Method for reducing surface remained stress of high-power pulse laser cleaned metal

A metal surface, laser cleaning technology, applied in the direction of cleaning methods and utensils, chemical instruments and methods, etc., can solve the problem that there is no research on the evolution law of the cleaning surface, and achieve the effect of reducing residual stress and achieving remarkable results

Active Publication Date: 2019-06-25
ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the current literature and patent retrieval, people have not studied the evolution of the residual stress on the surface of the laser cleaning process, how to avoid the generation of residual tensile stress during the laser cleaning process, and what technical methods are adopted to convert the residual tensile stress on the surface is the residual compressive stress, none of which have been reported

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step 1: Clean the rust layer on the surface of 45 steel with high-power short-pulse laser. The laser cleaning parameters are pulsed laser wavelength 1064nm, repetition frequency 10kHz, laser pulse width 80ns, and average power 500W. Focus the pulsed laser on the rusted surface, and scan once in S-shape reciprocatingly to obtain a clean 45 steel surface A.

[0027] Step 2: On the clean 45 steel surface A, spray about 10±2μm thick pure water, 4Wt% sodium orthosilicate and γ-glycidoxypropyltrimethoxysilane water base (mass ratio 1:1) to mix solution, 4wt% NaCl mixed solution, respectively to obtain 45 steel surface B1, B2, B3.

[0028] Step 3: Low-power laser scanning process parameters: pulsed laser wavelength 1064nm, repetition frequency 10kHz, laser pulse width 80ns, average power 50W, peak power density of pulsed laser 1.5×10 7 W / cm 2 . Using the above parameters, scan the surfaces of B1, B2, and B3 with the S-shaped path to obtain the surfaces of C1, C2, and C3, r...

Embodiment 2

[0034] Step 1: Clean the paint layer on the aluminum alloy surface with a high-power short-pulse laser. The laser cleaning parameters are pulsed laser wavelength 1064nm, repetition frequency 8kHz, laser pulse width 50ns, and average power 500W. Focus the pulsed laser on the surface of the paint layer, and scan it twice in an S-shaped reciprocating manner to obtain a clean aluminum alloy surface A.

[0035] Step 2: On the clean aluminum alloy surface A, spray about 10±2 μm thick pure water, containing 3Wt% sodium orthosilicate and γ-glycidyloxypropyltrimethoxysilane water base (mass ratio 1:2) The mixed solution and the water-based mixed solution containing 3wt% NaCl were used to obtain aluminum alloy surfaces D1, D2 and D3 respectively.

[0036] Step 3: Low-power laser scanning process parameters: pulsed laser wavelength 1064nm, repetition frequency 5kHz, laser pulse width 80ns, average power 100W, peak power density of pulsed laser 2.1×10 7 W / cm 2 . Using the above parame...

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Abstract

The invention provides a method for reducing surface remained stress of high-power pulse laser cleaned metal, and belongs to the technical field of laser cleaning. Water base mixed liquid consisting of sodium metasilicate and gamma-glycidyl oxy-propyl trimethoxy silane is firstly provided; the water base mixed liquid is sprayed to the surfaces of metal after cleaning of pollutants on the surfacesof the metal by high-power short-pulse laser; low-power laser is selected for laser scanning cleaning by an S-shaped scanning path; the average power of the laser is 50-150 W; and the peak power density of the pulse laser is 1.0*107-4.0*107 W/cm2. The method can prominently reduce the surface remained stress of the high-power short-pulse laser cleaned metal. The method has the prominent characteristics of simple and practical process, low cost and continuous operation.

Description

technical field [0001] The invention belongs to the technical field of laser cleaning application and the technical field of metal surface pretreatment, and in particular relates to a method for reducing the residual stress of high-power short-pulse laser cleaning metal surface. Background technique [0002] Surface cleaning is a regular task in manufacturing and remanufacturing, and its cleaning quality has a great impact on the performance of manufactured and remanufactured products. Especially in recent years, the demand for environmental protection has become higher and higher, and the environmental friendliness of the cleaning process has been highly regarded. Pay attention to. Laser cleaning is a green surface cleaning technology, which has the advantages of green cleaning process, high-quality cleaning surface, simple cleaning process, low cleaning cost, easy to achieve precise control, and can integrate surface cleaning and product preparation. Laser cleaning has ob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B08B7/00
Inventor 乔玉林赵海朝刘照围王思捷刘军
Owner ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY
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