レーザ照射型金属積層造形におけるサポート構造の熱変形と残留応力への影響

Abstract

It is investigated by numerical simulation that the effect of support structure shape on the residual stress and thermal deformation after the selective laser melting process for Ni-base alloy. The analyzed models were double cantilever models with comb type support structure under the thin plate and triangular prism on the tips. The comb width was varied. The models were virtually cooled from 1240°C down to 100°C. And the bottom of support structure was detached from the base-plate. The equivalent stress showed that the residual stress was not generated in comb support structure but the triangle prism part. The tip of the triangle prism part had the maximum equivalent stress, which suggests that the detachment of support structure begins from the tip. The deformation after the detachment of from the base-plate revealed the cantilever with fat comb had relatively smaller spring-back and flat surface. The cantilever without support structure showed large spring-back.