Controllable constrained laser micro shot peening intensification device and method thereof

Abstract

The invention discloses a controllable constrained laser micro shot peening intensification device and a method thereof. The device comprises a circulating water system. A deionized water curtain is adopted as a constrained layer and is provided through the circulating water system; a high-speed camera is used for observing the growth and gathering situation of bubbles in a laser micro shot peening intensification process on line; a motor is used for driving a hydraulic pump to enable deionized water to circularly flow in the whole circulation water system; the pressure and the flow rate of the deionized water in the circulating water system are controlled to take away bubbles generated near a focal point in the laser micro shot peening intensification process so as to improve laser micro shot peening efficiency. The deionized water in the circulating water system is kept in certain pressure, so that the rigidity of the deionized water curtain on the surface of a laser micro shot peening metal sample is increased, the constraining function of the deionized water curtain for plasma explosion is improved, material surface laser-induced shock wave pressure is enhanced, and an active function is performed on improving a laser micro shot peening intensification effect.

Description

technical field [0001] The invention relates to the technical field of laser processing and surface modification, in particular to a processing method and device for laser micro-shot-peening strengthening on the surface of metal materials under controllable constraints. Background technique [0002] Laser micro-shot peening is an effective method to improve the mechanical properties of the surface of metal materials by using the force effect of laser-induced shock waves, and it has potential application prospects. [0003] When laser micro-peening strengthens the surface of metal parts, the function of the confinement layer is to limit the free diffusion of the explosive plasma, so that the force effect of the shock wave can be more concentrated on the metal surface. The commonly used confinement layer is K9 glass and flowing deionized water screen. When laser micro-peening is strengthened, the plasma generated by the low-energy pulsed laser is weak, and there is a bonding ...

AI Technical Summary

Problems solved by technology

When laser micro-peening is strengthened, the plasma generated by the low-energy pulse laser is weak, and there is a bonding gap between the K9 glass and the surface of the metal material, which cannot completely seal the plasma, which seriously affects the effect of laser micro-peening

The flowing deionized water curtain can adapt to the surface of different shapes of the parts, and it is tightly attached to the surface of the parts. It is low in cost, good in light transmission, and can be recycled. There are also problems that are difficult to overcome in the ionized water curtain: (1) Because the depth of the flowing deionized water is difficult to accurately control, it affects the stability of the plasma confinement during the laser micro-peening process, so that the laser micro-peening effect is not very good control

(2) The vaporized deionized water at the laser focus forms bubbles, which cannot be quickly taken away by natural water flow, thus affecting the incidence of subsequent laser pulses, so enough time should be left between two adjacent laser pulses to Purification of the focus area seriously affects the efficiency of laser micro-peening

Images