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Gear carburization quenching technology

A technology of carburizing and quenching and gears, which is applied in the manufacture of tools, heat treatment equipment, furnaces, etc., can solve the problems of attenuation, high austenite content, and difficulty in meeting the technical requirements of key components with mechanical performance requirements, and achieve non-Martensitic Effect of reduced body layer thickness and reduced austenite content

Inactive Publication Date: 2014-03-19
常熟市东风齿轮厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002]The existing carburizing and quenching process is often used to directly quench after carburizing and pre-cooling, but the amount of residual austenite in the carburized layer after quenching is relatively high, especially for essentially coarse Grain steel, the surface is easy to form reticular carbide, and the surface hardness is difficult to meet the technical requirements
Another carburizing and quenching process is one-time quenching after carburizing and cold air. The performance has been improved, but it is still difficult to meet the technical requirements for key parts with high mechanical performance requirements.
For this reason, the teeth are usually ground after carburizing and quenching, but the grinding of the teeth will convert the compressive stress into tensile stress, which is not good for the mechanical properties of the workpiece; its mechanical properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A gear carburizing and quenching process, comprising the steps of:

[0020] 1) Carburizing, the carburizing temperature is 840°C;

[0021] 2) Pre-cooling, pre-cooling the gear to 740°C and keeping it warm for 3 hours;

[0022] 3) Primary quenching, immerse the gear in quenching oil, keep the temperature at 120°C, and stir the quenching oil;

[0023] 4) Cleaning, cleaning the gears with gasoline;

[0024] 5) High-temperature tempering, heat the gear to 730°C and keep it warm for 3 hours, and high-temperature tempering should be carried out within 1 hour after the first quenching;

[0025] 6) Preheating, preheat the gear to 740°C and keep it warm for 3 hours;

[0026] 7) Secondary quenching, immerse the gear in quenching oil, keep the temperature at 130°C, and stir the quenching oil;

[0027] 8) Cleaning, cleaning the gears with gasoline;

[0028] 9) For low temperature tempering, heat the gear to 170°C and keep it warm for 3 hours. High temperature tempering should ...

Embodiment 2

[0030] A gear carburizing and quenching process, comprising the steps of:

[0031] 1) Carburizing, the carburizing temperature is 830°C;

[0032] 2) Pre-cooling, pre-cooling the gear to 730°C, and keeping it warm for 2 hours;

[0033] 3) For primary quenching, immerse the gear in quenching oil, keep the temperature at 110°C, and stir the quenching oil;

[0034] 4) Cleaning, cleaning the gears with gasoline;

[0035] 5) High temperature tempering, heat the gear to 720°C and keep it warm for 2 hours, high temperature tempering is carried out within 1 hour after the first quenching;

[0036] 6) Preheating, preheat the gear to 730°C and keep it warm for 2 hours;

[0037] 7) Secondary quenching, immerse the gear in quenching oil, keep the temperature at 125°C, and stir the quenching oil;

[0038] 8) Cleaning, cleaning the gears with gasoline;

[0039] 9) Low-temperature tempering, heat the gear to 160°C and keep it warm for 2 hours, and high-temperature tempering should be car...

Embodiment 3

[0041] A gear carburizing and quenching process, comprising the steps of:

[0042] 1) Carburizing, the carburizing temperature is 833°C;

[0043] 2) Pre-cooling, pre-cooling the gear to 736°C, and keeping it warm for 2.5 hours;

[0044] 3) For primary quenching, immerse the gear in quenching oil, keep the temperature at 118°C, and stir the quenching oil;

[0045] 4) Cleaning, cleaning the gears with gasoline;

[0046] 5) High-temperature tempering, heat the gear to 725°C and keep it warm for 2.5 hours, and high-temperature tempering should be carried out within 1 hour after the first quenching;

[0047] 6) Preheating, preheat the gear to 737°C and keep it warm for 2.5 hours;

[0048] 7) Secondary quenching, immerse the gear in quenching oil, keep the temperature at 127°C, and stir the quenching oil;

[0049] 8) Cleaning, cleaning the gears with gasoline;

[0050] 9) For low temperature tempering, heat the gear to 162°C and keep it warm for 2.5 hours. High temperature temp...

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Abstract

A disclosed gear carburization quenching technology comprises the following steps: 1) carburizing with a temperature of 830-840 DEG C; 2) performing pre-cooling on a gear to 730-740 DEG C and keeping the temperature for 2-3 h; 3) performing primary quenching, immersing the gear into quenching oil, keeping the temperature at 110-120 DEG C, and stirring the quenching oil; 4) cleaning the gear with gasoline; 5) performing high tempering, heating the gear to 720-730 DEG C, keeping the temperature for 2-3 h, performing high tempering within 1 hour after primary quenching; 6) performing preheating on the gear to 730-740 DEG C, and keeping the temperature for 2-3 h; 7) performing secondary quenching, immersing the gear into quenching oil, keeping the temperature at 125-130 DEG C, and stirring the quenching oil; 8) cleaning the gear with gasoline; and 9) performing low tempering, heating the gear to 160-170 DEG C, keeping the temperature for 2-3 h, and performing low tempering within 1 hour of the secondary quenching. The provided gear carburization quenching technology helps to reduce the residual austenite content and the non-martensite layer thickness on the gear surface.

Description

technical field [0001] The invention relates to a gear carburizing and quenching process. Background technique [0002] The existing carburizing and quenching process is usually followed by direct quenching after carburizing and pre-cooling, but the amount of residual austenite in the carburized layer after quenching is relatively high, especially for essentially coarse-grained steel, the surface is easy to form network carbides, and the surface hardness is difficult. meet technical requirements. Another carburizing and quenching process is one-time quenching after carburizing and cold air, and the performance has been improved, but it is still difficult to meet the technical requirements for key parts with high mechanical performance requirements. For this reason, the teeth are usually ground after carburizing and quenching, but the grinding of the teeth will convert the compressive stress into tensile stress, which is not good for the mechanical properties of the workpiec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F17/00C21D1/18C21D9/32
Inventor 万小华
Owner 常熟市东风齿轮厂
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