Liu Chen, Xu Kai, Zhang Yongqi, Hu Haifei, Tao Xiaoping, Zhang Zhiyu, Deng Weijie, Zhang Xuejun
Key Laboratory of Optical System Advanced Manufacturing Technology, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
Materials (Basel). 2022 Jun 29;15(13):4562. doi: 10.3390/ma15134562.
Three-dimensional printing, also called additive manufacturing (AM), offers a new vision for optical components in terms of weight reduction and strength improvement. A truss, which is a triangulated system of members that are structured and connected in such a way that they mainly bear axial force, is commonly used in steel structures to improve stiffness and reduce weight. Combining these two technologies, an extremely lightweight truss-structured mirror was proposed. First, the finite element analyses (FEA) on surface shape deviation and modal properties were carried out. Results showed that the mirrors had sufficient stiffness and a high weight reduction of up to 85%. In order to verify their performance, the truss-structured mirror blanks were fabricated with AM technology. After that, both the preprocessing and the postprocessing of the mirrors were carried out. The results show that without NiP coating, a surface shape deviation of 0.353λ (PV) and 0.028 λ (RMS) (λ = 632.8 nm) with a roughness of Ra 2.8 nm, could be achieved. Therefore, the truss-structured mirrors in this study have the characteristics of being extremely lightweight and having improved stiffness as well as strong temperature stability.
三维打印，也称为增材制造（AM），在减轻重量和提高强度方面为光学元件提供了新的愿景。桁架是一种由构件组成的三角形系统，其结构和连接方式使其主要承受轴向力，常用于钢结构中以提高刚度和减轻重量。结合这两种技术，提出了一种极轻的桁架结构镜。首先，对表面形状偏差和模态特性进行了有限元分析（FEA）。结果表明，这些镜子具有足够的刚度，减重高达85%。为了验证其性能，采用增材制造技术制造了桁架结构镜坯。之后，对镜子进行了预处理和后处理。结果表明，在没有镀NiP的情况下，表面形状偏差可达0.353λ（PV）和0.028λ（RMS）（λ = 632.8 nm），粗糙度为Ra 2.8 nm。因此，本研究中的桁架结构镜具有极轻、刚度提高以及温度稳定性强的特点。
