选择性激光烧结峰值温度的三维有限元模拟

选择性激光烧结(SLS)中工艺参数和扫描路径对烧结件性能有较大影响,文中研究了激光烧结工艺参数和扫描路径对峰值温度的影响规律。通过建立SLS的温度场模型并开发C++的有限元模拟软件,分析了激光功率、激光扫描速率及预热温度等工艺参数对SLS峰值温度的影响,对比了不同扫描路径下高分子粉末和金属粉末的SLS峰值温度变化规律。数值算例表明,SLS温度场中峰值温度随激光功率和预热温度的升高而升高,随激光扫描速率的升高而降低;扫描路径对高分子粉末SLS峰值温度的影响较小;开发的温度场模型准确合理,能够为实际生产提供理论依据。

Three Dimensional Simulation of Peak Temperature of Selective Laser Sintering by Finite Element Method

Process parameters and scanning path of selective laser sintering(SLS)have a large impact on the quality of sintered parts.The influence of laser sintering process parameters and scanning path on peak temperature was studied.The temperature model for SLS was established and a corresponding C++finite element simulation software was developed.The effects of laser power,laser scanning rate and preheating temperature on the SLS peak temperature were investigated during the numerical examples.The difference of SLS peak temperature between polymer powder and metal powder was compared by taking different scanning paths.Numerical examples show that the peak temperature increases with the increase of laser power and preheating temperature,and decreases with the increase of laser scanning rate.The scanning path has small effect on the peak temperature of polymer SLS while it has large effect on that of metal SLS.The presented temperature field model is verified and reasonable,and can provide theoretical guidance for actual production.