Explain drawing operation on press with neat sketch.
Drawing Operation:
1. The drawing is the operation of production of cup shaped parts from flat sheet metal blanks by bending and plastic flow of the metal.
2. The blank is placed on die and while punch descend, the pressure pad holds the blank firmly on the die.
3. As the punch descend further, the blank is pushed in the cavity of the die and the metal is made to flow plastically while it is drawn over the edges to form sides of the cup. The operation is also known as cupping.
4. In this, clearance between punch and die is greater. The drawing operation is illustrated in Fig.