EP1056559B1 - Vieleckige stranggiesskokille für metallurgische produkte - Google Patents

Vieleckige stranggiesskokille für metallurgische produkte Download PDF

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Publication number
EP1056559B1
EP1056559B1 EP99959484A EP99959484A EP1056559B1 EP 1056559 B1 EP1056559 B1 EP 1056559B1 EP 99959484 A EP99959484 A EP 99959484A EP 99959484 A EP99959484 A EP 99959484A EP 1056559 B1 EP1056559 B1 EP 1056559B1
Authority
EP
European Patent Office
Prior art keywords
ingot mould
slot
metal
casting
cooled
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
EP99959484A
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English (en)
French (fr)
Other versions
EP1056559A1 (de
Inventor
Eric Perrin
Gérard 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
USINOR SA
Original Assignee
Forges et Acieries de Dilling SA
USINOR SA
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
Application filed by Forges et Acieries de Dilling SA, USINOR SA filed Critical Forges et Acieries de Dilling SA
Publication of EP1056559A1 publication Critical patent/EP1056559A1/de
Application granted granted Critical
Publication of EP1056559B1 publication Critical patent/EP1056559B1/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
    • B22D11/04—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
    • B22D11/04—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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling

Definitions

  • the invention relates to a head of an ingot mold for continuous casting charge of a metallurgical product, such as a bloom, a billet or a steel slab.
  • continuous casting under load which in fact constitutes a improvement of the general continuous casting process is implemented in such a way that the meniscus (free surface of the cast metal) is carried over upstream of the level where the solidification of the metal inside begins of the mold head.
  • the usual copper tubular element of the ingot mold cooled by internal circulation of cooling water, is overcome, so perfectly joined, by an uncooled refractory riser thermally insulating serving as a reserve of molten metal supplied by the jet of poured from a distributor located above at a short distance.
  • the metal meniscus liquid settles there, during casting, inside the refractory riser, while solidification of the metal only begins at the element cooled metallic tubular, which, as in conventional continuous casting size and shape of the cast product.
  • the eddies in the liquid metal due to the casting jet are limited to the interior of the riser.
  • the flow of cast metal can thus be maintained in a relatively calm hydrodynamic state, which allows in particular to regularize the solidification profile of the steel in contact with the wall cooled in copper around the entire interior of the mold.
  • this household a gap of very small height (less than 1 mm and generally around 0.2 mm) between the refractory riser and the tubular element in copper and to produce, by through this slot, an injection of fluid, generally gas inert such as argon in the mold along its inner periphery.
  • fluid generally gas inert such as argon
  • This gas injection shears the solidification veil heterogeneous parasite that could form above against the interior wall of the refractory riser and thus create the conditions favorable to a solid and regular start of solidification at the level of the copper element cooled just below.
  • the object of the present invention is precisely to propose a solution making it possible to reduce or even completely eliminate these defects solidification in the corners of the cast products obtained.
  • the invention relates to a mold for continuous casting in charge of molten metals, comprising a metallic tubular element cooled in quadrangular shape defining the shape and size of the product cast and in which the molten metal solidifies on contact with the wall metallic interior cooled, said cooled tubular element being surmounted by an uncooled extension in heat-insulating refractory material defining a reserve of molten metal to solidify, an injection slot of a shearing fluid (in particular an inert gas under pressure, such as argon preferably) according to the inner periphery of the mold being formed between the cooled metal element and the refractory riser, ingot mold characterized in that it is provided with means for reducing the flow of shearing fluid in the corners.
  • a shearing fluid in particular an inert gas under pressure, such as argon preferably
  • these means are constituted by a constituent element an obstacle to the passage of gas through the injection slot and placed in each of the angles of the slot.
  • the invention results from the following considerations. To get an effect satisfactory shearing of the gas flow injected at the base of the riser, it it is necessary to maintain a gas flow all along the slit so that it there are no dead zones on which solidification fragments undesirable would therefore persist. Now even if we feed the slot from a peripheral distributor of pressurized gas, thus ensuring losses equal load and. Therefore. constant outgoing line flow over the entire slot length, however, no gas flow is obtained injected equal at every point of the perimeter of the cast product. We observe indeed an overflow of gas in the corners of the mold due to the fact that the slot of course being of the same rectangular shape as the mold, the interior of it is supplied with gas bidirectionally in its zones angle.
  • Figure 1 is a schematic half-view, in axial section, of the upper part of the mold. according to plan1-1 of figure 3.
  • Figure 2 is a schematic half-view in axial section of the part upper part of the mold, along plane 2-2 of figure 3.
  • FIG. 3 is a top view of the lower part of the mold, according to plan 3-3 of Figure 1 or Figure 2.
  • the cooled metallic element 6 and the refractory riser 5 delimit, in their internal part, an internal casting space 3 in which one realizes casting and solidifying a molten metal 4 such as steel.
  • the internal casting space 3 has a square cross section with rounded angles, the radius of which has voluntarily exaggeratedly enlarged to better show the constituent elements of the invention which will be specified again thereafter.
  • the cooled copper tubular element 6 constitutes the element main of the mold. It is he who, being energetically cooled by an internal circulation of water (which is established here in a space 2 that household a metal jacket 8 surrounding the element 6 from a distance, conventionally serves crystallizer, against the inner wall 11 of which solidifies the molten steel 7 by first forming a first skin 7 'from the first contact with cold copper 11. Then, as the poured product progresses down in the mold in the direction indicated by the arrow F, this skin, under the effect of intense caloric pumping due to cooling force of the copper element 6, thickens more and more.
  • Solidification of the cast product 7 thus progresses from the periphery towards the central axis until complete solidification, which typically occurs at around ten meters below the mold, water spraying ramps are provided at this effect as a result of this to directly spray the surface of the product poured to cool.
  • a specific component of the so-called “in charge ", its essential function is to serve as a reserve 4 of molten metal.
  • This metal arrives by a casting jet 12 from a distributor 14 placed a short distance above and brought by a nozzle 13 mounted on the distributor outlet.
  • Reserve 4 constitutes a buffer mass, which has a determining role in terms of hydrodynamics by allowing often violent eddies of liquid metal due to the high amount of movement of the steel jet 12 to develop there freely and therefore to cushion.
  • the liquid steel which then arrives in the crystallizer 6 to be there solidify is in a much calmer state and above all distant from the meniscus 15, whose agitation is often the source of solidification heterogeneities extreme skin in a conventional continuous casting mold.
  • the flow of molten metal approaches a "piston" type flow, that is to say without marked vector gradient speed in the section, which is extremely favorable for the good accomplishment of the solidification process.
  • the extension of refractory material 5 generally comprises - but not shown in the figures - a main upper part in one fibrous refractory material chosen for its heat-insulating qualities in order to keep the reserve of molten metal 4 in the liquid state, for example the material sold under the name A120K by the firm KAPYROK and a lower annular insert chosen from a dense refractory material, such as than SiAION ® to ensure better mechanical strength in the vicinity immediate of the cooled copper element 6 solicited by the start of solidification.
  • extension is fixed in a well aligned position with the tubular element 6 by means of centering pins not shown and an assembly flange 9 with a tie 9 ', this flange bearing on a plate metal 5a covering the refractory part.
  • a sheet metal box 10 is advantageously provided for the passage of the tie rods and to stiffen the mounting.
  • parasitic solidification films 16 of cast metal more or less extensive may form on the inner wall of the extension. Even located around the edge, they can be harmful to the good solidification process in crystallizer 6 as long as these fragments 16 manage to extend to the level of the edge of the cooled element 6 where solidification begins.
  • a gas will be used in this connection, and more preferably a chemically inert gas with respect to the cast metal, such as argon.
  • a slot 18, of small thickness, for example of the order of 0.2 mm, is provided between the extension 5 and the cooled copper element 6.
  • This slot opens freely towards the inside of the mold and opens out its other end in a sealed annular chamber 19 formed in enhances it.
  • This chamber 19, which runs along the slot 18 all along, serves well distribute the linear flow of gas to exit the slot. It is connected by a pipe 20 to an external source of pressurized gas 21.
  • the slot 18 has an annular shape similar to the quadrangular shape of the mold, therefore that which takes the cast product 7 once solidified into skin within the copper element 6. In particular, it therefore has an outline at four angles, as shown in Figure 3, where the rounding of the angles has was deliberately exaggerated for the aforementioned reasons.
  • Obstruction elements 17. placed in corners of the gap 18, may consist of balls of fibrous refractory material flexible which, after tightening the extension against the top of the metal element 6, locally block the passage by crushing, outside to inside of the mold.
  • Each of the obstructing elements 17 is then advantageously delimited towards the outside by the internal contour of the distribution chamber 19, inwards by an angle of the space of casting 3, and laterally by two straight sides converging in the direction of the casting space 3, making an angle ⁇ with the perpendicular to the flat internal surface of the casting space 3, at the corresponding end the rounded angle 3a (or 3b, 3c, 3d, respectively) of the casting space delimiting inwardly the obstruction element 17.
  • the width of the obstruction element 17, in its smallest area, adjacent to an angle of the pouring space should preferably be between 4 and 6.5 mm. If this width is less at 4 mm, it is difficult to remove the local gas overflow injected into the corner. In case the width is more than 6.5 mm, there is an area in the vicinity of the angle, where the linear flow rate of injected gas is zero.
  • the angle ⁇ between the rectilinear side of the obstruction element 17 and the perpendicular to the internal surface of the casting space will be advantageously between 0 and 45 °.
  • the linear flow of gas injected i.e. the flow rate per unit length of the interior contour of the ingot mold at the level of the slot 18 cancels in an area in the vicinity of the angles.
  • the angle ⁇ close to 20 ° allows to obtain a constant linear flow rate according to the interior periphery of the mold, in the case of pouring rectangular or square products.
  • the two straight lateral sides of the blocking elements 17 can make angles ⁇ and ⁇ 'different with the perpendiculars to the planar internal surface of the internal casting space 3, at the ends of the angles.
  • the invention is not limited to the embodiment which has been described.
  • different materials of refractory fibers in its corner areas, different materials of refractory fibers. These elements can be completely impermeable to gas, or even slightly porous.
  • the extra thickness area will have a shape similar to the shape of the blocking elements 17 as shown in Figure 3. This extra thickness may preferably be of the order of 0.2 mm.
  • the obstruction of the distribution chamber can be produced, for example, by introducing in the corner areas of the distribution chamber of the plugs traversed by channels in the direction of gas flow in the distribution chamber or caps with a certain porosity.
  • the invention applies to any multi-angle mold head continuous casting in charge of a metallurgical product, such as a billet, bloom or slab, preforms of shape already close to the product finished (beams, rails, various profiles, ). Furthermore, it may apply both in the case of continuous steel casting and in the case of continuous casting of non-ferrous metals.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Confectionery (AREA)
  • Formation And Processing Of Food Products (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Mold Materials And Core Materials (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Claims (6)

  1. Stranggusskokille für metallurgische Produkte, die ein röhrenförmiges, gekühltes Element (6) aus Metall mit einer vieleckigen Form umfasst, welche die Form und Größe des gegossenen Produkts bestimmt, und bei dem die Metallschmelze (7) beim Kontakt mit der gekühlten metallischen Innenwand (11) erstarrt, wobei über dem röhrenförmigen, gekühlten Element ein nicht gekühlter Aufbautrichter (5) aus wärmeisolierendern, feuerfesten Material angeordnet ist, der eine Reserve an zu erstarrender Metallschmelze bildet, wobei entlang dem inneren Umfang der Kokille zwischen dem gekühlten Metallelement (6) und dem feuerfesten Aufbautrichter (5) ein Spalt (18) zum Einspritzen eines Schneidfluids vorgesehen ist, eine Kokille, die dadurch gekennzeichnet ist, dass sie mit Mitteln (17) zur Reduzierung der Schneidfluidmenge in den Ecken versehen ist.
  2. Kokille nach Anspruch 1, dadurch gekennzeichnet, dass die Mittel zur Verringerung der Gasmenge von Elementen (17) zum lokalen Verstopfen der Durchlassöffnung des Spalts (18) gebildet werden.
  3. Kokille nach Anspruch 2, dadurch gekennzeichnet, dass die Elemente (17) zum Verstopfen jeweils von einer Kugel aus faserartiger feuerfester Masse gebildet werden, die zwischen dem Aufbautrichter (5) und dem röhrenförmigen, gekühlten Element (6) zusammengedrückt und jeweils in einer Eckzone (3a...3d) des Spalts (18) platziert wird.
  4. Kokille nach einem der Ansprüche 2 und 3, dadurch gekennzeichnet, dass die Elemente (17) zum Verstopfen jeder Eckzone des Spalts (18) zwei gerade Seitenflächen zwischen der Verteilungskammer (19) und einer Ecke (3a, 3b, 3c, 3d) einer Innenfläche des Gussinnenraums (3) aufweisen, die in Richtung auf den Gussraum (3) konvergieren und jeweils mit einer Senkrechten zur Gussinnenraumfläche (3) nahe einer Ecke (3a, 3b, 3c, 3d) der Gussinnenraumfläche (3) einen Winkel von 0 bis 45° bilden.
  5. Kokille nach einem der Ansprüche 2, 3 und 4 und mit abgerundeten Ecken mit einem Radius von annähernd 6,5 mm, dadurch gekennzeichnet, dass die Elemente zum Verstopfen (17) eine zum Gussraum (3) gewandte Seite einer Breite von 4 bis 6,5 mm aufweisen.
  6. Kokille nach Anspruch 1, dadurch gekennzeichnet, dass die Mittel zur Reduzierung der Gasmenge von Elementen zum parziellen Verstopfen der Ecken des Einspritzspalts (18) gebildet werden.
EP99959484A 1998-12-18 1999-12-16 Vieleckige stranggiesskokille für metallurgische produkte Expired - Lifetime EP1056559B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9816055 1998-12-18
FR9816055A FR2787359B1 (fr) 1998-12-18 1998-12-18 Lingotiere pluriangulaire de coulee continue en charge d'un produit metallurgique
PCT/FR1999/003166 WO2000037197A1 (fr) 1998-12-18 1999-12-16 Lingotiere pluriangulaire de coulee continue en charge d'un produit metallurgique

Publications (2)

Publication Number Publication Date
EP1056559A1 EP1056559A1 (de) 2000-12-06
EP1056559B1 true EP1056559B1 (de) 2003-07-30

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ID=9534174

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99959484A Expired - Lifetime EP1056559B1 (de) 1998-12-18 1999-12-16 Vieleckige stranggiesskokille für metallurgische produkte

Country Status (19)

Country Link
US (1) US6354363B1 (de)
EP (1) EP1056559B1 (de)
JP (1) JP2002532257A (de)
KR (1) KR20010034498A (de)
CN (1) CN1291122A (de)
AT (1) ATE246060T1 (de)
BR (1) BR9908047A (de)
CA (1) CA2320841A1 (de)
CZ (1) CZ20003009A3 (de)
DE (1) DE69909974D1 (de)
FR (1) FR2787359B1 (de)
MX (1) MXPA00007935A (de)
PL (1) PL342366A1 (de)
RU (1) RU2211743C2 (de)
SI (1) SI20311A (de)
SK (1) SK12102000A3 (de)
TR (1) TR200002392T1 (de)
WO (1) WO2000037197A1 (de)
ZA (1) ZA200004013B (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100561648B1 (ko) * 2003-11-17 2006-03-20 엘지.필립스 엘시디 주식회사 액정표시장치의 구동방법 및 구동장치
US7000676B2 (en) * 2004-06-29 2006-02-21 Alcoa Inc. Controlled fluid flow mold and molten metal casting method for improved surface

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1508931A1 (de) * 1966-08-20 1970-03-05 Benteler Geb Paderwerk Vorrichtung zum Kuehlen und Stuetzen des Gussstranges bei Stranggiessanlagen fuer Schwermetalle oder deren Legierungen,insbesondere Stahl
US5325910A (en) * 1985-09-20 1994-07-05 Vereinigte Aluminium-Werke Aktiengesellschaft Method and apparatus for continuous casting
CA1320334C (en) * 1988-12-08 1993-07-20 Friedrich Peter Mueller Direct chill casting mould with controllable impingement point
US5040595A (en) * 1989-08-14 1991-08-20 Wagstaff Engineering Incorporated Means and technique for direct cooling an emerging ingot with gas-laden coolant
JPH05318031A (ja) * 1992-05-12 1993-12-03 Yoshida Kogyo Kk <Ykk> 連続鋳造の冷却方法、同装置及び鋳型
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.
US5582230A (en) * 1994-02-25 1996-12-10 Wagstaff, Inc. Direct cooled metal casting process and apparatus
FR2747063B1 (fr) * 1996-04-05 1998-05-22 Ugine Savoie Sa Lingotiere de coulee continue en charge verticale des metaux
FR2747062B1 (fr) * 1996-04-05 1998-04-30 Ugine Savoie Sa Lingotiere de coulee continue pour la coulee continue en charge verticale des metaux

Also Published As

Publication number Publication date
SI20311A (sl) 2001-02-28
TR200002392T1 (tr) 2000-12-21
EP1056559A1 (de) 2000-12-06
CZ20003009A3 (cs) 2001-10-17
MXPA00007935A (es) 2003-09-10
DE69909974D1 (de) 2003-09-04
JP2002532257A (ja) 2002-10-02
WO2000037197A8 (fr) 2000-10-12
BR9908047A (pt) 2000-10-31
FR2787359B1 (fr) 2001-10-12
KR20010034498A (ko) 2001-04-25
CN1291122A (zh) 2001-04-11
SK12102000A3 (sk) 2002-09-10
RU2211743C2 (ru) 2003-09-10
ZA200004013B (en) 2002-05-06
CA2320841A1 (fr) 2000-06-29
PL342366A1 (en) 2001-06-04
ATE246060T1 (de) 2003-08-15
US6354363B1 (en) 2002-03-12
FR2787359A1 (fr) 2000-06-23
WO2000037197A1 (fr) 2000-06-29

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