Ultrahigh rotating speed oil bearing for powder metallurgy and manufacturing method thereof

Abstract

The invention discloses an ultrahigh rotating speed oil bearing for powder metallurgy and a manufacturing method thereof. The bearing comprises the following components in percentage by weight: 27-54% of Cu, 3-6% of Sn, 2.2-6% of MoS, 0.2-2% of La or Ce and the balance of Fe and inevitable impurities. The bearing is manufactured by carrying out processes of mixing, low-temperature diffusion, press forming, sintering, reshaping and oil immersion treatment on mixture formed by proportionally mixing the powders. Solid lubricant and rare earth which are used as an active catalyst and an enhancer for a basis material of the bearing are added to the bearing, thereby being benefical to grain refinement; and weeny through holes are generated on a sintering body, and the connectivity rate is more than 95 percent. When the bearing rotates at a high speed, an oil film is formed on the inner wall of the bearing by the lubricating oil, and the bearing is applicable to an ultrahigh rotating speed motor with the rotating speed being more than 34000 rpm.

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-high-speed oil-impregnated bearing and a manufacturing method thereof. technical background [0002] The micro-motor bearings used in various machinery and equipment require good anti-friction performance, and require low mechanical sliding friction noise when the rotating shaft rotates at high speed in the bearing. At present, the oil-impregnated bearings are required to reach the specified PV value when the motors with ultra-high speeds (34,000 rpm or more) start running. Under the state of boundary lubrication, conventional bearings will produce a lot of wear when they start running. Matrix strengthening is often used to improve wear resistance, such as adding phosphorus and adding solid lubricants to improve boundary lubrication. If a large amount of fine graphite powder is added as a solid lubricant, the air p...

AI Technical Summary

Problems solved by technology

If a large amount of fine graphite powder is added as a solid lubricant, the air permeability of the sintered oil-impregnated bearing will be greatly reduced, thereby deteriorating the circulation of lubricating oil in the bearing

In addition, the graphite powder mixed in the lubricating oil may also increase the apparent viscosity of the oil, which will increase the friction coefficient after it has been converted to fluid lubrication, increase the temperature of the bearing, and cause serious wear and tear when the bearing is running at ultra-high speed. Failure, or even the phenomenon of shaft holding

Images