Introduction for Permanent Mold Casting

Permanent mold casting, also known as hard mold casting, is a casting method that involves pouring liquid metal into the metal mold to obtain castings. The mold is made of metal and can be reused multiple times. There are certain restrictions on the weight and shape of castings that can be produced by permanent mold casting, for example, Ferrous can only be castings with simple shape; The weight of the casting should not be too large; There are also limitations on wall thickness, and smaller castings cannot be produced.

Comparison between permanent mold casting and sand mold casting: There are many advantages in terms of technology and economy.

1.The mechanical properties of castings produced by metal mold are higher than those of sand mold castings.
2.The precision and surface finish of castings are higher than those of sand castings, and quality and size are stable.
3.The process yield of castings is high, and the consumption of liquid metal is reduced, which can generally save 15-30%.
4.Without or with minimal use of sand, it can generally save 80-100% of molding materials.

Although permanent mold casting has many advantages, it also has shortcomings. For example:

1.High cost of metal mold manufacturing
2.The metal mold is not breathable and has no deformability, which can easily cause defects such as insufficient pouring, cracking, or white spots in the cast iron.
3.When use metal mold to cast, the working temperature of the mold, the pouring temperature and speed of the alloy, the time the casting stays in the mold, and the coating used need to be strictly controlled.