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Coining is a form of precision stamping in which a workpiece is subjected to a sufficiently high stress to induce plastic flow on the surface of the material. A beneficial feature is that in some metals, the plastic flow reduces surface grain size, and work hardens the surface, while the material deeper in the part retains its toughness and ...
Stamping (also known as pressing) is the process of placing flat sheet metal in either blank or coil form into a stamping press where a tool and die surface forms the metal into a net shape. Stamping includes a variety of sheet-metal forming manufacturing processes, such as punching using a machine press or stamping press , blanking, embossing ...
Niello / n iː ˈ ɛ l oʊ / [1] [2] is a black mixture, usually of sulphur, copper, silver, and lead, [3] used as an inlay on engraved or etched metal, especially silver. It is added as a powder or paste, then fired until it melts or at least softens, and flows or is pushed into the engraved lines in the metal.
Today, depending on the dealer, "Pinchbeck" can mean original Pinchbeck or any gilt metal. [1] Pinchbeck fell out of use in the second half of the 19th century, being replaced by low-carat gold which had been legalised in 1854. [3] Pinchbeck is typically composed of copper and zinc in ratios of 89% copper to 11% zinc; or 93% copper to 7% zinc. [4]
The hardness of the plate surface made it possible to print a good number of impressions without the metal of the plate wearing the lines out under the pressure of repeated intaglio printing, which would have happened with unfaced copper. So "A shimmering pale grey became for the first time a possibility in line engraving, and it is this that ...
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Precision Metalforming Association or PMA is a trade association [1] representing the $137-billion metalforming industry of North America: the industry that creates precision metal products using stamping, fabricating, spinning, slide forming and roll forming technologies, and other value-added processes. PMA’s origin was the Pressed Metal ...