Punching, Perforating, Notching, and Mitering :

Secondary Operations in the Roll Forming Line: In the punching process, a part of the material remove 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 and notching and mitering, and other press operations can complete in the roll forming line. In the punching process, a part of the material remove by shearing from the body of the material. The removed part is scrap. These processes shall not mix 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 complete in roll forming line.

 

 

 

 

Punching:

Punching incorrectly calls piercing. Piercing is achieved with special punches, which leave a hole in the material and flange it without creating a slug.

Perforating:
a 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.

Punching process

Punching process

Notching:
as you know, Notching is a process where part of the strip edge is cut out. Sometimes, punched holes cut through at a later stage appear as notches in the finished products.
Mitering:
in fact, Mitering is a punching or notching operation, which prepares the ends of the formed profile to fit for bending assembly. This process is applied to make frames for pictures, windows, doors, and other products.

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