| Journal Title /掲載ジャーナル名 |
Additive Manufacturing |
| Publication Year and Month /掲載年月 |
October, 2022 |
| Paper Title /論文タイトル |
Simultaneous optimization of hatching orientations and lattice density distribution for residual warpage reduction in laser powder bed fusion considering layerwise residual stress stacking |
| DOI /論文DOI |
10.1016/j.addma.2022.103194 |
| Author of Waseda University /本学の著者 |
TAKEZAWA, Akihiro(Professor, Faculty of Science and Engineering, School of Fundamental Science and Engineering):First Author, Corresponding Author |
| Related Websites /関連Web |
– |
| Abstract /抄録 |
The reduction in the residual warpage generated via fabrication is an emerging issue in metals’ laser powder bed fusion additive manufacturing (AM). One solution from a design for additive manufacturing (DfAM) perspective is to arrange a hatching strategy that utilizes the asymmetry of the residual stress generated from a molten pool. Another approach is to arrange the geometry of the parts, such as forming an inner lattice structure to arrange the effective stiffness. In this study, the simultaneous optimization of the laser hatching orientation and lattice density distribution was conducted to minimize the residual warpage in lattice infill structures and confirm their synergetic effect. The mutual effect of each layer was highlighted when considering the mechanical background of the optimal results because an imbalance in the residual stress caused the warpage of the AM parts between the layers. The proposed methodology was validated via experimental verification using a quasi-2D plate, 3D bracket, and 3D connecting-rod design problems. The residual warpage in the quasi-2D study, measured as the edge’s vertical deformation, was reduced from 23.4% to 39.4% compared with the benchmark design. In the 3D studies, the warpage reductions ranged from 13.1% to 20.7%. |
