how the graphite lubricant works for oilless bearing

How The Graphite Lubricant Works For Oilless Bearing， The bushing with self-lubricating system doesnneed any hand lubrication, the machine usage life hence is improved.

How to inlay the graphite particles of the graphite copper sleeve?

Roughly machine the copper sleeve, and then drill holes according to the size of the graphite particles. After the graphite particles are fully embedded, then finish processing.

Working principle of graphite copper sleeve:

General solid lubricants account for 20-30% of the friction surface area, the lubrication principle of graphite copper sleeve self-lubricating bearings is that in the sliding friction process of shaft and bearing, part of the graphite particles transfer to the friction surface of shaft and bearing, forming a layer of stable solid lubrication diaphragm, to prevent the direct adhesion wear of shaft and bearing.

This reasonable combination integrates the respective performance advantages of metal alloy and non-metal wear reducing materials to complement each other, that is, the high bearing capacity of metal is obtained, and the lubrication performance of wear reducing materials is obtained. Therefore, it is especially suitable for no refueling, less refueling, high temperature, high load or water environment.

Graphite copper sleeve, also known as self-lubricating bearing, is a self-lubricating product that develops orderly and appropriate holes on the friction surface of copper sleeve as a metal matrix, and inserts graphite or molybdenum disulfide as a solid lubricant. At present, the graphite copper sleeve has been widely used in engineering machinery, metallurgical machinery, mining machinery, locomotive support, steel rolling equipment, shipbuilding machinery, mold equipment, textile machinery, gas turbine and other low-speed heavy load, high-speed light load and other occasions.

The best method for inlaying graphite column in oil-free self-lubricating bearing

1, high quality matrix material, copper based brass guide plate guide sleeve is used by continuous casting and extrusion rolling of high strength brass material, compact structure, Sn, Ni, Pb, S and other impurities are very few, even less than 0.1%, hardness is more than HB200, to ensure excellent wear resistance.

2, the selection of high quality natural graphite, the use of advanced powder extrusion sintering technology, make the graphite column structure uniform, compact standard, in addition to self-lubrication, its own loss is very small, fully ensure that the lubricating oil content between the organization is sufficient, make the guide plate guide sleeve matrix wear degree is reduced, effectively prolong the service life.

3, vacuum leaching oil technology, the use of vacuum oil immersion technology and fully guarantee the graphite column any gap between the organization are immersed in the saturated oil, so, after the matrix from the relative friction heat, oil molecules volume expansion, from seeping between graphite column group to the substrate surface, at the same time, the lower substrate temperature at the moment of and achieve ideal self lubricating effect.

4, graphite hole diameter, under the premise of ensuring sufficient matrix stiffness and strength, the diameter of graphite hole drilling is relatively small, so that the arrangement of graphite column on the matrix is relatively dense, the lubricating oil content after vacuum immersion is relatively more saturated, and the lubrication effect is better.

5, the depth of graphite hole, on the premise of ensuring enough matrix stiffness, strength, graphite hole drilling deep enough (about 7mm, usually 4 ~ 5mm), vacuum oil immersion after more lubricating oil content, lubrication effect is better.

6, graphite hole “lap edge”, in the self-lubricating guide plate, guide sleeve self-lubrication surface, the most edge of the graphite hole from the edge of the matrix.