A Method to Solve Tooth Top Overseepage of 18crni4a Material Narrow Tooth Shaped Parts

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...

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 tooth parts (the tooth tops are also protected by copper plating), but the experimental results show that this process only relatively lightens the tooth tops. The degree of complete carburization still cannot solve the problem of complete carburization of the tooth top

[0005] As an important part of aeromechanical transmission components, the tooth tip of the narrow toothed part will have a potentially destructive effect. Once the tooth tip is broken, it will directly affect the normal operation of the transmission component and even lead to serious flight accidents.