Submitted to
Puneet kamboj
 Press
working processes make use of large
forces by press tools for a short interval of
time which result in cutting or shaping the
sheet metal
 Press working process does not involve
heating of the part and high surface finish
can be obtain.
 Press worked part do not require any
machining process.
A
press working operation involves
application of large forces by press tool to
cut or shape the sheet metal
 The press working operation is generally
completed in one stroke of the press and
often result in the production of a finished
part in less than one second
 Shearing
 Blanking
 Piercing
 Trimming
 Punching
 Notching
 Shaving
 Embossing
 stamping
 Shearing:-Separating material into two parts
 Blanking:- Removing material to use for
parts.
 Punching:-Removing material as scrap
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Blanking is a cutting process in which a piece of sheet metal is
removed from a larger piece of stock by applying a
great shearing force.
the piece removed, called the blank, is not scrap
The blanking process requires a blanking press, sheet metal
stock, blanking punch, and blanking die. The sheet metal stock is
placed over the die in the blanking press. The die, instead of
having a cavity, has a cut out in the shape of the desired part and
must be custom made unless a standard shape is being formed.
The hydraulic press drives the punch downward at high speed
into the sheet. A small clearance, typically 10-20% of the
material thickness, exists between the punch and die.
When the punch impacts the sheet, the metal in this clearance
quickly bends and then fractures. The blank which has been
sheared from the stock now falls freely into the gap in the die.
This process is extremely fast, with some blanking presses
capable of performing over 1000 strokes per minute.
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Punching is a the cutting of a slug from the metal to
produce a hole by applying a great enough shearing force.
Punching is very similar to blanking except that the
removed material, called the slug, is scrap and leaves
behind the desired internal feature in the sheet, such as a
hole or slot. Punching can be used to produce holes and
cut outs of various shapes and sizes.
The punching process requires a punch press, sheet
metal stock, punch, and die. The sheet metal stock is
positioned between the punch and die inside the punch
press. The die, located underneath the sheet,
The punch press drives the punch downward at high speed
through the sheet and into the die below. There is a small
clearance between the edge of the punch and the die,
causing the material to quickly bend and fracture.
The slug that is punched out of the sheet falls freely
through the tapered opening in the die.
 During
any working process in which the part
in place by the press, the outer edge of the
part which is the area usually gripped,
become marked and scored . Trimming is the
cutting off of this excess of metal edge.
 Trimming may be performed horizontally or
vertically, depending upon the configuration
of the part.
 Piercing
is
punching process.
 It is use to make
hole.
 In piercing a
pointed bullet
shaped punch is
forced through the
sheet metal to
produce hole.
 Notching
is the cutting of relatively small
indention in the edge of a strip or part
 Shaving is a secondary searing or cutting
operation in which the surface of a
previously cut edge is finished or smooth.