Identification of Effective Zones for High Pressure Coolant in Milling

Abstract Effective zones of high pressure coolant have been identified in milling performing a wide range of machining operations on ASSAB 718 mould steel using un-coated tungsten carbide inserts. The effects of high pressure coolant are evaluated in terms of machining parameters by comparing with those of conventional coolant and dry cut. Chipping and catastrophic failure are the dominant factors of insert rejection for dry cut and conventional coolant, whereas progressive flank wear is observed for high pressure coolant within its effective zones at lower depth of cut, lower feed rate and higher cutting speed. It is found that the cutting force is reduced, surface finish is improved, chip width is narrowed and cooling effect is better with the use of high pressure coolant.