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意大利开发新型复合材料用于3D打印直升机模型

中国机械工业联合会机经网  发布时间:2019-06-05 15:27:39  来源:国际金属加工网


风洞试验是航空动力学家长久以来用于直接测量飞机设计中的受力、力矩、压力以及可视化气流情况的技术。航空公司通常会为风洞测试设计和制造特别的小尺寸飞机模型,然而这一工作可能并不轻松。意大利Leonardo SpA(原Finmeccanica)公司过去曾用木材、金属及传统复合材料制作模型,然而使用传统材料和工艺制作模型需要花费大量时间和精力,特别是当工程师想要在风洞测试期间对设计进行更改时。

  风洞试验是航空动力学家长久以来用于直接测量飞机设计中的受力、力矩、压力以及可视化气流情况的技术。航空公司通常会为风洞测试设计和制造特别的小尺寸飞机模型,然而这一工作可能并不轻松。意大利Leonardo SpA(原Finmeccanica)公司过去曾用木材、金属及传统复合材料制作模型,然而使用传统材料和工艺制作模型需要花费大量时间和精力,特别是当工程师想要在风洞测试期间对设计进行更改时。

未标题-1.jpg

  Leonardo直升机业务部(原AgustaWestland)需要一台 1:8.5 比例的AW609 倾转旋翼机的全新模型,用于在公司自有风洞实验室和位于Politecnical di Milano的工厂进行标准飞行姿态下的一系列专用低速飞行测试 。此外,工程师希望能够自由、快速地改变模型的外部几何形状,以了解其空气动力学性能。为实现这一目标,Leonardo与意大利Metaltech Srl公司合作,并使用了意大利CRP Technology公司商标为Windform的3D打印材料。

根据Leonardo公司的CAD设计文件,Metaltech公司用铝合金和钢材构造出一个内部结构骨架。CRP Technology公司采用 Windform XT 2.0 碳纤维增强聚酰胺复合材料,利用选区激光烧结工艺(SLS)3D打印模型的机身和机头组件、整流罩、机舱和旋转器、尾翼、机翼和襟副翼,以便与金属骨架匹配。Windform XT 2.0 复合材料可满足Leonardo公司对快速生产、高刚?#21462;?#39640;断裂伸长率、良好的尺寸公差和细节重现的要求。在预期负载条件下的结构强度测试中,Windform材料展示出了足够的抗风载挠?#21462;?/p>

CRP Technology公司表示,由于部分零部件的设计尺寸超出了3D打印机的构造范围,因此必须分段制造。在CAD文件基础?#24076;?#20998;段零部件根据风洞隧道条件和部件可能在其中承受的压力进行设计, 无需增加生产时长和成本。3D打印工序在四天内完成,零部件经防水、喷漆处理后交付至 Metaltech公司,装配到金属骨架结构上。

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