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Powder metallurgy self-lubricating bearing and preparation method thereof

A technology of self-lubricating bearings and powder metallurgy, which is applied to bearings, bearing components, shafts and bearings, etc., can solve the problems of poor control of graphite addition, affecting bearing crushing strength, and low service life of steel bearings, so as to improve self-lubricating bearings. Lubrication effect, improvement of friction and wear performance, and effect of improving wear resistance

Inactive Publication Date: 2019-11-01
LAIWU KELI NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially for mining machinery, due to the harsh working environment, the service life of steel bearings is very low, and the service life is generally 3-4 months. The existing ordinary powder metallurgy bearings used in mining machinery have a service life of 1-1. 1.5 times, the service life is still very short
[0004] At present, graphite elements have a good lubricating effect. Adding graphite can improve the self-lubricating effect of the lubrication system, but the amount of graphite added is not easy to control. If the amount of graphite added is small, the self-lubricating effect is poor. If the amount of graphite added is large , will form cementite, the hardness of cementite is very high, but the plasticity and impact toughness are almost equal to zero, and the brittleness is extremely high, which affects the crushing strength of the bearing

Method used

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  • Powder metallurgy self-lubricating bearing and preparation method thereof
  • Powder metallurgy self-lubricating bearing and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for preparing a powder metallurgy self-lubricating bearing, comprising the following steps:

[0029] (1) raw materials are mixed, and described raw material is made up of the component of following percentage by weight: carbon 2%, copper 2%, molybdenum disulfide 1.5%, iron surplus;

[0030] (2) Compression molding, the green body density after molding is 6.82g / cm 3 ;

[0031] (3) Sintering, the sintering temperature is 1120°C, the temperature is kept for 30 minutes, and the whole process is protected by nitrogen gas.

[0032] (4) Oil immersion treatment, immersion in 32# engine oil, oil temperature 75°C, vacuum pressure value 0.1mpa, time 30min; after oil immersion, the oil content is 13.5%. After oil immersion, the oil content of the material is tested by volume percentage computational.

Embodiment 2

[0034] A method for preparing a powder metallurgy self-lubricating bearing, comprising the following steps:

[0035] (1) mixing the raw materials, the raw materials are made up of the following components in weight percentage: 2.5% carbon, 1% copper, 0.5% molybdenum disulfide, and iron balance;

[0036] (2) Compression molding, the green body density after molding is 6.83g / cm 3 ;

[0037] (3) Sintering, the sintering temperature is 1120°C, the temperature is kept for 40 minutes, and the whole process is protected by nitrogen gas.

[0038] (4) Oil immersion treatment, immerse in 32# engine oil, the oil temperature is 85°C, the vacuum pressure value is 0.1mpa, and the time is 20min; the oil content after oil immersion is 13.5%. After oil immersion, the oil content of the material is calculated by volume percentage.

Embodiment 3

[0040] A method for preparing a powder metallurgy self-lubricating bearing, comprising the following steps:

[0041] (1) raw materials are mixed, and described raw material is made up of the component of following percentage by weight: carbon 2.3%, copper 1.5%, molybdenum disulfide 1%, iron balance;

[0042] (2) Compression molding, the green body density after molding is 6.82g / cm 3 ;

[0043] (3) Sintering, the sintering temperature is 1120°C, the temperature is kept for 35 minutes, and the whole process is protected by nitrogen gas.

[0044] (4) Oil immersion treatment, immersion in 32# engine oil, oil temperature 80°C, vacuum pressure value 0.1mpa, time 25min; oil content after oil immersion is 14%, after oil immersion, the oil content of the material is tested by volume percentage computational.

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Abstract

The invention discloses a preparation method of a powder metallurgy self-lubricating bearing. The preparation method comprises the following steps that (1) raw materials are mixed, wherein the raw materials are composed of the following components of, by weight percent, 2%-2.5% of carbon, 1%-2% of copper, 0.5%-1.5% of molybdenum disulfide and the balance iron; (2) compression molding is performed,wherein the density of a molded blank is 6.7g / cm<3>-6.9g / cm<3>; (3) sintering is performed; and (4) oil immersion treatment is performed. According to the preparation method, through the three kindsof components of the carbon, the copper and the molybdenum disulfide and use amount mutual combination and mutual cooperation effects of all the components, the sintered body has a relatively good self-lubricating effect, the wear resistance is good, moreover, the crushing strength is high, and the service life of the product is prolonged.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to a powder metallurgy self-lubricating bearing and a preparation method thereof. Background technique [0002] Powder metallurgy is a processing method that uses metal powder as raw material to make various products by pressing and sintering. The production process of powder metallurgy parts has the advantages of rapid prototyping ability of complex parts and high utilization rate of materials, so it is widely used. [0003] Machinery will generate friction during operation, and lubrication is required between machines to ensure their life. Especially for mining machinery, due to the harsh working environment, the service life of steel bearings is very low, and the service life is generally 3-4 months. The existing ordinary powder metallurgy bearings used in mining machinery have a service life of 1-1. 1.5 times, the service life is still very short. [0004] At presen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/02B22F3/10B22F3/26C22C38/16C22C38/60C22C38/12C22C37/00F16C33/10F16C33/12F16C33/14
CPCB22F3/02B22F3/10B22F3/26C22C37/00C22C38/12C22C38/16C22C38/60F16C33/1095F16C33/121F16C33/145F16C2202/50F16C2202/52F16C2202/54F16C2204/60F16C2220/20
Inventor 吕强李伟段崇和吕耐波
Owner LAIWU KELI NEW MATERIAL
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