JP5431438B2 - Molding device for continuous casting with stirring device - Google Patents

Description

  The present invention provides continuous casting 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. The present invention relates to a mold apparatus for continuous casting with a stirring device in equipment.

  Conventionally, in a casting mold for continuous casting, a molten metal stirring method as described below has been adopted. That is, in order to improve the quality of slabs or billets, in the process of solidifying these melts, that is, when the melt passes through the mold, a moving magnetic field is applied to the melt inside the mold by an electromagnetic coil from the outside of the mold. In addition, the molten metal immediately before solidification is agitated. The main purpose of this stirring is to degas and homogenize the structure. However, since the electromagnetic coil is disposed close to the high-temperature molten metal, not only the cooling of the electromagnetic coil and complicated maintenance are necessary, but of course, large power consumption is required. It is inevitable that the coils themselves generate heat, and these heats must also be cooled, resulting in various problems such that the device itself must be expensive.

JP-A-9-99344

  The present invention has been made to solve the above-described problems, and its object is to provide a continuous casting mold apparatus with a stirrer that suppresses the amount of heat generation, is easy to maintain, is inexpensive and practically usable. There is.

The mold apparatus for continuous casting with a stirrer according to the embodiment of the present invention,
A casting apparatus for continuous casting with a stirrer that receives a supply of a molten metal in a liquid phase state of a conductive material and is capable of taking out a cast product in a solid phase by cooling the molten metal,
A casting space having an inlet and an outlet on the center side of the substantially cylindrical side wall; and a magnetic field generator housing chamber formed inside the side wall and positioned outside the casting space. Receiving a supply of the molten metal in the liquid phase from the inlet to the casting space, and discharging the casting in the solid phase from the outlet by cooling in the casting space;
A stirrer provided corresponding to the mold, wherein the first electrode and the second electrode can flow a direct current or an alternating current of 1 to 5 Hz through the molten metal in a liquid phase state in the casting space. An electrode section having electrodes, and a magnetic field generator having a permanent magnet for applying a magnetic field to the molten metal in a liquid phase state, the magnetic field generator being housed in the magnetic field generator housing chamber of the mold. The magnetic lines of force can be generated laterally toward the center direction, the magnetic lines of force can penetrate a part of the side wall of the mold to reach the casting space, and the lateral lines of magnetic force intersecting the current can be given to the molten metal. Comprising a stirring device;
With
The magnetic field generator storage chamber is formed as an opening opened downward in the side wall of the mold,
The opening of the magnetic field generation device storage chamber is closed by a lid, and the magnetic field generation device storage chamber is configured to also serve as a cooling chamber that allows circulation of cooling water.
It is comprised as what is characterized by this.
Furthermore, the mold apparatus for continuous casting with a stirrer of the embodiment of the present invention is:
A casting apparatus for continuous casting with a stirrer that receives a supply of a molten metal in a liquid phase state of a conductive material and is capable of taking out a cast product in a solid phase by cooling the molten metal,
A casting space having an inlet and an outlet on the center side of the substantially cylindrical side wall; and a magnetic field generator housing chamber formed inside the side wall and positioned outside the casting space. Receiving a supply of the molten metal in the liquid phase from the inlet to the casting space, and discharging the casting in the solid phase from the outlet by cooling in the casting space;
A stirrer provided corresponding to the mold, wherein the first electrode and the second electrode can flow a direct current or an alternating current of 1 to 5 Hz through the molten metal in a liquid phase state in the casting space. An electrode section having electrodes, and a magnetic field generator having a permanent magnet for applying a magnetic field to the molten metal in a liquid phase state, the magnetic field generator being housed in the magnetic field generator housing chamber of the mold. The magnetic lines of force can be generated laterally toward the center direction, the magnetic lines of force can penetrate a part of the side wall of the mold to reach the casting space, and the lateral lines of magnetic force intersecting the current can be given to the molten metal. Comprising a stirring device;
With
The magnetic field generator is provided in the magnetic field generator storage chamber so that the position can be adjusted up and down according to the position of the interface between the liquid-phase molten metal and the solid-phase product in the casting space. Yes,
It is comprised as what is characterized by this.
Furthermore, the mold apparatus for continuous casting with a stirrer of the embodiment of the present invention is:
A casting apparatus for continuous casting with a stirrer that receives a supply of a molten metal in a liquid phase state of a conductive material and is capable of taking out a cast product in a solid phase by cooling the molten metal,
A casting space having an inlet and an outlet on the center side of the substantially cylindrical side wall; and a magnetic field generator housing chamber formed inside the side wall and positioned outside the casting space. Receiving a supply of the molten metal in the liquid phase from the inlet to the casting space, and discharging the casting in the solid phase from the outlet by cooling in the casting space;
A stirrer provided corresponding to the mold, wherein the first electrode and the second electrode can flow a direct current or an alternating current of 1 to 5 Hz through the molten metal in a liquid phase state in the casting space. An electrode section having electrodes, and a magnetic field generator having a permanent magnet for applying a magnetic field to the molten metal in a liquid phase state, the magnetic field generator being housed in the magnetic field generator housing chamber of the mold. The magnetic lines of force can be generated laterally toward the center direction, the magnetic lines of force can penetrate a part of the side wall of the mold to reach the casting space, and the lateral lines of magnetic force intersecting the current can be given to the molten metal. Comprising a stirring device;
With
The first electrode and the second electrode are connected to a power supply device capable of passing an alternating current between them.
It is comprised as what is characterized by this.
Furthermore, the mold apparatus for continuous casting with a stirrer of the embodiment of the present invention is:
A casting apparatus for continuous casting with a stirrer that receives a supply of a molten metal in a liquid phase state of a conductive material and is capable of taking out a cast product in a solid phase by cooling the molten metal,
A casting space having an inlet and an outlet on the center side of the substantially cylindrical side wall; and a magnetic field generator housing chamber formed inside the side wall and positioned outside the casting space. Receiving a supply of the molten metal in the liquid phase from the inlet to the casting space, and discharging the casting in the solid phase from the outlet by cooling in the casting space;
An agitation device provided corresponding to the mold, wherein at least an electrode portion having a first electrode and a second electrode capable of flowing a current in the molten metal in a liquid phase state in the casting space; A magnetic field generator having a permanent magnet for applying a magnetic field to the molten metal in a phase state, the magnetic field generator being housed in the magnetic field generator housing chamber of the mold and being laterally directed toward the center direction. A stirrer configured to generate magnetic lines of force, to pass the magnetic lines of force through a part of the side wall of the mold to reach the casting space, and to give the molten metal lateral magnetic lines that intersect the current; ,
With
The magnetic field generator storage chamber is configured to also serve as a cooling chamber that allows cooling water to flow.
It is comprised as what is characterized by this.

(A) The whole block diagram of embodiment of this invention, (b), (c) The operation | movement explanatory drawing. (A) Plane explanatory drawing seen along the II (a) -II (a) line | wire of FIG. 1, (b) Bottom explanatory drawing of an external casting_mold | template. (A) Plane explanatory drawing of the magnetic field generator 31 in the stirring apparatus 3, (b) Plane explanatory drawing of the modification. (A) Plane | planar explanatory drawing of the further different modification of the magnetic field generator 31 in the stirring apparatus 3, (b) Plane | planar explanatory drawing of the modification. The whole block diagram of different embodiment of this invention. The whole block diagram of another embodiment of this invention. The whole block diagram of further different embodiment of this invention. (A) Overall configuration diagram of still another embodiment of the present invention, (b) Explanatory view of the bottom of the mold, (c) Cross-sectional view along line VIII (c) -VIII (c) in FIG. 8 (a), (D) Plane explanatory drawing of a magnetic field generator, (e) Plane explanatory drawing of a cover. (A) Whole block diagram of further another embodiment of this invention, (b) Sectional drawing along the IX (b) -IX (b) line, (c) Plane explanatory drawing of a magnetic field generator. The whole block diagram of another embodiment of this invention.

  In order to deepen the understanding of the embodiment of the present invention, an electromagnetic stirring device powered by electricity in a conventional continuous casting facility will be briefly described.

  Conventionally, a non-ferrous metal melt M is poured out from a molten metal receiving box called a tundish into a lower mold after a fixed amount of hot water. Cooling water for cooling the mold is circulated in the mold. Thereby, the hot molten metal starts to solidify from the outer peripheral side (mold side) from the moment of contact with the mold. Since the molten metal located at the center of the mold is separated from the mold wall being cooled, solidification is naturally delayed from the molten metal at the outer peripheral portion. Therefore, in the mold, the molten metal exists simultaneously in a state where the liquid (liquid phase) molten metal and the solid (solid phase) cast are in contact via the interface. Thus, generally, when the molten metal is solidified too quickly, gas remains in the casting (product) that has been changed to a solid, which deteriorates the quality of the product. For this reason, the melt before solidification is stirred to promote degassing. Conventionally, an electromagnetic stirring device powered by electricity has been used for this stirring.

  However, as described above, there are various difficulties when using such an electromagnetic stirring device.

  Therefore, the present invention intends to provide a continuous casting mold apparatus with a stirring device using a permanent magnet without using the electromagnetic stirring device powered by electricity.

  In more detail, the embodiment of the present invention is as follows.

  An overall configuration diagram of an embodiment of the present invention is shown in FIG. FIG. 2 (a) is an explanatory plan view taken along line II (a) -II (a) in FIG. 1 (a), mainly showing a part of the mold 2 and the stirring device 3, and FIG. a) shows a plan view of the magnetic field generator 31 in the stirring device 3.

  As can be seen from FIG. 1A, the apparatus according to the embodiment of the present invention is roughly divided into conductors (conductors) such as Al, Cu, Zn, at least two alloys thereof, or Mg alloys. It has a molten metal supply device 1 that supplies a molten metal M of non-ferrous metal or other metal, a mold 2 that receives the molten metal from the molten metal supply device 1, and a stirring device 3 that agitates the molten metal M in the mold 2. The center side of the mold 2 is a so-called casting space 2A (1) provided with an inlet 2A (1) 1 and an outlet 2A (1) 2.

  The molten metal supply apparatus 1 includes a tundish (a molten metal receiving box) 1A that receives a molten metal M from a ladle (not shown) or the like. The molten metal M is stored in the tundish (molten metal receiving box) 1A, the inclusions are removed, and the molten metal M is supplied from the lower opening 1B to the mold 2 at a constant supply speed. In FIG. 1, only the tundish (melt receiving box) 1A is shown.

  In the present embodiment, the mold 2 is configured to take out a cylindrical product P (billet). For this reason, this casting_mold | template 2 is comprised roughly as a cylindrical structure (a cross section is ring shape) of a double structure. In other words, the inner mold 21 made of non-conductive material (non-conductive refractory material) such as inner graphite (carbon) and the outer conductive material (conductive refractory material) such as aluminum or copper. The external mold 22 is provided in a fitted state. As will be described in detail later, a magnetic field generator 31 is incorporated in the housed state inside the side wall of the external mold 22. The technical idea is the same even when a prismatic product (slab) is taken out, and the technical idea of the embodiment described below can be applied as it is. Simply, the shape of the part corresponding to the square slab that is the product is changed.

  Further, the mold 2 includes a water jacket 23 on the outside of the external mold 22. The water jacket 23 is for cooling the molten metal M flowing into the internal mold 21. That is, cooling water is introduced into the water jacket 23 from an inflow port (not shown), the cooling water is circulated in the water jacket 23, the outside of the external mold 22 is cooled by this cooling water, and is cooled from an outflow port (not shown). Drain the water. Due to the water jacket 23, the molten metal M is rapidly cooled. As the water jacket 23, those having various known structures can be adopted, and therefore detailed description thereof is omitted here.

  Further, the mold 2 configured in this manner is provided with a plurality of electrode insertion holes 2a, 2a,... Through which electrodes 32A described later are inserted and removed at predetermined intervals on the circumference. The electrode insertion hole 2 a is configured to have a downward slope toward the center side of the mold 2. For this reason, even if the molten metal M is contained in the mold 2, there is no possibility that the molten metal M leaks to the outside if the surface of the molten metal M is lower than the upper end opening of the electrode insertion hole 2a.

  As described above, simply, the stirring device 3 is provided in a built-in state with respect to the side wall of the mold 2. The stirring device 3 includes a permanent magnet type magnetic field generator 31 and a pair of upper electrodes (positive electrodes) 32A and lower electrodes (negative electrodes) 32B.

  The magnetic field generator 31 is configured in a ring shape (frame shape) as can be seen particularly from FIG. It is also possible to magnetize the entire circumference on the inner circumference side to the N pole and magnetize the entire circumference on the outer circumference side to the S pole. Further, the inner peripheral side and the outer peripheral side can be partially magnetized, for example, as shown in FIG.

  As will be described later, the magnetic field generator 31 does not necessarily have a ring shape, but is divided, for example, as shown in FIG. It can also comprise a magnet piece (FIG. 4). As described briefly above, this magnetic field generator 31 is incorporated in the external mold 22 as can be seen particularly from FIG.

  More specifically, as can be seen from FIG. 1A, the external mold 22 is provided with a magnetic field generator housing chamber 22a having a ring-shaped cross section with a release opening on the side wall. This magnetic field generator storage chamber 22a can also be seen from FIG. FIG. 2B shows the external mold 22 as viewed from below. In particular, as can be seen from FIG. 1 (a), the lower cross section is released to the ring-shaped magnetic field generator housing chamber 22a, and the same cross-section ring-shaped magnetic field generator 31 is moved from the lower position to the upper and lower positions. It is stored in an adjustable manner. That is, the magnetic field generator 31 is provided such that the height can be adjusted in the magnetic field generator storage chamber 22a by a desired means (not shown). Thereby, as can be seen from FIG. 1 (a), the height can be adjusted in accordance with the molten metal M in the liquid phase, and the molten metal M can be stirred more efficiently as described later. The opening below the magnetic field generator housing chamber 22a is closed by a ring-shaped lid 22B. The lid 22B can be configured to have a water discharge channel 22B (1) for draining the cooling water to the outside, as a lid 22B in FIG. 8A described later.

  As described above, the four portions of the magnetic field generator 31 are magnetized to form magnetic pole pairs 31a, 31a,... As shown in FIG. That is, regarding each magnetic pole pair 31a, 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. The molten metal M is passed horizontally. This and the magnetization may be reversed. That is, all the inside may be magnetized to a certain pole and all the outside may be magnetized to a different pole. One of the further features of the present invention is that a plurality of magnetic poles are arranged at a plurality of positions surrounding the molten metal M before solidifying, as can be seen from FIG. Thereby, as will be described later, the molten metal M can be uniformly stirred by the electromagnetic force of Fleming's law caused by the lines of magnetic force and current, and the quality of the product P can be improved. Therefore, although the number of magnetic poles is four in FIG. 3A, this number is not particular and any number may be used. In addition, as described above, the magnetic field generator 31 does not have to be configured as a single ring-shaped unit, and can be formed into an arbitrary number of a plurality of magnet bodies (magnet pieces) as shown in FIG. It may be divided.

  In FIG. 1A, an electric current flows between the pair of electrodes 32A and 32B through a molten metal M and a cast product (product) P. The number of electrodes 32A may be one, but may be plural, and in this embodiment, two. The electrode 32A has a probe shape. Each electrode 32A is inserted into the probe insertion hole 2a described above. That is, the electrode 32A penetrates the mold 2 (inner mold 21 and outer mold 22) from the water jacket 23, and the inner end is exposed in the inner mold 21 so as to be in contact with the molten metal M inside. The outer end is exposed to the outside of the water jacket 23. The outer end is connected to a power supply device 34 that can flow a variable DC current. As will be described later, the power supply device 34 may have an AC power supply function, and may have a frequency conversion function. The electrode 32A supports the inner end of the electrode 32A inserted into the molten metal M from the surface of the molten metal M flowing into the mold 2 above the upper opening of the mold 2 without penetrating the side wall of the mold 2. You can also. The electrode 32A can also be electrically connected to an internal mold 21 such as graphite.

  The electrode 32A may be used in any number, and any number of electrodes 32A may be inserted into any of the electrode insertion holes 2a, 2a,.

  In FIG. 1A, the lower electrode 32B is provided in a fixed position. The electrode 32B is configured as a roller type. That is, a rotatable roller 32Ba is provided at the tip. The roller 32Ba is in pressure contact with the outer surface of a cylindrical product P as a cast product (billet or slab) extruded in a solid phase, and is rotated as the product P extends downward. That is, when the product P is pushed downward, the product P extends 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 device 34, current flows between the pair of electrodes 32A and 32B via the molten metal M and the product P. As described above, the power supply device 34 is configured to be able to control the amount of current flowing between the pair of electrodes 32A and 32B. Thereby, the electric current which can stir the liquid phase state molten metal M most efficiently by the relationship with the said magnetic force line ML can be selected.

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

  In FIG. 1A, the molten metal M that has been metered out from the tundish (molten receiving box) 1 </ b> A enters the upper part of the mold 2. The mold 2 is cooled by the circulation of water in the water jacket 23, and the molten metal M in the mold 2 is rapidly cooled and solidified. However, the molten metal M in the mold 2 has a two-phase structure in which the upper part is a liquid (liquid phase) and the lower part is a solid (solid phase) and is in contact with the interface IT0. The molten metal M is molded into a shape (cylindrical in this embodiment) that matches the shape of the mold simultaneously with the passage of the mold 2, and is continuously made into a product P as a slab or billet.

  Thus, as can be seen from FIG. 1A and the like, a permanent magnet type magnetic field generator 31 is accommodated inside the side wall of the mold 2, and the magnetic field (lines of magnetic force ML) is laterally directed in the mold 2. The molten metal M has been reached. In this state, when a DC current is passed from the upper electrode 32A to the lower 32B by the power supply device 34, the current flows from the molten metal (liquid phase) M such as aluminum to the product (solid phase) from the upper electrode 32A to the lower electrode 32B. It flows through P. At this time, the current crosses the magnetic field lines ML from the permanent magnet type magnetic field generator 31 at a substantially right angle, and the molten metal M in the liquid phase is rotated according to Fleming's left-hand rule. In this way, the molten metal M is agitated, impurities, gas, etc. contained in the molten metal M rise, so-called degassing is actively performed, and the quality of the product (slab, billet) P can be improved.

  Now, when the cooling capacity is changed by the water jacket 23 or the like, the solidification rate of the molten metal M changes, and accordingly, the interface IT0 between the molten metal (liquid phase) M and the product (solid phase) P goes up and down. That is, when the cooling capacity is increased, the interface IT0 rises like the interface IT1 as shown in FIG. When the cooling capacity is weakened, the interface IT0 is lowered like the interface IT2 as shown in FIG. Thus, in order to efficiently stir the molten metal M, it is desirable to move the magnetic field generator 31 up and down according to the positions of the interfaces IT0, IT1, and IT2. Thereby, the molten metal M can be reliably and efficiently stirred to obtain the product P as a high quality product. Therefore, according to the height of these interfaces IT1 and IT2, the height of the magnetic field generator 31 can be adjusted up and down as shown in FIGS. It is said. Thereby, as mentioned above, the molten metal M can be stirred efficiently.

  Contrary to the above, the double structure of the mold 2 may be made of a conductive material on the inside and a non-conductive material on the outside. In this case, at least the electrode 32A may be in electrical contact with the inner conductive material. Even in this case, the magnetic field generator housing chamber 22a may be provided on the outer member.

  Moreover, the casting_mold | template 2 can also be made into a single structure, without setting it as a double structure. In this case, the mold 2 may be manufactured using 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 described above.

  Conversely, the mold 2 can be made of only a non-conductive material. In this case, as shown in FIG. 1A, the electrode 32A needs to be electrically connected to the molten metal M in the mold 2 by passing the electrode 32A through the mold 2 or the like.

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

  Instead of the magnetic field generator 31 of FIG. 3A, the magnetic field generator 31A of FIG. 3B can be used. The magnetic field generator 31A shown in FIG. 3B has a magnetization direction opposite to that of the magnetic field generator 31 shown in FIG. Both are functionally equivalent.

  Further, the magnetic field generators 31-2 and 31A-2 shown in FIGS. 4A and 4B may be used instead of the magnetic field generators 31 and 31A shown in FIGS. 3A and 3B. it can. The magnetic field generators 31-2 and 31A-2 shown in FIGS. 4A and 4B are configured by fixing a plurality of rod-shaped permanent magnets PM inside a ring-shaped support body (yoke) SP. Is done. These are functionally equivalent.

  Further, in the above-described embodiment, the lower electrode 32B has the roller 32Ba at the tip, but the roller 32Ba is not necessarily provided. Even if the product P is continuously extruded, it is sufficient that the product P and the electrode 32B are kept in an electrically conductive state, and various structures can be employed. For example, an elastic material having a predetermined length is used as the electrode 32B. In FIG. 1, for example, the electrode 32B is bent so as to be convex upward or convex downward, and the tip is made to the casting P by a restoring force. The casting P may be 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 agitated, moved to the molten metal M, and subjected to vibration or the like to achieve a degassing effect, a uniform structure, and a fine structure.

  More specifically, in the embodiment of the present invention, the magnetic field generator 31 can be adjusted up and down, so that the molten metal M can be reliably agitated to obtain a high-quality product P. This is one of the features of the present invention as described above, and a magnetic field externally attached to the mold in an apparatus that tends to be a high-temperature, large-sized apparatus and has almost no empty space as in the embodiment of the present invention. Since the idea of moving the generator 31 up and down is an idea that is not familiar to those skilled in the art, the technique of the present invention in which the magnetic field generator is housed in the mold and can be adjusted up and down is the present technology. This is a technical idea unique to the inventor.

  In the embodiment of the present invention, the magnetic field generator 31 is arranged with a plurality of magnetic poles at positions surrounding the molten metal M or a ring-shaped magnet surrounding the molten metal M. The molten metal M can be evenly stirred with high efficiency by electromagnetic force in accordance with Fleming's law by electric current, and the product P can be obtained as a high quality product. That is, in the embodiment of the present invention, the molten metal M can be efficiently stirred by making the best use of the electromagnetic force according to the Fleming's law. Moreover, 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. Thereby, the rotational drive of the molten metal M can be ensured, and a high quality product P can be obtained.

  Furthermore, in the embodiment of the present invention, the molten metal M is agitated by electromagnetic force in accordance with Fleming's law. Therefore, by cooperation between a small current flowing in the molten metal M and a magnetic field output from the magnetic field generator 31. Unlike the melting and stirring, which is performed by passing a large current intermittently according to the arc welding principle, etc., it is possible to expect stable and reliable stirring, low noise, and high durability. Can be obtained.

  Naturally, the above-described effects can be obtained for all the embodiments described below.

  In the above description, a direct current is caused to flow between the electrodes 32A and 32B, but an alternating current having a low cycle of about 1 to 5 Hz can also be passed from the power supply device 34. In this case, due to the relationship with the magnetic field from the magnetic field generator 31, the molten metal M repeats vibration according to its cycle, not rotation. This vibration also removes impurities from the molten metal M. This modification can also be applied to all embodiments described below. In this case, it is natural to employ a power supply device 34 having a frequency conversion function.

  Thus, at present, there is a demand for realization of mass production equipment in the industry. When considering mass production, it is indispensable to realize as small a mold as possible.

  Here, in the conventional electromagnetic stirring, it is possible to cope with the case where the number of slabs or billets produced at one time is several. Currently, however, there is a demand for simultaneous production of more than 100 billets. This request cannot be met by a conventional electromagnetic stirring device.

  However, in the apparatus of the present invention, a permanent magnet is used as the magnetic field generator. For this reason, compared with the electromagnetic stirring apparatus which flows a large current, it can be made very compact. This makes it possible to realize a mold apparatus for mass production equipment. In addition, since it is a permanent magnet type, a device that does not generate heat and has effects such as power saving, energy saving, and low maintenance can be obtained as a magnetic field generator.

  FIG. 5 shows a further different embodiment.

  A large amount of current is passed through the molten metal M in the liquid phase state to generate a larger electromagnetic force to drive the molten metal M to rotate.

  A difference from the embodiment of FIG. 1A is the structure of the mold 2A. Other configurations are substantially the same as those in FIG. Therefore, detailed description is not given here.

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

  This insulating layer portion is provided at a slightly lower portion of the inner surface of the mold body 2A1. Thereby, the current from the insulating layer portion in the mold body 2A1, that is, the portion in contact with the cast product P, to the cast product P is not allowed as much as possible.

  Further, a terminal 2A4 is provided on the outer peripheral side of the mold body 2A1. Power can be supplied from the power supply 34 to the mold 2A via the terminal 2A4.

  In the apparatus configured as described above, if a voltage is applied between the terminal 2A4 and the electrode 32B by the power supply device 34, a current flows through the mold body 2A1, the molten metal M, and the casting P. At this time, since no current flows through the insulating film 2A2 and the buried layer 2A3, a larger current flows through the molten metal M, and the electromagnetic force for stirring the molten metal M is obtained as a larger one.

  FIG. 6 shows yet another embodiment.

  This embodiment is a modification of the embodiment of FIG.

  This embodiment is different from the embodiment of FIG. 1A in the arrangement of the upper electrode 32A in FIG. In other words, in the present embodiment, one or a plurality of electrodes 32A0, 32A0,... Are arranged in an annular shape in the case of a plurality, and these electrodes 32A0 are arbitrary other than the mold 2A and the like (the mold 2A and the water jacket 23). The lower end portion of each electrode 32A0 is inserted into the molten metal M. Thus, the amount of insertion of the lower end portion of the electrode 32A0 into the molten metal M can be adjusted with a high degree of freedom regardless of the mold 2A and the like. Furthermore, naturally, what is necessary is just to use a normal thing as the casting_mold | template 2A etc., it is not necessary to provide the electrode insertion hole 2a in electrode 32A1 in casting_mold | template 2A etc., and the increase in these manufacturing costs can also be prevented.

  Other configurations are the same as those of the embodiment of FIG.

  FIG. 7 shows yet another embodiment.

  This embodiment can also be regarded as a modification of the embodiment of FIG.

  The embodiment of FIG. 7 assumes an apparatus that can be operated when the molten metal M is poured into the lower mold 2A from the upper tundish (molten metal receiving box) 1A as a continuous molten metal without being interrupted. . That is, it is assumed that the molten metal M in the tundish (molten receiving box) 1A and the molten metal M in the mold 2A are integrally connected.

  In FIG. 6, the electrode 32A0 is inserted into the molten metal M in the mold 2. However, in FIG. 7, the electrode 32A1 is arbitrarily inserted into the molten metal M in the tundish (molten receiving box) 1A on the assumption of the above case. It is supported by the means. By doing so, the same advantages as in the above-described embodiment of FIG. 7 can be obtained. In addition, the distance between the tundish (molten receiving box) 1A and the mold 2A can be set and adjusted regardless of the electrode 32A1.

  Other configurations are the same as those in FIG.

  8 (a)-(d), FIG. 9 (a)-(c), and FIG. 10 show still different embodiments of the present invention.

  In these embodiments, members that are the same as those described in the above embodiments are given the same reference numerals, and descriptions thereof are omitted.

  In these embodiments, without providing a cooling water jacket separately, on the side wall of the mold 2, that is, inside the side wall of the external mold 22, the water circulation chamber 22 a (2 serving as both a cooling chamber and a magnetic field generator storage chamber). ) And a magnetic field generator 31 as a permanent magnet is accommodated in the water circulation chamber 22a (2) so that the position thereof can be adjusted up and down.

  In addition, the magnetic field generator storage space (magnetic field generator storage chamber) 22a (2) shown in FIG. 8C stores a plurality of permanent magnet pieces 31A having a predetermined interval shown in FIG. Accordingly, a plurality of partial magnetic field generator storage chambers that are divided from each other, for example, having a circular cross section may be used.

  First, the billet manufacturing apparatus according to the embodiment shown in FIGS. 8A to 8E will be described.

  That is, as can be seen from FIG. 8 (a), the outer mold 22 includes a water circulation chamber 22a (2) having a ring-shaped cross section opened downward, and the water circulation chamber 22a (2) is covered with a lid 22B (1). ). FIG. 8B is a view of the inner mold 21 and the outer mold 22 viewed from below along the line VIII (b) -VIII (b) with the lid 22B (1) removed. The lid 22B (1) constitutes a part of the mold 2.

  As can be seen from FIG. 8 (a), a plurality of permanent magnet pieces 31A, 31A,... Having a circular arc cross section are provided in a ring-shaped water circulation chamber 22a (2) as a magnetic field generator storage space (storage chamber). A magnetic field generator 31 composed of (FIG. 8C) is housed so as to be adjustable up and down. 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. Each permanent magnet piece 31A has, for example, an N pole on the inside and an S pole on the outside. Conversely, it may be magnetized. That is, the magnetic field generator 31 is provided so that the height can be adjusted in the water circulation chamber 22a (2) by any means (not shown). Accordingly, as described above, the height is adjusted so as to correspond to the molten metal M in the liquid phase state, so that the molten metal M can be stirred more efficiently.

  The lower opening of the water circulation chamber 22a (2) is closed by the above-described ring-shaped lid 22B. A plan view of the lid 22B is shown in FIG. As can be seen from FIG. 8 (e) and FIG. 8 (a), a plurality of cooling water discharge channels 22B (1) are formed in the lid 22B (1). As can be seen from FIG. 8A and FIG. 8E, the plurality of water discharge channels 22B (1) have a plurality of inlets 22B (1) a1 opened on the upper surface of the lid 22B, and the peripheral side surface of the lid 22B. Has an outlet 22B (1) a2. Thereby, the cooling water in the water circulation chamber 22a (2) enters from the plurality of inlets 22B (1) a1, flows out of the outlet 22B (1) a2, and is injected onto the outer periphery of the product P to cool it. Become. That is, the cooling water enters the water circulation chamber 22a (2) from an inlet (not shown), circulates here while cooling, and is discharged to the outside from the water discharge passage 22B (1).

  Since the operation of the apparatus shown in FIGS. 8A to 8E described above is the same as that of the above-described embodiment, the description thereof is omitted.

  In the embodiment shown in FIGS. 8A to 8E described above, the magnetic field generator 31 is composed of a plurality of permanent magnet pieces 31A. However, as shown in FIG. Of course, it can be a figure. Moreover, although the water circulation chamber 22a (2) as the magnetic field generator storage space is configured as a circumferential shape as can be seen from FIG. 8B, it is not necessarily limited to this shape, and is divided in the circumferential direction. A plurality of cross sections may be configured as an arc-shaped cell chamber. It suffices if cooling water can be circulated in each cell chamber and the permanent magnet piece 31A can be stored so as to be movable up and down.

  In the apparatus shown in FIGS. 8A to 8E, the magnetic field generator 31 is not provided outside the mold 2 but a cavity (water circulation chamber 22a (2)) is provided in the mold 2 (external mold 22). Since the magnetic field generator 31 is housed in the cavity, the following characteristics can be obtained.

A small and small-capacity permanent magnet can be used as the magnetic field generator 31.
That is, when the magnetic field generator 31 is externally attached to the mold, it is inevitable that the distance between the magnetic field generator 31 and the molten metal M is slightly increased. However, in this embodiment, since it was built in the mold 2, when the distance between the magnetic field generator 31 and the molten metal M is reduced and the same stirring ability is provided, a smaller and smaller capacity permanent magnet is used. be able to.

-Workability can be greatly improved.
In other words, during the operation of this device, in order to perform a product check of the product P, a plurality of inspectors are positioned around this device to perform various measurements, non-destructive inspections, etc. Etc. must be done. However, in the case of an external magnetic field generator, it is inevitable that the apparatus is large and bulky, and a strong magnetic field is generated, so it cannot be denied that such a measurement operation is difficult. However, in this embodiment, since the magnetic field generator 31 is provided in the mold 2, not only is it bulky, but also the strength of the magnetic field radiated to the outside is reduced, and various measurements and the like are facilitated.

-Productivity can be greatly improved.
That is, since the time required for the above-described measurement can be shortened, the production speed of the product P per short time can be increased as a result.

-Miniaturization is possible.
That is, since the magnetic field generator 31 is a built-in type, the entire device can be provided in a small size.

-The installation space can be saved.
That is, the same as the above, but when viewed as an apparatus for manufacturing the same product P, since the magnetic field generator 31 is a built-in type, the overall size is reduced and can be installed in a narrow place, Flexibility is gained in the usefulness of the device.

  The above effects can be explained from another viewpoint as follows.

  When the product P is manufactured with this apparatus, for example, five or six workers gather around the apparatus, and the work is dense in a short time (monitoring and preventing molten metal leakage, monitoring the molten metal ejection, preventing work, etc. ) Is essential. When these operations are performed by a plurality of workers, the workability of the built-in device according to the present embodiment is better than the case where the magnetic field generator 31 protrudes externally. That is, the external appearance of the apparatus can be of the same dimension as that of the conventional apparatus that does not have the magnetic field generator 31, and the apparatus of the present embodiment is very convenient in the field.

  In order to make the magnetic field act on the molten metal M reliably, the magnetic field generator 31 should be as close as possible to the molten metal M, and this is realized in the built-in type.

  When the magnetic field generator 31 is externally attached, it is necessary to consider the influence of the magnetic field on various measuring instruments such as a temperature sensor, but the built-in type has less influence and is advantageous for measurement. That is, when manufacturing a product P such as a slab or billet, temperature measurement and management at a plurality of locations of the product P are extremely important issues in order to maintain the quality of the product. Such a temperature measurement is extremely advantageous in the present embodiment.

  Instead of an external magnetic field generator, if it is a built-in type as in this embodiment, the same magnetic field can be added to the molten metal M, and it can be small in size and weight, It can be easy to use. In other words, each component of the present apparatus is a consumable item and needs to be replaced as needed every certain period of operation time. However, since the magnetic field generator 31 and the like can be made small and light, replacement work and the like can be performed very easily.

  Since the operation of the apparatus according to the present embodiment is a high-temperature operation of about 700 ° C., it is extremely dangerous for the worker. However, it is possible to use a small magnetic field generator 31 that may have a slightly low magnetic field strength. Thus, the tools for adjusting and maintaining the apparatus are generally made of iron ferromagnetic material, and safety shoes are also made of iron, but the magnetic field of the magnetic field generator 31 radiated to the outside is a little. However, if it becomes weaker, the safety of security personnel, workers, measurers, etc. will be maintained.

  The effects described above with reference to FIGS. 8A to 8E are applied to the apparatus shown in FIG. 1 and the like, as well as to the apparatus for manufacturing the slabs shown in FIGS. 9A to 9C and FIG. It is natural to say that.

  9 (a)-(c) show an apparatus for manufacturing a slab, the basic technical concept is the same except that the billet is round, whereas the slab is square. is there. Accordingly, the same members are denoted by the same reference numerals and description thereof is omitted.

  The differences are as follows.

  In the slab, the weight of the product P is extremely heavy. For this reason, the billet can be pulled horizontally, but the slab must pull out the product P by vertical pulling. For this reason, the pedestal 51 is prepared, and the product P is taken out while being placed on the pedestal 51 and gradually being pulled downward. The lower electrode 32B is embedded in the pedestal 51. The magnetic field generator 31 is shown in FIGS. 9B and 9C. 9B is a cross-sectional view taken along line IX (b) -IX (b) in FIG. 9A, and FIG. 9C is a plan view of the magnetic field generator 31. Here, although the magnetic field generator 31 uses four permanent magnet pieces 31A as two sets facing each other, any one set may be used.

  FIG. 10 shows a modification of FIG.

  In FIG. 10, the pair of electrodes 32 </ b> A and 32 </ b> B is used while being inserted into the molten metal M. Thus, the present inventor confirmed through experiments that the molten metal M is stirred even when the electrodes 32A and 32B are used. That is, even if a pair of electrodes 32A and 32B are used as shown in FIG. 10, the magnetic field lines from the magnetic field generator 31 and the current flowing between the pair of electrodes 32A and 32B flow through the molten metal M through various paths. The electromagnetic force is generated by Fleming's law.

M Molten metal P Product (cast product)
DESCRIPTION OF SYMBOLS 1 Molten metal supply apparatus 2 Mold 2A Casting space 2A1 Inlet 2A2 Outlet 21 Internal mold 22 External mold 23 Water jacket 2a Electrode insertion hole 3 Stirrer 22a, 22a (2) Magnetic field generator storage chamber (magnetic field generator storage space)
31 Magnetic field generator 32A, 32A0, 32A1 Upper electrode 32B Lower electrode 32Ba Roller 34 Power supply

Claims (20)

A casting apparatus for continuous casting with a stirrer that receives a supply of a molten metal in a liquid phase state of a conductive material and is capable of taking out a cast product in a solid phase by cooling the molten metal,
A casting space having an inlet and an outlet on the center side of the substantially cylindrical side wall; and a magnetic field generator housing chamber formed inside the side wall and positioned outside the casting space. Receiving a supply of the molten metal in the liquid phase from the inlet to the casting space, and discharging the casting in the solid phase from the outlet by cooling in the casting space;
A stirrer provided corresponding to the mold, wherein the first electrode and the second electrode can flow a direct current or an alternating current of 1 to 5 Hz through the molten metal in a liquid phase state in the casting space. An electrode section having electrodes, and a magnetic field generator having a permanent magnet for applying a magnetic field to the molten metal in a liquid phase state, the magnetic field generator being housed in the magnetic field generator housing chamber of the mold. The magnetic lines of force can be generated laterally toward the center direction, the magnetic lines of force can penetrate a part of the side wall of the mold to reach the casting space, and the lateral lines of magnetic force intersecting the current can be given to the molten metal. Comprising a stirring device;
With
The magnetic field generator storage chamber is formed as an opening opened downward in the side wall of the mold,
The opening of the magnetic field generation device storage chamber is closed by a lid, and the magnetic field generation device storage chamber is configured to also serve as a cooling chamber that allows circulation of cooling water.
A casting apparatus for continuous casting with a stirring device. A casting apparatus for continuous casting with a stirrer that receives a supply of a molten metal in a liquid phase state of a conductive material and is capable of taking out a cast product in a solid phase by cooling the molten metal,
A casting space having an inlet and an outlet on the center side of the substantially cylindrical side wall; and a magnetic field generator housing chamber formed inside the side wall and positioned outside the casting space. Receiving a supply of the molten metal in the liquid phase from the inlet to the casting space, and discharging the casting in the solid phase from the outlet by cooling in the casting space;
A stirrer provided corresponding to the mold, wherein the first electrode and the second electrode can flow a direct current or an alternating current of 1 to 5 Hz through the molten metal in a liquid phase state in the casting space. An electrode section having electrodes, and a magnetic field generator having a permanent magnet for applying a magnetic field to the molten metal in a liquid phase state, the magnetic field generator being housed in the magnetic field generator housing chamber of the mold. The magnetic lines of force can be generated laterally toward the center direction, the magnetic lines of force can penetrate a part of the side wall of the mold to reach the casting space, and the lateral lines of magnetic force intersecting the current can be given to the molten metal. Comprising a stirring device;
With
The magnetic field generator is provided in the magnetic field generator storage chamber so that the position can be adjusted up and down according to the position of the interface between the liquid-phase molten metal and the solid-phase product in the casting space. Yes,
A casting apparatus for continuous casting with a stirring device. A casting apparatus for continuous casting with a stirrer that receives a supply of a molten metal in a liquid phase state of a conductive material and is capable of taking out a cast product in a solid phase by cooling the molten metal,
A casting space having an inlet and an outlet on the center side of the substantially cylindrical side wall; and a magnetic field generator housing chamber formed inside the side wall and positioned outside the casting space. Receiving a supply of the molten metal in the liquid phase from the inlet to the casting space, and discharging the casting in the solid phase from the outlet by cooling in the casting space;
A stirrer provided corresponding to the mold, wherein the first electrode and the second electrode can flow a direct current or an alternating current of 1 to 5 Hz through the molten metal in a liquid phase state in the casting space. An electrode section having electrodes, and a magnetic field generator having a permanent magnet for applying a magnetic field to the molten metal in a liquid phase state, the magnetic field generator being housed in the magnetic field generator housing chamber of the mold. The magnetic lines of force can be generated laterally toward the center direction, the magnetic lines of force can penetrate a part of the side wall of the mold to reach the casting space, and the lateral lines of magnetic force intersecting the current can be given to the molten metal. Comprising a stirring device;
With
The first electrode and the second electrode are connected to a power supply device capable of passing an alternating current between them.
A casting apparatus for continuous casting with a stirring device. A casting apparatus for continuous casting with a stirrer that receives a supply of a molten metal in a liquid phase state of a conductive material and is capable of taking out a cast product in a solid phase by cooling the molten metal,
A casting space having an inlet and an outlet on the center side of the substantially cylindrical side wall; and a magnetic field generator housing chamber formed inside the side wall and positioned outside the casting space. Receiving a supply of the molten metal in the liquid phase from the inlet to the casting space, and discharging the casting in the solid phase from the outlet by cooling in the casting space;
An agitation device provided corresponding to the mold, wherein at least an electrode portion having a first electrode and a second electrode capable of flowing a current in the molten metal in a liquid phase state in the casting space; A magnetic field generator having a permanent magnet for applying a magnetic field to the molten metal in a phase state, the magnetic field generator being housed in the magnetic field generator housing chamber of the mold and being laterally directed toward the center direction. A stirrer configured to generate magnetic lines of force, to pass the magnetic lines of force through a part of the side wall of the mold to reach the casting space, and to give the molten metal lateral magnetic lines that intersect the current; ,
With
The magnetic field generator storage chamber is configured to also serve as a cooling chamber that allows cooling water to flow.
A casting apparatus for continuous casting with a stirring device.   4. The mold apparatus for continuous casting with a stirrer according to claim 2 or 3, wherein the magnetic field generator storage chamber is configured to also serve as a cooling chamber that allows the flow of cooling water. . The magnetic field generator is provided in the magnetic field generator storage chamber so that the position can be adjusted up and down according to the position of the interface between the liquid-phase molten metal and the solid-phase product in the casting space. The continuous casting mold apparatus with a stirrer according to claim 1 or 4 .   The continuous water with a stirrer according to any one of claims 1, 5 and 6, wherein a water discharge passage for injecting cooling water flowing in the magnetic field generator storage chamber toward the product is formed in the mold. Casting mold equipment.   The said power supply device is provided with the frequency conversion function, The casting_mold | template apparatus for continuous casting with a stirring apparatus of Claim 3 characterized by the above-mentioned.   8. The power source device capable of passing a direct current between the first electrode and the second electrode is connected between the first electrode and the second electrode. Continuous casting mold device with stirring device.   The continuous with stirrer according to any one of claims 1 to 9, wherein the magnetic field generator storage chamber is formed inside a side wall of the mold and at an outer peripheral position of the casting space. Casting mold equipment.   11. The continuous casting with a stirrer according to claim 1, wherein the magnetic field generator storage chamber is formed in a frame shape so as to surround the entire circumference of the casting space. Mold device.   The magnetic field generation device storage chamber is configured to include a plurality of independent partial magnetic field generation device storage chambers each partitioned, and each partial magnetic field generation device storage chamber surrounds a part of the entire circumference of the casting space. 11. The continuous casting mold apparatus with a stirring device according to claim 1, wherein the casting casting mold apparatus is formed as a thing.   12. The agitation according to claim 11, wherein the magnetic field generator has a frame-like cross section, the inner circumference is magnetized to the first pole, and the outer circumference is magnetized to the second pole. Mold equipment for continuous casting with equipment.   The magnetic field generator includes a support having a frame-like cross section, and a plurality of permanent magnet pieces attached to the inner surface of the support at predetermined intervals, and each of the permanent magnet bodies is magnetized on the inner surface side and the outer surface side. The continuous casting mold apparatus with a stirring device according to claim 11.   12. The casting apparatus for continuous casting with a stirrer according to claim 11, wherein the magnetic field generator includes a plurality of permanent magnet pieces, and the plurality of permanent magnet pieces are stored in the magnetic field generator storage chamber at predetermined intervals. .   13. The continuous casting mold apparatus with a stirrer according to claim 12, wherein the magnetic field generator includes a plurality of permanent magnet pieces, and each of the plurality of permanent magnet pieces is stored in the partial magnetic field generator storage chamber.   The first electrode is provided so as to be electrically conductive with a molten metal in a liquid phase in the mold or with a molten metal or other parts electrically connected to the molten metal, and the second electrode is taken out from the mold. The continuous casting mold apparatus with a stirrer according to any one of claims 1 to 16, wherein the mold apparatus is provided so as to be electrically conductive with a solid phase product.   The said 1st electrode and the said 2nd electrode are both provided so that electrical conduction with the molten metal of the liquid phase state in the said casting_mold | template is possible, The one of Claim 1 thru | or 16 characterized by the above-mentioned. Molding device for continuous casting with stirring device.   2. The mold according to claim 1, wherein the mold has a single structure made of a non-conductive material, a single structure made of a conductive material, or a double structure made of a non-conductive material and a conductive material. A mold apparatus for continuous casting with a stirring device according to any one of 1 to 18. 21. One of claims 1 to 17 and 19 , wherein the second electrode is provided with a roller at the tip, and the roller is configured to be rotatable by contact with an outer surface of the cast product to be taken out. The casting apparatus for continuous casting with the stirrer.

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