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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 ...
By the middle of the twentieth century, hundreds of stamp clubs had formed throughout the United States, often affiliated with large organizations, such as the American Philatelic Society or the American Topical Association. Many published their own scholarly articles or journals, while others advertised in the journals of larger philatelic ...
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 ...
Small stamps were commonly powered by water wheels and larger ones by steam engines. Californian stamps were based on Cornish stamps and were used for the Californian gold mines. In these stamps the cam is arranged to lift the stamp from the side, so that it causes the stamp to rotate. This evens the wear on the shoe at the foot of the stamp.
Sheet metal embossing is a metalworking process for producing raised or sunken designs or relief in sheet metal. In contrast to coining (which uses unmatched dies), embossing uses matched male and female dies [ 1 ] to achieve the pattern, either by stamping , or by passing a sheet or strip of metal between patterned rollers . [ 2 ]
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.
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