Additive ram material extrusion and diddling of fully compounded thermoset nitrile rubber
Additive ram material extrusion and diddling of fully compounded thermoset nitrile rubber
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全复合热固性丁腈橡胶添加剂冲压材料挤出及混炼
DOI：
10.1002/pc.26218
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发表时间：
2021
影响因子：
5.2
通讯作者：
Mead, Joey L.
中科院分区：
文献类型：
--
作者：
Kazmer, David O.;Kodra, Stiven;Mubasshir, Abdullah A.;Keaney, Erin E.;Mead, Joey L.
柱塞式挤出机用于高压挤出全复合热固性橡胶，以实现增材制造。挤出机使用由齿轮步进电机驱动的活塞来提供温控桶中橡胶装料的体积排量。与活化剂、促进剂和硫化剂一起，该橡胶混合物的配方为每 100 份丁腈橡胶 30 份炭黑。蛇形图案组以相对于负载方向的平行和横向方向印刷。从打印到后固化，打印的样本在打印方向上表现出 65% 的线性收缩。尽管与通过材料挤出的典型增材制造零件相比，打印样品的空隙率相对较低，但相对于相同橡胶化合物的压缩成型样品，观察到拉伸性能显着下降。压缩成型样品的平均失效应变为 462%，而平行和横向打印样品的平均失效应变为 347% 和 183%。为了减少收缩并增加挤出道路之间的界面面积，采用了倒缝和正弦波欺骗模式，以沿打印路径叠加周期为 1mm 的振荡运动。据观察，与常规蛇形图案相比，印有涂鸦图案的样品收缩率更小，性能也得到改善。对于倒缝和正弦波图案，横向方向的平均失效应变分别增加至 218% 和 265%。讨论了建议的未来研究，并在附录中提供了欺骗程序。
A ram extruder is described for high‐pressure extrusion of fully compounded thermoset rubber to achieve additive manufacturing. The extruder uses a piston driven by a geared stepper motor to provide volumetric displacement of the rubber charge residing in a temperature‐controlled barrel. Along with activators, accelerators, and a vulcanizing agent, the rubber compound is a formulation of 30 parts carbon black per hundred parts nitrile rubber. Sets of serpentine patterns are printed in parallel and transverse orientations relative to the load direction. From printing to post‐cure, the printed specimens exhibited linear shrinkage of 65% in the print direction. Although printed samples had relatively low void content compared with typical additively manufactured parts by material extrusion, significant decreases in the tensile properties were observed relative to compression‐molded specimens of the same rubber compound. The mean strain to failure was observed as 462% for compression‐molded samples, compared with 347% and 183% for printed specimens with parallel and transverse orientations. To reduce the shrinkage and increase the interfacial area between extruded roads, backstitch and sinewave diddling patterns were implemented to superimpose oscillatory motions along the print path with a periodicity of 1 mm. The specimens printed with the diddling patterns were observed to provide less shrinkage and improved properties compared to the regular serpentine patterns. The mean strain to failure in the transverse orientation, respectively, increased to 218% and 265% for the backstitch and sinewave patterns. Suggested future research is discussed, and the diddling program is provided in the appendix.
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