EP2650063B1 - Molding device for continuous casting having stirring device - Google Patents

Molding device for continuous casting having stirring device Download PDF

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Publication number
EP2650063B1
EP2650063B1 EP12848633.9A EP12848633A EP2650063B1 EP 2650063 B1 EP2650063 B1 EP 2650063B1 EP 12848633 A EP12848633 A EP 12848633A EP 2650063 B1 EP2650063 B1 EP 2650063B1
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EP
European Patent Office
Prior art keywords
magnetic field
field generation
generation device
casting mold
melt
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Application number
EP12848633.9A
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German (de)
English (en)
French (fr)
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EP2650063A4 (en
EP2650063A1 (en
Inventor
Kenzo Takahashi
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Individual
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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
    • 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
    • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • 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
    • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • B22D11/003—Aluminium alloys
    • 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
    • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • B22D11/004—Copper alloys
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/041—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for vertical casting
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/055—Cooling the moulds
    • 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
    • B22D11/112—Treating the molten metal by accelerated cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/02—Use of electric or magnetic effects

Definitions

  • the present invention relates to a molding device for continuous casting, which is equipped with an agitator, of continuous casting equipment that produces a billet, a slab or the like made of non-ferrous metal of a conductor (conductive body), such as Al, Cu, Zn, or an alloy of at least two of them, or an Mg alloy, or other metal.
  • a conductor conductive body
  • a melt agitating method to be described below has been employed in a casting mold for continuous casting. That is, for the improvement of the quality of a slab, a billet, or the like, in a process for solidifying the melt, that is, when the melt passes through the casting mold, a moving magnetic field, which is generated from the outside of the casting mold by an electromagnetic coil, is applied to the melt present in the casting mold so that agitation occurs in the melt not yet solidified.
  • a main object of this agitation is to degas the melt and to uniformize the structure.
  • the electromagnetic coil is disposed at the position close to high-temperature melt, the cooling of the electromagnetic coil and troublesome maintenance are needed and large power consumption is obviously needed.
  • the generation of heat from the electromagnetic coil itself caused by the power consumption cannot be avoided, and this heat should be removed. For this reason, there are various problems in that the device itself cannot but become expensive, and the like.
  • Patent Literature 1 JP 9-99344 A
  • the invention has been made to solve the above-mentioned problems, and an object of the invention is to provide a molding device for continuous casting equipped with an agitator that reduces the amount of generated heat, is easy to carry out maintenance, is inexpensive, and is easy to use in practice.
  • the object above can be achieved by the features defined in the claims.
  • a molding device for continuous casting equipped with an agitator is a device which receives liquid-phase melt of a conductive material and from which a solid-phase cast product is taken out through the cooling of the melt.
  • the molding device includes a casting mold including a casting space that includes an inlet and an outlet at a central portion of a substantially cylindrical side wall and a magnetic field generation device receiving chamber that is formed in the side wall and is positioned outside the casting space, the casting mold receiving the liquid-phase melt from the inlet into the casting space and discharging the solid-phase cast product from the outlet through the cooling in the casting space, and an agitator provided so as to correspond to the casting mold, the agitator including a magnetic field generation device having an electrode unit that includes first and second electrodes supplying current to at least the liquid-phase melt present in the casting space, and a permanent magnet that applies a magnetic field to the liquid-phase melt.
  • the magnetic field generation device is received in the magnetic field generation device receiving chamber of the casting mold, generates magnetic lines of force toward a center in a lateral direction, makes the magnetic lines of force pass through a part of the side wall of the casting mold and reach the casting space, and applies lateral magnetic lines of force, which cross the current, to the melt.
  • melt M of non-ferrous metal is discharged from a melt receiving box that is called a tundish and is poured into a casting mold that is provided on the lower side. Cooling water for cooling the casting mold is circulated in the casting mold. Accordingly, high-temperature melt starts to solidify from the outer periphery thereof (a portion thereof close to the casting mold) from the moment that the high-temperature melt comes into contact with the casting mold.
  • melt which is positioned at the central portion of the casting mold, is distant from the wall of the casting mold that is being cooled, the solidification of the melt positioned at the central portion of the casting mold is obviously later than that of the melt positioned at the peripheral portion of the casting mold.
  • two kinds of melt that is, liquid (liquid-phase) melt and a solid (solid-phase) cast product are simultaneously present in the casting mold while being adjacent to each other with an interface interposed therebetween.
  • gas remains in the cast product (product) having been changed into a solid and causes the quality of the product to deteriorate. For this reason, degassing is facilitated by the agitating of the melt that is not yet solidified.
  • the electromagnetic agitator which uses electricity as power, has been used for the agitating in the related art.
  • the invention is to provide a molding device for continuous casting equipped with an agitator that does not use the electromagnetic agitator using electricity as power and uses permanent magnets.
  • Fig. 1(a) is an explanatory plan view taken along line II(a) - II(a) of Fig. 1(a) , and mainly illustrates a part of an agitator 3 and a casting mold 2
  • Fig. 3(a) is an explanatory plan view of the magnetic field generation device 31 of the agitator 3.
  • a device broadly includes a melt supply unit 1 that supplies melt M of non-ferrous metal of a conductor (conductive body), such as Al, Cu, Zn, or an alloy of at least two of them, or an Mg alloy, or other metal; a casting mold 2 that receives the melt from the melt supply unit 1; and an agitator 3 that agitates the melt M present in the casting mold 2.
  • a central portion of the casting mold 2 forms a so-called casting space 2A(1) that includes an inlet 2A(1)1 and an outlet 2A(1)2.
  • the melt supply unit 1 includes a tundish (melt receiving box) 1A that receives melt M from a ladle (not illustrated) or the like.
  • the melt M is stored in the tundish (melt receiving box) 1A, inclusion is removed from the melt, and the melt M is supplied to the casting mold 2 from a lower opening 1B of the tundish at a constant supply rate. Only the tundish (melt receiving box) 1A is illustrated in Fig. 1 .
  • the casting mold 2 is adapted in this embodiment so that a columnar product P (billet) is taken out from the casting mold.
  • the casting mold 2 is formed so as to have a substantially cylindrical double structure (of which the cross-section has a ring shape). That is, the casting mold 2 includes an inner casting mold 21 and an outer casting mold 22 that are fitted to each other.
  • the inner casting mold 21 is provided on the inside and made of a non-conductive material (non-conductive refractory material) such as graphite (carbon).
  • the outer casting mold 22 is provided on the outside and made of a conductive material (conductive refractory material), such as aluminum or copper.
  • the magnetic field generation device 31 is assembled so as to be received within the side wall of the outer casting mold 22. Meanwhile, since the technical idea is the same as described above even when a prismatic product (slab) is taken out, the technical idea of an embodiment to be described below can be applied as it is. Briefly, the shapes of components corresponding to a rectangular slab, which is a product, are merely changed.
  • the casting mold 2 further includes a water jacket 23 outside the outer casting mold 22.
  • the water jacket 23 is to cool the melt M that flows into the inner casting mold 21. That is, cooling water flows into the water jacket 23 from an inlet (not illustrated) and is circulated in the water jacket 23, the outer portion of the outer casting mold 22 is cooled by the cooling water, and the cooling water is discharged from an outlet (not illustrated). The melt M is rapidly cooled by the water jacket 23. Since water jackets having various known structures may be employed as the water jacket 23, the detailed description thereof will not be provided here.
  • a plurality of electrode insertion holes 2a, 2a, ⁇ into which electrodes 32A to be described below are inserted are formed at a predetermined interval on the circumference of the casting mold 2 having the above-mentioned structure.
  • the electrode insertion holes 2a are formed so as to be inclined downward toward the center of the casting mold 2. For this reason, if the surface of the melt M is lower than the upper openings of the electrode insertion holes 2a even though the melt M is contained in the casting mold 2, there is no concern that the melt M will leak to the outside.
  • the agitator 3 is provided so as to be built in the side wall of the casting mold 2.
  • the agitator 3 includes a permanent magnet type magnetic field generation device 31, and a pair of upper and lower electrodes (positive and negative electrodes) 32A and 32B.
  • the magnetic field generation device 31 is formed in the shape of a ring (in a frame shape).
  • the entire inner peripheral portion of the magnetic field generation device may be magnetized to an N pole, and the entire outer peripheral portion of the magnetic field generation device may be magnetized to an S pole. Further, four portions of the inner and outer peripheral portions may be partially magnetized to an N pole and an S pole as illustrated in, for example, Fig. 3(a) , respectively.
  • the magnetic field generation device 31 does not necessarily need to be formed in the shape of a ring, and may be divided. That is, for example, as illustrated in Fig. 8(d) , the cross-section of the magnetic field generation device may be formed of a plurality of arc-shaped permanent magnet pieces ( Fig. 4 ). As briefly described above, particularly, as understood from Fig. 1(a) , the magnetic field generation device 31 is assembled in the outer casting mold 22.
  • the outer casting mold 22 includes a magnetic field generation device receiving chamber 22a which is formed in the side wall thereof and has a ring-shaped cross-section and of which a lower portion forms a release port.
  • the magnetic field generation device receiving chamber 22a is also understood from Fig. 2(b).
  • Fig. 2(b) is a view of the outer casting mold 22 when the outer casting mold 22 is seen from below.
  • Fig. 1(a) the outer casting mold 22 includes a magnetic field generation device receiving chamber 22a which is formed in the side wall thereof and has a ring-shaped cross-section and of which a lower portion forms a release port.
  • the magnetic field generation device receiving chamber 22a is also understood from Fig. 2(b).
  • Fig. 2(b) is a view of the outer casting mold 22 when the outer casting mold 22 is seen from below.
  • the magnetic field generation device 31 also having a ring-shaped cross-section is received in the magnetic field generation device receiving chamber 22a, which has a ring-shaped cross-section and of which the lower portion is opened, from below so that the position of the magnetic field generation device in the vertical direction can be adjusted by movement. That is, the magnetic field generation device 31 is provided so that the height of the magnetic field generation device can be adjusted in the magnetic field generation device receiving chamber 22a by desired units (not illustrated). Accordingly, it is possible to more efficiently agitate the melt M as described below by adjusting the height of the magnetic field generation device so as to correspond to liquid-phase melt M as understood from Fig. 1(a) .
  • the lower opening of the magnetic field generation device receiving chamber 22a is closed by a ring-shaped lid 22B.
  • the lid 22B may be formed so as to include discharge channels 22B (1) for discharging cooling water to the outside such as a lid 22B of Fig. 8(a) to be described below.
  • the four portions of the magnetic field generation device 31 are magnetized and form pairs of magnetic poles 31a, 31a, ⁇ as illustrated in Fig. 3(a) . That is, a portion of each of the magnetic poles 31a, 31a facing the inside of the ring-shaped magnetic field generation device is magnetized to an N pole, and a portion thereof facing the outside of the ring-shaped magnetic field generation device is magnetized to an S pole. Accordingly, magnetic lines of force ML generated from the N pole horizontally pass through the melt M that is present in the casting mold 2.
  • the magnetization may be contrary to this. That is, the inner portions of all magnetic poles may be magnetized to a certain pole and the outer portions thereof may be magnetized to an opposite pole.
  • One of additional characteristics of the invention is that a plurality of magnetic poles are disposed at a plurality of positions surrounding the melt M, which is not yet solidified, as understood from Fig. 3(a) . Accordingly, it is possible to improve the quality of the product P by agitating all the melt M with an electromagnetic force that is generated according to Fleming's rule by magnetic lines of force and current as described below. Therefore, the number of the magnetic poles is four in Fig. 3(a) , but is not limited to four and may be arbitrary.
  • the magnetic field generation device 31 does not need to be formed of a ring-shaped single body, and may be divided into a plurality of magnet bodies (magnet pieces), of which the number is arbitrary, as illustrated in Fig. 8(d) .
  • Fig. 1(a) current flows between the pair of electrodes 32A and 32B through the melt M and a cast product (product) P.
  • One electrode 32A may be used, but a plurality of electrodes 32A may be used. In this embodiment, two electrodes 32A are used.
  • the electrodes 32A are formed in the shape of a probe.
  • the respective electrodes 32A are inserted into the above-mentioned electrode insertion holes 2a. That is, the electrodes 32A penetrate into the casting mold 2 (the inner casting mold 21 and the outer casting mold 22) from the water jacket 23. Inner ends of the electrodes 32A are exposed to the inside of the inner casting mold 21, come into contact with the melt M, and conduct electricity to the melt M. Outer ends of the electrodes 32A are exposed to the outside of the water jacket 23. The outer ends are connected to a power supply 34 that can supply variable direct current.
  • the power supply 34 may have the function of an AC power supply as described below, and may have a function of changing frequency.
  • the electrodes 32A may be supported above the upper opening of the casting mold 2 without penetrating the side wall of the casting mold 2 so that the inner ends of the electrodes 32A are inserted into the melt M from the surface of the melt M flowing into the casting mold 2.
  • the electrodes 32A may be electrically connected to the inner casting mold 21 made of graphite or the like.
  • the number of electrodes used as the electrodes 32A may be arbitrary, and an arbitrary number of the electrodes 32A may be inserted into arbitrary electrode insertion holes of the electrode insertion holes 2a, 2a, ⁇ .
  • the lower electrode 32B is provided so that the position of the lower electrode 32B is fixed.
  • the electrode 32B is formed of a roller type electrode. That is, the lower electrode 32B includes a rotatable roller 32Ba at the end thereof.
  • the roller 32Ba comes into press contact with the outer surface of a columnar product P as a cast product (a billet or a slab) that is extruded in a solid phase state. Accordingly, as the product P extends downward, the roller 32Ba is rotated. That is, when the product P is extruded downward, the product P extends downward in Fig. 1 while coming into contact with the roller 32Ba and rotating the roller 32Ba.
  • the power supply 34 is adapted so as to be capable of controlling the amount of current flowing between the pair of electrodes 32A and 32B. Therefore, it is possible to select current where the liquid-phase melt M can be agitated most efficiently in a relationship with the magnetic lines of force ML.
  • a fixed amount of the melt M which is discharged from the tundish (melt receiving box) 1A, is input to the upper portion of the casting mold 2.
  • the casting mold 2 is cooled through the circulation of water in the water jacket 23, so that the melt M present in the casting mold 2 is rapidly cooled and solidified.
  • the melt M present in the casting mold 2 has a two-phase structure where the upper portion of the melt is liquid (liquid phase), the lower portion thereof is solid (solid phase), and the upper and lower portions of the melt are adjacent to each other at an interface IT0.
  • the melt M is formed in the shape (a columnar shape in this embodiment) corresponding to the shape of the casting mold. Accordingly, a product P as a slab or billet is continuously formed.
  • the magnetic field (magnetic lines of force ML) of the magnetic field generation device reaches the melt M, which is present in the casting mold 2, in the lateral direction.
  • the current flows to the lower electrode 32B from the upper electrodes 32A through the melt (liquid phase) M of aluminum or the like and the product (solid phase) P.
  • the current crosses the magnetic lines of force ML, which are generated from the permanent magnet type magnetic field generation device 31, substantially at right angles to the magnetic lines of force.
  • cooling capacity is increased or reduced by the water jacket 23 or the like, the solidification rate of the melt M is changed and the interface IT0 between the melt (liquid-phase) M and a product (solid-phase) P moves up and down according to this. That is, when cooling capacity is increased, the interface IT0 moves up like an interface IT1 as illustrated in Fig. 1(b) . When cooling capacity is reduced, the interface IT0 moves down like an interface IT2 as illustrated in Fig. 1(c) . Further, it is preferable that the magnetic field generation device 31 be moved up and down according to the positions of the interfaces IT0, IT1, and IT2 in order to efficiently agitate the melt M.
  • the magnetic field generation device is adapted so that the height of the magnetic field generation device 31 can be adjusted in the vertical direction according to the heights of these interfaces IT1 and IT2 as illustrated in Figs. 1(b) and 1(c) and the position of the magnetic field generation device 31 can be kept. Accordingly, it is possible to efficiently agitate the melt M as described above.
  • the double structure of the casting mold 2 may be formed so that the inner portion of the casting mold is made of a conductive material and the outer portion thereof is made of a non-conductive material.
  • at least the electrodes 32A may come into electronically contact with the conductive material that forms the inner portion of the casting mold.
  • a magnetic field generation device receiving chamber 22a may be formed in an outer member.
  • the casting mold 2 may have not a double structure but a single structure.
  • the casting mold 2 may be made of only a conductive material, and the electrodes 32A may conduct electricity to the casting mold 2.
  • the structure of the other electrode 32B may be the same as described above.
  • the casting mold 2 may be made of only a non-conductive material.
  • a magnetic field generation device receiving chamber 22a may be formed in a member having a single structure.
  • a magnetic field generation device 31A of Fig. 3(b) may be used instead of magnetic field generation device 31 of Fig. 3(a) .
  • the magnetization direction of the magnetic field generation device 31A of Fig. 3(a) is opposite to that of the magnetic field generation device 31 of Fig. 3(b) . Both the magnetic field generation devices have the same function.
  • magnetic field generation devices 31-2 and 31A-2 of Figs. 4(a) and 4(b) may be used instead of the magnetic field generation devices 31 and 31A of Figs. 3(a) and 3(b) .
  • the magnetic field generation devices 31-2 and 31A-2 of Figs. 4(a) and 4(b) are adapted so that a plurality of rod-like permanent magnets PM are fixed to the inside of a ring-shaped support (yoke) SP. These have the same function.
  • an electrode which includes the roller 32Ba at the end thereof, has been described as the lower electrode 32B in the above-mentioned embodiment.
  • the lower electrode does not need to necessarily include the roller 32Ba.
  • the electrode 32B only has to conduct electricity to the product P and may employ various structures.
  • an elastic member having a predetermined length is used as the electrode 32B and is bent, for example, so as to be convex upward or downward in Fig. 1 , and the end of the elastic member comes into press contact with the cast product P by the force of restitution. In this state, the cast product P may be allowed to extend downward.
  • melt M that is not yet solidified is agitated to give movement, vibration, and the like to the melt M, so that a degassing effect and the uniformization and refinement of the structure are achieved.
  • the magnetic field generation device 31 is adapted so as to be capable of being adjusted in the vertical direction in the embodiment of the invention, it is possible to obtain a high-quality product P by reliably agitating the melt M.
  • This is one of the characteristics of the invention as described above, and an idea, in which a magnetic field generation device 31 provided outside the casting mold is moved up and down in a device that is apt to be high temperature and large in size and hardly has an empty space as in the embodiment of the invention, itself is an idea that is not accustomed to those skilled in the art. Accordingly, a technique of the invention, in which a magnetic field generation device is received in a casting mold and can be adjusted in the vertical direction, is a technical idea that is peculiar to the inventor.
  • the magnetic field generation device 31 is formed in the embodiment of the invention so that a plurality of magnetic poles are disposed at the positions surrounding the melt M or a ring-shaped magnet surrounding the melt M is disposed, it is possible to efficiently agitate all the melt M with an electromagnetic force that is generated according to Fleming's rule by magnetic lines of force and current. Accordingly, it is possible to obtain a product P as a high-quality product. That is, in the embodiment of the invention, it is possible to efficiently agitate the melt M by making the best use of an electromagnetic force that is generated according to Fleming's rule.
  • the axis of the rotation of the melt M which is caused by this agitating of the melt, is an axis parallel to the center axis of the product P in Fig. 1(a) . Accordingly, it is possible to obtain a high-quality product as a product P by making the rotational drive of the melt M reliable.
  • melt M is agitated with an electromagnetic force that is generated according to Fleming's rule and is agitated by the cooperation between small current flowing in the melt M and a magnetic field generated from the magnetic field generation device 31. Accordingly, it is possible to obtain a device that stably and continuously expects reliable agitation unlike melting and agitation performed using the intermittent flow of large current according to the principle of arc welding or the like and has low noise and high durability.
  • the electromagnetic agitating device in the related art can cope with a case where several slabs or billets are produced at one time.
  • the electromagnetic agitator in the related art cannot cope with this demand.
  • the magnetic field generation device is used as the magnetic field generation device in the device of the invention. For this reason, it is possible to make the device very compact in comparison with the electromagnetic agitator that is supplied with large current. Accordingly, it is possible to sufficiently realize a molding device for a mass production facility. Further, since the magnetic field generation device is permanent magnet type, it is possible to obtain a device having effects, such as no heat generation, power saving, energy saving, and less maintenance, as a magnetic field generation device.
  • Fig. 5 illustrates another embodiment of the invention.
  • This embodiment is different from the embodiment of Fig. 1(a) in the structure of a casting mold 2A.
  • Other structures are substantially the same as Fig. 1(a) . Accordingly, the detailed description thereof will not be repeated here.
  • the casting mold 2A of this embodiment includes a substantially cylindrical casting mold body 2A1.
  • the casting mold body 2A1 includes a circumferential groove 2A1(a) that is formed on the inner peripheral surface thereof.
  • An insulating film 2A2 is formed on the inner surface (the peripheral surface and the bottoms) of this groove, and an embedded layer 2A3 is formed by embedding the same conductive material as the casting mold body 2A1 on the insulating film 2A2.
  • An insulating layer portion is formed of the insulating film 2A2 and the embedded layer 2A3. The insulating layer portion is formed on a part of the inner surface of the casting mold, and functions as a portion that does not allow the flow of current from the casting mold.
  • This insulating layer portion is formed on a slightly lower portion of the inner surface of the casting mold body 2A1.
  • a terminal 2A4 is provided on the outer periphery of the casting mold body 2A1. Power can be supplied to the casting mold 2A from the power supply 34 through this terminal 2A4.
  • Fig. 6 illustrates still another embodiment.
  • This embodiment is a modification of the embodiment of Fig. 1(a) .
  • This embodiment is different from the embodiment of Fig. 1(a) in the disposition of the upper electrodes 32A of Fig. 1(a) . That is, in this embodiment, one electrode 32A0 is disposed or a plurality of electrodes 32A0 are disposed annularly, these electrodes 32A0 are supported by arbitrary units other than the casting mold 2A and the like (the casting mold 2A and the water jacket 23), and a lower end portion of each of the electrodes 32A0 is inserted into the melt M. Accordingly, it is possible to adjust the length of the lower end portion, which is inserted into the melt M, of the electrode 32A0 with large degree of freedom regardless of the casting mold 2A and the like.
  • a normal mold may be used as the casting mold 2A or the like, and electrode insertion holes 2a for electrodes 32A1 do not need to be formed in the casting mold 2A or the like. Therefore, it is also possible to prevent the increase in the manufacturing costs of these.
  • Fig. 7 illustrates yet another embodiment.
  • This embodiment may be regarded as a modified example of the embodiment of Fig. 6 .
  • Fig. 7 The embodiment of Fig. 7 is assumed as a device that can be operated when melt M is poured into a casting mold 2A, which is provided on the lower side, from a tundish (melt receiving box) 1A, which is provided on the upper side, as continuous melt with no interruption. That is, it is assumed that the melt M present in the tundish (melt receiving box) 1A and the melt M present in the casting mold 2A are integrally connected to each other.
  • the electrodes 32A0 are inserted into the melt M present in the casting mold 2.
  • an electrode 32A1 is supported by arbitrary units so as to be inserted into the melt M present in the tundish (melt receiving box) 1A on the premise of the above-mentioned case. Accordingly, it is possible to obtain the same advantage as the above-mentioned embodiment of Fig. 6 .
  • Figs. 8(a) to 8(d) , Figs. 9(a) to 9(c) , and Fig. 10 illustrate other embodiments of the invention, respectively.
  • a water jacket for cooling does not need to be separately provided
  • a water flow chamber 22a(2) which functions as both a cooling chamber and a magnetic field generation device receiving chamber, is formed in the side wall of a casting mold 2, that is, the side wall of the outer casting mold 22, and a magnetic field generation device 31 as a permanent magnet is received in the water flow chamber 22a(2) so that the position of the magnetic field generation device can be adjusted in the vertical direction.
  • a magnetic field generation device receiving space (magnetic field generation device receiving chamber) 22a(2) illustrated in Fig. 8(c) may be divided so as to receive a plurality of permanent magnet pieces 31A, which are illustrated in Fig. 8(d) and disposed at a predetermined interval, respectively.
  • the magnetic field generation device receiving space may be formed of a plurality of partial magnetic field generation device receiving chambers having an arc-shaped cross-section.
  • the outer casting mold 22 includes a water flow chamber 22a(2) that is opened downward and has a ring-shaped cross-section, and the water flow chamber 22a(2) is hermetically-sealed by a lid 22B(1).
  • Fig. 8(b) is a view illustrating the inner casting mold 21 and the outer casting mold 22 taken along line VIII(b) - VIII(b) from below when the lid 22B(1) is removed. This lid 22B(1) forms a part of the casting mold 2.
  • a magnetic field generation device 31 which is formed of a plurality of permanent magnet pieces 31A ( Fig. 8(c) ) having an arc-shaped cross-section, is received in the ring-shaped water flow chamber 22a(2) serving as a magnetic field generation device receiving space (receiving chamber) so as to be capable of being adjusted in the vertical direction. That is, the water flow chamber (cooling chamber) 22a(2) functions as both a cooling water flow chamber and a magnetic field generation device receiving chamber.
  • a plan view of these permanent magnet pieces 31A is illustrated in Fig. 8(d) .
  • the inner portion of each of the permanent magnet pieces 31A is magnetized to an N pole and the outer portion thereof is magnetized to an S pole.
  • the magnetization may be contrary to this. That is, the magnetic field generation device 31 is provided so that the height of the magnetic field generation device can be adjusted in the water flow chamber 22a(2) by arbitrary units (not illustrated). Accordingly, it is possible to more efficiently agitate the melt M by adjusting the height of the magnetic field generation device so as to correspond to liquid-phase melt M as described above.
  • the lower opening of the water flow chamber 22a(2) is closed by the above-mentioned ring-shaped lid 22B.
  • a plan view of the lid 22B is illustrated in Fig. 8(e) .
  • a plurality of discharge channels 22B(1) for cooling water are formed in the lid 22B(1).
  • the plurality of discharge channels 22B(1) include a plurality of inlets 22B(1)a1 that are opened to the upper surface of the lid 22B, and include outlets 22B(1)a2 on the peripheral surface of the lid 22B.
  • cooling water present in the water flow chamber 22a(2) enters from the plurality of inlets 22B(1)a1, flows out of the outlets 22B(1)a2, and is jetted to the outer periphery of the product P to cool the product P. That is, cooling water enters the water flow chamber 22a(2) from inlets (not illustrated), is circulated in the water flow chamber while cooling the product, and is discharged while being jetted to the outside from the discharge channels 22B(1).
  • the magnetic field generation device 31 has been formed of the plurality of permanent magnet pieces 31A in the above-mentioned embodiment of Figs. 8(a) to 8(e) .
  • the magnetic field generation device may be integrally formed as in Fig. 3(a) .
  • the water flow chamber 22a(2) serving as the magnetic field generation device receiving space is formed in a circumferential shape as understood from Fig. 8(b) .
  • the water flow chamber is not limited to this shape, and may be formed of a plurality of cell chambers that are divided in the circumferential direction and have an arc-shaped cross-section. It is preferable that cooling water can flow in each cell chamber and the permanent magnet piece 31A be received in each cell chamber so as to be capable of moving up and down.
  • the magnetic field generation device 31 is not provided outside the casting mold 2, and a cavity (water flow chamber 22a(2)) is formed in the casting mold 2 (outer casting mold 22) and the magnetic field generation device 31 is received in the cavity. Accordingly, it is possible to obtain the following characteristics.
  • the magnetic field generation device 31 is a built-in type when the device is regarded as a device manufacturing the same product P although being the same as described above, the size of the device is reduced as a whole. Accordingly, it is possible to install the device even at a narrow place. As a result, flexibility is obtained in the usefulness of the device.
  • the magnetic field generation device 31 be close to the melt M as much as possible in order to reliably apply a magnetic field to the melt M, and this is realized in a built-in type.
  • the magnetic field generation device 31 When the magnetic field generation device 31 is provided outside, the influence of a magnetic field on various measuring instruments such as temperature sensors should be considered. However, since the influence thereof is reduced in a built-in type, a built-in type is more advantageous in measurement. That is, when a product P, such as a slab or a billet, is manufactured, the measurement, management, and the like of temperature in several positions are very important to maintain the quality of a product. This embodiment is very advantageous in the measurement of temperature and the like.
  • the size, weight, and volume of a device may be reduced when the same magnetic field is applied to the melt M. Accordingly, the device is easy to use. That is, since the respective components of this device are consumables, the respective components of this device need to be replaced whenever a predetermined operation time has passed. However, since the magnetic field generation device 31 is small and light, a work for replacing the magnetic field generation device and the like are very easily performed.
  • a work at the device of this embodiment is a work that is performed at a so-called high temperature of about 700°C, the work is very dangerous for a worker.
  • a magnetic field generation device which is small and of which the intensity of a magnetic field is low, may be used as the magnetic field generation device 31.
  • a tool which is used for the adjustment, maintenance, and the like of the device, is generally a ferromagnetic body made of iron and safety shoes and the like are also made of iron.
  • a magnetic field of the magnetic field generation device 31 which is emitted by the outside, is reduced a little, the safety of a security officer, a worker, a measuring person, and the like is ensured.
  • Figs. 9(a) to 9(c) illustrate a device for manufacturing a slab.
  • the basic technical idea of the device is the same as described above except that a billet has a circular shape and a slab has a rectangular shape. Accordingly, the same members are denoted by the same reference numerals and the description thereof will not be repeated.
  • Fig. 9(b) is a cross-sectional view taken along line IX(b) - IX(b) of Fig. 9(a)
  • Fig. 9(c) is a plan view of the magnetic field generation device 31.
  • the magnetic field generation device 31 uses four permanent magnet pieces 31A and forms two pairs facing each other, but may use any one pair.
  • Fig. 10 illustrates a modified example of Fig. 9(a) .
  • a pair of electrodes 32A and 32B is used while being inserted into melt M.
  • the inventor confirmed by an experiment that the melt M is agitated even though the electrodes 32A and 32B are used in this way. That is, even though the pair of electrodes 32A and 32B is employed as illustrated in Fig. 10 , the magnetic lines of force generated from a magnetic field generation device 31 and current flowing between the pair of electrodes 32A and 32B flow in various paths in the melt M and generate an electromagnetic force according to Fleming's rule.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP12848633.9A 2011-11-10 2012-02-02 Molding device for continuous casting having stirring device Active EP2650063B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011246666A JP5431438B2 (ja) 2011-11-10 2011-11-10 攪拌装置付き連続鋳造用鋳型装置
PCT/JP2012/052412 WO2013069314A1 (ja) 2011-11-10 2012-02-02 攪拌装置付き連続鋳造用鋳型装置

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EP2650063A1 EP2650063A1 (en) 2013-10-16
EP2650063A4 EP2650063A4 (en) 2015-04-22
EP2650063B1 true EP2650063B1 (en) 2018-06-27

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US (3) US20140069602A1 (zh)
EP (1) EP2650063B1 (zh)
JP (1) JP5431438B2 (zh)
KR (1) KR101562876B1 (zh)
CN (1) CN103459064B (zh)
AU (2) AU2012337223B2 (zh)
CA (1) CA2829183C (zh)
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JP6526769B1 (ja) * 2017-11-15 2019-06-05 高橋 謙三 金属の溶湯からの連続式不純物除去装置及び連続式不純物除去方法
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Publication number Publication date
JP5431438B2 (ja) 2014-03-05
AU2016201435A1 (en) 2016-03-24
US20150343523A1 (en) 2015-12-03
WO2013069314A1 (ja) 2013-05-16
EP2650063A4 (en) 2015-04-22
CN103459064A (zh) 2013-12-18
US20140069602A1 (en) 2014-03-13
AU2016201435B2 (en) 2017-11-23
US20180345359A1 (en) 2018-12-06
EP2650063A1 (en) 2013-10-16
JP2013103229A (ja) 2013-05-30
KR101562876B1 (ko) 2015-10-26
CA2829183A1 (en) 2013-05-16
NZ612696A (en) 2016-10-28
AU2012337223A1 (en) 2013-07-18
CA2829183C (en) 2016-06-07
KR20130100210A (ko) 2013-09-09
CN103459064B (zh) 2016-01-13
AU2012337223B2 (en) 2016-03-17

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