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Surface modification method of axles of high-speed trains

A high-speed EMU and surface modification technology, applied in furnace types, furnaces, heat treatment furnaces, etc., can solve the problem of inability to achieve local treatment, and achieve the effect of improving hardness, improving service life, and improving hardness and wear resistance

Inactive Publication Date: 2018-12-18
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Surface modification methods can also use surface nitriding, surface carburizing and other processes, but local treatment cannot be achieved

Method used

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  • Surface modification method of axles of high-speed trains
  • Surface modification method of axles of high-speed trains
  • Surface modification method of axles of high-speed trains

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In this embodiment, the preparation process of the axle with a quenching depth of 800 μm:

[0039] 1) The surface of the high-speed EMU axle is finished, and the surface roughness of the laser quenching part is Ra0.8; the workbench is used to clamp the variable gauge axle, and the surface is sprayed with SiO 2 Light absorbing layer, SiO 2 The composition of the light-absorbing layer is: by weight percentage, 57% of silicon dioxide, 15% of aluminum oxide, 10% of montmorillonite, 6.5% of cerium oxide, and the rest is shellac resin, which is dried and SiO 2 The thickness of the light absorbing layer was 15 μm.

[0040] 2) Adjust the angle between the laser head and the surface of the axle at 90°, set the laser output power to 1200W, the spot diameter to 4mm, the spot scanning rate to 20mm / s, the spot spacing to 2.5mm, and the spot height to 70mm to perform laser quenching on the axle surface. The argon gas is blown to the laser heating area, and the cooling rate is contr...

Embodiment 2

[0044] In this embodiment, the preparation process of the axle with a quenching depth of 350 μm:

[0045] 1) The surface of the axle of the high-speed EMU is finished, and the surface roughness Ra of the laser quenching part reaches 0.4μm; the variable gauge axle is clamped by the workbench, and the surface is sprayed with SiO 2 Light absorbing layer, SiO 2 The composition of the light-absorbing layer is: by weight percentage, 57% of silicon dioxide, 15% of aluminum oxide, 10% of montmorillonite, 6.5% of cerium oxide, and the rest is shellac resin, which is dried and SiO 2 The thickness of the light absorbing layer was 20 μm.

[0046] 2) Adjust the 90° angle between the laser head and the surface of the axle, set the laser output power to 1800W, the spot diameter to 4mm, the spot scanning rate to 50mm / s, the spot spacing to 3mm, and the spot height to 70mm, perform laser quenching on the axle surface, and argon The gas is blown to the laser heating area, and the cooling rate...

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Abstract

The invention relates to the field of production and manufacturing of axles of high-speed trains, in particular to a surface modification method of axles of high-speed trains. Through laser quenching,the surfaces of the axles are transformed into a mixed structure of granular bainites and martensites. After quenching, the depth of a surface abrasion-resistance layer can reach 100 [mu]m to 800 [mu]m, the surface Rockwell hardness can reach 70-85 HR15N, and the microhardness of an axle cross-section quenching layer can reach 390-550 HV. According to the technological parameters of laser quenching, laser quenching power is 1200 W-2500 W, the light-spot scanning rate is 20-60 mm / s, the light-spot diameter is 4 mm, light-spot spacing is 2-4 mm, and the light-spot height is 60-80 mm. Accordingto the surface modification method of the axles of the high-speed trains, laser heating is adopted, so that the surfaces of the axles of the high-speed trains are quickly enabled to reach the austenitizing temperature, and a certain cooling speed is maintained by controlling the gas flow rate; and the mixed structure of the granular bainites and the martensites is formed on the surfaces of the axles, so that a role in improving the surface hardness and abrasion resistance is played.

Description

technical field [0001] The invention relates to the field of manufacturing axles of high-speed train sets, in particular to a surface modification method for axles of high-speed train sets. Background technique [0002] The bogie is an important part of the high-speed EMU. It mainly supports the body of the EMU, bears and transmits loads and forces, and converts the rolling of the wheels along the rails into translational motion of the car body through the bearing device, and transmits traction and braking forces. effect. Among them, the wheel set is one of the parts of the bogie. It is composed of an axle and two identical wheels. The interference fit is used at the joint of the wheel and axle to make the two firmly combined. Its safety and reliability are of great importance to the entire EMU. safe operation is crucial. Although the current axle and wheels are connected by interference fit and there is no relative sliding, when the EMU runs to a certain mileage, fretting...

Claims

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Application Information

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IPC IPC(8): C21D9/28C21D1/09
CPCC21D1/09C21D9/28C21D2211/002C21D2211/008
Inventor 潘雪新姜海昌胡小锋付鸿闫德胜戎利建
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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