Vacuum Casting - Urethane casting
What is Vacuum Casting? Vacuum forming is used to create duplicate prototypes and models. We start by producing a piece (know as a master model）using CNC machining, and then a silicon rubber mold is made via vacuum casting to produce accurate duplicates of the original piece.We go through an extensive process to ensure that each piece we produce is of the highest quality, and meets the impeccable needs of our customers. Prototypes we make through this method are best suited for engineering testing, concept proofing and display demos.
End Use Parts Quality At Low Volumes
Vacuum casting provides rigid or flexible plastic parts for both prototype and end use parts, Typically, each silicone mold can make 20 parts.
You do not have to invest in expensive and time-consuming tooling, vacuum casting provides high level of details, color and finishing.
Vacuum casting parts are shipped within 15 working days or less, depending on parts specification and volume.
Vacuum Casting Applications
Appearance model, market testing, investor pitches, and trade shows
Prototyping range or small series of housings and covers
Low volume production, bridge the gap from prototype to production.
Vacuum Casting Material
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. See more information on available materials.
Vacuum Casting Process
|Step 1:Master building||Masters are 3D solids of your CAD designs. They are usually made by CNC machining or with 3D Printing. Making Master in 40° temperature. After finish and inspect the masters, we will move to silicone mold making.|
|Step 2: Mold making||Casting molds are made from liquid silicone. Half-Fill the casting box with liquid silicone, Heat the casting box until silicone is fully cured and then allowed to cure in an oven for 16 hours. Fill with extra silicone liquid which is also heated & cured. Once dried, the mold is cut open and the master removed.|
|Step 3: Make the parts||Poured the casting resins into the empty cavity to create a highly accurate copy of the original. It’s even possible to overmold with two or more materials. Silicone molds are typically good for 20 or so copies of the master pattern.|
Vacuum Casting Technical Specifications
|Typical lead time||Up to 20 parts in 15 days or less, depends on the part specification and volumes.|
|Accurate||± 0.3% (with lower limit on ± 0.3 mm on dimensions smaller than 100 mm)|
|Minimum wall thickness||To ensure that the mold is filled properly, a wall thickness of at least 0.75 mm is necessary. For best results, we recommend a wall thickness of at least 1.5 mm|
|Maximum part dimensions||The size of the mold is limited by the dimensions of the vacuum chamber (1900 x 900 x 750 mm) and by the volume of the product (maximum volume: 10 liters)|
|Typical quantities||Up to 25 copies per mold (depending on the mold’s complexity and the casting materials)|
|Color & Finishing||Pigment is added to the liquid polyurethane prior to casting, custom painting and texture.|