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Composite metal powder for sintered bearing, and sintered oil retaining bearing

A sintered bearing and composite metal technology, which is applied in the field of composite metal powder for sintered bearings and oil-impregnated sintered bearings, can solve the problems of increasing prices, reducing the strength of sintered bodies, increasing costs, etc. Effect of stabilizing sliding performance

Inactive Publication Date: 2002-05-29
PORITE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] According to the above-mentioned Special Publication No. 55-38019, since the copper covering more than 30% is a necessary condition, a large amount of high-priced copper must be used, which has to increase the cost. The effect of the base is not fully exerted, so that the sliding performance as a bearing is poor, which is very disadvantageous
On the other hand, as disclosed in JP-A-3-166303, since a foil-shaped powder formed of the same metal or alloyed metal as the coating layer is added, the process is complicated and stable characteristics cannot be obtained, which is also disadvantageous. of
In particular, these disclosed high-performance bearing materials lack consideration for air permeability. Even after running-in, the oil pressure will escape from the oil hole on the sliding surface of the bearing. As an ideal oil-impregnated sintered bearing, it is difficult to obtain sliding close to fluid lubrication status, which is also very unfavorable
[0005] Regarding the above-mentioned situation of suppressing air permeability, although it is discussed in Japanese Patent Publication No. 7-54126, due to the addition of copper-graphite composite powder, the price of the powder has to become very high, and the sintered body The strength is reduced, which is very unfavorable
However, the above-mentioned JP-A-8-20836 discloses that 30 to 60% of copper-coated iron powder is used, and the process of sintering in a zinc atmosphere to make it adsorb zinc becomes a necessary condition, so even if excellent characteristics are obtained, it must be A large amount of copper is used, and since sintering in a zinc atmosphere is required, the number of man-hours increases rapidly, and the price has to be raised anyway.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The specific embodiments of the present invention described above will be described together with their comparative examples. First, the iron powder used by the present inventors has a copper coating of 20% by weight, a particle size of -80 mesh, and a specific surface area of ​​573 cm. 2 / g, it is processed into a cylindrical pressed powder with an inner diameter of 6mm, an outer diameter of 12mm, and a height of 4mm as an embodiment and a comparative example, and is sintered in ammonia decomposition gas at 1000°C for 30 minutes.

[0017] The obtained sintered bodies were subjected to normal shape finishing and oil immersion treatment to produce bearing bodies with an oil content of 20% by volume, and these bearing bodies were subjected to a bearing test under the following conditions.

[0018] Shaft material: S45C raw material

[0019] Load: 0.81N / mm 2 , 1.63N / mm 2 , 3.26N / mm 2

[0020] Sliding speed: 52.9m / min

[0021] Impregnated Oil: Mineral Oil 32cst

[0022...

Embodiment 3

[0031] Also to the powder of Example 1, 1.8% by weight of tin powder is added, under the same conditions as in Example 1 above, a sintered body of the same shape is made, sintered at a sintering temperature of 860° C., and then this sintered body The bearing characteristics and oil content are shown in Tables 1 and 2 above.

Embodiment 4

[0033] 0.5% by weight of graphite powder was added to the powder of Example 1, and under the same conditions as in Example 1, a sintered body of the same shape was produced. The bearing properties and oil content of this sintered body are listed in Tables 1 and 2 above.

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Abstract

Composite metal powder for sintered bearings, prepared by coating surface layers of particles of iron powder with 10 wt.% to less than 30 wt.% of copper based on the iron powder so that the particle size of the coated iron powder is at most 80 meshes, the content of the powder of at most 350 meshes is at most 30%, and the specific surface area of the powder is 450-750 cm<SP>2< / SP> / g according to the subsieve sizer method. This metal powder can provide an oil-retaining bearing for motors, which is capable of providing a low gas-permeability without decreasing the oil content and which has a low and constant coefficient of friction, a high corrosion resistance, a high adaptability and a high durability, readily at a low cost.

Description

technical field [0001] The present invention relates to a composite metal powder for sintered bearings and oil-containing sintered bearings. This kind of bearings can be used as bearings for motors, etc., which is not only simple but also inexpensive, and can obtain low air permeability even without reducing the oil content, and has little friction and maintains In a constant state, it is an oil-impregnated bearing with strong corrosion resistance, excellent running-in performance and high durability. Background technique [0002] For the sintered body for bearings made of copper-coated iron powder, in No. 55-38019, it is proposed to use 30-60% copper-coated iron powder. Foil-like powder formed by layering the same metal or alloying metal. [0003] Japanese Patent Publication No. 7-54126 proposes that in order to improve the properties of sintered oil-impregnated bearings, it is considered necessary to lower the air permeability and add copper-graphite composite powder. In...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/17C22C33/02F16C33/12F16C33/14
CPCF16C33/12C22C33/0278B22F1/025F16C33/14F16C33/121F16C2220/20F16C2223/04F16C2223/30B22F1/17
Inventor 成泽靖竹崎阳二
Owner PORITE
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