POM, PP, PE and PTFE Plastic Bearings

Currently plastic bearings can generally be divided into Plastic rolling bearings and plastic plain bearings.

In recent years, engineering plastic products with its excellent performance to obtain more and more widely used. Engineering plastics have a broad application prospect in bearings, plastic bearings are welcomed by more and more users.

This article describes the working principle, characteristics and main uses of plastic bearings.

1

Principle of operation

The working principle of plastic rolling bearings and plastic plain bearings can be distinguished by their names.

Plastic rolling bearings work when the friction is rolling friction, and plastic plain bearings work when the sliding friction;

The size of the rolling friction mainly depends on the manufacturing precision, while the size of the friction of the plastic plain bearing mainly depends on the material of the sliding surface of the bearing.

2

Classification

01

POM plastic bearing, PA plastic bearing

POM and PA materials have good mechanical strength and wear resistance, suitable for making more precise plastic bearings, working temperature from -60 ℃ to 100 ℃, high surface strength and smooth, basically no tension, its good self-lubricating properties and coefficient of friction, in maintaining the traditional advantages of plastic bearings based on the application of precision and higher speed operation.

One of the POM plastic bearings is the most widely used of all plastic bearings, generally inside and outside the ball material using POM or PA, cage using glass fiber reinforced nylon 66 (GRPA66-25). The balls are glass, stainless steel or ceramic. These bearings perform well in alkaline environments but are not suitable for operation in acidic corrosive environments.

Characteristics

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

2. Excellent elasticity, good creep resistance;

3. High thermal stability and very good dimensional stability;

4. Good sliding properties and wear resistance;

5. Physiologically inert, suitable for contact with food;

6. Intolerance of strong acids and oxidizing agents, poor adhesion to paints

Main applications

Electromechanical equipment, fitness equipment, food machinery, furniture and decorative building materials.

02

hdpe, PP, UPE plastic bearings

HDPE, PP, UPE materials have been proved to be able to be used in relatively weak acid and alkali cross environment (30% Cucl2 solution and 30% NaoH solution test OK), so it is suitable for most of the acid / alkali / salt / solvents / oil / gas and seawater corrosive environment. With general plastic bearings of oil-free self-lubricating, anti-magnetic and electrical insulation properties, but the mechanical strength is low, easy to deform, so such anti-acid and alkali plastic bearings are not suitable for larger loads and higher speeds, in order to overcome the shortcomings of such anti-acid and alkali plastic bearings.

In contrast, the use of UPE material has better strength, low friction characteristics and low-temperature applications (as low as -150 ° C), the general inner and outer ring material using HDPE, PP or UPE, the material used HDPE, PP or UPE, the ball for the glass, stainless steel balls or ceramic balls. In this way, the comprehensive performance of acid and alkali resistant bearings will be greatly improved.

Characteristics

1. Good corrosion resistance, in a certain temperature and concentration range can be resistant to a variety of corrosive media and organic media

2. High mechanical strength, cut in liquid nitrogen temperature (-196 ℃) to maintain high toughness

3. Good self-lubrication, high wear resistance

4. Strong anti-adhesion ability

5. Extremely low water absorption, excellent electrical insulation properties

6. Good resistance to high energy radiation.

Main applications

Electromechanical equipment, fitness equipment, food machinery, furniture and decorative building materials.

03

CSB-EPB Series Plastic Plain Bearing

Plastic plain bearings generally have self-lubricating function on the working surface, plastic plain bearings are generally made of engineering plastics with better performance.

More professional manufacturers generally have engineering plastics self-lubricating modification technology, through the fiber, special lubricants, glass beads and so on the engineering plastics for self-lubricating enhancement of the modification so that it reaches a certain performance, and then use the modified plastic through the injection molding process into self-lubricating plastic bearings.

At present, polymer plastic plain bearings are widely used is CSB-EPB series plastic plain bearings.

Characteristics

1.The whole plastic bearing is lubricated material with long service life;

2.Plastic bearings do not rust and are corrosion-resistant, while metal bearings are prone to rust and cannot be used in chemical fluids;

3, Plastic bearings are lighter than metal, which is more suitable for the modern trend of lightweight design;

4, Plastic bearings manufacturing costs are lower than metal; plastic bearings are injection molding processed into more suitable for mass production;

5, Plastic bearings in operation without any noise, has a certain vibration absorption function;

6, Plastic plain bearings are suitable for high and low temperature work -200 ~ +250 degrees;

Plastic plain bearings can not only be made into the shape of the sleeve, can also be made into plastic linear plain bearings, but the premise is made of materials must be self-lubricating improvement to improve its comprehensive wear resistance.

For example, the current market common CSB-LIN plastic linear bearings is the material through the lubricant as well as reinforced fiber modified engineering plastics, its wear resistance is very excellent.

Main application

Due to the plastic plain bearings than metal class plain bearings there are many advantages, at present the production of plastic bearings is increasingly expanding, the use of plastic bearings are also in the extension of occasions, from fitness equipment to office equipment and the automobile industry and so on are used in the plastic bearings, at present in the highway driving cars do not not use plastic bearings.

04

PTFE high temperature and corrosion resistant plastic bearings

PTFE and PI as an emerging engineering plastics materials, is proved to be all known engineering plastics mechanical strength dimensional stability and high temperature performance is better, of which PTFE long-term use temperature up to 260 ℃.

PI long-term use temperature is as high as 300 ℃, and its excellent corrosion resistance, in the medium strength of acid and alkali corrosive environment can still run freely, it is generally used for the production of the need for the outer ring material selection of PTFE or PI, the ball is generally Zro2 or Si3N4 ceramic ball.

In the more severe environment of precision running bearings, the disadvantage is that the material itself is more expensive, so the use of higher costs.

3

Current status

At present, the development of plastic bearings abroad is very fast, the application range is wider. Plastic bearings in our country is still in its infancy, in the production of raw materials, product applications are relatively lack of.

According to incomplete statistics, in the past five years, the domestic general PC, POM, PA, thermoplastic resins, modified polyphenylene ether and other five engineering plastics and market demand has been to maintain a high growth rate of 30.3%, while China's plastic bearings with engineering plastics are mainly dependent on imports.

4

Prospect

In recent years, engineering plastic products with its excellent performance to obtain more and more widely used. Engineering plastics in the bearing has a broad application prospects, plastic bearings are welcomed by more and more users.

As engineering plastics have excellent self-lubricating, wear-resistant, low friction and special anti-seize characteristics, even in the case of poor lubrication conditions can work normally, and therefore its use as bearing materials is very ideal. Therefore, for the relevant plastics enterprises, to seize the market opportunities, the development of related plastic bearing products, its market prospects are very great.