US3877508A - Apparatus with self-centering stool for continuous casting of metals - Google Patents

Apparatus with self-centering stool for continuous casting of metals Download PDF

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Publication number
US3877508A
US3877508A US326078A US32607873A US3877508A US 3877508 A US3877508 A US 3877508A US 326078 A US326078 A US 326078A US 32607873 A US32607873 A US 32607873A US 3877508 A US3877508 A US 3877508A
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US
United States
Prior art keywords
stool
fluid
continuous casting
casting apparatus
mould
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Expired - Lifetime
Application number
US326078A
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English (en)
Inventor
Neil Burton Bryson
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Alcon Research LLC
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Alcon Research LLC
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Filing date
Publication date
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Publication of US3877508A publication Critical patent/US3877508A/en
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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
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/08—Accessories for starting the casting procedure

Definitions

  • the present invention relates to the continuous casting of ingots by the direct chill method.
  • the bottom of the mould is closed by a stool or plug at the beginning of each casting operation to allow the mould to be filled with molten metal to a desired level.
  • the table, on which the stool is supported is lowered at a predetermined rate and coolant is applied to the surface of the growing ingot around the bottom margin of the mould, the metal level within the mould being maintained by pouring additional molten metal.
  • the moulds are small in cross section, it is usual to pour a substantial number of ingots at the same time.
  • the present invention is based on the appreciation that a stool freely mounted on the table could be operated satisfactorily in self-aligning manner if the friction between the stool and the table could be reduced and, in particular, be reduced during the period when the stool is being entered into the mould. During the rest of the casting operation it is, in fact, preferred that the stool should remain solidly supported by the table.
  • the table of a continuous casting apparatus of the present type is provided with at least one stool having a limited degree of freedom of sliding movement laterally in relation to the table, the table being provided with means for delivering a fluid under pressure to the underside of the stool to provide a cushion of fluid between the table and the stool to permit the stool to be moved relative to the table by a very small lateral force.
  • the upper end of the stool is preferably slightly rounded to allow the stool to enter the mould as the table is raised.
  • pressurised fluid is being supplied, the desired lateral movement of the stool is very readily effected automatically as the stool enters the mould.
  • a continuous casting apparatus comprising a vertically movable table having a horizontal support surface adapted to support at least one ingot-receiving stool at a predetermined location on the upper surface thereof, said table having a flat surface at such location to permit lateral sliding movement of said stool, a stool located on said table at such location and having a sub stantially continuous peripheral surface for support by said table, said stool being arranged to have at least limited free movement in relation to said table both horizontally and vertically, means for supplying a fluid under pressure through said table to the underside of the stool at a location lying within said substantially continuous peripheral surface to establish a laterally escaping fluid layer between said table and said stool to lift said stool out of contact with the table, allowing lateral sliding movement of said stool without tilting in relation to said table.
  • the table is preferably formed so that its whole upper surface is flat. It is however only essential that there shall be at each stool position a flat area of sufficient extent to permit the essential lateral freedom of movement.
  • the stool or stools may be solid or may be internally hollow. lt is necessary for the bottom of the stool to have an essentially flat surface surrounding the fluid supply port means in the upper surface of the table so that an essentially uniform stream of fluid may escape laterally from beneath the stool when the fluid supply is switched on, thus maintaining the stool or stools out of direct contact with the table during the upward movement of the table to bring the stool or stools into closing relation with the mould or moulds.
  • the self-centering floating stool of the present invention may enter the mould to form a seal with the peripheral wall instead of sealing against the bottom end of the mould.
  • the table of a continuous casting apparatus is provided with a plurality of stools at positions corresponding to the locations of a plurality of moulds, into which metal is poured simultaneously by pouring metal from a holding furnace into a common trough system, from which metal is fed through dip tubes to the individual moulds in a manner which is well-known in the art.
  • the table itselfis preferably a laminated construction, in which passageways are formed leading from a fluid inlet to the stool portion.
  • FIG. I is a part section through a table equipped with the floating stool of the present invention.
  • FIG. 2 is a diagrammatic plan view of the table.
  • the stool l is provided with a retainer member 2, trapped within a fluid support port 3 in the table 4, so that the stool 1 has a limited freedom of movement both vertically and laterally in relation to the table 4 and can float in relation to the table on a cushion or film of air or water supplied under pressure through the port 3.
  • the stool 1 has a rounded corner 5 to assist entry of the stool into the mould 6.
  • supplementary centering action may be provided by pegs 7 which contact a conical surface 8 at the bottom of the mould, as indicated in FIG. 1.
  • pegs 7 which contact a conical surface 8 at the bottom of the mould, as indicated in FIG. 1.
  • four pegs 7 have been shown for convenience of illustration, three pegs are preferably provided at equiangular spacing around the periphery of the stool. With this arrangement, no contact at all will occur between the stool and the mould. thus eliminating all possibility of damage to the mould by the stool.
  • the conical surface 8 and pegs 7 are an optional feature, but when employed it permits the radius of the rounded corner to be reduced to a low value.
  • Air may be fed through a flexible hose l0 and through an on-off valve 11 to a manifold 12. from which galleries 14 lead to the ports 3.
  • a continuous casting apparatus comprising a vertically movable table having a horizontal upper support surface. adapted to support at least one ingot-receiving stool at a predetermined location on said upper surface. said table upper surface being flat at such location to permit lateral sliding movement of said stool and having an opening at such location for upward flow of fluid therethrough. a stool disposed on said table upper surface at such location and having a flat bottom sur face for support by said table, said flat bottom surface extending at least continuously around the periphery of said opening.
  • said stool being arranged to have at least limited free movement in relation to said table both horizontally and vertically, and means for supplying a fluid under pressure through said table and said open ing to the underside of the stool at a location lying within said substantially continuous periphery of said flat bottom surface to establish a laterally escaping fluid layer between said table and said stool to lift said stool out of contact with the table, allowing lateral sliding movement of said stool without tilting in relation to said table.
  • a continuous casting apparatus in which the stool is shaped to enter the mould and seal with the side wall thereof, the stool being provided with laterally projecting formations to engage with a tapering ring arranged below and concentric with the mould.
  • a continuous casting apparatus wherein said projecting formations comprise three pegs equiangularly spaced around the periphery of the stool.
  • a continuous casting apparatus including an enlarged portion provided within, and below the upper surface of said table; and further including a retainer member confined within said enlarged portion of said opening for restricted vertical and lateral movement. and a shaft disposed in coaxial relation to said stool and projecting downwardly through said opening for fixedly securing said retainer member to said stool.
  • a continuous casting apparatus according to claim 1, wherein said stool has a rounded upper peripheral edge for facilitating properly positioned entry of the stool into the lower end of a mould.
  • a continuous casting apparatus according to claim 1, wherein said stool has a roughened flat bottom surface for providing frictional resistance to lateral movement of said stool relative to said table when said stool bottom surface is resting on said table upper surface.
  • a continuous casting apparatus according to claim 1, wherein said table has a plurality of openings for upward flow of fluid disposed at spaced locations in the upper surface of said table, and further including a plurality of stools each identical to the first-mentioned stool and respectively disposed at said spaced locations to be lifted by fluid escaping through said openings; wherein a common fluid passage is provided in said table. communicating with all of said openings", and wherein said fluid-supplying means comprises means for supplying fluid to said common passage.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Producing Shaped Articles From Materials (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
US326078A 1972-01-24 1973-01-23 Apparatus with self-centering stool for continuous casting of metals Expired - Lifetime US3877508A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB332172A GB1414302A (en) 1972-01-24 1972-01-24 Apparatus for continuous casting of metals

Publications (1)

Publication Number Publication Date
US3877508A true US3877508A (en) 1975-04-15

Family

ID=9756120

Family Applications (1)

Application Number Title Priority Date Filing Date
US326078A Expired - Lifetime US3877508A (en) 1972-01-24 1973-01-23 Apparatus with self-centering stool for continuous casting of metals

Country Status (5)

Country Link
US (1) US3877508A (enrdf_load_stackoverflow)
JP (1) JPS5226215B2 (enrdf_load_stackoverflow)
CA (1) CA970522A (enrdf_load_stackoverflow)
GB (1) GB1414302A (enrdf_load_stackoverflow)
NO (1) NO135697C (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5217060A (en) * 1990-12-20 1993-06-08 Alures S.C.P.A. Continuous casting apparatus having a mobile bottom closure/support
WO1995010376A1 (en) * 1993-10-13 1995-04-20 Norsk Hydro A.S Semi-continuous casting equipment for the manufacture of roll ingots

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5933467B2 (ja) * 1974-04-26 1984-08-16 カイザ− アルミナム アンド ケミカル コ−ポレ−ション 堅型直接チル鋳造装置
JPS5923898B2 (ja) * 1977-07-07 1984-06-05 三協アルミニウム工業株式会社 高ケイ素アルミニウム合金の連続鋳造法
GB2177633A (en) * 1985-07-18 1987-01-28 Aluminum Co Of America A block for starting the process of continuous casting of molten metal

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3384152A (en) * 1966-04-01 1968-05-21 Anaconda Aluminum Co Starting block assembly for continuous casting apparatus
US3702631A (en) * 1971-03-22 1972-11-14 Alcan Res & Dev Apparatus for continuous casting of metal ingots

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3384152A (en) * 1966-04-01 1968-05-21 Anaconda Aluminum Co Starting block assembly for continuous casting apparatus
US3702631A (en) * 1971-03-22 1972-11-14 Alcan Res & Dev Apparatus for continuous casting of metal ingots

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5217060A (en) * 1990-12-20 1993-06-08 Alures S.C.P.A. Continuous casting apparatus having a mobile bottom closure/support
WO1995010376A1 (en) * 1993-10-13 1995-04-20 Norsk Hydro A.S Semi-continuous casting equipment for the manufacture of roll ingots
US5634511A (en) * 1993-10-13 1997-06-03 Norsk Hydro A.S. Semi-continuous casting equipment having a centering device for centering a bottom block relative to a casting mold

Also Published As

Publication number Publication date
DE2303399A1 (de) 1973-08-09
DE2303399B2 (de) 1975-08-14
JPS4883036A (enrdf_load_stackoverflow) 1973-11-06
NO135697C (enrdf_load_stackoverflow) 1977-05-16
JPS5226215B2 (enrdf_load_stackoverflow) 1977-07-13
NO135697B (enrdf_load_stackoverflow) 1977-02-07
GB1414302A (en) 1975-11-19
CA970522A (en) 1975-07-08

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