How to choose cold iron raw materials in precision casting

How to choose cold iron raw materials in precision casting?

The furnace materials in precision casting processing and production mainly include pig iron, scrap steel, coke, limestone, molding sand and core sand. It mainly includes the transportation and sand mixing of raw sand, clay, coal powder, resin and other binders, curing agents, old sand, etc. Molding, core making, baking, melting, pouring, cooling, sand shaking, cleaning, post-processing and other processes. As far as the operation content is concerned, they are carried out amidst mechanical vibration and noise, and some are still working at high temperatures, such as melting and pouring, some produce pungent odors and dust, making the working environment even worse.

In order to improve the water cooling rate of castings, the cold objects placed in the mold cavity and on the working surface are called cold irons. In the production and manufacturing of precision castings, the cold iron, pouring system and risers often cooperate with each other to control the entire condensation process of the castings. , obtain qualified castings.

In the selection of cold iron raw materials, there are many raw materials that can be made into cold iron. Therefore, compared with sand mold raw materials, metal materials and metal materials with large thermal conductivity and large heat storage index can be used. Common cold iron raw materials in manufacturing include Pig iron, aluminum alloy profiles, high-purity graphite and alloy copper. Pig iron and cold iron have a large heat storage index, can digest and absorb more heat, and have strong cooling capabilities. In addition, pig iron and cold iron are easy to manufacture and low in cost. .They are used in the production and manufacturing of aluminum alloy profiles and magnesium alloy precision castings, especially when they are placed at the bottom or tail of the casting to improve the condensation sequence of the casting. In addition, aluminum refrigeration iron is also widely used.