EP0477045B1 - Zweiwalzenstranggiessanlage - Google Patents

Zweiwalzenstranggiessanlage Download PDF

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Publication number
EP0477045B1
EP0477045B1 EP91402212A EP91402212A EP0477045B1 EP 0477045 B1 EP0477045 B1 EP 0477045B1 EP 91402212 A EP91402212 A EP 91402212A EP 91402212 A EP91402212 A EP 91402212A EP 0477045 B1 EP0477045 B1 EP 0477045B1
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EP
European Patent Office
Prior art keywords
disc portion
disc
casting
refractory material
central part
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
EP91402212A
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English (en)
French (fr)
Other versions
EP0477045A1 (de
Inventor
Jean-Pierre Birat
Philippe Blin
Christophe Ganser
Yves Grandgenevre
Jean-Luc Jacquot
Jacques Spiquel
Laurent Sosin
Jean-Bernard Veyret
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.)
Thyssen Stahl AG
USINOR SA
Original Assignee
Thyssen Stahl AG
USINOR Sacilor 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 Thyssen Stahl AG, USINOR Sacilor SA filed Critical Thyssen Stahl AG
Publication of EP0477045A1 publication Critical patent/EP0477045A1/de
Application granted granted Critical
Publication of EP0477045B1 publication Critical patent/EP0477045B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/0648—Casting surfaces
    • B22D11/066—Side dams

Definitions

  • the present invention relates to the continuous casting of metals, in particular steel, between two cylinders of parallel axes driven in rotation in opposite directions, to obtain thin products.
  • a side wall comprising at least one lateral part, for example metallic, facing the flat front surface of a cylinder, and the facing surface of the casting space is an extension of the surface of said cylinder, and is connects to a front part of said wall, recessed therein with respect to the side part, so as to form in the wall a hollow area laterally extending the casting space.
  • the present invention proposes to provide another solution to the problem mentioned above.
  • the invention relates to a continuous casting installation between two cylinders with parallel axes defining between them and with two fixed side walls a casting space for a molten metal, each side wall comprising at least a lateral part, placed against the flat front end surface of one of the cylinders, and consisting of a disc portion of outside diameter equal to that of said adjacent cylinder, and a central part, facing said casting space, in insulating refractory material, said disc portion being made of a material having good thermal conductivity and mechanical strength characteristics greater than those of said refractory material, this installation being characterized in that this portion is a tapered disc portion whose face having the greatest radius of curvature is located towards the cylinder, and the frustoconical surface is cont act of insulating material of said central part.
  • the disc portion opposite the front end surface of the cylinder being resistant to friction, it can be pressed against the cylinder with sufficient force to ensure the seal, without risk of deterioration or wear.
  • the central part in insulating material avoids an excessive solidification of the metal and the formation of the corner mentioned at the beginning of this thesis. During casting, this central part can be worn by the metal which digs it, but in doing so the metal which penetrates into the hollow thus formed approaches the frustoconical surface of the disc portion, kept at low temperature among other things due to its thermal conductivity and its proximity to the cooled surfaces of the cylinders.
  • this metal solidifies on the surface, the wall thus solidified hooks into the insulating refractory material and forms a sort of slide in which the liquid metal can flow to the level of the neck between the cylinders, where, solidified, it constitutes the edge of the product.
  • the constitution of the side wall according to the invention makes it possible, at the start of casting, to form an autocreuset, constituted by the skin of metal solidified in the insulating refractory material, which stabilizes due to the proximity of the disc portions, thus prevents the progression of wear of said refractory material, and thus allows the continuation of the casting.
  • the horizontal section of this self-crucible near the neck takes on a C shape, the thickness of the branches decreasing towards their ends, so that the spacing between these branches is substantially constant , which makes it possible to obtain the edges of the cast product of thickness substantially equal to the thickness of the central zone thereof.
  • the frustoconical surface of the disc portion may include asperities, such as spikes, which improve the attachment of the insulating material and therefore the maintenance of the autocreuset on its edges.
  • the central part of insulating refractory material can be made up of several of these materials arranged in successive layers having mechanical resistance and / or thermal insulation characteristics varying gradually from the material located towards the casting space. , which has the highest insulation coefficient.
  • the disc portions may be coated or made of a material resistant to heat and having in particular good mechanical strength at high temperature, such as zirconia, and more can be cooled, by example by internal circulation of a cooling fluid.
  • the continuous casting installation between cylinders partially shown in FIG. 1, comprises two cylinders 1 and 2 with parallel and horizontal axes, driven in rotation and two lateral walls for closing the casting space, such as wall 3 , located towards the ends of the cylinders and held against the front surfaces 4, 5 of the cylinders.
  • the side wall 3 shown in Figure 1 in section along a horizontal plane at the axes of the cylinders and in front view in Figure 2, has two side parts 6 each consisting of a portion of frustoconical disc of larger outside diameter equal to that of the cylinders, so that the face 7 of these portions of discs having the greatest radius of curvature is located against the front surface 4, 5 of the adjacent cylinder, and that the edge 9 of the bevel formed by the frustoconical surface 8 and the face 7 of these portions of sic is facing the edge formed by the edge of the cylindrical surface 10 of the corresponding cylinder.
  • the angle of the bevel that is to say the angle at the base of the portion of frustoconical disc is 5 to 85 degrees, and preferably about 30 °.
  • the disc portions constituting the lateral parts 6 of the closure wall 3 are made of a material having good mechanical characteristics, resistant to wear, and preferably having a low coefficient of friction to limit the forces due to the possible friction of the cylinders on these portions of discs. We could for example make them out of cast iron, steel, copper, molybdenum or one of their alloys and reduce friction by lubrication.
  • the mechanical resistance of the material constituting the disc portions also makes it possible to avoid the deterioration of these if, following the wear of the insulating refractory, the cast metal, in the course of solidification, comes into contact with them. The progression of wear is stopped or at least greatly slowed down, and metal infiltration between these disk portions and the cylinders is thus avoided.
  • the disc portions 6 may also, in the vicinity of the edge 9, be coated or made of a material having a particularly high mechanical resistance at high temperature and preferably unlikely to be wetted by the molten molten metal, and inert to the contact of the liquid steel to avoid deterioration of the edges 9 of the disk portions, or the attachment of cast metal thereon, in the event that molten metal is brought, during casting, into contact with said edges. It is possible, for example, to use a ceramic deposit (for example zirconia) on a metallic or ceramic substrate, or to produce the disc portion in the form of a monolithic piece of ceramic or composite ceramic, or else to use an antioxidant coating.
  • a ceramic deposit for example zirconia
  • these disc portions can be cooled, for example by circulation of a cooling fluid in channels 11 produced in the disc portions, the cooling thus caused having to be sufficient to maintain the region near the edge at a temperature lower than that where damage could occur, without having a cooling effect on the cast metal.
  • an insulating refractory material 12 in tight contact with the frustoconical surfaces 8 of the disc portions 6.
  • This central part in insulating refractory material is contained towards the rear of the wall 3 by a support plate 13, on which the disk portions 6 are fixed.
  • the frustoconical surface of these is provided with asperities, such as pins 14 which penetrate into said insulating refractory material, or hollows, produced for example by drilling, into which said material penetrates.
  • the central part 12 preferably comprises an overhang 15 relative to the plane of the faces 7 of the disc portions, which is inserted between the cylinders.
  • the insulating refractory material has a thermal conductivity of less than 0.35 W / mK, that is to say that it must be sufficiently insulating to avoid solidification of the metal on contact, and have good dimensional stability during large temperature variations.
  • a fibrous refractory for example composed of alumina fibers impregnated with zirconia gel (for example of the type marketed under the name of Procelit or Procal).
  • FIG. 3a represents, on an enlarged scale, the central zone of the side wall before the start of the casting in a plane situated slightly above the neck between the rolls. We therefore see the wall and the overhang 15 which penetrates slightly between the cylinders.
  • the cast metal 22 After a relatively short casting time, the cast metal 22 has worn off the insulating refractory material by removing the overhang 15 and slightly digging the central part, as shown in FIG. 3b.
  • the metal continues to dig the insulating refractory and creates in it a cavity 16 of rounded section.
  • the solidified skin 17 which then forms in this cavity clings to the insulating refractory material, forming the autocreuset mentioned above.
  • the autocreuset 17 occupies in the insulating refractory material a larger space than that existing, at the same level, between the cylinders. This extra width is authorized by the particular constitution of the side walls according to the invention, and in particular by the fact that the disc portions 6 are frustoconical.
  • this extra width of the autocreuset allows the edges of the cast product to retain a thickness substantially equal to the general thickness of the product. It will indeed be understood that the edges of the final product are obtained from the metal being solidified which moves, simultaneously with the metal passing between the cylinders, in the vertical gutter formed by the autocreuset which is fixed to it relative to the wall lateral.
  • the autocreuset once the autocreuset has been formed, it protects the insulating refractory material from direct contact with the molten metal, preventing the progression of its wear, which makes it possible to ensure the stability of the process for the pursuit of casting.
  • FIGS. 4 and 5 the side wall has been shown in established casting conditions, respectively in plan and in horizontal section at the level of the line. , located clearly above the pass.
  • the depth and the width of the wear marks 18 increase downwards, until they meet to form the cavity 16, shown in FIG. 3c, seat of the autocreuset 17.
  • the formation and stability of the autocreuset results from the thermal equilibrium which is established between the cast metal and the various parts of the installation and in particular of the side wall.
  • the insulating refractory material, in contact with which the molten metal is brought to the start of the casting must be very insulating to prevent premature solidification of said metal between the edges of the rolls.
  • the autocreuset, once formed, be as stable as possible.
  • the central part of the wall can be produced in the form of a composite part shown in FIG.
  • the last layer, or the support plate itself, constitutes a safety plate to avoid any risk of flow of molten metal in the event of breakthrough of the autocreuset.
  • They may for example be made of a hard material which does not deform by expansion, such as silica.
  • the portions of discs comprise in their lower part close to the neck between the cylinders, a clearance 19 consisting in removing, at the bottom of the side wall, the bevelled part of said disc portions , this clearance being filled by a widening 20 corresponding to an insulating refractory material, which is consequently in contact with the front faces of the cylinders over the height of this clearance.
  • the presence of the insulating material, softer than the material making up the disc portions allows the edges of the product, solidified near the neck, to flourish outside the grip of the cylinders. The rolling force at the neck and at the edges of the rolls can thus be reduced, which prevents deterioration of said rolls. edges.
  • the height of this clearance, above the neck will preferably be close to a length of arc ⁇ of 2 ° measured at the periphery of the cylinders.
  • the disc portions are released in the same area as above only over part of their thickness, leaving a thinned part 21 of disc in contact with the cylinders, which avoids direct contact of the refractory material with the cylinders, while largely retaining the possibility of the opening of the edge of the cast product, mentioned above.
  • FIG. 10 there is shown, in section at the neck, an application of the invention in the case of casting between two axially offset cylinders, for example in an installation allowing the casting of products of variable width by relative axial displacement of the cylinders.
  • the side wall is not symmetrical, as in the previous examples, with respect to the median plane P of the installation parallel to the axes of the cylinders.
  • This wall 30 is formed on the side where it is in contact with the front face of the cylinder 1 ′ (lower part of the drawing in FIG. 10), in the same way as in the examples described above, and comprises a portion of frustoconical disc 6 'fixed on a support plate 13', and a central part 12 'of insulating refractory material.
  • the other side of the wall 30 (upper part of FIG.
  • a tongue 31 placed against the cylindrical surface of the cylinder 2 ', for example of the same material as the disc portion 6', this tongue also being in bevel, shaped to match the curvature of the cylinder 2 ', and also fixed to the support plate 13'.
  • the material insulating refractory 12 ' fills the space between the disc portion 6' and the metal tongue 31.
  • This side wall is in fact equivalent to that of the variant, adapted to axially offset cylinders, of the wall described in the French patent application No. 2652021 already cited, to which reference may be made for more details, and to which applied the principle of the wall according to the present invention.
  • FIG. 10 allows the axial displacement of the cylinder 2 'relative to the cylinder 1' and to the wall 30, allowing the width of the cast product to be varied.
  • the invention is not limited to the examples and variants described above, and includes any provisions resulting from the combination of said examples or variants.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Moulding By Coating Moulds (AREA)
  • Body Structure For Vehicles (AREA)
  • Crushing And Grinding (AREA)
  • Handcart (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Building Environments (AREA)
  • Vehicle Body Suspensions (AREA)

Claims (13)

  1. Zweiwalzenstranggießanlage mit zwei Walzen (1, 2) zwischen deren parallelen Achsen und durch zwei feste Seitenwände ein Geißraum eines schmelzflüssigen Metalls festgelegt ist, wobei jede Seitenwand (3) wenigstens ein laterales Teil (6), das gegen eine frontale Oberfläche (4, 5) einer Außenfläche einer der Walzen angeordnet und durch einen Scheibenabschnitt gebildet ist, dessen äußerer Durchmesser dem der anstoßenden Walze entspricht, und ein zentrales Teil (12), das gegenüber dem Gießraum angeordnet ist, und aus feuerfestem isolierendem Material besteht, aufweist, und wobei der Scheibenabschnitt aus einem thermisch leitfähigem Material und gegenüber dem feuerfesten Material aus einem Material mit höherer mechnischer Festigkeit besteht,
    dadurch gekennzeichnet,
    daß der Scheibenabschnitt ein Kegelstumpf (6) ist, dessen einen größeren Krümmungsradius aufweisende Seite zur Walze hin angeordnet ist, und daß die Kegelstumpffläche (8) in Kontakt mit dem isolierenden Material des zentralen Teils steht.
  2. Anlage nach Anspruch 1, dadurch gekennzeichnet, daß der Winkel an der Basis des kegelstumpfförmigen Scheibenabschnittes (6) zwischen 5° und 85 ° beträgt.
  3. Anlage nach Anspruch 1, dadurch gekennzeichnet, daß das feuerfeste isolierende Material eine Aluminiumfaser ist.
  4. Anlage nach Anspruch 1, dadurch gekennzeichnet, daß das zentrale Teil durch mehrere lagen (12a, 12b, 12c) aus einem Material mechanischer Festigkeit, die von der Lage (12a), die zum Gießraum hin angeordnet ist, ansteigt, gebildet ist.
  5. Anlage nach Anspruch 1, dadurch gekennzeichnet, daß die Scheibenabschnitte aus Gußeisen, Stahl, Kupfer, Molybdän oder aus einer ihrer Legierungen bestehen.
  6. Anlage nach Anspruch 1, dadurch gekennzeichnet, daß die Kegelstumpf-Flächen der Scheibenabschnitte Unebenheiten (14) aufweisen.
  7. Anlage nach Anspruch 1, dadurch gekennzeichnet, daß die Scheibenabschnitte in der Zone ihres größten Durchmessers mit oder durch ein Material mit guter mechanischer Haltbarkeit bei hohen Temperaturen versehen bzw. gebildet sind.
  8. Anlage nach Anspruch 7, dadurch gekennzeichnet, daß das Material Zirkonium ist.
  9. Anlage nach Anspruch 1, dadurch gekennzeichnet, daß die Scheibenabschnitte gekühlt sind.
  10. Anlage nach Anspruch 1, dadurch gekennzeichnet, daß die Scheibenabschnitte in einer an den Kragen zwischen den Walzen angrenzenden Zone eine Räumung (19) aufweisen, die durch ein feuerfestes isolierendes Material (20) ausgefüllt ist.
  11. Anlage nach Anspruch 10, dadurch gekennzeichnet, daß die Räumung auf der ganzen Dicke des Scheibenabschnittes ausgeführt ist.
  12. Anlage nach Anspruch 10, dadurch gekennzeichnet, daß die Räumung in einen dicken Abschnitt des Scheibenabschnittes eingebracht ist, die einen verdünnten Abschnitt (21) dieses Abschnittes der Scheibe, die in Kontakt mit der Walze steht, stehen läßt.
  13. Anlage nach Anspruch 1, dadurch gekennzeichnet, daß das zentrale Teil (12) einen Vorstoß (15) aufweist, der zwichen die Walzen hineinragt.
EP91402212A 1990-09-03 1991-08-08 Zweiwalzenstranggiessanlage Expired - Lifetime EP0477045B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9011000 1990-09-03
FR9011000A FR2666256B1 (fr) 1990-09-03 1990-09-03 Installation de coulee continue entre cylindres.

Publications (2)

Publication Number Publication Date
EP0477045A1 EP0477045A1 (de) 1992-03-25
EP0477045B1 true EP0477045B1 (de) 1995-03-29

Family

ID=9400075

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91402212A Expired - Lifetime EP0477045B1 (de) 1990-09-03 1991-08-08 Zweiwalzenstranggiessanlage

Country Status (16)

Country Link
US (1) US5172750A (de)
EP (1) EP0477045B1 (de)
JP (1) JP2949122B2 (de)
AT (1) ATE120392T1 (de)
AU (1) AU647169B2 (de)
CA (1) CA2050112C (de)
DE (1) DE69108496T2 (de)
DK (1) DK0477045T3 (de)
ES (1) ES2074241T3 (de)
FI (1) FI94103C (de)
FR (1) FR2666256B1 (de)
IE (1) IE913086A1 (de)
NO (1) NO178820C (de)
PT (1) PT98844A (de)
TW (1) TW222599B (de)
ZA (1) ZA916945B (de)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2686278A1 (fr) * 1992-01-17 1993-07-23 Usinor Sacilor Dispositif de coulee continue entre cylindres comportant des parois laterales en materiaux refractaires.
FR2688721B1 (fr) * 1992-03-18 1994-06-17 Usinor Sacilor Dispositif de coulee continue d'un produit metallique entre cylindres.
FR2699436A1 (fr) * 1992-12-17 1994-06-24 Usinor Sacilor Dispositif de coulée continue entre cylindres de produits métalliques minces.
FR2765504B1 (fr) * 1997-07-04 1999-08-20 Usinor Face laterale d'obturation de l'espace de coulee d'une installation de coulee continue entre cylindres de bandes minces metalliques
FR2842130B1 (fr) * 2002-07-12 2004-10-15 Usinor Face laterale pour installation de coulee continue de bandes metalliques entre deux cylindres
CH696138A5 (de) * 2002-10-04 2007-01-15 Main Man Inspiration Ag Dichtplatte zur Seitenabdichtung eines zwischen zwei Giessrollen einer Bandgiessmaschine gebildeten Giessspaltes.
CH697156A5 (de) * 2004-09-17 2008-05-30 Main Man Inspiration Ag Seitenabdichtung eines zwischen zwei Giessrollen einer Bandgiessmaschine gebildeten Giessspaltes.
US8191610B2 (en) * 2008-11-24 2012-06-05 Nucor Corporation Strip casting apparatus with improved side dam
US10046384B2 (en) 2015-09-30 2018-08-14 Nucor Corporation Side dam with pocket

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0403412A1 (de) * 1989-06-15 1990-12-19 Usinor Sacilor Seitenwand für eine Stranggiessvorrichtung mit beweglichen Wänden

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6326244A (ja) * 1986-07-16 1988-02-03 Kawasaki Steel Corp 薄鋳片連続鋳造用固定短辺
JPH01162545A (ja) * 1987-12-21 1989-06-27 Kawasaki Steel Corp 薄鋳片連続鋳造機の短辺側板
EP0348227B1 (de) * 1988-06-24 1993-05-05 Kawasaki Steel Corporation Begrenzungswand für Bandstranggiessanlagen
FR2636259B1 (fr) * 1988-09-14 1994-03-11 Irsid Paroi laterale pour une installation de coulee continue entre parois mobiles et installation comportant cette paroi
FR2655577B1 (fr) * 1989-12-07 1992-01-24 Siderurgie Fse Inst Rech Installation de coulee continue de produits metalliques minces entre deux cylindres.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0403412A1 (de) * 1989-06-15 1990-12-19 Usinor Sacilor Seitenwand für eine Stranggiessvorrichtung mit beweglichen Wänden

Also Published As

Publication number Publication date
NO913375L (no) 1992-03-04
EP0477045A1 (de) 1992-03-25
ZA916945B (en) 1993-04-28
PT98844A (pt) 1993-11-30
ATE120392T1 (de) 1995-04-15
CA2050112C (fr) 1999-02-23
FI914111A0 (fi) 1991-09-02
TW222599B (de) 1994-04-21
JP2949122B2 (ja) 1999-09-13
FI94103B (fi) 1995-04-13
CA2050112A1 (fr) 1992-03-04
FI94103C (fi) 1995-07-25
FR2666256B1 (fr) 1992-10-16
US5172750A (en) 1992-12-22
FI914111A (fi) 1992-03-04
FR2666256A1 (fr) 1992-03-06
IE913086A1 (en) 1992-03-11
AU8276891A (en) 1992-03-05
DK0477045T3 (da) 1995-08-21
NO178820C (no) 1996-06-12
DE69108496D1 (de) 1995-05-04
DE69108496T2 (de) 1995-08-03
NO178820B (no) 1996-03-04
JPH05123832A (ja) 1993-05-21
AU647169B2 (en) 1994-03-17
NO913375D0 (no) 1991-08-28
ES2074241T3 (es) 1995-09-01

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