JP6215687B2 - Rotating body for molten metal stirring and molten metal processing apparatus provided with the same - Google Patents

Description

  The present invention relates to a molten metal stirring rotating body used for treating impurities in molten metal and a molten metal processing apparatus including the same.

In recent years, in order to improve fuel economy and reduce CO ₂ emissions, for example, as a measure for reducing the weight of automobile components, molten metal obtained by melting aluminum or its alloy as a raw material is poured into a mold and cooled, A casting method is used.

  Further, there is a treatment method for treating impurities in the molten metal by discharging gas into the molten metal and causing the impurities to float to the liquid surface. In this processing method, a shaft having a through hole for supplying gas in the axial direction, a rotating body attached to an end of the shaft and having a large number of gas ejection holes communicating with the through hole on the peripheral surface; The molten metal processing apparatus which has the rotating body for molten metal stirring provided with this is used.

  As a rotating body for molten metal stirring used in such a processing apparatus, for example, in Patent Document 1, a shaft that is a gas supply path through which gas flows from above to below is fixed to a lower end portion of the shaft. The rotor is integrated with the gas supply pipe, and the rotor has the same diameter from the upper side to the lower side, and is directly connected to the gas passage and the gas passage. There has been proposed a rotating body for molten metal stirring provided with a groove for discharging the gas flowing in the gas passage to the outside after flowing in the outer edge direction.

JP 2006-176874 A

  However, the rotating body for molten metal stirring described in Patent Document 1 has a configuration in which a gas passage having the same diameter from the upper side to the lower direction is directly connected to the groove. The thermal stress generated when the steel is immersed in the molten metal tends to concentrate on the boundary between the gas passage and the groove, and the rotor is subjected to a large thermal stress. When the molten metal stirring body is repeatedly immersed in the molten metal There was a problem that the rotor was easily cracked.

  The present invention has been devised to solve the above problem, and a molten metal stirring rotator that is less likely to cause cracks in the rotor even when the molten metal stirring rotator is repeatedly immersed in the molten metal. It aims at providing the molten metal processing apparatus provided with.

A rotating body for stirring molten metal according to the present invention includes a cylindrical shaft having a first gas supply path through which gas flows from above to below, and a rotor having a connecting portion connected to the lower end of the shaft. And the rotor is provided inside the connecting portion, and the second gas supply path for discharging the gas flowing through the first gas supply path to the lower surface side of the rotor; A discharge path for discharging the gas flowing through the second gas supply path in the direction of the outer edge and then discharging the gas to the outside; located below the connection portion and above the discharge path; will have a space connected with the discharge passage, the diameter of the space, the second rather larger than the diameter of the gas supply channel, the rotor, which has the connection portion, to said outer edge direction from said space A plate-like body having a first cutout extending; A plurality of first partition walls extending from the space side toward the outer edge direction on the lower surface side of the plate-like body and along the first cutout portion, the first partition wall and the plate A space surrounded by the state body is used as the discharge passage, and a space surrounded by the first notch and the first partition is a gap .
In addition, the rotor includes a cylindrical shaft that is a first gas supply path through which gas flows from the upper side to the lower side, and a rotor having a connection portion connected to the lower end of the shaft. A second gas supply path provided inside the connection portion for discharging the gas flowing through the first gas supply path to the lower surface side of the rotor, and a flow through the second gas supply path A discharge path for discharging the discharged gas to the outside after flowing in the outer edge direction, and a space below the connection portion and above the discharge path and connected to the discharge path. The diameter of the space is larger than the diameter of the second gas supply path, and the rotor is provided at the outer edge provided on the plate-like body having the connection portion and the lower surface side of the plate-like body. A plurality of first bulkheads extending toward and spaced along the outer edge A plurality of second partitions arranged at intervals, wherein the first partition and the second partition are disposed in a non-contact manner; the first partition and the second partition A space surrounded by the partition wall and the plate-like body is the discharge path.

  Moreover, the molten metal processing apparatus of the present invention is characterized by comprising a container for containing molten metal, and the molten metal stirring rotator connected to the rotation drive mechanism via a connector. .

  According to the molten metal stirring rotor of the present invention, the location where the thermal stress tends to concentrate in the rotor is dispersed at the boundary between the space and the second gas supply path and the boundary between the space and the discharge path. The thermal stress applied to the whole can be suppressed, and even if the rotating body for molten metal stirring is repeatedly immersed in the molten metal, the rotor is less likely to crack.

  Moreover, according to the molten metal processing apparatus of this invention, since maintenance cost can be reduced, it can be set as a favorable molten metal processing apparatus over a long period of time.

It is a longitudinal cross-sectional view which shows an example of the molten metal processing apparatus provided with the rotary body for molten metal stirring of this embodiment. An example of the rotor which comprises the rotary body for molten metal stirring of this embodiment is shown, (a) is the perspective view seen from the lower surface side of the rotor, (b) is the top view seen from the lower surface side of the rotor, (c) FIG. 6 is a cross-sectional view taken along line AOB in (b). The other example of the rotor which comprises the rotating body for molten metal stirring of this embodiment is shown, (a) is the perspective view seen from the lower surface side of the rotor, (b) is the top view seen from the lower surface side of the rotor, c) is a sectional view taken along line AOB in (B). It is the perspective view seen from the lower surface side of the rotor which shows another example of the rotor which comprises the rotary body for molten metal stirring of this embodiment. The other example of the rotor which comprises the rotating body for molten metal stirring of this embodiment is shown, (a) is the perspective view seen from the lower surface side of the rotor, (b) is the top view seen from the lower surface side of the rotor, c) is a sectional view taken along line AOB in (B). It is the top view seen from the lower surface side of the rotor which shows another example of the rotor which comprises the rotary body for molten metal stirring of this embodiment. It is the top view seen from the lower surface side of the rotor which shows another example of the rotor which comprises the rotary body for molten metal stirring of this embodiment.

  Hereinafter, an example of the molten metal stirring rotator of the present embodiment and a molten metal processing apparatus including the same will be described.

  FIG. 1 is a longitudinal sectional view showing an example of a molten metal processing apparatus including a rotating body for molten metal stirring according to the present embodiment.

  As in the example shown in FIG. 1, the molten metal processing device 25 includes a cylindrical shaft having a container 12 for containing a molten metal 11 and a first gas supply path 2 through which gas flows from the upper side to the lower side. 3 and a rotor 5 having a rotor 5 having a connecting portion 4 connected to the lower end of the shaft 3, and simultaneously rotating the shaft 3 and the rotor 5 while supplying gas to the first gas supply path 2. And the shaft 3 is connected to the rotation drive mechanism 6 by a connector 7.

The rotor 5 includes a second gas supply path 8 provided inside the connecting portion 4 for discharging the gas flowing through the first gas supply path 2 to the lower surface side of the rotor 5, and a second gas supply path 8. A discharge passage (not shown) for discharging the gas flowing through the gas supply passage 8 to the outside after flowing in the outer edge direction is provided.

  The molten metal processing device 25 provided with the molten metal stirring rotator 1 rotates the shaft 3 and the rotor 5 immersed in the molten metal 11 by the rotation drive mechanism 6 connected via the connector 7. At that time, the gas supplied from the rotation drive mechanism 6 is discharged to the lower surface side of the rotor 5 through the first gas supply path 2 and the second gas supply path 8, and the discharged gas becomes bubbles. The bubbles are discharged to the outside of the rotor 5 (the outer periphery of the rotor 5) through the discharge path.

  Thus, impurities 30 such as hydrogen and non-metal oxide in the molten metal 11 are taken in or attached to the fine bubbles discharged to the outside of the rotor 5. Then, the bubbles in which the impurities 30 have been taken in or attached float on the liquid surface of the molten metal 11, so that the impurities 30 are collected on the liquid surface side. Although not shown in FIG. 1, in the container 12, by providing a discharge part near the liquid surface (located below the liquid surface), the impurities 30 collected on the liquid surface side can be easily collected. The molten metal 11 can be efficiently purified.

  FIG. 2 shows an example of a rotor constituting the molten metal stirring rotor of this embodiment, (a) is a perspective view seen from the lower surface side of the rotor, and (b) is a plan view seen from the lower surface side of the rotor. (C) is sectional drawing in the AOB line in (b).

  The rotor 5 shown in FIG. 2 has a plurality of partition walls 13 (corresponding to a second partition wall in the following description) arranged at intervals along the outer edge on the lower surface side, and the lower surface of the rotor 5 And a space surrounded by the adjacent partition walls 13 is a discharge path 9. Instead of the partition wall 13, a plurality of partition walls (corresponding to the first partition wall in the following description) extending toward the outer edge are provided on the lower surface of the rotor 5, and the space between adjacent partition walls may be used as the discharge path 9. Alternatively, a groove extending toward the outer edge may be provided on the lower surface of the rotor 5, and the groove may be used as the discharge path 9.

  As shown in FIG. 2C, the rotor 5 is provided with a space 10 by providing a step between the peripheral surface of the second gas supply path 8 and the lower surface of the rotor 5 corresponding to the discharge path 9. ing. That is, the rotor 5 has a space 10 below the connecting portion 4 to the shaft 3 and above the discharge path 9 and connected to the discharge path 9. 2 is larger than the diameter of the gas supply path 8.

  With such a configuration, the location where the thermal stress is likely to concentrate is dispersed at the boundary 14 between the space 10 and the second gas supply path 8 and the boundary 15 between the space 10 and the discharge path 9. Thus, even if the molten metal stirring rotor 1 is repeatedly immersed in the molten metal 11, the rotor 5 is unlikely to crack.

  Further, by making the diameter of the space 10 larger than the diameter of the second gas supply path 8, the space 10 becomes a bubble pool, and the rotation of the rotor 5 causes the bubbles to uniformly spread in the direction of the outer edge of the rotor 5. As a result, bubbles dispersed well outside the rotor 5 can be discharged.

The diameter of the space 10 is preferably in the range of 1.2 to 2 times the diameter of the second gas supply path 8.

  Here, by making the side surface in the space 10 a surface inclined in the outer edge direction from the end of the second gas supply path 8 toward the discharge path 9, it is preferable that bubbles easily flow in the outer edge direction of the rotor 5. It is.

FIG. 3 shows another example of a rotor constituting the rotating body for stirring molten metal of the present embodiment, (a) is a perspective view seen from the lower surface side of the rotor, and (b) is seen from the lower surface side of the rotor. Plan view,(
c) is a sectional view taken along line AOB in (B).

  The rotor 5 shown in FIG. 3 includes a plate-like body 22 having a first cutout portion 18 extending in the outer edge direction from the space 10 side, and a lower surface side of the plate-like body 22 and the first cutout portion 18. A plurality of first partition walls 16 extending from the space 10 side toward the outer edge direction are provided. Then, a space surrounded by the plate-like body 22 between the adjacent first partition walls 16 is defined as the discharge path 9, and a space surrounded by the first notch portion 18 and the adjacent first partition wall 16. Is the gap 21.

  With such a configuration, the gas discharged to the lower surface side of the rotor 5 through the second gas supply path 8 becomes bubbles, and the bubbles are discharged to the discharge path 9 and the gap 21. Then, most of the bubbles discharged to the discharge path 9 are discharged to the outside of the rotor 5 (the outer periphery of the rotor 5) through the discharge path 9 by centrifugal force as the rotor 5 rotates. Further, most of the bubbles discharged into the gap 21 are dispersed in the molten metal 11 within the range of the outer diameter of the rotor 5. Thereby, bubbles can be dispersed in a wide range in the molten metal 11, and the molten metal 11 can be purified efficiently. As shown in FIG. 3B, when the width of the discharge passage 9 is B1 and the width of the gap 21 is B2, the value of B1 / B2 is preferably in the range of 0.8 to 1.2. By being inside, the foam can be uniformly dispersed in the molten metal 11, and the molten metal 11 can be purified efficiently.

  FIG. 4 is a perspective view showing another example of the rotor constituting the molten metal stirring rotor of the present embodiment as viewed from the lower surface side of the rotor.

  Here, due to the difference between the temperature of the gas supplied from the gas supply path 2 and the temperature of the molten metal 11, thermal stress is likely to occur on the space 10 side of the first partition 16, and the first partition 16 Cracks and breakage due to thermal stress are likely to occur on the space 10 side.

  The rotor 5 shown in FIG. 4 is formed on the space 10 side of the first partition wall 16 so that the height of the first partition wall 16 gradually decreases toward the space 10 side.

  With such a configuration, although the stirring ability of the molten metal 11 is slightly reduced, a thermal stress is generated on the space 10 side of the first partition wall 16 where a thermal stress is likely to occur due to a temperature difference between the gas and the molten metal 11. A relief 19 can be provided to prevent this. This makes it difficult for cracks and breakage due to thermal stress to occur on the space 10 side of the first partition 16. Here, the space 10 side means within a range of 5 to 30% with respect to the entire length of the first partition 16. In addition, the shape of the relief 19 referred to here may be a taper or the like if the height of the first partition 16 gradually decreases toward the space 10 side on the space 10 side of the first partition 16. A curved surface or the like can be used, and in particular, a curved surface shape in which the volume of the first partition wall 16 on the space 10 side is reduced is preferable.

  FIG. 5 shows another example of the rotor constituting the rotating body for stirring molten metal of the present embodiment, (a) is a perspective view seen from the lower surface side of the rotor, and (b) is seen from the lower surface side of the rotor. A plan view, (c) is a cross-sectional view taken along the line AOB in (B).

  The rotor 5 shown in FIG. 5 is formed with a plurality of first partition walls 16 that extend radially from the space 10 side toward the outer edge, and second partition walls 17 that are arranged at intervals along the outer edge of the rotor 5. ing. The adjacent first partition wall 16 and second partition wall 17 are spaced apart (arranged so as to be non-contact), and the first partition wall 16 and the second partition wall 17 are A space surrounded by the plate-like body 22 becomes the discharge path 9. FIG. 5 shows an example in which the second partition walls 17 are arranged so as not to intersect with the axes of the plurality of first partition walls 16 extending radially. Further, in the plan view of the rotor 5 from the lower surface side, the first partition 16 is shown spaced from the edge of the space 10.

  With such a configuration, the space between the second partition walls 17 becomes a discharge port on the outer edge side. Then, by narrowing the space between the first partition wall 16 and the second partition wall 17, the bubbles flow faster in the outer edge direction. Thereby, bubbles can be dispersed more vigorously from the discharge port to the outside of the rotor 5, and the molten metal 11 can be purified more efficiently.

  Further, only one side of the adjacent first partition walls 16 may be arranged to be spaced from the second partition wall 17, and in this case, only the first partition wall 16 on the side opposite to the rotation direction of the rotor 5 is provided. Is preferably arranged with a space between the second partition wall 17 and the second partition wall 17.

  With such a configuration, the first partition 16 and the second partition 17 on the rotation direction side of the rotor 5 are connected, so the first partition 16, the second partition 17, and the plate-like body. It becomes easy to hold bubbles in the space surrounded by 22 (discharge passage 9), and the gas can be more efficiently dispersed outside the rotor 5.

  Further, when the rotor 5 is viewed from the lower surface side, the first partition wall 16 is located at a distance from the edge of the space 10, so that the thickness around the space 10 is locally increased by the first partition wall 16. Can be suppressed. Thereby, the stress concentration in the rotor 5 can be more relaxed.

  In the rotor 5 constituting the molten metal stirring rotor 1 of this embodiment, it is preferable that the height of the first partition 16 is equal to or less than the height of the second partition 17.

  With such a configuration, even if the foam flowing along the first partition wall 16 flows to the outer edge side beyond the first partition wall 16, the foam is broken when the foam exceeds the first partition wall 16. As a result, finer bubbles can be more efficiently dispersed outside the rotor 5.

  FIG. 6 is a plan view seen from the lower surface side of the rotor, showing another example of the rotor constituting the rotating body for stirring molten metal of the present embodiment.

  In the rotor 5 shown in FIG. 6, at least a part of the outer edge between the second partition walls 17 is a second notch 20.

  With such a configuration, when the foam is discharged through the second notch 20, it is torn by the second partition wall 17 and then to the second notch 20. It becomes finer foam. Thereby, fine bubbles can be dispersed outside the rotor 5 and the surface area of the bubbles to which the impurities 30 are attached can be increased, so that the molten metal 11 can be purified efficiently.

  Further, the rotor 5 constituting the molten metal stirring rotator 1 of the present embodiment can be disposed in contact with the outer edge of the first partition 16 when viewed from the lower surface side. That is, for example, in the rotor 5 shown in FIG. 6, one end of the first partition wall 16 and the second notch portion 20 can be disposed in contact with each other.

  With such a configuration, the discharge port between the first partition wall 16 and the second partition wall 17 can be made small, and bubbles can be formed in the first partition wall 16, the second partition wall 17, and the second partition wall. Since it is cut by the notch 20 and becomes finer, finer bubbles can be dispersed outside the rotor 5 and the molten metal 11 can be purified efficiently.

  FIG. 7 is a plan view seen from the lower surface side of the rotor, showing another example of the rotor constituting the rotating body for stirring molten metal of the present embodiment.

  In the rotor 5 shown in FIG. 7, the second cutout portion 20 is provided from the outer peripheral side to a length that is approximately half the radius of the rotor 5, and the first partition 16 further includes the cutout second cutout. It is provided along the part 20. In FIG. 7, the first partition 16 is U-shaped in plan view.

  Thereby, the gas discharged to the lower surface side of the rotor 5 through the second gas supply path 8 becomes bubbles, and the bubbles flow to the outer peripheral side along the outer surface of the U-shaped first partition wall 16. Since the gas is discharged from the discharge port formed by the first partition wall 16, the second partition wall 17, and the second notch portion 20, the bubbles can be efficiently dispersed outside the rotor 5.

  Furthermore, since the thermal stress concentrated around the second notch portion 20 can be relaxed, even if the molten metal stirring rotor 1 is repeatedly immersed in the molten metal 11, the rotor 5 is hardly cracked.

  Further, as described above, the U-shaped first partition wall 16 may be, for example, a J-shape in which only the opposite side to the rotational direction of the rotor 5 is spaced from the second partition wall 17. it can.

  Up to this point, it has been described that bubbles are discharged from the discharge port, but the bubbles should be discharged into the molten metal 11 beyond the partition wall 13, the first partition wall 16 and the second partition wall 17. Therefore, the tip shapes in the height direction of the partition wall 13, the first partition wall 16, and the second partition wall 17 can be made narrower in the direction toward the tip. Thereby, the bubbles can be made finer, the fine bubbles can be dispersed, and the surface area of the bubbles can be increased, so that the molten metal 11 can be purified efficiently.

  Moreover, the rotor 5 which comprises the molten metal stirring rotary body 1 of this embodiment can also be formed so that the discharge path 9 may incline downward toward the outer edge direction.

  With such a configuration, the rotation of the rotor 5 causes centrifugal bubbles to cause bubbles to flow from the discharge path 9 toward the outer edge, and to discharge the bubbles discharged from the outer edge toward the lower side of the container 12. it can. Thereby, the bubbles can be dispersed in a wide range in the molten metal 11, and the molten metal 11 can be purified efficiently.

  And as a material of the shaft 3 and the rotor 5 constituting the molten metal stirring rotor 1 of the present embodiment, various ceramics such as alumina, zirconia, silicon nitride, silicon carbide or cordierite can be applied. It is preferable to be made of a silicon nitride-based sintered body in that it has excellent impact properties and low wettability with the molten metal 11. Thereby, when the rotating body 1 for molten metal stirring of this embodiment is pulled up from the molten metal 11 at the time of maintenance or after completion of processing, the adhesion of the molten metal 11 to the shaft 3 and the rotor 5 can be extremely reduced. . Further, since the shaft 3 and the rotor 5 are made of the same material, the connection portion 4 between the shaft 3 and the rotor 5 is less likely to be loosened or cracked due to a difference in thermal expansion between them. can do.

  Further, the molten metal processing apparatus 25 including the molten metal stirring rotating body 1 of the present embodiment described above can reduce the number of times of member replacement, more specifically, the replacement of the rotor 5, so that the maintenance cost can be reduced. Therefore, it is possible to obtain a good molten metal processing apparatus 25 over a long period of time.

  Next, an example of the manufacturing method of the molten metal stirring rotor 1 of the present embodiment will be described.

First, the rotor 5 made of a silicon nitride sintered body is produced. A silicon nitride primary material having an average particle size of 0.5 to 10 μm, a predetermined amount of a sintering aid, a binder and a solvent are mixed to form a slurry, which is then spray granulated with a spray dryer to obtain a silicon nitride secondary material. obtain. And the disk-shaped molded object used as the rotor 5 is obtained by an isostatic press molding method (rubber press) using this silicon nitride secondary raw material. Thereafter, each part to be the partition wall 13, the first and second partition walls 16 and 17, the first and second notch portions 18 and 20 and the like is subjected to cutting work on the molded body, and then, in a reducing atmosphere furnace. Firing is performed at a maximum temperature of 1800 to 2100 ° C., and grinding is performed as necessary to obtain a rotor 5 made of a silicon nitride sintered body. A male screw for attaching to the shaft 3 is provided on the outer peripheral surface of the connecting portion 4 of the rotor 5.

  Next, the shaft 3 made of a silicon nitride-based sintered body is produced.

  First, a silicon nitride secondary raw material is obtained by the same method as that for manufacturing the rotor 5, and then a cylindrical molded body to be the shaft 3 is formed by a hydrostatic press molding method (rubber press) using the secondary raw material. After forming and cutting the formed body, it is fired at a temperature of 1800 to 2100 ° C. in a reducing atmosphere furnace, and subjected to grinding as necessary to obtain a shaft 3 made of a silicon nitride sintered body. . Note that a female thread is provided on the inner peripheral surface of the lower end of the shaft 3 by performing cutting or grinding.

  And the rotary body 1 for molten metal stirring of this embodiment can be obtained by fastening the internal thread of the shaft 3 and the external thread of the rotor 5.

1: Molten metal stirring rotor 2: First gas supply path 3: Shaft 4: Connection part 5: Rotor 6: Rotation drive mechanism 7: Connecting tool 8: Second gas supply path 9: Discharge path
10: Space
11: Molten metal
12: Container
13: Bulkhead
14: Boundary between space and second gas supply path
15: Boundary between space and discharge channel
16: First partition
17: Second partition
18: First notch
19: Escape
20: Second notch
21: Gap
22: Plate
25: Molten metal processing equipment
30: Impurities

Claims (10)

A cylindrical shaft whose inside is a first gas supply path through which gas flows downward from above, and a rotor having a connection portion connected to the lower end of the shaft, the rotor including the connection A second gas supply path for discharging the gas flowing through the first gas supply path to the lower surface side of the rotor, and a gas flowing through the second gas supply path. A discharge path for discharging to the outside after flowing in the outer edge direction, and a space below the connection portion and above the discharge path and connected to the discharge path. becomes, the diameter of the space, the second rather larger than the diameter of the gas supply channel, the rotor, together with having the connecting portion, a plate shape having a first notch portion extending from said space to said outer edge direction A body, a lower surface side of the plate-like body, and the first A plurality of first partition walls extending from the space side toward the outer edge direction along the notch are provided, and a space surrounded by the first partition wall and the plate-like body is the discharge path. is, molten metal 攪拌用rotating body characterized in that said first notch portion and the space surrounded by the first partition wall is a gap portion. A cylindrical shaft whose inside is a first gas supply path through which gas flows downward from above, and a rotor having a connection portion connected to the lower end of the shaft, the rotor including the connection A second gas supply path for discharging the gas flowing through the first gas supply path to the lower surface side of the rotor, and a gas flowing through the second gas supply path. A discharge path for discharging to the outside after flowing in the outer edge direction, and a space below the connection portion and above the discharge path and connected to the discharge path. The diameter of the space is larger than the diameter of the second gas supply path, and the rotor is directed to a plate-like body having the connection portion and an outer edge provided on the lower surface side of the plate-like body. A plurality of extending first bulkheads and spaced along the outer edge A plurality of second partition walls disposed, wherein the first partition wall and the second partition wall are disposed in a non-contact manner, and the first partition wall, the second partition wall, A space surrounded by the plate-like body serves as the discharge path, and a rotating body for molten metal stirring. In the space side of the first partition wall, molten metal agitating rotating body according to claim 1, the height of the first partition wall, characterized in that it gradually becomes lower toward the space. 3. The molten metal stirring rotor according to claim 2 , wherein when the rotor is viewed in plan from the lower surface side, the first partition wall is located at a distance from an edge of the space. The molten metal stirring rotor according to claim 2 or 4 , wherein a height of the first partition is equal to or less than a height of the second partition. Claim 2, molten metal agitating rotating body according to claim 4 or claim 5, wherein the first partition wall is disposed in contact with the outer edge. The molten metal stirring rotator according to any one of claims 4 to 6 , wherein at least a part of the outer edge between the second partition walls is a second notch. Said second septum wall, molten metal agitating rotating body according to claim 7, characterized in that provided along said second notch. The molten metal stirring rotator according to any one of claims 1 to 8 , wherein the discharge path is inclined downward toward the outer edge. A molten metal comprising: a container for containing molten metal; and a rotating body for molten metal stirring according to any one of claims 1 to 9 , which is connected to a rotation drive mechanism through a coupling tool. Processing equipment.

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