Composite material fan blade leading edge metal reinforcement edge two kinds of blank processing dual-purpose fixture

Abstract

The invention discloses a composite material fan blade front edge metal reinforced edge two-kind blank processing dual-purpose clamp. The clamp includes a hexahedron base. The top surface of the baseis provided with a square groove passing through the left and right side surfaces. The square groove forms a placing opening on the top surface of the base. The opening is used to place a square billet process base of a to-be-clamped reinforcing edge, or a die forging workblank process base. The front side surface of the base, close to the left side surface, is provided with a coordinate system transformation block. The front side surface of the coordinate system transformation block is a first plane. The front side surface of the base, close to the right side surface, is vertically provided with a second plane which has an included angle [phi] with the inner wall of the square groove. The first plane and the second plane are in a same plane. The position of the right side surface of the base, close to the front side surface, is vertically provided with a third plane which is vertical to the second plane. The first plane, the second plane, the third plane, and the bottom surface of thesquare groove are reference surface in die forging workblank processing. The right side surface of the base, the bottom surface of the square groove, and the inner side surface of the square groove are reference surfaces in square billet processing. The clamp fills a void in the prior art of lacking a composite material fan blade front edge metal reinforced edge square billet and die forging workblank dual-purpose clamp.

Description

[0001] 【Technical field】 [0002] The invention belongs to the technical field of mechanical processing, and in particular relates to a dual-purpose clamp for processing two kinds of rough blanks on the front edge metal reinforcement edge of a composite material fan blade. [0003] 【Background technique】 [0004] Fan blades are one of the most important components of modern commercial aircraft engines. According to statistics, the mass of the fan section accounts for about 30%-35% of the total mass of the engine. Reducing the mass of the fan section is a key means to reduce the mass of the engine and improve the efficiency of the engine. More Larger and lighter fan blades have become the development trend of aero-engines. In addition, the main thrust of a turbofan engine with a large bypass ratio comes from the cold air flowing through the outer bypass. To meet the larger bypass ratio, a fan with a larger size must be used. The use of composite material fan blades is an import...

AI Technical Summary

Problems solved by technology

Compared with traditional titanium alloy blades, resin-based composite fan blades make the engine perform better, have higher efficiency, and have better anti-flutter performance and damage tolerance, but its disadvantage lies in its ability to resist foreign object impact (such as bird strikes, hail, etc.) are weak, the intake and exhaust edges are easy to delaminate when rotating at high speed, and the erosion resistance is poor

[0005] At present, there is no in-depth research on the CNC machining of the metal reinforcement edge at the leading edge in China. The cross section of the metal reinforcement edge is V-shaped, which is divided into the solid part of the leading edge and the hollow area of ​​the blade body. It is a typical double thin-walled part.

At the same time, it also has the characteristics of ultra-long, ultra-narrow, and ultra-thin. The current sheet metal forming, 3D printing and other technological methods are not enough to process this type of parts. Therefore, at present, only one-time forming can be realized by CNC machining.

Due to the narrow space of the inner cavity and the serious distortion of the whole part, the swing range of the tool is narrow, the NC program is complicated, and the machining is difficult

Moreover, its shape and inner cavity are all composed of free-form surfaces without machining references, so special fixtures must be designed to realize the functions of clamping and fixing the blank and setting references

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