碳纤维复合材料格栅反射面研制进展  

Development Progress of Carbon Fiber Composite Grid Reflector

作　　者：鞠博文 郝旭峰 史耀辉 徐宏涛 唐靳梅 张尉博 钱元[3] 田杰 王宇[4] JU Bowen;HAO Xufeng;SHI Yaohui;XU Hongtao;TANG Jinmei;ZHANG Weibo;QIAN Yuan;TIAN Jie;WANG Yu(Shanghai Composite Material Science & Technology Co. Ltd, Shanghai 201112,China;Shanghai EngineeringTechnology & Research Center of Aerospace Resin Based Composite, Shanghai 201112,China;Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008,China;Nanjing University of Aeronautics and Astronautics, Nanjing 210016,China)

机构地区：[1]上海复合材料科技有限公司,上海201112 [2]上海航天树脂基复合材料工程技术研究中心,上海201112 [3]中科院紫金山天文台,南京210008 [4]南京航空航天大学,南京210016

出　　处：《空间电子技术》2019年第2期68-73,共6页Space Electronic Technology

摘　　要：为了满足某太赫兹天线高精度、高稳定的需求,采用线膨胀系数极低的全碳纤维格栅结构制备半径为1.2m的反射面。文章首先运用有限元法计算了全碳纤维格栅结构反射面的热变形情况,以验证格栅结构设计的合理性;其次,选择殷钢作为模具材料、M55J/氰酸脂复合材料作为反射面材料,采用热压罐成型工艺,在中温条件下分别固化内、外蒙皮与格栅板;再次,采用数控铣削加工形状各异的格栅筋板,并在筋板上开槽以实现格栅结构的拼装;最后,在常温条件下,利用重物加压的方式实现低应力胶接,并采用高精度摄影测量技术检测反射面的初始面型精度及热变形后精度。结果表明,采用有限元法模拟反射面降温70℃条件下的热变形为1.2μm;采用摄影测量检测30℃初始面型精度(RMS)为5.5μm,-40℃环境下面型精度(RMS)为7.8μm。文中所述工艺方法对制备高精度、高稳定复合材料天线反射面具有重要的指导意义。The study prepared radius of 1.2m reflector with carbon fiber composite grid structure, whose linear expansion coefficient is extremely low, was to meet the demand of high accuracy and high stability for the THz antenna. Firstly, in order to verify the rationality of the design of grid structure, finite element method was applied to calculate thermal deformation of the reflector. Secondly, Invar mould and autoclave process were used to cure the inner skin, outer skin and grid sheet made of M55J/Cyanate ester at middle temperature. Thirdly, the grid structure was assembled by the stiffened plates with slots, which were processed by CNC milling. Eventually, the reflector structure was bonded by pressing with low stress in the condition of room temperature, and photogrammetric technique was used to detect the reflector profile accuracy before and after the thermal deformation. In conclusion, the thermal deformation simulated by finite element method was 1.2μm in the condition of the temperature dropping 70℃, and the profile accuracy(RMS) of 5.5 μm and 7.8 μm for carbon fiber composite grid reflector were achieved respectively in the ambient temperature of 30℃ and -40℃. In this study, the forming process mentioned will be of guiding significance to the preparation of high accuracy and high stability composite antenna reflector.

关 键 词：碳纤维复合材料 格栅结构 热变形 成型工艺 面型精度 

分 类 号：TB332[一般工业技术—材料科学与工程]