A Shot Peening Process for Surface Strengthening of Nuts

Abstract

The present invention relates to the field of shot peening technology for surface strengthening of nuts, specifically a shot peening process for surface strengthening of nuts. The specific steps are as follows: S1: design and determine process parameters according to parts requirements; S2: dry gradient shot peening; S3: Detect the residual stress on the surface of the nut; S4: Wet shot peening; S5: Detect the surface roughness of the nut; S6: Perform water shot peening on the nut to further polish the surface of the nut; S7: After the water shot peening process is completed, the shot peening on the surface of the nut The strengthening process is completed; S8: Detect the residual stress and surface roughness of different sections on the surface of the nut, and design a dry-wet mixing multi-step multi-gradient shot peening strengthening method according to the straight section, small arc, and large arc of the geometric structure of the nut. The advantages of dry and wet shot peening, the residual stress of different sections of the nut is more uniform than dry shot peening, and the shot peening efficiency is high; the surface is bright, wet shot peening and water shot peening polish the surface of the workpiece, and the surface roughness is low; Improve the service life of the workpiece.

Description

technical field [0001] The invention relates to the field of shot peening technology for nut surface strengthening, in particular to a shot peening technology for nut surface strengthening. Background technique [0002] Shot peening is a high-speed concentrated injection of tiny projectiles onto the surface of metal components, causing micro-compression plastic deformation on the surface, thereby forming a protective layer of residual compressive stress on the surface of the component, thereby improving the tensile performance of the component and improving the fatigue strength. Shot peening technology is mainly used for anti-fatigue strengthening of load-bearing parts such as gears and bearings. Because of simple equipment, low cost, and convenient operation, it is widely used in automotive, mechanical equipment, and aerospace parts. For the surface strengthening of nuts of different sizes, the operation area is divided into sections based on the geometric shape, and the gr...

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Problems solved by technology

[0003] The dry shot peening process can produce a better anti-fatigue stress layer with high efficiency, but the surface is uneven and poor in roughness; the wet shot peening process can make the surface evenly temperature and smooth, but the anti-fatigue stress layer is shallow and the anti-fatigue performance is weak ,low efficiency

It is difficult to achieve the desired effect in terms of stress protection layer and roughness at the same time by only one shot peening method

[0004] For example, Chinese Patent No. 201510030403.5 discloses a method that can achieve multiple shot peening of different specifications and types of projectiles in one clamping and a method of mixing one shot peening with various specifications and models of projectiles in a patent document of a mixed shot peening method. Dry shot peening is adopted, although the work efficiency of dry shot peening and the strength of parts are improved, but there are still common problems of dry shot peening, and the surface roughness is difficult to control

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