Thermal treatment process of 20CrMnTi-steel passive helical gear shaft of differential gear

A technology for gear shafts and differentials, which is applied in the field of heat treatment of differential 20CrMnTi steel passive helical gear shafts, can solve the problems that the strength, hardness and toughness cannot meet the requirements of use, achieve high organizational order, and reduce quenching The effect of cracks and fine grains

Inactive Publication Date: 2018-11-23
HUBEI WEINENGDA TRANSMISSION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many parts are subjected to torsional loads during work, and these torsioned parts are often subjected to alternating torques, and the strength, hardness and toughness of these parts are often not up to the use requirements

Method used

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  • Thermal treatment process of 20CrMnTi-steel passive helical gear shaft of differential gear
  • Thermal treatment process of 20CrMnTi-steel passive helical gear shaft of differential gear

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A heat treatment process for a differential 20CrMnTi steel passive helical gear shaft, the chemical element composition and mass percentage of the 20CrMnTi steel passive helical gear shaft are: C: 0.18%, Si: 0.25%, Mn: 0.5%, Cr: 1.2 %, Ti: 0.02%, P<0.04%, S<0.04%, the balance is iron, and the heat treatment process includes the following steps:

[0023] S1: Carburizing: Use the method of heating to high temperature. After the gas carburizing furnace is heated to 900-920°C, put the passive helical gear shaft vertically into the furnace, exhaust, keep warm for 2.5 hours, and drop 160-180 drops of kerosene during the heat preservation / min, the temperature of the infiltrated layer will drop to 820±10℃ after meeting the requirements;

[0024] S2: heat preservation: heat preservation and soaking for 2 hours;

[0025] S3: two-stage quenching: immerse the passive helical gear shaft vertically in the calcium chloride solution at a temperature between 810 and 830 degrees Celsiu...

Embodiment 2

[0031] A heat treatment process for a differential 20CrMnTi steel passive helical gear shaft, the chemical element composition and mass percentage of the 20CrMnTi steel passive helical gear shaft are: C: 0.22%, Si: 0.3%, Mn: 0.9%, Cr: 2.0 %, Ti: 0.08%, P<0.04%, S<0.04%, the balance is iron, and the heat treatment process includes the following steps:

[0032] S1: Carburizing: Use the method of heating to high temperature. After the gas carburizing furnace is heated to 900-920 ° C, put the passive helical gear shaft vertically into the furnace, exhaust, keep warm for 2.5 hours, and drop 160-180 kerosene during the heat preservation Drops / min, the temperature of the infiltration layer will drop to 820±10℃ after meeting the requirements;

[0033] S2: heat preservation: heat preservation and soaking for 2 hours;

[0034] S3: two-stage quenching: immerse the passive helical gear shaft vertically in the calcium chloride solution at a temperature between 810 and 830 degrees Celsius,...

Embodiment 3

[0040] A heat treatment process for a differential 20CrMnTi steel passive helical gear shaft, the chemical element composition and mass percentage of the 20CrMnTi steel passive helical gear shaft are: C: 0.20%, Si: 0.28%, Mn: 0.7%, Cr: 1.6 %, Ti: 0.06%, P<0.04%, S<0.04%, the balance is iron, and the heat treatment process includes the following steps:

[0041]S1: Carburizing: Use the method of heating to high temperature. After the gas carburizing furnace is heated to 900-920 ° C, put the passive helical gear shaft vertically into the furnace, exhaust, keep warm for 2.5 hours, and drop 160-180 kerosene during the heat preservation Drops / min, the temperature of the infiltration layer will drop to 820±10℃ after meeting the requirements;

[0042] S2: heat preservation: heat preservation and soaking for 2 hours;

[0043] S3: two-stage quenching: immerse the passive helical gear shaft vertically in the calcium chloride solution at a temperature between 810 and 830 degrees Celsius,...

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Abstract

The invention provides a thermal treatment process of a 20CrMnTi-steel passive helical gear shaft of a differential gear. The passive helical gear shaft helical gear shaft comprises the chemical elemental ingredients in percentage by mass: 0.18% to 0.22% of C, 0.25% to 0.3% of Si, 0.5% to 0.9% of Mn, 1.2% to 2.0% of Cr, 0.02% to 0.08% of Ti, lower than 0.04% of P, lower than 0.04% of S and the balance of Fe. The 20CrMnTi-steel passive helical gear shaft with high strength, high impact toughness and high tensile property is prepared through performing anti-carburizing treatment, carburization,heat preservation, two-stage quenching, normalizing treatment and tempering treatment and then carrying out machining.

Description

technical field [0001] The invention relates to the technical field of processing mechanical parts, in particular to a heat treatment process for a 20CrMnTi steel driven helical gear shaft of a differential. Background technique [0002] In recent years, with the development of the national economy, the demand for shafts and passive helical gear shaft parts is increasing. Their life and load capacity directly affect the economic benefits of machinery manufacturers, and the improvement of shaft and passive helical gear shaft parts The bearing capacity and service life are more and more important in the machinery industry. Commonly used passive helical gear shafts, shafts and carburized parts need to be forged, cut, and then subjected to heat treatment such as normalizing, carburizing and quenching, and low-temperature tempering to obtain a hard carburized layer on the shallow surface and a hard carburized layer on the center. A structure with good comprehensive mechanical pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/28C23C8/22C21D1/18C21D1/28C22C38/02C22C38/04C22C38/28C21D1/60C21D1/613
CPCC21D9/28C21D1/18C21D1/28C21D1/60C21D1/613C21D2211/001C21D2211/008C22C38/02C22C38/04C22C38/28C23C8/22
Inventor 陈会超祝佩毅
Owner HUBEI WEINENGDA TRANSMISSION CO LTD
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