High-strength and wear-resisting iron based powder metallurgic bearing

An iron-based powder metallurgy and bearing technology, which is applied in the field of high-strength wear-resistant iron-based powder metallurgy bearing materials, can solve the problems of low strength performance, bearing wear, short life, etc., achieve good anti-seizure performance, increase hardness, and increase strength Effect

Active Publication Date: 2015-07-22
合肥波林新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Sliding bearings are commonly used parts in various machinery, and the sliding bearing materials are required to have sufficient compressive strength and fatigue resistance, good anti-friction and wear resistance (small friction coefficient), the function of storing lubricating oil and good running-in performance , Iron-based powder metallurgy materials are the most commonly used bearing materials. According to my country's GB / T-2012 "Sliding Bearing Powder Metallurgy Technical Conditions", iron-based bearing materials are sintered, and the grade with the highest crushing strength is FZ12162. It is K≥380MPa, and the oil content is ≥12%. Due to the low strength and low hardness of the material, the bearing is worn out and the service life is short, which cannot meet the working conditions of the bearing at low speed, large load and certain impact load. , such as bearings for oil cylinders of construction machinery such as excavators and bulldozers

Method used

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  • High-strength and wear-resisting iron based powder metallurgic bearing
  • High-strength and wear-resisting iron based powder metallurgic bearing
  • High-strength and wear-resisting iron based powder metallurgic bearing

Examples

Experimental program
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Effect test

Embodiment 1

[0023] A bearing for a high-pressure oil cylinder of an excavator is manufactured from the high-strength wear-resistant iron-based powder metallurgy bearing material and the preparation method thereof of the present invention.

[0024] The composition of the high-strength wear-resistant iron-based powder metallurgy bearing material in this embodiment is shown in Table 1.

[0025] Table 1 Bearing material composition (by weight percentage):

[0026] Element

copper

the carbon

Cerium fluoride

Impurities

iron

wt(%)

16.0

0.9

0.01

≤2.0

margin

[0027] The preparation method of the iron-based powder metallurgy bearing material is completed according to the following steps:

[0028] 1. Mixing: Mixing according to the ratio of material components in Table 1, using a V-shaped mixer to mix evenly, and the mixing time is 30 minutes to obtain mixed powder.

[0029] In the raw material powder: the iron powder is an atomized...

Embodiment 2

[0039] The utility model relates to a bearing for an oil cylinder of a bulldozer. The composition of the high-strength wear-resistant iron-based powder metallurgy bearing material in this example is shown in Table 3.

[0040] Table 3 Bearing material composition (by weight percentage)

[0041] Element

copper

the carbon

Cerium fluoride

Impurities

iron

[0042] wt(%)

16.8

0.88

0.40

≤2.0

margin

[0043] The difference between this embodiment and Example 1 is that in this embodiment, 0.3wt% zinc stearate and 0.5wt% micronized wax are added; the mixing time is 40 minutes; the pressing pressure is 600MPa; the sintering temperature is 1150°C, and the sintering time The heat treatment temperature is 910°C, the carbon potential is 0.85, the tempering temperature is 190, and the tempering time is 2 hours; after heat treatment, the product is immersed in oil, the oil temperature is 95-100°C, the vacuum pressure ...

Embodiment 3

[0047] The utility model relates to a bearing for a hydraulic cylinder equipped with a suspension device of a construction machinery vehicle. The composition of the high-strength wear-resistant iron-based powder metallurgy bearing material in this example is shown in Table 5.

[0048] Table 5 Bearing material composition (by weight percentage)

[0049] Element

copper

the carbon

rare earth

Impurities

iron

wt(%)

17.5

0.85

0.70

≤2.0

margin

[0050] The difference between this example and Example 1 is that in this example, 0.3wt% zinc stearate and 0.04wt% spindle oil are added; the mixing time is 60 minutes; the pressing pressure is 550MPa; the sintering temperature is 1120°C, and the sintering time 45 minutes; the heat treatment temperature is 920°C, the carbon potential is 0.80, the tempering temperature is 220°C, and the tempering time is 2 hours; after heat treatment, the product is immersed in oil, the oil tem...

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Abstract

The invention discloses a high-strength wearproof iron-based powder metallurgy bearing material and a preparation method thereof. The high-strength wearproof iron-based powder metallurgy bearing material is characterized by being composed of the following components by weight percent: 16.0%-18.0% of copper, 0.80%-0.90% of carbon, 0.01%-1.0% of cerium fluoride and the balance of iron, wherein the total amount of impurities is not higher than 2%. The process for preparing the iron-based powder metallurgy bearing material comprises the steps of mixing powder, pressing, sintering, heat treatment and vacuum oil immersion. The iron-based powder metallurgy bearing material provided by the invention has high-strength wear-resisting properties, specifically, the crushing strength of the bearing material ranges from 720 MPa to 780 MPa, the Rockwell hardness of the bearing material ranges from 90 HRB to 110 HRB, the oil length of the bearing material ranges from 13% to 16% and the oiling friction coefficient of the bearing material ranges from 0.08 to 0.09. The material provided by the invention is used as oil cylinder bearings of engineering machinery, such as an excavator and a bulldozer.

Description

[0001] This application is a divisional application with the application number 2013104150592, the application date is September 12, 2013, and the invention name is high-strength wear-resistant iron-based powder metallurgy bearing material and its preparation method. technical field [0002] The invention belongs to the technical field of metal material powder metallurgy, and in particular relates to a high-strength wear-resistant iron-based powder metallurgy bearing material. Background technique [0003] Sliding bearings are commonly used parts in various machinery, and the sliding bearing materials are required to have sufficient compressive strength and fatigue resistance, good anti-friction and wear resistance (small friction coefficient), the function of storing lubricating oil and good running-in performance , Iron-based powder metallurgy materials are the most commonly used bearing materials. According to my country's GB / T-2012 "Sliding Bearing Powder Metallurgy Techni...

Claims

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Application Information

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IPC IPC(8): C22C38/16B22F3/16B22F3/24
Inventor 李其龙徐伟张东孙本松任刚强
Owner 合肥波林新材料股份有限公司
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