Automatic Die Necker
Machine to effect the necking on one or both ends of cylindrical
welded can bodies in one operation only with equal or differential
necking by means of dies, which have a fixed or expandable
inner part according to technical requirements, used in the
production of aerosol (spray) cans, fruit juice cans and
instant powder cans and ali other type of cans included in
the dimensional range indicated hereunder, which requires
a necking operation with a length up to 19 mm, with a diameter
reduction up to 5.5 mm.
By the die necking operation the can bodies are exactly calibrated
in order to avoid all problems in the following flanging
operation. As there are no parts with high speed rotation,
the machine has a particularly silent running.
The machine is full automatically operated. Can bodies pass
from the inlet gravity runway into the proper seats of the
star conveyors, which take them to the necking station and
then to the knock-out station where the necked bodies enter
the outlet gravity runway by means of proper ejectors.
The motion of the star conveyors is operated by an indexing
device giving them a sinusoidal movement with such accelerations
and decelera- tions as to guarantee the most reduced wearing
of the mechanical parts of the machine. All movements of
the machine are mechanical, operated by widely sized hardened
cams with ground profiles.
The necking dies slide on large cylindrical guides and all
parts in motion are included in sturdy cast iron uprights:
the presence of large doors guarantees an easy access to
the internal parts.
All the cams and the indexing device run in an oil bath and
the cam rolls are provided with high resistance needle bearings.
Furthermore the machine is equipped with a timed safety joint
causing its immediate stop in case of overload of the star
The change-over time to pass from a can diameter to another
is extremely reduced, taking only a few minutes to replace
the necking change parts and the star conveyors. The passage
to another can height takes a still shorter time as only
some quick operations are needed, and is effected by the
help of a millimetric precision rule calibrated on the cutting
height of can bodies.
DRIVE AND OUTPUT:
Motion drive is effected by means of roller chains. In its
standard execution the machine is equipped with a mechanical
variable drive, ratio 1 :5, infinitely variable, operated
by a 3-phase 4-pole asynchronous 1.1 kW motor, preset for
usually employed voltages and frequencies, to be indicated
with the order.
In particular cases the power is increased and al so double
chains can be used, with a corresponding proper overprice.
Should the variable drive not be required, the price of the
machine would be correspondently reduced.
The mechanical speed of the machine reaches up to 120 operations/minute
and the effective speed varies according to the can diameter
to be necked, the necking length, the diameter reduction,
the thickness and hardening of the tinplate.
Mechanical speed: up lo 120 operations/minute.
Can diameter range: 45 mm lo 215 mm.
Can height range: 80 mm to 350 mm (according to the necking lenglh).
Maximum necking length: 19mm.
Maximum diameter reduction: 5.5mm.
Maximum tinplate thickness: 0.32 mm.
Maximum welding overlap: 0.80 mm.
Power driven: 1.1 kW.
Net weight: 920 kg.
Gross weight: 1,025 kg.
Packing dimensions: 165 x 70 x 154 cm.
Seaworthy volume: 1,80 m'.
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