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Railway vehicle axle repair process

A technology for railway vehicles and axles, applied in metal material coating process, coating and other directions, can solve problems such as environmental hazards of abandoned axles, high axle replacement costs, wheel seat cracks and unloading grooves, etc., to achieve environmental friendliness and eliminate residual stress. , the effect of reducing the harm to the environment

Inactive Publication Date: 2015-04-01
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it can be seen from the inspection of the axles in the factory that a considerable part of the axles have been damaged within less than 10 years of use, and the defects are mainly wheel seat cracks and unloading groove cracks.
[0004] At present, there is little research on the repair technology of damaged railway vehicle axles, and there are still crack defects in the actual repair of axles, many of which are directly replaced by axles, the cost of direct axle replacement is high, and abandoned axles are harmful to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: A repairing process for railway vehicle axles, which includes the following steps:

[0022] (1) Pre-treatment: Machining the damaged part of the axle to remove the defects of the damaged part, and then use acetone and absolute alcohol to remove the oil and rust within 20mm of the damaged part and the surrounding area;

[0023] (2) Laser cladding: After step (1), the surface of the damaged part of the axle is scanned by a semiconductor laser with lateral powder feeding along the damaged part, and the surface of the damaged part of the axle is melted to form a molten pool, and the metal powder is flowed 15L / min of argon gas is blown into the molten pool to melt and repair the damaged parts of the axle. The metal powder is composed of the following mass percentages:

[0024] 0.1% carbon, 17.5% chromium,

[0025] 10.5% nickel, 0.12% silicon,

[0026] The rest is iron,

[0027] The parameters of the laser cladding process are as follows:

[0028] Laser power 2000W, scanning ...

Embodiment 2

[0033] Example 2: A repairing process for railway vehicle axles, which includes the following steps:

[0034] (1) Pre-treatment: Machining and hand-grinding the damaged part of the axle at the same time to remove the defects of the damaged part, and then use acetone and absolute alcohol to remove the oil and rust within 20mm of the damaged part and the surrounding area;

[0035] (2) Laser cladding: After step (1), the surface of the damaged part of the axle is scanned with a coaxial powder-feeding fiber laser along the damaged part, and the surface of the damaged part of the axle is melted to form a molten pool, and the metal powder is flowed 15L / min of argon gas is blown into the molten pool to melt and repair the damaged parts of the axle. The metal powder is composed of the following mass percentages:

[0036] Carbon 0.25%, chromium 17.5%,

[0037] Nickel 16%, boron 0.65%,

[0038] 1% silicon, the rest is iron,

[0039] The parameters of the laser cladding process are as follows:

[...

Embodiment 3

[0045] Example 3: A repairing process for railway vehicle axles, which includes the following steps:

[0046] (1) Pretreatment: Manually polish the damaged part of the axle to remove the defects of the damaged part, and then use acetone and absolute alcohol to remove the oil and rust within 20mm of the damaged part and the surrounding area;

[0047] (2) Laser cladding: After step (1), the surface of the damaged part of the axle is scanned by a semiconductor laser with lateral powder feeding along the damaged part, and the surface of the damaged part of the axle is melted to form a molten pool, and the metal powder is flowed 11L / min argon gas is blown into the molten pool to melt and repair the damaged parts of the axle. The metal powder is composed of the following mass percentages:

[0048] 0.1% carbon, 28% chromium,

[0049] Nickel 10.5%, boron 0.65%,

[0050] Silicon 0.12%, Molybdenum 4.5%,

[0051] The rest is iron,

[0052] The parameters of the laser cladding process are as follow...

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Abstract

The invention discloses a railway vehicle axle repair process. The process comprises the steps of pretreatment, laser cladding, residual stress relaxation and machining, wherein in the laser cladding step, the adopted metal powder comprises, by mass, 0.1-0.25% of carbon, 17.5-28% of chromium, 10.5-16% of nickel, 0-0.65% of boron, 0.12-1.0% silicon, 0-4.5% of molybdenum, 0-0.8% of manganese and the balance being iron. A vehicle axle repaired through the process is small in microstructure, free of the defects such as air holes, slag inclusion and cracks and capable of meeting the requirement for use performance; the service life of the repaired vehicle axle reaches or exceeds that of a new axle. The railway vehicle axle repair process has the advantages that operation is easy, the controllability is good, the damaged vehicle axle can be repaired quickly in a short time, the cost for replacement of the damaged axle with the new axle is lowered, the use cost of the vehicle axle is lowered, harm of the discarded vehicle axle to the environment is reduced, and environmental friendliness is achieved.

Description

technical field [0001] The invention relates to a laser cladding repair technology, in particular to a repair technology of a railway vehicle axle. Background technique [0002] The axle is an important part related to transportation safety. Once the axle breaks and causes derailment and rollover, the loss will be heavy. According to railway standards, the service life of the axle is 25 years. However, it can be seen from the inspection of the axles in the factory that a considerable part of the axles have been damaged within less than 10 years of use, and the defects are mainly wheel seat cracks and unloading groove cracks. For axles with cracks in the wheel seat and wheelsets that need to be removed, there are generally different degrees of strain on the surface of the axle after the wheels are removed. In addition, there are also a large number of scrapped axles during the production process, most of which are caused by the following reasons: dimensional deviation cause...

Claims

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Application Information

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IPC IPC(8): C23C24/10C22C38/40C22C38/44C22C38/54C22C30/00
Inventor 陈辉陈文静刘艳余敏李远星
Owner SOUTHWEST JIAOTONG UNIV
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