy Vladimir Evgenjevich Dispositif de type manche à gaz pour raffinage, dégazage et coulage de métal depuis une poche de coulée sans arrêtoir ni trappe
WO2011102748A1 (fr) * 2010-02-19 2011-08-25 Kobzar-Dernovskiy Vladimir Evgenjevich Procédé et dispositif de production d'acier et de coulée continue de ce dernier
WO2014047745A1 (fr) * 2012-09-27 2014-04-03 宝山钢铁股份有限公司 Procédé et dispositif de coulée continue de bandes minces

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT19213B (fr) * 1904-02-29 1905-02-25 Carl Franze
DE865942C (de) * 1941-10-14 1953-02-05 Siegfried Dr-Ing E H Junghans Heizbare Rinne zum Giessen von Metallen und Legierungen nach dem Stranggiessverfahren
DE3048220A1 (de) * 1980-01-24 1981-09-24 Stopinc AG, 6340 Baar "einrichtung zum vergiessen von metallschmelzen"
EP0234572A1 (fr) * 1986-02-27 1987-09-02 Asea Ab Récipient métallurgique
EP0317500A1 (fr) * 1987-11-16 1989-05-24 Alusuisse-Lonza Services Ag Dispositif pour la coulée de métal fondu

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT19213B (fr) * 1904-02-29 1905-02-25 Carl Franze
DE865942C (de) * 1941-10-14 1953-02-05 Siegfried Dr-Ing E H Junghans Heizbare Rinne zum Giessen von Metallen und Legierungen nach dem Stranggiessverfahren
DE3048220A1 (de) * 1980-01-24 1981-09-24 Stopinc AG, 6340 Baar "einrichtung zum vergiessen von metallschmelzen"
EP0234572A1 (fr) * 1986-02-27 1987-09-02 Asea Ab Récipient métallurgique
EP0317500A1 (fr) * 1987-11-16 1989-05-24 Alusuisse-Lonza Services Ag Dispositif pour la coulée de métal fondu

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
FR2739313A1 (fr) * 1995-09-28 1997-04-04 Usinor Sacilor Busette pour l'introduction d'un metal liquide dans une lingotiere de coulee continue des metaux
US5733469A (en) * 1995-09-28 1998-03-31 Usinor Sacilor Nozzle for introducing a liquid metal into a mold for continuous casting of metals
CN1064286C (zh) * 1995-09-28 2001-04-11 于西纳公司 把液体金属引入金属连铸模具的喷嘴
EP2462250A4 (fr) * 2009-08-06 2013-10-09 Rolls Royce Corp Dispositif à filtre pour liquide
US10076784B2 (en) 2009-08-06 2018-09-18 Rolls-Royce Corporation Liquid device having filter

Also Published As

Publication number Publication date
JPH04228257A (ja) 1992-08-18
GB9008538D0 (en) 1990-06-13

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