Thermal model and measurements of polymer laser sintering
Thermal model and measurements of polymer laser sintering
复制标题
聚合物激光烧结的热模型和测量
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
J. Beaman
中科院分区：
文献类型：
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作者：
T. Diller;Mengqi Yuan;D. Bourell;J. Beaman
目的-本文的目的是分析激光烧结（LS）之前和期间构建室环境中的体能量传输过程，为LS过程的有效和准确的热控制提供基础。这使得LS产品的机械性能和几何公差得到改善，并且可以应用于优化LS工艺的操作周期时间。设计/方法/方式-计算模型与两个层次的复杂性，建立了探索在LS过程中的传热机制。在一维模型（1D）中，粉末作为半无限固体和加热器通量的粉末表面进行建模与加热器控制律。构建室和粉末箱的二维（2D）流体/固体有限元模型提供了对构建室中热过程的深入了解。结果-数值1D模拟验证了嵌入在构建室粉末床的传感器的测量。使用2D模型，计算功率…
Purpose – The purpose of this paper is to analyze the bulk energy transport processes in the build chamber environment before and during laser sintering (LS) to provide a basis for effective and accurate thermal control for the LS process. This leads to improved mechanical properties and geometrical tolerances for LS products and may be applied to optimize operation cycle times for the LS process. Design/methodology/approach – Computational models with two levels of complexity were built to explore the heat transfer mechanisms in the LS process. In a one-dimensional model (1D), the powder performed as a semi-infinite solid and heater flux to the powder surface was modeled with a heater control law. A two-dimensional (2D) fluid/solid finite element model of the build chamber and powder bins provided insight into the thermal processes in the build chamber. Findings – Numerical 1D simulations were verified with measurements from sensors embedded in the build chamber powder bed. Using a 2D model, computed pow...