|
 |
|
|
|
Vacuum Molding
|
Vacuum Molding
Some key benefits of vacuum molding include:
- Casting-to-casting consistency
Exact duplication of customer requirements for large castings
- Environmental soundness
No chemical additives, low noise level, and no energy required to mix the sand
- Superior casting quality
Excellent dimensional accuracy and a smooth, clean finish on all castings
- Zero pattern wear
Because the sand never touches the pattern
Our V-3 (at right) is the largest vacuum molding unit in the world.
Vacuum Molding Production Process
1. |
 |
The pattern (with vent holes) is placed on a carrier plate |
2. |
 |
Plastic is drawn onto the pattern by a vacuum. |
3. |
 |
A flask is placed on the pattern and filled with dry, unbonded sand. The sand is compacted by vibration |
4. |
 |
A second sheet of plastic is placed on top of the sand and a vacuum is applied to the flask. Atmospheric pressure then hardens the sand retaining the shape of the pattern. |
5. |
 |
Cope and drag assembly form a plastic-lined cavity. During pouring, molds are kept under vacuum |
6. |
 |
After cooling, the vacuum is released, producing a sand-free, finished product. |
|
|
|