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首页> 外文期刊>The International Journal of Advanced Manufacturing Technology >Warping in SLM additive manufacturing processes: estimation through thermo-mechanical analysis
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Warping in SLM additive manufacturing processes: estimation through thermo-mechanical analysis

机译：SLM添加剂制造过程中的翘曲：通过热机械分析估算

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摘要

In additive manufacturing (AM), uneven cooling and thermal deformations deteriorate the quality of manufactured parts. However, the complexity of the non-linear systems, which are required for the modelling of the plasticity phenomena that take place, requires long simulations, a fact that renders them impractical, especially for machine control. In this study, a proof of concept for a numerical-empirical modelling approach of the thermo-mechanical phenomena of the AM process of selective laser melting (SLM) is presented. The dynamic elastic equation is solved in a two-dimensional (2D) space utilizing finite differences (FD); the solution of the coupled dynamic thermal equation is used as input. Movement of the laser heating and melting phase change are also considered. The effects of plasticity in the x-axis of the part are taken into account, utilizing a re-meshing strategy while an empirical bottom boundary condition is used for the encapsulation of the plasticity effects of the z-axis of the part. In this way, the effects of plasticity are taken into account in the proposed thermo-mechanical model, without the need to solve complex non-linear systems. The results of this study have been experimentally validated.
机译：在添加制造（AM），冷却不均匀和热变形恶化制造的部件的质量。然而，所述非线性系统，其中所需的所发生的塑性现象的建模的复杂性，需要很长的模拟，即使它们不切实际的，尤其是用于机器控制的事实。在这项研究中，概念的用于选择性激光熔化（SLM）的AM过程的热机械现象的数值经验建模方法的证明被呈现。的动态弹性方程的求解在利用有限差分（FD）的二维（2D）空间中;耦合动态热方程的解被用作输入。激光加热和熔化相变的运动也被考虑。在的部分的x轴塑性的效果考虑在内，利用重新啮合策略，而经验底部边界条件被用于该部分的z轴的塑性效果的封装。以这种方式，塑性的效果考虑到所提出的热机械模型，而不需要解决复杂的非线性的系统。这项研究的结果已被实验验证。

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