Experimental investigation of machinability in turning of ductile cast iron ggg-70 using minimum quantity lubrication technique

In this study, the effects of minimum amount of lubrication (MQL) conditions on machinability in turning, which are important operations of machining, have been investigated. In this context, the MQL is mixed with the nano-sized solid lubricant MoS2 and the GGG 70 spheroidal graphite cast iron is turned. Surface roughness, tool wear and chip geometry were investigated and the effects of nano-MoS2 on machinability were investigated. Shear tests were performed at a cutting speed of 350 m / min, a feed rate of 0.2 mm / s and a cutting depth of 4 mm. Surface roughness (Ra, Rz) values obtained in MQL conditions with dry cutting, conventional cooling, MQL and 3 different nano-MoS2 additions were investigated for cutting tool wear and chip formation. In MQL system, 3 different pressures and 2 different flow rates were determined. A number of statistical procedures such as variance analysis, Dunnet and Tukey test were performed to determine the relationship between Ra and Rz results and their relation to experimental parameters. The highest average Ra value was obtained under dry running conditions. In MQL conditions with normal spray, MQL and nano MoS2 addition, the roughness value is reduced. A reduction of 37% in R a and 39% in R z has been achieved according to dry processing conditions. The contribution of nano-MoS2 on tool wear has been positive. Keywords: MQL, Turning, Tool wear and surface roughness