SAND CASTING

The manufacturing process of sand casting allows the production of both a series of products or a singular production with weights that can vary from a few grams to many tonnes.

The casting technique consists mainly in preparing a cavity called a “mould” which is a copy of the negative of the piece being made. The alloy is poured in its cast state. Once it has solidified, the alloy is extracted from the mould in its unrefined state.

It is very similar to the final piece but lacks some machining allowances (the parts to be taken away by the machine tools so that functional surfaces can be made). The sand casting (or green method) can only be carried out once and is destroyed after the unrefined form is extracted (see diagram).

Benefits:

  • production versatility;
  • economical;
  • possibility of creating complex shapes;
  • possibility of using different alloys (ferrous or non-ferrous);

Range of typical roughness for production process (expressed in RMS unit): 560 < RMS < 900