摘要
针对熔融沉积成型(Fused Deposition Modeling,FDM) 3D打印设备耗材选择范围有限、打印材料挤出不稳定、喷头易堵塞等问题,基于3D打印成型原理,设计了一种新型双螺杆挤出式3D打印成型设备。通过有限元软件ANSYS对喷头结构进行了流场、温度场和应力场的数值模拟分析。结果表明,热流道内温度场分布均匀,从喷头入口到喷嘴出口的温度基本保持一致,达到了恒温控制的要求;压降型喷头结构能有效缓减喷头内部压力,并且,可以使喷头内热塑性高聚合物流体流动流畅,在拐角壁处无明显的速度滞留,在喷嘴出口处无回流和溢流现象,流速分布稳定;喷头等效应力分布均匀,且喷嘴热变形较小,能满足热塑性高聚合物流体的截面成型精度要求。因此,该新型喷头结构设计合理。
Based on the principle of 3D printing,a new type of 3D printing equipment with twin-screw extruder was designed to solve the problems of limited selection of consumables,unstable extrusion of printing materials,and easy clogging of nozzle.The flow field,temperature field and stress field of the nozzle structure were simulated by the finite element software ANSYS.The simulation results showed that the temperature field in the hot runner was evenly distributed,and the temperature from the nozzle inlet to the nozzle outlet was basically the same,meeting the requirements of constant temperature control;the pressure drop type nozzle structure could effectively reduce the internal pressure of the nozzle and make the flow of thermoplastic high polymer fluid in the nozzle smooth,no obvious velocity retention at the corner wall,no reflux and overflow at the nozzle outlet,and the velocity distribution was stable;the equivalent stress distribution of the nozzle was uniform and the nozzle thermal deformation was small,which could meet the cross-section molding accuracy requirements of thermoplastic high polymer fluid,so it was said that the structure design of the new nozzle was reasonable.
作者
秦望
白海清
贾仕奎
张奇锋
曹乐
安熠蔚
QIN Wang;BAI Haiqing;JIA Shikui;ZHANG Qifeng;CAO Le;AN Yiwei(College of Mechanical Engineering,Shaanxi University of Technology,Hanzhong,Shaanxi 723001,China;Shaanxi Key Laboratory of Industrial Automation,Hanzhong,Shaanxi 723001,China;College of Materials Science and Engineering,Shaanxi University of Technology,Hanzhong,Shaanxi 723001,China)
出处
《塑料》
CAS
CSCD
北大核心
2020年第3期52-57,89,共7页
Plastics
基金
国家自然科学基金(51703121)
中国博士后科学基金特别资助项目(2018T111050)
陕西理工大学研究生创新基金(SLGYCX1923)。
关键词
双螺杆挤压
3D打印喷头
有限元分析
热力耦合
温度场
应力场
twin-screw extrusion
3D printing nozzle
finite element analysis
thermo-mechanical coupling
temperature field
stress field
作者简介
秦望(1992-),男,在读硕士研究生,主要从事数字化制造技术等方面的研究;通信作者:白海清(1970-),男,硕士,教授,主要从事数字化制造和机电系统监测控制技术等研究。E-mail:snutbret@live.com。
