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In Die cutting operation, punching a number of holes in a sheet is called 

In Die cutting operation, punching a number of holes in a sheet is called  Correct Answer Perforating

Concept:

Shearing is a cutting operation used to remove a blank of required dimensions from a large sheet. The shearing operations which make use of a die, include punching, blanking, piercing, notching, trimming, and nibbling.

Punching/Blanking: Punching or blanking is a process in which the punch removes a portion of material from the larger piece or a strip of sheet metal. If the small removed piece is discarded, the operation is called punching, whereas if the small removed piece is the useful part and the rest is scrap, the operation is called blanking.

Piercing: It is a process by which a hole is cut (or torn) in metal. It is different from punching in that piercing does not generate a slug.

Perforating: It is an operation in which a number of uniformly spaced holes are punched in a sheet of metal. The holes may be of any size or shape. They usually cover the entire sheet of metal.

Notching: It is an operation in which a specified small amount of metal is cut from the edges.

Lancing: It is an operation of cutting a sheet metal through a small length and then bending this cut portion.

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