Method and apparatus for supercharging water constraint layer based on laser impact technology

Abstract

An apparatus based on laser impact technique for pressurizing the water restraining layer is composed of water cleaning unit, water flow controlling box, adjustable tap, following controller of tap, water recovering unit, pressure regulating knob and microcomputer controller. Its method includes such steps as cleaning water, controlling the speed and flow of water stream for preventing turbulent flow and ensuring high thickness uniformity of water layer and pressurizing effect, and recovering water for reuse.

Description

technical field [0001] The invention relates to the technical field of mechanical manufacturing and laser shock, in particular to a device and method for pressurizing a novel water-constrained layer in laser shock strengthening and forming. Background technique [0002] Laser Shock Processing (LSP) is a processing method with very good prospects. Its principle is that the shock wave induced by high power (Gpa level) short pulse (ns level) laser interacts with the material. This technology is mainly used in material modification, impact forming, and non-destructive testing. At present, this technology has been widely used in various industries such as mechanical manufacturing engineering, aerospace, microelectronics, and military. [0003] The confinement layer in the laser shock treatment technology refers to a layer of material transparent to the laser (good penetration to the laser wavelength) covering the surface of the impacted material, which constrains the shock wave i...

AI Technical Summary

Problems solved by technology

There are obvious defects in several constrained layer materials, and the supercharging effect of glass is remarkable. However, due to the inconvenient clamping, repeated and repeated clamping is required for large-area impacts and multiple multi-point impacts, and it cannot be used for curved surface laser shocks. The operation is cumbersome and the cleaning is complicated, so the practicability is poor; although the flexible film can solve some defects of the former, but because the constrained layer is flexible, the synergy is not as obvious as that of the rigid constrained layer, and the material selection and production of the flexible film have higher requirements, so The cost is also relatively high; when water is used as the constrained layer, the flexibility is better, and it can realize large-area impact and multiple multi-point impacts, but the pressurization effect of water as the constrained layer has been unsatisfactory in domestic and foreign experimental reports, and existing experiments The turbulence of the water flow in the device makes it impossible to accurately control the uniformity of the thickness of the water-constrained layer on the surface of the test piece, and it is easy to cause the breakdown effect of the flowing water to affect the laser shock effect.

For example, the U.S. Patent US5741559 "Laser peening process and apparatus" pointed out that the thickness of the water-constrained layer is about 0.01-20mm, but the thickness of the water-constrained layer in this patent cannot be precisely controlled, and can only be roughly estimated

Other parameter control (including water flow velocity, water flow pressure, water flow width and area) of the water-confined layer in laser shock has not been reported in the available materials at home and abroad.

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