关键词: 冲压喷气发动机导弹;高温合金;超薄壁件;波纹成形;粘性介质

Abstract: The super alloy super thin wall corrugated parts(with thickness of 0 3mm)applied to missile ramjet engine,made of a lot of corrugations with smaller radius surface and non uniform height,is complicate shape component.The qualified product could not be obtained with conventional metal punch forming.In this paper,research results of Viscous Pressure Forming(VPF)of the corrugated component mentioned above are reported.VPF is a recently developed process using a highly viscous but flowable semi solid medium as soft punch.The experimental and numerical simulative methods are used to evaluate the shape,strain distribution,thickness distribution of the blank and the effect pattern of interface friction on the formability of specimens during VPF.The experimental and numerical simulation results show that VPF specimens have a lot of advantages,such as high dimensional accuracy,good surface fineness,small wall thickness reduction.Compared with simulation results with metal punch forming,the necking and wall thickness reduction on smaller radius surface can be avoided or decreased with VPF.The later has an advantage over metal punch forming as respect to super alloy super thin wall corrugated parts with smaller radius surface.

Key words: Ramjet engine missile;High temperature alloy;Super thin wall part;Corrugating;Viscous medium