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Power Press
Submitted To:-
Submitted by:- Mr. Rajeev K Dang
Kanwaldeep Singh ,SG12927
Jigmat Dolma ,SG12926
Mechanical 5th sem

Contents
 Introduction,
 Types of presses,
 Power press parts
 Press size
 Press tools
 Applications

Introduction
 The press is a metal forming machine tool
designed to shape or cut metal by applying
mechanical force or pressure .
 The metal is formed to the desired shape
without removal of chips.
 Presses and press tools facilitate mass
production work.
 These are considered fastest and most efficient
way to form a sheet metal into finished products.

TYPES OF PRESSES
1. CLASSIFICATION BASED ON SOURCE OF
POWER
 Manually Operated or Power Driven
These presses are used to process thin sheet metal
working operations where less pressure or force is
required. These are operated by manual power. Most
of manually operated presses are hand press, ball
press or fly press.
 Power Presses
Power presses are normally driven by mechanical
mechanism or hydraulic system. Power source of
these presses may be electric motor or engine.

2. CLASIFICATION BASED ON DESIGN OF
FRAME
 Gap Frame Press
These presses have larger frame
openings, that means a wide gap
between its base and ram to
accommodate larger work pieces.
It also has longer beds.
 Inclinable Frame Press
Its frame is called inclinable due
to its capability to tilt back up to
some angle. Its back is open to exit
the scrap so it is also called open
back inclinable press.

 Adjustable Bed Type Press
Its bed (knee) can be adjusted at any
desirable height by moving it vertically up
or down with the help of power screws.
This enables the settings of different sizes
of work and dies on the machine.
 Straight Side Press
It has two vertical rigid frames mounted
on two sides of the base which are intended
for absorbing severe load exerted by the
ram. The machine is suitable for heavy work
but due to presence of side frames ,the sheet
Metal cannot be fed from the side.

 Horn like press
The horn press has a cylindrical horn like projection from
the machine frame ,which serves as the die support . The
horns may be interchanged for different sizes of work.
 Pillar press
The pillar press is a hydraulic press having
four pillars mounted on the base .The
pillars support and guide the ram.

Parts of power press
 Base
The base is the supporting member of the press and
provides arrangement for tilting and clamping the
frame in an inclined press.
 Frame
Frame constitute main body of the press located at
one edge of its base. It houses support for ram,
driving mechanism and control mechanisms. All
presses except the straight side type have “C”
shaped frame to take up the vertical thrust of the
ram.
 Bolster Plate
It is the flat plate fitted on the base for supporting the
die block and other accessories of the press.

 Ram
Ram reciprocates to and fro within its guide ways
with prescribed stroke length and power. The stroke
length and power transferred can be adjusted as per
the requirements. Ram at its bottom end carries
punch to process the work piece.
 Pitman
It is the part which connects the ram and crankshaft
or ram eccentric.
 Driving mechanism
The rotary movement of the motor is converted into
the reciprocating movement of the ram by crank and
connecting rod,eccentric and connecting rod in
mechanical presses.

 Fly Wheel
The flywheel is mounted at the edge of the driving
shaft and is connected to it through a clutch. The
energy is stored up in the fly wheel during idle periods
and it is expected to maintain the constant speed of
the ram when the punch is pressed into the work .
 Clutch
The clutch is used for connecting and disconnecting
and the driving shaft with the flywheel when it is
necessary to start or stop the movement of the ram.
 Brakes
The brakes are used to stop the movement of the
driving shaft immediately after it is disconnected from
the fly wheel

Press size
 The size of the press is designated by its maximum
capacity of applying load on a piece of blank , and it is
expressed in tones.
 The bed area is also considered in the press size.
 Mechanical
Capacities to 6,000 tons
Force varies throughout
the stroke
Limited/difficult overload
 Hydraulic
50,000 + ton capacities
Large force available at
the top of the stroke
Overload protection

Press Tools
 Punch:-
It is that part of the press tool which enters into the cavity
formed in the die section .The punch is usually the upper
member of the press tool which is mounted on the lower
end of the ram and slides with it.
 Die:-
A die is that part of the press tool which has opening cavity to
receive the punch .The die is usually the lower member of
the press tool which is clamped on the bolster plate fitted
on the table and remain stationary.
 Die set:-
Both die and punch work together as a unit and this is called
a die set. Punch and die both are made of high speed
steel. Die is the part where strength and wear resistant
both properties are required. So normally working surface

Punch Plate:-
Lower end of the ram holds punch holder which is equipped
with the punch plate. Punch plate is generally made of
stainless steel or HSS. The punch plate holds the punch
rigidly and accurately.
Different ways of holding the punch are:-

Application of power press
 Power presses are used for punching or stamping,
forming or drawing and embossing operation. Press
brakes are used for bending operations.
 Press working is used in large number of industries like
automobile industry, aircraft industry, telecommunication
electrical appliance, utensils making industry are major
examples

Some example of the products formed
by the presses.

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Power press

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