Anti-fatigue controlled laser shot peening method and device therefor

Abstract

The invention relates to a method and a device for intensifying controlled laser shot peening, first of all, a fatigue analysis model is established in a fatigue analysis software, distribution of residual stress in the accessories is optimized in light of the expectant fatigue life value after the intensification to obtain the distribution of residual stress which meets the demand; the distribution of residual stress is imported into a structural mechanics CAE analysis software to obtain by optimization laser shock wave pressure acting on the surface of a sheet metal and the shot peening track; after than a computer control system automatically selects the pulse parameter and a light beam changing device while the laser shot peening; the laser emits a high energy short pulse laser beam to be converted into the high amplitude shock wave pressure acting on the surface of the accessories after being subjected to an optical changing device and an optical mask; a measurement feedback system is used to online check the distribution situation of the stress and strain on the surface layer of the accessories in the laser shot peening, the special computer software module is utilized to perform error analysis and parameter correction, ensuring to generate the expectant distribution of residual stress on the surface layer of the accessories to meet the intensification demand of the anti-fatigue performance.

Description

technical field [0001] The invention relates to the technical field of mechanical manufacturing and laser application, in particular to a method and a device for determining the corresponding residual stress distribution according to the fatigue resistance strengthening requirements of parts, and determining the laser shot peening process parameters according to the residual stress distribution. Background technique [0002] The rapid development of science and technology has put forward higher and higher requirements for the precision, performance and life of precision mechanical parts, and its use environment has become more and more harsh. Many mechanical structures must be subjected to high pressure, high temperature, high wear and high corrosion. use under external conditions. Various cracks and defects will inevitably appear during the processing of parts, and stress concentration areas will also emerge as the times require, resulting in damage or failure of parts. Th...

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Problems solved by technology

[0005] Research literature and related patents on controlled laser shot peening for anti-fatigue manufacturing have not yet been retrieved

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