APPLICATIONS This machine
is best suited for small batch production or when cost of press tools
and dies is prohibitive.
It enhances quality and
productivity by doing such lobs which used to be done by skilled men and
hand tools.
The machine has eliminated expensive trimming dies in many modern
workshops. Fabricators, Control panel manufacturers, cabinet 8 vehicle
body makers, fan 8 impeller industry in addition to many others find it
a most valuable asset.
While the capacities indicated
below are for mild steel, the machine is often used for many other
materials as well.
DESCRIPTION
The PARADISE PN series Sheet Metal Nibbling Machine is a rugged,
sturdy and reliable multipurpose machine capable of sheet cuting &
forming operations.
Its versatility is best expressed by terming it
the Sheet Metal Workers lathe.
The working principle on which nibbling operates
is the sheet is cut or formed between the fast reciprocating motion of
an upper tool (powered by an electric motor and driven by an eccentric
crank) and a stationery lower tool, by progressive punching, as the
sheet is fed.
OPERATIONS
1. Shearing tools are available for straight cutting, figure
cutting (contour cutting) a circle cutting operations. The shearing
length per cut is small and there is no wastage materials.
2. Nibbling is a continuous punching operation with a circular
tool and is used for producing internal and external cut-outs of any
shape. The workpiece does not warp but the edges produced may require
filing, depending on the end use. The fixed nibbling tool is solid punch
cutting at one side.
The punch and die clearance is provided to suit the sheet thickness and
the feed is controlled by the tool design. This tool, when used with the
rotary nibbling attachment, enables nibbling in any direction without
sheet.
3. Rectangular notching is a continuous punching operation with a
square punch and die. It is used mainly for producing internal
rectangular cutouts. The tool cuts in the two directions and the edges
produced are clean.
4. Universal nibbling tool consists of a round or square hollow
nibbling punch, a guide pin and die. The nibbling punch cuts on all
sides and with copying complates it becomes a quick and economical way
to produce pa or cutouts of any shape or size. The guide pin controls
the feed rate.
5. Slot cutting is a done with a double-edged cutting tool which
avoids warping of sheets. Suitable for parting of sheets, cutting small
strips and slots. The upper tool has to be changed for each slot width
while the bottom tool is adjustable.
6. Louver cutting is a combined shearing and forming operations,
The sheet is first cut and then the louver is formed with the forming
part of the tool, The length of louvers produced is independent of the
length of the tool.
This operation as well as beading, folding and flanging are completed in
2 to 3 passes. After every pass the tool is fed further towards the
sheet.
7. Beading is a forming operation used: the stiffening of sheets.
8. Folding is also a forming operation and by double folding,
channels may be made for housing of electrical writing etc.
9. Flanging is forming operation very commonly used on sheet
metal parts.0° to 90° flanging is possible by changing the lowertool
only. 2-3 passes are generally required and intermediate annealing may
be necessary in some cases to get the correct angle of flange.
Like all other forming operations, the circle guiding attachment for
straight feeding attachment is necessary for producing circular or
straight flanges. However, a seperate tool which uses the edge of the
workpiece guidance is available for free hand flanging of any shape.
10. Dishing or Peening is a mechanical hammeering operation used
for forming dished parts like tank bottoms. The quality of dishes formed
depends on the skill of the operator.
11. Large hole punching is possible with special punch and die
sets. Round or square holes such as needed for fixing lamps or push
buttons etc on panels are produced on these low tonnage machines by
providing a shear on the punch.
12 Inner circle cutting
Available for circles from 100 mm dia meter up to a maximum circle
diameter upto a maximum size being 80% of throat depth of the
corresponding model chosen.
Pre-hole in the centre is necessary for sheet thickness above 2 mm.
