激光选区熔化工艺晶格支撑结构快速建模

Rapid Modeling of Lattice Support Structures for Selective Laser Melting

针对激光选区熔化成型工艺中的支撑结构,提出一种晶格单元自动填充生成支撑的快速建模方法。首先,分别对两种典型晶格支撑结构——杆架结构和孔隙结构的组成单元实现参数化造型,并建立支撑结构数字化模型;其次,设计实现杆件单元和孔隙单元的造型算法;最后,提出一种单元自然生长算法,实现对支撑空间快速填充。实例结果表明,晶格结构可以对不同类型金属产品结构实现有效稳定支撑;相比实体材料,平均可以节省72%的材料用量,具有重要的工程意义。

Aimed at the support structures in laser selective melting,a rapid modeling method is proposed that the lattice cells can be automatically filled to generate support structures.First of all,the parameterized modeling is applied on the units of two typical lattice support structures-struss structures and porous structures,and the digitalized model of the support structures is established.Secondly,the design and implementation are made on the modeling algorithm of struss and porous unit.Finally,a rapid filling for supporting spaces is realized through a cell natural growth algorithm.The results of the examples show that the lattice structure can provide effective and stable support for different types of structures.Compared with the solid materials,lattice structure’s material consumption can be saved by 72%on average,which has an important engineering significance.