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35-60 days

V-process casting line (vacuum molding line)

V-process casting line (vacuum molding line)



This machine is designed and made by our company.It's a  Patented Product. It has good functioin like a complex molding line.

It can make different castings which fit for the v process.


This product's Advantages are as following:
1.High Accuracy-Net Shaping
high dimensional accuracy and low machining allowance save cost to a great degree.Zero draft and thin-wall capabilities which can also save lots of cost.
Low coarse improve tired life and assembiling accuracy. If controlled well, V process casting surface quality can be good as investment casting.
3.High quality-little/noum flaw and low foundry stress.
For thin wall cast steel casting with complicated structure.V process casting offers better solution than resin sand and sodium silica sand comparing all factories.
4.Low cost-request of market competition
Dry sand no binders, sand circulation easily and little waste;low labor strength lead low labor cost; low wear make pattern cost low; low environmental cost.
5.Environmental-request of modern industrial
No harmful gas and wastes;dust from dry sand and noise from vacuum pumpare main pollutionfactors, but easily controlled. Investment for environmental enquipment will be low in the future foundry shop.
6.Low labor strength
Molding stripping and shaking out easily


Technology process


1.The pattern is fasterned to a hollow pattern carrier. The pattern has numerous vent holes around the edge of the pattern and other critical areas. These vent holes are directly connected to the vacuum chamber of the carrier.When the vacuum chamber is placed under a negative pressure, air will be drawn down through the vent holes and into the vacuum system.

2.A plastic film about the same size as the pattern carrier is heated until it becomes soft. This film is 0.04mm to 0.18mm thick with good elasticity and a high plastic deformation ratio

3.Once the film has softened, the vacuum suction is applied to the pattern carrier. The softened film is draped over the pattern,and the suctioin, acting through the vents, draws the film dowm, finally the film adheres closely to the pattern.

4.With the vacuum suctioin still applied to the pattern carrier, the flask is placed in position around the pattern on the top of the plastic film.Note that the flask is a double wall construction and that the flask walls screened vents to permit air to be sucked into the vacuum chamber. Large flasks will have hoses across the flask, also connected to the vacuum chamber.

5.The flask is then filled with dry, unbounded sand, and vibrated to compact the sand to maximum density.

6.The top surface of the mold is then covered with plastic film.It may not be necessary to soften this piece of film. The figure illustrates a cope mold, with the piring basin being formed by hand and connected to the down sprue. A drag mold requires only a leveling operation prior to placing film.

7.Vacuum is then applied to the flask, and the vacuum is released from the pattern carrier.Atmospheric pressure then hardens the sand in the mold, retaining the shape of the patter.The mold is then stripped from the pattern.

8.Both cope and drag molds are made in the same manner. The cope is closed on the drag and the two section clamped together.The entire cavity is plastic-lined. The mold is then poured. During pouring, the molds are kept under vacuum.

9.After cooling, the vacuum is released, the sand and castings fll out without shaking or vibration.There are no sand lumps and little or no burn-in. The sand is cooled and return to the system for reuse. At last , the casting is removed for cleaning.

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