High-performance iron-based powder metallurgy oil-containing self-lubricating bearing and production process thereof

Abstract

The invention discloses a high-performance iron-based powder metallurgy oil-containing self-lubricating bearing and a production process thereof, aiming to provide a bearing which is suitable for rotating, swinging and linear reciprocating motion under the conditions of high bearing and low speed and is also suitable for places which can not be reached through traditional lubrication or are forbidden to use. The high-performance iron-based powder metallurgy oil-containing self-lubricating bearing is in a shaft sleeve shape and is characterized by comprising the following raw materials in percentage by weight: 18-22 percent of copper powder, 1-4.8 percent of aluminum powder, 0.6-1 percent of graphite, 1-5 percent of hard particle, 1-5 percent of zinc stearate and the balance of iron powder. The high-performance iron-based powder metallurgy oil-containing self-lubricating bearing sequentially comprises the following making process routes according to the raw material composition: mixing the raw materials, pressing into shaft sleeve-shaped blank, vacuum sintering, carburizing, quenching, turning to be in a required geometric size, and carrying out vacuum oil immersion to make a finished product. The high-performance iron-based powder metallurgy oil-containing self-lubricating bearing is superior to a traditional powder metallurgy bearing and a self-lubricating bearing with high force brass embedding graphite in aspects of both the mechanical property and the friction and wear property and also has obvious advantages on the manufacture cost of the product.

Description

technical field [0001] The invention relates to a self-lubricating bearing of a new material, in particular to a high-performance iron-based powder metallurgy oil-containing self-lubricating bearing and its production process. Background technique [0002] Powder metallurgy oil-impregnated bearings have the advantages of low noise, small size, and cheap price due to the porous metal oil-impregnated bearings. At the same time, they also have the characteristics of self-lubrication, that is, they can be used for a long time after one dip in oil, which brings great convenience to users. Oil-impregnated bearings are lubricated through the following process, that is, when the shaft rotates, due to the effect of vacuum, the lubricating oil in the bearing pores expands due to the heat generated by the friction of the sliding surface and seeps into the bearing. On the working surface, when the rotational speed of the shaft reaches a certain value and the power of the oil film formed...

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Problems solved by technology

Due to the low strength of powder metallurgy oil-impregnated bearings, especially the low crushing strength, they cannot bear heavy loads. Therefore, traditional powder metallurgy bearings cannot meet the actual use requirements.

At present, high-strength brass alloy bushings are generally used as the matrix, and then self-lubricating bearings composed of graphite particles are inlaid around the bushings. However, this kind of self-lubricating bearings has high material costs, complicated manufacturing processes, and low production efficiency. The existence and processing of graphite holes cause mechanical strength damage, resulting in poor impact resistance and other shortcomings, and because of the blind area in the arrangement of solid lubricants, the boundary lubrication caused by insufficient self-lubrication, these weaknesses make the load-carrying capacity drop

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