WO1982003349A1 - Improved monoblock one-piece pouring stopper - Google Patents

Improved monoblock one-piece pouring stopper Download PDF

Info

Publication number
WO1982003349A1
WO1982003349A1 PCT/GB1982/000102 GB8200102W WO8203349A1 WO 1982003349 A1 WO1982003349 A1 WO 1982003349A1 GB 8200102 W GB8200102 W GB 8200102W WO 8203349 A1 WO8203349 A1 WO 8203349A1
Authority
WO
WIPO (PCT)
Prior art keywords
mould
stopper
monoblock
bonding agent
zirconia
Prior art date
Application number
PCT/GB1982/000102
Other languages
French (fr)
Inventor
James Menzies Thornton
Original Assignee
James Menzies Thornton
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=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO1982003349(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by James Menzies Thornton filed Critical James Menzies Thornton
Priority to DE8282900977T priority Critical patent/DE3265542D1/en
Priority to DE1982900977 priority patent/DE74988T1/en
Priority to AT82900977T priority patent/ATE14999T1/en
Publication of WO1982003349A1 publication Critical patent/WO1982003349A1/en

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
    • B22D41/14—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.
  • Another type of monoblock pouring stopper has been developedwhich is formed in one-piece by an isostatic pressing of graphitized alumina.
  • this stopper is also shortened by erosion at the tip of the stopper. This necessitates removal of the stopper and reshaping and grinding of the tip in order to provide a good mating seal with the pouring nozzle in a ladle or tun dish.
  • a one-piece monoblock pouring stopper having a nose portion comprising a high refractory material selected from calcined alumina, fused alumina, magnesite and zirconia.
  • the most preferred high refractory additive material is stabilised or unstabilised zirconia.
  • a method of manufacturing a one-piece monoblock pouring stopper comprising charging a mould with a refractory material and a bonding agent to a level short of the full capacity of the mould and filling the remaining volume with a higher refractory material selected from calcined alumina, fused alumina, magnesite and zirconia, together with a bonding agent, compressing the contents of the mould, firing the compressed contents to form a monolithic structure and shaping the monolithic structure to form a one-piece monoblock stopper.
  • 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
  • a graded batch of zirconia together with a phenolic resin bonding agent, optionally including other minor ingredients such as graphite, is blended in a high intensity mixer to form a homogeneous blend and the blend is added to the mould to fill the remaining volume.
  • 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 monolithic structure which can then be shaped 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 which allows the optional step of inj ection 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)

Abstract

A method of manufacturing a one-piece monoblock pouring stopper (1) comprises charging a mould with a refractory material (1) and a bonding agent to a level short of the full capacity of the mould and filling the remaining volume with a higher refractory material (2) selected from calcined alumina, fused alumina, magnesite and zirconia, together with a bonding agent such as foundry resin, compressing the contents of the mould, preferably by isostatic pressing, firing the compressed contents to form a monolithic structure and shaping monolithic structure to form a one-piece monoblock stopper.

Description

IMPROVED MONOBLOCK ONE-PIECE POURING STOPPER
DESCRIPTION
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.
These 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. In use 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. Another type of monoblock pouring stopper has been developedwhich is formed in one-piece by an isostatic pressing of graphitized alumina.
However the effective life of this stopper is also shortened by erosion at the tip of the stopper. This necessitates removal of the stopper and reshaping and grinding of the tip in order to provide a good mating seal with the pouring nozzle in a ladle or tun dish.
In the modern continuous casting plants this interruption in production not only wastes time but also fuel due to the cooling to allow removal of the stopper and subsequent reheating required to attain operating temperatures when the stopper is replaced. It is an object of the present invention to obviate or mitigate the aforesaid disadvantages. According to the present invention there is provided a one-piece monoblock pouring stopper having a nose portion comprising a high refractory material selected from calcined alumina, fused alumina, magnesite and zirconia. The most preferred high refractory additive material is stabilised or unstabilised zirconia.
Further according to the present inventipn there is provided a method of manufacturing a one-piece monoblock pouring stopper comprising charging a mould with a refractory material and a bonding agent to a level short of the full capacity of the mould and filling the remaining volume with a higher refractory material selected from calcined alumina, fused alumina, magnesite and zirconia, together with a bonding agent, compressing the contents of the mould, firing the compressed contents to form a monolithic structure and shaping the monolithic structure to form a one-piece monoblock stopper.
Preferably the mould is an isostatic pressing mould and compression of the contents thereof is effected by an isostatic pressing apparatus. Most preferably, 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 preferred embodiment of this invention will now be described by way of example with reference to the accompanying drawing in which a monoblock stopper is illustrated mounted in an operational position above a pouring nozzle of a tun-dish.
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 A graded batch of zirconia together with a phenolic resin bonding agent, optionally including other minor ingredients such as graphite, is blended in a high intensity mixer to form a homogeneous blend and the blend is added to the mould to fill the remaining volume.
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 monolithic structure which can then be shaped to form a one-piece monoblock stopper provided with an integral armoured nose portion of zirconia which is more highly resistant to erosion. Thus such a stopper has an extended working life.
In use 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.
By raising or lowering of the control member 3 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 , which allows the optional step of inj ection 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.

Claims

Claims:
1. A method of manufacturing a one-piece monoblock pouring stopper comprising charging a mould with a refractor material and a bonding agent to a level short of the full capacity of the mould and filling the remaining volume with a higher refractory material selected from calcined alumina, fused alumina, magnesite and zirconia, together with a bonding agent, compressing the contents of the mould, firing the compressed contents to form a monolithic structure and shaping the monolithic structure to form a one-piece monoblock stopper.
2. A method according to claim 1, wherein the mould is an isostatic pressing mould and compression of the contents thereof is effected by an isostatic pressing apparatus.
3. A method according to claim 2, wherein the isostatic pressing mould is charged with graphitized alumina bonded with a foundry type resin to a level short of the full capacity of the mould and the remaining volume is filled with a mix of zirconia and a foundry resin as bonding agent.
4. A monoblock stopper whenever produced by a method according to any one of claims 1 to 3.
5. A one-piece monoblock stopper having an integral armoured nose portion comprising zirconia bound with a foundry resin.
PCT/GB1982/000102 1981-04-01 1982-04-01 Improved monoblock one-piece pouring stopper WO1982003349A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE8282900977T DE3265542D1 (en) 1981-04-01 1982-04-01 Improved monoblock one-piece pouring stopper
DE1982900977 DE74988T1 (en) 1981-04-01 1982-04-01 IMPROVED ONE-PIECE PLUG BAR.
AT82900977T ATE14999T1 (en) 1981-04-01 1982-04-01 IMPROVED ONE-PIECE STOPPER ROD.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8110120 1981-04-01
GB8110120810401 1981-04-01

Publications (1)

Publication Number Publication Date
WO1982003349A1 true WO1982003349A1 (en) 1982-10-14

Family

ID=10520814

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1982/000102 WO1982003349A1 (en) 1981-04-01 1982-04-01 Improved monoblock one-piece pouring stopper

Country Status (4)

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

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0232470A1 (en) * 1985-12-21 1987-08-19 Didier-Werke Ag Gas-flushing brick for a melting vessel
EP0526718A1 (en) * 1991-08-05 1993-02-10 Didier-Werke Ag Method for induction heating of ceramic parts
EP0625391A1 (en) * 1993-05-15 1994-11-23 Thor Ceramics Limited Fluted stopper
GB2340424A (en) * 1998-08-14 2000-02-23 Didier Werke Ag Stopper rod with detachable nose portion

Families Citing this family (2)

* 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
JPH01166877A (en) * 1987-12-23 1989-06-30 Shinagawa Refract Co Ltd Opener and opening method of insert nozzle for slide valve device

Citations (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
FR2292542A1 (en) * 1974-11-30 1976-06-25 Nippon Crucible Co PROCESS FOR MANUFACTURING A CASTING TUBE AND A STAINLESS STEEL FOR THE CONTINUOUS CASTING OF STEEL
FR2367555A1 (en) * 1976-10-13 1978-05-12 Mannesmann Ag PLUNGE NOZZLE FOR CONTINUOUS CASTING OF STEEL
FR2464769A1 (en) * 1979-09-10 1981-03-20 Akechi Taikarenga Kk Casting pipe for continuous casting of steel - with refractory coating resisting erosion by molten casting powder, so pipe has long working life

Patent Citations (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
FR2292542A1 (en) * 1974-11-30 1976-06-25 Nippon Crucible Co PROCESS FOR MANUFACTURING A CASTING TUBE AND A STAINLESS STEEL FOR THE CONTINUOUS CASTING OF STEEL
FR2367555A1 (en) * 1976-10-13 1978-05-12 Mannesmann Ag PLUNGE NOZZLE FOR CONTINUOUS CASTING OF STEEL
FR2464769A1 (en) * 1979-09-10 1981-03-20 Akechi Taikarenga Kk Casting pipe for continuous casting of steel - with refractory coating resisting erosion by molten casting powder, so pipe has long working life

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0232470A1 (en) * 1985-12-21 1987-08-19 Didier-Werke Ag Gas-flushing brick for a melting vessel
EP0526718A1 (en) * 1991-08-05 1993-02-10 Didier-Werke Ag Method for induction heating of ceramic parts
EP0625391A1 (en) * 1993-05-15 1994-11-23 Thor Ceramics Limited Fluted stopper
GB2340424A (en) * 1998-08-14 2000-02-23 Didier Werke Ag Stopper rod with detachable nose portion
GB2340424B (en) * 1998-08-14 2003-04-02 Didier Werke Ag Stopper

Also Published As

Publication number Publication date
EP0074988A1 (en) 1983-03-30
EP0074988B1 (en) 1985-08-21
AU8276082A (en) 1982-10-19
DE3265542D1 (en) 1985-09-26

Similar Documents

Publication Publication Date Title
US5083687A (en) Nozzle for continuous casting and method of producing
GB2095612A (en) Improve monoblock one-piece pouring stopper
EP0074988B1 (en) Improved monoblock one-piece pouring stopper
GB1575124A (en) Tundishes and lining slabs therefor
WO1995028363A1 (en) Alumina-zirconia refractory material and articles made therefrom
US5151201A (en) Prevention of erosion and alumina build-up in casting elements
CN103008638A (en) Composite integral stopper and manufacture method thereof
US6103651A (en) High density ceramic metal composite exhibiting improved mechanical properties
US4549677A (en) Casting of aluminium-killed steels
CA2200666C (en) Well brick of vessel for molten metal
CN1032746C (en) Aluminium carbon integrated filler rod
JPS6015587B2 (en) Refractories for molten metal
JP3015305B2 (en) Nozzle for continuous casting of steel
US4391392A (en) Sliding closure unit
US4813580A (en) Method of pouring steel
JP3692387B2 (en) Manufacturing method of sliding gate plate
JPS605547B2 (en) Immersion nozzle for continuous casting
JP3685568B2 (en) Indefinite refractory for secondary smelting ladle lining
AU695890B2 (en) Immersed metallurgical pouring nozzles
KR102100014B1 (en) Refractory for ladle of molten steel
JP2540214B2 (en) Refractory material
JPH1143716A (en) Tuyere brick in vessel for molten metal
Marino Use of Calcium Oxide as Refractory Material in Steel Making Processes
SU937098A1 (en) Heat resistant paste for repairing metallic moulds
JPH0747465A (en) Zirconia quality sliding nozzle plate

Legal Events

Date Code Title Description
AK Designated states

Designated state(s): AU BR FI JP NO US

AL Designated countries for regional patents

Designated state(s): AT BE CH DE FR GB LU NL SE

WWE Wipo information: entry into national phase

Ref document number: 1982900977

Country of ref document: EP

WWP Wipo information: published in national office

Ref document number: 1982900977

Country of ref document: EP

WWG Wipo information: grant in national office

Ref document number: 1982900977

Country of ref document: EP