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首页> 外文期刊>Journal of Applied Polymer Science >Effects of laser polishing on surface quality and mechanical properties of PLA parts built by fused deposition modeling
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Effects of laser polishing on surface quality and mechanical properties of PLA parts built by fused deposition modeling

机译：激光抛光对融合沉积建模建筑的PLA零件表面质量和力学性能的影响

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摘要

Fused deposition modeling (FDM) produces parts through layer by layer on the top of each other, making it almost impossible to obtain smooth printed parts. Hence, there is a huge demand for the postprocessing of the FDM-printed parts. Laser polishing is a novel technique that can be used to polish products to obtain a smoother surface. The aim of this work was to explore the feasibility of surface-finishing FDM-printed polylactic acid (PLA) parts by laser polishing. The surface roughness, surface morphology, dynamic mechanical analysis (DMA), and tensile properties were investigated. The results indicated that the lower laser power and the bigger laser beam diameter within a certain range could facilitate the formation of smoother surface. With optimized parameters, the surface roughness was reduced by 90.4%. DMA showed that the storage modulus (E') and glass transition temperature of PLA specimens were significantly improved due to the decrease of molecular mobility of denser structures. Moreover, the tensile strength and Young's modulus of the PLA specimen were also significantly increased after laser polishing. The fracture morphologies were observed, and the possible strengthening mechanism was also discussed. These results indicated that laser polishing could be an efficient method for surface polishing of FDM parts. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48288.
机译：熔融沉积建模（FDM）通过层彼此顶部通过层产生零件，使得几乎不可能获得光滑的印刷部件。因此，对FDM印刷部件的后处理存在巨大需求。激光抛光是一种新颖的技术，可用于抛光产品以获得更平滑的表面。这项工作的目的是通过激光抛光探讨表面整理FDM印刷的聚乳酸（PLA）零件的可行性。研究了表面粗糙度，表面形态，动态力学分析（DMA）和拉伸性能。结果表明，在一定范围内的较低的激光功率和更大的激光束直径可以促进形成更平滑的表面。通过优化参数，表面粗糙度降低了90.4％。 DMA表明，由于密度结构的分子迁移率降低，PLA样品的储存模量（E'）和玻璃化转变温度显着提高。此外，激光抛光后，PLA样本的拉伸强度和杨氏模量也显着增加。观察到骨折形态，还讨论了可能的强化机制。这些结果表明，激光抛光可以是FDM部件表面抛光的有效方法。 （c）2019 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2019,136,48288。

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