Presentazione di PowerPoint

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New Entry in GRID MAKING SYSTEMS the ROTARY
CASTER
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Sovema has always been at the forefront in the
many systems for producing grids as a support for
the active material. Up to date we have
dedicated our work to systems for producing
grids of the most highly evolved type, applied
in the production of SLI batteries, in the
maintenance free range and, as of VRLA
batteries, in the AGM and GEL range. 
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For these products we developed three particular
techniques expanded metal with the use of
the Performer expander, developed and patented
by Sovema.
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the punched grid with pressing system, already
tested by Sovema.
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the rotary puncher.
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The above-mentioned systems require a lead strip,
that is used for expanding or for punching and
this strip must have the right crystal structure
to provide the best performance in terms of
resistance to corrosion and growing.
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For this purpose Sovema has developed special
systems for casting thick strips, suitable to
be subsequently rolled, as to obtain the
optimum crystal grain.
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These systems, as well, required an
in-depth study and designs, that are covered by
patents.
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This technological evolution isnt involving
those customers, who manufacture flooded
and/or low maintenance batteries, that are
mainly produced with alloys at variable antimony
content. For these batteries the grid caster with
book mould system, suitable for both positive
and negative grids, is still widely used.
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However, as youre aware, this system is
very dated, it gives low productivity and
requires big investments in the casting
departments, both for equipment and manpower.
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Now, Sovema is able to supply a new machine,
specific for the production of this type of
grids, providing higher efficiency and improved
quality
the ROTARY CASTER
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This machine has a cooled wheel, on which
surface a series of grids is engraved. A system
for feeding the lead alloy fills in the
engraved pattern and when it solidifies, a
lead strip composed of a series of grids,
inter-connected by frames, is created.
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A cooling and extraction system completes the
grid production.
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The operating principle used on this machine is
widely known, but the result is a grid with
very poor crystallography, with crystals that
are not homogeneous and some of them very large.
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The crystallographic problem means that the
known principle is currently used in the
production of negative grids only, since it
cannot provide a sufficient resistance to
corrosion for the positive grids.
In the machine we propose, the crystallographic
problem is resolved with the introduction of
an ultrasound generator with controlled frequency
and capacity, that makes it possible to
control the crystal generation and to define
their dimensions.
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The new ultra-sonic device (directly immersed in
the molten lead) acts as a generator for
starting the crystal formation process, hereby
affecting their density and their related
dimensions.
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By this latter innovation (patent pending),
applied to the known system, Sovema resolves to
greatly improve the performance of the grids thus
produced, so that they can be used as positives
in the low maintenance batteries.
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Finally, the new Rotary Caster is proposed as a
machine with the following features  - high
production output (approx. 400 grids/min.) -
completely automated - reduced maintenance -
suitable for the use of both Pb/Sb and Pb/Ca
alloys - able to produce plates for dry-charge
batteries - able to produce grids of any
thickness.
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In conclusion, any type of battery - lead
antimony - low maintenance - maintenance free can
be produced with the SOVEMA ROTARY CASTER.
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