The Process of Vacuum Casting
Vacuum casting is a dependable and flexible process, capable of
accommodating the development of complex designs. It's frequently
used by companies for producing prototypes and other end-user
product. For an excellent outcome in the casting process, it
requires a high-quality master prototypical pattern.
Casting models are mostly created through stereolithographic, a
form of 3D printing technology used for creating models,
prototypes, patterns, and production parts in a layer-by-layer
fashion using photopolymerization. It's important for the master
model to be of high quality and perfectly designed, it will only
transfer any flaws in the model to the final product or prototype.
Using of high-end urethane casting service makes sure the model
master in the picture is as it is in the first step towards a fine
final product.
Once the model is well designed and got, it's inserted inside a
two-part silicone mold and subjected to some very high
temperatures. It cures after which the model and silicone mold is
opened in a symmetric way. It creates a hallow area within the
model exactly like the master model. The mold is then placed well
inside a vacuum chamber hence the name vacuum casting.
While inside the vacuum chamber, they fill the required amount of
material into the mold. The commonly used material for vacuum
casting is urethane. Urethane casting is perfect for replicating
design models, matching the needed characteristics for industrial
grade material like glass- filled nylon, polycarbonate, and
high-density polyethylene.
Upon filling the mold with urethane, so-called urethane molding,
it's sealed. This is done using a high- intensity vacuum, to ensure
they leave no air molecule inside. After the casting process, they
open the mold, they can paint the prototype or produce as per the
recommendation.
How to Make a Perfect Master Pattern or Design
There two methods of getting a perfect model or design for your
vacuum casting. One way to consider is CNC technology. This can
provide parts of the highest accuracy, placing tight tolerance such
as +/-0.05mm. But it takes longer to process, unlike SLA. The other
way of getting a master pattern is the SLA. It's faster
particularly on complex design or patterns, it's also easily
combined in all internal 3D CAD input features.
