This is a special type permanent mould casting in which hollow casting is prepared without core since solidification of molten metal starts from mould surface towards centre. The molten metal is kept inside the mould cavity for a pre-determined time for solidification of particular thickness and then the mould is turned down. The rest of the molten metal comes out from the mould. This is used for casting of ornaments, toys, hollow lamp stand, etc.
Leave a Reply