JP2015153571A - Device and method for manufacturing aggregated conductive wires - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for manufacturing aggregated conductive wires, capable of forming a uniform insulating layer around the outer periphery of a flat conductor.SOLUTION: A device 1 for manufacturing aggregated conductive wires includes: a stranded wire forming part 10 for twisting a plurality of element wires 20 together with each other to form a stranded wire 25; a molding part 13 for compressing the outer periphery of the stranded wire 25 to form a flat conductor 30 having a rectangular cross section; an oxide film forming part 14 for heat treating the flat conductor 30 so as to form an oxide film on the surface of each of the element wires of the flat conductor 30; and an insulating layer forming part 15 for forming an insulating layer on the outer periphery of the flat conductor 37 after formation of the oxide film. The oxide film forming part 14 forms the oxide film on the surface of each of the element wires, while binding at least one outer peripheral surface of the outer peripheral surfaces of the flat conductor.

Description

  The present invention relates to an assembly conductor manufacturing apparatus and an assembly conductor manufacturing method.

  For example, as a conducting wire used for a motor, a collective conducting wire configured by assembling a plurality of strands is known. By using such a collective conducting wire, the power capacity of the conducting wire can be increased. Moreover, the eddy current loss which arises when a conducting wire is used in a magnetic field can be reduced by comprising one conducting wire with a some strand.

  Patent Document 1 discloses a technique related to a method for manufacturing a collective conducting wire. In the technique disclosed in Patent Document 1, a plurality of strands are twisted together to form a stranded wire, and then the stranded wire is compression-molded using a molding die so that the cross-sectional shape of the stranded wire is rectangular. A flat rectangular conductor is formed. The outer periphery of the flat conductor is covered with an insulating material made of resin or the like to form an insulating layer, thereby forming a collective conducting wire. Here, an oxide film (insulating film) made of a metal oxide film or the like is formed on the surface of each of the plurality of strands.

JP 2009-199749 A

  As described in the background art, in the technique disclosed in Patent Document 1, a plurality of strands covered with an oxide film are twisted to form a stranded wire, and then the stranded wire is compression-molded. A rectangular conductor having a rectangular cross-sectional shape is formed. However, when a stranded wire is compression-molded when a flat conductor is formed, there is a problem that the oxide film on the surface of each strand constituting the stranded wire is destroyed and insulation between the strands cannot be maintained. . In order to solve such a problem, a heat treatment step is required in which after forming a rectangular conductor by compression molding a stranded wire, the rectangular conductor is heat-treated to form an oxide film on the surface of each strand.

  However, when heat treatment is performed after the flat conductor is formed, the strands of the individual wires constituting the flat conductor are returned, and the flat conductor is twisted. For this reason, when an insulating layer made of resin or the like is formed on the outer periphery of the flat conductor, the flat conductor is twisted inside the mold for forming the insulating layer, and the insulating layer is uniformly formed on the outer periphery of the flat conductor. There is a problem that it cannot be performed (see FIGS. 12, 16, and 17).

  In view of the above problems, an object of the present invention is to provide an assembly conductor manufacturing apparatus and an assembly conductor manufacturing method capable of uniformly forming an insulating layer on the outer periphery of a rectangular conductor.

  The collective conducting wire manufacturing apparatus according to the present invention forms a stranded wire forming portion that twists a plurality of strands to form a stranded wire, and a rectangular conductor having a rectangular cross-sectional shape by compressing the outer periphery of the stranded wire. After forming the oxide film forming part, forming an oxide film on the surface of each of the plurality of strands constituting the flat conductor by performing a heat treatment on the flat conductor, and forming the oxide film, the rectangular An insulating layer forming part for forming an insulating layer on the outer periphery of the conductor. The oxide film forming part forms the oxide film on the surface of each of the plurality of strands while constraining at least one of the outer peripheral surfaces of the rectangular conductor.

  The method for producing a collective conducting wire according to the present invention includes a step of twisting a plurality of strands to form a stranded wire, and a step of compressing the outer periphery of the stranded wire to form a rectangular conductor having a rectangular cross section. Applying a heat treatment to the rectangular conductor to form an oxide film on the surface of each of the plurality of strands constituting the rectangular conductor; and after forming the oxide film, an insulating layer is formed on an outer periphery of the rectangular conductor. Forming a step. When forming the oxide film, the oxide film is formed on the surface of each of the plurality of strands while restraining at least one of the outer peripheral surfaces of the rectangular conductor.

  In the present invention, when an oxide film is formed on the surface of each of the plurality of strands constituting the rectangular conductor, at least one of the outer peripheral surfaces of the rectangular conductor is constrained on the surface of each strand. An oxide film is formed. Therefore, the flat conductor can be prevented from being twisted by the heat treatment in forming the oxide film, and the flat conductor can be prevented from being twisted inside the forming die for forming the insulating layer. Therefore, the insulating layer can be uniformly formed on the outer periphery of the flat conductor.

  According to the present invention, it is possible to provide an assembly conductor manufacturing apparatus and an assembly conductor manufacturing method capable of uniformly forming an insulating layer on the outer periphery of a flat conductor.

It is a figure for demonstrating the outline | summary of the assembly lead wire manufacturing apparatus concerning Embodiment 1. FIG. FIG. 3 is a cross-sectional view showing an example of a strand group used in the assembly conductor manufacturing apparatus according to the first embodiment. FIG. 3 is a plan view showing an example of a stranded wire formed by the collective conducting wire manufacturing apparatus according to the first embodiment. 3 is a cross-sectional view showing an example of a flat conductor formed by the collective conducting wire manufacturing apparatus according to Embodiment 1. FIG. It is sectional drawing which shows the state which restrains one outer peripheral surface of a flat conductor using a restraint means. It is a side view which shows an example of the oxide film formation part with which the assembly lead wire manufacturing apparatus concerning Embodiment 1 is provided. It is a perspective view which shows an example of the roll with which the oxide film formation part shown in FIG. 6 is provided. It is sectional drawing which shows an example of the roll with which the oxide film formation part shown in FIG. 6 is provided. It is sectional drawing which shows an example of the insulating layer formation part with which the assembly lead wire manufacturing apparatus concerning Embodiment 1 is provided. It is sectional drawing in the cutting | disconnection line XX of the insulating layer formation part shown in FIG. FIG. 3 is a cross-sectional view showing an example of a collective conducting wire formed using the collective conducting wire manufacturing apparatus according to the first embodiment. It is a figure for demonstrating the subject of this invention, and is a figure for demonstrating the state of the cross section of the flat conductor before and behind oxide film formation. It is a graph which shows the relationship between the position of a flat conductor, and the twist angle in the case where a flat conductor is heated and the case where it is not heated. It is a graph which shows the relationship between the position of a rectangular conductor, and the twist angle in the case where the tension | tensile_strength is acting on the flat conductor, and the case where it is not working. It is a graph which shows the relationship between the tension | tensile_strength which acts on a flat conductor, and a twist angle in the case where a flat conductor is heated and the case where it is not heated. It is a figure for demonstrating the subject of this invention, and is sectional drawing for demonstrating the state in which the flat conductor is twisted inside the shaping | molding die for forming an insulating layer. It is sectional drawing which shows the assembly conducting wire in which the insulating layer was formed in the state in which the flat conductor is twisted. It is a perspective view which shows the other example of the roll with which the oxide film formation part shown in FIG. 6 is provided. It is sectional drawing which shows the other example of the roll with which the oxide film formation part shown in FIG. 6 is provided. It is sectional drawing which shows the state which restrains two outer peripheral surfaces which a rectangular conductor mutually opposes using a restraint means. It is a side view which shows an example of the oxide film formation part with which the assembly lead wire manufacturing apparatus concerning Embodiment 2 is provided. It is a side view which shows the other example of the oxide film formation part with which the assembly lead wire manufacturing apparatus concerning Embodiment 2 is provided. It is sectional drawing for demonstrating the case where a horizontal force acts on a flat conductor. It is sectional drawing which shows an example of the oxide film formation part with which the assembly lead wire manufacturing apparatus concerning Embodiment 3 is provided. It is sectional drawing which shows an example of the oxide film formation part with which the assembly conductor manufacturing apparatus concerning Embodiment 3 is provided (when there exists a flat conductor). It is sectional drawing for demonstrating the case where a horizontal force acts on a flat conductor. It is sectional drawing which shows the other example of the oxide film formation part with which the assembly conductor manufacturing apparatus concerning Embodiment 3 is provided (when there exists a flat conductor).

<Embodiment 1>
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram for explaining the outline of the assembly conductor manufacturing apparatus 1 according to the first embodiment. As shown in FIG. 1, the assembly conductor manufacturing apparatus 1 according to the present embodiment includes a stranded wire forming part 10, a forming part 13, an oxide film forming part 14, and an insulating layer forming part 15.

  In the assembly conductor manufacturing apparatus 1 according to the present embodiment, a plurality of strands 20 are twisted together in the stranded wire forming unit 10 to form a stranded wire 25, and the outer periphery of the stranded wire 25 is compressed in the forming unit 13 to have a cross-sectional shape Forms a rectangular conductor 30 having a rectangular shape. Furthermore, heat treatment is performed on the rectangular conductor 30 in the oxide film forming unit 14 to form an oxide film on each surface of the plurality of strands constituting the rectangular conductor 30, and the rectangular after the oxide film is formed in the insulating layer forming unit 15. An insulating layer is formed on the outer periphery of the conductor 37 to form a collective conducting wire 38. The assembly conductor manufacturing apparatus 1 according to the present embodiment continuously connects each of a plurality of strands 20 (hereinafter also referred to as strand group 20), a stranded wire 25, a rectangular conductor 30, and a rectangular conductor 37 after forming an oxide film. The collective conducting wire 38 is formed while being conveyed. In this specification, the collective conducting wire 38 means a conducting wire in which an insulating layer 52 is formed on the outer periphery of the flat conductor 37 after the oxide film is formed (see FIG. 11).

  The stranded wire forming unit 10 twists the strand group 20 to form a stranded wire 25. Each strand which comprises the strand group 20 can be comprised using metal materials, such as copper. FIG. 2 is a cross-sectional view showing an example of the wire group 20. As shown in FIG. 2, the strand group 20 includes a strand 21 disposed at the center and a plurality of strands 22 disposed around the strand 21. Note that the configuration of the strand group 20 shown in FIG. 2 is an example, and the cross-sectional shape and the number of strands constituting the strand group can be arbitrarily changed.

  The stranded wire forming unit 10 includes clamps 11_1 and 11_2 and a rotating machine 12. The clamps 11_1 and 11_2 clamp the strand group 20 that has been transported. In the state where the strand group 20 is clamped using the clamps 11_1 and 11_2, the rotating machine 12 twists the central portion of the strand group 20 around the central axis of the strand group and twists the strand group 20 together. . FIG. 3 is a plan view showing an example of the stranded wire 25 formed by the stranded wire forming unit 10. As shown in FIG. 3, the stranded wire 25 includes end portions 26 </ b> _ <b> 1, 26 </ b> _ <b> 2, a center portion 27, a left-handed portion 28, and a right-handed portion 29. The end portion 26_1 corresponds to a portion clamped by the clamp 11_1, the end portion 26_2 corresponds to a portion clamped by the clamp 11_2, and the central portion 27 corresponds to a portion twisted by the rotating machine 12. .

  That is, when the end portion 26_1 is clamped by the clamp 11_1 and the end portion 26_2 is clamped by the clamp 11_2, the central portion 27 is viewed from the downstream side in the conveying direction (that is, the molding portion 13 side) using the rotating machine 12. By twisting counterclockwise, the left-handed portion 28 and the right-handed portion 29 in which the strand group 20 is twisted can be formed. The left-handed portion 28 is twisted counterclockwise when viewed from the downstream side in the transport direction. The right-handed portion 29 is twisted clockwise as viewed from the downstream side in the transport direction. Since the end portions 26_1 and 26_2 of the stranded wire 25 and the central portion 27 are not twisted, the strands constituting the strand group 20 are parallel to each other. The cross-sectional shape of the stranded wire 25 is substantially the same as the cross-sectional shape of the strand group 20 shown in FIG.

  3 shows the stranded wire 25 when the central portion 27 is twisted counterclockwise when viewed from the downstream side in the transport direction using the rotating machine 12, but the direction in which the central portion 27 is twisted using the rotating machine 12 is shown. It may be reversed (that is, clockwise when viewed from the downstream side in the transport direction).

  The molded part 13 compresses the outer periphery of the stranded wire 25 to form a rectangular conductor 30 having a rectangular cross-sectional shape. FIG. 4 is a cross-sectional view illustrating an example of the flat conductor 30 formed by the molding portion 13. As shown in FIG. 4, the flat conductor 30 includes an element wire 31 (corresponding to the element wire 21 in FIG. 2) disposed in the center and a plurality of element wires 32 (FIG. 2) disposed around the element wire 31. Corresponding to the element wire 22). Further, the flat conductor 30 includes outer peripheral surfaces 33 to 36. The cross-sectional shape of the flat conductor 30 shown in FIG. 4 is an example, and the width and height of the cross section of the flat conductor can be arbitrarily changed.

  The forming unit 13 includes, for example, a first rolling roll (not shown) that forms the outer peripheral surface 33 and the outer peripheral surface 34 of the flat conductor 30, and a second roll that forms the outer peripheral surface 35 and the outer peripheral surface 36 of the flat conductor 30. Rolling rolls (not shown). And the outer peripheral surface 33 and the outer peripheral surface 34 are formed by compressing the up-down direction of the cross section of the twisted wire 25 using a 1st rolling roll. Moreover, the outer peripheral surface 35 and the outer peripheral surface 36 are formed by compressing the left-right direction of the cross section of the strand 25 using a 2nd rolling roll.

  The oxide film forming unit 14 heat-treats the rectangular conductor 30 to form an oxide film on the surface of each of the plurality of strands 31 and 32 constituting the rectangular conductor 30. That is, since each strand 31 and 32 which comprises the flat conductor 30 is comprised with the metal material, a metal oxide film is formed in the surface of each strand 31 and 32 by heat-treating the flat conductor 30 Is done. For example, when each strand 31 and 32 is configured using copper, copper oxide is formed as an oxide film. Thus, by forming an oxide film on the surface of each of the strands 31 and 32 constituting the rectangular conductor 30, the insulation between the strands can be improved.

  In this embodiment, when forming the oxide film, the oxide film is formed on the surface of each of the plurality of strands while restraining at least one of the outer peripheral surfaces of the flat conductor 30. That is, as shown in FIG. 5, the oxide film forming portion 14 has a restraining means 40 that constrains the outer peripheral surface 33 that is one of the outer peripheral surfaces of the flat conductor 30. An oxide film is formed on the surface of each of the plurality of strands 31 and 32 while the outer peripheral surface 33 of the conductor 30 is restrained by the restraining means 40.

  FIG. 6 is a side view showing an example of the oxide film forming unit 14 provided in the assembly conductor manufacturing apparatus 1 according to the present embodiment. As shown in FIG. 6, the oxide film forming unit 14 includes a heating furnace 41 and a roll 42. The roll 42 is accommodated in a heating furnace 41 and is configured to be rotatable around a rotation shaft 43. The inside of the heating furnace 41 is maintained at a temperature at which an oxide film can be formed on the surfaces of the strands 31 and 32 constituting the flat conductor 30.

  FIG. 7 is a perspective view showing an example of a roll 42 provided in the oxide film forming unit 14 shown in FIG. FIG. 8 is a cross-sectional view (a cross-sectional view taken along a cutting line including the rotation shaft 43 of the roll 42) showing an example of the roll 42 provided in the oxide film forming unit 14 shown in FIG. As shown in FIG. 7, the flat conductor 30 is wound around the outer peripheral surface of the roll 42. And the roll 42 rotates centering on the rotating shaft 43, the flat conductor 30 introduced into the oxide film formation part 14 is heat-processed one by one, and the flat conductor 37 in which the oxide film was formed is formed. At this time, as shown in FIG. 8, the outer circumferential surface 33 of the flat conductor 30 is in contact with the outer circumferential surface 44 of the roll 42. Therefore, an oxide film can be formed on the surface of each of the strands 31 and 32 constituting the flat conductor 30 while restraining the outer peripheral face 33 of the flat conductor 30 with the outer peripheral face 44 of the roll 42.

  The insulating layer forming portion 15 shown in FIG. 1 forms an insulating wire 38 (see FIG. 11) by forming an insulating layer on the outer periphery of the rectangular conductor 37 after the oxide film is formed. FIG. 9 is a cross-sectional view (a cross-sectional view along the conveyance direction of the flat conductor) showing an example of the insulating layer forming portion 15. 10 is a cross-sectional view of the insulating layer forming portion 15 shown in FIG. As shown in FIGS. 9 and 10, the insulating layer forming portion 15 includes a mold 51. The forming die 51 has a hollow shape extending in the conveying direction of the flat conductor 37, and the flat conductor 37 is disposed in the hollow portion 53 of the forming die 51. The cross-sectional shape of the hollow portion 53 is rectangular. The hollow portion 53 of the mold 51 is filled with a resin material for forming the insulating layer 52. That is, the insulating layer 52 is formed on the outer periphery of the flat conductor 37 by passing the flat conductor 37 through the hollow portion 53 of the mold 51 filled with the resin material 52.

  Note that the insulating layer forming portion 15 shown in FIGS. 9 and 10 is an example, and in the present embodiment, the insulating layer forming portion 15 having a configuration other than this may be used. In addition, the material for forming the insulating layer 52 is not limited to the resin material, and other materials (for example, enamel materials) may be used as long as the materials have insulating properties.

  By using the assembly conductor manufacturing apparatus and the assembly conductor manufacturing method according to the present embodiment described above, the assembly conductor 38 in which the insulating layer 52 is disposed on the outer periphery of the flat conductor 37 as shown in FIG. 11 is formed. be able to.

  In the collective conducting wire manufacturing apparatus and the collective conducting wire manufacturing method according to the present embodiment, when the flat conductor 30 is subjected to a heat treatment to form an oxide film, at least one outer peripheral face of the flat conductor is used. Restrained. Therefore, the flat conductor 30 can be prevented from being twisted by the heat treatment when forming the oxide film, so that the flat conductor 37 is twisted inside the forming die 51 (see FIG. 10) for forming the insulating layer 52. Can be suppressed. Therefore, the insulating layer 52 can be uniformly formed on the outer periphery of the flat conductor 37.

  As described in the background art, in the technique disclosed in Patent Document 1, a plurality of strands covered with an oxide film are twisted to form a stranded wire, and then the stranded wire is compression-molded. A rectangular conductor having a rectangular cross-sectional shape is formed. However, if a stranded wire is compression-molded when forming a flat conductor, the oxide film on the surface of each strand constituting the stranded wire is destroyed, and insulation between the strands cannot be maintained. It was. In order to solve such a problem, after forming a rectangular conductor by compression-molding a stranded wire, a heat treatment process (oxide film forming process) in which the rectangular conductor is heat-treated to form an oxide film on the surface of each strand. ) Is required.

  However, when heat treatment is performed after the flat conductor is formed, the strands of the individual wires constituting the flat conductor are returned, and the flat conductor is twisted. For this reason, when an insulating layer made of resin or the like is formed on the outer periphery of the flat conductor, the flat conductor is twisted inside the mold for forming the insulating layer, and the insulating layer is uniformly formed on the outer periphery of the flat conductor. There was a problem that could not be done.

  That is, as shown in the upper diagram of FIG. 12, before the oxide film is formed (that is, before heat treatment), the cross-sectional shape of the rectangular conductor 30 (that is, before the heat treatment) The relative twist angle of the cross section at each position of the flat conductor 30 is substantially constant. The pitch angle of the left-handed portion 28 of the flat conductor 30 at this time is defined as θ1. On the other hand, when heat treatment is performed without restricting the outer peripheral surface of the rectangular conductor 137 to form an oxide film, as shown in the lower diagram of FIG. The conductor 137 is twisted. That is, the twist of each strand returns near the central portion 27 of the flat conductor 137, and the central portion 27 of the flat conductor 137 rotates rightward as viewed from the downstream side in the transport direction. For this reason, the flat conductor 137 is twisted in the vicinity of the central portion 27 of the flat conductor 137 (the twist angle of the flat conductor 137 is α). At this time, the pitch angle of the left-handed portion 28 of the flat conductor 137 is θ2, which is smaller than the pitch angle θ1 before the heat treatment.

  Further, as shown in the lower diagram of FIG. 12, in the rectangular conductor 137 after the oxide film is formed, a portion where the twist of the rectangular conductor 137 is large (near the center portion 27) and a portion where the twist is small (near the end portions 26_1, 26_2) are formed. In the same rectangular conductor 137, the twist angle varies.

  FIG. 13 is a graph showing the relationship between the position of the flat conductor 137 and the twist angle when the flat conductor 137 is heated and when it is not heated. As shown in FIG. 13, when the flat conductor 137 is heated, the twist angle α of the flat conductor 137 is larger than when the flat conductor 137 is not heated. In particular, the twist angle α increases near the central portion 27 of the flat conductor 137.

  FIG. 14 is a graph showing the relationship between the position of the flat conductor 137 and the twist angle when tension is applied to the flat conductor 137 and when it is not working. As shown in FIG. 14, when the tension is applied to the flat conductor 137, the twist angle α of the flat conductor 137 is larger than when the tension is not applied to the flat conductor 137. In particular, the twist angle α increases near the central portion 27 of the flat conductor 137.

  FIG. 15 is a graph showing the relationship between the tension acting on the flat conductor 137 and the twist angle (twist angle near the central portion 27) when the flat conductor 137 is heated and not heated. As shown in FIG. 15, the twist angle α of the flat conductor 137 increases as the tension acting on the flat conductor 137 increases both when the flat conductor 137 is heated and when it is not heated. In particular, when the flat conductor 137 is heated, the increase amount of the twist angle α of the flat conductor 137 increases.

  As described above, when the oxide film is formed after the flat conductor 137 is formed (that is, when heat treatment is performed), heat and tension are applied to the flat conductor 137, so that each strand constituting the flat conductor 137 Twisting returns and the rectangular conductor 137 is twisted (see the lower diagram of FIG. 12). If the flat conductor 137 is twisted after the oxide film is formed in this way, as shown in FIG. 16, the flat conductor 137 is twisted inside the mold 51 for forming the insulating layer 52, and the outer periphery of the flat conductor 137 is formed. Insulating layer 52 cannot be formed uniformly. In this case, the formed collective conducting wire includes the collective conducting wire 138 having a cross-sectional shape as shown in FIG. For this reason, the insulating layer 52 at the corners of the flat conductor 137 becomes thin (indicated by a broken line in FIG. 17), and there is a problem that the insulating property of the collective conducting wire cannot be maintained.

  Therefore, in the present embodiment, when the rectangular conductor 30 is heat-treated to form an oxide film, the oxide film is formed on the surface of each strand while restraining at least one of the outer peripheral surfaces of the rectangular conductor. Forming. Therefore, the flat conductor 30 can be prevented from being twisted by heat treatment when forming the oxide film, and the flat conductor 37 is twisted inside the forming die 51 (see FIG. 10) for forming the insulating layer 52. Can be suppressed. Therefore, the insulating layer 52 can be uniformly formed on the outer periphery of the rectangular conductor 37.

  Further, the invention according to the present embodiment can suppress the twisting of the rectangular conductor 30, so that the cross-sectional shape of the formed assembly conductor 38 can be made uniform (that is, the twisting of the rectangular conductor 38 is performed). The angle α can be within a predetermined error range). Therefore, for example, when the collective conducting wire 38 is used as a motor coil, the collective conducting wire 38 can be arranged in the motor without any gap.

  In the present embodiment, for example, as shown in FIG. 7, the rectangular conductor 30 is wound around the outer peripheral surface of the roll 42, and the roll 42 is rotated around the rotation shaft 43, thereby introducing the oxide film forming unit 14. The flat rectangular conductors 30 are sequentially heat-treated. Thus, by winding the rectangular conductor 30 around the outer peripheral surface of the roll 42, it is possible to suppress the tension from acting on the wound rectangular conductor 30, and to suppress the twisting of the rectangular conductor 30 more effectively. be able to.

  On the other hand, when the cylindrical roll 42 shown in FIG. 7 is used, the flat conductor 30 wound around the outer peripheral surface of the roll 42 extends due to heat, and the gap between the outer peripheral surface of the roll 42 and the flat conductor 42 is increased. There may be a gap. In this case, the restraining force on the flat conductor 42 is weakened. This problem is caused by the difference between the linear expansion coefficient of the rectangular conductor 30 and the linear expansion coefficient of the roll 42. In particular, this problem is a problem that appears prominently near the end of winding of the rectangular conductor 30 (that is, downstream in the transport direction).

  In order to solve such a problem, in the present embodiment, a tape-shaped roll 45 as shown in the perspective view of FIG. 18 may be used as the roll included in the oxide film forming unit 14. That is, the roll 45 has a taper shape in which the circumference of the outer periphery of the roll 45 gradually increases from the start to the end of winding of the rectangular conductor 30. Here, the winding start of the flat conductor 30 is on the upstream side in the transport direction (the side where the flat conductor 30 is introduced), and the winding end of the flat conductor 30 is on the downstream side in the transport direction (the flat conductor 37 on which the oxide film is formed). Side).

  Also in this case, the flat rectangular conductor 30 is wound around the outer peripheral surface of the roll 45. The roll 45 rotates about the rotation shaft 46, whereby the rectangular conductors 30 introduced into the oxide film forming unit 14 are sequentially heat-treated, and the rectangular conductors 37 on which the oxide film is formed are continuously formed. . At this time, the outer peripheral surface 33 of the flat rectangular conductor 30 is in contact with the outer peripheral surface 47 of the roll 45 as shown in the cross-sectional view of FIG. Therefore, an oxide film can be formed on the surfaces of the strands 31 and 32 constituting the flat conductor 30 while restraining the outer peripheral surface 33 of the flat conductor 30 with the outer peripheral surface 47 of the roll 45. For example, the circumferential length of the roll 45 can be increased in accordance with the extension due to the thermal expansion of the flat conductor 30.

  Moreover, when using the cylindrical roll 42 as shown in FIG. 7, you may make it comprise the roll 42 and the flat conductor 30 using the same material, for example. Thus, by using the same material for the roll 42 and the flat conductor 30, the linear expansion coefficients of the roll 42 and the flat conductor 30 can be made uniform, and the outer peripheral surface of the roll 42 and the flat conductor 42 can be aligned. The problem that a gap is formed between the two can be solved. At this time, for example, the roll 42 may be made of a material having a larger linear expansion coefficient than the material constituting the flat conductor 30. For example, when copper is used as the material of the flat conductor 30, an aluminum alloy can be used as the material constituting the roll 42.

  By the invention according to the present embodiment described above, it is possible to provide a collective conductor manufacturing apparatus and a collective conductor manufacturing method capable of uniformly forming an insulating layer on the outer periphery of a flat conductor.

<Embodiment 2>
Next, a second embodiment of the present invention will be described. In the present embodiment, when the oxide film is formed in the oxide film forming unit 14 shown in FIG. 1, the two outer peripheral surfaces facing each other among the outer peripheral surfaces of the flat conductor 30 are constrained, and The case where an oxide film is formed on the surface will be described. Except for this, the assembly conductor manufacturing apparatus and the assembly conductor manufacturing method described in the first embodiment are the same as those in the first embodiment, and a duplicate description is omitted.

  As shown in FIG. 20, in this embodiment, the oxide film forming unit 14 restrains the restraining means 61 that restrains the outer peripheral surface 33 of the flat conductor 30 and the outer peripheral surface 34 that faces the outer peripheral surface 33 of the flat conductor 30. And a restraining means 62. When forming the oxide film, the outer peripheral surface 33 and the outer peripheral surface 34 of the rectangular conductor 30 are restrained by the restraining means 61 and the restraining means 62, respectively, and the oxide film is formed on the surfaces of the plurality of strands 31 and 32. Is forming.

  FIG. 21 is a side view showing an example of the oxide film forming unit 14 provided in the assembly conductor manufacturing apparatus 1 according to the present embodiment. As shown in FIG. 21, the oxide film forming unit 14 'includes a heating furnace 41, a main roll 65, and auxiliary rolls 66_1 to 66_4. The main roll 65 and the auxiliary rolls 66_1 to 66_4 are accommodated in the heating furnace 41. Further, each of the main roll 65 and the auxiliary rolls 66_1 to 66_4 is configured to be rotatable about a rotation axis. The inside of the heating furnace 41 is maintained at a temperature at which an oxide film can be formed on the surfaces of the strands 31 and 32 constituting the flat conductor 30.

  One outer peripheral surface 33 (see FIG. 20) of the flat conductor 30 is in contact with the outer peripheral surface of the main roll 65. The other outer circumferential surface 34 (see FIG. 20) of the flat conductor 30 is in contact with the outer circumferential surface of each of the auxiliary rolls 66_1 to 66_4. That is, in the oxide film forming portion 14 ′ shown in FIG. 21, the rectangular conductor 30 is in a state where one outer peripheral surface 33 is in contact with the outer peripheral surface of the main roll 65, and the other outer peripheral surface 34 is the auxiliary roll 66_1. 66_4 is conveyed in contact with the outer peripheral surface of each of 66_4. Therefore, an oxide film can be formed on the surface of each of the plurality of strands while restraining the two outer peripheral surfaces 33 and 34 facing each other of the flat conductor 30.

  In this way, when forming the oxide film, by constraining two outer peripheral surfaces facing each other among the outer peripheral surfaces of the flat conductor 30, the rectangular conductor 30 is more constrained than when only one outer peripheral surface of the flat conductor 30 is constrained. Can be effectively suppressed.

  FIG. 21 illustrates the case where the number of auxiliary rolls 66_1 to 66_4 included in the oxide film forming unit 14 'is four. However, in this embodiment, the number of auxiliary rolls can be any number (1) as long as an oxide film can be formed while restraining the outer peripheral surfaces 33 and 34 of the rectangular conductor 30 with the main roll and the auxiliary roll. Or more).

  FIG. 22 is a side view showing another example of the oxide film forming unit 14 provided in the assembly conductor manufacturing apparatus 1 according to the present embodiment. As shown in FIG. 22, the oxide film forming unit 14 ″ includes a first caterpillar 71 and a second caterpillar 72. The first caterpillar 71 includes rolls 73_1 and 73_2 disposed so as to be adjacent to each other, and a first drive belt 74 disposed on the outer periphery of the rolls 73_1 and 73_2. The first drive belt 74 is configured to rotate in conjunction with the rotation of the rolls 73_1 and 73_2. In addition, the first drive belt 74 is heated to a temperature at which an oxide film can be formed on the surface of each wire constituting the flat conductor 30. The first drive belt 74 can be configured using, for example, a metal material.

  Similarly, the second caterpillar 72 includes rolls 75_1 and 75_2 disposed so as to be adjacent to each other, and a second drive belt 76 disposed on the outer periphery of the rolls 75_1 and 75_2. The second drive belt 76 is configured to rotate in conjunction with the rotation of the rolls 75_1 and 75_2. Further, the second drive belt 76 is heated to a temperature at which an oxide film can be formed on the surface of each wire constituting the flat conductor 30. The second drive belt 76 can be configured using, for example, a metal material.

  One outer peripheral surface 33 of the flat conductor 30 is in contact with the outer peripheral surface of the first drive belt 74 provided in the first caterpillar 71. The other outer circumferential surface 34 of the flat conductor 30 is in contact with the outer circumferential surface of the second drive belt 76 provided in the second caterpillar 72. That is, in the oxide film forming portion 14 '' shown in FIG. 22, the flat conductor 30 has one outer peripheral surface 33 in contact with the outer peripheral surface of the first drive belt 74 included in the first caterpillar 71, and The other outer peripheral surface 34 is conveyed in a state of being in contact with the outer peripheral surface of the second drive belt 76 provided in the second caterpillar 72. In other words, the oxide film forming portion 14 ″ conveys the rectangular conductor 30 while being sandwiched between the first drive belt 74 and the second drive belt 76.

  Therefore, the oxide film forming portion 14 ″ restrains the two outer peripheral surfaces 33 and 34 of the flat conductor 30 facing each other by using the first and second drive belts 74 and 76, and performs the first and second driving. Since the flat conductor 30 can be heated using the belts 74 and 76, an oxide film can be formed on the flat conductor 30 while preventing the flat conductor 30 from being twisted.

  For example, when an oxide film is formed using the oxide film forming portion 14 ′ shown in FIG. 21, since the radiant heat is used when heating the rectangular conductor 30, the rectangular conductor 30 is directly heated (heating by heat transfer). ), The amount of heat required for heating the rectangular conductor 30 is larger. In addition, since a plurality of rolls (main roll 65 and auxiliary rolls 66_1 to 66_4) are arranged in the heating furnace 41, heat is taken away by the plurality of rolls. As described above, when the oxide film forming portion 14 ′ shown in FIG. 21 is used, there is a problem that energy required for forming the oxide film on the flat conductor 30 becomes large.

  On the other hand, in the oxide film forming portion 14 '' shown in FIG. 22, the first drive belt 74 provided in the first caterpillar 71 and the first drive belt 76 provided in the second caterpillar 72 are used. The flat conductor 30 is directly heated. Therefore, the energy at the time of forming an oxide film on the flat conductor 30 can be reduced.

<Embodiment 3>
Next, a third embodiment of the present invention will be described.
In the assembly conductor manufacturing apparatus and the assembly conductor manufacturing method described in the first embodiment, as shown in the sectional view of FIG. 23, only one outer peripheral surface 33 of the rectangular conductor 30 is constrained to form an oxide film. . In this case, since both side surfaces of the rectangular conductor 30 are not constrained, when a lateral force (indicated by an arrow) acts on the rectangular conductor, the rectangular conductor 30 is deformed as indicated by a broken line in FIG. There was a case.

  In the present embodiment, in order to solve such a problem, as shown in FIG. 24, a groove 82 is formed on the outer peripheral surface of the roll 80 at a position corresponding to the position where the flat conductor 30 is wound. The roll 80 shown in FIG. 24 corresponds to the roll 42 shown in FIGS. 7 and 8 and is the same as the roll 42 shown in FIGS. The description which was made is abbreviate | omitted.

  Thus, by forming the groove portion 82 on the outer peripheral surface of the roll 80, the outer peripheral surface 33 of the flat conductor 30 is constrained by the bottom surface of the groove portion 82 as shown in the sectional view of FIG. The oxide film can be formed while restraining the side surfaces 35 and 36 with the side surface of the groove 82. Therefore, the deformation | transformation (refer FIG. 23) of the falling direction of a flat conductor can be suppressed.

  In particular, the problem described above is noticeable when a tapered roll 45 as shown in the cross-sectional view of FIG. 26 is used. That is, when the taper-shaped roll 45 is used, the outer peripheral surface of the roll 45 is inclined, so that the flat conductor 30 disposed on the outer peripheral surface of the roll 45 has a force in the direction indicated by the arrow in FIG. Work.

  In the present embodiment, in order to solve such a problem, as shown in FIG. 27, a groove portion 87 is formed on the outer peripheral surface of the tapered roll 85 at a position corresponding to the position where the rectangular conductor 30 is wound. Yes. The roll 85 shown in FIG. 27 corresponds to the roll 45 shown in FIG. 18 and FIG. 19 and is the same as the roll 45 shown in FIG. 18 and FIG. The description which was made is abbreviate | omitted.

  Thus, by forming the groove portion 87 on the outer peripheral surface of the roll 85, the outer peripheral surface 33 of the flat conductor 30 is constrained by the bottom surface of the groove portion 87, and both side surfaces 35 and 36 of the flat conductor 30 are Since the oxide film can be formed while restraining, deformation of the flat conductor in the falling direction can be suppressed.

  Although the present invention has been described with reference to the above embodiment, the present invention is not limited to the configuration of the above embodiment, and those skilled in the art within the scope of the invention of the claims of the present application claims. It goes without saying that various modifications, modifications, and combinations that can be made are included.

DESCRIPTION OF SYMBOLS 1 Collective conductor manufacturing apparatus 10 Twisted wire formation part 11_1, 11_2 Clamp 12 Rotating machine 13 Molding part 14 Oxide film formation part 15 Insulating layer formation part 20 Strand group (plural strands)
21, 22 Strand 25 Stranded wire 26_1, 26_2 End 27 Central part 28 Left-handed part 29 Right-handed part 30 Flat conductor (before oxide film formation)
31, 32 Wires 33, 34, 35, 36 Outer peripheral surface 37 Flat conductor (after oxide film formation)
38 Collective conducting wire 40 Restraint means 41 Heating furnace 42 Roll 43 Rotating shaft 44 Outer peripheral surface 45 Roll (tapered)
46 Rotating shaft 47 Outer peripheral surface 51 Mold 52 Insulating layer (resin material)
53 hollow portions 61, 62 restraining means 65 main roll 66_1-66_4 auxiliary roll 71 first caterpillar 72 second caterpillar 73_1, 73_2 roll 74 first drive belt 75_1, 75_2 roll 76 second drive belt 80 roll 82 groove 85 rolls (tapered)
87 Groove

Claims (9)

A stranded wire forming section that twists a plurality of strands to form a stranded wire;
A molded part that compresses the outer periphery of the stranded wire to form a rectangular conductor having a rectangular cross-sectional shape;
An oxide film forming portion that heat-treats the flat conductor and forms an oxide film on the surface of each of the plurality of strands constituting the flat conductor;
After forming the oxide film, comprising an insulating layer forming portion for forming an insulating layer on the outer periphery of the rectangular conductor,
The oxide film forming portion forms the oxide film on the surface of each of the plurality of strands while constraining at least one of the outer peripheral surfaces of the rectangular conductor.
Collective conductor manufacturing equipment. The oxide film forming portion includes a roll rotatable around a rotation axis,
The assembly conductor manufacturing apparatus according to claim 1, wherein the rectangular conductor is wound around an outer peripheral surface of the roll, and the rectangular conductor is heated while the one outer peripheral surface of the flat conductor is in contact with the outer peripheral surface of the roll.   3. The assembly conductor manufacturing apparatus according to claim 2, wherein the roll has a tapered shape such that a circumference of the outer circumference of the roll gradually increases from a winding start to a winding end of the rectangular conductor.   Grooves are formed at positions corresponding to positions where the flat conductor is wound on the outer peripheral surface of the roll, and the oxide film is formed while restraining both side surfaces of the outer peripheral surface of the flat conductor with the side surfaces of the groove portions. The collective conducting wire manufacturing apparatus according to claim 2 or 3.   2. The collective conducting wire according to claim 1, wherein the oxide film forming portion forms the oxide film on each surface of the plurality of strands while constraining two outer peripheral surfaces facing each other among the outer peripheral surfaces of the rectangular conductor. manufacturing device. The oxide film forming portion includes a main roll and an auxiliary roll that can rotate around a rotation axis,
One of the two outer peripheral surfaces facing each other of the flat conductor is brought into contact with the outer peripheral surface of the main roll, and the outer peripheral surface of the auxiliary roll is made of the two outer peripheral surfaces of the flat conductor facing each other. Heating the rectangular conductor while contacting the other surface;
The assembly conductor manufacturing apparatus according to claim 5. The oxide film forming portion includes a first caterpillar including a first drive belt, and a second caterpillar including a second drive belt,
One of the two outer peripheral surfaces facing each other of the flat conductor is brought into contact with the first drive belt, and the other of the two outer peripheral surfaces facing each other of the flat conductor is the second. In contact with the drive belt, transporting while holding the rectangular conductor with the first and second drive belts, and heating the flat conductor by heating the first and second drive belts,
The assembly conductor manufacturing apparatus according to claim 5. A step of twisting a plurality of strands to form a stranded wire;
Compressing the outer periphery of the stranded wire to form a rectangular conductor having a rectangular cross-sectional shape;
Applying a heat treatment to the flat conductor to form an oxide film on the surface of each of the plurality of strands constituting the flat conductor;
Forming an insulating layer on the outer periphery of the rectangular conductor after forming the oxide film, and
When forming the oxide film, forming the oxide film on the surface of each of the plurality of strands while constraining at least one of the outer peripheral surfaces of the rectangular conductor.
A manufacturing method of the assembly conductor.   9. The assembly according to claim 8, wherein when forming the oxide film, the oxide film is formed on each surface of the plurality of strands while constraining two outer peripheral surfaces facing each other out of the outer peripheral surfaces of the rectangular conductor. A method of manufacturing a conductor.

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