Abstract:For FDM (Fused Deposition Modeling) 3D printed moldings, the problem of relatively poor product accuracy tends to occur. Taking the fluid velocity at the outlet of the nozzle as the research direction, a fluid analysis finite element model of the nozzle was established and the Taguchi method was designed. The fluid velocity under the conditions of the length of the heating chamber, the length of the aisle and the temperature of the heating chamber was analyzed. The threedimensional model of the nozzle was established. The model was simulated using ANSYS Fluent software and the outlet section velocity cloud map was obtained. The velocity cloud map was used to analyze the variance of the velocity of the exit section, and the structure of the nozzle was optimized. Through the combination 〖JP3〗of theory and experiment, it was confirmed that the optimized nozzle effectively improved the quality accuracy. The experimental results〖JP〗 show that when the heating chamber length h1=5 mm, the silk aisle length h2=8 mm, the heating chamber temperature T=240 ℃, the accuracy of the print product is the highest, which provides reference for the structure optimization of the nozzle.