CNC casting milling

    The starting iron-carbon alloy is obtained almost exclusively from the blast furnace today – it is the so-called pig iron containing 3-4.5% carbon. Pig iron remelted with iron or steel scrap and additives is called cast iron.CNC machining of cast iron depends largely on the amount and form of the graphite contained in them.
    Graphite inclusions in cast iron reduce friction between the tool and the workpiece on the one hand, and on the other hand break the basic metal structure. Thanks to this, in comparison with steel, they have better machinability, characterized by short chips, lower cutting forces and longer tool life. Milling cast iron gives a favorable chipping chip, but in turn it can be difficult to achieve the right surface smoothness.

    Cast iron CNC machining

    Gray cast iron is a popular, cheap construction material. Its strength properties are rather moderate. However, it has good foundry properties and very good machinability. CNC machining of cast iron produces small, easily removable chips. The dominant signs of wear when milling gray cast iron are flank wear and thermal cracks. The main problems associated with the workpiece are chipping on the miller’s exit side and surface finish problems. Dry milling and high speed vc are recommended.

    Ductile iron is one in which graphite occurs in the form of spheroidal aggregates in a pearlitic matrix containing some ferrite, or purely ferritic. Milling of this type of cast iron has machinability similar to low alloy steel. To obtain the best machining parameters, use PVD coated and wet machining grades.

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