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1
EP3708338A1
DETERMINATION DEVICE FOR DETERMINING AT LEAST ONE PARAMETER OF A SURFACE
Publication/Patent Number: EP3708338A1 Publication Date: 2020-09-16 Application Number: 19162198.6 Filing Date: 2019-03-12 Inventor: Gärber, Bertram   Assignee: Concept Laser GmbH   IPC: B29C64/153 Abstract: Determination device (6) for determining at least one surface parameter of an apparatus (1) for additively manufacturing three-dimensional objects (2) by means of successive layerwise selective consolidation of layers of a build material (3) which can be consolidated by means of an energy source, wherein the apparatus (1) comprises a chamber (5), in particular a process chamber in which the additive manufacturing process is performed, wherein the determination device (6) comprises at least one wave generator (7) adapted to generate at least one wave (8), in particular an acoustic wave, and guide the wave (8) across at least one surface (9) delimiting the chamber (5) and/or across at least one surface (9) of a component of the apparatus (1), wherein the determination device (6) is adapted to determine at least one surface parameter of the surface (9) based on at least one determined wave parameter of the wave (8, 8').
2
EP3626433A1
METHOD FOR CALIBRATING AN IRRADIATION DEVICE
Publication/Patent Number: EP3626433A1 Publication Date: 2020-03-25 Application Number: 18195570.9 Filing Date: 2018-09-19 Inventor: Klaußner, Tim   Dicken, Christian   Gärber, Bertram   Assignee: Concept Laser GmbH   IPC: B29C64/153 Abstract: Method for calibrating an irradiation device (2) of an apparatus (1) for additively manufacturing three-dimensional objects by means of successive layerwise selective irradiation and consolidation of layers of a build material which can be consolidated by means of an energy beam (6, 10), which irradiation device (2) comprises at least two irradiation units (3, 4), wherein a first irradiation unit (3) is adapted to generate at least one first energy beam (6) and guide the first energy beam (6) via a first beam guiding unit (7) in a first guiding region of a build plane (8), wherein a second irradiation unit (4) is adapted to generate at least one second energy beam (10) and guide the second energy beam (10) via a second beam guiding unit (11) in a second guiding region of a build plane (8), comprising the steps: - guiding one of the at least two energy beams (6, 10) via the corresponding irradiation unit (3, 4) to a determination region (15), preferably a part of a build plane (8), for generating a calibration pattern (18, 19) - imaging at least one part of the determination region (15) to an on-axis determination unit (12, 14) of the at least one other irradiation unit (3, 4) - determining a position of the calibration pattern (18, 19) in the determination region (15) on basis of the image of the at least one part of the determination region (15) - generating calibration information relating to a calibration status of at least one part of the irradiation device (2) based on the position of the calibration pattern (18, 19).