Punching, Perforating, Notching, and Mitering :
In the Punching process, a part of the material is removed by shearing from the body of the material. The removed part is scrap. These processes shall not be mixed up with blanking(stamping) in the blanked out slug is the product, and the remainder of the strip is scrap. Blanking is not a process used in roll-forming lines. Punching, notching, mitering, and other press operations can be completed in roll forming line. In the punching process, a part of the material removed by shearing from the body of the material. The removed part is scrap. These processes shall not be mixed up with blanking(stamping) in the blanked out slug is the product, and the remainder of the strip is scrap. Blanking is not a process used in roll-forming lines. Punching, notching, mitering, and other press operations can be completed in roll forming line.
Punching:
Punching is incorrectly called piercing. Piercing is achieved with special punches, which leave a hole in the material and flange it without creating a slug.
Perforating:
Perforating is punching a large number of small holes in a symmetrical pattern.
Perforating requires special equipment and tooling.
In some cases, a perforated pattern can be punched in-line at high speed. Having this process included in the line could save considerably on the cost of buying and stocking pre-perforated coils.
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