“As cast” – parts removed directly from the mould have a surface finish equal to or better than 0.8 micrometres (32 micro inches); this finish may show variable colour.
Removes any sharp edges left after linishing, leaving a surface suitable for most subsequent “finishing” processes.
Using stainless steel shot, is generally suitable for brass components and gives a slightly polished surface.
Glass Bead Blasting
Produces a more highly polished surface finish and is most suitable for aluminium parts.
Special Surface Effects
Such as textures and knurling can be incorporated within the Sylatech casting process.
Automatic Grit Blasting
Gives a uniform matt finish, suitable for most subsequent finishing operations.
Applied Surface Treatments
The following treatments can be applied:
Alocrom1200/1000 / Chromate Conversion
Surtec 650 Roche complaint processes which provide corrosion resistance to aluminium parts whilst providing an electrically conductive surface.
For protective purposes can be carried out on aluminium alloy castings but cast alloys do not readily accept decorative anodised finishes due to the silicon content.
Can be applied to most alloys.
Hipping (Hot Isostatic Pressing)
Is used to improve the mechanical properties of aluminium castings by sealing internal voids.
Can be carried out on “as cast” or machined parts where pressure tightness is essential.
For protection or visual purposes.
Various heat treatments can be applied to harden components. This is carried out generally to aid subsequent machining and enhance component stability. Suffixes to the material grade are used to denote the heat treatment carried out: UK and equivalent USA and EN suffixes are shown below: