关键词: 选区激光熔化, 温度场, 支撑结构, 导热性

Abstract: Support structures were required in SLM processes to support overhanging features in order to hold the work piece in the place and remove heat away from the processes. If heat accumulation in overhangs was too large, it would cause defects such as warpage, collapse, residual thermal stress，et al. Therefore, the influences of support structures on the temperature field of SLM were studied, and  support structures with good comprehensive heat conduction were designed. Firstly, a three-dimensional finite element model of SLM was established. Then, the influences of the traditional support structures on the temperature field were studied. Finally,  support structures were designed and optimized based on the numerical simulation results. It was verified by finite element analyses and manufacturing experiments. Results show that compared with the traditional support structures, the top sintering layers of the thin plates supported by the new support structures have the lowest average node temperature and small temperature difference, showing good comprehensive heat conduction, and the degree of warpages of the thin plates is significantly reduced.

Key words: selective laser melting(SLM), temperature field, support structure, heat conduction