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首页> 外文期刊>Journal of Materials Engineering and Performance >Thermal Modeling of Direct Digital Melt-Deposition Processes
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Thermal Modeling of Direct Digital Melt-Deposition Processes

机译：直接数字熔体沉积过程的热模型

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摘要

Additive manufacturing involves creating three-dimensional (3D) objects by depositing materials layer-by-layer. The freeform nature of the method permits the production of components with complex geometry. Deposition processes provide one more capability, which is the addition of multiple materials in a discrete manner to create “heterogeneous” objects with locally controlled composition and microstructure. The result is direct digital manufacturing (DDM) by which dissimilar materials are added voxel-by-voxel (a voxel is volumetric pixel) following a predetermined tool-path. A typical example is functionally gradient material such as a gear with a tough core and a wear-resistant surface. The inherent complexity of DDM processes is such that process modeling based on direct physics-based theory is difficult, especially due to a lack of temperature-dependent thermophysical properties and particularly when dealing with melt-deposition processes. In order to overcome this difficulty, an inverse problem approach is proposed for the development of thermal models that can represent multi-material, direct digital melt deposition. This approach is based on the construction of a numerical-algorithmic framework for modeling anisotropic diffusivity such as that which would occur during energy deposition within a heterogeneous workpiece. This framework consists of path-weighted integral formulations of heat diffusion according to spatial variations in material composition and requires consideration of parameter sensitivity issues.
机译：增材制造涉及通过逐层沉积材料来创建三维（3D）对象。该方法的自由形式性质允许生产具有复杂几何形状的组件。沉积过程提供了另一种功能，即以离散方式添加多种材料来创建具有局部控制的成分和微观结构的“异质”物体。结果就是直接数字制造（DDM），通过这种方法，可以按照预定的刀具路径，将不同的材料逐个体素地添加（体素是体积像素）。典型的示例是功能梯度材料，例如具有坚硬的芯和耐磨表面的齿轮。 DDM工艺的固有复杂性使得基于直接基于物理的理论的工艺建模非常困难，尤其是由于缺乏依赖温度的热物理特性，尤其是在处理熔体沉积工艺时。为了克服这一困难，提出了一种反问题方法，用于开发可以表示多材料直接数字熔体沉积的热模型。这种方法是基于数值算法框架的构建，用于建模各向异性扩散率，例如在异质工件内进行能量沉积时会发生的扩散率。该框架包括根据材料成分的空间变化进行热扩散的路径加权积分公式，并且需要考虑参数敏感性问题。

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