研究論文
粉末床溶融結合法で造形したラティスの形状不整および機械的特性
2022 年 72 巻 5 号 p. 191-197
詳細
2022 年 72 巻 5 号 p. 191-197
In this study, the influence of laser process parameters on the observed geometrical imperfections in a lattice structure were investigated experimentally. The imperfections were measured by using the X-ray CT machine, and the compressive response of lattice structures fabricated by our in-house metal 3D printer based on the powder bed fusion (PBF) process were investigated. In particular, the effects of the observed geometrical imperfections on the mechanical properties (initial stiffness and plastic yield strength) of the structure were discussed. The cross-section of the inclined strut in a lattice becomes ovalized which is due to the excessive heat flowing through the metal powder around the cross-section. The ovalization becomes significant as the laser scanning speed increases. From the mechanical properties predicted based on geometric imperfections, the best conditions for enhancing the initial stiffness and the plastic yield strength for a lattice block were found that the laser power p＝150W and the scanning speed v＝700 mm/s.
