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用于高粘度熔融液体的3D喷射打印机的研发

Research and Development of a 3D Jet Printer for High-Viscosity Molten Liquids.

作者信息

Yang Yang, Gu Shoudong, Liu Jianfang, Tian Hongyu, Lv Qingqing

机构信息

School of Mechanical and Aerospace Engineering, Jilin University, No. 5988, Renmin Road, Changchun 130025, China.

出版信息

Micromachines (Basel). 2018 Oct 28;9(11):554. doi: 10.3390/mi9110554.

DOI:10.3390/mi9110554
PMID:30715053
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6266737/
Abstract

Micro-droplet jetting manufacture is a new 3D printing technology developed in recent years. Presently, this new technology mainly aims at ejecting a low-viscosity medium. Therefore, a device for ejecting high-viscosity molten liquid is designed by analyzing the injection principle of high-viscosity molten liquid. Initially, the cooling mechanism is designed to overcome the defect that the piezoelectric stacks cannot operate in high-temperature conditions. Thereafter, the mathematical model of the liquid velocity in the nozzle is derived, and the factors influencing injection are verified by Fluent. Subsequently, a prototype of the jet printer is fabricated, and the needle velocity is tested by the laser micrometer; the relationship between voltage difference and the needle velocity is also obtained. The experimental results matched the theoretical model well, showing that the voltage difference, needle radius, nozzle diameter, and taper angle are closely related to the injection performance of the 3D jet printer. By using a needle with a radius of 0.4 mm, a nozzle with a diameter of 50 μm, a taper angle of 90°, a supply pressure of 0.05 Mpa, and a voltage difference of 98 V, a molten liquid with a viscosity of 8000 cps can be ejected with a minimum average diameter of 275 μm, and the variation of the droplet diameter is within ±3.8%.

摘要

微滴喷射制造是近年来发展起来的一种新型3D打印技术。目前，这项新技术主要用于喷射低粘度介质。因此，通过分析高粘度熔融液体的喷射原理，设计了一种用于喷射高粘度熔融液体的装置。首先，设计冷却机制以克服压电堆栈无法在高温条件下工作的缺陷。此后，推导了喷嘴内液体速度的数学模型，并通过Fluent验证了影响喷射的因素。随后，制作了喷射打印机的原型，并使用激光测微仪测试了针速度；还获得了电压差与针速度之间的关系。实验结果与理论模型吻合良好，表明电压差、针半径、喷嘴直径和锥角与3D喷射打印机的喷射性能密切相关。使用半径为0.4mm的针、直径为50μm的喷嘴、90°的锥角、0.05Mpa的供应压力和98V的电压差，可以喷射粘度为8000cps的熔融液体，最小平均直径为275μm，液滴直径的变化在±3.8%以内。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cf16/6266737/16d2567837af/micromachines-09-00554-g019.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cf16/6266737/255351ccdb5f/micromachines-09-00554-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cf16/6266737/0384b456221a/micromachines-09-00554-g002.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cf16/6266737/718285424856/micromachines-09-00554-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cf16/6266737/275f39377ec4/micromachines-09-00554-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cf16/6266737/05d08a7cd14b/micromachines-09-00554-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cf16/6266737/7366b1cdb892/micromachines-09-00554-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cf16/6266737/6a20cb89c58a/micromachines-09-00554-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cf16/6266737/74f32355ff35/micromachines-09-00554-g013.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cf16/6266737/f0262a3a5c3e/micromachines-09-00554-g014.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cf16/6266737/4c140a4fea13/micromachines-09-00554-g015.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cf16/6266737/bff0bf453030/micromachines-09-00554-g016.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cf16/6266737/628372a7770d/micromachines-09-00554-g017.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cf16/6266737/63f389f2162a/micromachines-09-00554-g018.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cf16/6266737/16d2567837af/micromachines-09-00554-g019.jpg

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