In sand casting, the cores used are generally the following:
(1) clay sand core
It is a simple core made of clay sand, which is relatively simple.
(2) oil sand core
It is a kind of core sand which is a dry oil or a semi-drying oil as a binder, and then a core is used. The application is relatively wide, but it is very low when it is just made, so it is Deformation is prone to occur during mold release, baking and handling. Moreover, the baking time is relatively long, so the energy consumption is relatively large.
(3) Resin sand core
It is a core made of resin, and its kind can be divided into three types: hot core box core, shell core core and cold core box core.