Carburizing and quenching process of automobile gear

An automotive gear, carburizing and quenching technology, which is applied in the field of heat treatment, can solve the problems of plane warping inter-gear dimensional change, gear scrapping, addendum round and uneven inner hole, etc., so as to improve wear resistance and ensure reliability and the effect of service life

Inactive Publication Date: 2015-02-18
余姚市鸿胜汽车配件有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: in order to solve the problems such as diameter change, uneven change of addendum circle and inner hole, plane warping and gap between teeth after carburizing the finished carburizing process in the prior art. Distortion such as size change, which seriously affects the mechanical properties of automobile gears, and even causes the problem of gear scrapping. The present invention provides a carburizing and quenching process for automobile gears to solve the above problems

Method used

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  • Carburizing and quenching process of automobile gear

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Embodiment

[0040] Use pit gas carburizing furnace to carburize the transmission gear in the automobile gearbox, the material is 20CrMnTi, such as figure 1 shown, including the following steps:

[0041] a) First-level preheating: gradually raise the temperature in the furnace to 880°C, place the automobile gear in the furnace, lower the temperature in the furnace to 750°C, and keep it warm for 30 minutes;

[0042] b) Secondary preheating: Gradually raise the temperature in the furnace to 910°C in 80 minutes, continue to drop methanol in 80 minutes, the amount of dropping methanol is 170 drops / min, continue to drop kerosene in the last 30 minutes of 80 minutes, drop kerosene The amount is 170 drops / min;

[0043] c) Exhaust: evacuate the air in the furnace within 35 minutes and continuously drip kerosene, the amount of kerosene dripping is 185 drops / min;

[0044] d) Strong infiltration: raise the temperature in the furnace to 920°C, the carbon potential is 1.2% Cp, the furnace pressure is...

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Abstract

The invention provides a carburizing and quenching process of an automobile gear. By adopting a pit-type gas carburizing furnace to perform carburizing treatment on the automobile gear, the carburizing and quenching process comprises the following steps: a) performing primary preheating, namely, gradually raising the temperature in the furnace to 880 +/-5 DEG C and then putting the automobile gear in the furnace, gradually reducing the temperature in the furnace to 750 +/-5 DEG C, preserving the heat for 30 minutes. The carburizing and quenching process of the automobile gear disclosed by the invention adopts a manner of repeatedly preheating and diffusing, so that the depth of an effective carburizing layer of the automobile gear is 1.1-1.2mm after carburizing to obtain a finished product, and the surface hardness is 58-62HRC, and therefore, the wear resistance, the strength and the fatigue limit of the components are improved, and the mechanical performances of the gear material are sufficiently brought into play. Moreover, distortions such as diameters changes, uneven changes in an addendum circle and an inner hole, plane warpage as well as dimension changes between gears are not produced, so that the reliability and the service life of the automobile gear are guaranteed.

Description

technical field [0001] The invention relates to the technical field of heat treatment, in particular to a carburizing and quenching process for automobile gears. Background technique [0002] Heat treatment process refers to the whole process of heat treatment of parts. A complete heat treatment process can not only produce qualified products with high quality and high efficiency, improve the service life of products, but also reduce production costs and improve the benefits of enterprises. [0003] Chemical heat treatment is a technology combined with surface alloying and heat treatment. It is to place metal or alloy workpieces in an active medium at a certain temperature for heat preservation, and to infiltrate one or several elements into the surface of the workpiece. Heat treatment, through surface alloying to achieve surface strengthening, while improving surface strength, hardness, wear resistance and other properties, while maintaining the strength and toughness of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/22C21D1/18C21D9/32C23F17/00
Inventor 赵胜
Owner 余姚市鸿胜汽车配件有限公司
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