EP0686444B1 - Stromabwärts liegendes Teil einer Stranggiesskokille mit dünnen Seitenwänden - Google Patents

Stromabwärts liegendes Teil einer Stranggiesskokille mit dünnen Seitenwänden Download PDF

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Publication number
EP0686444B1
EP0686444B1 EP95107943A EP95107943A EP0686444B1 EP 0686444 B1 EP0686444 B1 EP 0686444B1 EP 95107943 A EP95107943 A EP 95107943A EP 95107943 A EP95107943 A EP 95107943A EP 0686444 B1 EP0686444 B1 EP 0686444B1
Authority
EP
European Patent Office
Prior art keywords
cooling fluid
assembly
mould portion
cooling
inner sidewall
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 - Lifetime
Application number
EP95107943A
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English (en)
French (fr)
Other versions
EP0686444A1 (de
Inventor
Giampietro Benedetti
Gianni Gensini
Milorad Pavlicevic
Alfredo Poloni
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.)
Danieli and C Officine Meccaniche SpA
Original Assignee
Danieli and C Officine Meccaniche SpA
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Publication of EP0686444A1 publication Critical patent/EP0686444A1/de
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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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
    • B22D11/1243—Accessories for subsequent treating or working cast stock in situ for cooling by using cooling grids or cooling plates
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/055—Cooling the moulds
    • 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing

Definitions

  • This invention concerns an assembly for continuous casting with a downstream mould portion with thin sidewalls for continuous casting, as set forth in the main claim.
  • the downstream mould portion according to the invention is employed in the continuous casting of thin and medium slabs, billets, blooms, etc. having a round, square, polygonal or any other analogous cross-section in general.
  • the state of the art includes the provision of a downstream mould portion at the outlet of, and in prolongation of, the oscillatory crystallizer which defines the specific form of the cast slab, this downstream mould portion including an intensive cooling system.
  • cooling fluid is delivered directly into contact with the solidified skin of the slab.
  • the state of the art includes various types of downstream mould portions employed for the formation of slabs having a square or rectangular cross-section or of slabs having a round cross-section.
  • the former slabs are generally shaped with four or more elements or plates arranged as the sides of a square and separated at the angles where they converge.
  • the latter slabs are shaped with shell elements arranged according to a circumference, as can be seen in EP-A-0268143 for instance.
  • US-A-2,698,467 discloses a downstream mould portion with helicoidal grooves on its periphery; this document, however, does not teach how to adjust the dimensions of the downstream mould portion to the actual dimensions of the slab passing through nor how to ensure the desired pressure against the slab.
  • EP-A-0367024 in the name of the present applicants teaches the provision of a downstream mould portion consisting of a plurality of independent, movable and self-aligning elements, whereby the sides of each element together with those of the neighbouring element define clefts having a development not parallel to the axis and surface of the solidifying slab.
  • Patent CH-B-357.835 discloses downstream mould portion devices with a cooling chamber with a circulation of cooling fluid, the sidewall in contact with the product leaving the mould being characterised by a surface extending within the cooling chamber; this extending surface stiffens the sidewall itself of the downstream mould portion.
  • Patent US-A-3 688 833 describes a secondary cooling system for continuous casting plants wherein a plurality of bars have on their surface attached thereto a series of planks. Each plank is provided with a cooling channel wherein cooling liquid can circulate. In this system the inner wall which defines the working surface of each plank has a minimum thickness of 12 mm and is not resilient at all.
  • Patent FR-A-1 465 163 discloses a device for cooling hot metal, in particular continuous casting metal, wherein a metal plate 20 is provided to contact and guide the slab. An intermediate wall 21 and the plate 20 form a cooling channel on which water is forced at high speed.
  • the plate 20 is provided with external recesses (fig. 2), but it is not provided with internal means suitable to break up the outermost layer of the stream of the cooling water and to make the movement of the cooling water disturbed and swirling.
  • the purpose of the invention is to embody a downstream mould portion applied to a continuous casting mould, in which it is possible to carry out a high-efficiency accelerated and intensive cooling.
  • the downstream mould portion consists of several elements the intersection of the surfaces of which defines a closed cross-section substantially analogous to the cross-section of the slab, billet or bloom passing through.
  • Each of the elements forming the downstream mould portion has a box-shaped structure defined by an outer sidewall and an inner sidewall.
  • These inner and outer sidewalls define between them a second chamber for circulation of a cooling fluid under pressure.
  • the inner sidewall of the downstream mould portion namely the sidewall facing towards the slab passing through, has a conformation such as to make its behaviour resilient and, according to the invention, a very modest thickness of 4 to 10 mm. but advantageously about 5 to 6 mm.
  • the natural tendency to the outward deformation of the inner sidewall owing to the very high temperatures involved and the modest thickness is counterbalanced by the inward pressure of the cooling fluid circulating within the second fluid circulation chamber.
  • This pressure of the cooling fluid therefore depends on the thrusts and outward deformations of the inner sidewall due to the overheating.
  • the pressure of the cooling fluid against the inner sidewall causes a resilient inward thrust, counterbalances the tensions due to deformation by overheating and keeps the inner sidewall, in fact, adhering to the solidifying skin of the slab.
  • each element forming the downstream mould portion consists in turn of a plurality of substantially vertical panels associated with one another.
  • the corners of the slab are not cooled by the cooling fluid circulating in the chamber of the downstream mould portion, the purpose being to minimise the lengthwise cracks in the surface of the slab.
  • the corners of the slab may be partly cooled, for instance by the delivery of jets of water.
  • At least the side of the outer sidewall facing the second chamber holding the circulating cooling fluid under pressure is shaped and conformed in a manner so as to break up the fluid streams of the outermost layer of the cooling fluid, thus forcing and making swirling the motion of the cooling fluid and improving the heat exchange.
  • a plurality of hollows or other agitation elements are provided in the side of the inner sidewall of the downstream mould portion facing towards the second chamber holding the circulating cooling fluid and break up the outermost surface layer of the fluid, thus causing a further accentuation of the heat exchange.
  • a plurality of enlargements and narrowings is provided on the side of the outer sidewall of the downstream mould portion facing towards the second chamber for the circulation of a cooling fluid and imparts to the fluid a turbulent and swirling motion.
  • the elements forming the downstream mould portion according to the invention are advantageously associated with resilient pressure means ,which are known in themselves and are suitable to maintain continuously the contact with the slab passing through.
  • a downstream mould portion 10 according to the invention is applied to a mould 11 comprising an oscillatory crystallizer 12, within which is located a discharge nozzle 13, the outlet of which is generally positioned below the meniscus of molten metal.
  • the crystallizer 12 cooperates with a closed-circuit primary cooling system that comprises a first chamber 23 for circulation of the cooling fluid, this first chamber 23 being adjacent to the crystallizer sidewall facing the molten metal.
  • a first thickness 14 of solidified skin is formed in the slab 22 within the crystallizer 12, whereas the core 15 of the cast slab remains substantially liquid.
  • the downstream mould portion 10 according to the invention is positioned at the outlet of, and in prolongation of, the crystallizer 12.
  • the downstream mould portion 10 consists of four elements 10a arranged about the periphery of the slab 22 and defining a passage having a cross-section of dimensions mating with the cross-section of the slab 22 itself.
  • the cast product has a square cross-section
  • the cross-section of the product is rectangular
  • Each element 10a possesses a box-shaped structure comprising a first outer sidewall 16 and a second inner sidewall 17, these sidewalls 16-17 defining between them one or more second chambers 18 for the circulation of a cooling fluid under pressure.
  • the outer sidewall 16 is associated with at least one conduit 20 to feed a cooling fluid under pressure and at least one conduit 19 to discharge cooling fluid under pressure, the conduits 19-20 being associated with means 28 that adjust and close the flow of fluid.
  • the inner sidewall 17 faces the slab 22 passing through and has a very modest thickness of 4 to 10 mm, but advantageously 5 to 6 mm.
  • the natural tendency of the inner sidewall 17 to become deformed outwards owing to the very great heat exchange with the slab 22 passing through, this tendency being accentuated by the modest thickness of the inner sidewall 17 itself, is compensated by acting on the pressure of the cooling fluid circulating within the second chamber 18.
  • This pressure acts against the inner sidewall 17 and causes a resilient thrust towards the slab 22, thus counterbalancing the thrusts due to deformation and, in fact, maintaining the inner sidewall 17 in a condition of adherence to the solidified skin 14 of the slab 22.
  • the side of the outer sidewall 16 facing the second chamber 18 for circulation of the cooling fluid is shaped and conformed to break up the fluid stream and thus to make swirling the movement of the cooling fluid and to increase the coefficient of the heat exchange between the cooling fluid and the inner sidewall 17 of the downstream mould portion 10.
  • the conformation provides alternate narrowed areas 26 and enlarged areas 27 for the purpose of causing in the circulating fluid a desired turbulence.
  • enlarged areas 27 and narrowed areas 26 may have a polygonal development (Fig.5) or a development producing a Venturi effect (Fig.2), which makes the motion of the fluid swirling and accentuates the heat exchange.
  • the side of the inner sidewall 17 facing the second chamber 18 for the circulation of fluid includes a plurality of agitation elements shaped in this case as cavities 21, into which the cooling fluid enters, thus breaking up the outermost layer of the fluid and causing a further accentuation of the heat exchange.
  • the cavities 21 may have a horizontal development 21a or an inclined development 21b (Fig.7).
  • Each element 10a of the downstream mould portion 10 includes springs 24, which are associated with a stationary supporting structure 25 and are suitable to maintain contact between the inner sidewall 17 and the slab 22 passing through and to exert a desired pressure against the slab 22.
  • each element 10a forming the downstream mould portion 10 is embodied with a plurality of vertical adjacent panels 110, each of which includes its own inner 17 and outer 16 sidewalls and a second chamber 18 for circulation of the cooling-fluid.
  • These vertical panels 110 can cooperate independently with the position-adjustment springs 24 for the purpose of providing an independent adaptation of one to the other.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Claims (10)

  1. Anordnung zum Stranggießen von Produkten wie Brammen, Knüppel oder Blöcken (22), mit einer Kokille (11) und einem stromabwärts liegenden Kokillenteil (10), der unter der Kokille (11) angeordnet ist, wobei die Kokille (11) mindestens einen Kristallisierer (12) aufweist, der mit einer das zu gießende Metall ausstoßenden Auslaßdüse (13) zusammenwirkt, und der mit einem geschlossenen ersten Kühlkreislauf einer ersten unter Druck stehenden Kühlflüssigkeit versehen ist, dieses Kühlsystem weist eine erste Kühlkammer (23) auf, in der die erste Kühlflüssigkeit zirkuliert, wobei ferner der stromabwärts liegende Kokillenteil (10) eine Mehrzahl von unabhängigen Elementen (10a) besitzt, die einen Querschnitt begrenzen, der dem Querschnitt des durchlaufenden gegossenen Produktes (22) entspricht, wobei ferner jedes Element (10a) des stromabwärts gelegenen Kokillenteiles (10) mindestens eine äußere Seitenwand (16) und eine innere Seitenwand (17) aufweist, welche eine zweite geschlossene Kammer für die Zirkulation einer zweiten unter Druck stehenden Kühlflüssigkeit begrenzen, und die innere Seitenwand (17) das gegossene Produkt (22) berühren, sowie die äußere Seitenwand (16) mit Mitteln (20) zum Zuführen und Mitteln (19) zum Abführen der zweiten Kühlflüssigkeit aufweisen, dadurch gekennzeichnet daß die innere Seitenwand (17) des stromabwärts gelegenen Kokillenteiles (10) federnd ist und eine Stärke zwischen 4 bis 10mm aufweist, und daß Mittel (28) vorgesehen sind, die den Druck auf die zweite Kühlflüssigkeit in der zweiten Kühlkammer (18) in Abhängigkeit von den Drücken und elastischen Deformationen der inneren Seitenwand (17) zufolge des Überhitzens einstellen.
  2. Anordnung nach Anspruch 1, bei der die innere Seitenwand (17) eine Stärke von etwa 5 bis 6mm aufweist.
  3. Anordnung nach Anspruch 1 oder 2, in der jene Seite der inneren Seitenwand (17), die die zweite Kammer (18) für die Zirkulation der zweiten Kühlflüssigkeit begrenzt, Mittel (21) aufweist, die zum Aufbrechen der äußersten Schicht des Stromes der zweiten Kühlflüssigkeit geeignet sind, um die Bewegung der zweiten Kühlflüssigkeit durchzuwirbeln.
  4. Anordnung nach Anspruch 3, bei der die Mittel zum Aufbrechen der äußersten Schicht des Kühlflüssigkeitsstromes aus horizontalen (21a ) oder geneigten (21b) Höhlungen (21) bestehen, die in der Oberfläche der inneren Seitenwand (17) vorgesehen sind, die die zweite Kammer (18) für die Zirkulation der zweiten Kühlflüssigkeit begrenzen.
  5. Anordnung nach einem der vorstehenden Ansprüche, in der jene Seite der äußeren Seitenwand (16), die gegen die zweite Kammer (18) für die Zirkulation der zweiten Kühlflüssigkeit gerichtet ist, abwechselnd erweiterte Bereiche (26) und schmälere Bereiche (27) aufweist, welche die Bewegung der zweiten Kühlflüssigkeit herbeiführen.
  6. Anordnung nach einem der vorstehenden Ansprüche, bei der die aufeinanderfolgenden erweiterten Bereiche (26) und schmäleren Bereiche (27) eine polygonale Gestalt aufweisen.
  7. Anordnung nach Anspruch 5, bei der die aufeinanderfolgenden erweiterten Bereiche (26) und schmäleren Bereiche (27) eine Gestalt aufweisen, die zur Erzielung eines Venturieffektes in der zweiten Flüssigkeit geeignet sind.
  8. Anordnung nach einem der vorstehenden Ansprüche, bei der Mittel zumindestens zum teilweisen Aufspritzen von Wasser auf die Ecken des gegossenen Produktes (22) vorgesehen sind.
  9. Anordnung nach einem der vorstehenden Ansprüche, bei der jedes den stromabwärts gelegenen Kokillenteil (10) bildenden Elementes (10a) durch eine Mehrzahl von Paneelen (110) verkörpert wird, die Seite an Seite und im wesentlichen parallel zur Bewegungsachse des gegossenen Produktes (22) angeordnet sind.
  10. Anordnung nach einem der vorstehenden Ansprüche, bei der jedes der den stromabwärts gelegenen Kokillenteil (10) bildenden Elemente (10a) mit Positioniermittel zusammenwirkt, die einen elastischen Druck gegen das gegossene Produkt (22) ausüben.
EP95107943A 1994-06-06 1995-05-24 Stromabwärts liegendes Teil einer Stranggiesskokille mit dünnen Seitenwänden Expired - Lifetime EP0686444B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUD940093 1994-06-06
IT94UD000093A IT1267246B1 (it) 1994-06-06 1994-06-06 Sottolingottiera a pareti per colata continua

Publications (2)

Publication Number Publication Date
EP0686444A1 EP0686444A1 (de) 1995-12-13
EP0686444B1 true EP0686444B1 (de) 2000-03-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP95107943A Expired - Lifetime EP0686444B1 (de) 1994-06-06 1995-05-24 Stromabwärts liegendes Teil einer Stranggiesskokille mit dünnen Seitenwänden

Country Status (6)

Country Link
EP (1) EP0686444B1 (de)
CN (1) CN1048668C (de)
AT (1) ATE190879T1 (de)
DE (1) DE69515726T2 (de)
ES (1) ES2142971T3 (de)
IT (1) IT1267246B1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007002405A1 (de) 2007-01-17 2008-07-24 Sms Demag Ag Stranggießkokille mit Kühlmittelkanal
DE102017206914A1 (de) 2017-04-25 2018-10-25 Sms Group Gmbh Stranggießkokille mit strömungsoptimierter Kühlung
CN113015587B (zh) * 2018-11-09 2022-12-27 杰富意钢铁株式会社 钢的连续铸造用铸模和钢的连续铸造方法
CN111482565B (zh) * 2020-04-21 2021-06-01 北京科技大学 一种紧凑型多段小型铸棒连铸结晶器系统
CN114042879A (zh) * 2021-11-25 2022-02-15 北京科技大学 一种强化冷却水平连铸结晶器

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2698467A (en) 1950-06-05 1955-01-04 Edward W Osann Jr Method and apparatus for the continuous casting of metal
CH357835A (de) 1958-02-01 1961-10-31 Schloemann Ag Stranggusseinrichtung
FR1465163A (fr) * 1966-01-21 1967-01-06 Concast Ag Procédé et dispositif pour refroidir du métal chaud, en particulier du métal coulé en continu
US3688833A (en) * 1970-11-03 1972-09-05 Vladimir Alexandrovich Bykov Secondary cooling system for continuous casting plants
JPS59141347A (ja) * 1983-02-01 1984-08-14 Kuroki Kogyosho:Kk 連続鋳造用鋳型
JPS59141348A (ja) * 1983-02-01 1984-08-14 Kuroki Kogyosho:Kk 連続鋳造用鋳型
CH671533A5 (de) 1986-11-19 1989-09-15 Concast Standard Ag
IT1226913B (it) 1988-10-31 1991-02-22 Stefano Arici Attrezzatura per la colata continua dell'acciaio.

Also Published As

Publication number Publication date
EP0686444A1 (de) 1995-12-13
ITUD940093A1 (it) 1995-12-06
ATE190879T1 (de) 2000-04-15
DE69515726T2 (de) 2000-11-23
IT1267246B1 (it) 1997-01-28
DE69515726D1 (de) 2000-04-27
ITUD940093A0 (it) 1994-06-06
ES2142971T3 (es) 2000-05-01
CN1116140A (zh) 1996-02-07
CN1048668C (zh) 2000-01-26

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