微流挤出3D打印机螺杆混合性能仿真分析OA

In order to mitigate extrusion delay caused by variations in material component ratios during the fabrication of functionally gradient materials,three mixing screw structures suitable for microfluidic extrusion 3D printers are proposed,and their mixing performance is compared and analyzed.Through simulation analysis of key indicators such as the mixing coefficient and distribution index of the slurry,as well as the shear strength,extrusion flow rate and pressure gradient of the mixing screw,the optimal mixing screw structure was determined.The results showed that incorporating cylindrical threaded elements significantly enhanced the radial mixing capability of the mixing screw,increased the shear frequency and shear stress,and expanded the high-shear zone,thereby improving the mixing efficiency.Compared with the non-threaded screw,the shear stress and shear rate of the cylindrical threaded screw increased by 9.75%and 9.79%respectively,while the mixing uniformity of the slurry improved by 28.20%.However,the integration of threaded elements also affected the transport efficiency of the slurry,consequently engendering a 12.28%diminution in extrusion flow rate of the 3D printer.Moreover,the research demonstrated that adjusting the rotational speed of the mixing screw and the solid content of the slurry could improve the rheological properties of the slurry.These measures had the capacity to enhance the quality and efficiency of functional gradient material preparation,while concomitantly reducing extrusion delay time.The research results provide theoretical guidance and reference for the structural design of mixing screws in microfluidic extrusion 3D printers.