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the form of spray mist. Minimising
overspray not only improves the quality of
the lacquer finish but also saves wear and
tear on moving machine parts and
reduces the consumption of lacquer.
However, the Sprimag developers were
not satisfied merely with precision. They
also succeeded in making the throughput
times extremely short. The lacquer
coating is made especially weather
resistant, shock and impact resistant by
subsequent baking in a hot air oven.
A round dozen
A unique feature of this solution, not
found anywhere else in the world, is the
interaction of twelve Festo proportional
valves VPPM. Each of the four painting
robots has three valves, each of which
provides a spray function. The first
provides for perfectly metered atomising
air, the second controls the spray jet and
the third precisely regulates the amount
of lacquer material. In comparison with a
single regulator, the Festo proportional
valves VPPM allow considerably higher
control accuracy and more dynamic
Sprimag
Spritzmaschinenbau
GmbH & Co. KG
Henriettenstraße 90
D-73230 Kirchheim-Teck
www.sprimag.com
Area of activity: Manufacture of
automated painting and lacquering
machines for the external coating
of series-produced workpieces
and the internal coating of metal
packaging
The Sprimag lacquering station
at Audi finishes a brake disc.
“Without Festo’s
reliable technology
and great capacity
for innovation, we
could not have
realised the project
in this form.”
Georg J. Langer, Mechanical Design, Sprimag
operation. The overall controlled section
is subdivided into smaller subsections
which can be controlled more accurately
in accordance with task specific
requirements; thus, not only the output
pressure but also the diaphragm pressure
is monitored in the valve. The two values
can be evaluated together, leading to
highly stable and precise control
behaviour.
The Sprimag system delivers lacquer
finishes of consistently high quality. It
requires no set up for changeovers from
one product type to another and reduces
the tubing and wiring in the two identical
lacquering systems at Audi. The twin
systems increase process reliability and
ensure that the manufacturing process is
not interrupted by malfunctions, failures
or maintenance work. At times when
demand is particularly high, both units
are operated together for a higher
production rate.
¢
is
infoservice
21-04
Proportional pneumatics brochure
www.festo.co.uk/proportional