Apparatus and method for manufacturing a magnet-embedded core

Abstract

In manufacturing a magnet-embedded core, generation of burrs and problems associated with the burrs are prevented. An apparatus for manufacturing a magnet-embedded core includes a base (32) including an upper surface at which a resin pot chamber (64) for storing molten resin is opened, a partition (36) detachably placed onto the upper surface of the base (32) to support a rotor core (2) thereon, and having a gate (50) and a knock-out opening (52) that communicate a magnet insertion hole (4) of the rotor core (2) with the resin pot chamber (64), and a plunger (62) movably provided in the resin pot chamber (64) to press the molten resin in the resin pot chamber (64) into the magnet insertion hole (4) via the gate (50) and the knock-out opening (52), wherein an annular recess (66) is formed on the upper surface of the base (32) so as to extend out of the resin pot chamber (64) and communicate with the resin pot chamber (64).

Description

Technical Field

[0001] This invention relates to an apparatus and method for manufacturing magnet embedded cores, and more particularly to an apparatus and method for manufacturing magnet embedded cores for use in rotating electrical machinery. Background Technology

[0002] Various techniques have been developed to manufacture magnet inserts for rotating electromechanical machinery by inserting a magnet into each of a plurality of magnet insertion holes axially defined in a rotor core, loading a liquid resin material into the magnet insertion holes, and curing the loaded resin material to fix the magnet in the rotor core.

[0003] Known manufacturing apparatus for such magnet insert cores includes: a base having resin tanks for storing molten resin inside, each resin tank having an opening on an upper surface of the base; a partition detachably placed on the upper surface of the base to support the rotor core and having a communication channel connecting the resin tanks to corresponding magnet insertion holes; and a plurality of plungers movably received in corresponding resin tanks to expel molten resin from the resin tanks into corresponding magnet insertion holes via corresponding communication channels.

[0004] Patent Document 1: WO2017 / 179547A Summary of the Invention

[0005] The task to be achieved by this invention

[0006] According to the aforementioned manufacturing apparatus for magnet inserts, during the steps of extruding molten resin from each resin tank chamber into the corresponding magnet insertion hole using a corresponding plunger, and the subsequent pressure maintenance step, the molten resin may transfer from the resin tank chamber to the gap between the upper surface of the base and the lower surface of the partition, where it solidifies and produces a thin flash. The flash deposited on the base can cause surface defects in the molten resin or resin leakage. Furthermore, the flash tends to break easily and become mixed with the molten resin loaded into the magnet insertion hole. Therefore, the resin cannot be properly loaded into the magnet insertion hole.

[0007] The present invention was made in view of this problem in the prior art, and its main purpose is to prevent the generation of burrs and to prevent problems associated with the generation of burrs.

[0008] means to achieve the task

[0009] An apparatus for manufacturing a magnet insert core according to an embodiment of the present invention is an apparatus for manufacturing a magnet insert core, the magnet insert core comprising: a rotor core having a magnet insertion hole forming a through hole opening outward at two axial end faces of the rotor core; a magnet positioned in the magnet insertion hole; and resin filling the magnet insertion hole. The apparatus for manufacturing a magnet insert core further comprises: a base having a surface at which a resin tank chamber for storing molten resin is opened; a partition removably placed on a surface of the base, the rotor core being placed on the partition, the partition having a communicating channel connecting the magnet insertion hole to the resin tank chamber; and a plunger movably disposed in the resin tank chamber to expel molten resin from the resin tank chamber into the magnet insertion hole via the communicating channel; wherein an annular recess is provided at the boundary between the base and the partition, the recess extending outward to the resin tank chamber and communicating with the resin tank chamber.

[0010] This design prevents the formation of burrs, thus avoiding any malfunctions caused by burrs.

[0011] In the aforementioned apparatus for manufacturing a magnet embedded core, preferably, the thickness of the recess in the direction of movement of the plunger is from 0.1 mm to 0.3 mm.

[0012] This design minimizes resin waste.

[0013] In the aforementioned apparatus for manufacturing magnet embedded cores, preferably, the base includes: a base body having a can retaining hole extending outward on an outer surface on one side of the base body; and a can member fitted into the can retaining hole. The resin can chamber is defined by the can member, and the end face of the can member on one side of the base is farther from the partition plate than the outer surface of the base body. The recess is defined by the end face of the can member, the inner circumferential surface of the can retaining hole, and the surface of the partition plate on one side of the base.

[0014] Based on this structure, the recess can be accurately formed simply by selecting the axial length of the tank component.

[0015] In the aforementioned apparatus for manufacturing magnet embedded cores, preferably, the recess is defined by a cut in the surface of the partition located on one side of the base and the base.

[0016] Based on this structure, the recess can be formed in a precise manner by manipulating the partition.

[0017] Another aspect of the invention provides a method for manufacturing a magnet insert core using an apparatus for manufacturing a magnet insert core according to the foregoing embodiments, the magnet insert core comprising: a rotor core having a magnet insertion hole forming a through hole opening externally at two end faces of the rotor core; a magnet positioned in the magnet insertion hole; and resin filling the magnet insertion hole, the method comprising an extrusion feeding step of extruding molten resin in a resin tank chamber into the magnet insertion hole using a plunger, wherein, in the extrusion feeding step, molten resin advancing into a recess and stopping its flow in the recess solidifies faster than molten resin flowing in other locations.

[0018] According to this method, the formation of burrs is prevented, thus avoiding any defects caused by burrs.

[0019] Effects of the present invention

[0020] The apparatus and method for manufacturing magnet embedded cores according to the present invention prevent the generation of burrs, thereby avoiding any faults caused by burrs. Attached Figure Description

[0021] Figure 1 This is a perspective view of an example of a magnet embedded core manufactured by a manufacturing method and manufacturing apparatus according to an embodiment of the present invention;

[0022] Figure 2 This is a vertical cross-sectional view of the magnet embedded core;

[0023] Figure 3 This is a vertical cross-sectional view of a manufacturing apparatus for a magnet embedded core according to an embodiment of the present invention, in its initial state.

[0024] Figure 4 This is an enlarged vertical cross-sectional view of the main part of a manufacturing apparatus for a magnet embedded core according to an embodiment of the present invention;

[0025] Figure 5 This is a vertical cross-sectional view of a manufacturing apparatus for a magnet embedded core according to an embodiment of the present invention, showing solid resin and a magnet inserted into a magnet insertion hole;

[0026] Figure 6 This is a vertical cross-sectional view of a manufacturing apparatus for a magnet embedded core according to an embodiment of the present invention, wherein the magnet insertion hole is closed.

[0027] Figure 7 This is a vertical cross-sectional view of a manufacturing apparatus for a magnet insert core according to an embodiment of the present invention, showing resin being extruded into and held there in a magnet insertion hole.

[0028] Figure 8 This is a vertical cross-sectional view of a magnet insert core manufactured by a manufacturing apparatus for magnet insert cores according to an embodiment of the present invention and removed from a forming apparatus; and

[0029] Figure 9 This is an enlarged vertical cross-sectional view of the main part of a manufacturing apparatus for a magnet embedded core according to another embodiment of the present invention. Detailed Implementation

[0030] Preferred embodiments of the present invention are described below with reference to the accompanying drawings.

[0031] First, refer to the following text. Figure 1 and Figure 2 An example is described of a magnet embedded core manufactured by a manufacturing apparatus and manufacturing method according to an embodiment of the present invention.

[0032] The magnet-embedded core 1 is a component of rotating machinery such as an electric motor, and includes a rotor core 2. The rotor core 2 is a laminated iron core formed by laminating multiple electromagnetic steel plates and joining the electromagnetic steel plates together using known joining methods (such as crimping, laser welding, bonding, etc.). The rotor core 2 is generally annular in shape in plan view and has a shaft hole 3 at its center.

[0033] The rotor core 2 has a plurality of magnet insertion holes 4, each defining a generally rectangular space. Each magnet insertion hole 4 extends axially through the rotor core 2 and opens outward at both end faces of the rotor core 2. In the illustrated embodiment, although the magnet insertion holes 4 are formed in four positions arranged circumferentially at regular intervals, the magnet insertion holes 4 are not limited to this embodiment and can be arranged in any other different manner with respect to shape, number, and arrangement.

[0034] A generally cuboid-shaped magnet 5 is received in each magnet insertion hole 4. Each magnet 5 may be made of, for example, a sintered magnet based on ferrite or a permanent magnet (magnetized or unmagnetized) (such as neodymium magnet). The size of each magnet 5 is slightly smaller than the corresponding size of the magnet insertion hole 4. Therefore, a gap is created between the rotor core 2 and each magnet 5, and this gap is filled with resin 6 that fixes the magnet 5 to the rotor core 2. The resin 6 may be made of a thermosetting resin such as epoxy resin.

[0035] like Figure 1As shown, the magnets 5 in each magnet insertion hole 4 are offset inward (or offset towards the center of the rotor core 2), such that the outer surface 5A of the magnet 5 facing the center of the rotor core 2 is in contact (closely abutting) with the corresponding inner surface 4A of the corresponding magnet insertion hole 4. Thus, the magnets 5 are uniformly positioned radially relative to the rotor core 2, and the magnet insertion holes 4 are uniformly positioned circumferentially relative to the rotor core 2, preventing the magnets 5 from becoming arbitrarily unbalanced in rotation. The magnets 5 can also be positioned along... Figure 1 The radial offset shown is in the opposite direction (or the offset away from the center of rotor core 2).

[0036] Now refer to the following text Figures 3 to 7 A manufacturing apparatus 10 for the magnet embedded core 1 of the illustrated embodiment is described.

[0037] The manufacturing apparatus 10 is provided with an extrusion structure, which includes a plurality of vertically extending tie rods 12, a plate-shaped fixed pressure plate 16 fixed to the upper part of the tie rods 12, and a plate-shaped movable pressure plate 14 vertically and movably supported by the tie rods 12 below the fixed pressure plate 16. The movable pressure plate 14 can be vertically driven by a mold clamping device (not shown in the figures), which can be based on a known toggle mechanism or feed screw mechanism.

[0038] The upper member 18 is fixed to the lower surface of the fixed pressure plate 16. The closing members 20 for each magnet insertion hole 4 are fixed to the upper member 18 by rods 19 protruding downwards from the lower surface of the upper member 18, and the core pressing member 24 is suspended from the upper member 18 by springs 22. The closing members 20 are configured to close each magnet insertion hole 4, and each is formed in a generally rectangular shape in plan view, which is larger than the plan view shape of the corresponding magnet insertion hole 4. Through holes 26 receiving each closing member 20 in the vertical direction are formed in the core pressing member 24. The closing members 20 may each be formed in a generally rectangular shape in plan view, which is larger than the plan view shape of the corresponding magnet insertion hole 4. Alternatively, the closing members 20 may have a plan view shape that covers two or more of the adjacent magnet insertion holes 4 to simplify the structure of the manufacturing apparatus 10.

[0039] The lower component 30 is fixed to the movable pressure plate 14. The base 32 is mounted to the lower component 30. The partition 36 of the rotor core retainer 34 is placed on the upper surface of the base 32 (the upper surface 56A of the base body 56, which will be described below) in a removable and replaceable manner.

[0040] The rotor core retainer 34 includes a partition 36 that acts as a tray for placing the rotor core 2 on top, and a plate-like upper plate 38 placed above the partition 36. The partition 36 and the upper plate 38 are connected to each other by engaging movable engaging claws 40 provided on the partition 36 with fixed engaging claws 40 attached to the upper plate 38, and detachably retain the rotor core 2 therebetween in a vertical direction. The rotor core retainer 34 is transportable so that the rotor core 2 can be placed on and removed from the base 32 while inserted between the partition 36 and the upper plate 38.

[0041] The upper plate 38 is formed with insertion holes 44 that extend vertically through the upper plate 38 to allow the closing member 20 to move into the insertion holes 44 at positions aligned with the respective magnet insertion holes 4 of the rotor core 2. The insertion holes 44 may have the same dimensions as the through holes 26 formed in the core pressing member 24. The insertion holes 44 and the closing member 20 may move along with the protrusions 25 formed on the outer periphery of the through holes 26 during the upward stroke of the movable pressure plate 4 (see [link to related document]). Figure 3 ) respectively fitted into the recesses 45 formed on the outer periphery of the insertion hole 44 (see Figure 3 And aligned precisely with each other.

[0042] like Figure 4 As shown, the partition 36 is formed by placing a gate 46 and a rejection plate 48, each composed of a flat plate, on top of each other, and the gate 46 and rejection plate 48 can be detachably joined to each other using bolts (not shown in the figures). The gate 46 has an upper surface 46A abutting the lower end face 2A of the rotor core 2 and a plurality of gates 50 individually communicating with the lower openings 4B of each magnet insertion hole 4. The rejection plate 48 is located below the gate 46 and includes a plurality of rejection openings 52 having a circular cross-section and communicating with each gate 50 and each resin tank chamber 64, which will be described below. Thus, each gate 50 and the corresponding rejection opening 52 form a communication channel that connects the corresponding magnet insertion hole 4 and the corresponding resin tank chamber 64 to each other.

[0043] The base 32 includes: a base body 56 having a flat upper surface (outer surface) 56A and can holding holes 54 configured to correspond to each magnet insertion hole 4, each having a circular cross-section and an open upper end; and cylindrical can members 58 received in each can holding hole 54. Each can member 58 has a flange 60 at its lower end, and the flange 60 clamps between the base body 56 and the lower member 30, thereby securing the can member 58 to them. Each can member 58 has a free end at its upper end to avoid stress caused by thermal expansion.

[0044] Each tank component 58 receives the plunger 62 in a vertically movable manner (along the axial direction of the tank component 58). The tank component 58 defines a resin tank chamber 64 above the plunger 62 (see [link]). Figure 6 The resin tank chamber 64 is a space with a circular cross-section coaxial with the rejection opening 52, and opens at the upper surface 56A of the base 32. The inner diameter of the resin tank chamber 64 is smaller than the inner diameter of the rejection opening 52, and smaller than the inner diameter of the tank holding hole 54 than the thickness of the tank member 58.

[0045] The upper end face 58A of the can member 58 is located lower than the upper surface 56A of the base body 56, or in other words, on the side farther away from the partition 36 compared to the upper surface 56A of the base body 56. Therefore, an annular recess 66 is defined by the upper end face 58A of the can member 58, the inner circumferential surface 54A of the can retaining hole 54, and the lower surface 48A of the ejector plate 48 (the surface of the partition 36 on the base 32 side). The recess 66 extends radially outward from the resin can chamber 64 at the boundary between the base 32 and the partition 36, and can be considered to form a groove shape that faces radially inward and surrounds the resin can chamber 64, and communicates directly with the resin can chamber 64. The thickness (width) of the recess 66, as measured along the direction of movement of the plunger 62, can be from 0.1 mm to 0.3 mm to achieve the effective sealing effect discussed below, but the thickness is shown in the figures with some exaggeration. In this embodiment, the thickness of the recess 66 can be accurately achieved by appropriately selecting the axial length of the can component 58.

[0046] Cylinder bores 70 are formed in the lower member 30 to correspond to corresponding plungers 62. Each cylinder bore 70 receives a piston 72 in a vertically movable (axial) manner. A piston rod 74 extends upward from each piston 72 and protrudes into the corresponding canister member 58 via a through-hole 76 formed in the lower member 30. The piston rod 74 is integrally connected to the plunger 62 by a screw 63 (see [link]). Figure 4 ).

[0047] The lower member 30 defines a cylinder chamber below each piston 72, serving as a compression chamber. Each cylinder chamber 78 is individually configured for each plunger 62 or for each resin tank chamber 64, allowing hydraulic oil to be supplied from the hydraulic generating device 84 to the cylinder chamber 78 via a manifold passage 80 formed in the lower member 30 and an external conduit 82. Each piston 72 moves upward as hydraulic oil is supplied from the hydraulic generating device 84 to its corresponding cylinder chamber 78, and pushes (compresses) the corresponding plunger 62 upward via its corresponding piston rod 74.

[0048] An electric heater 86 for heating the molten resin 8 in the resin tank chamber 64 is embedded in the lower component 30.

[0049] Now refer to the following text Figures 3 to 8Various steps of the manufacturing method for a magnet embedded core 1 according to the illustrated embodiment using the manufacturing apparatus 10 are described.

[0050] First, such as Figure 3 As shown, with the movable pressure plate 14 in the lowered state, the rotor core retainer 34, which clamps the rotor core 2 between the partition plate 36 and the upper plate 38, is placed on the base 32, so that the magnet insertion hole 4 is aligned with and communicates with each gate 50. In this assembly, the rotor core 2, together with the rotor core retainer 34, can be preheated.

[0051] In the subsequent resin / magnet loading step, solid resin 7 is loaded into the upper opening of each magnet insertion hole 4, and magnet 5 is loaded into the magnet insertion hole 4. Solid resin 7 can be prepared by forming uncured powder of the material resin (in the case of thermosetting resin, before a chemical reaction is initiated by heating) or particulate material resin with a small diameter, along with fillers (which may include additives, etc.), into columnar or any other desired shape using a granulator (not shown in the figures), or by forming uncured powder of the material resin into larger particles.

[0052] Then, the movable pressure plate 14 moves upward, which causes the lower component 30 to move upward until the upper plate 38 is as follows. Figure 5 Up to the adjacent core extrusion member 24 shown. As the lower member 30 moves further upward, as... Figure 6 As shown, each sealing member 20 moves into its corresponding insertion hole 44, while simultaneously compressing the spring 22, causing the sealing member 20 to push the corresponding magnet 5 into the magnet insertion hole 4. The upper surface of the rotor core 2 then abuts against the lower surface of the sealing member 20, so that the upper opening of the magnet insertion hole 4 is closed by the sealing member 20. This completes the sealing step.

[0053] At this time, the solid resin 7 in each magnet insertion hole 4 becomes molten resin 8 due to the heat from the preheated rotor core 2 and the heat supplied from the electric heater 86, and a portion of the molten resin 8 flows through the gate 50 and the rejection opening 52 and pushes down the plunger 62, piston rod 74 and piston 72 into the corresponding resin tank chamber 64 and the corresponding recess 66.

[0054] Subsequently, as Figure 7 As shown, during the extrusion feeding process, hydraulic pressure is supplied from the hydraulic generating device 84 to each cylinder chamber 78, causing the piston 72 to move upward, resulting in the plunger 62 extruding the molten resin 8 in the resin tank chamber 64, and feeding the molten resin 8 into the magnet insertion hole 4 via the gate 50 and the rejection opening 52.

[0055] During the extrusion feeding process, stagnation zones are created in each recess 66. In these zones, the flowability of the molten resin 8 decreases, causing the portion of molten resin 8 that has already flowed into (advanced into) the recess 66 to solidify faster than the portion that flows through the gate 50 and rejection opening 52 on its way to the magnet insertion hole 4. Furthermore, the volume of the portion of molten resin 8 in the recess 66 is significantly smaller than the volume of the portion in the rejection opening 52 and other locations, and the portion of molten resin 8 in the recess 66 has a larger surface area in contact with the wall of a given volume of recess 92. This also results in the portion of molten resin 8 in the recess 66 solidifying at a faster rate.

[0056] The cured portions of the resin in each recess 66 provide a sealing effect, preventing the molten resin 8 from entering any gaps that may exist between the lower surface 48A of the rejection plate 48 and the upper surface 56A of the base body 56. This effect is also achieved in a pressure maintenance step performed after the extrusion feeding process to maintain pressure on the molten resin 8.

[0057] This avoids burrs caused by the curing of molten resin 8 in the gap between the lower surface 48A of the rejection plate 48 and the upper surface 56A of the base body 56, thus preventing surface defects and resin leakage that may be caused by burr deposition on the base 32. Furthermore, it prevents burr fragments from mixing with the molten resin and prevents any malfunctions in properly filling the magnet insertion hole 4 with molten resin.

[0058] After a predetermined pressurization period, the hydraulic supply to cylinder chamber 78 is terminated, and then the movable pressure plate 14 is lowered, allowing the removal step of removing the rotor core retainer 34 from the base 32 to be performed. The removed rotor core retainer 34 is in a position as follows: Figure 8 The following state is shown: cured resin is deposited in the gate 50 and the rejection opening 52, and the thick burrs 9 of the portion of the resin cured in each rejection opening 52 are attached to the portion of the resin that has been cured in the corresponding recess 66 and removed therefrom.

[0059] Unlike conventional burrs, thick burrs 9 do not tend to break easily and have sufficient thickness to retain the portion of the resin that has cured in the corresponding rejection opening 52. This thickness is determined by the thickness of the recess 66, as measured along the direction of movement of the plunger 62, and can be approximately 0.1 mm to 0.3 mm. When the thickness of thick burrs 9 is less than 0.1 mm, the aforementioned characteristics of thick burrs 9 decrease, and when the thickness of thick burrs 9 is greater than 0.3 mm, resin waste increases.

[0060] After the molten resin 8 has cured, as a removal step, the connection between the partition 36 and the upper plate 38, maintained by the movable engaging claw 40 and the fixed engaging claw 42, is released, and the rotor core 2 is removed from the rotor core holder 34. During this removal step, the resin cured in the gate 50 and the rejection opening 52, along with the thick burrs 9, is separated from the resin 6 in the magnet insertion hole 4 at the gate 50. Subsequently, the resin cured in the gate 50 and the rejection opening 52, along with the thick burrs 9, is removed from the rotor core holder 34, allowing the rotor core holder 34 to be reused.

[0061] Now refer to the following text Figure 9 An apparatus for manufacturing a magnet embedded core according to another embodiment of the present invention is described. Figure 9 In, with Figure 4 The parts shown are indicated by the same reference numerals, and the description of these parts may be omitted in the following description.

[0062] In this embodiment, on the lower surface 48A of the rejection plate 48 or on the surface of the rejection plate 48 facing the base 32, the portion of the rejection plate 48 surrounding each rejection opening 52 expands radially outward to define a cut 90, and this cut 90, in conjunction with the can member 58, forms a recess 92. The recess 92 is functionally similar to the recess 66 of the previous embodiment, and extends radially outward from the resin can chamber 64. It can be considered to form a groove shape that faces radially inward to surround the resin can chamber 64, and is in direct communication with the resin can chamber 64. The thickness of the recess 92, as measured along the direction of movement of the plunger 62, can be from 0.1 mm to 0.3 mm to achieve an effective sealing effect similar to that of the previous embodiment, but the thickness is again shown in some exaggeration in the drawings.

[0063] Similarly, in this embodiment, the portion of molten resin 8 that has flowed into (advanced to) the recess 92 and stopped solidifies faster than the portion of molten resin 8 that flows past the gate 50 and the rejection opening 52 on its way to the magnet insertion hole 4. Furthermore, the volume of the portion of molten resin 8 in the recess 92 is significantly smaller than the volume of molten resin 8 in the rejection opening 52 and other locations, resulting in a larger surface area of ​​molten resin 8 in contact with the wall of the recess 92 for a given volume. This also leads to the portion of molten resin 8 in the recess 92 solidifying at a faster rate.

[0064] This avoids burrs caused by the curing of molten resin 8 in the gap between the lower surface 48A of the rejection plate 48 and the upper surface 56A of the base body 56, thus preventing surface defects and resin leakage that may be caused by burr deposition on the base 32. Furthermore, it prevents burr fragments from mixing with the molten resin and prevents any malfunctions in properly filling the magnet insertion hole 4 with molten resin.

[0065] Although the invention has been described in view of preferred embodiments, it will be readily understood by those skilled in the art that the invention is not limited to these embodiments and may be modified in a suitable manner without departing from the purpose of the invention.

[0066] For example, the can component 58 is not necessary for the present invention, and each recess 66 can be formed by a cut extending radially outward on the outer periphery of the resin can chamber 64 of the base 32 (base body 56). Recesses 66 and 92 can be formed on both the upper surface of the base 32 and the lower surface of the partition 36.

[0067] The claims may appear to relate only to the illustrated embodiment with the base 32 positioned on the lower side, but since this is only due to the limitations of the textual description, the invention should be interpreted as applicable to the opposite case where the base 32 is positioned on the upper side.

[0068] The method and apparatus of the present invention for manufacturing magnet embedded cores also include, as disclosed in JP2017-7353A, a transfer mold process suitable for loading solid resin 7 into resin tank chamber 64.

[0069] The constituent elements of the foregoing embodiments are not entirely necessary for the present invention, but can be appropriately omitted or substituted without departing from the purpose of the present invention.

[0070] Glossary

[0071] 1. Magnet Embedded Core

[0072] 2 Rotor core

[0073] 2A Lower end face

[0074] 3 shaft holes

[0075] 4 Magnet insertion hole

[0076] 4A Inner Surface

[0077] 4B Opening

[0078] 5. Magnets

[0079] 5A Outer Surface

[0080] 6 Resin

[0081] 7. Solid resin

[0082] 8 Molten Resin

[0083] 9. Thick rough edges

[0084] 10 Manufacturing equipment

[0085] 12 tie rods

[0086] 14. Movable pressure plate

[0087] 16 Fixed pressure plate

[0088] 18 Upper components

[0089] 19 strokes

[0090] 20. Enclosed components

[0091] 22 Springs

[0092] 24-core extruded component

[0093] 25. Protrusions

[0094] 26 Through Holes

[0095] 30 Lower component

[0096] 32 bases

[0097] 34 Rotor core retainer

[0098] 36 partitions

[0099] 38 board

[0100] 40 Movable meshing claws

[0101] 42 Fixed meshing claw

[0102] 44 Insertion Hole

[0103] 45 recess

[0104] 46 gate

[0105] 46A upper surface

[0106] 48 Rejection Plate

[0107] 48A Lower Surface

[0108] 50 gates

[0109] 52 Remove openings

[0110] 54 can retaining holes

[0111] 54A Inner Circumferential Surface

[0112] 56. Base Body

[0113] 56A Upper surface (outer surface)

[0114] 58 tank components

[0115] 58A Top Face

[0116] 60 flange

[0117] 62 plunger

[0118] 63 screws

[0119] 64 Resin Tank Chamber

[0120] 66 recess

[0121] 70 cylinder bore

[0122] 72 Piston

[0123] 74 Piston Rod

[0124] 76 Through Hole

[0125] 78 cylinder chamber

[0126] 80 manifold passage

[0127] 82 External piping

[0128] 84 Hydraulic generating device

[0129] 86 Electric heater

[0130] 90 incision

[0131] 92 recess

Claims

1. An apparatus for manufacturing a magnet embedded core, the magnet embedded core comprising: The rotor core is provided with a magnet insertion hole, which is a through hole that opens outward at two axial end faces of the rotor core. A magnet, wherein the magnet is positioned in the magnet insertion hole; The apparatus for manufacturing a magnet insert core includes: and resin, the resin filling the magnet insertion hole. A base, the base including a surface at which a resin tank chamber for storing molten resin opens; A partition, the partition being detachably placed on one surface of the base, the rotor core being placed on the partition, the partition having a communicating channel connecting the magnet insertion hole to the resin tank chamber; and A plunger, movably disposed in the resin tank chamber, for extruding the molten resin in the resin tank chamber into the magnet insertion hole via the communicating channel; The base includes: a base body having a can retaining hole that opens outward on the outer surface of the base body on the side of the one surface of the base; and a can member fitted into the can retaining hole; The communication channel includes a rejection opening having a circular cross-section and opening toward the resin tank chamber. The can retaining hole has a circular cross-section, and its inner diameter is larger than the inner diameter of the rejection opening. The resin tank chamber and the rejection opening are coaxially defined by the tank component; The end face of the tank component on the side of the base, relative to the outer surface of the base body, is farther away from the partition; and An annular recess is provided at the boundary between the base and the partition. The recess is defined by the end face of the tank member, the inner circumferential surface of the tank holding hole, and the surface of the partition located on one side of the base, such that the recess extends radially outward from the resin tank chamber and opens radially inward to surround the resin tank chamber and communicate directly with the resin tank chamber.

2. The apparatus for manufacturing a magnet embedded core according to claim 1, wherein, The thickness of the recess in the direction of movement of the plunger is from 0.1 mm to 0.3 mm.

3. A method for manufacturing the magnet embedded core using the apparatus for manufacturing a magnet embedded core according to claim 1 or 2, the magnet embedded core comprising: The rotor core is provided with a magnet insertion hole, which forms a through hole that opens outward at two axial end faces of the rotor core; the magnet is positioned in the magnet insertion hole; and resin, the resin filling the magnet insertion hole, The method includes an extrusion feeding step in which the molten resin in the resin tank chamber is extruded into the magnet insertion hole using the plunger. In the extrusion feeding step, the molten resin that advances into the recess and stops flowing in the recess solidifies faster than the molten resin flowing in other parts.

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