There are different types of Plate Bending Machines are used in sheet metal fabrication.
Hydraulic Plate Bending Machine
Mechanical Plate Bending Machine
NC Plate Bending Machine
CNC Plate Bending Machine
These machines are also known from the different names in different countries like, Plate Rolling Machine, Plate Roller, Sheet Rolling Machine, Plate Roll etc.
Fabrication of tanks and cylindrical part are common now a days, Fabricators mostly using 3 roll mechanical plate bending machines.
As I have used many machines like hydraulic sheet rolling machine & Mechanical Sheet Rolling Machine, but as per my experience i can suggest 2 type of machines should be used for better quality of forming and Edge bending of shell even re-rolling.
no 1 I would suggest 4 roll hydraulic double pinch sheet rolling machine
no 2 i suggest 3 roll variable geometry hydraulic plate rolling machine
Advantages of hydraulic plate bending machine:
better accuracy than 3 roll plate rolling machine
easy handling of plate before forming shell
Easy to operate
best pre-bending or edge forming
easy cone bending in four roll arrangement.