What are the main functions of the core?

Function of the core: It is used to form the internal structure of the casting during the casting process. It is usually made of core sand mixed with raw sand and binder (water glass, resin, etc.). ) and made by hand or machine (such as core blowing machine, core shooting machine, etc.). ) In the core box.

The core box is made of wood or metal. Before casting, it is installed in the mold. After the molten metal is poured and solidified, it is removed when sand is produced, and a cavity can be formed in the casting. In order to increase the strength of the core, a skeleton made of iron wire or cast iron is usually placed in the core, which is called "core bone" (commonly known as "clay core bone" or "core iron"). In permanent mold casting, the core made of metal is usually pulled out in time after the metal solidifies.

Extended data

Rock core is divided into vertical rock core and horizontal rock core:

1, vertical core

Vertical cores generally have an upper core and a lower core, and short and thick cores may not have an upper core. The height of the core depends on the diameter d of the core, and the core should also have a certain inclination α. Generally, the dip angle of the lower core is smaller (5 ~ 10) and the height is higher to increase the stability of the core. The inclination of the upper core head should be large (6 ~ 15) and the height should be small to facilitate the closure of the container.

2. Horizontal rock core

Its length mainly depends on the core head diameter d and the core length. In order to facilitate the lower core and closing the box, the end of the core seat on the mold should also have a certain inclination A, and the cantilever core head must be long and large to balance the supporting core and prevent the core from sagging or being lifted by molten metal during closing the box.