关键词: 表面条纹, 光固化立体造型, 选择性激光烧结, 增材制造

Abstract: The surface stripes of nylon SLS parts for STL was studied. Based on the principle of SLS technology, storage rules of STL and formation principle of laser scanning path, the nylon SLS experiments of STL were designed, and the formation mechanism of surface stripes of STL model data sintered parts was analyzed. A method was proposed to avoid the formation of stripes.The experiments and analysis show that the surface stripes are caused by the absence or redundancy of triangles in the model data plane when the system software reads the data. The surface stripes are related to the Z coordinate value of STL in the forming coordinate system, and have certain regularity with the actual sintering layer thickness. STL surface fringes may be avoided by homogenizing the triangle of STL or making its Z coordinate values not in specific coordinates.

Key words: surface stripe, stereolithography(STL), selective laser sintering(SLS), additive manufacturing