news

What are the materials used to make radial bearings?

 

Radial bearings, also known as radial bearings, are a type of bearing that is mainly used to bear radial loads. The nominal pressure angle is usually between 0 and 45. Radial ball bearings are often used in high-speed operation occasions and are composed of precision balls, cages, inner and outer rings, etc. This kind of bearing has been widely used in machinery industry, automobiles, cement mines, chemical industry and electrical appliances and other fields.

 

In order to meet the working capacity requirements of radial bearings, the materials used to manufacture radial bearings must have strong load capacity, embeddedness, thermal conductivity, low friction and smooth surface, anti-wear, anti-fatigue and anti-corrosion. There is no material that fully meets all the criteria, so a compromise is often chosen in most designs. Materials commonly used in the manufacture of radial bearings include the following:

 

Bearing alloy: Bearing alloy, also known as babbitt, is the most widely used bearing alloy. It can adapt to the automatic adjustment of small misalignments or defective shafts, and can absorb impurities in the lubricant to avoid shaft glue damage.

 

Bronze: Bronze bearings are suitable for low-speed, heavy-duty and well-neutral conditions, and their properties can be obtained by alloying with a variety of materials with different compositions.

 

Lead copper: a bearing made of lead copper, its load capacity is higher than that of the bearing alloy, but the relative adaptability will be poor, and it is used in the environment with good shaft rigidity and good centering.

 

Cast iron: Cast iron bearings are more used in less stringent occasions. However, the hardness of the journal is required to be higher than that of the bearing, and the working surface needs to be carefully run by a mixture of graphite and oil, and the alignment of the journal and the bearing must be good.

 

Perforated bearings: Perforated bearings are manufactured by sintering metal powder and immersing it in oil, which has self-lubricating properties and is mainly used in applications where reliable lubrication is difficult or impossible.

 

Carbon and plastic: Pure carbon bearings are suitable for high temperature applications or applications where lubrication is difficult, while bearings made of PTFE have a very low coefficient of friction and can withstand intermittent oscillation and heavy loads at low speeds, even when operating without oil lubrication.