This is mainly all about the Contour Forming and its applications. Hope this can help you.

2. ROLL FORMING (CONTOUR ROLL FORMING)
(also known as roll forming or cold roll
forming) is a continuous process for forming
metal from sheet, strip, or coiled stock into desired
shapes by feeding the stock through a series of roll
stations equipped with contoured rolls called
roller dies. Most contour roll forming is done by
working the stock progressively in two or more
stations until the finished shape is produced.

3. AUXILIARY OPERATIONS such as:
 Notching
 Slotting
 Punching
 Embossing
 Curving
 Coiling
can easily be combined with contour roll forming.

4. Contour roll forming is used in many diverse
industries to produce a variety of shapes and products.
Industries that use roll-formed products include :
 automotive
 building
 office furniture
 home appliance and home product
 medical
 railcar
 Aircraft
 ventilation
 air conditioning industries

6. Contour roll forming requires less force and offers
the ADVANTAGE of theoretically unlimited length
as the material need only pass through the rollers.
However, they still employ the basic principle of
bending the metal beyond its elastic limits. As a
result, contour roll forming machines strengthen
the metal just like stretch forming machines.