Intra-light water delivery laser shock peening method and device

A technology of laser shock strengthening and water delivery, which is applied in laser welding equipment, welding equipment, metal processing, etc., can solve the problems of turbulence in the water-constrained layer, easy formation of voids, and influence on the stability of the water-constrained layer in the processing area. Synchronization, conducive to uniform distribution, and reduce the effect of "stress hole" effect

Inactive Publication Date: 2015-03-11
JIANGSU UNIV
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  • Abstract
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Problems solved by technology

The disadvantage of this method is that in order to avoid turbulence in the processing area, there is a certain distance between the water spraying point and the processing area, so the synchronization between the water spraying action and the laser impact action during the workpiece movement cannot be guaranteed, which will affect the water constraint in the processing area. layer stability
In addition, the surface morphology and surface quality of the workpiece have a great influence on the water-confined layer in the processing area. When the surface of the workpiece is a curved surface, gaps are easily formed between the curved surface of the convex surface and the water-confined layer, so that the incident laser beam ablates the surface of the workpiece, resulting in processing damage. , a thicker water film is formed on the concave part of the curved surface, which affects the effect of laser shock strengthening; even when the surface of the workpiece is flat, the water confinement layer in the processing area will appear turbulent due to the difference in surface quality in different areas

Method used

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  • Intra-light water delivery laser shock peening method and device
  • Intra-light water delivery laser shock peening method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A device for laser shock strengthening of water in the light, such as figure 1 As shown, it includes: laser 1, laser control device 2, optical path converter 4, fixture 13, five-axis workbench 14, main water pipe 5, nozzle 9, water inlet pipe 10, water flow controller 12 and water tank 11; wherein the structure of nozzle 9 is Such as figure 2 As shown, it includes: connecting thread 15, water inlet 16, tapered water outlet 17, connecting rod 18.

[0028] The fixture 13 is installed on the five-axis table 14; the laser 1 is located opposite to the five-axis table 14; the laser control device 2 is connected to the laser 1 to control the output pulse energy, spot diameter and pulse width of the laser; the optical path converter 4 is located on the laser Between 1 and the five-axis workbench 14, it is used to transform the circular laser beam 3 into a hollow laser beam 6; the main water pipe 5 is installed on the optical path changer 4; the nozzle 9 is connected with the ...

Embodiment 2

[0030] The specific steps to implement the laser shock strengthening of water delivery in the light are as follows:

[0031] (1) Turn on the laser 1, set the output pulse energy of the laser 1 to 6 J, the spot diameter to 3 mm, and the pulse width to 20 ns through the laser control device 2;

[0032] (2) The circular laser beam 3 is converted into a hollow laser beam 6 by the optical path converter 2, and the hollow laser beam 6 is required to be coaxial with the main water pipe 5 and not to interfere with the main water pipe 5. The inner diameter of the hollow laser beam 6 is consistent with the nozzle The outer diameters of 9 are equal, both are 4 mm;

[0033] (3) Turn off the laser 1, coat the surface of the workpiece 7 with the absorbing layer 8 and install it on the fixture 13 of the five-axis worktable 14, and then select the nozzle outlet width D is 1mm, L is 1.2 mm, according to the formula Move the workpiece 7 through the five-axis worktable 14, so that the dista...

Embodiment 3

[0037] The shower nozzle outlet width in embodiment two DIt is set to 1.5 mm, the pressure of the water flow is set to 0.2 MPa, the apex angle of the conical surface is 170°, and other methods and steps remain unchanged.

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Abstract

The invention discloses an intra-light water delivery laser shock peening method and a device. A spray head which is arranged in a hollow laser beam formed after light path transformation of a circular laser beam and at the bottom of a main water pipe coaxial with the hollow laser beam sprays water to a to-be-processed area of a workpiece in the whole circumferential direction to form a stable water restraint layer with uniform thickness, so that the uniform distribution of residual compressive stress on the surface of the workpiece is better ensured. The water restraint layer formed by the method is not influenced by the surface appearance and surface quality of the workpiece, and the method is suitable for processing the curved workpiece, such as a blade. In addition, the adopted hollow laser beam also facilitates significantly reducing a stress hole effect on the surface layer of the workpiece.

Description

technical field [0001] The invention relates to the field of laser processing, in particular to a laser shock strengthening method and a device for realizing the method, which are suitable for processing curved surface workpieces, such as blades and the like. Background technique [0002] Laser shock peening (LSP), also known as laser peening, is a new type of surface strengthening technology for materials. It uses strong laser-induced shock wave mechanics to process materials. It has the characteristics of high pressure, high energy, ultra-fast and ultra-high strain rate. The residual compressive stress layer formed by it can effectively eliminate the stress concentration inside the material and inhibit the initiation and expansion of cracks, and can significantly improve the fatigue life, corrosion resistance and wear resistance of metal parts. [0003] In order to achieve the mechanical strengthening effect of laser shock wave, a constrained layer must be used in the lase...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/146B23P25/00
Inventor 罗开玉景祥罗密林通鲁金忠
Owner JIANGSU UNIV
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