Shell core molding is a foundry process used to create hollow cavities or cores within metal castings. In this process, a shell or core made of sand and a thermosetting resin is formed around a heated metal core box. The resin-coated sand mixture is blown into the core box cavity, where it cures and hardens to form the shell core. After curing, the shell core is removed from the core box, resulting in a hollow, shell-shaped structure. Shell cores are used to create internal features or cavities in castings, such as cooling passages in engine blocks or intricate shapes in automotive components. This method offers advantages such as dimensional accuracy, high surface finish, and improved casting quality compared to traditional core molding techniques.