Shell Moulding

Shell Mould Casting is a process by which molten metal is gushed into matrix of thin walled shell pair. This pair is made up by applying Sand-Resin around a heated Metallic Pattern.

There are series of steps such as:

• Preparation of Sand and Resin Mixture into a Dump Box
• Pattern Creation by using half slit metallic pattern with flat surface and heated thereby placing the lid of Dump Box with this fixed heated pattern.
• The lid is placed on the box containing the mixture which inverted upside down to allow the sand to cover the mold. As the mixture touches the lid , some sand granules get stick to the lid. As we reinvent the box, the unstuck granules we shifted down to the surface of the box. This causes the stuck sand to form a shell over the mould.
• Assemblage of Mould results in safely removing the shell from the mould. Another shell is created with the same process. These two shells are joined together which forms a cavity. The shells are placed into a box again and the outer surface of box is filled with sand.
• The Cavity of the shells inside the box is filled with molten metal using a ladle.
• The Molten Metal is allowed to settle for sometime where it gets settled and is solidified with the shells.
• The Casting is removed by turning the box upside down where the sand falls down and we get the desired shell pattern. This mould is removed from the shell where we get the desired casting.