Variable thickness composite stator blade and molding method thereof

Abstract

The invention relates to a variable thickness composite stator blade and a molding method thereof, in particular to the variable thickness stator blade integral molding technology and belongs to the technical field of advanced composites. The blade comprises a front edge plate, a variable thickness blade body and a rear edge plate which are integrally formed by the same material. The windward sideof the blade body is protected through a wear-resistant nonmetal edge wrapper. A forming mold is designed to a combined mold communicating four combined modules, and the forming mold is provided witha closed mold cavity. Tapered guiding and limiting matching surfaces are designed between the modules. Through combination of an extracted blade body neutral surface and a net volume filling method,a side line contour of laid prepreg layers conforming to the total thickness of different areas of the blade body is simulated and designed. A preform of the blade is manufactured from a continuous-filament woven fabric prepreg on four forming molds. Metal is embedded and inlaid in the corresponding position. The embedded part and the blade body are subjected to co-curing preparation through the hot pressing process. The molding method ensures that the stator blade can meet the requirements for the structural strength and stiffness and also meet the requirement for the precision of the moldedsurface of the aerodynamic configuration.

Description

technical field [0001] The invention relates to a variable-thickness composite stator vane and a molding method thereof, in particular to an integral forming technology of a variable-thickness stator vane, which belongs to the technical field of advanced composite materials. Background technique [0002] Resin-based composites have become a popular research material for aero-engine cold-end parts due to their good specific strength and specific modulus. After decades of development, resin-based composite materials have been widely used in the external casings, rotors and stator blades, containment casings, engine nacelles and thrust reversers of large bypass ratio turbofan engines and small bypass ratio afterburning turbofan engines. There are important applications in the device. [0003] More and more fiber-reinforced resin-based composites are used in the stator parts of aero-engines. For example, P&W's PW4056 / 4168 / 4084 engine fan outlet guide blades are made of pressed...

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Problems solved by technology

[0004] At present, domestic stator blades are made of metal, glass fiber reinforced plastic or low-performance carbon fiber composite materials, but the overall performance cannot meet the higher requirements of aero-engine stator blades. It is urgent to develop a lightweight, high stiffness, high strength and high surface accuracy. Stator blade

Although the above reports apply composite materials to the stator blades, they still cannot meet higher performance requirements (performance requirements such as large variable thickness, high stiffness, and high strength)

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