Shellmoulding
Shellmoulding, also called shell mold casting, is a metal casting process in which a thin, rigid shell is formed from a mixture of silica sand and a thermosetting resin. The shell, about 0.8 to 1.2 mm thick, reproduces the pattern surface with high fidelity and serves as the mold insert.
To form the shell, resin-coated sand is applied around a heated pattern. The heat causes the binder
Shell molds yield excellent surface finish and dimensional accuracy, with good repeatability and relatively short cycle
Limitations include the need for specialized equipment and handling of hot shells, binder fumes, and higher
Developed in the mid-20th century as an improvement on conventional sand casting, shell molding has become