Method for solving problem of excessive seepage of 18CrNi4A material narrow-tooth-shaped component tooth crest

A technology of narrow tooth shape and parts, which is applied in the field of over-infiltration of tooth tops of narrow tooth-shaped parts made of 18CrNi4A material. Reasonable effect of use requirements and process technology

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

AI Technical Summary

Problems solved by technology

In order to prevent the occurrence of complete carburization (over carburization) on the tooth top, the existing technology usually adopts a method of carburizing the tooth surface in a controlled atmosphere furnace after copper plating on the tooth surface. However, this This method cannot solve the problem of complete carburization of the tooth top
The low-pressure vacuum carburizing technology is becoming more and more mature, and the low-pressure vacuum carburizing process is proposed to solve the problem of complete carburization of the tooth tops of narrow to

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment

[0027] The material is 18CrNi4A, the modulus m=2.822, the number of teeth is 47, and the pressure angle is 20 o gears as an example. The effective carburized layer depth at the middle of the tooth center is required to be 0.85-1.05mm, and the effective carburized layer depth at the tooth top required by the design is required to be 0.85-1.05mm. The specific carburizing steps are:

[0028] 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 of the tooth are protected by copper plating. The thickness of the copper plating layer is 2 μm;

[0029] 2. After copper plating, the parts are cleaned and transferred to a controlled atmosphere heat treatment furnace;

[0030] 3. The carburizing potential of the controllable atmosphere furnace is set to 1.10, the carburizing temperature is 900°C, and the first carburizing time is set to 1 hour; Medium cooling;

[0031] 4. Temper in a high-temperatu...

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Abstract

The invention relates to a method for solving the problem of excessive seepage of an 18CrNi4A material narrow-tooth-shaped component tooth crest. The traditional thermal treatment technology is changed, primary carburization is changed into secondary carburization, the measure that before primary carburization, a copper plating protection area extends to the two side tooth face parts connected with the tooth crest from the tooth rest is taken, finally, a carburization layer of the tooth crest of the component in the thermal treatment process is qualified, and the phenomenon of excessive seepage of the tooth crest cannot happen. The technology is reasonable, an ideal effect is achieved, and the normal usage requirement for the component is guaranteed.

Description

technical field [0001] The invention relates to a method for solving the excessive seepage of the tooth top of a narrow-toothed part made of 18CrNi4A material. Background technique [0002] Under normal circumstances, there is a corresponding relationship between the depth of the carburized layer of toothed parts and its modulus, and the depth of the carburized layer is mostly about (0.15-0.25) m (m is the modulus of the gear). After the gear is quenched, problems such as decarburization and deformation will occur. Considering the reduction of the carburized layer depth caused by grinding and correcting the tooth profile, the actual effective carburized layer depth needs to be based on the carburized layer depth given by the original product design. Add about 0.20 to 0.30mm on top. [0003] In small modulus gears, when the tooth top width is close to twice the actual effective carburized layer depth at the middle of the tooth, due to the large curvature of the tooth surface...

Claims

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Application Information

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IPC IPC(8): C23C28/00C23C8/20C25D7/00
CPCC23C8/20C23C28/36C25D7/00
Inventor 孙振淋师玉英辛玉武周动林王国成李殿峰吴彦芬金玉亮张宇慧郭宗斌
Owner HARBIN DONGAN ENGINE GRP
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