中国塑料2017，Vol.31Issue(7)：126-131,6.DOI:10.19491/j.issn.1001-9278.2017.07.021
阀控式熔体微分3D打印机工作特性的研究
Study on Operating Characteristics of Valve Controlled Melt Differential 3D Printers
摘要
Abstract
This paper presented a valve-controlled melt differential pellet 3D printer used for direct print with a variety of plastic particles and also simulated the extrusion process of non-Newtonian fluid in the valve cavity by using a multiphase flow and a dynamic grid technique.It was found that there is a positive correlation between extrusion flow rate and downward speed of the valve needle as well as between the ratio of valve needle and valve cavity diameters.The closer the valve needle to the nozzle,the greater the diameter ratio,and the greater the fluctuation of flow rate.The optimal valve needle movement distance could be determined as 0.5～1 mm.Moreover,the extrusion flow rate was improved with an increase of the ratio of the valve and valve cavity diameters.The larger the diameter ratio,the greater the fluctuation of flow rate.The melt exhibited a beck flow phenomenon,when the ratio of the valve needle movement speed and back pressure was greater than 0.5.When the process parameters were accurately controlled,the steady extrusion could be realized and the precision of molded parts could be improved.关键词
三维打印/熔体微分/阀控系统/动网格技术Key words
three dimensional printing/melt differential/valve-controlled system/dynamic grid technology分类
化学化工引用本文复制引用
熊韩,焦志伟,迟百宏,刘晓军,杨卫民..阀控式熔体微分3D打印机工作特性的研究[J].中国塑料,2017,31(7):126-131,6.基金项目
国家自然科学基金青年基金资助项目(51403014) （51403014）
广东省省级科技计划项目(2016B090915001) （2016B090915001）
