Core (manufacturing)
（重定向自Coremaking）
![Green-sand cores](/Images/godic/202501/06/Green_sand_cores.svg2858.png")
![A diagram of chaplet usage](/Images/godic/202501/06/Chaplets.svg2858.png")
![Various types of chaplets.](/Images/godic/202501/06/Types_of_chaplets2858.png")
![A cheek used to create a pulley](/Images/godic/202501/06/Casting_cheek.svg2858.png")
A core is a device used in casting and molding processes to produce internal cavities and reentrant angles. The core is normally a disposable item that is destroyed to get it out of the piece. They are most commonly used in sand casting, but are also used in injection molding.