Freeman, Ralph L. Formerly, Department of Mechanical Engineering, Iowa State College, Ames, Iowa.
Last reviewed:October 2019
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A cold metalworking process in a press-type die. Coining is used to produce embossed parts, such as badges and medals, and for minting of coins. It is also used on portions of a blank or workpiece to form corners, indentations, or raised sections, frequently as part of a progressive die operation. The work is subjected to high pressure within the die cavity and thereby forced to flow plastically into the die details. The absence of overflow of excess metal from between the dies is characteristic of coining and is responsible for the fine detail achieved. However, because this action requires highly accurate dies and higher-than-usual die pressures, only essential surfaces are coined. See also: Metal forming
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