Method of manufacturing 300M ultrahigh strength steel aircraft landing gear

A technology of aircraft landing gear and ultra-high-strength steel, which is applied in the direction of improving energy efficiency and process efficiency, can solve the problems of difficult forging, complex shape, grinding, etc., reduce the amount of mechanical cutting, reduce manufacturing costs, and manufacture Effects of Cycle Advantage

Inactive Publication Date: 2008-07-30
王云阁
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the 300M integral undercarriage has a large containment area and complex shape, and the blanking weight is more than 1 ton. It requires large-diameter bars (500), which is difficult to forge and easily produces low-magnification coarse grains. At the same time, it is necessary to solve the problem of deep Grinding Technical Issues After Hole Machining and Heat Treatment
These factors ultimately lead to an exponential increase in the manufacturing cost of the landing gear
[0005] Therefore, the difficulty of forging and deep hole processing technology and high manufacturing cost of the 300M integral forging landing gear are the main problems it faces

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The 300M raw material is processed into a bar with a cross section of about 15×15mm and a length of 1000mm. According to the technical requirements of laser forming, vacuum non-contact plasma melting-argon atomization technology is used to prepare powder, which is supplied in vacuum cans in the powder atomized state. 70% of the powder is spherical powder, after sieving and drying, the particle size needs to be determined according to the parts and process, generally 100-300 mesh; using laser melting deposition equipment and technology, the parts are nearly finalized according to the three-dimensional digital model of the parts.

[0017] The composition percentage of 300M steel powder is Si1.57, Cr0.87, Mn0.67, Fe94.66, Ni1.76, Mo0.35, V0.11; using CO 2 Laser with an output power of 8500W, a spot diameter of 4mm, a focal length of 500mm, a scanning speed of 6mm / min, a powder flow rate of 18g / min, a single-layer deposition thickness of 0.5mm, and protection by argon gas pu...

Embodiment 2

[0027] Other conditions are the same as embodiment 1, adopt CO 2 Laser with an output power of 9000W, a spot diameter of 4mm, a focal length of 500mm, a scanning speed of 7mm / min, a powder flow rate of 19g / min, a single-layer deposition thickness of 0.5mm, and is protected by argon gas purging.

[0028] The tensile properties and plasticity of the 300M steel laser-formed landing gear outer cylinder and piston rod at room temperature were also tested, and the results are as follows:

[0029] Table 3 Tensile properties of 300M steel laser formed outer cylinder at room temperature

[0030] orientation

σ b (MPa)

σ 0.2 (MPa)

δ 5

ψ

vertical

Towards

1990

1675

10.2

40.0

1998

1682

9.9

42.5

1995

1680

10.0

42.0

horizontal

Towards

1980

1664

8.0

33.0

1990

1672

7.5

36.0

1984

1660

8.1 ...

Embodiment 3

[0037] Other conditions are the same as embodiment 1, adopt CO 2 Laser with output power of 10000W, spot diameter of 5mm, focal length of 500mm, scanning speed: 8mm / min, powder flow rate: 20g / min, single layer deposition thickness: 0.6mm, protected by argon gas purging.

[0038] The tensile properties and plasticity of the 300M steel laser-formed landing gear outer cylinder and piston rod at room temperature were also tested, and the results are as follows:

[0039] Table 5 Tensile properties of 300M steel laser formed outer cylinder at room temperature

[0040] orientation

σ b (MPa)

σ 0.2 (MPa)

δ 5

ψ

vertical

Towards

1992

1678

10.4

40.4

1995

1680

10.5

41.5

1997

1685

10.8

42.0

horizontal

Towards

1985

1675

8.2

32.0

1990

1682

7.9

35.0

1980

1660

8.4

33.2

[00...

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Abstract

The invention relates to a method for manufacturing a 300M ultrahigh strength steel aircraft landing gear. 300M unimach boards, steel bars or forging parts are mechanically processed into fine bars and then produced into powder; by adopting laser forming technology, according to a three-dimensional number module of parts of an outer cylinder, a piston rods, etc. of the landing gear, the 300M ultrahigh strength steel powder is melted and deposited layer by layer until is piled up as designed part blanks; finally the 300M ultrahigh strength steel whole landing gear is obtained through a routine digital control mechanical process. The invention initially utilizes laser melting deposition (laser fast forming) technology in a creative way, which realizes the manufacture of the 300M ultrahigh strength steel whole landing gear without forging process and special requirement for the specification of raw materials and greatly reduces deep-hole mechanical cutting output. The structure, the components and the properties of the parts are equal to the parts manufactured with the forging part; manufacturing difficulty is obviously reduced, manufacturing cost is reduced by 2 / 3 and manufacturing period is reduced by more than 1 / 2.

Description

technical field [0001] The invention relates to laser forming technology and ultra-high-strength steel materials, and in particular provides a manufacturing method for 300M ultra-high-strength steel aircraft landing gear. Background technique [0002] 300M steel (40CrNi2Si2MoVA) is a low-alloy ultra-high-strength steel with ultra-high strength, excellent transverse plasticity, fracture toughness, fatigue resistance and stress corrosion resistance. It is the preferred material for modern aircraft landing gear structures. Since welding is not recommended for 300M steel, integral parts are mostly used. Its raw materials mainly include rods, plates, wires, pipes, forgings, etc. [0003] The 300M steel integral landing gear can avoid the process defects and material defects that may be caused by welding, which is beneficial to improve the fatigue life of the landing gear. [0004] However, the 300M integral undercarriage has a large containment area and complex shape, and the b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105
CPCY02P10/25
Inventor 王云阁王向明王华明
Owner 王云阁
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