THE EFFECT OF OIL-MIST APPLICATION ON THE MACHINABILITY IN TURNING OF SUPER HEAT-RESISTANT ALLOY INCONEL 718 ( IN CASE OF USING CERMET AND COATED CARBIDE INSERTS )

摘要

Recently, the realization of cutting operations without using a coolant at work-sites has become an important research subject in the field of eco-cutting. The purpose of the present study is to clarify the possibility of developing an eco-cutting process for the high speed machining of the super heat-resistant alloy Inconel 718 which usually needs a high volume of coolant during machining. A dry cutting and a wet cutting with an emulsion coolant as well as an oil-mist cutting were evaluated in this study. A Ti compound cermet insert, a TiCN-Al_2O_3-Ti compound CVD coated cemented carbide insert and a (Ti, Al)N PVD coated cemented carbide insert were used for the turning of the periphery of round bars. It was found that Inconel 718 as a low machinability material can be machined at a cutting speed of 100m/min using a combination of the (Ti, Al)N PVD coated carbide insert and vegetable oil mist 12ml/h with 0.5MPa air.