Distortion caused by differential shrinkage between melting section and non-melting section and shape correction of 3D data for manufacturing in Powder Bed Fusion

Abstract

In Powder Bed Fusion (PBF), there is difference CAD date and fabricated object due to unintended distortion in manufacturing process. This paper reports specific distortion such as side of frame is pushed from the inside is characterized by non-melting section located on the inside shrinkage direction of melting section. In this case, non-melting section serve as not only support and also prevention of melted section shrinkage. Due to obtain improved fabricated object, CAD data is deformed before manufacturing with finite element method (FEM). Using FEM, it is not necessary to draw and model 3D curved surface, possible to reduce re-modeling cost.