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Composite stepped carburizing and quenching technology of gear shaft

A carburizing and quenching, gear shaft technology, applied in the field of heat treatment, can solve the problems of not meeting the ideal requirements, high wear resistance, hardness and fatigue strength requirements, etc., to reduce heat treatment deformation, increase diffusion speed, and reduce heating speed Effect

Inactive Publication Date: 2017-06-13
ZHANGQIU HAILI MACHINERY MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The gear shaft has high requirements on the wear resistance, hardness and fatigue strength of the parts, and the general quenching process cannot meet the ideal requirements

Method used

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  • Composite stepped carburizing and quenching technology of gear shaft
  • Composite stepped carburizing and quenching technology of gear shaft
  • Composite stepped carburizing and quenching technology of gear shaft

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The same batch of gear shafts in Table 1 were heat treated by the conventional carburizing and quenching process and the above-mentioned compound step carburizing and quenching process respectively. The comparison results are shown in the following table. Table 2 is the conventional process, and Table 3 is the compound step carburizing and quenching process:

[0033]

[0034] Table 2: Conventional carburizing and quenching process

[0035]

[0036] Table 3: Composite step carburizing and quenching process

Embodiment 2

[0038] The same batch of gear shafts in Table 1 were heat treated by the conventional carburizing and quenching process and the above-mentioned compound step carburizing and quenching process respectively. The comparison results are shown in the following table. Table 4 is the conventional process, and Table 5 is the compound step carburizing and quenching process

[0039]

[0040] Table 4: Conventional carburizing and quenching process

[0041]

[0042] Table 5: Composite step carburizing and quenching process

[0043] According to the data comparison of the same batch of gear shafts before heat treatment in Example 1 and Example 2 after heat treatment by conventional carburizing process and composite step carburizing process, it can be seen that after heat treatment by conventional carburizing process, the helical error of the gear is relatively small. Large, the precision of the helix is ​​greatly reduced, and after heat treatment using the composite step carburizing ...

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Abstract

The invention belongs to the technical field of heat treatment, in particular to a composite stepped carburizing and quenching technology of a gear shaft. The composite stepped carburizing and quenching technology of the gear shaft includes the steps of entering furnace and heating, preserving heat, reheating, preserving heat of the stepped carburizing and quenching, reducing temperature and preserving heat, outing furnace and quenching, and the like. By adoption the composite stepped carburizing and quenching technology of the gear shaft, a constant temperature is firstly applied at a temperature below the critical point of the transformation before the workpiece is carburized, the temperature of the workpiece tends to be uniform inside and outside the temperature, thus, the internal and external temperature difference, the heating speed, and the thermal stress are reduced; and in carburizing stage, the stepped carburizing is adopted, that is, increase of cyclation and decrease of carbon concentration gradient, thus, the diffusion rate of carbon atoms is increased, the holding time of workpieces at high temperature is reduced, the deformation of heat treatment is reduced, and the requirements of metallurgical structure and mechanical properties are met.

Description

technical field [0001] The invention belongs to the technical field of heat treatment, and in particular relates to a gear shaft composite step carburizing and quenching process. Background technique [0002] Carburizing and quenching is a common heat treatment process for metal materials. It can make the surface of the carburized workpiece obtain high hardness and improve its wear resistance. Traditional processes mainly include: low temperature tempering, pre-cooling direct quenching, primary heating quenching, carburizing high temperature tempering, secondary quenching cold treatment, induction heating after carburizing and other processes. The quenching process is widely used in the modern machinery manufacturing industry. The important parts in the machinery, especially the steel parts used in automobiles, aircraft and rockets, are almost all quenched. In order to meet the technical requirements of various parts, various quenching processes have been developed. craft. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/00C21D9/32
CPCC21D9/32C23C8/00
Inventor 王培中郑学科
Owner ZHANGQIU HAILI MACHINERY MFG CO LTD
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