A method of laser shock treatment to obtain a stable water film in the whole leaf disk

Abstract

The invention provides a method for acquiring a stable water film in laser shock processing of a blisk. According to the invention, in the process of laser shock processing, the position of a nozzle remains unchanged, a laser spot is guaranteed to be unchanged by using a six-degree-of-freedom mechanical arm, a current sprayed by the nozzle is maintained at a contact position of a blade, an included angle between the current and a tangent plane of a contact remains unchanged, so it is guaranteed that the stable water film is obtained at the position of the laser spot; and a to-be-processed blade area is divided into two parts for separate processing so as to guarantee that the stable water film is obtained in the whole process of laser shock processing.

Description

technical field [0001] The present invention relates to the technical field of laser shock strengthening, and specifically refers to a method for obtaining a stable water film in a laser shock treatment of an integral blisk. Background technique [0002] Laser shock peening is a new type of material surface strengthening technology, which can obtain a high-amplitude residual compressive stress layer on the surface of metal parts, greatly improving the fatigue life of the part. Compared with conventional shot peening technology, its residual compressive stress layer is deeper; At the beginning of the 21st century, the United States applied laser shock technology to the strengthening and remanufacturing of F101, F119 and F414 engine blades. [0003] The integral blisk can greatly simplify the structure of the aero-engine, reduce the weight of the compressor by 30%, increase the thrust-to-weight ratio of the engine, and improve the starting efficiency. service life; however, t...

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Problems solved by technology

[0003] The integral blisk can greatly simplify the structure of the aero-engine, reduce the weight of the compressor by 30%, increase the thrust-to-weight ratio of the engine, and improve the starting efficiency. service life; however, the fatigue fracture of the blade edge of the blisk restricts its service life. Laser shock treatment of the edge of the blisk can greatly improve the fatigue life of the blade, thereby improving the service life of the blisk. Very thin and easy to deform, in the process of laser shock treatment of blades, a stable water film is very important for the stability of the laser shock effect

[0004] The blades of the overall blisk have a high density and a large twist angle, so they cannot be disassembled and processed separately. During the laser shock treatment, it is often necessary to manually adjust the position of the nozzle. In this way, the shape of the water film has a great difference in each adjustment. Randomness affects the consistency of the treatment process and greatly reduces the treatment efficiency; the domestic invention patent ZL200510094810.9 "Method and device for pressurizing a new water-constrained layer based on laser shock technology" proposes to use an accompanying controller to control the water nozzle The linkage with the laser spot realizes the real-time control of the water confinement layer, and is applied to the laser shock treatment of engine blades; in the actual laser shock treatment, a telephoto lens is required, and its focal length generally exceeds 1 meter. To deal with the blisk in this way will lead to extremely complex control system and optical path system; therefore, in the laser shock treatment of the blisk, the position of the laser spot and the position of the water nozzle are fixed, and the multi-degree-of-freedom is generally realized by manipulators. The movement of the blisk as a whole, so as to complete the laser shock treatment, which requires a suitable process to obtain a stable water film

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