Forging is a manufacturing process involving the shaping of metal using localized compressive forces.
The blows are delivered with a hammer (often a power hammer) or a die.
Forging is often classified according to the temperature at which it is performed: cold forging (a type of cold working),
warm forging, or hot forging (a type of hot working). For the latter two, the metal is heated,
usually in a forge. Forged parts can range in weight from less than a kilogram to hundreds of metric tons.
Forging has been done by smiths for millennia; the traditional products were kitchenware, hardware, hand tools, edged weapons, cymbals, and jewelry.
Since the Industrial Revolution, forged parts are widely used in mechanisms and machines wherever a component requires high strength;
such forgings usually require further processing (such as machining) to achieve a finished part.