Plastic bearings knowledge

Plastic bearing can be divided as plastic rolling bearing and plastic sliding bearing 2 types at present. The friction of plastic rolling bearing is rolling friction, and the sliding friction of plastic bearing is sliding friction. The magnitude of the rolling friction depends mainly on the manufacturing accuracy, while the friction force of the plastic sliding bearing mainly depends on the material of the sliding surface of the bearing.

The general working face of plastic sliding bearing has the function of self lubrication, and the plastic sliding bearing is usually made of engineering plastics with better performance. The professional manufacturers generally have self lubricating modification technology of engineering plastics, and the self-lubricating and enhanced modification of the engineering plastics through fiber, special lubricants, glass beads and so on. To achieve a certain performance, and then the modified plastic into a self lubricated plastic bearing by injection molding, at present the polymer plastic sliding bearings are widely used.

Plastic sliding bearings have the following characteristics:

1. plastic bearings are all lubricated materials with long service life.

2. No rust phenomenon and corrosion resistance will occur in the use of plastic bearings. Metal bearings are easy to rust and can not be used in chemical fluids.

3. The quality of plastic bearing is lighter than metal, which is more suitable for modern lightweight design trend.

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

5. The plastic bearing has no noise in operation and has a certain vibration absorption function.

6. Plastic sliding bearings are suitable for high and low temperature -200 ~ +250 centi-degrees.

Plastic sliding bearings can not only make the shape of the bushing, but also make plastic linear sliding bearings, but the premise is that the material made must be improved by self lubrication to improve their comprehensive wear resistance. For example, the common plastic linear bearings in the market are the material through the lubricants and the reinforced fiber. Made of process plastic, its wear resistance is excellent.

As the plastic bearing has many advantages compared with the metal sliding bearing, the production of plastic bearing is increasing, and the use of plastic bearings is also continuously extending. Plastic bearings are used from fitness equipment to office equipment and automobile industry.

POM plastic bearing, PP plastic bearing

POM and PA materials have good mechanical strength and wear resistance. It is suitable for making more precise plastic bearings. The working temperature is from -60 to 100 Centi-degrees. The surface strength is high and smooth, and the tensile strength is very high. The good self lubrication and low friction coefficient can be used to keep the traditional advantages of the plastic bearing. Precision and high speed operation. Among them, POM plastic bearings are the most widely used of all plastic bearings. Generally, the internal and external ball materials are POM or PA, and the cage is made of glass fiber reinforced nylon 66 (GRPA66-25). The ball is made of glass balls, stainless steel balls or ceramic balls. This bearing performs well in alkaline environment but is not suitable for running in acid corrosive environment.

Characteristic:

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

2. excellent elasticity and good creep resistance.

3. high heat stability and excellent dimensional stability.

4. good sliding performance, wear-resistant;

5. physiological inertia, suitable for contact with food.

6. strong acid and strong oxidizing agent, poor adhesion to paint

Main uses:

Mechanical and electrical equipment, fitness equipment, food machinery, furniture and decorative building materials

HDPE, PP, and UHMWPE materials have proved to be suitable for a relatively weak acid base cross environment (30%Cucl2 solution and 30% NaoH solution test OK) so it is suitable for most acid / alkali / salt / soluble / oil / gas and seawater corrosion environment. It has the properties of oil free self lubrication, magneto electric insulation, low mechanical strength and easy to deform, so this kind of acid alkali plastic bearing is not suitable for large load and high speed, so it can overcome the shortcomings of such anti acid and alkali plastic bearings. In comparison, the use of UPE material has better strength, low friction properties and low temperature application characteristics (the lowest can reach 150 Centi-degrees), HDPE, PP or UHMWPE are used in the inner and outer materials, and the cage material is HDPE, PP or UHMWPE, and the ball is glass ball, stainless steel ball or ceramic ball. So the comprehensive performance of acid and alkali bearing will be greatly improved.

Characteristic:

1. good corrosion resistance. It can withstand various corrosive medium and organic medium in certain temperature and concentration range.

2. high mechanical strength and high cutting toughness at liquid nitrogen temperature (-196 centi-degrees).

3. good self lubrication, high wear resistance

4. strong resistance to adhesion

5. extremely low water absorbability and excellent electrical insulation

6. good anti high energy radiation performance

Main uses:

Mechanical and electrical equipment, fitness equipment, food machinery, furniture and decorative building materials

PTFE high temperature resistant and corrosion-resistant plastic bearing

PTFE and PI, as new engineering plastics materials, have been proved to be mechanical strength, dimensional stability and high temperature resistance of all known engineering plastics.

PTFE, the long-term use of temperature up to 260 centi-degrees, PI long-term use temperature is up to 300 degrees C, and its excellent corrosion resistance, in the medium strength of acid and alkali corrosion environment can still run freely, so generally used for the manufacture of outer ring materials to choose PTFE or PI, the ball is generally Zro2 or Si3N4 ceramic balls. The disadvantage of precisely running bearings in a relatively harsh environment is that the cost of materials is relatively high because of their high cost.