select iron casting process?
The most common
iron casting process is
casting, followed by
special casting methods, such as
metal mold casting,
plaster casting and so on. The
sand casting process can be divided into
organic binder of sand,
resin sand and
lost foam etc.
Casting selecting principle:
First, give priority to using sand
According to statistics,
sand casting has taken about 60%
to 70% of the total casting production,
and about 70% of which is
green sand casting.
Mainly due to low cost of sand casting
than other casting methods, its
production process is simple, and has
short production cycle. So as the car
engine cylinder block, cylinder head,
crankshaft, etc. are produced by green
sand casting process.
When the green sand can not meet the
requirements and then you could consider
the use of
dry sand or other sand. The
weight range of
green sand casting is from
several kilograms to hundreds of
kilograms, while the production of dry
clay casting can weigh several tons.
In general, for medium and large
castings, you choose
self-hardening resin sand. As for
castings, you could choose the
water glass sand. This can get
accurate dimensions, smooth surface of
the castings, but the cost is higher.
Of course, as for the sand castings, the
accuracy, surface finish, material
density and microstructure, mechanical
properties are very general, not very
high, so when castings have these higher
performance requirements, you should use
other casting methods, such as
investment casting (lost
low pressure casting and so on.
Second, the casting process should be
suited to annual demand
sand casting process, for large
volume production, you could choose the
automatic molding line.
Old-fashioned shock or shock-type
compression molding machine production
line productivity is not high enough,
workers in labor-intensive, noisy and
does not meet the requirements of mass
medium-sized castings, they are
usually too large for automatic molding
line, so you can choose
high-pressure molding machine.
large-sized castings, you could
resin sand molding process, which
could get better quality.
As for the small batch production of
heavy castings, hand-shape is
still an important way to adapt to a
variety of complex shapes.
Low pressure die casting, die casting,
centrifugal casting and other casting
methods, because of equipment and
tooling is expensive, so only suitable
for mass production.
Third, considering the production
cost and dimensional requirements
Various casting processes have different
dimension precision, and different
initial investment and productivity,
therefore, the economic benefits are
also differences. So you should consider
all its aspects to determine the high
economic benefits and the high casting
requirements, but ensure that the
casting process is applicable.