FDU FOUNDRY DEGASSING UNIT
E N V I R O N M E N TA L LY
F R I E N D LY M E TA L  T R E AT M E NT
EQUIPMENT & CONSUMABLES
Hydrogen removal
Oxide and inclusion removal
Controlled gassing
Highly efficient rotor designs Reliable and consistent equipment
FDU foundry degassing units are a metal treatment system for the degassing and cleaning of aluminium alloys in foundries.
All FDU units use the impeller principle with patented rotor designs which mixes fine inert gas (usually Nitrogen or Argon) with the melt. The gas bubbles are distributed widely through the melt whilst maintaini
ng a smooth melt surface. This results in short treatment times, effective degassing and melt cleaning.
FDU Foundry Degassing Unit
For the improvement of quality of non ferrous castings
The advantages
n  Reproducible results n  Short treatment time n  R educed gas porosity and hard inclusions in
castings
n  Reduced machining costs
n  Consistent mechanical and physical properties n  Environmentally friendly
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The FDU product range covers a number of machines for transport by crane or fork-lift truck, mobile and static units. The degassing equipment is used for transport ladles and free standing crucible furnances.All machines are custom-made and adapted to foundry’s requirements and needs. An advanced control system enables the operator to program various parameters; the degassing treatment runs automatically without any operator involvement once the process has been started.
A team of Foseco specialists commissions the
equipment and trains the operators.
FDU MARK 10For treatment in transport ladles or furnaces, easily pushed manually into position.
FDU ROTOSTATIV Compact assembly on the ground; a manual arm swivel (optional) provides easy
acces to furnace or transport ladle.
FDU
MINIDEGASSER Compact design for placing on top of a crucible or ladle by means of crane or fork-lift truck.
FDU ROTODRIVE Battery operated trolley for moving into treatment position and for long-distance movement.
FDU
ROTOSCHWENK For assembly on the ground and electrically arm movement for
process automation and multi-position use.
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Graphite shafts
Graphite rotors are used in connection with the corresponding graphite shafts. Various rotor designs and diameters can be combined with shafts in different lengths and types. This procedure provides maximu flexibility to suit almost all crucible and transport ladle designs. Vacuum impregnation of the graphite consumables ensures a long life. n  G raphite shafts
- Ø 45 mm, 700 mm long
- Ø 75 mm, up to 1200 mm long  - Ø 95 mm, up to 2300 mm long
Degassing consumables
For the improvement of quality of non ferrous castings
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Ø 45 Ø 75 Ø 95
INSURAL* baffle plates
A baffle plate is placed near to the graphite shaft and guarantees a smooth melt surface during treatment. It is available in different shapes and lengths.
FDU graphite shaft and INSURAL baffle plate
FDU BKF types of shaft
XSR high-performance rotor
Intensive investigations of the existing rotors, combined with theoretical studies, simulations, extensive modelling and practical tests have culminated in the development of the new XSR high-performance rotor.
The FDU XSR high-performance rotor is an advanced design with an enhanced pumping action.
Turbo cuts in the upper section of the rotor further reduce the size of the inert gas bubbles thus maximising the surface area of the bubbles for a given volume of treatment gas.
Two different foundry requirements can be fulfilled by the new XSR high-performance rotor:
n  Q uicker degassing of molten metal and hence an increase in the effectiveness of the FDU degassing system and a reduction in temperature loss,
n  D egassing at a reduced rotor speed in order to extend the service life of the graphite shaft and rotor because of the reduced abrasion and/or reduction in vortices on the shaft when operating without a baffle plate.The degassing effect has been plotted online
with Foseco‘s ALSPEK* H hydrogen sensor. The
diagram illustrates a typical curve for hydrogen
concentrations in aluminium. The rate of degassing
under consistent test conditions in achieving a
target level of 0.08 ppm of hydrogen in the molten
material was 0.03 ppm H
2
characterise
/min with the XSR rotor.
The degassing rate for the SPR rotor was 0.02 ppm
H
2
/
min, 50% less.
For detailed information refer to Foundry Practice
241 (2004).
SPR
XSR
temp. (°C)
h
y
d
r
o
g
e
n
c
o
n
t
e
n
t
(
p
p
m
)
temperature
treatment time (min)
Development
tests using
water
modelling
XSR rotor
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Rotary degassing of liquid aluminium alloys is a widely used commercial process to control levels of hydrogen, alkali metals and inclusions in the melt, prior to casting. A comprehensive theoretical understanding of the kinetics of aluminium degassing has been established in the past twenty years.
Degassing simulation
Software to analyse batch degassing processes
A selection of different Foseco degassing rotors has been characterised in a comprehensive experimental program. Tests have been carried out in both water model and foundry trials. The study results in an Internet based simulation software for degassing processes in foundries.
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