JP5446850B2 - Stator core manufacturing equipment - Google Patents

Description

  The present invention relates to a stator core for manufacturing a stator core by fitting a heat-expanded shrink-fit ring to the outer periphery of a split core assembly assembled by a plurality of split cores, and cooling and shrinking the shrink-fit ring. The present invention relates to a stator core manufacturing apparatus used in a manufacturing method.

FIG. 10 shows a cross-sectional perspective view of the stator core 50.
As shown in FIG. 10, the shrink-fitting ring 19 fitted into the outer periphery of the stator core 50 has a hollow cylindrical shape, and a cylindrical portion 26 and a flange portion 24 are formed. The flange portion 24 is formed at the end of the cylindrical portion 26. Mounting portions 20 are formed at three locations around the flange portion 24. A positioning hole 21 is formed in the mounting portion 20. The diameter H of the positioning hole 21 is Φ9 ± 0.1 mm. A split core assembly 10 formed by collecting 18 split cores 10 </ b> A to 10 </ b> R is fitted into the inner periphery of the shrink-fit ring 19.

Conventionally, there is a stator core manufacturing apparatus 100 having a ring mounting pin 110 as shown in FIG. 11 as an apparatus for positioning the shrink-fitted ring 19 that is heated and expanded on the outer periphery of the split core assembly 10. The diameter P of the cylindrical ring mounting pin 110 is 7 mm. FIG. 11 shows a cross-sectional view of the stator core manufacturing apparatus 100. In FIG. 11, a mounting table on which the shrink-fitting ring 19 is mounted from below is omitted. FIG. 12 shows a partially enlarged view of broken line Y in FIG.
As shown in FIG. 12, the stator core manufacturing apparatus 100 attaches a ring mounting pin 110 having a diameter PΦ of 7 mm to a diameter HΦ9 ± 0.1 mm of the positioning hole 21 of the shrink fitting ring 19, and in the state shown in FIG. The fitting ring 19 is heated and expanded by the band heater 22. Although not shown, in a heated state, the shrink-fitting ring 19 is fitted into the split core assembly 10 to obtain the stator core 50 shown in FIG.

JP 09-322493 A JP2003-301221A JP 2000-096131 A

However, the conventional stator core manufacturing apparatus 100 has the following problems.
The shrink-fit ring 19 expands when heated, but since the heating is uneven, unevenness occurs in the expansion direction of the shrink-fit ring 19. As shown in FIG. 8, which is a DD cross-sectional view of FIG. 11, if there is unevenness in the expansion direction, when the shrink-fit ring 19 is fitted into the split core assembly 10, the shrink-fit ring 19 and the split core are circumferentially inserted. A phase shift from the assembly 10 occurs. If a phase shift in the circumferential direction occurs, there is no effect on the final product motor. However, in the next process of caulking and connecting U, V, and W terminals that are wired outside the stator core 50, a circumferential phase shift causes a defective insertion state during caulking, which is a problem. .
In particular, as shown in FIGS. 9 and 12, between the diameter PΦ7 mm of the ring mounting pin 110 of the stator core manufacturing apparatus 100 and the diameter HΦ9 ± 0.1 mm of the positioning hole 21 of the shrink fitting ring 19, Φ2 mm, one side A clearance 120 of 1 mm is created. The clearance 120 between the ring mounting pin 110 and the positioning hole 21 poses a problem when the shrink-fitted ring 19 is expanded, expanding in the circumferential direction and generating a phase shift of 0.5 mm in the circumferential direction.

Further, since the ring mounting pin 110 is a fixed type, there is a problem that when the shrink-fitted ring 19 is expanded during heating, it is not possible to control which direction of the clearance 120 is expanded, and the expansion direction cannot be adjusted. It was.
On the other hand, if the clearance 120 is not provided in the ring mounting pin 110 and the positioning hole 21, the shrink fitting ring 110 cannot be expanded, and the shrink fitting ring 19 cannot be attached to the outer periphery of the split core assembly 10. .

  Therefore, the present invention has been made to solve the above-described problems, and the purpose of the present invention is to prevent split core assembly from causing circumferential phase shift when the shrink fit ring is expanded. It aims at providing the stator core manufacturing apparatus which can be attached to outer periphery.

In order to achieve the above object, a stator core manufacturing apparatus according to an aspect of the present invention has the following configuration.
(1) Stator core manufacture that manufactures a stator core by fitting a shrink-fitted ring that is heated and expanded to the outer periphery of a split core assembly that is assembled by a plurality of split cores, and the shrink-fitted ring is cooled and contracted. in the stator core manufacturing apparatus used in the method, an inner Osamu Shu for pressing the inner periphery of the split core assembly outwardly by an outer peripheral jig for pressing the outer periphery of the split core assembly inward, the split core assembly Positioning means for positioning, a movable mounting table for mounting the mounting portion of the shrink-fit ring, a ring mounting pin that fits into a positioning hole formed in the mounting portion, and the ring mounting pin in the radial direction only to have a ring regulating means having a guide portion to be movable, after the ring mounting pin is fitted with the positioning hole, the mounting table is the baked fitting ring Moving the serial mounting portion from a lower to a position capable of supporting, and is characterized in.
(2) In the stator core manufacturing apparatus described in (1), the ring mounting pin can be moved only in the radial direction by being fitted into the oval fitting hole of the ring restricting means. It is characterized by this.
(3) In the stator core manufacturing apparatus described in (1), the guide portion guides the mounting pin so that the mounting pin can be moved only in a radial direction by inserting a plurality of guide bars into the mounting pin. It is characterized by that.

The operation and effect of the stator core will be described.
(1) A stator core manufacturing method for manufacturing a stator core by fitting a heat-expanded shrink-fit ring on the outer periphery of a split core assembly assembled by a plurality of split cores, and cooling and shrinking the shrink-fit ring. in the stator core manufacturing apparatus used for the Osamu Shu for pressing the inner periphery of the split core assembly outwardly by an outer peripheral jig for pressing the outer periphery of the split core assembly inward, positioning means for positioning the split core assembly A movable mounting table for mounting the mounting portion of the shrink fitting ring, a ring mounting pin that fits into a positioning hole formed in the mounting portion, and a guide means that can move the ring mounting pin only in the radial direction, to have a ring regulating means having, after ring mounting pin is fitted with the positioning holes, moving the child a mounting portion of the ring shrink fit mounting table to a position that can be supported from below By, the shrink fitting ring to move only in the radial direction, the phase shift between the split core assembly and shrink fitting ring in the circumferential direction is reduced. When moving in the radial direction, even when the shrink-fit ring is cooled and contracted, it moves only in the radial direction, so there is no phase shift in the circumferential direction, and U, V, W wired outside the stator core. In the next process of caulking and connecting the terminals, there is little occurrence of a poor insertion state when caulking.
(2) In the stator core manufacturing apparatus described in (1), the ring mounting pin can be moved only in the radial direction by being fitted into the oval fitting hole of the ring regulating means. Since the fitting hole has no clearance in the circumferential direction, it does not expand in the circumferential direction even when the shrink-fit ring is heated and expanded. Further, even when contracted, it does not contract in the circumferential direction.
Therefore, since the circumferential phase shift does not occur, the shrink fitting ring can be attached to the outer periphery of the split core assembly.
(3) In the stator core manufacturing apparatus described in (1), the guide portion guides the ring mounting pin so as to be movable only in the radial direction by inserting a plurality of guide rods into the mounting pin. Therefore, even if there is a clearance between the ring mounting pin and the fitting hole, the ring mounting pin can be translated because it is guided by the guide rod.

It is sectional drawing of the stator core manufacturing apparatus (1) which concerns on the present Example 1 of this invention. It is sectional drawing of the stator core manufacturing apparatus (2) which concerns on the present Example 1 of this invention. It is an enlarged view of the broken line X of FIG. 1 which concerns on the present Example 1 of this invention. It is BB sectional drawing of FIG. 3 which concerns on the present Example 1 of this invention. It is AA sectional drawing of the ring control apparatus of FIG. 1 which concerns on the present Example 1 of this invention. It is the bar graph which showed the phase shift of the circumferential direction which concerns on the present Example 1 of this invention. It is a top view which shows the principal part of the positioning device which concerns on the present Example 1 of this invention. It is a top view of the stator core which concerns on a prior art. It is an enlarged view of the broken line Z of FIG. 8 which concerns on a prior art. It is an external appearance perspective view of a stator core. It is sectional drawing of the stator core manufacturing apparatus which concerns on a prior art. It is an enlarged view of the broken line Y of FIG. 11 which concerns on a prior art. It is a partially expanded view of the stator core manufacturing apparatus according to the second embodiment of the present invention.

Next, an embodiment of a stator core manufacturing apparatus according to the present invention will be described with reference to the drawings.
(First embodiment)
<Overall configuration of stator core>
FIG. 10 shows a cross-sectional perspective view of the stator core 50.
As shown in FIG. 10, the shrink-fitting ring 19 fitted into the outer periphery of the stator core 50 has a hollow cylindrical shape, and a cylindrical portion 26 and a flange portion 24 are formed. The diameter of the inner periphery of the cylindrical portion 26 is Φ200 mm at room temperature. The diameter of the inner circumference of the cylindrical portion 26 is thermally expanded when heated to 350 ° C. by the band heater 22 and becomes Φ200.8 mm. The flange portion 24 is formed at the end of the cylindrical portion 26. Mounting portions 20 are formed at three locations around the flange portion 24. A positioning hole 21 is formed in the mounting portion 20. The diameter H of the positioning hole 21 is Φ9 ± 0.1 mm. A split core assembly 10 formed by collecting 18 split cores 10 </ b> A to 10 </ b> R is fitted into the inner periphery of the shrink-fit ring 19.

<Overall configuration of stator core manufacturing apparatus>
In FIG. 1, sectional drawing of the stator core manufacturing apparatus 1 (1) is shown. In FIG. 2, sectional drawing of the stator core manufacturing apparatus 1 (2) is shown. FIG. 3 shows an enlarged view of a broken line X portion of the stator core manufacturing apparatus 1 shown in FIG. FIG. 4 shows a BB cross-sectional view of FIG. FIG. 5 shows a cross-sectional view of the ring regulating device 3 of FIG.
As shown in FIG. 1, the stator core manufacturing apparatus 1 includes a ring regulating device 3 and a positioning device 2.

The ring regulating device 3 will be described.
As shown in FIG. 1, the ring restriction device 3 includes a main body 30 and a ring positioning part 31.
The main body 30 has vertical movement means (not shown). The main body 30 has a circular hole (not shown). Therefore, as shown in FIG. 2, when the main body 30 is lowered, a part of the positioning device 2 is inserted through the hole of the main body 30.
As shown in FIG. 1, the ring positioning portion 31 is fixed to the lower end of the main body portion 30. Of the ring positioning part 31, a part connected to the main body part 30 is a main body connection part 32. As shown in FIG. 5, the main body connection portion 32 has a hollow cylindrical shape. The main body connection portion 32 is formed with three ring holding portions 33 at positions corresponding to the attachment portions 20 of the shrink fitting ring 19. The ring holding part 33 holds the shrink-fitting ring 19.

As shown in FIG. 1, the ring holding portion 33 includes a pin guide portion 35, a ring mounting pin 37, a rod 38, a mounting table 39, and a cylinder 40.
A cylinder 40 is provided at the outer peripheral end of the main body connection portion 32 opposite to the portion connected to the main body portion 30. The cylinder 40 has a rod 38. The rod 38 is attached so as to be slidable in the horizontal direction and in the radial direction with respect to the main body connection portion 32. A mounting table 39 for mounting the shrink fitting ring 19 is attached to the tip of the rod 38.
In the present embodiment, the cylinder 40 uses an air cylinder, but it may be a mechanism that is slidable in the horizontal direction and in the radial direction.

As shown in FIG. 1, a pin guide portion 35 is formed at an intermediate portion of the main body connection portion 32. As shown in FIG. 3 , the pin guide portion 35 is formed with a hollow cylindrical hole 351. As shown in FIG. 4, the cylindrical hole 351 has an oval shape when viewed from the upper cross section. The oval shape of the cylindrical hole 351 includes a pair of arcs 351a and a pair of parallel wall surfaces 351b. The interval G between the wall surfaces 351b is the diameter E + 0.1 mm of the ring mounting pin 37 shown in FIG. 3, and there is almost no clearance. A guide rod 36 for guiding the mounting pin 37 is attached between the arcs 351a. As shown in FIG. 3, two guide rods 36 are attached in parallel in the cylindrical hole 351.

A cylindrical ring attachment pin 37 is slidably attached to the cylindrical hole 351 of the pin guide portion 35 with two guide rods. Of the ring mounting pin 37, a mounting pin tip 371 having a tapered shape is formed at the lowermost end in the figure. In addition, a cylindrical fitting portion 372 is formed on the upper portion of the attachment pin tip portion 371 having a tapered shape. The fitting portion 372 is fitted with the positioning hole 21 of the shrink fitting ring 19. The diameter E of the fitting portion 372 is Φ9 to 8.9 mm. The diameter of the positioning hole 21 shown in FIG. 3 is the same as the diameter H shown in FIG. The diameter E and the diameter H are adjusted so that a small clearance of about 0.1 mm is formed in the diameter H when the fitting portion 372 is fitted in the positioning hole 21.
A ball plunger 34 is attached to the fitting portion 372 so as to be biased outward by a spring.

  A hollow cylindrical guide circular hole 373 is formed at the upper end of the ring mounting pin 37 so as to pass through the center line of the ring mounting pin 36. In this embodiment, two guide circular holes 373 are formed in parallel. A guide rod 36 is inserted into the guide circular hole 373. A ball bearing (not shown) is attached in the guide circular hole 373 so that the guide rod 36 can move smoothly. The diameter E of the upper part 375 of the portion where the guide circular hole 373 is formed in the ring mounting pin 37 is a difference of about 0.1 mm from the interval G of the wall surface 351b shown in FIG. Therefore, since there is almost no clearance in the circumferential direction, the ring mounting pin 37 cannot move in the circumferential direction and can move only in a radial direction with a space. Furthermore, since the ring mounting pin 37 is guided by the guide rod 36, it can only move in the radial direction. Therefore, the ring mounting pin 37 moves only in the radial direction.

The positioning device 2 will be described.
Split core assembly 10 is mounting tower at a predetermined position in the positioning device 2. The split core assembly 10 includes a split core and a resin mold.
In the state of FIG. 1, the inner peripheral collet 11 is in contact with the inner peripheral surface of the split core assembly 10. The inner peripheral collet 11 is held by a slide guide 17 so as to be slidable in a direction in which the inner core collet 11 contacts or separates from the split core assembly 10. In the state of FIG. 1, the outer peripheral surface of the split core assembly 10 is in contact with the inner peripheral surface of the outer peripheral collet 12. The tapered surface 12a of the outer peripheral collet 12 is slidably held along the tapered surface 16a of the slide guide 16.

FIG. 7 is a plan view showing the positional relationship among the split core assembly 10, the inner peripheral collet 11, the outer peripheral collet 12, and the slide guide 16. As shown in FIG. As shown in FIG. 7 , the divided core assembly 10 includes one divided core assembly 10 including divided cores 10A, 10B,... 10R and 18 divided cores. The inner peripheral collet 11A is in contact with the inner peripheral surface of the split core 10A. The outer peripheral collet 12A is in contact with the outer peripheral surface of the split core 10A.
On the inner peripheral surface of the inner peripheral collet 11, a tapered surface 11a is formed in a direction in which the inner diameter becomes smaller toward the lower side. A diameter-expanded portion 13 a that is a tapered surface of the rod 13 is in contact with the tapered surface 11 a of the inner peripheral collet 11. The direction of the tapered surface of the enlarged diameter portion 13a is opposite to the tapered surface 11a. The rod 13 is held by the apparatus main body 18 so as to be movable up and down, and is moved up and down by a vertical movement means (not shown).

A tapered surface 12 a is formed on the outer peripheral surface of the outer peripheral collet 12. The tapered surface 12 a is in contact with the tapered surface 16 a formed on the inner periphery of the slide guide 16. The slide guide 16 is held so as to move up and down together with the outer peripheral collet 12 by a vertical mechanism (not shown). The outer peripheral collet 12 is biased upward by a compression spring (not shown). Thereby, when the outer peripheral collet 12 is strongly pressed by the split core assembly 10, the outer collet 12 escapes downward.
An upper presser member 14 is fixed to the outer periphery of the rod 13. The lower end 14 a of the upper pressing member 14 is in contact with the upper surface of the split core assembly 10. The tip 14 a abuts against the split core assembly 10 in a circular arc shape.
A lower presser member 15 is fixed to the apparatus main body 18. The upper end 15 a of the lower presser member 15 is in contact with the lower surface of the split core assembly 10. The tip 15a is in contact with the split core assembly 10 in a circular arc shape.

<Operational effect of stator core manufacturing device>
Next, the stator core manufacturing method includes the first to fourth steps. The first step is a step of setting the shrink fitting ring 19 to the position shown in FIG. The second step is a step of setting the split core assembly 10 in the state shown in FIG. The third step is a step of lowering the outer collet 12 together with the slide guide 16 to the position shown in FIG. The fourth step is a step of lowering the ring regulating device 3 to the position of FIG. 2 by the lowering means and fitting the shrink fitting ring 19 to the split core 10.
Each step will be described in detail below.

(First step)
The first step is a step of setting the shrink-fitting ring 19 in another place to the position shown in FIG.
The mounting pin tip 371 of the ring mounting pin 37 is inserted into the positioning hole 21 of the mounting portion 20 of the shrink fitting ring 19. Since the tip of the mounting pin tip 371 has a tapered shape, the taper surface collides with the flange of the positioning hole 21 so that it can be easily positioned and inserted.
The ring mounting pin 37 is inserted until it hits the guide circular hole 373, and the fitting portion 372 and the positioning hole 21 are fitted. The diameter E of the fitting portion 372 is Φ9 to 8.9 mm. The diameter of the positioning hole 21 shown in FIG. 3 is the same as the diameter H shown in FIG. Therefore, when the fitting portion 372 is fitted into the positioning hole 21, there is almost no clearance.
After the ring mounting pin 37 is fitted into the positioning hole 21, the mounting table 39 is in a state where the rod 38 is contracted. When the rod 38 is extended, the mounting table 39 is disposed below the mounting portion 20 of the shrink-fitting ring 19. Thereby, as shown in FIG. 1, the mounting base 39 will be in the state which supports the attaching part 20 of the shrink-fit ring 19 from the bottom. Since the mounting table 39 is supported from below, it does not hinder expansion when the shrink-fitting ring 19 is expanded.

In the state shown in FIG. 1, the shrink-fit ring 19 is heated to 350 ° C. by the band heater 22 wound around the outer periphery to expand the shrink-fit phosphorus portion 19. The shrink-fitting ring 19 expands from the normal inner diameter Φ200 mm to Φ200.8 mm by being heated. By increasing the inner diameter, the diameter of the outer periphery of the split core assembly 10 is Φ200 mm, so that the shrink fit ring 19 can be attached to the outer periphery.
When the shrink-fit ring 19 is heated to 350 ° C. by the band heater 22, the shrink-fit ring 19 has uneven heating in the band heater 22, so that unevenness occurs in the expansion direction. When unevenness occurs in the extending direction, as shown in FIG. 9, the shrink-fit ring 19 tends to shift in the circumferential direction. However, in the present embodiment, the positioning hole 21 of the shrink-fitting ring 19 and the ring mounting pin 37 are fitted with almost no clearance. Therefore, the ring mounting pin 37 does not move in the circumferential direction, and the width in which the shrink-fit ring 19 moves in the circumferential direction is small. That is, as shown in FIG. 4, the gap G between the diameter E of the upper portion 375 of the ring mounting pin 37 and the wall surface 351b of the cylindrical hole 351 of the pin guide portion 35 is in a state where there is almost no clearance. Therefore, the ring mounting pin 37 can hardly move in the circumferential direction.
On the other hand, the ring mounting pin 37 is movable in the radial direction guided by the guide rod 36 because the guide rod 36 is inserted into the guide circular hole 373. Therefore, when the shrink-fit ring 19 is heated, it expands in the radial direction.

Since the ring mounting pin 37 is guided by the pin guide portion 35, the shrink fitting ring 19 is not displaced with respect to the circumferential direction. Specifically, as shown in FIG. 6, in the case of the conventional technique, a deviation occurs in the circumferential direction of a maximum of 0.5 mm, whereas in this embodiment, a maximum of 0.048 mm. Only misalignment occurs. Therefore, compared with the prior art, the deviation in the circumferential direction could be reduced to 1/10.
In addition, when the circumferential displacement is a maximum of 0.048 mm, when the U, V, and W terminals are caulked with reference to the positioning hole 21 in the next stroke, a poor positioning may be caused due to poor positioning. Since it is almost eliminated, defective products can be reduced and production efficiency can be increased.

(Second step)
The second step is a step of setting the split core assembly 10 in the state shown in FIG.
In the previous stage of FIG. 1, the rod 13 and the upper pressing member 14 are positioned above. Further, the inner peripheral collet 11 has moved to the inner peripheral side. Moreover, the outer periphery collet 12 exists in the position shown in FIG. In this state, the lower surface of the split core assembly 10 is mounted on the front end 15a of the lower presser member 15 in contact with the front end 15a.
Next, the rod 13 is lowered. Thereby, the enlarged diameter part 13a contact | abuts to the taper surface 11a, and the inner peripheral collet 11 is moved to an outer peripheral direction. Since the 18 inner peripheral collets 11A to 11R simultaneously expand in diameter, the 18 divided cores 10A to 10R are pressed outward with a uniform force. When an excessive force is applied to the divided cores 10 </ b> A to 10 </ b> R toward the outside, the outer peripheral collets 12 </ b> A to 12 </ b> R descend along the tapered surface 16 a of the slide guide 16. Therefore, the divided cores 10A to 10R are positioned with reference to the inner peripheral collets 11A to 11R.
Thus, when the rod 13 stops at a predetermined height, the 18 divided cores 10A to 10R are positioned at predetermined positions by the 18 pairs of inner peripheral collets 11A to 11R.
Next, the 18 divided cores 10A to 10R are positioned by the 18 inner peripheral collets 11A to 11R and the 18 outer peripheral collets 12A to 12R, and at the same time, the tip 14a of the upper pressing member 14 is moved to the divided core. It abuts on the upper surface of the assembly 10 and holds the divided core assembly 10 sandwiched together with the lower pressing member 15. This state is shown in FIG.

(Third step)
The third step is a step of lowering the outer collet 12 together with the slide guide 16 to the position shown in FIG.
Next, with the inner diameter collet 11 and the upper pressing member 14 being left as they are, the outer peripheral collet 12 is lowered together with the slide guide 16 to the position shown in FIG. Even when the outer peripheral collet 12 is separated from the outer periphery of the split core assembly 10, the upper presser member 14 and the lower presser member 15 have the eighteen split cores 10A to 10R, the inner peripheral collets 11A to 11R are the inner periphery. It is held at the touched position.

(4th process)
The fourth step is a step of lowering the ring regulating device 3 to the position of FIG. 2 by the lowering means and fitting the shrink fitting ring 19 to the split core 10.
With the band heater 22 wound around the outer periphery in the first step, the positioning device 2 is lowered from the state shown in FIG. 1 to the state shown in FIG.
After the shrink fitting ring 19 is mounted at the position shown in FIG. 2, the energization to the band heater 22 is interrupted to cool the shrink fitting ring 19. As a result, the shrink-fit ring 19 contracts and the inner peripheral surface of the shrink-fit ring 19 comes into contact with the outer peripheral surfaces of the split cores 10A to 10R, and the stator core 50 is completed.

As explained in detail above, in this embodiment,
A stator that manufactures a stator core is obtained by fitting a shrink-fitted ring 19 that is heated and expanded to the outer periphery of the divided core assembly 10 that is assembled by a plurality of divided cores 10A to 10R, and the shrink-fitted ring 19 is cooled and contracted. In the stator core manufacturing apparatus 1 used for the core manufacturing method, the split core is composed of an inner diameter collet 11 that presses the inner periphery of the split core assembly 10 outward and an outer peripheral collet 12 that presses the outer periphery of the split core assembly 10 inward. A positioning device 2 for positioning the assembly 10, a movable mounting base 39 for mounting the mounting portion 20 of the shrink-fitting ring 19, a ring mounting pin 37 that fits into the positioning hole 21 formed in the mounting portion 20, By having the pin guide portion 35 that allows the ring mounting pin 37 to move only in the radial direction, the shrink-fit ring 19 moves only in the radial direction. Therefore, it does not cause the circumferential direction of the phase shift. If the movement is in the radial direction, even when the shrink-fit ring 19 is cooled and contracts, the shrink-fit ring 19 moves only in the radial direction, so that there is no circumferential phase shift. Can be attached to.
The ring mounting pin 37 is fitted into the oval fitting hole 351 of the ring restricting device 3, the diameter E of the upper portion 375 of the ring mounting pin 37 is parallel to the oval fitting hole 351. Since the distance G from the wall surface to the wall surface is almost the same, the fitting hole 351 has almost no clearance other than the radial direction. Therefore, even when the shrink-fit ring 19 is heated and expanded, it hardly expands except in the radial direction. Further, even when contracted, it hardly contracts except in the radial direction. Therefore, the phase shift in the circumferential direction does not occur, so that the shrink fitting ring 19 can be attached to the outer periphery of the split core assembly 10.

In addition, this invention is not limited to the said embodiment, A part of structure can also be changed suitably and implemented in the range which does not deviate from the meaning of invention.
For example, in the present embodiment, the upper presser member 14 is in contact with the divided core assembly 10 in a circular arc shape, but may be contacted with each of the divided cores 10A to 10R at a pinpoint.
Further, in this embodiment, when the split core assembly 10 is pressed outward due to the expansion of the inner peripheral collet 11, the outer peripheral collet 12 descends along the tapered surface 16a of the slide 16, but slides in the radial direction. A mechanism may be provided and moved outward along the radial direction.
Further, in this embodiment, shrink-fitting is performed using the molded divided core assembly 10, but the unmolded divided core is directly attached to the shrink-fitted ring 19 and then molded. good.

Further, as shown in FIG. 13, a tension spring 60 can be attached to the ring attachment pin 37. The tension spring 60 includes a spring 61, a pin fixing body 62, and a spring guide body 63. The pin fixing body 62 is fixed to the ring mounting pin 37. One end of the spring 61 is fixed to the main body connecting portion 32, and the other tongue is fixed to the pin fixing body 62. The outer periphery of the spring 61 is guided by a spring guide body 63.
The tension spring 60 can pull the ring mounting pin 37 in the radial direction by the elastic force of the spring 61. Since the ring mounting pin 37 can be pulled in the radial direction, the shrink-fit ring 19 can be pulled in the radial direction when the shrink-fit ring 19 is expanded.

DESCRIPTION OF SYMBOLS 1 Stator core manufacturing apparatus 2 Positioning apparatus ("Positioning means" in a claim)
3 Ring regulating device ("Ring regulating means" in claims)
10 split core assemblies 10A to 10R split core 11 inner peripheral collet ("inner peripheral jig" in claims)
12 outer peripheral collet ("outer peripheral jig" in claims)
19 Shrink fit ring 20 Mounting part 21 Positioning hole
39 mounting table 35 pin guide portion (“guide portion” in claims)
351 Fitting hole 37 Ring mounting pin

Claims (3)

Used in a stator core manufacturing method for manufacturing a stator core by fitting a heat-expanded shrink-fit ring on the outer periphery of a split core assembly composed of a plurality of split cores, and cooling and shrinking the shrink-fit ring. In the stator core manufacturing device,
An inner Osamu Shu for pressing the inner periphery of the split core assembly outwardly by an outer peripheral jig for pressing the outer periphery of the split core assembly inside, and positioning means for positioning the split core assembly,
A movable mounting table for mounting the mounting portion of the shrink fitting ring, a ring mounting pin that fits in a positioning hole formed in the mounting portion, and a guide portion that allows the ring mounting pin to move only in the radial direction. A ring restricting means having
After the ring mounting pin is fitted into the positioning hole, the mounting table moves to a position where the mounting portion of the shrink fitting ring can be supported from below.
The stator core manufacturing apparatus characterized by this. In the stator core manufacturing apparatus according to claim 1,
The ring mounting pin can be moved only in the radial direction by being fitted into the oval fitting hole of the ring restricting means;
The stator core manufacturing apparatus characterized by this. In the stator core manufacturing apparatus according to claim 1,
The guide portion guides the mounting pin so as to be movable only in the radial direction by inserting a plurality of guide bars into the mounting pin.
The stator core manufacturing apparatus characterized by this.

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