Carburizing and quenching method for large and heavy-duty gears

A technology of carburizing, quenching and gears, which is applied in the field of heat treatment, can solve the problems of easy generation of harmful carbides in black tissue, high energy consumption, large deformation, etc., and achieve remarkable technical effects, reduce the number of out-of-furnace links, and reduce tissue stress.

Active Publication Date: 2017-12-05
CRRC QISHUYAN INSTITUTE CO LTD
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  • Description
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Problems solved by technology

[0011] The technical problem to be solved by the present invention is to provide an optimized large-scale heavy-duty gear carburizing and quenching heat treatment method for the shortcomings of long cycle, high energy consumption, large deformation, and easy generation of black tissue and harmful carbides. Carburizing and Quenching Heat Treatment Method for Bearing Gears

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  • Carburizing and quenching method for large and heavy-duty gears
  • Carburizing and quenching method for large and heavy-duty gears

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Embodiment Construction

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

[0035] The invention discloses a carburizing and quenching method for large heavy-duty gears, such as figure 1 shown, including the following steps:

[0036] 1) Heat up, place the gear in the carburizing furnace and heat to 650±30°C for 1-2 hours, continue to heat up to 830±30°C for 1-2 hours, then raise the temperature to 930±10°C;

[0037] 2) Carburizing, put methanol and propane into the carburizing furnace to start carburizing,

[0038] The first is the...

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Abstract

The invention provides a carburizing and quenching method for large heavy-duty gears, which includes a segmented heating and uniform temperature step, a carbon potential step-by-step lowering carburizing step, a segmented cooling and uniform temperature step, a graded quenching step, and a low-temperature tempering step . The carburizing and quenching heat treatment method for large heavy-duty gears provided by the present invention can not only shorten the heat treatment cycle, improve production efficiency, save energy consumption, but also effectively control the heat treatment deformation of the gear, optimize the metallographic structure of the gear surface, and improve the wear resistance of the gear. Comprehensive mechanical properties.

Description

technical field [0001] The invention relates to a heat treatment method, in particular to a carburizing and quenching method for large heavy-duty gears, and belongs to the technical field of heat treatment. Background technique [0002] Gears are one of the commonly used transmission parts in reducers and transmission mechanisms. They are mainly used to support transmission parts, transmit torque and bear loads. During the running process, there are both rolling and sliding between the meshing tooth surfaces of the gears, which are subject to both pulse stress and alternating bending stress. Therefore, the gears need to be heat-treated to have good hardness, wear resistance, and high bending fatigue. strength and impact resistance. [0003] Large-scale heavy-duty gears have large dimensions, heavy loads, and strong impacts, so their safety performance requirements are higher. In addition to good surface hardness and excellent wear resistance, they should also have high over...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/18C21D9/32C23C8/22
Inventor 刘聪敏王文涛樊洋陈亮
Owner CRRC QISHUYAN INSTITUTE CO LTD
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