连续液面成型工艺中粘附力形成的机理研究

Investigation on Formation Mechanism of Adhesion Force in Continuous Liquid Interface Production

连续液面成型工艺利用氧阻聚效应,将固化层和基底之间的固-固分离转变为固化层和液态树脂间的固-液分离,显著减小了分离力,提高了工艺的可靠性,然而在剥离瞬间固化层与液态树脂之间的粘附力仍然制约着打印速度及工艺可靠性。通过理论分析、数值模拟和试验测量对粘附力的形成机理进行了系统研究。结果表明:固化层与树脂之间的负压吸力是粘附力形成的主要原因,负压吸力随阻聚区厚度的增加而减小,随着打印截面面积的增加而增大;通过模拟连续液面成型过程,在线测量了不同阻聚区厚度下的粘附力,实验结果与理论分析和数值计算结果吻合较好。

In continuous liquid interface production (CLIP),the solid-solid separation between the cured layer and the substrate is transformed into the solid-liquid separation between the cured layer and the liquid resin by using the oxygen inhibition effect,which reduces significantly the separation force and improves the process reliability.However,the adhesion force between the cured layer and the resin still constrain the printing speed and processing reliability at the moment of printing platform moving up.In this paper,the formation mechanism of adhesion force is investigated systematically by using theoretical analysis,numerical simulation and experimental measurement.The result show that the main attribution to the adhesion force formation is the negative pressure (suction force) between the cured part and the liquid resin.The suction force decreases with the increasing of thickness of oxygen inhibition zone and increases with the increasing of section area of printing workpiece,respectively.The adhesion force with different thickness of inhibition zone are measured online through experiments by constructing the cured layer peeling process in CLIP.The experimental results are in a good agreement with the theoretical analysis and simulation results.