Process and material behavior modeling for a new design of micro-additive fused deposition
Process and material behavior modeling for a new design of micro-additive fused deposition
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DOI：
10.1007/s00170-012-4686-y
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发表时间：
2013-08-01
影响因子：
3.4
通讯作者：
Marrero, Maria D.
中科院分区：
文献类型：
--
作者：
Monzon, Mario D.;Gibson, Ian;Marrero, Maria D.
本文的目的是探索使用聚合物挤出的增材制造的限制和特殊要求，其喷嘴直径远小于传统喷嘴直径：0.050 mm。这项工作的重点是喷嘴的设计和分析的影响，这样一个减少的直径上的挤压过程和材料的冷却，而被沉积在零件上。该方法是基于从传统的熔融沉积建模技术开始的实验和理论研究，该研究测试了沉积过程中灯丝材料的膨胀和冷却。实验工作被用来评估的理论模型和第一法向应力方程，估计在0.087克/小时的质量速率的膨胀因子（直径）为1.249的有效性。塑料部件上的对流系数（h）在第一沉积层上估计为7 W/m（2）K;远低于一些参考文献显示的值。
The aim of this paper is to explore the limits and special requirements for additive manufacturing using polymer extrusion with a nozzle diameter much smaller than the conventional one: 0.050 mm diameter. This work is focused on the nozzle design and analyzes the effect of such a reduced diameter on the extrusion process and on the cooling of material while being deposited on the part. The approach is based on experimental and theoretical studies starting from conventional fused deposition modeling technology where the study tested swelling and cooling of filament material during deposition. Experimental work was used to assess the validity of the theoretical model and the first normal stress equation which estimated a swelling factor (diameter) of 1.249 at 0.087 g/h mass rate. The convection coefficient (h) on the plastic part was estimated as7 W/m(2) K on the first deposited layer; considerably lower than some references show.