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作 者:刘聪乐 任军学[1] 张雅莉 史恺宁[1] LIU Congle;REN Junxue;ZHANG Yali;SHI Kaining(Key Laboratory of High Performance Manufacturing for Aero Engine,Ministry of Industry and Information Technology,Northwestern Polytechnical University,Xi’an 710072,China)
机构地区:[1]西北工业大学航空发动机高性能制造工业和信息化部重点实验室,西安710072
出 处:《航空制造技术》2024年第4期123-131,共9页Aeronautical Manufacturing Technology
基 金:国家科技重大专项(J2019-Ⅶ-0001-0141);国家自然科学基金(51905442)。
摘 要:碳纤维增强复合材料(Carbon fiber reinforced plastic,CFRP)因其优良的力学性能,被广泛应用于航空航天领域。CFRP的应用在保证飞机刚度强度的前提下,有效地提高了飞行性能,减轻了飞机重量,从而达到了节能减排的目的,提高了航空工业的经济效益。CFRP属于典型的难加工材料,为了保证结构件在多个方向具有一定的承载能力,航空发动机工业中一般采用CFRP多向铺层,这就使得材料的各向异性及不均匀性更为复杂。本文对CFRP单向层合板和两种CFRP多向层合板的铣削加工断裂机制进行了分析,发现CFRP铣削加工时,不同的纤维方向角对断裂机制有较大的影响从而导致了不同的表面质量。其中,弯曲断裂会导致表面质量急剧下降,应尽量避免,并且不同角度下的弯曲断裂的表面质量也具有一定差异。基于此,提出了多向CFRP铣削加工时的刀具切入角度优化方法,并通过试验验证了该方法的合理性,该方法可以有效提高某型号发动机的第一级复合材料风扇叶片的加工质量。CFRP(carbon fiber reinforced plastic)is widely used in aerospace field because of its excellent mechanical properties.Under the premise of ensuring the stiffness and strength of the aircraft,the application of CFRP can effectively improve the flight performance and reduce the weight of the aircraft,so as to achieve the purpose of energy saving and emission reduction,and improve the economic benefits of the aviation industry.CFRP is a typical difficultto-machining material,and in order to ensure that the structure has load-bearing capacity in different directions,CFRP multidirectional lamination is generally used in the aero-engine industry,which makes the anisotropy and inhomogeneity of the material more complex.In this paper,the milling fracture mechanism of CFRP unidirectional laminates and two kinds of CFRP multidirectional laminates is analyzed,and it is found that different fiber direction angles have great influence on the fracture mechanism during CFRP milling,resulting in different surface quality.Among them,bending fracture will lead to a sharp decline in surface quality,which should be avoided as far as possible,and the surface quality of bending fracture at different angles is also different.Based on this,an optimization method of tool cut-in angle in multidirectional CFRP milling is proposed,and the rationality of this method is verified by experiments.This method can effectively improve the machining quality of the first-stage composite fan blade of a certain engine.
关 键 词:多向CFRP 铣削加工 刀具切入角度优化 三维粗糙度 各向异性
分 类 号:V262[航空宇航科学与技术—航空宇航制造工程]
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