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Green Sand for Iron Casting
Green sand casting
process is very suitable to produce
iron castings, such as
gray iron and ductile iron
castings.
Green sand is also called as wet sand, wet clay sand, or moist sand
in China, which use wet clay as the binder. It has some good
properties to be used to produce iron castings.
1. Green sand is cheap
Since clay is rich, and easy available, so its cost is very low.
This is the main reason for many iron foundries keep to use this
casting process.
2. Green sand is recyclable
As for the automatic molding line, the recyclable sand is necessary
to keep the continuous production. By the mature sand preparation
equipments, the recyclable use is reachable. This is the main reason
for most of automatic molding lines to use green sand as the molding
materials. This good property also reduced the production cost to
materials.
3. Green sand has smaller sand size
In order to get better surface quality and smoothness, some
iron foundries will use very
fine green sand, which means the sand size is smaller. Although very
fine sand is not suitable to produce large iron castings, but it is
definitely suitable to produce middle and small castings with higher
surface quality requirements. Of course, fine sand will also reduce
the surface defects, such as sand inclusion, air holes, and sand
slag.
Green sand casting process has been used for thousands years, and it
will still be the main foundry process for producing iron castings.
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