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为了较准确描述激光烧结时温度场的分布特性,初步建立了用于模拟尼龙12/HDPE(HighDensity Polyethylene,高密度聚乙烯粉末激光烧结过程中传热行为的数学模型,该模型考虑了诸如热传导等与烧结有关的热现象。在热物性参数呈非线性变化的情况下,采用ANSYS参数化设计语言处理移动热源,对烧结材料的温度场进行了数值模拟,通过试验对模拟结果进行检测,并用扫描电镜对烧结样品进行分析。模拟结果表明,最高温度点滞后于光斑中心,试验测量值与模拟值误差在3.6%以内。模拟结果与初步实验结果较为吻合。
In order to describe the distribution characteristics of the temperature field accurately during laser sintering, a mathematical model for simulating the heat transfer behavior of nylon 12 / HDPE (high density polyethylene powder laser sintering) has been established. The model considers such as heat conduction In the case of non-linear thermophysical parameters, ANSYS parameterized design language is used to process the moving heat source, the temperature field of the sintered material is numerically simulated, and the simulation results are tested through the test Electron microscopy was used to analyze the sintered samples.The simulation results showed that the maximum temperature lagged behind the spot center, and the error between the measured value and the simulated value was less than 3.6% .The simulation results were in good agreement with the preliminary experimental results.