JP5669509B2 - Molding device for continuous casting with stirring device - Google Patents

Description

  The present invention is a continuous caster with a stirrer in a continuous casting facility for producing non-ferrous metal billets or slabs of conductors (conductors) such as Al, Cu, Zn or at least two alloys thereof, or Mg alloys. The present invention relates to a casting mold apparatus.

  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 mold that receives the supply of the molten metal in the liquid phase state from the inlet side, and discharges the cast product in the solid phase state from the outlet side by cooling,
A stirring device provided outside the mold, wherein a magnetic field is applied to the electrode portion having a first electrode located above and a second electrode located below the first electrode, and the molten metal in a liquid phase state. A magnetic field generator having a permanent magnet for the first electrode is provided so as to be electrically conductive with the molten metal in a liquid phase state, and the second electrode is in a solid phase state with the cast product. The first electrode and the second electrode are configured to be electrically conductive between the first electrode and the second electrode via the molten metal and the casting, and the magnetic field generator is disposed outside the mold. Configured to generate magnetic lines of force in the horizontal direction, and pass the magnetic lines through the mold to reach the inside of the molten metal to give the horizontal lines of magnetic force intersecting the current,
Configured as a thing.

1 is an overall configuration diagram of an embodiment of the present invention. Plane explanatory drawing seen along the II-II line | wire of FIG. (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.

  In order to deepen the understanding of the embodiment of the present invention, an electromagnetic stirring device 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, there are two molten metals, ie, a molten metal in a liquid (liquid phase) state and a casting in a solid (solid phase) state at the same time. 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 has been used for this stirring.

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

  Therefore, the present invention intends to provide a continuous casting mold apparatus with a stirrer that does not use the electromagnetic stirrer.

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

  The apparatus according to the embodiment of the present invention is roughly divided into Al, Cu, Zn, at least two alloys thereof, or a molten metal supply M for supplying a nonferrous metal melt M of a conductor (conductor) such as an Mg alloy. It has the apparatus 1, the casting_mold | template 2 which receives a molten metal from the molten metal supply apparatus 1, and the stirring apparatus 3 which stirs the molten metal M in the casting_mold | template 2. FIG.

  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 receiving box) 1A, inclusions are removed, and the molten metal M is supplied from below 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.

  For this reason, this casting_mold | template 2 is comprised roughly as a cylindrical structure of a double structure. That is, an internal mold 21 made of an inner non-conductive material (non-conductive refractory material) and an outer mold 22 made of an outer conductive material (conductive refractory material) are provided.

  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, the cooling water is circulated in the water jacket 23 and the outside of the external mold 22 is cooled by this cooling 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.
The stirring device 3 is provided for 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.

  As can be seen from FIG. 3A in particular, the magnetic field generator 31 is configured in a ring shape and is installed in a state of being directly or indirectly fitted to the outer periphery of the water jacket 23.

  The ring-shaped magnetic field generator 31 is configured to be vertically adjustable with respect to the water jacket 23 (mold 2). As a result, the position where the stirring efficiency is the highest with respect to the mold 2 can be selected by adjusting the vertical position of the magnetic field generator 31. Four portions of the magnetic field generator 31 are magnetized to form magnetic pole pairs 31a, 31a,. That is, for each of the magnetic pole pairs 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 lines ML emitted from the N pole pass through the molten metal M inside the mold 2 horizontally. And enter the S pole.

  A current flows between the pair of electrodes 32A and 32B through the molten metal M and the 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. 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 may be used in any number, and any number of electrodes 32A may be inserted into any of the electrode insertion holes 2a, 2a,.

  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 away, the product P extends downward in FIG. 1 while rotating the roller 32Ba while keeping the 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.

  The molten metal M discharged from the tundish (molten metal receiving box) 1A 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). 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, a permanent magnet type magnetic field generator 31 is disposed outside the mold 2, and the magnetic field (lines of magnetic force ML) reaches the molten metal M in the mold 2 sideways. 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.

  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.

  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. 1, it is necessary to electrically connect the electrode 32 </ b> A to the molten metal M in the mold 2 by passing the electrode 32 </ b> A through the mold 2.

  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 present invention, the molten metal M immediately before solidification is stirred, moved to the molten metal M, and vibrations are applied to achieve a degassing effect, a uniform structure, and miniaturization.

  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, it can be made extremely compact as compared with the electromagnetic stirring device. 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.

  The difference from the embodiment of FIG. 1 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 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 FIG. 5, the water jacket is not shown.

  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. 1 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 operate when the molten metal M is poured from the upper tundish (molten receiving box) 1A into the lower mold 2 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 2 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.

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

Claims (16)

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 mold that receives the supply of the molten metal in the liquid phase state from the inlet side, and discharges the cast product in the solid phase state from the outlet side by cooling,
A stirring device provided outside the mold, wherein a magnetic field is applied to the electrode portion having a first electrode located above and a second electrode located below the first electrode, and the molten metal in a liquid phase state. A magnetic field generator having permanent magnets for
With
The first electrode is provided to be electrically conductive with the molten metal in a liquid phase state, and the second electrode is provided to be electrically conductive with the casting in a solid phase state, the first electrode and The second electrode is configured to be able to energize in the vertical direction between the molten metal and the cast product between them, the magnetic field generator is provided outside the mold, generates a magnetic line of force in the lateral direction, It is configured such that it can pass through the mold to reach the inside thereof and give the molten metal a horizontal magnetic field line that intersects the current,
The magnetic field generator includes a plurality of permanent magnet body consisting of S and N poles, each pole are ized magnetic respectively as the side near and far side inner magnetic pole respectively outer pole in the mold,
The plurality of permanent magnet bodies are arranged around a longitudinal axis and on the outer periphery of the mold,
In each of the permanent magnet bodies, the inner magnetic pole is an S pole and the outer magnetic pole is an N pole, or the inner magnetic pole is an N pole and the outer magnetic pole is an S pole. The mold apparatus for continuous casting with a stirring device according to claim 1.   The said magnetic field generator is comprised as what can adjust a position to an up-down direction with respect to the said casting_mold | template, The casting_mold | template apparatus for continuous casting with a stirring apparatus of Claim 1 characterized by the above-mentioned.   The continuous casting mold apparatus with a stirring device according to claim 1 or 2, wherein the first electrode is supported by the mold. The second electrode is provided with a roller at the tip, the roller is the possible features that the mounting serial to one of claims 1 to 3 that is configured as rotatable by contact with the casting of the outer surface to be retrieved Continuous casting mold device with stirring device. Claim 1 for continuous casting with serial mounting of the stirring device to one of the 4 DC current flows may power device is characterized in that connected between them to the first electrode and the second electrode Mold 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. or one in serial mounting continuous casting mold apparatus with a stirring apparatus 5. The mold is configured as a single structure made of a non-conductive material, and the first electrode is provided so as to be exposed to the inside of the mold through an electrode insertion hole provided in a through state in the mold. The mold apparatus for continuous casting with a stirring device according to claim 3. The mold is constructed as a singlet structure with a conductive material, continuous with stirrer according to claim 3 wherein the first electrode is characterized in that provided in the state of electrical continuity with the previous SL mold Casting mold equipment. The mold is configured as a double structure of an inner non-conductive material and an outer conductive material, and the first electrode passes through an electrode insertion hole provided in a penetrating manner in the mold, and the interior of the mold The mold apparatus for continuous casting with a stirrer according to claim 3, wherein the mold apparatus is provided so as to be exposed to the surface. The template is configured as a double structure of the inner conductive material and an outer electrically non-conductive material, the first electrode is small and also electrostatic Gokusa Komiana said inner conductive material and electrically via The continuous casting mold apparatus with a stirring device according to claim 3, wherein the casting apparatus is provided in a conductive state.   11. The casting apparatus for continuous casting with a stirrer according to claim 1, wherein the magnetic field generator is configured as an annular body. The magnetic field generating apparatus wherein the annular body stirred continuous casting mold device with apparatus of claim 11, few plants double is characterized in that it is with the permanent magnet body. The magnetic field generator includes a ring-shaped support and the a support which is fixed to the multiple permanent magnet body, stirrer with continuous casting mold according to claim 11, characterized in that it comprises a. 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 mold made of a conductive material, which is supplied with the molten metal in the liquid phase state from the inlet side, and discharges the casting in the solid phase state from the outlet side by cooling,
A stirring device provided outside the mold, comprising a magnetic field generator having a permanent magnet for applying a magnetic field to the molten metal in a liquid phase state, and electrically connected to the cast product in a solid phase state A lower electrode that can be conducted to the current , and thereby a current flows from the mold through the molten metal and the casting to the lower electrode, and the magnetic field generator is provided outside the mold. Is configured to generate magnetic lines of force in the horizontal direction, the magnetic lines of force penetrate the mold and reach the inside thereof, and can give the horizontal lines of magnetic force intersecting the current to the molten metal,
The magnetic field generator has a plurality of permanent magnet bodies composed of S poles and N poles, and each magnetic pole is magnetized as an inner magnetic pole and an outer magnetic pole on the side closer to and far from the mold, respectively.
The plurality of permanent magnet bodies are arranged around a longitudinal axis and on the outer periphery of the mold,
In each of the permanent magnet bodies, the inner magnetic pole is an S pole and the outer magnetic pole is an N pole, or the inner magnetic pole is an N pole and the outer magnetic pole is an S pole.
A casting apparatus for continuous casting with a stirring device. The inner surface of the mold is partitioned into an electrically conductive surface by an inner surface of the upper mold itself and an electrically insulating surface covered by a lower insulating film, and is separated from the mold by the conductive surface. 15. With a stirrer according to claim 14, wherein a current flow to the molten metal is allowed and a current flow from the mold to at least the casting is blocked by the insulating film. melting furnace.   The mold apparatus for continuous casting with a stirrer according to claim 14, wherein the magnetic field generator is configured to be capable of adjusting the position in the vertical direction with respect to the mold.

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