Powder metallurgy oil-free lubricating bearing and method for preparing same

Abstract

The invention discloses a powder metallurgy oil-free lubricating bearing and a method for preparing the same. The powder metallurgy oil-free lubricating bearing comprises a shaft body provided with an axial central hole, and the outer surface of the shaft body is provided with an oil storage tank. The preparation method comprises the following steps: (1) evenly mixing Cu-Sn powder and C powder for forming, wherein the weight portion of all components is that: C is 0.5 to 3.0 portion, Cu is 85 to 93 portions and Sn is 5 to 13 portions; (2) controlling the temperature to between 650 and 730 DEG C, and performing sintering; (3) orderly performing finishing and cleaning; (4) performing vacuum oil immersion; and (5) performing deoiling treatment. The product has high precision and good dimension stability. Because the internal diameter tolerance of the product is controlled at 8u, and the axiality of the product is less than 0.05mm, and the matching gap between the product and the shaft is small, so that the friction contact area is small, the rotating efficiency of a fan is improved, the operating noise of the fan is reduced, and the service life of the fan is prolonged.

Description

technical field [0001] The invention relates to a powder metallurgy bearing and a preparation method thereof, in particular to a powder metallurgy oil-free lubricating bearing and a preparation method thereof. Background technique [0002] At present, in the manufacturing process of ordinary bearings, problems such as cracks and inner diameter bending are prone to occur, which directly leads to high scrap rate and low production efficiency of the produced bearings, which is not conducive to mass production of bearings. In addition, due to the large contact area between the shaft core and the bearing when the motor is running, friction occurs, and the shaft core will wear out rapidly. At the same time, the starting current of the motor will also increase, resulting in early burnout of the motor. If lubricating oil is added to the bearing, the lubricating oil will volatilize and crack rapidly under the influence of friction heat at this time, which cannot play a very good effe...

AI Technical Summary

Problems solved by technology

[0002] At present, in the manufacturing process of ordinary bearings, problems such as cracks and inner diameter bending are prone to occur, which directly leads to high scrap rate and low production efficiency of the produced bearings, which is not conducive to the mass production of bearings

In addition, due to the large contact area between the shaft core and the bearing when the motor is running, friction occurs, and the shaft core will wear out rapidly. At the same time, the starting current of the motor will also increase, resulting in early burnout of the motor

If lubricating oil is added to the bearing, the lubricating oil will be quickly volatilized and cracked under the influence of frictional heat at this time, which will not have a good effect

In addition, due to the disadvantages of ordinary bearings, such as easy deformation of the inner diameter and coaxial difference between the upper and lower ends, while reducing the operating efficiency of the motor, it also increases the friction noise during operation.

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