Nodular cast iron is mostly used in the box of all kinds of machine tools or the spindle box of cold pier machines. because the strength, plasticity, toughness, wear resistance, mechanical properties and elongation of ductile iron castings are higher than that of gray cast iron, the corrosion resistance of nodular cast iron is also higher than that of gray castings. so nodular cast iron is widely used in machine tools. 

1 lost foam casting process: the lost foam casting process has the characteristics of short production cycle and no tooling equipment, but there are also many defects in lost foam casting machine castings, such as large processing capacity, easy to produce casting defects such as stomata, sand holes, slag inclusion and so on. 

This casting process is mostly used for castings produced by a single piece of specification. 

2 Wood mold resin sand casting technology: the wood mold casting process has the advantages of small processing quantity, good surface and internal quality of castings, and not easy to produce casting defects, but it also has relative disadvantages, such as long production cycle and high mold cost. at the same time, it has to be equipped with the corresponding tooling equipment sandbox. 

This casting process is used for mass production of castings of the same specification. 

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