JP7172051B2 - Rotor core manufacturing equipment - Google Patents

Description

The present invention relates to a rotor core manufacturing apparatus for an embedded magnet motor.

The rotor core of the magnet-embedded motor is constructed by laminating a plurality of steel plates. and a magnet fixed to the core body through the magnet.

In the manufacture of such rotor cores, there is known a molding device that fixes the magnets to the core body by filling the magnet housing holes with a thermosetting resin material and thermosetting the resin material (see, for example, Patent Document 1). ). The molding apparatus described in Document 1 includes a fixed lower mold and a movable upper mold, and a cull plate having a resin injection port is provided between the upper mold and the core body. there is

With the core body sandwiched between the lower mold and the cull plate and the upper mold placed on the upper surface of the cull plate, the resin material flows from the gate provided on the upper mold into the magnet housing hole through the resin injection port of the cull plate. be filled. Then, by heating the upper mold and the lower mold to thermoset the resin material, the magnet is fixed to the core body via the resin material.

JP 2014-91220 A

By the way, when the upper mold is raised to open the mold after the resin material is thermally cured by the molding device, the residual resin material, oil, etc. between the gate of the upper mold and the resin injection port of the cull plate may cause If the cull plate comes into close contact with the upper die, the cull plate may rise together with the upper die. In this case, the cull plate may drop onto the core body while it is ascending, resulting in deformation of the core body. There is a problem that the core body interferes with the cull plate that is in close contact with the upper die.

SUMMARY OF THE INVENTION An object of the present invention is to provide a rotor core manufacturing apparatus capable of suppressing close contact between a movable mold and a cull plate when the mold is opened.

A rotor core manufacturing apparatus for achieving the above object comprises: a stationary die on which a core body having a center hole and a plurality of magnet housing holes is placed; a cull plate placed on the upper surface of the core body; a movable mold arranged on an upper surface of a plate and provided to be able to come into contact with and separate from the fixed mold; A rotor core is manufactured by filling a resin material into each of the magnet housing holes in which the magnets are housed and fixing the magnets to the core body. and a pressing member for pressing the other when the mold is opened.

According to this configuration, when the molds are opened, the pressing member provided on at least one of the movable mold and the cull plate presses the other, so the cull plate is easily separated from the movable mold. Therefore, it is possible to prevent the movable mold and the cull plate from coming into close contact with each other when the mold is opened.

According to the present invention, it is possible to suppress close contact between the movable mold and the cull plate when the mold is opened.

FIG. 2 is a perspective view showing a rotor core manufactured by a rotor core manufacturing apparatus according to an embodiment; FIG. 4 is a longitudinal sectional view showing the rotor core of the same embodiment; FIG. 4 is a vertical cross-sectional view showing the rotor core manufacturing apparatus of the same embodiment together with the rotor core. FIG. 4 is an enlarged cross-sectional view centering on the movable die of the rotor core manufacturing apparatus of the same embodiment, in which (a) is a cross-sectional view showing a state in which the movable die is close to the cull plate, and (b) is a movable FIG. 5C is a cross-sectional view showing a state in which the mold is in contact with the cull plate, and (c) is a cross-sectional view showing a state in which the movable mold is separated from the cull plate; FIG. 11 is an enlarged cross-sectional view of a rotor core manufacturing apparatus of a modified example, centering on a movable mold;

An embodiment of a rotor core manufacturing apparatus will be described below with reference to FIGS. 1 to 4. FIG.
First, referring to FIGS. 1 and 2, a rotor core 10 manufactured by a low-core manufacturing apparatus (hereinafter referred to as a manufacturing apparatus) according to the present embodiment will be described.

As shown in FIGS. 1 and 2, the rotor core 10 includes a core body 11 made of a laminated body in which a plurality of iron core pieces 12 made of electromagnetic steel sheets are laminated.
The core body 11 has a central hole 11a and a plurality of magnet receiving holes 13 which are positioned on the outer peripheral side of the central hole 11a and which are spaced apart from each other in the circumferential direction. The center hole 11a and the magnet housing holes 13 pass through the core body 11 along the axial direction (vertical direction in FIGS. 1 and 2).

As shown in FIG. 1, a pair of key portions 11b that face each other in the radial direction of the core body 11 protrude from the inner peripheral surface of the center hole 11a.
As shown in FIG. 2 , a plate-like magnet 14 extending along the axis C of the core body 11 is inserted into each magnet housing hole 13 . The inside of each magnet housing hole 13 is filled with a resin material 16 for fixing the magnets 14 . A thermosetting resin such as an epoxy resin is preferably used as the resin material 16 .

As shown in FIGS. 1 and 2, a plurality of cooling holes 15 through which a cooling medium for cooling the magnets 14 flows are formed in the core body 11 on the inner peripheral side of the magnet housing holes 13 in the circumferential direction. They are spaced apart from each other. Each cooling hole 15 has an arcuate shape curved along the circumferential direction of the core body 11 and is provided between a pair of magnet housing holes 13 adjacent to each other in the circumferential direction. Each cooling hole 15 penetrates the core body 11 along the axial direction. Further, each cooling hole 15 has a communicating portion (not shown) that branches inside the core body 11 and communicates with the central hole 11a.

Note that the core body 11 of the present embodiment is composed of a plurality of blocks in which a plurality of iron core pieces 12 are laminated. The core pieces 12 constituting each block are provided with well-known joints (not shown) that protrude toward one side of the stacking direction (axial direction) by so-called doweling. are connected to each other by caulking due to the uneven relationship between the connecting portions. One end of each block also includes a dummy core piece 12 having a hole (not shown) punched out by the joint. For this reason, the dummy core piece 12 is connected to the core piece 12 that constitutes the same block as the dummy core piece 12 among the pair of adjacent core pieces 12 , while the dummy core piece 12 is connected to the dummy core piece 12 . It is not connected to the core piece 12 that constitutes another block. Therefore, each block constituting the core body 11 is separated from each other in a state in which the resin material 16 is not provided inside each magnet housing hole 13 .

Next, each configuration of the manufacturing apparatus will be described.
As shown in FIG. 3 , the manufacturing apparatus includes a fixed mold 20 , a cull plate 50 , and a movable mold 60 that is attached to and away from the fixed mold 20 .

<Fixed type 20>
The fixed mold 20 includes a mold main body 21 , a support member 30 fixed to the upper surface of the mold main body 21 , and a spacer 40 arranged on the upper surface of the support member 30 .

As shown in FIG. 3, the support member 30 includes a rectangular plate-shaped base portion 31 fixed to the upper surface of the fixed die 20 by bolts (not shown), and a core body 11 protruding from the central portion of the base portion 31 . and a cylindrical post portion 32 to be inserted into the center hole 11a.

A pair of key groove portions (not shown) into which the key portions 11b of the core body 11 are inserted are provided along the axial direction on the outer peripheral surface of the post portion 32 . By inserting the key portion 11b of the core body 11 into the key groove portion of the post portion 32, the phase of the core body 11 with respect to the support member 30, more specifically, the phase of each block constituting the core body 11 is determined.

A substantially rectangular plate-like spacer 40 having an outer shape smaller than that of the base portion 31 is provided on the base portion 31 of the support member 30 . The spacer 40 is provided with a substantially circular through hole 40a centered on the axis C in plan view. A pair of regulating projections (not shown) that position the spacer 40 with respect to the support member 30 by being inserted into the pair of key groove portions of the support member 30 are provided on the inner peripheral surface of the through hole 40a. Note that the lower surface 11c of the core body 11 abuts against the upper surface 40c of the spacer 40 while the support member 30 is inserted into the spacer 40 .

Insertion holes 40 b are provided in the spacer 40 at positions corresponding to the magnet accommodation holes 13 of the core body 11 . A regulation pin 41 is inserted from below and fixed to each insertion hole 40b. A protrusion 41 a that protrudes upward from the upper surface 40 c of the spacer 40 is provided at the upper end of each regulating pin 41 . The protruding portion 41 a of each regulating pin 41 is positioned inside each magnet housing hole 13 . Therefore, in each magnet housing hole 13 , the lower surface of each magnet 14 is brought into contact with the projecting portion 41 a of each regulating pin 41 above the lower surface 11 c of the core body 11 . This restricts the downward displacement of the magnet 14 and positions the magnet 14 in the axial direction.

<Culplate 50>
A rectangular cull plate 50 is placed on the top surface 11 d of the core body 11 . The lower surface 50a of the cull plate 50 is in contact with the upper surface 11d of the core body 11. As shown in FIG.

A plurality of filling pots 51 for filling the resin material 16 into the magnet housing holes 13 of the core body 11 are provided in the cull plate 50 at intervals in the circumferential direction. Each filling pot 51 is provided for each pair of magnet housing holes 13 in a portion between a pair of magnet housing holes 13 adjacent to each other in the circumferential direction. Each filling pot 51 communicates with a connecting portion 51a having a circular shape in a plan view and opening on the upper surface 50b, and the connecting portion 51a, which passes through the cull plate 50 in the thickness direction and communicates with the pair of magnet housing holes 13. and a pair of nozzle portions 51b.

<Movable type 60>
The movable mold 60 includes a mold body 65 and a plate portion 61 fixed to the bottom surface of the mold body 65 and in contact with the top surface 50 b of the cull plate 50 . The plate portion 61 has a larger outer shape than the cull plate 50 .

In the central portion of the plate portion 61, an accommodating portion 62 having a circular cross section is provided that penetrates the plate portion 61 in the thickness direction. The accommodation portion 62 includes a first accommodation portion 63 that opens to the lower surface of the plate portion 61 and a second accommodation portion 64 that opens to the upper surface of the plate portion 61 and has a larger diameter than the first accommodation portion 63 .

A plurality of first resin supply passages 61a connected to the connection portions 51a are provided in portions of the plate portion 61 corresponding to the connection portions 51a of the filling pots 51. As shown in FIG.
A through hole 66 having a circular cross-section is provided in the mold body 65 directly above the accommodating portion 62 . The inner diameter of the through hole 66 is larger than the inner diameter of the second accommodating portion 64 of the accommodating portion 62 . The mold main body 65 is provided with a plurality of second resin supply passages 65a communicating with the first resin supply passages 61a of the plate portion 61 .

<Pressing member 70>
A cylindrical pressing member 70 that is biased toward the cull plate 50 by a compression coil spring 73 is provided inside the accommodating portion 62 of the plate portion 61 . The pressing member 70 includes a push-out portion 71 inserted into the first housing portion 63 and an enlarged diameter portion 72 having a larger diameter than the push-out portion 71 at the upper end of the push-out portion 71 . Here, as shown in FIGS. 3 and 4, the length of the extrusion portion 71 in the axial direction is longer than the length of the first accommodation portion 63 . Therefore, when the movable mold 60 and the cull plate 50 are not in contact with each other, the tip of the pushing portion 71 protrudes from the lower surface of the plate portion 61 due to the biasing force of the compression coil spring 73 .

A fixing portion 74 for fixing the upper end of the compression coil spring 73 is provided inside the through hole 66 of the mold body 65 . Note that the lower end of the compression coil spring 73 is in contact with the upper surface of the expanded diameter portion 72 .

Next, a procedure for fixing the magnet 14 to the core body 11 using the manufacturing apparatus of this embodiment will be described.
First, after placing the core body 11 on the upper surface 40 c of the spacer 40 of the fixed mold 20 , the magnet 14 is inserted into the magnet housing hole 13 of the core body 11 .

Next, as shown in FIG. 4A, the cull plate 50 is placed on the upper surface 11d of the core body 11. Next, as shown in FIG.
Next, the movable die 60 is displaced toward the cull plate 50 as shown in FIG. 4(b). At this time, the push-out portion 71 projecting from the lower surface of the plate portion 61 is brought into contact with the upper surface 50 b of the cull plate 50 , so that the pressing member 70 resists the biasing force of the compression coil spring 73 and pushes the plate portion 61 . It is immersed in the housing portion 62 .

Next, the resin material 16 is supplied to the second resin supply passage 65 a of the mold body 65 . The resin material 16 is filled into the magnet housing holes 13 of the core body 11 via the first resin supply passage 61 a and the filling pot 51 . In addition, illustration of the resin material 16 is omitted in the figure.

Next, the magnet 14 is fixed to the core body 11 by heating the entire manufacturing apparatus with a heating device to thermally cure the thermosetting resin material 16 .
The operation of this embodiment will be described.

In the manufacturing apparatus of this embodiment, after the magnet 14 is fixed to the core body 11 , mold opening is performed to separate the movable mold 60 from the core body 11 . At this time, the pressing member 70 urged toward the cull plate 50 by the compression coil spring 73 presses the upper surface 50b of the cull plate 50, as shown in FIG. 4(c). Therefore, the cull plate 50 can be easily separated from the movable mold 60 .

Effects of the present embodiment will be described.
(1) The rotor core manufacturing apparatus includes a fixed die 20 on which a core body 11 having a center hole 11a and a plurality of magnet housing holes 13 is placed, a cull plate 50 placed on the upper surface 11d of the core body 11, A movable mold 60 is arranged on the upper surface 50b of the cull plate 50 and is provided to be able to come into contact with and separate from the fixed mold 20 . A housing portion 62 for housing the pressing member 70 so as to be retractable from the bottom surface is open in the lower surface of the movable mold 60 , and the pressing member 70 is biased toward the cull plate 50 inside the housing portion 62 . A compression coil spring 73 is provided as a biasing member.

With such a configuration, the cull plate 50 can be easily separated from the movable mold 60 because of the effects described above. Therefore, it is possible to prevent the movable mold 60 and the cull plate 50 from coming into close contact with each other when the mold is opened.

(2) The biasing member is the compression coil spring 73 .
With such a configuration, the biasing member according to the present embodiment can be embodied with a simple configuration. Also, in this case, the biasing force applied to the pressing member 70 is changed by changing the type of compression coil spring. Therefore, the pressing force of the pressing member 70 can be adjusted by a simple method.

This embodiment can be implemented with the following modifications. This embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
- As shown in FIG. 5 , a plurality of pressing members 170 may be provided at intervals in the circumferential direction about the central axis of the supporting member 30 .

In this case, the cull plate 50 is pressed over a wide range by the plurality of pressing members 170 . Therefore, the cull plate 50 can be separated from the movable mold 160 more easily. Therefore, it is possible to further suppress close contact between the movable mold and the cull plate when the mold is opened.

In addition, in the modified example shown in FIG. 5, the same reference numerals are assigned to the same configurations as in the above-described embodiment, and the corresponding configurations are indicated by adding "100" to omit redundant description. is doing.

- The biasing member is not limited to a compression coil spring. For example, a gas spring or the like may be used as long as it has an elastic force.
- The pressing member can also be provided on the cull plate side. In this case, when the mold is opened, the cull plate is easily separated from the movable mold due to the reaction force of the pressing force of the pressing member pressing the movable mold.

- The pressing member can be provided on both the movable mold and the cull plate. In this case, the close contact between the movable die and the cull plate can be further suppressed.

DESCRIPTION OF SYMBOLS 10... Rotor core 11... Core main body 11a... Center hole 11b... Key part 11c... Lower surface 11d... Upper surface 12... Iron core piece 13... Magnet accommodation hole 14... Magnet 15... Cooling hole 16... Resin Material 20 Fixed mold 21 Mold main body 30 Supporting member 31 Base part 32 Post part 40 Spacer 40a Through hole 40b Insertion hole 40c Upper surface 41 Regulating pin 41a... Protruding part 50... Cull plate 50a... Contact surface 50b... Upper surface 51... Filling pot 51a... Connection part 51b... Nozzle part 60, 160... Movable type 61, 161... Plate part 61a 1st resin supply passage 62, 162 accommodating portion 63 first accommodating portion 64 second accommodating portion 65, 165 mold main body 65a second resin supply passage 66 through hole 70, Reference numerals 170: pressing member, 71: pushing portion, 72: enlarged diameter portion, 73, 173: compression coil spring, 74, 174: fixing portion.

Claims (3)

a stationary die on which a core body having a center hole and a plurality of magnet housing holes is mounted;
a cull plate placed on the upper surface of the core body;
a movable mold disposed on the upper surface of the cull plate and provided to be able to come into contact with and separate from the fixed mold;
The magnets are fixed to the core body by filling a resin material into each of the magnet housing holes in which the magnets are housed through a resin injection port provided in the gate provided in the movable mold and the cull plate. In an apparatus for manufacturing a rotor core by
The movable mold is provided with a pressing member that separates the cull plate from the movable mold by pressing the cull plate when the mold is opened,
The lower surface of the movable mold has an opening that accommodates the pressing member so as to be retractable from the lower surface,
A biasing member that biases the pressing member toward the cull plate is provided inside the accommodating portion.
Rotor core manufacturing equipment. The biasing member is a compression coil spring,
The apparatus for manufacturing a rotor core according to claim 1. The fixed mold includes a post portion inserted into the center hole of the core body,
A plurality of the pressing members are provided at intervals in a circumferential direction around the central axis of the post,
3. The apparatus for manufacturing a rotor core according to claim 1 or 2.

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