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Method for improving tooth profile precision after inner spline heat treatment

A technology of tooth shape accuracy and internal splines, which is applied in heat treatment furnaces, heat treatment equipment, coatings, etc., can solve the problems of inability to grind, small modulus, and inability to meet the requirements of spline accuracy

Inactive Publication Date: 2018-07-10
HARBIN DONGAN ENGINE GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The transmission gear of aviation accessories is small in size and structure, so the internal spline usually has a small number of teeth and a small modulus. The small diameter of the spline is generally between 10mm and 40mm. Grinding cannot be performed after carbon heat treatment, and the deformation caused by carburizing heat treatment cannot be eliminated
At present, after heat treatment, the carburizing deformation is usually trimmed by manually grinding the spline tooth profile with a grinding rod, but it cannot meet the precision requirements of the tooth profile 5-6 internal spline at all.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0040] A certain aviation gear shaft is made of 9310 steel, and the minor diameter of the internal spline is 18.5mm. After carburizing, the tooth shape accuracy is required to be +0.008~-0.013mm. The specific operation steps are as follows:

[0041] 1. Internal spline diameter control

[0042] Grinding the small diameter of the inner spline, the tolerance zone after processing is +0~+0.015mm, and the cylindricity of the small diameter is 0.005mm;

[0043] 2. Mandrel production

[0044] Choose No. 45 steel, which has a smaller heat shrinkage rate than the parts, and process 5-level mandrels according to the nominal value of the small diameter of the inner spline 18.5mm, and the dimensional tolerance of each level of mandrels is more than 0.003mm;

[0045] 3. Measurement before heat treatment

[0046] The error of measuring the slope of the inner spline tooth profile is 0.003 ~ 0.004mm;

[0047] 4. Optional mandrel

[0048] Choose a mandrel that matches the small diameter of...

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PUM

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Abstract

The invention relates to a method for improving tooth profile precision after inner spline carburization heat treatment. Data comparison is conducted by measuring the inner spline tooth profile slopesbefore and after heat treatment, the tooth profile slope deformation rule of an inner spline obtained after carburization heat treatment is analyzed and summarized; and through the inverse compensation machining principle, it is guaranteed that the inner spline tooth profile slope error value is in the range of 0-0.015 mm after heat treatment, and the fifth-level or sixth-level spline precision requirement is met.

Description

technical field [0001] The invention relates to a method for improving the tooth shape precision of an internal spline after carburizing heat treatment. Background technique [0002] In the aviation field, the accessory drive gear often uses internal splines as the way to transmit torque. With the continuous improvement of transmission stability requirements and the continuous increase of transmission torque, internal splines are often used for carburizing heat treatment requirements, and splines are required The precision of the tooth part reaches about 5~6 grades. The transmission gear of aviation accessories is small in size and structure, so the internal spline usually has a small number of teeth and a small modulus. The small diameter of the spline is generally between 10mm and 40mm. Grinding cannot be performed after carbon heat treatment, and the amount of deformation caused by carburizing heat treatment cannot be eliminated. At present, the amount of carburizing de...

Claims

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Application Information

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IPC IPC(8): C21D9/00B23P15/00C23C8/00C23C8/20
CPCB23P15/00C21D9/00C23C8/00C23C8/20
Inventor 黄啸张阳关云超孙浩刘薇王作鹏叶君王春雷朱光照王书杭
Owner HARBIN DONGAN ENGINE GRP
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