• Core sand
• Bentonite clay
• Pulverized coal
• Resin oil… See more

Cores are useful for features that cannot tolerate draft or to provide detail that cannot otherwise be integrated into a core-less casting or mold.
The main disadvantage is the additional cost to inco… See more

There are seven requirements for cores:
1. Green strength: In the green condition, there must be adequate strength for handling
2. In the hardened state, it must be strong enough to handle the forces of casting; the… See more

Many types of cores are available. The selection of the correct type of core depends on production quantity, production rate, required precision, required surface finish, and the type of metal being used. For example, c… See more

Special binders are introduced into core sands to add strength. The oldest binder was vegetable oil, however now synthetic oil is used, in conjunction with cereal or clay. The core is then baked in a convection oven between 20… See more

If Fub ≤0, no chaplet is used.
If Fub>0, chaplets is used.
As mentioned earlier, cores are usually supported by two core prints in the mold. However, there are situations where a core only uses o… See more

When casting a reentrant angle, instead of using a core a cheek can be used. This is a third segment in the flask, in addition to the cope and drag. This allows the entire mold to be made from green sand and from removable … See more