what is mould in casting

Quick Scoop: In casting, a mould is the hollow shape or cavity that gives the final object its form. Molten material is poured into it, then cooled or cured until it hardens into the desired shape.

What it does

A mould acts like a negative of the finished part, so whatever space is inside the mould becomes the shape of the cast item. It can be made from sand, metal, silicone, plaster, or ceramic, depending on the process and material being cast.

In metal casting

For metalwork, the mould holds molten metal and helps control cooling so the part solidifies correctly. In continuous steel casting, the mould is water- cooled and is used to form the first solid shell of the metal.

Simple example

If you pour liquid resin into a silicone mould shaped like a keychain, the mould creates the outline, and the cured resin becomes the finished keychain. That same idea applies to sand casting, die casting, and other casting methods.

Bottom line

So, mould in casting = the shaped container that forms the object. The cast material fills it, hardens, and takes its shape.