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Laser additive repairing method for surface defects of alloy steel rail

A laser additive and repair method technology, applied in the direction of additive processing, additive manufacturing, etc., can solve the problems of prone to wear or damage, frog failure, etc., and achieve the effects of small deformation, crack prevention, and reduced heat input

Active Publication Date: 2021-05-14
北京煜鼎增材制造研究院股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Fixed frogs of railway turnouts are subjected to the impact and wear of wheel sets, and the wheel-rail force transition areas of the center rail and wing rail are prone to wear or damage locally, which will lead to the failure of frogs

Method used

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  • Laser additive repairing method for surface defects of alloy steel rail
  • Laser additive repairing method for surface defects of alloy steel rail
  • Laser additive repairing method for surface defects of alloy steel rail

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Embodiment Construction

[0032] The technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention.

[0033] The invention provides a technical proposal of a laser additive repair method suitable for surface defects of alloy steel rails, and the specifically selected alloy steel rails are fixed frog core rails.

[0034] like figure 1 As shown, the repair method in the present invention is specifically realized through the following steps:

[0035] First of all, quantitatively evaluate the damage degree of the fixed frog core rail as the basis for the judgment of the repair feasibility and the selection of the repair plan (see Figure 2). Specifically, for the single damage of the fixed frog core rail , first calculate and judge whether the ratio of the maximum depth of the area to be repaired and the theoretical thickness of the part in the direction of the maximum depth does not exceed 1 / 3; at the same...

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Abstract

The invention discloses a laser additive repairing method for surface defects of an alloy steel rail. The method is characterized by comprising the following steps of: quantitatively evaluating the damage degree of an alloy steel rail, and determining the repairability of the steel rail; for available laser additive repairing, determining a proper repairing scheme according to the damage degree; carrying out groove processing on the damaged position of the alloy steel rail or carrying out regional / integral removal on the surface of the damaged position, and carrying out groove processing after it is guaranteed that the damage is completely removed; fixing the steel rail on a machining tool and preheating the steel rail; and carrying out repairing processing by adopting a laser additive manufacturing technology. On the basis of the damage form of a fixed frog, a special laser additive manufacturing repairing method especially suitable for the fixed frog is provided from the aspects of repairing feasibility, scheme selection, pretreatment, preheating schemes, repairing process parameter selection, aftertreatment and the like, laser repairing work of the fixed frog can be well guided to be completed, and the laser additive repairing method has extremely high operability and practicability.

Description

technical field [0001] The invention relates to the technical field of laser additive manufacturing, in particular to a laser additive repair method for surface defects of alloy steel rails, especially a laser additive repair method for fixed-type frog core rails of railway turnouts. Background technique [0002] Fixed frogs of railway turnouts bear the impact and wear of wheel sets, and the wheel-rail force transition areas of the core rail and wing rail are prone to wear or damage locally, which will lead to the failure of frogs. Usually, when the frog fails, the core rail is severely damaged locally in the wheel-rail force transition area, while other parts still maintain good structure and performance. Repairing the fixed frog, especially the core rail part, can greatly extend its in-rail use Lifespan, full utilization of waste, has significant economic and social benefits. [0003] Laser additive manufacturing technology can use laser to deposit powder layer by layer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F7/08B22F10/28B22F10/31B22F12/00B22F12/10B33Y10/00B33Y30/00B33Y40/00B33Y50/02
CPCB22F7/062B22F2007/068B33Y10/00B33Y30/00B33Y40/00B33Y50/02
Inventor 钱婷婷陈博
Owner 北京煜鼎增材制造研究院股份有限公司
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