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EP0792706B1 - Cylindre de coulée d'une installation de coulée continue sur un ou entre deux cylindres - Google Patents

Cylindre de coulée d'une installation de coulée continue sur un ou entre deux cylindres Download PDF

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Publication number
EP0792706B1
EP0792706B1 EP97400273A EP97400273A EP0792706B1 EP 0792706 B1 EP0792706 B1 EP 0792706B1 EP 97400273 A EP97400273 A EP 97400273A EP 97400273 A EP97400273 A EP 97400273A EP 0792706 B1 EP0792706 B1 EP 0792706B1
Authority
EP
European Patent Office
Prior art keywords
shell
hub
ferrule
flanges
roll
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
EP97400273A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0792706A1 (fr
Inventor
Pierre Delassus
François Mazodier
Jean-Marie Pelletier
Gérard Raisson
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 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 SA filed Critical Thyssen Stahl AG
Publication of EP0792706A1 publication Critical patent/EP0792706A1/fr
Application granted granted Critical
Publication of EP0792706B1 publication Critical patent/EP0792706B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F5/00—Elements specially adapted for movement
    • F28F5/02—Rotary drums or rollers
    • 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
    • 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
    • B22D11/0651—Casting wheels

Definitions

  • the invention relates to the constitution of a cylinder of a continuous casting installation on one or between two cylinders.
  • the cylinders used for the implementation of these casting techniques are usually cooled internally and have a hub and a ferrule arranged coaxially, axial connection means and rotation of the ferrule on the hub and means of support and centering of the ferrule on the hub.
  • Such cylinders are described for example in the document FR-A- 2 711 561.
  • This document describes a cylinder having a hub supporting a ferrule of good material heat conductor, for example an alloy of copper.
  • the ferrule has circulation channels of a coolant oriented parallel to the axis of the cylinder.
  • the axial positioning of the ferrule on the hub is provided by a shoulder of the hub, located at the level of the axially median plane of the cylinder, on which a corresponding shoulder, produced on the internal surface of the ferrule is held in abutment.
  • the centering of the ferrule is provided by flanges whose surface outer is tapered and cooperates with bores taper formed on the edges of the ferrule. Both flanges can slide axially on the hub, and it are called back to each other by callback means elastic.
  • the present invention aims to propose a new centering of the ferrule on the hub of a casting cylinder, particularly suitable when, unlike the aforementioned technique, the ferrule has a relatively large thickness at the edges.
  • a ferrule with thin edges, centered and supported only by the tapered ends implies that its axially middle part is significantly thicker than edges.
  • a thick ferrule can maintain an approximately constant thickness over its entire length; the shape of its section by a radial plane is globally continuous over its entire length, i.e. that it has only slight variations in thickness from one edge to the other, and therefore that the deformations inevitable that it undergoes during casting remain homogeneous over its entire width.
  • ferrules thick are materials that they can be made up, in their thickness, of several layers of different materials.
  • the material of the outer layer, in contact with cast metal can be particularly suitable to ensure rapid solidification of the metal cast at its contact, and the material of the inner layer being more suitable for ensuring mechanical strength of the ferrule.
  • the invention therefore aims to ensure concentricity such a ferrule and the hub both hot and cold, and despite the inevitable deformations due to dilations, to obtain a quality metal strip, having perfect regularity of thickness and profile longitudinal. It also aims to facilitate the manufacture of the ferrule and to ensure better sealing of the coolant circuits at level of the interface between the flanges and the ferrule.
  • the object of the invention is a casting cylinder for a casting installation continues metals on one or between two such cylinders, this cylinder comprising a hub and a ferrule arranged coaxially, and two support and centering flanges radial of the ferrule on the hub, characterized in that each flange has a frustoconical part which cooperates with a corresponding frustoconical surface of the bore of the ferrule, said frustoconical surface being located in an area where variations in diameter inner shell due to expansion deformations are substantially zero.
  • the radial centering of the ferrule on the flanges is therefore ensured by these frustoconical bearing surfaces. Like these are located in an area where variations in internal diameter of the ferrule, due to deformations of expansion, are substantially zero, the centering is therefore always provided by the same contact areas ferrule-flanges which remain more or less fixed in position, even when the shell is thermally deformed, and define ferrule position references which are the same cold and hot. And like centering flanges on the hub is also guaranteed, and not likely to be disturbed by deformations thermal since performed in an area of the cylinder where the temperature is substantially constant, it results that the concentricity of the shell relative to the shaft of the cylinder is permanently ensured, whatever variations in shell temperature.
  • the solid line represents the hot shell, deformed under the effect of thermal expansion.
  • a first effect of the heating of the shell is a radial expansion, leading to an increase in the diameter of the shell, illustrated by arrow F 1. If the temperature of the shell, when hot, was homogeneous, this radial expansion would be practically the only observable effect, with a purely axial expansion. But in practice, during casting, the outer surface layer of the shell heats up much more strongly, in contact with the cast metal, than the interior of the shell which remains at low temperature due to the intense cooling i internal to which it is subjected. This results in differential expansion which causes an elongation, in the axial direction, of the outer layer of the shell, greater than that of the inner layer.
  • This differential expansion therefore causes a bending deformation of the ferrule, illustrated by the arrow F 2 in Figure 3, which tends to bring the edge of the ferrule towards the axis of the cylinder.
  • this deformation is lower the thicker the shell under the cooling channels, since this thick and cold part prevents the deformation of the zone located above the channels.
  • this deformation leads to the internal diameter of the ferrule on its edges becoming less than its cold diameter, the generatrix of the internal surface of the ferrule thus deformed cutting the line of this cold generatrix at a point AT.
  • the distance between these diameter zones substantially constant performed on either side of the ferrule (in the axial direction), may vary slightly between the cold and hot states of the shell, due to the overall expansion of the shell in the axial direction. This is why, preferably, the flanges are slidably mounted on the hub, and the cylinder has elastic means of approximation of the two flanges towards each other.
  • the cylinder has means of axial abutment of the ferrule on the hub, located in a substantially axially median plane of the cylinder, and pressure means for exerting an axial force on the so-called stop means, while leaving the ferrule the possibility of expanding radially, without modify its axial positioning defined by said stop.
  • the inner surface of the ferrule has at least one bore cylindrical adjacent and coaxial to each surface tapered, each flange has a part cylindrical placed in this bore, and channels coolant supply to the shell are made in the flange and in the shell at the level of said cylindrical part.
  • Said cylindrical bore can be produced between the frustoconical surface and the edge of the ferrule.
  • a radial clearance is foreseen, cold, between the bore cylindrical and the corresponding cylindrical part of flanges, to allow the diameter to be reduced to hot, previously explained, from the edges of the shell, deformable seals ensuring sealing between the flanges and ferrule channels.
  • the said bore can also be made towards the middle of the cylinder, i.e. opposite, relative to the frustoconical surface, of the previous provision.
  • such cylindrical bores and cylindrical parts corresponding flanges can be made of on either side of the conical bearing, the radial clearance, the outside of the conical part, being preserved.
  • this game allows on the one hand not to add constraints ferrule hoop and, on the other hand, allows a modification of the bulge by playing on the cooling or the heat exchange conditions between the steel in ingot mold and ferrules.
  • an advantage resulting of the situation of said channels at the level of bores cylindrical and cylindrical parts of the flanges is that the tightness between flanges and ferrule is more easily achievable, and more reliable, than if these channels passed, as provided for in document FR-A-2711561 already cited, at a conical surface.
  • the shell 3 consists of two layers 37, 38 coaxial in different materials, the outer layer 37 being made of a material which is a good conductor of the heat, such as copper or a copper alloy, and the inner layer 38 being made of one more material high mechanical resistance, for example steel stainless SUS 304. It has, near its external surface 31, cooling channels 32 connected at their ends to channels 7, 8 supply and return of cooling water.
  • the hub 2 has an additional middle part 21 larger diameter than its axial end portions 22, 23.
  • the middle part 21 of the hub 2 has a shoulder 24, located in a substantially median plane P of the cylinder, and orthogonal to its axis.
  • the ferrule 3 has, on the inside, a shoulder 33 corresponding, and therefore also located in plane P.
  • the centering, in the direction of the axis, of the ferrule 3 on the hub 2 is secured by pressing the shoulder 33 of the ferrule on the shoulder 24 of the hub, which precisely defines the positioning of the ferrule with respect to the hub and therefore with respect to the entire casting installation.
  • the symmetry of position of the shell relative to the median plane of the cylinder is thus ensured and preserved even when the shell expands axially during casting, the axial displacements of the edges of the shell, caused by this expansion, taking place symmetrically by in relation to said median plane.
  • Each flange has a part frustoconical 51, 61 which cooperates with the surface of a bore 34, 35 also of frustoconical shape similarly taper, made inside the shell 3, in a area where variations in the internal diameter of the ferrule, due to expansion deformations thereof, are substantially zero, as explained previously.
  • the flanges 5, 6 are pulled towards each other by elastic approximation means, acting according to the axial direction of the cylinder to support the parts frustoconical 51, 61 flanges against the bores frustoconical 34, 35 of the shell, so as to ensure its centering and its support. It should be noted that the radial centering of the ferrule on the hub is ensured only by the conical ferrule-flange bearings, this which allows to keep this centering even when the middle part of the shell deviates, when hot, from the hub, under the effect of thermal expansion, as indicated above.
  • the means of elastic approximation of the flanges to each other may consist of means of pulling the flanges towards the middle part 21 of the hub, acting independently on each flange.
  • these approximation means include means of elastic connection of the flanges to one another, constituted by a system of tie rods 71 distributed circumferentially, which connect the flanges in passing freely through bores drilled in the part center 21 of the hub.
  • These tie rods 71 pass through corresponding orifices of the flanges 5, 6 and bring to their ends of the adjustment nuts 73.
  • Elastic elements such as for example elastic washers 74, are placed between the nut 73 and the flange 6, so as to exert a tensile force flanges towards each other while allowing their spacing.
  • the tensile force is regulated by the nuts 73, so as to apply the flanges against the tapered bore of the ferrule with sufficient force to support the spacing force undergone by cylinders during casting without risking this effort does not cause, due to the taper of the spans, a separation of the flanges and a retraction of the shell towards the axis of the cylinder, and to prevent slipping in rotation, while allowing a slight sliding according to the axial direction, when, when hot, the distance between the tapered bores varies as a result of axial expansion and radial of the ferrule.
  • the centering of the flanges 5, 6 on the parts 22, 23 of the axial end of the hub 2 is provided by sliding resin injected into fitted areas 26 for this purpose between the flanges and the hub, or by other means such as bearings or oil seal to minimize the clearance between hub and flange, for example of the order of 0.05 mm on the diameter, while retaining good qualities of axial sliding of the flanges on the hub, to avoid seizures and subsequent disturbances in the flange movements.
  • connection system rotation of known type, not shown, for example keys or other rotating connection means ensuring the continuity of the passage of the couple while allowing freedom of translation in the direction axial.
  • Transmission of torque by the means indicated above is preferably supplemented by a friction drive at the shoulders of the hub 24 and ferrule 33.
  • the cylinder includes means for pressure to press the shoulder 33 of the ferrule on the shoulder 24 of the hub.
  • These means include a flange elastic 80 fixed on the hub 2 and resting on the ferrule via one or more spacers 81.
  • This spacer can be a continuous ring placed between the ferrule 3 and the central part 21 of the hub 2, or well be segmented and thus form a plurality of independent push pieces in the form of tiles placed in longitudinal grooves made at the interface between ferrule and hub, as indicated in the document FR-A-2711561 already cited.
  • This ring or these pushing parts are supported against a second shoulder 36 of the shell, arranged at near the shoulder 33 and opposite to it.
  • the taper angle of the tapered bearings is large enough to avoid any risk of jamming flanges in the shell.
  • the length conical surfaces in contact is weak so that the difference in internal diameter of the ferrule on the one hand and on the other side of each frustoconical surface 34, 35 is also small and therefore the thickness of the shell does not varies very little over its entire width.
  • the length of conical surfaces in contact is however sufficient to provide sufficient contact area to resist to the spacing forces of the cylinders generated by the cast metal.
  • the location, in the axial direction, of the frustoconical surfaces 34.35 is determined experimentally and / or by a calculation model which allows, in a manner known per se, to determine the deformed of the hot shell as a function of its geometry, the nature of the material or materials which make up, and parameters like the water flow in cooling channels, exchange coefficients thermal, etc. We can then determine the point or the profile area of the inner surface of the shell where radial expansions compensate for deformations of bending.
  • this point is calculated at 560 mm from the median plane of the cylinder.
  • each flange 56 comprises, on the side of the larger diameter of the part frustoconical 51, 61, a cylindrical part 52, 62 which is located in a cylindrical bore 39.40 made in the ferrule between the frustoconical surface 34, 35 and the edges of the said ferrule.
  • a radial clearance, of the order of 0.6 to 0.8 cold mm is provided between said parts cylindrical flanges and corresponding bores of the shell, to authorize the reduction, explained previously, the diameter of the edges of the hot shell.
  • Supply and return channels 7, 8 cooling water flows to the surface inside of the ferrule in said cylindrical bore, where they communicate with respective channels 53, 54 made in the flanges, which communicate themselves with main channels 27, 28 arranged in the hub. Seals 55 seal these channels at the interface between the cylindrical part of the flange and the corresponding cylindrical bore of the ferrule.
  • the cylindrical part 52 ′ of the flange 5 and the bore corresponding cylindrical 39 'of the ferrule, at the level from which the channels 7, 8, 53, 54 pass, are located the other side of the frusto-conical area, i.e. on the side with the smallest diameter thereof.
  • this also has a bore cylindrical in which a second part is housed cylindrical 55 of the flange, with minimal clearance allowing the deformation of the shell already explained, this game can however be in this variant more important.
  • the communication of the respective channels of the shell and of the flange at a cylindrical interface allows facilitate the corresponding machining and ensure better sealing at this interface.
  • the flanges 5, 6 are preferably made made of a material with an equal coefficient of expansion or close to that of the hub material, which guarantees the centering of the flanges on the hub, even when these parts undergo temperature variations which, even if they remain weak, are in practice inevitable.
  • the frustoconical part of the flange will be made, or will have a coating layer, in one low friction material, for facilitate its sliding against the frustoconical surface of the ferrule, during micro-displacements which, despite everything happen between these surfaces.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Continuous Casting (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Rollers For Roller Conveyors For Transfer (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Metal Rolling (AREA)
EP97400273A 1996-02-29 1997-02-07 Cylindre de coulée d'une installation de coulée continue sur un ou entre deux cylindres Expired - Lifetime EP0792706B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9602652 1996-02-29
FR9602652A FR2745510B1 (fr) 1996-02-29 1996-02-29 Cylindre de coulee d'une installation de coulee continue sur un ou entre deux cylindres

Publications (2)

Publication Number Publication Date
EP0792706A1 EP0792706A1 (fr) 1997-09-03
EP0792706B1 true EP0792706B1 (fr) 2000-01-19

Family

ID=9489793

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97400273A Expired - Lifetime EP0792706B1 (fr) 1996-02-29 1997-02-07 Cylindre de coulée d'une installation de coulée continue sur un ou entre deux cylindres

Country Status (25)

Country Link
US (1) US5839501A (es)
EP (1) EP0792706B1 (es)
JP (1) JP3975368B2 (es)
KR (1) KR100441636B1 (es)
CN (1) CN1064570C (es)
AT (1) ATE188896T1 (es)
AU (1) AU710620B2 (es)
BR (1) BR9701110A (es)
CA (1) CA2198566C (es)
CZ (1) CZ286932B6 (es)
DE (1) DE69701158T2 (es)
DK (1) DK0792706T3 (es)
ES (1) ES2142134T3 (es)
FR (1) FR2745510B1 (es)
GR (1) GR3033044T3 (es)
MX (1) MX9701464A (es)
PL (1) PL181510B1 (es)
PT (1) PT792706E (es)
RO (1) RO118797B1 (es)
RU (1) RU2175903C2 (es)
SK (1) SK282078B6 (es)
TR (1) TR199700119A2 (es)
TW (1) TW360567B (es)
UA (1) UA47411C2 (es)
ZA (1) ZA971615B (es)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH690903A5 (de) * 1999-08-20 2001-02-28 Main Man Inspiration Ag Bandgiessmaschine mit zwei Giessrollen.
AT408199B (de) * 1999-09-06 2001-09-25 Voest Alpine Ind Anlagen Giesswalze
ITTO20010933A1 (it) * 2001-10-02 2003-04-02 Skf Ind Spa Gruppo mozzo per la ruota di un veicolo e procedimento per la sua fabbricazione.
US6892793B2 (en) * 2003-01-08 2005-05-17 Alcoa Inc. Caster roll
US6971174B2 (en) * 2003-01-08 2005-12-06 Alcoa Inc. Method of manufacturing a caster roll
JP4686288B2 (ja) * 2005-07-25 2011-05-25 キャストリップ・リミテッド・ライアビリティ・カンパニー 鋳造用ロール
FR2919511B1 (fr) * 2007-07-30 2010-01-29 Snecma Propulsion Solide Rouleau composite thermostructural

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0005012B1 (en) * 1978-04-14 1983-01-26 Pilkington Brothers P.L.C. A roll for use under high or low temperature conditions
CH674166A5 (es) * 1986-12-22 1990-05-15 Lauener Eng Ag
FR2654372B1 (fr) * 1989-11-16 1992-01-17 Siderurgie Fse Inst Rech Cylindre pour un dispositif de coulee continue sur un ou entre deux cylindres.
DE4041957A1 (de) * 1990-12-24 1992-06-25 Thaelmann Schwermaschbau Veb Vorrichtung zum festspannen von walzringen
FR2672523B1 (fr) * 1991-02-13 1995-04-21 Usinor Sacilor Virole de cylindre de coulee continue.
FR2711561B1 (fr) * 1993-10-27 1996-03-29 Usinor Sacilor Cylindre de coulée d'une installation de coulée continue sur un ou entre deux cylindres.

Also Published As

Publication number Publication date
GR3033044T3 (en) 2000-08-31
CA2198566A1 (fr) 1997-08-29
ZA971615B (en) 1997-09-10
PL181510B1 (pl) 2001-08-31
CN1064570C (zh) 2001-04-18
AU710620B2 (en) 1999-09-23
TW360567B (en) 1999-06-11
RO118797B1 (ro) 2003-11-28
BR9701110A (pt) 1998-10-06
UA47411C2 (uk) 2002-07-15
PT792706E (pt) 2000-05-31
KR970061403A (ko) 1997-09-12
CZ58297A3 (en) 1997-09-17
MX9701464A (es) 1998-04-30
CA2198566C (fr) 2004-01-27
CN1168305A (zh) 1997-12-24
JPH09239499A (ja) 1997-09-16
FR2745510A1 (fr) 1997-09-05
RU2175903C2 (ru) 2001-11-20
SK282078B6 (sk) 2001-10-08
DE69701158T2 (de) 2000-09-14
US5839501A (en) 1998-11-24
EP0792706A1 (fr) 1997-09-03
PL318684A1 (en) 1997-09-01
JP3975368B2 (ja) 2007-09-12
SK25297A3 (en) 1998-04-08
CZ286932B6 (en) 2000-08-16
AU1501197A (en) 1997-09-04
FR2745510B1 (fr) 1998-05-22
ES2142134T3 (es) 2000-04-01
DE69701158D1 (de) 2000-02-24
TR199700119A2 (tr) 1997-09-21
DK0792706T3 (da) 2000-06-19
ATE188896T1 (de) 2000-02-15
KR100441636B1 (ko) 2004-10-02

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