JP2009268322A - Apparatus and method for manufacturing squirrel cage rotor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for manufacturing a squirrel cage rotor that manufactures a high-quality squirrel cage rotor by preventing the entry of a molten conductive material between laminated circular magnetic steel sheets which constitute a rotor core. <P>SOLUTION: The manufacturing apparatus 100 for a squirrel cage rotor includes a fixed upper mold 9 having an annular protrusion 9a and a movable mold 10 attached to the fixed mold 9 via a deformable member 18. The movable mold 10 holds the outer periphery of an end face of the rotor core 5 so that the movable mold 10 and the rotor core 5 can integrally be moved in a laminating direction of the rotor core 5 when a molten conductive material is pressurized. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an apparatus and a method for manufacturing a cage rotor including a rotor core formed by laminating a plurality of circular magnetic steel plates, and a cage conductor having a plurality of slot bars and a pair of end rings. Is.

  2. Description of the Related Art Conventionally, a cage rotor manufacturing apparatus includes a fixed mold having a pair of end ring forming portions, a rotor core movably held in the fixed mold, and a slot penetrating the rotor core. A gate for forming a gate for introducing the molten conductor material into the hole and the end ring forming portion, and a plunger for filling and pressurizing the molten conductor material into the stationary mold through the gate. By pressing the end ring formed on both end faces of the rotor core by moving the rotor core and the sprue mold in the pressurizing direction of the plunger, the occurrence of shrinkage defects inside the end ring is suppressed. (For example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 2001-9560 (FIG. 5)

  In the cage rotor manufacturing apparatus as described above, the molten conductor material does not enter between the rotor core and the fixed mold so that the rotor core can move smoothly in the injection direction in the fixed mold. A gap of a degree is provided. However, at the time of filling the molten conductor material, the circular magnetic steel sheet constituting the rotor core is thermally expanded in the radial direction by contact with a high-temperature molten conductor material (for example, about 650 to 800 ° C. in the case of an aluminum alloy), There is a possibility of contact with the inner surface of the fixed mold. For this reason, when the rotor core moves in the stationary mold during the subsequent pressurization, the circular magnetic steel sheet and the inner surface of the stationary mold come into sliding contact with each other to create a gap between the circular magnetic steel sheets, and the gap is melted. There is a problem that the conductor material penetrates. In recent years, in particular, thin magnetic steel sheets have been made thinner for the purpose of reducing the core loss of the rotor core. Therefore, the circular magnetic steel sheets are easily bent when they are in sliding contact with the inner surface of the fixed mold, and a gap is generated between them. This increases the risk of intrusion of the molten conductor material.

  The present invention has been made to solve the above-described problems, and provides a cage rotor manufacturing apparatus and a manufacturing method thereof that can prevent the molten conductor material from entering between the circular magnetic steel plates constituting the rotor core. It is to provide.

  The cage-shaped rotor manufacturing apparatus according to the present invention includes a movable mold that sandwiches the outer peripheral portion of the end face of the rotor core and is movable in the stacking direction of the rotor core, and one end face of the rotor core. And in cooperation with the movable mold, a fixed lower mold forming a first end ring forming portion and a hot water reservoir communicating with the first end ring forming portion, in cooperation with the other end surface of the rotor core and the movable die. From the fixed upper mold that forms the second end ring forming portion and the hot water pool portion, the first end ring forming portion, the slot hole, and the second end ring forming portion are filled with molten conductor material and added. And pressurizing means for pressing.

  The method of manufacturing a cage rotor according to the present invention includes a step of laminating circular magnetic steel plates to form a rotor core in a cylindrical shape, and a step of sandwiching an outer peripheral portion of the end surface of the rotor core with a movable mold. A first end ring forming portion that communicates with the hot water pool portion in cooperation with the end face of the rotor core, the movable die, and the fixed die, and the first end through the slot hole. Forming a second end ring forming portion communicated with the ring forming portion; and melting from the hot water pool portion into the first end ring forming portion, the slot hole, and the second end ring forming portion. A step of filling a conductor material; and a step of forming a cage conductor by moving the movable mold together with the rotor core in a laminating direction while pressurizing the molten conductor material. It is.

  According to the present invention, the molten conductor between the circular magnetic steel plates constituting the rotor core is provided by sandwiching the outer peripheral portion of the end surface of the rotor core and providing the movable mold movable in the stacking direction of the rotor core. Intrusion of material can be prevented, and a high-quality cage rotor can be manufactured.

Embodiment 1 FIG.
1 is a cross-sectional view showing a cage rotor manufacturing apparatus according to Embodiment 1 of the present invention, and FIG. 2 is a cage rotation manufactured by a cage rotor manufacturing apparatus according to Embodiment 1 of the present invention. It is sectional drawing which shows a child.
In FIG. 1, a squirrel-cage rotor manufacturing apparatus 100 is attached to a movable plate of a molding machine (not shown), and has a fixed upper die 9 having an annular projection 9a, and a movable metal attached to the fixed upper die 9. It comprises a mold 10 and a fixed lower mold 11 attached to a fixed plate of a molding machine (not shown).
The movable mold 10 is composed of two parts, an iron core holder 101 and an iron core outer periphery holding die 102, and is formed so as to sandwich the outer peripheral portion of the end surface of the rotor iron core 5 and to cover the side surface of the rotor iron core 5. ing. An air discharge port 16 is provided on the end surface of the iron core holder 101.

The inner peripheral portion of the end surface of the rotor core 5 is clamped by a pair of core inner peripheral clamping molds 13 composed of a first core inner peripheral clamping mold 131 and a second core inner peripheral clamping mold 132, and this iron core. The inner periphery clamping mold 13 is fastened to the suspension shaft 12 inserted into the inner hole 2 of the rotor core 5 through bolts 131a and nuts 24 provided in the first core inner periphery mold.
An annular projection 9a of the fixed upper die 9 is slidably inserted into an annular gap 15 formed between the second inner core holding die 132 and the outer core holding die 102. ing. Further, the first and second core inner peripheral clamping molds 131 and 132 are each provided with a taper that reduces the diameter on the rotor core 5 side.

The suspension shaft 12 has a notch 12a, and is suspended from the fixed upper die 9 so as to be movable in the vertical direction via a suspension plate 17 inserted into the notch 12a. A deformable member 18 is installed between the fixed upper mold 9 and the second iron core inner periphery clamping mold 132, and a predetermined interval is provided between the fixed upper mold 9 and the movable mold 10. The deformable member 18 may be provided between the fixed upper mold 9 and the movable mold 10. The deformable member 18 has such a characteristic that the rotor core 5 and the movable mold 10 are held so as not to move when the molten conductor material is filled, and is deformed by the pressure of the plunger after the filling is completed. Or an elastic-plastic material such as an aluminum alloy ring member.
Further, the lower mold 11 is provided with a hot water reservoir 19 having a circular cross section, and a plunger 20 is slidably disposed on the hot water reservoir 19.

  In the squirrel-cage rotor manufacturing apparatus 100 configured as described above, the gate 21 and the space between the lower end surface of the rotor core 5, the iron core holder 101, and the first iron core inner periphery clamping mold 131, An annular pouring gate side end ring forming portion 22 is formed. Further, in the space surrounded by the upper end surface of the rotor core 5, the second core inner periphery clamping mold 132, the core outer periphery pressing mold 102, and the fixed upper mold protrusion 9 a, the gate side An annular anti-water gate side end ring forming portion 23 communicating with the end ring forming portion 22 is formed. By filling the gate side end ring forming portion 22, the slot hole 3 and the counter gate side end ring forming portion 23 with a molten conductor material, a pair of end rings 8a and 8b of the cage rotor 1 shown in FIG. A cage conductor 6 comprising the slot bar 7 is formed.

  The first and second iron core inner periphery clamping molds 131 and 132 are provided with a taper that reduces the diameter on the rotor core 5 side, so that the gate side end ring forming portion 22 and the counter gate side end are provided. The ring forming portion 23 is formed in a shape having a taper on the inner peripheral side. Further, the parts constituting the mold are manufactured using heat resistant steel such as JIS SKD61 of hot tool steel.

Next, a method for manufacturing a cage rotor will be described.
First, the central hole 2 and a circular magnetic steel plate 4 in which a plurality of slot holes 3 concentrically arranged with respect to the central hole 2 are punched are suspended in the central hole 2 of the rotor core 5 formed by laminating a predetermined number of layers. The lower shaft 12 is inserted. Then, the inner periphery of the rotor core is sandwiched between the pair of core inner periphery sandwiching molds 13, and the first and second core inner periphery sandwiching molds are provided by screws 131 a and nuts 24 provided in the first core inner periphery sandwiching mold 131. 131 and 132 are fastened to the suspension shaft 12 respectively. In this way, by sandwiching the inner peripheral portion of the end surface of the rotor core 5 by the pair of inner peripheral sandwiching molds 13, the stacked circular magnetic steel plates 4 are brought into pressure contact with each other.
Then, the rotor core 5 inserted with the suspension shaft 12 and clamped by the core inner periphery clamping mold 13 is inserted into an inner hole 101 a provided in the center of the core holder 101, and the core outer periphery holding mold 102 is connected to the core holder 101. By fastening, the movable mold 10 in which the outer peripheral portion of the end surface of the rotor core 5 is sandwiched is assembled.

  Next, the deformable member 18 is arranged on the second iron core inner periphery clamping die 132 attached to the movable die 10 assembled in this way, and the fixed upper die 9 attached to the movable plate of the molding machine (not shown). The annular protrusion 9 a is inserted into the annular gap 15 between the second iron core inner periphery clamping mold 132 and the movable mold 10. Then, the movable mold 10 is suspended from the fixed upper mold 9 by inserting the suspension plate 17 into the notch 12 a of the suspension shaft 12. At this time, the presence of the deformable member 18 provides a predetermined gap between the fixed upper mold 9 and the movable mold 10.

Next, for example, after pouring a molten conductor material such as a molten aluminum alloy melted at 650 ° C. or higher into the hot water reservoir 19 preheated to about 100 ° C. to 200 ° C., a movable plate of a molding machine (not shown) is operated, The movable mold 10 is fitted into the inner hole 11 a of the fixed lower mold 11. Then, by operating the plunger 20 upward, the molten conductor material is filled into the gate side end ring forming portion 22, the slot hole 3, and the anti-gate side end ring forming portion 23 from the hot water pool portion 19 through the gate 21. . At this time, the deformable member 18 holds the movable mold 10 so as not to move without being deformed by the inflow resistance during filling.
Further, since the air filling the gate end ring forming portion 22, the slot hole 3 and the anti-gate end ring forming portion 23 is pushed out of the apparatus through the air discharge port 16 by the molten conductor material. It is possible to suppress the air entrained in the molten conductor material from remaining in the cage conductor 6 as a bubble defect.

  Then, after the molten conductor material fills all of the gate side end ring forming portion 22, the slot hole 3, and the anti-gate side end ring forming portion 23, the pressure of the plunger 20 is increased to 40 MPa or more to add the molten conductor material. Press. At this time, since solidification is started from within the slot having the smallest heat capacity, the pressure transmission path is blocked by the solidified slot, and the pressure of the plunger 20 is not transmitted to the molten conductor material filled in the anti-gate end ring 23. However, the pressure of the plunger 20 acts so as to contract the deformable member 18 via the first iron core inner periphery clamping mold 131, the rotor core 5 and the second iron core inner periphery sandwiching mold 132, so that the deformable member 18 contracts. Accordingly, the movable mold 10 moves in the stacking direction together with the rotor core 5, and the pressure by the plunger 20 acts on the molten conductor material filled in the anti-gate side end ring forming portion 23.

  At this time, the rotor core 5 moves in the stacking direction integrally with the movable mold 10 while the outer peripheral portion of the rotor core 5 is sandwiched between the movable molds 10, and therefore, between the circular magnetic steel plates 4 constituting the rotor core 5. There is no gap, and intrusion of the molten conductor material can be prevented. Further, since the deformable member 18 does not allow the fixed mold 10 to move when the molten conductor material is filled, and allows the fixed mold 10 to move when the molten conductor material is pressurized, the volume of the molten conductor material is reduced. During the transformation from the liquid phase to the solid phase, the anti-gate side end ring forming portion 23 can be pressurized, and the occurrence of shrinkage defects in the anti-pouring side end ring forming portion 23 can be suppressed.

  On the other hand, the molten conductor material filled in the gate-side end ring forming portion 22 has a directional solidification mode from the rotor core 5 toward the pool 19 due to the large heat capacity of the pool 19. Therefore, similarly to the anti-pouring side end ring forming portion 23, the pouring gate side end ring forming portion 22 can be pressurized by applying a pressure by the plunger 20 until the molten conductor material is completely solidified. The generation of shrinkage defect in the portion 22 can be suppressed.

  According to the present embodiment, by sandwiching the outer peripheral portion of the end surface of the rotor core 5 and providing the movable mold 10 movable in the stacking direction of the rotor core 5, the movable core material can be moved when pressurized. Since the mold 10 moves integrally with the rotor core 5, there is no gap between the circular magnetic steel plates 4 constituting the rotor core 5, and the molten conductor material is connected between the circular magnetic steel plates 4. Intrusion can be prevented. In addition, since a pair of end rings formed opposite to both end faces of the rotor core 5 can be pressurized with one plunger until solidification is completed, the occurrence of shrinkage defects in the end ring can be suppressed with a simple molding machine. . Therefore, a cage rotor with high quality and high reliability can be obtained.

  In the present embodiment, the molten conductor material is filled into the gate side end ring forming portion 22, the slot hole 3, and the counter gate side end ring forming portion 23 by operating the plunger 20 disposed in the lower mold 11. However, by fixing the plunger 20 and lowering the movable plate of a molding machine (not shown) to which the fixed upper mold 9 and the movable mold 10 are attached, the molten conductor material is poured into the gate side end ring forming portion 22 and the slot hole 3. And you may fill in the anti-pouring side end ring formation part 23. FIG. By doing in this way, since the drive source for driving the plunger 20 becomes unnecessary, a simpler molding machine can be used.

  Further, in the present embodiment, the air discharge port 16 is provided in the movable mold 10 and the molten conductor material is filled in the gate side end ring forming portion 22, the slot hole 3, and the counter gate side end ring forming portion 23. Although air is prevented from being discharged into the molten conductor material by discharging air to the outside, a vacuum pump is connected to the air discharge port 16 to exhaust the air in the mold into the cage conductor. Entrainment of air can also be suppressed. Thereby, a higher quality cage rotor can be obtained.

Embodiment 2. FIG.
FIG. 3 is a cross-sectional view showing a cage rotor manufacturing apparatus according to Embodiment 2 of the present invention, and FIG. 4 shows a connecting plate and a first plate in the cage rotor manufacturing apparatus according to Embodiment 2 of the present invention. It is the perspective view which fractured | ruptured a part of fixed upper mold | type.
In FIG. 3, the squirrel-cage manufacturing apparatus 200 is provided with a connecting plate 25 that integrally connects the movable mold 10 and the second core inner periphery clamping mold 132. The connecting plate 25 is fastened to the iron core inner periphery clamping mold 13 via a nut 24, and is fastened to the movable mold 10 via a bolt 26. The fixed upper mold 9 includes a first fixed upper mold 91 having an annular protrusion 9a and a second fixed upper mold 92 fastened to the first fixed upper mold 91 and attached to a movable plate of a molding machine (not shown). Consists of two parts.

  In FIG. 4A, the connecting plate 25 is manufactured using heat resistant steel such as JIS SKD61 or carbon steel such as JIS S45C. The connecting plate 25 is provided with a bolt through hole 25a for passing the bolt 26 on the outer periphery. Further, an insertion hole 25b for inserting the first fixed upper die 91 is provided on the inner peripheral side of the bolt through hole 25a, and a center hole 25c for inserting the suspension shaft 12 is provided at the center. Is provided.

  In FIG. 4B, the first fixed upper die 91 is manufactured using a heat resistant steel such as JIS SKD61. The first fixed upper die 91 is provided with an annular projection 9a and a convex portion 9b formed intermittently on the side facing the annular projection 9a. A bolt hole 9c for inserting a bolt for fastening the first fixed upper mold 91 and the second fixed upper mold 92 is provided in the convex portion 9b. Then, the convex portion 9b of the first fixed upper mold 91 is inserted into the insertion hole 25b of the connecting plate 25, and the first fixed upper mold 91 is fastened to the second fixed upper mold 92 with a bolt (not shown). Further, the deformable member 18 is installed between the connecting plate 25 and the second fixed upper mold 92. Since other components are the same as those of the manufacturing apparatus 100 shown in the first embodiment, the same reference numerals are given and description thereof is omitted.

Next, a method for manufacturing a cage rotor will be described.
As in the first embodiment, the molten conductor material poured into the hot water reservoir 19 fills the inside of the gate side end ring forming portion 22, the slot hole 3, and the anti-gate side end ring forming portion 23, and then the molten conductor material. When the material is pressurized at a pressure of 40 MPa or more by the plunger 20, the pressure of the plunger 20 is changed through the first iron core inner periphery clamping mold 131, the rotor core 5, the second iron core inner periphery clamping mold 132, and the connecting plate 25. Acts to shrink 18. When the deformable member 18 contracts, the movable mold 10 moves in the stacking direction together with the rotor core 5, and the pressure by the plunger 20 acts on the molten conductor material filled in the anti-gate side end ring forming portion 23. become.

  At this time, since the movable mold 10 is integrally connected to the core inner periphery clamping mold 13 via the connecting plate 25, the movable mold 10 and the core inner periphery clamping mold 13 are the outer periphery of the end surface of the rotor core 5. And the rotor core 5 are moved in the stacking direction while sandwiching the inner peripheral portion and the end surface inner peripheral portion. As a result, there is no gap between the circular magnetic steel plates 4 constituting the rotor core 5, and the penetration of the molten conductor material can be prevented more reliably. Further, since the upward force applied to the movable mold 10 is supported by the connecting plate 25, the outer peripheral portion of the rotor core 5 is not subjected to the shearing force by the movable mold 10, and the rotor core 5 can be prevented from being damaged. .

  According to the present embodiment, the movable mold 10 that sandwiches the outer peripheral portion of the end surface of the rotor core 5 and the inner peripheral sandwich die 13 that sandwiches the inner peripheral portion of the end surface of the rotor core 5 are integrally connected. By providing the connecting plate 25, the movable mold 10 and the core inner periphery clamping mold 13 rotate while the end surface outer peripheral portion and the end surface inner peripheral portion of the rotor core 5 are sandwiched when the molten conductor material is pressed. Since it moves in the stacking direction together with the core 6, no gap is formed between the circular magnetic steel plates 4, and the intrusion of the molten conductor material can be prevented more reliably. Further, since the movable mold 10 and the core inner peripheral clamping mold 13 are integrally connected by the connecting plate 25 as described above, generation of shearing force on the outer peripheral portion of the rotor core 5 can be suppressed, so that the rotor Damage to the iron core 5 can be prevented. Furthermore, as with the first embodiment, the occurrence of shrinkage defects in the end ring can be suppressed with a simple molding machine. Therefore, a cage rotor with higher quality and higher reliability can be obtained.

Embodiment 3 FIG.
FIG. 5 is a cross-sectional view showing a cage rotor manufacturing apparatus according to Embodiment 3 of the present invention. In FIG. 5, in the cage rotor manufacturing apparatus 300, the first deformable member 18 is provided between the fixed upper mold 9 and the second iron core inner periphery clamping mold 132, and the fixed upper mold 9 and the movable mold 10. The second deformation member 27 is provided between the two. Each of the first deformable member 18 and the second deformable member 27 has a characteristic of holding the rotor core 5 and the movable mold 10 so as not to move when the molten conductor material is filled, and deforming by the applied pressure after the filling is completed. For example, it is formed of an elastic body such as a spring or an elastic-plastic body such as an aluminum alloy ring member. Other components are the same as those of the manufacturing apparatus 100 shown in the first embodiment, and thus the same reference numerals are given and description thereof is omitted.

Next, a method for manufacturing a cage rotor will be described.
In the same manner as in the first embodiment, the molten conductor material poured into the hot water pool portion 19 is filled into the gate side end ring forming portion 22, the slot hole 3 and the anti-gate side end ring forming portion 23 by the plunger 20. At this time, the 1st deformation member 18 and the 2nd deformation member 27 hold | maintain so that the movable metal mold | die 10 and the iron core inner periphery clamping mold | type 13 may not move, without changing with the inflow resistance at the time of filling.

  Then, after the molten conductor material is filled, when the molten conductor material is pressurized by the plunger 20 at a pressure of 40 MPa or more, the pressure of the plunger 20 is changed to the first iron core inner periphery clamping mold 131, the rotor iron core 5, and the second iron core. The first deformable member 18 is contracted via the inner peripheral clamping mold 132, and at the same time, the second deformable member 27 is contracted via the movable mold 10. When the first deformable member 18 and the second deformable member 27 contract, the movable mold 10 and the iron core inner periphery clamping mold 13 move in the stacking direction together with the rotor iron core 5, and the pressure by the plunger 20 is increased on the side of the anti-pouring gate. This acts on the molten conductor material filled in the end ring forming portion 23. At this time, the upward force applied to the movable mold 10 is supported by the second deformable member 27, so that the shearing force by the movable mold 10 is not applied to the outer peripheral portion of the rotor core 5, thereby preventing damage to the rotor core 5. be able to.

  According to the present embodiment, by providing the deformable members 18 and 27 between the movable mold 10 and the iron core inner periphery clamping mold 13 and the fixed upper mold 9, the upward force applied to the movable mold 10 is increased. Since it is supported by this deformable member, generation of shearing force on the outer peripheral portion of the rotor core 5 can be suppressed, and damage to the rotor core 5 can be prevented. Further, similarly to the first and second embodiments, it is possible to reliably prevent the molten conductor material from entering between the circular magnetic steel plates 4 and to suppress the occurrence of shrinkage defect of the end ring with a simple molding machine. Therefore, a cage rotor with higher quality and higher reliability can be obtained.

It is sectional drawing of the manufacturing apparatus of the cage rotor which shows Embodiment 1 of this invention. It is sectional drawing of the cage rotor manufactured with the manufacturing apparatus of the cage rotor which shows Embodiment 1 of this invention. It is sectional drawing of the manufacturing apparatus of the cage rotor which shows Embodiment 2 of this invention. It is a perspective view of the principal part in the manufacturing apparatus of the cage rotor which shows Embodiment 2 of this invention. It is sectional drawing of the manufacturing apparatus of the cage rotor which shows Embodiment 3 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Cage rotor, 3 Slot hole, 4 Circular magnetic steel plate, 5 Rotor iron core, 6 Cage conductor, 7 Slot bar, 8a, 8b End ring 9, 91, 92 Fixed upper mold, 10 Movable mold, 11 Fixed Lower mold, 13, 131, 132 Iron core inner periphery clamping type, 18, 27 Deformable member, 19 Hot water reservoir, 20 Plunger (pressurizing means), 22 Gate side end ring forming part (first end ring forming part), 23 Anti-pouring side end ring forming portion (second end ring forming portion), 25 connecting plate.

Claims (6)

A rotor core in which a plurality of circular magnetic steel plates are laminated to form a cylindrical shape and a plurality of slot holes penetrating in the stacking direction are concentrically arranged, and a plurality of slot bars disposed in each of the slot holes And an apparatus for manufacturing a cage rotor comprising a cage conductor formed of a pair of annular end rings formed on both end faces in the stacking direction of the rotor core and connected to the slot bar,
A movable mold provided so as to be movable in the stacking direction of the rotor core, sandwiching the outer peripheral portion of the end surface of the rotor core,
A fixed lower mold that forms a first end ring forming portion and a hot water reservoir communicating therewith in cooperation with one end face of the rotor core and the movable mold;
A fixed upper mold that forms a second end ring forming portion in cooperation with the other end surface of the rotor core and the movable mold;
A squirrel-cage rotor manufacturing apparatus comprising pressurizing means for filling and pressurizing a molten conductor material into the first end ring forming portion, the slot hole, and the second end ring forming portion from the hot water pool portion. .   The squirrel-cage rotor manufacturing apparatus according to claim 1, further comprising an iron core inner periphery clamping type for clamping an end surface inner periphery of the rotor iron core.   3. The squirrel-cage rotor manufacturing apparatus according to claim 2, further comprising a connecting plate that integrally connects the movable mold and the iron core inner periphery clamping mold.   3. A deformable member is provided between at least one of the movable mold and the iron core inner periphery clamping mold and the fixed upper mold to allow the movable mold to move when the molten conductor material is pressed. The squirrel-cage rotor manufacturing apparatus described in 1.   4. The apparatus for manufacturing a cage rotor according to claim 3, wherein a deformable member is provided between the connecting plate and the fixed upper mold to allow movement of the movable mold when the molten conductor material is pressed. . A rotor core in which a plurality of circular magnetic steel plates are laminated to form a cylindrical shape and a plurality of slot holes penetrating in the stacking direction are concentrically arranged, and a plurality of slot bars disposed in each of the slot holes And a method of manufacturing a cage rotor including a cage conductor formed of a pair of annular end rings formed on both end faces in the stacking direction of the rotor core and connected to the slot bar,
Laminating the circular magnetic steel plates to form a rotor core in a cylindrical shape;
Clamping the outer peripheral portion of the end surface of the rotor core with a movable mold;
The end face of the rotor core, the movable mold, and the fixed mold cooperate to form a first end ring forming portion that communicates with the hot water reservoir, and the first end ring through the slot hole. Forming a second end ring forming portion communicated with the forming portion;
Filling the molten conductor material into the first end ring forming portion, the slot hole and the second end ring forming portion from the hot water pool portion;
And a step of moving the movable mold in the laminating direction together with the rotor core while pressurizing the molten conductor material to form a cage conductor.

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