Coining ProcessBy

Avinash N. Fulbaria

ConceptIntroductionTechniques of CoiningAdvantages of CoiningIndustrial Application

IntroductionCoining is a cold working process that uses a

great deal of force to plastically deform a workpiece, so it conforms to a die. Coining can be done using a gear driven press, a mechanical press, or more commonly a hydraulically actuated press. Coining typically requires higher tonnage presses than stamping, because the workpiece is plastically deformed and nor actually cut. The coining process is preferred when there is a high tonnage.

Techniques of CoiningCompletely closed dies are used for this

process.High pressure is applied on the closed die

containing the metal work piece.As a result of the high deformative stress, the

metal conforms to the shape of the die.Lubricants are not used in coining as they are

incompressible.

Coining Process

Advantages Of CoiningProvide finer and detailed surface finishProvide accurate bends in a consistent

mannerDoes not require expensive machineryThe work hardened surface can resist impact

and abrasionEliminate the need for complex finishing

processesPlastic flow reduces the surface grain size

and work hardens the surface.

Industrial ApplicationsMinting of coins and medallionsMaking of jewelryMaking badges, buttons, precision- energy

springsMaking complex electronic partsMaking precision parts that require finer

polished surface finishes.

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