A laser additive repair method for 300m steel aircraft landing gear

A technology of aircraft landing gear and laser additive material, which is applied in the direction of additive processing, furnace, heat treatment equipment, etc., can solve the problems of difficult to achieve repair effect, complex structure of landing gear, high repair accuracy requirements, etc., to reduce residual stress and prevent cracking , Improve the effect of surface quality

Active Publication Date: 2021-10-01
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

The structure of the landing gear is complex, the repair is difficult, and the repair accuracy is high. It is difficult to achieve the ideal repair effect by using traditional welding repair technology

Method used

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  • A laser additive repair method for 300m steel aircraft landing gear
  • A laser additive repair method for 300m steel aircraft landing gear
  • A laser additive repair method for 300m steel aircraft landing gear

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Embodiment Construction

[0028] 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.

[0029] In this embodiment, the substrate to be repaired is a 300m steel landing gear, and the specific laser additive repair process is specifically included as follows:

[0030] Slope processing

[0031] There is a need to process the groove in the damage area before the laser add material repair. In the existing repair process, the general grooves are processed in which the heart axis is perpendicular to the landing gear structure (that is, the central axis of the groove is coincident with the normal surface of the landing gear). However, in the case of the actual injury, the cracked expansion direction is not necessarily perpendicular to the surface of the landing gear. At this time, if it still uses the traditional vertical slope processing, it will lead to excessive groove area, and the repair area has...

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PUM

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Abstract

The invention discloses a laser additive repair method for 300M steel aircraft landing gear, comprising: 1) groove processing; 2) laser additive repair; 3) local stress relief annealing treatment; 4) post-processing. The invention adopts a special groove design and a specific laser scanning method, which can reduce the residual stress to the greatest extent. The invention innovatively develops local heat treatment equipment, which can perform local heat treatment on the repaired area, further remove residual stress, and at the same time ensure that the heat input to other parts of the landing gear is small. And the self-improved and designed secondary hardening stainless steel powder is used as the repair material to obtain excellent repair tissue performance. In addition, the laser processing equipment and heat treatment equipment of the present invention are small in size and light in weight, and can directly repair the landing gear of the aircraft at the service airport to achieve rapid response.

Description

Technical field [0001] The present invention relates to the technical field of aerospace equipment manufacturing, in particular, relating to a 300m steel aircraft settlement laser additive repair method. Background technique [0002] The landing gear is an accessory device that supports the aircraft and used for ground moving at the lower part of the aircraft. 300M steel is a low-alloy ultra-high strength steel, due to the low cost, high strength, high strength, plasticity, anti-fatigue performance and impact resistance, etc., the main committee Material. During the takeoff and landing, the ground should have a large impact force and bump vibration on the aircraft, and the landing gear is affected by a large impact load, which is easy to produce cracks. The role of stress corrosion will accelerate the production and expansion of cracks when serving in the marine environment and in corrosive environments. Cracks will greatly weaken the landing resistance to impact load, seriously ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F7/08B22F10/28B22F10/64B22F10/366B22F10/85C22C38/02C22C38/42C22C38/44C22C38/46C22C38/48C22C38/52C21D1/30C21D6/00C21D9/00C21D11/00B33Y10/00B33Y40/20B33Y50/02
CPCB22F3/24B22F7/062B22F2003/248B22F2007/068B33Y10/00B33Y50/02B33Y40/20C21D1/30C21D6/004C21D6/007C21D6/008C21D9/0068C21D11/00C21D2211/004C21D2211/008C22C38/02C22C38/42C22C38/44C22C38/46C22C38/48C22C38/52
Inventor 不公告发明人
Owner 北京煜鼎增材制造研究院股份有限公司
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