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Stamping operation
Stamping operation
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. See also Repoussé and chasing.
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. See also deep drawing.
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.
