JP4948040B2 - Resin sealing method for rotor laminated core - Google Patents

Description

The present invention relates to a resin sealing method for a rotor laminated iron core in which a permanent magnet is inserted into a plurality of resin sealing portions provided around and fixed by a resin member.

Conventionally, as a method of fixing a permanent magnet to a rotor laminated iron core (also referred to as a rotor core) used in a motor, there is a method of fixing the permanent magnet with a resin member.
As a specific method, as shown in FIG. 11A, a plurality of core pieces 90 are stacked, and a plurality of resin sealing portions (magnets) for inserting a permanent magnet 92 around a central shaft hole 91 are provided. The rotor laminated core 94 in which the holes 93 are formed is set in a resin sealing device (not shown) having an upper mold and a lower mold. Then, a liquid resin member 95 is injected from a resin reservoir (pot) provided at a predetermined position of the upper mold into the resin sealing portion 93 via a resin flow path (runner) and a gate. Is cured (for example, see Patent Document 1).
And after hardening the resin member 95, the resin member 96 which protruded on the surface of the rotor lamination | stacking iron core 94, ie, the resin member (cal) which remained under the plunger which is arrange | positioned in the resin reservoir part and pushes out the resin member, and resin The resin member (runner residue) remaining in the flow path is removed.

JP 2002-34187 A

However, even if the resin member 96 protruding from the surface of the rotor laminated core 94 is removed, for example, as shown in FIGS. 11B and 11C, the resin member 96 oozes around the resin sealing portion 93 and hardens. In addition to the resin member (burr) 97 remaining, the cured resin member 98 remains in a protruding shape at the gate portion. As described above, the hardened resin members 97 and 98 remaining on the surface of the rotor laminated core 94 cause troubles in the subsequent assembly work of the rotor, and therefore must be removed in advance. Further steps are required.
In particular, of the remaining cured resin members 97 and 98, the resin member 97 that has oozed out at the four corners of the resin sealing portion 93 can be easily removed by brushing, but the protrusion formed on the gate portion. The resin member 98 is so strong that it cannot be removed by brushing. For this reason, it is necessary to perform another mechanical polishing, which is a cause of requiring an extra work step and time.
It should be noted that when removing the resin member 96 protruding from the surface of the rotor laminated iron core 94, a new process for removing the resin member 96 is required, which requires time and effort. In order to remove this, a dedicated device must be prepared, which hinders reduction in manufacturing costs.

The present invention has been made in view of such circumstances, and it is possible to simplify and further eliminate the work of removing the cured resin member adhering to the surface of the rotor laminated iron core. and to provide a resin sealing method capable of manufacturing a laminated rotor core to.

According to the first aspect of the present invention, there is provided a resin sealing method for a rotor laminated core, wherein a resin sealing portion of the rotor laminated core has a resin from a resin reservoir formed in a mold in contact with the rotor laminated core. In the resin sealing method of the rotor laminated core filling the member,
The resin reservoir extends to an end of the mold that contacts the rotor laminated core, and is cut to communicate with the resin sealing part on the core piece of the rotor laminated core on the side in contact with the mold. A notch guide portion is formed, and the resin member is filled from the resin reservoir portion to the resin sealing portion via the notch guide portion, and the protrusion is formed in the die in the notch guide portion. A recess portion is formed on the surface of the resin member of the notch guide portion that has been inserted and cured .

According to a second aspect of the present invention, there is provided a resin sealing method for a rotor laminated core, in which a resin member is filled into a resin sealing portion of the rotor laminated core from a resin reservoir formed in a mold in contact with the rotor laminated core. In the resin sealing method of the rotor laminated core,
The resin reservoir extends to an end of the mold that contacts the rotor laminated core, and is cut to communicate with the resin sealing part on the core piece of the rotor laminated core on the side in contact with the mold. A notch guide portion is formed, and the resin member is filled from the resin reservoir portion into the resin sealing portion via the notch guide portion, and the resin member of the resin reservoir portion is disposed in the notch guide portion. The plunger which pushes out is inserted, and the recessed part is formed in the surface of the resin member of the said notch guide part hardened | cured.

The resin sealing method for a rotor laminated core according to claim 1 or 2 is a notch guide portion for feeding a resin member from a resin reservoir to a resin sealing portion to an iron core piece of a rotor laminated core on the side in contact with a mold. Therefore, the cured resin member after resin sealing can be folded in the notch guide portion. Accordingly, the cured resin member is accommodated in the notch guide portion and does not protrude to the surface of the rotor laminated core, so that the rotor laminated core can be manufactured in a shorter time with better workability than in the past.

Particularly, in the resin sealing method of the rotor laminated iron core according to claim 2 , since the plunger for pushing out the resin member in the resin reservoir portion is fitted into the notch guide portion, the remaining resin member is surely accommodated in the notch guide portion. The resin member which protrudes on the surface of a rotor lamination | stacking iron core can be formed.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
1 (A), (B), FIG. 2, and FIG. 4 (A), the method for resin-sealing a rotor laminated core according to the first embodiment of the present invention includes a rotor laminated core ( In the following, a resin member 14 is filled from a resin reservoir 13 formed in an upper mold (an example of a mold) 12 that is in contact with the rotor laminated core 10 into a resin-sealed portion 11 of the laminated core 10. The resin reservoir 13 extends to the end (for example, the lower end surface) of the upper mold 12 that contacts the rotor laminated core 10 and is attached to the core piece 15 of the rotor laminated core 10 on the side that the upper mold 12 contacts. Then, a notch guide portion 16 communicating with the resin sealing portion 11 is formed, and the resin member 14 is filled into the resin sealing portion 11 from the resin reservoir portion 13 via the notch guide portion 16. This will be described in detail below.

As shown in FIGS. 1 (A) and 1 (B), the laminated iron core 10 is formed by punching a magnetic steel sheet having a thickness of, for example, about 0.5 mm or less in an annular shape, and sequentially laminating a plurality of punched iron core pieces 15. Configured. In addition, as a lamination | stacking method of the some iron core piece 15, although it can use combining any one or 2 or more of caulking, welding, and adhesion | attachment, you may just pile up.
As shown in FIGS. 1 (A), 1 (B), 2 and 4 (A), there is a resin sealing portion penetrating in the vertical direction around the shaft hole 17 formed in the center of the laminated core 10. 11 are formed at equal intervals, and after inserting the permanent magnet 18 into the resin sealing portion 11, the laminated core 10 is set in the resin sealing device 19, and the liquid resin member 14 is supplied and cured. . As the resin member, for example, a thermosetting resin or a thermoplastic resin such as an epoxy resin conventionally used for manufacturing a semiconductor device can be used.
Here, the resin sealing device 19 to be used will be described.

A resin sealing device 19 shown in FIG. 2 has an upper mold 12 provided at the upper part of the laminated core 10 and a lower mold 20 provided at the lower part, and the laminated iron core 10 disposed therebetween is connected to the upper mold 12. And the lower mold 20 are pressed. The upper mold 12 is formed with a resin reservoir 13 that heats the raw material (pellet shape) of the resin member 14 to make it liquid.
A plunger 21 that can be moved up and down is provided in the resin reservoir 13 of the resin sealing device 19. By this plunger 21, the liquid resin member 14 pushed out from the resin reservoir 13 causes the resin flow path 22 provided at the downstream end of the resin reservoir 13, that is, the lower surface of the upper mold 12 and the laminated iron core 10. The resin sealing part 11 is filled through the notch guide part 16 through the upper surface. And the permanent magnet 18 inserted in the resin sealing part 11 can be fixed with the resin member 14 by heat-hardening the resin member 14 with which the resin sealing part 11 was filled.
As shown in FIG. 3, the resin sealing device has an upper mold 23 and a lower mold (an example of a mold) 24, and heats the raw material (pellet shape) of the resin member 14 to the lower mold 24. It is also possible to use the resin sealing device 25 in which the resin reservoir portion 13 that is liquefied is formed (the same applies to the embodiments described below). In this case, the resin reservoir 13 extends to the end of the lower mold 24 (for example, the upper end surface).

As shown in FIG. 4A, the number of the resin reservoirs 13 provided in the upper mold 12 of the resin sealing device 19 is the same as the number of the resin sealing portions 11 provided in the laminated core 10. A plurality (eight here) are provided at equal intervals in the direction. Accordingly, the resin member 14 can be supplied from the resin reservoir 13 to the single (one) resin sealing portion 11 via the resin flow path 22 and the notch guide portion 16.
As shown in FIG. 4B, the number of resin reservoirs 13 provided on the upper mold 12 of the resin sealing device 19 is set to the number of resin sealing parts 11 provided on the laminated core 10 (here, 8). (4 pieces here) can also be reduced. Thereby, a plurality (for example, two or three) of resin sealing portions 11 from the resin reservoir portion 13 communicate with the resin reservoir portion 13 and a plurality of resin flow paths 26 provided at the bottom of the upper mold, The resin member 14 can be supplied through the notch guide portion 16. Depending on the shape of the laminated core, the number of the resin reservoirs 13 may be increased more than the number of the resin sealing parts 11.
Here, the resin reservoir portion 13 is provided on the radially inner side of the resin sealing portion 11 in plan view, but may be provided on the radially outer side.
4A and 4B, reference numeral 27 denotes a detent (protrusion) of the laminated core 10.

The resin member 14 is supplied to the resin sealing portion 11 using such a resin sealing device 19.
As shown in FIGS. 1 (A) and 4 (A), the resin sealing portion 11 is located on the radially outer side of the resin reservoir portion 13 in plan view, and the resin sealing portion 11 and the resin reservoir portion 13 are different. In position. A resin flow path 22 communicating with the downstream end of the resin reservoir 13 is formed at the bottom of the upper mold 12, and the resin member 14 is formed from the resin reservoir 13 to the notch guide 16 via the resin flow path 22. Will be sent.

Further, since the resin flow path 22 is a flow path for supplying the resin member 14, the inner width thereof is formed narrower than the inner width of the notch guide portion 16 (the same applies to the embodiments described below). .
Here, a part of the upper mold 12 at the downstream end of the resin flow path 22 is formed with a protruding portion 28 that protrudes into the notch guide portion 16.
The protrusion 28 is preferably provided over the entire inner width in the circumferential direction of the notch guide 16, but may be a part. Further, the shape may be, for example, a trapezoid, a rectangle, or an ellipse in a side sectional view.

The protrusion 28 has a maximum radial length R1 of, for example, about 5% to 30% of the maximum radial length R2 of the notch guide portion 16, and a protruding thickness into the notch guide portion 16. D1 is, for example, about 10% to 50% of the maximum depth D2 of the notch guide portion 16.
Thereby, the resin member 14 in the notch guide part 16 becomes a partly recessed shape. Therefore, as shown in FIG. 1 (B), the resin member (cal) 29 remaining below the plunger 21 is easily bent from the recessed portion by applying force so as to push it outward in the radial direction. Protrusion of the resin member 14 to the surface of the iron core 10 can be prevented.
Note that the bottom portion of the upper mold that overlaps the notch guide portion in plan view may be projected into the notch guide portion 16 as indicated by a two-dot chain line in FIG. Thereby, it can further prevent that the resin member in a notch guide part protrudes on the surface of a laminated iron core.

A resin sealing method for a rotor laminated core according to the second embodiment of the present invention will be described with reference to FIGS. 5 (A) and 5 (B).
As shown in FIG. 5 (A), the resin sealing portion 11 of the rotor laminated core 30 is located on the outside in the radial direction of the resin reservoir portion 13 of the upper mold (an example of a mold) 31 in plan view. The sealing part 11 and the resin reservoir part 13 are in different positions. Only the resin reservoir 13 is formed in the upper mold 31 (no resin flow path is formed at the bottom), and the core pieces 32 (a plurality of pieces from the top: The resin flow path 33 is formed in 2 sheets here. The resin flow path 33 is included in the notch guide portion 34. As a result, the resin member 14 is sent from the resin reservoir 13 to the notch guide 34.
The upper die 31 at the downstream end of the resin reservoir 13 is provided with a protruding portion 35 that is partially cut out and protrudes into the guide portion 34. The protrusion 35 has the same configuration as the protrusion 28 described above.
Therefore, the cured resin member 36 can be easily folded on the surface of the rotor laminated core 30 starting from this portion.

A resin sealing method for a rotor laminated core according to the third embodiment of the present invention will be described with reference to FIGS. 6 (A) and 6 (B).
As shown in FIG. 6 (A), the resin sealing portion 11 of the rotor laminated core 40 is located on the outer side in the radial direction of the resin reservoir portion 13 of the upper mold (an example of a mold) 41 in plan view. The resin sealing portion 11 and the resin reservoir portion 13 are located at different positions, and the resin reservoir portion 13 is in the notch guide portion 42 in plan view. The position of the inner surface 43 in the radial direction of the notch guide portion 42 is disposed substantially at the same position as a part of the inner surface 44 (the inner surface in the radial direction) of the resin reservoir 13 in plan view. The plunger 21 that pushes out the member 14 protrudes from the end of the upper die 41, that is, the lower surface 45, and can be fitted into the notch guide portion 42.

Thereby, it can prevent that the resin member 14 in the notch guide part 42 protrudes on the surface of the rotor lamination | stacking iron core 40. FIG.
In addition, as shown by the two-dot chain line in FIG. 6A, the position of the radially inner side surface of the notch guide portion is radially inward from a part of the inner surface of the resin reservoir portion (for example, You may set to 1 mm or more and about 5 mm or less. Thereby, for example, even if the relative position between the notch guide part and the resin reservoir part is slightly deviated, the plunger can be reliably fitted into the notch guide part without contacting the upper surface of the laminated iron core.

A resin sealing method for a rotor laminated core according to the fourth embodiment of the present invention will be described with reference to FIGS. 7 (A) and 7 (B).
As shown in FIGS. 7A and 7B, the resin sealing portion 11 of the rotor laminated core 50 and the resin reservoir portion 13 of the upper die (an example of a mold) 51 are all in plan view. In addition, the resin reservoir 13 is in the notch guide portion 52. The peripheral edge of the notch guide portion 52 is disposed at substantially the same position as the peripheral edge of the resin reservoir 13 in plan view, and the plunger 21 that pushes out the resin member 14 protrudes from the lower surface 53 of the upper mold 51. Thus, it can be inserted into the notch guide portion 52.

Thereby, it can prevent that the resin member 14 in the notch guide part 52 protrudes on the surface of the rotor lamination | stacking iron core 50. FIG.
Here, as shown by a two-dot chain line in FIG. 7 (B), the periphery of the notch guide portion is made larger than the periphery of the resin reservoir portion, so that the plunger is not brought into contact with the upper surface of the laminated iron core. It can also be surely inserted into the notch guide part.
In addition, the resin sealing part and the resin reservoir part may be in a position where a part thereof overlaps in plan view. Also at this time, the resin reservoir is in the notch guide portion in plan view. Further, the resin reservoir part may protrude from the mold and fit into the notch guide part.

The resin sealing method of the rotor laminated core according to the fifth and sixth embodiments of the present invention will be described with reference to FIGS. 8A, 8B, 9A, and 9B. .
As shown in FIGS. 8A, 9A, and 9B, the resin sealing portion 11 of the rotor laminated iron core 60 is a resin reservoir of an upper mold (an example of a mold) 61 in a plan view. The resin sealing portion 11 and the resin reservoir 62 are located at different positions on the outer side in the radial direction of the portion 62. A resin flow path 63 communicating in the radial direction is formed at the bottom end of the upper mold 61 at the downstream end of the resin reservoir 62. Further, the resin reservoir 62 and the resin flow path 63 protrude downward from the lower surface 64 of the upper mold 61 and can be fitted into the notch guide portion 65 so as to contact the surface of the core piece in the notch guide portion 65. It has become. Note that FIG. 8B also has a similar structure.

Further, the radially inner contour shape of the protruding portion 66 of the resin reservoir 62 shown in FIG. 8A is similar to the radially inner contour shape of the notch guide portion 65.
The outer contour shape of the protruding portion 68 of the resin reservoir 67 shown in FIG. 8B is a U-shape similar to the radially inner contour shape of the notch guide portion 65, and the thickness thereof is Thick and strong.
Thereby, it can prevent that the resin member 14 in the notch guide part 65 protrudes on the surface of the rotor lamination | stacking iron core 60. FIG.

A resin sealing method for a rotor laminated core according to the seventh embodiment of the present invention will be described with reference to FIGS. 10 (A) and 10 (B).
As shown in FIG. 10A, the resin sealing portion 11 of the rotor laminated core 70 is in the radial direction outside of the resin reservoir portion 13 of the upper mold (an example of a mold) 71 in a plan view. The sealing part 11 and the resin reservoir part 13 are in different positions. Only the resin reservoir 13 is formed in the upper die 71, and the guide portions are cut out in the core pieces 72 and 73 (a plurality of pieces from above: three in this case) of the rotor laminated core 70 on the side where the upper die 71 contacts. 74 is formed.
Here, an iron core piece (also referred to as a lid core) 72 located on the side in contact with the upper die 71 in a plan view, that is, the uppermost stage of the rotor laminated iron core 70 covers a part of the notch guide portion 74. This covering place is all above the resin sealing portion 11, but may be a part as long as the permanent magnet 18 can be prevented from protruding from the resin sealing portion 11.
By the above method, it is possible to manufacture a rotor laminated core capable of simplifying and further eliminating the work of removing the cured resin member attached to the surface of the rotor laminated core.

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included. For example, the case where the resin sealing method for a rotor laminated core of the present invention is configured by combining some or all of the above-described embodiments and modifications is also included in the scope of the right of the present invention.
In the above embodiment, the case where the mold having the resin reservoir portion is used as the upper mold or the lower mold has been described. However, the mold can be attached to and detached from the lower part of the upper mold or the upper part of the lower mold. It may be provided. This facilitates the replacement work of the mold accompanying the wear of the mold, and is economical because it is not necessary to replace the entire upper mold or the lower mold.

(A), (B) is explanatory drawing of the resin sealing method of the rotor lamination | stacking iron core which concerns on the 1st Embodiment of this invention, respectively, and explanatory drawing of the state which removed the resin member hardened | cured after resin sealing . It is explanatory drawing of the resin sealing apparatus used with the resin sealing method of the same rotor lamination | stacking iron core. It is explanatory drawing of the other resin sealing apparatus used with the resin sealing method of the same rotor lamination | stacking iron core. (A) is a top view of the rotor lamination | stacking iron core which uses the resin sealing method of the same rotor lamination | stacking iron core, (B) is a top view of the rotor lamination | stacking iron core which concerns on a modification. (A), (B) is each explanatory drawing of the resin sealing method of the rotor lamination | stacking iron core which concerns on the 2nd Embodiment of this invention, and explanatory drawing of the state which removed the resin member hardened | cured after resin sealing. . (A), (B) is explanatory drawing of the resin sealing method of the rotor lamination | stacking iron core which concerns on the 3rd Embodiment of this invention, respectively, and explanatory drawing of the state which removed the upper mold | type after resin sealing. (A), (B) is the top view of the rotor lamination | stacking core which uses the resin sealing method of the rotor lamination | stacking iron core which concerns on the 4th Embodiment of this invention, respectively, The resin sealing method of the same rotor lamination | stacking iron core It is explanatory drawing of. (A), (B) is a partial top view of the rotor lamination | stacking iron core which uses the resin sealing method of the rotor lamination | stacking iron core which concerns on the 5th, 6th embodiment of this invention, respectively. (A), (B) is each XX arrow sectional drawing and YY arrow sectional drawing of FIG. 8 (A). (A), (B) is the top view of the rotor lamination | stacking iron core which uses the resin sealing method of the rotor lamination | stacking iron core which concerns on the 7th Embodiment of this invention, respectively, The resin sealing method of the same rotor lamination | stacking iron core It is explanatory drawing of. (A) is a side sectional view showing a state after resin sealing of a rotor laminated core according to a conventional example, (B) is a side sectional view of a rotor laminated core with a resin member remaining on the surface, and (C) is a surface. It is a fragmentary top view of the rotor lamination | stacking iron core in which the resin member remains in.

10: Rotor laminated iron core, 11: Resin sealing part, 12: Upper mold (mold), 13: Resin reservoir part, 14: Resin member, 15: Iron core piece, 16: Notch guide part, 17: Shaft hole , 18: permanent magnet, 19: resin sealing device, 20: lower mold, 21: plunger, 22: resin flow path, 23: upper mold, 24: lower mold (mold), 25: resin sealing apparatus, 26 : Resin channel, 27: Non-rotating, 28: Protruding part, 29: Resin member, 30: Rotor laminated iron core, 31: Upper mold (mold), 32: Iron core piece, 33: Resin channel, 34: Cut Notch guide part, 35: Protruding part, 36: Resin member, 40: Rotor laminated iron core, 41: Upper die (die), 42: Notch guide part, 43: Radial inner side surface, 44: Inner surface, 45: Lower surface, 50: Rotor laminated iron core, 51: Upper die (die), 52: Notch guide part, 53: Lower surface, 60: Rotor laminated iron 61: Upper mold (mold), 62: Resin reservoir, 63: Resin flow path, 64: Lower surface, 65: Notch guide, 66: Protruding part, 67: Resin reservoir, 68: Protruding part, 70 : Rotor laminated iron core, 71: Upper die (die), 72, 73: Iron core piece, 74: Notch guide part

Claims (2)

In the resin sealing method of the rotor laminated core, in which the resin member is filled from the resin reservoir formed in the mold in contact with the rotor laminated iron core in the resin sealed portion of the rotor laminated iron core,
The resin reservoir extends to an end of the mold that contacts the rotor laminated core, and is cut to communicate with the resin sealing part on the core piece of the rotor laminated core on the side in contact with the mold. A notch guide portion is formed, and the resin member is filled from the resin reservoir portion to the resin sealing portion via the notch guide portion, and the protrusion is formed in the die in the notch guide portion. A resin sealing method for a rotor laminated core, wherein a recess is formed on the surface of the resin member of the notch guide portion that has been inserted and cured . In the resin sealing method of the rotor laminated core, in which the resin member is filled from the resin reservoir formed in the mold in contact with the rotor laminated iron core in the resin sealed portion of the rotor laminated iron core,
The resin reservoir extends to an end of the mold that contacts the rotor laminated core, and is cut to communicate with the resin sealing part on the core piece of the rotor laminated core on the side in contact with the mold. A notch guide portion is formed, and the resin member is filled from the resin reservoir portion into the resin sealing portion via the notch guide portion, and the resin member of the resin reservoir portion is disposed in the notch guide portion. A resin sealing method for a rotor laminated iron core, wherein a concave portion is formed on the surface of the cured resin member of the notch guide portion by inserting a plunger that pushes out the core.

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