Drawing is sheet-metal forming operation used to make cup-shaped box shaped or other more complex curved, hollow shaped parts.
It is performed by placing a sheet metal blank over die cavity and then pushing the metal into the opening with a punch.
The blank must usually be held down flat against the die by a blank holder.
Applications:- beverage cans, cooking pots and automobile body panels.
Deep drawing is a sheet metal forming process in which a sheet metal blank I radially drawn into a forming die by the mechanical action of a punch.
The process is considered deep drawing when the depth of the drawn part exceeds its diameter.
This is achieved by redrawing the part through a series of dies. The flange regio experiences a radial drawing stress and a tangential compressive stress due to the material retention property.
These compressive stresses result in flange wrinkles. Wrinkles can be prevented by using a blank holder, the function of which is to facilitate controlled material flow into the die radius.
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