喷射式3D打印过程微滴沉积位置建模与预测

Modeling and Prediction of Droplet Deposition Position for Jet 3D Printing

摘要:

微滴沉积位置的准确性是影响喷射成型器件形貌精度的主要因素之一，为了对微滴沉积位置进行控制，需要建立微滴沉积位置的动态预测模型。建立了微滴在下落、沉积过程中的运动与传热模型，并通过数值仿真和实验研究了单个微滴以及两个相邻微滴在沉积动态过程中的形心位置变化，结果表明，相比于数值仿真模型，所建立的理论预测模型对单个微沉积位置预测误差为0.45%，相邻两个微滴间的沉积距离预测误差为0.5%，并通过实验进行了对比验证，表明所建理论模型具有足够高的位置预测精度，可用于微滴喷射3D打印过程中微滴沉积位置及打印轨迹在线控制的参考。

Abstract:

The accuracy of droplet deposition position is one of the main factors affecting the morphology accuracy of spray forming devices. In order to control the droplet deposition position, a dynamic prediction model for droplet deposition position needs to be established. A model for the motion and heat transfer of micro droplets during the process of falling and deposition is established, and studies the changes in the centroid position of a single micro droplet and two adjacent micro droplets during the dynamic deposition process through numerical simulation and experiment. The results show that compared to the numerical simulation model, the theoretical prediction model established has a prediction error of 0.45% for a single micro deposition position, and a prediction error of 0.5% for the deposition distance between adjacent micro droplets, and comparative verification was conducted through experiments, indicating that the established theoretical model has sufficiently high position prediction accuracy, which can be used as a reference for online control of droplet deposition position and printing trajectory in the process of droplet spraying 3D printing.