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. They includes a variety of sheet-metal forming manufacturing processes, such as punching using a machine press or stamping press, blanking, embossing, bending, flanging, and coining. This could be a single stage operation where every stroke of the press produces the desired form on the sheet metal part, or could occur through a series of stages. The process is usually carried out on sheet metal, but can also be used on other materials, such as polystyrene.

Stamping is usually done on cold metal sheet. See Forging for hot metal forming operations.

Stamped parts were used for mass-produced bicycles in the 1880s. They replaced die forging and machining, resulting in greatly reduced cost. Although not as strong as die forged parts, they were of good enough quality.

Stamped bicycle parts were being imported into the United States from Germany in 1890. U.S. companies then started to have stamping machines custom built by U.S. machine tool makers. Through research and development Western Wheel was able to stamp most bicycle parts.

Several automobile manufacturers adopted stamped parts before Ford Motor Company. Henry Ford resisted the recommendations of his engineers to use them, but when the company could not satisfy the demand with die forged parts, Ford was forced to use them.

Above info is from the reference.

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