Considering the problems faced by Fused Deposition Modeling (FDM) 3D printing equipment, including limited consumables choices and unstable extrusion rate as well as difficult prints precision control, etc., a new type of 3D printing molding equipment was designed following the current screw extrusion technology combined with 3D printing molding mechanism. Also, the optimal matching relation between the rotational speed of the screw, which is the core of the equipment, and the feed rate of the nozzle was determined. The POLYFLOW, the software of finite element numerical simulation, was employed for analyzing the performance of the screw module under different working conditions. The result revealed that the outlet fluid pressure derived from the theoretical calculation (1.48 MPa) was close to the simulation value of 1.51 MPa, and the volumetric flow rate at the outlet derived from theoretical calculation 3.51 × 10^–8(m³/s) was close to the value obtained from simulation (3.18 × 10^–8 (m³/s). Those findings indicated that the material could be extruded at a constant output rate; with the increase of the screw lead size, the pressure build-up capacity of screw improved, and the pressure fluctuation and velocity change became more intensive; therefore, the lead within the range of 24 ~ 36 mm should be the suitable choice for the application in actual production; the reduction of the rational speed resulted a lower shear rate, therefore, the screw rotational speed should be optimized within the reasonable range of 8 ~ 15r/min (N_max ~ N_min) and the feed rate of nozzle should be selected within the range of 1043.33 ~ 746.24 mm/min (V_Fmax ~ V_Fmin).

针对Fused Deposition Modeling (FDM) 3D打印设备面临的耗材选择有限、挤出速率不稳定以及打印精度控制困难等问题，设计了一种新型3D打印成型设备，沿用目前的螺杆挤出技术结合3D打印成型机制。此外，确定了作为设备核心的螺杆转速与喷嘴进料速度之间的最佳匹配关系。采用有限元数值模拟软件POLYFLOW分析螺杆模块在不同工况下的性能。结果表明，理论计算得出的出口流体压力（1.48 MPa）接近模拟值1.51 MPa，^–8 (m ³ /s) 接近模拟得到的值 (3.18 × 10 ^–8 (m ³ /s)。这些结果表明材料可以以恒定的输出速率挤出；随着螺杆的增加导程尺寸增大，螺杆的建压能力提高，压力波动和速度变化更加剧烈，因此，24～36mm范围内的导程应是实际生产中应用的合适选择；合理转速导致剪切速率较低，因此螺杆转速应优化在8～15r/min（N _max  ～  N _min）的合理范围内) 且喷嘴的进给速度应选择在 1043.33 ~ 746.24 mm/min ( V _Fmax  ~  V _Fmin ) 范围内。