论文部分内容阅读
建立了激光选区熔化(SLM)加工的多层瞬态热有限元模型,该模型考虑了随温度变化的材料属性,并通过将粉末材料的热物理属性转换为实体材料的热物理属性来模拟粉末-实体的转换过程,有限元分析结果与单熔道实验结果吻合,验证了该模型的有效性。研究了扫描速度(0.2 m/s,0.4 m/s,0.6 m/s)和激光功率(80 W,100 W,120 W)对温度场的影响,并研究了相邻层之间的铺粉过程的冷却效应。结果显示,当扫描速度越大时,温度峰值点相较激光光斑中心越偏后,温度峰值和温度梯度随着激光功率的增大或者扫描速度的减小而增大,该研究为SLM加工工艺参数的选择提供了理论依据。
A multi-layer transient thermal finite element model for laser selective melting (SLM) processing is established. The model takes into account the material properties as a function of temperature and simulates the powder by converting the thermophysical properties of the powder material into the thermophysical properties of the solid material - entity conversion process, the results of finite element analysis are in good agreement with the experimental results of single-melt channel, and the validity of the model is verified. The effects of scanning speed (0.2 m / s, 0.4 m / s, 0.6 m / s) and laser power (80 W, 100 W, 120 W) on the temperature field were investigated. The cooling effect of the process. The results show that when the scanning speed is larger, the temperature peak point is more deviated from the laser spot center, the temperature peak and temperature gradient increase with the increase of laser power or the scanning speed. The research is the SLM processing technology The choice of parameters provides the theoretical basis.