Among a variety of additive manufacturing technologies, constrained-surface image-projection-based stereolithography (SLA) technology has unique advantages in printing precision and commercial maturity. For the constrained-surface SLA process, separating the cured layer from the constrained surface is a crucial step that enables the fabrication of the current layer to accomplish. The separation process limits the accuracy of vertical printing and affects the reliability of fabricating. To reduce the separation force, current existing methods include coating nonsticky film, tilting the tank, sliding the tank, and vibrating the constrained glass. Compared with the above methods, the rotation-assisted separation method presented in this article has the advantages of simple structure and inexpensive equipment. The results of the simulation show that the pulling separation with rotating can reduce the separation force and shorten the separation time effectively. Besides, the timing of rotating is also crucial. A customized rotatable resin tank is used in the commercial liquid crystal display-based three-dimensional printer to reduce the separation force by breaking the vacuum environment between the cured layer and the fluorinated ethylene propylene film in advance. The analyzed results have demonstrated that this method can reduce the maximum separation force and the ultimate separation distance, and the reduction is related to the edge profile of the pattern.

中文翻译：

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约束表面立体光刻的旋转辅助分离模型


在各种增材制造技术中，基于约束表面图像投影的立体光刻（SLA）技术在打印精度和商业成熟度方面具有独特的优势。对于约束表面 SLA 工艺，将固化层与约束表面分离是实现当前层制造的关键步骤。分离工艺限制了垂直印刷的精度并影响制造的可靠性。为了减小分离力，目前现有的方法有涂不粘膜、倾斜罐体、滑动罐体、振动约束玻璃等。与上述方法相比，本文提出的旋转辅助分离方法具有结构简单、设备廉价的优点。仿真结果表明，旋转牵引分离可以有效减小分离力，缩短分离时间。此外，轮换的时机也很重要。商用液晶显示器三维打印机采用定制的可旋转树脂槽，通过预先打破固化层与氟化乙烯丙烯薄膜之间的真空环境来减少分离力。分析结果表明，该方法可以减小最大分离力和极限分离距离，且减小量与图案的边缘轮廓有关。