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Non-brittle nitridation technique for bearing components

A bearing component, brittle technology, applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of uneven distribution, difficulty in improving strength, matching performance and service life limitations, etc., to make up for the lack of toughness , The amount of deformation is small, and the effect of solving the depth of the nitride layer

Inactive Publication Date: 2017-11-07
JIANGSU FENGDONG HEAT TREATMENT & SURFACE MODIFICATION ENG & TECH RES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Bearing components are essential generalized standardized parts for mechanical equipment, and have a wide range of applications. Bearing retainers are important components of bearings, and the social demand is huge; bearing retainers are matched with steel balls and installed in bearing rings. Maintaining contact and friction with steel balls has high requirements on the mechanical properties of the material; generally, when processing bearing retainers, they must undergo heat treatment to improve the strength and hardness of the product surface and enhance wear resistance. Heat treatment, although the corrosion resistance is improved, but the distribution is uneven, the strength is difficult to improve, and the matching performance and service life are limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] This embodiment provides a non-brittle nitriding process for bearing components, which specifically includes the following steps:

[0023] a: Send the bearing parts to the nitriding furnace for heating, heat the temperature to 240°C, press the furnace cover tightly, start the vacuum pump to vacuum, open the intake valve, fill in nitrogen, check whether there is air leakage in the nitriding furnace, if there is any leakage When the temperature drops to 90°C, open the cover of the nitriding furnace and continue to cool down. When the temperature drops to room temperature, check the problem. If there is no air leakage, raise the temperature to 340°C for 1.5 hours, and prepare to enter inflation stage;

[0024] b: When the temperature in the nitriding furnace rises to 340°C, feed the mixture of ammonia gas, penetrant and ammonium chloride concentrated solution, in which the concentration of ammonium chloride is 38%, and the concentration of penetrant is 0.035%. The gas ven...

Embodiment 2

[0031] This embodiment provides a non-brittle nitriding process for bearing components, which specifically includes the following steps:

[0032] a: Send the bearing parts to the nitriding furnace for heating, heat the temperature to 250°C, press the furnace cover tightly, start the vacuum pump to vacuum, open the intake valve, fill in nitrogen, check whether there is air leakage in the nitriding furnace, if there is any leakage When the temperature drops to 95°C, open the cover of the nitriding furnace and continue to cool down. When the temperature drops to room temperature, check the problem. If there is no air leakage, raise the temperature to 350°C for 2 hours, and prepare to enter the gas filling process. stage;

[0033] b: When the temperature in the nitriding furnace rises to 350°C, feed ammonia gas, a mixture of penetrating agent and ammonium chloride concentrated liquid, in which the concentration of ammonium chloride is 40%, the concentration of penetrating agent is...

Embodiment 3

[0040] This embodiment provides a non-brittle nitriding process for bearing components, which specifically includes the following steps:

[0041] a: Send the bearing parts to the nitriding furnace for heating, heat the temperature to 250°C, press the furnace cover tightly, start the vacuum pump to vacuum, open the intake valve, fill in nitrogen, check whether there is air leakage in the nitriding furnace, if there is any leakage When the temperature drops to 90°C, open the cover of the nitriding furnace and continue to cool down. When the temperature drops to room temperature, check the problem. If there is no air leakage, raise the temperature to 348°C for 2 hours, and prepare to enter the gas filling process. stage;

[0042] b: When the temperature in the nitriding furnace rises to 348°C, feed the mixture of ammonia gas, penetrant and ammonium chloride concentrated solution, in which the concentration of ammonium chloride is 41%, and the concentration of penetrant is 0.033%....

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Abstract

The invention discloses a non-brittle nitridation technique for bearing components. According to the technological process, whether the interior of a nitridation furnace leaks air or not is detected firstly, if the air is not leaked, the inflation stage is executed, and then the temperature in the nitridation furnace is increased to 300-350 DEG C; ammonia gas and mixed liquid of a penetrating agent and ammonium chloride concentrated liquid are led into the nitridation furnace, the leading-in speeds of the ammonia gas and the mixed liquid of the penetrating agent and the ammonium chloride concentrated liquid are controlled, and the interior of the furnace continues to be heated till the temperature is 480-500 DEG C; then the leading-in speeds of the ammonia gas and the mixed liquid of the penetrating agent and the ammonium chloride concentrated liquid are increased, and the temperature of the interior of the furnace is increased to 520-550 DEG C; then the inflation speed of the ammonia gas is decreased, and leading-in of the ammonia gas and the mixed liquid of the penetrating agent and the ammonium chloride concentrated liquid is stopped; gas in the furnace is discharged, the pressure in the furnace is controlled, and the temperature in the furnace is decreased to 100-130 DEG C; and finally an ammonia gas bottle and a nitridation furnace gas inlet valve are closed, vacuumizing is conducted, nitrogen gas is led into the furnace to enable the pressure of the interior of the furnace to be positive, the valve is opened, air in the furnace is replaced, the temperature is decreased, and the components are taken out. According to the non-brittle nitridation technique for the bearing components, the problems that as for an existing nitridation technique, the depth of the effective nitridation layer is small, the surface hardness is low, and deformation is large can be effectively solved.

Description

technical field [0001] The invention relates to a processing technology for bearing parts, in particular to a non-brittle nitriding technology for bearing parts. Background technique [0002] Bearing components are essential generalized standardized parts for mechanical equipment, and have a wide range of applications. Bearing retainers are important components of bearings, and the social demand is huge; bearing retainers are matched with steel balls and installed in bearing rings. Maintaining contact and friction with steel balls has high requirements on the mechanical properties of the material; generally, when processing bearing retainers, they must undergo heat treatment to improve the strength and hardness of the product surface and enhance wear resistance. Heat treatment, although the corrosion resistance is improved, but the distribution is uneven, the strength is difficult to improve, and the matching performance and service life are limited. Contents of the invent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/24
CPCC23C8/24
Inventor 史有森袁彬
Owner JIANGSU FENGDONG HEAT TREATMENT & SURFACE MODIFICATION ENG & TECH RES CO LTD
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