关键词: 增材制造, 连续纤维, 3D 编织, 连续路径, 各向异性

Abstract: In order to improve the mechanical strength and reduce the anisotropy of fused filament fabrication (FFF)
workpiece, a three-dimensional continuous braiding path planning method was proposed. The method employed
continuous fiber reinforced material as printed material, designed an eight-loop structure, and utilized 3D printer
nozzle to extrude wire for the generation of warp/weft yarn. The movement of the FFF platform was controlled in z
direction, continuous deposition route similar to 3D woven fiber was produced, and different layers were mutually
interacted and embedded in order to realize interlock between adjacent section planes, thus improving the connection
strength within and between layers. This cyclic structure supported continuous path planning, so that it can be
manufactured on a conventional three-axis fuse manufacturing platform and be widely applicable. Compared with the
standard sample, the rationality and feasibility of the braided structure were verified. Experiments show that the 3D
continuous fiber braided printing path can support the filling of different structures, and can effectively reduce the
anisotropy of mechanical properties caused by layered deposition of materials, thereby enhancing the reliability of
printing pieces with complex structures.

Key words: additive manufacture, continuous filament, 3D woven fiber, continuous path, anisotropy