|
Hot
mold centrifugal machine is composed of 4 basic sections that are
cast pouring system, major centrifugal machine, pulling pipe system
and pipe mold and hanger of pipes with self-rotating. And assisting
facilities includes coat preparing system, coat spraying system,
cooling system with water, lubricating system and hydraulic system.
Comparing hot mold centrifugal machine to metallic mold centrifugal
machine cooled by water, there are characteristics as bellow
-
Mold should be pre-heat up to 180℃~280℃
before casting
-
Major centrifugal machine doesn't
need to move horizontally
-
Either short or long slot for casting iron melt can be used
during casting. Foundry ladle moves horizontally on chart.
-
Isolated material (coat material) should be coated on internal
wall of mold before casting. Since eutectic cementite in pipes?
microstructure will be limited to generate as cooling speed of
hot mold is slower than that of metallic mold cooled with water,
it only needs low temperature annealing heat treatment. The
durability of mold will be as many as 10000 times.
-
Since certain time should be spent for spreading and solidifying
of coating material, productivity of hot mold centrifugal
machine of single site will be less than that with metallic mold
cooled with water. For more productivity, it is possible to
enhance productivity by using hot mold centrifugal machine of
multi-working sites.
-
Outlooking of external surface of pipes will be worse than that
from metallic mold cooled with water.
However hot mold centrifugal machine is widely used since:
-
Much more little cost of machine
-
Energy resources cut down effectively
-
Durability of mold
-
Large size of pipes to be produced
|
