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Vacuum Casting

Vacuum Casting



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Vacuum CastingVacuum casting

Vacuum casting is the process of using a ventilated mold. The molten metal flows into the mold by means of air pressure, then clear the air to form a vacuum.Vacuum casting is a low-cost but reliable method for making a small number of high -quality prototypes based on a master model. This method is ideal for rapid prototyping used in engineering testing, proof-of-concept and display demos to name a few. At Kang Ding, we have a dedicated team of mold makers who are experts at
Creating vacuum casting molds which offer fine surface details while being robust enough to make up to 50 copies per mold with short lead times.

What Is Vacuum Casting?

Vacuum casting involves making a mold out of silicone rubber, vacuum modeling is a physical modeling method, it combines vacuum technology with sand casting,usually based upon a master model created by CNC machining or one of our
prototyping manufacturing services.

Advantages Of Vacuum CastingAdvantages Of Vacuum Casting

Vacuum casting is an ideal choice for
prototyping manufacturing because:
      Low manufacturing costs
      Large process flexibility
     You can get complex shapes and large castings,
     There is a low initial cost since it does not require investment in tooling
     The high fidelity of the lighting gives excellent surface details ask little or no post-processing
     Many different molding polymers are available that can be pigmented to meet your color requirements
     Molds can be ready in a few days once the master model has been created
     Molds are durable up to 500 copies so it's great if you need more than one copy
     We provide overmolding, so that different types and hardnesses of plastic can be molded together into a single unit
     It is an excellent option for testing multiple variations of a prototype design for rapid product development
    Degree of vacuum, mold cavity compactness, casting quality is also high.
    Vacuum casting with the computer simulation of the flow simulation, can predict the generation of casting defects, for the design of the design program, can significantly save time and improve production efficiency.

Vacuum Casting Process

Stage One: Making the Master MoldVacuum Casting Process
Our company uses the V method modeling, VRH process modeling, V2EPC process casting, and these three vacuum casting process through continuous improvement, development has been fully adapted to the actual situation of the world.

  • First, a solid master model or pattern is required.  This can be made of any stable material, and can either be supplied by you or alternately created by Kang Ding using our via CNC machining.   
  • Typically master patterns are made in plastic or metal, the only requirement being that they are able to withstand a temperature of 40° C for an extended period of curing.   
  • We then suspend this pattern inside of a casting box, which we half-fill with liquid silicone rubber.  This is placed inside of a curing oven and heated at 40° C until the silicone is fully cured.   
  • The casting box is then filled with additional silicone liquid which is also heated and cured.  The two halves are treated with a releasing agent for later separation.   
  • Once fully cured, the silicone rubber mold is opened up along the parting line and the original master removed.

Stage Two: Making the metal Parts

  • During mold making, our craftsmen strategically place a series of fine holes surrounding the master pattern.  These holes will be used to later draw air pressure out of the mold.   
  • The mold is placed in a closed container, out of the mold inside the air, so that the mold caused a certain negative pressure, leading to metal inhalation mold cavity. when the casting of the inner runner solidification, remove the negative pressure, so that the runner without solidification of molten metal back into the pool.   
  • We can fill this cavity with any number of molding polymers to suit your design requirements. Once the cavity is filled, it’s placed into a vacuum chamber which draws air out of the cavity and pulls the liquid plastic into all of the recesses of the mold, ensuring an exact conformity to the original shape.   
  • Finally the mold goes into a curing oven one more time, creating a solid and stable replica of your original master pattern.
Casting Tolerances

The finished dimensions of vacuum cast parts is dependent on the accuracy of the master model, part geometry and casting material. In general, the minimum wall thickness of the cast cast is up to 0.2 mm and the casting area is 300 mm2,  a shrinkage rate of 0.15% is to be expected.

Casting Materials

Hundreds of casting polymers are commercially available to reproduce any conceivable hardness and surface texture.  It is also possible to make parts that are fully opaque, translucent or completely transparent depending on your application. Casting with the main material is cast steel, cast iron, cast nonferrous alloys (copper, aluminum, zinc, lead, etc.) and so on. See more information on available materials.

Casting Surface Treatment Services

At Kang Ding, we provide a range of surface treatment services to ensure the part meets your expectations. Our post-processing methods include sanding, painting, polishing, aqua blasting, drilling, plating, tapping and threading holes, pad printing, silk screening and much more. We also have a team dedicated to quality control and inspection and we pride ourselves on being ISO certified.

Are You Ready To Start Your Next Project?

We’re proud to say that our vacuum cast parts have helped to pave the way towards full-scale production on many successful and famous products used in commercial, industrial and scientific applications around the world. We OMOM@ work mode must provide you with the opportunity to open up the market. We’re confident we can meet and exceed your expectations just as we’ve done for thousands of customers before. Contact us today for a free design review and quotation.

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