金属微滴水平喷射关键参数调控机制及试验

doi:10.7527/S1000-6893.2020.24637

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金属微滴水平喷射关键参数调控机制及试验

黄杰光, 齐乐华, 罗俊

西北工业大学机电学院, 西安 710072

收稿日期:2020-08-13 修回日期:2020-09-15 发布日期:2020-10-30
通讯作者: 齐乐华 E-mail:qilehua@nwpu.edu.cn
基金资助:
国家自然科学基金（51772245）；中央高校基本科研业务费专项资金（3102019ZX049）

Experimental research and regulation mechanism of critical parameters on horizontal ejection of metal droplets

HUANG Jieguang, QI Lehua, LUO Jun

School of Mechanical Engineering, Northwestern Polytechnical University, Xi'an 710072, China

Received:2020-08-13 Revised:2020-09-15 Published:2020-10-30
Supported by:
National Natural Science Foundation of China (51772245); The Fundamental Research Funds for the Central Universities (3102019ZX049)

摘要/Abstract

摘要： 均匀金属微滴喷射3D打印技术是一种极具应用前景的空间金属增材制造技术，明晰其重力敏感度是实现该技术空间化应用的前提。在地基条件下，将熔滴喷射沉积方向翻转至水平状态是直观反映其打印过程重力效应的有效方法。针对熔滴水平稳定喷射调控的难题，建立了熔滴水平喷射流体力学模型及压电激振动力学模型，通过试验，探究了熔滴水平喷射不稳定形成机制，明晰了不同喷射行为下的激振特性，揭示了熔滴水平稳定喷射调控规律。结果表明：压电模块驱动信号（脉宽、幅值）对激振杆振动特性影响极为显著，激振杆行程随幅值或脉宽的增加呈现出先增加后减小的变化规律；通过改变激振杆振动特性可调控熔滴直径、初始喷射速度及喷射稳定性，熔滴直径随幅值增大而减小，但受脉宽影响不大，而喷射速度与幅值及脉宽均正相关。基于此，试验得到了尺寸均匀的金属熔滴，并水平沉积打印出与设计模型一致的结构特征。

关键词: 金属微滴, 水平喷射, 调控机制, 激振特性, 太空金属增材制造

Abstract: Uniform metal droplet ejection 3D printing technology is a promising space-based metal Additive Manufacturing (AM) technology. Understanding the gravity sensitivity is the premise to realize its application in space. Under ground condition, it is able to intuitively exhibit the gravity effects on printing processes by overturning the ejection and deposition direction to a horizontal state. Here, toward the challenge of realizing the stable horizontal ejection of metal droplets, a fluid dynamics model and a kinetic model of piezoelectric vibrator during the process of droplet horizontal ejection are established. The mechanisms on unstable ejection are experimentally investigated, the vibration characteristics of different ejection behaviors are ascertained, and the regulation law of stable horizontal ejection is unveiled. The results show that the vibration characteristic of the vibrator rod depends on the drive signal (pulse duration, amplitude) of piezoelectric module. With the growth of the amplitude or pulse duration, the vibrator travel increases at first, but then decrease. In addition, the diameter, initial velocity, and injection stability of the droplet can be effectively tailored by modulating the vibration characteristic of the vibrator rod. The droplet diameter decreases with the increase of the amplitude, and the droplet velocity is both positively correlated with the amplitude and pulse duration. Based on these findings, uniform metal droplets are experimentally obtained, and structures that agreed with the designed models are printed through droplets horizontal deposition.

Key words: metal droplet, horizontal ejection, regulation mechanism, vibration characteristic, metal additive manufacturing in space

中图分类号:

V460

黄杰光, 齐乐华, 罗俊. 金属微滴水平喷射关键参数调控机制及试验[J]. 航空学报, 2021, 42(10): 524637-524637.

HUANG Jieguang, QI Lehua, LUO Jun. Experimental research and regulation mechanism of critical parameters on horizontal ejection of metal droplets[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021, 42(10): 524637-524637.

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金属微滴水平喷射关键参数调控机制及试验

Experimental research and regulation mechanism of critical parameters on horizontal ejection of metal droplets

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