Apparatus for manufacturing armature

Abstract

To provide an apparatus for manufacturing an armature that can removing unnecessary resin material from an armature without additionally preparing a dedicated installation.SOLUTION: A apparatus for manufacturing a rotor 21 comprises: a stationary mold 22; a movable mold 23; and a stripper plate 24 that is arranged between the movable mold 23 and the stationary mold 22, is configured to be capable of moving relative to the movable mold 23, and forms a runner 46 and a gate 47 that extend in a moving direction of the movable mold 23 and in a direction orthogonal to the moving direction. A magnet 17 is fixed by filling a magnet housing hole 15 of a core 13, in which the magnet 17 is housed, with a resin material 18. The stripper plate 24 includes: a first split member 34 and a second split member 35 that are divided in the moving direction; and a first energization part 36 that energizes the first split member 34 and the second split member 35 away from each other in the moving direction. The first split member 34 forms the runner 46 with the movable mold 23. The second split member 35 forms the runner 46 and the gate 47.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a manufacturing apparatus for an armature such as a rotor of a magnet-embedded motor, for example.

Background Art

[0002] The rotor of a magnet-embedded motor has a core having a structure in which a plurality of iron core pieces are laminated. The core has a plurality of magnet accommodation holes penetrating in the lamination direction of the iron core pieces. In each of the magnet accommodation holes, the magnet is fixed by filling a resin material in a state where the magnet is accommodated.

[0003] As such a manufacturing apparatus for a rotor, conventionally, for example, the one shown in Patent Document 1 is known. The rotor manufacturing apparatus shown in this Patent Document 1 includes a first mold and a second mold that are arranged to face each other with the core sandwiched therebetween. The first mold includes a mold body and a support member that supports the core. The second mold includes a mold body and a caul plate having a filling pot for filling a thermosetting resin material into the magnet accommodation holes.

[0004] When manufacturing a rotor, first, the caul plate is attached to the core supported by the support member and with magnets accommodated in each of the plurality of magnet accommodation holes. After sandwiching the core in this state between the mold body of the first mold and the mold body of the second mold, the magnet is fixed by filling a thermosetting resin material from the filling pot of the caul plate into each of the plurality of magnet accommodation holes. Thereby, the rotor is manufactured.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] By the way, after manufacturing a rotor using the rotor manufacturing apparatus as described above, unnecessary resin material remaining in a plurality of filling pots of the cal plate is connected to the resin material filled in a plurality of magnet accommodation holes of the core. For this reason, it is necessary to separate the cal plate together with the unnecessary resin material from the rotor. Therefore, there is a problem that dedicated equipment for separating the cal plate from the rotor must be separately prepared.

Means for Solving the Problem

[0007] Hereinafter, means for solving the above problems and their operational effects will be described. The stator manufacturing apparatus for solving the above problems includes a fixed mold, a movable mold disposed opposite to the fixed mold and having a sprue, and a stripper plate disposed between the movable mold and the fixed mold and configured to be relatively movable with respect to the movable mold, and constituting a runner and a gate extending in a direction orthogonal to the moving direction of the movable mold. In a state where the fixed mold and the movable mold are clamped so that a core having magnets accommodated in magnet accommodation holes is sandwiched between the fixed mold and the stripper plate, a stator manufacturing apparatus for manufacturing a stator by filling a resin material into the magnet accommodation holes to fix the magnets, wherein the stripper plate has a first divided body and a second divided body divided in the moving direction, and a first biasing portion that biases the first divided body and the second divided body away from each other in the moving direction, the first divided body constitutes the runner together with the movable mold, and the second divided body constitutes the runner and the gate.

[0008] According to the above configuration, after filling the magnet accommodation hole of the core with a resin material to fix the magnet, when the movable mold is moved away from the fixed mold to open the mold between the fixed mold and the movable mold, the first divided body is moved away from the second divided body by the biasing force of the first biasing portion. Then, the resin material solidified in the runner and gate of the second divided body is pulled by the first divided body through the resin material solidified in the runner of the first divided body. As a result, the resin material solidified in the runner and gate of the second divided body is cut off at the gate portion. Therefore, unnecessary resin material can be removed from the armature without separately preparing dedicated equipment.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0010] Hereinafter, an embodiment will be described with reference to the drawings. <Rotor 11> As shown in FIGS. 1 and 2, a rotor 11 as an example of an armature of an embedded magnet type motor includes a core 13 formed by laminating a plurality of core pieces 12 made of circular electromagnetic steel sheets. That is, the core 13 is constituted by a laminate formed by laminating a plurality of core pieces 12. The core 13 has a central hole 14 and a plurality (16 in this embodiment) of magnet accommodation holes 15 that are located on the outer peripheral side of the central hole 14 and are provided at intervals in the circumferential direction.

[0011] The central hole 14 and each magnet accommodation hole 15 are formed to penetrate the core 13 in the direction in which the axis C of the core 13 extends (axial direction). That is, the central hole 14 and each magnet accommodation hole 15 extend along the axis C of the core 13 in a manner of penetrating the core 13. On the inner peripheral surface of the central hole 14, a pair of ridges 16 that face each other in the radial direction of the core 13 are provided so as to extend along the axis C. When viewed from the direction in which the axis C of each magnet accommodation hole 15 extends, the shape is a substantially rectangular shape with rounded both ends in the longitudinal direction.

[0012] Each magnet accommodation hole 15 houses a magnet 17 (permanent magnet) having a rectangular parallelepiped shape. Inside each magnet accommodation hole 15, a thermoplastic resin material 18 for fixing the magnet 17 is filled. The resin material 18 is constituted by, for example, polypropylene or the like.

[0013] <Manufacturing apparatus 21 of the rotor 11> As shown in FIGS. 3 and 5, a manufacturing apparatus 21 of a rotor 11 as an example of an armature manufacturing apparatus includes a fixed mold 22, a movable mold 23 arranged to face the fixed mold 22, and a stripper plate 24 arranged between the fixed mold 22 and the movable mold 23. The fixed mold 22 and the movable mold 23 are arranged to face each other in the vertical direction Z. The fixed mold 22 and the movable mold 23 are located apart from each other when the mold is opened as shown in FIG. 3, and approach each other as shown in FIG. 5 as the mold is clamped.

[0014] That is, the movable mold 23 moves to a position away from the fixed mold 22 when the mold is opened as shown in FIG. 3 and moves to a position approaching the fixed mold 22 when the mold is clamped as shown in FIG. 5 in the vertical direction Z, which is the direction facing the fixed mold 22. The moving direction of the movable mold 23 in the present embodiment coincides with the vertical direction Z.

[0015] In the manufacturing apparatus 21 for the rotor 11, the mold opening and closing of the fixed mold 22 and the movable mold 23 as described above are alternately and repeatedly executed. A cylinder 25 for injecting the molten resin material 18 is disposed in the movable mold 23. The cylinder 25 has a heater (not shown) for heating the resin material 18 to maintain the molten state of the resin material 18.

[0016] A sprue 26 extending in the vertical direction Z is formed at the center of the movable mold 23. The sprue 26 has a tapered shape such that the diameter increases downward. The nozzle 27 of the cylinder 25 is connected to the upper end of the sprue 26.

[0017] The manufacturing apparatus 21 for the rotor 11 manufactures the rotor 11 by filling the resin material 18 into each magnet accommodation hole 15 to fix the magnet 17 in a state where the core 13 in which the magnet 17 is accommodated in each magnet accommodation hole 15 is sandwiched between the fixed mold 22 and the stripper plate 24 with the fixed mold 22 and the movable mold 23 clamped.

[0018] In a state where the fixed mold 22 and the movable mold 23 are opened, the core 13 before filling the resin material 18 into the magnet accommodation hole 15 is disposed between the fixed mold 22 and the stripper plate 24 in a manner such that the axial direction coincides with the vertical direction Z. Specifically, the core 13 in which the magnet 17 is accommodated in the magnet accommodation hole 15 is disposed between the fixed mold 22 and the stripper plate 24 together with the intermediate plate 28 and the spacer 29.

[0019] The intermediate plate 28 is for transporting the core 13 between the fixed die 22 and the stripper plate 24, or for transporting the core 13 from between the fixed die 22 and the stripper plate 24. A cylindrical post 30 is fixed to the central portion of the intermediate plate 28. The post 30 penetrates through the spacer 29 and also penetrates through the central hole 14 of the core 13. At this time, the spacer 29 is positioned between the intermediate plate 28 and the core 13. A plurality of pins 31 are provided at the tip of the post 30.

[0020] The spacer 29 and the core 13 are fixed in their relative positions in the circumferential direction with respect to the post 30. The spacer 29 is used when extracting the core 13 from the post 30. That is, the spacer 29 is pressed in a direction away from the intermediate plate 28 by pins or the like (not shown) passed through the through hole 32 of the intermediate plate 28. When the core 13 is pressed by the pressed spacer 29, the core 13 is extracted from the post 30.

[0021] <stripper plate 24> As shown in FIGS. 3 and 5, the stripper plate 24 disposed between the core 13 and the movable die 23 contacts the upper surface of the core 13 when the fixed die 22 and the movable die 23 are clamped. In this case, the relative position of the stripper plate 24 in the circumferential direction with respect to the post 30 of the intermediate plate 28 is fixed by the fitting of a plurality of pins 31 and a plurality of holes 33 formed in the lower surface of the stripper plate 24.

[0022] The stripper plate 24 has a first divided body 34 and a second divided body 35 divided in the vertical direction Z which is the moving direction of the movable die 23, and a plurality of first biasing portions 36 for biasing the first divided body 34 and the second divided body 35 away from each other in the vertical direction Z. A central concave portion 37 is formed at the central portion of the upper surface of the second divided body 35. The first divided body 34 is disposed in the central concave portion 37. In a state where the first divided body 34 is completely accommodated in the central concave portion 37 of the second divided body 35, that is, in a state where the lower surface of the first divided body 34 contacts the bottom surface of the central concave portion 37, the upper surface of the second divided body 35 and the upper surface of the first divided body 34 are flush.

[0023] The plurality of first biasing portions 36 are disposed at positions corresponding to the peripheral edge of the first divided body 34 in the second divided body 35. The first biasing portion 36 has a case 38 provided so as to protrude downward from the lower surface of the second divided body 35, and a first coil spring 39 supported by the case 38. The lower end of the first coil spring 39 contacts the bottom surface of the case 38, and the upper end contacts the bottom surface of a peripheral recess 40 provided on the lower surface of the peripheral edge of the first divided body 34.

[0024] The first coil spring 39 always biases the first divided body 34 upward at the bottom surface of the peripheral recess 40. When the fixed die 22 and the movable die 23 are opened, the first divided body 34 floats upward from the bottom surface of the central recess 37 of the second divided body 35 due to the biasing force of the first coil spring 39. A plurality of support holes 41 and a plurality of guide holes 42 are formed side by side on the peripheral edge of the second divided body 35. Each support hole 41 and each guide hole 42 are formed so as to penetrate the second divided body 35 in the vertical direction Z. The support holes 41 are located inside the guide holes 42.

[0025] At positions corresponding to the respective support holes 41 of the second divided body 35 on the peripheral edge of the lower surface of the movable die 23 in the vertical direction Z, support shafts 43 extending straight downward are provided. The length of the support shaft 43 is longer than the thickness of the second divided body 35. The support shaft 43 is slidably inserted into the support hole 41 of the second divided body 35. At the lower end of the support shaft 43, an enlarged diameter portion 44 having a diameter slightly larger than the diameter of the support hole 41 is provided.

[0026] The stripper plate 24 engages with the enlarged diameter portion 44 on the lower surface of the second divided body 35 due to its own weight. The stripper plate 24 is supported so as to be suspended from the movable die 23 via the respective support shafts 43 when the fixed die 22 and the movable die 23 are opened. Since the support shafts 43 are slidably inserted into the respective support holes 41, the stripper plate 24 is configured to be relatively movable in the vertical direction Z with respect to the movable die 23.

[0027] At positions corresponding to the respective guide holes 42 of the second divided body 35 at the peripheral edge of the lower surface of the movable type 23 in the vertical direction Z, guide shafts 45 extending straight downward are provided. The length of the guide shaft 45 is substantially the same as that of the support shaft 43. The guide shaft 45 is slidably inserted into the guide hole 42 of the second divided body 35. Each guide shaft 45 guides the movement of the stripper plate 24 along the support shaft 43 when the guide hole 42 of the stripper plate 24 slides as the stripper plate 24 slides the support shaft 43 in each support hole 41.

[0028] The stripper plate 24 constitutes a runner 46 and a gate 47 extending in the vertical direction Z which is the moving direction of the movable type 23 and in the horizontal direction which is orthogonal to the vertical direction Z. Among the runners 46, the portion extending in the vertical direction Z is the vertical runner 48, while the portion extending in the horizontal direction is the horizontal runner 49.

[0029] As shown in FIGS. 3 to 5, a groove 50 extending radially in the horizontal direction from the central portion is formed at the central portion of the upper surface of the first divided body 34. The first divided body 34 constitutes the horizontal runner 49 with the groove 50 and the lower surface of the movable type 23 by the upper surface coming into contact with the lower surface of the movable type 23. That is, the first divided body 34 constitutes the horizontal runner 49 extending radially in the horizontal direction from the central portion together with the movable type 23. A central resin reservoir 51 for accumulating the resin material 18 is recessed at the central portion of the radially extending groove 50 in the first divided body 34.

[0030] The horizontal runner 49 of the present embodiment branches into eight pieces at equal intervals in the circumferential direction from the central portion of the upper surface of the first divided body 34 and extends radially outward. Each of the eight branched horizontal runners 49 further branches into three branch passages 52 at the tip end. Among the three branch passages 52 branched at the tip end of the horizontal runner 49, the middle branch passage 52 forms a tip resin reservoir 53 where the resin material 18 accumulates, and the upper ends of the remaining two branch passages 52 are respectively connected to the vertical runners 48.

[0031] The vertical runner 48 extends from the branch passage 52 to the lower surface of the second divided body 35. The vertical runner 48 is tapered so that the diameter becomes smaller toward the bottom. The lower end of the vertical runner 48 opens at the lower surface of the second divided body 35, and the gate 47 is formed by the opening. The vertical runner 48 is divided into two at the boundary between the lower surface of the first divided body 34 and the bottom surface of the central concave portion 37 of the second divided body 35. Therefore, the first divided body 34 constitutes the upstream portion of the vertical runner 48, and the second divided body 35 constitutes the downstream portion other than the upstream portion of the vertical runner 48 and the gate 47.

[0032] At positions corresponding in the vertical direction Z to the portions including a part of each of the eight horizontally branched runners 49 on the upper surface of the first divided body 34 in the movable mold 23, second biasing portions 54 are respectively provided. Each second biasing portion 54 biases the upper surface of the first divided body 34 downward toward the side of the second divided body 35 at the portion including a part of the horizontal runner 49. The biasing force of the second biasing portion 54 is weaker than that of the first biasing portion 36.

[0033] The second biasing portion 54 includes a housing recess 55 that opens to the lower surface of the movable mold 23, a second coil spring 56 housed in the housing recess 55, and a columnar block 57 that is housed in the housing recess 55 and fixed to the lower end of the second coil spring 56. The biasing force of the second coil spring 56 is weaker than that of the first coil spring 39. The second coil spring 56 has a smaller diameter than the block 57. The housing recess 55 has a first housing portion 58 and a second housing portion 59 located below the first housing portion 58.

[0034] The diameter of the first accommodating portion 58 is smaller than the diameter of the second accommodating portion 59. Therefore, a stepped surface 60 is formed between the first accommodating portion 58 and the second accommodating portion 59. The second coil spring 56 is accommodated in the first accommodating portion 58. A block 57 is accommodated in the second accommodating portion 59. The upper end of the second coil spring 56 is fixed to the upper end of the first accommodating portion 58.

[0035] When the fixed mold 22 and the movable mold 23 are opened, the second coil spring 56 extends due to the self-weight of the block 57, and the lower part of the block 57 protrudes downward from the accommodating recess 55. When the fixed mold 22 and the movable mold 23 are clamped, the block 57 is pushed up by the stripper plate 24 and the second coil spring 56 contracts. At this time, the upper surface of the block 57 abuts against the stepped surface 60, and the lower surface of the block 57 is flush with the lower surface of the movable mold 23.

[0036] <Manufacturing method of the rotor 11> Next, the manufacturing method of the rotor 11 will be described as an operation of the embodiment. The manufacturing method of the rotor 11 includes a supporting step, a magnet accommodating step, a clamping step, an injection step, and a taking-out step.

[0037] <Supporting step> As shown in FIG. 3, in the supporting step, in the open state of the fixed mold 22 and the movable mold 23, after passing a spacer 29 through a post 30 of the intermediate plate 28, the central hole 14 of the core 13 is further passed through the post 30. Thereby, the core 13 is supported by the intermediate plate 28 together with the spacer 29. The core 13 in the state supported by the intermediate plate 28 is disposed on the fixed mold 22. That is, the core 13 in the state supported by the intermediate plate 28 is disposed between the fixed mold 22 and the stripper plate 24.

[0038] <Magnet accommodating step> As shown in FIG. 3, in the magnet insertion step, the magnets 17 are inserted into the respective magnet accommodation holes 15 of the core 13 supported together with the spacer 29 by the intermediate plate 28 in the support step from above to be accommodated. The number of magnets 17 accommodated in one magnet accommodation hole 15 is usually one or two.

[0039] <Molding clamping step> As shown in FIG. 5, in the molding clamping step, the movable mold 23 at the predetermined mold open position shown in FIG. 3 is lowered. Then, after the stripper plate 24 is placed on the core 13, the stripper plate 24 is pressed from above by the movable mold 23. Thereby, the movable mold 23 and the fixed mold 22 are clamped.

[0040] In the state where the movable mold 23 and the fixed mold 22 are clamped, the first divided body 34 is pressed downward by the movable mold 23 against the biasing force of the first coil spring 39 and is completely accommodated in the central recess 37 of the second divided body 35. That is, the lower surface of the first divided body 34 comes into contact with the bottom surface of the central recess 37.

[0041] At this time, the sprue 26 and the horizontal runner 49 are connected, and the vertical runners 48 that were divided into two at the boundary between the lower surface of the first divided body 34 and the bottom surface of the central recess 37 of the second divided body 35 are connected. The vertical runner 48 communicates with the magnet accommodation hole 15 of the core 13 at the gate 47.

[0042] Also, as shown in FIGS. 4 and 5, in the state where the movable mold 23 and the fixed mold 22 are clamped, the block 57 is pushed up by the stripper plate 24 against the biasing force of the second coil spring 56. At this time, the upper surface of the block 57 abuts against the stepped surface 60, and the lower surface of the block 57 contacts a portion including a part of the horizontal runner 49 on the upper surface of the first divided body 34 in a state flush with the lower surface of the movable mold 23.

[0043] <Injection step> As shown in Fig. 5, in the injection step, the molten resin material 18 is supplied from the cylinder 25 to the sprue 26. Then, the molten resin material 18 sequentially flows through the sprue 26, the horizontal runner 49, and the vertical runner 48 and is injected and filled into the magnet accommodation holes 15 from each gate 47.

[0044] Thereafter, the resin material 18 filled in each magnet accommodation hole 15 cools and solidifies, so that the magnet 17 is fixed in each magnet accommodation hole 15. Thereby, the rotor 11 shown in Figs. 1 and 2 is manufactured. In this case, the resin material 18 remaining in the sprue 26, the horizontal runner 49, and the vertical runner 48 also solidifies.

[0045] <Taking-out step> As shown in Fig. 6, in the taking-out step, first, in order to take out the rotor 11 from the manufacturing apparatus 21, the mold is opened between the fixed mold 22 and the movable mold 23 by raising the movable mold 23. When the movable mold 23 is raised, the downward pressing force of the movable mold 23 on the first divided body 34 no longer acts. Then, the first divided body 34 is lifted from the bottom surface of the central recess 37 of the second divided body 35 by the biasing force of the first coil spring 39.

[0046] At this time, the biasing force of the second coil spring 56 acts on the first divided body 34 in a direction opposite to the biasing force of the first coil spring 39. However, the biasing force of the second coil spring 56 is weaker than the biasing force of the first coil spring 39. For this reason, the biasing force of the first coil spring 39 does not prevent the first divided body 34 from being lifted from the bottom surface of the central recess 37 of the second divided body 35 due to the biasing force of the second coil spring 56.

[0047] Furthermore, at this time, since the second divided body 35 receives the reaction force when the first coil spring 39 lifts the first divided body 34 by its biasing force, the second divided body 35 is suppressed from rising following the movable mold 23.

[0048] When the first split body 34 is lifted from the bottom surface of the central recess 37 of the second split body 35 by the biasing force of the first coil spring 39, the resin material 18 solidified in the vertical runner 48 and the gate 47 of the second split body 35 is pulled up by the first split body 34 through the resin material 18 solidified in the horizontal runner 49 and the vertical runner 48 of the first split body 34. As a result, the resin material 18 solidified in the vertical runner 48 and the gate 47 of the second split body 35 is cut at the thinnest part of the gate 47, so that the unnecessary resin material 18 connected to the rotor 11 is removed.

[0049] As shown in FIGS. 4 and 7, when the movable mold 23 is continuously lifted, the first split body 34 is biased downward in the direction opposite to the moving direction of the movable mold 23 together with the resin material 18 solidified in the horizontal runner 49 of the first split body 34 by the second biasing portion 54. As a result, the resin material 18 solidified in the sprue 26 is cut at the connecting portion with the nozzle 27 of the thinnest cylinder 25 in the sprue 26.

[0050] Continuing, as shown in FIG. 8, when the movable mold 23 is lifted, the stripper plate 24 is lifted together with the movable mold 23 in a state of being suspended from the movable mold 23 via the support shaft 43. At this time, the unnecessary resin material 18 solidified in the sprue 26 and the runner 46 remains on the stripper plate 24 side. When the movable mold 23 is lifted to a predetermined mold opening position, the stripper plate 24 is disposed above the core 13 in a state of being separated from the core 13.

[0051] At this time, since the unnecessary resin material 18 remaining on the stripper plate 24 side is in a state of being slightly lifted from the vertical runner 48 of the second split body 35, the adhesion of this unnecessary resin material 18 to the wall surface of the vertical runner 48 of the second split body 35 is almost eliminated. Therefore, the unnecessary resin material 18 remaining on the stripper plate 24 side can be easily grasped and removed by a robot arm or the like. The unnecessary resin material 18 removed from the stripper plate 24 is reused.

[0052] Subsequently, after removing the rotor 11 supported by the intermediate plate 28 from between the fixed mold 22 and the stripper plate 24, only the rotor 11 is extracted and removed from the post 30 of the intermediate plate 28. Thereby, the rotor 11 shown in FIGS. 1 and 2 is obtained.

[0053] <Effects of the Embodiment> According to the embodiment described in detail above, the following effects are exhibited. (1) The manufacturing apparatus 21 for the rotor 11 includes a fixed mold 22, a movable mold 23 disposed opposite to the fixed mold 22 and having a sprue 26, and a stripper plate 24 disposed between the movable mold 23 and the fixed mold 22 and configured to be relatively movable with respect to the movable mold 23, and constituting a runner 46 and a gate 47 extending in the moving direction of the movable mold 23 and a direction orthogonal to the moving direction. The manufacturing apparatus 21 for the rotor 11 manufactures the rotor 11 by filling the resin material 18 into the magnet accommodation hole 15 to fix the magnet 17 in a state where the fixed mold 22 and the movable mold 23 are clamped so that the core 13 in which the magnet 17 is accommodated in the magnet accommodation hole 15 is sandwiched between the fixed mold 22 and the stripper plate 24. The stripper plate 24 has a first divided body 34 and a second divided body 35 divided in the moving direction, and a first biasing portion 36 that biases the first divided body 34 and the second divided body 35 away from each other in the moving direction. The first divided body 34 constitutes the runner 46 together with the movable mold 23. The second divided body 35 constitutes the runner 46 and the gate 47.

[0054] According to the above configuration, after filling the magnet accommodation hole 15 of the core 13 with the resin material 18 to fix the magnet 17, when the movable mold 23 is moved away from the fixed mold 22 to open the mold between the fixed mold 22 and the movable mold 23, the first dividing body 34 is moved away from the second dividing body 35 by the biasing force of the first biasing portion 36. Then, the resin material 18 solidified in the runner 46 and the gate 47 of the second dividing body 35 is pulled by the first dividing body 34 through the resin material 18 solidified in the runner 46 of the first dividing body 34. Thereby, the resin material 18 solidified in the runner 46 and the gate 47 of the second dividing body 35 is cut off at the gate 47 portion. Therefore, the unnecessary resin material 18 can be removed from the rotor 11 without separately preparing dedicated equipment.

[0055] (2) In the manufacturing apparatus 21 of the rotor 11, the movable mold 23 is provided with a second biasing portion 54 that biases the first dividing body 34 toward the second dividing body 35 in a portion including the runner 46. The biasing force of the second biasing portion 54 is weaker than that of the first biasing portion 36.

[0056] According to the above configuration, after filling the magnet accommodation hole 15 of the core 13 with the resin material 18 to fix the magnet 17, when the movable mold 23 is moved away from the fixed mold 22 to open the mold between the fixed mold 22 and the movable mold 23, the first dividing body 34 is biased in a direction opposite to the moving direction of the movable mold 23 together with the resin material 18 solidified in the runner 46 of the first dividing body 34 by the second biasing portion 54. Thereby, the resin material 18 solidified in the sprue 26 of the movable mold 23 is cut off at the upstream end of the resin material 18 in the sprue 26. Therefore, simply by opening the mold between the fixed mold 22 and the movable mold 23, the resin material 18 solidified in the sprue 26 of the movable mold 23 can be cut.

[0057] <Modification Example> The above embodiment can be implemented with the following modifications. Also, the above embodiment and the following modification examples can be implemented in combination with each other within a technically non - conflicting range.

[0058] ·When the movable mold 23 is raised to open the mold between the fixed mold 22 and the movable mold 23 after the manufacture of the rotor 11, a biasing member for suppressing the rise of the second divided body 35 following the movable mold 23 may be provided on the movable mold 23.

[0059] ·The second biasing portion 54 may be omitted. ·The biasing force of the second biasing portion 54 may be equal to or greater than the biasing force of the first biasing portion 36. ·The armature is not limited to the rotor 11 and may be a stator.

[0060] ·The manufacturing apparatus for the armature may be applied to the manufacturing apparatus for the stator.

Explanation of Reference Numerals

[0061] 11…Rotor as an example of the armature 12…Core piece 13…Core 14…Central hole 15…Magnet accommodation hole 16…Ridge 17…Magnet 18…Resin material 21…Manufacturing apparatus 22…Fixed mold 23…Movable mold 24…Stripper plate 25…Cylinder 26…Sprue 27…Nozzle 28…Intermediate plate 29…Spacer 30…Post 31…Pin 32…Through hole 33…Hole 34…First divided body 35…Second divided body 36…First biasing portion 37…Central concave portion 38…Case 39…First coil spring 40…Peripheral concave portion 41…Support hole 42…Guide hole 43…Support shaft 44…Diameter-expanded part 45…Guide shaft 46…Runner 47…Gate 48…Vertical runner 49…Horizontal runner 50…Groove 52…Branching passage 54…Second biasing part 55…Receiving recess 56…Second coil spring 57…Block 58…First receiving part 59…Second receiving part 60…Step surface C…Axis line Z…Vertical direction

Claims

1. a fixed mold, a movable mold arranged opposite to the fixed mold and having a sprue, and a stripper plate arranged between the movable mold and the fixed mold, configured to be movable relative to the movable mold, and constituting a runner and a gate extending in a moving direction of the movable mold and in a direction perpendicular to the moving direction, an armature manufacturing apparatus for manufacturing an armature by filling a resin material into the magnet accommodating hole and fixing the magnet in a state in which the fixed die and the movable die are clamped so that a core having a magnet accommodated in the magnet accommodating hole is sandwiched between the fixed die and the stripper plate, the armature comprising: the stripper plate has a first divided body and a second divided body divided in the moving direction, and a first biasing portion that biases the first divided body and the second divided body so as to move away from each other in the moving direction, the first divided body constitutes the runner together with the movable die, The second divided body constitutes the runner and the gate.

2. the movable die is provided with a second biasing portion that biases the first divided body toward the second divided body at a portion including the runner, 2. The apparatus according to claim 1, wherein the second biasing portion has a biasing force weaker than that of the first biasing portion.

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