基于SLM的薄壁圆筒结构成型过程热行为分析-中国材料进展

文章信息/Info

Title:: Thermal Behavior Analysis of Thin-Walled Cylinder Structure During Forming Process Based on SLM

Author(s):: Author DU Shihao; GAO Xueqiang; LIU Zhao; DING Chenyang; HAN Zhijie; College of Mechanical Engineering， Hebei University of Science and Technology， Shijiazhuang 050018, China

Keywords:: SLM; thin-walled cylinder; high strength aluminum alloy; scanning strategy; transient temperature field

摘要:: 考虑薄壁圆筒与平板结构在选区激光熔化（SLM）成型过程中的差异性，基于ANSYS建立了SLM成型的多层多道温度场薄壁圆筒有限元模型，采用数值模拟手段研究扫描策略对薄壁圆筒模型温度场及应力场的影响，结合“单元生死”技术描述了Al7075金属粉末材料的动态增长过程，得出了瞬态温度场及应力场的分布状况。结果表明，单道长度足够时，激光已成型部位有充足的时间消散热量，不同扫描策略的温度场优势也变得比较微弱；不同扫描策略带来的应力优势仍然存在，即使在温度优势变得微弱的情况下，合理的扫描策略仍然可以有效改善打印件的应力状态。本研究为薄壁圆筒类结构在SLM成型过程中的热行为分析提供参考。

Abstract:: Considering the difference between thin-walled cylinder and flat structure in selective laser melting(SLM) forming process, this paper established a multilayer and multi-channel temperature field finite element model of thin-walled cylinder formed by SLM based on ANSYS, and used numerical simulation to study the influence of scanning strategy on temperature field and stress field of thin-walled cylinder model. The dynamic growth process of Al7075 metal powder was described with the technique of “cell life and death”, and the distribution of transient temperature field and stress field was obtained. The results show that when the length of single channel is sufficient, the formed part of laser has enough time to dissipate heat, and the temperature field advantage of different scanning strategies becomes weak. The stress advantage brought by different scanning strategies still exists, even when the temperature advantage becomes weak, a reasonable scanning strategy can still effectively improve the stress state of the printed part. This paper provides an important reference for thermal behavior analysis of thin-walled cylindrical models during molding.