What is stamping?
Stamping 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, 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.
Common stamping process
Bending - the material is deformed or bent along a straight line.
Flanging - the material is bent along a curved line.
Embossing - the material is stretched into a shallow depression. Used primarily for adding decorative patterns.
Blanking - a piece is cut out of a sheet of the material, usually to make a blank for further processing.
Coining - a pattern is compressed or squeezed into the material. Traditionally used to make coins. Drawing - the surface area of a blank is stretched into an alternate shape via controlled material flow.
Stretching - the surface area of a blank is increased by tension, with no inward movement of the blank edge. Often used to make smooth auto body parts.
Ironing - the material is squeezed and reduced in thickness along a vertical wall. Used for beverage cans and ammunition cartridge cases.
Reducing/Necking - used to gradually reduce the diameter of the open end of a vessel or tube.
Curling - deforming material into a tubular profile. Door hinges are a common example.
Hemming - folding an edge over onto itself to add thickness. The edges of automobile doors are usually hemmed.
Piercing and cutting can also be performed in stamping presses. Progressive stamping is a combination of the above methods done with a set of dies in a row through which a strip of the material passes one step at a time.
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