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HOME |
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METAL CASTING - MOLDING |
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Metal castings are used by most people
everyday but very few have any idea of
what they are or how they are made. To
that end we have prepared the following to help
better understand the casting process. |
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Molding - Nobake Sand Molding |
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A mold is made by mixing sand
(reclaimed at SWS) with a three
part chemical binder system.
This molding process is referred
to as a Nobake or Airset System.
Sand foundry molds are made in
two parts, each representing one
half of the part to be made. The
top half is referred to as the
'Cope', the lower as the 'Drag' |
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The sand and binder is mixed in
a dual trough, screw type,
continuous mixer. As the mixed
sand leaves the mixer it is
discharged onto a pattern face
mounted in a mold box. |
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After the mold box has been
filled with sand, it is
compacted to its maximum density
to insure a strong mold for
handing and pouring. After the
mold is compacted, any excess
sand is removed from the top of
the mold box.
Once the sand has 'set-up', the
pattern is removed from the sand
in a Rollover/Draw machine. The
mold is then 'Flow Coated' to
improve casting surface finish.
After the Flow Coating material
has dried, cores are placed in
the Drag portion of the mold.
The mold is then closed by
setting the Cope on the Drag.
Once closed, the mold is moved
to the pouring lines. |
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