Local composition control using an active-mixing hotend in fused filament fabrication

IF 4.2 Q2 ENGINEERING, MANUFACTURING

Additive manufacturing letters Pub Date : 2023-10-13 DOI:10.1016/j.addlet.2023.100177

Joshua T. Green , Ian A. Rybak , Jonathan J. Slager , Mauricio Lopez , Zachary Chanoi , Calvin M. Stewart , Roger V. Gonzalez

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引用次数: 1

Abstract

Additive manufacturing with local composition control is uniquely suited for the development and exploration of advanced materials with compositionally graded structures. A fused filament fabrication printer was designed with in situ composition control facilitated by using an active-mixing hotend. Stepper motors drive three filament extruders and a mixing rod in proportions instructed by a print file to control composition and material distribution within extrusions. Composition tailoring was demonstrated by printing specimens with twelve distinct regions each consisting of unique filament mixtures. Local control of composition was demonstrated by printing a variety of specimens with composition gradients having horizontal, vertical, radial, and circumferential orientations. The tensile properties of printed materials were modified by printing with mix ratios of polylactic acid and thermoplastic polyurethane. Eight blend ratios were tested in tension and have tensile moduli ranging from 17.3 to 3480 MPa. These methods demonstrate advanced capabilities that are well suited for manufacturing functionally graded structures.

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在熔丝制造中使用主动混合加热器的局部成分控制

具有局部成分控制的增材制造特别适合开发和探索具有成分梯度结构的先进材料。设计了一种熔融丝制造打印机，通过使用活性混合棒促进了原位成分控制。步进电机按打印文件指示的比例驱动三台长丝挤出机和一根混合棒，以控制挤出机内的成分和材料分布。通过印刷具有十二个不同区域的样品来证明成分剪裁，每个区域由独特的细丝混合物组成。通过打印具有水平、垂直、径向和圆周方向的成分梯度的各种样品，证明了成分的局部控制。采用聚乳酸和热塑性聚氨酯的混合比例对印刷材料的拉伸性能进行了改性。在张力下测试了八种共混比，其拉伸模量范围为17.3至3480MPa。这些方法展示了非常适合制造功能梯度结构的先进能力。

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