what is mold core? In the metal casting industry, cores are indispensable.#aluminumcasting Why is it necessary to place additional material inside the mold during metal casting? This material is called a core. Numerous castings feature internal cavities, some with particularly complex internal structures such as intersecting passages and curved holes. Cores are required to occupy specific positions within the mold, thereby forming these intricate internal cavity structures.Cores are typically co