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Selection of raw materials for cold iron in precision casting

To improve the water cooling rate of castings, the chill placed inside the mold cavity and on the surface during operation is called cold iron. In the production and manufacturing of precision castings, cold iron, pouring system software, and risers are often used in conjunction to manipulate the entire solidification process of castings and obtain qualified castings.

There are many raw materials that can be used to make cold iron, so metal materials and metal materials with higher thermal conductivity and heat storage index than sand mold raw materials can be used. Common cold iron raw materials in production and manufacturing include pig iron, aluminum alloy profiles, high-purity graphite, and alloy copper. The heat storage index of pig iron and cold iron is high, which can digest and absorb a large amount of heat, and has a strong ability to cool. Moreover, pig iron and cold iron are easy to produce and cost-effective, and are widely used in the production and manufacturing of aluminum alloy profiles and magnesium alloy precision castings. Especially when placed at the bottom or tail end of castings to enhance the solidification sequence of castings, pig iron and cold iron are usually used. In addition, aluminum cold iron is also widely used.