V Currently used plastic bearings can generally be divided into plastic rolling bearings and plastic plain bearings. In recent years, engineering plastic products have been increasingly used due to their superior performance. Engineering plastics have a wide range of applications in bearings, and plastic bearings are being welcomed by more and more users. How it works

The working principles of plastic rolling bearings and plastic plain bearings can be distinguished by their names, friction that occurs when plastic rolling bearings work is called rolling friction, and friction occurs when plastic plain bearings work. work - sliding friction; The amount of rolling friction mainly depends on manufacturing precision; while friction of plastic plain bearing is mainly dependent on material of sliding surface of bearing.

Categories

1. CSB-EPB series plastic plain bearing

Plastic plain bearings usually have a self-lubricating function on running surface; plastic plain bearings are generally made from better performing engineering plastics; more professional manufacturers usually use self-lubricating self-lubricating modified lubrication technologies, using fibers, special lubricants, glass balls, etc., to carry out self-lubricating modification of engineering plastics to achieve certain characteristics, and then use modified plastics to process self-lubricating plastic bearings through injection molding under pressure. Currently, polymer plastic plain bearings are widely used as CSB-EPB series plastic plain bearings.

CSB-EPB series plastic plain bearings have following features:

1. Plastic bearings are made of lubricants and have a long service life;

2. Plastic bearings do not rust and resist corrosion during use, while metal bearings are prone to rust and cannot be used in chemical liquids;

3. Plastic bearings are lighter than metal bearings, which is more suitable for modern lightweight design trends;

4. The manufacturing cost of plastic bearings is lower than that of metal bearings, plastic bearings are processed by injection molding and are more suitable for mass production;

5. The plastic bearing does not make noise during operation and has a certain vibration-absorbing function;

6. Plastic plain bearings are suitable for high and low temperatures -200～+250 degrees;

Plastic plain bearings can not only be made into a shaft sleeve, but can also be made into plastic linear plain bearings, but premise is that material must be self-lubricating. to improve its comprehensive wear resistance characteristics.

For example, CSB-LIN plastic linear bearings common on market are made of engineering plastics modified with lubricants and fiber reinforced and have very good wear resistance;

With many advantages of plastic plain bearings over metal plain bearings, output of plastic bearings is increasing day by day, and use of plastic bearings is also expanding, from fitness equipment to office equipment and automotive industry. Apart from plastic bearings, there is currently no vehicle on road that does not use plastic bearings.

2. POM plastic bearings, PP plastic bearings

POM and PA materials have good mechanical strength and wear resistance and are suitable for making relatively precise plastic bearings. The working temperature is from -60°C to 100°C, and surface strength is high and smooth. Basically, there will be no stress, and its good self-lubrication performance and friction coefficient can be applied to precision and high-speed operation based on maintaining traditional advantages of plastic bearings.

POM plastic bearings are most commonly used. As a rule, inner and outer balls are made of POM or PA, and cage is made of glass fiber reinforced nylon 66 (GRPA66). -25). The balls are glass balls, stainless steel balls, or ceramic balls that work well in alkaline environments, but are not suitable for acidic, corrosive environments.

Features:

1. High rigidity, high hardness, high impact strength even at low temperature;

2. Excellent elasticity, good creep resistance;

3. High thermal stability and very good dimensional stability;

4. Good sliding characteristics and wear resistance;

5. Physiologically inert, suitable for contact with food;

6. Not resistant to strong acids and strong oxidizing agents, poor adhesion to paint

Main goal:

Mechanical and electrical equipment, fitness equipment, food equipment, furniture and finishing building materials

3 plastic bearings made of HDPE, PP, UPE

HDPE, PP and UPE materials have been proven to be able to be used in relatively weak acid-base environments (30% Cucl2 solution and 30% NaoH solution are tested normally), so they are suitable for most acids/alkalis. /salt/solvent economy/oil/gas and corrosive sea water environment. It has oil-free self-lubricating, anti-magnetic and electrical insulation properties of ordinary plastic bearings, but its mechanical strength is low and it is easily deformed. Disadvantages of alkaline plastic bearings.

In comparison, UPE material has best strength, low friction and low temperature performance (minimum -150°C). Generally, materials of inner and outer rings are HDPE, PP or UPE and materials are HDPE, PP or UPE, balls are glass balls, stainless steel balls or ceramic balls. Thus, the comprehensive performance of acid and alkali resistant bearings will be greatly improved.

Features:

1. Good corrosion resistance, withstands various aggressive media and organic media in a certain range of temperatures and concentrations

2. High mechanical strength, can maintain high impact strength at liquid nitrogen temperature (-196°C)

3. Good self-lubrication, high wear resistance

4. High release ability

5. Very low water absorption, excellent electrical insulation

6. Good resistance to high energy radiation

Main goal:

Mechanical and electrical equipment, fitness equipment, food equipment, furniture and finishing building materials

4. High temperature and corrosion resistant PTFE plastic bearing

PTFE and PI, as new engineering plastics, proved to be best of all known engineering plastics in terms of mechanical strength, dimensional stability and high temperature resistance, among which PTFE has a long-term use temperature of 260°CTemperature long-term use, PI reaches 300°C, and it has excellent corrosion resistance. It can work freely in medium acid-base corrosion environment. Therefore, it is usually used in production of PTFE or PI for material of outer ring, and ball is usually made of Zro2 ceramic balls or Si3N4. The disadvantage of bearings that operate in harsh conditions is high cost of use, since material itself is relatively expensive.

Current status

At present, foreign plastic bearings are developing very quickly and have a wide range of applications. However, plastic bearings are still in their infancy in our country, and they are relatively imperfect in raw material production and product application. According to incomplete statistics from relevant parties, in past five years, the five main engineering plastics commonly used in China, including polycarbonate, polyoxymethylene, polyamide, thermoplastic resin and modified polyphenylene ether, and market demand has maintained rapid growth. 30.3%. while engineering plastics for plastic bearings in my country are mainly dependent on imports.

Foreground

In recent years, engineering plastic products have become widespread due to their excellent performance. Engineering plastics have a wide range of applications in bearings, and plastic bearings are being welcomed by more and more users.

Because engineering plastics have excellent self-lubricating properties, wear resistance, low friction and special extreme pressure properties, they can perform well even under poor lubrication conditions, so they are ideal for bearing materials. Therefore, for relevant plastic enterprises, if they seize market opportunities and develop corresponding plastic bearings, market prospects will be very huge.

Note. This article is taken from public account Plastic Price Today (ID: jinrisujia)