Shell-Moulding

Shell-moulding is a process in which a thin shell is produced, by bringing a mixture of sand and a thermosetting resin into contact with a heated pattern.

When a sufficiently thick shell has been produced, the shell is finally cured (backed up by sand or steel shot in a moulding box). The subsequent casting process is then the same as for normal sand-casting. The advantages of shell-moulding over conventional sand-casting are:

• It can be semi-automated, which reduces cost.
• Finer sand can be used, which results in a smoother surface finish.