In the present work, a micro‐extrusion‐based three‐dimensional (3D) printing process has been used to fabricate a metal‐polymer‐based green body. The fabricated parts consisted of carbonyl iron particles with a binder (polylactic acid) and a solvent mixture. From the pilot experiments, it was found that the process parameters, namely, Fe loading, layer thickness,and infill density, affect the green density, shrinkage, and surface roughness of the fabricated part. Moreover, to develop a statistical model with significant factors, experiments were performed based on the design of the experiment using a central composite design method. The experimental results revealed that green density and surface roughness of 3D printed parts increased with the increase in Fe loading and infill density. On the contrary, the shrinkage in the fabricated part decreased with an increase in Fe loading and increased with the rise in infill density. Further, with an increase in layer thickness, the green density decreased while shrinkage and roughness were observed to increase. To verify the accuracy of the developed model, confirmation experiments were also performed at the optimum set of process parameters obtained by the genetic algorithm optimization technique.

中文翻译：

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通过基于微挤压的3D打印工艺开发的生坯制造的实验研究

在当前的工作中，基于微挤压的三维（3D）打印工艺已用于制造基于金属聚合物的生坯。制成的零件由具有粘合剂（聚乳酸）和溶剂混合物的羰基铁颗粒组成。从试实验中，发现该工艺参数，即，铁装载，层厚度，和填充密度，影响生零件的生坯密度，收缩率和表面粗糙度。此外，为了开发具有重要因素的统计模型，基于实验的设计，使用中央综合设计方法进行了实验。实验结果表明3D打印部件的生坯密度和表面粗糙度随着铁含量和填充密度的增加而增加。相反，随着Fe含量的增加，制造零件的收缩率降低，而随着填充密度的增加，收缩率也增加。此外，随着层厚度的增加，生坯密度降低，同时观察到收缩率和粗糙度增加。为了验证开发模型的准确性，