Is CBN recommended for Cast Iron Milling also, if yes what are the benefits & its limitations?
Yes, CBN can be applied for finish milling of cast iron with BN Finish Mill & BN 600 Inserts. It can achieve a surface finish of Rmax 3.2 (Apx. Ra 0.8m) better flatness, good productivity & reduction in tool change time. Cylinder Block & head, Transmission case Machine-housing joining faces & machine bed is the ideal application for it. The conditions for BN Finish mill are speed 800~2000Mtr./min, absolute dry condition, & depth of cut less than 0.5mm. BNS800 (new solid CBN grade) inserts can be used for general milling of cast iron also for the conditions Speed800~2000mtr./min, depth of cut up to 4mm & federate 1.0mm/rev. max.
