CLASSIFICATION OF FORMING PROCESS: Shearing Process, Punching, Blanking, Perforating, Parting, Notching, Lancing

CLASSIFICATION OF FORMING PROCESS 

The sheet metal forming processes can be classified into mainly two categories. They are:
 

Shearing Process

Shearing is a cutting operation used to remove a blank of required diemnsions from a large
sheet. Shearing process includes.
 
Punching
 
Blanking
 
Perforating
 
Parting
 
Notching
 
Lancing


Principle of Shearing

When a punch penetrates a sheet metal workpiece and enters in to the die, a section through the
work piece provides a smooth cut area
 


Punching

In punching, hole is the discarded product, the material punched out to form the hole being
waste. i.e., the cut out part is waste and left out piece is of importance
Punching
Punching

 



Blanking

If the removed piece is the useful part and the rest is scrap, the operation is called blanking. The
cut out part from the strip is the required component.
Blanking
Blanking

 

 


The main difference between the punching and blanking is that in punching the metal inside the
part is removed and in blanking the metal around the part is removed.
 
Blanking

 

 



Perforating

Punching a number of uniformly spaced holes in a sheet is called perforating. The holes may be
of any size and shape
Perforating
Perforating

 



Parting

Shearing the sheet into two or more pieces is called parting. It is shown in Fig.
Parting
Parting


Notching

Removing pieces from the edges is called notching. It is an operation in which a specified small
amount of metal is cut from a blank.
Notching

 

 

 

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