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Method for improving mechanical surface strengthening effect

A technology of mechanical strengthening and surface structure, applied in the field of metal strengthening

Inactive Publication Date: 2016-08-24
ACADEMY OF ARMORED FORCES ENG PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a method for improving the effect of surface mechanical strengthening, to solve the technical problems in the prior art

Method used

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  • Method for improving mechanical surface strengthening effect
  • Method for improving mechanical surface strengthening effect
  • Method for improving mechanical surface strengthening effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Using compressed air or centrifugal sand blasting device, according to the hardness of the material to be strengthened and the peak-to-valley depth difference 14 of the surface structure to be prepared, select abrasives such as angular steel grit, corundum or silicon carbide, and determine the sand blasting process parameters. Carry out degreasing and deembroidery treatment on parts or structures to be treated, and shield and protect non-treated parts of parts or structures with materials such as tapes and adhesive plasters. During sandblasting, the axis of the sandblasting gun should be at an angle of 60° to 80° with the surface of the part to ensure uniform sandblasting coverage and avoid overspraying to ensure a uniform prefabricated surface structure. After sandblasting, use compressed air to dedust and remove the pretreated surface to avoid abrasive particles remaining in the surface structure. After the surface structure prefabrication is completed, the surface me...

Embodiment 2

[0060] When machining the prefabricated surface structure by turning, milling or grinding, it can be carried out on ordinary machine tools or CNC machine tools. First, select or customize the appropriate tool according to the material of the part to be strengthened, and determine the feed rate according to the peak-to-valley depth difference 14 and wavelength 15 of the surface structure to be prepared. If the surface to be treated is dirty, it should be degreased and deembroidered first. After the surface structure prefabrication is completed, the surface mechanical strengthening treatment is carried out in the shortest possible time to prevent oxidation or corrosion.

[0061] For anti-fatigue strengthening treatment, when using machining methods to prefabricate the surface structure of parallel straight corrugations or parallel curved corrugations, attention should be paid to making the longitudinal direction of the surface structure 7 consistent with the working principal st...

Embodiment 3

[0063] For the prefabricated surface structure of the hole wall of the inner hole part or the irregular local concave-convex part of the part, an electric wire brush can be used to realize it. First, select a steel wire brush (wheel) with appropriate hardness according to the material of the part to be strengthened, and the diameter of the steel wire is determined according to the peak-to-valley depth difference 14 and wavelength 15 of the surface structure to be prepared. During operation, care should be taken to ensure the uniformity of the prefabricated surface structure.

[0064] This method can prefabricate the surface structure of parallel straight corrugations and parallel curved corrugations, and can also prefabricate isotropic surface micro-scratch or surface asperity surface structure. When prefabricating a directional surface structure, attention should be paid to make the longitudinal direction 7 of the surface structure consistent with the working principal stress...

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Abstract

The invention relates to the technical field of metal strengthening, in particular to a method for improving the mechanical surface strengthening effect. According to the method, before mechanical surface strengthening treatment is conducted, a certain surface structure is machined on the surface of a treated metal material. The method for improving the mechanical surface strengthening effect includes the steps that the surface structure is machined before mechanical surface strengthening treatment is conducted, a larger and deeper residual compressive stress layer can be generated on the treated surface through mechanical surface strengthening treatment; residual compressive stress with preset directivity can be generated on the treated surface through mechanical surface strengthening treatment; the residual compressive stress value of the topmost surface is increased, so that the mechanical surface strengthening effect is further enhanced; and the treated surface layer is more likely to generate severe plastic deformation and grain refinement, and an ultra-fine grain or a nanocrystal surface layer material is prepared conveniently.

Description

technical field [0001] The invention relates to the technical field of metal strengthening, in particular to a method for improving the effect of surface mechanical strengthening. Background technique [0002] Common surface mechanical strengthening techniques, such as shot peening, rolling strengthening, cold extrusion strengthening, laser shock strengthening and ultrasonic shock strengthening, are widely used in engineering practice. These methods introduce residual compressive stress on the surface of metal materials in the form of surface plastic deformation, and at the same time cause grain refinement and work hardening on the surface of the material, and change the crystallographic texture of the surface material. Through these effects, the fatigue fracture resistance of parts can be improved. , Anti-stress corrosion performance and wear resistance. Before performing surface mechanical strengthening treatment, the surface to be treated is required to have as low a rou...

Claims

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Application Information

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IPC IPC(8): C21D7/04C21D7/06C21D10/00
CPCC21D7/04C21D7/06C21D10/00C21D10/005C21D2261/00
Inventor 朱有利王燕礼蔡佳昆侯帅许艺何嘉武
Owner ACADEMY OF ARMORED FORCES ENG PLA
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