Explanation

A metal chill placed on the surface or cavity of a sand mold, sand core, or mold to control the solidification direction or local cooling rate of the casting. Placing chill can control the solidification sequence of castings, improve the feeding effect of feeder, reduce the porosity, shrinkage hole and cracks in the thick wall, refine the structure, and improve the hardness and wear resistance of castings. chill is divided into external chill and internal chill. The former plays a cooling role on the outside of the casting through the surface of the casting. During molding, it is placed on the surface of pattern or core box to form a part of sand mold cavity or core. The external cooling iron is not fused with the casting and can be reused after cleaning. The inner chill is a metal chill that is put into the mold cavity, surrounded by liquid metal after pouring and fused with the casting to become a part of the casting. The chilling effect of the internal chill is stronger than that of the external chill, and it is used when the effect of the external cold iron is insufficient at a particularly thick section or hot spot.

Classification