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 

than HRC45.


         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.