A bubble observation and elimination device and method for laser underwater processing

Abstract

The invention discloses a bubble observation and elimination device and method for laser underwater processing, belonging to the technical field of laser underwater processing in special processing, comprising an ultra-short pulse laser underwater processing unit, a three-directional observation unit and a liquid flow circulation unit, jet assist unit, dry air purge unit, ultrasonic vibration unit, and multi-energy field control unit that processes bubble images, regulates liquid flow circulation unit, jet assist unit, dry air purge unit, ultrasonic Vibration unit parameters to achieve the optimal state of bubble elimination to adapt to ultrafast laser underwater micromachining of various materials and different laser processing parameters. The invention accurately observes the laser underwater processing bubbles, utilizes the multi-energy field coupling effect of the flow field-sound field to efficiently eliminate the bubbles, and realizes the ultra-short pulse laser-induced plasma micromachining with high precision and low damage.

Description

technical field [0001] The invention belongs to the technical field of laser underwater processing in special processing, and more particularly relates to a bubble observation and elimination device and method for laser underwater processing. Background technique [0002] In the aerospace field, ultra-high temperature ceramic composite materials are commonly used materials for the manufacture of hypersonic aircraft parts. They have high strength, high temperature resistance, and high thermal conductivity, and have broad application prospects. However, ultra-high temperature ceramic composite materials have high hardness and brittleness. Traditional processing methods are difficult to process. [0003] Ultra-short pulse laser underwater processing is focused into the liquid medium by picosecond or femtosecond laser to induce high-temperature plasma, and the thermal and mechanical energy of the plasma is used to perform micro-processing on the surface of the material. Due to i...

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Problems solved by technology

[0004] Ultrashort pulse laser underwater processing can be used to process ultra-high temperature ceramic composite materials. However, due to the high temperature plasma, the liquid medium or molten material in the processing area will rapidly heat up and vaporize, resulting in a large number of bubbles.

The movement of the bubbles along the direction of the laser light path will cause the laser to defocus, resulting in unstable processing and uneven width and depth of the processed microstructure. At the same time, dynamic behaviors such as expansion, contraction, and rupture of the bubbles near the processing area will cause changes in the flow field. And accompanied by strong shock waves acting on the processed surface, increasing the surface roughness and significantly reducing the quality of the surface

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