Vacuum Molding

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.

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.