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A car panel is made by three methods. First, sheet steel is made.
This is done by pushing a piece of steel between two rollers, which
squeeze the metal and make it longer and thinner. This method is
called rolling. Not all metals can be rolled. For example, iron can
not be rolled because it is too brittle. But steel can be because
it is tough and malleable enough.Next, the steel is cut into a flat shape. This is done by placing the sheet onto a die, and then cutting a hole in it with a punch. The
method is called punching. The steel can be cut easily because it is
now very thin. Finally, the sheet steel is bent and pressed into a rounded
shape. This is done by putting the sheet onto a die and then bending the sheet around the die with a press. This method is called pressing. It is not difficult to press sheet steel because it is thin and malleable.