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Compound technique capable of improving wear resistance and fatigue resistance of engine gear

A technology of fatigue performance and composite technology, which is applied in the direction of metal material coating technology, manufacturing tools, coatings, etc., to achieve the effect of improving fatigue resistance, improving wear resistance, and significant economic benefits

Inactive Publication Date: 2020-04-21
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] According to the structural characteristics of the aero-engine gear and the problem that the existing carburizing process is difficult to meet the use requirements, the present invention provides a composite process method for improving the anti-wear / fatigue performance of the engine gear. In this method, laser shock strengthening is added to the carburized layer. Further improve the wear resistance, and at the same time introduce residual compressive stress to further improve the fatigue resistance of the gear tooth surface on the basis of improving the wear resistance of the gear tooth surface

Method used

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  • Compound technique capable of improving wear resistance and fatigue resistance of engine gear
  • Compound technique capable of improving wear resistance and fatigue resistance of engine gear
  • Compound technique capable of improving wear resistance and fatigue resistance of engine gear

Examples

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Effect test

Embodiment 1

[0027] In the example of the present invention, the gear steel with the same process as the gear is used, and it is carburized+laser shock strengthening treatment. The specific implementation steps are:

[0028] Step 1: The surface of the gear steel is carburized using gas carburizing technology. During carburizing, the carburizing temperature is 915° C., the temperature is kept for 180 minutes, and the carburizing carbon potential is 1.0%.

[0029] Step 2: Quenching and tempering the gear steel treated in step 1, performing quenching process at 850°C, then cooling at -85°C for 180 minutes, and finally tempering at 160°C. It is necessary to ensure that the magnetic particle flaw detection and ultrasonic flaw detection of the material after carburizing treatment are qualified.

[0030] Step 3: Treat the gear steel treated in step 2 with figure 1 The laser shock strengthening treatment is carried out in the spot overlapping method, and the parameters of the laser shock strength...

Embodiment 2

[0032] Step 1: The surface of the gear steel is carburized by gas carburizing technology. When carburizing, the carburizing temperature is 935°C, and the temperature is kept for 120 minutes, and the carburizing carbon potential is 0.8%.

[0033] Step 2: Quenching and tempering the gear steel treated in step 1, performing quenching process at 850°C, then cooling at -65°C for 120 minutes, and finally tempering at 140°C. It is necessary to ensure that the magnetic particle flaw detection and ultrasonic flaw detection of the material after carburizing treatment are qualified.

[0034] Step 3: Treat the gear steel treated in step 2 with figure 1 The laser shock strengthening treatment is carried out in the spot overlapping method, and the parameters of the laser shock strengthening are determined according to the characteristics of the material: the laser wavelength is 1064nm, the pulse width is 20ns, and the laser energy is 3J. The spot diameter during laser shock strengthening tr...

Embodiment 3

[0036] Step 1: The surface of the gear steel is carburized using gas carburizing technology. During carburizing, the carburizing temperature is 927°C, the temperature is kept for 160 minutes, and the carburizing carbon potential is 1.0%.

[0037] Step 2: Quenching and tempering the gear steel treated in step 1, performing quenching process at 850°C, then cooling at -75°C for 150 minutes, and finally tempering at 150°C. It is necessary to ensure that the magnetic particle flaw detection and ultrasonic flaw detection of the material after carburizing treatment are qualified.

[0038] Step 3: Treat the gear steel treated in step 2 with figure 1 The laser shock strengthening treatment is carried out in the spot overlapping method, and the parameters of the laser shock strengthening are determined according to the characteristics of the material: the laser wavelength is 1064nm, the pulse width is 20ns, and the laser energy is 5J. The spot diameter during laser shock strengthening t...

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Abstract

The invention discloses a compound technique capable of improving the wear resistance and fatigue resistance of an engine gear. According to the structural form of the gear, a machining path for carburization-laser shock peening is designed, and the machining demands of different positions are met. The compound technique specifically comprises the steps of 1, adopting a gas carburization technology for conducting carburization treatment on the surface of the gear; 2, conducting quenching and tempering treatment on the gear obtained after carburization treatment in step 1; 3, conducting laser shock peening treatment on the gear obtained after quenching and tempering treatment in step 2, and determining parameters of laser shock peening such as the laser wavelength, pulse width, power density, shock frequency and shock angle according to the features of materials adopted by the gear, wherein during laser shock peening treatment, the diameter of light spots is 2.4 mm, and the overlap rateof the light spots is 50%. By means of the compound technique, the technological advantages of carburization and laser shock peening are comprehensively utilized, the surface hardness and residual compressive stress of the aeroengine transmission gear are effectively increased, thus the wear resistance and fatigue performance are improved, and the requirement of industrial application is met.

Description

technical field [0001] The invention belongs to the technical field of surface strengthening treatment, and relates to a compound process method for improving the anti-wear / fatigue performance of engine gears. Specifically, the compound process of carburizing and laser shock strengthening is adopted to improve the wear-resistant and fatigue-resistant properties of gears. Background technique [0002] Gears are the key transmission components of aero-engines, especially in turboshaft engines, they are the core components to realize torque and torque transmission. During service, the meshing surfaces of the gears are often subject to strong mutual friction, as well as complex stress states such as tension-compression alternating stress, shear stress, and severe impact dynamic stress. The problems of contact fatigue and wear are prominent, causing my country's aviation equipment Transmission gear components face problems such as short life, poor reliability, and many early failu...

Claims

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Application Information

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IPC IPC(8): C23C8/22C21D1/18C21D9/32C21D10/00
CPCC21D1/18C21D9/32C21D10/005C23C8/22
Inventor 臧顺来颜雪源罗思海何卫锋
Owner XI AN JIAOTONG UNIV
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