Selection and Characteristics of Composite Sliding Bearings
In order to solve the mechanical equipment in the high temperature, low speed, heavy load,
dust, water shower and shock vibration lubrication, the choice of composite sliding bearings.
1、The structure of composite sliding bearings in the bearing matrix metal friction surface
development of the orderly size of the appropriate holes, and embedded in molybdenum disulfide,
graphite and other synthetic self-lubricating slider made in the metal sets, made of Composite
bearings, solid lubricant friction area of 25%-65%. The solid self-lubricating block can work
normally at a high temperature of 280 ℃. But because of its low mechanical strength, weak
carrying capacity, easy to produce deformation, it is embedded in the metal hole slot can inhibit
this shortcoming, the formation of the metal part from the bearing role, self-lubricating block
from the lubrication. The lubrication mechanism of this composite sliding bearing is in the shaft
and sleeve sliding friction process, a part of the molecular self-lubricating material
transferred to the metal surface of the shaft, filling the tiny uneven, and the formation of a
more stable solid lubricating film. Resulting in solid lubricating film between the grinding, to
prevent the shaft and the sleeve of the adhesive wear. This combination of rationality combines
the complementary advantages of copper alloy and non-metallic abrasive materials, and is
particularly suitable for oil-free, high temperature, high load, low speed, anti-fouling,
corrosion, strong radiation environment, and in water or other solution infiltration and simply
can not add grease to the special conditions of use.
2、Self-lubricating block area than the proportion of self-lubricating block surface area
with the operating speed, pressure strength, low speed; pressure strength, the area occupied by
the metal should be larger. Such as grasping the ingot car travel roller bearing self-lubricating
block area of about 25%, pull the spindle shaft bearing lubrication to be sufficient, the pressure
is not strong, self-lubricating block area about 65%.
3、The technical requirements of the bushing material should be made of alloy copper alloy,
bushing to have a higher hardness, generally have to heat treatment, the hardness not less
4、Self-lubricating block geometry and mosaic requirements. Self-lubricating block shape
is cylindrical and rectangular two, self-lubricating according to the size of the area can be used cylindrical, and vice versa can be rectangular. No matter what kind of shape must be embedded in
a solid, to prevent falling off in operation.
5、The balance between the bushing and the shaft.The self-lubricating block has a linear
expansion coefficient of about 10 times that of steel. In order to adapt to the bearing
temperature changes, the gap between the shaft and the bushing from the original metal parts with
four (D4 / DC4) 0.032 ~ 0.15MM, increased to 0.45 ~ 0.5MM. Self-lubricating block on the side of
the friction protruding bushing metal 0.2 ~ 0.4MM. This will be in the bearing running the initial
run-in period to be fully lubricated, reducing the power drag power consumption.