Thermal treatment process for 20CrMnMoA steel bevel gear

A technology of bevel gears and gears, which is applied in the field of heat treatment of 20CrMnMoA steel bevel gears, can solve the problems of low impact toughness, etc., and achieve the effects of improving hardness, high order of organization 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

[0003] 20CrMnMoA steel has higher strength and hardenability than 20CrMnTi steel, but its impact toughness is slightly lower

Method used

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  • Thermal treatment process for 20CrMnMoA steel bevel gear
  • Thermal treatment process for 20CrMnMoA steel bevel gear

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A heat treatment process for a 20CrMnMoA steel bevel gear, the chemical element composition and mass percentage of the 20CrMnMoA steel bevel gear are: C: 0.17%, Si: 0.17%, Mn: 0.8%, Cr: 1.0%, Ti: 0.04%, Mo: 0.20%, Ni<0.03%, Cu<0.03%, P<0.035%, S<0.035%, the balance is iron, and the heat treatment process includes the following steps:

[0026] S1: Preparatory process: cleaning and drying the bevel gear forging, and performing anti-carburization treatment on the web between the teeth of the bevel gear;

[0027] S2: Carburizing: Use the method of heating to high temperature. After the gas carburizing furnace is heated to 950°C, put the bevel gear vertically into the furnace, exhaust, and keep warm for 2.5 hours. Cool down to 830±10°C after the penetration layer meets the requirements;

[0028] S3: heat preservation: heat preservation and soaking for 2 hours;

[0029] S4: Two-stage quenching: immerse the bevel gear vertically in calcium chloride solution at a temperature ...

Embodiment 2

[0035] A heat treatment process for a 20CrMnMoA steel bevel gear, the chemical element composition and mass percentage of the 20CrMnMoA steel bevel gear are: C: 0.23%, Si: 0.37%, Mn: 1.3%, Cr: 1.3%, Ti: 0.12%, Mo: 0.30%, Ni<0.03%, Cu<0.03%, P<0.035%, S<0.035%, the balance is iron, and the heat treatment process includes the following steps:

[0036] S1: Preparatory process: cleaning and drying the bevel gear forging, and performing anti-carburization treatment on the web between the teeth of the bevel gear;

[0037] S2: Carburizing: Use the method of heating to high temperature. After the gas carburizing furnace is heated to 920-930°C, put the bevel gear vertically into the furnace, exhaust, keep warm for 2.5 hours, and drop 160-180 drops of kerosene during the heat preservation. Minutes, cool down to 830±10℃ after the penetration layer reaches the requirement;

[0038] S3: heat preservation: heat preservation and soaking for 2 hours;

[0039] S4: two-stage quenching: immers...

Embodiment 3

[0045]A heat treatment process for a 20CrMnMoA steel bevel gear, the chemical element composition and mass percentage of the 20CrMnMoA steel bevel gear are: C: 0.21%, Si: 0.26%, Mn: 0.11%, Cr: 1.2%, Ti: 0.08%, Mo: 0.25%, Ni<0.03%, Cu<0.03%, P<0.035%, S<0.035%, the balance is iron, and the heat treatment process includes the following steps:

[0046] S1: Preparatory process: cleaning and drying the bevel gear forging, and performing anti-carburization treatment on the web between the teeth of the bevel gear;

[0047] S2: Carburizing: Use the method of heating to high temperature. After the gas carburizing furnace is heated to 920-930°C, put the bevel gear vertically into the furnace, exhaust, keep warm for 2.5h, and drop kerosene 160-180 drops / Minutes, cool down to 830±10℃ after the penetration layer reaches the requirement;

[0048] S3: heat preservation: heat preservation and soaking for 2 hours;

[0049] S4: Two-stage quenching: immerse the bevel gear vertically in calciu...

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Abstract

The invention provides a thermal treatment process for a 20CrMnMoA steel bevel gear. The bevel gear comprises chemical element ingredients in percentage by mass: 0.17% to 0.23% of C, 0.17% to 0.37% ofSi, 0.8% to 1.3% of Mn, 1.0% to 1.3% of Cr, 0.04% to 0.12% of Ti, 0.20% to 0.30% of Mo, smaller than 0.03% of Ni, smaller than 0.03% of Cu, smaller than 0.035% of P, smaller than 0.035% of S and thebalance of iron. The high-intensity high-impact-toughness high-tensile-property 20CrMnMoA steel bevel gear is prepared by machining after carburization prevention treatment, carburization, heat preservation, two stages of quenching, normalization and tempering.

Description

technical field [0001] The invention relates to the technical field of processing mechanical components, in particular to a heat treatment process for 20CrMnMoA steel bevel gears. Background technique [0002] In recent years, with the development of the national economy, the demand for shaft and bevel gear parts has increased, and their life and bearing capacity directly affect the economic benefits of machinery manufacturers. Improve the bearing capacity and bearing capacity of shaft and bevel gear parts Service life is becoming more and more important in the machinery industry. Commonly used bevel gears, 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 good comprehensive The structure of mechanical properties, the structure contains martensite, retained austenite and massive carbides, etc. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/32C21D1/18C21D1/28C23C8/22C22C38/02C22C38/04C22C38/28C22C38/22C22C38/50C22C38/44C22C38/42C22C38/20C21D1/60C21D1/613
CPCC21D9/32C21D1/18C21D1/28C21D1/60C21D1/613C21D2211/001C21D2211/008C22C38/02C22C38/04C22C38/20C22C38/22C22C38/28C22C38/42C22C38/44C22C38/50C23C8/22
Inventor 许向阳赵耀
Owner HUBEI WEINENGDA TRANSMISSION CO LTD
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