Manufacturing method of oil bearing used at temperature over 250 DEG C

Abstract

The invention discloses a manufacturing method of an oil bearing used at a temperature over 250 DEG C, comprising the following manufacturing steps: powder mixing, powder compacting, high temperature sintering, bearing coining, cleaning, drying and oil immersion. The minitype oil bearing manufactured by the method can completely satisfy the working requirement under the condition of over 250 DEG C, has stable revolving speed within 10,000-15,000rpm, has the relative speed variation no more than 30% and the relative current variation no more than 10% when working at 250 DEG C and 40 DEG C, has low noise and maintained on / off test length as long as over 150h, and prevents the problems of large noise, abraded inner hole and excessive revolving speed or locking due to fuel starvation of the bearing.

Description

technical field [0001] The invention relates to a method for manufacturing an oil-impregnated bearing. Background technique [0002] Oil-impregnated bearings are currently using the powder metallurgy production process, which is to manufacture finished products after mixing metal powders, pressing, sintering, precision pressing, and oil immersion. For the manufacture of oil-impregnated bearings with a unit weight of less than 0.1g, the requirements for the ratio of raw materials, the accuracy of equipment, and the selection of lubricating oil are quite high. In the actual mass production process, there is relatively little room for choice. Therefore, in large-scale production, it is often encountered that the powder cannot be completely filled, especially if some additives are added to the metal material, this phenomenon is more obvious, resulting in a large difference in bearing density, unstable product size, or Poor product appearance due to poor product formability. At...

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Problems solved by technology

Therefore, in large-scale production, it is often encountered that the powder cannot be completely filled, especially if some additives are added to the metal material, this phenomenon is more obvious, resulting in a large difference in bearing density, unstable product size, or Poor product appearance due to poor product formability

At the same time, this kind of bearing is used on the micro motor, the starting current is small, the starting voltage is small, so the choice of lubricating oil must choose high-quality low-viscosity oil, otherwise the motor will not start

Therefore, this kind of bearing can only be used at -20°C-80°C. Once the working temperature exceeds this temperature, the bearing will easily cause serious problems such as motor lockup, noise and speed drop.

At present, there is no oil-impregnated bearing that can be used at high temperatures of 250°C and above

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