If you have 8 minutes spare, it is worth watching this clip of the investment casting process
Today most customers supply CAD files
Casting Simulation helps to identify problems and to increase yield and to reduce the required time to perform any design alterations.
A close tolerance wax pattern is manufactured by injecting molten wax under pressure into a tool using filled wax material
Soluble Pattern is used in a wax pattern where undercuts are difficult to produce
This consists of building wax assemblies using runner bars, wax patterns, ancillary feeders, ceramic tie bars etc.
The wax assemblies are coated with refractory slurry and then covered with a refractory stucco to form several ceramic coats.
After the final drying cycle the wax material is removed from the ceramic shell mould by using high pressure dry steam.
Before the ceramic shell moulds are ready for casting they are fired at 1050 C.
The molten metal is poured into a hot ceramic mould using a ladle.
A Roll-over furnace is generally used for pouring smaller hot ceramic moulds up to 50 kg.
When the metal has solidified and cooled to room temperature the ceramic mould material is removed by using a pneumatic knock-out hammer.
Some castings after post casting operations.
The finished cast components are subjected to fluorescent dye penetrant (FDP) detection of surface defects.