Online testing method and apparatus for laser shock peening effect

Abstract

The invention relates to an online testing method and apparatus for a laser shock peening effect. The method is characterized in that a high power laser beam forms a plasma shock wave on a shock peening metal workpiece, sound wave signals and plasma plume image information of the shock wave are measured in real time, and the wave signals and the plasma plume image information are used as characteristic parameters for on-line assessment of laser shock peening of the metal workpiece. A laser, a laser beam, a metal workpiece, a water restraint layer, an absorption layer and a six-shaft workbench compose a laser shock unit which can realize laser shock peening of the metal workpiece. A control system controls the laser shock unit, an image processing platform and an integrated data processing system and feeds back information based on the integrated data processing system; if an electrical signal and a plasma plum image are identical with a standard signal, next pulse of laser shock is carried out, and if a great difference occurs, the integrated data processing system records the position of such a point and re-processing is carried out based on recorded situations after processing of the whole metal workpiece is finished.

Description

technical field [0001] The invention relates to the technical field of laser shock strengthening, in particular to the plasma shock wave formed by a strong laser beam on a metal workpiece for shock strengthening, and the quality evaluation of the laser shock strengthening is carried out according to the shock wave acoustic wave signal and the image information of the plasma plume. Background technique [0002] Laser shock peening (LSP: also called laser peening) is a new type of material surface strengthening technology, which has the characteristics of high pressure, high energy, ultra-fast and ultra-high strain rate, and has incomparable advantages over conventional processing methods. Technical advantages can greatly extend the service life of metal workpieces and reduce maintenance costs. [0003] The online detection of laser shock strengthening effect is very important for the engineering application of laser shock strengthening. At present, domestic scientific researc...

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Problems solved by technology

[0003] The online detection of laser shock strengthening effect is very important for the engineering application of laser shock strengthening. At present, domestic scientific research institutions mainly use piezoelectric film method and X-ray diffraction method; piezoelectric film method is to place PVDF piezoelectric film on the back of the workpiece. The shock wave force signal in the workpiece is converted into an electrical signal, and the quality of the impact is reflected through the analysis of the electrical signal. The biggest disadvantage is that the service life of the piezoelectric film method is short, and the economy is poor in actual production and application. In addition, in the same Under certain processing parameters, the measurement results are affected by the material and thickness of the workpiece; the X-ray diffraction method is an off-line measurement method, and the residual stress itself has errors, which is a destructive method, and the measured material is limited.

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