挤出方式对黏弹性浆料3D打印出料可控性的影响  

Influence of extrusion methods on discharging controllability of 3D printing with viscoelastic slurry

作　　者：郑镭 孙维连[1] 孙铂[1] 张雪静 纪宏超 ZHENG Lei;SUN Wei-lian;SUN Bo;ZHANG Xue-jing;JI Hong-chao(College of Mechanical and Electrical Engineering,Hebei Agricultural University,Baoding 071001,Hebei,China;College of Mechanical Engineering,North China University of Science and Technology,Tangshan 063210,Hebei,China;National Center for Materials Service Safety,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]河北农业大学机电工程学院,河北保定071001 [2]华北理工大学机械工程学院,河北唐山063210 [3]北京科技大学国家材料服役安全科学中心,北京100083

出　　处：《材料工程》2020年第3期134-141,共8页Journal of Materials Engineering

基　　金：河北省教育厅项目(2018101002792);河北省青年科学基金项目(E2017209059);华北理工大学研究生创新项目(2018S21)

摘　　要：基于挤出工艺的陶瓷3D打印技术应用过程中,不同挤出方式对出料速率可控性存在重要影响,从而导致打印样件在表面质量及打印成功率方面存在明显差异。针对这一问题,研究选择柱塞和螺杆两种挤出方式,在Bingham黏弹性流体浆料及0.6 mm喷嘴直径的基本条件下,结合现场实验数据和模拟仿真得出的出料速率变化曲线,对柱塞与螺杆两种挤出方式的3D打印效果进行对比分析。结果表明:螺杆挤出方式在0.03 s内,出料速率已降至原始出料速率的30%以下,而柱塞挤出方式达到该出料速率所需的时间为2.4 s,在停止供料的0.27 s内柱塞挤出方式的出料量是螺杆挤出方式出料量的3倍。通过流场分析发现黏弹性浆料条件下两种挤出装置的驱动原理不同是造成该差异的主要原因。In the application of ceramic 3 D printing technology based on extrusion process, it was found that different extrusion methods have important influence on the controllability of the discharging speed, which leads to obvious difference in the surface quality and the success rate of printing samples. For this problem, two kinds of extruding devices with plunger and screw were selected. Under the basic conditions of Bingham viscoelastic fluid slurry and 0.6 mm nozzle diameter, the 3 D printing effect of the two kinds of equipment was compared and analyzed by combining the printing test data and the simulation discharge velocity curve. The results show that the discharging speed of screw extrusion method decreases below 30% than that of the original in 0.03 s, the time required to reach this discharge speed by the plunger extrusion method is 2.4 s. The discharge amount of the plunger extrusion method is 3 times that of the screw extruder method in 0.27 s after the slurry feed is stopped. The flow field analysis shows that the different driving principle of the two extrusion methods under viscoelastic slurry condition is the main reason for this difference.

关 键 词：陶瓷3D打印 黏弹性浆料 挤出装置 出料速率 

分 类 号：TB332[一般工业技术—材料科学与工程] TH164[机械工程—机械制造及自动化]