Coining is a cold working process that uses high pressure to plastically deform a workpiece between two closed dies to conform to their shapes. It provides a finer, more detailed surface finish than other processes like stamping. Coining does not require cutting or expensive machinery. It work hardens the surface of the material, making the finished parts more impact and abrasion resistant and eliminating the need for further finishing steps. Industrial applications of coining include minting coins and medals, making jewelry, precision springs, electronic parts, and other complex parts requiring polished surfaces.

2. Concept
 Introduction
 Techniques of Coining
 Advantages of Coining
 Industrial Application

3. Introduction
Coining 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.

4. Techniques of Coining
Completely 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.

5. Coining Process

6. Advantages Of Coining
Provide finer and detailed surface finish
Provide accurate bends in a consistent manner
Does not require expensive machinery
The work hardened surface can resist impact and
abrasion
Eliminate the need for complex finishing processes
Plastic flow reduces the surface grain size and work
hardens the surface.

7. Industrial Applications
Minting of coins and medallions
Making of jewelry
Making badges, buttons, precision- energy springs
Making complex electronic parts
Making precision parts that require finer polished
surface finishes.

8. END