US20130008624A1 - Stirring-roller for a continuous slab-casting machine - Google Patents

Stirring-roller for a continuous slab-casting machine Download PDF

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Publication number
US20130008624A1
US20130008624A1 US13/636,892 US201113636892A US2013008624A1 US 20130008624 A1 US20130008624 A1 US 20130008624A1 US 201113636892 A US201113636892 A US 201113636892A US 2013008624 A1 US2013008624 A1 US 2013008624A1
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Prior art keywords
stirring
rolls
split
slab
roll
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Abandoned
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US13/636,892
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English (en)
Inventor
Siebo Kunstreich
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Rotelec SA
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Rotelec SA
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Assigned to ROTELEC reassignment ROTELEC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KUNSTREICH, SIEBO
Publication of US20130008624A1 publication Critical patent/US20130008624A1/en
Abandoned 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • 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
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/114—Treating the molten metal by using agitating or vibrating means
    • B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/122—Accessories for subsequent treating or working cast stock in situ using magnetic fields

Definitions

  • the invention applies to the area of continuous casting of flat metal products, such as slabs, particularly made of steel. More precisely, it relates to the controlled electromagnetic stirring of the molten metal still liquid in the solidification pool by inductors housed coaxially in supporting and guiding rolls of the secondary cooling zone of the continuous casting machine, made hollow for this purpose.
  • stirring rolls consists mainly of:
  • an element in axial rotation designed to come into rolling contact with the large surface of the product being cast, consisting of a tubular body (with a diameter which is in principle equal to, in any case close to the diameter of the usual supporting roll that it replaces), this tubular body being held at its ends by two spindles, of generally frustoconical shape, the small bases of which are housed in two end rolling bearings attached to the rigid structures of the frame of the casting machine;
  • an electromagnetic stirring equipment consisting of a polyphase linear inductor able to generate a magnetic field sliding along its axis and lodged in the free internal space of the tubular body, coaxially with the latter, means for immobilizing the inductor in axial rotation being advantageously provided, as proposed for example by FR No. 80/14487;
  • a cooling circuit by circulation of a cooling liquid, usually water, in order to secure the heat level of the tubular body in contact with the hot slab and of the electromagnetic stirring equipment.
  • a cooling liquid usually water
  • the inductor is of the three-phase or two-phase type with one or more pairs of magnetic poles per phase of the external electricity supply to which its connection means connect it, and that it therefore generates a movable magnetic field travelling along the axis of the roll, either in one direction or in the other, depending on the order of connection of these windings to the phases of the electrical supply.
  • the travelling speed of the field depends, for its part, on the pole pitch of the inductor (a parameter fixed by construction) and on the frequency of the electric current that supplies it and which, for its part, is the variable for the adjustment of this speed.
  • the application of the stirring rolls to a continuous casting machine of slabs consists schematically in subjecting the slab, in one or more zones of the machine situated downstream of the ingot mould, to one or more travelling magnetic fields, sliding horizontally along the width of the slab, each in a determined direction.
  • the still liquid portion of the molten metal situated in the heart of the slab being cooled is therefore driven in a direction that is identical to that of the sliding of the magnetic field acting on it.
  • the stirring rolls can be placed in groups, face-to-face on either side of the large faces of the slab at one and the same height level (see FIG. 1 , coming from the aforementioned No. 2185467), or superposed on one and the same side of the slab, or distributed on either side of the slab at different stages of the machine, etc.
  • stirring rolls do not allow it.
  • they are capable of making only circulation loops that occupy the whole width of the slab, therefore with vertical branches, which are only laterally localised, along and against the short faces.
  • the present invention proposes to achieve this by converting a conventional stirring roll into a double stirring roll or, in other words, into a “split stirring roll”.
  • split rolls As the mechanical rolls on a slab caster that are divided are commonly called “split rolls”, that's why, in this technical specification, they are called “split stirring rolls”.
  • the subject of the invention is a split stirring roll designed to be mounted on a machine for the continuous casting of flat products with a wide cross section, such as a steel slab, as a replacement of a usual supporting and guiding roll, the said split stirring roll comprising:
  • an element in axial rotation designed to come into rolling contact with the large surface of the cast slab, the said element consisting of at least one tubular body held at its ends by two spindles, of generally frustoconical shape, the small bases of which rest in two end rolling bearings;
  • a cooling circuit by circulation of a cooling liquid, usually water, in order to secure the heat level of the tubular body in contact with the hot slab and of the electromagnetic stirring equipment,
  • said electromagnetic stirring equipment consists of two polyphase linear inductors ( 40 , 50 ) placed end-to-end and aligned, electrically independent and each capable of generating a travelling magnetic field sliding independently one of the other.
  • the desired homogenization of the molten metal within the liquid pool in the slab can be obtained in the same way if the two inductors are adjusted to produce travelling magnetic fields sliding in opposite divergent directions, that is to say moving away from one another from the middle joining position of the inductors.
  • the main central circulation of the liquid metal will then flow down towards the point of junction of the two inductors on the upper side and upwards on the lower side (see FIG. 6 b )
  • the electromagnetic stirring equipment has a magnetic core (or yoke) common to the two inductors.
  • each inductor has its own magnetic core, distinct from and distant from that of the other inductor.
  • the split stirring roll with two inductors at a distance comprises an element of rolling contact with the surface of the slab on which it rests, consisting of two distinct aligned tubular bodies, and a third rolling bearing that separates them, preferably situated in the middle of the width of the slab, and delimiting, with the end bearings, two half stirring rolls, this intermediate bearing receiving the small abutted bases of two other spindles, of generally frustoconical shape similar to those of the spindles engaged in the end bearings and of which the large bases are attached to the ends facing the two tubular bodies.
  • this variant with an intermediate bearing is totally appropriate for satisfying a new nascent requirement in the field of the continuous casting of slabs, namely that of the casting of wide slabs, greater than 2 m wide, that can now exceed 50% and more of the conventional widths, which are of the order of 1.6 m.
  • the known stirring rolls conventionally have diameters of 300 mm and more.
  • rolls of smaller diameter (of the order of 240 mm) are increasingly used that can be easily used in conjunction with small-diameter supporting rolls which have the advantage of being able to be more numerous on one and the same machine height portion and, therefore, perform their function better.
  • machines for the continuous casting of steel slabs are designed for casting products the width of which is conventionally between approximately 0.9 and 1.6 m, and even sometimes up to 2.0 m.
  • the current trend is to hope to have machines that can cast products of greater width, for example of 2.4 m. This would involve having stirring rolls that are correlatively longer (let us say 2.5 m and more in order to give an idea).
  • half-roll includes both the case in which two aligned tubular bodies forming the stirring roll in its entirety have equal lengths and the case in which they would have unequal lengths for reasons indicated below.
  • Each half-roll has its own electricity supply terminals for supplying the inductor that it encloses, preferably all grouped at the end of the half-roll concerned facing the outside of the machine.
  • the circulation of the cooling fluid is common to the two half-rolls, and the means that provide the circulation of the fluid in each half-roll are connected to one another inside the central bearing.
  • split stirring roll chosen to qualify the stirring rolls according to the invention. This terminology applies both to the embodiment with two half-rolls and to that with a single tubular body.
  • the adjective “split” specifically relates to the qualifier “stirring” which precedes it in order to express the fact that the two internal inductors are electrically independent, without, for all that, necessarily being physically distant from one another. This technological option with separated inductors at a distance however remains, as has been said, designed and hence suited to the casting of extra-wide slabs, because of the presence of an additional intermediate rolling bearing that it underlies.
  • FIG. 1 is a schematic view illustrating the prior art represented by document FR No. 2185467 already cited to create a stirring of the liquid metal in the secondary cooling zone of the casting machine according to a configuration with a double loop, called “butterfly wings”;
  • FIG. 2 is a schematic view similar to the preceding figure, but illustrating the prior art represented by document EP-A-0 097 561 already cited also in order to install a stirring of liquid metal according to a configuration with three loops, called “triple zero”;
  • FIG. 3 is an overview, in a plane perpendicular to the large faces of the cast slab, of an embodiment of a split stirring roll according to the invention with three rolling bearings, one of which is intermediate, and two tubular bodies;
  • FIG. 4 is a view similar to FIG. 3 , but illustrating an embodiment of a split stirring roll according to the invention with a single tubular body and with no intermediate rolling bearing;
  • FIG. 5 illustrates a first stirring mode with central circulation of cast liquid metal that can be achieved with the split stirring roll according to the invention, the portion 5 a being a view in a plane perpendicular to the large faces of the cast slab, the corresponding portion 5 b being a view in the plane of the large faces;
  • FIG. 6 in its two portions 6 a and 6 b , is a figure similar to FIG. 5 illustrating a second stirring mode with central circulation of cast liquid metal that can be achieved with the split stirring roll according to the invention
  • FIG. 7 in its two portions 7 a and 7 b , is a figure similar to FIG. 6 illustrating another mode of stirring liquid metal, of the type rotating about the casting axis, that can also be achieved with the split stirring roll according to the invention.
  • FIGS. 1 and 2 have already been mentioned in the introduction of the present specification as representative of the prior art.
  • tubular splited stirring roll 1 is attached to a rigid support 2 incorporated into the frame of the machine for the continuous casting of continuous-cast slabs and enclosing the usual supporting and guide rolls.
  • the cast slab 3 progresses perpendicularly to the plane of the figure from the ingot mould (not shown) to the bottom of the casting machine, and the split stirring roll 1 covers the whole width while remaining in rolling contact with its surface via a generatrix of the element in axial rotation that forms it.
  • this element in rotation is formed by two cylindrical tubular bodies 6 and 12 at a distance from one another, therefore forming two stirring half-rolls 4 and 5 that are tubular, contiguous and aligned and of equal length in the example shown.
  • Three rolling bearings attached to the support 2 ensure the alignment and retention in axial rotation of these two half-rolls: two end bearings, the left bearing 9 and right bearing 15 , and an intermediate bearing 10 , in the central position here, facing the middle of the slab 3 .
  • Each half-roll 4 or 5 incorporate a polyphase linear inductor, mounted coaxially with it, capable of generating a magnetic field sliding longitudinally.
  • the left half-roll 4 contains the inductor 40 ; the right half-roll 5 contains the inductor 50 .
  • the cylindrical body 6 forming the left stirring half-roll 4 , is held at its ends by two spindles, of the same general frustoconical shape, a left spindle 7 and a right spindle 8 .
  • Each spindle is mounted at one end of said body via its large base 7 a , 8 a , the small base 7 b , 8 b being, for its part, engaged in an end rolling bearing, respectively left 9 and intermediate 10 , secured to the support 2 of the rigid frame of the casting machine.
  • these rolling bearings 9 and 10 allow the stirring roll 4 to rotate freely about its longitudinal axis B under the effect of the rolling contact of its tubular body 6 with the slab 3 progressing towards the lower portion of the continuous casting machine.
  • the inductor 40 with a travelling magnetic field centred in the tubular body 6 and taking up virtually the whole of the volume available inside the roll (except for an annular space 60 which separates it by a few mm, let us say 4 or 5 mm, from said body in order to allow the circulation of cooling water) is, for its part, prevented from rotating.
  • its left terminal extension 40 a and right terminal extension 40 b form supporting shafts which rest, one in a flange with keys 11 , placed on the outside of the left bearing 9 , therefore after having traversed this bearing via the inside of the small base 7 b of the spindle 7 , and, the other, after having likewise traversed the small base 8 b of the right spindle 8 , in the intermediate bearing 10 in order to fit onto the facing extension, coming from the right inductor 50 , via a male-female coupling (not shown) with splines and therefore removable simply by translation.
  • the right stirring half-roll 5 comprises a cylindrical body 12 engaged between two spindles, a left spindle 13 and right spindle 14 (similar to the spindles 7 and 8 ) via their respective large bases 13 a and 14 a .
  • the small base 14 b of the right spindle 14 is inserted into a right end rolling bearing 15 secured to the support 2
  • the small base 13 b of the left spindle 13 is inserted into the central intermediate rolling bearing 10 .
  • Each stirring half-roll 4 , 5 has its own electric circuit providing the electric power supply to its inductor.
  • the left stirring half-roll 4 therefore comprises, mounted on the end of the end bearing 9 , a panel 16 with two pairs of connecting terminals 16 ′ and 16 ′′, having two pairs of terminals in order to provide the connection to the electricity network for the two-phase windings of the inductor 40 .
  • the polyphase linear inductor used by the invention which may be of two- or three-phases type, may use different numbers of electrical terminals, namely four (as two pairs) or three with a common neutral for a two-phases type, and six (as three pairs), or four with a common neutral for a three-phases type, it being nevertheless emphasized that, in the case of an electrical star connection of the inductor, its number of terminals will be reduced
  • an inductor of this type can schematically be made up of an alternating series of windings 41 , 51 and of apparent circular magnetic poles 42 , 52 coming from the internal magnetic core of the inductor, which also serves as a winding support for the windings in the reception spaces between two contiguous magnetic poles. All that protrudes from this ordered assembly are the electric connecting wires, or cables, 41 a , 41 b ; 51 a , 51 b which exit and enter each series of windings that are interconnected in series-opposition (therefore connected to the same phase), and meet as close as possible the terminals of the connection panel.
  • the number of windings interconnected in series-opposition is four, that is having two pole pitches over the active length of the inductor.
  • the latter comprises a panel with electrical connection terminals at each of its ends, one receiving the wires of phase one, the other receiving the wires of phase two, or one receiving the input wires of the interconnected phase windings, the other receiving the output wires.
  • the right stirring half-roll 5 comprises, at the right end of the assembly, a connection panel 17 furnished with two pairs of terminals 17 ′ and 17 ′′, similar to the panel 16 which, dedicated to the left stirring half-roll 4 , is on the left side of the installation.
  • the split stirring roll 1 makes it possible to prevent deformations, particularly a bend, which would inevitably occur in the absence of the central bearing 10 .
  • the latter makes it possible to dispense with these deformations by providing each stirring roll forming the assembly with a relatively short length, comparable to or even less than that of the conventional stirring rolls used on machines for continuous casting of slabs of normal widths (up to 2 m and more frequently 1 600 mm).
  • This solution consisting in providing a cooling circuit common to the two stirring half-rolls 4 , 5 prevents having to place inlet and/or outlet water ducts in the central bearing 10 , in the same manner as it is not necessary to install therein electrical connection terminals, as already mentioned above.
  • the invention also recommends another embodiment of the split stirring roll, that is simpler than the previous one. Shown in FIG. 4 , it is characterized by a single tubular body 6 , as in the case of a conventional stirring roll, therefore without an intermediate rolling bearing.
  • This single tubular body encloses, mounted axially with it and a short distance away in order to arrange the annular separating space 60 , two polyphase linear inductors, a left inductor 45 and right inductor 55 , electrically separate from one another, but produced in a single piece, that is to say not at a distance because they have a single and common magnetic core (not shown) therefore without requiring a removable mechanical connection between them, nor any particular cooling circuit in this magnetic core.
  • the connecting wires of the windings of one to the electrical supply phases will all preferably be directed to an electrical connection panel present at an end of the roll and the connecting wires of the second inductor all directed to the other connection panel mounted at the other end.
  • the connecting wires 45 a , 45 b of the left inductor 45 are directed to the closest panel 16 mounted on the left rolling bearing 9
  • the connecting wires 55 a , 55 b of the right inductor 55 are directed to the closest panel 17 mounted on the right rolling bearing 15 .
  • split stirring rolls according to the invention both in their embodiment with intermediate bearing and without, can be incorporated without particular difficulties in a segment of the structure of the caster conventionally also supporting other usual rolls for supporting and guiding the slab.
  • the reader will have understood that the split stirring rolls with single tubular body, therefore without an intermediate bearing according to one embodiment of the invention, must be preferably reserved for the casting of slabs of conventional width, that is to say up to 1 600 mm just for giving idea. Beyond that, it would be preferable to opt for split stirring rolls with two tubular bodies and an intermediate bearing.
  • split stirring rolls consisting of two half-rolls, such as 4 and 5 , which are of 1150 mm length each, with an intermediate rolling bearing that is approximately 200 mm wide.
  • the diameter of the stirring rolls 4 , 5 can, for its part, be of the order of 230 mm.
  • the lengths of the two tubular bodies are unequal.
  • the absence of contact between the central bearing and the slab means that the portion of the slab passing opposite this bearing is not cooled and not supported. Therefore, providing split stirring rolls having contiguous stirring rolls of unequal length and having their intermediate bearing offset between two successive split stirring rolls will make it possible to ensure that it is not always the same portion of the width of the slab that is affected by this absence of cooling and support. This will, as required, improve the evenness of cooling of the slab and prevent local bulges.
  • FIGS. 5 , 6 and 7 some examples will be given illustrating the new possibilities offered to controlled electromagnetic stirring in the secondary cooling zone of a machine for the continuous casting of slabs by the split stirring rolls according to the invention when several of them are used in a coordinated manner.
  • pairs 70 a and 70 b will be, in the three examples currently being considered, used as pairs 70 a and 70 b , placed at the same level on the metallurgical height, facing one another, on either side of the large faces of the cast slab.
  • the two inductors facing one another on distinct rolls will be connected to one and the same polyphase electric power supply.
  • the inductors 71 and 73 are connected to the power supply 78 and the inductors 72 and 74 are connected to the power supply 79 .
  • the latter will preferably be identical to the power supply 78 , but nevertheless separate in order to be able to easily ensure the various desired adjustments concerning the direction of sliding of the magnetic fields, as will be seen.
  • the slab 3 is first formed in a continuous casting ingot mould 75 with the aid of an immersion nozzle 76 centred on the casting axis A and bringing the molten metal to the ingot mould via lateral outlet openings.
  • the slab leaves the ingot mould to join, below, the secondary cooling zone while progressing towards the bottom of the casting machine at a controlled speed so as to keep at a controlled level the height position of the liquid meniscus 77 within the ingot mould. It is in this secondary cooling zone of the casting machine that the retention and guide rolls are found, including the two split stirring rolls 70 a and 70 b of the invention.
  • the operator might also wish, permanently or temporarily, to impose a rotary stirring in a plane perpendicular to the casting axis A.
  • he will then simply have to modify the electrical connections so that, as shown in FIG. 7 a , the two magnetic fields slide in the same direction on the two inductors of one and the same roll and in the opposite direction between the two rolls.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Metal Rolling (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
US13/636,892 2010-03-23 2011-03-14 Stirring-roller for a continuous slab-casting machine Abandoned US20130008624A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR1001129A FR2957829B1 (fr) 2010-03-23 2010-03-23 Rouleau brasseur pour machine de coulee continu de brames
FR10/01129 2010-03-23
PCT/FR2011/000136 WO2011117479A1 (fr) 2010-03-23 2011-03-14 Rouleau brasseur pour machine de coulée continue de brames

Publications (1)

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US20130008624A1 true US20130008624A1 (en) 2013-01-10

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US13/636,892 Abandoned US20130008624A1 (en) 2010-03-23 2011-03-14 Stirring-roller for a continuous slab-casting machine

Country Status (10)

Country Link
US (1) US20130008624A1 (fr)
EP (1) EP2550121B1 (fr)
JP (1) JP5688449B2 (fr)
KR (1) KR101576201B1 (fr)
CN (1) CN201823912U (fr)
BR (1) BR112012023908A2 (fr)
CA (1) CA2791008A1 (fr)
FR (1) FR2957829B1 (fr)
RU (1) RU2012144813A (fr)
WO (1) WO2011117479A1 (fr)

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KR101449251B1 (ko) * 2013-03-07 2014-10-08 주식회사 포스코 전자기 교반 롤
WO2017117465A1 (fr) * 2015-12-29 2017-07-06 Extreme Caster Services, Inc. Rouleau amélioré pour environnements à haute température
EP3766600A1 (fr) 2019-07-17 2021-01-20 Primetals Technologies Austria GmbH Syst?me de bobine électromagnétique et rouleau d'agitation électromagnétique pour une installation de coulée continue
EP3766599A1 (fr) 2019-07-17 2021-01-20 Primetals Technologies Austria GmbH Syst?me de bobine électromagnétique et rouleau d'agitation électromagnétique pour une installation de coulée continue
EP3871803A1 (fr) 2019-07-17 2021-09-01 Primetals Technologies Austria GmbH Disposition des bobines électromagnétiques et rouleau électromagnétique pour une installation de casting continu

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KR101439632B1 (ko) * 2012-10-22 2014-09-11 주식회사 포스코 전자기 교반 롤
CN103894567B (zh) * 2014-03-26 2016-03-09 北京工业大学 一种提高急冷辊使用寿命的方法
WO2017125649A1 (fr) 2016-01-19 2017-07-27 Rotelec Procédé de brassage électromagnétique rotatif d'un métal en fusion au cours de la coulée d'un produit a large section et équipement pour sa mise en œuvre.
CN108856667B (zh) * 2018-06-25 2021-02-19 罗特勒克股份有限公司 在连续铸造期间承受板坯的方法
CN109622901A (zh) * 2019-01-07 2019-04-16 南京钢铁股份有限公司 一种超宽板坯中心缺陷控制方法
CN112548053B (zh) * 2020-11-23 2021-12-31 湖南中科电气股份有限公司 连铸板坯二冷区非对称分节辊式电磁搅拌装置

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KR101449251B1 (ko) * 2013-03-07 2014-10-08 주식회사 포스코 전자기 교반 롤
WO2017117465A1 (fr) * 2015-12-29 2017-07-06 Extreme Caster Services, Inc. Rouleau amélioré pour environnements à haute température
EP3766600A1 (fr) 2019-07-17 2021-01-20 Primetals Technologies Austria GmbH Syst?me de bobine électromagnétique et rouleau d'agitation électromagnétique pour une installation de coulée continue
EP3766599A1 (fr) 2019-07-17 2021-01-20 Primetals Technologies Austria GmbH Syst?me de bobine électromagnétique et rouleau d'agitation électromagnétique pour une installation de coulée continue
EP3871803A1 (fr) 2019-07-17 2021-09-01 Primetals Technologies Austria GmbH Disposition des bobines électromagnétiques et rouleau électromagnétique pour une installation de casting continu

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CN201823912U (zh) 2011-05-11
JP5688449B2 (ja) 2015-03-25
EP2550121A1 (fr) 2013-01-30
KR101576201B1 (ko) 2015-12-10
RU2012144813A (ru) 2014-04-27
WO2011117479A1 (fr) 2011-09-29
BR112012023908A2 (pt) 2016-08-02
FR2957829A1 (fr) 2011-09-30
CA2791008A1 (fr) 2011-09-29
KR20130028712A (ko) 2013-03-19
JP2013522053A (ja) 2013-06-13
EP2550121B1 (fr) 2016-03-09
FR2957829B1 (fr) 2012-11-09

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