Explain the following press operations (a) Punching (b) Drawing

Explain the following press operations (a) Punching (b) Drawing
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Answer :

a) Punching: In punching operation, a hole is the desired result. The size of hole is determined by the size of punch and clearance is allowed on the die. The figure shows the spacing of hole on plate2 is actuated by the stop1 the stripper plate 4 is attached to die body 5 prevents sheet metal from being lifted along with the punch 3 after punching operation.

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b) Drawing:

[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 descends, 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.

[5] The drawing operation is illustrated in Fig.  

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