A Vibration-Assisted Separation Method for Constrained-Surface-Based Stereolithography
A Vibration-Assisted Separation Method for Constrained-Surface-Based Stereolithography
复制标题
DOI：
10.1115/1.4048445
复制
发表时间：
2020-09
期刊：
影响因子：
--
通讯作者：
Yang Xu;Yizhen Zhu;Yifeng Sun;Jie Jin;Yong Chen
中科院分区：
文献类型：
--
作者：
Yang Xu;Yizhen Zhu;Yifeng Sun;Jie Jin;Yong Chen
对于基于自下而上的立体光刻（SL）工艺，需要分离工艺以在制造工艺中将新固化的层从受约束的表面分离。过大的分离力会导致构建层和约束表面损坏。不同的表面涂层，平台运动，包括倾斜和滑动，以及利用透氧膜已被开发，以解决分离相关的问题。在这些方法中，振动辅助（VA）分离方法，以减少分离力的研究有限。基于VA分离的方法的潜在机制仍然未被探索，并且在基于自底向上的SL过程中使用VA分离的最佳方式仍然不清楚。本文提出了一种新的SL工艺VA分离设计。建立了一个原型系统来研究VA分离机理。对不同振动频率、预应力水平和暴露面积下的分离性能进行了实验研究。基于分离力数据，建立了基于疲劳断裂力学的分析模型。研究并比较了不同形状、尺寸和拓扑结构下的分离行为。结果表明，使用基于VA分离的方法，SL中的分离力显著降低。此外，分离力和分离时间之间的关系符合基于应力的疲劳模型。该研究还提供了如何选择工艺参数的见解，考虑分离力和建筑效率之间的权衡。
For the bottom-up based stereolithography (SL) process, a separation process is required to detach the newly cured layer from the constrained surface in the fabrication process. Excessive separation force will cause damage to the built layers and the constrained surface. Different surface coatings, platform motions including tilting and sliding, and the utilization of oxygen-permeable films have been developed to address the separation-related problems. Among these approaches, the vibration-assisted (VA) separation method to reduce the separation force has limited study. The underlying mechanism of the VA separation-based method remains unexplored, and the best way to use VA separation in the bottom-up based SL process is still unclear. In this paper, a new VA separation design for the SL process is presented. A prototype system was built to study the VA separation mechanism. Experiments on the separation performance under different parameters, including vibration frequency, pre-stress level, and exposure area, were conducted. Based on the collected separation force data, an analytical model based on the mechanics of fatigue fracture was built. The separation behaviors related to different shape size and topology were also studied and compared. The results showed that the separation force in SL was significantly reduced using the VA separation-based method. Furthermore, the relationship between the separation force and the separation time conforms to the stress-based fatigue model. This study also provides insights on how to choose process parameters by considering the trade-offs between separation force and building efficiency.