Internal defect detection system, three-dimensional additive manufacturing apparatus, internal defect detection method, three-dimensional additive manufactured article manufacturing method, and three-dimensional additive manufactured object

摘要

The present invention relates to a shaping defect detection system for a three-dimensional lamination-shaping device for performing lamination shaping by radiating laser light to a powder bed. In this system, a candidate position for a shaping defect is specified on the basis of the amount of variation in a localized temperature measured in a laser-light-irradiated part of the powder bed. The cooling rate in the candidate position is calculated on the basis of a temperature distribution, and a determination is made as to whether a shaping defect is present on the basis of the cooling rate.