尼龙6选区激光烧结温度场的数值模拟

采用ANSYS软件对尼龙6粉末材料激光烧结过程温度场进行了三维数值模拟，计算模型中，考虑了材料热物性随温度变化的非线性特征，采用更接近实际的高斯热源模型，并利用APDL参数化设计语言实现热源的移动控制，用焓处理相变潜热的影响。模拟结果显示，烧结点的温度随着扫描线的增加，先逐渐升高后趋于稳定，烧结点最高温度滞后于光斑中心到达该位置时刻，烧结区域边界最高温度小于内部的最高温度。最后进行了试验验证，与试验结果较吻合。

Numerical Simulation of Temperature Field in Selective Laser Sintering on PA6 Powders

The simulation of the three-dimensional temperature field in selective laser sintering （SLS） was carried out by using the software of ANSYS. The nonlinear factors of temperature-dependent material properties have been taken into account in the computational model, and the Gauss thermal resource which closer to the actual thermal resource was used, besides, the APDL （ANSYS Parametric Design Language） was used to carry out the moving control of thermal resource and the effect of latent heat was considered by using enthalpy. The simulation results show that the temperature of the sintering point rises gradually and stabilizes later with the increasing of the scan line, the highest temperature of sintering point lags behind the arrival moment of the center spot, the maximum temperature of sintering region boundary is lower than the internal. Finally, the sintering experiment was carried out, it indicates that the experimental result agrees with the previous simulation result well.