Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
  • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
  • B22D11/0637—Accessories therefor
  • B22D11/0648—Casting surfaces
  • B22D11/0651—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
  • B22D11/10—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
• • 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

Definitions

• the present invention relates to electromagnetic magnetic field equipment sliding for the movement of molten liquid metal in a metal product of wide cross section, such as a steel slab, during its solidification, in downstream of the mold, in the secondary cooling zone of the continuous casting plant which produces it.
• the invention relates to the production of equipment of this type, usually called “Brew Roller” when it is integral with a support roll and guide the cast slab, made tubular for this purpose.
• the electromagnetic part of such equipment is conventionally constituted by a polyphase linear inductor generating a moving magnetic field oriented perpendicularly to the surface of the envelope of the roller which surrounds it and which slides along the axis of rotation of this roll.
• the second step is that of document FR 75/05623 published in August 1976, which lays down the basic technological design of the stirring roller with rotating inductor based on a shell and mechanical connecting members ensuring the support of the shell while leaving it free in axial rotation.
• These members are schematically constituted by an assembly formed, on each side of the ferrule, by a frustoconical tubular flare, mounted at the end of the shell, and by a rolling bearing mounted on a support element deported beyond the limits of the ferrule and fixed to the chassis of the casting machine, the small base of the rocket coming to journal in this bearing.
• the central inductor is, meanwhile, maintained and centered in an inner range of the large base of each rocket. At least one of the rockets (removable to allow mounting of the inductor in the ferrule) protrudes from its support bearing to allow the electrical connection of the inductor to an external polyphase supply.
• the third step is that of EP-A-0 043 315 published in January 1982.
• This document reveals in detail the successful operational realization of the roll brewer, fixed inductor this time, which is still current today: we find the same overall structure as the rotating inductor, except that the central inductor is held here by its own internal frame on which are wound the phase electric windings.
• This framework forms for this purpose an axial shaft whose terminal extensions, narrowed in diameter, pass through the small bases of the rockets of the ferrule to engage in rolling bearings supporting the ferrule and fixed to the frame of the machine by the intermediate a flange keying mounted on the outer face of these bearings and which blocks the inductor in axial rotation.
• This flange is also the bottom of a sealed water box with water inlets / outlets for cooling the ferrule and the inductor by circulating in the calibrated annular space separating the inductor of the ferrule.
• the water box also playing the role of electrical connection panel, externally comprises the electrical terminals that connect the inductor to the external power supply.
• such a known technology of a brewer roller is characterized in sum by the cooperation of two distinct coaxial subassemblies, one free in axial rotation. the other fixed, and both carried by the supports 4 of the ferrule 7 fixed to the chassis 5 of the casting machine:
• a second assembly movable in axial rotation thereof, formed by the ferrule 1 intended to come in rolling contact with the slab 6 and by its two tubular flares 2 which extends at each of its ends to be journalled by their small base 13 in bearings 3 remote bearings mounted on the support elements 4 fixed to the chassis 5 of the machine.
• water boxes 16, also serving as an electrical connection panel 18 of the inductor, externally cap the cradles 14 sealingly.
• This type of brewer which turns out to be perfectly adapted to its dual support-brewing function, is commonly used for most continuous slab casting machines of standard width, ie up to 1600 -1700 mm, width at which the ferrule supported by two end bearings is still rigid enough not to take a crippling arrow.
• This type of stirring roll could also be used for very wide slabs, ie greater than 2400 mm, by means of the introduction of two half rollers with intermediate rolling bearing, to ensure such a set its rigidity and stability. geometric straightness under the thermomechanical constraints imposed by the presence at its contact of a very broad slab during solidification (WO201 1/1 17479). On the other hand, for slabs of interlayer width, say from 2000 mm to +/- 20% (from 1600 to 2400 mm, so to fix the ideas), this technology turns out to be inapplicable.
• the present invention aims to provide a technological design thereof free of end rockets to stiffen the shell, to to allow a more economical realization as well in cost of acquisition as of operation and, in addition, to be able to cover all the requirements in term of width of slabs, from 1600 mm (or less) to 2400 mm (and more).
• the subject of the invention is a stirring roll for a machine for continuous casting of large cross section metal products, such as a slab, comprising:
• an internal electromagnetic equipment consisting of at least one polyphase linear magnetic field inductor sliding, coaxially mounted with the ferrule so as to provide between them an annular space for the circulation of a cooling liquid, said equipment constituting a tree axial end provided with hollow end extensions which come into support blocked in axial rotation on said support elements, and
• stirring roll characterized in that the ferrule carries on said terminal extensions of the inductor via said mechanical connecting members constituted by bearings interposed between the ferrule and said end extensions (preferably at the ends of the ferrule).
• the idea underlying the invention is to make the inductor play the support function of the ferrule which rotates at a short distance around it.
• rolling bearings of the ferrule, or more generally its mechanical connecting members leaving it in free axial rotation are separated from their traditional support elements integral with the structure of the casting machine.
• the technological design according to the invention also opens up particularly attractive possibilities for a simplified embodiment of extra-long stirring rollers intended, as already pointed out, for large slab casting machines (over 1600 mm) whose trend is confirmed moreover. in addition to the global steel industry pushed by the requirements of ever increasing productivity of steel mills.
• brewer roll comprises in fact no longer one, but two distinct aligned ferrules. These two ferrules are preferably of the same length, and provided with two additional intermediate bearings which bear on a central intermediate extension of the axial framework of the inductor. This intermediate extension is itself supported by a complementary central support fixed to the chassis of the casting machine.
• Another advantage of the divided baffle roll is of operational order: in the case of very wide slabs, say beyond 2000 mm, it will be possible to assemble on the same axial inductor framework within the same brewer two inductors, electrically and magnetically independently of each other, while providing a central support fixed to the frame of the machine.
• the brewing roll according to the invention compared to known traditional brewing rollers, is expressed by the fact that the end bearing bearings and the rockets have been removed and replaced by simple supports of a non-rotating fixed shaft represented by the terminal extensions of the inductor and that the shell rotates around this fixed shaft bearing on the latter by means of bearings that hold it.
• FIG. 1 is a pedagogical representation, according to an axial sectional view, of a deliberately hybrid brewing roll to facilitate comparison with the prior art, in that its left end (in the figure) is made with the technology according to the invention, while its right end is shown in its usual known embodiment;
• FIG. 2 is an axial sectional view of a stirrer roll in its basic version with a single shell (thus without central support);
• FIG. 3 is an axial sectional view of an alternative embodiment with double ferrule and central support, called "split brewer roller"
• a conventional brewing roller is essentially formed by an elongated tubular body rotating about its main axis of symmetry A-A.
• This body is constituted by a shell, or ferrule, 1 nonmagnetic stainless steel and frustoconical flares 2 which maintain this ferrule at both ends, the small base 2a of each rocket being engaged in a rolling bearing 3 'integrated in a support 4 secured to the rigid frame 5 of the continuous casting machine.
• This casting machine makes it possible to cast metal slabs 6 which progress from a mold in the high position to the cutting tool at the bottom of the machine. At the same time, progressively solidification of the molten metal from the periphery of the cast product 6 under the effect of intense cooling of its surface, by contact with the inner walls of the mold, then by direct watering of water in the stages of the secondary cooling of the casting machine, where precisely there are the brewing rollers of the machines which are equipped with them. It is here that the cast slab is held and guided in its slow downward movement by rotating support rollers that come, by a generator constantly renewed during the rotation, contact pressed each of large faces of the slab, such as the large face 7 in the figure.
• the inductor 8 of the polyphase linear type, comprises a magnetic carcass 9 which serves as a winding support for the phase windings 10 which follow one another along the inductor so as to be able to generate a magnetic field, generally directed perpendicularly to the large faces slab 6, but mobile, namely sliding along the axis AA of the inductor when these coils 10 are properly connected to the terminals of an external polyphase supply (two-phase or three-phase) not shown.
• This inductor 8 is, too, a body of axial symmetry on its longitudinal axis which merges with that AA of the ferrule] in order to be well centered on the latter by providing between them an annular space 1 1 for the circulation of a cooling fluid which will ensure the thermal maintenance of the stirrer roll in operation.
• This axial centering is achieved by means of cylindrical end extensions 12 of the reduced diameter inductor so as to be able to engage with a simple functional play in the small base 2a of the rocket 2 and to exceed the limits thereof. beyond the bearing 3 by a bearing 13 which serves for keying to lock the inductor in axial rotation at an end plate 14 provided with the necessary keys.
• Each end extension 12 which is hollow (axial channel 24) and provided with radial ducts 15 in communication with the annular space 1 1, opens into a water box 16 mounted at the end end on the end plate 14 and provided with a tubing 17 for entering or leaving the cooling water (outlet in the figure).
• the water box 16 also serves as a connection terminal board 18 of the inductor 8 to an external polyphase electrical supply, the connection wires 19 of the inductor passing through the axial recess of its extension 12 to join the terminals 18.
• the stirring roll according to the invention (whose constituent elements identical to those of the known stirring roll just described are designated by identical references) is distinguished from the known conventional technology by the fact that the rolling bearing 3 'and the rocket at each end of the roll are removed. This singularity makes it possible to free up space at the terminal extension 20 of the inductor 8 which then rests in support, locked in rotation by a shim 31, in the cradle formed by this fixed support 4.
• this extension 20 is provided more massive, with a greater diameter than that of the similar extension 12 conventional brewer roller (right part of the figure), in order to strengthen if necessary its mechanical strength, since it will be on this point more solicited, as will be understood now.
• bearings 3 alone replace the end rockets of the shell 1 (which are eliminated) in their function of maintaining and rotating the latter and, on the other hand On the other hand, these bearings 3 come directly on the terminal extension 20 of the inductor, which thus serves as support for the shell 1.
• a bearing 3 will be fixed at each end of the ferrule.
• This attachment can be provided, in a manner known per se, by a bolted crown not shown in the figures so as not to overload them unnecessarily.
• annular cheek 32 mounted at the end of the ferrule to serve as a grease plate of the bearings 3 and which caps these bearings to protect them from dust and improve the tightness of the assembly.
• FIG. 3 illustrates the technological variant of the invention applied in the case where the stirring roll is no longer with a single ferrule extending over the entire width of the cast slab, but with two half-ferrules 1a and 1b.
• intermediate bearings 3c and 3d are held at their close ends by intermediate bearings 3c and 3d and are separated from each other a short distance (say between 10 and 20 cm) imposed by the presence between them. an intermediate extension 20c of the inductor.
• the intermediate bearings 3c and 3d relate to the intermediate extension 20c of the inductor, which for this purpose is free of electrical windings and door on a central support 21 fixed to the chassis 5 of the casting machine.
• such a brewing roll which will be described as "divided" for a reason that obviously follows from what has just been said, and actually formed by two half-rings marked la and lb, is an adequate response to the growing need, in the world of iron and steel in any case, to be able to continuously cast larger slabs, easily exceeding the limit of conventional brewing rollers of 1.6 / 1.7 m or 2.4 m wide and even more in the future probably close, because this divided roller is protected against a crippling arrow by the central support 21.
• the terminal extensions of the inductor 20a or 20b, located at the ends of the roll, are hollow in order to be able to open,
• a sealed water box 16a or 16b On one side, by their free end, in a sealed water box 16a or 16b, provided with a water inlet / outlet pipe 17a or 17b and whose terminal panel 18a or 18b forms one of walls (the front wall in the figure),
• the intermediate extension 20c is also hollow and provided with radial drilled lines 15c. 15d in order to form a central leaktight conduit for communication between the two annular spaces 11a and 11b.
• said annular space l ia formed between the half-ferrule la and the concentric inductor 8 to be able to ensure a circulation of water in the vicinity of the half-ferrule la and cool during and after its contact with the hot slab 6 and than to cool the left part of the inductor 8;
• said annular space 1 lb formed between the half-shell 1b and the inductor 8 to be able to ensure a circulation of water in the vicinity of the periphery of the half-shell 1b and to cool during and after its contact with the hot slab 6 as well as to cool the right part of the inductor 8;
• the intermediate extension 20c of the inductor implies, of course, that the electric windings 10 are spaced at this location, but the mechanical continuity between the left and right part of the inductor is provided by this extension which may be steel, or in the same material as the axial framework of the inductor.
• this divided stirring roll may comprise two distinct electromagnetic inductors and separated, one in each half shell: an inductor 8a in the left half shell and an inductor 8b in the right half shell 1b.
• an inductor 8a in the left half shell and an inductor 8b in the right half shell 1b are represented here, and according to a preferred embodiment of the invention, identical inductors 8a and 8b them and similar to the single inductor 8 of Figure 1 or 2.
• inductors can be rendered mechanically integral by the intermediate extension 20c or separable for example to facilitate assembly, but meeting at the central support 21. As shown in the figure, a simple interlocking type "male-female" to this regard will be sufficient to ensure the mechanical connection of the two inductors.
• Another aspect, which could be a disadvantage of this variant, is that the distance between the two half-rings would be correlatively greater and, with this distance, also the fraction of the width of the cast slab 6 left free of any support mechanically and uncooled in a "dead" zone at the intermediate bearings.
• unwanted induced effects on the slab could be mitigated by providing sets of half-rings of varying lengths on the same roll. This would be shifted in this way, according to already well-known principles, the "dead" zones over the width of the slab cast from one roll to another over the height of the casting machine, in order to tend to homogenize the overall disruption after a few meters of progression of the slab in the direction of the casting.
• the inductors 8a and 8b are linear type polyphase (three phase or more usually two-phase), each of them requires as many pairs of connection terminals than phases of its power supply: two pairs for a two-phase, three pairs for a three-phase (nevertheless being noted that in the case of an electrical installation of the inductor "without neutral output", its number of terminals will be three for one two-phase and three for three-phase).
• An inductor of this type produces a magnetic field whose force lines are generally oriented perpendicular to the longitudinal axis AA of the inductor and mobile, because it can be dragged along this axis in one direction or the other by simple phase reversal of the power supply. It is thus understood that if one has two power supplies, or what amounts to the same, a split power supply, one can adjust the sliding fields on the two inductors 8a and 8b of the same brewer roller independently one on the other, which opens particularly interesting perspectives as to the possibilities of moving the molten metal within the slab during casting.
• each inductor must have the complete set of windings to generate a sliding magnetic field (minimum four for two-phase inductor and six for three-phase inductor), while the single inductor leaves him, his set of coils between the left and right, which can for example increase the number of pairs of poles per phase.
• connections of the coils of an inductor to the phases of the power supply will all be directed, preferably, to the same electrical connection panel present at one end of the roller and the connections of the other inductor will be directed all to the other connection panel mounted at the other end of the roll (here the connections 18a to the nearest panel 19a and the connections 18b to the panel 19b), whereas with a single inductor, half of the connections can be grouped on the left and the other half on the right.
• the stirring rollers according to the invention in their embodiment without central support 21, can be integrated without particular difficulties to a segment of the structure of the casting machine carrying other usual rollers for supporting and guiding the slab.
• the undivided stirring rollers with a single ferrule, and therefore without a central support, in accordance with one embodiment of the invention should rather be reserved for the casting of slabs of conventional width, that is to say until about 650 mm to fix the ideas. Beyond this, preference will be given to brewing rolls divided into two half-shells and a central support, however it is emphasized that, for all that, there is no contraindication to use them also for the casting of slabs of usual width. .
• the bearings of the ferrule may be exposed to the heat of the slab during casting more than in the known technology of rocker rollers carrier staggered on either side of the ferrule. In a variant, it will therefore be possible to advantageously opt for bearings of hoop with thermal helical deformation.
• This type of mechanical bearings is commercially available. In this connection, it is reported here, for information purposes only, the bearings produced and marketed by the German firm "Deutschrik Joseph EICH KG Gmbh.
• rocket used to qualify the support elements mounted at the ends of the or two ferrules constituting a divided baffle roll, covers any transmission member capable of providing a connection a rigid seal between the ferrules and the rolling bearings which carry them in free axial rotation.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
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• 2012
  • 2012-03-27 WO PCT/EP2012/001330 patent/WO2013143557A1/fr active Application Filing
  • 2012-03-27 RU RU2014132904/02A patent/RU2600776C2/ru active
  • 2012-03-27 EP EP12719254.0A patent/EP2830794B1/fr active Active
  • 2012-03-27 BR BR112014019299-5A patent/BR112014019299B1/pt active IP Right Grant
  • 2012-03-27 KR KR1020147025033A patent/KR101728444B1/ko active IP Right Grant
  • 2012-03-27 US US14/379,918 patent/US20150290703A1/en not_active Abandoned
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