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Production process for intelligent temperature adjusting steel rail with laser cladding layer and heat insulation coating

A technology of laser cladding and thermal insulation coating, applied in metal material coating process, coating, rail and other directions, can solve the worldwide technical problem of not effectively reducing the cost of locking the seamless circuit and reducing the temperature force of the rail , cost line safety costs remain high and other issues, to achieve the effect of increasing transportation economic benefits, avoiding line maintenance intervals, and strengthening the level of operation technology

Inactive Publication Date: 2011-08-10
张昆
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once the limited amount of expansion is close to the free expansion amount of the rail, it will have a huge destructive impact on the line
[0006] For more than one hundred years, due to people's thinking habit of locking the railway line along the rail under the change of ambient temperature, and following the temperature force calculation formula of the rail Pt=250ΔtF (wherein Pt is the temperature force, the unit is N, that is, Newton, and Δt is The degree of rail temperature change, the unit is ℃, F is the cross-sectional area of ​​the rail, the unit is cm 2 ) to strengthen railway lines, thus failing to effectively reduce the cost of locking seamless lines
And at the outdoor ambient temperature, the global technical problems of reducing the temperature force of the rail and fully industrializing it have not been effectively solved at home and abroad.
Therefore, the cost of putting on the line and the safety cost of maintaining the line remain high

Method used

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  • Production process for intelligent temperature adjusting steel rail with laser cladding layer and heat insulation coating
  • Production process for intelligent temperature adjusting steel rail with laser cladding layer and heat insulation coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1: The process of laser cladding and spraying the surface of quenched U71Mn rail

[0048] ①Mechanical (or chemical) treatment and preheating treatment of rail surface

[0049] First, use a rail grinder or a rail derusting brushing machine to remove rust on the surface of the U71Mn rail that has been quenched in its entire length. For example, use the automatic operation program of the MBC-14-L rail derusting machine to complete the derusting task: A. Complete the preparatory procedures before operation, and keep the machine in its initial state. B. The manual status button light on the operation panel is on. If there is no steel rail in the derusting machine, the input and long rail head button lights are on. C. If you press the button of the long rail head, the light of the long rail head will be on, press the automatic state button, the button light will be on, and the rail transmission selection switch and control switch will be connected. The rail to be ...

Embodiment 2

[0089] Example 2: The process of laser cladding and spraying U71Mn rail surface

[0090] The laser cladding process on the surface of the unquenched U71Mn rail was continued to be repeated in accordance with the operation steps, operation method and process parameters of the first embodiment. The only difference is that the second layer of laser cladding is sprayed with iron-based alloy powder Fe3OA and TiO 2 Composite powder of powder, its chemical mass percentage (wt%) composition is C 0.4~0.7, B 1.0~2.0, Si 2.5~3.5, Cr 12~14, Ni 28~36, Mo 4~5, TiO 2 1.0~2.0, Fe balance.

[0091] Continue to complete the slow cooling treatment, mechanical or chemical retreatment and drying treatment of the rail surface.

[0092] After the coating on the surface of the rail is dry, continue to apply radiation heat dissipation and cooling paint on the surface of the U71Mn rail. That is, one of the coating methods is still selected from the spraying method, the roller coating method, and the...

Embodiment 3

[0109] Embodiment 3 Laser cladding and spraying quenched PD 2 Rail surface technology

[0110] 1. Mechanical (or chemical) treatment and preheating treatment of the rail surface

[0111] Full-length quenched PD 2 The surface of the rail is sand blasted and derusted with a rail grinder or a rail derusting brushing machine or with a sandblasting machine. After derusting and dust removal, clean the surface of the rail so that the surface of the rail reveals a clean metallic luster (it can also be washed with chemical treatment liquid), and the surface cleaning quality reaches Sa2.5 level.

[0112] Use a rail preheater to preheat the surface of the rail, and the preheating temperature is 150-450°C.

[0113] 2. Laser cladding on rail surface

[0114] The alloy powder for cladding is prepared in advance, the particle size is -150 mesh to +300 mesh, and the particle size is mixed with micron-sized titanium dioxide, and the particle size of nano-zirconia and nano-alumina is 10-50n...

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Abstract

The invention discloses a production process for an intelligent temperature adjusting steel rail with a laser cladding layer and a heat insulation coating. The production process comprises the following steps of: (1) cladding the laser cladding of one layer or superposed inner and outer two-layer structures in thickness of 0 to 4 millimeters on the surface of the steel rail by adopting the laser cladding technology, wherein the laser cladding layer consists of mixed powder formed by mixing alloy powder and ceramic powder comprising oxide powder or / and nickel clad oxide powder in a certain ratio; (2) performing slow cooling treatment on the surface of the steel rail; (3) moderately performing surface treatment and drying treatment on the surface of the steel rail; and (4) coating a functional coating with corrosion resistance, abrasion resistance, heat insulation performance, heat dissipation and cooling performances and intelligent temperature adjustment function at normal temperatureon the surface of the steel rail. The steel rail has corrosion resistance, abrasion resistance and good electric conductivity, the cost of the steel rail can be saved, and the service life of the steel rail is long; and the steel rail can insulate heat and reduce temperature, the temperature stress of the steel rail can be greatly reduced, and the safety of train transport is improved.

Description

technical field [0001] The invention belongs to the field of metal material surface cladding and steel surface coating, and in particular relates to a steel rail surface cladding process and coating method. Background technique [0002] Since humans invented the train, along with people taking the convenient train to travel far, corresponding railway safety problems have also arisen. [0003] One of the safety problems of the railway occurs on the railway lines composed of ordinary steel rails or seamless steel rails. Although the seamless railway line is gradually replacing the ordinary line due to its advantages of high-speed running, stable operation and easy maintenance and repair, however, as the temperature along the railway line changes, the temperature of the steel rail also changes accordingly, so the steel rail will change accordingly. Corresponding thermal expansion and contraction effect. Especially in high temperature seasons and areas with large temperature d...

Claims

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Application Information

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IPC IPC(8): C23C24/10B23K26/14B23K26/34E01B5/02
Inventor 张昆
Owner 张昆
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