Types of Cold Rolling Mill Bearings

Cold rolling mill bearings are a key part of any manufacturing process. These bearings are usually supplied with grease lubrication and are capable of relubrication through their inner or outer ring. In addition, these bearings are highly durable. However, they require a significant amount of maintenance.

Four-row tapered roller bearings

Four-row tapered roller bearings are a type of bearing that is primarily used in steel rolling mill machines. They are similar to double-row tapered roller bearings, but can handle stronger radial loads. The cages on these bearings are made of steel plate stampings and are also carburized. This process increases the toughness of the cages. The cages of four-row tapered roller bearings are usually fitted with a spacer to adjust their radial and axial clearance.

Four-row tapered roller bearings are used in rolling mills and are designed for high loads and speeds. They also can handle high temperatures and unfavorable ambient conditions. Their performance is similar to that of double-row tapered roller bearings, but they can take higher radial loads and have a lower limit speed. They are mainly used in heavy machines and are available in both sealed and open types.

Spherical roller bearings

The geometry of spherical roller bearings is based on the spherical shape of a sphere and facilitates self-alignment. These bearings are typically manufactured with a flange which contains the ring and complement in a single assembly. The flange helps prevent the rollers from deflecting during high-acceleration movements. These bearings can accommodate high radial and axial loads and can have long service lives.

Another important characteristic of spherical roller bearings is their self-alignment capabilities under heavy load. This is achieved by the design of the bearing cage with a hardened guide ring centered in the outer raceway. They also usually have reinforced rollers to resist dynamic accelerations. These rollers are usually housed in window-type cages.

Oil film bearings

Oil film bearings are a critical component of cold rolling mill machinery. They are used to transmit rolling pressure and are available in different types such as hydrodynamic and hydrostatic. Designed to meet specific requirements, they can accommodate different speeds, heavy loads, and bad working conditions. The various components of oil film bearing systems include radial and axial load taking systems, sealing, locking, monitoring, and protection systems.

Unlike conventional bearings, oil film bearings operate on a hydrodynamic film of oil. This film is completely encased within the roll neck and has a high load carrying capacity. It is also characterized by low co-efficient of friction and low space requirement.

Slider bearings with metallic bush

The bimetallic bush is made of two different metal layers that are bonded together. The deformation of the bimetallic bush occurs on the contact surface between the two layers. It is an effect of the difference reduction on the material properties. The deformation of the two layers mainly occurs at the contact surface in the thickness direction of the sleeve. In addition, the distribution of the compressive stress of the two metal layers is almost symmetrical, and the maximum stress is at the beginning of the rolling process.

Non-metallic bush bearings are another type of slider bearings. Non-metallic bush bearings use fabric base moulded sections instead of gun metal. Fibre bearings are the most common type of non-metallic bush bearing. They provide a high degree of bearing performance for rolls with varying speeds. They are also suitable for reversing rotation. They are also inexpensive.

Cylindrical roller bearings

Cylindrical roller bearings are one of the main types of bearings for rolling mills. They are designed to carry heavy radial and axial loads. They are usually installed in pairs and are arranged with the rollers in an X or O-shaped relationship. They are available in a variety of different sizes and shapes, and their designs can vary depending on the type of application.

The most common type of cylindrical roller bearings is made of low-carbon or alloy steel. However, some applications require high-carbon or bearing-grade steel. These steels are usually case-hardened using induction heating or conventional heating methods. Then, after the steel has been machined to the desired depth, it is combined with low-carbon steel for added strength. This ensures that a balanced combination of hard case and tough core is achieved.