OIL-ON-WATER MQL MACHINING OF NICKEL BASED SUPER ALLOY NIMONIC C.263

Increasing demand for gas turbines (air and automobile industry) resulted in need for materials resistant at elevated work temperatures. Use of these materials increases the utilization factor since input temperatures are higher. For these applications high dynamic strength materials and materials with small elongation at elevated temperatures are needed. Furthermore, these materials should be resistant on corrosion of exhaust gases. High strength at elevated temperatures classifies them in the group of hard-to-machine materials. Since machining of super alloys generates great deal of heat, it must be dissipated using large quantity of metal working fluids (MWFs). Cost of metal working fluids is increasing as the number and extent of environmental regulations increase. To decrease the impact on environment new machining techniques are developed. These techniques use minimal quantities of metal working fluids in quantities from 10 to 50 ml/h.Furthermore, there is no cost associated with treatment and disposal of MWFs, simply because there is nothing to dispose. It is well known that flood technique produces large quantity of waste which is classified as hazardous. This work deals with research of machinability of these super alloys using dry and semi-dry machining techniques, as environmental friendly techniques and as answer to the ever rising costs of production of machining operation with flooding of cutting zone.