US Patent No. 10,840,665

LASER MACHINING APPARATUS


Patent No. 10,840,665
Issue Date November 17, 2020
Title Laser Machining Apparatus
Inventorship Masahiro Honda, Yamanashi (JP)
Assignee FANUC CORPORATION, Yamanashi (JP)

Claim of US Patent No. 10,840,665

1. A laser machining apparatus wherein a machining head is connected to a laser oscillator which includes: a plurality of current control units connected mutually in parallel to a power supply and controlling current outputted from the power supply;a plurality of laser diode modules which are connected one-to-one to the plurality of current control units, and output light by the current controlled by the current control units flowing therethrough;
a plurality of laser cavities which connect one-to-several to the plurality of laser diode modules, and amplify and then output light outputted by the laser diode modules; and
a beam combiner which connects one-to-several to the plurality of laser cavities, and combines light outputted by the plurality of laser cavities,
wherein the laser machining apparatus is configured to perform machining by outputting the light combined by the beam combiner under control of a control unit from the machining head, the laser machining apparatus further comprising:
a current monitor unit which monitors each value of current controlled by the plurality of current control units; and
a power monitor unit which monitors each value of intensity of light outputted by the plurality of laser diode modules, each value of intensity of light outputted by the plurality of laser cavities, and value of intensity of light outputted by the beam combiner,
wherein the laser machining apparatus is configured to judge a failure location based on values of current monitored by the current monitor unit, and values of intensity of light monitored by the power monitor unit,
the failure location is judged to be in the plurality of current control units if any value of current controlled by the plurality of current control units is 0 A,
the failure location is judged to be in the plurality of laser diode modules if the failure location is not judged to be in the plurality of current control units and any value of intensity of light outputted by the plurality of laser diode modules is 0 kW,
the failure location is judged to be in the plurality of laser cavities if the failure location is not judged to be in the plurality of current control units or the plurality of laser diode modules and any value of intensity of light outputted by the plurality of laser cavities is 0 kW, and
the failure location is judged to be at the beam combiner if the failure location is not judged to be in the plurality of current control units, the plurality of laser diode modules, or the plurality of laser cavities, and the value of intensity of light outputted by the beam combiner is 0 kW.