EP0545770A1 - Procédé et dispositif de coulée continue d'une bande mince métallique entre cylindres - Google Patents

Procédé et dispositif de coulée continue d'une bande mince métallique entre cylindres Download PDF

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Publication number
EP0545770A1
EP0545770A1 EP92403144A EP92403144A EP0545770A1 EP 0545770 A1 EP0545770 A1 EP 0545770A1 EP 92403144 A EP92403144 A EP 92403144A EP 92403144 A EP92403144 A EP 92403144A EP 0545770 A1 EP0545770 A1 EP 0545770A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
metal
cylinders
counterweight
strip
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.)
Withdrawn
Application number
EP92403144A
Other languages
German (de)
English (en)
French (fr)
Inventor
Jacques Barbe
Alain Challaye
Jean-Michel Damasse
Paul Victor Riboud
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 EP0545770A1 publication Critical patent/EP0545770A1/fr
Withdrawn legal-status Critical Current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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
    • 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
    • B22D11/064—Accessories therefor for supplying molten metal

Definitions

  • the invention relates to an improved method and device for continuously casting a metal strip between two cylinders.
  • the liquid metal is poured into a casting space defined by the portions of the cylindrical walls of the cylinders situated above a plane passing through the parallel axes of these cylinders and by end walls called small faces or side walls, generally fixed, substantially perpendicular to the axes of the cylinders.
  • the liquid metal gradually solidifies on contact with the cooled cylindrical walls of the cylinders, forming solidified skins which are driven by the rotating cylinders and meet at the neck, that is to say the part the space between the cylinders of minimum width which is located at the plane passing through the axes of the cylinders.
  • the finished product is continuously extracted down below the cylinders.
  • the installations for casting between cylinders also include a sort of fixed riser called a counterweight constituted by two substantially vertical longitudinal walls in sealed contact with the cylinders and two front walls extending upwards the small faces or forming an integral part of them. this.
  • the flyweight into which the liquid metal is poured via a nozzle has in particular the function of delimiting, via the lower edge internal of its longitudinal walls, the surface of the cylinders on which the solidification of the cast metal takes place, and thus ensuring the regularity of this solidification whatever the level of the metal in the counterweight.
  • the meniscus of the liquid metal is not in contact with the walls of the cylinders and the risk of entrainment of floating impurities on the meniscus is thus considerably reduced.
  • the known methods and devices do not make it possible in all cases to obtain sufficient malleability of the metal during its cooling and solidification, to avoid the appearance of excessive stresses in the transverse directions of the strip, due to the retentions of solidification which can be the cause of the formation of cracks in the heart of the strip or on its surface.
  • the object of the invention is therefore to propose a process for the continuous casting of a metal strip between two counter-rotating cylinders with horizontal and parallel axes arranged opposite, delimiting with two side walls called small faces, a casting space having a minimum width corresponding to the thickness of the strip and the spacing between the rolls, in a part close to the plane containing the axes of the cylinders, constituting the neck of the casting space, the process consisting in introducing liquid metal into a counterweight open at its upper part and communicating at its lower part with the casting space and at forming the metal strip by entrainment and cooling of the metal filling the casting space which constitutes solidified skins in contact with the side walls of the rotating cylinders, this process making it possible to avoid the formation of cracks in the metal being solidified after casting and to favor the forming of the strip during cooling.
  • the cooling of the metal is regulated by the cylinders, in at least one zone, in the axial direction of the cylinders, so that at the level of the neck of the casting space, the metal strip comprises two external solidified skins and, between the external skins, at least one pocket of metal not yet solidified in a liquid or pasty state communicating, via at least one continuous channel filled with liquid or pasty metal delimited by the external skins, with the metal liquid from the flyweight.
  • the invention also relates to a device for continuous casting of a metal strip comprising two counter-rotating cylinders with horizontal and parallel axes arranged opposite and with a spacing corresponding to the thickness of the strip to be cast, two walls lateral or small faces delimiting a casting space between the cylinders and a molten metal casting shoe comprising two longitudinal walls of axial direction relative to the cylinders, substantially vertical, the internal lower edge of which is in contact with or in the immediate vicinity of the surface of a cylinder defines a line for bringing the liquid metal into contact with the cylinder, in which the inner lower edge of the longitudinal walls of the counterweight have a non-rectilinear shape, so as to define a line for contacting the liquid metal and the non-rectilinear cylinders which deviates in at least one region, along its axial length, from a generatrix of the cylinder , so as to vary, depending on the axial length of the cylinder, the length of the arc of contact of the cast metal with the cylinder and the malleability
  • Figure 1 is a schematic view in longitudinal section of a continuous casting device between cylinders according to the prior art.
  • FIG. 2 is a schematic cross-sectional view of the device shown in FIG. 1.
  • Figure 3 is a longitudinal sectional view of a continuous casting device between cylinders, according to the invention and according to a first embodiment.
  • FIG. 4 is a half-view in cross section of the device shown in FIG. 3.
  • FIG. 5 is a sectional view along 5-5 of FIG. 3 showing the cross section of the metal strip being solidified between the cylinders of a casting device as shown in FIGS. 3 and 4.
  • Figure 6 is a longitudinal sectional view of a continuous casting device between cylinders according to the invention and according to a second embodiment.
  • FIG. 7 is a sectional view along 7-7 of FIG. 6 showing the cross section of the strip being cooled between the rolls of the continuous casting device shown in FIG. 6.
  • Figure 8 is a half view in longitudinal section of a continuous casting device according to the invention and according to a third alternative embodiment.
  • FIG. 9 is a half-view in cross section along 9-9 of FIG. 8.
  • FIG. 10 is a cross-sectional view along 10-10 of FIG. 8 showing the cross section of the strip being solidified in the continuous casting device shown in FIG. 8.
  • Figure 11 is a cross-sectional view showing the shape of the inner surface of a longitudinal wall of a counterweight of a continuous casting device according to the invention.
  • the device shown in Figures 1 and 2 comprises two cylinders 1a and 1b whose axes are horizontal and parallel and which are arranged so as to have a spacing between their lateral surfaces, at the horizontal plane 2 containing their axes, substantially equal to the width of the metal strip 3 from which the casting is carried out.
  • the cylinders 1a and 1b are rotated in different directions during casting.
  • the pouring space delimited by a part of the lateral surface of the cylinders 1a and 1b situated above the plane 2 is closed on each of its sides by a wall lateral 4 called small face which comes into friction and tight contact with end parts of the cylinders 1a and 1b.
  • the casting device shown in FIGS. 1 and 2 further comprises a counterweight 6 inside which the liquid metal intended to constitute the metal strip 3 is poured out via a nozzle 7, the lower part of which penetrates to inside the counterweight 6.
  • the flyweight 6 comprises two longitudinal walls 8a and 8b substantially vertical and parallel to the axis of the cylinders 1a and 1b; these walls come into contact with the cylinders 1a and 1b in a zone delimited towards the inside of the counterweight by a straight line constituting a generator of the corresponding cylinder 1a or 1b.
  • the counterweight also comprises two front walls 9a and 9b which come into tight contact with the small faces 4 of the casting device or which constitute an upward extension of these small faces.
  • the conditions for pouring the liquid metal through the open upper part of the counterweight are such that the upper level 11 of this liquid metal inside the counterweight 6 is located substantially above the horizontal plane 12 containing the straight lines such that 14 delimiting upwards the cooling zone of the liquid metal.
  • the liquid metal comes into contact with the cylinders 1a and 1b which are cooled, so as to solidify gradually to form two skins of solid metal 3a and 3b whose thickness increases in the direction of rotation of the cylinders.
  • the cooling and solidification of the metal strip 3 is therefore substantially identical along the length of the cylinders, that is to say along the width of the strip 3.
  • This phenomenon is particularly accentuated and annoying, in the case of strips of large widths.
  • the continuous casting device comprises two cylinders such as the cylinder 15 with horizontal and parallel axes, the arrangement of which is identical to the arrangement of the cylinders 1a and 1b of the device shown in FIGS. 1 and 2.
  • the casting space between the two cylinders is delimited laterally by walls 16a and 16b or small faces which are in sealed contact with the end parts of the cylinders.
  • the device further comprises a counterweight 17 comprising in particular two longitudinal walls such as 18, the longitudinal end portions of which join to form the front end faces of the counterweight 17 in sealed contact with the small faces 16a and 16b.
  • each of the longitudinal walls 18 constituting the line of contact of the longitudinal wall with the corresponding cylinder 15 is of non-rectilinear shape and deviates in certain areas at least from one generatrix of the cylinder 15.
  • the inner lower edge of the longitudinal walls of the counterweight 17 comes into contact with the cylinder 15, substantially along a generatrix 21 of the cylinder, in its central part and s' deviates substantially and gradually from the generator 21 in the end zones of the longitudinal wall corresponding to the end zones of the cylinder 25 and of the strip 19.
  • the central part 22 of the strip 19 is obtained by cooling the liquid metal from the casting line 21 of substantially rectilinear shape.
  • the end portions 23a and 23b of the strip 19 which are obtained by solidification of the liquid metal from the end zones of the pouring line 20 inclined in the direction of the neck undergo less intense and less rapid cooling than the central zone of the strip and which gradually diminishes in the direction of the lateral ends of the cylinders and of the strip 19.
  • the vertical distance d between the end portions of the casting line 20 and the axial plane of the cylinders corresponding to the neck of the casting space has a short length corresponding to the length l ' of cooling the ends of the strip 19 which is appreciably less than the length l of cooling of the central part 22 of the strip, so that there remains inside the strip 19, in its end parts 23a and 23b, areas of non-solidified metal 24a and 24b in the liquid or pasty state which widens towards the lateral ends of the strip 19.
  • these non-solidified zones are in communication with the liquid metal contained in the feeder during casting, by means of continuous channels filled with non-solidified metal.
  • the solidified outer skins of the metal strip provide at least one pocket between them at the neck, in which the metal is not yet solidified and, in line with the pocket, a continuous channel up to the counterweight, the walls of the channel formed by the solidified skins which do not completely meet to close the channel at no point between the neck and the flyweight.
  • the strip 19 is solidified and constitutes a solid skin. closing the zones 24a and 24b along the lateral edges of the strip 19.
  • the internal surface 18a of the longitudinal wall 18 of the counterweight 17, as can be seen in FIG. 4, presents an outward inclination of the counterweight, or draft, in the direction from the top to the bottom of the wall 18.
  • the internal lower edge of the wall 18 constituting the casting line 20 in contact with the cylinder 15 is set back towards the outside with respect to the internal surface 18a whose clearance angle increases in the vicinity of its lower part. 18b.
  • the liquid metal is poured into the casting space by means of a nozzle 25 having lateral openings 26 ensuring the distribution of the liquid metal in the upper part of the weight delimiting a distribution volume of the liquid metal.
  • the opening of the counterweight and the inclination of its walls are such that there remains a small free space between the outlet openings of the nozzle and the inner surface of the upper part of the counterweight.
  • the excess heat from the cast metal can be dissipated in the upper part of the counterweight.
  • the casting device as shown in Figures 3 and 4 therefore allows not only to obtain a more malleable metal on the side edges of the strip during its solidification but also to improve the general conditions in which the casting takes place.
  • FIG 6 there is shown a second alternative embodiment of a casting device according to the invention which comprises the main elements which have already been described, namely two counter-rotating cylinders such as cylinder 30, arranged with their horizontal axes. and parallel, two small faces 31a, 31b in tight contact with the end of the cylinders 30 and closing the casting space on the two lateral sides corresponding to the edges of the metal strip 32 during casting and a counterweight 34 comprising two walls longitudinal such as 35 placed in the axial direction of the cylinders 30.
  • two counter-rotating cylinders such as cylinder 30, arranged with their horizontal axes. and parallel, two small faces 31a, 31b in tight contact with the end of the cylinders 30 and closing the casting space on the two lateral sides corresponding to the edges of the metal strip 32 during casting and a counterweight 34 comprising two walls longitudinal such as 35 placed in the axial direction of the cylinders 30.
  • the longitudinal walls 35 are inclined upwards towards the central part of the counterweight and have an internal lower edge 40 constituting the line of contact of the wall 35 and of the liquid metal with the cylinder 30, of non-rectilinear shape, so as to vary the length of the cooling zone of the liquid metal on the cylinder 30 along the axial length of this cylinder.
  • the contact line 40 has two end portions 41a, 41b inclined relative to the axial horizontal plane of the cylinder 30, so that the length of the cooling zone varies between a minimum low value l ' at the end of the cylinder and a maximum value l 1 at the inner end of zones 41a and 41b.
  • the contact line 40 comprises, following the parts 41a and 41b towards the central part of the cylinder, two parts 42a and 42b parallel to the axis of the cylinder at which the internal lower edge of the longitudinal wall 35 of the counterweight 34 is arranged along a generatrix of the cylinder.
  • the length 11 of cooling of the liquid metal is maximum.
  • the contact line 40 has a central part 43 parallel to the axis of the cylinder 30 and disposed along a generator at an intermediate level between the parts 42a and 42b and the outer end of the parts 41a.
  • the part 43 of the contact line 40 is connected by inclined parts 43a and 43b to the parts 42a and 42b respectively.
  • the length l ' of the cylinder cooling zone at the level of the central part 43 is intermediate between the maximum length l 1 corresponding to the parts 42a and 42b and the minimum length l 1 corresponding to the ends of the cylinder.
  • the strip 32 is shown being solidified between the cylinders, in the case of the use of the device shown in FIG. 6.
  • the areas 44a and 44b of the strip 32 located at the parts 42a and 42b of the cooling line are fully solidified because the cooling length is maximum in these areas.
  • the end parts 45a and 45b of the strip 32 and the central part 46 which are obtained respectively by cooling on the cylinder at the parts 41a, 41b and 43 of the contact line 40 have internal zones respectively 47a , 47b and 48 which are still in the liquid or pasty state, the width of these liquid or pasty zones 47a, 47b and 48 being variable in the zones where the contact line is inclined.
  • zones 47a and 47b have a maximum width towards the outside of the cylinders, this width gradually decreasing in the direction of the central part of the cylinder.
  • the central zone 48 has ends whose width progressively decreases at the level of the inclined parts 43a and 43b of the contact line 40.
  • the zones 47a, 47b and 48 are in communication with the liquid metal contained in the counterweight, by continuous channels delimited by the solidified outer skins of the metal strip.
  • the device shown in Figure 6 allows in particular to perform in very good conditions the casting of wide strips, since the pasty central part 48 of the strip provides a flexible volume absorbing deformations and stresses in the transverse directions of the strip (arrows 49) due to solidification retainers and ensuring displacement of metal in the longitudinal direction of the strip being formed.
  • pasty end zones 47a and 47b make it possible to improve the shaping of the edges of the strip under the effect of rolling by the cylinders 30.
  • Liquid metal is poured through a nozzle 50 having lateral openings 51 ensuring the distribution of the liquid metal in the upper part of the counterweight and the establishment of a higher level of the liquid metal.
  • the casting device conventionally comprises two cylinders such as 52 with horizontal and parallel axes, small faces such as 53 in sealed contact with the end of the cylinders and delimiting the casting space, and a counterweight 54 comprising walls longitudinal such as 55.
  • the walls such as 55 have, as previously, an inclination so that the upper part of the counterweight is tightened to improve the casting conditions.
  • the longitudinal walls 55 have an internal lower edge defining the pouring line 56 of the liquid metal of wavy shape.
  • the sinusoidal shape of the casting line 56 which runs on either side of a generator 57 of the cylinder makes it possible to obtain successive zones 58a, 58b, 58c, ..., in which the cooling length of the liquid metal on the surface of the cylinder varies alternately.
  • the cooling of the liquid metal is more important than in the intermediate zones such as the zone 58b, because the corresponding parts of the casting line are on either side of the generator. 57.
  • the solidified skin 59 of the strip 60 is thicker than in the intermediate areas such as 58b in which the cooling is less.
  • the general shape of the internal surface of the skin 59 is sinusoidal.
  • FIG 11 there is shown a cylinder 62 of a continuous casting machine between cylinders according to the invention and part of a longitudinal wall 63 of the weight of the casting device whose internal surface 64 has, in certain areas at least, a downward and outward inclination of the counterweight defining a draft, this draft shape having already been shown and briefly described above.
  • This pyramidal shape of the counterweight also makes it possible to optimize the conditions for pouring the liquid metal and the heat losses.
  • the continuous casting device according to the invention therefore makes it possible to optimize the conditions for casting and solidifying the metal of the strip, so as to limit the risks of cracking and to favor the shaping of the metal strip between the casting rolls.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP92403144A 1991-12-04 1992-11-23 Procédé et dispositif de coulée continue d'une bande mince métallique entre cylindres Withdrawn EP0545770A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9115026A FR2684576A1 (fr) 1991-12-04 1991-12-04 Dispositif de coulee continue d'une bande mince metallique entre cylindres.
FR9115026 1991-12-04

Publications (1)

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EP0545770A1 true EP0545770A1 (fr) 1993-06-09

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EP92403144A Withdrawn EP0545770A1 (fr) 1991-12-04 1992-11-23 Procédé et dispositif de coulée continue d'une bande mince métallique entre cylindres

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EP (1) EP0545770A1 (enrdf_load_stackoverflow)
DE (1) DE4240931A1 (enrdf_load_stackoverflow)
FR (1) FR2684576A1 (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2177858C1 (ru) * 2001-04-27 2002-01-10 Открытое акционерное общество Акционерная холдинговая компания "Всероссийский научно-исследовательский и проектно-конструкторский институт металлургического машиностроения имени академика Целикова" Устройство для непрерывного литья полосы
RU2220814C1 (ru) * 2003-02-19 2004-01-10 Открытое акционерное общество Московский опытный завод "Всероссийский научно-исследовательский и проектно-конструкторский институт металлургического машиностроения им. акад. Целикова" Устройство для непрерывного литья полосы

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0154250A2 (de) * 1984-03-01 1985-09-11 Concast Service Union Ag Verfahren und Vorrichtung zum kontinuierlichen Giessen von Metallen zwischen zwei gekühlten achsparellelen Trommeln
GB2198976A (en) * 1986-12-19 1988-06-29 Davy Mckeen Twin roll metal casting apparatus
WO1989002799A1 (en) * 1987-09-28 1989-04-06 Battelle Development Corporation Direct cast strip thickness control
EP0407323A1 (fr) * 1989-07-04 1991-01-09 Usinor Sacilor Procédé et dispositif de coulée continue entre cylindres de produits métalliques minces aptes au laminage à froid direct

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61249649A (ja) * 1985-04-26 1986-11-06 Sumitomo Metal Ind Ltd 薄鋳片の連続鋳造装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0154250A2 (de) * 1984-03-01 1985-09-11 Concast Service Union Ag Verfahren und Vorrichtung zum kontinuierlichen Giessen von Metallen zwischen zwei gekühlten achsparellelen Trommeln
GB2198976A (en) * 1986-12-19 1988-06-29 Davy Mckeen Twin roll metal casting apparatus
WO1989002799A1 (en) * 1987-09-28 1989-04-06 Battelle Development Corporation Direct cast strip thickness control
EP0407323A1 (fr) * 1989-07-04 1991-01-09 Usinor Sacilor Procédé et dispositif de coulée continue entre cylindres de produits métalliques minces aptes au laminage à froid direct

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 11, no. 102 (M-576)(2549) 31 Mars 1987 & JP-A-61 249 649 ( SUMITOMO METAL IND LTD ) 6 Novembre 1986 *

Also Published As

Publication number Publication date
DE4240931A1 (enrdf_load_stackoverflow) 1993-07-22
FR2684576A1 (fr) 1993-06-11

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