摘要
小型固定翼无人机的尾撑制件为一种大长径比碳纤维复合材料薄壁类层压圆管结构,该制件除要求具有较高的内外质量、满足无人机机体结构使用要求外,其内形尺寸还应保证后续装配尺寸控制要求,因此使用传统的预浸料卷制成型方式较难以满足上述使用要求。为满足上述要求并得到一种成型工艺简便、成型质量良好的产品,利用丙烯酸酯橡胶及金属芯模制备了一种适用于预浸料成型的热膨胀芯模,并利用该芯模及组合模具通过真空袋压法实现了大长径比碳纤维复合材料薄壁类层压圆管结构制品的工艺成型。结果表明,采用丙烯酸酯橡胶作为热膨胀材料,可以良好地实现预浸料成型过程中的热膨胀加压,得到的产品不仅内、外质量良好,满足无人机机体结构使用要求外,其内形尺寸还满足了装配尺寸公差控制要求,是一种针对大长径比碳纤维复合材料薄壁类层压圆管制造较为良好的工艺成型方式。
The composite tube of small fixed wing unmanned aerial vehicle is a kind of carbon fiber composite thin-walled laminated tube structure with large aspect ratio,In addition to high internal and external quality and the requirements of unmanned aerial vehicle structure,the internal dimension shall also meet the requirements of subsequent assembly dimension control.Therefore,it is difficult to meet the above requirements by using the traditional prepreg roll forming method.In order to meet the above requirements and obtain a product with simple molding process and good molding quality,a thermal expansion core mold suitable for prepreg molding was prepared by using acrylate rubber and metal core mold,and the process molding of thin-walled laminated circular tube structure products with large length diameter ratio was realized by vacuum bag pressing method with the core mold and metal core mold.The test results show that the thermal expansion and compression of prepreg can be realized by using acrylate rubber as thermal expansion material.The product not only has good internal and external quality,but also meets the requirements of UAV body structure,and its internal dimension also meets the requirements of assembly dimension tolerance control.It is a kind of thin-wall lamination for carbon fiber composites with large aspect ratio and a good forming method for manufacturing round tube.
作者
张旭东
赵伟超
张娟
ZHANG Xudong;ZHAO Weichao;ZHANG Juan(Institute of 365,Northwestern Polytechnic University,Xi’an 710065;Xi’an Aviation Brake Technology Co.Ltd.,Xi’an 710065)
出处
《宇航材料工艺》
CAS
CSCD
北大核心
2021年第3期82-85,共4页
Aerospace Materials & Technology
关键词
环氧预浸料
中温固化
复合材料成型
圆管
Epoxy prepreg
Mid-temperature curing
Composite molding
Composite tube
