Oil impregnated bearing of powder metallurgy with ultra-long service life and manufacturing method thereof

Abstract

The invention discloses an oil impregnated bearing of powder metallurgy with an ultra-long service life and a manufacturing method thereof. The bearing comprises the components by weight percent: 7% to 11% of Sn, 0.2% to 1.0% of P, 2% to 6% of Cr, 2% to 6% of MoS2, the balance of Cu and unavoidable impurities. The bearing is prepared by the following method of treating the powder of the components by mixing, low-temperature diffusion, pressing formation, sintering, shaping and oil immersion into the bearing according to a certain proportion. In the bearing, MoS2 powder is added to be used as a solid lubricant, and phosphorus is used as a hardening agent for a Cu-Sn base body, which ensures that Cu-Sn alloy is distributed at a low-temperature state to be more easily combined and the alloy is distributed more evenly by the treatment of mixing and low-temperature diffusion; meanwhile, the phosphorus is beneficial to grain refinement of the alloy; the surface of a sintering body has spongy fine through holes with the porosity communication rate reaching more than 95%; the friction of the inner diameter surface of the bearing is reduced during operation; the sliding noise is low; Cr is added to enhance the strength of the base body; therefore, the wearing resistance is enhanced in the operation of the bearing and the service life can exceed 30,000 hours.

Description

technical field [0001] The invention relates to a sintered oil-impregnated bearing and a manufacturing method thereof, in particular to a powder metallurgy ultra-long-life oil-impregnated bearing and a manufacturing method thereof. technical background [0002] With the development of the powder metallurgy industry, the application fields of powder metallurgy oil-impregnated bearings are constantly expanding, especially in the fields of micro-motors, office equipment, household appliances (air conditioners, refrigerators, etc.) used in automobiles, etc., which require bearings to have low noise and long life. . However, the current long-life powder metallurgy oil-impregnated bearings are usually improved by adding Pb to improve friction reduction and prolong service life. However, this method does not meet environmental protection requirements, and the bearings manufactured by this method have poor performance. The service life of the bearing cannot meet the requirements of...

AI Technical Summary

Problems solved by technology

However, the current long-life powder metallurgy oil-impregnated bearings are usually improved by adding Pb to improve friction reduction and prolong service life. However, this method does not meet environmental protection requirements, and the bearings manufactured by this method h...

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