Rotor manufacturing device

Abstract

A rotor manufacturing device is provided with a first mold (16), a second mold (17), and a gate plate (18). The gate plate (18) and the second mold (17) have formed therein a passage (24) through which the resin injected from the nozzle (19) flows toward the housing hole (13) when the first mold (16) and the second mold (17) are clamped. The passage (24) has corner sections (28, 32), an upstream section located upstream of the corner sections (28, 32), and a downstream section located downstream of the corner sections (28, 32). Resin reservoirs (29, 33) are formed at positions adjacent to the corner portions (28, 32) in the gate plate (18) and at positions extending linearly from the upstream portion toward the downstream, the resin reservoirs (29, 33) retaining the resin from the nozzle (19) at the initial stage of injection.

Description

Technical Field

[0001] This disclosure relates to an apparatus for manufacturing rotors. Background Technology

[0002] The rotor of the magnet-embedded motor has a core constructed by stacking multiple iron chips along the thickness direction. Multiple receiving holes are formed in this core, extending along the stacking direction of the iron chips. Magnets are housed in each of the multiple receiving holes. These magnets are fixed to the core by filling the receiving holes with resin. The fixing of the magnets relative to the core is performed, for example, using the rotor manufacturing apparatus shown in Patent Document 1.

[0003] The aforementioned manufacturing apparatus is an injection molding machine that injects liquid resin into the receiving hole of a core, and includes a first mold, a second mold, and a sprue plate. A core containing a magnet is disposed between the first mold and the second mold after mold opening. Furthermore, a sprue plate is disposed between the core and the second mold. A passage is formed in the sprue plate and the second mold for allowing resin injected from the nozzle to flow into the receiving hole of the core when the first mold and the second mold are closed.

[0004] When the first mold and the second mold are closed, resin injected from the nozzle flows through a passage formed in the sprue plate and the second mold into a receiving hole in the core where the magnet is housed. The resin cures, thereby fixing the magnet in the receiving hole to the core. Then, when the first mold and the second mold are opened, the sprue plate is separated from the core, and the cured resin remaining in the passage is removed from the sprue plate. Furthermore, the core, with the magnet fixed in place, is removed from between the opened first mold and the second mold.

[0005] Thermosetting resins and thermoplastic resins can be used as the resins for fixing the magnet to the core. When using a thermoplastic resin, the resin filling the receiving hole can solidify more quickly than when using a thermosetting resin. That is, the thermoplastic resin, which melts upon heating, fills the receiving hole. Then, as the temperature of the thermoplastic resin filling the receiving hole decreases, it solidifies rapidly. Therefore, when repeatedly performing the manufacturing cycle of fixing the magnet to the core using a rotor manufacturing apparatus, one manufacturing cycle can be shortened, thus improving manufacturing efficiency.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: International Publication No. 2016 / 147211 Summary of the Invention

[0009] The problem that the invention aims to solve

[0010] However, if a thermoplastic resin is used as the aforementioned resin, the solidification of the resin tends to accelerate as the temperature of the resin inside the nozzle decreases from the end of the initial injection to the next injection. In this case, if the resin injection from the nozzle begins when the first mold and the second mold are closed, the solidified resin will first flow from the nozzle into the passage of the sprue plate and the second mold. Furthermore, if the solidified resin blocks the passage, it will be difficult to properly fill the receiving hole in the core containing the magnet with the molten resin.

[0011] Solution for solving the problem

[0012] A rotor manufacturing apparatus according to one aspect of this disclosure includes a first mold, a second mold, and a sprue plate. A core is disposed between the first mold and the second mold, the core having a plurality of receiving holes for receiving magnets. The sprue plate is disposed between the core and the second mold, and a passage is formed between the sprue plate and the second mold. The passage allows resin injected from a nozzle to flow into the receiving holes when the first mold and the second mold are closed. The rotor manufacturing apparatus fixes the magnets to the core by filling the receiving holes with the resin. The passage has: at least one corner portion that changes the flow direction of the resin; an upstream portion located upstream of the corner portion in terms of resin flow; and a downstream portion located downstream of the corner portion in terms of resin flow. At least one resin accumulation portion is formed on the sprue plate to retain the resin from the nozzle at the initial injection stage. The resin accumulation portion is formed in the sprue plate adjacent to the corner portion and is formed at a position where the upstream portion extends linearly downstream. Attached Figure Description

[0013] Figure 1 It is a three-dimensional view showing the core of the rotor.

[0014] Figure 2 It means Figure 1 A sectional view of the longitudinal section of the core.

[0015] Figure 3 It indicates that it is used for manufacturing. Figure 1 A cross-sectional view of the manufacturing apparatus of the first embodiment of the rotor.

[0016] Figure 4 This indicates the process of rotor manufacturing. Figure 3 A cross-sectional view of the manufacturing apparatus.

[0017] Figure 5 This indicates the process of rotor manufacturing. Figure 3 A cross-sectional view of the manufacturing apparatus.

[0018] Figure 6 This indicates the process of rotor manufacturing. Figure 3 A cross-sectional view of the manufacturing apparatus.

[0019] Figure 7 This indicates the view from the first mold side. Figure 3 A top view of the state of the sprue plate in the manufacturing apparatus.

[0020] Figure 8 This is a cross-sectional view showing the manufacturing apparatus of the second embodiment.

[0021] Figure 9 This indicates the process of rotor manufacturing. Figure 8 A cross-sectional view of the manufacturing apparatus.

[0022] Figure 10 This indicates the process of rotor manufacturing. Figure 8 A cross-sectional view of the manufacturing apparatus.

[0023] Figure 11 This indicates the process of rotor manufacturing. Figure 8 A cross-sectional view of the manufacturing apparatus.

[0024] Figure 12 This indicates the process of rotor manufacturing. Figure 8 A cross-sectional view of the manufacturing apparatus.

[0025] Figure 13 This is a cross-sectional view showing another example of a rotor manufacturing apparatus.

[0026] Figure 14 It means to observe from above. Figure 13 A schematic diagram of the resin pathway in the manufacturing apparatus.

[0027] Figure 15 It indicates viewing from the side. Figure 14 A schematic diagram of the pathway status. Detailed Implementation

[0028] [First Implementation Method]

[0029] The following is for reference Figures 1 to 7 The first embodiment of the rotor manufacturing apparatus will be described below.

[0030] like Figure 1 As shown, the rotor 10 of the magnet-embedded motor has a core 12. The core 12 is constructed by stacking multiple iron chips 11 in a disc shape, which are electromagnetic steel plates, along the thickness direction.

[0031] A central hole 12a is formed in the core 12. The central hole 12a extends along the centerline of the core 12. Two protrusions 12b are formed on the inner circumferential surface of the central hole 12a. The two protrusions 12b protrude from the inner circumferential surface of the central hole 12a in an opposing manner. The two protrusions 12b extend in the same direction as the centerline of the core 12. A plurality of receiving holes 13 are formed on the outer side of the central hole 12a of the core 12. The receiving holes 13 penetrate the core 12 by extending parallel to the central hole 12a. The plurality of receiving holes 13 are arranged around the centerline of the core 12, thereby being configured to surround the centerline.

[0032] like Figure 2 As shown, a magnet 14 is housed in the receiving hole 13. By filling the receiving hole 13 with resin 15, the magnet 14 is fixed relative to the core 12. A thermoplastic resin is used as the resin 15. Compared to thermosetting resin, the thermoplastic resin allows the resin 15 filled in the receiving hole 13 to cure more quickly. Therefore, by using a thermoplastic resin as the resin 15, the magnet 14 housed in the receiving hole 13 can be quickly fixed relative to the core 12.

[0033] <Rotor Manufacturing Apparatus>

[0034] Next, the manufacturing apparatus for manufacturing the rotor of the rotor 10 by filling the receiving hole 13 of the core 12 with resin 15 will be described.

[0035] like Figure 3 and Figure 4 As shown, the rotor manufacturing apparatus includes a first mold 16, a second mold 17, and a sprue plate 18. The first mold 16 and the second mold 17 are... Figure 3 As shown, the molds are in a separated position when they open, and this is accompanied by mold closing, as... Figure 4 As shown, they are close to each other. In the rotor manufacturing apparatus, the opening and closing of the first mold 16 and the second mold 17 are performed alternately and repeatedly. The second mold 17 is provided with a nozzle 19 for injecting molten resin 15. A heater 20 is arranged around the nozzle 19. By heating the nozzle 19 with the heater 20, the temperature drop of the resin 15 located in the resin passage 21 of the nozzle 19 can be suppressed.

[0036] A core 12 is disposed between the first mold 16 and the second mold 17 before the resin 15 is filled into the receiving hole 13. Specifically, the core 12, in which the magnet 14 is housed in the receiving hole 13, is disposed together with the intermediate plate 22 and the spacer 23 between the first mold 16 and the second mold 17. The intermediate plate 22 is used to move the core 12 between the first mold 16 and the second mold 17 or to move the core 12 away from between the first mold 16 and the second mold 17.

[0037] A cylindrical post 22a is fixed to the intermediate plate 22. The post 22a passes through the spacer 23 and through the central hole 12a of the core 12. At this time, the spacer 23 is located between the intermediate plate 22 and the core 12. In addition, the relative positions of the spacer 23 and the core 12 with respect to the post 22a in the circumferential direction are fixed. The spacer 23 is used when the core 12 is pulled out from the post 22a. That is, the spacer 23 is pressed in the direction away from the intermediate plate 22 by a pin or the like that passing through the hole 22b of the intermediate plate 22. When the core 12 is pushed using the spacer 23, the core 12 is pulled out from the post 22a.

[0038] A sprue plate 18 is disposed between the first mold 16 and the second mold 17. The sprue plate 18 forms a passage 24 for the resin 15 injected from the nozzle 19 to flow into the receiving hole 13 of the core 12 when the first mold 16 and the second mold 17 are closed. It is conceivable that the sprue plate 18 and the core 12 are transported integrally between the first mold 16 and the second mold 17, thereby disposing the sprue plate 18 between the core 12 and the second mold 17. Alternatively, the sprue plate 18 may be disposed between the core 12 and the second mold 17 after the core 12 has been transported between the first mold 16 and the second mold 17.

[0039] A sprue plate 18, positioned between the core 12 and the second mold 17, is connected to the core 12. The circumferential position of the sprue plate 18 relative to the post 22a of the intermediate plate 22 is fixed by a pin 25. When the first mold 16 and the second mold 17 are closed, the aforementioned passage 24 is formed in the sprue plate 18 and the second mold 17. In this state, as... Figure 5 As shown, molten resin 15 is injected from nozzle 19, and the resin 15 flows in passage 24 to fill the receiving hole 13 of core 12. The resin 15 filled into the receiving hole 13 in this way solidifies, thereby fixing the magnet 14 housed in the receiving hole 13 relative to core 12.

[0040] After that, as Figure 6 As shown, the first mold 16 and the second mold 17 are opened. It is conceivable that the sprue plate 18, which contacts the core 12, is removed from the core 12 and the pillar 22a when the first mold 16 and the second mold 17 are opened. Alternatively, the removal of the sprue plate 18 from the core 12 and the pillar 22a can also be performed after the core 12 and the intermediate plate 22 have been moved together between the first mold 16 and the second mold 17. The sprue plate 18 removed from the core 12 and the pillar 22a is reused after the cured resin 15, which was not filled in the receiving hole 13 of the core 12, is removed.

[0041] <Details of Pathway 24>

[0042] Next, pathway 24 will be explained in detail.

[0043] like Figure 4 As shown, the passage 24 has: a main channel 26 extending in a straight line and connected to the nozzle 19; and a plurality of branch channels 27 branching from the main channel 26. The main channel 26 is formed in the second mold 17 in a manner that extends along the direction of approach or separation between the first mold 16 and the second mold 17. The branch channels 27 extend along... Figure 4 The boundary between the sprue plate 18 and the second mold 17 is in a direction orthogonal to the main runner 26, i.e. Figure 4 It extends in the left and right directions. The runner 27 is connected to the receiving hole 13 of the core 12 by bending. The part of the runner 27 that is connected to the receiving hole 13 is called the gate part 27a.

[0044] The point where the main channel 26 and the branch channel 27 intersect in the passage 24 becomes the point where the resin 15 injected from the nozzle 19 ( Figure 5 The corner 28 is where the flow direction changes. This corner 28 functions as the first corner located at the connection between the main flow channel 26 and the branch flow channel 27.

[0045] Around the corner 28 of the passage 24, the main flow channel 26 serves as an upstream section of the flow of resin 15 upstream of the corner 28, and the branch flow channel 27 serves as a downstream section of the flow of resin 15 downstream of the corner 28. A resin accumulation section 29 is formed in the sprue plate 18 at a position adjacent to the corner 28 and at a location where the main flow channel 26 extends linearly downstream. This resin accumulation section 29 is formed in a manner corresponding to the corner 28.

[0046] During the period from the end of resin injection from nozzle 19 until the next injection, the curing of resin 15 tends to accelerate as the temperature of resin 15 within the resin passage 21 of nozzle 19 decreases. To suppress this phenomenon, nozzle 19 is heated by heater 20. However, in the region of resin passage 21 at the tip of nozzle 19 that does not correspond to heater 20, the temperature of resin 15 cannot be prevented from decreasing. Therefore, during the period until the next injection of resin 15, the curing of resin 15 intensifies in the region of resin passage 21 at the tip of nozzle 19 that does not correspond to heater 20.

[0047] As a result, in the initial stage of injection of resin 15 from nozzle 19, the injected resin 15 is cured resin 15 located in the aforementioned region. The resin accumulation section 29 is used to retain the cured resin 15 from the initial stage of injection from nozzle 19. The volume V of the resin accumulation section 29 is set to be larger than the volume of the region in the resin passage 21 at the tip of nozzle 19 that does not correspond to heater 20.

[0048] Figure 7 Viewed from the first mold 16 side Figure 4 The state of the gating plate 18. According to... Figure 7 It can be seen that the runner 27 branches at its end opposite to the end of the corner portion 28, in a manner connected to the two gate portions 27a. The branched portion in the runner 27 becomes a corner portion 30 that changes the flow direction of the resin 15. This corner portion 30 functions as a second corner portion located at the bend in the runner 27.

[0049] Around the corner 30 of the passage 24, the portion of the branch channel 27 closer to the corner 28 than the corner 30 serves as an upstream portion of the flow of resin 15 upstream of the corner 30. Conversely, the portion of the branch channel 27 closer to the gate 27a than the corner 30 serves as a downstream portion of the flow of resin 15 downstream of the corner 30. A resin accumulation section 31 is formed in the gate plate 18 adjacent to the corner 30, extending linearly downstream from the portion of the branch channel 27 closer to the corner 28 than the corner 30. This resin accumulation section 31 is formed in a manner corresponding to the corner 30.

[0050] The portion of the runner 27 located downstream of the corner portion 30 and connected to the gate portion 27a becomes the corner portion 32, which changes the flow direction of the resin 15. This corner portion 32 also functions as a second corner portion located at the bend in the runner 27.

[0051] Around the corner 32 of the passage 24, the portion of the runner 27 closer to the corner 30 than the corner 32 serves as an upstream portion of the flow of resin 15 upstream of the corner 32. Furthermore, the gate portion 27a of the runner 27 serves as a downstream portion of the flow of resin 15 downstream of the corner 32. A resin accumulation portion 33 is formed in the gate plate 18 at a position adjacent to the corner 32, extending linearly downstream from the portion of the runner 27 closer to the corner 30 than the corner 32. This resin accumulation portion 33 is formed in a manner corresponding to the corner 32.

[0052] Multiple corner portions 28, 30, and 32 are spaced apart in the flow direction of the resin 15 in the passage 24. Furthermore, multiple resin accumulation portions 29, 31, and 33 are provided corresponding to the corner portions 28, 30, and 32. Among the multiple corner portions 28, 30, and 32, corner 28 is the corner that the resin 15 injected from the nozzle 19 will reach first. The resin accumulation portion 29, having a volume V, is formed in a manner corresponding to this corner portion 28. Similarly, resin accumulation portions 31 and 33 are also used to retain the cured resin 15 from the initial injection stage from the nozzle 19.

[0053] Next, the effects of the rotor manufacturing apparatus in this embodiment will be explained.

[0054] (1) When using thermoplastic resin as the resin 15 to fill the receiving hole 13 in the core 12 where the magnet 14 is housed, the following phenomenon occurs: When the injection of resin 15 from nozzle 19 begins when the first mold 16 and the second mold 17 are closed, the cured resin 15 first flows from nozzle 19 to the passage 24 of the sprue plate 18 and the second mold 17. As the cured resin 15 passes through the corners 28, 30, and 32 of the passage 24, it travels from the upstream to the downstream of the passage 24 without changing direction, and thus enters the resin accumulation sections 29, 31, and 33 and remains there. In this way, the flow of the cured resin 15 to the downstream of the passage 24 is suppressed because it is captured in the resin accumulation sections 29, 31, and 33. Furthermore, the molten resin 15 following the cured resin 15 passes through the downstream portion of the passage 24 and fills the receiving hole 13 of the core 12. Therefore, it is possible to prevent the passage 24 from becoming blocked due to the flow of the cured resin 15 downstream, and to prevent the resin 15 from being properly filled into the receiving hole 13 of the core 12 due to such blockage. As a result, thermoplastic resin can be properly filled into the receiving hole 13 in the core 12 where the magnet 14 is housed.

[0055] (2) If the cured resin 15 blocks the gate portion 27a in the runner 27 of the passage 24, the high-pressure resin 15 will flow to other gate portions 27a in the same runner 27 as the gate portion 27a. Furthermore, since the high-pressure resin 15 flows into the receiving hole 13, the filling pressure of the resin 15 in the receiving hole 13 increases, and the core 12 may deform. However, by suppressing the blockage at the gate portion 27a, the aforementioned deformation in the core 12 can be suppressed.

[0056] (3) Multiple corner portions 28, 30, and 32 are spaced apart in the flow direction of the resin 15 in the passage 24. Multiple resin accumulation portions 29, 31, and 33 are formed in a manner corresponding to the multiple corner portions 28, 30, and 32. Therefore, by using any one of the multiple resin accumulation portions 29, 31, and 33 to capture the resin 15 from the initial injection stage of the nozzle 19 and to solidify the resin 15, the solidified resin 15 is less likely to flow downstream of the passage 24. As a result, the blockage of the passage 24 by the solidified resin 15 can be further effectively suppressed.

[0057] (4) The resin storage section 29 is formed in such a way that it corresponds to the corner section 28 to which the resin 15 injected from the nozzle 19 will first reach. Therefore, the cured resin 15 can be captured in the resin storage section 29 at an earlier time when the resin from the initial injection of the resin from the nozzle 19 flows into the passage 24.

[0058] (5) The nozzle 19 is heated by the heater 20 to prevent the resin 15 inside the nozzle 19 from curing. Even in this case, since it is difficult to place the heater 20 at the tip of the nozzle 19, the resin 15 in the resin passage 21 at the tip of the nozzle 19 is prone to curing in areas not corresponding to the heater 20. It is conceivable that in this case, the volume V of the resin storage section 29 is set to be larger than the volume of the area in the resin passage 21 at the tip of the nozzle 19 where the heater 20 is not placed. Therefore, the resin storage section 29 can easily capture the resin 15 from the initial injection of the nozzle 19 and the cured resin 15.

[0059] (6) The passage 24 has a main channel 26 extending in a straight line and connected to the nozzle 19, and a plurality of branch channels 27 branching from the main channel 26. The branch channels 27 are connected to the receiving hole 13 by bending. The corner portion 28 serves as a first corner portion located at the connection between the main channel 26 and the branch channels 27. In addition, the corner portions 30 and 32 serve as second corner portions located at the bending portion in the branch channels 27. The resin accumulation portion 29 is formed in a manner corresponding to the corner portion 28. The resin accumulation portions 31 and 33 are formed in a manner corresponding to the corner portions 30 and 32, respectively. Therefore, the resin 15 from the initial injection stage of the nozzle 19 and the cured resin 15 can be captured at an earlier time after resin injection using the resin accumulation portion 29 provided corresponding to the corner portion 28. Furthermore, any cured resin 15 that is not completely captured by the resin accumulation section 29 is captured by the resin accumulation sections 31 and 33, which are provided corresponding to the corner sections 30 and 32. Therefore, the flow of the cured resin 15 downstream of the passage 24 can be more effectively prevented by the resin accumulation sections 29, 31, and 33.

[0060] [Second Implementation]

[0061] Next, refer to Figures 8-12 A second embodiment of the rotor manufacturing apparatus will be described.

[0062] like Figure 8 As shown, the rotor manufacturing apparatus of this embodiment differs from the rotor manufacturing apparatus of the first embodiment in that it assembles the sprue plate 18 onto the second mold 17. Figure 8 It can be seen that the second mold 17 has a main body block 41, a passage block 42 and an eject block 43.

[0063] The discharge block 43 is positioned closer to the first mold 16 than the main body block 41. The passage block 42 runs along the direction in which the first mold 16 approaches or recedes from the second mold 17, i.e. Figure 8 The main body block 41 and the discharge block 43 are connected vertically. The passage block 42 is used to form the main channel 26 of the passage 24. The discharge block 43 can move relative to the main body block 41 and the passage block 42 in the direction of approaching or leaving the main body block 41.

[0064] The sprue plate 18 is positioned offset from the discharge block 43 within the first mold 16. The sprue plate 18 is connected to the main body block 41 and the discharge block 43 via a guide rod 44. The sprue plate 18 is capable of relative movement with respect to the main body block 41 and the discharge block 43 in an approaching or distancing direction. This relative movement of the sprue plate 18 is guided by the guide rod 44.

[0065] Between the first mold 16 and the second mold 17, and more specifically between the sprue plate 18 and the first mold 16, the core 12 containing the magnet 14 is arranged together with the intermediate plate 22 and the spacer 23 in the receiving hole 13. Then, when the first mold 16 and the second mold 17 are closed, the sprue plate 18 connects to the core 12, and the discharge block 43 connects to the sprue plate 18 and the main body block 41. At this time, a passage 24 is formed between the second mold 17 and the sprue plate 18.

[0066] When the first mold 16 and the second mold 17 are closed, as Figure 9 As shown, resin 15 is injected from nozzle 19 through passage 24 into the receiving hole 13 of core 12. Then, as... Figures 10-12 As shown, the first mold 16 and the second mold 17 are opened. More specifically, as... Figure 10 As shown, the main body block 41, the passage block 42, and the discharge block 43 are moved away from the sprue plate 18. As a result, the resin 15 that has cured in the passage 24 during mold closing is pulled out from the sprue plate 18 together with the main body block 41 and the discharge block 43.

[0067] After that, as Figure 11 As shown, the discharge block 43 is moved away from the main body block 41. This causes the resin 15 to move in the extraction direction from the passage block 42. Furthermore, as... Figure 12 As shown, the main body block 41, passage block 42, discharge block 43, and sprue plate 18 are moved away from the first mold 16. In this state, the resin 15 is removed from the passage block 42 and discharge block 43.

[0068] According to this embodiment, the same effect as that of (1) to (6) of the first embodiment can be obtained.

[0069] [Other implementation methods]

[0070] Furthermore, the above embodiments can be modified as follows. The above embodiments and the following modifications can be combined with each other to implement them within the scope of technical non-contradiction.

[0071] It can also replace nozzle 19, and such as Figure 13 The nozzle 49, which functions as a heat dissipation channel, is arranged in the second mold 17. In this case, as shown... Figure 14 and Figure 15 As shown, corner portions 45 and 46 are formed at the locations in the passage 24 where the sprue plate 18 passes through. Furthermore, resin accumulation portions 47 and 48 are formed on the sprue plate 18 corresponding to the corner portions 45 and 46.

[0072] Alternatively, at least one of the resin storage sections 29, 31, and 33 may be retained while the others are omitted.

[0073] The volume V of the resin storage section 29 can also be appropriately changed.

Claims

1. A rotor manufacturing apparatus, wherein, The rotor manufacturing apparatus includes a first mold, a second mold, and a sprue plate. A core is disposed between the first mold and the second mold, the core having multiple storage holes for accommodating magnets. The sprue plate is disposed between the core and the second mold. A passage is formed in the sprue plate and the second mold, the passage allowing resin injected from the nozzle to flow into the receiving hole when the first mold and the second mold are closed. The rotor manufacturing apparatus fixes the magnet to the core by filling the receiving hole with resin, wherein... The passage has: at least one corner portion that changes the flow direction of the resin; an upstream portion located upstream of the corner portion in terms of resin flow; and a downstream portion located downstream of the corner portion in terms of resin flow. The sprue plate has at least one resin accumulation portion formed to retain the resin during the initial injection from the nozzle. The resin accumulation portion is formed in the sprue plate at a position adjacent to the corner portion and at a position where the upstream portion extends in a straight line toward the downstream portion.

2. The rotor manufacturing apparatus according to claim 1, wherein, The at least one corner portion includes a plurality of corner portions arranged at intervals in the flow direction of the resin in the passage. The at least one resin storage section includes a plurality of resin storage sections formed in such a manner as to correspond to the plurality of corner sections.

3. The rotor manufacturing apparatus according to claim 1, wherein, The at least one corner portion includes a plurality of corner portions arranged at intervals in the flow direction of the resin in the passage. The at least one resin storage section includes a resin storage section formed in such a way as to correspond to the corner of the plurality of corner sections to which the resin injected from the nozzle first reaches.

4. The rotor manufacturing apparatus according to claim 3, wherein, The volume of the resin storage section, which is formed in a manner corresponding to the corner where the resin injected from the nozzle first reaches, is set to be larger than the volume of the area in the resin passage at the tip of the nozzle that does not correspond to the heater.

5. The rotor manufacturing apparatus according to claim 4, wherein, The passage has a main channel extending in a straight line and connected to the nozzle, and multiple branch channels branching from the main channel. The distribution channel is connected to the receiving hole by bending. The at least one corner portion includes a first corner portion located at the connection between the main channel and the branch channel, and a second corner portion located at a bend in the branch channel. The at least one resin accumulation section includes a resin accumulation section formed in a manner corresponding to the first corner section, and a resin accumulation section formed in a manner corresponding to the second corner section. The volume of the resin storage section corresponding to the first corner is set to be larger than the volume of the area in the resin passage at the tip of the nozzle that does not correspond to the heater.

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