Laser hardening ossifying technique of railway high speed heavy rail

A laser hardening, high-speed technology, applied in the field of laser hardening, can solve problems such as not seen, to achieve the effect of reducing material waste, reducing rail costs, and large economic benefits

Inactive Publication Date: 2008-01-23
鞍山大陆激光技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are also many scholars in China who have carried out circular spot laser quenching experiments on steel rails, but there are no reports of practical applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Use gasoline to degrease and decontaminate solvent to remove oil and rust on the surface of the rail, and then use sandpaper to polish the surface of the rail to further remove dirt, which is convenient for uniform spraying of the light-absorbing coating; then use a spray gun or brush to mix the SiO 2 The light-absorbing paint is evenly applied on the surface of the rail to improve the metal surface's resistance to CO 2 The absorption rate of the laser, the pre-coating thickness is 0.02mm; after the coating is air-dried, open the DL-HL-10000 CO 2 The laser quickly scans the surface of the rail to achieve rapid heating and cooling of the rail surface. The specific process parameters are as follows: laser power P=1.7kW, bandwidth size is length×width=30mm×1mm, lap width is 0.5mm, scanning speed V=300mm / min.

Embodiment 2

[0021] Use alcohol to degrease and decontamination solvent to remove oil and rust on the surface of the rail, and then use sandpaper to polish the surface of the rail to further remove the dirt, which is convenient for uniform spraying of the light-absorbing coating; then use a spray gun or brush to mix the SiO 2 The light-absorbing paint is evenly applied on the surface of the rail to improve the metal surface's resistance to CO 2 The absorption rate of the laser, the pre-coating thickness is 0.03mm; after the coating is air-dried, open the DL-HL-10000 CO 2 The laser quickly scans the surface of the rail to achieve rapid heating and cooling of the rail surface. The specific process parameters are as follows: laser power P=5kW, bandwidth size is length×width=30mm×1mm, lap width is 0.7mm, scanning speed V=500mm / min.

Embodiment 3

[0023] Use alcohol to degrease and decontamination solvent to remove oil and rust on the surface of the rail, and then use sandpaper to polish the surface of the rail to further remove the dirt, which is convenient for uniform spraying of the light-absorbing coating; then use a spray gun or brush to mix the SiO 2 The light-absorbing paint is evenly applied on the surface of the rail to improve the metal surface's resistance to CO 2 The absorption rate of the laser, the pre-coating thickness is 0.04mm; after the coating is air-dried, open the DL-HL-10000 CO 2 The laser quickly scans the surface of the rail to achieve rapid heating and cooling of the rail surface. The specific process parameters are as follows: laser power P=7kW, bandwidth size is length×width=30mm×1mm, lap width is 0.8mm, scanning speed V=700mm / min.

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Abstract

The invention relates to a railway high-speed heavy rail laser quenching hardening process, which comprises that: first, gasoline or alcohol decontamination solvents are used to remove the oil and rust on a steel rail surface, and the sand paper polishing on steel surface is carried out in order to evenly spray an absorbing light coating; second, an absorbing light coating SiO2 mixed with a bonding agent is uniformly coated on the steel surface with a spray gun or a brush , in order to increase the absorption rate of metal surface to CO2 Laser. The proportion between the coating and adhesivs is of 80g to 100g of SiO2 and 500ml to 600ml of alcohol and 15 ml of paint flakes. The pre-coated thickness is of 0.02mm to 0.05 mm; third, an integral-round spot is changed to a rectangular spot through a broadband integral mirror technology, and the bandwidth sizes for length and width are of 30 mm is multiplied by 1mm; fourth, a DL-HL-10000 type CO2 laser is used to fast scan the steel rail surface to realize rapid heating and cooling on the surface of the steel rail. By adoption the laser quenching strength method, the invention is capable of replacing the high-alloy material with the common railway steel rail material, thereby reducing the steel rail cost; the invention is capable of repairing the failure rail, thus reducing the material waste, and bringing greater economic benefits.

Description

technical field [0001] The invention belongs to the technical field of laser quenching, in particular to a laser quenching and hardening process for high-speed heavy rails. Background technique [0002] The railway is an important transportation facility related to the national economy and the people's livelihood. The steel rail is an important part of the railway track, which directly bears the train load and guides the wheels to run. Therefore, the quality of the steel rail is very important. During the running of the train, the inner surface of the rail is severely worn due to the dual effects of impact and friction of the wheels, especially the wear of the outer strands outside the small radius curve is particularly important. The problem of wear between the wheels and rails is exacerbated by the increased demand for heavy-haul traction on railways. The number of tracks that must be replaced each year due to wear damage is considerable. Therefore, the wear resistance o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/09
Inventor 陶兴启黄旭东于恩洪孙桂芳
Owner 鞍山大陆激光技术有限公司
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