The main working components and tools on a rolling mill that cause continuous plastic deformation of metal. The rolling mill is mainly composed of three parts: the roller body, the roller neck, and the shaft head. The roll body is the middle part of the rolling mill that actually participates in rolling metal. It has a smooth cylindrical or grooved surface. The roller neck is installed in the bearing and transmits the rolling force to the frame through the bearing seat and pressing device. The drive end shaft head is connected to the gear seat through a connecting shaft, transmitting the rotational torque of the electric motor to the rolling mill. The rolling rolls can be arranged in the form of two rolls, three rolls, four rolls, or multiple rolls in the rolling mill frame.

Roll classification
There are various classification methods for rolling mills, mainly including: (1) strip rolling mills, profile steel rolling mills, wire rolling mills, etc. according to product types; (2) According to the position of the rolling mill rolls in the rolling mill series, there are opening rolls, rough rolls, finishing rolls, etc; (3) According to the function of the rolling mill, it is divided into descaling roller, piercing roller, leveling roller, etc; (4) According to the material of the rollers, there are steel rollers, cast iron rollers, hard alloy rollers, ceramic rollers, etc; (5) According to manufacturing methods, there are casting rollers, forging rollers, welding rollers, and sleeve rollers; (6) According to the state of the rolled steel, there are hot rolling rolls and cold rolling rolls. Various classifications can be combined accordingly to give rolling rolls a clearer meaning, such as centrifugal cast high chromium cast iron working rolls for hot-rolled strip steel.