EP0053060B1 - Induktor mit Wanderfeld und orientiertem Fluss für eine Umrührrolle beim Stranggiessen von Brammen - Google Patents

Induktor mit Wanderfeld und orientiertem Fluss für eine Umrührrolle beim Stranggiessen von Brammen Download PDF

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Publication number
EP0053060B1
EP0053060B1 EP81401776A EP81401776A EP0053060B1 EP 0053060 B1 EP0053060 B1 EP 0053060B1 EP 81401776 A EP81401776 A EP 81401776A EP 81401776 A EP81401776 A EP 81401776A EP 0053060 B1 EP0053060 B1 EP 0053060B1
Authority
EP
European Patent Office
Prior art keywords
inductor
shaft
magnetic
magnetic flux
arbor
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
Application number
EP81401776A
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English (en)
French (fr)
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EP0053060A1 (de
EP0053060B2 (de
Inventor
Jean Delassus
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.)
Rotelec SA
Original Assignee
Compagnie Electro Mecanique 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
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Application filed by Compagnie Electro Mecanique SA filed Critical Compagnie Electro Mecanique SA
Priority to AT81401776T priority Critical patent/ATE6995T1/de
Publication of EP0053060A1 publication Critical patent/EP0053060A1/de
Publication of EP0053060B1 publication Critical patent/EP0053060B1/de
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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/34—Arrangements for circulation of melts
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/02—Stirring of melted material in melting furnaces

Definitions

  • the present invention relates to a device for setting in motion a molten metal in a continuous casting installation and during the cooling of the cast product. It relates more particularly to the casting of wide flat products, generally designated under the name of slabs.
  • the inductor includes a magnetic core in the form of a magnetic stainless steel shaft, which has deep longitudinal grooves extending over the entire length of the shaft and evenly spaced in the circumferential direction. In the grooves are embedded packets of flat magnetic sheets parallel to the axis of the shaft. The latter and the sheets are notched by a series of annular grooves spaced along the length of the shaft and housing circular induction coils.
  • the object of the present invention is to provide a sliding field inductor for a roll-brewer for continuous slab casting, making it possible to concentrate the magnetic flux towards the contact zone between the roll and the slab and to greatly reduce the magnetic leaks in the others. directions, in order to make the best use of the magnetic capacity of the inductor core.
  • the inductor according to the present invention comprising a grooved shaft which carries flat magnetic sheets and parallel to the axis of the shaft, the latter and the sheets being notched by a series of annular grooves spaced along the length of the shaft and housing circular field coils, is characterized in that the shaft is fixed, in a manner known per se, and is made of a non-magnetic metal which is a good conductor of electricity and has a longitudinal groove of large cross section accommodating a single packet of magnetic sheets which alone constitutes the magnetic core of the inductor, while the shaft constitutes a screen for the magnetic flux generated by the inductor coils, the assembly being such that this magnetic flux is oriented in a privileged fixed direction.
  • the inductor according to the invention is maintained in a fixed orientation relative to the continuous casting, inside the roller which is shown to rotate so as to guide and support the continuously cast product.
  • the inductor is mounted in a fixed orientation such that the lamination plane of the package of magnetic sheets forming the core is perpendicular to the surface of the continuously cast slab and that the free edge of the magnetic sheets is located opposite the area of contact between the roller and the slab.
  • Each inductor coil completely surrounds the inductor, passing in front of the magnetic core formed by the sheet pack and behind the non-magnetic metal shaft which is a good conductor of electricity.
  • the magnetic core is embedded in the groove of the non-magnetic, electrically conductive metal shaft, the three faces of the core which are not facing the contact area between the roller and the slab are protected against the losses of flux by the screen effect resulting from the currents induced in the non-magnetic metal tree which is a good conductor of electricity.
  • the result is that, in service, the magnetic flux is essentially directed towards the contact zone between the roller and the slab.
  • rollers 4 to 9 we can see part of a slab 1 during continuous casting, with its outer crust 2 of metal already solidified and its core 3 of metal still in fusion.
  • the slab 1 during casting is guided and supported by a number of rollers such as rollers 4 to 9.
  • some of the rollers are mounted to rotate freely, while others can be rotated.
  • certain rollers for example the rollers 6 and 7, are hollow and house an inductor 10 for stirring the core 3 of molten metal. These latter rollers are usually called “brewer rollers”.
  • Each brewer roller 6 or 7 comprises a hollow cylindrical casing 11, made of non-magnetic stainless steel, at the ends of which are fixed two ends of hollow shafts, respectively 12 and 13, by screws such as 14. Bearings (not shown) allow the rotation of the assembly 11, 12, 13 about its axis.
  • the inductor 10 Inside the cylindrical casing 11 is the inductor 10.
  • This comprises a magnetic core 15 constituted by a single pack of thin magnetic sheets suitably insulated from each other in a known manner by an insulator not shown.
  • the laminated magnetic core 15 is embedded in a wide and deep longitudinal groove 16 which is hollowed out in a solid shaft 17 made of non-magnetic metal and a good conductor of electricity, for example aluminum alloy or copper alloy.
  • the magnetic core 15 is held in place in the longitudinal groove 16 by several bolts 18 cooperating with keys 19 housed in transverse grooves with a dovetail section, hollowed out in the face of the magnetic core 15 which faces the bottom of the the longitudinal groove 16.
  • the free face 20 of the magnetic core 15 is flush with the cylindrical surface of the shaft 17 and is oriented towards the adjacent face of the slab 1.
  • the shaft 17 and the magnetic core 15 are notched by a series of large annular grooves 21 spaced along the length of the shaft 17 and housing inductor coils 22 to 26 of cylindrical shape.
  • the coils 22 to 26 are for example constituted by turns of insulated copper flat conductor and are suitably insulated with respect to the magnetic core 15 by insulators placed in the bottom of the annular grooves 21 and on the sides thereof.
  • the ends of the shaft 17 pass, with a certain radial clearance, respectively through the ends of hollow shafts 12 and 13 and are supported and rigidly fixed to a frame (not shown) so that the shaft 17 remains stationary when the assembly 11, 12, 13 rotates around its axis.
  • Two narrow longitudinal grooves 27 and 28 (Figure 1), extending over the entire length of the shaft 17 and slightly deeper than the annular grooves 21, and passages 29, 30, 31 and 32 ( Figure 2), formed in the two ends of the shaft 17, are provided to house the conductors 33 and 34 (FIG. 4) for supplying current to the coils 22 to 26.
  • the coils 22 to 26 are divided into two groups of coils, constituted respectively by the coils 22, 24 and 26 and by the coils 23 and 25.
  • the coils 22, 24 and 26 are wound in alternating directions , are electrically connected in series and are connected by conductors 33 to two external terminals 35 which are themselves connected to one of the two phases of a two-phase alternating current supply source (not shown).
  • the coils 23 and 25 are wound in opposite directions, are electrically connected in series and are connected by conductors 34 to two other external terminals 36 themselves connected to the second phase of the two-phase alternating current source.
  • the extreme coils 22 and 26 have approximately twice as few turns as the coil 24 and that the coils 23 and 25 each have approximately the same number of turns as the coil 24.
  • the magnetic flux generated by the inductor 10 when the current is maximum in the first phase and zero in the second phase has the shape shown in Figure 2, with a north pole between the coils 22 and 24 and a south pole between the coils 24 and 26. It can be noted in FIG. 2 that the flux is closed in the laminated magnetic core 15 where the flux lines are very tight, which can lead to magnetic saturation of the laminated core . It can also be seen that the presence of the shaft 17 made of non-magnetic metal and a good conductor of electricity constitutes a very effective screen which prevents the magnetic flux from exiting towards the rear face of the inductor 10, as a result of the currents induced in the shaft 17, which oppose the passage of the magnetic flux. As a result, the capacity of the magnetic core 15 until saturation will be devoted almost entirely to the passage of the useful magnetic flux.
  • the shaft 17 and the induced currents which arise therein also oppose magnetic flux leakage on the sides of the magnetic core 15.
  • the magnetic flux is mainly concentrated in a dihedral of angle a, which represents the useful mixing angle.
  • the inductor according to the present invention therefore makes it possible to make maximum use of the magnetic capacity of the laminated core 15 to produce a useful stirring flux. It makes it possible to obtain a useful stirring power 5 to 6 times greater than that obtained with the previously known inductors.

Landscapes

  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Continuous Casting (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
  • General Induction Heating (AREA)
  • Liquid Crystal Substances (AREA)
  • Memory System Of A Hierarchy Structure (AREA)
  • Glass Compositions (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Claims (3)

1. Gleitfeldinduktor für eine Bras-Rolle beim kontinuierlichen Gießen von Brammen, mit einer Welle (17), die in einer Rille ebene und zur Wellenachse parallele Magnetbleche enthält, wobei in die Welle und in die Bleche eine Serie von , ringförmigen Nuten (21) über die Länge der Welle verteilt eingeschnitten ist, in denen kreisförmige Induktionsspulen (22 bis 26) liegen, dadurch gekennzeichnet, daß die Welle (17) in an sich bekannter Weise drehfest ist, aus einem unmagnetischen elektrisch gut leitenden Metall besteht und eine Längsrille (16) großer Querschnittsfläche aufweist, in der ein einziges alleine den Magnetkern (15) des Induktors (10) bildendes Paket von Magnetblechen liegt, während die Welle (17) einen Schirm für den von den Spulen (22-26) erzeugten Magnetfluß bildet derart, daß dieser Magnetfluß in einer festen Vorzugsrichtung orientiert ist.
2. Induktor nach Anspruch 1, dadurch gekennzeichnet, daß enge Längsrinnen (27 und 28), die sich über die ganze Länge der Welle (17) erstrecken und etwas tiefer als die Ringnuten (21) sind, und an den beiden Enden der Welle (17) gebildete Durchlässe (29, 30, 31, 32) für die Leiter (33 und 34) vorgesehen sind, über die die Spulen (22 bis 26) mit Wechselstrom versorgt werden.
3. Induktor nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Spulen (22 bis 26) so angeschlossen sind, daß ein zweiphasiger bipolarer Induktor entsteht.
EP81401776A 1980-11-25 1981-11-09 Induktor mit Wanderfeld und orientiertem Fluss für eine Umrührrolle beim Stranggiessen von Brammen Expired EP0053060B2 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81401776T ATE6995T1 (de) 1980-11-25 1981-11-09 Induktor mit wanderfeld und orientiertem fluss fuer eine umruehrrolle beim stranggiessen von brammen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8024960A FR2494607A1 (fr) 1980-11-25 1980-11-25 Inducteur a champ glissant et a flux oriente pour rouleau- brasseur de coulee continue de brames
FR8024960 1980-11-25

Publications (3)

Publication Number Publication Date
EP0053060A1 EP0053060A1 (de) 1982-06-02
EP0053060B1 true EP0053060B1 (de) 1984-04-11
EP0053060B2 EP0053060B2 (de) 1987-08-12

Family

ID=9248314

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81401776A Expired EP0053060B2 (de) 1980-11-25 1981-11-09 Induktor mit Wanderfeld und orientiertem Fluss für eine Umrührrolle beim Stranggiessen von Brammen

Country Status (14)

Country Link
US (1) US4429731A (de)
EP (1) EP0053060B2 (de)
JP (1) JPS6055217B2 (de)
AT (1) ATE6995T1 (de)
AU (1) AU543464B2 (de)
BR (1) BR8107601A (de)
CA (1) CA1179110A (de)
CS (1) CS236475B2 (de)
DE (1) DE3163108D1 (de)
ES (1) ES507396A0 (de)
FR (1) FR2494607A1 (de)
IN (1) IN159609B (de)
MX (1) MX154192A (de)
ZA (1) ZA817942B (de)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2528739B1 (fr) * 1982-06-18 1985-08-02 Siderurgie Fse Inst Rech Procede et installation de brassage electromagnetique de brames metalliques, notamment d'acier, coulees en continu
FR2601270A1 (fr) * 1986-07-08 1988-01-15 Alsthom Dispositif electromagnetique, a champ tournant, de brassage du metal liquide en coulee continue.
CA2077145A1 (en) * 1991-08-29 1993-03-01 Julian Szekely Method and apparatus for the magnetic stirring of molten metal in a twin roll caster
US8011417B2 (en) * 2006-07-07 2011-09-06 Rotelec Process for the continuous casting of flat metal products with electromagnetic stirring and implementation installation
CN100450668C (zh) * 2006-07-07 2009-01-14 湖南中科电气股份有限公司 高磁场板坯二冷区电磁搅拌辊
FR2957829B1 (fr) * 2010-03-23 2012-11-09 Rotelec Sa Rouleau brasseur pour machine de coulee continu de brames
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
AT522811B1 (de) * 2019-07-17 2021-10-15 Primetals Technologies Austria GmbH Elektromagnetische Spulenanordnung und elektromagnetische Rührrolle für eine Stranggussanlage
EP3766600B1 (de) * 2019-07-17 2022-09-07 Primetals Technologies Austria GmbH Elektromagnetische spulenanordnung für eine elektromagnetische rührrolle einer stranggussanlage
EP3871803A1 (de) 2019-07-17 2021-09-01 Primetals Technologies Austria GmbH Elektromagnetische spulenanordnung und elektromagnetische rührrolle für eine stranggussanlage

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2187467A1 (en) * 1972-06-08 1974-01-18 Siderurgie Fse Inst Rech Slab casting machine - with metal stirring by electrically wound withdrawal rolls
FR2237711A1 (en) * 1973-07-20 1975-02-14 Cem Comp Electro Mec Stirring molten cores of slabs in continuous casting - using induction coils housed in guide and support rolls

Also Published As

Publication number Publication date
CA1179110A (en) 1984-12-11
BR8107601A (pt) 1982-08-17
JPS57134253A (en) 1982-08-19
EP0053060A1 (de) 1982-06-02
MX154192A (es) 1987-06-10
ES8300536A1 (es) 1982-11-01
US4429731A (en) 1984-02-07
FR2494607A1 (fr) 1982-05-28
FR2494607B1 (de) 1982-12-17
AU543464B2 (en) 1985-04-18
CS236475B2 (en) 1985-05-15
ZA817942B (en) 1982-11-24
IN159609B (de) 1987-05-30
AU7767781A (en) 1982-06-03
ES507396A0 (es) 1982-11-01
DE3163108D1 (en) 1984-05-17
EP0053060B2 (de) 1987-08-12
ATE6995T1 (de) 1984-04-15
JPS6055217B2 (ja) 1985-12-04

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