飞机栅格零件SLM成形过程的变形演化仿真研究

Design and Simulation of Support and Partition for SLM Forming of Aircraft Grid Parts

栅格零件是某型无人机中的关键功能结构,形状复杂,形貌精度控制要求较高,非常适合采用激光选区熔化(SLM)工艺进行制造。利用华中科技大学研发的iAdditive仿真软件对栅格零件的SLM成形过程进行仿真分析,对支撑与关键塑性变形位置的分区打印策略进行了设计和优化。结果表明:通过仿真模拟可以迅速获得SLM成形过程中的关键塑性变形位置,通过分区设计可以使关键堆积层的变形量减小大约60%;通过对比支撑切除之后的模拟结果与试验结果,两者之间的变形趋势和变形数值吻合良好,最大变形处在中间栅格区域,变形量约为2.0mm。

Grid part is a kind of key functional structure in a certain type of UAV.Grid Parts have complex shapes and high-precision control requirements,and are very suitable for laser selective melting(SLM)manufacturing.In this paper,the additive simulation software developed by Huazhong University of Science and Technology is used to simulate and analyze the SLM forming process of grid parts,and design and optimize the partition printing strategy of supports and key plastic deformation positions.The results show that the key plastic deformation positions in the SLM forming process can be quickly obtained through simulation,and the deformation of the key accumulation layer can be reduced by about 60%through the zone design;by comparing the simulation results after support removal with the test results,the deformation trend and the deformation value between two are in good agreement,the maximum deformation is in the middle grid area,and the deformation is about 2.0mm.