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A device and method for surface modification of laser-induced cavitation bubbles

A surface modification, laser-induced technology, applied in the field of surface modification devices, to achieve the effects of easy control, elimination of processing defects, and high efficiency

Inactive Publication Date: 2017-12-05
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the relevant research literature and patents on the use of laser-induced cavitation bubbles to strengthen life-extending substrates have not yet been retrieved.

Method used

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  • A device and method for surface modification of laser-induced cavitation bubbles

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Embodiment 1

[0025] The base material is selected as an iron sheet with a thickness of 1mm, and the surface of the iron sheet is decontaminated with alcohol or acetone, and the treated iron sheet is placed on the five-axis linkage workbench together with the pad and the water tank A; adjust the YAG laser process Parameters, the laser energy is 21mJ, the output wavelength is 1.06μm, the pulse width is 30ns, and the spot diameter is 1mm; at the same time, adjust the output power of the water pump to keep the water pressure at the water inlet at 0.05MPa, and the water in the pressure water chamber passes through the laser After the action, cavitation bubbles are generated, and the cavitation bubbles containing high-energy gas act on the surface of the iron sheet along with the water column. Adjust the five-axis linkage worktable to completely treat the surface of the iron sheet, and then dry and clean the iron sheet. It has been determined that the residual compressive stress is between 260 MP...

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Abstract

The invention relates to a device and a method for surface modification by inducing cavitation bubbles with laser. The device comprises a water tank A and a five-shaft linked worktable, wherein the water tank A is positioned on the five-shaft linked worktable; a cushion block is arranged in the water tank A; a base body is arranged on the cushion block; a water pumping chamber is mounted at the upper part of the water tank A; a water outlet in the lower end of the water pumping chamber is aligned to the water tank A; a light transmitting hole is formed in the upper end of the water pumping chamber and is connected with a laser system; the water pumping chamber is also provided with a water inlet; and the water inlet is sequentially connected with a water pump and a water tank B. According to the device and the method disclosed by the invention, a high-strength force effect generated during bursting of the cavitation bubbles is used for generating high-amplitude residual compressive stress on the surface of the base body so that fretting-fatigue resistance of the surface of the base body is effectively improved, the mechanical properties of the base body are comprehensively improved, and the aims of strengthening the surface of the base body and prolonging the service life of the base body are realized.

Description

technical field [0001] The invention relates to a surface modification device and method for inducing cavitation bubbles in water by applying laser light. Background technique [0002] In the liquid, when the laser power density exceeds the breakdown threshold of the liquid, the liquid medium is broken down, and a luminous plasma cavity is formed in the breakdown area. The plasma continues to absorb laser energy strongly, and the cavity expands rapidly to form a cavity. The pulsation of bubbles radiates pulsed sound waves into the liquid. This process is the phenomenon of "photocavitation". The photocavitation effect caused by the interaction between laser and liquid medium is a basic theoretical problem in the fields of laser medicine and underwater laser processing. [0003] Theoretical research on the cavitation problem can be traced back to the spherical symmetric cavitation equation proposed by Rayleigh in 1917. From this equation, the transient distribution of the pres...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D10/00
Inventor 任旭东随赛佟艳群袁寿其刘厚林王勇左成亚吴坤卢加兴王德顺
Owner JIANGSU UNIV
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