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Laser shock wave reinforcing method and apparatus

A technology for strengthening devices and shock waves, applied in the field of laser shock wave strengthening methods and devices, can solve problems such as reducing the unfavorable factors of circular light spots, and achieve the effects of preventing expansion, reducing surface roughness, and improving utilization rate

Inactive Publication Date: 2014-01-22
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent number is 200810089032.8, and the name is a laser beam shaping five-point lens. It proposes to use a square spot to strengthen the metal surface, which greatly reduces the unfavorable factors of the circular spot. However, when the square spot is used for laser shock strengthening treatment, its overlap The area forms multiple plastic deformation zones with the same direction and runs through the entire treatment area, and fatigue cracks are easy to propagate along these areas

Method used

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  • Laser shock wave reinforcing method and apparatus
  • Laser shock wave reinforcing method and apparatus
  • Laser shock wave reinforcing method and apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In this example, the regular hexagonal overlapping method strengthens the metal surface as follows image 3 shown. The laser generator 9 is a high-energy pulse laser with a pulse width of 10 ns and a maximum pulse energy of 12 J; the absorbing layer 4 is an aluminum foil with a thickness of 80 μm; the material of the workpiece 3 is LY2 aluminum alloy; the side length of the regular hexagonal laser spot after focusing is 1.5mm.

[0021] The high-energy pulse laser emitted by the laser generator 9 passes through the shaping lens 8 and is focused by the focusing lens 7, then irradiates the absorbing layer 4 to perform laser shock strengthening on the first spot of the workpiece 3; the control system 10 controls the working table 1 Laser shock peening is done along the X and Y directions, and the overlapping distance between the spots is 0.1mm.

Embodiment 2

[0023] In this example, the laser generator 9 is a high-energy pulse laser with a pulse width of 10 ns and a maximum pulse energy of 12 J; the absorbing layer 4 is an aluminum foil with a thickness of 100 μm; the material of the workpiece 3 is A304 stainless steel; the regular hexagonal laser spot after focusing The side length is 1.5mm.

[0024] The high-energy pulse laser emitted by the laser generator 9 passes through the shaping lens 8 and is focused by the focusing lens 7, then irradiates the absorbing layer 4 to perform laser shock strengthening on the first spot of the workpiece 3; the control system 10 controls the working table 1 Laser shock peening is done along the X and Y directions, and the overlapping distance between the spots is 0.2mm.

Embodiment 3

[0026] In this example, the laser generator 9 is a high-energy pulse laser with a pulse width of 10 ns and a maximum pulse energy of 12 J; the absorbing layer 4 is an aluminum foil with a thickness of 150 μm; the material of the workpiece 3 is TC17 titanium alloy; the regular hexagonal laser beam after focusing The side length of the light spot is 1.5mm.

[0027] The high-energy pulse laser emitted by the laser generator 9 passes through the shaping lens 8 and is focused by the focusing lens 7, then irradiates the absorbing layer 4 to perform laser shock strengthening on the first spot of the workpiece 3; the control system 10 controls the working table 1 Laser shock peening is completed along the X and Y directions, and the overlapping distance between the spots is 0.5mm.

[0028]

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Abstract

The invention discloses a laser shock wave reinforcing method and an apparatus. The apparatus consists of a workbench, a clamp, a workpiece, a restraint layer, deionized water, a nozzle, a focusing mirror, a shaping lens, a laser generator and a control system; the upper surface of the shaping lens is composed of plane A, plane B, plane C, plane D, plane E, plane F and plane G which constitute six side faces and one top face of a regular hexagonal prism, wherein the top face A is parallel to the bottom face of the shaping lens; and the plane A is in the shape of a regular hexagon, and the circumcircle of the plane A has a same diameter compared with collimated laser beam emitted by the laser generator. Laser shock wave generated by an orthohexagonal laser spot is employed for reinforcing metal surfaces. The method and the apparatus helps to obtain the metal surfaces with longer fatigue life than the fatigue life of the metal surfaces treated by a circle light spot and a square light spot, and are applicable to reinforcing treatment on the metal surfaces.

Description

technical field [0001] The invention relates to the field of special processing, in particular to a laser shock wave strengthening method and device. Background technique [0002] Laser shock peening is a new material surface strengthening technology, which can obtain a high-amplitude residual compressive stress layer on the surface of metal parts, greatly improving the fatigue life of parts. Compared with conventional shot peening technology, its residual compressive stress layer is deeper. At the beginning of the 21st century, the United States applied laser shock technology to the strengthening and remanufacturing of F101, F119 and F414 engine blades. [0003] Laser shock strengthening is generally carried out with a circular laser spot. Laser shock strengthening is to strengthen the metal surface through strong shock waves. Therefore, it will cause plastic deformation on the surface. When laser shock strengthening is performed on a large area, in order to make the entire...

Claims

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Application Information

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IPC IPC(8): C21D10/00
Inventor 戴峰泽张永康温德平
Owner JIANGSU UNIV