Abstract:  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.

Key words:  selective laser melting, support structures, lattice structures, digital modeling