The wax pattern is produced by injecting wax into a metal die. The wax pattern which is an exact replica of the required part is removed from the die.
The wax patterns are attached to a central wax bar, called a sprue to from a cluster or tree.
The tree is dipped into a ceramic slurry, drained and coated with fine ceramic refractory. After drying, this process is repeated with progressively coarser refractories until a self supporting Shell or mould is formed.
Once the mould is dry, it is heated to allow the wax to run out.
The tree is fired at high temperature to remove all residual traces of wax and preheat mould for pouring.
Molten metal is poured into the heated mould.
After cooling, the material is removed by mechanical vibration or sandblasting.
Parts are cut from sprue, finished, sometimes machined to customer’s specifications and prepared for shipment.