A green sand mold is formed by packing a mixture of sand, clay and water
around a pattern to form a mold cavity. The pattern is removed and molten metal is poured
into the mold cavity through the sprue. |
A permanent mold consists of two steel/iron halves in which the mold
cavity has been machined. For gravity feed, molten metal is poured in the mold cavity
through the in-gate |
A low pressure permanent mold uses 3-15 psi of gas pressure to push the
molten metal from a furnace up into the cavity of the two-piece steel mold. |