Carburizing and quenching method of low-speed heavy-duty gear

A low-speed heavy-duty, carburizing and quenching technology, applied in the field of heat treatment, can solve the problems of low surface hardness of gears, tooth surface wear, etc., and achieve the effect of delaying the carbon concentration gradient and prolonging the diffusion carburizing time.

Active Publication Date: 2017-05-31
CRRC QISHUYAN INSTITUTE CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, this method fails to solve the problem of high residual austenite content on the surface of the gear after carburizing and quenching, and the surface hardness of the gear is low, which is prone to early tooth surface wear during subsequent operation

Method used

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  • Carburizing and quenching method of low-speed heavy-duty gear
  • Carburizing and quenching method of low-speed heavy-duty gear
  • Carburizing and quenching method of low-speed heavy-duty gear

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Embodiment Construction

[0032] See figure 1 As shown, the carburizing and quenching method of the low-speed heavy-duty gear of the present invention comprises the following steps,

[0033] ⑴. In the step of heating and uniform temperature, place the gear in the carburizing furnace and heat it to 750±10°C, and the holding time is 2-3h.

[0034] ⑵ Intensive carburizing step, heating the carburizing furnace, heating the gears with the furnace to 930±10°C, passing the carburizing agent into the carburizing furnace for carburizing, controlling the carbon potential CP at 1.15±0.05C%, and maintaining the carburizing time for a period of time t 强渗 , the carbon potential CP is controlled by adjusting the flow rate of the carburizing agent, the carburizing time t in the strong infiltration step of the present invention 强渗 In 10-12h, the carbon content of the austenite in the carburized layer is reduced by lowering the temperature and lowering the carbon potential CP.

[0035] (3) Diffusion step, reduce the...

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Abstract

The invention relates to a carburizing and quenching method of a low-speed heavy-duty gear. The carburizing and quenching method comprises the steps of (1) temperature increase and temperature uniformization; (2) strong carburizing; (3) diffusion; (4) temperature decrease; (5) high-temperature tempering; (6) quenching; (7) cold treatment; and (8) low temperature tempering. According to the carburizing and quenching method of the low-speed heavy-duty gear, harmful carbide of a gear carburized layer can be effectively removed, dispersively distributed fine granular carbide can be obtained, the content of retained austenite on the surface is greatly decreased, a metallographic structure of the gear surface is improved, the surface hardness and abrasion resistance of the gear are improved, and the heat treatment property of a product is improved.

Description

technical field [0001] The invention relates to a carburizing and quenching method for low-speed and heavy-duty gears, belonging to the technical field of heat treatment. Background technique [0002] Low-speed heavy-duty gears are mainly used in the transmission system of large-scale equipment such as mines and metallurgy. The operating conditions are relatively harsh, the transmission power is large, the torque is large, the transmission ratio is large, and the speed is low. The gears in the reduction box are vulnerable to load impact and mechanical vibration. effect and fail. Therefore, low-speed heavy-duty gears not only carry heavy loads and have strong impact, but also require high safety performance. When used, they require excellent surface hardness, wear resistance and anti-overload ability. It requires a deep hardened layer on the tooth surface of the gear, and The mechanical properties of the core of the gear are required to be good. [0003] At present, alloy s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/22C21D1/18C21D9/32
CPCC21D1/18C21D9/32C23C8/22
Inventor 刘聪敏巢海斌邵朋朋王晓华
Owner CRRC QISHUYAN INSTITUTE CO LTD
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