KR101562876B1 - Mold device for continuous casting having stirring device - Google Patents

Abstract

A mold for receiving molten liquid in a liquid state from an inlet in a casting space and discharging the casting in a solid state from the outlet by cooling in the casting space; and a stirring device provided corresponding to the casting, And a magnetic field generating device having a permanent magnet for applying a magnetic field to the molten liquid in a liquid state, wherein the magnetic field generating device comprises: The apparatus is housed in the magnetic field generator accommodating chamber of the mold so as to generate a magnetic force line in the lateral direction toward the center direction and to allow the magnetic force line to pass through a part of the side wall of the mold to reach the casting space, And a magnetic force line in the transverse direction intersecting with the current It is equipped with a stirrer, and suppress the amount of heat generated, and the maintenance is easy, and provides an easy to use virtually stirrer attached continuous casting mold apparatus at a low cost.

Description

Technical Field [0001] The present invention relates to a casting apparatus for continuous casting with a stirring device,

The present invention relates to a continuous casting process for producing billets or slabs of non-ferrous metals or other metals of conductors (conductors) such as Al, Cu, Zn or at least two of these alloys or Mg alloys, And to a casting apparatus for continuous casting with an agitator in a facility.

Conventionally, in a mold for continuous casting, a molten metal stirring method as described below is adopted. That is, in order to improve the quality of slabs, billets and the like, in the step of solidifying these molten metal, that is, when the molten metal passes through the mold, a moving magnetic field is imparted to the molten metal inside the mold by the electromagnetic coil from the outside of the mold So that stirring is generated in the molten metal just before solidification. This agitation is mainly for degassing and homogenization of the tissue. However, in the case of disposing the electromagnetic coil at a position close to the high temperature molten metal, cooling of the electromagnetic coil and complicated repair are required, and naturally a large power consumption is required. There is a problem in that heat can not be avoided and these heat must be cooled, and the device itself can not be expensive due to these.

Patent Document 1: Japanese Patent Application Laid-Open No. 9-99344

An object of the present invention is to provide a casting apparatus for continuous casting with an agitating device which is easy to use in practical use at low cost and which is capable of suppressing a heating value and being easy to repair.

In the casting apparatus for continuous casting with an agitator according to the embodiment of the present invention,

A casting apparatus for a continuous casting with an agitator capable of receiving molten metal in a liquid state of a conductive material and taking out a casting in a solid state by cooling the molten metal,

A casting space having an inlet and an outlet at a center side of a substantially cylindrical sidewall as a mold and a magnetic field generator accommodating chamber formed inside the sidewall and located outside the casting space, A mold for receiving the molten liquid in a liquid state in the casting space and discharging the casting in a solid state from the outlet by cooling in the casting space;

An electrode portion having a first electrode and a second electrode capable of flowing a current into the molten metal in a liquid phase state in at least the casting space and an electrode portion having an electrode portion for applying a magnetic field to the molten metal in a liquid state Wherein the magnetic field generating device is housed in the magnetic field generating device accommodating chamber of the mold so as to generate a magnetic force line in the lateral direction toward the center direction, And allowing the molten metal to pass through a part of the molten metal so as to reach the casting space and to apply a magnetic force line in the transverse direction crossing the current to the molten metal.

Fig. 1 (a) is an overall configuration diagram of an embodiment of the present invention, and Fig. 1 (b) and Fig.
Fig. 2 (a) is an explanatory view of the plan view along line II (a) - II (a) of Fig. 1, and Fig.
Fig. 3 (a) is a plan explanatory view of the magnetic field generating device 31 in the agitating device 3, and Fig. 3 (b) is a plan explanatory view of a variation thereof.
Fig. 4 (a) is a planar explanatory view of still another modified example of the magnetic field generating device 31 in the stirring device 3, and Fig. 4 (b) is a planar explanatory view of a modified example thereof.
5 is an overall configuration diagram of another embodiment of the present invention.
FIG. 6 is an overall configuration diagram of still another embodiment of the present invention. FIG.
FIG. 7 is an overall configuration diagram of still another embodiment of the present invention. FIG.
Fig. 8A is an overall structural view of still another embodiment of the present invention, Fig. 8B is a bottom view of the mold, and Fig. 8C is a cross-sectional view taken along the line VIII- (D) is a plan view of the magnetic field generator, and (e) is a plan view of the cover.
FIG. 9A is an overall configuration diagram of still another embodiment of the present invention, FIG. 9B is a cross-sectional view taken along line IX-BX-IX (b), and FIG.
10 is an overall configuration diagram of still another embodiment of the present invention.

In order to deepen the understanding of the embodiment of the present invention, an electromagnetic stirring device using electric power in the conventional continuous casting equipment is briefly described.

Conventionally, molten metal M of non-ferrous metal is poured in a molten metal from a molten metal receiving box called tundish and poured into the molten metal in the lower molten metal. The cooling water for cooling the mold is circulated in the mold. As a result, the molten metal at a high temperature starts solidifying from the outer peripheral side (mold side) from the moment when the molten metal comes into contact with the mold.

Since the molten metal located at the center of the mold is separated from the mold wall during the cooling, the solidification is naturally slower than the molten metal at the outer periphery. Therefore, in the mold, the molten metal is simultaneously present in a state in which the molten metal in a liquid (liquid) state and the casting in a solid (solid) state are in contact with each other through the interface. In general, if the molten metal is solidified too rapidly, the gas remains in the solid structure (product) and the quality of the product deteriorates. For this reason, the molten metal before solidification is stirred to promote degassing. For this stirring, conventionally, an electric stirring device using electric power has been used.

However, the use of such an electromagnetic stirring apparatus has various difficulties as described above.

Therefore, in the present invention, it is an object of the present invention to provide a continuous casting mold apparatus with a stirring device by a permanent magnet which does not use the electromagnetic stirring apparatus using electric power.

Embodiments of the present invention are described in detail below.

Fig. 1 (a) shows an overall configuration of an embodiment of the present invention. Fig. 2 (a) is an explanatory plan view of Fig. 1 (a) along the line II (a) -II (a) and mainly shows a part of the mold 2 and the stirring apparatus 3, Shows a plan view of the magnetic field generating device 31 in the stirring device 3. [

As can be seen from Fig. 1 (a), the apparatus according to the embodiment of the present invention is roughly divided into a non-ferrous metal of Al, Cu, Zn or at least two of these alloys, A mold 2 for receiving the molten metal from the molten metal supply device 1 and a stirring device for stirring the molten metal M in the mold 2 3). The center side of the mold 2 is a so-called casting space 2A (1) in which the inlet 2A (1) 1 and the outlet 2A (1) 2 are provided.

The molten metal supplying apparatus 1 includes a turn-dish (molten metal receiving box) 1A for receiving molten metal M from a ladle (not shown) or the like. The molten metal M is accumulated in the tundish (molten metal receiving box) 1A and the inclusions are removed to supply the molten metal M from the lower opening 1B to the mold 2 at a constant feeding speed. In Fig. 1, only a turn-dish (molten metal receiving box) 1A is shown.

In the present embodiment, the mold 2 is constructed by taking out a cylindrical product P (billet). For this reason, the mold 2 is roughly structured as a cylindrical shape of a double structure (the cross section is ring-shaped). That is, an inner mold 21 made of a non-conductive material such as graphite (carbon) on the inner side and an outer mold 22 made of a conductive material (conductive refractory material) such as aluminum or copper on the outside are sandwiched As shown in FIG.

Inside the side wall of the outer mold 22, a magnetic field generating device 31 is incorporated in a housed state as will be described later in detail. Further, even when a product (slab) of a prism shape is taken out, the technical thinking is the same, and the technical idea of the embodiment described below can be applied as it is. Simply, the shape of the part corresponding to the rectangular slab of the product is changed.

The mold (2) is provided with a water jacket (23) on the outer side of the outer mold (22).

The water jacket 23 is for cooling the molten metal M flowing into the inner mold 21. [ That is, the cooling water is introduced into the water jacket 23 from an inlet (not shown) to circulate the cooling water in the water jacket 23, and the outside of the outer mold 22 is cooled by the cooling water to cool the cooling water . The molten metal M is rapidly cooled by the water jacket 23. As the water jacket 23, any of various known structures can be employed, and therefore, a detailed description thereof will be omitted here.

The mold 2 having the above-described structure is provided with a plurality of electrode insertion holes 2a, 2a, ..., which sandwich the electrode 32A to be described later, at predetermined intervals on the circumference. The electrode insertion hole 2a is formed to be inclined downward toward the center of the mold 2. [ Therefore, even if the molten metal M is contained in the mold 2, if the surface of the molten metal M is lower than the opening of the upper end of the electrode insertion hole 2a, the molten metal M does not leak to the outside.

As described above, the stirring device 3 is installed on the sidewall of the mold 2 in a built-in state. The stirring apparatus 3 includes a permanent magnet type magnetic field generating device 31 and a pair of upper electrode 32A and lower electrode 32B.

The magnetic field generating device 31 is particularly formed in a ring shape (rim shape), as can be seen from Fig. 3 (a). The entire circumference of the inner circumferential side may be magnetized to the N pole and the entire circumference of the outer circumferential side may be magnetized to the S pole. In addition, the inner and outer circumferential sides may be partially magnetized to the N pole and the S pole, respectively, for example, as shown in FIG.

As can be seen from the following description, the magnetic field generator 31 does not necessarily have to be ring-shaped but may be divided into a plurality of divided states, for example, as shown in Fig. 8 (d) (Fig. 4). The magnetic field generator 31 is incorporated in the outer mold 22, as has been briefly described above, in particular, as can be seen from Fig. 1 (a).

More specifically, as can be seen from Fig. 1 (a), the outer mold 22 is provided with a magnetic field generator accommodating chamber 22a having a ring-shaped transverse section whose lower side is a release opening on the side wall. The magnetic field generating device housing chamber 22a can also be seen in Fig. 2 (b). 2 (b) shows the outer mold 22 from below. Particularly, as can be seen from Fig. 1 (a), the magnetic field generating device 31 having a ring-shaped transverse section equally in the ring-shaped cross section of the magnetic field generator accommodating chamber 22a whose lower- Is accommodated so as to be adjustable by movement. That is, the magnetic field generator 31 is provided so as to be adjustable in its height in the magnetic field generator storage chamber 22a by a desired means (not shown). Thus, as can be seen from FIG. 1 (a), the height of the molten metal M in the liquid phase can be adjusted to stir the molten metal M more efficiently as described later. The lower opening of the magnetic field generating device housing chamber 22a is closed by a ring-shaped lid 22B. The lid 22B may be configured to have the waterproof passage 22B (1) for discharging the cooling water to the outside as in the lid 22B of Fig. 8A described later.

As described above, four magnetic field generators 31 are magnetized as shown in Fig. 3 (a) to form magnetic pole pairs 31a, 31a, .... That is, with respect to each of the pair of magnetic poles 31a and 31a, the inner magnetic pole of the ring is magnetized to the N pole and the outer magnetic pole is magnetized to the S pole, and the magnetic force line ML from the N pole is magnetized toward the center of the ring 2) horizontally through the molten metal (M) inside.

This and magnetization may be opposite. That is, the inner side may be magnetized to one pole and the outer side may be magnetized to the other pole. One of the other features of the present invention is to arrange a plurality of magnetic poles at a plurality of locations around the ice-melted molten metal M before solidification, as can be seen from Fig. 3 (a). Thus, as described later, the quality of the product P can be improved by uniformly stirring the molten metal M by the electromagnetic force of the Fleming's law due to the magnetic line of force and the current. Therefore, the number of stimuli is four in Fig. 3 (a), and the number of stimuli is not limited to this number but may be any number. As described above, the magnetic field generating device 31 need not be constituted as one ring-shaped one but may be divided into a plurality of magnet pieces (magnet pieces) as shown in Fig. 8 (d) It may be.

In Fig. 1 (a), a current flows between the pair of electrodes 32A and 32B through the molten metal M and the cast product P. The number of the electrodes 32A may be one, but a plurality of electrodes 32A may be provided. In the present embodiment, there are two electrodes 32A. The electrode 32A is formed in a probe shape.

Each of the electrodes 32A is inserted into the above-described probe insertion hole 2a. That is, the electrode 32A penetrates the mold 2 (the inner mold 21 and the outer mold 22) from the water jacket 23 so that the inner end thereof is exposed in the inner mold 21, M, and the outer end is exposed to the outside of the water jacket 323. The outer end is connected to a power supply device 34 capable of flowing a variable DC current. The power supply device 34 may have an AC power supply function as described later or may have a frequency conversion function. The electrode 32A is inserted into the molten metal M from the surface of the molten metal M whose inner end flows above the upper opening of the mold 2 without passing through the side wall of the mold 2, It may be supported in a state of being inserted. The electrode 32A may be electrically connected to the internal mold 21 such as graphite.

It is also possible to arbitrarily use the electrode 32A as the electrode 32A so that an arbitrary number of the electrodes 32A can be inserted into any of the electrode insertion holes 2a, 2a, ....

In Fig. 1 (a), the lower electrode 32B is provided in a fixed position. The electrode 32B is of a roller type. That is, the roller 32Ba rotatable at its tip end is provided. The roller 32Ba is in pressure contact with the outer surface of the cylindrical product P as a cast product (billet or slab) pushed into a solid state, and the product P is rotated together with the product P extending downward. That is, when the product P is pushed downward, the product P is extended downward in Fig. 1 while rotating the roller 32Ba while maintaining contact with the roller 32Ba.

Therefore, when a voltage is applied between the pair of electrodes 32A and 32B from the power supply unit 34, a current flows between the pair of electrodes 32A and 32B through the molten metal M and the product P. As described above, the power supply device 34 is configured to control the amount of current flowing between the pair of electrodes 32A and 32B. Thereby, it is possible to select a current capable of stirring the molten liquid M in the liquid phase most efficiently in relation to the magnetic force line ML.

Next, the operation of the apparatus having the above configuration will be described.

In Fig. 1 (a), molten metal M which has been metered out from the turn-dish (molten metal receiving box) 1A enters the upper part of the mold 2. Fig. The mold 2 is cooled by the circulation of water in the water jacket 23 and the molten metal M in the mold 2 rapidly cools and solidifies. However, the molten metal M in the mold 2 has a two-phase structure in which the upper portion is in contact with the liquid (liquid phase) and the lower portion is solid (solid phase) at the interface IT0. The molten metal M is formed into a shape (circumferential shape in this embodiment) conforming to the shape of the mold simultaneously with the passage of the mold 2, and is continuously formed into a product P as a slab or a billet.

1 (a), the magnetic field generator 31 of the permanent magnet type is accommodated in the side wall of the mold 2, and the magnetic field (magnetic force line ML) 2). In this state, when a DC current is supplied from the upper electrode 32A to the lower electrode 32B by the power supply device 34, the current flows from the upper electrode 32A to the lower electrode 32B through molten aluminum Liquid phase) M to the product (solid phase) P. At this time, the magnetic force line ML coming from the permanent magnet type magnetic field generating device 31 traverses the current at a substantially right angle, and the molten metal M in the liquid state is rotated according to the Fleming's left-hand rule. In this way, the molten metal M is stirred, impurities, gas and the like contained in the molten metal M are floated, so that degassing is actively performed, and the quality of the product (slab, billet) P can be improved have.

The solidification speed of the molten metal M changes and the interface IT0 between the molten metal (liquid phase) M and the product (solid phase) P changes with the change in the cooling ability by the water jacket 23 or the like, It goes up and down. That is, when the cooling capability is increased, as shown in Fig. 1 (b), the interface IT0 rises like the interface IT1. When the cooling ability is weakened, as shown in Fig. 1 (c), the interface IT0 goes down like the interface IT2. In order to efficiently stir the molten metal M, it is preferable to move the magnetic field generating device 31 up and down in accordance with the positions of the interfaces IT0, IT1 and IT2. As a result, the product P can be obtained as a high-quality product by effectively and efficiently stirring the molten metal M. Therefore, as shown in Figs. 1 (b) and 1 (c), the height of the magnetic field generating device 31 is adjusted up and down according to the heights of the interfaces IT1 and IT2, do. Thus, the molten metal M can be efficiently stirred as described above.

The double structure of the mold 2 may be made of a conductive material on the inner side and a non-conductive material on the outer side, as opposed to the above. In this case, at least the electrode 32A may be electrically contacted with the inner conductive material. Also in this case, the magnetic field generating device housing chamber 22a may be provided on the outer member.

In addition, the mold 2 may not be a double structure but may have a single structure. In this case, the mold 2 may be made of only a conductive material, and the electrode 32A may be electrically connected to the mold 2. [ The structure of the other electrode 32B may be the same as that described above.

Conversely, the mold 2 may be made of only a non-conductive material. In this case, it is necessary to electrically connect the electrode 32A with the molten metal M in the mold 2 by, for example, passing the electrode 32A through the mold 2 as shown in Fig. 1 (a) .

In these cases, the magnetic field generating device housing chamber 22a may naturally be provided in a member having a single structure.

The magnetic field generator 31A shown in Fig. 3 (b) can be used in place of the magnetic field generator 31 shown in Fig. 3 (a). The magnetic field generator 31A shown in Fig. 3 (b) has the magnetization direction opposite to that of the magnetic field generator 31 shown in Fig. 3 (a). Both are functionally equivalent.

The magnetic field generators 31-2 and 31A-2 shown in Figs. 4A and 4B may be replaced with the magnetic field generators 31 and 31A shown in Figs. 3A and 3B instead of the magnetic field generators 31 and 31A shown in Figs. It can also be used. The magnetic field generators 31-2 and 31A-2 shown in Figs. 4A and 4B have a structure in which a plurality of rod-like permanent magnets PM are fixed inside a ring-shaped support (column) SP . These are functionally equivalent.

In the above embodiment, the lower electrode 32B has the roller 32Ba at the tip, but it is not always necessary to provide the roller 32Ba. Even if the product P is continuously pushed, the product P and the electrode 32B need to maintain the electric conduction state, and various structures can be adopted. For example, an elastic member having a predetermined length may be used as the electrode 32B. In Fig. 1, for example, the elastic member may be bent so as to be convex on the bottom or convex on the bottom, And the casting product P is allowed to extend downward in this state.

According to the embodiment of the present invention described above, the following effects can be obtained.

In the embodiment of the present invention, the molten metal (M) immediately before solidification is stirred to impart motion, vibration, and the like to the molten metal (M), thereby achieving a degassing effect and uniformizing and finer texture.

More specifically, in the embodiment of the present invention, since the magnetic field generating device 31 is adjustable up and down, the high-quality product P can be obtained by surely stirring the molten metal M. This is one of the features of the present invention as described above, and is a device which easily becomes a high-temperature and large-sized apparatus as in the embodiment of the present invention and has almost no empty space, and the magnetic field generating device 31 enclosed in the mold Since the idea of moving it up and down is not familiar to a person skilled in the art, the technique of the present invention, in which the magnetic field generating device is housed in the mold and is adjustable up and down, is unique to the inventor.

Further, in the embodiment of the present invention, the magnetic field generating device 31 is configured such that a plurality of magnetic poles or a ring-shaped magnet surrounding the periphery of the molten metal M are arranged at a position surrounding the molten metal M Therefore, the molten metal M can be agitated with high efficiency evenly by the electromagnetic force according to the Fleming's law due to the magnetic line of force and the current, so that the product P can be obtained as high quality. That is, in the embodiment of the present invention, the electromagnetic force according to the Fleming's law can be maximized, and the melt M can be efficiently stirred. The axis of rotation of the molten metal (M) accompanying the stirring is an axis along the central axis of the product (P) in Fig. 1 (a). As a result, the product P can be obtained with high quality by making sure that the rotation of the molten metal M is driven.

Further, in the embodiment of the present invention, since the molten metal M is stirred by the electromagnetic force according to the Fleming's law, the small current flowing in the molten metal M cooperates with the magnetic field generated from the magnetic- Therefore, unlike the dissolving stirring in which a large current is intermittently flowed by the principle of arc welding or the like, stable stirring can be stably continued, a device with low noise and high continuity can be obtained.

It goes without saying that the above-described effects are obtained for all the embodiments described below.

In the above description, the DC current is supplied between the electrodes 32A and 32B. Alternatively, alternating current of a low cycle of about 1 to 5 Hz may be supplied from the power supply device 34. [ In this case, in relation to the magnetic field from the magnetic field generating device 31, the molten metal M is not rotated but repeatedly oscillates in accordance with the period. Impurities are also removed from the molten metal (M) by this vibration. The application of this modification can be applied to all the embodiments described below. In this case, it is a matter of course that a power source device 34 having a frequency conversion function is employed.

And now, it is required to realize mass production facilities in industry. When mass production is considered, it is indispensable to realize a mold as small as possible.

Here, in the conventional electronic stirring, it is possible to cope with the case where the number of slabs or billets produced at one time is several. However, there are now requests to produce more than 100 billets simultaneously. This request can not be followed by conventional electromagnetic stirring devices.

However, in the device of the present invention, a permanent magnet is used as a magnetic field generating device. Therefore, it is possible to make it very compact as compared with an electromagnetic stirring device for flowing a large current. Thus, the realization of a mold apparatus for mass production facilities is sufficiently possible. In addition, since the permanent magnet type permanent magnet type magnetic resonance apparatus is used as the magnetic field generating apparatus, it is possible to obtain an apparatus that has no heat generation, such as power saving, energy saving, low maintenance and the like.

Fig. 5 shows another embodiment.

A large amount of current is flowed by the molten metal M in the liquid phase state to generate a larger electromagnetic force to rotate the molten metal M. [

The difference from the embodiment of Fig. 1 (a) lies in the structure of the mold 2A. The other configuration is substantially the same as in Fig. 1 (a). Therefore, detailed description is not given here.

That is, the mold 2A of this embodiment has the substantially cylindrical main body 2A1. The mold main body 2A1 is formed as having a circumferential groove 2A1 (a) on its inner circumferential surface. An insulating film 2A2 is formed on the inner surface (peripheral side surface and bottom surface) of the groove and a conductive material equivalent to the mold body 2A1 is embedded on the insulating film 2A2 to form the buried layer 2A3. An insulating layer portion is constituted by the insulating film 2A2 and the buried layer 2A3. This insulating layer portion is formed in a part of the inner surface of the mold and functions as a portion which does not allow the flow of the current from the mold.

This insulating layer portion is provided at a slightly lower portion of the inner surface of the mold main body 2A1.

As a result, the current to the casting product P from the insulating layer portion in the mold main body 2A1, that is, the portion in contact with the casting product P, is not allowed as much as possible.

A terminal 2A4 is provided on the outer peripheral side of the mold main body 2A1. So that the mold 2A can be fed from the power source device 34 through the terminal 2A4.

When a voltage is applied between the terminal 2A4 and the electrode 32B in the power supply device 34 in the thus structured apparatus, a current flows in the mold main body 2A1, the molten metal M, and the cast product P. At this time, since a current does not flow in the insulating film 2A2 and the buried layer 2A3, a larger current flows through the molten metal M, and the larger the amount of the electromagnetic force to stir the molten metal M is obtained.

Fig. 6 shows another embodiment.

This embodiment is a modification of the embodiment of Fig. 1 (a).

The present embodiment is different from the embodiment shown in Fig. 1 (a) in a method of disposing the upper electrode 32A in Fig. 1 (a). That is, in the present embodiment, one or a plurality of electrodes 32A0, 32A0, ... are arranged in an annular arrangement in a plurality of cases, and these electrodes 32A0 are connected to the mold 2A, And the water jacket 23), and the lower end portion of each electrode 32A0 is held in the molten metal M. This makes it possible to control the insertion amount of the lower end portion of the electrode 32A0 into the molten metal M with a greater degree of freedom irrespective of the mold 2A or the like. As a matter of course, it is natural to use a conventional mold 2A or the like, and it is not necessary to provide the electrode insertion hole 2a in the electrode 32A1 such as the mold 2A, .

The other configuration is the same as the embodiment of Fig. 1 (a).

Fig. 7 shows another embodiment.

This embodiment may be regarded as a modification of the embodiment of Fig.

The embodiment of Fig. 7 assumes a movable device in the case where the molten metal M is poured into the lower mold 2A from the upper turn-dish (molten metal receiving box) 1A as a continuous molten metal without interruption have. That is, it is assumed that the molten metal M in the tundish (molten metal receiving box) 1A and the molten metal M in the mold 2A are integrally connected.

In Fig. 6, the electrode 32A0 is sandwiched in the molten metal M in the mold 2. In Fig. 7, the electrode 32A1 is set as molten metal (molten metal) in the turn- M, and is supported by any means. In this way, the same advantage as in the embodiment of FIG. 7 can be obtained. In addition, the distance between the tundish (molten metal receiving box) 1A and the mold 2A can be set and adjusted regardless of the electrode 32A1.

The other configuration is the same as in Fig.

Figures 8 (a) - (d), Figures 9 (a) - (c), and Figure 10 show yet another separate embodiment of the present invention.

In these embodiments, the same components as those in the above-described embodiment are denoted by the same reference numerals, and a description thereof will be omitted.

In these embodiments, a water jacket for cooling is not separately provided, but a water circulation chamber (also referred to as a cooling chamber and a magnetic field generator accommodating chamber) is provided on the side wall of the mold 2, And a magnetic field generating device 31 as a permanent magnet is accommodated in the water circulation chamber 22a (2) so as to be vertically adjustable.

The magnetic field generator storage space 22a (2) shown in Fig. 8 (c) accommodates a plurality of permanent magnet pieces 31A at predetermined intervals shown in Fig. 8 (d) For example, a plurality of partial magnetic field generating device storage chambers each having a circular cross section.

First, a billet production apparatus of the embodiment shown in Figs. 8 (a) to 8 (e) will be described.

8 (a), the outer mold 22 has a ring-shaped water circulation chamber 22a (2) whose cross section is freed downward, and the water circulation chamber 22a (2 ) Is sealed with the lid 22B (1). Fig. 8 (b) shows the inner mold 21 and the outer mold 22 viewed from below along the line VIII (b) -VIII (b) with the lid 22B (1) off. The lid 22B (1) constitutes a part of the mold 2. [

As shown in Fig. 8 (a), a plurality of permanent magnet pieces 31A, 31A, and 31B having an arc-shaped cross section are formed in a ring-shaped water distribution chamber 22a (2) as a magnetic field generator storage space (storage chamber) (Fig. 8 (c)) is accommodated so as to be vertically adjustable. That is, the water circulation chamber (cooling chamber) 22a (2) has a function as a cooling water circulation chamber and a magnetic field generator storage chamber. A plan view of these permanent magnet pieces 31A is shown in Fig. 8 (d). Each permanent magnet piece 31A has, for example, an inner N pole and an outer S pole. The magnetization may be reversed. That is, the magnetic field generating device 31 is provided so as to be adjustable in height in the water circulation chamber 22a (2) by any means not shown. Thus, as described above, the height of the molten metal M is adjusted so as to correspond to the molten metal M in the liquid phase state, so that the molten metal M can be agitated more efficiently.

The lower opening of the water flow chamber 22a (2) is closed by the ring-shaped lid 22B. A plan view of the lid 22B is shown in Fig. 8 (e). As can be seen from Fig. 8 (e) and Fig. 8 (a), a plurality of waterproofing passages 22B (1) of cooling water are formed in the lid 22B (1). 8A and 8E, the plurality of watertight passages 22B (1) have a plurality of openings 22B (1) a1 opened on the upper surface of the lid 22B, And an outlet 22B (1) a2 on the peripheral side surface of the lid 22B. As a result, the cooling water in the water circulation chamber 22a (2) enters from the plurality of inlets 22B (1) a1, flows out from the outlet 22B (1) a2 and is sprayed on the outer periphery of the product P . That is, the cooling water enters the water circulation chamber 22a (2) from an inlet (not shown), circulates through the water circulation chamber 22a while being cooled, and is discharged from the waterproof passage 22B (1) to the outside.

The operation of the apparatuses of Figs. 8 (a) to 8 (e) described above is the same as that of the above-described embodiment, and a description thereof will be omitted.

8A to 8E described above, the magnetic field generating device 31 is made up of a plurality of permanent magnet pieces 31A. However, the permanent magnet pieces 31A may be integrally formed as shown in Fig. 3 (a) It is natural to be able to do. 8 (b), the water distribution chamber 22a (2) as the magnetic field generator storage space is configured to have a peripheral shape. However, the present invention is not limited to this configuration, And a plurality of cross-sections each having a circular arc shape. It is sufficient that cooling water can flow through each cell chamber and the permanent magnet piece 31A can be housed so as to be movable up and down.

8 (a) to 8 (e), the magnetic field generating device 31 is not provided outside the mold 2 but is provided in the mold 2 (outer mold 22) And the magnetic field generating device 31 is accommodated in the cavity, the following features can be obtained.

- Small and small-capacity permanent magnets can be used as the magnetic field generator (31).

That is, when the magnetic field generator 31 is enclosed in the mold, it is inevitable that the distance between the magnetic field generator 31 and the melt M is slightly distant. However, in the present embodiment, when the distance between the magnetic field generator 31 and the molten metal M is reduced and the same stirring ability is obtained because the magnet is embedded in the mold 2, a smaller and more compact permanent magnet can be used have.

- Workability can be greatly improved.

That is, at the time of operation of the apparatus, a plurality of inspectors for performing various kinds of measurements and non-destructive inspections are positioned around the apparatus to check the product (P) You must do it. However, in the case of the external magnetic field generating device, it is inevitable that it becomes large and bulky, and that it is difficult to perform such a measurement operation because a strong magnetic field is generated. However, in this embodiment, since the magnetic field generating device 31 is provided in the mold 2, not only the volume is not large, but also the strength of the magnetic field radiated to the outside is weakened, and various measurements and the like are easily made.

- It can greatly improve productivity.

That is, since the time required for the measurement and the like can be shortened, the production speed of the product P per a short time can be increased as a result.

- It is possible to miniaturize.

That is, since the magnetic-field generating device 31 is built-in, it is possible to provide the whole device as a small-sized device.

- It is possible to save space at installation site.

In other words, if it is the same as the above but is seen as an apparatus for manufacturing the same product P, since the magnetic field generating apparatus 31 is built-in, it can be installed in a narrow place as a whole, .

The above-described effects will be described separately from the following points.

In manufacturing the product (P) in this apparatus, for example, 5 or 6 workers are gathered around the apparatus, and a work with a high density in a short time (surveillance of molten metal leaking, prevention of molten metal leaching, And so on). In the case where these operations are carried out by a plurality of workers, the built-in apparatus of the present embodiment has better workability in comparison with the case where the magnetic-field generating apparatus 31 protrudes to the exterior. That is, the external appearance of the apparatus can be the same size as that of the conventional apparatus without the magnetic field generating apparatus 31, and the feeling of use of the apparatus of the present embodiment in the field is very good.

In order to ensure that the magnetic field is applied to the molten metal M, it is preferable that the magnetic field generating device 31 is as close as possible to the molten metal M as far as possible.

When the magnetic field generating device 31 is external, it is necessary to consider the influence of the magnetic field on various measuring instruments such as the temperature sensor. That is, in manufacturing a product P such as a slab or a billet, temperature measurement and management in a plurality of parts of the product P are very important issues in order to maintain the quality of the product. Such temperature measurement and the like are extremely advantageous in the present embodiment.

If the magnetic field generating device of the present invention is built as in the present embodiment instead of the external magnetic field generating device, the same magnetic field can be applied to the molten metal M to make it small, and its weight and volume can be made small. It can be good. That is, each component of the apparatus is a consumable item, and it is necessary to change it appropriately every predetermined period of the operation time. However, since the magnetic field generating device 31 and the like can be made compact and lightweight, the exchange operation can be carried out very easily.

The operation in the apparatus of the present embodiment is an operation at a high temperature of about 700 DEG C, which is a very dangerous operation for the operator. However, it is possible to use a magnetic field generating device 31 that is small in size and low in magnetic field intensity. In addition, safety shoes and the like are made of iron. If the magnetic field of the magnetic field generating device 31 radiated to the outside is weakened even a little, Safety of the worker and the measurement source is maintained.

The effects described above with reference to Figs. 8 (a) to 8 (e) can also be applied to the apparatus shown in Fig. 1 and the like, the apparatuses for producing slabs shown in Figs. 9 (a) It is natural to have.

Figures 9 (a) - (c) show a device for manufacturing slabs, wherein the billets are circular, but the basic technical mindset is the same, except that the slabs are square. Therefore, like parts are denoted by the same reference numerals and description thereof is omitted.

The differences are as follows.

The weight of the product (P) of the slab is considerably heavy. For this reason, although the billet can be pulled in the horizontal direction, the slab can not be pulled out of the product P by pulling it vertically. Therefore, the pedestal 51 is prepared, and the product P is pulled out in a state of being laid down on the pedestal 51 and slowly pulled downward. And the lower electrode 32B is embedded in the pedestal 51. [ The magnetic field generator 31 is shown in Figs. 9 (b) and 9 (c). 9 (b) is a sectional view taken along the line IX (b) -XX (b) of Fig. 9 (a), and Fig. 9 (c) is a plan view of the magnetic field generating device 31. Fig. Here, the magnetic field generating device 31 is made up of two opposing pairs using four permanent magnet pieces 31A, but any pair may be used.

Fig. 10 is a modification of Fig. 9 (a).

In Fig. 10, a pair of electrodes 32A and 32B are used in a state in which the molten metal M is sandwiched. The inventors of the present invention have confirmed by experiments that the molten metal M is stirred even by using the electrodes 32A and 32B. 10, even if the pair of electrodes 32A and 32B is used, the electric current flowing between the magnetic line of force from the magnetic field generating device 31 and the pair of electrodes 32A and 32B is changed in various directions And generates an electromagnetic force according to Fleming's law.

Claims (20)

A casting apparatus for a continuous casting with an agitator capable of receiving molten metal in a liquid state of a conductive material and taking out a casting in a solid state by cooling the molten metal,
A casting space having an inlet and an outlet at a center side of a cylindrical sidewall as a mold and a magnetic field generator accommodating chamber formed inside the sidewall and located outside the casting space, A mold for receiving the molten metal in the state of being cast in the casting space and discharging the casting in a solid state from the outlet by cooling in the casting space;
An electrode portion having a first electrode and a second electrode capable of flowing a current into the molten metal in a liquid phase state in at least the casting space and an electrode portion having an electrode portion for applying a magnetic field to the molten metal in a liquid state Wherein the magnetic field generating device is housed in the magnetic field generating device accommodating chamber of the mold so as to generate a magnetic force line in the lateral direction toward the center direction, And a stirring device which is configured to allow a part of the molten metal to pass through the casting space and to give a horizontal magnetic force line intersecting with the current to the molten metal,
The magnetic field generating device housing chamber is formed as having an opening which is downwardly opened in the side wall of the mold,
Characterized in that the opening of the magnetic field generator storage compartment is closed by a lid and the magnetic field generator storage compartment also serves as a cooling chamber for allowing cooling water to flow
Molding apparatus for continuous casting with stirring device.
A casting apparatus for a continuous casting with an agitator capable of receiving molten metal in a liquid state of a conductive material and taking out a casting in a solid state by cooling the molten metal,
A casting space having an inlet and an outlet at a center side of a cylindrical sidewall as a mold and a magnetic field generator accommodating chamber formed inside the sidewall and located outside the casting space, A mold for receiving the molten metal in the state of being cast in the casting space and discharging the casting in a solid state from the outlet by cooling in the casting space;
An electrode portion having a first electrode and a second electrode capable of flowing a current into the molten metal in a liquid phase state in at least the casting space and an electrode portion having an electrode portion for applying a magnetic field to the molten metal in a liquid state Wherein the magnetic field generating device is housed in the magnetic field generating device accommodating chamber of the mold so as to generate a magnetic force line in the lateral direction toward the center direction, And a stirring device which is configured to allow a part of the molten metal to pass through the casting space and to give a horizontal magnetic force line intersecting with the current to the molten metal,
Wherein the magnetic field generating device is provided in the magnetic field generator storage chamber so as to be vertically adjustable in position in accordance with the position of the interface between the molten liquid in the liquid phase state and the solid phase product in the casting space
Molding apparatus for continuous casting with stirring device.
A casting apparatus for a continuous casting with an agitator capable of receiving molten metal in a liquid state of a conductive material and taking out a casting in a solid state by cooling the molten metal,
A casting space having an inlet and an outlet at a center side of a cylindrical sidewall as a mold and a magnetic field generator accommodating chamber formed inside the sidewall and located outside the casting space, A mold for receiving the molten metal in the state of being cast in the casting space and discharging the casting in a solid state from the outlet by cooling in the casting space;
An electrode portion having a first electrode and a second electrode capable of flowing a current into the molten metal in a liquid phase state in at least the casting space and an electrode portion having an electrode portion for applying a magnetic field to the molten metal in a liquid state Wherein the magnetic field generating device is housed in the magnetic field generating device accommodating chamber of the mold so as to generate a magnetic force line in the lateral direction toward the center direction, And a stirring device which is configured to allow a part of the molten metal to pass through the casting space and to give a horizontal magnetic force line intersecting with the current to the molten metal,
And a waterproof passage for injecting the cooling water flowing in the magnetic field generator storage chamber toward the solid state product is formed in the mold.
Molding apparatus for continuous casting with stirring device.
A casting apparatus for a continuous casting with an agitator capable of receiving molten metal in a liquid state of a conductive material and taking out a casting in a solid state by cooling the molten metal,
A casting space having an inlet and an outlet at a center side of a cylindrical sidewall as a mold and a magnetic field generator accommodating chamber formed inside the sidewall and located outside the casting space, A mold for receiving the molten metal in the state of being cast in the casting space and discharging the casting in a solid state from the outlet by cooling in the casting space;
An electrode portion having a first electrode and a second electrode capable of flowing a current into the molten metal in a liquid phase state in at least the casting space and an electrode portion having an electrode portion for applying a magnetic field to the molten metal in a liquid state Wherein the magnetic field generating device is housed in the magnetic field generating device accommodating chamber of the mold so as to generate a magnetic force line in the lateral direction toward the center direction, And a stirring device which is configured to allow a part of the molten metal to pass through the casting space and to give a horizontal magnetic force line intersecting with the current to the molten metal,
And a power supply device capable of flowing a direct current between the first electrode and the second electrode is connected to the first electrode and the second electrode.
Molding apparatus for continuous casting with stirring device.
5. The method according to any one of claims 1 to 4,
Characterized in that the magnetic field generating device housing chamber is formed inside the side wall of the mold and at an outer circumferential position of the casting space
Molding apparatus for continuous casting with stirring device.
5. The method according to any one of claims 1 to 4,
Characterized in that cooling means is provided outside the mold
Molding apparatus for continuous casting with stirring device.
5. The method according to any one of claims 1 to 4,
Characterized in that the magnetic field generator accommodating chamber is formed in a shape of a transverse cross section so as to surround the entire periphery of the casting space
Molding apparatus for continuous casting with stirring device.
5. The method according to any one of claims 1 to 4,
The magnetic field generator storage chambers are each provided with a plurality of partitioned independent partial magnetic field generating device storage chambers and each of the partial magnetic field generating device storage chambers is formed to surround a part of the entire circumference of the casting space doing
Molding apparatus for continuous casting with stirring device.
8. The method of claim 7,
Characterized in that the magnetic field generating device is constituted such that the transverse section has a rim shape, the inner peripheral side is magnetized to the first pole, and the outer peripheral side is magnetized to the second pole
Molding apparatus for continuous casting with stirring device.
8. The method of claim 7,
Wherein the magnetic field generator comprises a support body having a transverse cross-section and a plurality of permanent magnet pieces attached to the inner surface of the support body at predetermined intervals, wherein each of the permanent magnet bodies is magnetized on the inner surface side and the outer surface side, respectively doing
Molding apparatus for continuous casting with stirring device.
8. The method of claim 7,
Wherein the magnetic field generator comprises a plurality of permanent magnet pieces, and the plurality of permanent magnet pieces are contained in the magnetic-field generating device storage chamber at predetermined intervals
Molding apparatus for continuous casting with stirring device.
9. The method of claim 8,
Characterized in that the magnetic field generator comprises a plurality of permanent magnet pieces and the permanent magnet pieces are contained in the partial magnetic field generating device storage chambers respectively
Molding apparatus for continuous casting with stirring device.
5. The method according to any one of claims 1 to 4,
Wherein the first electrode is provided so as to be electrically conductive with the molten liquid in a liquid state in the mold or with a molten metal or other part electrically conducting with the molten metal and the second electrode is in a solid state Characterized in that it is provided so as to be able to be electrically connected to the product of the product
Molding apparatus for continuous casting with stirring device.
5. The method according to any one of claims 1 to 4,
Wherein the first electrode and the second electrode are provided so as to be electrically conductive together with the molten liquid in the mold in the mold
Molding apparatus for continuous casting with stirring device.
5. The method according to any one of claims 1 to 4,
And a power supply device capable of flowing an alternating current between the first electrode and the second electrode is connected to the first electrode and the second electrode.
Molding apparatus for continuous casting with stirring device.
16. The method of claim 15,
Characterized in that the power supply device is provided with a frequency conversion function
Molding apparatus for continuous casting with stirring device.
5. The method according to any one of claims 1 to 4,
Wherein the mold is constituted by a single structure of a non-conductive material, a single structure of a conductive material, or a double structure of a non-conductive material and a conductive material
Molding apparatus for continuous casting with stirring device.
5. The method according to any one of claims 1 to 4,
Wherein the second electrode is provided with a roller at a tip end thereof and the roller is configured to be rotatable by contact with the outer surface of the cast article to be taken out
Molding apparatus for continuous casting with stirring device.
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