It is especially suitable for rotating motion under heavy load and low speed, rocking motion and parts that are often opened and closed under load and are not easy to form fluid lubrication. It can be used for a long time without oil maintenance under boundary lubrication conditions, and the service life of bearings can be prolonged by oil filling in the process. The plastic layer on the surface of bearings is assembled in the shaft sleeve. A certain amount of allowance can be left in the die processing, which can be processed by itself after pressing into the hole to achieve better assembly size.
At present, it is mainly used in metallurgical machinery, mining machinery, water conservancy machinery, automobile chassis, construction machinery, agricultural machinery, rolling machinery, etc.
1. The mixture of modified polyformaldehyde (POM) and lead is 0.3~0.5mm, which has high wear resistance and low friction coefficient even in the case of instantaneous oil shortage. Oil storage pits with helical angle arranged regularly on the bearing surface must be coated with lubricating grease when assembling.
2. Copper powder layer is 0.2-0.3 mm, which has good load-bearing capacity and wear resistance. Good thermal conductivity can transfer heat generated during the operation of bearings in time. Composite materials can infiltrate into the gap of copper powders and improve the bonding strength.
3. Low carbon steel 0.4~2.2 mm, improve bearing capacity and heat transfer function.
4. Copper/tin plating, copper plating 0.008mm, tin plating 0.005mm, so that bearings have good corrosion resistance.