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JP-7854915-B2 - Method of joining a connecting member to a conductor of an insulated electric wire.

JP7854915B2JP 7854915 B2JP7854915 B2JP 7854915B2JP-7854915-B2

Inventors

  • 西野 史香
  • 野上 祐介
  • 村山 太郎
  • 茅原 崇
  • 大前 瑞姫
  • 園田 貴大

Assignees

  • 古河電気工業株式会社
  • 株式会社アイシン

Dates

Publication Date
20260507
Application Date
20221012

Claims (18)

  1. A first step involves fixing the insulated wire and the connecting member by crimping the connecting member so that the opening narrows, with the end of the insulated wire protruding from the connecting member, through an opening provided in the connecting member made of a conductive metal material, and the end of the insulated wire protruding from the connecting member. A second step involves irradiating the insulating coating of the end fixed to the connecting member in the first step with a laser beam from the opposite side of the connecting member, scanning the insulating coating in a circular motion along the end, and blowing an oxygen-containing gas onto the end to remove the insulating coating from the end; A third step is performed after the second step, in which a laser beam is continuously irradiated onto the conductor at the end from the opposite side of the connecting member to melt the conductor and form a molten pool. A fourth step is to expand the molten pool by irradiating the connecting member with laser light while scanning it in a circular motion, following the third step described above. A fifth step is to cool and solidify the molten pool after the fourth step, A method for joining a connecting member and a conductor of an insulated wire, comprising the following:
  2. The method for joining a connecting member and a conductor of an insulated wire according to claim 1, wherein in the second step, laser light divided into multiple beams is irradiated as the laser light.
  3. The second step includes multiple circular irradiations in which a laser beam is irradiated while scanning in a circular motion at least once, as described in claim 1 or 2, for joining a connecting member and a conductor of an insulated wire.
  4. The method for joining a connecting member and a conductor of an insulated wire according to claim 3, wherein the second step includes, as the circular irradiation, a first circular irradiation and a second circular irradiation performed after the first circular irradiation, in which the laser light is irradiated at a lower power than the first circular irradiation.
  5. The method for joining a connecting member and a conductor of an insulated wire according to claim 4, wherein the laser beam is scanned at a larger radius than the first circular irradiation during the second circular irradiation.
  6. The method for joining a connecting member and a conductor of an insulated wire according to claim 3, wherein the second step includes, as the circular irradiation, a first circular irradiation and a third circular irradiation performed after the first circular irradiation, scanning the laser beam at a larger radius than the first circular irradiation.
  7. In the second step, the gas is sprayed from the opposite side of the end to the connecting member, toward multiple locations on the outer circumference of the end at different circumferential positions, as described in claim 1 or 2, for joining a connecting member to a conductor of an insulated wire.
  8. The method for joining a connecting member and an insulated wire conductor according to claim 1 or 2, wherein in the second step, the scanning speed of the laser beam spot is faster than 10 mm/s and slower than 70 mm/s, and the output of the laser beam is higher than 100 W and lower than 1200 W.
  9. The method for joining a connecting member and an insulated wire conductor according to claim 8, wherein in the second step, the scanning speed of the laser beam spot is faster than 20 [mm/s], and the output of the laser beam is higher than 200 [W] and lower than 1000 [W].
  10. The third step is to connect a connecting member to a conductor of an insulated wire, as described in claim 1 or 2, wherein the laser beam irradiation time is longer than 10 ms and shorter than 70 ms, and the laser beam output is higher than 500 W and lower than 1000 W.
  11. The third step is a method for joining a connecting member and an insulated wire conductor according to claim 10, wherein the laser light irradiation time is longer than 30 [ms] and shorter than 60 [ms], and the laser light output is higher than 700 [W].
  12. The method for joining a connecting member and a conductor of an insulated wire according to claim 1, wherein in the fourth step, laser light divided into multiple beams is irradiated as the laser light.
  13. The method for joining a connecting member and a conductor of an insulated wire according to claim 1 or 12, wherein in the fourth step, laser light is irradiated at a lower power than in the third step.
  14. The fourth step is a method for joining a connecting member and an insulated wire conductor according to claim 1 or 2, wherein the scanning speed of the laser beam spot is faster than 20 mm/s and slower than 70 mm/s, and the output of the laser beam is higher than 350 W and lower than 650 W.
  15. In the fourth step, the scanning speed of the laser beam spot is slower than 60 [mm/s], and the output of the laser beam is higher than 400 [W], as described in claim 14, for joining a connecting member to a conductor of an insulated wire.
  16. The method for joining a connecting member and a conductor of an insulated wire according to claim 1 or 12, wherein the laser beam is scanned circumferentially while wobbling in the fourth step.
  17. The method for joining a connecting member and a conductor of an insulated wire according to claim 1, further comprising a sixth step, after the fourth step and before the fifth step, of heating the molten pool formed in the fourth step by irradiating it with laser light at a lower power than that of the fourth step.
  18. The method for joining a connecting member and a conductor of an insulated wire according to claim 17, wherein in the sixth step, laser light divided into multiple beams is irradiated as the laser light.

Description

This invention relates to a method for joining a connecting member to a conductor of an insulated electric wire. Conventionally, a method is known in which the connecting member and the conductor of the electric wire are crimped together and then laser-welded (for example, Patent Documents 1 and 2). Japanese Patent Publication No. 2003-346929Japanese Patent Publication No. 2004-178872 Figure 1 is a schematic diagram illustrating an example of a laser processing apparatus according to an embodiment.Figure 2 is an explanatory diagram illustrating the concept of the principle of the diffractive optical element included in the laser processing apparatus of the embodiment.Figure 3 is a schematic diagram showing an example of a laser beam spot formed on the surface of a workpiece by the laser processing apparatus of the embodiment.Figure 4 is an illustrative flowchart showing the procedure for joining the connecting member and the conductor of an insulated wire according to the first embodiment.Figure 5 is an illustrative and schematic plan view showing the state in which an insulated electric wire is set in a predetermined position on the connecting member in the joining method of the first embodiment.Figure 6 is an illustrative and schematic plan view showing the state in the joining method of the first embodiment in which the connecting member is crimped after the state shown in Figure 5 to fix the connecting member and the insulated wire.Figure 7 is an illustrative and schematic cross-sectional view showing the state in which the tip of the end of an insulated wire is cut so that it protrudes from the connecting member by a predetermined length in the joining method of the first embodiment.Figure 8 is an exemplary and schematic cross-sectional view showing the step of removing the insulating coating from the end of an insulated wire by irradiation with laser light and blowing gas in the joining method of the first embodiment.Figure 9 is an exemplary and schematic cross-sectional view showing a step later than Figure 8 in the joining method of the first embodiment, in which the insulating coating is removed from the end of an insulated wire by laser irradiation and gas blowing.Figure 10 is an exemplary and schematic cross-sectional view showing the step in the joining method of the first embodiment in which the end of the conductor of an electric wire, from which the insulating coating has been removed by irradiation with laser light, is melted to form a molten pool.Figure 11 is an illustrative and schematic cross-sectional view showing a step later than that shown in Figure 10 in the joining method of the first embodiment, in which the end of the conductor of the electric wire from which the insulating coating has been removed by irradiation with laser light is melted to form a molten pool.Figure 12 is an illustrative and schematic cross-sectional view showing the step in the joining method of the first embodiment in which the connecting member is melted by irradiation with laser light to expand the molten pool.Figure 13 is an exemplary and schematic cross-sectional view showing the state in which the molten pool formed in the joining method of the first embodiment has been cooled and solidified.Figure 14 is an exemplary flowchart showing the procedure for joining the connecting member and the conductor of an insulated wire according to the second embodiment.Figure 15 is an exemplary and schematic cross-sectional view showing the step in the joining method of the second embodiment in which the molten pool in Figure 12 is heated by laser irradiation to remove air bubbles.Figure 16 is an exemplary and schematic plan view showing the scanning trajectory of a laser spot when wobbling scanning of the laser spot is performed in the bonding method of the third embodiment. The following describes exemplary embodiments of the present invention. The configurations of the embodiments shown below, as well as the functions and effects resulting from them, are examples only. The present invention can also be realized by configurations other than those disclosed in the following embodiments. Furthermore, according to the present invention, it is possible to obtain at least one of the various effects (including derived effects) that can be obtained by the said configuration. In each diagram, the X direction is represented by arrow X, the Y direction by arrow Y, and the Z direction by arrow Z. The X, Y, and Z directions intersect and are perpendicular to each other. The Z direction is the axial direction of the insulated wire. Furthermore, the following embodiments include similar components. Each embodiment yields similar effects based on similar components. In the following, redundant explanations of similar components and effects may be omitted. Furthermore, in this specification, ordinal numbers are assigned for convenience to distinguish processes, stages, components, etc., and do not limit priority or order. [First Embo