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A method for preventing excessive seepage of tooth tops of narrow toothed parts made of 16cr3niwmovnbe material

A technology of narrow tooth shape and parts, applied in metal material coating process, superimposed layer plating, coating, etc., can solve the problem of high damage, excessive penetration of tooth top of narrow tooth-shaped parts, and increased risk of tooth top fracture. and other problems to achieve the effect of ensuring normal use and reasonable process technology

Active Publication Date: 2018-01-23
HARBIN DONGAN ENGINE GRP
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  • Summary
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  • Description
  • Claims
  • Application Information

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 of the tooth height and middle part 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 profile through a carburizing method is 4 hours and 40 minutes. The specific steps of carburizing are as follows:

[0026] 1. After the tooth profile is processed, the tooth top and the tooth surfaces on both sides connected to the tooth top shall be protected by copper plating. The protection area of ​​the tooth surface occupies 1 / 5 of the entire tooth surface; the thickness of the copper plating layer is 20μm;

[0027] 2. After copp...

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PUM

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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 over-seepage of the tooth tip of a 16Cr3NiWMoVNbE material narrow tooth-shaped part. Background technique [0002] 16Cr3NiWMoVNbE material is an aerospace gear material developed by the former Soviet Union. Due to its low carbon content, relatively high content of alloying elements, and strong load-bearing capacity, gears made of this material are mostly heavy-duty gears, and the carburized layer depth is usually relatively high. deep. For some tooth-shaped parts with small modulus teeth, when the tooth top width 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 overseepage . After the over-infiltrated part of the part undergoes subsequent quenching and tempering treatments, the carbides in the material carburized layer structure are coarse and dotted, and the impact resistance is gr...

Claims

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Application Information

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Patent Type & Authority Patents(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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