Field-driven energy control scanning method for selective laser melting lattice structures

Abstract

Abstract While processing metal lattices, the selective laser melting (SLM) technique is prone to flaws such as warping, dross, and low forming dimensional accuracy due to the inhomogeneity of the temperature field during the forming process. This paper proposed a field-driven energy control scanning method. The energy control factor field is calculated by the hemispherical convolution operator in voxel space according to the signed distance field of the model combined with the material thermal conductivity. The optimized variable process parameter field data is obtained by coupling with the initial process parameter field. The laser power on the metal lattice scanning path can be precisely controlled by domain and segment. The experimental results show that the surface roughness of the variable-parameter printed gradient lattice is much better than that of the single-parameter printed lattice, and the compressive mechanical characteristics of the lattice are nearly doubled.