Moist bonding sand is packed around a pattern. The pattern is removed to create the mould and molten metal poured into the cavity. Risers supply necessary molten material during solidification. The mould is then broken to remove the part (Figure 3.1(a)).
Figure 3.1(a) Sand Casting.
Most metals, particularly ferrous and aluminium alloys. Some difficulty encountered in casting: lead, tin and zinc alloys, also refractory alloys, beryllium, titanium and zirconia alloys.
• Green sand casting: the most common and the cheapest. Associated problems are that ...