|
q |
Foam patterns offer the opportunity to produce
large, near investment quality castings
1) with net weights to 600
lbs
2) without restrictions on section thickness. |
|
q |
Ceramic cores may be set into foam patterns to
create complex internal geometries and reducing drying times
typically associated with complex parts. |
|
q |
Expanded polystyrene patterns typically weigh 90%
less that a wax pattern. Shell weights using this process are
30-50% less than investment shells. |
|
q |
Reduced lead times for finished products can be
attained because foam patterns are dimensionally stable at
elevated temperatures. . This means that heat and circulating air
accelerate drying of ceramic in the shell building process. |
|
q |
Shells are poured cold. Increased thermal
gradients equal high integrity casting. |
|
q |
The unique polymer binders used in the process
breakdown more easily than typical investment ceramic, making
castings easier to clean and virtually eliminates leaching. |
|
q |
Foam patterns can be molded complete on the ingate
system saving assembly labor. |
| |
. |
|
1) |
Surface finish and dimensional tolerances are
close, but not equal to investment cast parts. |
|
2) |
Heavier castings may be made depending on geometry
and equipment capabilities. |
| |
. |
| |
LINKS: |
| |
|
| 1) |
SlideShow - Tooling Design & Manufacture |
| 2) |
Patterns
-
Tempo Thin Wall Ceramic Shell / Investment Casting Patterns |
| 3) |
Metal Casting Technologies
- Metal Casting Technologies magazine is the voice of the
foundry industry in the Asia Pacific region. |
| 4) |
Waukesha Foundry |
| 5) |
InCast Magazine Article:
March 2007 |
