Thermal treatment method for internal spline gear with small modulus

A heat treatment method and internal spline technology, applied in the field of heat treatment, can solve the problem that it is difficult to ensure the depth of the carburized layer of the parts and the hardness of the core part, and achieve the effect of ensuring the use requirements.

Inactive Publication Date: 2013-01-23
HARBIN DONGAN ENGINE GRP
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Problems solved by technology

However, it is difficult to ensure that the depth of the carburized layer and the core

Method used

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Embodiment

[0031] The gear of an engine oil pump is made of 9310 steel. The gear has a spline inside. The diameter of the inner hole of the spline is Φ11.7mm~Φ11.9mm, and the tooth height and thickness are 1~2mm. The required carburizing parameters and deformation requirements are: the effective carburizing layer depth is 0.25-0.51mm, the surface hardness is HRA81-83, and the core hardness is HRC33-41. After carburizing and quenching, the inner hole of the spline is no longer processed. The size between the rolling rods of the spline teeth is Mp=10.765 before carburizing, and the deformation is required to be within 0.05mm after carburizing.

[0032] The specific carburizing and quenching steps are:

[0033] (1) Prepare 9310 steel parts and process the gear part to the required size;

[0034] (2) Refining and tempering the parts in a resistance furnace at a temperature of 820°C for 100 minutes, then oil cooling, then holding for 4 hours at a temperature of 150°C, and air cooling out of...

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PUM

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Abstract

The invention discloses a thermal treatment method for an internal spline gear with small modulus. The method has a principle similar to a press quenching and is characterized in that: a core rod with the size consistent to the size of a spline internal hole is adopted, as the size of the spline internal hole is basically consistent to the size of the core rod, the core rod is inserted into the spline internal hole when a spline is heated to the quenching temperature and is taken out of a furnace for quenching; due to the principle of expansion with heat and contraction with cold, the spline and the core rod are tightly pressed together after oil feeding; due to the limitation of the size and the shape of the core rod, the deformation is limited in a defined range. According to the thermal treatment method, a controllable atmosphere heat treatment furnace is adopted for carburization; and through controlling furnace temperature, insulation time and carbon potential and selecting a proper core rod for quenching thermal treatment, the deformation requirement after carburization and quenching of the spline internal hole can be met. Meanwhile, the grinding step is omitted, the use requirements of a carburized layer and the hardness of the core part of a part can be ensured.

Description

technical field [0001] The invention relates to a heat treatment method, in particular to a small modulus internal spline gear heat treatment method. Background technique [0002] 9310 steel is a material commonly used in aviation. The small modulus internal spline gear made of 9310 steel has both external gear and internal spline. The internal spline has a small through hole diameter (diameter less than 20mm), modulus Small (modulus not greater than 1), tooth height and tooth thickness are relatively thin. Internal splines and external gears are required to have good wear resistance, so chemical heat treatment is usually used, and carburizing and carbonitriding are commonly used to achieve the designed performance and meet the use requirements. At present, gears and internal spline parts have different degrees of quenching deformation after carburizing. In order to control this deformation, a certain amount of carburizing layer allowance is usually left, and the quenching ...

Claims

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Application Information

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IPC IPC(8): C23F17/00C21D9/32C23C8/04C23C8/20
Inventor 曾西军师玉英李海宏辛玉武徐奉鑫张琼张宇慧刘薇钱钰崔雪莹邵秀云
Owner HARBIN DONGAN ENGINE GRP
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