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

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

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

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