Blanking and piercing

Blanking and piercing are shearing processes in which a punch and die are used to modify webs.The tooling and processes are the same between the two, only the terminology is different: in blanking the punched out piece is used and called a blank; in piercing the punched out piece is scrap.The process for parts manufactured simultaneously with both techniques is often termed "pierce and blank." An alternative name of piercing is punching.

Characterization of part quality and potential defects

Burrs and die rolls are typical defects of trimmed surfaces. The surface finish will be lower in the so-called fracture zone, i.e. where the material is irregularly stripped away from the matching surface, at the end of the shearing operation. Die roll is a plastic deformation of the sheet edge, which causes permanent edge rounding.

Burr height is typically used as an index to measure tool wear, because it is easy to measure during production.

Process variants

There are various types of blanking and piercing: lancing, perforating, notching, nibbling, shaving, cutoff, and dinking.

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Stamping (metalworking)

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, 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.