If a small series of parts is needed or there are special material requirements for a prototype, silicon vacuum casting is the fast and economic technique. Transparent and coloured parts, combinations of hard and soft, rubber-like pieces or the overmoulding of parts made of other materials; in vacuum casting there are many possibilities.
Models for design and market studies, for functional and assembly tests or construction verifications. This method allows one to build small series from a master, economically mould.
Preproduction series or small series; typically 5 – 100 pieces
A precise master which is typically made using stereolithography together with a special overflow system is cast into a silicon mould. After hardening, the mould is split and the master is removed. The interior sides of the mould are coated with a silicon spray which prevents the prototypes from adhering to the mould. The mould is closed and placed in the lower chamber of the casting machine. Simultaneously, in the upper chamber, the two components of the resin are evacuated. Those two components are now blended and cast into the mould. The part is finished manually and further surface treatment or professional painting is possible.
Life of a silicon mould: approx. 15 – 25 parts
A very broad range of materials are available to us. Please find below a coarse classification:
- Polyurethanes: mainly thermoplastic properties
- Polyurea: mainly elastomer-like properties
Several vacuum casting installations from MTT Technologies, maximal mould size (in house) approximately 580 x 500 x 450 mm³
4 – 6 working days