WO2023281930A1 - レーザ溶接装置、レーザ溶接方法及び回転電機の製造方法 - Google Patents

レーザ溶接装置、レーザ溶接方法及び回転電機の製造方法 Download PDF

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Publication number
WO2023281930A1
WO2023281930A1 PCT/JP2022/021499 JP2022021499W WO2023281930A1 WO 2023281930 A1 WO2023281930 A1 WO 2023281930A1 JP 2022021499 W JP2022021499 W JP 2022021499W WO 2023281930 A1 WO2023281930 A1 WO 2023281930A1
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Prior art keywords
electrical conductor
laser beam
laser
optical element
laser welding
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Ceased
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PCT/JP2022/021499
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English (en)
French (fr)
Japanese (ja)
Inventor
光宏 吉永
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Panasonic Intellectual Property Management Co Ltd
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Panasonic Intellectual Property Management Co Ltd
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Priority to CN202280041706.5A priority Critical patent/CN117500630A/zh
Priority to JP2023533461A priority patent/JPWO2023281930A1/ja
Publication of WO2023281930A1 publication Critical patent/WO2023281930A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/067—Dividing the beam into multiple beams, e.g. multi-focusing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/08—Devices involving relative movement between laser beam and workpiece
    • B23K26/082—Scanning systems, i.e. devices involving movement of the laser beam relative to the laser head
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding

Definitions

  • the present disclosure relates to a laser welding device, a laser welding method, and a method for manufacturing a rotating electric machine.
  • first and second electrical conductors (rectangular wire) are butted against each other, and the end faces of the first and second electrical conductors are irradiated with a laser beam to weld the end side faces together.
  • a method of laser welding is disclosed which is adapted to.
  • the laser beam is scanned in a loop to form a molten pool, and the diameter of the loop-shaped trajectory for scanning the laser beam is increased. As a result, the molten pool reaches the abutting surfaces of the side surfaces of the end portions.
  • Patent Document 2 discloses a laser head (laser irradiation means) for separately melting the ends of two electrical conductors by irradiating the ends with a laser beam to form respective melted portions.
  • a laser welding apparatus is disclosed, comprising a joining means for joining the melting welds formed at the ends of the respective electrical conductors of the book.
  • a laser welding device is a laser welding device that joins a first electrical conductor and a second electrical conductor arranged adjacent to the first electrical conductor to each other by laser welding.
  • a laser head for emitting a laser beam; and splitting the laser beam emitted from the laser head into a first laser beam directed toward the first electrical conductor and a second laser beam directed toward the second electrical conductor.
  • An optical element, a first relative position that is an emission position of the first laser beam with respect to the first electrical conductor, and a second relative position that is an emission position of the second laser beam with respect to the second electrical conductor are changed.
  • An output position changing unit and a control unit that controls the operation of the output position changing unit are provided.
  • a laser welding method is a laser welding method for joining a first electrical conductor and a second electrical conductor arranged adjacent to the first electrical conductor by laser welding. splitting, by an optical element, a laser beam emitted from a laser head into a first laser beam directed toward the first electrical conductor and a second laser beam directed toward the second electrical conductor; changing a first relative position, which is the emission position of the first laser beam with respect to the conductor, and a second relative position, which is the emission position of the second laser beam with respect to the second electrical conductor.
  • a method for manufacturing a rotating electric machine is a method for manufacturing a rotating electric machine including a stator, wherein a first electric conductor and a second electric conductor are inserted through slots provided in a stator core of the stator. a step of splitting a laser beam emitted from a laser head into a first laser beam directed toward the first electrical conductor and a second laser beam directed toward the second electrical conductor by an optical element; changing a first relative position, which is the emission position of the first laser beam with respect to one electrical conductor, and a second relative position, which is the emission position of the second laser beam with respect to the second electrical conductor; joining the electrical conductor and the second electrical conductor together by laser welding to form a coil.
  • FIG. 3 is a perspective view showing the configuration of a plurality of electrical conductors in the stator of the rotary electric machine; It is a figure explaining the procedure which joins the edge part of a 1st electrical conductor and a 2nd electrical conductor.
  • FIG. 4 is a side view showing a state in which a laser beam is emitted to the end of an electrical conductor;
  • FIG. 4 is a side view showing the branch pitch of laser beams when the position of the optical element is changed;
  • FIG. 4 is a graph showing the relationship between the position of an optical element and the branch pitch of a laser beam; 3A and 3B are a plan view and a side view showing the relationship between the position of an optical element and the branch position of a laser beam with respect to an electrical conductor; FIG. FIG. 4A is a plan view and a side view showing branching positions of a laser beam with respect to an electrical conductor when the angle of the optical element is changed; FIG. 4A is a plan view and a side view showing branching positions of a laser beam with respect to an electrical conductor when the incident position of the laser beam with respect to the optical element is changed; FIG.
  • FIG. 4A is a plan view and a side view showing branch positions of a laser beam with respect to an electrical conductor when the emission position of the laser beam with respect to the optical element is changed;
  • FIG. 4A is a plan view and a side view showing a scanning shape of a laser beam on an electrical conductor;
  • FIG. 8A is a plan view and a side view showing branching positions of a laser beam with respect to an electrical conductor when the emission position of the laser beam with respect to the optical element and the position of the optical element are changed at the same time;
  • FIG. 8A is a plan view and a side view showing branching positions of a laser beam with respect to an electrical conductor when the emission position of the laser beam with respect to the optical element and the position of the optical element are changed at the same time;
  • FIG. 4A is a plan view and a side view showing branch positions of a laser beam with respect to an electrical conductor when the emission position of the laser beam with respect to the optical element and the position of the optical element are changed at the
  • FIG. 4A is a plan view and a side view showing a scanning shape of a laser beam on an electrical conductor;
  • FIG. 4 is a plan view showing another scanning geometry of the laser beam on the electrical conductor;
  • FIG. 4 is a plan view showing another scanning geometry of the laser beam on the electrical conductor;
  • FIG. 4 is a plan view showing another scanning geometry of the laser beam on the electrical conductor;
  • FIG. 4 is a plan view showing another scanning geometry of the laser beam on the electrical conductor;
  • FIG. 4 is a plan view showing another scanning geometry of the laser beam on the electrical conductor;
  • FIG. 4 is a plan view showing another scanning geometry of the laser beam on the electrical conductor;
  • FIG. 4 is a plan view showing another scanning geometry of the laser beam on the electrical conductor;
  • FIG. 4 is a plan view showing another scanning geometry of the laser beam on the electrical conductor;
  • FIG. 4 is a plan view showing another scanning geometry of the laser beam on the electrical conductor;
  • FIG. 4 is a
  • FIG. 7 is a plan view showing the configuration of a laser welding device according to Embodiment 2; 3A and 3B are a plan view and a side view showing the relationship between the position of an optical element and the branch position of a laser beam with respect to an electrical conductor; FIG. FIG. 4A is a plan view and a side view showing branching positions of a laser beam with respect to an electrical conductor when the angle of the optical element and the position of the optical element are changed;
  • Patent Document 1 After a molten pool is formed at the end of a first electrical conductor, a molten pool is formed at the end of a second electrical conductor to fuse the molten pools. . Therefore, there is a problem that the welding time becomes long as a whole. In addition, since one molten pool that has once solidified is brought into contact with the other molten pool, there is a risk that spatter will occur during bonding, resulting in deterioration in welding quality, or a gap in the bonding portion, resulting in a decrease in bonding strength.
  • the welding time is shortened by irradiating the ends of two electrical conductors with laser beams from two laser heads and simultaneously melting and joining the ends of the electrical conductors. I'm trying However, in the invention of Patent Document 2, it is necessary to provide two laser heads, which poses a problem of increased cost.
  • the present disclosure has been made in view of this point, and an object of the present disclosure is to enable simultaneous emission of laser beams to the ends of a first electrical conductor and a second electrical conductor using a single laser head. to do.
  • the laser welding device 1 emits a laser beam LB to the end of the first electrical conductor 11 and the end of the second electrical conductor 12 .
  • the ends of the first electrical conductor 11 and the ends of the second electrical conductor 12 are joined together by laser welding.
  • the first electrical conductor 11 and the second electrical conductor 12 are, for example, the coils 17 of the stator 15 of the rotating electrical machine 10 .
  • the laser welding device 1 manufactures the rotating electric machine 10 by laser-welding the first electrical conductor 11 and the second electrical conductor 12 .
  • the rotary electric machine 10 of this embodiment can be applied to, for example, a motor for driving a vehicle, a generator, and the like.
  • the rotating electric machine 10 has a stator 15 and a rotor (not shown).
  • the stator 15 has a stator core 16 and coils 17 .
  • Stator core 16 is formed in a cylindrical shape.
  • the rotor is arranged inside the stator core 16 .
  • a plurality of slots 18 are provided in the stator core 16 .
  • the slot 18 extends axially therethrough.
  • a plurality of slots 18 are provided at regular intervals in the circumferential direction.
  • the coil 17 is inserted through the slot 18.
  • the coil 17 is configured by bundling a plurality of electrical conductors made of copper, for example.
  • the coil 17 has a first electrical conductor 11 and a second electrical conductor 12 .
  • the first electrical conductor 11 and the second electrical conductor 12 are arranged adjacent to each other. An end of the first electrical conductor 11 and an end of the second electrical conductor 12 protrude from the slot 18 .
  • the first electrical conductor 11 and the second electrical conductor 12 have, for example, end face shapes with a thickness of 2 mm and an end face width of 4 mm. Also, the gap between the first electrical conductor 11 and the second electrical conductor 12 is, for example, about 0.2 to 0.5 mm.
  • first electrical conductor 11 and the second electrical conductor 12 are covered with a coating of resin or the like over the entire surface. 12 is removed from the cover.
  • the end of the first electrical conductor 11 and the end of the second electrical conductor 12 do not necessarily have to be in contact with each other, and need only be close to each other with a slight gap. That is, at the start of laser emission, it is necessary to apply an external force to the end of the first electrical conductor 11 and the end of the second electrical conductor 12 using some mechanism so that they are in close contact with each other. There is no
  • the laser welding device 1 includes a laser oscillator 20, a laser head 25, an optical element 30, an emission position changing section 35, and a control section 40.
  • a laser oscillator 20 emits a laser beam LB.
  • the output of the laser oscillator 20 is, for example, 3 kW.
  • a laser beam LB emitted from the laser oscillator 20 is transmitted to the laser head 25 via the transmission fiber 21 .
  • the transmission fiber 21 is, for example, a single mode fiber with a beam diameter of ⁇ 50 ⁇ m.
  • the laser head 25 has a galvanomirror 26 and an f ⁇ lens 27 .
  • the galvanomirror 26 controls the traveling direction of the laser beam LB emitted from the laser oscillator 20 by changing the mirror angle.
  • the galvanomirror 26 is composed of two mirrors for the X-axis and the Y-axis, but since the drawing is complicated, only one mirror will be illustrated and explained.
  • the f ⁇ lens 27 converges the laser beam LB reflected by the galvanomirror 26 .
  • An optical element 30 is arranged between the f ⁇ lens 27 of the laser head 25 and the ends of the first electrical conductor 11 and the second electrical conductor 12 .
  • the optical element 30 splits the laser beam LB emitted from the laser head 25 into a first laser beam LB1 and a second laser beam LB2.
  • the branching angle at this time is determined by the design of the optical element 30 .
  • the optical element 30 is composed of, for example, a DOE (diffractive optical element). If the laser beam LB is simply split, the optical element 30 may be composed of a triangular prism. However, when a triangular prism is used as an optical element, the place of installation, the range of use, etc. are limited. That is, high accuracy is required for the incident position and incident angle of the laser beam to the triangular prism, and control of the emission position of the first laser beam LB1 and the second laser beam LB2 and the cross-sectional shape of the laser beam on the irradiation surface is required. From this point of view, it is preferable to use a DOE (diffractive optical element).
  • DOE diffractive optical element
  • the first laser beam LB1 is emitted to the end of the first electrical conductor 11. As shown in FIG. A part of the first electrical conductor 11 is melted to form the first melted portion 5 . A second laser beam LB2 is emitted to the end of the second electrical conductor 12 . A second melted portion 6 is formed by partially melting the second electrical conductor 12 .
  • the melting ranges of the first melting portion 5 and the second melting portion 6 are enlarged.
  • the first fusion zone 5 and the second fusion zone 6 are connected to form one joint 7 .
  • the controller 40 has a laser head controller 41 and an optical element controller 42 .
  • a laser head controller 41 controls the operation of the laser head 25 .
  • the laser head control unit 41 changes the emission position of the laser beam LB with respect to the optical element 30 by changing the angle of the galvanomirror 26 .
  • the optical element control section 42 controls the operation of the output position changing section 35 to change the position of the optical element 30 . Specifically, the optical element control section 42 controls the operations of the distance changing section 31 and the angle changing section 32 .
  • the emission position changing unit 35 changes the emission position (first relative position) of the first laser beam LB1 with respect to the first electrical conductor 11 and the emission position (second relative position) of the second laser beam LB2 with respect to the second electrical conductor 12. to change While the laser head 25 is emitting a laser beam, the control unit 40 changes the emission position of the first laser beam LB1 and the emission position of the second laser beam LB2 with respect to the second electrical conductor 12. You may control the operation
  • the emission position changing section 35 includes the galvanomirror 26, the distance changing section 31, and the angle changing section 32.
  • the galvanomirror 26 changes the emission position of the first laser beam LB1 with respect to the first electrical conductor 11 and the emission position of the second laser beam LB2 with respect to the second electrical conductor 12. change the position and
  • the distance changer 31 moves the optical element 30 along the optical axis direction (Z-axis direction) of the laser beam LB.
  • the distance changer 31 changes the distance between the optical element 30 and the ends of the first electrical conductor 11 and the ends of the second electrical conductor 12 .
  • the distance changer 31 is, for example, an actuator that holds the optical element 30 and moves the optical element 30 along the optical axis direction.
  • the optical element 30 is moved in the Z-axis direction, and the distances between the optical element 30 and the ends of the first electrical conductor 11 and the ends of the second electrical conductor 12 are changed. D1.
  • the first laser beam LB1 is emitted to substantially the center position of the first electrical conductor 11 in the X-axis direction.
  • the second laser beam LB2 is emitted to the substantially central position of the second electrical conductor 12 in the X-axis direction.
  • P1 be the branching pitch between the first laser beam LB1 and the second laser beam LB2.
  • the optical element 30 is moved in the Z-axis direction, and the distance between the optical element 30 and the end of the first electrical conductor 11 and the end of the second electrical conductor 12 is changed to D2 ( D2 ⁇ D1).
  • the first laser beam LB1 is emitted to a position near the right end of the first electrical conductor 11 in the X-axis direction.
  • the second laser beam LB2 is emitted to a position near the left end of the second electrical conductor 12 in the X-axis direction.
  • the branching pitch between the first laser beam LB1 and the second laser beam LB2 is P2, P2 ⁇ P1.
  • FIG. 6 is a graph showing the relationship between the position of the optical element and the branch pitch of the laser beam. As shown in FIG. 6, the greater the distance between the optical element 30 and the end of the first electrical conductor 11 and the end of the second electrical conductor 12, the greater the branching pitch of the laser beam LB.
  • the distance changer 31 changes the distance between the optical element 30 and the end of the first electrical conductor 11 and the end of the second electrical conductor 12 , thereby changing the distance between the first electrical conductor 11 and the end of the second electrical conductor 12 .
  • the emission position of the first laser beam LB1 and the emission position of the second laser beam LB2 with respect to the second electrical conductor 12 are changed.
  • the angle changing unit 32 changes the angle of the optical element 30 by rotating the optical element 30 in the circumferential direction around the optical axis direction of the laser beam LB.
  • the angle changer 32 is, for example, a rotary motor that holds the optical element 30 and rotates the optical element 30 around the optical axis direction.
  • the laser beam LB incident on the optical element 30 is a first laser beam LB1 directed in the -X direction in FIG. and a second laser beam LB2 directed in the direction.
  • the first laser beam LB1 is emitted to the center position of the first electrical conductor 11 in the X-axis direction and the Y-axis direction.
  • the second laser beam LB2 is emitted to the central position of the second electrical conductor 12 in the X-axis direction and the Y-axis direction.
  • the first laser beam LB1 is emitted to the upper right corner of the first electrical conductor 11.
  • the second laser beam LB2 is emitted to the lower left corner of the second electrical conductor 12 .
  • the angle changer 32 changes the angle of the optical element 30 to change the emission position of the first laser beam LB1 with respect to the first electrical conductor 11 and the emission position of the second laser beam LB2 with respect to the second electrical conductor 12. change the position and
  • the laser beam LB when the laser beam LB is incident on the center position of the optical element 30, it splits into a first laser beam LB1 and a second laser beam LB2. Each is emitted to the center position of the conductor 12 .
  • the first laser beam LB1 is branched. and the second laser beam LB2 are emitted to the first electrical conductor 11 and the second electrical conductor 12, respectively, at positions moved in the -Y direction while the branch pitch remains constant.
  • the mirror angle of the galvanomirror 26 is changed and the laser beam LB is incident on the position moved in the -X direction from the center position of the X-axis direction of the optical element 30,
  • the first laser beam LB1 and the second laser beam LB2 are emitted to the first electrical conductor 11 and the second electrical conductor 12, respectively, at positions moved in the -X direction while the branch pitch remains constant.
  • the first laser beam LB1 moves along the first spiral trajectory.
  • the second laser beam LB2 moves along the second spiral trajectory.
  • the scanning shape of the first laser beam LB1 and the second laser beam LB2 becomes a spiral shape.
  • the first laser beam LB1 and the second laser beam LB2 are scanned over a wide range in a desired scanning shape at the ends of the first electrical conductor 11 and the second electrical conductor 12. can be emitted to
  • the laser beam LB when the laser beam LB is incident on the center position of the optical element 30, it splits into a first laser beam LB1 and a second laser beam LB2. Each is emitted to the center position of the conductor 12 .
  • the mirror angle of the galvanomirror 26 is changed, and the laser beam LB is made incident on a position moved from the center position of the optical element 30 in the -Y direction. Further, the position of the optical element 30 is moved upward by the distance changer 31 .
  • the branched first laser beam LB1 and the second laser beam LB2 are emitted to the first electrical conductor 11 and the second electrical conductor 12, respectively, at positions moved in the -Y direction as the branch pitch increases. be done.
  • the emission position of the first laser beam LB1 moves in the -X and -Y directions.
  • the emission position of the second laser beam LB2 moves in the +X direction and the -Y direction.
  • the mirror angle of the galvanomirror 26 is changed, and the laser beam LB is made incident on the position moved in the +Y direction from the center position of the optical element 30 .
  • the distance changer 31 is not operated. That is, the position of the optical element 30 is the same as the position in FIG.
  • the first laser beam LB1 and the second laser beam LB2 are emitted to the first electrical conductor 11 and the second electrical conductor 12 at positions moved in the +Y direction with the same branch pitch.
  • the first laser beam The beam LB1 moves along a first elliptical trajectory
  • the second laser beam LB2 moves along a second elliptical trajectory.
  • the scanning shape of the first laser beam LB1 and the second laser beam LB2 becomes an elliptical shape.
  • the scanning shape of the first laser beam LB1 and the scanning shape of the second laser beam LB2 are symmetrical across the gap between the first electrical conductor 11 and the second electrical conductor 12 .
  • the scanning shape of the first laser beam LB1 and the second laser beam LB2 can be varied.
  • the first laser beam LB1 and the second laser beam LB2 are moved.
  • the scanning shape of the beam LB1 and the second laser beam LB2 may be spiral.
  • the spiral laser scanning speed may be, for example, 300 to 500 mm/s.
  • the branching pitch between the first laser beam LB1 and the second laser beam LB2 may be set to 2 mm, for example.
  • the first laser beam LB1 and the second laser beam LB2 are moved from a position near the -Y direction toward the +Y direction in a spiral locus. It should be made to move along. As a result, the melted portions of the first electrical conductor 11 and the second electrical conductor 12 become one melted mass, and the ends of the first electrical conductor 11 and the second electrical conductor 12 are joined together.
  • the first laser beam LB1 and the second laser beam LB2 may be moved along a spiral trajectory while the distance between the first laser beam LB1 and the second laser beam LB2 is reduced.
  • the first laser beam LB1 is moved from a position near the -Y direction toward the +Y direction along a spiral trajectory and moved along a position near the +X direction.
  • the second laser beam LB2 is moved along a spiral trajectory from a position closer to the -Y direction toward the +Y direction, and is moved along a position closer to the -X direction.
  • processing can be performed while heat is collected between the first electrical conductor 11 and the second electrical conductor 12, and welding quality can be improved.
  • the scanning shape of the first laser beam LB1 and the scanning shape of the second laser beam LB2 are symmetrical across the gap between the first electrical conductor 11 and the second electrical conductor 12.
  • the first laser beam LB1 may have a helical shape by moving the first laser beam LB1 along a spiral trajectory from a position near the +Y direction toward the -Y direction.
  • the first laser beam LB1 spirally rotates counterclockwise.
  • the second laser beam LB2 may be formed into a spiral shape by moving the second laser beam LB2 along a spiral trajectory from a position near the +Y direction toward the -Y direction.
  • the second laser beam LB2 spirally rotates clockwise.
  • the scanning shape of the first laser beam LB1 and the second laser beam LB2 may be elliptical.
  • the first laser beam LB1 is emitted in an elliptical shape outward from the center position in the Y-axis direction at a position closer to the +X direction, and the ellipse radius gradually increases.
  • the second laser beam LB2 is emitted in an elliptical shape toward the outside from the center position in the Y-axis direction at a position closer to the -X direction, so that the ellipse radius gradually increases.
  • the elliptical laser scanning speed may be, for example, 300 to 500 mm/s.
  • the first laser beam LB1 is emitted in an elliptical shape toward the inside from the center position in the Y-axis direction at a position near the -X direction, and the elliptical radius gradually increases.
  • the second laser beam LB2 may be emitted in an elliptical shape toward the inside from the center position in the Y-axis direction at a position closer to the +X direction, and the elliptical radius may gradually increase.
  • the first laser beam LB1 and the second laser beam LB2 overlap in the gap between the first electrical conductor 11 and the second electrical conductor 12. As shown in FIG.
  • the scanning shape of the first laser beam LB1 and the second laser beam LB2 may be a spiral shape.
  • the first laser beam LB1 spirals from the center position in the Y-axis direction toward the center in the X-axis direction and the Y-axis direction of the first electrical conductor 11 at a position closer to the +X direction. emitted.
  • the second laser beam LB2 is emitted in a spiral shape from the center position in the Y-axis direction toward the center in the X-axis direction and the Y-axis direction at a position closer to the +X direction.
  • the scanning shape of the first laser beam LB1 and the second laser beam LB2 described above is merely an example, and other scanning shapes may be used.
  • the laser welding device 1 includes a laser head 25, a control section 40, a detection section 51, and a stage 50. Note that the laser oscillator 20, the optical element 30, the emission position changing unit 35, and the like are omitted in FIG.
  • a stator 15 is installed on the stage 50 .
  • the stage 50 rotates the stator 15 in the circumferential direction.
  • a plurality of first electrical conductors 11 and second electrical conductors 12 are arranged on the stator 15 at intervals in the circumferential direction.
  • the laser head 25 laser-welds the ends of the first electrical conductor 11 and the second electrical conductor 12 to each other.
  • a detector 51 is provided downstream of the laser head 25 in the rotation direction of the stage 50 .
  • the detection unit 51 detects the positional relationship between the end of the first electrical conductor 11 and the end of the second electrical conductor 12 .
  • a detection result of the detection unit 51 is sent to the control unit 40 . After that, by rotating the stage 50 , the inspected first electrical conductor 11 and the second electrical conductor 12 are transported to the laser emission position of the laser head 25 .
  • the detection unit 51 detects the positions of the first electrical conductor 11 and the second electrical conductor 12 to be inspected next.
  • the detection unit 51 is, for example, an image sensor.
  • the controller 40 has a laser head controller 41 , an optical element controller 42 , and a positional deviation amount calculator 43 .
  • the positional deviation calculation unit 43 calculates the relative positional deviation of the end of the second electrical conductor 12 with respect to the end of the first electrical conductor 11 based on the detection result of the detection unit 51 .
  • the control unit 40 changes the emission positions of the first laser beam LB1 and the second laser beam LB2 by controlling the operation of the emission position changing unit 35 based on the calculation result of the positional deviation amount calculation unit 43.
  • the first laser beam LB1 is positioned at a position shifted in the +Y direction from the center position of the first electrical conductor 11 in the X-axis direction and the Y-axis direction. emitted to Also, the second laser beam LB2 is emitted to a position shifted in the -Y direction from the central position of the first electrical conductor 11 in the X-axis direction and the Y-axis direction.
  • control unit 40 controls the operation of the emission position changing unit 35 so that the first laser beam LB1 and the second laser beam LB2 are emitted to the center positions of the first electrical conductor 11 and the second electrical conductor 12. Correct the exit position as follows.
  • the angle changer 32 rotates the optical element 30 in the circumferential direction to rotate the emission positions of the first laser beam LB1 and the second laser beam LB2. Further, the branch pitch of the first laser beam LB1 and the second laser beam LB2 is increased by moving the optical element 30 upward using the distance changing unit 31 (see FIG. 1).
  • the optical element 30 is of a type that is simply bifurcated, but it is not limited to this form.
  • an optical element that branches into a ring shape or a shape with concentric point branches added around the main laser beam that has been branched into two may be used.
  • the laser beam emitted from the laser head is split into the first laser beam and the second laser beam by the optical element.
  • the emission position changer changes the emission position of the first laser beam with respect to the first electrical conductor and the emission position of the second laser beam with respect to the second electrical conductor.
  • a single laser head can be used to simultaneously emit a laser beam to the ends of the first electrical conductor and the second electrical conductor.
  • the ends of the first electrical conductor and the second electrical conductor can be melted and joined at the same time, shortening the welding time, improving the melting quality, and reducing the cost of the laser welding apparatus.
  • one laser head can be used to simultaneously emit a laser beam to the ends of the first electrical conductor and the second electrical conductor.
  • a single laser head can be used to simultaneously emit laser beams to the ends of the first electrical conductor and the second electrical conductor, which is highly practical. Therefore, it is extremely useful and has high industrial applicability.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Laser Beam Processing (AREA)
PCT/JP2022/021499 2021-07-08 2022-05-26 レーザ溶接装置、レーザ溶接方法及び回転電機の製造方法 Ceased WO2023281930A1 (ja)

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