The document discusses centrifugal casting, which involves pouring molten metal into a rotating mold. As the mold rotates at around 1000 rpm, centrifugal force throws the liquid metal against the mold walls where it solidifies into the final shape of the casting. Common mold materials include steel, cast iron, and graphite. Centrifugal casting produces parts with fewer defects and impurities compared to static casting methods and allows for higher production rates. Examples of components made through centrifugal casting include pipes, bearing bushes, cylinder liners, and pulley wheels.

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CENTRIFUGAL CASTING
Submitted to Prestented by
Mr. Jagtar Singh Parminder
Singh
Deptt of Mechanical Engg
CSE 1
GTBIT,New Delhi
00413202711

2. CENTRIFUGAL
CASTING
In this process molten metal is poured in the mould and allowed to solidify while the
mould 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.

3. PR EQ U ES
ER I STI
 Mould Material
 Steel
 Cast Iron
 Graphite
 Sand
 Rotation Speed of Centrifugal Mould about 1000 rpm
 A Centrifugal Casting Machine.

4. A CENTRIFUGAL CASTING MACHINE

5. 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.

6. 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.

7. 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
metal at 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 low
melting point constituents such as eutectic phases and sulphide and
oxide inclusions. Various theories explain this, one states vibration is
the main cause of banding.

8. APPLICATIONS OF
CENTRIFUGAL CASTING
 Pipes for water gas sewage.
 Bearing Bushes.
 Cylinder Liners.
 Piston rings
 Paper making rollers
 Clutch Plates.
 Pulleys.

9. SOME CENTRIFUGAL CASTINGS

10. CENTRIFUGAL CASTING SET UP
Tundish
Water Nozzles
Mould Roller
Mould Rotameter
Cover

11. POURING OPERATION IN CENTRIFUGAL CASTING
Ladle
Platinum/
Platinum 10%
Molten steel poured
Rhodium
into the tundish
thermocouple