Rotating beam preheating laser shock wave micro-texturing machining device and method

Abstract

The invention provides a rotating beam preheating laser shock wave micro-texturing machining device. The laser shock wave micro-texturing machining device comprises a first laser unit, a second laser unit, a composite machining head and a machining head driving mechanism. The composite machining head is of a hollow sleeve shape and is installed on the machining head driving mechanism, and the composite machining head is driven by the machining head driving mechanism to rotate around the axis of the composite machining head. The composite machining head comprises an annular cylinder wall, an upper cover plate, a lower cover plate, a double-wedge-shaped reflector, a first 45-degree reflector, a second 45-degree reflector, a reflective focusing mirror, a focusing lens and a protective mirror. Continuous laser beams are adopted for heating the peripheral region of a micro-texturing position, so that the temperature of the peripheral region of the micro-texturing position is increased, and meanwhile the micro-texturing position is also heated through heat conduction; thus, under the action of pressure of laser shock waves with the peripheral region preheating effect, a micro-texturing pit is deeper, and micro-texturing machining efficiency is easily promoted when the pulse laser beams are used for generating the shock waves. The invention further provides a rotating beam preheating laser shock wave micro-texturing machining method.

Description

technical field [0001] The invention belongs to the field of laser processing, and in particular relates to a laser shock wave micro-modeling processing device and method for preheating a rotating beam. Background technique [0002] As early as the 1960s, relevant researchers discovered that when a laser pulse irradiates the surface of a solid material, the laser interacts with the material to generate a shock wave. Subsequently, the mechanical effects of laser-induced shock waves were gradually applied to the field of engineering technology, such as laser shock strengthening treatment on the surface of materials, that is, the use of laser-induced shock waves to improve the performance of materials such as fatigue resistance, wear and stress corrosion; and laser layer cracking hair coating. The detection of the bonding strength of the layer interface is to use the characteristics of the tensile stress generated when the laser-induced shock wave is reflected at the bonding in...

AI Technical Summary

Problems solved by technology

However, the laser shock wave micro-modeling in the prior art is limited by several disadvantages. Due to the high-speed and high-pressure stamping behavior of the laser shock wave on the micro-area of ​​the modeling effect, when processing metal materials with poor plasticity, impacts occur on the edge of the micro-modeling pit. Micro-cracks or even surface rupture and splashing cause poor quality of micro-modeling and are difficult to control. At the same time, the required laser pulse energy is very high. Often, multiple pulse overlapping impacts are required to meet the requirements of micro-modeling, and the processing efficiency is not high.

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