Punching

Punching is a forming process that uses a punch press to force a tool, called a punch, through the workpiece to create a hole via shearing. Punching is applicable to a wide variety of materials that come in sheet form, including sheet metal, paper, vulcanized fibre and some forms of plastic sheet. The punch often passes through the work into a die.

A scrap slug from the hole is deposited into the die in the process.
Depending on the material being punched this slug may be recycled and reused or discarded.

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Source: Wikipedia · Image: Wikimedia Commons · CC0

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