Flywheel Castings made in China
Flywheel is a kind of accumulator with
wheel shapes, which is installed on the rotating shafts of machines.
It relies on a large rotational inertia to maintain the smooth
rotation of engines.
When the speed of machines increases, the kinetic energy of flywheel
increases, the kinetic energy will be stored. When the speed of
machines decreases, the kinetic energy of flywheel will be reduced,
then the energy will be released. It uses the energy of motion to
overcome the resistance of the other parts, make the crankshaft to
It is used in machines, cars, bikes, etc. Flywheels are usually made
by grey iron ASTM A48 CLASS30 and
CLASS35, and ductile iron ASTM A536
65-45-12, 70-50-05 and 80-60-03.
Grey iron flywheels have good castability and wearing resistance,
moreover, grey iron cost is cheaper than ductile iron, or called as
Ductile iron flywheels have shock resistance, corrosion resistance
and it is very strong, non-deformation, non-easily crack, so its
life time is long.
Flywheel assembly is important part of engines. It consists of the
flywheel, gear ring, clutch positioning pin, and bearing etc.
Flywheel should not have those serious
iron casting defects,
such as cracks, sand holes and shrinkage, the work surface should be
smooth and clean, flatness tolerance should be less than 0.1 mm,
otherwise, flywheel should be repaired or replaced.
In China, we usually produce flywheel castings by
automatic molding line
to meet the high demand and technical requirements. Most of flywheel
castings do not need sand cores, so most of
iron foundries could
produce them by high production rate. For now,
sand casting is still the most suitable production
process for flywheels.