Coining (metalworking)

Coining is a form of precision

work hardens the surface, while the material deeper in the part retains its toughness and ductility. The term comes from the initial use of the process: manufacturing of coins

.

Coining is used to manufacture parts for all industries and is commonly used when high relief or very fine features are required. For example, it is used to produce

buttons, precision-energy springs

and precision parts with small or polished surface features.

Coining is a cold working process similar in other respects to forging, which takes place at elevated temperature; it uses a great deal of force to elastically deform a workpiece, so that 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 elastically deformed and not actually cut, as in some other forms of stamping. The coining process is preferred when there is a high tonnage.

Coining for currency

Coining in electronic industry

In

bonding pads to enhance adhesion, which are further flattened by the coining process. Unlike typical coining applications, in this case the goal of coining is to create a flat, rather than patterned, surface.^[1]

References

^ "US Patent 5132772 - Semiconductor device having tape automated bonding (TAB) leads which facilitate lead bonding" Archived 2009-09-10 at the Wayback Machine, section "Background of the invention", which gives an overview of common techniques

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[1] "US Patent 5132772 - Semiconductor device having tape automated bonding (TAB) leads which facilitate lead bonding" Archived 2009-09-10 at the Wayback Machine, section "Background of the invention", which gives an overview of common techniques

[1]