SMOOTH MOVES:
SAND’S IMPACT ON SURFACE FINISH
Different types of sand molds and cores used by your supplier will impact the surface fi nish of your castings.
AN MCDP STAFF REPORT F
or many casting buyers, a smooth, uniform surface fi nish is more than a visually appealing bonus. It can be a sign that the casting sup- plier has produced a high quality component. Perhaps more importantly for the casting buyer, a proper surface fi nish can lead to even- tual cost savings in the cleaning, fi nishing and machining of the part.
Castings produced in sand molds can have relatively smooth surfaces, but if need be, the baseline surface finish can be improved through various means, though such gains will come with additional costs. Discussions with casting suppliers can help buyers understand potential solutions and associ- ated costs.
Sand Selection & Other Variables
T e surface fi nish of your cast
components depends greatly on the type and quality of sand used in the casting process. T e sand’s manipulation and makeup are vital considerations. Your potential sup- plier invests time, money and eff ort in ensuring these materials are being used to their greatest potential. T e method of compaction in sand molding infl uences surface
Fig. 1. AFS’s C-9 Microfi nish Comparator shows surface fi nishes from as smooth as 20 RMS to as rough as 900 RMS. 42 | METAL CASTING DESIGN & PURCHASING | Jan/Feb 2016
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