JP2013119096A - Metal product manufacturing apparatus, metal product manufacturing method, and rotary magnetic field generation system for stirring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide: a metal product manufacturing apparatus, which is inexpensive, is easy to maintenance, requires less running cost, and is easily installed; a metal product manufacturing method; and a rotary magnetic field generation system for stirring.SOLUTION: By rotating a magnetic field generation device having a plurality of magnetic poles around a first axis along a pulling-out direction of a mold 30 so as to make different poles alternately line up around the rotary magnetic field generation system 10 arranged in the vicinity of an outlet of the mold 30 having an internal space for cooling up molten metal, the molten metal in a semifinished product is rotated around a second axis being parallel with the first axis by moving output magnetic force lines that come out from respective magnetic poles or input magnetic force lines that enter respective magnetic poles while they penetrate the molten metal in the semifinished product.

Description

  The present invention relates to a metal product manufacturing apparatus, a metal product manufacturing method, and a rotating magnetic field generator for stirring.

  In order to produce billets, slabs, etc. of non-ferrous metals such as Al, Cu, Zn or at least two of these alloys, or conductors (conductors) such as Mg alloys, or other metals Therefore, it is desirable to stir the molten metal as a raw material. Thus, a conventional electromagnetic stirrer is installed outside the mold mold to stir the molten metal in the mold, or a mechanical pump is submerged inside the mold to circulate and stir the molten metal in the furnace. was there. However, the electromagnetic stirrer has a complicated maintenance, is expensive, has a high running cost, and is not very popular for these reasons. In addition, the mechanical pump has problems such as severe damage to rotating blades (made of carbon) as a constituent member and high running cost.

  From another point of view, the billet production apparatus includes an ultrasonic type apparatus and an electromagnetic coil that applies a high frequency magnetic field to apply electromagnetic vibration to the molten metal in the billet. However, these have problems such as a high running cost and a very poor workability, resulting in a failure to obtain the intended productivity. In the slab production apparatus, the actual situation is that there is no effective stirring means due to the large size of the slab.

  As described above, all the conventional methods have many problems and have not spread as a result.

  The present invention is intended to solve the problems of these conventional methods, and to provide a metal product manufacturing apparatus, a metal product manufacturing method, and a rotating magnetic field generator for agitation that are easy to install, inexpensive, easy to maintain, and low in running cost. Is.

The metal product manufacturing apparatus of the present invention comprises:
A mold for receiving and cooling a molten metal, comprising an inlet for receiving the molten metal, an internal space for cooling communicating with the inlet, and an outlet communicating with the internal space, A mold that is cooled from the outer peripheral side in the space, solidified from the outside and the molten metal remains inside, and is drawn out from the outlet as a semi-finished product in which the inner liquid phase and the outer solid phase form an interface. When,
A rotating magnetic field generator provided in the vicinity of the outlet, comprising: a magnetic field generator having an arbitrary number of magnetic pole pairs by providing a plurality of magnetic poles so that different polarities are alternately arranged around the outlet; Is provided so as to be rotatable around a first axis along the direction of the lead-out, and passes through the molten metal in the semi-finished product through the output magnetic field lines coming out of the magnetic poles or the input magnetic field lines entering the magnetic poles. A rotating magnetic field generator for rotating the molten metal in the semi-finished product around a second axis lined on the first axis;
It is comprised as provided with.

The metal product manufacturing method of the present invention comprises:
Supplying a molten metal to an inlet communicating with the internal space of the mold having an internal space for cooling;
In the internal space of the mold, the supplied molten metal is cooled from the outer peripheral side, so that the molten metal is solidified from the outside and the molten metal remains inside, and the inner liquid phase and the outer solid phase form an interface. In the product state, pull out from the outlet communicating with the internal space,
A magnetic field generator having a plurality of magnetic poles is rotated around a first axis along the direction of drawing from the mold so that different polarities are alternately arranged around the rotating magnetic field generator provided in the vicinity of the outlet. By moving the output magnetic field lines coming out of the magnetic poles or the input magnetic field lines entering the magnetic poles in a state of passing through the molten metal in the semi-finished product, the molten metal in the semi-finished product is moved to the first It is configured to rotate around a second axis lined up with the axis.

The rotating magnetic field generator for stirring of the present invention is
An inlet that receives the molten metal, an internal space for cooling that communicates with the inlet, and an outlet that communicates with the internal space. The molten metal is cooled from the outer peripheral side in the internal space and is solid from the outside. For the stirring provided in the vicinity of the outlet of the mold, the molten metal remains inside, and the mold is drawn out from the outlet as a semi-finished product in which the inner liquid phase and the outer solid phase form an interface. A rotating magnetic field generator,
A magnetic field generator having an arbitrary number of magnetic pole pairs is provided by providing a plurality of magnetic poles so that different poles are alternately arranged around the periphery, and the magnetic field generator rotates around a first axis along the direction of the extraction An output magnetic force line that is provided so as to be driven, or an input magnetic force line that enters the magnetic pole is moved in a state of passing through the molten metal in the semi-finished product, and the molten metal in the semi-finished product is Configured to rotate around a second axis aligned with the first axis;
Furthermore, it comprises a magnetic shielding means that covers a part of the entire circumference around the first axis of the magnetic field generator, and is configured to shield the output magnetic field lines from the magnetic field generator with the magnetic shielding means. The
Configured as a thing.

BRIEF DESCRIPTION OF THE DRAWINGS Front explanatory drawing of the magnetic field generator of one Embodiment of this invention. FIG. 3 is an explanatory diagram on the right side of the apparatus of FIG. 1. Side surface explanatory drawing of the magnetic field generator in the apparatus of FIG. Side surface explanatory drawing of the magnetic field generator which shows the different example of FIG. (A) is an overall configuration diagram of a billet production apparatus (metal product production apparatus) that produces one billet incorporating the apparatus of FIG. 1, (b) is an explanatory view showing details of a mold and a product, (c) is Cross-sectional explanatory drawing along 5 (c) -5 (c) of (a). (A) is longitudinal section explanatory drawing of a mold, (b) is transverse explanatory drawing. Explanatory drawing which shows the different interface of a product. Explanatory drawing explaining the movement by the temperature of the gas in the molten metal of a product. Explanatory drawing explaining the movement by rotation of the molten metal of the gas in the molten metal of a product. The whole block diagram of the billet production apparatus which produces two billets incorporating the apparatus of FIG. The whole block diagram of the billet production apparatus which produces four billets incorporating the apparatus of FIG. The whole block diagram of the slab production apparatus which produces one slab incorporating the apparatus of FIG. The whole block diagram of the different example of the billet production apparatus which produces the slab which incorporated one apparatus of FIG. The whole block diagram of the large-sized furnace which incorporated one apparatus of FIG. The whole block diagram of the large sized furnace which incorporated two apparatuses of FIG.

  A rotating magnetic field generator 10 incorporated in a metal product manufacturing apparatus 100 including a magnetic shielding metal melt stirring device according to an embodiment of the present invention will be described with reference to FIG. 1 (front explanatory view) and FIG. 2 (side explanatory view). To do.

  Referring to FIG. 1, a rotating magnetic field generator 10 includes a frame 1 having a cylindrical magnetic field generator 2 having a horizontal axis in the figure, and an axis (first axis ax1) formed by the two axes 2a and 2a. It is attached so that it can rotate around. In this magnetic field generator 2, as can be seen from FIG. 3, two busbar portions facing each other in the diametrical direction across the axis are magnetized to N and S poles to form one magnetic pole pair. The number of magnetic pole pairs may be two or more, and FIG. 4 shows an example of two magnetic pole pairs. The magnetic field generator 2 may be an electromagnet.

  The magnetic field generator 2 is rotationally driven by a motor 3 attached to the frame 1 via a winding conduction mechanism 5. That is, the rotation of the motor 3 is decelerated and transmitted to the magnetic field generator 2. This winding conduction mechanism 5 is covered with a cover 1A. Here, a chain and a sprocket are used as the winding conduction mechanism 5. However, the present invention is not limited to this, and other conduction mechanisms may be used. Moreover, even if it is not the said winding conduction mechanism, what is necessary is just to be able to decelerate rotation of the motor 3 and to be transmitted to the magnetic field generator 2, even if it is another mechanism. For example, a coupling connection in which the motor 3 and the magnetic field generator 2 are arranged on the same horizontal line in the drawing and connected via a speed reducer may be used. Further, the motor 3 itself may be provided with a speed reduction mechanism.

  In particular, as can be seen from FIG. 2, a shield plate (magnetic shielding means) 7 for magnetically shielding the upper half of the periphery of the columnar magnetic field generator 2 is provided in the frame 1 in the vicinity of the magnetic field generator 2. Is provided. In the cross section, the shield plate 7 has a semicircular shield part 7a in the upper half, and a release part 7b in which the lower half spreads outward. 3, the upper space US and the left and right spaces LS / RS of the shield plate 7 in FIG. 3 among the outer peripheral space of the magnetic field generator 2 are magnetically shielded and magnetically released only to the lower space DS. Thus, a magnetic field is formed in the lower space DS by the magnetic lines of force ML. In simple terms, the shield around the magnetic field generator 2 is 180 degrees. The shield part 7a is made of a magnetic material, and the release part 7b is made of a non-magnetic material. The release angle of the lower space DS in the shield plate 7 is not limited to the illustrated one, and may be an arbitrary angle. That is, the magnetic field lines ML (output magnetic field lines) emitted from the N pole of the magnetic field generator 2 are shielded by the shield plate 7, and the magnetic field lines (input magnetic field lines) directed to the S pole are shielded by the shield plate 7.

  In the rotating magnetic field generator 10 described above, the shield plate 7 is magnetically shielded except for the lower space DS of the magnetic field generator 2. That is, when the magnetic field generator 2 is rotated by the motor 3, the upper space US and the left and right spaces LS / RS are magnetically shielded by the shield plate 7, and only the magnetic lines ML directed to the lower space DS rotate in the lower space DS.

  Fig.5 (a) shows the metal product manufacturing apparatus 100 provided with the magnetic shielding type molten metal stirring apparatus incorporating the rotating magnetic field generator 10 demonstrated above. In FIG. 5A, simply, the molten metal M in the liquid phase (liquid) state from the supply rod 20 is taken out as a product (billet) P in the solid phase (solid) state by the mold 30. In FIG. 5A, the product (billet) P is taken out horizontally, but it can be taken out vertically.

  More specifically, the supply rod 20 that stores the molten metal M is connected to the mold 30 via the connection rod 22. Details of the mold 30 are shown in FIGS. 6 (a) and 6 (b). FIG. 6A is a longitudinal section along the paper surface of the mold 30, and FIG. 6B is a longitudinal section perpendicular to the paper surface. That is, the mold 30 has a cylindrical internal space 30a at the center and a plurality of water jets 30b, 30b,. Therefore, the molten metal M flows into the internal space 30a from the inlet 30a1, is rapidly cooled with water from the water jets 30b, 30b,... Become. The supply rod 20 and the connection rod 22 constitute a molten metal supply assembly.

  Thus, as can be seen from FIG. 5 (b), the product (billet) P is solidified by cooling on the outside and is in the solid phase (solid state), while the molten metal M is in the liquid phase (liquid) inside. It is in. An embodiment of the interface I between the liquid phase and the solid phase is shown in FIG. That is, the interface I takes a so-called parabolic shape in which the right side in FIG. 5B is opened. As will be described later, the temperature distribution of the molten metal M is high in the vicinity of the inlet 30a1 and low in the vicinity of the top of the parabola.

  More specifically, in general, the product (billet) P takes a two-phase state of a liquid phase and a solid phase as shown in FIG. Their interfaces I are parabolic. That is, for example, the molten metal M is rapidly cooled and solidified by water from the water outlets 30b, 30b,. Solidification starts from the surface portion (outer peripheral portion). Since it takes time to cool the product (billet) P to the central portion, the central portion is solidified last. Thus, a parabolic interface I is formed. In this case, the temperature of the molten metal M is low near the apex of the parabola and high near the inlet 30a1. Here, for the sake of convenience, it has been described that the product (billet) P is pulled out from the outlet 2A (1) 2, but correctly, the portion where the solid phase and the liquid phase are mixed should be called a semi-finished product. The product with the liquid phase part completely solidified is the product.

  In addition, if the cooling capacity of the molten metal M in the mold 30 is increased, the sharpness of the parabola at the interface I is reduced, and conversely, if the cooling capacity is lowered, the sharpness is increased. Moreover, if the drawing speed of the product (billet) P is slowed down, the sharpness decreases, and if it is accelerated, the sharpness increases.

  In FIG. 5 (a), the rotating magnetic field generator 10 is installed above the outlet side of the mold 30, that is, above the molten metal M in a liquid phase with the interface I interposed therebetween. The vertical positional relationship between the rotating magnetic field generator 10 and the product (billet) P is shown in FIG. FIG. 5C is a cross-sectional view taken along the line c-c ′ in FIG. In Fig.5 (a), the rotating magnetic field generator 10 can also be provided so that a movement to the right and left is possible. Thereby, the rotating magnetic field generator 10 can be moved to a more suitable position above the molten metal M in the liquid phase state shown in FIG.

  Magnetic field lines ML from the magnetic field generator 2 of the rotating magnetic field generator 10 pass through the interface I and reach the molten metal M inside. Therefore, when the magnetic field generator 2 rotates, the magnetic lines of force ML move in a state of penetrating the molten metal M. Thereby, an eddy current is generated in the molten metal M in the liquid phase state, and the molten metal M is rotated and stirred around the horizontal axis (second axis ax2) in FIG. 5A by electromagnetic force. By this stirring, the take-out speed of the product (billet) P can be increased, impurities in the molten metal M can be efficiently removed, and the product (billet) P can be improved.

  Below, the effect | action, advantage, etc. in the case of stirring the molten metal M in a liquid phase state by embodiment of this invention are demonstrated.

Improving the cooling rate (solidification rate) of the melt M By stirring the melt M, the cooling and solidification rate of the melt M can be increased as shown in FIG. That is, when stirring is not performed, the interface between the molten metal M and the product (billet) P becomes an interface I (1) indicated by a dotted line. This is because the heat transfer from the central portion of the molten metal M to the outer peripheral portion is gentle when stirring is not performed. However, when the molten metal M is stirred, the way of heat transfer becomes smooth, and the interface becomes the solid interface I (2). As can be seen from the comparison between the interface I (1) and the interface I (2), the drawing speed of the product (billet) P can be increased.

Degassing effect from the molten metal (a) Gas movement due to the temperature and specific gravity of the molten metal The gas G entrained in the molten metal rises by buoyancy over time and escapes into the atmosphere. This is because there is a pressure difference between the lower part (bottom part) and the upper part (surface) of the molten metal, and the gas moves upward at a low pressure.

  The movement of the gas also takes the same behavior as described above depending on the temperature difference of each part of the molten metal M. That is, when the temperature of the molten metal is high, the specific gravity of the molten metal is small, and when the temperature is low, the specific gravity is large. For example, a molten aluminum having a temperature of 700 ° C. has a specific gravity of 2.4, a solid (normal temperature) of 2.7, and the temperature between them is roughly proportional to the temperature.

  Such a difference in specific gravity affects the mobility of the gas entrained in the molten metal. That is, when a temperature difference occurs in each part in the molten metal, a difference occurs in the specific gravity of the molten metal, and the gas moves in a direction of higher temperature (smaller specific gravity) according to the specific gravity difference.

  The above is applied to the embodiment of the present invention. The state of solidification of the molten metal M according to the embodiment of the present invention can be expressed as shown in FIG. 8 as described above. That is, the cross section of the billet in the solidification process is represented as shown in FIG. In FIG. 8, when the temperature distribution in the molten metal M is seen, the temperature in the vicinity of the apex of the parabola of the interface I is low, and the temperature increases toward the inlet 30a1. Correspondingly, the specific gravity of the molten metal M is conversely large near the parabola and decreases toward the inlet 30a1. For this reason, the gas in the molten metal M is changed from the left to the right in FIG. Let this moving speed be v. Thus, when the drawing speed of the product (billet) P is V, if v <V, gas remains in the product (billet) P. Therefore, in this embodiment, v> V is set so that no gas remains in the product (billet) P.

(B) Movement of gas in molten metal M by stirring of molten metal M Rotational stirring of molten metal M according to an embodiment of the present invention is shown in FIG. 9, for example. That is, as the magnetic field generator 2 rotates, the molten metal M in the mold 30 rotates as indicated by an arrow. Due to the centrifugal force accompanying this rotation, the pressure at the outer peripheral portion of the molten metal M becomes higher than that at the central portion. Thereby, the gas in the molten metal M gathers in the center part.

(C) The gas in the molten metal M moves in the direction of the inlet 30a1 by (a) described above, and the gas moves in the center direction of the billet by (b). These combine organically, and degassing from the molten metal M is effectively performed.

  10-15 illustrate different embodiments of the present invention. 10 to 15 correspond to FIG. 5C described above.

  FIG. 10 shows an example in which the rotating magnetic field generator 10 according to the embodiment of the present invention is installed in a line that simultaneously produces two billets P. In the case of this example, the rotating magnetic field generator 10 is disposed between the two billets P and P, and the melts M of the two billets are simultaneously stirred.

  FIG. 11 shows an example of agitation when more billets P are produced simultaneously. Basically, one rotating magnetic field generator 10 is assigned to two billets P. In this case, the rotating magnetic field generator 10 is disposed on the common base 60, and the common base 60 is configured to be movable up and down. Thereby, a maintenance, the replacement | exchange operation | work of the mold 30, etc. can also be performed rapidly. Although various types of vertical moving mechanisms are conceivable, any principle may be used, and therefore a detailed description is omitted here. In addition, a plurality of rotating magnetic field generators 10 on the common base 60 may be connected to each other by a chain or the like so that the plurality of rotating magnetic field generators 10 can be simultaneously driven by a single driving device.

  12 to 13 show an example in which the rotating magnetic field generator 10 is installed in the slab production line. Because the slab is heavy, it becomes a vertical production line. 12 and 13 schematically show the positional relationship between the product (slab) P2 immediately after leaving the mold 30 and the rotating magnetic field generator 10.

  FIG. 12 shows a case where the rotating magnetic field generator 10 is arranged on one side of the four sides around the product (slab) P2. Here, a moving magnetic field acts on the liquid phase portion (molten metal M) in the product (slab) P2, and is rotated and stirred as indicated by an arrow by an eddy current. The rotation direction can be determined by the rotation direction (forward rotation, reverse rotation) of the rotating magnetic field generator 10.

  FIG. 13 shows a case where two rotating magnetic field generators 10 are installed with a product (slab) P2 interposed therebetween (here, vertically). In this case, the stirring force is naturally twice that in the case of FIG.

  14 and 15 show plan views when the rotating magnetic field generator 10 is installed in a large melting furnace (or holding furnace) 41. FIG. The rotating magnetic field generator 10 is brought into close contact with one of the four walls on the outer periphery of the large melting furnace (or holding furnace) 41 to stir the internal molten metal. In addition, you may arrange | position the rotating magnetic field generator 10 below the furnace bottom wall as another one of the four walls.

  From the experiments of the present inventors, it has been found that according to the embodiment of the present invention, when the rotating magnetic field generator 10 is installed for billet production, the productivity (billet drawing speed) can be greatly improved. It was also understood that it was improved by nearly 30% with some variation.

  In addition, the shape of the interface I is also a parabolic shape with a sharp apex in the conventional production method, but according to the embodiment of the present invention, it was also confirmed that it has a trapezoidal distribution. This is thought to lead to tissue uniformity. Therefore, especially in the case of a large number of production lines, not only productivity but also billet production with stable quality becomes possible.

  Furthermore, even in the case of slab production, the effect is considered to be the same as in billet production. However, in general, a slab is a product that is too large to compare with a billet. Therefore, until now, no specific attempt has been made to improve or improve the productivity of slabs. However, the subject has been achieved by employing the rotating magnetic field generator 10 according to the embodiment of the present invention.

  Further, when the rotating magnetic field generator 10 is applied to a large furnace, the temperature difference (between the surface and the furnace bottom) of each part of the molten metal in the large furnace can be 2 ° C. or less, and an extremely high stirring effect can be obtained. It was. In addition, since the temperature of the molten metal became uniform, the heat transfer from the burner heat to the molten metal became smooth, and a significant energy saving effect was obtained. Moreover, the oxide generation amount of the nonferrous metal molten metal was suppressed by this, and the product yield was able to be improved significantly.

Claims (18)

A mold for receiving and cooling a molten metal, comprising an inlet for receiving the molten metal, an internal space for cooling communicating with the inlet, and an outlet communicating with the internal space, A mold that is cooled from the outer peripheral side in the space, solidified from the outside and the molten metal remains inside, and is drawn out from the outlet as a semi-finished product in which the inner liquid phase and the outer solid phase form an interface. When,
A rotating magnetic field generator provided in the vicinity of the outlet, comprising: a magnetic field generator having an arbitrary number of magnetic pole pairs by providing a plurality of magnetic poles so that different polarities are alternately arranged around the outlet; Is provided so as to be rotatable around a first axis along the direction of the lead-out, and passes through the molten metal in the semi-finished product through the output magnetic field lines coming out of the magnetic poles or the input magnetic field lines entering the magnetic poles. A rotating magnetic field generator for rotating the molten metal in the semi-finished product around a second axis lined on the first axis;
A metal product manufacturing apparatus comprising:   The rotating magnetic field generator includes magnetic shielding means for covering a part of the entire circumference around the first axis of the magnetic field generator, and the output magnetic field lines from the magnetic field generator are shielded by the magnetic shielding means. The metal product manufacturing apparatus according to claim 1, wherein the apparatus is a metal product manufacturing apparatus.   The metal product manufacturing apparatus according to claim 1, wherein the magnetic pole pair includes a plurality of magnetic pole pairs.   4. The magnetic shielding device according to claim 1, wherein the magnetic shielding means shields a range of an angle that is half of a total peripheral angle around the first axis of the magnetic field generator. The metal product manufacturing apparatus described in 1.   5. The metal product manufacturing apparatus according to claim 1, wherein the magnetic field generation device is constituted by a permanent magnet or an electromagnet.   6. The metal according to claim 1, further comprising a drive device that rotationally drives the magnetic field generation device, wherein power from the drive device is transmitted by a winding conduction mechanism or a conduction mechanism using a coupling. Product manufacturing equipment.   7. The metal product manufacturing apparatus according to claim 1, wherein the magnetic shielding means is made of a ferromagnetic iron plate.   8. The metal product manufacturing apparatus according to claim 1, wherein billets or slabs are produced as products.   9. The metal product manufacturing apparatus according to claim 1, wherein one rotating magnetic field generator is provided for a plurality of the molds.   10. The metal product manufacturing apparatus according to claim 1, wherein the mold is configured as a product for longitudinal or horizontal product pulling.   The metal product manufacturing apparatus according to claim 1, further comprising a molten metal supply assembly configured to supply a molten metal to the mold. An inlet that receives the molten metal, an internal space for cooling that communicates with the inlet, and an outlet that communicates with the internal space. The molten metal is cooled from the outer peripheral side in the internal space and is solid from the outside. For the stirring provided in the vicinity of the outlet of the mold, the molten metal remains inside, and the mold is drawn out from the outlet as a semi-finished product in which the inner liquid phase and the outer solid phase form an interface. A rotating magnetic field generator,
A magnetic field generator having an arbitrary number of magnetic pole pairs is provided by providing a plurality of magnetic poles so that different poles are alternately arranged around the periphery, and the magnetic field generator rotates around a first axis along the direction of the extraction An output magnetic force line that is provided so as to be driven, or an input magnetic force line that enters the magnetic pole is moved in a state of passing through the molten metal in the semi-finished product, and the molten metal in the semi-finished product is Configured to rotate around a second axis aligned with the first axis;
Furthermore, it comprises a magnetic shielding means that covers a part of the entire circumference around the first axis of the magnetic field generator, and is configured to shield the output magnetic field lines from the magnetic field generator with the magnetic shielding means. The
A rotating magnetic field generator for stirring.   The rotating magnetic field generator for stirring according to claim 12, wherein the magnetic pole pairs are plural.   The said magnetic shielding means shields the range of the half angle of the total perimeter angles around the said 1st axis of the said magnetic field generator, The Claim 12 or 13 characterized by the above-mentioned. A rotating magnetic field generator for stirring.   The rotating magnetic field generator for stirring according to any one of claims 12 to 14, wherein the magnetic field generator is composed of a permanent magnet or an electromagnet.   16. The rotating magnetic field generator for stirring according to claim 12, wherein the magnetic shielding means is formed of a ferromagnetic iron plate. Supplying a molten metal to an inlet communicating with the internal space of the mold having an internal space for cooling;
In the internal space of the mold, the supplied molten metal is cooled from the outer peripheral side, so that the molten metal is solidified from the outside and the molten metal remains inside, and the inner liquid phase and the outer solid phase form an interface. In the product state, pull out from the outlet communicating with the internal space,
A magnetic field generator having a plurality of magnetic poles is rotated around a first axis along the direction of drawing from the mold so that different polarities are alternately arranged around the rotating magnetic field generator provided in the vicinity of the outlet. By moving the output magnetic field lines coming out of the magnetic poles or the input magnetic field lines entering the magnetic poles in a state of passing through the molten metal in the semi-finished product, the molten metal in the semi-finished product is moved to the first Rotate around the second axis lined up with the axis,
A metal product manufacturing method characterized by the above.   As the rotation monitoring device, a device provided with magnetic shielding means on the opposite side of the semi-finished product around the magnetic field generation device is used to shield the output magnetic field lines from the magnetic field generation device with the magnetic shielding device. The metal product manufacturing method according to claim 17, wherein

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