Which tool is specifically used to form sheets into cylinders or curved surfaces?

The tool specifically used to form sheets into cylinders or curved surfaces is the slip roll former. This specialized machine operates with three rollers that allow users to pass flat sheet metal through the rollers, gradually bending and shaping it into a curved form. The unique configuration of the slip roll former enables it not only to create simple curves but also to form full cylinders by overlapping the edges of the metal sheet, making it an essential tool in metalworking for tasks that require consistent and precise curved shapes.

The bending machine typically refers to a less specific tool that might be used for various types of bends but does not focus specifically on creating cylindrical shapes. The press brake is primarily used for making straight bends along specified lines, often producing angular bends rather than curves. The shear cutter is designed for cutting metal sheets into desired sizes, not for forming or bending them into cylindrical shapes. Thus, the slip roll former is the most suitable choice for creating curves and cylinders in sheet metal.