Blanking and Punching :
Blanking and punching both are sheet metal cutting
operations that involve cutting the sheet metal via shearing by
a punch and die.
Case – I
If the part that is cut out is the desired product and remaining
part is removed as waste, the operation is called blanking and the product is called blank.
Case –II
If the remaining stock is the desired part and the material punched
out is removed as waste the operation is called punching.
Both operations are illustrated on the example of producing
a washer.
Force required for Blanking and Punching process
F =StL
Where
L = total length sheared
( for circle L = πd )
t = Thickness of metal sheet
S = shear strenth
of metal sheet
Stripping force - Force develops due to the spring back of the
punched material that grips the punch.
SF = 0.02 Lt
Where
L = total length sheared
( for circle L = πd )
t = Thickness of metal sheet
Blanking process
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Punching process
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