How to produce small iron castings
In the past, we have talked about how to
produce large iron castings,
so now, we will talk about some about how to produce small
As for small iron castings, we meant
gray iron and nodular iron
castings with weights less than 2kg.
It is not an easy thing to produce small iron castings, so there are
many iron foundries would not like to produce them. The main reasons
are because they are too light to reach a large weight volume, and
too many pieces will cause very large cleaning and grinding works.
So, small iron castings will be more expensive relatively.
Then, what kind of iron
casting factory or what production process are suitable to
produce small castings?
1. Investment casting workshops
Lost wax investment casting
process is suitable to produce small
metal castings, from 0.1kg
to several kgs, however, most of investment casting factories in
China are producing steel castings,
not iron castings, but still some factories could produce iron
castings by this process.
Investment casting process is suitable to produce small iron
castings since they could reach better surface quality, high
dimensional tolerance of rough castings, and less sand residues.
2. Shell molding process
Shell molding process is
also called as hot shell and core molding process, or
pre-coated resin sand casting
process. This process could reach similar surface quality
and dimensional accuracy as lost wax casting process, and because
its own characters, it is suitable to produce small cast iron parts.
There are many small and middle sized
iron foundries in China who are using this process to
produce iron castings, but seldom to use it to produce steel
castings. According to our clients, there are many steel foundries
have abandoned the investment casting process, and using shell
molding process to produce small steel castings. The pollution of
investment casting process is one reason, the other reason is shell
molding could reach higher production rate.
Few iron foundries in China could produce small iron castings by
manual green sand
casting process or by molding machines. The followings are
some small cast iron parts made by Dandong Foundry.