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Gear carburization process and application thereof

A gear and carburizing technology, which is applied in the field of heat treatment, can solve the problems of cumbersome process and achieve the effects of simplifying the process, controlling the coarsening of the structure and shortening the residence time

Active Publication Date: 2018-12-25
CRRC QISHUYAN INSTITUTE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the object of the present invention includes providing a gear carburizing process and its application to improve the problem that gears in the prior art need to be quenched multiple times and the process is more complicated, and to refine the structure grains and improve the structure performance

Method used

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  • Gear carburization process and application thereof
  • Gear carburization process and application thereof
  • Gear carburization process and application thereof

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Embodiment

[0086] The selected gear material of this embodiment is low carbon alloy steel 18CrNiMo7-6, its A c1 Point is 738°C, A c3 The temperature is 815°C, and the effective hardened layer depth is required to be 3.0-3.4mm. Conventional carburizing gears are put into the furnace at 900°C, and the carburizing process temperature is 920°C. It takes 50 hours for the process of strong infiltration and diffusion at this temperature. After tempering at 640°C, reheat to 840°C for quenching, such as figure 1 shown. Table 1 shows the structure and properties after conventional carburizing treatment, and Table 2 shows the mechanical properties after this process. Figure 2a is the surface tissue under this process, Figure 2b It is the heart tissue under this process. The conventional carburizing process takes a very long time, and after a long time of heat preservation, the structure grows and the mechanical properties decrease.

[0087] Table 1

[0088]

[0089] Table 2

[0090] ...

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Abstract

The invention relates to the technical field of heat treatment, and discloses a gear carburization process and application thereof. The gear carburization process comprises the following steps of pre-carburization, re-carburization and cooling and heat prevention. The pre-carburization and the re-carburization comprise carburization in different carbon potentials from high to low, and the circulation is carried out for more than one time. The carburization process has the advantages that the permeating rate is fast, the standing time of gear materials at high temperature is shortened, and themicrostructure is refined; and the surface carbon concentration is proper, the permeability layer gradient is gentle, penetrating agents are saved, and energy resources are saved. The short time heatprevention of gears in a perlitic transformation area can enable the gears to effectively diffuse and separate out alloy carbides in a hardened layer area, the microstructure coarsening is restrained,and gears with better microstructure performance are obtained; and the subsequent quenching times can be reduced, and the process is simplified. Conditions are created for reducing the manufacturingcost of the type of gears due to the fact that the process improves the heat treatment efficiency of heavy-load gears, and improves the product microstructure performance.

Description

technical field [0001] The invention relates to the technical field of heat treatment, in particular to a gear carburizing process and its application. Background technique [0002] Deep carburizing can obtain higher core hardness and smaller residual tensile stress in the transition zone, and has become the most effective surface strengthening method for heavy-duty gears at home and abroad. Generally, the carburizing process is carried out at about 930°C, which is a process with high energy consumption, low efficiency and large pollution in the gear production process. Increasing the carburizing temperature can significantly reduce the carburizing time and improve production efficiency. [0003] After heavy-duty gears are carburized at high temperature, they are generally quenched multiple times, or their raw materials are microalloyed to control grain growth. Multiple times of quenching can reduce the grain size of the gear and improve its comprehensive performance, but ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/22
CPCC23C8/22
Inventor 陈强
Owner CRRC QISHUYAN INSTITUTE CO LTD
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