Influence of Nozzle Position during Cryogenic Milling of Ti-6Al-4V

Abstract

Ti-6Al-4V was machined by varying the nozzle position during external cryogenic CO2 cooling. The thermomechanical load was measured and the resulting surface morphology was characterized. The results show a significant influence of the nozzle position on the temperatures in the surface layer. Furthermore, a correlation between the temperatures and the microhardness inside the surface layer of the workpiece was found. This relationship was used to specify an optimal positioning of the nozzle in order to minimize the occurring temperatures.