The finished article may be given a final finish

　　Vacuum casting is an ideal process for low volume production and prototyping. While it is feasible for an industrial unit to install the line of equipment's Outer Rotor Axial Cooling Fan needed for vacuum casting the process is better outsourced. There are quite a few reasons why outsourcing this process is important for industry. However, an understanding of the process gives a better idea about why such services are important. The Vacuum Casting Process A model of the component is prepared using traditional stereo lithography process with CNC machines from a drawing. The model is then given a finish as may be desired. Then silicone resin is used to create the mould. The mould is suspended inside a vacuum chamber and filled with polyurethane resin and cured under temperature and possibly pressure.

The finished article may be given a final finish. It appears simple but there are complexities at each step, reasons why vacuum casting services play an important role for industries looking to develop new components or source low volume components. The CAD drawing The master model is prepared from a CAD drawing. Engineers and drafts who prepare the CAD drawing may not be aware of the practical aspects and how design may influence strength or stability of parts. Experienced vacuum mould casting professionals know characteristics of various polyurethane moulding compounds and can recommend changes in drawing that will result in lower use of material or better strength or both. This can save considerable time, effort and money. Making the Master Model This involves the use of CNC and other equipments that a company may not possess.

It may not have technicians with specific skills in machining models. Even they do have machinery and people, it may not be economically practical since they may need only a couple of such models per month. On the other hand service providers have the entire line of equipments and skilled technicians for speedy development of master model. There is more to it than just dimensional accuracy. One must also factor in shrinkage, for example. This depends on properties of the polymer chosen for vacuum casting. The Silicone Mould This is another critical phase where technical expertise blends with art. The mould maker creates the two part silicone mould with precision, layering silicone until it is just right for the component to be vacuum cast.