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Gear carburizing process

A gear and carburizing technology, applied in the coating process of metal materials, manufacturing tools, coatings, etc., can solve the problems of attenuation, high austenite content, and it is difficult for key components to meet the technical requirements of mechanical properties. Effects of reduced thickness of non-martensitic layer and reduced retained austenite content

Inactive Publication Date: 2015-08-12
吴芳吉
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the existing carburizing and quenching process, direct quenching is often used 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 difficult to meet 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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Embodiment Construction

[0014] Embodiment provided by the present invention is described in further detail in conjunction with embodiment:

[0015] A gear carburizing process, comprising the steps of:

[0016] 1) Carburizing, the carburizing temperature is 800-825°C;

[0017] 2) Pre-cooling, pre-cooling the gear to 7150-740°C, and keeping it warm for 2-3 hours;

[0018] 3) Primary quenching, immerse the gear in quenching oil, keep the temperature at 100-120°C, and stir the quenching oil;

[0019] 4) Cleaning, cleaning the gears with gasoline;

[0020] 5) High-temperature tempering, heat the gear to 720-730°C, and keep it warm for 2-3 hours. High-temperature tempering should be carried out within 1 hour after the first quenching;

[0021] 6) Preheating, preheat the gear to 730-740°C and keep it warm for 2-3 hours;

[0022] 7) Secondary quenching, immerse the gear in quenching oil, keep the temperature at 125-130°C, and stir the quenching oil;

[0023] 8) Low-temperature tempering, heat the gear t...

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PUM

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Abstract

The invention discloses a gear carburizing process. The gear carburizing process comprises the following steps: (1) carburizing; (2) pre-cooling; (3) performing primary quenching; (4) cleaning; (5) performing high-temperature tempering; (6) pre-heating; (7) performing secondary quenching; and (8) performing low-temperature tempering. The gear carburizing process has the beneficial effects that the content of residual austenite and the thickness of non-martensite layer on the gear surface are reduced.

Description

technical field [0001] The invention belongs to the technical field of carburizing, in particular to a gear carburizing process. Background technique [0002] In the existing carburizing and quenching process, direct quenching is often used 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 Difficulty meeting 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 mec...

Claims

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Application Information

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IPC IPC(8): C21D1/18C21D9/32C23C8/00
Inventor 吴芳吉
Owner 吴芳吉
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