摘要
本文设计出一种应用于熔融沉积成型技术的螺杆挤出装置的进料段、挤压段结构,并基于离散单元法对挤出装置中颗粒流动特性进行了数值模拟研究。模拟中研究了螺纹形状、螺杆竖直位置、颗粒间静摩擦系数对颗粒流动特性的影响,并总结得出三种参数的变化对颗粒质量流量及相对速度标准偏差的影响规律。模拟结果表明,采用梯形螺纹时颗粒质量流量变化范围最宽,效果最理想;螺杆在进料漏斗中的竖直位置对出口颗粒质量流量无明显影响;挤出颗粒质量流量随颗粒间静摩擦系数增大而减小,出口处颗粒速度随颗粒间静摩擦系数变大而分布更加均匀。
In this paper, the structures of feed zone and extrusion zone of the screw extruder applied in the fused deposition modeling technology were designed, and the particle flow behaviors in the extruder was investigated by the discrete element method. In this work, the effect of thread shape, vertical position of the screw and static friction coefficient between particles on the particle flow behaviors were investigated. Moreover, the effect of structure parameters on the particle mass flux and relative standard deviation of velocity was concluded. The simulation results showed that the maximum range of extrusion particle mass flux was obtained when the trapezoidal thread was adopted. The vertical position of the screw has little effect on the outlet particle mass flux. Moreover, with increasing the static friction coefficient between particles, the particle mass flux of extruded particles decreases, and the particle velocity at outlet is more evenly distributed.
作者
邰曈
刘丹
张振铎
何玉荣
TAI Tong;LIU Dan;ZHANG Zhen-Duo;HE Yu-Rong(School of Energy Science and Engineering,Harbin Institute of Technology,Harbin 150001,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2018年第10期2229-2234,共6页
Journal of Engineering Thermophysics
基金
国家自然科学基金重大研究计划(No.91534112)
关键词
3D打印
挤压段
螺杆
静摩擦系数
3D printing
extrusion zone
screw
static friction coefficient
