Three-dimensional multi-directional impact surface deformation strengthening method and device

Abstract

The invention belongs to the technical field of metal material surface strengthening, and particularly relates to a three-dimensional multi-directional impact surface deformation strengthening method and device. According to the strengthening method, through hammering in the vertical direction of the surface of a metal material and outwards thrust in a tangent plane, a large residual compressive stress layer is generated on the surface of the material, generation and expansion of cracks of the material under the cyclic working load are delayed, and the fatigue life of the material is prolonged. In addition, based on the strengthening method, the invention relates to a metal material surface strengthening device for realizing the method. The device comprises a force applying body, a spring, a base, an outer hoop and the like. The hammering force causes compression deformation of the spring, so that the force applying body acts on the surface of the material to generate outwards thrust, and the outer hoop inhibits the outward movement of the force applying body so as to better act on the surface of the material. The strengthening method is realized by simultaneously applying impact force in the vertical direction and outwards thrust in the tangent plane to the strengthened material through the force applying body.

Description

technical field [0001] The invention relates to a metal material surface strengthening method and a device for realizing the method. Specifically, three-dimensional multi-directional force is applied to the strengthened metal material at the same time to obtain a better surface deformation strengthening effect than unidirectional force, which belongs to metal materials Surface strengthening technology field. Background technique [0002] Corrosion, wear, and fracture are the three major failure modes of mechanical parts, among which the loss caused by fracture failure is the largest, and fatigue failure accounts for the highest proportion of fracture failure. Usually, in order to increase the fatigue life of these parts and prolong the service life, after the parts are formed, they need to be strengthened. In practical applications, since the failure of materials mostly occurs on the surface or subsurface, surface strengthening has become a key process in the manufacturing ...

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Problems solved by technology

[0007] 2) After shot peening treatment, the residual compressive stress value on the surface of the material is small, and the strengthening effect is limited

Due to insufficient plastic deformation of the surface layer, after the shot peening force is unloaded, the residual compressive stress value on the surface of the material is small, which limits the effect of the residual compressive stress on crack suppression

The initiation, generation and propagation of material cracks mostly occur on the surface or subsurface of the material, so the small residual compressive stress on the surface of the material will cause the material to have a short fatigue life under working load and the strengthening effect is not ideal

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