Patent ID: 11899421
Assignee: TRUMPF LASER- UND SYSTEMTECHNIK GMBH
Field: Materials, metallurgy (Chemistry)
Classification: CPC G  B  Y | IPC B  G

Claim 10:
11. A machining device for producing three-dimensional components by irradiating powder layers, the machining device comprising:
an irradiation device comprising a laser source and a laser scanner configured to direct a laser beam from the laser source toward a processing field;
a processing chamber in which the processing field is located wherein the processing chamber comprises a powder layer support surface on which the powder layers are applied and wherein the processing chamber comprises a retroreflector arranged in or above the processing field of the laser scanner and also between a processing sample in the processing field and the laser scanner;
a photodetector arranged to detect laser radiation reflected back into the laser scanner from the retroreflector as the laser beam passes over the retroreflector;
a computer coupled with non-transitory computer-readable medium encoding instructions that cause the computer to perform operations comprising
determining an actual position of the laser beam in the processing field based on the detected laser radiation,
specifying a target position of the laser beam in the processing field, and
correcting the specified target position based on the determined actual position;

an additional laser scanner configured to direct an additional laser beam in an additional processing field of the processing chamber; and
an additional photodetector arranged to detect additional laser radiation reflected back into the additional laser scanner by the retroreflector as the additional laser beam passes over the retroreflector, wherein the operations further comprise
determining an actual position of the additional laser beam in the additional processing field based on the additional laser radiation detected,
specifying a target position of the additional laser beam in the additional processing field, and
correcting the specified target position based on the determined actual position of the additional laser beam.