Surface finish quality,
surface smoothness of cast iron and cast steel, sand castings made
in China
During price inquiry, many clients were
confused about the surface finish quality, surface smoothness of
cast iron and cast steel castings.
In this article, we will try to show some photos for casting surface
qualities, finish smoothness for lost wax investment castings, shell
molding, automatic molding, resin sand, and manual green sand
casting processes. So, you could understand how about the surface
finish quality our dandong foundry could produce.
This is the surface finish comparator from American Foundry Society.
Although we have not started to use this comparator, I hope to
introduce it just for your reference.
C-9 Micro-finish Comparator shows surface finishes from 20 to 900
RMS
Surface Finish Capabilities by Sand Casting
Processes
|
Casting Process |
Surface Smoothness in RMS |
|
Investment Casting |
50-125 |
|
Shell
Molding Casting |
75-150 |
|
Die
Casting |
90-200 |
|
Lost
Foam Casting |
125-175 |
|
Vacuum
Casting |
150-200 |
|
Nobake
(Resin) Sand |
150-600 |
|
Green
Sand Casting |
250-900 |
Surface quality and
smoothness of iron and steel castings
The following
photos are showing some gray iron, ductile iron and cast steel
castings made by our dandong foundry.
1. Manual
green sand, cast iron castings
traditional
casting process, the surface quality is difficult to control.
Sometimes, good, sometimes, very poor.
2. Resin sand, no-bake sand, cast iron castings
Comparatively good for large iron
castings, but not suitable for producing small iron castings because
of high production cost.
3. Automatic molding, green sand, cast iron castings
Surface quality is not the best,
but quality is very stable. We like it.
4. Shell molding castings, cast iron castings
It could produce better surface
quality than automatic molding, but sometimes not stable.
5. Lost wax investment castings, water glass, steel
castings
The surface quality is much better
than steel castings made by sand casting process.
6. Lost wax investment castings, silica sol, steel
castings
The surface quality is very good,
but its price is about 3 times of water glass investment casting
process. Very expensive.
7. Die casting, aluminum and zinc castings
The surface quality is perfect,
but this process is only suitable for making aluminum and zinc
castings, not suitable for producing iron and steel castings.
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