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Method for preventing excessive seepage of 16Cr3NiWMoVNbE material narrow-tooth-shaped component tooth crest

A narrow tooth shape and parts technology, which is applied in the metal material coating process, superimposed layer plating, coating, etc., can solve the problem of excessive seepage at the top of the tooth and the risk of tooth top breakage of parts with large destructive materials and narrow tooth shape and other issues to achieve the effect of ensuring normal use and reasonable technology

Active Publication Date: 2016-03-09
HARBIN DONGAN ENGINE GRP
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  • Summary
  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

For parts made of 16Cr3NiWMoVNbE material, once the tip of the tooth is over-infiltrated, the risk of breaking the tip of the tooth will be greatly increased
Especially for parts of aero transmissions, the excessive seepage of tooth tops is potentially extremely destructive. Once the tooth tops are broken, it will directly lead to serious flight accidents
The current traditional carburizing process can easily cause over-seepage on the tooth top of the narrow tooth-shaped parts of this material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0024] The transmission gear on an aircraft is made of 16Cr3NiWMoVNbE, the number of teeth is 12, the modulus is 2.5, and the pressure angle is 20°. The effective width of the tooth top is 1.80mm, the actual effective carburized layer depth in the middle of the high tooth required by the design is 0.9-1.1mm, and the depth of the tooth top carburized layer is controlled within 1.2mm. The specific operation steps are as follows:

[0025] The total time required for this product to ensure the thickness of the carburized layer in the middle of the tooth shape of the part through one-time carburizing is 4 hours and 40 minutes. The specific steps of carburizing are as follows:

[0026] 1. After processing the tooth shape of the tooth-shaped parts, the top of the tooth and the tooth surfaces on both sides connected to the top are protected by copper plating. The protection area of ​​the tooth surface accounts for 1 / 5 of the entire tooth surface; the thickness of the copper plating lay...

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Abstract

The invention relates to a method for preventing excessive seepage of a 16Cr3NiWMoVNbE material narrow-tooth-shaped component tooth crest. The traditional thermal treatment technology is changed, primary carburization is changed into secondary carburization, and after the primary carburization is ended, only a tooth crest copper plating layer area is reserved, and secondary carburization is carried out. By means of the technology, a carburization layer of the tooth crest of a component in the thermal treatment process is finally qualified, and the phenomenon of excessive seepage of the tooth crest cannot happen. The technology is reasonable, when the high and medium part of component teeth can meet the design requirement, the thickness of the carburization layer of the tooth crest can also meet the requirement, and normal usage of the component is guaranteed.

Description

technical field [0001] The invention relates to a method for preventing excessive seepage of tooth tops of narrow-toothed parts made of 16Cr3NiWMoVNbE material. Background technique [0002] The 16Cr3NiWMoVNbE material is an aviation gear material developed by the former Soviet Union. Due to its low carbon content, relatively high alloy element content, and strong load-bearing capacity, the gears made of this material are mostly heavy-duty gears, and the carburized layer depth is usually higher. deep. For some tooth-shaped parts with small modulus teeth, when the width of the tooth top is less than twice the actual effective carburized layer depth, the carburized layers on both sides of the tooth top will overlap after carburizing, which is commonly known as over-infiltration phenomenon. . After the subsequent quenching and tempering treatment of the over-infiltration part of the part, the carbides in the carburized layer structure of the material are coarse and point-conn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/00C23C8/20C25D7/00
CPCC23C8/20C23C28/36C25D7/00
Inventor 孙振淋辛玉武师玉英鞠殿巍李连亮徐奉鑫任师伟吴彦芬金玉亮张宇慧郭宗斌
Owner HARBIN DONGAN ENGINE GRP
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