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Multi-stage deep carburizing method for large heavy-duty gears

A multi-stage, carburizing technology, applied in the field of heat treatment, can solve the problems of high energy consumption, long time, and the carburized layer on the surface of the gear is prone to large block and network carbides, etc., so as to improve production efficiency and improve metallographic properties. Organizational and technical effects have significant effects

Active Publication Date: 2017-09-26
CRRC QISHUYAN INSTITUTE CO LTD
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  • Abstract
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide an optimized method for the existing deep carburizing method for large heavy-duty gears, which takes a long time, consumes a lot of energy, and the carburized layer on the surface of the gear is prone to produce large block and reticular carbides. Deep carburizing heat treatment method for large and heavy-duty gears

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  • Multi-stage deep carburizing method for large heavy-duty gears
  • Multi-stage deep carburizing method for large heavy-duty gears

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Embodiment Construction

[0030] 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.

[0031] The invention discloses a multi-stage deep carburizing method for large heavy-duty gears, such as figure 1 shown, including the following steps:

[0032] 1) Place large heavy-duty gear parts in a carburizing furnace and heat them to 910±10°C;

[0033] 2) Carburize the gear parts in the carburizing furnace for the first strong infiltration, the furnace temperature is maintained at 910±10°C, the holding time is 5-6 hours, and the carbon potential CP is ...

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Abstract

The invention provides a multi-stage deep carburizing method for large heavy-duty gears, comprising the following steps: primary infiltration; primary diffusion; secondary infiltration; secondary diffusion; cooling; quenching; cleaning; tempering; The deep carburizing heat treatment method for gear parts of the present invention adopts a multi-stage temperature-raising and variable carbon potential method, which can effectively solve the problem that the carburized layer on the surface of the gear is prone to produce large block and mesh carbides, and obtain fine-grained carbides in a dispersed distribution. Carbide can improve the metallographic structure of the gear surface, increase the hardness and wear resistance of the gear tooth surface, and at the same time obtain a high carburizing speed, shorten the heat treatment time, reduce energy consumption, and improve production efficiency.

Description

technical field [0001] The invention relates to a deep carburizing heat treatment method for iron and steel workpieces, in particular to a deep carburizing method for large heavy-duty gears, and belongs to the technical field of heat treatment. Background technique [0002] In order to obtain a certain strength, toughness and wear resistance, gear parts need to undergo a series of heat treatments such as quenching and tempering, carburizing and quenching, and tempering. Large-scale heavy-duty gears have large dimensions, heavy loads, strong impact, and high safety performance requirements. When used, they require excellent surface hardness, wear resistance, and overload resistance. The metallographic structure of the gear surface is required to be good. [0003] At present, the deep carburizing method of large heavy-duty gears basically adopts two-stage carburizing, such as figure 2 As shown, it is the method of reducing the carbon potential at constant temperature. This m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F17/00C23C8/22
Inventor 刘聪敏陈强王晓华李玉
Owner CRRC QISHUYAN INSTITUTE CO LTD
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