Method for processing composite shot blasting considering both surface peening and polishing

Abstract

The invention relates to a method for processing a composite shot blasting considering both surface peening and polishing. The method comprises the following: a first step, carrying out primary shot blasting on a material to reach saturated shot blasting intensity; carrying out secondary shot blasting based on primary shot blasting; wherein, the saturated shot blasting intensity of secondary shot blasting is about 0.6 time that of the primary shot blasting and shot blasting equipment and used shots are the same as the shot blasting equipment and used shots of the primary shot blasting. The method increases stress of residual pressure on the surface and near surface area without changing the shot blasting equipment and shots, thereby improving the microhardness of the surface and the near surface area, significantly reducing surface roughness of parts, and improving the surface quality of the shot blasting material.

Description

technical field [0001] The invention relates to a shot peening method in the technical field of surface treatment, specifically, a composite shot peening treatment method that takes both surface strengthening and polishing into account. Background technique [0002] Surface shot peening technology is a key manufacturing process to improve the fatigue life and stress corrosion resistance of mechanical parts. Shot peening factors include two aspects, namely residual stress strengthening and organizational strengthening. Tissue strengthening can effectively prevent crack initiation, while residual stress strengthening can prevent crack propagation. Controlling these two factors can change the surface properties of components. The changes of the surface layer of the material caused by shot peening include: 1) the introduction of residual compressive stress field, 2) the optimization of the deformed structure and the increase of microhardness, and 3) the change of surface rough...

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Problems solved by technology

People such as C.A.Rodopoulos in "International Journal of Fatigue (International Journal of Fatigue)" (2004, the 26th volume, 849-856 page) published " 2024-T351 aluminum alloy controlled shot-peening fatigue resistance optimization - method, result "Optimization of the fatigue resistance of 2024-T351aluminum alloys by controlled shot peening-methodology, results and analysis" paper, studied the impact of shot peening on the surface microhardness of metal materials, and found that under single shot peening conditions, shot peening There is a limit to the improvement of the microhardness of the pellet deformed layer

In the paper "Analysis of the Roughness of Pure Titanium High Energy Shot Peening Surface Nanoization" published in "China Surface Engineering" (2006, Vol. 19, pp. 43-46), Yang Lei and others studied the effect of shot peening on Influenced by the surface roughness of the material, it was found that the surface roughness increased after shot peening, although the roughness value decreased slightly with the prolongation of the shot peening time, but overall, under the condition of single shot peening treatment, the decline rate was relatively small. Small, the final surface roughness is large

In the existing shot peening process, the projectile needs to be replaced several times during the polishing process, or the polishing process is carried out on different shot blasting machines. The process operation is complicated and the equipment investment is large, so the economic benefit is poor

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