基于STL文件的柱状支撑结构自动生成算法

Automatic Generation Algorithm of Cylindrical Support Structure Based on STL File

摘要:

熔融挤压三维打印以热塑性材料为原料逐层打印完成,由于熔丝只能沉积在已存在的物体上层,模型悬空部位需要添加支撑结构。为解决该问题,提出一种基于STL(Stereo Lithography)文件的稀疏柱状支撑结构自动生成算法。算法通过对比三角面片倾斜角度与模型临界角的大小,获取独立的待支撑区域,然后基于边长自适应法和射线与面片相交法得到待支撑点集,自动生成支撑结构。此外为了保证模型表面质量和支撑结构的稳定性,支撑结构不在模型表面生成。调整支撑结构形状,进一步提高支撑结构的稳定性。通过实验证明本文算法比Cura软件节约15%的材料消耗,支撑结构更容易剥离,模型表面质量更好。

Abstract:

Fused deposition modeling 3D printing thermoplastic material as a raw material layer by layer print completed, because the fuse can only be deposited on the existing objects in the upper part of the model need to add support structure hanging parts.To solve this problem, an automatic support structure generation algorithm based on STL (Stereo Lithography).Algorithm to obtain an independent area to be supported, based on the edge-length adaptive method and ray and patch intersection method to be supported point set to automatically generate the support structure.In addition, the support structure is prevented from growing on the surface of the model and the shape of the support structure is adjusted.Experiments show that the proposed algorithm saves 15% of the material consumption compared with Cura software, the support structure is more easily peeled off and the surface quality of the model is better.