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A method and device for laser-induced double cavitation

A laser-induced and cavitation technology, applied in the laser field, can solve the problems of difficult to thoroughly study laser-induced cavitation technology, complex interaction between laser and liquid medium, etc., to achieve good processing effect, good thermal conductivity, and strong shock wave intensity. Effect

Active Publication Date: 2018-02-27
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Laser-induced cavitation techniques are difficult to thoroughly study due to the complexity of the laser-liquid medium interaction

Method used

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  • A method and device for laser-induced double cavitation
  • A method and device for laser-induced double cavitation
  • A method and device for laser-induced double cavitation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The laser for processing is λ=1064nm, the pulse width is 10ns, and the laser repetition frequency is 1Hz.

[0050] Titanium alloy is selected as the material to be processed, and the liquid medium is water medium.

[0051] Place the glass container on the three-dimensional mobile platform and fix it. Place the material to be processed horizontally in a glass container and fix it. The H value is adjusted through the three-dimensional moving platform, and H=10mm is taken as the experimental experience value of double cavitation. Use a measuring cup to slowly inject the liquid medium into the glass container to avoid cavitation inside the liquid. The liquid level is at the top of the glass container, so that the water medium fills the entire glass container.

[0052] The beam expander focusing system was adjusted, and the breakdown threshold J of the water medium was measured experimentally 0 = 68mJ, the laser breakdown threshold of titanium alloy is 55mJ, according to ...

Embodiment 2

[0055] The laser energy value is 80mJ, which is slightly greater than the threshold value of laser breakdown in the water medium. Considering the loss of laser transmission in the device and the liquid medium, other parameter settings and devices are exactly the same as those in the embodiment, and the single cavitation pulsation sequence in the liquid medium is detected. Figure such as Figure 7 . At this time, the laser energy can only penetrate the liquid medium. When the laser beam is transmitted to the surface of the material to be processed, considering the absorption of the liquid medium 7 and the breakdown threshold of the surface of the material to be processed, no cavitation can be generated on the surface of the material to be processed. , forming single vacuoles.

Embodiment 3

[0057] Adjust the H value through the three-dimensional mobile platform, and take H=0mm. The laser energy is set to 60mJ, and other parameters are the same as in Example 1. The single cavitation pulsation sequence at the surface of the material to be processed is detected such as Figure 8 . At this time, the laser focus point is on the surface of the material to be processed, and the energy is large and exceeds the breakdown threshold of the surface of the material to be processed. The energy of other points is small and not enough to break down the liquid medium, so only cavitation is formed on the surface of the material to be processed. Because of the blocking effect of the surface of the material to be processed, the formed cavitation is semicircular rather than circular.

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Abstract

The invention discloses a method and a device using laser to induce double cavitations. The method and the device using the laser to induce the double cavitations have the advantages that when liquid medium is radiated by a laser beam, the cavitations are simultaneously produced on the laser focusing part and the surface of to-be-processed material, so that the cavitation inducing strong shock wave in the liquid medium and the strong shock wave produced by the cavitation inducing at the surface of the to-be-processed material are overlapped, repeated, or simultaneously acted on the surface of the to-be-processed material; the surface intensity of the material is improved; the impact pressure is high, the oxidizing degree of material is low, and the like; the application prospect is wide.

Description

technical field [0001] The invention belongs to the field of laser technology, and in particular relates to a method and a device for laser-induced double cavitation. Background technique [0002] Laser-induced cavitation processing technology uses the shock wave generated by cavitation pulsation and collapse to act on the surface of the workpiece. Compared with laser processing technology in air, it has the characteristics of low material oxidation degree and small thermal effect. At present, laser-induced cavitation technology mainly includes laser-induced cavitation in liquid medium for processing and laser focusing on the surface of the material to be processed in the liquid medium for processing. The former has the advantages of good controllability, precise position positioning and high impact pressure; the latter has the advantages of good processing effect and high efficiency through the liquid medium to constrain the surface plasma expansion. [0003] Due to the co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/146B23K26/36
CPCB23K26/146B23K26/36
Inventor 佟艳群黄建宇吴笑漪任旭东袁寿其叶云霞杨宁张昂周武超
Owner JIANGSU UNIV
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