Sand Casting Vs Shell Moulding

Sand Casting Vs Shell Casting

Sand Casting	Shell Moulding Casting
1) Mould is made from sand, clay, moisture, binders and additives.	1) In the shell moulding process clay and additives are not used mixture of sand and thermosetting resin is used to make sand-resin mould.
2) Metal pattern is not heated to cure sand, clay and moisture to form sand mould.	2) The metal pattern is heated after pouring fine sand and resin together.
3) Dimensional accuracy and section thickness of casting are less than shell moulding.	3) Dimensional accuracy, edges and section thickness of casting are better than sand casting.
4) Sand casting process requires more foundry floor space for making mould, casting and curing sand moulds.	4) This process requires less foundry floor space.
5) Silica sand used in this process is reusable, environmentally friendly and cost-effective.	5) The same sand used is mixed with resin and cured. Practically it is difficult to recuse and recycle as sand is not environmentally friendly.
6) The permeability property of sand during the casting process is slowly increasing gas defects.	6) The permeability property of sand during the casting process is high exhausting all gases and vapours from the mould and reducing gas defects.
7) Mouldmaking is time-consuming and reduces the productivity of the foundry to produce casting in large volumes.	7) Shell moulds can be produced at a faster rate on the machine with the heated metal pattern.