NZ612696B2 - Molding device for continuous casting equipped with agitator - Google Patents

Abstract

Disclosed is a mould device for continuous casting having a stirring device. The mould receives a supply of a melt (M) in a liquid state from an inlet into a casting space. A moulded product (P) in a solid state, due to cooling in the casting space, is extracted from an outlet. A stirring device is provided in communication with the mould. The stirring device comprises an electrode unit and a magnetic field generating device. The electrode unit has at least a first electrode (32A1) and second electrode (32B) that creates a current flow in the liquid state melt within the casting space. The magnetic field generating device comprises a permanent magnet (31) for creating a magnetic field within the liquid state melt. The stirring device is arranged such that the magnetic field generating device is accommodated within a chamber (22a) in the side wall (22) of the mould. The magnetic field passes through part of the side wall of the mould and travels into the mould space so that the magnetic field causes a force horizontally toward the centre of the casting space. provided in communication with the mould. The stirring device comprises an electrode unit and a magnetic field generating device. The electrode unit has at least a first electrode (32A1) and second electrode (32B) that creates a current flow in the liquid state melt within the casting space. The magnetic field generating device comprises a permanent magnet (31) for creating a magnetic field within the liquid state melt. The stirring device is arranged such that the magnetic field generating device is accommodated within a chamber (22a) in the side wall (22) of the mould. The magnetic field passes through part of the side wall of the mould and travels into the mould space so that the magnetic field causes a force horizontally toward the centre of the casting space.

Description

MOLDING DEVICE FOR CONTINUOUS CASTING EQUIPPED WITH AGITATOR Technical Field The present invention relates to a molding device for continuous casting, which is equipped with an agitator, of continuous casting equipment that produces a , 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.

Background Art In the past, a melt agitating method to be described below has been ed in a casting mold for continuous casting. That is, for the ement 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. However, since the electromagnetic coil is ed at the position close to high-temperature melt, the cooling of the omagnetic coil and troublesome maintenance are needed and large power consumption is obviously needed. In addition, 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 , there are various problems in that the device itself cannot but become expensive, and the like.

Citation List Patent Literature

[0003] Patent Literature 1: JP 9-99344 A Summary of Invention Technical Problem The ion has been made to attempt to solve the above-mentioned problems, and an object of the invention is to provide a molding device for continuous casting equipped with an or that reduces the amount of generated heat, is easy to carry out maintenance, is inexpensive, and is easy to use in practice.

Alternatively, it is an object of the invention to at least provide the public with a useful .

A molding device for uous casting equipped with an or ing to an embodiment of the present invention 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 rical 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 -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 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 magnetic field generation device having a permanent magnet that applies a magnetic field to the liquid-phase melt. The magnetic field generation device is received in the magnetic field tion 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 g mold and reach the casting space, and applies lateral [followed by page 2a] magnetic lines of force, which cross the current, to the melt, wherein the magnetic field generation device receiving chamber functions as a cooling water.

Unless the t clearly requires otherwise, throughout the description and claims the terms “comprise”, “comprising” and the like are to be construed in an ive sense, as opposed to an exclusive or exhaustive sense. That is, in the sense of “including, but not limited to”.

Brief Description of Drawings [followed by page 3] Fig. 1(a) is a view illustrating the entire structure of an embodiment of the invention, and Figs. 1(b) and 1(c) are explanatory views illustrating the operation thereof.

Fig. 2(a) is an explanatory plan view taken along line II(a) - II(a) of Fig. 1 and Fig. 2(b) is an explanatory view illustrating the bottom of an outer casting mold.

Fig. 3(a) is an explanatory plan view of a magnetic field generation device 31 of an agitator 3, and Fig. 3(b) is an explanatory plan view of a modified example thereof.

Fig. 4(a) is a plan view of another ed example of the magnetic field generation device 31 of the agitator 3, and Fig. 4(b) is an explanatory plan view of a modified e thereof.

Fig. 5 is a view illustrating the entire structure of another embodiment of the ion.

Fig. 6 is a view illustrating the entire structure of another ment of the invention.

Fig. 7 is a view illustrating the entire structure of still r ment of the invention.

Fig. 8(a) is a view rating the entire structure of yet another embodiment of the invention, Fig. 8(b) is a cross—sectional view taken along line VIII(b) - VIII(b) of Fig. 8(a), Fig. 8(c) is a cross-sectional view taken along line VIII(c) — VIII(c) of Fig. 8(a), Fig. 8(d) is an explanatory plan view of a magnetic field generation device, and Fig. 8€ is an explanatory plan view of a lid.

Fig. 9(a) is a view illustrating the entire ure of still another embodiment of the invention, Fig. 9(b) is a cross—sectional view taken along line IX(b) — IX(b) of Fig. 9(a), and Fig. 9(c) is an explanatory plan view of a magnetic field generation device. 3O Fig. 10 is a view illustrating the entire structure of yet another embodiment of the invention.

Description of Embodiments For deeper understanding of an embodiment of the invention, an electromagnetic agitator, which uses electricity as power, of uous casting equipment in the related art will be described briefly.

In the related art, a fixed amount of 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 ed 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 emperature melt comes into contact with the casting mold.

Since the melt, which is positioned at the central portion of the casting mold, is distant from the wall of the casting mold that 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. For this reason, 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 nt to each other with an interface interposed therebetween. Further, generally, if melt is solidified too rapidly, gas remains in the cast product ct) having been d into a solid and causes the quality of the product to orate. 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. r, when such an electromagnetic agitator is used, there are various difficulties as described above. 3O [0010] Accordingly, 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.

[0011] An embodiment of the invention will be described in more detail below.

The entire structure of an embodiment of the invention is illustrated in Fig. 1(a). Fig. 2(a) is an explanatory plan view taken along line II(a) - II(a) of Fig. 1(a), and mainly rates a part of an agitator 3 and a casting mold 2, and Fig. 3(a) is an explanatory plan view of the magnetic field generation device 31 of the agitator

[0013] As understood from Fig. 1(a), a device according to an embodiment of the invention broadly es 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 es the melt M present in the g mold 2. A central n 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.

[0014] The melt supply unit 1 includes a h (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 18 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. For this purpose, 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 tory material), such as um or copper.

As described in detail below, the ic field generation device 31 is assembled so as to be received within the side wall of the outer casting mold 22. ile, 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 ponding 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.

In addition, 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 rd 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 ned in the casting mold 2, there is no concern that the melt M will leak to the outside.

[0018] As described above, briefly, 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 328.

In particular, as understood from Fig. 3(a), the magnetic field generation device 31 is formed in the shape of a ring (in a frame . The entire inner peripheral portion of the ic field generation device may be magnetized to an N pole, and the entire outer eral 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.

[0020] , As understood from the following description, 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 y described above, particularly, as understood from Fig. 1(a), the magnetic field generation device 31 is led in the outer casting mold 22.

In more , as understood from Fig. 1(a), the outer casting mold 22 includes a magnetic field generation device receiving chamber 22a which is formed in the side wall f and has a ring-shaped cross—section and of which a lower portion forms a release port. The magnetic field generation device receiving 3O 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. In ular, as understood from Fig. 1(a), 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 tion device 31 is provided so that the height of the magnetic field generation device can be adjusted in the magnetic field tion device receiving chamber 22a by desired units (not illustrated). ingly, 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 228. The lid 228 may be formed so as to include discharge ls ZZB (1) for discharging cooling water to the outside such as a lid 228 of Fig. 8(a) to be described below.

[0022] As described above, the four portions of the magnetic field tion 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 e 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 ntally 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 3O that a plurality of magnetic poles are disposed at a plurality of ons‘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 ing all the melt M with an electromagnetic force that is generated according to Fleming's rule by magnetic lines of force and t 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. Further, as described above, the magnetic field generation device 31 does need to be formed of a ring—shaped single body, and may be divided into a ity of magnet bodies (magnet pieces), of which the number is arbitrary, as illustrated in Fig. 8(d).

In Fig. 1(a), current flows between the pair of electrodes 32A and 328 through the melt M and a cast product (product) P.

One ode 32A may be used, but a plurality of odes 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 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 ating 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 melt M flowing into the casting mold 2. The electrodes 32A may be electrically connected to the inner g mold 21 made of te or the like. 3O [0024] The number of electrodes used as the electrodes 32A be arbitrary, and an ary number of the electrodes 32A may be inserted into arbitrary electrode insertion holes of the electrode insertion holes 2a, 2a,

[0025] In Fig. 1(a), the lower ode 328 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 .3ZBa 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 328a 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 328a.

Accordingly, when a voltage is applied n the pair of electrodes 32A and 328 from the power supply 34, current flows between the pair of electrodes 32A and 328 through the melt M and the product P. As described above, the power supply 34 is adapted so as to be e of controlling the amount of current flowing between the pair of electrodes 32A and 328.

Therefore, it is le to select current where the -phase melt M can be agitated most efficiently in a relationship with the magnetic lines of force ML.

Next, the ion of the device having the above-mentioned structure will be described.

In Fig. 1(a), 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 h the circulation of water in the water jacket 23, so that the melt M present in the g mold 2 is rapidly cooled and solidified. 3O However, the melt M t in the casting mold 2 has a two-phase structure where the upper portion of the melt is liquid (liquid , 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 ITO. When passing through the casting mold 2, 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.

Further, since the ent magnet type magnetic field generation device 31 is received in the side wall of the casting mold 2 as understood from Fig. 1(a) and the like, 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. In this state, when direct current is supplied to the lower electrode 328 from the upper electrodes 32A by the power supply 34, the current flows to the lower electrode 328 from the upper odes 32A through the melt (liquid phase) M of aluminum or the like and the product (solid phase) P. At this time, 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. ingly, rotation occurs in the liquid—phase melt M in accordance with Fleming's left-hand rule. The melt M is agitated in this way, so that impurities, gas, and the like contained in the melt M float and so-called degassing is actively performed.

Accordingly, the quality of the product (a slab or a ) P is improved.

Now, 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 ITO between the melt (liquid-phase) M and a t (solid-phase) P moves up and down according to this.

That is, when cooling capacity is sed, the interface ITO moves up like an interface IT1 as illustrated in Fig. 1(b). When cooling capacity is reduced, the interface 1T0 moves down like an interface IT2 as illustrated in Fig. 1(c). r, it is preferable that the magnetic field generation device 31 be moved up and down according to the positions of the aces ITO, IT1, and IT2 in order to ently agitate the melt M. Accordingly, it is possible to obtain a product P as a high—quality product by reliably and efficiently agitating the melt M. For this e, 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 ently agitate the melt M as described above.

On the contrary, the double structure of the casting mold 2 may be formed so that the inner portion of the casting mold is made of a tive material and the outer portion thereof is made of a non-conductive material. In this case, at least the electrodes 32A may come into electronically contact with the conductive material that forms the inner portion of the casting mold. Even in this case, a magnetic field generation device receiving r 22a may be formed in an outer member.

[0032] Further, the g mold 2 may have not a double structure but a single structure. In this case, 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.

On the contrary, the casting mold 2 may be made of only non-conductive material. In this case, it is necessary to make the electrodes 32A conduct electricity to the melt M present in the g mold 2 by making the electrodes 32A ate into the casting mold 2 as illustrated in Fig. 1(a).

In these cases, obviously, a ic field generation device receiving chamber 22a may be formed in a member having a single 3O 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 ic 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.

Further, 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 s PM are fixed to the inside of a ring-shaped support (yoke) SP.

These have the same function.

[0037] Furthermore, an electrode, which es the roller 328a at the end thereof, has been described as the lower ode 328 the above-mentioned ment. However, the lower electrode does not need to necessarily include the roller 328a. Even though a product P is continuously extruded, the electrode 328 only has to conduct electricity to the product P and may employ various structures. For example, an elastic member having a predetermined length is used as the electrode 328 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 t with the cast product P by the force of restitution. In this state, the cast product P may be allowed to extend downward.

According to the above-mentioned embodiment of the invention, it is possible to obtain the following s.

In the embodiment of the invention, melt M that is not yet solidified is agitated to give movement, ion, and the like to the melt M, so that a degassing effect and the uniformization and 3O refinement of the structure are achieved.

In more detail, since the magnetic field generation device 31 is adapted so as to be capable of being ed in the vertical direction in the embodiment of the invention, it is possible to obtain a high-quality product P by reliably ing the melt M. This is one of the characteristics of the invention as described above, and an idea, in which a ic 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.

Further, since 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 ed, it is possible to efficiently agitate all the melt M with an electromagnetic force that is generated according to g'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. In addition, the axis of the on of the melt M, which is caused by this. agitating of the melt, is an axis parallel to the center axis of the t P in Fig. 1(a).

Accordingly, it is possible to obtain a high-quality t as a product P by making the rotational drive of the melt M reliable.

[0042] Moreover, in the embodiment of the invention, melt M is agitated with an electromagnetic force that is generated ing to Fleming's rule and is agitated by the cooperation between small current flowing in the melt M and a ic field generated from 3O the magnetic field generation device 31. Accordingly, it is le to obtain a device that stably and continuously s 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.

[0043] It is obvious that the above—mentioned effects are obtained from all embodiments to be described below.

Meanwhile, direct current has been supplied between the electrodes 32A and 32B in the above description, but alternate current having a low frequency of about 1 to 5 Hz may be supplied from the power supply 34. In this case, the melt M does not rotate but repeatedly vibrates according to the cycle thereof in the relationship with a magnetic field that is generated from the magnetic field generation device 31. Impurities are removed from the melt M even by the vibration. This modified example may be applied to all ments to be described below. In this case, it is s that a power supply having a function of changing frequency is employed as the power supply 34.

Further, the realization of mass production facilities is tly required in the industry. It is essential to realize a casting mold that is as small as possible when mass production is considered.

Here, the electromagnetic agitating device in the related art can cope with a case where several slabs or billets are produced at one time. r, at present, there is a demand for the production of billets of which the number exceeds 100. The electromagnetic agitator in the related art cannot cope with this demand.

However, ent magnets are 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 or that is supplied with large t. Accordingly, it is possible to iently realize a molding device for a mass production facility. Further, since the ic 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.

More current is ed to this -phase melt M to generate a larger electromagnetic force so that the melt M is rotationally driven.

This embodiment is different from the embodiment of Fig. 1(a) in the structure of a casting mold 2A. Other ures are substantially the same as Fig. 1(a). Accordingly, the detailed description thereof will not be repeated here.

That is, 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 eral surface and the bottoms) of this groove, and an embedded layer 2A3 is formed by ing 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.

[0052] This insulating layer portion is formed on a slightly lower portion of the inner surface of the casting mold body 2A1.

Accordingly, current is hardly allowed to flow to the cast product P from the insulating layer portion of the g mold 3O body 2A1, that is, a portion adjacent to the cast product P.

In addition, a terminal 2A4 is ed on the outer periphery of the casting mold body 2A1. Power can be supplied to the casting mold 2A from the power supply 34 h this terminal 2A4.

When a voltage is applied between the terminal 2A4 and the electrode 328 by the power supply 34 in the device having this structure, current flows in the casting mold body 2A1, the melt M, and the cast product P. Since current does not flow in the insulating film 2A2 and the embedded layer 2A3 at this time, larger current flows in the melt M. Accordingly, a larger electromagnetic force, which allows the melt M to be agitated, is ed.

Fig. 6 illustrates still another embodiment.

[0056] 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 odes 32A0 are disposed rly, 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. er, obviously, a normal mold may be used as the g mold 2A or the like, and ode 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 se in the manufacturing costs of these. 3O Other structures are the same as the embodiment of Fig. 1(a).

Fig. 7 illustrates yet another embodiment.

This embodiment may be regarded as a modified example of the embodiment of Fig. 6.

The ment 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 ing box) 1A and the melt M present in the casting mold 2A are integrally connected to each other.

In Fig. 6, the electrodes 32A0 are inserted into the melt M present in the g mold 2. However, in Fig. 7, 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. In addition, it is possible to set and adjust a distance between the tundish (melt receiving box) 1A and the casting mold 2A or the like regardless of the ode 32A1.

Other structures are substantially the same as Fig. 6.

Figs. 8(a) to 8(d), Figs. 9(a) to 9(c), and Fig. 10 illustrate other embodiments of the invention, respectively.

The same members of these embodiments as the members of the above-mentioned embodiment are denoted by the same reference numerals and the description thereof will not be repeated. 3O In these embodiments, a water jacket for cooling does not need to be separately provided, a water flow chamber , which ons 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 g 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.

Meanwhile, 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. For example, 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.

First, a device of cturing a billet of the embodiment illustrated in Figs. 8(a) to 8(e) will be bed.

[0069] That is, as understood from Fig. 8(a), 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 228(1) is removed. This lid 228(1) forms a part of the casting mold 2.

As understood from Fig. 8(a), a magnetic field tion device 31, which is formed of a plurality of ent magnet pieces 31A (Fig. 8(c)) having an arc-shaped cross-section, is received in the ring—shaped water flow r 22a(2) serving a magnetic field generation device receiving space (receiving 3O chamber) so as to be capable of being adjusted in the vertical ion. That is, the water flow chamber (cooling chamber) 22a(2) ons as both a g 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 ized to an N pole and the outer portion thereof is magnetized to an S pole. The magnetization may be ry 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 -phase melt M as described above.

The lower g of the water flow chamber 22a(2) is closed by the above-mentioned ring-shaped lid 228. A plan view of the lid 228 is illustrated in Fig. 8(e). As tood from Figs. 8(e) and 8(a), a plurality of discharge channels 228(1) for cooling water are formed in the lid 228(1). As understood from Figs. 8(a) and 8(e), the ity of discharge channels 228(1) include a plurality of inlets 228(1)a1 that are opened to the upper surface of the lid 228, and include outlets 228(1)a2 on the peripheral surface of the lid 228. Accordingly, cooling water present in the water flow chamber 22a(2) enters from the plurality of inlets 228(1)a1, flows out of the outlets 228(1)a2, and is jetted to the outer periphery of the t P to cool the product P. That is, cooling water enters the water flow r 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 228(1).

Since the operation of the above-mentioned device of Figs. 8(a) to 8(e) is the same as that of the above—mentioned embodiment, the description f will not be repeated. 3O [0073] Meanwhile, 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). However, it is obvious that the magnetic field generation device may be integrally formed as in Fig. 3(a). Further, the water flow chamber 22a(2) serving as the magnetic field tion device receiving space is formed in a circumferential shape as understood from Fig. 8(b). However, 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 each cell chamber so as to be capable of moving up and down.

In the device of Figs. 8(a) to 8(e), 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 ed in the cavity. Accordingly, it is possible to obtain the following teristics.

[0075] - A permanent magnet, which is small and has a small capacity, may be used as the magnetic field generation device 31.

That is, if the magnetic field generation device 31 is provided outside the casting mold, it is inevitable that’a distance between the magnetic field generation device 31 and the melt M is slightly increased. However, since the magnetic field generation device is built in the casting mold 2 in this ment, the distance between the magnetic field generation device 31 and the melt M is reduced. Accordingly, a permanent magnet, which is small and has a small capacity, may be used to obtain the same agitating mance.

- It is possible to significantly e a working ty.

That is, when this device is operated, a plurality of inspectors should be positioned around the device to m various kinds of measurement, nondestructive inspection, and the like and should perform such the measurement and the like for the check of a product P. However, in the case of the magnetic field generation device that is provided outside, the se in size and volume cannot be avoided and it cannot be denied that it is difficult to m such the measurement since a strong magnetic field is generated. However, since the ic field generation device 31 is provided in the casting mold 2 in this embodiment, a volume is not increased and the intensity of a ic field emitted to the outside is reduced. For this reason, it is easy to perform various kinds of measurement and the like.

— It is possible to significantly improve productivity.

That is, it is possible to reduce time required for the above-mentioned measurement and the like. As a result, it is le to increase the manufacturing rate of a product P per unit time.

- It is le to reduce size.

That is, since the magnetic field generation device 31 is a in type, it is possible to provide a device that is small as a whole as much as that.

— It is possible to save a space of an installation location.

That is, since the magnetic field tion device 31 is a '20 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 le to install the device even at a narrow place. As a result, flexibility is obtained in the usefulness of the device.

The above—mentioned effects will be described below from a different standpoint.

When a product P is manufactured by this device, for example, five or six workers gather around the device and should perform high-density works (works for monitoring and preventing the e of melt, works for monitoring and preventing the jet of melt, and the like) in a short time. When these works are performed by a plurality of workers, a working property is good in the built—in type device of this embodiment as compared to a case where the magnetic field generation device 31 is provided outside so as to de. That is, since the external appearance of the device has the same dimensions as the dimensions of a device that does not include the magnetic field generation device 31 that is a device in the related art, the device of this embodiment is very easy to use at the work site.

Further, it is preferable that 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.

When the magnetic field generation device 31 is ed outside, the influence of a magnetic field on various ing instruments such as ature sensors should be considered.

However, since the influence thereof is d 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. ' If a built-in type magnetic field tion device as in this embodiment is used instead of the magnetic field generation device provided outside, the size, , 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 3O tive components of this device need to be replaced whenever a predetermined operation time has passed. However, since the magnetic field tion device 31 is small and light, a work for replacing the magnetic field generation device and the like are very easily performed.

[0085] Since 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. However, a magnetic field generation device, which is small and of which the intensity of a magnetic field is low, may be used as the ic field generation device 31. Further, a tool, which is used for the adjustment, nance, and the like of the device, is lly a ferromagnetic body made of iron and safety shoes and the like are also made of iron. However, if a magnetic field of the magnetic field generation device 31, which is d by the outside, is reduced a little, the safety of a security officer, a worker, a measuring person, and the like is ensured.

It is obvious that the effects described above with reference to Figs. 8(a) to 8(e) are ned in not only the device of Fig. 1 and the like but also devices for manufacturing a slab that are to be described below and illustrated in Figs. 9(a) to 9(c) and 10.

Figs. 9(a) to 9(c) illustrate a device for manufacturing a slab.

However, 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.

A difference will be described below.

The weight of a slab as a product P is very heavy. For this reason, a billet can be pulled in the horizontal direction, but a slab as a product P is not obtained unless taken out in the al 3O direction. For this reason, a pedestal 51 is prepared, and a product P is taken out while riding the pedestal 51 and being gradually pulled downward. A lower electrode 32B is embedded in the al 51. A magnetic field generation device 31 is illustrated in Figs. 9(b) and 9(c). Fig. 9(b) is a cross-sectional view taken along line IX(b) - IX(b) of Fig. 9(a), and Fig. 9(c) is a plan view of the magnetic field generation device 31. Here, 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).

In Fig. 10, a pair of electrodes 32A and 328 is used while being ed into melt M. The inventor confirmed by an experiment that the melt M is agitated even though the electrodes 32A and 328 are used in this way. That is, even though the pair of electrodes 32A and 323 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 odes 32A and 328 flow in various paths in the melt M and generate an electromagnetic force according to Fleming's rule.

Claims (20)

1. A molding device for continuous casting equipped with an 5 agitator which receives liquid-phase melt of a conductive material and from which a solid-phase cast t is taken out through the cooling of the melt, the molding device comprising: a casting mold including a casting space that includes an inlet and an outlet at a central portion of a cylindrical side wall and 10 a magnetic field generation device receiving chamber that is formed in the side wall and is positioned outside the casting space, the casting mold ing the liquid-phase melt from the inlet into the casting space and discharging the phase cast product from the outlet through the cooling in the casting space; and 15 an agitator provided so as to correspond to the casting mold, the agitator ing 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 magnetic field generation device having apermanent magnet that applies a magnetic field to 20 the -phase melt, wherein the magnetic field tion 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 l direction, makes the magnetic lines of force pass through 25 a part of the side wall of the casting mold and reach the g space, and applies lateral magnetic lines of force, which cross the current, to the melt, wherein the magnetic field generation device receiving chamber functions as a cooling chamber that allows the flow of 30 cooling water.

2. A molding device ing to claim 1, wherein the magnetic field generation device receiving chamber includes an opening that is formed in the side wall of the 5 casting mold so as to be opened downward, wherein the opening of the magnetic field generation device receiving chamber is closed by a lid.

3. A molding device for continuous casting ed with an 10 agitator 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 comprising: a casting mold ing a g space that includes an inlet and an outlet at a central portion of a cylindrical side wall and 15 a magnetic field generation device receiving chamber that is formed in the side wall and is positioned e 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 20 an agitator provided so as to correspond to the casting mold, the agitator including an ode unit that includes first and second electrodes supplying current to at least the liquid-phase melt present in the casting space, and a magnetic field generation device having a permanent magnet that applies a magnetic field to 25 the -phase melt, wherein 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 5 current, to the melt, wherein the magnetic field generation device is provided in the magnetic field generation device receiving chamber so that the on of the magnetic field generation device is able in a vertical direction according to the position of an interface n 10 liquid-phase product present in the casting space.

4. The g device of any one of claims 1 to 3, n a power supply is connected to the first and second electrodes.

5. A molding device for continuous casting equipped with an agitator which receives liquid-phase melt of a conductive material and from which solid-phase cast product is taken out through the cooling of the melt, the molding device comprising: 20 a casting mold including a casting space that includes an inlet and an outlet at a central portion of a 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 25 the casting space and discharging the solid-phase cast product from the outlet h the cooling in the casting space; and an agitator ed so as to correspond to the casting mold, the agitator including an electrode unit that includes first and second electrodes ing current to at least the liquid-phase melt t in the casting space, and a magnetic field generation 5 device having a permanent magnet that applies a magnetic field to the liquid-phase melt, wherein 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 10 a lateral direction, makes the magnetic lines of force pass through a part of the side wall of the casting mold and reach the g space, and applies lateral magnetic lines of force, which cross the current, to the melt, wherein a power supply, which supplies ate current 15 between the first and second electrodes, is connected to the first and second electrodes.

6. The molding device according to claim 4 or 5, wherein the power supply has a function of changing 20 frequency.

7. The molding device ing to claim 3 or 5, wherein the magnetic field generation device receiving chamber functions as a cooling chamber that allows the flow of 25 cooling water.

8. A molding device according to any one of claims 1 to 5, wherein the magnetic field generation device is provided in the magnetic field generation device receiving chamber so that the position of the magnetic field generation device is adjustable in a 5 vertical direction according to the position of an interface between liquid-phase t present in the casting space.

9. The molding device according to any one of claims 1 to 8, wherein discharge channels through which cooling water 10 flowing in the magnetic field tion device receiving chamber is jetted to the product are formed in the casting mold.

10. The molding device according to any one of claims 1 to 9, 15 wherein the cross-section of the magnetic field generation device receiving chamber is formed in a frame shape so that the magnetic field generation device ing chamber surrounds the entire ery of the casting space. 20

11. The molding device according to any one of claims 1 to 9, n the magnetic field generation device receiving chamber is formed of a plurality of partial ic field generation device receiving chambers that are divided and ndent, and each of the partial magnetic field generation device receiving 25 chambers is formed so as to surround a part of the entire periphery of the casting space.

12. The molding device according to claim 10, wherein the cross-section of the ic field generation device is formed in a frame shape, the inner peripheral portion of 5 the magnetic field generation device is magnetized to a first pole, and the outer peripheral portion of the magnetic field generation device is magnetized to a second pole.

13. The molding device according to claim 10, 10 wherein the magnetic field generation device includes a support that has a frame-shaped cross-section and a plurality of permanent magnet pieces that are mounted on the inner surface of the support at a predetermined interval, and inner and outer surfaces of each of the permanent magnet 15 bodies are magnetized.

14. The molding device according to claim 10, wherein the ic field generation device es a ity of permanent magnet , and the plurality of 20 permanent magnet pieces are received in the magnetic field generation device receiving chamber at a predetermined interval.

15. The molding device according to claim 11, n the magnetic field generation device includes a 25 plurality of permanent magnet pieces, and the plurality of permanent magnet pieces are received in the partial magnetic field generation device receiving chambers, tively.

16. The molding device according to any one of claims 1 to 9, 5 wherein the first electrode is provided so as to conduct electricity to the liquid-phase melt present in the casting mold, melt conducting electricity to the melt, or other components, and the second electrode is provided so as to conduct electricity to a phase t taken out from the casting mold and the 10 product.

17. The molding device according to any one of claims 1 to 9, wherein both the first and second electrodes are provided so as to conduct electricity to the -phase melt present in the 15 casting mold.

18. The molding device according to any one of claims 1 to 17, wherein the casting mold has a single structure using a non-conductive material, a single structure using a tive 20 material, or a double structure using a non-conductive material and a conductive material.

19. The molding device according to any one of claims 1 to 18, wherein the second electrode includes a roller at the end thereof, and the roller is rotated by coming into contact with the outer surface of the cast product to be taken out. 5

20. A molding device for continuous casting substantially as herein described with nce to any one of the embodiments illustrated in the accompanying drawings.