EP0588743B1 - Vorrichtung zum Stranggiessen von dünnen metallischen Produkten zwischen Zylindern - Google Patents

Vorrichtung zum Stranggiessen von dünnen metallischen Produkten zwischen Zylindern Download PDF

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Publication number
EP0588743B1
EP0588743B1 EP93470022A EP93470022A EP0588743B1 EP 0588743 B1 EP0588743 B1 EP 0588743B1 EP 93470022 A EP93470022 A EP 93470022A EP 93470022 A EP93470022 A EP 93470022A EP 0588743 B1 EP0588743 B1 EP 0588743B1
Authority
EP
European Patent Office
Prior art keywords
layer
rolls
side wall
self
cylinders
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
EP93470022A
Other languages
English (en)
French (fr)
Other versions
EP0588743A1 (de
Inventor
Jacques Barbe
Pierre Delassus
Luc Vendeville
Jean-Michel Damasse
Jean-Marie Osswald
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 EP0588743A1 publication Critical patent/EP0588743A1/de
Application granted granted Critical
Publication of EP0588743B1 publication Critical patent/EP0588743B1/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
    • B22D11/0665—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating
    • B22D11/0668—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating for dressing, coating or lubricating
    • 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 a continuous casting device according to the preamble of claim 1.
  • Such devices are already known and used in particular for obtaining thin metallic products, such as sheets or strips, in particular made of steel.
  • each side wall with rollers or balls brought into contact with the sides of the cylinders by elastic support means acting on the rear of the side walls. and so as to define an operating clearance between the edges of the cylinders and the active surface, on the side of the casting space, of the side walls.
  • Such an arrangement is however complex.
  • the raceway of the rollers or balls cannot be located just at the periphery of the cylinders. As the expansion of the cylinders may be different between the periphery and the area of the raceway, it follows that said operating clearance may vary during casting.
  • mops side walls comprising, facing the edges of the cylinders, frustoconical disc portions, called “mops" by analogy of shape, made of a material having specially adapted thermal and mechanical characteristics, different refractory material located between these mops and in contact with the liquid metal.
  • mops are either permanently pressed against the sides of the cylinders, or kept away from them with a slight cold clearance before casting and at the start of casting, but liable to come into contact during the expansion of the cylinders in progress. of casting. In both cases, an injection of lubricant at the interface is necessary.
  • the present invention aims to solve the problems mentioned above, to remove the supply of lubricant, whether by injection of a liquid lubricant or by depositing a solid or pasty lubricant, and to facilitate the installation of the device and / or the replacement of the side walls.
  • the invention relates to a continuous casting device between cylinders of thin metallic products, in particular steel, comprising two cooled cylinders driven in rotation and two side walls pressed against the front ends of the cylinders and delimiting with those -this a liquid metal pouring space, comprising, in the zones where the side walls face the front ends of the cylinders, means for reducing the friction between them, characterized in that said means consist of a layer of solid, self-lubricating material.
  • self-lubricating solid material generally designates any solid material with a low coefficient of friction, which cannot be consumed under normal conditions of use.
  • the injection of liquid lubricant is eliminated.
  • the thickness of said layer defines a fixed clearance between the edges of the cylindrical surfaces of the cylinders and the side walls, even when said cylinders expand axially at the periphery.
  • this material is a self-lubricating plastic material, such as polytetrafluoroethylene (PTFE) known under the name teflon, or alternatively perfluorinated polyethylene ethylenepropylene (FEP) or diallylisophthalate, or other similar self-lubricating plastics.
  • PTFE polytetrafluoroethylene
  • FEP perfluorinated polyethylene ethylenepropylene
  • diallylisophthalate or other similar self-lubricating plastics.
  • said layer consists of a localized coating of the side wall.
  • said layer is formed by a part, projecting relative to the surface of the side wall, of a plate fixed in a groove of said side wall.
  • said layer is discontinuous and formed by a plurality of studs spaced apart from each other.
  • each stud is formed by the end of a sliding bar in a bore in the side wall, perpendicular to the surface of the latter, and adjustable in position.
  • said layer can also be fixed to the front walls of the cylinders.
  • Figure 1 shows the two cylinders 1, 2 of a casting device between cylinders, and a side wall 3 for closing the casting space 4.
  • the latter is poured according to arrow F into the casting space 4, solidifies on contact with the cooled walls of cylinders 1 and 2, and is extracted downwards during the rotation of the cylinders, according to arrows F1, to form a thin strip 5.
  • the side wall 3 is pushed towards the front ends 6, 7 of the cylinders, for example by elastic means, such as springs 8, or any other pressure means.
  • the wall 3 essentially consists of a plate of refractory material comprising a flat surface 9, at least in the zones 10, 11 where the side wall faces the cylinders.
  • the wall 3 comprises a coating 21 of a self-lubricating solid material.
  • This coating forms a continuous layer from top to bottom of the side wall 3 (fig. 3) on an annular sector 22 whose outside radius Re is slightly smaller than that of the cylinders and has a thickness of 0.01 to 0.1 mm.
  • the coating 21 is pressed against the front end surface 6, 7 of the cylinders, determining between the latter and the surface 9 of the side wall a clearance j1 of value equal to the thickness of the coating.
  • the clearance j2 is preferably 5 to 10 mm; but it can be reduced compared to these values, if not canceled, in the case where the nature of the coating 21 does not prohibitively prohibit any contact with the molten cast metal.
  • the coating 21 is preferably made of Teflon, or other self-lubricating plastic.
  • the self-lubricating qualities of this material result of the transfer of a thin oriented film of this material on the opposing surface in movement in contact with said material, which ensures very good sliding as soon as this transfer is achieved and virtually eliminates any subsequent consumption of said material.
  • a particular advantage of self-lubricating plastics is that it is possible to deposit them in a thin layer directly on the surface of the side wall facing the cylinder.
  • This coating can be produced by any known type of deposition process suitable for the material concerned, for example by chemical deposition, chemical or physical vapor deposition, etc.
  • FIG 4 there is shown a variant of the invention applied to a casting device having side walls 3 provided with disc portions such as those described in document FR 2666256 already cited in the introductory part.
  • the side wall 3 comprises a housing 31 provided with a recess in which is placed a plate 32 of refractory material, the flush surface 33 of which has a shape corresponding to the vertical cross section of the casting space 4 defined between the two cylinders 1 and 2.
  • This plate 32 is bordered on each side by portions of metal frustoconical discs 34, 35, also called “mops" fixed to the housing 31 by screws 36 shown only by their axes in FIG. 4.
  • These mops 34, 35 have an outer radius Re1 substantially equal to that of the cylinders, so that the edges 37 formed by their edges of larger radius face the edges 38 formed by the edges of the cylindrical walls of the cylinders.
  • the layer 21 of self-lubricating solid material is formed by a part of a plate 38 of this material, projecting from the surface 39 of the mop 34.
  • This plate 38 is held by anchoring in a groove 40 in dovetail machined in the mop. To avoid sliding of the plate 38 in the groove 39, the latter is closed downwards, to form a stop 41.
  • the layer 21 of self-lubricating solid material covers the entire surface 39 of the mop.
  • said layer preferably consists of a coating deposited according to one of the methods already mentioned in the description of the first variant.
  • the layer of self-lubricating solid material is discontinuous and consists of a plurality of studs 51 distributed over the height of the mop 34.
  • These studs can be circular, as shown in FIG. 7 and of diameter slightly less than the width of the mop.
  • each stud 51 is formed by the end of a bar 52 made of self-lubricating material, which can slide in a bore 53 machined in the pruning rod perpendicularly to the surface 39 thereof.
  • Each bar comprises means, not shown, for adjusting in axial position, in the direction of the arrows 54, so as to be able to adjust the overhang of these bars relative to the surface 39. This makes it possible to compensate for any wear of the studs, and also possibly to independently adjust the overhang of each stud.
  • the layer of self-lubricating solid material may also be fixed or deposited on the front walls of the cylinders, near their periphery, in the form of a continuous or discontinuous strip.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Rollers For Roller Conveyors For Transfer (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Rolls And Other Rotary Bodies (AREA)

Claims (12)

  1. Vorrichtung zum Stranggießen mittels Walzen dünner metallischer Gegenstände insbesondere aus Stahl, mit zwei gekühlten in Drehungen versetzbaren Walzen (1, 2) und zwei seitlichen, an den Stirnenden (6, 7) der Walzen anliegenden Wänden (3), welche mit ihnen einen Gießraum (4) für das flüssige Metall begrenzen und welche in den Bereichen (10, 11), in denen die seitlichen Wände (3) den Stirnenden (6, 7) der Walzen gegenüberliegen mit einer Anordnung zur Verringerung der Reibung zwischen ihnen versehen ist, dadurch gekennzeichnet, daß diese Anordnung aus einer Schicht (21) aus einem festen selbstschmierenden Material besteht.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Schicht aus einer örtlich begrenzten Beschichtung der seitlichen Wand besteht.
  3. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Schicht aus einem über die Oberfläche (39) der seitlichen Wand hinausragenden Abschnitt einer Platte (38) besteht, welche in einer Nut (40) der seitlichen Wand eingesetzt ist.
  4. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Schicht kontinuierlich auf einem ringförmigen Sektor (22) angebracht ist, der sich von oben nach unten in diesem Bereich erstreckt.
  5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß der ringförmige Sektor einen Radius (Re) aufweist, der gleich oder geringfügig kleiner als derjenige der Walzen ist.
  6. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die Beschichtung hergestellt wird mittels eines Verfahrens zur Abscheidung einer dünnen Schicht, wie z. B. eine chemische Abscheidung, eine Abscheidung aus der Dampfphase oder durch ein Plasma.
  7. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Schicht diskontinuierlich ist und aus einer Vielzahl von im Abstand voneinander angeordneter Erhöhungen (51) besteht.
  8. Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, daß jede Erhöhung (51) aus dem Ende eines Stabes (52) besteht, welcher in einer Bohrung (53) in der seitlichen Wand gleitend angeordnet ist, senkrecht zu deren Oberfläche (39) und in der Höhe einstellbar.
  9. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Schicht aus dem festen Material einen selbstschmierenden Kunststoff aufweist.
  10. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Schicht aus einem zusammengesetzten selbstschmierenden Material besteht.
  11. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Dicke der Schicht zwischen 0,01 und 0,1 mm liegt.
  12. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Schicht auf den Stirnwänden (6, 7) der Walzen befestigt oder abgeschieden ist.
EP93470022A 1992-09-14 1993-09-10 Vorrichtung zum Stranggiessen von dünnen metallischen Produkten zwischen Zylindern Expired - Lifetime EP0588743B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9211069A FR2695580B1 (fr) 1992-09-14 1992-09-14 Dispositif de coulée continue entre cylindres de produits métalliques minces.
FR9211069 1992-09-14

Publications (2)

Publication Number Publication Date
EP0588743A1 EP0588743A1 (de) 1994-03-23
EP0588743B1 true EP0588743B1 (de) 1996-11-06

Family

ID=9433590

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93470022A Expired - Lifetime EP0588743B1 (de) 1992-09-14 1993-09-10 Vorrichtung zum Stranggiessen von dünnen metallischen Produkten zwischen Zylindern

Country Status (7)

Country Link
EP (1) EP0588743B1 (de)
AT (1) ATE144929T1 (de)
DE (2) DE69305822T2 (de)
DK (1) DK0588743T3 (de)
ES (1) ES2096260T3 (de)
FR (1) FR2695580B1 (de)
GR (1) GR3022405T3 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10046384B2 (en) 2015-09-30 2018-08-14 Nucor Corporation Side dam with pocket

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2727337B1 (fr) * 1994-11-30 1996-12-27 Usinor Sacilor Dispositif de support d'une face laterale d'une installation de coulee continue de bandes metalliques entre cylindres
GB9505206D0 (en) * 1995-03-15 1995-05-03 Thor Ceramics Ltd Refractory systems
AUPN743296A0 (en) * 1996-01-05 1996-02-01 Bhp Steel (Jla) Pty Limited Twin roll continuous caster
CN1072053C (zh) * 1997-02-17 2001-10-03 新日本制铁株式会社 双滚筒式薄板连续铸造设备及其连续铸造方法
DE10055410A1 (de) * 2000-11-09 2002-05-23 Sms Demag Ag Vorrichtung und Verfahren zum Stranggießen eines Metallbandes im Gießspalt zwischen einem Paar umlaufend bewegbaren, eine Kokille ausbildbaren Rollen

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6133736A (ja) * 1984-07-25 1986-02-17 Nippon Steel Corp 双ロ−ル型鋳造圧延機における短辺堰のバツクアツプ装置
JPS6326243A (ja) * 1986-07-17 1988-02-03 Nippon Yakin Kogyo Co Ltd 金属薄板帯の直接鋳造装置
JPS6326242A (ja) * 1986-07-17 1988-02-03 Nippon Yakin Kogyo Co Ltd 金属薄板帯の直接鋳造装置
JPS63248547A (ja) * 1987-04-01 1988-10-14 Kawasaki Steel Corp 急冷金属薄帯の製造方法
JPS63303658A (ja) * 1987-06-05 1988-12-12 Kawasaki Steel Corp 紋り込み式連続鋳造方法およびその装置
JPH01317657A (ja) * 1988-06-15 1989-12-22 Kawasaki Steel Corp 急冷金属薄帯の製造装置
FR2655577B1 (fr) * 1989-12-07 1992-01-24 Siderurgie Fse Inst Rech Installation de coulee continue de produits metalliques minces entre deux cylindres.
JP2930384B2 (ja) * 1990-07-21 1999-08-03 新日本製鐵株式会社 薄板連続鋳造機のサイド堰潤滑方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10046384B2 (en) 2015-09-30 2018-08-14 Nucor Corporation Side dam with pocket

Also Published As

Publication number Publication date
ATE144929T1 (de) 1996-11-15
DK0588743T3 (da) 1997-04-14
ES2096260T3 (es) 1997-03-01
DE69305822T2 (de) 1997-05-28
GR3022405T3 (en) 1997-04-30
FR2695580B1 (fr) 1994-10-21
DE69305822D1 (de) 1996-12-12
EP0588743A1 (de) 1994-03-23
DE4331055A1 (de) 1994-03-17
FR2695580A1 (fr) 1994-03-18

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