关键词: 3D打印, 连续纤维, 应力适应, 路径规划, 曲面打印, 共挤出打印

Abstract: Continuous carbon fiber composites have high axial strength and modulus and anisotropic characteristics. In order to give full play to the reinforcing effect of fibers in the axial direction on the shaped parts,and combining with the advantages of 3D printing technology that can form arbitrary complex models,the surface layer optimization and path planning method based on stress-oriented was proposed and was carried out for the working conditions under the composite state of tensile and compressive stresses. At the same time,the panned fiber path was optimized to improve the continuity and manufacturability. And the co-extrusion process was considered to realize the printing of variable-thickness curved surface slices with a three-axis printer. Experiments were carried out to verify the 3D printing performance enhancement. Compared with the traditional path planning methods,the proposed method has a significant enhancement effect with a minimum increase of 26.89 % and 51.45 % in maximum load and compressive stiffness,respectively.

Key words: 3D printing, continuous fiber, stress-oriented, path planning, surface printing, co-extrusion printing