High-performance powder metallurgy oil-impregnated bearing and manufacturing method thereof
A powder metallurgy and manufacturing method technology, applied in the field of high-performance powder metallurgy oil-impregnated bearings and their manufacturing, can solve the problems of environmental pollution, low bonding strength, excessive wear, etc., to improve the sintering performance, reduce the sintering temperature, and reduce the formation effect of temperature
Active Publication Date: 2016-01-20
COB PRECISION PARTS
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Problems solved by technology
However, since electroplating is an environmentally polluting process, its use is becoming more and more restricted
At the same time, the bonding strength between the steel back and the copper alloy layer of the product manufactured by this process is still relatively low, and delamination will still occur under the condition of a large impact force; in addition, the product’s Relatively low hardness, excessive wear will still occur under heavy load conditions
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Embodiment Construction
[0025] like figure 1 As shown, the high-performance powder metallurgy oil-impregnated bearing of the present invention is formed by sintering and compounding a steel sleeve 1 and a copper alloy layer 2 . The copper alloy layer 2 is formed by pressing powder metallurgy copper powder, and it is placed inside the steel sleeve 1 . The inner wall of the copper alloy layer 2 is provided with an oil groove 3 (or an oil hole or other structure that is beneficial to lubrication). The oil-impregnated bearing of the present invention is manufactured by the following three methods of embodiment (the process steps of the three embodiments are the same, but the composition ratio of the copper alloy powder is different):
[0026] 1. Mixing: Put the powder into the mixing tank according to the ratio in the table below for mixing, and the mixing time is 2 hours.
[0027] Copper alloy powder composition ratio table (unit: weight content %)
[0028]
Embodiment one Embodiment t...
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Abstract
The invention discloses a high-performance powder metallurgy oil-containing bearing and a manufacturing method thereof. The high-performance powder metallurgy oil-containing bearing comprises a steel sleeve on the outer layer and a powder metallurgy copper powder layer on the inner layer, and the powder metallurgy copper powder layer is composed of, by weight, 6-14% of Al powder, 4-12% of Sn powder, 1-5% of alloy enhancing elements, 1-3% of a solid lubricant, 0.5-2% of paraffin and the rest copper powder. The manufacturing method includes the processing steps of powder stirring, blank pressing, pretreating, washing, press fitting, sintering, machining and vacuum oil immersion. The high-performance powder metallurgy oil-containing bearing has good wear-resistant and lubricating performance, hardness of the copper powder alloy layer can be more than or equal to 60HRB, and adhesion between the alloy layer and a steel back layer can be effectively guaranteed.
Description
technical field [0001] The invention relates to a sliding bearing and a manufacturing method thereof, in particular to a high-performance powder metallurgy oil-impregnated bearing and a manufacturing method thereof. technical background [0002] In the field of self-lubricating bearings, copper alloy bearings have been widely used due to their better friction properties. However, with the continuous reduction of the total amount of metal resources, the price of copper materials continues to rise, which has brought greater pressure on the cost of enterprises; The product puts forward higher requirements, not only to have better friction resistance, but also to have higher strength to broaden the application field. For this reason, a powder metallurgy copper alloy product has gradually entered people's field of vision. It has a high material utilization rate, and at the same time, its high porosity can play an effective role in oil storage, which can greatly reduce such Impr...
Claims
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IPC IPC(8): B22F7/04B22F1/00B22F3/16B22F3/26
Inventor 张国强
Owner COB PRECISION PARTS