Low Pressure Permanent Mold
Castings
Similar to the Permanent Mold Casting process, the
Low Pressure Permanent Mold Casting process uses a
permanent mold made of iron or steel to produce a
variety of aluminum castings. Instead of using the
force of gravity to allow the metal to flow into the
cavity, a low amount of atmospheric gas or air
pressure is applied to the molten metal, which is
contained in an airtight chamber. This pressure causes
the metal to be forced into the mold cavity. With the
assistance of the added pressure, the metal fills the
mold and compensates for any possible shrinking and
casting defects
Some Advantages of Low Pressure Permanent Mold
Castings:
- Thin walled casting can be produced
- Mechanical properties are increased about 5%
over Permanent Mold Castings
- Excellent process for creating intricate designs
such as circular patterns
- Increased surface finish of as-cast castings
- Higher density castings
- Low tooling costs
- Able to produce pressure tight castings
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