【摘要】 以典型的悬垂结构为研究对象，通过Simufact Additive建立有限元模型，并对SLM成形工艺过程进行模拟分析，考察工艺过程中总变形量和残余应力的变化情况，讨论扫描策略、扫描速度、光斑直径、激光功率及铺层厚度对悬垂结构的总变形量和残余应力的影响。分析结果表明，当SLM打印完成后制件的总变形量最小，残余应力最大，支撑去除后，残余应力有所降低，但总变形量会随之增大。扫描角度的旋转增量为60°时，悬垂结构总变形量及残余应力最小。在一定范围内，随着扫描速度和光斑直径的增大，悬垂结构总变形量及残余应力呈减小趋势；随着激光功率的增大，其总变形量呈增大趋势。随着铺层厚度的增大，其总变形量及残余应力呈先减小后增大的趋势。更多还原

【Abstract】 Taking the typical overhanging structure as the research object, the finite element model was established through Simufact Additive, and the SLM forming process was simulated and analyzed to investigate the changes of the total deformation amount and residual stress in the process. The influences of scanning strategy, scanning speed, spot diameter, laser power and layer thickness on the total deformation amount and residual stress of the overhanging structure were discussed. The analysis results show that when the SLM printing is completed, the total deformation amount of the workpiece is the smallest, and the residual stress is the largest. After the support is removed, the residual stress decreases somewhat, but the total deformation amount will increase accordingly. When the rotational incremental of the scanning angle is 60°, the total deformation amount and residual stress of the overhanging structure are the smallest. Within a certain range, with the increase of scanning speed and spot diameter, the total deformation amount and residual stress of the overhanging structure show a decreasing trend. With the increase of laser power, its total deformation amount shows an increasing trend. With the increase of the layer thickness, its total deformation amount and residual stress show a trend of first decreasing and then increasing.更多还原