EP0165793A2 - Stator zum elektromagnetisch bewerkstelligten rotierenden Rühren - Google Patents

Stator zum elektromagnetisch bewerkstelligten rotierenden Rühren Download PDF

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Publication number
EP0165793A2
EP0165793A2 EP85304307A EP85304307A EP0165793A2 EP 0165793 A2 EP0165793 A2 EP 0165793A2 EP 85304307 A EP85304307 A EP 85304307A EP 85304307 A EP85304307 A EP 85304307A EP 0165793 A2 EP0165793 A2 EP 0165793A2
Authority
EP
European Patent Office
Prior art keywords
mould
segments
jacket
stator
group
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Withdrawn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
EP85304307A
Other languages
English (en)
French (fr)
Other versions
EP0165793A3 (de
Inventor
Libor F. Rostik
John W. Beaton
Christopher William Avent
Ronald E. Lincoln
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.)
Co Steel International Ltd
Original Assignee
Co Steel International Ltd
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 Co Steel International Ltd filed Critical Co Steel International Ltd
Publication of EP0165793A2 publication Critical patent/EP0165793A2/de
Publication of EP0165793A3 publication Critical patent/EP0165793A3/de
Withdrawn legal-status Critical Current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
    • B22D11/10—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

  • This invention relates to means for providing electro-magnetic stirring for a continuous casting mould for steel.
  • This invention provides electromagnetic stirring apparatus for the provision of a magnetic field rotating about the path of steel passing through and solidifying in a continuous casting mould, the purpose of such field being to cause rotation of the steel which is still liquid in the mould.
  • Each pair of the groups was energized in accord with a phase of alternating current and the electrical connection to the groups of a pair was such that current in one group was 180° out of phase with the current in the other group.
  • the phase relationship between different pairs of groups was chosen so that the field produced by the pairs of groups taken collectively was transverse to the steel travel direction and rotated about the mould axis which is parallel to said direction to produce a corresponding rotation in the steel.
  • the stirring segments are contained in a distinct substantially water-tight enclosure preferably designed for location within existing jackets, so that the ordinary cooling water for the mould jacket cannot contact the windings or their insulation. In this was, failure of the windings due to the contact and I or electrochemical action by such ordinary cooling water is avoided. From another point of view the use of a separate water-tight container for the stirrer segment avoids the necessity of special control for the mould cooling water or the need for special insulation of the windings and of the permeable path to avoid contact by such water.
  • the winding segments connected to be energized to produce electromagnetic stirring, are constructed of hollow metal to define a bore therethrough and a cooling medium from an external supply is caused to circulate through the bore in the segments.
  • the conductors are thus internally cooled and do not therefore require cooling by the mould jacket water supply. Since the supply of the cooling medium to the winding segment bores is independent of the mould jacket coolant supply, it may be maintained pure and recirculated in a manner analagous to a refrigerator cycle.
  • An aqueous ethylene glycol solution is preferably used as the cooling medium. However, other cooling or regrigerating gas cr liquid may be used.
  • a rectangular continuous casting mould includes opposed vertical mould walls 10A, 10C, on the short sides and opposed mould walls 10B and 10D on the long sides, to define a rectilinear cross-section as indicated in Figure 5.
  • Customarily two of the opposing walls here 10B and 10D (see Figure 1) will be slightly curved in the same sense to initiate a change of direction of the steel slab being formed.
  • Extending outwardly from the mould are upper and lower horizontal plates 12 and 14.
  • Upper wall 12 comprises sub-walls 12U, 12M, 12L.
  • Upper wall 12 with an intermediate lower wall 16 and lower wall 14 define the upper and lower limits for a mould jacket for receiving coolant water for cooling the muold.
  • the inner boundary of the mould jacket is defined by the mould walls 10A,10B,10C and 10D while the outer wall of the mould jacket is formed by outer walls 18A, 18B, 18C and 18D on the four sides of the mould.
  • the magnetic stirrer jacket defined by upper wall 12 and lower walls 14 and 16, mould walls 10 and outer jacket walls 18, forms a chamber of the depth shown and forming a rectangular annulus about the mould in horizontal cross-section.
  • Baffle wall 19 surrounding the mould wall but spaced therefrom and spaced from wall 12 is indicative of baffles generally used to provide the desired course for the coolant water over and about the mould wall.
  • the magnetic stirring stator in accord with the invention is contained within an enclosure which takes the form of a rectangular annulus designed to be received within the mould jacket.
  • the stator enclosure has upper and lower walls 20 and 22, defining the rectangular annulus shape and inner and outer walls on each of the four sides of the mould and forming with the upper and lower walls a water-tight enclosure for the windings.
  • Upper and lower walls 20 and 22 are made of steel of high magnetic permeability.
  • Inner walls 24A, 24B, 24C and 24D on the four sides of the mould are formed of stainless steel of low magnetic permeability and such walls are joined to each other and to the upper and lower walls in a fluid tight manner.
  • the four outer walls of stator enclosure are composed of outer layers 28A - D of relatively non-magnetic stainless steel and linings 30A - D of magnetically permeable steel.
  • the four side walls 24, 28, 30 (A-D) are joined at inner and outer corners and to the upper and lower walls 20 and 22 to complete the water tight stator enclosure which is therefore protected from the cooling wa terin the mould jacket which surrounds the stator enclosure.
  • the four outer wall liners 30 form a magnetically permeable path extending around the outside of the stator housing and surrounding the electric windings to be described. Such magnetic path is augmented by upper and lower walls 2( and 22 which are also of magnetically permeable material.
  • Such magnetic path is also significantly augmented by plates 32A - D of magnetically permeable material.
  • the components of the magnetically permeable path are indicated in schematic Figure 4.
  • Plates 32A - D are respectively attached to the linings 30A - D of the corresponding of the outer wall at its upper and lower extremities and slope inward from each extremity to provide a vertical intermediate extent 33b adjacent the corresponding vertical extent of the stator winding to be described.
  • Magnetically permeable plates 32B - D bear the same relationship to the outer walls to which they are attached and to the vertical extents of the windings on the corresponding sidesof the mould. It will be noted that the vertical extents of plates 32A - D join at the corners to form a magnetically permeable path about and adjacent the longitudinal segments of the windings.
  • the preferred method of supporting the stirrer jacket within the mould jacket is by welding steel projections 31 running transversely on each, the outside of walls of plate 28B of the stirrer jacket. Corresponding projections 33 are welded on the inside of wall 18A of the mould jacket. During installation of the stirrer, with the upper wall of the mold jacket removed, the stirrer is lowered into place until it rests supported by projections 31 or projections 33. The location of the suspended stirrer jacket is selected to allow the circulation of mould cooling water below, above and on all sides of the stirrer jacket.
  • sub wall 21 L forms part of the normal mould assembly and extends between mould wall 10 and mould jacket wall 18. This arrangement and that to be described are shown in relation to side 'B' of the apparatus in Figure 12.
  • boss 17 is part of the upper wall 20 and each boss 17 and wall 20 below are provided with threaded bore to receive bolt 15 whose head is countersunk in sub wall 12 as shown in Figure 12.
  • the boss 17 bolted with wall 20 to sub-wall 12L prevents upward movement of the electromagnetic stirring stator during vibration of the mould. Ridge 33 supporting ridge 31 on the stator prevents downward movement of the stator relative to the mould during such vibration.
  • the threaded bores in boss 17 and wall 20 may be used by threading bolts therein which are attached to apparatus for lifting or lowering the stator.
  • the winding segments are composed of copper extrusions 38 of square outline covered with insulation 40.
  • the windings are preferably formed into coils the shapes of which are best indicated in Figure 2. These shapes may be considered to be coils made up of turns of conducting segments with each turn having the shape (if flat) of a wide square "0" with curved corners having upper and lower transverse extents T joined by right and left hand longitudinal extents LR and LL.
  • the rectangular "0" is not flat but bent to correspond to the corners of the inner wall of the stator jacket so that the transverse segments TA which extend across one inner wall (say) 24A and are bent about the corner where it meets the -adjacent inner walls 248,or 24D -so-that the longitudinal segments LA are disposed along the adjacent inner walls 24B and 24D.
  • the longitudinal segments in a coil 34 cover an area from adjacent the corner of two walls 24 to approximately the middle of the wall on which the longitudinal extents of-that coil are located.
  • Opposed coils 34A and 34C with transverse segments TA and TC along inner walls 24A and 24C on the short sides therefore together provide a 'group' (in the sense used in the application and claims) of longitudinal segments LRA and LLC together covering the most, and the central transverse portion of, wall 24B with the left hand longitudinal segments LLC of coil C and the right hand longitudinal segments LRA of coil A providing such extents ('right' and 'left' are used in the sense of an observer looking inwardly toward the mould axis).
  • the right hand longitudinal segments LRC of coil C and the left hand longitudinal extents LLA of coil A form the group of longitudinal segments on side 24D.
  • each coil- 34A, 34B, 34C and 34D preferably contains an inner layer of turns of a square spiral arrangement connected in series with an outer layer of turns in a square spiral arrangement.
  • Each coil is connected in series with the opposite coil i.e. coil 34A with coil 34C and coil 34B with coil 34D.
  • phase 1 connected through outer coil 34A, inner coil 34A, inner coil 34C, outer coil 34C and to common ground
  • phase ? 90° out of phase with phase 1
  • the layers-and coils are connected so that at-a given time all currents in the segments on side B (from the longitudinal segments of coils 34A and 34C) are in one direction (here up the mould) and all currents on side D from the other longitudinal extents of coils 34A and 34C are in the opposite direction (here down the mould).
  • connection for coils 34B and 34D are arranged so that these coils' longitudinal extents carry instantaneously current in the up direction on the A side of the mould and in the down direction on the C side of the mould.
  • Each series circuit will of course vary cyclically in accord with the AC supply. Since phase 1 and phase 2 are energized to be 90° out of phase with each other, it will be obvious that, with the connections and the energization shown, the combined effect of the coils will be to provide a magnetic field across the mould generally transverse to the mould axis and rotating thereabout with the frequency of the AC supply.
  • a 'group' of winding segments being all those segments with longitudinal extents corresponding to a single phase and in the preferred embodiment forming all of the segments on one side of the mould.
  • the constituency of such groups is as follows: With the coils thus arranged the plates 32 connect at their extremities to the magnetically permeable liner 30 and at their corners to each other but are as close as possible to the longitudinal extents of the windings to bring the magnetically permeable path as close as possible to the longitudinal winding segments.
  • the stirring apparatus is preferably arranged so that the upper end of the vertical segments corresponds approximately to the expected level of the meniscus for the poured steel.
  • the coolant fluid is supplied to the inner bores 42 defined in the hollow conducting segments. We prefer to do this by causing the fluid to flow along the electrical paths indicated in Figure 6 from the common ground to the phase 1 and phase 2 terminals in parallel.
  • a schematic of the liquid circuit is shown in Figure 8. Although the components will vary widely with the coolant fluid or refrigerant used, the principle will remain the same. Figure 8 presupposes that the coolant is a 30% aqueous solution of ethylene glycol.
  • a pump 50 supplies the solution to a chiller 52 and the chilled solution is supplied to the phase 1 and phase 2 coils in parallel.
  • the coolant liquid emerging from the coil bores is filtered, purified, de-ionised and, if necessary, the solution strength adjusted at the apparatus represented by block 34.
  • the treated liquid is returned to the pump for cooling and recirculation to the coils.
  • the coolant circuit may be made in any one of a number of ways well known to those skilled in the art.
  • Another coolant fluid including a gaseous state refrigerant such as freon can be used with suitable changes in the circuit exterior to the coils which changes would be obvious to those skilled in the art. It is important, from the point of view of the invention, to note that the coolant circuit for the coils is completely independant of the coolant water supply for the mould jacket,which mould jacket coolant water is customarily dirty and conductant to an undesireable degree.
  • connections 56 - 1, 56 - 2 and 56 - C from the coil terminals are designed to extend through walls 30B, 28B and 185 to carry hollow electrical conductors with central coolant bores to the outside of the mould jacket for connection thereto of electrical and coolant fluid supplies.
  • the connections of the coolant liquid supply and return to conductors inside and outside the mould jacket utilize the fact that a liquid contacting the inside only of hollow conductors should not affect the electrical voltage or current characteristics.
  • phase A and phase B A.C. inputs we note that, at this time, it is preferred to use between 3 0 and 5 Hz.
  • connection to and between the coils 34A, 34B, 34C, and 34D will be by a hollow conductor carrying electric current and connected for electrical flow in accord with the schematics of Figures 6 or 7 and carrying coolant and connected for coolant flow on the same courses as shown in Figure 7.
  • the connections from terminals 56 to the coils 34 and between the coils 34 will be located in the space C ( Figure 1) between the magnetically permeable plate 32 and magnetically permeable plate 30 on the same side of the mould.
  • Figure 11 shows-connection 75 from terminal 56C to the inner layer of coil 34B (see also Figure 8).
  • Figure 11 also shows a fragment connection 77 from the terminal 56C which is directed to the right in Figure 11 to the outer layer of coil 34C (see also Figure 8).
  • Figure 11 also shows a fragment of connection 79 from the inner layer of coil 34A to the inner layer of coil 34C.
  • the other connection to and between the coils will be of similar arrangement with the connections outside of plates 32 and connected with the coils proper through apertures 81 (see Figure 11 in the plates).
  • the components described specifically are for a rectangular mould, it will be obvious that the invention applies to moulds of square, circular form or any other shape.
  • Whatever shape the four-coils 34 may be shaped for application to give four longitudinal segment groups each one carrying current 90° out of -phase (in the same sense) with the adjacent group and with each set of longitudinal segments in a group made up of right and -left hand segments of two opposing colls.
  • stator enclosure is formed of steel in the preferred embodiment, the enclosure may be made of fibreglass resin or otherwise so long as a magnetically permeable path is provided about the winding.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Motor Or Generator Cooling System (AREA)
EP85304307A 1984-06-20 1985-06-17 Stator zum elektromagnetisch bewerkstelligten rotierenden Rühren Withdrawn EP0165793A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US62246684A 1984-06-20 1984-06-20
US622466 1984-06-20

Publications (2)

Publication Number Publication Date
EP0165793A2 true EP0165793A2 (de) 1985-12-27
EP0165793A3 EP0165793A3 (de) 1986-09-17

Family

ID=24494273

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85304307A Withdrawn EP0165793A3 (de) 1984-06-20 1985-06-17 Stator zum elektromagnetisch bewerkstelligten rotierenden Rühren

Country Status (2)

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EP (1) EP0165793A3 (de)
JP (1) JPS6114054A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6340049B1 (en) * 1998-03-06 2002-01-22 Abb Ab Device for casting of metal
WO2002038310A1 (en) * 2000-11-08 2002-05-16 Abb Ab Device for casting metal
WO2004018128A2 (en) * 2002-08-20 2004-03-04 Abb Inc. Cooling electromagnetic stirrers
CN117450781A (zh) * 2023-12-08 2024-01-26 中国机械总院集团沈阳铸造研究所有限公司 一种定点浇注铸造炉

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2963758A (en) * 1958-06-27 1960-12-13 Crucible Steel Co America Production of fine grained metal castings
DE2362720A1 (de) * 1972-12-21 1974-06-27 Cem Comp Electro Mec Elektromagnetische ruehrvorrichtung fuer eine stranggussanlage
DE2528931A1 (de) * 1974-07-22 1976-06-10 Usinor Elektromagnetische zentrifugierverfahren
US4454909A (en) * 1980-03-13 1984-06-19 Co-Steel International Limited Mold stator for electromagnetic stirring

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2963758A (en) * 1958-06-27 1960-12-13 Crucible Steel Co America Production of fine grained metal castings
DE2362720A1 (de) * 1972-12-21 1974-06-27 Cem Comp Electro Mec Elektromagnetische ruehrvorrichtung fuer eine stranggussanlage
DE2528931A1 (de) * 1974-07-22 1976-06-10 Usinor Elektromagnetische zentrifugierverfahren
US4454909A (en) * 1980-03-13 1984-06-19 Co-Steel International Limited Mold stator for electromagnetic stirring

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6340049B1 (en) * 1998-03-06 2002-01-22 Abb Ab Device for casting of metal
WO2002038310A1 (en) * 2000-11-08 2002-05-16 Abb Ab Device for casting metal
WO2004018128A2 (en) * 2002-08-20 2004-03-04 Abb Inc. Cooling electromagnetic stirrers
WO2004018128A3 (en) * 2002-08-20 2004-06-17 Abb Inc Cooling electromagnetic stirrers
CN100335204C (zh) * 2002-08-20 2007-09-05 Abb公司 电磁搅拌器和冷却电磁搅拌器的方法
AU2003257316B2 (en) * 2002-08-20 2008-07-03 Abb Inc Cooling electromagnetic stirrers
CN117450781A (zh) * 2023-12-08 2024-01-26 中国机械总院集团沈阳铸造研究所有限公司 一种定点浇注铸造炉

Also Published As

Publication number Publication date
JPS6114054A (ja) 1986-01-22
EP0165793A3 (de) 1986-09-17

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Inventor name: ROSTIK, LIBOR F.

Inventor name: BEATON, JOHN W.

Inventor name: LINCOLN, RONALD E.

Inventor name: AVENT, CHRISTOPHER WILLIAM