A method for reconstructing machined surface texture through laser shock strengthening path

Abstract

The invention relates to the research on the surface texture processing method of part processing, in particular to a method for reconstructing the surface texture by controlling the laser shock strengthening path. By extracting surface texture characteristic parameters such as surface skewness and kurtosis from the surface of the inner circular hole of the test piece, and determining the material flow direction of the processed surface; based on this, the track path of laser shock strengthening is determined, and the laser shock strengthening is used to strengthen the spot. Lap and stack, so that the material flow on the strengthened surface can reverse the flow trend of the strengthened surface material; through the relationship between the calibrated laser spot overlap rate and the skewness and kurtosis of the strengthened surface, the best The overlap rate of the spot; according to the strengthening track path and the overlap rate of the spot obtained above, the laser shock strengthening is performed, and the surface texture characteristics with good fatigue resistance are reconstructed on the surface of the inner hole.

Description

technical field [0001] The invention relates to the research on the surface texture processing method of part processing, in particular to a method for reconstructing the surface texture by controlling the laser shock strengthening path. Background technique [0002] Under random cyclic loads such as vibration, mechanical components connected to each other tend to produce tiny relative motions on the order of tens of microns, and the resulting fretting damage will lead to premature nucleation of fatigue cracks. This is an important reason for fatigue fracture failure of parts in contact with each other, which will seriously reduce the service life and service safety of components. How to propose a simple and reliable surface strengthening treatment method is of great significance to the function and performance-oriented manufacturing of components. As a widely used surface strengthening method for improving the fatigue life of parts and components, laser shock peening mainl...

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Problems solved by technology

[0004] In a word, the deficiencies of the prior art disclosed in the above-mentioned documents are as follows: ①Laser shock peening is mostly used to introduce large residual compressive stress in the surface layer and sub-surface layer of the part, underestimating the role of laser shock peening in the construction of surface texture Possibility of application; ②Because the fretting fatigue cracks all start from the contact surface, the existing laser shock strengthening method ignores the influence of the strengthening process on the surface texture, and lacks a targeted proposal to achieve the construction of surface texture characteristics by controlling the laser shock strengthening path ③ There is a lack of specific functional requirements based on surface texture parameters in engineering applications, and a simple and reliable method to achieve specific surface textures through process path planning

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