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Method and device for strengthening surface modification by combination of laser cladding and laser peening

A technology of laser peening and laser cladding, which is applied in coating, metal material coating technology, etc., and can solve problems that have not yet been retrieved

Inactive Publication Date: 2009-03-25
JIANGSU UNIV
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Problems solved by technology

[0006] Research literature and related patents on surface modification of materials using laser cladding composite laser peening have not yet been retrieved

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  • Method and device for strengthening surface modification by combination of laser cladding and laser peening
  • Method and device for strengthening surface modification by combination of laser cladding and laser peening
  • Method and device for strengthening surface modification by combination of laser cladding and laser peening

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Embodiment Construction

[0028] The device of the present invention is as figure 2 , including coaxial powder feeding laser cladding unit, laser shot peening strengthening unit, measurement feedback system, numerical control working system and central control and processing system. The coaxial powder feeding laser cladding unit includes a carbon dioxide laser 12, a light guide pipe 13, a full reflection mirror 14, a spot adjustment device 10, an argon protection device 9, a powder feeder 8 and a coaxial powder feeding nozzle 7. device, the power of carbon dioxide laser 12 reaches 2.5kw, and there are two working modes: (1) gate pulse work, pulse frequency 0-2000HZ, width 10μs; (2) enhanced pulse work, pulse frequency 0-2000Hz, width 10μs, peak power It is 2-3 times that of continuous wave; laser shot peening strengthening unit includes neodymium glass laser 19, light pipe 18, total reflection mirror 17, beam conversion and adjustment device 21, pulse laser: Nd:YAG, maximum pulse energy 50J, maximum ...

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Abstract

The invention provides a method for modifying a composite surface based on laser cladding and combining laser shock peening, and a device thereof. The method provided by the invention is characterized in that a coaxial and powder feeding type fast axial flow CO2 laser cladding unit clads a layer of coating on the surface of a substrate; then a neophane glass impulse laser shock peening unit is used for the shock peening on the surface of the cladded coating; a measurement feedback system is utilized to detect the surface roughness and the distribution state of residual stress of the cladded coating; the precise control over the surface roughness and the residual stress of the coating is realized by a central control and processing system so as to obtain a high quality surface-cladded coating with good performance. The device comprises the coaxial and powder feeding type laser cladding unit, the laser shock peening unit, a digital control working system, the measurement feedback system and the central control and processing system, and is under integrated control by a computer. The method and the device of the invention can reduce residual tensile stress and improve the quality of the cladded coating and prolong the service life thereof.

Description

technical field [0001] The invention relates to the field of material surface engineering and laser technology application, in particular to a method of laser cladding a layer of high-performance material on the surface of a substrate, and then laser shot peening the cladding layer to change the residual stress distribution of the cladding layer and reduce the surface Roughness, improving its surface quality, prolonging the service life of the composite surface modification method. Background technique [0002] Coating technology is a method of coating a layer of high-performance materials on the surface of a substrate with poor performance to improve the performance of parts. Laser surface cladding technology is a new surface modification technology that emerged with the development of high-power lasers in the 1970s. It is carried out by preparing cladding coatings with high hardness, wear resistance, and corrosion resistance. Material surface modification and parts repair...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F17/00C23C24/10C21D7/06
Inventor 周建忠蒋素琴黄舒
Owner JIANGSU UNIV
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