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CENTRIFUGAL CASTING
00413202711
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C E N T R I F U G A L
C A S T I N G
In this process molten metal is poured in the mould and allowed to solidify while themould is rotating. Metal is poured into the centre of the mould at its axis of rotation.Due to centrifugal force the liquid metal is thrown out towards the periphery.
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PREREQIUSTIES
Mould Material
Steel
Cast Iron
Graphite
Sand
Rotation Speed of Centrifugal Mould about 1000 rpm
A Centrifugal Casting Machine.
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A CENTRIFUGAL CASTING MACHINE
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PROCEDURE
1) The Mould wall is coated with a refractory ceramic
coating (applying Ceramic Slurry , spinning, dying ,
baking).2) Starting rotation of the mould at a pre determined
speed.
3) Pouring of Molten metal directly into the mould (no
gating system is employed).4) The mould is stopped after the casting has been
solidified.
5) Extraction of the casting from the mould.
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CHARACTERISTICS OF CENTRIFUGAL CASTING
1) The casting is relatively free from defects.2) Non metallic impurities which segregate toward the bore can be machined off.3) Less loss of metal in tundish compared to that in gating and risering in
conventional and sand casting.
4) Better mechanical properties.5) Production rate is high.6) Can be employed to manufacture bimetallic pipes.7) Centrifugal casting process can be used for fabricating functionally gradient
metal matrix composite material.
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DEFECTS IN THE CENTRIFUGAL CASTING
Conventional static casting defects like internal shrinkage, gas porosity
and nonmetallic inclusions are less likely to occur in centrifugal casting.
Hot Tears Hot tears are developed in centrifugal castings for which
the highest rotation speeds are used. Longitudinal tears occur when
contraction of casting combined with the expansion of the mould,
generates hoop stresses exceeding the cohesive strength of the metalat temperatures in the solidus region.
Segregation - Centrifugal castings are under various forms of
segregation thus pushing less dense constituents at centre.
Banding
Sometimes castings produce zones of segregated lowmelting point constituents such as eutectic phases and sulphide and
oxide inclusions. Various theories explain this, one states vibration is
the main cause of banding.
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APPLICATIONS OFCENTRIFUGAL CASTING
Pipes for water gas sewage.
Bearing Bushes.
Cylinder Liners.
Piston rings
Paper making rollers
Clutch Plates. Pulleys.
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SOME CENTRIFUGAL CASTINGS
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Mould Roller
Mould
Cover
Rotameter
Water NozzlesTundish
CENTRIFUGAL CASTING SET UP
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POURING OPERATION IN CENTRIFUGAL CASTING
Ladle
Molten steel poured
into the tundish
Platinum/
Platinum 10%
Rhodium
thermocouple
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