A round cylinder of metal can have a flanged formation on either one end or both ends. This is generally known as a flanged tube.
Blue Valley Machines are (as a group) able to produce flanged tubes with a thickness range of about 16 gauge / 1.5 mm to 7/8" / 22 mm and a diameter range of 12" / 300 mm to 12 feet / 3.75 meters.
Blue Valley Machines Capable of Producing this Work Piece
Tube Flanging Machine
These machines are dedicated to the flanging of tubes. Some of this work can be automated.