Thermal treatment method for carburizing and quenching of gearbox gears

A heat treatment method, carburizing and quenching technology, applied in heat treatment furnaces, heat treatment equipment, coatings, etc., can solve problems such as shortening service life, reducing fatigue resistance, and reducing wear resistance

Inactive Publication Date: 2016-05-18
CHONGQING CHUNGU MACHINERY MFG CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

In the existing carburizing and quenching, the carburizing temperature is usually 920-940°C, and the carburizing carburizing potential CP is usually 1.0-1.2C%, in order to obtain a high-quality carburizing surface layer, but it has the following shortcomi

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with embodiment:

[0013] A heat treatment method for carburizing and quenching of transmission gears, comprising:

[0014] A. Carburizing step, put the gear into the material basket, and then put it into a sealed box-type multi-purpose heating furnace. The heating furnace is raised from room temperature to 850-900 ° C for carburizing, and the carburizing time is 2-5 hours; this embodiment Among them, the heating furnace was raised from room temperature to 900°C, and the carburizing time was 2 hours and 40 minutes. After the temperature rises to 850-900°C, methanol and propane are introduced into the heating furnace and carburization begins. The carburization is divided into initial stage, strong infiltration stage and diffusion stage; where: the carbon potential CP in the initial stage of carburization is 0.9-1C%, 12-15 minutes; the carbon potential CP of the strong infiltration stage of carburizatio...

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Abstract

The invention discloses a thermal treatment method for carburizing and quenching of gearbox gears. The thermal treatment method includes the steps of A, carburizing, B, quenching and C tempering. In the step of A, carburizing, the gears are placed in a heating furnace, the temperature of the heating furnace is increased from the room temperature to the temperature of 850-900 DEG C for carburizing, and carburizing time is 2-5 h; the carburizing process includes a beginning stage, a strong carburizing stage and a diffusion stage; the carbon potential (CP) of the beginning stage is 0.9-1 C%, the CP of the strong carburizing stage is 1-1.1 C%, and the CP of the diffusion stage is 0.8-0.9 C%; the time of the beginning stage is 12-15 min, the time of the strong carburizing stage is 200-220 min, and the time of the diffusion stage is 20-40 min. In the step of B, quenching, the carburized gears are cooled to 810-850 DEG C, then temperature equilibrium is carried out for 20-40 min, and then the gears are quenched in quenching oil with the temperature being 85-95 DEG C. In the step C, tempering, the quenched gears are subjected to tempering at the temperature of 155-170 DEG C for 1-2 h.

Description

technical field [0001] The invention relates to a heat treatment method for carburizing and quenching of transmission gears. Background technique [0002] The gear of the automobile transmission is one of the parts with the highest technical requirements. During the operation of the gear, there are both rolling and sliding between the meshing tooth surfaces, and the gear is also subjected to pulse stress and alternating bending stress. Therefore, it is required Gears need to be heat-treated to have good hardness, wear resistance, fatigue resistance, high dimensional accuracy, and low noise during operation. [0003] Carburizing and quenching and carbonitriding are the most important heat treatment methods for surface strengthening of gearbox gears. In the existing carburizing and quenching, the carburizing temperature is usually 920-940°C, and the carburizing carburizing potential CP is usually 1.0-1.2C%, in order to obtain a high-quality carburizing surface layer, but it h...

Claims

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Application Information

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IPC IPC(8): C23F17/00C21D9/32C23C8/22C21D1/18
Inventor 吴家超
Owner CHONGQING CHUNGU MACHINERY MFG CO LTD
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