In order to improve the partial water cooling rate of castings, the chill placed inside the mold cavity and on the working surface is called chilled iron. In the production and manufacturing of precision castings, the cold iron, pouring system software and riser are used together to control the whole process of solidification of castings and obtain qualified castings.
The selection of cold iron raw materials can produce many cold iron raw materials. Therefore, 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 profile, high-purity graphite and alloy copper. Pig iron cold iron has a large heat storage index, can digest and absorb more heat, and has a strong chilling ability. Moreover, pig iron chill is easy to make and cheap in cost. It is used in the production and manufacturing of aluminum alloy profiles and magnesium alloy precision castings, especially when it is placed at the bottom or tail end of castings to improve the condensation sequence of castings. In addition, aluminum cold iron is also widely used.
