Casting Practice Test: Core and Core Making — Flashcards

Core and Core Making topics include: Core functions, finishing cores, cores types and settings, making and baking of cores, dielectric core bakers and core application.

Core making is the process of creating cores, which are forms used to construct the interior shape of a casting. Cores are usually made of sand and placed in a mold cavity to create the interior surfaces of castings. The void space between the core and mold-cavity surface eventually becomes the casting. 

Here are some types of cores:
Hanging core: Hangs along the cope without any support in the drag side of the mold. Hanging cores are supported by wire or rod.
Horizontal core: The most common type of core, positioned horizontally at the parting surface of the mold. The ends of the core rest in the seats provided by the core prints on the pattern.
Balanced core: Supported only at one side in the mold. The balanced core is also a horizontal core along the parting line axis. 

Here are some other core making steps:
Core boxes: A core box is the tooling used to build the core.
Reinforcement of cores: Some cores, heavy & large cores in particular, might need additional reinforcement material like cast iron grids or low-carbon steel wires to maintain coherence.
Tempering of core boxes: In certain core manufacturing processes, such as hot box and Croning, the hardening of the core is accomplished through a thermal reaction of the binder in a heated core box.