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Salt bath tufftriding process of differential case

A differential case, soft nitriding technology, applied in the field of heat treatment, can solve the problem of increased dimensional change, and achieve the effects of excellent uniformity, shortened diffusion time, and shortened nitriding time.

Pending Publication Date: 2021-09-21
KUNSHAN SUNMIN DRILUBE ELECTRONIC MATERIAL TECHNOLOGY CO LTD
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AI Technical Summary

Problems solved by technology

Therefore, when nitriding for a long time, the amount of dimensional change will also increase

Method used

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Embodiment Construction

[0025] A salt bath nitrocarburizing process for a differential housing, comprising the following steps:

[0026] S1. Furnace loading: Combine the differential case with special heat treatment tooling to keep the product in a stable state and facilitate subsequent operations;

[0027] S2. Cleaning: remove surface grease by alkaline cleaning;

[0028] S3. Preheating: keep at 350°C for 60 minutes, dry the water, and form an oxide film on the surface at the same time. The nitriding process has a certain penetration promoting effect; at the same time, in order to reduce the thermal stress of the salt bath heating, reduce the thermal shock deformation;

[0029] S4. Salt bath nitrocarburizing: hold at 580°C for 90 minutes, obtain a nitrided layer that meets the requirements with a reasonable combination of nitriding temperature and time; use salt bath soft nitriding process to obtain a nitrided layer that meets the requirements, Achieve extremely small dimensional changes, without t...

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Abstract

The invention discloses a salt bath tufftriding process of a differential case. The salt bath tufftriding process for the differential case comprises the following steps that S1, charging is achieved: the differential case is combined with a special heat treatment tool, so that a stable state of a product is achieved, and subsequent operation is facilitated; S2, cleaning is achieved; S3, preheating is achieved: drying water is achieved, and an oxidation film is formed on the surface; S4, salt bath nitrocarburizing is achieved; S5, cooling is achieved, specifically, cooling is conducted through double media of air cooling and water cooling; S6, post-cleaning is achieved: cleaning is achieved with flowing water to remove residual salt stains on the surface of the product; S7, post-treatment shot blasting is achieved; and S8, rust-proof treatment is achieved. According to the salt bath tufftriding process of the differential case, the production cycle of the product is shortened, and meanwhile, the quality is more stable, so that the total production cost of the product is reduced.

Description

technical field [0001] The invention relates to the field of heat treatment, in particular to a salt bath nitrocarburizing process for a differential case. Background technique [0002] The differential plays an important role in adjusting the speed of the left and right wheels when the car is turning; the high-speed operation of the planetary gear and the main drive shaft requires the differential housing to have excellent wear resistance. Therefore, for the housing Material selection, molding processing and heat treatment all have extremely high requirements; [0003] Material selection: currently the mainstream applicable material is mainly ductile iron. According to the structure of cast iron, the material can reach a tensile strength of 700MPa, which can meet the strength design requirements of the differential housing; [0004] Heat treatment: The differential housing is a precision part, and the dimensional accuracy will affect the life, vibration, and noise; and the...

Claims

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Application Information

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IPC IPC(8): C23C8/56
CPCC23C8/56
Inventor 王建才
Owner KUNSHAN SUNMIN DRILUBE ELECTRONIC MATERIAL TECHNOLOGY CO LTD
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