Ring rolling (also known as ring rolling, ring rolling, reaming, and ring rolling) is a plastic processing technology that uses a ring rolling machine (also known as a ring rolling machine, ring rolling mill, and reaming machine) to produce continuous local plastic deformation of the ring piece, so as to reduce the wall thickness, expand the diameter, and form the cross-section profile. This process is suitable for the production of various shapes and sizes of annular mechanical parts, such as bearing rings, gear rings, flanges, hubs, thin-walled cylindrical parts, wind power flanges, high-neck flanges and other types of seamless annular forgings. Ring products are widely used in machinery, automobiles, trains, ships, petrochemical, aviation, aerospace, atomic energy, wind power and many other industrial fields. The materials of the rings are usually carbon steel, alloy steel, stainless steel, titanium alloy, copper alloy, aluminum alloy, cobalt alloy, nickel-based alloy, high-temperature alloy, etc.