Method and apparatus for manufacturing a core part of a rotating electrical machine

Abstract

To provide a method for manufacturing a core unit capable of executing separation from a jig without adversely affecting a thin plate forming an iron core body of the core unit by appropriately applying force to the core unit when separating the jig from the core unit in a core unit manufacturing process.SOLUTION: When a jig 20 is separated from a core unit 10 obtained through a filling process in a separation process, a push-up unit 41 of a separation mechanism 40 in contact with the core unit 10 through the jig 20 is brought into contact with a position in the vicinity of a non-circumferential section of an inner peripheral section and directly opposing it in an iron core body 11 of the core unit 10, so that force can be efficiently applied from the push-up unit 41. As a result, even if the non-circumferential section of the iron core body 11 receives frictional resistance to a post section 22, it is less likely to produce stress based on deviation of force applied to the iron core body 11 in each section of the iron core body 11, so that adverse effect such as deformation to a thin plate that forms the core main part 11 can be suppressed, and the core unit 10 can be satisfactorily separated from the jig 20.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a method and an apparatus for manufacturing a core portion of a rotor or stator of a rotating electrical machine. [Background technology]

[0002] 2. Description of the Related Art In the stators or rotors of rotating electrical machines such as electric motors and generators, laminated cores are generally used as cores in which coils and permanent magnets are disposed. Various methods have been used to arrange coils and permanent magnets in the core of such laminated cores.

[0003] For example, in the case of rotor cores, particularly those of interior permanent magnet (IPM) motors, a structure has been adopted in which magnets are inserted and fixed into magnet insertion holes in a laminated iron core. In this structure, when fixing a permanent magnet, after inserting the permanent magnet into the magnet insertion hole, the gap in the magnet insertion hole excluding the part where the permanent magnet exists is filled with a resin such as a thermosetting resin to fill the gap and fix the permanent magnet.

[0004] Conventionally, a method has been adopted in which a jig is placed below the laminated core so that the processes of inserting permanent magnets into the magnet insertion holes of the laminated core and filling the laminated core with resin can be carried out without any problems. Examples of conventional methods of using jigs in manufacturing cores for rotating electric machines include those disclosed in Japanese Patent Application Laid-Open Nos. 2016-134967 and 2019-140841. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-134967 [Patent Document 2] Japanese Patent Application Publication No. 2019-140841 Summary of the Invention [Problem to be solved by the invention]

[0006] Conventional rotating electric machine cores are manufactured using the methods shown in the above-mentioned patent documents, in which a jig (transport pallet, support member) is placed below the laminated core to hold the magnets inserted into the magnet insertion holes of the laminated core, and resin is then efficiently filled into the magnet insertion holes, ensuring the laminated core and magnets are integrated.

[0007] In the manufacture of such conventional cores, the jig used typically has a base on which the laminated core can be placed, and a post that is inserted into a central hole for attaching the shaft of the laminated core and used for positioning.

[0008] After filling the magnet insertion holes in the laminated core with resin and fixing the magnets, the jig is separated from the laminated core. However, because the post portion is inserted through the hole in the center of the laminated core, the post portion must be completely removed from the hole in the laminated core in order to separate it.

[0009] The post portion of the jig is formed with dimensional precision to minimize the gap between it and the central hole of the laminated core in order to position each thin metal plate that makes up the laminated core. Furthermore, since a shaft is attached to the central hole of the laminated core, one or more protrusions are provided on the inner periphery facing the hole of the laminated core to prevent the shaft from rotating. The post portion is provided with recesses that correspond to these protrusions and are designed to engage with the protrusions.

[0010] Therefore, when removing the post from the central hole of the laminated core to separate the laminated core from the jig, the post is likely to come into contact with the inner periphery and protrusions of the laminated core, increasing frictional resistance and the force required for separation. Furthermore, when a force is applied directly to the laminated core to separate it from the jig, the force is usually applied to multiple points on the laminated core, which inevitably results in uneven force distribution in the laminated core. This uneven distribution can cause excessive stress due to the applied force and frictional resistance with the post around the hole of the laminated core, particularly in the protrusions that protrude toward the post and are therefore likely to come into contact with the surrounding posts. This can have adverse effects, such as deformation, on the thin plates that make up the laminated core.

[0011] In response to this, a method has been proposed in which a spacer is interposed between the jig (support member) and the laminated core, and when separating the jig from the laminated core, the spacer is displaced in the axial direction of the post portion, and the laminated core is moved together with the spacer relative to the jig so that force is applied to the laminated core via the spacer, thereby preventing uneven force being applied to the laminated core and suppressing deformation of each thin plate that makes up the laminated core, as shown in Patent Document 2. However, this method requires not only interposing a spacer between the jig and the laminated core, but also providing an additional mechanism for moving this spacer together with the laminated core, which complicates the mechanism for separating the jig from the laminated core and increases costs.

[0012] The present invention has been made to solve the above-mentioned problems, and aims to provide a core part manufacturing method and core part manufacturing device that, when separating a core part from a jig that supports the core part after it has been filled with resin during the core part manufacturing process, can apply an appropriate force to the core part to move it, thereby enabling separation from the jig without adversely affecting the thin plate that forms the core part's iron core body. [Means for solving the problem]

[0013] A core part manufacturing method according to the present disclosure is a core part manufacturing method for manufacturing a core part that forms a part of a rotor or stator of a rotating electric machine, in which a core body formed by laminating a plurality of thin plates made of a magnetic metal material is supported by a jig, and a plurality of spaces in the core body are filled with resin, and the core part that has been obtained through the filling step and the jig are separated by a predetermined separation mechanism, and the jig has a base part on which the core body can be placed and a post part that protrudes from the base part in a substantially columnar shape, and the base part is provided with a plurality of through holes that pass through, and the core body has a central part that passes through in the direction of lamination of the thin plates. The core portion has an axial hole through which the shaft is inserted, and the inner peripheral portion facing the axial hole has one or more non-circumferential portions that prevent rotation of the shaft inserted into the axial hole. During the filling process, the post portion of the jig is inserted into the axial hole and supported, and the separation mechanism has at least a push-up portion that can enter and exit through the through hole relative to the base portion of the jig. During the separation process, the push-up portion of the separation mechanism protrudes relatively to the base portion of the jig and comes into contact with multiple locations on the iron core body of the core portion, including contacted portions that are located on an imaginary line that passes through the center of the axial hole and the non-circumferential portion, and either or both of the jig and the core portion are moved relatively to separate the core portion from the jig.

[0014] As described above, according to the disclosure of the present invention, a core portion is obtained through a filling process in which resin is filled into the hollow portion of the core body supported by a jig. Then, in the separation process, the jig is separated from the core portion. The push-up portion of the separation mechanism, which contacts the core portion through the base portion of the jig, is brought into contact with at least the contactable portion of the core body of the core portion, which is located on an imaginary line passing through the center of the axial hole and the non-circumferential portion of the inner circumference. As the core portion moves relative to the jig, force is efficiently applied to the core body of the core portion from the push-up portion, which contacts the non-circumferential portion in the vicinity of the non-circumferential portion, and the core body is appropriately supported by the push-up portion. As a result, even if the non-circumferential portion of the core body experiences frictional resistance between the post portion, stress due to an imbalance in the force applied to the core body is less likely to occur in various parts of the core body, suppressing adverse effects such as deformation of the thin plate that makes up the core body. As a result, the core portion can be separated from the jig without any problems and sent to the next process, thereby stably manufacturing the core portion. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is an explanatory view showing a state in which a resin material is injected into a core manufacturing device that applies a core manufacturing method according to a first embodiment of the present invention. FIG. [Figure 2] Figure 2(a) is a plan view of a jig used in the core part manufacturing method of the first embodiment of the present invention, Figure 2(b) is a bottom view of the core body used in the core part manufacturing method of the first embodiment of the present invention, and Figure 2(c) is a vertical cross-sectional view of the core body used in the core part manufacturing method of the first embodiment of the present invention in a state supported by the jig. [Figure 3] 3 is an explanatory view showing a state in which the core body is released from clamping by the upper and lower dies of the core manufacturing apparatus in the core manufacturing method according to the first embodiment of the present invention. FIG. [Figure 4] Figure 4(a) is an explanatory diagram of the contact state of the push-up portion with the core body during the separation process in the core part manufacturing method according to the first embodiment of the present invention, and Figure 4(b) is an explanatory diagram of the progress of separation of the core part from the jig during the separation process in the core part manufacturing method according to the first embodiment of the present invention. [Figure 5]4 is an explanatory view showing a state in which separation of the core part from the jig is completed in a separation step in the core part manufacturing method according to the first embodiment of the present invention. FIG. [Figure 6] FIG. 6(a) is a plan view of a core portion obtained by the core portion manufacturing method according to the first embodiment of the present invention, and FIG. 6(b) is a cross-sectional view taken along the line AA of FIG. 6(a). [Figure 7] Figure 7(a) is an explanatory diagram of the state before the jig and lower mold are moved during the separation process in the core part manufacturing method of the second embodiment of the present invention, and Figure 7(b) is an explanatory diagram of the contact state of the push-up part with the core body during the separation process in the core part manufacturing method of the second embodiment of the present invention. [Figure 8] Figure 8(a) is an explanatory diagram showing the progress of separation of the core part from the jig during the separation process in the core part manufacturing method according to the second embodiment of the present invention, and Figure 8(b) is an explanatory diagram showing the completed state of separation of the core part from the jig during the separation process in the core part manufacturing method according to the second embodiment of the present invention. [Figure 9] 10A and 10B are explanatory views of a state in which molten resin is injected in a filling step in a core part manufacturing method according to a third embodiment of the present invention. [Figure 10] FIG. 10 is an explanatory view showing a state in which the core body is released from clamping by the upper and lower dies of the core manufacturing apparatus in the core manufacturing method according to the third embodiment of the present invention. [Figure 11] Figure 11(a) is an explanatory diagram of the state before the push-up portion is moved during the separation process in the core part manufacturing method according to the third embodiment of the present invention, and Figure 11(b) is an explanatory diagram of the contact state of the push-up portion with the core body during the separation process in the core part manufacturing method according to the third embodiment of the present invention. [Figure 12] Figure 12(a) is an explanatory diagram showing the progress of separation of the core part from the jig during the separation process in the core part manufacturing method according to the third embodiment of the present invention, and Figure 12(b) is an explanatory diagram showing the completed state of separation of the core part from the jig during the separation process in the core part manufacturing method according to the third embodiment of the present invention. [Figure 13] Figure 13(a) is a bottom view of a core body used in a core manufacturing method according to another embodiment of the present invention, and Figure 13(b) is a plan view of a jig used in a core manufacturing method according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0016] (First embodiment of the present invention) Hereinafter, a core portion manufacturing apparatus for a rotating electrical machine according to a first embodiment of the present invention will be described with reference to FIGS. In each figure, the core part manufacturing method of this embodiment includes at least a filling process in which resin is filled into multiple spaces in the core body 11 while the core body 11 is supported by a jig 20, and a separation process in which the jig is used to separate the core part 10 obtained through this filling process.In this separation process, the push-up portion 41 of the separation mechanism is protruded relative to the jig 20, and brought into contact with multiple points on the end face of the core body 11 of the core part 10 supported by the jig 20, while the core part 10 is moved relative to the jig 20, separating the core part 10 and the jig 20.

[0017] A core manufacturing apparatus 1 to which the core manufacturing method according to this embodiment is applied fills resin into multiple spaces in a laminated core body 11 while the core body 11 is supported by a jig 20, thereby manufacturing a core 10 that forms a rotor for a rotating electric machine. In detail, the core manufacturing apparatus 1 is configured to include an upper mold 31 and a lower mold 32 as a filling mechanism that fills resin into the core body 11 supported by the jig 20, and a separation mechanism 40 that separates the jig 20 from the core 10 obtained by filling the core body 11 with resin.

[0018] The core 10 manufactured by the core manufacturing method according to this embodiment includes a core body 11 formed by laminating a plurality of thin plates 11a made of a magnetic metal material, permanent magnets 12 inserted into magnet insertion holes 11b as spaces provided in the core body 11, and resin filler material 13 filled into each magnet insertion hole 11b (see FIG. 6). This core 10 has a known structure as a rotor for a rotating electrical machine (electric motor or generator), and detailed description thereof will be omitted.

[0019] The core body 11 is a laminated core formed by stacking a plurality of thin plates 11a made of a magnetic metal material. The thin plates 11a that make up the core body 11 are formed by punching out thin plate material made of electromagnetic steel, amorphous alloy, or the like.

[0020] The core body 11 is provided with a plurality of magnet insertion holes 11b as spaces into which permanent magnets 12 can be inserted. The magnet insertion holes 11b are holes that penetrate the core body 11 in the lamination direction of the thin plates 11a, and are provided in a predetermined arrangement along the circular outer periphery of the core body 11. The position, shape, and number of these magnet insertion holes 11b can be set as appropriate depending on the application, required performance, etc. of the rotating electric machine. Additionally, a shaft hole 11c is provided in the center of the core body 11, penetrating the core body 11 in the lamination direction of the thin plates 11a, and the rotating shaft of the rotor can be inserted and fixed into this shaft hole 11c.

[0021] The inner peripheral portion of core body 11 facing axial hole 11c is formed with a non-circular portion as a rotation stopper so that the rotor shaft inserted into axial hole 11c can be kept fixed without unwanted rotation relative to core body 11. Specifically, the non-circular portion is a convex portion 11d having two corners and protruding into axial hole 11c. In this case, axial hole 11c has a hole shape having a circumferential portion of a predetermined diameter and multiple non-circular portions that are concave with respect to the circle of the circumferential portion. The core body 11 is supported by the jig 20 during the resin filling step by the core manufacturing device 1 and before and after the step, and is handled integrally with the jig 20 until it is separated in the separation step.

[0022] The permanent magnets 12 are arranged to be used for the rotor field by being inserted into the magnet insertion holes 11b of the core body 11. When the permanent magnets 12 are inserted into the magnet insertion holes 11b, a gap is created between the permanent magnets 12 and the core body 11. The remaining portions of the magnet insertion holes 11b excluding the permanent magnets 12 are filled with filler material 13.

[0023] Filler 13 is a resin that is solidified after being injected in a molten state into magnet insertion hole 11b, more specifically, into the remaining portion of magnet insertion hole 11b after inserting permanent magnet 12. The resin that makes up filler 13 is, for example, a thermosetting resin such as epoxy resin, or a thermoplastic resin, and is obtained by melting and then solidifying a resin material supplied as a resin tablet or powdered resin. The filler 13 fixes the permanent magnet 12 in the magnet insertion hole 11b, and also contributes to strengthening the connection between the stacked adjacent thin plates 11a.

[0024] The jig 20 is configured to include a base portion 21 on which the core body 11 can be placed, and a post portion 22 that protrudes from the base portion 21 in a generally columnar shape (see FIG. 2(a)). The base portion 21 is, for example, a rectangular plate-like base member, and supports the core body 11 from below with the core body 11 placed on it and in contact with the lower end surface of the core body 11. The base portion 21 is provided with a plurality of through-holes 21a in the form of oval holes with arc portions and parallel straight portions, in a predetermined arrangement.

[0025] Post portion 22 is formed in a substantially cylindrical shape and disposed so as to protrude upward approximately at the center of the upper surface of base portion 21. Post portion 22 has a substantially cylindrical shape that corresponds to the shape and orientation of axial hole 11c of core body 11, and is capable of being inserted into axial hole 11c of core body 11. Post portion 22 is provided with recessed portion 22a that corresponds to protruding portion 11d on the inner periphery of core body 11, and recessed portion 22a is capable of engaging with protruding portion 11d when post portion 22 is inserted into axial hole 11c.

[0026] When the core body 11 is supported by the jig 20, the post portion 22 is inserted into the axial hole 11c of the core body 11, so that the center c of the post portion 22 is aligned with the center C of the axial hole 11c and the position of the recess 22a is aligned with the position of the protrusion 11d of the core body 11.

[0027] The through holes 21a of the base portion 21 are arranged so as to be symmetrical about the center c of the post portion 22, which coincides with the center C of the axial hole 11c. The holes 21a of the base portion 21 are arranged so that at least one of them is located on an imaginary line L that passes through the center c of the post portion 22 and the recess 22a, and are provided in a shape that is symmetrical about this imaginary line L (see FIG. 2(b)).

[0028] The upper mold 31 and lower mold 32, which form the filling mechanism of the core manufacturing device 1, sandwich the core body 11 and position it between the upper and lower molds, fill the magnet insertion hole 11b, which serves as a space, with resin, and further pressurize the molten resin in the magnet insertion hole 11b while accelerating the solidification of the resin.

[0029] The upper mold 31 and the lower mold 32 sandwich and press the core body 11 supported by the jig 20 from both sides in the stacking direction. This applies a predetermined load to the core body 11 from the height direction, allowing the magnet insertion hole 11b in the core body 11 to be closed.

[0030] In the filling step, the upper mold 31 and the lower mold 32 forming the filling mechanism can fill the resin held on the upper mold 31 side into the magnet insertion hole 11b, which serves as a space in the core body 11, from above.

[0031] The upper die 31 is positioned above the core body 11 placed on the lower die 32, and together with the lower die 32, holds the core body 11 and the jig 20. The upper die 31 is a metal mold formed, for example, in the shape of a rectangular plate, and is configured to have a plurality of accommodating holes 31a that can accommodate and hold resin. The upper die 31 is also configured to have extrusion sections 33 that are arranged so that they can be inserted into the accommodating holes 31a from above, and that can extrude resin into the magnet insertion holes 11b of the core body 11.

[0032] The accommodation holes 31a are provided so as to be located at positions corresponding to the magnet insertion holes 11b of the core body 11 when the core body 11 is sandwiched between the upper mold 31 and the lower mold 32. A resin material in the form of a resin tablet, powder, or the like is supplied into each of these accommodation holes 31a.

[0033] The upper mold 31 also includes a heater (not shown) that can heat the resin material contained in each of the containing holes 31a, as a mechanism for heating and melting the resin material to obtain the molten resin 81.

[0034] The extrusion portion 33 is capable of extruding the molten resin 81 into the magnet insertion hole 11b of the core body 11, and is configured as, for example, a plurality of plungers that can be moved up and down when driven by a predetermined drive source. Each extrusion section 33 can be driven by a corresponding drive source to move up and down, or multiple extrusion sections can be driven together by a single drive source to move up and down as a unit. The molten resin 81 held in the accommodation hole 31 a is extruded from the accommodation hole 31 a of the upper die 31 by the extrusion section 33 in the filling step, and reaches each magnet insertion hole 11 b of the core body 11 .

[0035] The lower die 32 supports the core body 11 and jig 20 placed thereon, and together with the upper die 31, holds the core body 11 and jig 20 in a sandwiched position. The lower die 32 is a metal mold formed, for example, in the shape of a rectangular plate, and may be provided with a recess or protrusion as needed that fits into a protrusion or recess provided on the underside of the jig 20 to prevent unwanted movement of the jig.

[0036] The separation mechanism 40 is configured to include a push-up portion 41 that can move in and out through a hole 21a in the base portion 21 of the jig 20 when the jig 20 is placed and supported on the lower mold 32, a core portion support portion 42 that can support the core portion 10 after it has separated from the jig 20, and a jig holding portion 43 that holds the jig 20 and prevents the jig 20 from moving together with the core portion 10.

[0037] The push-up portions 41 protrude from the base portion 21 of the jig 20 and move the core portion 10 relative to the jig 20 while coming into contact with a plurality of locations on the end face of the core body 11 of the core portion 10 supported by the jig 20, including the contacted portions 15 located on an imaginary line L passing through the center C of the axial hole 11c and the convex portion 11d on the inner periphery, thereby separating the core portion 10 from the jig 20. Specifically, the push-up portions 41 push the end face of the core body 11 of the core portion 10, enabling the core portion 10 to move relative to the jig 20 in the lamination direction of the thin plates of the core body 11, and are configured as, for example, a plurality of plungers that can be moved up and down when driven by a predetermined drive source.

[0038] The push-up portions 41 are arranged so as to come into contact with a plurality of locations on the end face of the core body 11 of the core portion 10 supported by the jig 20, symmetrically about the center C of the axial hole 11c, in the same manner as the arrangement of the holes 21a in the base portion 21 of the jig 20 when it is placed on and supported by the lower mold 32. By arranging them symmetrically about the center of the axial hole 11c in this way, the force applied to the core body 11 is balanced across the entire end face, making it less likely that the core body 11 will tilt or shift in position relative to the jig 20. This reduces the frictional resistance and accompanying stress that may occur when the core portion 10 is moved relative to the jig 20.

[0039] Each contact surface 41a of the push-up portion 41 that contacts the end surface of the core body 11 of the core portion 10 is shaped symmetrically about the imaginary line L, starting with the contact surface that contacts the contacted portion 15 located on the imaginary line L that passes through the center C of the axial hole 11c and the protrusion 11d. Specifically, the shape of each contact surface 41a of the push-up portion 41 is an ellipse with an arc portion and a parallel straight portion, similar to the shape of each hole 21a in the base portion 21 of the jig 20.

[0040] By making the shape of the contact surface 41a of the push-up portion 41 symmetrical, the contacted portion 15 of the core body 11 that comes into contact with the push-up portion 41 faces the convex portion 11d, which is a non-circumferential portion, and is positioned in a balanced manner near the convex portion.By applying force from the push-up portion 41 to this position, the force acts appropriately and the generation of stress in the core body 11 is suppressed.

[0041] Other than the symmetrical arrangement of the push-up portions 41 and the symmetrical shape of the contact surfaces 41a, the number and shape of the push-up portions 41 are not particularly limited, and may be set as appropriate as long as they can pass through each hole 21a in the base portion 21 of the jig 20 and can stably support and move the core portion 10. For example, the shape of the contact surface of the push-up portion is not limited to an oval shape with an arc portion and parallel straight portions, but can also be a shape consisting of a closed curve such as a circle or ellipse, a shape combining straight lines such as a rectangle, or a shape combining curves and straight lines. Note that the contact surfaces 41a of the push-up portions 41 of the separation mechanism 40 and the holes 21a in the base portion 21 of the jig 20 through which the push-up portions 41 pass are positioned so as not to overlap with the areas of the end face of the core body 11 of the core portion 10 that correspond to the magnet insertion holes 11b. As a result, in the resin filling step, the base portion 21 closes the magnet insertion hole 11b, making it possible to prevent resin from leaking from the magnet insertion hole 11b to the base portion 21 side.

[0042] The core support part 42 supports and moves the core part 10 after it has been moved by the push-up part 41 and separated from the jig 20, thereby enabling the core part 10 to be removed from between the upper and lower molds for transport to the next process.

[0043] When the core part 10 is moved relative to the jig 20 by the push-up part 41, the jig holding part 43 holds the jig 20 so as not to move at least until the core part 10 separates from the jig 20, preventing the jig 20 from moving upward together with the core part 10, and after the core part 10 is separated, the jig 20 is moved while being supported so that it can be removed from between the upper and lower molds.

[0044] Next, a process for manufacturing the core part based on the core part manufacturing method according to this embodiment will be described. It is assumed that the core body 11 has been obtained in advance by a known manufacturing method, by laminating a plurality of thin plates 11a punched from a thin plate material. The core body 11 is then placed on the base 21 of the jig 20, and the post 22 of the jig 20 is inserted into the axial hole 11c. While the core body 11 is supported by the jig 20, the permanent magnets 12 are inserted into the magnet insertion holes 11b. The core body 11 is then preheated to an appropriate temperature, and then transported together with the jig 20 between the upper and lower dies of the core manufacturing device 1 by a predetermined transport mechanism.

[0045] In addition, resin materials as the material for the molten resin 81 are automatically supplied to the storage hole 31a of the upper mold 31 of the core part manufacturing device 1, and these resin materials are heated and melted in the upper mold 31 before injection.

[0046] The core body is carried into the core manufacturing device 1 by the transfer mechanism, and the jig 20 that supports this core body 11 is placed on the lower mold 32, so that it is arranged between the upper and lower molds. Meanwhile, in the upper mold 31 of the core part manufacturing device 1, resin material is held in each storage hole 31a, and the resin material held in each storage hole 31a is heated at an appropriate time, melts in each storage hole 31a, and becomes molten resin 81.

[0047] The upper mold 31 is lowered or the lower mold 32 is raised relative to the core body 11 and jig 20 positioned between the upper mold 31 and the lower mold 32, and the state in which the core body 11 and the jig 20 are clamped and pressed by the upper mold 31 and the lower mold 32 is entered. After the magnet insertion holes 11b of the core body 11 are isolated from the outside by being sandwiched and closed by the upper mold 31 and the lower mold 32, the resin filling step is carried out.

[0048] In the filling process, the extrusion sections 33 inserted into each accommodating hole 31a of the upper die 31 move downward to press the molten resin 81 in each accommodating hole 31a, thereby extruding the molten resin 81 downward from the accommodating hole 31a (see FIG. 1). The extruded molten resin 81 is injected into and fills the magnet insertion holes 11b of the core body 11.

[0049] Once the molten resin 81 filled in each magnet insertion hole 11b has solidified, the permanent magnets 12 have been fixed to the core body 11, and the core portion 10 has been obtained, the extrusion portion 33 is pulled up to return to its original state, and the upper mold 31 is raised or the lower mold 32 is lowered to end the clamping and pressing of the core body 11 by the upper mold 31 and the lower mold 32 (see Figure 3), and the process moves to the separation process.

[0050] In the separation process, the push-up portion 41 of the separation mechanism 40 is moved relative to the core portion 10 supported by the jig 20 so that the push-up portion 41 passes through the hole 21a of the base portion 21 and abuts against the end face of the core body 11 of the core portion 10 placed on the base portion 21 (see FIG. 4(a)). At this time, the push-up portion 41 comes into contact with a plurality of points on the end face of the core body 11, including the contacted portion 15 located on the imaginary line L passing through the center C of the axial hole 11c and the convex portion 11d on the inner periphery. Furthermore, the jig holding portion 43 holds the jig 20 on the lower mold and restricts movement of the jig 20 in all directions, including upward.

[0051] In this state, the push-up portion 41 is moved upward, and the core portion 10 is pushed from below by the push-up portion 41, moving it upward relative to the jig 20. As a result, the end face of the core body 11 in the core portion 10 moves away from the base portion 21 of the jig 20, and the post portion 22 of the jig 20 comes out of the axial hole 11c of the core body 11 (see FIG. 4(b)).

[0052] In addition to the movement of the jig 20 being restricted by the jig holding portion 43, the push-up portion 41 moves only upward, contacting and pushing against multiple symmetrical points on the end face of the core body 11, so that when the core portion 10 is moved relative to the jig 20, no unnecessary movement other than upward movement occurs in the core portion 10, and the frictional resistance generated when the inner periphery, including the convex portion 11d of the core body 11, comes into contact with the post portion 22 of the jig 20 can be kept to a necessary minimum, allowing the core portion 10 to be moved without any problems.

[0053] Furthermore, the position (contacted portion 15) on the end face of the core body 11 where the push-up portion 41 comes into contact and applies a pressing force is located on an imaginary line L passing through the center C of the axial hole 11c and the convex portion 11d, and is located in the vicinity of the convex portion 11d. This prevents excessive stress from occurring in the inner peripheral portion of the core body 11, including the convex portion 11d, and prevents deformation of the thin plate 11a that constitutes the core body 11.

[0054] By moving the core part 10 upward with the push-up part 41 until the upper end of the post part 22 of the jig 20 is lower than the lower end of the core part 10, the core part 10 becomes separated from the jig 20 and can be moved in any direction relative to the jig 20.

[0055] Once the core part 10 separated from the jig 20 is held by the core part support part 42 (see FIG. 5), the push-up part 41 is moved downward to separate it from the core part 10 and returned to its original position where the upper end of the push-up part 41 is below the jig 20. The core part 10, while still held by the core part support part 42, is moved by the core part support part 42 and removed from between the upper and lower molds. Furthermore, after the push-up part 41 is returned to its original position, the jig 20 is left held by the jig holding part 43, and is made movable relative to the lower mold. The jig 20 is then moved by the jig holding part 43 and removed from between the upper and lower molds. The core part 10 and the jig 20 removed from between the upper and lower molds are then transferred to the next process by a predetermined transfer mechanism.

[0056] In this way, in the core part manufacturing method according to the present embodiment, the core part 10 is obtained through a filling step in which resin is filled into the space in the core body 11 supported by the jig 20, and then in the separation step, the jig 20 is separated from the core part 10. In this step, the push-up part 41 of the separation mechanism 40, which contacts the core part 10 through the base part 21 of the jig 20, is brought into contact with at least the contacted part 15 located on the imaginary line L passing through the center C of the axial hole 11c and the convex part 11d of the inner periphery of the core part 10, so that when the core part 10 moves relative to the jig 20, Since the core body 11 is efficiently supported by the push-up portion 41, which is in contact with the point directly opposite the protrusion 11d (contacted portion 15) near the protrusion 11d, even if the protrusion 11d of the core body 11 is subjected to frictional resistance between the post portion 22, stress due to an imbalance in the force applied to the core body 11 is less likely to occur in various parts of the core body 11, thereby suppressing adverse effects on the thin plate 11a that constitutes the core body 11, such as deformation, and allowing the core body 10 to be separated from the jig 20 without any problems and sent to the next process, thereby ensuring stable production of the core body 10.

[0057] In the core manufacturing method according to this embodiment, the relationship between the overlapping thin plates 11a that make up the core body 11 is not specifically indicated, but each thin plate 11a that makes up the core body 11 can be connected by crimping at one or more locations on at least one of the inner periphery facing the axial hole 11c of the core body 11 and the surrounding area of ​​this inner periphery, and the obtained core body 11 can be supported by a jig 20 and supplied to the filling process. In this case, even if a force due to frictional resistance is applied to the convex portion 11d, which is a non-circumferential portion, during the separation process, the thin plates 11a are firmly connected and integrated with each other, so that the strength to resist the force is increased, and it is possible to more reliably prevent deformation.

[0058] When connecting the thin plates 11a that make up the core body 11 in this way by crimping, the crimp position and the contact position of the push-up portion 41 may be made to overlap, and by applying force from the push-up portion 41 to the area that has been strengthened by the crimping, even if the force from the push-up portion 41 is somewhat large, deformation such as indentations can be prevented from occurring on the core body 11 side. Alternatively, the thin plates 11a constituting the core body 11 may be connected to each other by welding, adhesive, or the like.

[0059] Furthermore, in the core part manufacturing method according to this embodiment, the core part 10 and the jig 20 are present between the upper and lower molds of the core part manufacturing apparatus 1, and the separation of the core part 10 and the jig 20 is carried out by the separation mechanism 40 as a separation process. However, this is not limited to this, and the core part 10 and the jig 20 can also be separated by transporting the core part 10 and the jig 20 out from between the upper and lower molds, and then holding the jig 20 with a predetermined holding means, and moving the core part 10 upward with a push-up part of the separation mechanism that is separate from the core part manufacturing apparatus 1.

[0060] Furthermore, in the core part manufacturing method according to this embodiment, in the filling process, the upper mold 31 having the accommodation hole 31a containing the molten resin 81 is directly abutted against the core body 11, and the molten resin 81 is extruded from the upper mold 31, and the molten resin 81 is injected and filled into the magnet insertion hole 11b of the core body 11. However, this is not limited to this, and a plate-shaped cull plate having recesses or through holes that serve as resin flow paths that can communicate with the magnet insertion hole 11b of the core body 11 can also be attached to the upper side of the core body 11, and the molten resin 81 extruded from the accommodation hole 31a can be injected and filled into the magnet insertion hole 11b of the core body 11 through this cull plate. In this case, after the molten resin 81 has solidified, the solidified resin remaining on the top of the core body can be removed by removing the cull plate, making it easier to remove unnecessary resin.

[0061] Furthermore, in the core manufacturing method according to this embodiment, in the filling process, the resin material contained and held in each of the accommodation holes 31a of the upper mold 31 is heated and melted to obtain molten resin 81, which is then injected into the magnet insertion holes 11b into which the permanent magnets 12 have already been inserted, filling the holes, and solidifying the molten resin 81. However, this is not limited to this, and it is also possible to feed unmelted tablet-like, granular, powder-like resin material into the magnet insertion holes 11b, which serve as the space portions of the core body 11, before inserting the permanent magnets 12, and then insert the permanent magnets 12 while melting the resin material, and after the molten resin is appropriately positioned in each portion of the magnet insertion holes 11b, to solidify the resin.

[0062] (Second embodiment of the present invention) In the core part manufacturing method according to the first embodiment, in the separation process, the push-up portion 41 is moved upward relative to the jig 20 to protrude from the hole in the base portion 21 of the jig 20, and the core part 10 is moved upward, thereby separating the core part 10 and the jig 20. However, this is not limited to this, and as a second embodiment, as shown in Figures 7 and 8, the push-up portion 41 and the core part 10 can be left unchanged, and the lower mold 32 and the jig 20 can be moved downward, thereby separating the core part 10 and the jig 20.

[0063] In this case, the push-up portion 41 of the separation mechanism 40 is caused to protrude relative to the base portion 21 of the jig 20, and is brought into contact with a plurality of locations on the end face of the core body 11 of the core portion 10 supported by the jig 20, including the contacted portion 15 located on the imaginary line L passing through the center of the axial hole 11c and the convex portion 11d on the inner periphery, while the jig 20 is moved downward, causing the core portion 10 to move relative to the jig 20, and separating the core portion 10 from the jig 20. Specifically, the push-up portion 41 allows the jig 20 to move downward together with the lower mold 32 on which it is placed, while supporting the core portion 10 by contacting the end face of the core body 11 of the core portion 10, and does not move relative to the moving jig 20, thereby maintaining the position of the core portion 10, thereby protruding relative to the base portion 21 and causing the core portion 10 to move upward relative to the jig 20.

[0064] Furthermore, the core part support part 42 supports and moves the core part 10 after it is held in an immovable state by the push-up part 41 and separated from the jig 20, thereby enabling the core part 10 to be transported from between the upper and lower molds to the next process.

[0065] Furthermore, when the jig 20 is moved relative to the core portion 10 supported by the push-up portion 41, the jig holding portion 43 holds the jig 20 in conjunction with the movement of the lower mold 32 so that the jig 20 moves integrally with the lower mold 32 at least until the jig 20 separates from the core portion 10, and after the core portion 10 is separated, the jig 20 is moved while being supported so that it can be removed from between the upper and lower molds.

[0066] In the separation process of this embodiment, first, the jig 20 is held by the jig holding part 43, and the relative movement of the jig 20 in each direction with respect to the lower die 32 is restricted (see FIG. 7(a)). Then, while maintaining the position of the push-up part 41 of the separation mechanism 40, the lower die 32 and the jig holding part 43 are moved downward relative to the push-up part 41, until the push-up part 41 comes into contact with the end face of the core body 11 of the core part 10 supported by the jig 20 through the hole 21a of the base part 21 (see FIG. 7(b)).

[0067] In this state, while still maintaining the position of the push-up portion 41, the lower mold 32 and the jig holding portion 43 are moved downward relative to the push-up portion 41. At this time, the core portion 10 is supported by the push-up portion 41, which is in contact with it and does not move, and the downward movement of the core portion 10 is restricted, so that the base portion 21 of the jig 20, which moves together with the lower mold 32, moves away from the core portion 10, and the post portion 22 of the jig 20 comes out of the axial hole 11c of the core body 11 in the core portion 10 (see FIG. 8(a)).

[0068] In addition to the movement of the jig 20 being restricted by the jig holding portion 43, the push-up portion 41 contacts and supports an appropriate location on the end face of the core body 11, so that when the jig 20 is moved downward, no unnecessary movement other than relative movement in the vertical direction occurs between the jig 20 and the core portion 10, and the frictional resistance generated when the inner periphery, including the convex portion 11d of the core body 11, comes into contact with the post portion 22 of the jig 20 can be kept to a necessary minimum, allowing the jig 20 to be moved relative to the core portion 10 without any problems.

[0069] By moving the jig 20 downward until the upper end of the post portion 22 of the jig 20 is lower than the lower end of the core portion 10, the core portion 10 becomes separated from the jig 20, and the core portion 10 can be moved in any direction relative to the jig 20.

[0070] After the core part 10 separated from the jig 20 is held by the core part support part 42 (see FIG. 8(b)), the core part 10 is moved relative to the push-up part 41 by the core part support part 42, and the core part 10 is removed from between the upper and lower molds. After the core part 10 is removed, the lower mold 32 is raised together with the jig 20 and returned to its original position. Furthermore, while the jig 20 is still held by the jig holding part 43, the jig 20 is made movable relative to the lower mold 32, and the jig 20 is moved by the jig holding part 43 and removed from between the upper and lower molds. The core part 10 and the jig 20 removed from between the upper and lower molds are transferred to the next process by a predetermined transfer mechanism, similar to the first embodiment.

[0071] In the core part manufacturing method according to this embodiment, the core part 10 and the jig 20 are present between the upper and lower molds of the core part manufacturing device 1, and the separation of the core part 10 and the jig 20 is carried out by the separation mechanism 40 as a separation process. However, this is not limited to this. After the core part 10 and the jig 20 are transported out from between the upper and lower molds, the jig 20 is held by a predetermined holding means, and the push-up part of the separation mechanism, which is separate from the core part manufacturing device 1, is abutted against the core part 10 to support the core part 10, and the holding means is moved downward together with the jig 20 relative to the stationary push-up part, thereby separating the core part 10 and the jig 20.

[0072] Furthermore, in the core part manufacturing method according to the first embodiment, the push-up portion 41 is moved upward in the separation process, and the core part 10 is moved upward by pushing the push-up portion 41 against the stationary jig 20, thereby separating the core part 10 from the jig 20. In the core part manufacturing method according to the second embodiment, the push-up portion 41 and the core part 10 are not moved in the separation process, and the lower mold 32 and the jig 20 are moved downward to separate the core part 10 from the jig 20. In each separation process, when separating the core part 10 from the jig 20, only one of the jig 20 and the core part 10 is actually moved, so that a relative movement state occurs between the jig 20 and the core part 10, in which one moves away from the other. However, the present invention is not limited to these, and a method may be adopted in which, in the separation process, the push-up portion is moved upward, and the core portion is pushed by the push-up portion to move upward, while at the same time the jig is moved downward, i.e., the core portion and the jig are moved to separate them. In this case, by actually moving both the jig and the core portion in directions away from each other, the separation of the core portion and the jig progresses quickly, and the separation process can be completed in a shorter time.

[0073] Furthermore, in addition to moving both the jig and the core part in opposite directions during the separation process, the core part and the jig may be separated by moving both the jig and the core part upward while making the movement speed of the core part faster than that of the jig, or by moving both the jig and the core part downward while making the movement speed of the jig faster than that of the core part.

[0074] (Third embodiment of the present invention) In the core part manufacturing method of the first embodiment, in the filling process, resin is supplied to the accommodating hole 31a provided in the upper mold 31 of the core part manufacturing apparatus 1, and the heated and melted resin is extruded downward from the accommodating hole 31a by the extrusion section 33, and the resin is injected and filled from above into the magnet insertion hole 11b, which serves as the space section of the core body 11. However, this is not limited to this, and as a third embodiment, as shown in Figures 9 to 12, in the filling process, resin can also be injected and filled into the core body 11 from the lower mold 37 side of the core part manufacturing apparatus 2.

[0075] In this case, the upper mold 36 in the core manufacturing device 2 does not have anything equivalent to the accommodation holes 31a and extrusion portions 33 in the first embodiment. On the other hand, the lower mold 37 has a plurality of accommodation holes 37a that can accommodate and hold resin, and extrusion portions 38 that are arranged so as to be insertable into the accommodation holes 37a from below and can extrude the resin.

[0076] Furthermore, the jig 25 that supports the core body 11 has a base portion 26 and post portions 27, just like the first embodiment, but differs in that the base portion 26 is provided with a plurality of resin passages 26b that are holes that pass through it. The plurality of resin passages 26b of the base portion 26 are arranged to correspond to the respective accommodation holes 37a of the lower mold 37, and are through holes that lead to the respective accommodation holes 37a of the lower mold 37 and the respective magnet insertion holes 11b of the core body 11.

[0077] Then, in the filling process, resin is supplied to the accommodation hole 37a provided in the lower mold 37, and the heated and melted molten resin 81 is extruded upward from the accommodation hole 37a by the extrusion section 38, and the molten resin 81 is injected and filled from below into the magnet insertion hole 11b of the core body 11 through the resin passage 26b of the jig 25 (see Figure 9).

[0078] In the filling process, when the molten resin 81 filled into each magnet insertion hole 11b solidifies, the permanent magnets 12 are fixed, and the core portion 10 is obtained, the filling process is completed and the extrusion portion 38 is pulled down to return to its original state, and the upper mold 36 is raised or the lower mold 37 is lowered, thereby ending the clamping and pressing of the core body 11 by the upper mold 36 and the lower mold 37 (see Figure 10).

[0079] Then, the process moves to the separation step, in which the jig 25 on the lower mold 37 is held by the jig holding part 43, and movement of the jig 25 in all directions, including upward, is restricted (see FIG. 11(a)). Then, the push-up part 41 of the separation mechanism 40 is moved upward with respect to the core part 10 supported by the jig 25, so that the push-up part 41 passes through the hole 26a of the base part 26 and comes into contact with the end face of the core body 11 of the core part 10 placed on this base part 26 (see FIG. 11(b)).

[0080] From this state, the push-up portion 41 is further moved upward to push up the core portion 10, and the core portion 10 is moved upward relative to the jig 25. As a result, the end face of the core body 11 in the core portion 10 moves away from the base portion 26 of the jig 25, and the post portion 27 of the jig 25 comes out of the axial hole 11c of the core body 11 (see FIG. 12(a)).

[0081] By having the push-up portion 41 come into contact with and press an appropriate location on the end face of the core body 11, when the core portion 10 is moved relative to the jig 25, as in the first embodiment, the frictional resistance generated when the inner peripheral portion, including the convex portion 11d of the core body 11, comes into contact with the post portion 27 of the jig 25 can be kept to a necessary minimum, and the stress in each portion of the core body 11 does not become excessive, preventing deformation of the thin plate 11a that constitutes the core body 11.

[0082] The core portion 10 is separated from the jig 25 by moving the core portion 10 upward until the upper ends of the post portions 27 of the jig 25 are lower than the lower end of the core portion 10. As in the first embodiment, the core portion 10 thus separated from the jig 25 is then held by the core portion support portions 42 (see FIG. 12(b)), and then moved by these core portion support portions 42 and removed from between the upper and lower molds. The jig 25 also has its push-up portions 41 moved downward to return to its original position, and then, while still held by the jig holding portions 43, is moved by these jig holding portions 43 and removed from between the upper and lower molds.

[0083] (Other embodiments of the present invention) In the core part manufacturing method according to the first embodiment, the arrangement and shape of the contacted parts 15 on the imaginary line L passing through the protrusions 11d as non-circumferential parts of the core body 11 and the center C of the axial hole 11c, i.e., the arrangement and shape of the contact surfaces 41a of the push-up parts 41 that come into contact with the core body 11, are symmetrical about the imaginary line L. However, this is not limited to this, and as long as part of the contact surface of the push-up part is on the imaginary line L, at least one of the arrangement and shape of the contact surface (contacted parts 15) may be asymmetrical (see FIG. 13(a)). In this case, the shapes of the parts of the jig 20 are set in accordance with the shapes and arrangement of the core body 11 and the push-up parts that come into contact with and support it (see FIG. 13(b)). In particular, when part of the contact surface of the push-up portion is on the imaginary line L and the arrangement of the contact surface (contacted portion 15) is asymmetrical around the imaginary line L, a common jig (base portion) can be used for one core body 11 (e.g., Figure 2(b)) having a magnet insertion hole 11b in one arrangement relative to the convex portion 11d, and another core body 11 (e.g., Figure 13(a)) having a magnet insertion hole 11b in another arrangement relative to the convex portion 11d.

[0084] Furthermore, in the first embodiment, the arrangement of the push-up portions 41 in the separation mechanism 40 in the core part manufacturing apparatus 1 is made symmetrical about the center C of the axial hole 11c of the iron core body 11 supported by them, but an asymmetric arrangement is also acceptable as long as the end face of the iron core body 11 can be supported in a balanced manner by the push-up portions 41.

[0085] In the core part manufacturing method according to the first embodiment, two convex portions 11d are provided as non-circumferential portions in the core body 11, arranged opposite each other across the center C of the axial hole 11c, but this is not limitative, and it is also possible to provide only one non-circumferential portion, or three or more non-circumferential portions.The non-circumferential portion is not limited to a convex portion, and may be, for example, a concave portion.One or more concave portions may be provided in cases where an anti-rotation key is inserted between the rotating shaft and the core body, or where the rotating shaft is a splined shaft or a serrated shaft.

[0086] Furthermore, even when the non-circumferential portion is a convex portion, as long as it is convex toward the inside of the circumference, it may have a convex shape without corners, for example, a shape in which the convex portion protrudes from the circumference to the position of a chord that is a straight line connecting two points on the circle so as to obtain a substantially D-shaped shaft hole for fixing a rotating shaft having a substantially D-shaped cross section with a portion of the shaft made flat.In addition, it may have a shape in which multiple convex portions protrude from the circumference to the positions of each side of a polygon so as to obtain a polygonal hole for fixing a rotating shaft having a polygonal cross section. [Explanation of symbols]

[0087] 1, 2 Core manufacturing equipment 10 Core 11 Core body 11a thin plate 11b Magnet insertion hole 11c shaft hole 11d Convex part 12 Permanent magnets 13 Filling material 15 Contacted part 20, 25 Jig 21, 26 Base 21a, 26a holes 22, 27 Post Section 22a Recess 26b Resin passage 31, 36 upper mold 31a Receiving hole 32, 37 Lower mold 33, 38 Extrusion section 37a Receiving hole 40 Separation mechanism 41 Push-up part 41a Contact surface 42 Core support 43 Jig holding part 81 Molten Resin

Claims

1. A core manufacturing method for manufacturing a core that forms a part of a rotor or stator of a rotating electric machine, comprising: filling a plurality of spaces in a core body formed by stacking a plurality of thin plates made of a magnetic metal material with resin while the core body is supported by a jig; a filling step of filling a resin into the space of the core body; a separation step of separating the core portion and the jig obtained through the filling step by a predetermined separation mechanism, the jig has a base portion on which the core body can be placed and a post portion protruding from the base portion in a substantially columnar shape, and the base portion is provided with a plurality of through holes passing therethrough; The core body has an axial hole at the center that penetrates in the lamination direction of the thin plates, and an inner circumferential portion facing the axial hole has one or more non-circumferential portions that serve as a rotation stop for the shaft inserted into the axial hole, and in the filling step, a post portion of the jig is inserted into the axial hole and supported, the separation mechanism has at least a push-up portion that can be inserted into and removed from a base portion of the jig through the through hole, In the separation step, a push-up portion of the separation mechanism protrudes relative to a base portion of the jig and contacts a plurality of locations of the core body of the core portion, including a contacted portion located on an imaginary line passing through the center of the axial hole and the non-circumferential portion, and moves one or both of the jig and the core portion relatively to separate the core portion from the jig, The contact surface of the core portion with the core body in the push-up portion is arranged at a position that does not overlap with a region of the end face of the core body that corresponds to the space portion. A core part manufacturing method characterized by the above.

2. 2. The core portion manufacturing method according to claim 1, In the separation step, the plurality of locations on the core body of the core portion with which the push-up portion of the separation mechanism comes into contact are set to be a plurality of locations on the end surface of the core body that are symmetrical with respect to the center of the axial hole. A core part manufacturing method characterized by the above.

3. 3. The core part manufacturing method according to claim 1, In the push-up portion of the separation mechanism, among the contact surfaces of the core portion with the end surface of the iron core body, the contact surface that contacts the contacted portion is shaped to be symmetrical or asymmetrical with respect to the virtual straight line. A core part manufacturing method characterized by the above.

4. 4. The core manufacturing method according to claim 1, The core body is supported by the jig and subjected to the filling step in a state in which the thin plates constituting the core body are connected by crimping at one or more locations on at least one of the inner periphery facing the axial hole and the periphery of the inner periphery, The contact position of the thrust-up portion with the core body is made to overlap the position of the crimp. A core part manufacturing method characterized by the above.

5. In the core part manufacturing method according to claim 1 or 2, The shape of each contact surface of the push-up portion of the separation mechanism with the end surface of the core body of the core portion is an ellipse having an arc portion and a parallel straight portion. A core part manufacturing method characterized by the above.

6. In the core part manufacturing method described in claim 5, The direction of the parallel straight line portion is set to be perpendicular to the virtual straight line. A core part manufacturing method characterized by the above.

7. A core part manufacturing device that manufactures a core part that forms part of a rotor or stator of a rotating electric machine by filling a plurality of spaces in an iron core body formed by stacking a plurality of thin plates made of a magnetic metal material with resin while the iron core body is supported by a jig, a separation mechanism that separates the jig from the core portion obtained by filling the core body supported by the jig with resin; the jig has a base portion on which the core body can be placed and a post portion protruding from the base portion in a substantially columnar shape, and the base portion is provided with a plurality of through holes passing therethrough; The core body has an axial hole at the center that penetrates in the lamination direction of the thin plates, and an inner circumferential portion facing the axial hole has one or more non-circumferential portions that act as a rotation stopper for a shaft inserted into the axial hole, and when supported by the jig, the post portion is inserted into the axial hole, the separation mechanism has at least a push-up portion that can be inserted into and removed from a base portion of the jig through the through hole, The push-up portion protrudes relative to the base portion of the jig and contacts a plurality of locations of the core body of the core portion, including a contacted portion located on an imaginary line passing through the center of the axial hole and the non-circumferential portion, and moves one or both of the jig and the core portion relatively to separate the core portion and the jig, The contact surface of the core portion with the core body in the push-up portion is arranged at a position that does not overlap with a region of the end face of the core body that corresponds to the space portion. This is a core manufacturing device.

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