Heat treatment process of gear steel for automobile gearbox

A technology for automobile gearboxes and gear steels, applied in heat treatment furnaces, heat treatment equipment, metal material coating processes, etc., can solve problems such as easy cracking, achieve good wear resistance, improve mechanical properties and wear resistance, reduce The effect of energy consumption

Inactive Publication Date: 2020-08-07
江苏联峰实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the deficiencies of the prior art, the object of the present invention is to provide a heat treatment process for gear steel used in automobile gearboxes, which is used to improve the problem of easy cracking in the heat treatment process of gear steel, shorten the heat treatment time, improve production efficiency, and reduce energy consumption. consumption

Method used

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  • Heat treatment process of gear steel for automobile gearbox

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Effect test

Embodiment 1

[0027] The invention provides a heat treatment process of gear steel for automobile gearbox, including normalizing process, rough and semi-finishing process, carburizing process, quenching process, low temperature tempering process, shot blasting and processing inspection process, specifically Include the following steps:

[0028] (1) The chemical composition of the billet used in the normalizing process is calculated by weight percentage: C: 0.18%, Si: 0.20%, Mn: 0.93%, P: 0.008%, S: 0.005%, Al: 0.025%, Ti : 0.03%, Cr: 1.08%, Ni: 0.05%, and the rest are Fe and unavoidable impurities. The temperature in the normalizing section is 880°C, keep warm for 0.5h, then quickly cool to 680°C and keep warm for 1h, the quick cooling adopts air cooling or spray cooling, and the cooling rate is 30°C / s;

[0029] (2) The oil is cooled to room temperature, and then subjected to rough and semi-finish cutting; the room temperature refers to 20°C.

[0030] (3) The temperature of the control pr...

Embodiment 2

[0037] The invention provides a heat treatment process of gear steel for automobile gearbox, including normalizing process, rough and semi-finishing process, carburizing process, quenching process, low temperature tempering process, shot blasting and processing inspection process, specifically Include the following steps:

[0038] (1) The chemical composition of the billet used in the normalizing process is calculated by weight percentage: C: 0.19%, Si: 0.22%, Mn: 0.95%, P: 0.01%, S: 0.008%, Al: 0.027%, Ti : 0.04%, Cr: 1.10%, Ni: 0.08%, and the rest are Fe and unavoidable impurities. The temperature in the normalizing section is 880°C, keep warm for 0.8h, then quickly cool to 700°C and keep warm for 1.5h, the quick cooling adopts air cooling or spray cooling, and the cooling rate is 40°C / s;

[0039] (2) The oil is cooled to room temperature, and then subjected to rough and semi-finish cutting; the room temperature refers to 20°C.

[0040](3) The temperature of the control pr...

Embodiment 3

[0047] The invention provides a heat treatment process of gear steel for automobile gearbox, including normalizing process, rough and semi-finishing process, carburizing process, quenching process, low temperature tempering process, shot blasting and processing inspection process, specifically Include the following steps:

[0048] (1) The chemical composition of the billet used in the normalizing process is calculated by weight percentage: C: 0.20%, Si: 0.24%, Mn: 0.97%, P: 0.012%, S: 0.01%, Al: 0.030%, Ti : 0.05%, Cr: 1.14%, Ni: 0.10%, and the rest are Fe and unavoidable impurities. The temperature in the normalizing section is 880°C, keep warm for 01h, then quickly cool to 720°C and keep warm for 2h, the quick cooling adopts air cooling or spray cooling, and the cooling rate is 50°C / s;

[0049] (2) The oil is cooled to room temperature, and then subjected to rough and semi-finish cutting; the room temperature refers to 20°C.

[0050] (3) The temperature of the control preh...

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Abstract

The invention provides a heat treatment process of gear steel for an automobile gearbox. The heat treatment process comprises the steps of normalizing, coarse semi-finished cutting processing, carburizing, quenching, low temperature tempering, shot blasting and processing inspection; in the carburizing process, preheating and pre-carburizing processes are increased to clean impurities, oil stainsand the like attached to the surface of a billet, so that the internal temperature and external temperature of the billet is the consistent, a basis is laid for further temperature rise, heating timeis shortened, and energy consumption is reduced; the temperature and carburizing time in the carburizing process are controlled to obtain flat carbon concentration distribution, stress caused by carburizing heat treatment is reduced, and the mechanical property and wear-resisting property of the surface of the billet are effectively improved; and meanwhile, the billet ingredients, the heating temperature, heat preservation time, cooling speed and other process parameters are controlled, the billet is subjected to carbon potential rising and falling treatment, the process of normalizing, quenching and tempering is optimized, a production cycle is shortened, the energy consumption and production cost are reduced, and the heat treatment process is suitable for producing the gear steel for automobile gearboxes with various specifications.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a heat treatment process for gear steel used in automobile gearboxes. Background technique [0002] Gear is one of the most critical components in the transmission mechanism of the gearbox. It bears the impact load during the transmission process, and the tooth surface is prone to fatigue pitting during the meshing transmission process. As gearboxes have higher and higher requirements for transmission stability and noise, the processing technology of gear steel, especially the heat treatment process, has also put forward higher requirements. The existing low-phosphorus gear steels for automotive transmissions have effectively achieved low-phosphorus control through operations such as dephosphorization and slag overflow, reducing local enrichment of phosphides, and have good cutting performance. High gear teeth can be obtained after surface carburizing treatment. The surface h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/28C21D1/18C23C8/22C21D6/00C21D9/00C22C38/02C22C38/04C22C38/06C22C38/50
CPCC21D1/18C21D1/28C21D6/004C21D6/005C21D6/008C21D9/0081C22C38/002C22C38/02C22C38/04C22C38/06C22C38/50C23C8/22
Inventor 赵小军蔡雪贞徐书成
Owner 江苏联峰实业有限公司
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