EP0074988B1 - Tampon de coulee, monobloc en une piece - Google Patents

Tampon de coulee, monobloc en une piece Download PDF

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Publication number
EP0074988B1
EP0074988B1 EP19820900977 EP82900977A EP0074988B1 EP 0074988 B1 EP0074988 B1 EP 0074988B1 EP 19820900977 EP19820900977 EP 19820900977 EP 82900977 A EP82900977 A EP 82900977A EP 0074988 B1 EP0074988 B1 EP 0074988B1
Authority
EP
European Patent Office
Prior art keywords
stopper
mould
refractory material
zirconia
foundry
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.)
Expired
Application number
EP19820900977
Other languages
German (de)
English (en)
Other versions
EP0074988A1 (fr
Inventor
James Menzies c/o Thor Ceramics Limited THORNTON
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.)
Didier Werke AG
Original Assignee
Individual
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=10520814&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0074988(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Individual filed Critical Individual
Priority to AT82900977T priority Critical patent/ATE14999T1/de
Publication of EP0074988A1 publication Critical patent/EP0074988A1/fr
Application granted granted Critical
Publication of EP0074988B1 publication Critical patent/EP0074988B1/fr
Expired 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 monoblock one-piece pouring stoppers which are used as valve closures to control the outflow of molten metal through bottom pouring nozzles in foundry ladles or tun dishes in the iron and steel industry.
  • Each monoblock pouring stopper is made from a refractory material such as graphitized alumina or clay graphite.
  • stoppers have been made in 2 pieces i.e. an extruded clay graphite body with a screwed on nose cap, which could have a different composition to improve wear resistance.
  • the nose caps wear quickly due to erosion by the pressure of the outflowing melt through the nozzle of the tun dish or ladle and it has been proposed to improve the wear characteristics of the nose cap by the addition of fused or calcined alumina to the refractory mix formula.
  • French Patent No. 2292542 there is disclosed a corrosion-resistant stopper or nozzle which is wholly composed of a zirconium sand in admixture with natural graphite and silicon.
  • the stopper or nozzle is manufactured by the isostatic pressing method.
  • a one-piece monoblock stopper having a body formed from a refractory material and a foundry resin and an integral armoured nose portion comprising a higher refractory material selected from calcined alumina, fused alumina, magnesite and zirconia bound with a foundry resin.
  • the most preferred higher refractory additive material is stabilised or unstabilised zirconia.
  • a method of manufacturing a one-piece monoblock stopper by moulding the stopper from a refractory material and a foundry resin binder in a mould, compressing the contents of the mould by an isostatic process and firing the compressed contents to form a one-piece monoblock stopper, characterised in that said method includes the step of providing at the noseforming region of the mould a quantity of a higher refractory material selected from calcined alumina, fused alumina, magnesite and zirconia, together with a foundry resin binder so as to form, after compressing and firing a stopper having an integral armoured nose portion.
  • the mould is an isostatic pressing mould and compression of the contents thereof is effected by an isostatic pressing apparatus.
  • the method comprises charging the isostatic pressing mould with graphitized alumina bonded with a foundry type resin to a level short of the full capacity of the mould and filling the remaining volume with a mix of zirconia and a foundry resin as bonding agent.
  • a one-piece monoblock pouring stopper according to this embodiment of the invention is formed by a high intensity mixing of graphite and alumina powder together with foundry resin as bonding agent to form a homogeneous mix and charging the mix to a normal isostatic pressing mould to a level short of the full capacity of the mould.
  • the mould is sealed and immersed in water and subjected to isostatic pressing.
  • the compressed contents of the mould are then fired to form a one-piece monoblock stopper provided with an integral armoured nose portion of zirconia which is more highly resistant to erosion.
  • a stopper has an extended working life.
  • a one-piece monoblock stopper 1 having an armoured nose portion 2 is fixed by conventional means to a cross arm control member 3 above the pouring nozzle 4 of a tun-dish 5.
  • the armoured nose portion 2 of the stopper 1 increases or reduces the outflow volume of molten metal 6 through the pouring nozzle 4 into a continuous casting mould 7 wherein the molten metal begins to solidify to a mass 8 suitable for subsequent rolling.
  • the aperture 9, allows the optional step of injection of argon gas through the stopper into the metal, may not be present in other embodiments so as to leave a thick solid armoured nose. This solid coating is advantageous in cases of severe wear.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Claims (6)

1. Procédé de fabrication d'un tampon monobloc en une seule pièce (1) par moulage du tampon (1) à patir d'un matériau réfractaire et d'un liant constitué par une résine de fonderie dans un moule, compression du contenu du moule par un procédé isostatique et cuisson du contenu comprimé pour former un tampon monobloc en une pièce (1), caractérisé en ce que ledit procédé comprend une étape de fourniture, dans la zone de formage de l'extrémité du tampon, d'une quantité d'un matériau plus réfractaire, choisi parmi les alumine calcinée, alumine fondue, magnésite et zircone, avec un liant constitué par une résine de fonderie de manière à former, après compression et cuisson, un tampon ayant une portion terminale blindée d'un seul tenant (2).
2. Procédé suivant la revendication 1, selon lequel le moule est un moule de compression isostatique et la compression du contenu du moule est effectuée par un appareil de compression isostatique.
3. Procédé suivant la revendication 2, selon lequel le moule de compression isostatique est chargé avec de l'alumine graphitée liée avec une résine de type fonderie à un niveau proche de la capacité totale du moule et en ce que le reste du volume est rempli avec un mélange de zircone et de résine de fonderie comme agent liant.
4. Tampon monobloc d'un seul tenant (1) ayant un corps formé à partir d'un matériau réfractaire et d'une résine de fonderie, et une portion terminale blindée d'un seul tenant (2) comprenant un matériau plus réfractaire choisi parmi les alumine calcinée, alumine fondue, magnésite et zircone, lié avec une résine de fonderie.
5. Tampon suivant la revendication 4, dans lequel la portion terminale comprend de la zircone stabilisée ou non stabilisée, liée avec une résine de fonderie.
6. Tampon suivant la revendication 4 ou la revendication 5, dans lequel la partie terminale du tampon présente une ouverture (9).
EP19820900977 1981-04-01 1982-04-01 Tampon de coulee, monobloc en une piece Expired EP0074988B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82900977T ATE14999T1 (de) 1981-04-01 1982-04-01 Verbesserte einteilige stopfenstange.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8110120 1981-04-01
GB8110120 1981-04-01

Publications (2)

Publication Number Publication Date
EP0074988A1 EP0074988A1 (fr) 1983-03-30
EP0074988B1 true EP0074988B1 (fr) 1985-08-21

Family

ID=10520814

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820900977 Expired EP0074988B1 (fr) 1981-04-01 1982-04-01 Tampon de coulee, monobloc en une piece

Country Status (4)

Country Link
EP (1) EP0074988B1 (fr)
AU (1) AU8276082A (fr)
DE (1) DE3265542D1 (fr)
WO (1) WO1982003349A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8411596D0 (en) * 1984-05-05 1984-06-13 Thor Ceramics Ltd Stopper
DE3545763A1 (de) * 1985-12-21 1987-06-25 Didier Werke Ag Gasspuelstopfen fuer ein schmelzengefaess
JPH01166877A (ja) * 1987-12-23 1989-06-30 Shinagawa Refract Co Ltd スライドバルブ装置用インサートノズル開口具及び開口方法
DE4125916A1 (de) * 1991-08-05 1993-02-11 Didier Werke Ag Verfahren zum induktiven aufheizen von keramischen formteilen
GB9310143D0 (en) * 1993-05-15 1993-06-30 Thor Ceramics Ltd Stopper
GB9817645D0 (en) * 1998-08-14 1998-10-07 Didier Werke Ag Stopper

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3632026A (en) * 1969-01-27 1972-01-04 Vesuvius Crucible Co Stopper structure and combination of bottom pour receptacle and stopper
JPS583992B2 (ja) * 1974-11-30 1983-01-24 ニホンルツボ カブシキガイシヤ レンゾクチユウゾウヨウシンセキノズル
DE2646707C3 (de) * 1976-10-13 1984-01-26 Mannesmann AG, 4000 Düsseldorf Tauchausguß aus feuerfestem Werkstoff für das Stranggießen von Stahl
FR2464769A1 (fr) * 1979-09-10 1981-03-20 Akechi Taikarenga Kk Busette a immersion pour la coulee continue d'acier

Also Published As

Publication number Publication date
EP0074988A1 (fr) 1983-03-30
AU8276082A (en) 1982-10-19
DE3265542D1 (en) 1985-09-26
WO1982003349A1 (fr) 1982-10-14

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