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首页> 外文期刊>The International Journal of Advanced Manufacturing Technology >Research on mechanism of generating aluminum droplets smaller than the nozzle diameter by pneumatic drop-on-demand technology
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Research on mechanism of generating aluminum droplets smaller than the nozzle diameter by pneumatic drop-on-demand technology

机译：通过气动滴下技术产生小于喷嘴直径的铝液滴的机理研究

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摘要

Droplet-based manufacturing (DBM) process has great potential in directly fabricating metal parts. In order to enhance the practicability of DBM, decreasing droplet size becomes the research focus in this field. In the present work, a novel pneumatic-driven droplet generator structure was proposed and the mechanism of generating aluminum droplets smaller than the nozzle diameter was studied. By conducting simulation experiments, the effects of structure parameters on droplet formation process and droplet size were investigated. The results indicated that the aspect ratio of the nozzle hole (i) and the distance between inlet hole and nozzle hole (H (1)) had significant effects on droplet size while the diameter of the inlet hole had little effect. Droplets smaller than the nozzle diameter could be produced only when i and H (1) were 1 and 1 mm, respectively. Based on the optimized structure parameters, a generator was developed and droplet-ejecting experiments were carried out. By using a nozzle with the diameter of 500 mu m, aluminum droplets with the mean diameter of 359.9 mu m were produced stably and then a rectangular tube was fabricated by depositing droplets sequentially. The results demonstrated the capability of the novel generator to produce small droplets and to fabricate parts directly.
机译：基于液滴的制造（DBM）工艺在直接制造金属部件方面具有很大的潜力。为了提高DBM的实用性，降低液滴尺寸成为该领域的研究重点。在本作工作中，提出了一种新型气动驱动的液滴发生器结构，并研究了产生小于喷嘴直径的铝液滴的机构。通过进行仿真实验，研究了结构参数对液滴形成过程和液滴尺寸的影响。结果表明，喷嘴孔（i）的纵横比和入口孔和喷嘴孔之间的距离（H（1））对液滴尺寸的显着影响，而入口孔的直径几乎没有效果。仅当I和H（1）分别为1和1mm时，才能产生小于喷嘴直径的液滴。基于优化的结构参数，开发了发电机，并进行液滴喷射实验。通过使用直径为500μm的喷嘴，稳定地制造具有平均直径为359.9μm的铝液滴，然后通过顺序沉积液滴来制造矩形管。结果表明了新型发电机能够生产小液滴和直接制造零件的能力。

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