EP0022711B1 - Procédé et dispositif de brassage destinés à améliorer la qualité d'un métal coulé en continu - Google Patents

Procédé et dispositif de brassage destinés à améliorer la qualité d'un métal coulé en continu Download PDF

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Publication number
EP0022711B1
EP0022711B1 EP80401027A EP80401027A EP0022711B1 EP 0022711 B1 EP0022711 B1 EP 0022711B1 EP 80401027 A EP80401027 A EP 80401027A EP 80401027 A EP80401027 A EP 80401027A EP 0022711 B1 EP0022711 B1 EP 0022711B1
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EP
European Patent Office
Prior art keywords
magnetic field
magnetic
inductor
rotating
rabbling
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
EP80401027A
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German (de)
English (en)
French (fr)
Other versions
EP0022711A1 (fr
Inventor
Jean-Paul Pouillange
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.)
Compagnie Electro Mecanique SA
Original Assignee
Compagnie Electro Mecanique SA
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Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9227795&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0022711(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Compagnie Electro Mecanique SA filed Critical Compagnie Electro Mecanique SA
Priority to AT80401027T priority Critical patent/ATE2655T1/de
Publication of EP0022711A1 publication Critical patent/EP0022711A1/fr
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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
    • 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
    • B22D11/10—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

Definitions

  • the invention relates to a method and a stirring device intended to improve the quality of a continuously cast metal.
  • This is in particular the aim, in the production by continuous casting, of devices for stirring the metal during casting, that is to say in the ingot mold, and during solidification at levels situated below the ingot mold. where an area still liquid, frequently called liquid well, is in the middle of the ingot when cooling.
  • Such mixing makes it possible on the one hand to reduce the length of the crystals during solidification, on the other hand to distribute the impurities which would not have risen to the surface above the ingot mold.
  • Electromagnetic stirring devices for billets or blooms which operate by the action of a rotating magnetic field passing through the billet in the course of solidification, the magnetic field being created by inductor coils arranged in the mold or below it. this.
  • Such a device is described for example in the French patent application of the Applicant published under No. 2,355,392, or in the patent USA 3153820.
  • One of these devices described in French patent of the Applicant No. 2 231 454, comprises an inductor arranged inside a roll for guiding the slab below the ingot mold, and creating around it a sliding field in a direction parallel to the axis of the roll and perpendicular to the axis of the casting, so as to create a lateral movement of the part still liquid located behind the cooled crust.
  • the subject of the invention is a method and a device intended to improve the quality of a continuously cast metal which have, for the same effects as described above, a clearly higher yield and an increased stirring movement.
  • the method is characterized in that an inductor rotating produces a fixed magnetic field with respect to the inductor about an axis parallel at least to one of the surfaces of the cast product.
  • the relative displacement will be a rotational displacement around an axis perpendicular to the pouring axis or an axis parallel thereto.
  • the devices corresponding to this process will therefore include means for producing a constant magnetic field consisting of permanent magnets or electromagnets, the magnetizing power therefore being provided in this second case by a direct current as in a rotor of a synchronous machine. .
  • the devices for rotating these devices are provided so as to create the relative movement of the magnets and thus to cause eddy currents in the liquid metal and to give rise to forces for the circulation of the liquid metal.
  • FIG. 1 In Figure 1 is shown in 1 a billet being cooled below the mold, the still liquid metal being shown in 2.
  • a stirring device 3 is placed around the billet. It comprises an inductor 4 comprising a cylindrical yoke 5 in which are fixed two inductor poles 6 made of magnetically hard material so as to create a uniform field crossing the cylindrical space partially occupied by the billet. To facilitate the realization, these poles can be executed by stacking elements relatively thin 7 arranged according to generatrices and glued together.
  • a particularly well suited material for making such a stack is magnetic rubber, which can be arranged in a uniform layer, either pre-magnetized or magnetizable after installation, for example by placing an alternator rotor inside the available cylindrical space. in which a suitable shock current will be sent.
  • the cylinder head 5 is arranged in two mounting elements 8 and 9 and the assembly of the inductor 4 is placed in a casing 10 of steel which has a lower disc part 11 and a cylindrical lateral part 12, so that the inductor 4 can rotate inside the housing 10.
  • rollers 13a and 13b are provided rotating around axes linked to the mounting elements 8 and 9 and rolling on tracks 14 and 15 integral with the casing 10.
  • the frame 8 has a toothed wheel 16 which allows the inductor to be driven by the electric motor 17 and the gear 18.
  • a cover 19 of ordinary steel makes it possible to serve as a magnetic screen for the leakage flows as well as the wall 11.
  • the assembly of the inductor 4 and the casing 10 is capped by a water jacket 20, of stainless steel for example, comprising a vertical double-walled tube 20a and a double-walled disc 20b, so as to protect the inductor against radiation from the billet and metal splashes from the ingot mold.
  • a water jacket 20 of stainless steel for example comprising a vertical double-walled tube 20a and a double-walled disc 20b, so as to protect the inductor against radiation from the billet and metal splashes from the ingot mold.
  • This shirt will be crossed by a stream of water.
  • poles made of hard magnetic materials make the latter out of magnetically soft steel surrounded by an inductor winding traversed by a direct current: In this case electrical contacts with wipers must be provided between the windings in a rotating system and the fixed part where the electric current is brought.
  • a device with permanent magnets as described above lends itself remarkably well to its installation in a mold.
  • the rotating assembly will preferably be placed in an O-ring casing partially formed by the ingot mold and if necessary filled with water. Only the watertight drive shaft of the drive gear will pass through.
  • the proposed system Compared to solutions with a fixed electromagnetic inductor supplied with alternating current, the proposed system has, on the one hand, the advantage of greater simplicity and, on the other hand, makes it possible to produce fields of higher intensity and not require reactive power other than that requested by the motor which will only supply the power necessary for stirring, mechanical losses and eddy current losses in the solidified part of the billet and in the fixed parts (screens and jacket of 'water).
  • the inductive poles 4 diametrically opposite a helical shape so that the electric currents generated in the billet by the rotation of the inductors are inclined relative to the casting axis and generate forces which have a component parallel to the casting axis, either in the upward direction or in the downward direction, so as to create a helical stirring, which gives an improvement in the quality of the metal greater than that given by simple rotary stirring.
  • FIG. 2 which schematically represents a slab 21 during continuous casting in the part located below the ingot mold, as well as the pairs of guide rollers 22 of this slab, certain pairs of rollers have been shown such as 221, 222, 223, 224 which represent the particularity of being provided at each of their ends with inductors with cylindrical permanent magnets 23 and 24 on either side of the slab and magnetized transversely in a homogeneous manner so that the lines of force of the magnetic field are perpendicular to a diametral plane.
  • the magnetic axes of the cylindrical permanent magnets 23 and 24 are oriented relative to each other as shown in Figure 3 and rotate. the same speed, different from that of the guide rollers and their arrangement inside the guide roller will be described later.
  • FIG. 3 which schematically gives the orientation of the magnetic axes of the magnets 24 located on one side of the slab and designated by 241a, 241b, 242a, 242b, 243a, 243b, 244a, 244b
  • the straight arrows passing by the center of the rollers indicate at a given instant the direction of the magnetization
  • the curved arrows located in the circles representing the magnets give the directions of rotation printed to these magnets.
  • FIG. 4 gives the detail of a stirring roller such as 22 in the vicinity of one of its ends which contains a cylindrical magnet 24.
  • the hollow guide roller 22 rotates in bearings 25 located at its two ends. It is made in three parts, a central part 22a and two end caps 22b. The central part is located so as to receive at each of its ends the cylindrical magnets 24 located inside a cylindrical sheath 26 of non-magnetic steel. The magnets are rotated by a shaft 27 and rotate in roller bearings 29 and 30 housed in the parts 22a and 22b.
  • a cooling air circulation is provided between the axis and the plug 22b, and countersinks 32 and 33 allow the arrival area in the annular cylindrical space 34 located between the sheath 26 and the guide roller 22 and to come out to go to the other end of it by a central channel 28. Arrows 35 to 38 materialize the circulation of cooling air.
  • the magnet can be constituted by a stack of ferrite washers in the sheath 26. It can also be made from a ferrite powder mixed with thermosetting resin then injected and hardened.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • General Induction Heating (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
  • Soft Magnetic Materials (AREA)
EP80401027A 1979-07-12 1980-07-08 Procédé et dispositif de brassage destinés à améliorer la qualité d'un métal coulé en continu Expired EP0022711B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80401027T ATE2655T1 (de) 1979-07-12 1980-07-08 Verfahren und ruehrvorrichtung zur qualitativen verbesserung eines stranggegossenen metalls.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7918088A FR2465535A1 (fr) 1979-07-12 1979-07-12 Procede et dispositif de brassage destines a ameliorer la qualite d'un metal coule en continu
FR7918088 1979-07-12

Publications (2)

Publication Number Publication Date
EP0022711A1 EP0022711A1 (fr) 1981-01-21
EP0022711B1 true EP0022711B1 (fr) 1983-03-02

Family

ID=9227795

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80401027A Expired EP0022711B1 (fr) 1979-07-12 1980-07-08 Procédé et dispositif de brassage destinés à améliorer la qualité d'un métal coulé en continu

Country Status (7)

Country Link
EP (1) EP0022711B1 (enrdf_load_stackoverflow)
JP (1) JPS5659568A (enrdf_load_stackoverflow)
AT (1) ATE2655T1 (enrdf_load_stackoverflow)
CA (1) CA1144336A (enrdf_load_stackoverflow)
DE (1) DE3062197D1 (enrdf_load_stackoverflow)
ES (1) ES493321A0 (enrdf_load_stackoverflow)
FR (1) FR2465535A1 (enrdf_load_stackoverflow)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2511274A1 (fr) * 1981-08-11 1983-02-18 Sumitomo Metal Ind Procede et dispositif de brassage magnetique a aimants permanents
FR2537470A2 (fr) * 1982-01-13 1984-06-15 Vallourec Rotor magnetique pour coulee continue de corps creux
FR2519567A1 (fr) * 1982-01-13 1983-07-18 Vallourec Procede de fabrication de corps creux par coulee continue a l'aide d'un champ magnetique et dispositif de mise en oeuvre du procede
FR2628994B1 (fr) * 1988-03-28 1992-04-03 Vives Charles Procede de production de gelees metalliques thixotropes par rotation d'un systeme d'aimants permanents dispose a l'exterieur de la lingotiere
AU6568196A (en) * 1995-10-12 1997-04-17 Alusuisse Technology & Management Ltd. Process for manufacturing a metal ingot with thixotropic properties
IT201800006635A1 (it) * 2018-06-25 2019-12-25 Metodo di contenimento di una bramma durante la colata

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1140200A (fr) * 1955-01-15 1957-07-16 Boehler & Co Ag Geb Procédé pour la mise en mouvement du métal en fusion dans les installations de coulée continue
US3153820A (en) * 1961-10-09 1964-10-27 Charles B Criner Apparatus for improving metal structure
FR2231454A2 (en) * 1973-05-29 1974-12-27 Cem Comp Electro Mec Slab casting machine - with metal stirring by electrically wound withdrawal rolls
FR2418047A1 (fr) * 1978-02-28 1979-09-21 Sumitomo Metal Ind Appareil pour coulee continue

Also Published As

Publication number Publication date
FR2465535A1 (fr) 1981-03-27
DE3062197D1 (en) 1983-04-07
CA1144336A (en) 1983-04-12
EP0022711A1 (fr) 1981-01-21
FR2465535B1 (enrdf_load_stackoverflow) 1983-04-15
ATE2655T1 (de) 1983-03-15
ES8105171A1 (es) 1981-05-16
ES493321A0 (es) 1981-05-16
JPS5659568A (en) 1981-05-23

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