The operations of die cutting shearing of work materials are
classified as follows :
Piercing Punching
Is the operation in which a round punch, or of other
contour, cut a hole in the work
material which is supported by a die having an opening corresponding
exactly to the contour of the punch.
The material slug cut from the work material is often scrap.
Blanking
Fundamentally differs from piercing only in that the part
cut from the work material is usable, becoming a blank workpiece for subsequent
press working or other processing.
Lancing
Combines bending and cutting along a line in the work
material.
It does not produce a detached slug and leaves a bent
portion, or tab , attached to the work material.
A cutt off
Operation achieves complete separation of the work material
by cutting it along straight or curved lines.
A notching
Operation cuts out various shapes from the edge of workpiece
material a blank or part.
Shaving
Is a secondary shearing or cutting operation in which the
surface of a previously cut edge of a workpiece is finished or smoothed.
Punch and die clearance for a shaving die, considerably less
than that for other cutting dies, allows a thin portion or shaving to be
cleanly cut from such a surface of workpiece.
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