Workshop Technology
In sheet metal blanking, shear is provided on punches and dies so that

Cut blanks is straight
Good cut edge is obtained
Warping of sheet is minimized
Press load is reduced

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Workshop Technology
Piercing is an operation of cutting

A cylindrical hole in a sheet of metal by the punch and the die
A flat sheet to the desired shape
A hole (other than cylindrical) in a sheet of metal by the punch and the die
A number of holes evenly spaced in a regular pattern on a sheet of metal

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