• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2020, Vol. 56 ›› Issue (9): 243-251.doi: 10.3901/JME.2020.09.243

• 制造工艺与装备 • 上一篇    下一篇

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基于微滴喷射3D打印的纳米颗粒悬浮墨水稳定喷射研究

朱东彬, 吴民强, 王竹贤, 杨伟东   

  1. 河北工业大学机械工程学院 天津 300130
  • 收稿日期:2019-05-14 修回日期:2019-11-19 出版日期:2020-05-05 发布日期:2020-05-29
  • 作者简介:朱东彬,男,1975年出生,博士,副教授,硕士研究生导师。主要研究方向为增材制造。E-mail:zhudongbin@hebut.edu.cn
  • 基金资助:
    河北省自然科学基金资助项目(E2018202200,E2016202297)。

Research on Stable Jetting of Nanoparticle Suspension Ink for Inkjet 3D Printing

ZHU Dongbin, WU Minqiang, WANG Zhuxian, YANG Weidong   

  1. School of Mechanical Engineering, Hebei University of Technology, Tianjin 300130
  • Received:2019-05-14 Revised:2019-11-19 Online:2020-05-05 Published:2020-05-29

摘要: 微滴喷射3D打印工艺中,墨水以单一液滴形式稳定喷射是保证喷墨打印质量的必要条件。但在微滴喷射瞬间,纳米颗粒悬浮墨水的流变学性能会随着剪切速率发生明显变化,对实现墨滴稳定喷射具有重要影响。通过测量墨水黏度与剪切速率之间的关系,建立变黏度喷墨打印有限元模型,并对微滴喷墨打印过程中墨滴黏度、墨滴速度、墨滴形貌的变化规律及影响机理进行研究。得出毛细管力是导致墨滴失稳的重要因素,最后对墨滴稳定喷射进行了数值模拟和物理试验验证,证明毛细管数-奥内佐格倒数(Capillary-ohnesorge reciprocal,CA-Z)纳米颗粒悬浮墨水稳定喷射评价方法的可行性。CA-Z纳米颗粒悬浮墨水稳定喷射评价方法为微滴喷射3D打印墨水的制备及其打印参数的优化提供了理论和试验依据。

关键词: 微滴喷射3D打印, 稳定喷射, 数值模拟, 纳米颗粒悬浮墨水, 增材制造

Abstract: In the inkjet 3D printing process, stable jetting of ink in the form of a single droplet is an important factor affecting the quality of inkjet printing. However, at the moment of micro-droplet ejection, rheology of the nanoparticle suspension ink changes with the shear rate significantly, affecting the stable ejection of micro-droplet. The inkjet printing finite element model with variable viscosity is established by building the relationship between ink viscosity and shear rate. And the variation rule and effect mechanism of droplet viscosity, droplet speed and droplet morphology during inkjet printing process are studied. It is confirmed that capillary force is an important factor leading to the instability of droplets. In the end, CA-Z (Capillary-ohnesorge reciprocal, CA-Z) evaluation method for stable jetting of the nanoparticle suspension ink is proved by micro-droplet ejection experiment and numerical simulation, which offered theoretical and experimental basis for the preparation of nanoparticle suspension ink and the optimization of inkjet 3D printing parameters.

Key words: inkjet 3D printing, stable injection, numerical simulation, nanoparticle suspension ink, additive manufacturing

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