Method and device for compositely preparing surface-layer biomimetic structure by laser

Abstract

The invention relates to the field of laser processing, in particular to a method and a device for compositely preparing a surface-layer biomimetic structure by mechanical effects based on laser carving and laser shock, which are particularly suitable for processing a biomimetic surface and a friction pair surface. The method is characterized by comprising the following steps: firstly preparing a regular micro geometrical appearance with certain density (space), width, depth, angle and shape on the surface of a workpiece by the laser carving technology; and then forcedly processing the micro geometrical appearance area by laser shock to process a microstructure which has the required shape and management mode and is optimally matched with the requirement of lubricating property on the surface of the workpiece. The device for the implementation method comprises a control device, a nanosecond laser generator, a laser beam I, a light guide tube I, a totally reflecting mirror I, a light spot adjusting device I, a fiber laser, a laser beam II, a light guide tube II, a totally reflecting mirror II, a light spot adjusting device II, an automatic spraying device, a restrain layer, an absorption layer, the workpiece, a workpiece fixture system and a five-axis working platform.

Description

technical field [0001] The invention relates to the field of laser processing, in particular to a method and device for compositely preparing a surface bionic structure based on the mechanical effects of laser engraving and laser shock, and is especially suitable for processing bionic surfaces and friction pair surfaces. Background technique [0002] The organisms in nature have undergone hundreds of millions of years of evolution, and their body surface tissues have very unique structures and properties. Animals living in sticky and wet soils, such as earthworms, voles, mole crickets, crickets, dung beetles, millipedes, ants, carapaces, etc., have good functions of reducing viscosity and desorption of soil. Existing studies have shown that some soil-contacting parts of these soil animals have geometric non-smooth shapes (such as pits, convex hulls, stripes, scales, etc.), and their non-smooth shapes increase the contact of liquid on the animal body surface. It improves the...

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Problems solved by technology

However, this method is based on the thermal effect of the laser, that is, the energy of the laser beam is used to vaporize and evaporate the surface material to form pits. Due to the laser thermal effect, the structure of the surface material of the workpiece will be changed, and residual tensile stress will be formed on the surface of the workpiece, thus affecting the resistance of the material. grinding performance, so its application has certain limitations

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