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Gas carburetion method for gear wheel in heavy-duty car

A gas carburizing, heavy-duty vehicle technology, applied in metal material coating process, coating, solid diffusion coating, etc. Obtain the structure of the infiltrated layer, the carbon concentration gradient of the infiltrated layer and the hardness gradient, etc., to achieve a good carbon concentration gradient distribution of the infiltrated layer, improve the internal quality, and have a good hardness gradient distribution.

Inactive Publication Date: 2005-03-30
CHINA NATIONAL HEAVY DUTY TRUCK GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this technology is that the parts are always in a state of high carbon potential during the carburizing period, and a large amount of active carbon atoms are easily accumulated on the surface, which affects the carburizing speed and the carbon concentration gradient distribution of the carburizing layer. Although the diffusion stage is diffused, the workpiece is quenched It is difficult to obtain a good carburized layer structure, carburized layer carbon concentration gradient and hardness gradient

Method used

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  • Gas carburetion method for gear wheel in heavy-duty car
  • Gas carburetion method for gear wheel in heavy-duty car

Examples

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Embodiment

[0024] Example: figure 1 A schematic diagram of the structure of a heavy-duty vehicle gear is given. The gear is a heavy-duty automobile active bevel gear, with a single weight of 18Kg, a modulus of 10, a number of teeth of 21, and a material of 22CrMoH. The technical requirements: the effective carburizing layer depth is 1.1-1.4, and the surface hardness after quenching is HRC59-63. The hardness of the core is HRC33-48, and the metallographic structure conforms to the ZBJ04001-88 automotive gear metallographic carburizing standard. The equipment used is a controlled-atmosphere sealed box-type multi-purpose furnace with a furnace capacity of 40 pieces. Parameters such as time, carbon potential, and temperature can be set and executed in the program of the PVH system, and the process program can be displayed on the screen and has a fault self-diagnosis function. The time is controlled by the time relay; the carbon potential is controlled by the carbon controller, and the sign...

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Abstract

This invention relates to gas carburizing the toothed-wheel of heavy duty automobile. It is characterized that this invention utilizes carbon-potential pulsation type gas carburizing, so it overcomes the prior art short comings that carbonization is proceeded under high carbon-potential and diffusion is finished under low carbon-potential. After quenching, the working-pieces have excellent carburized layer concentration gradient distribution, hardness gradient distribution and carburized layer histogram. This inventive method makes parts thus carburized have long service life under complex condition, after the parts are carburized and have gentle hardness gradient.

Description

(1) Technical field [0001] The invention relates to the gas carburizing technology of heavy-duty automobile gears, and belongs to the technical field of chemical heat treatment of metal materials. (2) Background technology [0002] Heavy-duty automobile gears are carburized by gas; it can change the internal structure, improve the wear resistance, strength and fatigue limit of parts, give full play to the potential performance of materials, and improve the internal quality and service life of parts. The process parameters affecting gas carburizing include carburizing temperature, carburizing carbon potential and carburizing time. In the traditional gas carburizing technology, the carburizing process is generally divided into two stages: carburizing and diffusion, and the carbon potential of the two stages is different. The disadvantage of this technology is that the parts are always in a state of high carbon potential during the carburizing period, and a large amount of act...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/20
Inventor 朱连光李庆见
Owner CHINA NATIONAL HEAVY DUTY TRUCK GROUP
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