JP2020088151A - Insulation coating film cutting device of conductor wire and insulation coating film cutting method - Google Patents

Abstract

To provide an insulation coating film cutting device of a conductor wire, capable of suppressing the generation of burr at the time of cutting an insulation coating film of the conductor wire, and provide an insulation coating film cutting method.SOLUTION: An insulation coating film cutting device of a conductor wire, comprises: an upper die in which an insulation coating film coating the conductor wire is cut together with a part of a conductive part, the conductor wire including a conductive part and the insulation coating film and having a cross section rectangle shape continued with four side faces formed by plane surfaces connected with an R face, and the insulation coating film being on a pair of side faces facing each other and positioned in an insulation coating film cutting region; and a lower die in which the conductor wire is arranged and which is for supporting a weight applied to the conductor wire at the time of cutting via one side face of the other pair of side faces facing each other of the conductor wire. The lower die includes a reception part that receives the R face between the one side face and the pair of side faces positioned at a boundary part of the insulation coating film cutting region in a longitudinal direction of the conductor wire.SELECTED DRAWING: Figure 23

Description

The present invention relates to an insulating film cutting device and a method for cutting an insulating film of a conductor wire used for a stator winding of a stator of a rotating electric machine or the like.

In a conventional method for manufacturing a coil of a rotary electric machine such as an electric motor or a generator, an insulating coating is cut off by a cutting blade on a part of an insulating coated conductor wire to form a pair of cut surfaces facing each other with a rectangular cross section. A first insulating film cutting step, and a second insulating film cutting step of cutting the insulating film with a cutting blade to form a pair of opposite cutting surfaces having a rectangular cross section, and a second insulating film cutting step. Later, a cutting step of cutting a portion of the conductor wire formed in a rectangular cross section in the middle, a processing step of bending the cut conductor wire after the cutting step, and a conductor wire cut after the processing step And a joining step of joining the cut surfaces together by welding (see, for example, Patent Document 1).

Japanese Patent No. 4654068

In Patent Document 1, in the first insulating film cutting step and the second insulating film cutting step, the conductor wire is arranged in the lower mold and the upper mold is moved in the lower mold direction to pass through the hole formed in the lower mold. As a result, the conductor portion is cut off together with the insulating coating, and a pair of cut surfaces facing each other having a rectangular cross section is formed on a part of the conductor wire. The conductor wire is received in the lower mold in a plane. Since the lower die sides on both sides in the width direction of the conductor wire are curved surfaces, a gap is formed between the lower die and the curved surface portion of the conductor wire. As a result, when the upper mold is cut off, the scraped conductor and the insulating coating enter the gap to cause burrs.

If the coil has burrs, when the coil is inserted into the slots of the stator core, the burrs are caught and it becomes difficult to insert the coils into the slots, which deteriorates the productivity. In addition, burrs may drop during insertion of the coil slot and bending of the coil, causing insulation failure.

The present invention has been made to solve such problems, and an object thereof is to obtain an insulating film cutting device and a method for cutting an insulating film of a conductor wire that can suppress the occurrence of burrs when cutting the insulating film of the conductive wire. And

A conductor wire insulating film cutting device according to the present invention has a conductor wire having a conductor part and an insulating film coated on the conductor part, and a continuous conductor wire having a rectangular cross section in which four flat side surfaces are connected by an R surface. An upper die for cutting off the insulating film on a pair of opposing side surfaces located in the insulating film cutting region together with a part of the conductor portion, the conductor wire is arranged, and a load applied to the conductor wire during cutting is applied to the conductor. A lower die supported via one side surface of the other pair of side surfaces facing each other, wherein the lower die is located at a boundary portion with the insulating film cutting region in the length direction of the conductor wire. It has a receiving part which receives the above-mentioned R side between a pair of side faces and the above-mentioned one side face.

According to the present invention, because of the above-described configuration, the generation of a gap between the lower die and the R surface located at the boundary between the insulating film cutting region in the length direction of the conductor wire is suppressed. As a result, a conductor wire insulating film cutting device and an insulating film cutting method can be obtained which can suppress the occurrence of burrs during the cutting of the insulating film.

It is a longitudinal cross-sectional view showing a rotary electric machine according to Embodiment 1 of the present invention. FIG. 3 is a transverse cross-sectional view showing the main parts of the stator of the rotary electric machine according to Embodiment 1 of the present invention. FIG. 3 is a vertical cross-sectional view showing the main parts of the stator of the rotary electric machine according to Embodiment 1 of the present invention. It is the side view which looked at the principal part of the stator of the rotary electric machine concerning Embodiment 1 of this invention from the radial outside. It is a perspective view showing the shape of the end of the unit coil in the stator of the rotary electric machine according to Embodiment 1 of the present invention. FIG. 3 is a perspective view showing a connection state of the end portions of the unit coils in the stator of the rotating electric machine according to Embodiment 1 of the present invention. It is sectional drawing which shows the conductor wire which is the material of a unit coil. It is the top view which looked at the conductor wire from the Y direction. It is the top view which looked at the conductor wire from the X direction. It is a perspective view which shows the 1st insulating film cutting device of a comparative example. It is a figure explaining the 1st cutting process in the manufacturing method of the unit coil of a comparative example. It is a perspective view which shows the conductor wire after the 1st cutting process in the manufacturing method of the unit coil of a comparative example. It is a perspective view which shows the 2nd insulating film excision device of a comparative example. It is a figure explaining the 2nd cutting process in the manufacturing method of the unit coil of a comparative example. It is a perspective view which shows the conductor wire after the 2nd cutting process in the manufacturing method of the unit coil of a comparative example. It is a perspective view which shows the conductor wire after the cutting process in the manufacturing method of the unit coil of a comparative example. It is the side view which looked at the conductor wire and the lower model after the 1st cutting process in the manufacturing method of the unit coil of a comparative example from the X direction. FIG. 18 is a cross-sectional view taken along the line AA of FIG. 17. It is a perspective view which shows the conductor wire after the 1st cutting process in the manufacturing method of the unit coil of a comparative example. It is the side view which looked at the conductor wire and the lower model after the 2nd cutting process in the manufacturing method of the unit coil of a comparative example from the Y direction. FIG. 21 is a sectional view taken along the line BB of FIG. 20. It is a perspective view which shows the conductor wire after the 2nd cutting process in the manufacturing method of the unit coil of a comparative example. FIG. 3 is a perspective view showing a lower mold of the first insulating film cutting device used in the method for manufacturing the unit coil according to the first embodiment of the present invention. FIG. 6 is a perspective view showing a conductor wire after a first cutting step in the method for manufacturing the unit coil according to the first embodiment of the present invention. FIG. 3 is a perspective view showing a lower mold of the second insulating film cutting device used in the method for manufacturing the unit coil according to the first embodiment of the present invention. FIG. 6 is a perspective view showing a conductor wire after a second cutting step in the method for manufacturing the unit coil according to the first embodiment of the present invention. FIG. 5 is a side view of a principal part for explaining a unit coil mounting step in the method for manufacturing the stator of the rotary electric machine according to Embodiment 1 of the present invention. FIG. 6 is a side view of a principal part for explaining the first bending step of the unit coil in the method for manufacturing the stator of the rotary electric machine according to Embodiment 1 of the present invention. FIG. 7 is a side view of a principal part for explaining a second bending step of the unit coil in the method for manufacturing the stator of the rotary electric machine according to Embodiment 1 of the present invention. FIG. 6 is a side view of a main part for explaining a welding process of the unit coil in the method for manufacturing the stator of the rotary electric machine according to Embodiment 1 of the present invention. FIG. 3 is a perspective view showing an embodiment of a lower die of the first insulating film cutting device used in the method for manufacturing the unit coil according to the first embodiment of the present invention. It is a perspective view which shows the conductor wire after the 1st cutting process in the manufacturing method of the unit coil which concerns on Embodiment 2 of this invention. It is a perspective view which shows the conductor wire after the 2nd cutting process in the manufacturing method of the unit coil which concerns on Embodiment 2 of this invention. FIG. 6 is a perspective view showing a conductor wire after a second cutting step in the method for manufacturing the unit coil according to the first embodiment of the present invention. FIG. 9 is a perspective view showing an embodiment of a lower die of the first insulating coating film cutting device used in the method for manufacturing the unit coil according to the second embodiment of the present invention.

Embodiment 1.
1 is a vertical sectional view showing a rotary electric machine according to Embodiment 1 of the present invention. The vertical cross-sectional view is a cross-sectional view showing a cross section including the axis of the rotating shaft. In addition, in the present specification, for convenience, a direction parallel to the axis of the rotary shaft is the axial direction, the axis of the rotary shaft is the center, the direction orthogonal to the axis of the rotary shaft is the radial direction, and the center of the rotary shaft is the center. The direction of rotation is the circumferential direction. Further, in each drawing, the radial direction is indicated by an arrow X and the circumferential direction is indicated by an arrow Y.

In FIG. 1, a rotary electric machine 100 includes a rotary electric machine main body 101 and a control device 102 integrally attached to the rear side of the rotary electric machine main body 101.

The rotary electric machine main body 101 includes a housing 3 including a front bracket 1 and a rear bracket 2, a rotary shaft 6 rotatably supported by bearings 4 and 5 supported by the housing 3, and a coaxial shaft fixed to the rotary shaft 6. A rotor 7 rotatably installed in the housing 3 and a stator 10 fixed to the housing 3 so as to cover the outer peripheral side of the rotor 7.

The rotor 7 includes a rotor core 8 fixed to the rotary shaft 6 penetrating the axial center position, and a field coil 9 attached to the rotor core 8.

The stator 10 includes an annular stator core 11 and a stator winding 12 mounted on the stator core 11. The stator 10 is such that a stator core 11 arranged coaxially with the rotor core 8 and surrounding the rotor core 8 is sandwiched between the front bracket 1 and the rear bracket 2 under pressure from both axial sides. It is held in the housing 3.

Next, the structure of the stator 10 will be described. 2 is a cross-sectional view showing a main part of a stator of a rotary electric machine according to Embodiment 1 of the present invention, and FIG. 3 shows a main part of a stator of a rotary electric machine according to Embodiment 1 of the present invention. FIG. 4 is a vertical cross-sectional view, which is a side view of a main part of a stator of a rotary electric machine according to Embodiment 1 of the present invention as viewed from the outside in the radial direction. The cross-sectional view is a cross-sectional view showing a cross section orthogonal to the axis of the rotating shaft.

Here, for convenience of explanation, the number of slots per pole and phase is two, and the stator winding is a three-phase winding. Further, the accommodation positions in the slots of the unit coils are the first layer, the second layer, the third layer, and the fourth layer from the inner diameter side. Further, the upper side in FIG. 4 is one end side in the axial direction of the stator core 11, and the lower side in FIG. 4 is the other end side in the axial direction of the stator core 11.

As shown in FIGS. 2 to 4, the stator 10 includes an annular stator core 11 and a stator winding 12 mounted on the stator core 11. The stator core 11 is produced by laminating magnetic thin plates such as electromagnetic steel plates in an integrated manner. The stator core 11 and the annular core back 31 respectively project radially inward from the inner peripheral wall surface of the core back 31 and are circumferentially equivalent. A plurality of teeth 32 arranged at an angular pitch. The space formed between the teeth 32 adjacent in the circumferential direction becomes the slot 33. An insulator 34 for securing electrical insulation between the stator core 11 and the stator winding 12 is mounted in the slot 33. The insulator 34 is made of paper, resin, or a composite material thereof, but here, it is made in a sheet shape by sandwiching a polyimide film between meta-aramid fibers.

The stator winding 12 is formed by connecting a number of unit coils 35 inserted in the slots 33. The unit coil 35 is linearly configured by a conductor having a rectangular cross section such as copper or aluminum coated with an insulating film such as enamel resin. In each slot 33, four unit coils 35 are arranged and arranged in a row in the radial direction.

On one axial side of the stator core 11, the projecting portion of the unit coil 35 housed in the first layer and the third layer inside the slot 33 from the slot 33 is inclined to the left in FIG. Is bent to. The protruding portion of the unit coil 35 housed in the second layer and the fourth layer inside the slot 33 from the slot 33 is bent so as to be inclined to the right in FIG.

Here, one end of the unit coil 35 housed in the first layer of the one slot 33 and the second layer of the slot 33 separated from the one slot 33 in the left direction in FIG. 4 by 6 slots are housed. The one end of the unit coil 35 overlaps in the radial direction. One end of the unit coil 35 accommodated in the third layer of the one slot 33 and the unit coil 35 accommodated in the fourth layer of the slot 33 which is separated from the one slot 33 by 6 slots in the left direction in FIG. And one end of the are overlapped in the radial direction.

One ends of the unit coils 35 housed in the first layer and the second layer of the pair of slots 33 separated by 6 slots are welded and connected to each other. One ends of the unit coils 35 housed in the third layer and the fourth layer of the pair of slots 33 separated by 6 slots are welded and connected to each other. The pair of slots 33 separated by 6 slots is a pair of slots 33 located on both sides of the six teeth 32 continuous in the circumferential direction. The welded portion 36 is a joint portion formed by welding the tip portions of the unit coils 35.

On the other axial end of the stator core 11, the protruding portion of the unit coil 35 housed in the first and third layers within the slot 33 from the slot 33 is inclined to the right in FIG. Is bent like. The protruding portion of the unit coil 35 housed in the second layer and the fourth layer inside the slot 33 from the slot 33 is bent so as to be inclined to the left in FIG.

Here, the other end of the unit coil 35 accommodated in the first layer of the one slot 33 and the second layer of the slot 33 which is separated from the one slot 33 by 6 slots in the right direction in FIG. The other end of the existing unit coil 35 overlaps in the radial direction. The other end of the unit coil 35 accommodated in the third layer of the one slot 33 and the unit coil accommodated in the fourth layer of the slot 33 which is separated from the one slot 33 by 6 slots in the right direction in FIG. The other end of 35 overlaps in the radial direction.

The other ends of the unit coils 35 housed in the first layer and the second layer of the pair of slots 33 separated by 6 slots are connected by welding. The other ends of the unit coils 35 housed in the third layer and the fourth layer of the pair of slots 33 separated by 6 slots are welded and connected to each other.

As a result, two one-turn coils are formed by connecting in series the unit coils 35 housed in the first layer and the second layer of the group of slots 33 arranged at intervals of 6 slots. There is. Further, two 1-turn coils are formed by connecting in series the unit coils 35 housed in the third and fourth layers of the group of slots 33 arranged at intervals of 6 slots. . The 6-slot interval is the interval between the slots 33 located on both sides of the six teeth 32 continuous in the circumferential direction.

Here, the shape and connection structure of the terminal of the unit coil 35 will be described with reference to FIGS. 5 and 6. FIG. 5 is a perspective view showing a shape of an end portion of a unit coil in a stator of a rotary electric machine according to Embodiment 1 of the present invention, and FIG. 6 is a stator of a rotary electric machine according to Embodiment 1 of the present invention. It is a perspective view which shows the connection state of the edge parts of a unit coil.

The unit coil 35 includes a conductor portion 351 having a rectangular cross section and an insulating coating 352 that covers the conductor portion 351. As shown in FIG. 5, the insulating coatings 352 at both ends of the unit coil 35 are cut off. A region where the insulating coating 352 is cut off is referred to as a coating peeling portion 353. The film peeling portion 353 is formed in a rectangular cross section including four flat film peeling surfaces 353a. A region covered with the insulating coating 352 is referred to as a coating portion 354. A boundary portion between the film peeling portion 353 and the film portion 354 is referred to as a peeling boundary portion 355. The peeling boundary portion 355 includes four peeling boundary surfaces 355a having inclined planes. As shown in FIG. 6, the unit coils 35 are connected to each other by welding the tip ends of the two unit coils 35 aligned in the radial direction to form the welded portions 36.

Next, a method of removing the insulating coating of the unit coil of the comparative example will be described. 7 is a cross-sectional view showing a conductor wire which is a material of the unit coil, FIG. 8 is a plan view of the conductor wire viewed from the Y direction, and FIG. 9 is a plan view of the conductor wire viewed from the X direction. FIG. 10 is a perspective view showing a first insulating film cutting device of a comparative example, FIG. 11 is a diagram illustrating a first cutting step in a method of manufacturing a unit coil of a comparative example, and FIG. 12 is a unit coil of a comparative example. It is a perspective view which shows the conductor wire after the 1st cutting process in a manufacturing method. 13 is a perspective view showing a second insulating film cutting device of a comparative example, FIG. 14 is a diagram illustrating a second cutting step in a method of manufacturing a unit coil of a comparative example, and FIG. 15 is a drawing of a unit coil of a comparative example. It is a perspective view which shows the conductor wire after the 2nd cutting process in a manufacturing method. FIG. 16 is a perspective view showing the conductor wire after the cutting step in the method for manufacturing the unit coil of the comparative example. Note that FIG. 12 shows a state in which the conductor wire is arranged on the upper surface of the first lower die, and FIG. 15 shows a state in which the conductor wire is arranged on the upper surface of the second lower die.

As shown in FIGS. 7 to 9, the conductor wire 350 is a continuous conductor wire having no connection portion, in which an insulating coating 352 is coated on a conductor portion 351 such as copper or aluminum. The conductor wire 350 is a continuous conductor wire having a rectangular cross section in which the side surfaces of four planes are curved, that is, connected by the R surface C. The side surfaces A located on both sides of the conductor line 350 in the X direction are a pair of opposing side surfaces, and the side surfaces B located on both sides of the Y direction are another pair of opposing side surfaces. In the method of manufacturing the unit coil, although not shown, the first cut portion, the second cut portion, and the cut portion are arranged in a line at intervals of the length of the unit coil 35.

<First cutting step>
In the first cutting step, first, the conductor wire 350 is transported to the first cutting section. In the first cutting section, the first insulating film cutting apparatus of the comparative example shown in FIG. 10 is used. The first insulating coating film cutting device of the comparative example includes a first upper mold 41, a first lower mold 42, and a first pressing plate 43. The first lower mold 42 and the first pressing plate 43 are formed with first upper mold insertion holes 42a, 43a through which the first upper mold 41 passes, separated by a set distance. The upper surface of the first lower mold 42 and the lower surface of the first pressing plate 43 are flat. As shown in FIG. 11, the conductor wire 350 is arranged on the upper surface of the first lower mold 42 such that both side surfaces B of the conductor wire 350 in the Y direction are upper and lower surfaces. Then, the first pressing plate 43 is arranged so as to press the upper surface of the conductor wire 350 from above. The first pressing plate 43 is arranged such that the first upper mold insertion hole 43a faces the first upper mold insertion hole 42a of the first lower mold 42.

Then, the first upper die 41 is passed from above through the first upper die insertion hole 43 a of the first pressing plate 43 and the first upper die insertion hole 42 a of the first lower die 42. As a result, in a state where the conductor wire 350 is pressed by the first lower mold 42 and the first pressing plate 43, the insulating coating 352 on both side surfaces A of the conductor wire 350 in the X direction is cut off together with a part of the conductor portion 351. It At this time, the load applied to the conductor wire 350 at the time of cutting is received by the first lower mold 42 through the side surfaces B on both sides B in the Y direction on the side of the first lower mold 42.

Here, the cut surfaces on both side surfaces A of the conductor wire 350 in the X direction are formed in a surface shape that matches the shape of the cutting blade of the first upper die 41. As a result, as shown in FIG. 12, the cut surfaces on both side surfaces A of the conductor wire 350 in the X direction are located on both sides of the film peeling surface 353a and the film peeling surface 353a in the length direction of the conductor wire 350, respectively. And a pair of peeling boundary surfaces 355a. The film peeling surface 353a is formed on a plane parallel to the length direction of the conductor wire 350. The peeling boundary surface 355a is formed on a plane inclined with respect to the length direction of the conductor wire 350.

<Second excision step>
In the second cutting step, first, the conductor wire 350 is transported to the second cutting section. In the second cutting section, the second insulating film cutting apparatus of the comparative example shown in FIG. 13 is used. The second insulating film cutting device of the comparative example includes a second upper mold 51, a second lower mold 52, and a second pressing plate 53. The second lower mold 52 and the second pressing plate 53 are formed with second upper mold insertion holes 52a, 53a through which the second upper mold 51 is inserted, separated by a set distance. Further, a convex portion 52b is formed between the second upper mold insertion holes 52a on the upper surface of the second lower mold 52. The upper surface of the second lower mold 52 is formed in a flat surface except for the convex portion 52b. The lower surface of the second pressing plate 53 is formed into a flat surface. The convex portion 52b has a shape along the film peeling surface 353a formed on the side surface A of the conductor wire 350 in the first cutting step and the pair of peeling boundary surfaces 355a, that is, the conductor wire 350 cut in the first cutting step. It is formed in a surface shape along the cut surface of the side surface A. As shown in FIG. 14, the conductor wire 350 is arranged on the upper surface of the second lower mold 52 such that both side surfaces A in the X direction are upper and lower surfaces. At this time, the conductor wire 350 is arranged so that the convex portion 52b is placed in the concave portion formed by the film peeling surface 353a and the pair of peeling boundary surfaces 355a. The cutting surface composed of the coating film peeling surface 353a and the pair of peeling boundary surfaces 355a is in contact with the convex portion 52b. Then, the second pressing plate 53 is arranged so as to press the upper surface of the conductor wire 350 from above. The second pressing plate 53 is arranged such that the second upper mold insertion hole 53a faces the second upper mold insertion hole 52a of the second lower mold 52.

Although the lower surface of the second pressing plate 53 is a flat surface, even if a convex portion having a surface shape along the side surface A of the conductor wire 350 cut in the first cutting step is formed on the lower surface of the second pressing plate 53. Good. In this case, when the second pressing plate 53 is arranged, the convex portion 523b of the second lower mold 52 and the convex portion of the second pressing plate are inserted into the concave portions on both side surfaces A of the conductor wire 350, and the cut surface is cut. Touch. As a result, the conductor wire 350 is held between the second lower mold 53 and the second pressing plate 53 in a state where movement in the vertical direction is restricted.

Next, the second upper mold 51 is passed through the second upper mold insertion hole 53a of the second pressing plate 53 and the second upper mold insertion hole 52a of the second lower mold 52 from above. As a result, in a state where the conductor wire 350 is pressed by the second lower mold 52 and the second pressing plate 53, the insulating coating 352 on both side surfaces B of the conductor wire 350 in the Y direction is cut off together with a part of the conductor portion 351. It The load applied to the film peeling surface 353a and the peeling boundary surface 355a during cutting is received by the convex portion 52b of the second lower mold 52. Thereby, the coating peeling surface 353a and the peeling boundary surface 355a are suppressed from being deformed in the direction of the second lower mold 52 by the load at the time of cutting.

Here, the cut surfaces on both side surfaces B of the conductor wire 350 in the Y direction are formed in a surface shape that matches the shape of the cutting blade of the second upper mold 51. As a result, as shown in FIG. 15, the cut surfaces on both side surfaces B of the conductor wire 350 in the Y direction are located on both sides of the film peeling surface 353a and the film peeling surface 353a in the length direction of the conductor wire 350, respectively. And a pair of peeling boundary surfaces 355a. The film peeling surface 353a is formed on a plane parallel to the length direction of the conductor wire 350. Thereby, the film peeling portion 353 having the film peeling surface 353a as four surfaces is configured. A peeling boundary portion 355 having four peeling boundary surfaces 355a formed on a plane inclined with respect to the length direction of the conductor wire 350 is configured. Then, the film peeling portion 353 and the pair of peeling boundary portions 355 form an insulating film cutting region.

<Cutting process>
In the cutting step, the conductor wire 350 is conveyed to the cutting section. At the cutting portion, as shown in FIG. 16, the film peeling portion 353 of the conductor wire 350 is cut at the center portion of the conductor wire 350 in the length direction. The conductor wire 350 is transported in the length direction with the length of the unit coil 35 as a transport pitch, and the first cutting process, the second cutting process, and the cutting process are performed. As a result, the unit coil 35 in which the film peeling portion 353 and the peeling boundary portion 355 are formed at both ends is manufactured.

Next, problems of the method for manufacturing the unit coil of the comparative example will be described. 17 is a side view of the conductor wire and the lower die after the first cutting step in the method for manufacturing the unit coil of the comparative example as seen from the X direction, and FIG. 18 is a sectional view taken along the line AA of FIG. FIG. 19 is a perspective view showing the conductor wire after the first cutting step in the method for manufacturing the unit coil of the comparative example. 20 is a side view of the conductor wire and the lower die after the second cutting step in the method for manufacturing the unit coil of the comparative example as seen from the Y direction, and FIG. 21 is a sectional view taken along the line BB of FIG. FIG. 22 is a perspective view showing the conductor wire after the second cutting step in the method for manufacturing the unit coil of the comparative example.

The upper surface of the first lower mold 42 of the first insulating coating film cutting device of the comparative example is a flat surface as shown in FIGS. 17 and 18. The corner portion of the rectangular cross section of the conductor wire 350 is an R surface C. Therefore, as shown in FIG. 18, a gap 42c is formed in a portion where the first lower die 42 and the lower R surface C of the conductor wire 350 face each other. Therefore, at the time of cutting by the first upper mold 41, the insulating coating 352 and the conductor portion 351 during cutting enter the gap 42c. Then, as shown in FIG. 19, the insulating coating 352 and the conductor portion 351 that have entered the gap 42c cannot be completely cut off, and remain as a burr 356 on the conductor wire 350.

The upper surface portion of the second lower mold 52 of the second insulating coating film cutting device of the comparative example, which faces the peeling boundary surface 355a, is a flat surface, as shown in FIG. Therefore, as shown in FIG. 21, a gap 52c is formed in a portion where the second lower mold 52 and the lower R surface C of the peeling boundary surface 355a face each other. Therefore, the insulating coating 352 and the conductor portion 351 that are being cut off enter the gap 52c during the cutting by the second upper mold 51 as in the first cutting step. Then, as shown in FIG. 22, the insulating coating 352 and the conductor portion 351 that have entered the gap 52c cannot be cut off completely and remain as a burr 356 on the conductor wire 350.

Next, a method of manufacturing the unit coil in the method of manufacturing the stator according to the first embodiment will be described. FIG. 23 is a perspective view showing a lower mold of the first insulating film cutting device used in the method for manufacturing the unit coil according to the first embodiment of the present invention, and FIG. 24 is a unit coil according to the first embodiment of the present invention. FIG. 25 is a perspective view showing a conductor wire after the first cutting process in the manufacturing method of FIG. 25, and FIG. 25 is a perspective view showing a lower mold of the second insulating film cutting device used in the manufacturing method of the unit coil according to the first embodiment of the present invention. FIG. 26 is a perspective view showing the conductor wire after the second cutting step in the method of manufacturing the unit coil according to the first embodiment of the present invention. Note that FIGS. 24 and 26 show a state in which the conductor wires are arranged on the upper surfaces of the first lower mold and the second lower mold.

Here, the manufacturing method of the unit coil in the first embodiment has a first cutting step, a second cutting step, and a cutting step, like the manufacturing method of the comparative example. The first insulating film cutting device according to the first embodiment includes a first upper mold 41, a first lower mold 42A, and a first pressing plate 43. The second insulating film cutting device according to the first embodiment includes a second upper mold 51, a second lower mold 52A, and a second pressing plate 53. Thus, the first insulating film cutting device and the second insulating film cutting device according to the first embodiment are the first insulating film cutting device of the comparative example except that the first lower mold 42A and the second lower mold 52A are different. It is configured similarly to the device and the second insulating film cutting device. Further, the insulating film cutting method according to the first embodiment is the same as the insulating film cutting method of the comparative example except that the first lower mold 42A and the second lower mold 52A are used.

As shown in FIG. 23, on the upper surface of the first lower mold 42A, a separation boundary surface 355a between the side surface B facing the first lower mold 42A and the pair of side surfaces A and in the length direction of the conductor wire 350. A first receiving portion 42d having a surface shape along the R-face C located at the boundary portion between and is formed. As a result, as shown in FIG. 24, in the first cutting step, the conductor wire 350 is moved to the first lower portion with the R surface C of the conductor wire 350 on the first lower mold 42A side being in contact with the first receiving portion 42d. It is arranged on the upper surface of the mold 42A. As a result, one side surface B of the pair of side surfaces B of the conductor wire 350 is received by the upper surface of the first lower mold 42A. Further, the first receiving portion 42d receives the R surface C between the one side surface B and the pair of side surfaces A located at the boundary with the insulating film cutting region in the length direction of the conductor wire 350. The load applied to the conductor wire 350 during cutting is received by the upper surface of the first lower mold 42A and the first receiving portion 42d.

Therefore, the gap 42c formed when the first lower mold 42 of the comparative example is used is eliminated. This can prevent the insulating coating 352 and the conductor portion 351 that are being cut off from entering between the first lower mold 42A and the R surface C of the conductor wire 350 during cutting by the first upper mold 41. As a result, the occurrence of burrs 356 is suppressed. Here, it is ideal that the concave surface of the first receiving portion 42d is formed in a surface shape along the R surface C of the conductor wire 350, and the gap 42c is eliminated. However, the concave surface of the first receiving portion 42d does not necessarily have to be a surface shape that eliminates the gap 42c, and may be a surface shape that can reduce the gap 42c. As a result, the gap 42c is reduced, so that the amount of the insulating coating 352 and the conductor portion 351 being cut into the gap 42c is reduced, and the burr 356 can be suppressed.

On the upper surface of the second lower mold 52A, as shown in FIG. 25, a separation boundary surface 355a between the side surface A facing the second lower mold 52A and the pair of side surfaces B and in the length direction of the conductor wire 350. A second receiving portion 52d having a surface shape along the R surface C located at the boundary portion between and is formed. As a result, as shown in FIG. 26, in the second cutting step, the conductor wire 350 is moved to the second lower portion while the R surface C of the conductor wire 350 on the second lower mold 52A side is in contact with the second receiving portion 52d. It is arranged on the upper surface of the mold 52A. As a result, one side surface A of the pair of side surfaces A of the conductor wire 350 is received by the convex portion 52b of the second lower mold 52. Further, the second receiving portion 52d receives the R surface C between the one side surface A and the pair of side surfaces B, which is located at the boundary with the insulating film excision region in the length direction of the conductor wire 350. Further, the load applied to the conductor wire 350 at the time of cutting is received by the convex portion 52b and the second receiving portion 52d of the second lower mold 52A.

Therefore, the gap 52c formed when the second lower mold 52 of the comparative example is used is eliminated. This can prevent the insulating coating 352 and the conductor portion 351 that are being cut off from entering between the second lower mold 52A and the R surface C of the conductor wire 350 during the cutting by the second upper mold 51. As a result, the occurrence of burrs 356 is suppressed. Here, it is ideal that the concave surface of the second receiving portion 52d is formed in a surface shape along the R surface C of the conductor wire 350 and the gap 52c is eliminated. However, the concave surface of the second receiving portion 52d does not necessarily have to be a surface shape that eliminates the gap 52c, and may be a surface shape that can reduce the gap 52c. As a result, the gap 52c is reduced, so that the amount of the insulating coating 352 and the conductor portion 351 being cut into the gap 52c is reduced, and the burr 356 can be suppressed.

Next, a method of manufacturing the stator according to the first embodiment will be described. FIG. 27 is a side view of a main part for explaining a unit coil mounting step in the method for manufacturing the stator of the rotary electric machine according to Embodiment 1 of the present invention, and FIG. 28 is the rotary electric machine according to Embodiment 1 of the present invention. 29 is a side view of a main part for explaining the first bending step of the unit coil in the stator manufacturing method of FIG. 29, and FIG. 29 is the second bending of the unit coil in the stator manufacturing method of the rotating electric machine according to Embodiment 1 of the present invention. FIG. 30 is a side view of the main part for explaining the steps, and FIG. 30 is a side view of the main part for explaining the welding step of the unit coil in the method for manufacturing the stator of the rotating electric machine according to Embodiment 1 of the present invention. 27 to 30 are side views of the main part of the stator as viewed from the outside in the radial direction.

<Unit coil installation process>
First, the insulator 34 is attached to each slot 33 of the stator core 11. Next, as shown in FIG. 27, four unit coils 35 thus manufactured are mounted in each slot 33, one from each axial end. At this time, both ends of each unit coil 35 protrude from the slot 33.

<First bending step of unit coil>
Then, as shown in FIG. 28, the portion of the unit coil 35 projecting from each slot 33 toward the one end in the axial direction is bent in the circumferential direction. At this time, the protruding portion of the unit coil 35 protruding from the first layer and the third layer of the slot 33 toward the one end in the axial direction is bent to the left in FIG. 28. The protruding portion of the unit coil 35 protruding from the second layer and the fourth layer of the slot 33 toward the one end side in the axial direction is bent rightward in FIG. 28. Further, the region including the film peeling portion 353 on one axial side of each unit coil 35 is bent so as to extend axially outward.

As a result, an area including the film peeling portion 353 on one axial side of the unit coil 35 housed in the first layer of the one slot 33 and a slot 6 slots left from the one slot 33 in the left direction in FIG. 28. A region of the unit coil 35 housed in the second layer 33 of the unit coil 35, which includes the film peeling portion 353 on one axial side, overlaps in the radial direction. In addition, an area including the film peeling portion 353 on one end side in the axial direction of the unit coil 35 housed in the third layer of the one slot 33 and a slot 33 that is separated from the one slot 33 by 6 slots in the left direction in FIG. 28. The region including the film peeling portion 353 on the one axial end side of the unit coil 35 accommodated in the fourth layer of FIG.

<Second bending step of unit coil>
Next, as shown in FIG. 29, the portion of the unit coil 35 projecting from each slot 33 to the other end side in the axial direction is bent in the circumferential direction. At this time, the protruding portion of the unit coil 35 protruding from the first layer and the third layer of the slot 33 toward the other end side in the axial direction is bent to the right in FIG. 29. The protruding portion of the unit coil 35 protruding from the second layer and the fourth layer of the slot 33 toward the other end side in the axial direction is bent leftward in FIG. 29. Further, the region including the film peeling portion 353 on the other axial end side of each unit coil 35 is bent so as to extend axially outward.

As a result, the area including the film peeling portion 353 on the other axial side of the unit coil 35 housed in the first layer of the one slot 33 and the slot 33 is separated from the one slot 33 by 6 slots in the right direction in FIG. 29. A region including the film peeling portion 353 on the other end side in the axial direction of the unit coil 35 housed in the second layer of the slot 33 overlaps in the radial direction. In addition, a region including the film peeling portion 353 on the other end side in the axial direction of the unit coil 35 housed in the third layer of the one slot 33 and a slot 6 slots away from the one slot 33 in the right direction in FIG. 29. A region including the film peeling portion 353 on the other end side in the axial direction of the unit coil 35 housed in the fourth layer 33 is radially overlapped.

<Welding process>
Then, as shown in FIG. 30, the coating stripping portions 353 that are radially overlapped with each other are welded on both axial ends of the stator core 11. As a result, the unit coils 35 to be connected are connected to each other by the welding portion 36, and the stator 10 is manufactured.

In the stator manufacturing method according to the first embodiment, generation of burrs 356 at the boundary between the unit coil 35 and the separation boundary 355 is suppressed. Therefore, in the mounting process of the unit coil 35, there is no burr 356 that is caught by the insulator 34 when the unit coil 35 is inserted into the slot 33 in which the insulator 34 is mounted. Therefore, it is possible to prevent defective insertion of the unit coil 35 due to the burr 356 being caught by the insulator 34, breakage and displacement of the insulator 34, and to improve product quality. Further, in the steps such as the first bending step and the second bending step of the unit coil 35, when the unit coils 35 pass each other, the burr 356 may damage the other unit coil 35, and the burr 356 may be dropped to cause insulation failure. Occurrence can be suppressed.

In the first embodiment, four unit coils are attached to the slots of the stator core one by one, but a group of four unit coils arranged in a row in the radial direction has one slot in the circumferential direction. An annular unit coil assembly may be assembled by arranging the same number of slots as the slots, and the unit coil assembly may be mounted in the slots of the stator core.

Further, in the first lower die 42A of the first insulating coating film cutting device used in the first embodiment, the upper surface thereof is partially projected to form the convex first receiving portion 42d, but the first receiving portion 42d is formed. As shown in FIG. 31, 42d may be formed in a concave shape by recessing the upper surface of the first lower mold 42A. In the second lower mold 52A of the second insulating film cutting device, the upper surface thereof is partially projected to form the second receiving portion 52d having a convex shape. The upper surface of the lower mold 52A may be recessed to form a concave shape.

Embodiment 2.
32 is a perspective view showing the conductor wire after the first cutting step in the unit coil manufacturing method according to Embodiment 2 of the present invention, and FIG. 33 is the unit coil manufacturing method according to Embodiment 2 of the present invention. FIG. 6 is a perspective view showing a conductor wire after the second cutting step in FIG. 32 and 33 show a state in which the conductor wires are arranged on the upper surfaces of the first lower mold and the second lower mold.

Here, the method for manufacturing the unit coil in the second embodiment has a first cutting step, a second cutting step, and a cutting step, similar to the method for manufacturing the unit coil in the first embodiment. The first insulating film cutting device according to the second embodiment is configured in the same manner as the first insulating film cutting device according to the first embodiment except that the first lower mold 42B is different. The second insulating film cutting device according to the first embodiment is configured in the same manner as the second insulating film cutting device according to the first embodiment except that the second lower mold 52B is different.

As shown in FIG. 32, the first receiving portion 42e of the first lower mold 42B has a receiving portion 42e1 and a first wall portion 42e2. The receiving portion 42e1 is located along the R surface C between the side surface B located on the side of the first lower mold 42B and the pair of side surfaces A, which is located at the boundary portion with the insulating film excision region in the length direction of the conductor wire 350. It has a concave shape. The first wall portion 42e2 is formed in a planar shape along the side surface A of the conductor wire 350. Accordingly, in the conductor wire 350 arranged in the first lower mold 42B, one side surface B of the pair of side surfaces B is received by the upper surface of the first lower mold 42B. Further, the receiving surface 42e1 receives the R surface C between the one side surface B and the pair of side surfaces A located at the boundary with the insulating coating cut region in the length direction of the conductor wire 350. Further, the pair of side surfaces A located at the boundary with the insulating coating cut region in the length direction of the conductor wire 350 is received by the first wall portion 42e2. Further, the load applied to the conductor wire 350 at the time of cutting is received by the upper surface of the first lower mold 42B and the receiving portion 42e1.

The second receiving portion 52e of the second lower mold 52B has a receiving portion 52e1 and a second wall portion 52e2, as shown in FIG. The receiving portion 52e1 is located at a boundary between the conductor wire 350 and the insulating film cutting region in the longitudinal direction, and extends along the R surface C between the side surface A located on the second lower mold 52B side and the pair of side surfaces B. It has a concave shape. The second wall portion 52e2 is formed in a planar shape along the side surface B of the conductor wire 350. As a result, the conductor wire 350 arranged in the second lower mold 52B has one side surface A of the pair of side surfaces A received by the convex portion 52b of the second lower mold 52B. Further, the receiving surface 52e1 receives the R surface C between the one side surface A and the pair of side surfaces B located at the boundary with the insulating film cutting region in the length direction of the conductor wire 350. Furthermore, the pair of side surfaces B located at the boundary with the insulating film cutting region in the length direction of the conductor wire 350 is received by the second wall portion 52e2. The load applied to the conductor wire 350 during cutting is received by the convex portion 52b and the receiving portion 52e1 of the second lower mold 52A.

In the first embodiment, on the upper surface of the first lower die 42A, a pair of side surfaces B and a side surface B on the side of the first lower die 42A, which is located at the boundary with the insulating film excision region in the length direction of the conductor wire 350. A first receiving portion 42d having a surface shape along the R surface C between A and A is formed. That is, the first receiving portion 42d of the first lower mold 42A has no portion along the side surface A of the conductor wire 350. Therefore, as shown in FIG. 34, at the time of cutting by the first upper mold 41, the insulating coating 352 and the conductor portion 351 during cutting may escape from the peeling boundary surface 355a to the side surface A, and burrs 357 may occur. It was

In addition, on the upper surface of the second lower mold 52A, between the side surface A on the second lower mold 52A side and the pair of side surfaces B, which is located at the boundary with the insulating film excision region in the length direction of the conductor wire 350. A second receiving portion 52d having a surface shape along the R surface C is formed. That is, the first receiving portion 42d of the second lower mold 52A has no portion along the side surface B of the conductor wire 350. Therefore, as shown in FIG. 34, at the time of cutting by the second upper mold 51, the insulating coating 352 and the conductor portion 351 during cutting may escape from the peeling boundary surface 355a to the side surface B, and a burr 357 may occur. It was

As shown in FIG. 32, the first receiving part 42e of the first lower mold 42B according to the second embodiment is located at the boundary between the conductor wire 350 and the insulating film cutting region in the length direction. It has a receiving portion 42e1 having a surface shape along the R surface C between the side surface B on the 42B side and the pair of side surfaces A, and a first wall portion 42e2 having a flat surface along the side surface A of the conductor wire 350. ..

Therefore, in the conductor wire 350 installed in the first lower mold 42B, the side surface B on the first lower mold 42B side is received by the upper surface of the first lower mold 42B. Furthermore, the R surface C between the side surface B on the side of the first lower mold 42B and the pair of side surfaces A, and the pair of side surfaces A, which are located at the boundary with the insulating film cutting region in the length direction of the conductor wire 350, are formed. , And is received by the receiving portion 42e1 and the first wall portion 42e2 of the first receiving portion 42e of the first lower mold 42B. This can prevent the insulating coating 352 and the conductor portion 351 that are being cut off from entering between the first lower mold 42B and the R surface C of the conductor wire 350 during cutting by the first upper mold 41. Further, the first wall portion 42e2 of the first receiving portion 42e is in contact with the side surface A of the conductor wire 350. Therefore, the first wall portion 42e2 prevents the insulating coating film 352 and the conductor portion 351 which are being cut off from escaping from the peeling boundary surface 355a to the side surface A during the cutting by the first upper mold 41. This suppresses the generation of burrs 356 and 357.

In addition, as shown in FIG. 33, the second receiving portion 52e of the second lower die 52B is located at the boundary portion with the insulating film excision region in the length direction of the conductor wire 350, and is located on the second lower die 52B side. It has a receiving portion 52e1 having a surface shape along the R surface C between the side surface A and the pair of side surfaces B, and a second wall portion 52e2 having a flat surface along the side surface B of the conductor wire 350.

Therefore, in the conductor wire 350 installed on the second lower mold 52B, the cut surface of the side surface A on the second lower mold 52B side is received by the convex portion 52b of the second lower mold 52B. Further, the R surface C between the side surface A on the second lower mold 52B side and the pair of side surfaces B, and the pair of side surfaces B, which are located at the boundary portion with the insulating film excision region in the length direction of the conductor wire 350, are formed. , The receiving portion 52e1 and the second wall portion 52e2 of the second receiving portion 52e of the second lower mold 52B. This can prevent the insulating coating 352 and the conductor portion 351 that are being cut off from entering between the second lower mold 52B and the R surface C of the conductor wire 350 during the cutting by the second upper mold 51. Further, the second wall portion 52e2 of the second receiving portion 52e is in contact with the side surface B of the conductor wire 350. Therefore, when the second upper mold 51 is used for cutting, the insulating wall 352 and the conductor portion 351 during cutting are prevented from escaping from the peeling boundary surface 355a to the side surface B by the second wall portion 52e2. Thereby, the burrs 356 and 357 are suppressed from being generated, and the quality of the unit coil 35 is improved.

In the second embodiment, the receiving portion 42e1 of the first receiving portion 42e of the first lower mold 42B is formed in a surface shape that follows the R surface C and the side surface A of the conductor wire 350, and it is ideal to eliminate the gap. Is. However, the surface shape of the receiving portion 42e1 does not necessarily have to be a surface shape that eliminates the gap between the conductor wire 350 and the receiving portion 42e1, and may be a surface shape that can reduce the gap. As a result, the gap between the conductor wire 350 and the receiving portion 42e1 is reduced, so that the amount of the insulating coating 352 and the conductor portion 351 being cut into the gap is reduced, and the occurrence of burrs can be suppressed.

Further, the first wall portion 42e2 of the first receiving portion 42e of the first lower mold 42B is formed in a surface shape along the side surface A of the conductor wire 350, and it is ideal to eliminate the gap. However, the surface shape of the first wall portion 42e2 does not necessarily have to be a surface shape that eliminates the gap between the conductor wire 350 and the first wall portion 42e2, as long as it is a surface shape that can reduce the gap. Good. As a result, the gap between the conductor wire 350 and the first wall portion 42e2 is reduced, so that the amount of the insulating coating 352 and the conductor portion 351 being cut into the gap is reduced, and the occurrence of burrs can be suppressed.

Further, the receiving portion 52e1 of the second receiving portion 52e of the second lower mold 52B is formed in a surface shape along the R surface C and the side surface B of the conductor wire 350, and it is ideal to eliminate the gap. However, the surface shape of the receiving portion 52e1 does not necessarily have to be a surface shape that eliminates the gap between the conductor wire 350 and the receiving portion 52e1, and may be a surface shape that can reduce the gap. As a result, the gap between the conductor wire 350 and the receiving portion 52e1 is reduced, so that the amount of the insulating coating 352 and the conductor portion 351 being cut into the gap is reduced, and the occurrence of burrs can be suppressed.

Further, the second wall portion 52e2 of the second receiving portion 52e of the second lower mold 52B is formed in a surface shape along the side surface B of the conductor wire 350, and it is ideal to eliminate the gap. However, the surface shape of the second wall portion 52e2 does not necessarily have to be a surface shape that eliminates the gap between the conductor wire 350 and the second wall portion 52e2, as long as it is a surface shape that can reduce the gap. Good. As a result, the gap between the conductor wire 350 and the second wall portion 52e2 is reduced, so that the amount of the insulating coating 352 and the conductor portion 351 that are being cut into the gap is reduced, and the occurrence of burrs can be suppressed.

In the first lower mold 42B of the first insulating coating film cutting device used in the second embodiment, the upper surface of the first lower mold 42B is partially projected to form the convex first receiving portion 42d. As shown in FIG. 35, 42d may be formed in a concave shape by recessing the upper surface of the first lower mold 42B. In the second lower mold 52B of the second insulating coating film cutting device, the upper surface thereof is partially projected to form the second receiving portion 52d having a convex shape. The upper surface of the lower mold 52B may be recessed to form a concave shape.

In each of the above embodiments, four unit coils are arranged in one row in the slot, but the number of unit coils arranged in one row in the slot is not limited to four. Any book will do.
Further, although the linear unit coil is used in each of the above-described embodiments, the unit coil is not limited to the linear unit coil. For example, a U-shaped unit coil or a spirally wound unit coil is used. Can be used.
Further, in each of the above-described embodiments, the tip portions of the unit coils are joined by welding, but the joining means may be gas welding, fusion welding such as laser welding, pressure welding such as diffusion joining, brazing, etc. Contact can be used.

Further, in each of the above-described embodiments, the number of slots is formed at a rate of 2 per pole/phase, but the number of slots per pole/phase is not limited to 2, and may be 1, for example. When the number of slots is one for each pole and each phase, unit coils separated by three slots are connected to each other.
Further, in each of the above-described first embodiments, the stator winding is configured as a three-phase winding, but the number of phases of the stator winding is not limited to three and may be five or seven.

42A, 42B 1st lower mold, 42d 1st receiving part, 42e 1st wall part, 52A, 52B 2nd lower mold, 52b convex part, 52d 2nd receiving part, 52e 2nd wall part, 350 conductor wire, 351 conductor Part, 352 insulating coating, 353 coating peeling portion (insulating coating cutting area), 354 coating portion, 355 peeling boundary portion (insulating coating cutting area), A and B side surfaces, CR surface.

A conductor wire insulating film cutting device according to the present invention has a conductor wire having a conductor part and an insulating film coated on the conductor part, and a continuous conductor wire having a rectangular cross section in which four flat side surfaces are connected by an R surface. An upper die for cutting off the insulating film on a pair of opposing side surfaces located in the insulating film cutting region together with a part of the conductor portion, the conductor wire is arranged, and a load applied to the conductor wire during cutting is applied to the conductor. A lower die supported through one side surface of the other pair of side surfaces facing each other, wherein the lower die has insulating film non-cutting regions on both sides of the insulating film cutting region in the length direction of the conductor wire. And a receiving portion that receives the R surface between the pair of side surfaces and the one side surface, which is located at a boundary portion with the insulating film excision region .

Claims (8)

A pair of opposing pair of conductor wires having a conductor portion and an insulating coating film coated on the conductor portion, and having a rectangular cross section in which four flat side surfaces are connected by an R surface are located in the insulating coating film cutting region. An upper mold for cutting off the insulating coating on the side surface together with a part of the conductor portion,
The conductor wire is arranged, and a lower die that supports a load applied to the conductor wire during cutting through one side surface of another pair of side surfaces of the conductor wire facing each other,
The lower mold is a conductor wire having a receiving portion that receives the R surface between the pair of side surfaces and the one side surface located at a boundary portion with the insulating film cutting region in the length direction of the conductor wire. Insulation film excision device. The conductor according to claim 1, wherein the receiving portion is formed in a surface shape along the R surface between the pair of side surfaces and the one side surface located at the boundary portion with the insulating film cutting region. Wire insulation coating excision device. The conductor film insulating film cutting device according to claim 1 or 2, wherein the receiving portion further has wall portions facing the pair of side surfaces located at the boundary with the insulating film cutting region. The insulating coating film cutting device for a conductor wire according to claim 1, wherein the receiving portion has a convex shape. The conductor film insulating film cutting device according to claim 1, wherein the receiving portion has a concave shape. A pair of opposing pair of conductor wires having a conductor portion and an insulating coating film coated on the conductor portion, and having a rectangular cross section in which four flat side surfaces are connected by an R surface are located in the insulating coating film cutting region. A first cutting step of cutting the insulating coating on the side surface together with a part of the conductor portion;
After the first cutting step, a second cutting step of cutting the insulating coating on the other pair of opposite side surfaces located in the insulating coating cutting area of the conductor wire together with a part of the conductor portion. ,
In the first cutting step, one of the other pair of side surfaces of the conductor wire, and the other pair of side surfaces located at a boundary portion between the conductor wire and the insulating coating film cut region in the length direction. In a state where the R surface between the one side surface and the pair of side surfaces is received, the insulating coating on the pair of side surfaces in the insulating coating cutting region is cut off together with a part of the conductor portion,
In the second cutting step, one side surface of the pair of side surfaces, which is located at a cutting surface of one side surface of the pair of side surfaces and a boundary portion with the insulating film cutting area in the length direction of the conductor wire. Insulation of a conductor wire in which the R surface between the other pair of side surfaces is received and the insulation coating on the other pair of side surfaces of the insulation coating removal area is removed together with a part of the conductor portion. Capsulation method. In the first cutting step, the pair of side surfaces of the pair of side surfaces of the insulating coating cut area are further received in a state where the pair of side surfaces located at a boundary portion with the insulating coating cut area in the length direction of the conductor wire are further received. The method for removing an insulating coating of a conductor wire according to claim 6, wherein the insulating coating is removed together with a part of the conductor portion. In the second cutting step, the other pair of side surfaces of the insulating film in the lengthwise direction of the conductor wire is further received while the pair of other side surfaces located at the boundary with the insulating film cutting area is further received. The method for removing an insulating coating of a conductor wire according to claim 6 or 7, wherein the insulating coating on the pair of side surfaces is cut together with a part of the conductor portion.

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