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Automobile drive axle ring gear heat treatment process

An internal gear and drive axle technology, which is applied in heat treatment furnaces, heat treatment equipment, metal material coating processes, etc. The effect of infiltration temperature, increased coverage, and low quenching temperature

Inactive Publication Date: 2012-04-11
SINO TRUK JINAN POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of quenching distortion and out-of-tolerance deformation of the inner ring gear existing in the prior art process, especially the out-of-round out-of-tolerance problem; to provide a heat treatment process for the inner ring gear of the automobile drive axle; The out-of-tolerance problem of circle loss and deformation after carburizing and quenching heat treatment improves the qualified rate of heat treatment products

Method used

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  • Automobile drive axle ring gear heat treatment process
  • Automobile drive axle ring gear heat treatment process

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] A heat treatment process for the inner ring gear of an automobile drive axle, as shown in the figure, in the figure, the mandrel 1, the inner ring gear 2; including carbonitriding→quenching→cleaning→tempering→correcting deformation processing steps, and also includes the following steps : After the low-temperature carbonitriding process and before the quenching process, immediately put the deformed mandrel into the inner ring gear, and the diameter of the mandrel 1 is 2 teeth of the inner ring gear after low-temperature carbonitriding and direct quenching 100.02% to 100.03% of the diameter of the top circle, and the outer surface of the mandrel 1 is processed with shaped teeth. When the shaped teeth quench the inner ring gear, the quenching oil will have more contact surfaces with the inner ring gear and its own flow will be smoother, so that the ...

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Abstract

The present invention discloses an automobile drive axle ring gear heat treatment process. The process comprises treatment steps of carbonitriding, quenching, cleaning, tempering, and correction and deformation, wherein the following step is performed after the low temperature carbonitriding process and before the quenching process: a mandrel for controlling ring gear deformation is immediately filled in the ring gear. The diameter size of the mandrel is 100.02-100.03% of the diameter size of the ring gear tip circle, wherein the ring gear is subjected to the low temperature carbonitriding treatment and the direct quenching treatment. The shaped teeth are processed on the mandrel excircle, such that the problems of out of roundness, deformation and oversize of the ring gear after the carburizing and quenching heat treatment are solved, the qualification rate of the heat treated product is improved, and the process is especially suitable for the heat treatment of the drive axle ring gear for the heavy truck.

Description

technical field [0001] The invention relates to a carburizing and quenching heat treatment process for cylindrical steel parts, in particular to a heat treatment process for an inner ring gear of an automobile drive axle Background technique [0002] At present, in the heat treatment process of the inner ring gear of the automobile drive axle in the prior art, one is the soft nitriding treatment process. The processing characteristics of this process are that the deformation of the inner ring gear is small and easy to control. lower issues. The second is to adopt the carburizing and quenching process. This process has a deeper hardened layer and a higher fatigue strength. This process has the problems of quenching distortion and deformation of the inner ring gear, especially the problem of out-of-tolerance is still prominent. , The qualified rate of heat treatment is low. Contents of the invention [0003] The purpose of the present invention is to solve the problem of q...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/32C21D1/18C23C8/32C23F17/00
Inventor 韩树王效勇王树韬桂亮
Owner SINO TRUK JINAN POWER
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