Study on influential factors for process monitoring and control in laser aided additive manufacturing
Study on influential factors for process monitoring and control in laser aided additive manufacturing
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DOI：
10.1016/j.jmatprotec.2012.10.006
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发表时间：
2013-03-01
影响因子：
6.3
通讯作者：
Gasser, A.
中科院分区：
文献类型：
--
作者：
Bi, G.;Sun, C. N.;Gasser, A.
本文对激光辅助增材制造（LAAM）过程监控进行了研究。对影响过程监测和控制的一些关键问题进行了详细的揭示和讨论。结果表明，零件的几何形状会影响熔池温度，尤其是在散热受到严重限制的情况下。功率密度分布对于受控 LAAM 过程起着重要作用。激光束只能散焦到一定程度，以避免因光束尺寸过大而导致功率密度不足。这会导致熔覆表面和熔覆层中出现缺陷。在工艺控制过程中必须避免表面氧化，因为表面氧化会恶化 LAAM 工艺，正如测量熔池温度的扰动所表明的那样。通过路径相关的过程控制，可以显着提高沉积的尺寸精度。 (C) 2012 Elsevier B.V. 保留所有权利。
In this paper, the process monitoring and control in laser aided additive manufacturing (LAAM) were studied. Some key issues which affect the process monitoring and control were revealed and discussed in detail. The results show that the geometry of the parts affects the melt-pool temperature, especially where the heat dissipation is strongly limited. The power density distribution plays an important role for controlled LAAM process. The laser beam can only be defocused to a certain extent to avoid the insufficient power density due to the excessively enlarged beam size. This can cause defects on the clad surface and in the clad layer. Surface oxidation must be avoided during the process control, because surface oxidation can deteriorate the LAAM process, as indicated by the disturbances of the measured melt pool temperature. With the path-dependant process control, the dimensional accuracy of the deposition can be significantly improved. (C) 2012 Elsevier B.V. All rights reserved.