Creation of pattern:
A two-piece metal pattern generally made up of iron or steel is made in the desired pattern to be used for the process. In case of working with reactive metals graphite is used in the creation of the pattern.
Each piece of the pattern is heated to 175-370 Degree Celsius and coated with a lubricant for ease of removal. The heated pieces are then attached to a dump box which is inverted to coat the pieces with sand and resin mixture. The pattern gets partially cured due to the heat and is then ejected for further process.
The two shell halves are now joined together to create a single mould.This mould is now inserted in to a flask backed up by supporting materials.
This is the step where the completed mould is poured with the molten metal till its filled to the desired levels.
The filled up mould is then left to cool down so that the filled liquid metal can take the desired shape of the mould.
Removal of Casting:
The completely cooled metal which has now taken the desired shape is then removed from the cast.
Application of shell moulding-
This type of moulding is widely used where small or medium-sized precision items are to be manufactured. It is heavily used in the manufacture of components for automotive industry. It is the preferred method for the manufacture of gear rods, cylinder assembly and connecting rods.