• Core sand
• Bentonite clay
• Pulverized coal
• Resin oil 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 … 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 one core print so other means are required … 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 … See more

There are seven requirements for cores:
1. Green strength: In the green condition, there must be adequate strength for handling 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 200 and 250 °C (392 and 482 °F). … 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 … See more