Coining_(machining)

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Coining is a form of precision stamping. It differs from simple stamping in that enough pressure is used to cause plastic flow of the surface of the material. A beneficial feature is that in some materials, such as phosphor bronze, the plastic flow breaks up the surface grains, work hardening the surface, while the material deeper in the part retains its strength, toughness, ductility and flexibility.

Coining sometimes uses several dies to produce near-net shapes.

Mints use coining to produce money (coins), medals, police and fire fighter\'s badges, precision-energy springs and precision parts with small or polished surface features.

1818 engraving depicting the coining press as used in the Royal Mint

See Also

• Coin die

v • d • e Metal forming
Metal forming	Coin die · Coining · Cold rolling · Die · Drawing · Electromagnetic forming · Flypress · Hot rolling · Hydraulic press · Hydroforming · Machine press · Progressive stamping · Progressive die · Punching · Punch press · Rolling · Shear · Sinking · Stamping press · Metal spinning · Swage
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