Engineering plastic lubricated bearings generally have a self-lubricating function on their working surfaces. Plastic sliding bearings are generally made of engineering plastics with better performance. Manufacturers of higher quality generally have engineering plastics self-lubricating modification technology. Self-lubrication is enhanced and modified to achieve a certain performance, and then the modified plastic is processed by injection molding to become a self-lubricating plastic bearing. At present, polymer plastic sliding bearings are widely used.
Engineering plastic self-lubricating bearings use carbon steel as the substrate, sintered copper powder layer in the middle, and the surface is rolled with low friction materials mainly composed of PTFE or thermoplastic polymer as the bearing working layer. This material structure has excellent mechanical load carrying capacity. The intermediate copper powder layer not only can transfer the total heat generated during the bearing operation in time, but also improves the bonding strength between the plastic layer and the substrate. The working conditions of PTFE are suitable for completely dry friction, while thermoplastic designs such as POM are suitable for low speed and high load conditions under boundary lubrication conditions.
Engineering plastic self-lubricating bearings have the following 5 characteristics:
1: More wear-resistant than traditional needle roller bearings, longer life and higher reliability.
2: The mass and volume are relatively small, which can save installation space, and can be used to simplify some linkage mechanisms in the operating system, which is conducive to lightweight design.
3：Can reduce mechanism vibration, noise, lubricant pollution and improve working conditions.
4：No need to add grease or only one-time filling. It can be used in places where the overall packaging or disassembly is inconvenient after manufacturing, or in places with small spaces, complicated mechanisms and inconvenient lubrication.
5：The static and dynamic friction coefficients are similar, and they work closely with the bearing seat to ensure the accuracy of the machine.
At present, foreign engineering plastic lubricating bearings are developing rapidly and have a wide range of applications. They have basically reached a mature and stable market environment. At present, China is still in its infancy. Raw materials production, modification, mold development, mechanical equipment, and product applications are all lacking. In developed countries in Europe and the United States, the steel-plastic ratio has reached 4: 6, and Germany has reached 3: 7. Most of the equipment is using engineering plastics to lubricate bearings. Of course, with the new round of in-depth external development and scientific and technological development, the demand for China's engineering plastic lubricating bearings has maintained rapid growth.
