ABSTRACT
We
are using scissors for simple sheet metal cutting. It is a manual
method so that sheet metals are to be wasted sometime because of
mistakes happened such as wrong dimensions etc., and also even a
simple cutting may take long time.Hydraulic machines are also
available for sheet metal cutting. But this method is used for only
heavy metal cutting and its cost is very high.We are using a
pneumatic system for sheet metal cutting in a easy way. It is
operated by a pneumatic hand lever of two way control valve.Control
valve is operated by a compressor.
 COMPONENTS USED
  • Double acting
    cylinder
  • Pneumatic hand
    operated valve
  • High speed steel
    blade
SPECIFICATIONS

PNEUMATIC
CYLINDER
Stroke
length = 150mm
Diameter
= 50mm

Pressure = 10bar


SHEET CUTTER =
8inch
 
WORKING
 PROJECT ON PNEUMATIC SHEET METAL CUTTING MACHINE
Fig.  PROJECT ON PNEUMATIC SHEET METAL CUTTING MACHINE
The
pneumatic machine
includes a table with support arms to hold the sheet, stops or guides
to secure the sheet, upper and lower straight – edge blades, a
gauging device to precisely position the sheet. The table also
includes the two way directional valve. The two way directional valve
is connected to the compressor. The
compressor has a piston for a movable member. The piston isconnected
to a crankshaft, which is in turn connected to a prime mover
(electricmotor, internal combustion engine). At inlet and outlet
ports, valves allow air toenter and exit the chamber. When the
compressor is switched ON, the compressed air is flow to inlet of the
pneumatic cylinder.
The
sheet is placed between the upper and the lower blade. The lower
blade remains stationary while the upper blade is forced downward.
The upper blade is slightly offset from the lower blade,
approximately 5 – 10% of the sheet thickness. Also the upper blade
is usually angled so that the cut progresses from one end to the
other, thus reducing the required force.
When the
pneumatic hand operated lever is moved forward, the
piston starts moving in the forward direction. The
upper blade which are then forced against the sheet, cutting the
material. When the pneumatic hand operated lever is moved backward,
the upper blade will come to the original position (i.e., the upper
blade will move upwards).
After
the material is cut, adjust the pneumatic hand lever to the mid
position (i.e., normal position) and then the compressor is switched
OFF. 
 
APPLICATIONS
Sheet metals are
used in
  • Car bodies
  • Airplane wings
  • Medical tables
  • Roofs for buildings
    (Architectural) and many other things
  • Sheet metal of iron
    and other materials with high magnetic permeability, also known as
    laminated steel cores, has applications in transformers and electric
    machines.
  • Historically, an
    important use of sheet metal was in plate armor worn by cavalry, and
    sheet metal continues to have many decorative uses, including in
    horse tack.
 
ADVANTAGES
  • Low cost
  • Less consumption of
    time
  • Easy to handle
  • Skilled labor is
    not required
  • Less maintainance
  • High accuracy
  • Good surface finish
  • Less floor space
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