EP0625391A1 - Mit Nuten versehener Stopfen - Google Patents

Mit Nuten versehener Stopfen Download PDF

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Publication number
EP0625391A1
EP0625391A1 EP94302374A EP94302374A EP0625391A1 EP 0625391 A1 EP0625391 A1 EP 0625391A1 EP 94302374 A EP94302374 A EP 94302374A EP 94302374 A EP94302374 A EP 94302374A EP 0625391 A1 EP0625391 A1 EP 0625391A1
Authority
EP
European Patent Office
Prior art keywords
stopper
stopper rod
grooves
rod
axial
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Withdrawn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
EP94302374A
Other languages
English (en)
French (fr)
Inventor
Stephen John Lee
William Muir
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.)
Thor Ceramics Ltd
Original Assignee
Thor Ceramics Ltd
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 Thor Ceramics Ltd filed Critical Thor Ceramics Ltd
Publication of EP0625391A1 publication Critical patent/EP0625391A1/de
Withdrawn legal-status Critical Current

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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
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures
    • B22D41/16—Closures stopper-rod type, i.e. a stopper-rod being positioned downwardly through the vessel and the metal therein, for selective registry with the pouring opening
    • B22D41/18—Stopper-rods therefor
    • B22D41/186—Stopper-rods therefor with means for injecting a fluid into the melt

Definitions

  • This invention relates to a stopper used as part of a valve mechanism in the control of flow of molten material from a vessel through a submerged outlet. More particularly, it relates to refractory monoblock stoppers, i.e. one piece ceramic stopper rods as currently used to control the flow of molten metal exiting from a nozzle mounted in the bottom of a melt-containing vessel, e.g. ladle or tundish. This is typically applied in the casting of steel through an opening in the base of the tundish via nozzles and shrouds into a water-cooled mould.
  • refractory monoblock stoppers i.e. one piece ceramic stopper rods as currently used to control the flow of molten metal exiting from a nozzle mounted in the bottom of a melt-containing vessel, e.g. ladle or tundish. This is typically applied in the casting of steel through an opening in the base of the tundish via nozzles and shrouds into a water-cooled mould.
  • stoppers consist of an elongate cylindrical refractory ceramic body of isostatically-pressed graphite/alumina having at the lower end a rounded or tapered profile suitable for engagement in the throat of a corresponding exit nozzle, and at the upper end some form of connecting means to fasten the stopper onto an external lifting mechanism by which the flow is controlled.
  • stopper Operation of the stopper is simple in principle.
  • a mechanical lifting system is used to vertically lift the stopper rod from a seating position on the nozzle to ease or restrict the volume of the molten metal flowing through the nozzle.
  • such a stopper rod has to operated under harsh environmental conditions such as being submerged in the molten metal for long periods of time and must be able to withstand the high thermal shocks encountered in the pouring processes.
  • the present invention aims to provide an improved stopper.
  • a refractory monoblock stopper of substantially cylindrical configuration having an axial bore provided therethrough for the passage of an inert gas, the outer surface of the stopper rod being provided with an odd number of axial grooves thereby reducing the weight of the stopper without loss of strength.
  • the grooves in the outer surface of the stopper rod are concave in cross-section.
  • 3 or 5 grooves are equispaced in the outer surface of the stopper rod.
  • this invention provides a refractory monoblock stopper which is characterised in that the exterior surface of the stopper has an undulating contour comprising alternate lobes and recesses to provide a fluted design which surprisingly retains the strength of a regular cylindrical stopper as known for example from EP-A-0074988 or EP-A-0179837 yet results in significant savings in material.
  • the stopper rod 1 for use in the control of flow of moulten material from a tundish or vessel (not shown).
  • the stopper rod 1 comprises a refractory body having an axial bore 2 having a restricted section 3 in the lower region of the stopper rod.
  • An inert gas such as Argon is fed from a gas supply, through a transverse bore 4 in the upper region of the stopper rod into the axial bore 2.
  • the outer surface of the stopper rod 1 is provided with a plurality of axial concave grooves 5. Five grooves are shown in Figure 2 although 3 grooves may alternatively be used.
  • the grooves 5 are equispaced around the outer surface of the stopper rod 1.
  • the grooves produce regions of reduced thickness in the stopper rod 1.
  • An odd number of grooves 5 are provided to ensure that each region of reduced thickness of the stopper rod is diametrically opposite to a solid portion of the stopper rod so as to ensure that it can withstand the harsh working conditions placed upon it.
  • the grooves 5 provided in the surface of the stopper rod 1 result in the reduction of the tendency for a swirling vortex to be created around the stopper rod and thence down the exit nozzle of the tundish or vessel.
  • the above described stopper rod allows the tundish to be emptied to a lower level before any surface slag or impurities are drawn down the nozzle and into the mould which would reduce the cast product quality. The yield from each tundish can therefore, be increased.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
EP94302374A 1993-05-15 1994-03-31 Mit Nuten versehener Stopfen Withdrawn EP0625391A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB939310143A GB9310143D0 (en) 1993-05-15 1993-05-15 Stopper
GB9310143 1993-05-15

Publications (1)

Publication Number Publication Date
EP0625391A1 true EP0625391A1 (de) 1994-11-23

Family

ID=10735620

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94302374A Withdrawn EP0625391A1 (de) 1993-05-15 1994-03-31 Mit Nuten versehener Stopfen

Country Status (2)

Country Link
EP (1) EP0625391A1 (de)
GB (1) GB9310143D0 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002100578A1 (en) * 2001-06-08 2002-12-19 Vesuvius Crucible Company Stopper rod
RU2508960C2 (ru) * 2008-11-19 2014-03-10 Рифрэктори Интеллектуал Проперти Гмбх Унд Ко. Кг Корпус стопора
WO2017162263A1 (en) * 2016-03-21 2017-09-28 Refractory Intellectual Property Gmbh & Co. Kg Ceramic refractory stopper

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH294260A (de) * 1951-07-06 1953-10-31 Hofer Weiss Otto Einrichtung zum schlackenfreien Giessen.
WO1982003349A1 (en) * 1981-04-01 1982-10-14 James Menzies Thornton Improved monoblock one-piece pouring stopper
WO1985005056A1 (en) * 1984-05-05 1985-11-21 Thor Ceramics Limited Stopper for use in molten metal handling
US4799650A (en) * 1987-09-23 1989-01-24 Labate Michael D Slag retaining device with vortex inhibitor
FR2681804A1 (fr) * 1991-09-27 1993-04-02 Boulonnais Terres Refractaires Perfectionnement apportes aux obturateurs du trou de coulee d'un convertisseur.

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH294260A (de) * 1951-07-06 1953-10-31 Hofer Weiss Otto Einrichtung zum schlackenfreien Giessen.
WO1982003349A1 (en) * 1981-04-01 1982-10-14 James Menzies Thornton Improved monoblock one-piece pouring stopper
EP0074988A1 (de) * 1981-04-01 1983-03-30 Thornton James Menzies Verbesserte einteilige stopfenstange.
WO1985005056A1 (en) * 1984-05-05 1985-11-21 Thor Ceramics Limited Stopper for use in molten metal handling
EP0179837A1 (de) * 1984-05-05 1986-05-07 Thor Ceramics Ltd Stopfen zum gebrauch beim behandeln von flüssigen metallen.
US4799650A (en) * 1987-09-23 1989-01-24 Labate Michael D Slag retaining device with vortex inhibitor
FR2681804A1 (fr) * 1991-09-27 1993-04-02 Boulonnais Terres Refractaires Perfectionnement apportes aux obturateurs du trou de coulee d'un convertisseur.

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002100578A1 (en) * 2001-06-08 2002-12-19 Vesuvius Crucible Company Stopper rod
US6913730B2 (en) 2001-06-08 2005-07-05 Vesuvius Crucible Company Stopper rod
CZ300696B6 (cs) * 2001-06-08 2009-07-22 Vesuvius Crucible Company Zátková tyc
RU2508960C2 (ru) * 2008-11-19 2014-03-10 Рифрэктори Интеллектуал Проперти Гмбх Унд Ко. Кг Корпус стопора
WO2017162263A1 (en) * 2016-03-21 2017-09-28 Refractory Intellectual Property Gmbh & Co. Kg Ceramic refractory stopper
CN109070204A (zh) * 2016-03-21 2018-12-21 里弗雷克特里知识产权两合公司 陶瓷耐火塞
RU2707363C1 (ru) * 2016-03-21 2019-11-26 Рифрэктори Интеллектчуал Проперти Гмбх Унд Ко. Кг Керамическая огнеупорная пробка
US11033957B2 (en) * 2016-03-21 2021-06-15 Refractory Intellectual Property Gmbh & Co. Kg Ceramic refractory stopper

Also Published As

Publication number Publication date
GB9310143D0 (en) 1993-06-30

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