FrogSwitch - Manganese Steel Wear Parts

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Vacuum Molding

Vacuum Molding

Our V3 Vacuum Molding SystemSome 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


Step 1

The pattern (with vent holes) is placed on a carrier plate


Step 2

Plastic is drawn onto the pattern by a vacuum.


Step 3

A flask is placed on the pattern and filled with dry, unbonded sand. The sand is compacted by vibration


Step 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.


Step 5

Cope and drag assembly form a plastic-lined cavity. During pouring, molds are kept under vacuum


Step 6

After cooling, the vacuum is released, producing a sand-free, finished product.

Frog Switch Manganese Wear Parts for the Aggregate and Mining Industries