Material surface ultrasonic impact strengthening device and method

Abstract

The invention provides a material surface ultrasonic impact strengthening device which comprises a tensile loading module, an ultrasonic loading module, a base and a three-axis sliding table, wherein the two ends of the tensile loading module are fixed to the base, the ultrasonic loading module is connected with the three-axis sliding table and fixed to the base through the three-axis sliding table, and the ultrasonic loading module is positioned above the tensile loading module; and a test piece is fixed on a clamp of the tensile loading module. The invention further provides a material surface ultrasonic impact strengthening method. By adopting the method, the tensile loading module can drive the test piece to rotate, axial pre-tensile stress is applied to the test piece on the basis of a traditional UNSM, the residual compression stress of the test piece is further improved, and the service life of the material is prolonged; and the ultrasonic loading module performs impact strengthening on the surface of the test piece, parameters such as static load, amplitude, impact times and feeding speed can be adjusted, and roughness, hardness and residual compressive stress of the material surface can be changed, so that fatigue performance, mechanical performance and corrosion resistance of the material are improved.

Description

technical field [0001] The invention relates to a material surface modification device and method, in particular to a material surface ultrasonic impact strengthening device and method. Background technique [0002] As we all know, the application of metal materials involves many fields of life and production. The most common processing techniques for metal materials are casting, pressure processing and welding. Post-processing to meet the use and performance requirements. The first step in any product manufacturing is material selection. The most common failure forms of materials are wear, corrosion, and fracture. The failure usually originates from the surface of the material. In order to improve the strength, hardness, rigidity, wear resistance, and corrosion resistance of metal materials, Generally, it is necessary to modify and strengthen the surface of metal materials. [0003] Ultrasonic surface nanocrystalline modification (UNSM) originated in South Korea. After de...

AI Technical Summary

Problems solved by technology

Since UNSM continuously impacts the surface of the material at a frequency of 20kHz, it has a certain influence on the roughness of the material surface, but the final result is an increase or decrease of the surface roughness, which depends on the original surface roughness of the material, such as, 3D The surface roughness of printed materials decreases after UNSM, but the surface roughness of some titanium alloys increases after UNSM

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