Laser shock technology for improving gas carburizing efficiency of wind power gear

A laser shock, gas carburizing technology, applied in metal material coating process, coating, solid diffusion coating and other directions, can solve the problems of low production efficiency, long carburizing process, slow infiltration rate, etc., to improve efficiency , The effect of shortening carburizing time and dense layer

Inactive Publication Date: 2018-08-24
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, there are some shortcomings in the conventional carburizing treatment: (1) The carburizing speed is too slow, and the carburizing process takes a long time.
(2) Low production efficiency

Method used

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  • Laser shock technology for improving gas carburizing efficiency of wind power gear
  • Laser shock technology for improving gas carburizing efficiency of wind power gear
  • Laser shock technology for improving gas carburizing efficiency of wind power gear

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Process 20CrMnMo steel into M8 tooth-shaped samples;

[0022] (2) The sample is subjected to quenching and tempering treatment. First, the temperature is raised to 860°C for 15 minutes, then the sample is immediately put into oil to cool, and then the temperature is raised to 670°C for 30 minutes. Cool to room temperature after taking out;

[0023] (3) Place the sample on the YS05-C20A laser shock strengthening test platform, set the laser wavelength to 1064nm, and the spot diameter φ3mm. The width is 10ns, and the laser energy is 3J to perform laser shock on the sample;

[0024] (6) Put the sample after laser shock into the multi-purpose gas carburizing furnace, raise the temperature to 800°C, keep it warm for 2h, keep the carbon potential of 0.4% for carburizing, then raise the temperature to 910°C, keep the carbon potential of 1.15% for 5h hardening Carburizing, then reduce the carbon potential to 0.68% for 4h diffusion, then cool the furnace to 825°C, keep it ...

Embodiment 2

[0028] (1) Process 20CrMnMo steel into M8 tooth-shaped samples;

[0029] (2) The sample is subjected to quenching and tempering treatment. First, the temperature is raised to 860°C for 15 minutes, then the sample is immediately put into oil to cool, and then the temperature is raised to 670°C for 30 minutes. Cool to room temperature after taking out;

[0030] (3) Place the sample on the YS05-C20A laser shock strengthening test platform, set the laser wavelength to 1064nm, and the spot diameter φ3mm. The width is 10ns, and the laser energy is 10J to perform laser shock on the sample;

[0031] (4) Put the sample into a gas carburizing multi-purpose furnace, raise the temperature to 800°C, keep it warm for 2h, keep the carbon potential of 0.4% for carburizing, then raise the temperature to 910°C, keep the carbon potential of 1.15% for 5h strong carburizing, and then Reduce the carbon potential to 0.68% for 4h diffusion, then furnace cool to 825°C, hold for 2h and then cool down...

Embodiment 3

[0036] (1) Process 20CrMnMo steel into M8 tooth-shaped samples;

[0037] (2) The sample is subjected to quenching and tempering treatment. First, the temperature is raised to 860°C for 15 minutes, then the sample is immediately put into oil to cool, and then the temperature is raised to 670°C for 30 minutes. Cool to room temperature after taking out;

[0038] (3) Place the sample on the YS05-C20A laser shock strengthening test platform, set the laser wavelength to 1064nm, and the spot diameter φ3mm. The width is 30ns, and the laser energy is 10J to perform laser shock on the sample;

[0039] (4) Put the sample into a gas carburizing multi-purpose furnace, raise the temperature to 800°C, keep it warm for 2h, keep the carbon potential of 0.4% for carburizing, then raise the temperature to 910°C, keep the carbon potential of 1.15% for 5h strong carburizing, and then Reduce the carbon potential to 0.68% for 4h diffusion, then furnace cool to 825°C, hold for 2h and then cool down...

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Abstract

The invention relates to a laser shock technology for improving the gas carburizing efficiency of a wind power gear. The technology comprises the following steps: processing and cutting carburized steel to form a sample; hardening and tempering the sample; placing the sample on a laser shock peening test platform, and performing laser shock; and adding the sample in a gas carburizing multipurposefurnace, and successively carburizing, quenching and tempering the sample. The technology has the following advantages: the laser shock pretreatment carried out before gas carburization makes the surface of the sample deformed and strengthened in order to increase the surface roughness, increase the dislocation density in the microstructure, refine the crystal grain and form a high residual stress; and high-density dislocations and other defects in the carburizing process provide many adsorption sites and diffusion channels for carbon atoms in order to significantly increase the gas carburization efficiency, increase the thickness of the obtained carburized layer and greatly shorten the carburizing time on the basis of obtaining the same carburized layer depth, so energy is saved, and theproduction cost is reduced.

Description

technical field [0001] The invention relates to a laser shock process for improving gas carburizing efficiency of wind power gears. Background technique [0002] In the surface hardening technology of gears at home and abroad, carburizing treatment has always been the preferred process for strengthening wind power gears due to its maturity and the development of supporting technologies such as temperature control and carbon potential control. The carburizing process can make the service parts obtain the traditional manufacturing process of high hardness surface and strong toughness core. Generally, the parts that correctly complete the heat treatment process of carburizing, quenching and low temperature tempering can improve the bearing capacity and service life of the parts , Guarantee the parts after carburizing: (1) High bearing capacity and good impact resistance. (2) Strong resistance to contact bending fatigue. (3) Features such as high surface hardness and good wear...

Claims

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Application Information

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IPC IPC(8): C21D10/00C23C8/02C23C8/22
CPCC21D10/005C23C8/02C23C8/22
Inventor 胡静宋璐贾蔚菊顾晓明
Owner CHANGZHOU UNIV
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