Precision casting is a process in which a metal is melted into a liquid that meets certain requirements and poured into the casting mold.Because the casting blank is almost formed, the cost is reduced and the time is reduced to some extent.Casting is one of the basic processes of modern manufacturing industry.

Precision casting is a relatively economical method of blank forming, which can show its economy for complicated parts.Such as car engine block and head, ship propeller and exquisite art and so on.Some parts that are difficult to cut, such as nickel-based alloy parts of a gas turbine, cannot be formed without casting.

In addition, the size and weight of cast parts can be adapted to a wide range of metal types almost unlimited;Parts in the general mechanical performance, but also have wear resistance, corrosion resistance, shock absorption and other comprehensive performance, is the other metal forming methods such as forging, rolling, welding, punching can not be done.Therefore, the number and tonnage of blank parts produced by casting in the machine manufacturing industry is still the largest.

There are many kinds of casting, which are customarily divided into:

1. Ordinary sand mould casting, including wet sand mould, dry sand mould and chemically hardened sand mould.

2. Special casting, press molding materials and can be divided into natural mineral sand as the main special casting molding materials (e.g., investment casting, mold casting, shell mold casting foundry, negative pressure casting, mold casting, ceramic mold casting, etc.) and metal as the main mold material of special casting (such as metal mold casting, pressure casting, continuous casting, low pressure casting, centrifugal casting, etc.) two kinds of casting production have different characteristics with other technology, wide adaptability, more materials and equipment will be needed, pollute the environment.Casting production will produce dust, harmful gas and noise pollution to the environment, compared with other machinery manufacturing process is more serious, need to take measures to control.

As modern society to the requirement of energy saving and environmental protection to nature calls for more and more high, the trend of the development of the casting products more tend to the comprehensive performance of castings, higher precision, less allowance and more bright and clean surface, so the new casting alloy will be development, new equipment, new technology is expected to appear in the corresponding precision casting gradually into the line of sight of people, precision casting, relative to the traditional foundry industry is more accurate shape and high precision casting.