EP1007247B1 - Verfahren und vorrichtung zum stranggiessen von metallen mit kokillen-aufsatz - Google Patents

Verfahren und vorrichtung zum stranggiessen von metallen mit kokillen-aufsatz Download PDF

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Publication number
EP1007247B1
EP1007247B1 EP98940292A EP98940292A EP1007247B1 EP 1007247 B1 EP1007247 B1 EP 1007247B1 EP 98940292 A EP98940292 A EP 98940292A EP 98940292 A EP98940292 A EP 98940292A EP 1007247 B1 EP1007247 B1 EP 1007247B1
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EP
European Patent Office
Prior art keywords
fluid
casting
slot
ingot mould
aperture
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
EP98940292A
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English (en)
French (fr)
Other versions
EP1007247A1 (de
Inventor
Eric Perrin
Cosimo Salaris
Edouard Weisseldinger
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.)
Forges et Acieries de Dilling SA
Ascometal SA
Sollac SA
Ugitech SA
Original Assignee
Forges et Acieries de Dilling SA
Ascometal SA
Sollac SA
Ugine Savoie Imphy SA
Lorraine de Laminage Continu SA SOLLAC
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.)
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Publication date
Application filed by Forges et Acieries de Dilling SA, Ascometal SA, Sollac SA, Ugine Savoie Imphy SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Forges et Acieries de Dilling SA
Publication of EP1007247A1 publication Critical patent/EP1007247A1/de
Application granted granted Critical
Publication of EP1007247B1 publication Critical patent/EP1007247B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/0401—Moulds provided with a feed head
    • 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
    • B22D11/041—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for vertical casting
    • 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
    • B22D11/16—Controlling or regulating processes or operations

Definitions

  • the present invention relates to continuous casting in charge of metals, especially steel. It relates more specifically to the elements constitutive of the ingot mold of which it is a question of regulating their relative positioning during assembly of the assembly.
  • Continuous casting under load can be seen as an evolution of the classic continuous casting which is manifested by the fact that the meniscus (free surface of the cast metal) is pushed upwards relative to the level where the solidification of the metal begins against the cooled copper of the mold, while these two levels are almost confused in continuous casting classic.
  • This originality is obtained by the installation, on the part in cooled copper of the ingot mold, of a joined extension of refractory material thermal insulation intended to contain the liquid metal poured and on the wall of which any consequent parasitic solidification must be avoided. Therefore, the solidification of the cast metal can start correctly on the edge upper part of this copper part.
  • the bottom of the riser consists of a part in dense refractory with good mechanical resistance, such as Sialon®.
  • This part will fulfill a role of transition zone between the cooled copper of the ingot mold and the fibrous heat-insulating refractory of the riser placed at the on it, which would degrade too quickly if placed directly on the contact of the upper edge of the cooled copper body, where the frank solidification of the cast metal.
  • the risk of parasitic premature solidifications on this intermediate part is increased, but remains without consequences thanks to the blowing of the shear gas at the interface with copper, which interrupts the downward spread of this unwanted process.
  • the shear gas flow is injected through a low slit thickness (barely a few tenths of a mm), which is achieved by compression.
  • a cord of refractory fibrous material placed between the insert of Sialon and the copper body of the ingot mold. Using means of tightening, the cord is compressed until the slit thickness is obtained desired, which is calibrated using regulated shims.
  • the object of the present invention is to allow a distribution homogeneous linear flow of shear gas injected at the interface "refractory riser-cooled metal body of the mold" in bypassing the adjustment of the thickness of the injection slot, and retaining this homogeneous "hot” distribution.
  • the invention relates to a method of regulation of the injection, during casting, of a fluid through a slot injection at the interface "cooled metal body - extension refractory "of a continuous casting ingot mold in charge of metals and opening out around the inside periphery of this mold, the latter being provided with means for locally adjusting the thickness of the slot, process characterized in that, outside of the casting periods, through said slot a flammable fluid, which is ignited upon leaving the slot, and in that one intervenes on said adjustment means so such that the height of the flames emerging from the slit is substantially constant along the entire inside perimeter of the mold.
  • the very idea behind the invention is that we no longer look for a uniform slit thickness over the entire shear gas injection perimeter but uniformity of the distribution of the gas flow according to this perimeter, which is materialized by a curtain of flames, the height of which can be adjusted at any point.
  • the mold consists of two adjoining stages 1 and 14, distinguished from each other in the figures by the horizontal line A-A and at the interface of which is the gas injection slot 20 shearing.
  • the lower stage 1 constitutes the crystallizer. This is the part properly "active" of the mold, because this is where the solidification process of the cast metal by massive extraction of heat.
  • This part made of copper (more generally of copper alloy), energetically cooled by water circulation, has an interior passage 2 for the cast metal 3, in which the latter, in contact with the walls cold metal, will form a solidified crust 4. Once properly initiated, this solidification will continue gradually from the periphery toward the center of the poured product as it advances downward within the mold in the extraction direction indicated by arrow 5.
  • the crystallizer 1 is itself preferably formed of two sets superimposed: a main tubular body 6, extended from above by a auxiliary element 7, well adjusted and aligned internally with the body 6 so to offer the cast product a regular and continuous passage.
  • the main body 6 is conventionally constituted, in the case of the casting of elongated section products such as slabs, by four jointing plates assembled at right angles, or, in the case of casting blooms or billets, by a monolithic tubular element.
  • this body 6 the inner surface of which is intended to come into contact cast metal, is energetically cooled by circulation, against its face external, of a sheet of water channeled in a vertical passage 8 arranged at this effect thanks to a jacket 9 placed a short distance from said face.
  • the shirt 9 has at its ends an upper opening 10 and a lower opening which connect passage 8 respectively with a high discharge chamber 10 and a chamber low introduction not visible in the figures.
  • the auxiliary element 7 is formed in turn by a ring cooled by an internal water circulation in a horizontal channel 12 arranged at proximity of the upper edge 13 on which the solidification of the cast metal.
  • the essential role of ring 7 is precisely to protect thermally this edge 13, which will be very strongly stressed on the plane thermo-mechanical during casting, cooling it more efficiently what can the body's water cooling system do main tubular 6.
  • the upper stage 14 consists of an extension in material uncooled refractory, whose inner wall is also, and for reasons already explained, aligned with that of floor 1.
  • the assembly "cooled metallic crystallizer 1 surmounted by the riser insulating refractory 14 "defines a calibrating passage for the cast metal 3, the upper portion 15 delimited by the extension constitutes a buffer zone of containment of hydrodynamic disturbances caused by the arrival (not shown) of the molten metal in the ingot mold, and the portion 16, which extends it downward, is the solidification zone of the metal sank.
  • a lost inert gas injection circuit (argon by example) is provided between the riser 14 and the crystallizer 7.
  • This circuit includes an annular slot 20 formed at the interface "booster-crystallizer" opening onto the inner periphery of the mold.
  • the slot is connected to a distribution chamber 19 supplied with argon through a calibrated tubing 21, itself connected to a pressurized argon source 22.
  • a tiling 23 envelops it at a distance. 14 thus defining with it a closed box making it possible to limit the risk of oxidation of the liquid metal poured into the mold by air oxygen through refractory mass 17 inevitably somewhat porous.
  • a compressible bead 24 (made of fibrous refractory material by example) serves as a spacer for adjusting the thickness of slot 20.
  • a tightening crown 25 makes it possible to compress this cord using of elastic tightening nuts 28 screwed onto the free end threaded with tie rods 26 caught in anchor pads 27 fixed in the insert 7.
  • the elasticity desired tightening can be obtained as seen by Belleville washers 29 stacked around tie rods 26 under the crown 25 and pertaining to an incoming return 30 of the tapping 23 provided for in its part higher.
  • the box surrounding the extension 14 is partially closed. upper opposite the clamping ring 25 by means of a plug annular 33 fixed under said crown and whose width is adjusted to ability to occupy opening left between return 30 and riser 17
  • An O-ring seal 34 is provided in a groove formed on the inside edge of the return 30 to allow the plug 33 to be able freely slide during adjustments.
  • a vent 35 is advantageously provided through the plug 33 and the crown 25 to allow the purge of the box as explained below.
  • the "two-way" selector 36 has the function of being able to switch to choice on the argon 22 source used during casting, or on a source annex 38 containing a combustible flammable fluid which will inject through slot 20 during inter-flow periods in accordance with the invention.
  • This flammable fluid is for example natural gas.
  • the "cold" situation is taken advantage of to start by adjusting the thickness of the slot 20 to a value of a few tenths of a mm, for example 0.2 mm, by compressing more or minus the spacer cord 24 using the crown 25 as previously stated.
  • the selector 36 being in the position of the Figure 2, flammable fluid from the source 38 is then injected by the slot 20 at a flow rate, initially low, controlled by the regulating valve 37. This gas is ignited with air at the outlet of the slot 20.
  • the latter is then used in the manner of a burner which produces on the inner periphery of the ingot mold a flame curtain 39 whose height can be variable according to the location as a function of the local flow of fuel leaving the slot directly above the location in question.
  • Distribution of fluid flow flammable along this circumference is then adjusted by intervention on the clamping nuts 28 until the flame height 39 is slightly close constant over the entire perimeter when the opening of valve 37 is adjusted to allow a flame height of a few centimeters.
  • a flame height of 2 to 3 cm is sufficient to then ensure a satisfactory flow of argon shear through the slot 20 thus adjusted.
  • the invention has the additional advantage of being able to ensure “cold” sealing of the complete injection circuit. For this, during injecting flammable fluid, a flame can be manually walked all along the circuit. The slightest possible leak is then immediately detected.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Examining Or Testing Airtightness (AREA)

Claims (5)

  1. Verfahren zur Regulierung der Injektion eines Fluids während des Gießens durch einen Injektionsschlitz, der an der Grenzfläche "gekühlter Metallkörper (1) - feuerfester Aufbau (14)" einer metallgefüllten Stranggießkokille angeordnet ist, und der entlang des Innenumfangs der Kokille mündet, welche mit Mitteln zum Einstellen der Weite des Schlitzes versehen ist,
    das Verfahren dadurch gekennzeichnet, dass man außerhalb der Gießperioden durch den Schlitz (20) ein entflammbares Fluid injiziert, welches man bei seinem Austreten aus dem Schlitz entzündet, und dass man die Regulierungsmittel (25, 26, 28, 29) derart einstellt, dass die Höhe der Flammen (39), welche aus dem Schlitz (20) heraustreten, entlang des Innenumfangs der Kokille im Wesentlichen konstant ist.
  2. Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, dass man natürliches Gas als entflammbares Fluid zum Injizieren verwendet.
  3. Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, dass man es auf eine mit Stahl gefüllte Stranggießkokille anwendet.
  4. Vorrichtung zur Ausführung des Verfahrens gemäß Anspruch 1 und bestimmt für eine metallgefüllte Stranggießkokille, welche einen an der Grenzfläche "gekühlter Metallkörper - feuerfester Aufbau" angeordneten Injektionsschlitz für ein Fluid aufweist, welcher entlang des Innenumfangs der Kokille mündet, und wobei die Vorrichtung dadurch gekennzeichnet ist, dass sie aufweist:
    eine Zufuhrleitung zum Zuführen eines Fluids durch den Injektionsschlitz (20), die mit einem Ausströmungsregulierventil (37) und einem Eingangswähler (36) versehen ist, der an den Ausgang unterschiedlicher Fluidversorgungsquellen (22, 38) angeschlossen werden kann;
    und elastische Klemmmittel (25, 26, 28, 29), die erlauben, die Weite des Injektionsschlitzes (20) entlang des Innenumfangs der Kokille einzustellen.
  5. Vorrichtung gemäß Anspruch 4, dadurch gekennzeichnet, dass sie Mittel (35) zur Sicherstellung des Spülens der Fluidinjektionsleitungen der Kokille vorsieht.
EP98940292A 1997-07-23 1998-07-21 Verfahren und vorrichtung zum stranggiessen von metallen mit kokillen-aufsatz Expired - Lifetime EP1007247B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9709351 1997-07-23
FR9709351A FR2766394B1 (fr) 1997-07-23 1997-07-23 Reglage de la tete d'une lingotiere de coulee continue en charge des metaux
PCT/FR1998/001599 WO1999004918A1 (fr) 1997-07-23 1998-07-21 Procede et dispositif pour la coulee continue en charge des metaux

Publications (2)

Publication Number Publication Date
EP1007247A1 EP1007247A1 (de) 2000-06-14
EP1007247B1 true EP1007247B1 (de) 2002-03-13

Family

ID=9509532

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98940292A Expired - Lifetime EP1007247B1 (de) 1997-07-23 1998-07-21 Verfahren und vorrichtung zum stranggiessen von metallen mit kokillen-aufsatz

Country Status (12)

Country Link
US (1) US6311762B1 (de)
EP (1) EP1007247B1 (de)
JP (1) JP4201482B2 (de)
KR (1) KR100546730B1 (de)
AT (1) ATE214313T1 (de)
BR (1) BR9813005A (de)
CA (1) CA2297274C (de)
DE (1) DE69804225T2 (de)
ES (1) ES2174470T3 (de)
FR (1) FR2766394B1 (de)
PT (1) PT1007247E (de)
WO (1) WO1999004918A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1012626A3 (fr) * 1999-04-23 2001-01-09 Ct De Rech S Metallurg Asbl Ve Dispositif pour fabriquer des produits plats par la coulee continue en charge verticale d'un metal en fusion.
FR2800654B1 (fr) * 1999-11-05 2001-12-14 Lorraine Laminage Lingotiere a section large pour la coulee continue verticale en charge des metaux

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1902116A1 (de) * 1968-01-18 1969-08-28 United States Steel Corp Verfahren und Vorrichtung zum Stranggiessen
CA1082875A (en) * 1976-07-29 1980-08-05 Ryota Mitamura Process and apparatus for direct chill casting of metals
US5325910A (en) * 1985-09-20 1994-07-05 Vereinigte Aluminium-Werke Aktiengesellschaft Method and apparatus for continuous casting
DE3533517A1 (de) * 1985-09-20 1987-04-02 Vaw Ver Aluminium Werke Ag Verfahren und vorrichtung zum stranggiessen
EP0470608B1 (de) * 1990-08-09 1999-11-24 Nippon Steel Corporation Verfahren und Einrichtung zum Stranggiessen
FR2703609B3 (fr) 1993-03-30 1995-02-10 Lorraine Laminage Procédé de coulée continue en charge des métaux et lingotière pour sa mise en Óoeuvre.
US5676195A (en) * 1995-07-27 1997-10-14 Usx Corporation Method of and apparatus for limiting ingress of gas to incipient continuous cast slabs

Also Published As

Publication number Publication date
DE69804225T2 (de) 2002-09-19
JP2001510734A (ja) 2001-08-07
CA2297274A1 (fr) 1999-02-04
PT1007247E (pt) 2002-08-30
WO1999004918A1 (fr) 1999-02-04
KR100546730B1 (ko) 2006-01-26
US6311762B1 (en) 2001-11-06
JP4201482B2 (ja) 2008-12-24
EP1007247A1 (de) 2000-06-14
BR9813005A (pt) 2000-08-15
KR20010022221A (ko) 2001-03-15
ES2174470T3 (es) 2002-11-01
FR2766394B1 (fr) 1999-09-03
CA2297274C (fr) 2008-09-23
DE69804225D1 (de) 2002-04-18
ATE214313T1 (de) 2002-03-15
FR2766394A1 (fr) 1999-01-29

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