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TPi Arcade, Inc.
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V-Process Aluminum Casting Overview, Features and Service

Overview: How the V-Process Works

Final Design to Casting in 2 weeks
Step 1: The pattern (with vent holes) is placed on a hollow carrier plate.
Step 2: A heater softens the .003" to .008" plastic film. Plastic has good elasticity and a high deformation ratio.
Step 3: Softened film drapes over the pattern with 200 to 400 mm Hg vacuum acting through the pattern vents to draw it tightly around the pattern.
Step 4: The flask is placed on the film-coated pattern. Flask walls are also a vacuum chamber with the outlet shown at right.
Step 5: The flask is filled with dry, unbonded sand. A slight vibration compacts sand to maximum bulk density.
Step 6: A sprue cup is formed and the mold surface leveled. The back of the mold is covered with unheated plastic film.
Step 7: Vacuum is applied to the flask. Atmospheric pressure then hardens the sand. The vacuum is released, pressurized air is introduced into the carrier and the mold is stripped.
Step 8: The cope and drag assembly form a plastic-lined cavity. During pouring, molds are kept under vacuum.
Step 9: After cooling, the vacuum is released and free-flowing sand drops away leaving a clean casting, with no sand lumps. The sand is cooled for re-use.

V-Process Casting Features and Service

Zero Degree Draft Benefits:
Reduced machining time,
Thinner and consistent wall thicknesses,
Reduced overall part weight.

Unlimited Pattern Life:
Guaranteed for the life of the project,
Quick and easy tool modifications.

Tight Tolerances:
+/- 0.010”(0.25mm) for the first 6”(152.4mm),
add 0.002”(0.05mm) per inch thereafter,
add +/- 0.020”(0.508mm) across parting line.
Surface finish 125-150 rms.

Thin Wall Sections:
Standard wall thickness of .125”(3.175 mm),
Thinner wall sections are achievable in isolated areas.


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