In-line quality control using dimensional metrology of 3D metal parts printed by laser beam melting

摘要

We present an approach for quality control using dimensional metrology based on structured light applied to laser beammelting. This application serves as a model for in-line monitoring under adverse conditions such as elevatedtemperatures, stray light and thermal gradients in the process chamber making closed-loop control very ambitious.Nevertheless, we demonstrate the implementation of precise dimensional measurement of printed parts and powderdeposition allowing in- or off-line process assessment. As data acquisition and processing must be fast, we investigatethe so-called structure function to extract global or local parameters such as roughness or geometrical periodicities likewaviness of the powder deposition.