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Pre-oxidation technology for improving wind power gear gas carburizing efficiency

A gas carburizing and pre-oxidation technology, which is applied in the coating process of metal materials, manufacturing tools, coatings, etc., can solve the problems of high labor intensity, long process cycle, and high energy consumption

Inactive Publication Date: 2018-09-28
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, 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 the maturity of the technology and the development of supporting technologies such as temperature control and carbon potential control. However, conventional gas Carburizing has problems such as long process cycle, high energy consumption, and high labor intensity, which seriously affects production efficiency

Method used

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  • Pre-oxidation technology for improving wind power gear gas carburizing efficiency
  • Pre-oxidation technology for improving wind power gear gas carburizing efficiency
  • Pre-oxidation technology for improving wind power gear gas carburizing efficiency

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Process 20CrMnMo steel into M12 tooth-shaped samples;

[0022] (2) Refining and tempering the sample, first raising the temperature to 840°C for 30 minutes, then putting the sample in oil to cool immediately, then raising the temperature to 680°C for 30 minutes, taking it out and air cooling to room temperature.

[0023] (3) Place the sample in a program-controlled box-type electric furnace for pre-oxidation treatment, set the furnace temperature to 350°C, and hold the temperature for 45 minutes;

[0024] (4) Put the pre-oxidized sample 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 920°C, keep the carbon potential of 1.2% for 4h Intense carburizing, then reduce the carbon potential to 0.68% for 4h diffusion, then cool the furnace to 820°C, hold for 2h and then cool down with the furnace; then take out the sample and put it in oil to...

Embodiment 2

[0029] (1) Process 20CrMnMo steel into M12 tooth-shaped samples;

[0030] (2) Refining and tempering the sample, first raising the temperature to 840°C for 30 minutes, then putting the sample in oil to cool immediately, then raising the temperature to 680°C for 30 minutes, taking it out and air cooling to room temperature.

[0031] (3) Place the sample in a program-controlled box-type electric furnace for pre-oxidation treatment, set the furnace temperature to 350°C, and hold the temperature for 60 minutes;

[0032] (4) Put the pre-oxidized sample 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 920°C, keep the carbon potential of 1.2% for 4h Intense carburizing, then reduce the carbon potential to 0.68% for 4h diffusion, then cool the furnace to 820°C, hold for 2h and then cool down with the furnace; then take out the sample and put it in oil to...

Embodiment 3

[0037] (1) Process 20CrMnMo steel into M12 tooth-shaped samples;

[0038] (2) Refining and tempering the sample, first raising the temperature to 840°C for 30 minutes, then putting the sample in oil to cool immediately, then raising the temperature to 680°C for 30 minutes, taking it out and air cooling to room temperature;

[0039] (3) Place the sample in a program-controlled box-type electric furnace for pre-oxidation treatment, set the furnace temperature to 500°C, and hold the temperature for 45 minutes;

[0040] (4) Put the pre-oxidized sample 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 920°C, keep the carbon potential of 1.2% for 4h Intense carburizing, then reduce the carbon potential to 0.68% for 4h diffusion, then cool the furnace to 820°C, hold for 2h and then cool down with the furnace; then take out the sample and put it in oil to...

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Abstract

The invention relates to a pre-oxidation technology for improving wind power gear gas carburizing efficiency. The pre-oxidation technology includes the following steps that carburizing steel is slicedinto a gear-shaped sample; the sample is subjected to thermal refining; the sample is subjected to ultrasonic cleaning and drying after grinding; the sample is placed in a program control box type electric stove and is subjected to the pre-oxidation treatment; and the sample is placed into a gas carburizing multipurpose stove, and is subjected to carburizing, quenching and tempering treatment. The pre-oxidation technology has the beneficial effects that the pre-oxidation treatment is carried out before the gas carburizing, an oxidation film layer is formed on the sample surface, wettability of the sample surface is increased and the pre-oxidation treatment is beneficial for absorbing activated carbon atoms; the oxidation film is preferentially restored during the process of gas carburizing, through the defect of existing a plurality of holes on the sample surface, permeating of the activated carbon atoms into the base body, and a quick channel is provided for diffusing the carbon atoms; and gas carburizing efficiency is greatly improved, carburizing time is greatly shortened in the condition of reaching the same layer depth of the carburizing and the energy is saved.

Description

technical field [0001] The invention relates to a pre-oxidation process for improving gas carburizing efficiency of wind power gears. Background technique [0002] Wind power gears are the key components of wind power generators. Because wind power generators are generally placed in wilderness, field, mountain pass, seaside and other places with high wind energy and no shelter around, the natural environment is harsh, transportation is inconvenient, and repair is very difficult. Wind power gears Once a failure occurs, it will seriously affect the economic benefits of the wind farm, so high requirements are placed on the reliability and working life of the gear. [0003] At present, 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 the maturity of the technology and the development of supporting technologies such as temperature control and carbon potential cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/32C23C8/22C23C8/02C23C8/10C21D1/25C21D6/00
CPCC21D9/32C21D1/25C21D6/00C23C8/02C23C8/10C23C8/22
Inventor 胡静宋璐
Owner CHANGZHOU UNIV
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