Patent ID: 11969823
Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 4:
5. A laser processing method performed by a laser processing apparatus including a first mirror that changes traveling directions of processing laser light and measurement light, a second mirror that changes an incidence angle of the measurement light to the first mirror, and a lens that collects the processing laser light and the measurement light at a processing point on a processing surface of a workpiece, controlling the first mirror and the second mirror to irradiate the workpiece with the processing laser light and the measurement light on the basis of corrected processing data, and measuring a depth of a keyhole generated at the processing point irradiated with the processing laser light, on the basis of interference caused by an optical path difference between the measurement light reflected at the processing point and reference light, wherein
the corrected processing data is data for eliminating a deviation in an arrival position of at least one of the processing laser light and the measurement light on the processing surface, the deviation being caused by chromatic aberration of the lens, and
the corrected processing data includes an output instruction value indicating an oscillation intensity of the processing laser light, a first instruction value indicating an operation amount of the first mirror, and a second instruction value indicating an operation amount of the second mirror, which are set in advance for processing points,
the laser oscillator, the first mirror, and the second mirror are controlled on the basis of corrected processing data corresponding to the processing point among the processing points, and
the laser processing method comprising:
causing the laser processing apparatus to execute:
setting a processing section passing through a target position on the processing surface;
setting a measurement section centered on the target position in the processing section;
setting a plurality of data acquisition positions that are trajectories perpendicular to a processing direction in the measurement section;
acquiring pieces of measurement data indicating shapes of keyholes at the respective data acquisition positions during processing of the processing section;
projecting the pieces of measurement data in the processing direction to be superimposed on each other to create projection data; and
obtaining the second instruction value in a direction perpendicular to the processing direction at the target position on the basis of the projection data.