WO2023149451A1 - レーザ加工方法 - Google Patents

レーザ加工方法 Download PDF

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Publication number
WO2023149451A1
WO2023149451A1 PCT/JP2023/003155 JP2023003155W WO2023149451A1 WO 2023149451 A1 WO2023149451 A1 WO 2023149451A1 JP 2023003155 W JP2023003155 W JP 2023003155W WO 2023149451 A1 WO2023149451 A1 WO 2023149451A1
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WO
WIPO (PCT)
Prior art keywords
laser
laser beam
core
wavelength
emitted
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2023/003155
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English (en)
French (fr)
Japanese (ja)
Inventor
龍幸 中川
篤寛 川本
潤司 藤原
通雄 櫻井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Intellectual Property Management Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Panasonic Intellectual Property Management Co Ltd filed Critical Panasonic Intellectual Property Management Co Ltd
Priority to JP2023578579A priority Critical patent/JPWO2023149451A1/ja
Publication of WO2023149451A1 publication Critical patent/WO2023149451A1/ja
Priority to US18/781,168 priority patent/US20240375211A1/en
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
    • B23K26/062—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam
    • B23K26/0626—Energy control of the laser beam
    • 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
    • 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
    • B23K26/0604—Shaping the laser beam, e.g. by masks or multi-focusing by a combination of beams
    • B23K26/0608—Shaping the laser beam, e.g. by masks or multi-focusing by a combination of beams in the same heat affected zone [HAZ]
    • 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
    • B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms

Definitions

  • the present invention relates to a laser processing method.
  • Patent Document 1 while a first laser beam is incident on a first fiber core of a double-clad fiber, a second laser beam having a wavelength different from that of the first laser beam is incident on a second fiber core, and a workpiece is irradiated with the laser beam.
  • a laser cutting method is disclosed in which a first laser beam and a second laser beam are emitted from a laser beam.
  • the emission of the first laser beam and the second laser beam is stopped at the same time at the laser end position, a crater may be generated and the processing quality of the workpiece may be deteriorated.
  • the present invention has been made in view of this point, and its object is to suppress the occurrence of craters at the laser end position.
  • a first aspect is a laser processing method in which a laser beam transmitted through a transmission fiber is emitted to process a workpiece, wherein the transmission fiber includes a first core and an outer peripheral portion of the first core. and a second core, wherein the laser beam includes a first laser beam and a second laser beam having a longer wavelength than the first laser beam, and when the machining of the workpiece is finished, the first laser beam and a laser termination step of adjusting the output of the second laser beam, wherein the laser termination step emits the first laser beam from the second core while emitting the second laser beam from the first core. and gradually decreasing the output of the second laser beam emitted from the first core while moving the emission positions of the first laser beam and the second laser beam with respect to the workpiece in the laser processing direction. and a third step of stopping the output of the second laser beam while the first laser beam is emitted from the second core.
  • the transmission fiber has at least a first core and a second core.
  • the second core is provided on the outer periphery of the first core.
  • the first laser beam is emitted from the second core, and the second laser beam is emitted from the first core.
  • the output of the second laser beam emitted from the first core is gradually reduced while moving the emission positions of the first laser beam and the second laser beam with respect to the workpiece in the laser processing direction.
  • the output of the second laser light is stopped while the first laser light is emitted from the second core.
  • the front of the second laser light is preheated.
  • the work surface behind the second laser beam can be cleaned.
  • a second aspect is characterized by including a fourth step of emitting the first laser light from the first core and the second core after the third step in the first aspect.
  • the first laser light is emitted from the first core and the second core to widen the emission range of the first laser light, thereby suppressing the occurrence of craters at the welding end point over a wide range.
  • FIG. 1 is a side view showing a schematic configuration of a laser processing apparatus according to this embodiment.
  • FIG. 2 is a cross-sectional view of the transmission fiber viewed from the incident end side.
  • FIG. 3 is a graph showing the relationship between the wavelength of laser light and reflectance.
  • FIG. 4 is a graph showing temporal changes in the total output of laser light.
  • FIG. 5A is a diagram showing a state in which the second laser light is made incident on the first core and the first laser light is made incident on the second core.
  • FIG. 5B is a diagram showing a state in which the first laser beam is emitted from the second core while the second laser beam is emitted from the first core while the laser processing head is moving.
  • FIG. 5A is a diagram showing a state in which the second laser light is made incident on the first core and the first laser light is made incident on the second core.
  • FIG. 5B is a diagram showing a state in which the first laser beam is emitted from the second core while the second laser beam
  • FIG. 6A is a diagram showing a state in which the output of the second laser beam to be incident on the first core is lowered.
  • FIG. 6B is a diagram showing a state in which the output of the second laser light is lowered while the emission positions of the first laser light and the second laser light are moved.
  • FIG. 7A is a diagram showing a state in which the first laser beam is made incident on the second core.
  • FIG. 7B is a diagram showing a state in which the first laser beam is emitted from the second core at the laser end position.
  • FIG. 8A is a diagram showing a state in which the first laser light is made incident on the first core and the second core.
  • FIG. 8B is a diagram showing a state in which the first laser light is emitted from the first core and the second core at the laser end position.
  • FIG. 9 is a graph showing temporal changes in the total output of laser light according to this modification.
  • the laser processing device 1 includes an optical coupling unit 10, a transmission fiber 20, a laser processing head 30, a robot 2, and a controller 5.
  • the optical coupling unit 10 includes a first laser oscillator 11, a second laser oscillator 12, a first mirror 13, a second mirror 14, a third mirror 15, a first adjustment mechanism 16, and a second adjustment mechanism 17. and a third adjusting mechanism 18 .
  • the first laser oscillator 11 emits the first laser beam L1 based on the command from the control unit 5.
  • the first laser beam L1 is a short wavelength laser beam.
  • the short-wavelength first laser light L1 is blue laser light or green laser light with a wavelength of 600 nm or less (for example, 266 nm to 600 nm).
  • the first laser oscillator 11 emits a plurality of first laser beams L1 from a plurality of laser modules (not shown).
  • the second laser oscillator 12 emits the second laser beam L2 based on the command from the control unit 5.
  • the second laser beam L2 is a long-wavelength laser beam having a longer wavelength than the first laser beam L1.
  • the long-wavelength second laser light L2 is infrared laser light with a wavelength of 800 nm or more (for example, about 800 nm to 16000 nm).
  • the first mirror 13 reflects some of the first laser beams L1 emitted from the first laser oscillator 11 and guides them to the first adjustment mechanism 16 .
  • the second mirror 14 reflects the remaining first laser beams L1 out of the plurality of first laser beams L1 emitted from the first laser oscillator 11 and guides them to the second adjustment mechanism 17 .
  • the third mirror 15 reflects the second laser beam L2 emitted from the second laser oscillator 12 and guides it to the third adjustment mechanism 18 .
  • the first adjustment mechanism 16 is composed of, for example, a two-axis MEMS (Micro Electro Mechanical Systems) mirror.
  • the first adjustment mechanism 16 further reflects the first laser beam L ⁇ b>1 reflected by the first mirror 13 and guides it to the transmission fiber 20 .
  • the first adjustment mechanism 16 changes the incident position of the first laser beam L1 with respect to the transmission fiber 20 by changing the angle of the mirror. This allows the first laser beam L1 to selectively enter the first core 21 or the second core 22 of the transmission fiber 20 .
  • the second adjustment mechanism 17 is composed of, for example, a two-axis MEMS mirror.
  • the second adjustment mechanism 17 further reflects the first laser beam L ⁇ b>1 reflected by the second mirror 14 and guides it to the transmission fiber 20 .
  • the second adjustment mechanism 17 changes the incident position of the first laser beam L1 with respect to the transmission fiber 20 by changing the angle of the mirror. This allows the first laser beam L1 to selectively enter the first core 21 or the second core 22 of the transmission fiber 20 .
  • the third adjustment mechanism 18 is composed of, for example, a two-axis MEMS mirror.
  • the third adjustment mechanism 18 further reflects the second laser beam L2 reflected by the third mirror 15 and guides it to the transmission fiber 20 .
  • the third adjustment mechanism 18 changes the incident position of the second laser beam L2 with respect to the transmission fiber 20 by changing the angle of the mirror. This allows the second laser light L2 to selectively enter the first core 21 or the second core 22 of the transmission fiber 20 .
  • first adjustment mechanism 16, the second adjustment mechanism 17, and the third adjustment mechanism 18 may be configured using a biaxial galvanometer (galvanomirror) instead of the biaxial MEMS mirror.
  • the optical coupling unit 10 and the laser processing head 30 are connected by a transmission fiber 20.
  • the first laser beam L ⁇ b>1 and the second laser beam L ⁇ b>2 are transmitted to the laser processing head 30 via the transmission fiber 20 .
  • the transmission fiber 20 has a first core 21 , a second core 22 , a first clad 23 , a second clad 24 and a protective coating 25 .
  • the first core 21 is arranged at the axial center of the transmission fiber 20 .
  • the first core 21 is formed in a circular shape when viewed from the axial direction.
  • the first core 21 is made of quartz glass, for example.
  • a first clad 23 is provided on the outer periphery of the first core 21 .
  • the first clad 23 is provided coaxially with the first core 21 .
  • the first clad 23 is made of a material having a lower refractive index than the first core 21 .
  • the first clad 23 is made of, for example, fluorine-doped quartz glass. The refractive index of the first clad 23 is lower than that of the first core 21 .
  • a second core 22 is provided on the outer periphery of the first clad 23 .
  • the second core 22 is provided coaxially with the first core 21 .
  • the second core 22 is formed in a ring shape when viewed from the axial direction.
  • the second core 22 is made of the same material as the first core 21, such as quartz glass.
  • the refractive index of the second core 22 is higher than that of the first clad 23 .
  • a second clad 24 is provided on the outer periphery of the second core 22 .
  • the second clad 24 is provided coaxially with the first core 21 and the second core 22 .
  • the second clad 24 is made of, for example, fluorine-doped quartz glass.
  • the refractive index of the second clad 24 is lower than that of the second core 22 .
  • a protective film 25 is provided on the outer peripheral portion of the second clad 24 .
  • the protective film 25 is made of synthetic resin, for example.
  • the protective film 25 mechanically protects the first core 21, the second core 22, the first clad 23, and the second clad 24 made of quartz glass.
  • the protective coating 25 prevents the first laser beam L1 and the second laser beam L2 from leaking from the transmission fiber 20 and prevents light from leaking into the transmission fiber 20 from the outside.
  • the laser processing head 30 emits a first laser beam L1 and a second laser beam L2 incident from the transmission fiber 20 to the work W.
  • the laser beam is emitted with the outer peripheral portion of the circular second laser beam L2 surrounded by the ring-shaped first laser beam L1.
  • the laser processing head 30 has a collimator lens 31 , a fourth mirror 32 and a condenser lens 33 .
  • the collimator lens 31 collimates the first laser beam L1 and the second laser beam L2 emitted from the emission end of the transmission fiber 20 .
  • the fourth mirror 32 reflects the first laser beam L1 and the second laser beam L2 collimated by the collimator lens 31 and guides them to the condenser lens 33 .
  • the condenser lens 33 condenses the first laser beam L1 and the second laser beam L2.
  • the first laser beam L1 and the second laser beam L2 condensed by the condensing lens 33 are emitted to the work W. As shown in FIG.
  • the robot 2 has a robot arm 3.
  • a laser processing head 30 is attached to the tip of the robot arm 3 .
  • the robot arm 3 has multiple joints 4 .
  • the robot 2 changes the position of the laser processing head 30 with respect to the workpiece W by moving the laser processing head 30 along a predetermined welding direction (processing direction) based on a command from the control unit 5 .
  • processing direction processing direction
  • the emission positions of the first laser beam L1 and the second laser beam L2 with respect to the workpiece W are moved, and laser processing is performed.
  • the controller 5 is connected to the optical coupling unit 10, the laser processing head 30, and the robot 2.
  • the controller 5 controls the operations of the optical coupling unit 10 , the laser processing head 30 and the robot 2 .
  • control unit 5 controls the output start and stop of the first laser beam L1 and the second laser beam L2, the output intensity of the first laser beam L1 and the second laser beam L2, and the like. It also has the function to In addition, although the control part 5 has one structure here, you may comprise more than one.
  • the workpiece W is formed in a plate shape, for example.
  • the workpiece W is composed of a high reflectance material with a low laser absorption rate.
  • the reflectance of the laser beam differs depending on the material of the workpiece W.
  • copper (Cu), aluminum (Al), gold (Au), and silver (Ag) are laser beams compared to iron (Fe).
  • Fe iron
  • the reflectance (%) of the wavelength of light is high, in other words, it is a high reflectance material with low laser absorptance.
  • iron (Fe) has a relatively low reflectance (%) of the wavelength of the laser light, in other words, it is a low reflectance material with a high laser absorptivity.
  • the workpiece W which is a high reflectance material with a low laser absorptance, is made of copper.
  • the workpiece W may be made of gold or silver.
  • the laser processing apparatus 1 emits a first laser beam L1 to partially melt the surface of the work W first at the laser start position S, which is the welding start point of the work W, at the start of laser irradiation in the laser irradiation start process. After forming a molten pool and performing preheating, the second laser beam L2 is emitted. As a result, it is possible to suppress the occurrence of spatter at the laser start position S in the process of starting laser irradiation.
  • the laser processing apparatus 1 moves the laser processing head 30 from the laser start position S to the laser end position E, which is the welding end point of the work W, while applying the first laser beam L1 and/or the second laser beam L1 to the work W.
  • a laser beam L2 is emitted to perform laser welding.
  • control is performed to suppress the generation of craters in the laser end process.
  • the laser termination process is shown in FIG.
  • the laser main process is shifted to the laser end process by a laser end command.
  • the controller 5 performs the first step between time T1 and time T2 after the laser processing head 30 is moved by a predetermined distance from the laser starting position S in the welding direction.
  • the controller 5 causes the first core 21 to emit the long-wavelength second laser beam L2 and the second core 22 to emit the short-wavelength first laser beam L1. It controls the operation of the coupling unit 10 .
  • the controller 5 moves the laser processing head 30 in the welding direction.
  • the first step is to form a weld strength retention area in the area of the bead edge to obtain the penetration that provides the joint strength.
  • the controller 5 operates the first short-wavelength laser oscillator 11 to emit a first short-wavelength laser beam L1, while the second long-wavelength laser oscillator 12 emits a first short-wavelength laser beam L1. is operated to emit the long-wavelength second laser beam L2.
  • the control unit 5 adjusts the angle of the mirror of the first adjustment mechanism 16 to cause the first laser beam L1 reflected by the first mirror 13 to enter the second core 22 of the transmission fiber 20 .
  • the control unit 5 adjusts the angle of the mirror of the second adjustment mechanism 17 to cause the first laser beam L1 reflected by the second mirror 14 to enter the second core 22 of the transmission fiber 20 .
  • the control unit 5 adjusts the angle of the mirror of the third adjusting mechanism 18 to cause the second laser beam L2 reflected by the third mirror 15 to enter the first core 21 of the transmission fiber 20 .
  • the long-wavelength second laser beam L2 that has entered the first core 21 is emitted to the workpiece W in a circular shape.
  • the short-wavelength first laser beam L1 that has entered the second core 22 is emitted toward the workpiece W in a ring shape.
  • the output of the first laser beam L1 is set to 0.5 kW to 4 kW, preferably 2 kW.
  • the output of the second laser beam L2 is set to 10 kW, for example.
  • a molten pool 40 is formed on the work W at the position where the short-wave first laser beam L1 and the long-wave second laser beam L2 are emitted to the work W.
  • a weld bead 41 is formed on the workpiece W behind the molten pool 40 in the welding direction by the solidification of the molten pool 40 .
  • the control unit 5 performs the second step between time T2 and time T3.
  • the controller 5 causes the first core 21 to emit the long-wavelength second laser beam L2 and the second core 22 to emit the short-wavelength first laser beam L1. It controls the operation of the coupling unit 10 .
  • the control unit 5 gradually reduces the output of the second long-wavelength laser beam L2 emitted from the first core 21 .
  • the controller 5 operates the short-wavelength first laser oscillator 11 to emit a short-wavelength first laser beam L1, while the long-wavelength second laser oscillator 12 is operated to emit the long-wavelength second laser beam L2.
  • the control unit 5 adjusts the angle of the mirror of the first adjustment mechanism 16 to cause the first laser beam L1 reflected by the first mirror 13 to enter the second core 22 of the transmission fiber 20 .
  • the control unit 5 adjusts the angle of the mirror of the second adjustment mechanism 17 to cause the first laser beam L1 reflected by the second mirror 14 to enter the second core 22 of the transmission fiber 20 .
  • the control unit 5 adjusts the angle of the mirror of the third adjusting mechanism 18 to cause the second laser beam L2 reflected by the third mirror 15 to enter the first core 21 of the transmission fiber 20 .
  • the long-wavelength second laser beam L2 incident on the first core 21 is emitted to the workpiece W in a circular shape.
  • the short-wavelength first laser beam L1 that has entered the second core 22 is emitted toward the workpiece W in a ring shape.
  • the control unit 5 controls the operation of the second laser oscillator 12 to reduce the output of the second long-wavelength laser beam L2 incident on the first core 21 .
  • the output of the second laser beam L2 is set to 4 kW, for example.
  • the output of the second laser beam L2 at time T3 is smaller than the output of the second laser beam L2 at time T2. Therefore, the total output P2 of the laser light at time T3 is smaller than the total output P3 of the laser light at time T2.
  • the control unit 5 adjusts the output of the second long-wavelength laser light L2 incident on the first core 21 so that the total output of the laser light gradually changes from P3 to P2.
  • the operation of the second laser oscillator 12 is controlled so as to gradually decrease the .
  • the generation of spatter can be suppressed by gradually decreasing the output of the laser beam while moving the laser processing head 30 in the welding direction.
  • the control unit 5 performs the fifth step between time T3 and time T4.
  • the controller 5 causes the first core 21 to emit the long-wavelength second laser beam L2 and the second core 22 to emit the short-wavelength first laser beam L1. It controls the operation of the coupling unit 10 . Further, the controller 5 moves the laser processing head 30 in the welding direction. Between the time T3 and the time T4, the first laser beam L1 and the second laser beam L2 are emitted with the outputs set in FIGS. 6A and 6B.
  • the control unit 5 performs the third step between time T4 and time T5.
  • the controller 5 causes the optical coupling unit 10 to stop outputting the second long-wavelength laser beam L2 while the first short-wavelength laser beam L1 is emitted from the second core 22. controls the behavior of The laser processing head 30 reaches the laser end position E at time T4. The controller 5 stops the movement of the laser processing head 30 .
  • the control unit 5 adjusts the angle of the mirror of the first adjustment mechanism 16 to cause the first laser beam L1 reflected by the first mirror 13 to enter the second core 22 of the transmission fiber 20 .
  • the controller 5 adjusts the angle of the mirror of the second adjustment mechanism 17 to cause the first short-wavelength laser beam L1 reflected by the second mirror 14 to enter the second core 22 of the transmission fiber 20 .
  • the total output P1 of the laser light at the laser end position E becomes smaller than the total output P2 of the laser light during the fifth step.
  • the short-wavelength first laser beam L1 that has entered the second core 22 is emitted toward the workpiece W in a ring shape.
  • a molten pool 40 is formed at the laser end position E of the workpiece W.
  • the occurrence of a crater at the laser end position E where the movement of the laser processing head 30 is stopped can be prevented.
  • the machining quality of the workpiece W can be improved.
  • the control unit 5 performs the fourth step.
  • the controller 5 controls the operation of the optical coupling unit 10 so that both the first core 21 and the second core 22 emit the short-wavelength first laser light L1.
  • the control unit 5 operates the first laser oscillator 11 to emit the short-wave first laser light L1, while stopping the operation of the long-wave second laser oscillator 12 .
  • the control unit 5 adjusts the angle of the mirror of the first adjusting mechanism 16 to cause the first laser beam L1 reflected by the first mirror 13 to enter the first core 21 of the transmission fiber 20 .
  • the control unit 5 adjusts the angle of the mirror of the second adjustment mechanism 17 to cause the first laser beam L1 reflected by the second mirror 14 to enter the second core 22 .
  • the short-wavelength first laser beam L1 incident on the first core 21 is emitted to the workpiece W in a circular shape.
  • the short-wavelength first laser beam L1 that has entered the second core 22 is emitted toward the workpiece W in a ring shape.
  • the first laser beam L1 is emitted from the first core 21 and the second core 22, and the emission range of the first laser beam L1 is widened without changing or increasing the output power.
  • the occurrence of craters at the laser end position E of the workpiece W made of reflective material can be suppressed over a wide range.
  • control unit 5 stops the operations of the first laser oscillator 11 and the second laser oscillator 12 to end laser welding.
  • ⁇ Modification>> As shown in FIG. 9, between time T1 and time T2, a first step of emitting short-wavelength first laser beam L1 from second core 22 and emitting second laser beam L2 from first core 21. I do. In the first step, the total power of laser light is P3.
  • a second step is performed in which the output of the laser light L2 is gradually reduced until the total output of the laser light is reduced from P3 to P2.
  • the output of the first laser beam L1 and the output of the second laser beam L2 are substantially the same.
  • the third step of stopping the output of the long-wavelength second laser beam L2 while the short-wavelength first laser beam L1 is emitted from the second core 22 is performed.
  • the total power of laser light is P1.
  • time T4 which is the laser end position E
  • the movement of the laser processing head 30 is stopped, and in a state in which the short-wavelength first laser beam L1 is emitted from the second core 22, the long-wavelength second laser beam L2 is output. Switching control is performed to stop
  • a fourth step of emitting short-wavelength first laser light L1 from the first core 21 and the second core 22 is performed.
  • the robot 2 moves the laser processing head 30 to change the position of the laser processing head 30 with respect to the work W, but the present invention is not limited to this form.
  • the work W may be mounted on a moving table (not shown), and the work W may be moved relative to the laser processing head 30 .
  • the laser processing head 30 and the moving table on which the work W is mounted are relatively moved, and the first laser beam L1 and the second laser beam L2 are moved relatively to the work W for processing.
  • the present invention is not limited to this configuration.
  • a configuration in which a laser processing head that emits the short-wavelength first laser beam L1 and a laser processing head that emits the long-wavelength second laser beam L2 are provided separately may be used.
  • the present invention has a highly practical effect of being able to suppress the occurrence of craters at the laser end position, so 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/JP2023/003155 2022-02-02 2023-02-01 レーザ加工方法 Ceased WO2023149451A1 (ja)

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JP2023578579A JPWO2023149451A1 (https=) 2022-02-02 2023-02-01
US18/781,168 US20240375211A1 (en) 2022-02-02 2024-07-23 Laser processing method

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JP2022014615 2022-02-02
JP2022-014615 2022-02-02

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Citations (3)

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Publication number Priority date Publication date Assignee Title
WO2017134964A1 (ja) * 2016-02-05 2017-08-10 村田機械株式会社 レーザ加工機およびレーザ加工方法
JP2018174059A (ja) * 2017-03-31 2018-11-08 パナソニックＩｐマネジメント株式会社 溶接構造体及びその製造方法
WO2019176502A1 (ja) * 2018-03-15 2019-09-19 パナソニックＩｐマネジメント株式会社 レーザ発振器、それを用いたレーザ加工装置及びレーザ発振方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017134964A1 (ja) * 2016-02-05 2017-08-10 村田機械株式会社 レーザ加工機およびレーザ加工方法
JP2018174059A (ja) * 2017-03-31 2018-11-08 パナソニックＩｐマネジメント株式会社 溶接構造体及びその製造方法
WO2019176502A1 (ja) * 2018-03-15 2019-09-19 パナソニックＩｐマネジメント株式会社 レーザ発振器、それを用いたレーザ加工装置及びレーザ発振方法

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