A high-efficiency micro-texture manufacturing method based on laser shock wave coupling effect

Abstract

The invention belongs to the field of laser micromachining, in particular to a method for manufacturing highly efficient microtextures based on the coupling effect of laser shock waves. The shaping mirror is placed between the laser generator and the focusing lens. The axis of the high-energy pulse laser emitted by the high-energy pulse laser generator coincides with the axis of the shaping lens and the focusing lens. And the bottom is covered on the surface of the workpiece; the metal contact film and the surface of the workpiece to be processed are closely attached to the surface to process regular hexagonal or square micro-grooves, and the spot shape of the high-energy pulse laser emitted by the high-energy pulse laser generator is passed through the shaping lens. Designed as a regular hexagon or square; the high-energy pulsed laser passes through the constrained layer, interacts with the absorbing layer to generate a plasma explosion and forms a high-voltage shock wave, and at the same time, the edge of the laser beam spot is closely attached to the metal contact film and the surface of the workpiece to be processed. The micro-grooves are coupled with each other to realize the manufacture of the micro-texture on the surface of the workpiece to be processed.

Description

technical field [0001] The invention belongs to the field of laser micromachining, in particular to a method for manufacturing highly efficient microtextures based on the coupling effect of laser shock waves. Background technique [0002] The surface structure of traditional mechanical parts is formed naturally, passively, and randomly. In an ideal state, there must be an optimal surface structure that matches the performance of the mechanical system. The use of high-energy laser beams can be used to process preset micro-textures on the surface of mechanical parts, so as to obtain surface topography that is conducive to fatigue performance. [0003] At present, the methods for machining micro-texture topography on the surface of metal materials mainly include: mechanical method, electrochemical etching method, electric discharge machining, and electrolytic machining. The mechanical method has defects such as complex tool manufacturing and low processing efficiency. Electro...

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Problems solved by technology

[0004] Chinese patent CN1358603A "A method of laser processing the micro-convex shape of the spherical crown on the surface of the roll", by accurately controlling the blowing direction and pressure of the external auxiliary gas and the laser pulse width, part of the metal material is gasified and flew out, forming a recoil pressure And the material in the center of the molten pool is blown to the edge of the molten pool to form a textured morphology, but if the laser pulse width is not properly controlled, the gasification effect is not obvious, which is not conducive to the formation of an ideal micro-textured morphology

Chinese patent CN104308361A "A device and method for manufacturing surface micro-protrusion morphology by laser shock", but this method depends on the extrusion effect of the secondary shock wave formed by the thermal expansion of the viscous glue on the center material of the micro-melt pool, so it cannot be effectively controlled The size and height of each micro-protrusion cannot produce a micro-texture with a specific geometric shape

The shortcomings of the above methods are that the distribution of the processed micro-topography is random, and it is impossible to realize active design and control.

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