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Online laser quenching process for strengthening steel rail surface

A technology of laser quenching and surface treatment, applied in the direction of track, track laying, track maintenance, etc., can solve the problems of large laser volume, reduced rail toughness, unsuitable for steel rail, etc., and achieves the effect of small size, small deformation of workpiece, and convenient adjustment and control.

Inactive Publication Date: 2011-07-13
武汉武钢华工激光大型装备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] But the heavy rail laser quenching and hardening process that above-mentioned technology proposes has the following deficiencies: the first, adopt laser to carry out full surface quenching to steel rail, improve steel rail hardness, reduce the toughness of steel rail, make the main parts of turnout part (such as switch rail , guard wheel rail, basic rail, fork center) prone to cracking after quenching
Second, the device uses high-power CO 2 laser as light source, but the CO 2 The laser is bulky, has a complex structure, and is not easy to move, so it is not suitable for online laser hardening technology of steel rails

Method used

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  • Online laser quenching process for strengthening steel rail surface
  • Online laser quenching process for strengthening steel rail surface
  • Online laser quenching process for strengthening steel rail surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] First, use sandpaper to polish the surface of the rail to remove oxides and dirt such as rust on the surface of the rail, and then use alcohol to further remove the oil on the surface of the rail to facilitate the absorption of the light-absorbing coating. Then the mass fraction is 70% of graphite particles, 15% of ZnO particles and 15% of TiO 2 The particles are mixed with water to obtain a light-absorbing paint. The stone grinding particles, ZnO particles and TiO 2 Particles are submicron particles with a particle size of less than 1 micron. Then spray a layer of light-absorbing paint on the surface of the cleaned U71Mn rail with a spray gun to form a spray coating with a thickness of 0.01 mm. Finally, the semiconductor laser mounted on the trolley and capable of emitting pulsed laser is scanned along the length direction of the rail at a speed of 2 mm / s to form a grid-shaped point-like quenching zone on the surface of the rail. The pulsed laser is realized by a fa...

Embodiment 2

[0030] After polishing the surface of the rail with sandpaper to remove rust and other oxides and dirt on the surface of the rail, use alcohol to further remove the oil on the surface of the rail to facilitate the absorption of the light-absorbing coating. Graphite particles with a mass fraction of 80%, ZnO particles with a mass fraction of 10% and TiO particles with a mass fraction of 10% 2 The particles are mixed with water to obtain a light-absorbing paint. The stone grinding particles, ZnO particles and TiO 2Particles are submicron particles with a particle size of less than 1 micron. Then apply a layer of light-absorbing paint on the surface of the cleaned U75V rail with a brush to form a spray coating with a thickness of 0.01mm. Finally, the semiconductor laser mounted on the trolley and capable of emitting pulsed laser is scanned at a speed of 6mm / s along the length of the rail to form a grid-shaped point-like quenching zone on the surface of the rail. The pulsed las...

Embodiment 3

[0033] After polishing the surface of the rail with sandpaper to remove oxides and dirt such as rust on the surface of the rail, alcohol is used to further remove the oil on the surface of the rail to facilitate the absorption of the light-absorbing coating. Then the mass fraction is 75% of graphite particles, 12% of ZnO particles and 13% of TiO 2 The particles are mixed with water to obtain a light-absorbing paint. The stone grinding particles, ZnO particles and TiO 2 Particles are submicron particles with a particle size of less than 1 micron. Then spray a layer of light-absorbing paint on the surface of the cleaned U71Mn rail with a spray gun to form a spray coating with a thickness of 0.1mm. Finally, the semiconductor laser mounted on the trolley and capable of emitting pulsed laser is scanned at a speed of 10 mm / s along the length of the rail to form a grid-shaped point-like quenching zone on the surface of the rail. The pulsed laser is realized by a fan blade type opt...

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Abstract

The invention provides an online laser quenching process for strengthening a steel rail surface, comprising the following steps: coating a light absorbing coating layer on the steel rail surface; scanning the steel rail surface by a pulse semiconductor laser in the length direction at a certain speed; and obtaining laser quenching points of which the tissues arranged in a grid shape are fine martensite on the steel rail surface, wherein the area of the laser quenching points is 50-80% of the that of the steel rail surface, and the largest depth of the quenching points is 0.6-1.5 mm. In the invention, the composite phase tissue consisting of the martensite and pearlite has good toughness and ensures that the service life of a steel rail is obviously prolonged; simultaneously, the laser quenching process is conveniently adjusted, does not need a quenching medium, does not need tempering and ensures small deformation of a work piece; and the semiconductor laser is small in volume, and convenient to push, so online laser quenching treatment can be carried out on the steel rail surface.

Description

technical field [0001] The invention relates to the field of laser surface strengthening, in particular to an online laser quenching process for steel rail surface strengthening treatment. technical background [0002] Steel rail is the main component of rail transportation. The steel rail is in direct contact with the wheels of the train. The quality of the rail directly affects the safety and stability of the train. The main rail steel types of my country's railways are mainly U71Mn and U75V, both of which are ordinary carbon steel rails. With the increase of train speed, traffic volume and axle load, the damage rate of these two rails is getting faster and faster, which has exposed the problems of insufficient bearing capacity, insufficient wear resistance, and short service life, making the safety caused by rail damage Accidents occur from time to time, and the direct cost of replacing and repairing damaged rails in my country is as high as billions of yuan each year. R...

Claims

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Application Information

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IPC IPC(8): E01B31/18
Inventor 王爱华叶兵万涛熊志红
Owner 武汉武钢华工激光大型装备有限公司
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